JP6314571B2 - Reaction force generator - Google Patents

Description

  The present invention relates to a reaction force generation device in which a reaction force generation member having a dome portion that generates a reaction force due to elastic deformation with respect to operation of an operation element is fixed on a support member.

  Conventionally, a keyboard instrument such as an electronic organ or an electronic piano has been provided with a reaction force generating member having a dome portion (rubber dome) made of an elastic body for applying a reaction force to a key pressing operation. is there. For example, in Patent Document 1 below, a dome that is formed in a dome shape and is elastically deformed by pressing in the axial direction to generate a reaction force corresponding to the amount of elastic deformation is connected to the lower end of the dome, and is outside. A key frame that supports a key so that the key can be swung upwardly by a reaction force generating member in which a base portion extending in a plate shape and a leg portion protruding in a rod shape from the lower surface of the base portion are integrally formed by an elastic body A keyboard device fixed on the shelf is shown. In this keyboard device, a through hole is provided in a flat plate-like support member (substrate) fixed on the key frame, and the reaction force generating member is fixed to the support member by fitting the leg portion into the through hole. ing.

JP 2007-25576 A

  In the prior art, only the reaction force generating member is fixed to the support member by inserting the leg portion into the through hole, but there is no detailed description thereof. However, as inferred from the drawings, the through hole has a cylindrical shape in which the shape of the cross section perpendicular to the axis is circular and the diameter of the circle is constant along the axis from the upper surface to the lower surface of the support member. In addition, the leg portion has a circular cross-sectional shape orthogonal to the axis, and the outer peripheral surface is inclined with respect to the direction of the axis and gradually becomes thinner toward the tip. Then, the reaction force generating member is fixed on the support member by allowing the leg portion to enter the through hole and bringing the outer peripheral surface of the base portion near the lower surface of the base portion of the leg portion into contact with the upper end portion of the through hole. Therefore, according to this prior art, when the leg portion enters the through hole, the interference between the outer peripheral surface of the leg portion and the inner side surface of the through hole is reduced, and the leg portion smoothly enters the through hole. I can. However, in such a configuration of the through hole and the leg of the prior art, the outer peripheral surface of the leg is inclined radially outward toward the lower surface of the base, so that the reaction force generating member is fixed to the support member. When the leg portion is caused to enter the through hole, the base portion of the leg portion extends outward in the radial direction. Therefore, it is difficult to make the lower surface of the base portion adhere to the upper surface of the support member. In addition, after the reaction force generating member is fixed to the support member, the force that the base of the deformed leg portion returns to the original shape also acts in the direction of pushing out the leg portion from the through hole, so that the lower surface of the base portion is supported. Easily separated from the upper surface of the member. As a result, according to this prior art, the reaction force generating member has a problem that the lower surface of the base portion is brought into close contact with the upper surface of the supporting member, and is not stably fixed to the supporting member.

  The present invention has been made in order to cope with such a problem. The purpose of the present invention is to allow the leg portion of the reaction force generating member to smoothly enter the through hole provided in the support member and to generate the reaction force. An object of the present invention is to provide a reaction force generator capable of stably fixing a member on a support member by bringing a lower surface of a base portion into close contact with an upper surface of the support member. In the description of each constituent element of the present invention below, the reference numerals of corresponding portions of the embodiment are shown in parentheses in order to facilitate understanding of the present invention. The present invention should not be construed as being limited to the configurations of the corresponding portions indicated by the reference numerals of the forms.

In order to achieve the above-described object, the feature of the present invention is that it is integrally formed of an elastic body and has a radial length from one end portion in the axial direction (Yw, Yb) toward the other end portion in the axial direction. A dome portion (21w1) that is gradually increased and is formed in a dome shape by opening the other end portion in the axial direction, and elastically deforms by pressing in the axial direction to generate a reaction force corresponding to the amount of elastic deformation. 21b1), a base portion (21-3, 21-3w, 21-3b) connected to the other end portion of the dome portion and extending outwardly and having a surface opposite to the dome portion formed in a plane, and a base Keeping the shape and size of the cross section parallel to the surface on the opposite side of the dome part of the part from the surface on the opposite side to the dome part of the base part (Yk) while maintaining the same shape and size along the axis for a predetermined length Columnar legs (21-4, 21-4) extending in parallel to the axial direction of the dome , 21-4b) and a reaction force generating member (21, 21w, 21b), and a through hole penetrating from the installation surface to the other surface with an installation surface on which the surface opposite to the dome portion of the base portion is installed (31d1 to 31d3, 31d1 ′ to 31d3 ′, 31d1 ″ to 31d3 ″) and a support member (31d, 31d ′, 31d ″, 31dw, 31db) having a flat installation surface, and a leg portion. A reaction force generating device that allows a reaction force generating member to be fixed to a support member by intruding into a through-hole and bringing a surface opposite to the dome portion of the base portion into close contact with the installation surface, From the position where the outer peripheral surface in a part in the central direction is brought into contact with the inner surface of the through hole to fix the reaction force generating member to the support member, and at least a part of the inner surface of the through hole is in contact with the outer peripheral surface of the leg portion Radial direction from the axial direction of the leg (Yk) A through hole at a position in contact with a part of the outer peripheral surface in the axial direction of the leg portion in a state before the leg portion is inserted into the through hole so as to be inclined and extended outward. The inner diameter of the leg portion is made smaller than the outer diameter of a part of the outer peripheral surface in the axial direction of the leg portion, and when the reaction force generating member is assembled to the support member, it contacts the inner side surface of the through hole in the leg portion. The leg portion is held in the through hole by the deformation of the portion to be performed .

In this case , the position in contact with the outer peripheral surface of the leg is an installation surface position of the support member, a surface position opposite to the installation surface of the support member, or an intermediate position between the installation surface and the opposite surface. Good. Also, the dome portion is pressed in the axial direction by, for example, a key operation on a keyboard instrument, and gradually elastically deforms from the start of pressing, gradually increasing the reaction force as the amount of elastic deformation increases, and the reaction force peaks. After reaching the point, it buckles and deforms, and the reaction force is rapidly reduced.

  Furthermore, one dome portion may be formed integrally with the base portion, but a plurality of dome portions may be formed integrally with the base portion. In this case, the plurality of dome portions respectively correspond to the plurality of keys of the keyboard instrument, and the axial directions are the same. In addition, one leg may be formed integrally with the base, but a plurality of legs may be formed integrally with the base. In this case, the axial direction of the plurality of dome parts is the same direction parallel to the axial direction of the dome part.

  In the present invention configured as described above, at least a part of the inner side surface of the through hole extends from the position in contact with the outer peripheral surface of the leg portion so as to be inclined more radially outward than the axial direction of the leg portion. Yes. Therefore, the shape and size of the cross section parallel to the surface of the base portion opposite to the dome portion are kept the same along the axis, and the axis from the surface opposite to the dome portion of the base portion is adjusted to the axis of the dome portion. Even when extending in parallel with the central direction, in other words, even when the shape and size of the cross section perpendicular to the axis of the leg is the same along the axis, when the leg is to enter the through hole, Contact (interference) over a long distance (ie large area) between the outer peripheral surface of the leg and the inner peripheral surface of the through hole can be avoided, and the leg can be smoothly inserted into the through hole provided in the support member. Become. In the present invention, in a state where the reaction force generating member is fixed to the support member, the inner surface of the through hole contacts the outer peripheral surface of a part of the leg portion in the axial direction. Fixed to. In this case, the shape and size of the cross section perpendicular to the axis of the leg are the same along the axis, and the outer peripheral surface of the leg contacting the inner surface of the through hole is mainly in the radial direction of the leg. Deform. Therefore, the deformation of the leg portion does not adversely affect the adhesion of the surface of the base portion opposite to the dome portion to the installation surface of the support member, and the surface of the base portion opposite to the dome portion does not affect the installation surface of the support member. Easy to adhere to. In addition, after fixing the reaction force generating member to the support member, the force that the part of the leg portion that is in contact with the inner surface of the through hole returns to the original shape acts on the outer side in the radial direction of the leg portion. The close contact between the surface of the base portion opposite to the dome portion and the installation surface of the support member is stably maintained. As a result, according to the present invention, the reaction force generating member can be easily assembled to the support member while the plane opposite to the dome portion of the base portion is brought into close contact with the installation surface of the support member, and is stably fixed. can do.

  Another feature of the present invention resides in that a part of the inner side surface of the through hole is extended in the axial direction of the leg portion from a position in contact with the outer peripheral surface of the leg portion. According to this, the leg portion is inserted into the through hole while the outer peripheral surface of the leg portion facing the part of the inner surface is brought into contact with a part of the inner surface of the through hole extending in the axial direction of the leg portion. If it is made to penetrate | invade, the penetration | invasion direction to the through-hole of a leg part will become exact. As a result, according to another feature of the present invention, the reaction force generating member can be easily and stably assembled to the support member by bringing the plane opposite to the dome portion of the base portion into close contact with the installation surface of the support member. it can.

  Another feature of the present invention is that the position in contact with the outer peripheral surface of the leg is a surface position on the opposite side to the installation surface of the support member or a position in the vicinity of the surface position on the opposite side. An engaging portion (21-4a) that projects outwardly from the center portion in the center direction and engages with the support member at a surface position opposite to the installation surface of the support member or in the vicinity of the surface position on the opposite side. ). In this case, for example, on the outer peripheral surface, the engaging portion comes into contact with and engages with the support member on one plane (Kp). According to this, after the reaction force generation member is assembled to the support member, the engagement portion prevents the leg portion from coming out of the through hole, so that the reaction force generation member is stably and reliably attached to the support member. It becomes fixed.

  Another feature of the present invention is that the one plane is parallel to a surface of the base opposite to the dome portion. In this case, for example, the engaging portion is brought into contact with and engaged with the support member at the other surface position of the support member on the outer peripheral surface. Further, a notch (31d5 to 31d7) may be provided around the through hole on the other surface of the support member, and the engaging portion may be brought into contact with and engaged with the notch of the support member on the outer peripheral surface. According to this, even if an engaging part is provided in a leg part, the plate | board thickness of a support member can be made uniform and a support member can be easily manufactured now.

1 is a schematic side view of a keyboard device according to a first embodiment of the present invention. It is a schematic plan view of the keyboard apparatus of FIG. It is an enlarged vertical sectional view of the reaction force generator concerning a 1st embodiment of the present invention. (A)-(C) are longitudinal cross-sectional views which show the penetration | invasion state to the through-hole of the leg part in the reaction force generator which concerns on the modification 1-3 of the said 1st Embodiment. It is an expansion longitudinal cross-sectional view of the reaction force generator which concerns on 2nd Embodiment of this invention. (A)-(C) are longitudinal cross-sectional views which show the penetration | invasion state to the through-hole of the leg part in the reaction force generator which concerns on the modification 1-3 of the said 2nd Embodiment. It is an expanded longitudinal cross-sectional view of the reaction force generator which concerns on 3rd Embodiment of this invention. (A)-(C) are longitudinal cross-sectional views which show the penetration | invasion state to the through-hole of the leg part in the reaction force generator which concerns on the modification 1-3 of the said 3rd Embodiment. It is an expanded longitudinal cross-sectional view of the reaction force generator which concerns on 4th Embodiment of this invention. It is an expanded longitudinal cross-sectional view of the reaction force generator which concerns on 5th Embodiment of this invention. It is an expanded longitudinal cross-sectional view of the reaction force generator which concerns on 6th Embodiment of this invention. It is an expanded longitudinal cross-sectional view of the reaction force generator which concerns on 7th Embodiment of this invention. It is an expanded longitudinal cross-sectional view of the reaction force generator which concerns on 8th Embodiment of this invention. It is an expanded longitudinal cross-sectional view of the reaction force generator which concerns on 9th Embodiment of this invention. It is an expanded longitudinal cross-sectional view of the reaction force generator which concerns on 10th Embodiment of this invention. It is an expanded longitudinal cross-sectional view of the reaction force generator which concerns on 11th Embodiment of this invention. It is an expanded longitudinal cross-sectional view of the reaction force generator which concerns on 12th Embodiment of this invention. (A) is a longitudinal cross-sectional view of the reaction force generator according to the thirteenth embodiment of the present invention, and (B) is an enlarged view of the tip of the leg portion of the reaction force generator of (A). (A) is a longitudinal cross-sectional view of the reaction force generator according to Modification 1 of the thirteenth embodiment, and (B) is an enlarged view of the distal end portion of the leg of the reaction force generator of (A). (A) is a longitudinal cross-sectional view of the reaction force generator according to Modification 2 of the thirteenth embodiment, and (B) is an enlarged view of the distal end portion of the leg portion of the reaction force generator of (A). It is a longitudinal cross-sectional view which shows the penetration | invasion state to the through-hole of the leg part in the reaction force generator which concerns on the modification 3 of the said 13th Embodiment. It is a schematic side view of the keyboard apparatus according to the fourteenth embodiment of the present invention. It is a schematic plan view of the keyboard apparatus of FIG. (A) is a longitudinal cross-sectional view which shows the penetration | invasion state to the through-hole of the leg part in the reaction force generator which concerns on the modification which changed the leg part, (B) is along the BB line of (A). It is the cross-sectional view which was seen, (C) is a cross-sectional view corresponding to (B) of the leg part in the reaction force generator which concerns on the other modification which changed the leg part.

a. First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view of the keyboard device according to the first embodiment viewed from the right, and FIG. 2 is a schematic plan view of the keyboard device. In FIG. 1, the front-back direction of the keyboard device is the left-right direction, and the up-down direction of the keyboard device is the up-down direction. In the present specification, the left side of FIGS. 1 and 2 will be described as the front side and the right side as the rear side, and the vertical direction of FIG. 2 will be described as the horizontal direction (left and right direction).

  This keyboard device includes a plurality of white keys 11w and a plurality of black keys 11b that are pressed and released by the performer. The white key 11w is formed in an elongated shape in the front-rear direction and is formed in a U-shaped cross section with the lower part opened, and is disposed on the flat plate upper plate portion 31a of the key frame 31. The key frame 31 is molded from a synthetic resin using a mold. However, the key frame 31 may be integrally molded as a whole, or a plurality of molded parts may be combined. The key frame 31 includes flat leg portions 31b and 31c extending downward from the front end and the rear end of the upper plate portion 31a, and a frame FR provided in the musical instrument at the lower end portions of the leg portions 31b and 31c. It is fixed on the top. On the upper surface of the rear part just before the rear end of the upper plate part 31a of the key frame 31, a pair of plate-like key support parts 32w for the white key 11w opposed to the inside of the white key 11w are fixed upright. ing. The upper part of the key support part 32w is provided with protrusions that protrude outward at positions facing each other, and the protrusions enter into the through holes provided at the rear ends of both sides of the white key 11w so as to be rotatable from the inside. I am letting. Thereby, the white key 11w is supported by the key support portion 32w so as to be swingable, and the front end portion is displaced in the vertical direction. In the following description, the swing center of the white key 11w is defined as a swing axis Cw.

  The black key 11b is different in the shape in which the front upper surface is raised, but the other configuration is the same as the white key 11w, and is arranged on the flat plate-like upper plate portion 31a of the key frame 31. On the upper surface of the rear end portion of the upper plate portion 31a of the key frame 31, a key support portion 32b for a pair of plate-like black keys 11b facing inside the black key 11b is erected and fixed. The upper part of the key support part 32b is also provided with a protruding part that protrudes outward at a position facing each other, and the protruding part penetrates into a through hole provided at the rear end part on both sides of the black key 11b so as to be rotatable from the inside. I am letting. Thereby, the black key 11b is supported by the key support portion 32b so as to be swingable, and the front end portion is displaced in the vertical direction. In the following description, the center of swing of the black key 11b is defined as a swing axis Cb. As will be described in detail later, the key support portion 32b is more than the key support portion 32w so that the dome portions 21w1, 21b1 of the reaction force generating member 21 perform the same operation when the white key 11w and the black key 11b are pressed. The swing shaft Cb is positioned rearward of the swing shaft Cw.

  On the upper surface of the upper plate portion 31a of the key frame 31, a key guide 33w is erected at a position below the front end of the white key 11w, and the key guide 33b is erected at a position below the front end of the black key 11b. Has been established. The key guides 33w and 33b are slidably inserted into the white key 11w and the black key 11b, respectively, and the white key 11w and the black key 11b are not displaced in the left-right direction when they are swung in the up-down direction. ing.

  A reaction force generating member 21 that applies a reaction force to the key pressing operation of the white key 11w and the black key 11b is provided below the central part in the front-rear direction of the white key 11w and the black key 11b. The reaction force generating member 21 includes a plurality of dome portions 21w1, 21b1, a plurality of top portions 21w2, 21b2, a base portion 21-3, and a plurality of leg portions 21-4, and is integrally formed of elastic rubber. The reaction force generating member 21 has a leg portion 21-4 penetrating through a support portion 31d provided to be inclined to the upper plate portion 31a of the key frame 31, and the lower surface of the base portion 21-3 is in close contact with the upper surface of the support portion 31d. Let it be fixed. The lower surface of the white key 11w and the black key 11b has a flat plate shape that presses the top portions 21w2 and 21b2 from above at a position opposite to the upper surfaces of the plurality of top portions 21w2 and 21b2 of the reaction force generating member 21. Pressing portions 11w1 and 11b1 are provided. The lower surfaces of the pressing portions 11w1 and 11b1 may not be flat but may be spherical. Further, the pressing portions 11w1 and 11b1 may be configured by cross-shaped or H-shaped ribs or the like protruding downward from the inner upper surfaces of the white key 11w and the black key 11b.

  The keyboard device is incorporated between the white key 11w and the black key 11b and the upper plate portion 31a of the key frame 31 at an intermediate position between the pressing portions 11w1 and 11b1 and the key support portions 32w and 32b. A spring 34w for the white key 11w and a spring 34b for the black key 11b are provided. The springs 34w and 34b urge the white key 11w and the black key 11b upward with respect to the upper plate portion 31a. The springs 34w and 34b may be springs such as leaf springs as long as the white key 11w and the black key 11b can be urged upward without being coiled.

  The white key 11w includes an extending portion 11w2 extending downward from the front end portion thereof, and an engaging portion 11w3 protruding forward is provided at the lower end of the extending portion 11w2, and the engaging portion 11w3 is a key frame. Through the through hole provided in the upper plate portion 31a of 31, the lower part of the upper plate portion 31a is entered from above. Further, an upper limit stopper member 35 w is provided on the lower surface of the front end portion of the upper plate portion 31 a of the key frame 31. The upper limit stopper member 35w is composed of a cushioning member such as a felt, and restricts the upward displacement of the front end portion of the white key 11w by contacting the engaging portion 11w3 of the white key 11w. A lower limit stopper member 36 w is provided on the upper surface of the front end portion of the upper plate portion 31 a of the key frame 31. The lower limit stopper member 36w is also composed of a cushioning member such as felt, and restricts the downward displacement of the front end portion of the white key 11w by contacting the lower surface of the front end portion of the white key 11w.

  The black key 11b is provided with an extending portion 11b2 extending downward from the front end portion thereof, and an engaging portion 11b3 protruding backward is provided at the lower end of the extending portion 11b2, and the engaging portion 11b3 is a key frame. Through the through hole provided in the upper plate portion 31a of 31, the lower part of the upper plate portion 31a is entered from above. An upper limit stopper member 35 b is provided on the lower surface of the intermediate portion of the upper plate portion 31 a of the key frame 31. The upper limit stopper member 35b is also composed of a cushioning member such as a felt, and restricts the upward displacement of the front end portion of the black key 11b by contact with the engaging portion 11b3 of the black key 11b. A lower limit stopper member 36b is provided on the upper surface of the intermediate portion of the upper plate portion 31a of the key frame 31. The lower limit stopper member 36b is also composed of a cushioning member such as a felt, and restricts the downward displacement of the front end portion of the black key 11b by contacting the lower surface of the front end portion of the black key 11b.

  An electric circuit board 37 is fixed to the lower surface of the upper plate portion 31a of the key frame 31 and slightly behind the reaction force generating member 21 so as to be parallel to the upper plate portion 31a. On the upper surface of the electric circuit board 37, dome-shaped key switches 38w and 38b for the white key 11w and the black key 11b are fixed, respectively. When the white key 11w and the black key 11b are depressed, the key switches 38w and 38b are pressed by the projecting portions projecting from the lower surfaces of the white key 11w and the black key 11b to change from the off state to the on state. 11w and black key 11b are detected. The detection of the key release operation by the key switches 38w and 38b is used for the generation control of the musical tone signal.

  Next, the reaction force generating member 21 and its peripheral members will be described in detail using the longitudinal sectional view of FIG. As described above, the reaction force generating member 21 includes a plurality of dome portions 21w1, 21b1, a plurality of top portions 21w2, 21b2, a base portion 21-3, and a plurality of leg portions 21-4, and is integrated with elastic rubber. Molded.

  The plurality of dome portions 21w1 and the top portion 21w2 are respectively pressed by the pressing portion 11w1 when the white key 11w is pressed, and respectively apply reaction force to the key pressing operation of the plurality of white keys 11w. The plurality of dome portions 21b1 and the top portion 21b2 are respectively pressed by the pressing portion 11b1 when the black key 11b is pressed, and respectively apply reaction force to the key pressing operation of the plurality of black keys 11b. The plurality of dome portions 21w1 and the top portion 21w2, and the plurality of dome portions 21b1 and the top portion 21b2 have the same shape and size, respectively, and the base portion 21-3 in a row in the horizontal direction at the same position in the front-rear direction. Arranged above (see FIG. 2).

  The dome portions 21w1 and 21b1 are thin-walled portions that are gradually deformed by pressing from above by gradually increasing the diameters (radial lengths) around the axial centers Yw and Yb from the top to the bottom. Each is formed in a dome shape, and the lower end is opened circularly. The cross-sectional shapes orthogonal to the axial centers Yw and Yb of the dome portions 21w1 and 21b1 are circular. The dome portions 21w1, 21b1 are elastically deformed by increasing the pressing force from above to gradually increase the reaction force, and after the reaction force reaches its peak, the reaction force is rapidly decreased by buckling deformation. Let me. The top portions 21w2 and 21b2 are respectively formed in a cylindrical shape with an open top surface, and are connected to the top surfaces of the dome portions 21w1 and 21b1 on the bottom surface. The top portions 21w2 and 21b2 are set to have a uniform height over the entire circumference, and the upper surface thereof is a flat surface. The axial centers of the top portions 21w2 and 21b2 are the same as the axial centers Yw and Yb of the dome portions 21w1 and 21b1, and the normals of the top surfaces of the top portions 21w2 and 21b2 are parallel to the directions of the axial centers Yw and Yb, respectively. The top portions 21w2 and 21b2 are hardly deformed even when pressed from above.

  The axial center Yw of the dome part 21w1 and the top part 21w2 and the axial center Yb of the dome part 21b1 and the top part 21b2 are parallel, and the upper parts thereof are slightly inclined so as to be positioned forward. The directions of these axial centers Yw and Yb coincide with the pressing directions by the pressing portions 11w1 and 11b1 of the white key 11w and the black key 11b when the reaction force by the dome portions 21w1 and 21b1 reaches a peak. . And press part 11w1, 11b1 is formed so that the normal line of the lower surface (pressing surface) of press part 11w1, 11b1 may become parallel to axial center Yw, Yb at the time of reaction force peak. These pressing directions are the same as the rotation direction around the rocking axis Cw of the pressing portion 11w1 of the white key 11w and the rotation direction around the rocking axis Cb of the pressing portion 11b1 of the black key 11b. On the other hand, in the performance, the downward displacement amount of the front end of the white key 11w when the white key 11w is depressed and the downward displacement amount of the front end of the black key 11b when the black key 11b is depressed are substantially equal. There is a need. Since the front end of the black key 11b is located behind the front end of the white key 11w, as described above, the rocking shaft Cb of the black key 11b is located behind the rocking shaft Cw of the white key 11w. ing.

  In other words, the dome portions 21w1 and 21b1 are arranged in a row in the horizontal direction at the same position in the front-rear direction under the condition that the amount of downward displacement of the front ends of the white key 11w and the black key 11b is substantially equal when the key is pressed. In addition, the axial centers Yw and Yb are set in the same direction, and the pressing direction by the pressing portions 11w1 and 11b1 at the reaction force peak of the dome portions 21w1 and 21b1 (that is, around the swing axes Cw and Cb of the pressing portions 11w1 and 11b1). In order to coincide with the rotation direction), the front and rear positions of the swing axes Cw and Cb of the white key 11w and the black key 11b are set. However, the lower surface position of the pressing portion 11w1 of the white key 11w is slightly higher than the lower surface position of the pressing portion 11b1 of the black key 11b. Instead of changing the lower surface positions of the pressing portions 11w1 and 11b1, the length in the direction of the axis Yw of the top portion 21w2 for the white key 11w is set to the length of the axis Yb of the top portion 21b2 for the black key 11b. You may make it make it a little longer than the length of a direction.

  The base portion 21-3 is continuously connected to the lower surfaces of the dome portions 21w1, 21b1, and extends in a plate shape outward from the lower ends of the dome portions 21w1, 21b1. The base portion 21-3 has a rectangular shape that is long in the horizontal direction in plan view (see FIG. 2), and is formed thick in the vertical direction. It is a trapezoid made thicker than the edges. The upper surface and the lower surface of the base portion 21-3 are also flat, and the upper surfaces are orthogonal to the axial centers Yw and Yb of the dome portions 21w1 and 21b1, and the upper inner surfaces and the top portions 21w2 and 21b2 of the dome portions 21w1 and 21b1. Parallel to the top surface. The lower surface of the base portion 21-3 is in close contact with the upper surface of the support portion 31d when the reaction force generating member 21 is assembled and fixed to the support portion 31d. In this case, the angle θp1 with respect to the upper surface of the lower surface of the base portion 21-3, that is, the angle θp1 formed by the lower surface of the base portion 21-3 and the plane perpendicular to the axial centers Yw and Yb of the dome portions 21w1 and 21b1 is This is equal to an angle θp2 formed by the centers Yw and Yb and the thickness direction Dp of the support portion 31d. In the first embodiment, the support portion 31d is a flat plate having a uniform thickness, the upper surface and the lower surface thereof are parallel, and the plate thickness direction Dp is a direction orthogonal to the upper surface and the lower surface of the support portion 31d. In addition, P1 of FIG. 3 has shown the plane parallel to the upper surface of the base part 21-3, ie, a plane orthogonal to the axial centers Yw and Yb.

  A plurality of leg portions 21-4 are integrally formed on the lower surface of the base portion 21-3. The plurality of leg portions 21-4 protrude downward in a cylindrical shape from appropriate locations on the lower surface of the base portion 21-3, and the diameter of the tip portion is gradually reduced. The outer diameter around the axis Yk of the portion other than the tip of the leg 21-4 is the same. In other words, the shape and size of the cross section orthogonal to the axis Yk of the leg 21-4 is the same as the surface of the base 21-3 opposite to the dome 21w1, 21b1 (the bottom of the base 21-3). ) It is the same along the axis Yk except in the vicinity and the tip. That is, the shape and size of the cross section perpendicular to the axis Yk of the leg 21-4 are the same over a predetermined length along the axis Yk. And the leg part 21-4 keeps the shape and magnitude | size of a cross section parallel to the lower surface of the base part 21-3 over the predetermined length along the axial center Yk, and maintains the base part 21- The axis Yk is extended from the lower surface of 3 in parallel with the axes Yw and Yk of the dome portions 21w1 and 21b1. In addition, the shape of a cross section parallel to the lower surface of the base portion 21-3 is an ellipse. The directions of the axis Yk of the plurality of leg portions 21-4 are the same, and both are parallel to the axis Yw, Yb of the dome portions 21w1, 21b1 and the top portions 21w2, 21b2. Thus, when the reaction force generating member 21 is formed using a mold, the reaction force generating member 21 is easily formed without forcibly removing the thin leg portions 21-4 and the thin dome portions 21w1, 21b1. it can.

  The reaction force generation member 21 is placed on the support portion 31d by inserting the plurality of legs 21-4 of the reaction force generation member 21 configured as described above into the plurality of through holes 31d1 provided in the support portion 31d and press-fitting them. It is fixed to. The through hole 31d1 is a hole that penetrates the support portion 31d. The through hole 31d1 will be specifically described. The shape of the through hole 31d1 at the lower surface position of the support portion 31d (that is, the protruding side position of the leg portion 21-4) is a circle centering on the axis Yk of the leg portion 21-4. The inner diameter is slightly smaller than the outer diameter of the columnar portion of the leg 21-4. The shape of the through hole 31d1 at the upper surface position of the support portion 31d (that is, the position on the entry side of the leg portion 21-4) is also circular, but the inner diameter thereof is larger than the inner diameter of the lower surface position, and the center thereof is the leg portion 21. -4 is different from the axis Yk. The inner side surface of the through hole 31d1 is formed in a truncated cone shape whose inner diameter becomes smaller from the upper side toward the lower side.

  The inclination angle of the inner surface of the through hole 31d1 is set as follows. In this case, a straight line in the plate thickness direction Dp passing through the center position of the through hole 31d1 on the lower surface of the support portion 31d (that is, the planar position where the leg portion 21-4 contacts the inner peripheral surface of the through hole 31d1 over the entire circumference). Is Lp. Note that that the leg portion 21-4 contacts the inner peripheral surface of the through hole 31d1 over the entire circumference means that the outer peripheral surface of the leg portion 21-4 contacts the inner peripheral surface of the through hole 31d1. This description is also used in other embodiments. Further, the angle θp3 is defined by the axis Yk of the leg 21-4 and the straight line Lp. In this case, since the axis Yk of the leg 21-4 is parallel to the axes Yw and Yb of the dome portions 21w1 and 21b1, and the straight line Lp is the same as the plate thickness direction Dp, the angle θp3 is the angle θp1 described above. , Θp2 respectively.

  Here, a plane including the axis Yk and the straight line Lp is assumed. Of the pair of inner side surfaces (that is, a pair of straight lines) where the assumed plane and the inner side surface of the through hole 31d1 intersect, the axis Yk is above the lower surface of the support portion 31d with respect to the straight line Lp. The inner side surface (the inner side surface on the right side in the figure) on the inclined side is defined as In1. The other inner surface of the pair of inner surfaces, that is, the inner surface on the side where the straight line Lp is inclined with respect to the axis Yk above the lower surface of the support portion 31d (the inner surface on the left side in the drawing). Is In2. The extending direction of the inner side surface In1 is parallel to the axis Yk, and extends outward from the lower side with respect to the straight line Lp (plate thickness direction Dp). On the other hand, the extending direction of the inner surface In2 is parallel to the straight line Lp, that is, the plate thickness direction Dp of the support portion 31d. The through hole 31d1 is formed when the key frame 31 is molded with synthetic resin as described above. In the first embodiment, the through hole 31d1 is a plate with the lower surface of the support portion 31d as a boundary. It is formed by extracting the mold in the thickness direction Dp. Therefore, the through hole 31d1 is easily formed by molding.

  Further, in assembling the reaction force generating member 21 to the support portion 31d, as described above, the reaction force generating member 21 is inserted by inserting the plurality of leg portions 21-4 into the plurality of through holes 31d1, respectively. Is fixed on the support portion 31d. In this assembly, the reaction force generating member 21 is pushed into the support portions 31d by pushing the reaction force generating member 21 in the directions of the axial centers Yw and Yb while bringing the right side surface of the leg portion 21-4 in FIG. 3 into contact with the inner surface In1 of the through hole 31d1. . In this case, the leg 21-4 does not contact (interfere) with the inner side surface of the through hole 31d1 over a long distance (ie, a large area), and the axis Yk of the axial center Yk extends along the inner side surface In1 in the through hole 31d1. Enter smoothly in the direction.

  If the leg 21-4 is further pushed into the through hole 31d1, the inner diameter of the through hole 31d1 at the lower surface position of the support 31d is slightly smaller than the outer diameter of the leg 21-4. A leg whose lower end is in contact with the outer peripheral surface of the leg 21-4 over the entire circumference at a part in the direction of the axis Yk of the leg 21-4 and in contact with the lower end of the inner side surface in the through hole 31d1. Since a part of the portion is deformed, the reaction force generating member 21 is fixed to the support portion 31d. In this case, the outer peripheral surface portion of the leg portion 21-4 that contacts the inner side surface of the through hole 31d1 is greatly deformed in the direction perpendicular to the direction of the axis Yk even if it is short in the direction of the axis Yk. 21-4 is stably held in the through hole 31d1 with a large force.

  In this case, the angle θp1 formed by the lower surface of the base portion 21-3 and the plane perpendicular to the axes Yw and Yb of the dome portions 21w1 and 21b1 (that is, the angle θp1 with respect to the upper surface of the lower surface of the base portion 21-3) is Is equal to the angle θp2 formed by the axis Yw, Yb and the plate thickness direction Dp of the support portion 31d (and the angle θp3 formed by the axis Yk of the leg portion 21-4 and the straight line Lp). The lower surface is orthogonal to the plate thickness direction Dp and parallel to the upper surface of the support portion 31d. Therefore, the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d, and the reaction force generating member 21 is fixed in close contact with the upper surface of the support portion 31d.

  Furthermore, the outer diameters of the portions other than the tip portion of the leg portion 21-4 (portion that does not contact the inner side surface of the through hole 31d) are the same, and the outer peripheral surface of the leg portion 21-4 that contacts the inner side surface of the through hole 31d. Deforms mainly in the radial direction. Therefore, the deformation of the outer peripheral surface of the leg portion 21-4 does not adversely affect the close contact of the lower surface of the base portion 21-3 with the upper surface of the support portion 31d, and the lower surface of the base portion 21-3 is used as the upper surface of the support portion 31d. Easy to adhere to. Further, after the reaction force generating member 21 is fixed to the support portion 31d, the force that the deformed portion of the leg portion 21-4 attempts to return to the original shape acts on the outer side in the radial direction of the leg portion 21-4. The close contact between the lower surface of the portion 21-3 and the upper surface of the support portion 31d is stably maintained. As a result, the lower surface of the base portion 21-3, that is, the plane opposite to the dome portions 21w1, 21b1 is brought into close contact with the installation surface (upper surface) of the support portion 31d, and the reaction force generating member 21 is easily and stably supported on the support portion 31d. Can be assembled and fixed.

  Next, the operation of the keyboard device according to the first embodiment configured as described above will be described. When the performer starts to press the white key 11w and the black key 11b, the white key 11w and the black key 11b start swinging around the swing axes Cw and Cb against the reaction force of the springs 34w and 34b, respectively. The front ends of the white key 11w and the black key 11b are displaced downward to disengage the engaging portions 11w3 and 11b3 from the upper limit stopper members 35w and 35b. , 21b2 is in contact with the rear end of the upper surface. When the white key 11w and the black key 11b are further pressed, the front end portions of the white key 11w and the black key 11b are further displaced downward, and the dome portion 21w1 of the reaction force generating member 21 is pressed by the pressing portions 11w1 and 11b1. , 21b1 starts to deform almost uniformly over the entire circumference. Thereby, in addition to the reaction force by the springs 34w and 34b, the performer begins to feel the reaction force that gradually increases in the dome portions 21w1 and 21b1. In this case, the deformation of the dome portions 21w1 and 21b1 is substantially symmetric with respect to the axial centers Yw and Yb.

  However, in reality, the reaction force generating members 21w and 21b are pressed by the white key 11w and the black key 11b that rotate around the swing axes Cw and Cb, respectively, so that the dome portions 21w1 and 21b1 and the top portions 21w2 and 21b2 are pressed. Since the pressing direction of the white key 11w and the black key 11b slightly changes according to the rotation of the white key 11w and the black key 11b, the deformation of the dome portions 21w1 and 21b1 is strictly limited to the axial centers Yw and Yb. Not symmetric. However, the change in the pressing direction is slight, and at the peak of the reaction force, the dome portions 21w1, 21b1 and the dome portions 21w1, 21b1, and the normals of the lower surfaces of the pressing portions 11w1, 11b1 are parallel to the axial centers Yw, Yb. Since the top portions 21w2 and 21b2 are pressed by the white key 11w and the black key 11b, respectively, the deformation of the dome portions 21w1 and 21b1 may be regarded as being substantially symmetric with respect to the axial centers Yw and Yb.

  When the white key 11w and the black key 11b are further pressed, the reaction force of the reaction force generating members 21w and 21b reaches a peak, and then the dome portions 21w1 and 21b1 start to buckle. In this case, buckling of the dome portions 21w1 and 21b1 occurs almost simultaneously over the entire circumference. As a result, the reaction force of the reaction force generating members 21w and 21b against the player's key depression decreases rapidly, and the player feels a clear click feeling. Note that the key switches 38w and 38b change from the off state to the on state by being slightly delayed from the buckling and by pressing the protruding portions protruding from the lower surfaces of the white key 11w and the black key 11b. In response to the change of the key switches 38w and 38b to the on state, a tone signal generation circuit (not shown) starts to generate tone signals.

  Further, when the white key 11w and the black key 11b are pressed, the dome portions 21w1 and 21b1 are further deformed to increase the reaction force after the reaction force is rapidly reduced. Thereafter, the lower surfaces of the front ends of the white key 11w and the black key 11b come into contact with the lower limit stopper members 36w and 36b, and the swinging of the white key 11w and the black key 11b is finished. In this state, the elastic deformation of the reaction force generating members 21w and 21b is also finished.

  When the white key 11w and the black key 11b are released, the front ends of the white key 11w and the black key 11b are moved upward by the reaction force of the dome portions 21w1, 21b1 of the reaction force generating member 21 and the springs 34w, 34b. Displace. In the process in which the front ends of the white key 11w and the black key 11b are displaced upward, the key switches 38w and 38b change from the on state to the off state, and the tone signal generation circuit (not shown) stops generating the tone signal. To control. Further, in the process in which the front end portions of the white key 11w and the black key 11b return upward, the reaction force generating members 21w and 21b start to return to the original shape. Further, when the front end portions of the white key 11w and the black key 11b are displaced upward, the engaging portions 11w3 and 11b3 come into contact with the upper limit stopper members 35w and 35b, and the white key 11w and the black key 11b return to the key release state. Then, the key release operation of the white key 11w and the black key 11b ends.

  In the keyboard device configured in this way, as described above, the lower surface of the base portion 21-3, that is, the opposite surface of the dome portions 21w1 and 21b1 is brought into close contact with the installation surface (upper surface) of the support portion 31d, so The force generating member 21 can be easily and stably assembled and fixed to the support portion 31d. In the operation of the keyboard device, the dome portions 21w1 and 21b1 of the reaction force generating member 21 assembled to the support portion 31d as described above are the pressing portions 11w1 of the white key 11w and the black key 11b at the reaction force peak. 11b1 is pressed in the directions of the axial centers Yw and Yb of the dome portions 21w1 and 21b1, so that the performer can obtain a good key pressing feeling.

  In addition, in the said 1st Embodiment, the example which has arrange | positioned the five dome parts 21w1, 21b1 on the base part 21-3 of the reaction force generation member 21 was demonstrated. However, the number of the dome portions 21w1, 21b1 may be larger or smaller than “5”. In particular, in the present invention, the number of dome portions 21w1, 21b1 arranged on the base portion 21-3 is one, that is, one dome portion 21w1, 21b1 for one white key 11w and one black key 11b. You may make it arrange | position the many reaction force generation | occurrence | production members 21 which have these. In the first embodiment, the reaction force generating member 21 is provided with ten leg portions 21-4. However, the number of leg portions 21-4 may be an appropriate number other than ten. Note that the modified examples of the first embodiment are also applied to other embodiments and other modified examples described later.

  In the first embodiment, the extending direction of the inner surface In1 is parallel to the direction of the axis Yk of the leg 21-4, and the extending direction of the inner surface In2 is the plate thickness direction Dp of the support portion 31d. And parallel. However, as in Modifications 1 to 3 below, the extending direction of the inner side surfaces In1 and In2 can be changed. In addition, in the following modifications 1-3, it is the same as that of the said 1st Embodiment except the following changed part.

a1. Modification 1
First, Modification 1 of the first embodiment will be described. In Modification 1, as shown in FIG. 4A, the inner side surface In1 of the through hole 31d1 is made to spread outward as compared to the case of the first embodiment. In other words, the inner side surface In1 extends upward from the position of the lower surface of the support portion 31d in contact with the inner peripheral surface of the through hole 31d1 so as to incline radially outward from the direction of the axis Yk. Also in the first modification, the through hole 31d1 is formed in a truncated cone shape so as to spread from the lower surface of the support portion 31d toward the upper surface, and therefore the through hole 31d1 is formed in the plate thickness direction Dp with the lower surface of the support portion 31d as a boundary. It is easily formed by pulling out the mold.

  In the first modification, the inner surface In1 of the through hole 31d1 is not parallel to the axis Yk of the leg 21-4. Therefore, when the leg 21-4 is inserted into the through hole 31d1, the leg 21- 4 cannot enter along the inner surface In1. However, when the leg 21-4 is allowed to enter the through hole 31d1, the leg 21-4 is not brought into contact (interference) with the inner surface of the through hole 31d1 over a long distance (ie, a large area). It is possible to smoothly enter the through hole 31d1 in the direction of the axis Yk. And also in this modification 1, like the case of the said 1st Embodiment, engagement with the lower surface of the through-hole 31d1 of the support part 31d and the outer peripheral surface of the leg part 21-4, and the base part 21-3 By the close contact between the lower surface and the installation surface (upper surface) of the support portion 31d, the reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d.

a2. Modification 2
Next, Modification 2 of the first embodiment will be described. In the second modification, as shown in FIG. 4B, the inner side surface In2 of the through hole 31d1 is extended outward as compared to the case of the first embodiment. In other words, the inner side surface In2 extends upwardly from the lower surface position of the support portion 31d that contacts the inner peripheral surface of the through hole 31d1 while being inclined radially outward from the direction of the straight line Lp. Also in this modified example 2, the through hole 31d1 is formed in a truncated cone shape so as to spread from the lower surface of the support portion 31d toward the upper surface, and therefore the through hole 31d1 is formed in the plate thickness direction Dp with the lower surface of the support portion 31d as a boundary. It is easily formed by pulling out the mold.

  In the second modification, as in the case of the first embodiment, since the inner surface In1 of the through hole 31d1 is parallel to the axis Yk of the leg 21-4, the leg 21-4 is passed through the through hole. When entering 31d1, the leg 21-4 can enter along the inner side surface In1. Also in this case, when the leg 21-4 is allowed to enter the through hole 31d1, the leg 21-4 is brought into contact (interference) over a long distance (that is, a large area) with the inner surface of the through hole 31d1. Without being made, it is possible to smoothly enter the through hole 31d1 in the direction of the axis Yk. And also in this modification 2, like the case of the said 1st Embodiment, engagement with the lower surface of the through-hole 31d1 of the support part 31d and the outer peripheral surface of the leg part 21-4, and the base part 21-3 By the close contact between the lower surface and the installation surface (upper surface) of the support portion 31d, the reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d.

a3. Modification 3
Next, Modification 3 of the first embodiment will be described. In the third modification, as shown in FIG. 4C, as in the first modification, the inner surface In1 is positioned from the lower surface position of the support portion 31d that contacts the inner peripheral surface of the through hole 31d1, and the axial center Yk. The lower surface position of the support part 31d is inclined to the outer side in the radial direction from the direction of the inner surface and extends upward and the inner side surface In2 is in contact with the inner peripheral surface of the through hole 31d1 as in the second modification. From the direction of the straight line Lp, it is inclined outward in the radial direction and extends upward. Also in the third modification, the through hole 31d1 is formed in a truncated cone shape so as to spread from the lower surface of the support portion 31d toward the upper surface, and therefore the through hole 31d1 is formed in the plate thickness direction Dp with the lower surface of the support portion 31d as a boundary. It is easily formed by pulling out the mold.

  In the third modification, the inner surface In1 of the through hole 31d1 is not parallel to the axis Yk of the leg 21-4. Therefore, when the leg 21-4 is inserted into the through hole 31d1, the leg 21- 4 cannot enter along the inner surface In1. However, when the leg 21-4 is allowed to enter the through hole 31d1, the leg 21-4 is not brought into contact (interference) with the inner surface of the through hole 31d1 over a long distance (that is, a large area). It is possible to smoothly enter the through hole 31d1 in the direction of the axis Yk. And also in this modification 3, like the case of the said 1st Embodiment, engagement with the lower surface of the through-hole 31d1 of the support part 31d and the outer peripheral surface of the leg part 21-4, and the base part 21-3 By the close contact between the lower surface and the installation surface (upper surface) of the support portion 31d, the reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d.

a4. Other Modified Examples In the first embodiment and the modified examples 1 to 3, when forming the support portion 31d, the forming die is extracted in the plate thickness direction Dp with the lower surface of the support portion 31d as a boundary. did. However, the direction in which the mold is extracted may be any direction as long as it is a direction between the direction of the inner surface In1 and the direction of the inner surface In2 of the through hole 32d1. Note that this modification is also applied to second to twelfth embodiments described later and modifications thereof. However, the through-hole 32d1 is appropriately replaced with the through-holes 31d2, 31d3, 31d ′ to 31d3 ′, 31d ″ to 31d3 ″ in the respective embodiments and modifications thereof. In the third embodiment and the third modification thereof, the sixth embodiment, the ninth embodiment and the twelfth embodiment, the inner side surface In1 and the inner side surface In2 are changed to the inner side surfaces In11 and In12 and the inner side surfaces In21 and In22. Each shall be replaced.

  In the first embodiment and the first to third modifications thereof, the shape of the through hole 31d1 is a truncated cone. Therefore, in the said 1st Embodiment and its modification 2, the outer peripheral surface of leg part 21-4 contacts the inner surface In1 of the through-hole 31d1 with the straight line along the direction of the axial center Yk. However, instead of this, in the through hole 31d1 in the first embodiment and the modification 2 thereof, the cross-sectional shape perpendicular to the axial center Yk of the inner side surface in the vicinity of the inner side surface (straight line) In1 is made circular. The outer peripheral surface of the leg 21-4 may be in surface contact with the inner side surface in the vicinity of the inner side surface (straight line) In1 in the circumferential direction along the axis Yk. In the first and third modifications of the first embodiment, the outer peripheral surface of the leg portion 21-4 is not in contact with the inner surface of the through hole 31d1 along the direction of the axis Yk. However, instead of this, in the through hole 31d in Modification 1 and Modification 3 of the first embodiment, the width of the through hole 31d is the same as the diameter of the leg portion 21-4 in the direction perpendicular to the paper surface. The cross section orthogonal to the axis Yk may be oval in shape so that the outer peripheral surface of the leg 21-4 contacts the inner surface of the through hole 31d in the direction perpendicular to the paper surface. Note that these modifications are also applied to second to thirteenth embodiments described later. However, the through-hole 31d1 and the inner side surface In1 are appropriately read in the through-holes 31d2, 31d3, 31d ′ to 31d3 ′, 31d ″ to 31d3 ″ and the inner side surfaces In1, In11, and In12 in the respective embodiments and modifications thereof. Shall be replaced.

b. 2nd Embodiment Next, 2nd Embodiment which provided the through-hole 31d2 different from the through-hole 31d1 of the said 1st Embodiment in the support part 31d is described using FIG. The through hole 31d2 in the second embodiment is configured as follows. The shape of the through hole 31d2 at the upper surface position of the support portion 31d (that is, the position on the entry side of the leg portion 21-4) is a circle centered on the axis Yk of the leg portion 21-4, and the inner diameter thereof is the leg portion 21-4. Is slightly smaller than the outer diameter of the cylindrical portion. The shape of the through hole 31d2 at the lower surface position of the support portion 31d (that is, the protruding side position of the leg portion 21-4) is also circular, but the inner diameter thereof is larger than the inner diameter of the upper surface position, and the center thereof is the leg portion 21. -4 is different from the axis Yk. The inner side surface of the through hole 31d2 is formed in a truncated cone shape whose inner diameter increases from the upper side to the lower side.

  The inclination angle of the inner surface of the through hole 31d2 is set as follows. In this case, a straight line in the plate thickness direction Dp passing through the center position of the through hole 31d2 on the upper surface of the support portion 31d (that is, the planar position where the leg portion 21-4 contacts the inner peripheral surface of the through hole 31d2 over the entire circumference). Is Lp. Further, an angle formed by the axis Yk of the leg 21-4 and the straight line Lp is defined as θp3. Also in this case, the axis Yk of the leg 21-4 is parallel to the axes Yw and Yb of the dome portions 21w1 and 21b1, and the straight line Lp is the same as the plate thickness direction Dp. As described in the first embodiment, the angle θp1 formed by the lower surface of the base portion 21-3 and the plane perpendicular to the axial centers Yw and Yb of the dome portions 21w1 and 21b1, and the plate of the axial centers Yw and Yb and the support portion 31d. The angle θp2 is equal to the thickness direction Dp. In FIG. 5 as well, P1 indicates a plane parallel to the upper surface of the base portion 21-3, that is, a plane orthogonal to the axes Yw and Yb.

  Also in this case, a plane including the axis Yk and the straight line Lp is assumed. Of the pair of inner side surfaces (that is, the pair of straight lines) where the assumed plane and the inner side surface of the through hole 31d2 intersect, the axis Yk is below the upper surface of the support portion 31d with respect to the straight line Lp. An inner surface (an inner surface on the left side in the figure) on the inclined side is defined as In1. The other inner surface of the pair of inner surfaces, that is, the inner surface on the side where the straight line Lp is inclined with respect to the axis Yk below the upper surface of the support portion 31d (the inner surface on the right side in the figure). Is In2. The extending direction of the inner side surface In1 is parallel to the axis Yk, and extends outward from the upper side with respect to the straight line Lp (plate thickness direction Dp). On the other hand, the extending direction of the inner surface In2 is parallel to the straight line Lp, that is, the plate thickness direction Dp of the support portion 31d. The through hole 31d2 is formed when the key frame 31 is molded with synthetic resin as described above. In the second embodiment, the through hole 31d2 is a plate with the upper surface of the support portion 31d as a boundary. It is formed by extracting the mold in the thickness direction Dp. Therefore, the through hole 31d2 is easily formed by molding. Since the other configuration is the same as that of the first embodiment, the same reference numerals as those of the first embodiment are given and the description thereof is omitted.

  And in the assembly | attachment to the support part 31d of the reaction force generation member 21, like the case of the said 1st Embodiment, by making the some leg part 21-4 penetrate | invade into the some through-hole 31d2, and press-fit, respectively. The reaction force generating member 21 is fixed on the support portion 31d. In this assembly, the reaction force generating member 21 is pushed into the support portions 31d by pushing the reaction force generating member 21 in the directions of the axial centers Yw and Yb while the left side surface of the leg portion 21-4 in FIG. . In this case, the leg 21-4 does not contact (interfere) with the inner surface of the through hole 31d2 over a long distance (that is, a large area), and the shaft center Yk extends along the inner surface In1 in the through hole 31d2. Enter smoothly in the direction.

  Then, the leg portion 21-4 is further pushed into the through hole 31d2 until the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d. In this state, as in the case of the first embodiment, the angle θp1 formed by the lower surface of the base portion 21-3 and the plane perpendicular to the axial centers Yw and Yb of the dome portions 21w1 and 21b1 is the axial center Yw. , Yb and the plate thickness direction Dp of the support portion 31d is equal to the angle θp2 (and the angle θp3 formed by the axis Yk of the leg portion 21-4 and the straight line Lp). Therefore, the lower surface of the base portion 21-3 is orthogonal to the plate thickness direction Dp and parallel to the upper surface of the support portion 31d, and the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d. Further, in this state, the inner diameter of the through hole 31d2 at the upper surface position of the support portion 31d is slightly smaller than the outer diameter of the columnar portion of the leg portion 21-4, so that the reaction force generating member 21 is fixed to the support portion 31d. Can do. Further, also in the second embodiment, the outer diameters of the portions other than the tip portion of the leg portion 21-4 (the portion that does not contact the inner surface of the through hole 31d2) are the same, and the outer surface contacts the inner surface of the through hole 31d2. The outer peripheral surface of the leg 21-4 is mainly deformed in the radial direction. And after fixing the reaction force generation member 21 to the support part 31d, the force which the part which leg part 21-4 deform | transformed tries to return to an original form acts on the radial direction outer side of leg part 21-4. As a result, also in the second embodiment, as in the case of the first embodiment, the lower surface of the base portion 21-3, that is, the plane opposite to the dome portions 21w1, 21b1, is the installation surface (upper surface) of the support portion 31d. The reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d.

  In the second embodiment, the extending direction of the inner surface In1 is parallel to the direction of the axis Yk of the leg 21-4, and the extending direction of the inner surface In2 is the plate thickness direction Dp of the support portion 31d. And parallel. However, as in Modifications 1 to 3 below, the extending direction of the inner side surfaces In1 and In2 can be changed. In addition, in the following modifications 1-3, it is the same as that of the said 2nd Embodiment except the following changed part.

b1. Modification 1
First, Modification 1 of the second embodiment will be described. In Modification 1, as shown in FIG. 6A, the inner side surface In1 of the through hole 31d2 is spread outwardly downward as compared to the case of the second embodiment. That is, the inner side surface In1 extends downward from the upper surface position of the support portion 31d that contacts the inner peripheral surface of the through hole 31d2 so as to be inclined radially outward from the direction of the axis Yk. Also in the first modification, the through hole 31d2 is formed in a truncated cone shape so as to expand from the upper surface of the support portion 31d toward the lower surface, and thus the through hole 31d2 is formed in the plate thickness direction Dp with the upper surface of the support portion 31d as a boundary. It is easily formed by pulling out the mold.

  In the first modification, the inner surface In1 of the through hole 31d2 is not parallel to the axis Yk of the leg 21-4. Therefore, when the leg 21-4 is inserted into the through hole 31d2, the leg 21- 4 cannot enter along the inner surface In1. However, when the leg 21-4 is allowed to enter the through hole 31d2, the leg 21-4 is not brought into contact (interference) over a long distance (that is, a large area) with the inner surface of the through hole 31d2. It is possible to smoothly enter the through hole 31d2 in the direction of the axis Yk. And also in this modification 1, engagement with the upper surface of the through-hole 31d2 of the support part 31d and the outer peripheral surface of the leg part 21-4, and the installation surface (upper surface) of the lower surface of the base part 21-3, and the support part 31d The reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d.

b2. Modification 2
Next, Modification 2 of the second embodiment will be described. In the modified example 2, as shown in FIG. 6B, the inner side surface In2 of the through hole 31d2 is spread outwardly downward as compared with the case of the second embodiment. In other words, the inner side surface In2 extends downward from the upper surface position of the support portion 31d that contacts the inner peripheral surface of the through hole 31d2 so as to be inclined radially outward from the direction of the straight line Lp. Also in this modified example 2, since the through hole 31d2 is formed in a truncated cone shape so as to spread from the upper surface of the support portion 31d toward the lower surface, the through hole 31d2 extends in the plate thickness direction Dp with the upper surface of the support portion 31d as a boundary. It is easily formed by pulling out the mold.

  In the second modification, as in the case of the second embodiment, since the inner surface In1 of the through hole 31d2 is parallel to the axis Yk of the leg 21-4, the leg 21-4 is passed through the through hole. When entering 31d2, the leg portion 21-4 can enter along the inner side surface In1. Also in this case, when the leg 21-4 is allowed to enter the through hole 31d2, the leg 21-4 is brought into contact (interference) over a long distance (that is, a large area) with the inner surface of the through hole 31d2. Without making it, it is possible to smoothly enter the through hole 31d2 in the direction of the axis Yk. And also in this modification 2, engagement with the upper surface of the through-hole 31d2 of the support part 31d and the outer peripheral surface of the leg part 21-4, and the installation surface (upper surface) of the lower surface of the base part 21-3, and the support part 31d The reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d.

b3. Modification 3
Next, Modification 3 of the second embodiment will be described. In the third modification, as shown in FIG. 6 (C), as in the first modification, the inner surface In1 has an axis Yk from the upper surface position of the support portion 31d that contacts the inner peripheral surface of the through hole 31d2. The upper surface position of the support portion 31d is inclined to the outside in the radial direction with respect to the direction and extends downward and the inner surface In2 is in contact with the inner peripheral surface of the through hole 31d2 as in the second modification. From the direction of the straight line Lp, it is inclined outward in the radial direction and extends downward. Also in this modified example 3, the through hole 31d2 is formed in a truncated cone shape so as to spread from the lower surface of the support portion 31d toward the upper surface, and therefore the through hole 31d2 is formed in the plate thickness direction Dp with the upper surface of the support portion 31d as a boundary. It is easily formed by pulling out the mold.

  In the third modification, the inner surface In1 of the through hole 31d2 is not parallel to the axis Yk of the leg 21-4. Therefore, when the leg 21-4 is inserted into the through hole 31d2, the leg 21- 4 cannot enter along the inner surface In1. However, when the leg 21-4 is allowed to enter the through hole 31d2, the leg 21-4 is not brought into contact (interference) over a long distance (that is, a large area) with the inner surface of the through hole 31d2. It is possible to smoothly enter the through hole 31d2 in the direction of the axis Yk. And also in this modification 3, engagement with the upper surface of the through-hole 31d2 of the support part 31d and the outer peripheral surface of the leg part 21-4, and the installation surface (upper surface) of the lower surface of the base part 21-3 and the support part 31d The reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d.

c. Third Embodiment Next, a third embodiment in which a through hole 31d3 different from the through holes 31d1 and 31d2 of the first and second embodiments is provided in the support portion 31d will be described with reference to FIG. The through hole 31d3 in the third embodiment is configured as follows. The shape of the through hole 31d3 at the intermediate position between the upper surface position (that is, the entry side position of the leg portion 21-4) and the lower surface position (that is, the protruding side position of the leg portion 21-4) of the support portion 31d is the shape of the leg portion 21-4. It is a circle centered on the axis Yk, and its inner diameter is slightly smaller than the outer diameter of the columnar portion of the leg 21-4. Further, the shape of the through hole 31d3 at the upper surface position and the lower surface position of the support portion 31d is also circular, but the inner diameter thereof is larger than the inner diameter of the intermediate position, and the center thereof is the axis Yk of the leg portion 21-4. Is different. The upper part of the inner side surface of the through hole 31d3 is formed in a truncated cone shape whose inner diameter increases as it goes upward from the intermediate position, and the lower part of the inner side surface of the through hole 31d3 has an inner diameter as it goes downward from the intermediate position. It is formed in a truncated cone shape.

  The inclination angle of the inner surface of the through hole 31d3 is set as follows. In this case, a straight line in the plate thickness direction Dp passing through the center position of the through hole 31d3 at the intermediate position of the support portion 31d is defined as Lp. Further, an angle formed by the axis Yk of the leg 21-4 and the straight line Lp is defined as θp3. Also in this case, the axis Yk of the leg 21-4 is parallel to the axes Yw and Yb of the dome portions 21w1 and 21b1, and the straight line Lp is the same as the plate thickness direction Dp. As described in the first and second embodiments, the angle θp1 formed by the lower surface of the base portion 21-3 and the plane perpendicular to the axial centers Yw and Yb of the dome portions 21w1 and 21b1, and the axial centers Yw and Yb The angle θp2 is equal to the plate thickness direction Dp of the support portion 31d. Also in FIG. 7, P1 indicates a plane parallel to the upper surface of the base portion 21-3, that is, a plane orthogonal to the axial centers Yw and Yb.

  Also in this case, a plane including the axis Yk and the straight line Lp is assumed. In the upper part of the through hole 31d3 above the intermediate position, the axis Yk is the support portion 31d among the pair of inner side surfaces (that is, a pair of straight lines) where the assumed plane and the inner side surface of the through hole 31d3 intersect. The inner surface (the inner surface on the upper right side in the figure) on the side inclined with respect to the straight line Lp above the intermediate position is In11. The other inner surface of the pair of inner surfaces, that is, the inner surface on the side where the straight line Lp is inclined with respect to the axis Yk above the intermediate position of the support portion 31d (on the upper left side in the drawing). The inner surface is In21. The extending direction of the inner surface In11 is parallel to the axis Yk and extends outward from the intermediate position with respect to the straight line Lp (plate thickness direction Dp). On the other hand, the extending direction of the inner surface In21 is parallel to the straight line Lp, that is, the plate thickness direction Dp of the support portion 31d.

  Further, below the intermediate position of the through hole 31d3, the axis Yk is the support portion 31d among the pair of inner side surfaces (that is, a pair of straight lines) where the assumed plane and the inner side surface of the through hole 31d3 intersect. The inner surface (the inner surface on the lower left side in the figure) on the side inclined with respect to the straight line Lp below the intermediate position is In12. Also, the other inner surface of the pair of inner surfaces, that is, the inner surface on the side where the straight line Lp is inclined with respect to the axis Yk below the intermediate position of the support portion 31d (lower right side in the figure) The inner surface) is In22. The extending direction of the inner surface In12 is parallel to the axis Yk and extends outward from the intermediate position downward with respect to the straight line Lp (plate thickness direction Dp). On the other hand, the extending direction of the inner surface In22 is parallel to the straight line Lp, that is, the plate thickness direction Dp of the support portion 31d. The through hole 31d3 is formed when the key frame 31 is molded with a synthetic resin as described above. In the third embodiment, the through hole 31d3 is formed in the thickness direction with the intermediate position as a boundary. It is formed by extracting a mold from Dp. Therefore, the through hole 31d3 is easily formed by molding. Since other configurations are the same as those in the first and second embodiments, the same reference numerals as those in the first and second embodiments are given, and description thereof is omitted.

  Then, in assembling the reaction force generating member 21 to the support portion 31d, as in the first and second embodiments, the plurality of leg portions 21-4 are respectively inserted into the plurality of through holes 31d3 and press-fitted. By doing so, the reaction force generating member 21 is fixed on the support portion 31d. In this assembly, the right side surface of the leg portion 21-4 in FIG. 7 is brought into contact with the inner side surface In11 of the through hole 31d3, and the left side surface of the leg portion 21-4 in FIG. While abutting, the reaction force generating member 21 is pushed in the directions of the axial centers Yw and Yb and pushed into the support portion 31d. As a result, the leg 21-4 does not contact (interfere) with the inner surface of the through hole 31d3 over a long distance (that is, a large area), and is axially centered along the inner surfaces In11 and In12 in the through hole 31d3. Enter smoothly in the direction of Yk.

  Then, the leg portion 21-4 is further pushed into the through hole 31d3 until the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d. In this state, as in the case of the first and second embodiments, the angle θp1 formed by the lower surface of the base portion 21-3 and the plane perpendicular to the axial centers Yw and Yb of the dome portions 21w1 and 21b1 is It is equal to an angle θp2 formed by the axial centers Yw and Yb and the plate thickness direction Dp of the support portion 31d (and an angle θp3 formed by the axial center Yk of the leg portion 21-4 and the straight line Lp). Therefore, the lower surface of the base portion 21-3 is orthogonal to the plate thickness direction Dp and parallel to the upper surface of the support portion 31d, and the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d. Further, in this state, the inner diameter of the through hole 31d3 at the intermediate position of the support portion 31d is slightly smaller than the outer diameter of the columnar portion of the leg portion 21-4, so the reaction force generating member 21 is fixed to the support portion 31d. be able to. Furthermore, also in this third embodiment, the outer diameters of the portions other than the tip portion of the leg portion 21-4 (the portion not in contact with the inner side surface of the through hole 31d3) are the same, and contact with the inner side surface of the through hole 31d3. The outer peripheral surface of the leg 21-4 is mainly deformed in the radial direction. And after fixing the reaction force generation member 21 to the support part 31d, the force which the part which leg part 21-4 deform | transformed tries to return to an original form acts on the radial direction outer side of leg part 21-4. As a result, also in the third embodiment, as in the case of the first and second embodiments, the lower surface of the base portion 21-3, that is, the plane opposite to the dome portions 21w1, 21b1, is the installation surface of the support portion 31d. The reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d by being in close contact with the (upper surface).

  In the third embodiment, the extending direction of the inner side surfaces In11 and In12 is parallel to the direction of the axis Yk of the leg 21-4, and the extending direction of the inner side surfaces In21 and In22 is set to the support portion 31d. Parallel to the plate thickness direction Dp. However, the extending directions of the inner side surfaces In11, In12, In21, and In22 can be changed as in Modifications 1 to 3 below. In addition, in the following modifications 1-3, it is the same as that of the said 3rd Embodiment except the following changed part.

c1. Modification 1
First, Modification 1 of the third embodiment will be described. In the first modification, as shown in FIG. 8A, the inner surface In11 of the through hole 31d3 extends outward as compared to the case of the third embodiment, and the through hole 31d3 The inner side surface In12 is made to spread outward as compared to the case of the third embodiment. That is, the inner side surface In11 extends upwardly from the intermediate position of the support portion 31d contacting the inner peripheral surface of the through hole 31d3 while being inclined outward in the radial direction from the direction of the axis Yk. However, from the intermediate position of the support part 31d which contacts the inner peripheral surface of the through-hole 31d3, it is inclined downward in the radial direction from the direction of the axis Yk and extends downward. Also in this modified example 1, since the through hole 31d3 is formed in a truncated cone shape so as to spread from the intermediate position of the support portion 31d toward the upper surface and the lower surface, the through hole 31d3 is formed at the intermediate position of the support portion 31d. It is easily formed by extracting the mold in the plate thickness direction Dp.

  In the first modification, the inner surfaces In11 and In12 of the through hole 31d3 are not parallel to the axis Yk of the leg 21-4. Therefore, when the leg 21-4 is inserted into the through hole 31d3, the leg The portion 21-4 cannot enter along the inner side surfaces In11 and In12. However, when the leg 21-4 is allowed to enter the through hole 31d3, the leg 21-4 is not brought into contact (interference) over a long distance (that is, a large area) with the inner surface of the through hole 31d3. It is possible to smoothly enter the through hole 31d3 in the direction of the axis Yk. And also in this modification 1, the said intermediate position of the through-hole 31d3 of the support part 31d and the outer peripheral surface of the leg part 21-4, and the installation surface (the lower surface of the base part 21-3, and the support part 31d ( With the close contact with the upper surface, the reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d.

c2. Modification 2
Next, Modification 2 of the third embodiment will be described. In the second modification, as shown in FIG. 8B, the inner surface In21 of the through hole 31d3 extends outward as compared to the case of the third embodiment, and the through hole 31d3 The inner side surface In22 is made to spread outward as compared to the case of the third embodiment. In other words, the inner side surface In21 extends from the intermediate position of the support portion 31d contacting the inner peripheral surface of the through hole 31d3 to the outside in the radial direction from the direction of the straight line Lp and extends upward. The intermediate portion 31d that is in contact with the inner peripheral surface of the through hole 31d3 is inclined downward in the radial direction from the direction of the straight line Lp and extends downward. Also in this modified example 2, since the through hole 31d3 is formed in a truncated cone shape so as to expand from the intermediate position of the support portion 31d toward the upper surface and the lower surface, the through hole 31d3 is formed at the intermediate position of the support portion 31d. It is easily formed by extracting the mold in the plate thickness direction Dp.

  Further, in the second modification, as in the case of the third embodiment, the inner surface In11, In12 of the through hole 31d3 is parallel to the axis Yk of the leg 21-4. When entering the through hole 31d3, the leg 21-4 can enter along the inner side surfaces In11 and In12. Also in this case, when the leg 21-4 is allowed to enter the through hole 31d3, the leg 21-4 is brought into contact (interference) over a long distance (that is, a large area) with the inner surface of the through hole 31d3. Without being made, it is possible to smoothly enter the through hole 31d3 in the direction of the axis Yk. In the second modification, the upper surface of the through hole 31d3 of the support portion 31d is engaged with the intermediate position of the leg portion 21-4, and the lower surface of the base portion 21-3 and the installation surface (upper surface) of the support portion 31d. ), The reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d.

c3. Modification 3
Next, Modification 3 of the third embodiment will be described. In the third modification, as shown in FIG. 8C, as in the first modification, the inner surfaces In11 and In12 are pivoted from the intermediate position of the support portion 31d in contact with the inner peripheral surface of the through hole 31d3. The inner side surfaces In21 and In22 are in contact with the inner peripheral surface of the through hole 31d3 so as to incline outward in the radial direction from the direction of the center Yk and extend upward and downward, respectively. From the intermediate position of the supporting portion 31d to be inclined, it extends to the outside in the radial direction from the direction of the straight line Lp and extends upward and downward, respectively. Also in the third modification, the through hole 31d3 is formed in a truncated cone shape so as to expand from the intermediate position of the support portion 31d toward the upper surface and the lower surface, and thus the through hole 31d3 has the intermediate position of the support portion 31d. It is easily formed by extracting the mold in the thickness direction Dp at the boundary.

  In the third modification, the inner surfaces In11 and In12 of the through hole 31d3 are not parallel to the axis Yk of the leg 21-4. Therefore, when the leg 21-4 enters the through hole 31d3, the leg 21-4 cannot enter along the inner side surfaces In11 and In12. However, when the leg 21-4 is allowed to enter the through hole 31d3, the leg 21-4 is not brought into contact (interference) over a long distance (that is, a large area) with the inner surface of the through hole 31d3. It is possible to smoothly enter the through hole 31d3 in the direction of the axis Yk. And also in this modification 3, engagement with the said intermediate position of the through-hole 31d3 of the support part 31d and the outer peripheral surface of the leg part 21-4, and the installation surface (the lower surface of the base part 21-3, and the support part 31d ( With the close contact with the upper surface, the reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d.

d. Fourth Embodiment Next, a fourth embodiment in which a support portion 31d ′ is arranged horizontally instead of the support portion 31d of the first embodiment inclined with respect to the horizontal will be described with reference to FIG. explain. Also in the fourth embodiment, the axial centers Yw and Yb of the dome portions 21w1 and 21b1 and the top portions 21w2 and 21b2 are inclined upward in the drawing in the same direction as in the first embodiment. Therefore, contrary to the case of the first embodiment, in the base portion 21-3, the right portion in the figure is formed thicker than the left portion in the figure. However, the shapes of the dome portions 21w1, 21b1, the top portions 21w2, 21b2, and the leg portions 21-4 are the same as those in the first embodiment. Further, the upper surface and the lower surface of the base portion 21-3 are flat, the axial centers Yw and Yb are orthogonal to the upper surface of the base portion 21-3, and the axial center Yk of the leg portion 21-4 is the axial center. The point parallel to Yw and Yb is also the same as in the case of the first embodiment. Furthermore, although the support portion 31d ′ is horizontal, the upper and lower surfaces of the support portion 31d ′ are also flat, and the plate thickness of the support portion 31d ′ is uniform as in the case of the first embodiment. is there.

  Also in FIG. 9, a plane that is parallel to the upper surface of the base portion 21-3 (that is, orthogonal to the axial centers Yw and Yb) and intersects the axial centers Yw and Yb at the upper surface of the support portion 31d ′. Represented by P1. Also in this case, if the thickness direction of the support portion 31d ′ is Dp, the angle θp1 formed between the lower surface of the base portion 21-3 and the plane P1 orthogonal to the axial centers Yw and Yb of the dome portions 21w1 and 21b1. Is equal to an angle θp2 formed by the axial centers Yw and Yb and the thickness direction Dp of the support portion 31d ′.

  Also in the fourth embodiment, a through hole 31d1 'is formed in the support portion 31d', and the through hole 31d1 'is configured as follows. The shape of the through hole 31d1 ′ at the lower surface position of the support portion 31d ′ (that is, the protruding side position of the leg portion 21-4) is a circle centering on the axis Yk of the leg portion 21-4, and the inner diameter thereof is the leg portion 21. -4 is slightly smaller than the outer diameter of the cylindrical portion. Further, the shape of the through hole 31d1 ′ at the upper surface position of the support portion 31d ′ (that is, the position on the entry side of the leg portion 21-4) is also circular, but its inner diameter is larger than the inner diameter of the lower surface position, and its center is the leg It is different from the axis Yk of the part 21-4. The inner side surface of the through hole 31d1 'is formed in a truncated cone shape whose inner diameter increases from the bottom to the top.

  The inclination angle of the inner surface of the through hole 31d1 'is set as follows. Also in this case, the plate thickness passing through the center position of the through hole 31d1 ′ on the lower surface of the support portion 31d ′ (that is, the planar position where the leg portion 21-4 contacts the inner peripheral surface of the through hole 31d1 ′ over the entire circumference). Let Lp be a straight line in the direction Dp. Further, an angle formed by the axis Yk of the leg 21-4 and the straight line Lp is defined as θp3. Also in this case, since the axis Yk of the leg 21-4 is parallel to the axes Yw and Yb of the dome portions 21w1 and 21b1, and the straight line Lp is the same as the plate thickness direction Dp, the angle θp3 is An angle θp1 formed by the lower surface of the base portion 21-3 and a plane perpendicular to the axial centers Yw and Yb of the dome portions 21w1 and 21b1, and an angle θp2 formed by the axial centers Yw and Yb and the plate thickness direction Dp of the support portion 31d ′. Is equal to

  Also in this case, a plane including the axis Yk and the straight line Lp is assumed. Of the pair of inner side surfaces (that is, a pair of straight lines) where the assumed plane and the inner side surface of the through hole 31d1 ′ intersect, the axis Yk is a straight line Lp above the lower surface of the support portion 31d ′. The inner side surface (the inner side surface on the left side in the figure) on the side inclined with respect to the surface is defined as In1. The other inner surface of the pair of inner surfaces, that is, the inner surface on the side where the straight line Lp is inclined with respect to the axis Yk above the lower surface of the support portion 31d ′ (the inner surface on the right side in the figure). ) Is In2. The extending direction of the inner side surface In1 is parallel to the axis Yk, and extends outward from the lower side with respect to the straight line Lp (plate thickness direction Dp). On the other hand, the extending direction of the inner surface In2 is parallel to the straight line Lp, that is, the plate thickness direction Dp of the support portion 31d '. The through hole 31d1 ′ is formed when the key frame 31 is molded with a synthetic resin as described above. In the fourth embodiment, the through hole 31d1 ′ is formed on the lower surface of the support portion 31d ′. It is formed by extracting the mold in the thickness direction Dp at the boundary. Therefore, the through hole 31d1 'is easily formed by molding. Since the other configuration is the same as that of the first embodiment, the same reference numerals as those of the first embodiment are given and the description thereof is omitted.

  Then, in assembling the reaction force generating member 21 to the support portion 31d ′, as in the case of the first embodiment, the plurality of leg portions 21-4 are respectively inserted into the plurality of through holes 31d1 ′ and press-fitted. Thus, the reaction force generation member 21 is fixed on the support portion 31d ′. In this assembly, the reaction force generating member 21 is pushed in the directions of the axial centers Yw and Yb and pushed into the support portion 31d ′ while the left side surface of the leg portion 21-4 is in contact with the inner surface In1 of the through hole 31d1 ′. . Thus, the leg 21-4 is axially aligned along the inner surface In1 in the through hole 31d1 ′ without contacting (interfering) with the inner surface of the through hole 31d1 ′ over a long distance (ie, a large area). Enter smoothly in the direction of Yk.

  Then, the leg portion 21-4 is further pushed into the through hole 31d1 'until the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d'. In this state, as in the case of the first embodiment, the angle θp1 formed by the lower surface of the base portion 21-3 and the plane perpendicular to the axis Yw, Yb of the dome portion 21w1, 21b1 is the axis Yw, Yb. And an angle θp2 formed by the plate thickness direction Dp of the support portion 31d ′ (and an angle θp3 formed by the axis Yk of the leg portion 21-4 and the straight line Lp). Therefore, the lower surface of the base portion 21-3 is orthogonal to the plate thickness direction Dp and parallel to the upper surface of the support portion 31d ', and the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d'. Further, in this state, the inner diameter of the through hole 31d1 ′ at the lower surface position of the support portion 31d ′ is slightly smaller than the outer diameter of the columnar portion of the leg portion 21-4, so that the reaction force generating member 21 becomes the support portion 31d ′. Can be fixed. Furthermore, also in the fourth embodiment, the outer diameters of the portions other than the tip portion of the leg portion 21-4 (the portion that does not contact the inner surface of the through hole 31d1 ′) are the same, and the inner surface of the through hole 31d1 ′ is the same. The outer peripheral surface of the leg 21-4 that comes into contact mainly deforms in the radial direction. Then, after the reaction force generating member 21 is fixed to the support portion 31d ', the force that the deformed portion of the leg portion 21-4 tries to return to the original shape acts on the radially outer side of the leg portion 21-4. As a result, also in the fourth embodiment, as in the case of the first embodiment, the lower surface of the base portion 21-3, that is, the plane opposite to the dome portions 21w1 and 21b1, is the installation surface (upper surface) of the support portion 31d ′. The reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d ′.

  In the fourth embodiment, the extending direction of the inner side surface In1 is parallel to the direction of the axis Yk of the leg 21-4, and the extending direction of the inner side surface In2 is the plate thickness direction Dp of the support portion 31d ′. Parallel. However, also in the fourth embodiment, the extending directions of the inner side surfaces In1 and In2 can be changed as in the first to third modifications of the first embodiment (see FIGS. 4A to 4C). is there. That is, the inner side surface In1 is extended from the lower surface position of the support portion 31d ′ contacting the inner peripheral surface of the through-hole 31d1 ′ to the upper side inclining radially outward from the direction of the axis Yk. Also good. Further, the inner side surface In2 may be extended upwardly from the lower surface position of the support portion 31d ′ in contact with the inner peripheral surface of the through hole 31d1 ′, inclining radially outward from the direction of the straight line Lp. Good. Furthermore, the inner side surface In1 is extended from the lower surface position of the support portion 31d ′ contacting the inner peripheral surface of the through-hole 31d1 ′ to the upper side inclining radially outward from the direction of the axis Yk, In addition, the inner side surface In2 may be extended upward from the lower surface position of the support portion 31d ′ that contacts the inner peripheral surface of the through hole 31d1 ′, inclining radially outward from the direction of the straight line Lp. .

  In the fourth embodiment, the support portion 31d 'is disposed horizontally. However, the support portion 31d' may not be disposed horizontally. The major difference between the fourth embodiment and the first embodiment is that the axial centers Yw and Yb of the dome portions 21w1 and 21b1 and the top portions 21w2 and 21b2 are as described above with respect to the plate thickness direction Dp of the support portion 31d ′. It is on the opposite side from the case of the first embodiment, that is, tilted to the left in the upper part of FIG. Accordingly, even if the support portion 31d ′ is not horizontal, the reaction force generating member 21 described in the fourth embodiment is provided as long as the directions of the axial centers Yw and Yb are in the relationship as described above with respect to the plate thickness direction Dp. And the structure of support part 31d 'is applied. This point is also applicable to fifth and sixth embodiments described later.

e. 5th Embodiment Next, 5th Embodiment which provided through-hole 31d2 'different from through-hole 31d1' of the said 4th Embodiment in support part 31d 'is described using FIG. The through hole 31d2 ′ in the fifth embodiment is configured as follows. The shape of the through hole 31d2 ′ at the upper surface position of the support portion 31d ′ (that is, the position on the entry side of the leg portion 21-4) is a circle centered on the axis Yk of the leg portion 21-4, and the inner diameter thereof is the leg portion 21. -4 is slightly smaller than the outer diameter of the cylindrical portion. Further, the shape of the through hole 31d2 ′ at the lower surface position of the support portion 31d ′ (that is, the protruding side position of the leg portion 21-4) is also circular, but its inner diameter is larger than the inner diameter of the upper surface position, and its center is the leg. It is different from the axis Yk of the part 21-4. The inner side surface of the through hole 31d2 ′ is formed in a truncated cone shape having an inner diameter that increases from the top to the bottom.

  The inclination angle of the inner surface of the through hole 31d2 'is set as follows. In this case, the plate thickness direction passes through the center position of the through hole 31d2 ′ on the upper surface of the support portion 31d ′ (that is, the planar position where the leg portion 21-4 contacts the inner peripheral surface of the through hole 31d2 ′ over the entire circumference). Let Dp be the straight line of Dp. Further, an angle formed by the axis Yk of the leg 21-4 and the straight line Lp is defined as θp3. Also in this case, the axis Yk of the leg 21-4 is parallel to the axes Yw and Yb of the dome portions 21w1 and 21b1, and the straight line Lp is the same as the plate thickness direction Dp. As described in the fourth embodiment, the angle θp1 formed between the lower surface of the base portion 21-3 and the plane perpendicular to the axial centers Yw and Yb of the dome portions 21w1 and 21b1, and the axial centers Yw and Yb and the support portion 31d ′. The angle θp2 is equal to the plate thickness direction Dp. Also in FIG. 10, P1 indicates a plane parallel to the upper surface of the base portion 21-3, that is, a plane orthogonal to the axes Yw and Yb.

  Also in this case, a plane including the axis Yk and the straight line Lp is assumed. Of the pair of inner surfaces (that is, a pair of straight lines) where the assumed plane and the inner surface of the through hole 31d2 ′ intersect, the axis Yk is a straight line Lp below the upper surface of the support portion 31d ′. The inner side surface (the inner side surface on the right side in the figure) on the side inclined with respect to the side is referred to as In1. The other inner surface of the pair of inner surfaces, that is, the inner surface on the side where the straight line Lp is inclined with respect to the axis Yk below the upper surface of the support portion 31d ′ (the inner surface on the left side in the drawing). ) Is In2. The extending direction of the inner side surface In1 is parallel to the axis Yk, and extends outward from the upper side with respect to the straight line Lp (plate thickness direction Dp). On the other hand, the extending direction of the inner surface In2 is parallel to the straight line Lp, that is, the plate thickness direction Dp of the support portion 31d '. The through hole 31d2 ′ is formed when the key frame 31 is molded with a synthetic resin as described above. In the fifth embodiment, the through hole 31d2 ′ is formed on the upper surface of the support portion 31d ′. It is formed by extracting the mold in the thickness direction Dp at the boundary. Therefore, the through hole 31d2 'is easily formed by molding. Since the other configuration is the same as that of the fourth embodiment, the same reference numerals as those of the fourth embodiment are given, and the description thereof is omitted.

  Then, in assembling the reaction force generating member 21 to the support portion 31d ′, as in the case of the fourth embodiment, the plurality of leg portions 21-4 are respectively inserted into the plurality of through holes 31d2 ′ and press-fitted. Thus, the reaction force generation member 21 is fixed on the support portion 31d ′. In this assembly, while the right side surface of the leg portion 21-4 in FIG. 10 is in contact with the inner side surface In1 of the through hole 31d2 ′, the reaction force generating member 21 is pushed in the directions of the axial centers Yw and Yb to support the support portion 31d ′. Push into. As a result, the leg 21-4 does not contact (interfere) with the inner surface of the through hole 31d2 ′ over a long distance (ie, a large area), and is axially centered along the inner surface In1 in the through hole 31d2 ′. Enter smoothly in the direction of Yk.

  Then, the leg portion 21-4 is further pushed into the through hole 31d2 'until the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d'. In this state, as in the case of the fourth embodiment, the angle θp1 formed by the lower surface of the base portion 21-3 and the plane perpendicular to the axial centers Yw and Yb of the dome portions 21w1 and 21b1 is the axial center Yw. , Yb and the plate thickness direction Dp of the support portion 31d ′ is equal to the angle θp2 (and the angle θp3 formed by the axis Yk of the leg 21-4 and the straight line Lp). Therefore, the lower surface of the base portion 21-3 is orthogonal to the plate thickness direction Dp and parallel to the upper surface of the support portion 31d ', and the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d'. Further, in this state, the inner diameter of the through hole 31d2 ′ at the upper surface position of the support portion 31d ′ is slightly smaller than the outer diameter of the columnar portion of the leg portion 21-4, so that the reaction force generating member 21 becomes the support portion 31d ′. Can be fixed. Furthermore, also in this fifth embodiment, the outer diameters of the portions other than the tip portion of the leg portion 21-4 (the portion that does not contact the inner surface of the through hole 31d2 ′) are the same, and the inner surface of the through hole 31d2 ′ is the same. The outer peripheral surface of the leg 21-4 that comes into contact mainly deforms in the radial direction. Then, after the reaction force generating member 21 is fixed to the support portion 31d ', the force that the deformed portion of the leg portion 21-4 tries to return to the original shape acts on the radially outer side of the leg portion 21-4. As a result, also in the fifth embodiment, as in the case of the fourth embodiment, the lower surface of the base portion 21-3, that is, the plane opposite to the dome portions 21w1 and 21b1, is the installation surface (upper surface) of the support portion 31d ′. The reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d ′.

  In the fifth embodiment, the extending direction of the inner side surface In1 is parallel to the direction of the axis Yk of the leg 21-4, and the extending direction of the inner side surface In2 is the plate thickness direction Dp of the support portion 31d ′. Parallel. However, also in the fifth embodiment, the extending directions of the inner side surfaces In1 and In2 can be changed as in the first to third modifications of the second embodiment (see FIGS. 6A to 6C). is there. That is, the inner side surface In1 extends downward from the upper surface position of the support portion 31d ′ in contact with the inner peripheral surface of the through hole 31d2 ′ so as to incline radially outward from the direction of the axis Yk. Also good. Further, the inner side surface In2 may be extended downwardly from the upper surface position of the support portion 31d ′ in contact with the inner peripheral surface of the through hole 31d2 ′ so as to incline radially outward from the direction of the straight line Lp. Good. Further, the inner side surface In1 extends downward from the upper surface position of the support portion 31d ′ that contacts the inner peripheral surface of the through hole 31d2 ′, inclining radially outward from the direction of the axis Yk, Further, the inner side surface In2 may be extended downwardly from the upper surface position of the support portion 31d ′ in contact with the inner peripheral surface of the through hole 31d2 ′ so as to incline radially outward from the direction of the straight line Lp. .

f. Sixth Embodiment Next, a sixth embodiment in which through holes 31d3 ′ different from the through holes 31d1 ′ and 31d2 ′ of the fourth and fifth embodiments are provided in the support portion 31d ′ will be described with reference to FIG. To do. The through hole 31d3 ′ in the sixth embodiment is configured as follows. The shape of the through hole 31d3 ′ at the intermediate position between the upper surface position (that is, the entry side position of the leg portion 21-4) and the lower surface position (that is, the protruding side position of the leg portion 21-4) of the support portion 31d ′ is the leg portion 21−. 4 is a circle centered on the axial center Yk, and its inner diameter is slightly smaller than the outer diameter of the cylindrical portion of the leg 21-4. Further, the shapes of the through holes 31d3 ′ at the upper surface position and the lower surface position of the support portion 31d ′ are also circular, but the inner diameter thereof is larger than the inner diameter at the intermediate position, and the center thereof is the axis of the leg portion 21-4. Different from Yk. The upper part of the inner side surface of the through hole 31d3 ′ is formed in a truncated cone shape whose inner diameter increases from the intermediate position upward, and the lower part of the inner side surface of the through hole 31d3 ′ decreases from the intermediate position downward. It is formed in a truncated cone shape with an increased inner diameter.

  The inclination angle of the inner surface of the through hole 31d3 'is set as follows. In this case, a straight line in the plate thickness direction Dp passing through the center position of the through hole 31d3 'at the intermediate position of the support portion 31d' is defined as Lp. Further, an angle formed by the axis Yk of the leg 21-4 and the straight line Lp is defined as θp3. Also in this case, the axis Yk of the leg 21-4 is parallel to the axes Yw and Yb of the dome portions 21w1 and 21b1, and the straight line Lp is the same as the plate thickness direction Dp. As described in the fourth and fifth embodiments, the angle θp1 formed by the lower surface of the base portion 21-3 and the plane perpendicular to the axes Yw and Yb of the dome portions 21w1 and 21b1, and the axes Yw and Yb and the support portion It is equal to the angle θp2 formed by the plate thickness direction Dp of 31d ′. In FIG. 11, P1 indicates a plane parallel to the upper surface of the base portion 21-3, that is, a plane orthogonal to the axes Yw and Yb.

  Also in this case, a plane including the axis Yk and the straight line Lp is assumed. Then, in the upper part of the through hole 31d3 ′ above the intermediate position, the axis Yk is supported by a pair of inner side surfaces (that is, a pair of straight lines) intersecting the assumed plane and the inner side surface of the through hole 31d3 ′. An inner surface (an inner surface on the upper left side in the drawing) on the side inclined with respect to the straight line Lp above the intermediate position of the portion 31d ′ is referred to as In11. Further, the other inner surface of the pair of inner surfaces, that is, the inner surface on the side where the straight line Lp is inclined with respect to the axis Yk above the intermediate position of the support portion 31d ′ (upper right side in the figure) (Inside surface) of In21. The extending direction of the inner surface In11 is parallel to the axis Yk and extends outward from the intermediate position with respect to the straight line Lp (plate thickness direction Dp). On the other hand, the extending direction of the inner surface In21 is parallel to the straight line Lp, that is, the plate thickness direction Dp of the support portion 31d '.

  Further, below the intermediate position of the through hole 31d3 ′, the axis Yk is supported by the axis Yk among a pair of inner side surfaces (that is, a pair of straight lines) intersecting the assumed plane and the inner side surface of the through hole 31d3 ′. An inner surface (an inner surface on the lower right side in the drawing) on the side inclined with respect to the straight line Lp below the intermediate position of the portion 31d ′ is In12. The other inner surface of the pair of inner surfaces, that is, the inner surface on the side where the straight line Lp is inclined with respect to the axis Yk below the intermediate position of the support portion 31d ′ (lower left side in the figure) The inner surface) is In22. The extending direction of the inner surface In12 is parallel to the axis Yk and extends outward from the intermediate position downward with respect to the straight line Lp (plate thickness direction Dp). On the other hand, the extending direction of the inner surface In22 is parallel to the straight line Lp, that is, the plate thickness direction Dp of the support portion 31d '. The through hole 31d3 ′ is formed when the key frame 31 is molded with a synthetic resin as described above. In the sixth embodiment, the through hole 31d3 ′ is a plate with the intermediate position as a boundary. It is formed by extracting the mold in the thickness direction Dp. Therefore, the through hole 31d3 'is easily formed by molding. Since other configurations are the same as those of the fourth and fifth embodiments, the same reference numerals as those of the fourth and fifth embodiments are given, and description thereof is omitted.

  Then, in assembling the reaction force generating member 21 to the support portion 31d ′, the plurality of leg portions 21-4 are respectively inserted into the plurality of through holes 31d3 ′ in the same manner as in the fourth and fifth embodiments. Thus, the reaction force generating member 21 is fixed on the support portion 31d ′. In this assembly, the left side surface of the leg portion 21-4 is brought into contact with the inner side surface In11 of the through hole 31d3 ′, and the right side surface of the leg portion 21-4 is brought into contact with the inner side surface In12 of the through hole 31d3 ′. Then, the reaction force generating member 21 is pushed in the directions of the axial centers Yw and Yb and pushed into the support portion 31d ′. As a result, the leg 21-4 does not contact (interfere) with the inner surface of the through hole 31d3 ′ over a long distance (ie, a large area), and extends along the inner surfaces In11 and In12 in the through hole 31d3 ′. It smoothly enters in the direction of the axis Yk.

  Then, the leg portion 21-4 is further pushed into the through hole 31d3 'until the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d'. In this state, as in the case of the fourth and fifth embodiments, the angle θp1 formed by the lower surface of the base portion 21-3 and the plane perpendicular to the axis Yw, Yb of the dome portions 21w1, 21b1 is It is equal to the angle θp2 formed by the axial centers Yw and Yb and the plate thickness direction Dp of the support portion 31d ′ (and the angle θp3 formed by the axial center Yk of the leg portion 21-4 and the straight line Lp). Therefore, the lower surface of the base portion 21-3 is orthogonal to the plate thickness direction Dp and parallel to the upper surface of the support portion 31d ', and the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d'. Further, in this state, the inner diameter of the through hole 31d3 ′ at the intermediate position of the support portion 31d ′ is slightly smaller than the outer diameter of the columnar portion of the leg portion 21-4, so that the reaction force generating member 21 is supported by the support portion 31d ′. Can be fixed to. Furthermore, also in this sixth embodiment, the outer diameter of the portion other than the tip portion of the leg portion 21-4 (the portion that does not contact the inner surface of the through hole 31d3 ′) is the same, and the inner surface of the through hole 31d3 ′ The outer peripheral surface of the leg 21-4 that comes into contact mainly deforms in the radial direction. Then, after the reaction force generating member 21 is fixed to the support portion 31d ', the force that the deformed portion of the leg portion 21-4 tries to return to the original shape acts on the radially outer side of the leg portion 21-4. As a result, also in the sixth embodiment, as in the case of the fourth and fifth embodiments, the lower surface of the base portion 21-3, that is, the plane opposite to the dome portions 21w1 and 21b1 is placed on the support portion 31d ′. The reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d ′ by being in close contact with the surface (upper surface).

  In the sixth embodiment, the extending direction of the inner side surfaces In11 and In12 is parallel to the direction of the axis Yk of the leg 21-4, and the extending direction of the inner side surfaces In21 and In22 is the plate of the support portion 31d ′. Parallel to the thickness direction Dp. However, also in the sixth embodiment, the extending directions of the inner side surfaces In11, In12, In21, and In22 as in Modifications 1 to 3 of the third embodiment (see FIGS. 8A to 8C). Can be changed. That is, the inner side surface In11 extends upwardly from the intermediate position of the support portion 31d ′ contacting the inner peripheral surface of the through hole 31d3 ′, inclining radially outward from the direction of the axis Yk. The side surface In12 may extend downward from the intermediate position of the support portion 31d ′ that contacts the inner peripheral surface of the through hole 31d3 ′, inclining radially outward from the direction of the axis Yk. In addition, the inner surface In21 extends from the intermediate position of the support portion 31d ′ contacting the inner peripheral surface of the through hole 31d3 ′ to the outer side in a radial direction from the direction of the straight line Lp and extends upward. In22 may extend downward from the intermediate position of the support portion 31d ′ contacting the inner peripheral surface of the through-hole 31d3 ′, inclining radially outward from the direction of the straight line Lp. Further, the inner side surfaces In11 and In12 extend upward and downward from the intermediate position of the support portion 31d ′ contacting the inner peripheral surface of the through hole 31d3 ′, inclining radially outward from the direction of the axis Yk. In addition, the inner side surfaces In21 and In22 are inclined upward and downward from the intermediate position of the support portion 31d ′ in contact with the inner peripheral surface of the through hole 31d3 ′ so as to be radially outward from the direction of the straight line Lp. Each may be extended.

g. Seventh Embodiment Next, as in the case of the first to third embodiments, the support portion 31d ″ is inclined with respect to the horizontal, but when forming the through hole 31d1 ″ of the support portion 31d ″, the mold A seventh embodiment in which the drawing direction is a direction different from the plate thickness direction Dp of the support portion 31d ″, for example, the vertical direction in FIG. 12, will be described with reference to FIG. Also in the seventh embodiment, as in the first embodiment, the axial centers Yw and Yb of the dome portions 21w1 and 21b1 and the top portions 21w2 and 21b2 are inclined upward to the left in the figure, and the base portion 21- 3, the left part of the figure is formed thicker than the right part of the figure. The shapes of the dome portions 21w1, 21b1, the top portions 21w2, 21b2, and the leg portions 21-4 are the same as those in the first embodiment. Further, the upper surface and the lower surface of the base portion 21-3 are flat, the axial centers Yw and Yb are orthogonal to the upper surface of the base portion 21-3, and the axial center Yk of the leg portion 21-4 is the axial center. The point parallel to Yw and Yb is also the same as in the case of the first embodiment. Further, the upper and lower surfaces of the support portion 31d ″ are also flat, and the plate thickness of the support portion 31d ″ is uniform as in the case of the first embodiment.

  Also in FIG. 12, a plane that is parallel to the upper surface of the base portion 21-3 (that is, orthogonal to the axial centers Yw and Yb) and intersects the axial centers Yw and Yb at the upper surface of the support portion 31d ″. In this case as well, when the thickness direction of the support portion 31d ″ is Dp, the plane P1 orthogonal to the bottom surface of the base portion 21-3 and the axes Yw and Yb of the dome portions 21w1 and 21b1 Is equal to an angle θp2 formed by the axial centers Yw and Yb and the thickness direction Dp of the support portion 31d ″.

  Also in the seventh embodiment, the support portion 31d ″ is formed with a through hole 31d1 ″, and the through hole 31d1 ″ is configured as follows. The bottom surface position of the support portion 31d ″ (that is, the leg portion 21). The shape of the through-hole 31d1 "at the protrusion side position -4 is a circle centered on the axis Yk of the leg 21-4, and its inner diameter is slightly larger than the outer diameter of the columnar portion of the leg 21-4 Further, the shape of the through hole 31d1 ″ at the upper surface position of the support portion 31d ″ (that is, the position on the entry side of the leg portion 21-4) is also circular, but the inner diameter thereof is larger than the inner diameter of the lower surface position, Is different from the axis Yk of the leg 21-4. The inner side surface of the through hole 31d1 ″ is formed in a truncated cone shape whose inner diameter increases from the bottom to the top.

  The inclination angle of the inner surface of the through hole 31d1 ″ is set as follows. Also in this case, the lower surface of the support portion 31d ″ (that is, the leg portion 21-4 extends through the entire circumference of the through hole 31d1 ″. The straight line in the plate thickness direction Dp passing through the center position of the through hole 31d1 ″ at the plane position in contact with the inner peripheral surface of the plate is defined as Lp. Further, an angle formed by the axis Yk of the leg 21-4 and the straight line Lp is defined as θp3. Also in this case, since the axis Yk of the leg 21-4 is parallel to the axes Yw and Yb of the dome portions 21w1 and 21b1, and the straight line Lp is the same as the plate thickness direction Dp, the angle θp3 is An angle θp1 formed by the lower surface of the base portion 21-3 and a plane orthogonal to the axial centers Yw and Yb of the dome portions 21w1 and 21b1, and an angle θp2 formed by the axial centers Yw and Yb and the plate thickness direction Dp of the support portion 31d ″. Is equal to

  Also in this case, a plane including the axis Yk and the straight line Lp is assumed. Of the pair of inner side surfaces (that is, a pair of straight lines) where the assumed plane and the inner side surface of the through hole 31d1 ″ intersect, the straight line Lp is above the lower surface of the support portion 31d ″ above the axis Yk. The inner side surface (the inner side surface on the left side in the figure) on the side inclined with respect to the side is referred to as In1. The other inner surface of the pair of inner surfaces, that is, the inner surface on the side where the axis Yk is inclined with respect to the straight line Lp above the lower surface of the support portion 31d ″ (the inner surface on the right side in the figure). ) Is defined as In 2. The extending direction of the inner side surface In1 is parallel to the axis Yk and extends outward from the lower side to the upper side in the illustrated die-cutting direction from the lower side to the upper side. The extending direction of In2 is the vertical direction. The through hole 31d1 ″ is formed when the key frame 31 is molded with a synthetic resin as described above, and in this seventh embodiment, The through-hole 31d1 ″ is formed by extracting the molding die in the vertical direction, which is the illustrated die-cutting direction, with the lower surface of the support portion 31d ″ as a boundary. Accordingly, the through-hole 31d1 ″ is easily formed by molding. Since other configurations are the same as those in the first embodiment, the same reference numerals as those in the first embodiment are given, and description thereof is made. Is omitted.

  Then, in assembling the reaction force generating member 21 to the support portion 31d ″, the plurality of leg portions 21-4 are respectively inserted into the plurality of through holes 31d1 ″ and press-fitted as in the case of the first embodiment. Accordingly, the reaction force generating member 21 is fixed on the support portion 31d ″. In this assembly, the reaction force is generated while the illustrated left side surface of the leg portion 21-4 is in contact with the inner surface In1 of the through hole 31d1 ″. The generating member 21 is pushed in the directions of the axial centers Yw and Yb and pushed into the support portion 31d ″. As a result, the leg portion 21-4 contacts the inner surface of the through hole 31d1 ″ over a long distance (that is, a large area) ( Without interfering) and smoothly enters the through hole 31d1 ″ along the inner surface In1 in the direction of the axis Yk.

  Then, the leg portion 21-4 is further pushed into the through hole 31d1 ″ until the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d ″. In this state, as in the case of the first embodiment, the angle θp1 formed by the lower surface of the base portion 21-3 and the plane perpendicular to the axis Yw, Yb of the dome portion 21w1, 21b1 is the axis Yw, Yb. Is equal to the angle θp2 formed by the plate thickness direction Dp of the support portion 31d ″ (and the angle θp3 formed by the axis Yk of the leg portion 21-4 and the straight line Lp). It is perpendicular to the direction Dp and parallel to the upper surface of the support portion 31d ″, and the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d ″. In this state, the lower surface of the support portion 31d ″ Since the inner diameter of the through hole 31d1 ″ is slightly smaller than the outer diameter of the cylindrical portion of the leg portion 21-4, the reaction force generating member 21 can be fixed to the support portion 31d ″. Furthermore, also in this seventh embodiment, the outer diameters of the portions other than the tip portions of the leg portions 21-4 (portions that do not contact the inner surface of the through hole 31d1 ") are the same, and the inner surface of the through hole 31d1" The outer peripheral surface of the leg 21-4 that comes into contact mainly deforms in the radial direction. After the reaction force generating member 21 is fixed to the support portion 31d ″, the force that the deformed portion of the leg portion 21-4 attempts to return to the original shape acts on the radially outer side of the leg portion 21-4. As a result, also in the seventh embodiment, as in the case of the first embodiment, the lower surface of the base portion 21-3, that is, the plane opposite to the dome portions 21w1, 21b1, is the installation surface (upper surface) of the support portion 31d ″. The reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d ″.

  In the seventh embodiment, the extending direction of the inner side surface In1 is made parallel to the direction of the axis Yk of the leg portion 21-4, and the extending direction of the inner side surface In2 is the upper and lower sides that are the illustrated die-cutting direction. However, also in the fourth embodiment, the extending directions of the inner side surfaces In1 and In2 can be changed as in the first to third modifications of the first embodiment (see FIGS. 4A to 4C). is there. That is, the inner side surface In1 is extended from the lower surface position of the support portion 31d ″ contacting the inner peripheral surface of the through hole 31d1 ″ to the upper side, inclined radially outward from the direction of the axis Yk. Also good. Further, the inner side surface In2 extends upwardly from the lower surface position of the support portion 31d ″ that contacts the inner peripheral surface of the through hole 31d1 ″, inclining radially outward from the die-cutting direction that is the vertical direction in the drawing. You may do it. Furthermore, the inner side surface In1 is extended from the lower surface position of the support portion 31d ″ that contacts the inner peripheral surface of the through hole 31d1 ″ to the upper side inclining radially outward from the direction of the axis Yk, In addition, the inner surface In2 extends upwardly from the lower surface position of the support portion 31d ″ that contacts the inner peripheral surface of the through hole 31d1 ″, inclining radially outward from the vertical direction that is the illustrated die-cutting direction. It may be.

h. Eighth Embodiment Next, an eighth embodiment in which a through hole 31d2 ″ different from the through hole 31d1 ″ in the seventh embodiment is provided in the support portion 31d ″ will be described with reference to FIG. The through hole 31d2 ″ in the form is configured as follows. The shape of the through hole 31d2 ″ at the upper surface position of the support portion 31d ″ (that is, the position on the entry side of the leg portion 21-4) is a circle centering on the axis Yk of the leg portion 21-4, and the inner diameter thereof is the leg portion 21. -4 is slightly smaller than the outer diameter of the cylindrical portion. Further, the shape of the through hole 31d2 ″ at the lower surface position of the support portion 31d ″ (that is, the protruding side position of the leg portion 21-4) is also circular, but its inner diameter is larger than the inner diameter of the upper surface position, and its center is the leg. It is different from the axis Yk of the part 21-4. The inner side surface of the through hole 31d2 ″ is formed in a truncated cone shape whose inner diameter increases from the upper side to the lower side.

  The inclination angle of the inner side surface of the through hole 31d2 ″ is set as follows. In this case, the upper surface of the support portion 31d ″ (that is, the leg portion 21-4 extends through the entire circumference of the through hole 31d2). A straight line in the plate thickness direction Dp passing through the center position of the through hole 31d2 "at a plane position in contact with the inner peripheral surface of" is defined as Lp. Further, an angle formed by the axis Yk of the leg 21-4 and the straight line Lp is defined as θp3. Also in this case, the axis Yk of the leg 21-4 is parallel to the axes Yw and Yb of the dome portions 21w1 and 21b1, and the straight line Lp is the same as the plate thickness direction Dp. As described in the seventh embodiment, the angle θp1 formed between the lower surface of the base portion 21-3 and the plane perpendicular to the axial centers Yw and Yb of the dome portions 21w1 and 21b1, and the axial centers Yw and Yb and the support portion 31d ″ 13, P1 indicates a plane parallel to the upper surface of the base portion 21-3, that is, a plane orthogonal to the axes Yw and Yb.

  Also in this case, a plane including the axis Yk and the straight line Lp is assumed. Of the pair of inner side surfaces (that is, a pair of straight lines) where the assumed plane intersects with the inner side surface of the through hole 31d2 ″, the straight line Lp is below the upper surface of the support portion 31d ″ with the axis Yk. The inner side surface (the inner side surface on the right side in the figure) on the side inclined with respect to the side is referred to as In1. The other inner surface of the pair of inner surfaces, that is, the inner surface on the side where the axis Yk is inclined with respect to the straight line Lp below the upper surface of the support portion 31d ″ (the inner surface on the left side in the drawing). ) Is defined as In 2. The extending direction of the inner side surface In1 is parallel to the axial center Yk and extends outward from the up and down direction, which is the illustrated die-cutting direction, from the upper side to the lower side. The extending direction of In2 is the vertical direction. The through hole 31d2 ″ is formed when the key frame 31 is molded with a synthetic resin as described above, and in the eighth embodiment, The through-hole 31d2 ″ is formed by extracting the molding die in the vertical direction, which is the illustrated die-cutting direction, with the upper surface of the support portion 31d ″ as a boundary. Accordingly, the through hole 31d2 ″ is easily formed by molding. Since the other configuration is the same as that in the seventh embodiment, the same reference numerals as those in the seventh embodiment are given, and the description is given. Is omitted.

  Then, in assembling the reaction force generating member 21 to the support portion 31d ″, as in the case of the seventh embodiment, the plurality of leg portions 21-4 are respectively inserted into the plurality of through holes 31d2 ″ and press-fitted. As a result, the reaction force generating member 21 is fixed on the support portion 31d ″. In this assembly, the reaction force is generated while the right side surface of the leg portion 21-4 is in contact with the inner surface In1 of the through hole 31d2 ″. The generating member 21 is pushed in the direction of the axial centers Yw and Yb and pushed into the support portion 31d ″. As a result, the leg portion 21-4 contacts the inner surface of the through hole 31d2 ″ over a long distance (that is, a large area) ( Without interfering), it smoothly enters the through hole 31d2 "along the inner surface In1 in the direction of the axis Yk.

  Then, the leg portion 21-4 is further pushed into the through hole 31d2 ″ until the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d ″. In this state, as in the case of the seventh embodiment, the angle θp1 formed by the lower surface of the base portion 21-3 and the plane perpendicular to the axis Yw, Yb of the dome portion 21w1, 21b1 is the axis Yw, Yb. Is equal to the angle θp2 formed by the plate thickness direction Dp of the support portion 31d ″ (and the angle θp3 formed by the axis Yk of the leg portion 21-4 and the straight line Lp). It is perpendicular to the direction Dp and parallel to the upper surface of the support portion 31d ″, and the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d ″. In this state, the upper surface position of the support portion 31d ″ Since the inner diameter of the through hole 31d2 ″ is slightly smaller than the outer diameter of the columnar portion of the leg portion 21-4, the reaction force generating member 21 can be fixed to the support portion 31d ″. Furthermore, also in the eighth embodiment, the outer diameters of the portions other than the tip portion of the leg portion 21-4 (the portion that does not contact the inner surface of the through hole 31d2 ″) are the same, and the inner surface of the through hole 31d2 ″ The outer peripheral surface of the leg 21-4 that comes into contact mainly deforms in the radial direction. After the reaction force generating member 21 is fixed to the support portion 31d ″, the force that the deformed portion of the leg portion 21-4 attempts to return to the original shape acts on the radially outer side of the leg portion 21-4. As a result, also in the eighth embodiment, as in the case of the seventh embodiment, the lower surface of the base portion 21-3, that is, the plane opposite to the dome portions 21w1, 21b1 is the installation surface (upper surface) of the support portion 31d ″. The reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d ″.

  In the eighth embodiment, the extending direction of the inner side surface In1 is parallel to the direction of the axis Yk of the leg 21-4, and the extending direction of the inner side surface In2 is the vertical direction that is the illustrated die-cutting direction. . However, also in the eighth embodiment, the extending directions of the inner side surfaces In1 and In2 can be changed as in the first to third modifications of the second embodiment (see FIGS. 6A to 6C). is there. That is, the inner side surface In1 is extended downward from the upper surface position of the support portion 31d ″ that contacts the inner peripheral surface of the through hole 31d2 ″, inclining radially outward from the direction of the axis Yk. Also good. Further, the inner side surface In2 extends downwardly from the upper surface position of the support portion 31d ″ that contacts the inner peripheral surface of the through hole 31d2 ″, inclining radially outward from the vertical direction that is the illustrated die-cutting direction. You may do it. Further, the inner side surface In1 is extended from the upper surface position of the support portion 31d ″ contacting the inner peripheral surface of the through hole 31d2 ″ to be inclined downward in the radial direction from the direction of the axis Yk. In addition, the inner surface In2 extends downward from the upper surface position of the support portion 31d ″ that contacts the inner peripheral surface of the through hole 31d2 ″ so as to be inclined radially outward from the vertical direction that is the illustrated die-cutting direction. It may be.

i. Ninth Embodiment Next, a ninth embodiment in which through holes 31d3 ″ different from the through holes 31d1 ″ and 31d2 ″ of the seventh and eighth embodiments are provided in the support portion 31d ″ will be described with reference to FIG. To do. The through hole 31d3 ″ in the ninth embodiment is configured as follows. The upper surface position (that is, the entry side position of the leg portion 21-4) and the lower surface position (that is, the leg portion 21-4) of the support portion 31d ″. The shape of the through hole 31d3 ″ at the intermediate position with respect to the protruding side position is a circle centered on the axis Yk of the leg 21-4, and the inner diameter thereof is larger than the outer diameter of the columnar portion of the leg 21-4. The through holes 31d3 ″ at the upper surface position and the lower surface position of the support portion 31d ″ are also circular in shape, but their inner diameter is larger than the inner diameter at the intermediate position, and the center thereof is the leg portion 21-4. The upper part of the inner side surface of the through hole 31d3 ″ is formed in a truncated cone shape whose inner diameter increases from the intermediate position upward, and the lower part of the inner side surface of the through hole 31d3 ″. Is intermediate It is formed in a truncated cone shape whose inner diameter becomes larger as laid et downward.

  The inclination angle of the inner surface of the through hole 31d3 ″ is set as follows. In this case, the thickness direction Dp passing through the center position of the through hole 31d3 ″ at the intermediate position of the support portion 31d ″. The straight line is Lp, and the angle formed by the axis Yk of the leg 21-4 and the straight line Lp is θp3.In this case, the axis Yk of the leg 21-4 is the axis of the dome parts 21w1, 21b1. Since the straight lines Lp are parallel to the centers Yw and Yb and are the same as the plate thickness direction Dp, the angle θp3 is equal to the lower surface of the base portion 21-3 and the dome as described in the seventh and eighth embodiments. The angle θp1 formed by the planes perpendicular to the axes Yw and Yb of the portions 21w1 and 21b1 and the angle θp2 formed by the axis Yw and Yb and the plate thickness direction Dp of the support portion 31d ″ are respectively equal. In FIG. 14 as well, P1 indicates a plane parallel to the upper surface of the base portion 21-3, that is, a plane orthogonal to the axes Yw and Yb.

  Also in this case, a plane including the axis Yk and the straight line Lp is assumed. The straight line Lp is the support portion of the pair of inner side surfaces (that is, a pair of straight lines) intersecting the assumed plane and the inner side surface of the through hole 31d3 ″ above the intermediate position of the through hole 31d3 ″. An inner side surface (an inner side surface on the upper left side in the figure) on the side inclined with respect to the axis Yk above the intermediate position of 31d ″ is In11. The other of the pair of inner side surfaces is In11. The inner surface, that is, the inner surface (the inner surface on the upper right side in the figure) on the side where the axis Yk is inclined with respect to the straight line Lp above the intermediate position of the support portion 31d ″ is referred to as In21. The extending direction of the inner side surface In11 is parallel to the axis Yk and extends outward from the intermediate position upward in the vertical direction, which is the illustrated die-cutting direction. On the other hand, the extending direction of the inner surface In21 is the vertical direction.

  In addition, a straight line Lp is a support portion of a pair of inner side surfaces (that is, a pair of straight lines) intersecting an assumed plane and an inner side surface of the through hole 31d3 ″ below the intermediate position of the through hole 31d3 ″. The inner side surface (the inner side surface on the lower right side in the drawing) on the side inclined with respect to the axis Yk below the intermediate position of 31d ″ is In12. The other of the pair of inner side surfaces is In12. The inner side surface, that is, the inner side surface (the inner left side surface in the figure) on the side where the axis Yk is inclined with respect to the straight line Lp below the intermediate position of the support portion 31d ″ is In22. The extending direction of the inner side surface In12 is parallel to the axis Yk and extends outward from the intermediate position downward with respect to the vertical direction that is the illustrated die-cutting direction. On the other hand, the extending direction of the inner surface In22 is the vertical direction. The through hole 31d3 ″ is formed when the key frame 31 is molded with a synthetic resin as described above. In the ninth embodiment, the through hole 31d3 ″ is illustrated with the intermediate position as a boundary. It is formed by extracting the mold in the mold cutting direction. Accordingly, the through hole 31d3 ″ is easily formed by molding. The other configurations are the same as those in the seventh and eighth embodiments, and therefore the same reference numerals as those in the seventh and eighth embodiments are used. A description thereof will be omitted.

  Then, in assembling the reaction force generating member 21 to the support portion 31d ″, the plurality of leg portions 21-4 are respectively inserted into the plurality of through holes 31d3 ″ in the same manner as in the seventh and eighth embodiments. Then, the reaction force generating member 21 is fixed on the support portion 31d ″. In this assembly, the illustrated left side surface of the leg portion 21-4 is brought into contact with the inner surface In11 of the through hole 31d3 ″. The reaction force generating member 21 is pushed in the directions of the axial centers Yw and Yb and pushed into the support portion 31d ″ while the right side surface of the leg portion 21-4 is in contact with the inner surface In12 of the through hole 31d3 ″. As a result, the leg 21-4 does not contact (interfere) with the inner surface of the through hole 31d3 ″ over a long distance (ie, a large area), and extends along the inner surfaces In11 and In12 in the through hole 31d3 ″. It smoothly enters in the direction of the axis Yk.

  Then, the leg portion 21-4 is further pushed into the through hole 31d3 ″ until the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d ″. In this state, as in the case of the seventh and eighth embodiments, the angle θp1 formed by the lower surface of the base portion 21-3 and the plane perpendicular to the axis Yw, Yb of the dome portions 21w1, 21b1 is It is equal to the angle θp2 formed by the axial centers Yw and Yb and the thickness direction Dp of the support portion 31d ″ (and the angle θp3 formed by the axial center Yk of the leg portion 21-4 and the straight line Lp). Accordingly, the base portion 21-3. Is perpendicular to the plate thickness direction Dp and parallel to the upper surface of the support portion 31d ″, and the entire lower surface of the base portion 21-3 contacts the upper surface of the support portion 31d ″. In this state, the support portion 31d Since the inner diameter of the through hole 31d3 "at the intermediate position" is slightly smaller than the outer diameter of the columnar portion of the leg 21-4, the reaction force generating member 21 can be fixed to the support 31d ". Further, also in the ninth embodiment, the outer diameters of the portions other than the tip portion of the leg portion 21-4 (the portion not contacting the inner surface of the through hole 31d3 ″) are the same, and the inner surface of the through hole 31d3 ″ is the same as that of the inner surface of the through hole 31d3 ″. The outer peripheral surface of the leg 21-4 that comes into contact mainly deforms in the radial direction. After the reaction force generating member 21 is fixed to the support portion 31d ″, the force that the deformed portion of the leg portion 21-4 attempts to return to the original shape acts on the radially outer side of the leg portion 21-4. As a result, also in the ninth embodiment, as in the case of the seventh and eighth embodiments, the lower surface of the base portion 21-3, that is, the plane opposite to the dome portions 21w1 and 21b1 is placed on the support portion 31d ″. The reaction force generating member 21 can be easily and stably assembled and fixed to the support portion 31d ″ by being in close contact with the surface (upper surface).

  In the ninth embodiment, the extending direction of the inner side surfaces In11 and In12 is parallel to the direction of the axis Yk of the leg 21-4, and the extending direction of the inner side surfaces In21 and In22 is the illustrated die-cutting direction. The vertical direction was used. However, also in the ninth embodiment, the extending directions of the inner side surfaces In11, In12, In21, and In22 as in Modifications 1 to 3 (see FIGS. 8A to 8C) of the third embodiment. Can be changed. That is, the inner side surface In11 extends from the intermediate position of the support portion 31d ″ contacting the inner peripheral surface of the through hole 31d3 ″ to the outside in the radial direction from the direction of the axis Yk and extends upward. The side surface In12 may extend downwardly from the intermediate position of the support portion 31d ″ contacting the inner peripheral surface of the through hole 31d3 ″, inclining radially outward from the direction of the axis Yk. Further, the inner side surface In21 extends upwardly from the intermediate position of the support portion 31d ″ that contacts the inner peripheral surface of the through hole 31d3 ″, inclining radially outward from the vertical direction that is the illustrated die-cutting direction. At the same time, the inner surface In22 extends downward from the intermediate position of the support portion 31d ″ contacting the inner peripheral surface of the through-hole 31d3 ″, inclining radially outward from the vertical direction, which is the illustrated die-cutting direction. You may do it. Further, the inner side surfaces In11 and In12 extend upward and downward from the intermediate position of the support portion 31d ″ contacting the inner peripheral surface of the through-hole 31d3 ″, inclining radially outward from the direction of the axis Yk, respectively. In addition, the inner side surfaces In21 and In22 are inclined radially outward from the middle position of the support portion 31d ″ contacting the inner peripheral surface of the through hole 31d3 ″ with respect to the vertical direction as shown in the drawing direction. You may make it extend respectively upward and downward.

j. Tenth Embodiment Next, a tenth embodiment obtained by modifying a part of the first embodiment (FIG. 3) will be described with reference to FIG. In the tenth embodiment, as in the first embodiment, the axes Yw and Yb of the dome portions 21w1 and 21b1 and the top portions 21w2 and 21b2 are inclined upward on the left side in the figure. The thickness of 21-3 is uniform throughout. Moreover, the point which the upper surface and lower surface of the support part 31d are also planes, and the point that the plate | board thickness of the support part 31d is uniform are the same as the case of the said 1st Embodiment. Also in this case, the pressing direction of the reaction force generating member 21 by the white keys 11w and 11b is the direction of the axial centers Yw and Yb, as in the first embodiment. Therefore, the support portion 31d is provided so that the upper surface and the lower surface of the support portion 31d are orthogonal to the pressing direction of the reaction force generating member 21 by the white key 11w and the black key 11b. That is, the plate thickness direction Dp of the support portion 31d is parallel to the directions of the axial centers Yw and Yb.

  The shapes of the dome portions 21w1, 21b1, top portions 21w2, 21b2, and leg portions 21-4 of the reaction force generating member 21 other than the base portion 21-3, and the shape of the through holes 31d1 in the side support portions 31d are also described in the first embodiment. It is the same as the case of form. However, in the tenth embodiment, since the plate thickness direction Dp of the support portion 31d is the same as the axial direction of the leg portion 21-4, the inner side surface In1 in contact with the outer peripheral surface of the leg portion 21-4 is illustrated in FIG. As shown in FIG. 15, the inner surface on the right side of the through hole 31 d 1 may be used, or the inner surface on the left side of the drawing may be used. Further, since the other configurations are the same as those in the first embodiment, the same reference numerals as those in the first embodiment are used, and the description thereof is omitted.

  Also in the tenth embodiment, the inner surface of the through hole 31d1 extends outward in the vertical direction from the bottom to the top, as in the first embodiment. Therefore, also in this case, the through hole 31d1 is formed by extracting the molding die in the vertical direction, which is the illustrated die-cutting direction, with the lower surface of the support portion 31d as a boundary. The assembly of the reaction force generating member 21 to the support portion 31d is also the same as in the case of the first embodiment. Therefore, also in the tenth embodiment, exactly the same effect as in the first embodiment described above can be obtained.

  In the tenth embodiment as well, as in the first to third modifications of the first embodiment (see FIGS. 4A to 4C), the extending direction of the inner side surfaces In1 and In2 can be changed. is there.

k. Eleventh Embodiment Next, an eleventh embodiment obtained by modifying a part of the second embodiment (FIG. 5) will be described with reference to FIG. In the eleventh embodiment, the thickness of the base portion 21-3 is made uniform throughout as in the tenth embodiment. That is, the support portion 31d is provided so that the upper surface and the lower surface thereof are orthogonal to the pressing direction of the reaction force generating member 21 by the white key 11w and the black key 11b. Other configurations are the same as those in the case of the second embodiment, and therefore, the same reference numerals as those in the case of the second embodiment are given and description thereof is omitted. However, also in the eleventh embodiment, since the plate thickness direction Dp of the support portion 31d is the same as the axial direction of the leg portion 21-4, the inner side surface In1 in contact with the outer peripheral surface of the leg portion 21-4 is shown in FIG. 16 may be the inner surface on the left side of the through hole 31d2 in the drawing, or may be the inner surface on the right side in the drawing.

  Also in the eleventh embodiment, the inner surface of the through hole 31d2 of the support portion 31d extends outward in the vertical direction from the upper side to the lower side, as in the second embodiment. Therefore, also in this case, the through hole 31d2 is formed by extracting the molding die in the vertical direction, which is the illustrated die-cutting direction, with the upper surface of the support portion 31d as a boundary. The assembly of the reaction force generating member 21 to the support portion 31d is also the same as in the case of the second embodiment. Therefore, also in the eleventh embodiment, exactly the same effect as in the second embodiment described above can be obtained.

  In the eleventh embodiment as well, the extending direction of the inner side surfaces In1 and In2 can be changed as in the first to third modifications of the second embodiment (see FIGS. 6A to 6C). is there.

l. Twelfth Embodiment Next, a twelfth embodiment obtained by modifying a part of the third embodiment will be described with reference to FIG. In the twelfth embodiment, the thickness of the base portion 21-3 is made uniform throughout as in the tenth and eleventh embodiments. That is, the support portion 31d is provided so that the upper surface and the lower surface thereof are orthogonal to the pressing direction of the reaction force generating member 21 by the white key 11w and the black key 11b. Since the other configuration is the same as that of the third embodiment, the same reference numerals as those of the third embodiment are given, and the description thereof is omitted. However, also in the twelfth embodiment, the plate thickness direction Dp of the support portion 31d is the same as the axial direction of the leg portion 21-4. Therefore, as shown in FIG. 17, the inner side surface In11 in contact with the outer peripheral surface of the leg 21-4 may be the inner side surface on the right side of the through hole 31d3, or may be the inner side surface on the left side in the drawing. Further, although the inner side surface In12 that is in contact with the outer peripheral surface of the leg 21-4 is the inner side surface on the left side of the through hole 31d3, it may be the inner side surface on the right side in the drawing.

  Also in the twelfth embodiment, the inner surface of the through hole 31d3 in the support portion 31d spreads outward in the vertical direction from the middle position upward and downward, similarly to the second embodiment. . Therefore, also in this case, the through hole 31d2 is formed by extracting the molding die in the vertical direction, which is the illustrated die-cutting direction, with the intermediate position of the support portion 31d as a boundary. The assembly of the reaction force generating member 21 to the support portion 31d is also the same as in the case of the third embodiment. Therefore, also in the twelfth embodiment, exactly the same effect as the third embodiment described above can be obtained.

  Also in the twelfth embodiment, the extending directions of the inner side surfaces In11, In12, In21, and In22 as in Modifications 1 to 3 of the third embodiment (see FIGS. 8A to 8C). Can be changed.

m. Thirteenth Embodiment Next, after the leg portion 21-4 is passed through the through hole 31d1 of the support portion 31d, the leg portion 21-4 is engaged with the lower surface of the support portion 31d of the through hole 31d1. Embodiments will be described. FIG. 18A is a longitudinal sectional view of the reaction force generating member 21 according to the thirteenth embodiment, and FIG. 18B is the tip of the leg portion 21-4 of the reaction force generating member 21 of FIG. FIG.

  In the reaction force generating member 21, an engaging portion 21-4a projecting outward over the entire circumference is provided integrally with the leg portion 21-4 at an intermediate portion near the tip of the leg portion 21-4. Yes. The engaging portion 21-4a is formed in a substantially semicircular longitudinal cross-sectional shape, and the upper end portion, that is, the protruding position on the side opposite to the tip is located in one plane over the entire circumference. This plane is indicated by a two-dot chain line Kp in the figure. In addition, this engaging part 2-4a is formed without some forcing when the reaction force generating member 21 is molded. And in the state which assembled | attached the reaction force generation member 21 to the support part 31d, the engaging part 21-4a contacts over the perimeter of the opening part of the through-hole 31d1 in the lower surface of the support part 31d in the plane Kp position. It is supposed to be. Other configurations are the same as those of the first embodiment, and the same reference numerals are given and the description thereof is omitted.

  Also in the thirteenth embodiment configured as described above, the reaction force generating member 21 is fixed to the support portion 31d by press-fitting the leg portion 21-4 into the through hole 31d1 as in the case of the first embodiment. The However, when the leg portion 21-4 is caused to enter the through hole 31d1, the engaging portion 21-4a of the leg portion 21-4 slightly interferes with the inner peripheral surface of the through hole 31d1, and thus the first embodiment. Compared to the case, it is difficult to slightly penetrate the leg 21-4 through the through hole 31d1. However, since the interference is slight, the reaction force generating member 21 is assembled to the support portion 31d without any problem. And, in the assembled state of the reaction force generating member 21 to the support portion 31d, the lower surface of the base portion 21-3 is in close contact with the upper surface of the support portion 31d as in the first embodiment. It is stably fixed to the support portion 31d.

  In the thirteenth embodiment, the engaging portion 21-4a contacts and engages the lower surface of the support portion 31d over the entire circumference on the outer peripheral side of the through hole 31d1. Therefore, in this case, the leg portion 21-4 is prevented from coming off from the through hole 31d1, and the reaction force generating member 21 is firmly fixed to the support portion 31d. Further, since the upper end of the engaging portion 21-4a contacts the lower surface of the support portion 31d over the entire circumference in the plane Kp and engages with the support portion 31d, the reaction force generating member 21 is connected to the support portion 31d. Fixing is stable.

  As in the thirteenth embodiment, providing the engaging portion 21-4a to the leg portion 21-4 and fixing the reaction force generating member 21 to the support portion 31d means that the leg portion 21-4 is attached to the support portion 31d. The present invention is also applied to the above-described embodiments and modifications in which the inner diameter on the protruding side of the through hole 31d1 is smaller than the inner diameter on the intrusion side so as to be engaged on the protruding side of the provided through hole 31d1. That is, Modifications 1 to 3 of the first embodiment shown in FIGS. 4A to 4C, the fourth embodiment and its modification shown in FIG. 9, and the seventh embodiment shown in FIG. This modification is also applied. This also applies to Modifications 1 to 3 below.

m1. Modification 1
Next, Modification 1 of the thirteenth embodiment will be described with reference to the drawings. FIG. 19A is a longitudinal sectional view of the reaction force generating member 21 according to Modification 1, and FIG. 19B is a view of the distal end portion of the leg portion 21-4 of the reaction force generating member 21 of FIG. It is an enlarged view.

  In the first modification, a projecting portion 31d4 having a triangular cross section projecting downward outside the through hole 31d1 is formed integrally with the support portion 31d on the lower surface of the support portion 31d. The lower end surface of the protrusion 31d4 is a flat surface. The through hole 31d1 is also continuous in the protruding portion 31d4, and the engaging portion 21-4a of the leg portion 21-4 is located at the plane Kp position that is the lower end surface of the protruding portion 31d4, as in the thirteenth embodiment. In this way, the entire surface of the protrusion 31d4 is in contact with the opening of the through hole 31d1 on the lower surface. Other configurations are the same as those in the thirteenth embodiment, and the same reference numerals are given and the description thereof is omitted.

  Also in the modified example 1 configured as described above, as in the case of the thirteenth embodiment, the reaction force generating member 21 is fixed to the support portion 31d by press-fitting the leg portion 21-4 into the through hole 31d1. At the same time, the lower surface of the base portion 21-3 is in close contact with the upper surface of the support portion 31d. Further, the engaging portion 21-4a contacts and engages with the lower surface of the protruding portion 31d4 over the entire circumference on the outer peripheral side of the through hole 31d1. Therefore, according to the first modification, the leg portion 21-4 is prevented from coming off from the through hole 31d1, and the reaction force generating member 21 is firmly and stably fixed to the support portion 31d.

m2. Modification 2
Next, Modification 2 of the thirteenth embodiment will be described. FIG. 20A is a longitudinal sectional view of the reaction force generating member 21 according to the second modification, and FIG. 20B is a front end portion of the leg portion 21-4 of the reaction force generating member 21 of FIG. FIG.

  In the modified example 2, the inner peripheral surface of the lower end portion of the through-hole 31d1 has a concave portion (notched portion) in which the longitudinal cross-sectional shape is cut into a triangular shape over the entire circumference so as to increase in diameter downward. 31d5. In order to form the recess 31d5, it is necessary to perform die cutting in the plate thickness direction Dp of the support portion 31d at the upper end position of the recess 31d5 when the support portion 31d is molded. Then, the engaging portion 21-4a of the leg portion 21-4 extends over the entire circumference in the recess 31d5 at the plane Kp position near the upper end of the engaging portion 21-4a, as in the thirteenth embodiment. In contact. Other configurations are the same as those in the thirteenth embodiment, and the same reference numerals are given and the description thereof is omitted.

  Also in the modified example 2 configured as described above, the reaction force generation member 21 is fixed to the support portion 31d by press-fitting the leg portion 21-4 into the through hole 31d1 as in the case of the thirteenth embodiment. At the same time, the lower surface of the base portion 21-3 is in close contact with the upper surface of the support portion 31d. Further, the engaging portion 21-4a contacts and engages with the recess 31d5 provided on the inner peripheral surface of the through hole 31d1 over the entire circumference. Therefore, according to the second modification, the leg portion 21-4 is prevented from coming off from the through hole 31d1, and the reaction force generating member 21 is firmly and stably fixed to the support portion 31d.

m3. Modification 3
Next, Modification 3 of the thirteenth embodiment will be described. In the second modification, the concave portion (notched portion) 31d5 is formed by cutting the longitudinal cross-sectional shape into a triangular shape over the entire inner peripheral surface of the lower end portion of the through hole 31d1. However, the vertical cross-sectional shape of the recess 31d5 can be other than the triangular shape. For example, as shown in Modification 3 in FIG. 21, a recess (not shown in the lower surface portion of the support portion 31d over the entire outer periphery of the through hole 31d1, having a bottom surface that is a plane parallel to the upper surface and the lower surface of the support portion 31d. A notch 31d6 may be provided to engage the engaging portion 21-4a with the bottom surface of the recess 31d6. In this case, the plane Kp in which the engaging portion 21-4a engages with the support portion 31d is the bottom surface of the concave portion 31d6 as indicated by a two-dot chain line. In order to form the recess 31d6, it is necessary to perform die cutting in the plate thickness direction Dp of the support portion 31d with respect to the plane Kp when the support portion 31d is molded.

n. Fourteenth Embodiment In the first to thirteenth embodiments, the key support portion 32w of the white key 11w is arranged in front of the key support portion 32b of the black key 11b. However, the key support portion 32w of the white key 11w and the key support portion 32b of the black key 11b may be arranged at the same position in the front-rear direction. Next, an eleventh embodiment in which the key support portions 32w and 32b are arranged as described above will be described with reference to the drawings. FIG. 22 is a schematic side view of the keyboard device according to the fourteenth embodiment as viewed from the right, and FIG. 23 is a schematic plan view of the keyboard device.

  In the fourteenth embodiment, the key support portions 32w and 32b configured in the same manner as in the first embodiment are the upper surfaces of the rear portions of the upper plate portion 31a of the key frame 31 and are aligned in the front-rear direction. Has been placed. The springs 34w and 34b are arranged on the upper surface of the intermediate portion of the upper plate portion 31a of the key frame 31 so that the positions in the front-rear direction coincide with each other. A reaction force generating member 21w for the white key 11w and a reaction force generating member 21b for the black key 11b are disposed at an intermediate position in the front-rear direction between the key switches 38w and 38b and the extending portion 11b2. The reaction force generation member 21w is positioned slightly forward of the reaction force generation member 21b. A pressing portion 11w1 is provided on the lower surface of the white key 11w facing the reaction force generating member 21w, and a pressing portion 11b1 is provided on the lower surface of the black key 11b facing the reaction force generating member 21b. .

  The reaction force generating member 21w includes a plurality of dome portions 21w1, a plurality of top portions 21w2, a base portion 21-3w, and a plurality of leg portions 21-4w, and is integrally formed of rubber having elasticity. The base portion 21-3w is configured in the same manner as the base portion 21-3 of the reaction force generating member 21 of the first embodiment, but the white key 11w is placed on the base portion 21-3w. Only a plurality of dome portions 21w1 and a plurality of top portions 21w2 are provided. Moreover, although the some leg part 21-4w is provided in the place suitably, regarding those positions, you may differ from the leg part 21-4 of the said 1st Embodiment. The reaction force generating member 21b includes a plurality of dome portions 21b1, a plurality of top portions 21b2, a base portion 21-3b, and a plurality of leg portions 21-4b, and is integrally formed of rubber having elasticity. The base portion 21-3b is configured in the same manner as the base portion 21-3 of the reaction force generating member 21 of the first embodiment, but the black key 11b is placed on the base portion 21-3b. Only a plurality of dome portions 21b1 and a plurality of top portions 21b2 are provided. Moreover, although the some leg part 21-4b is provided in the location suitably, regarding those positions, you may differ from the leg part 21-4 of the said 1st Embodiment.

  The reaction force generating members 21w and 21b configured as described above are press-fitted with the leg portions 21-4w and 21-4b into the through holes provided in the support portions 31dw and 31db of the upper plate portion 31a of the key frame 31. It is being fixed to support parts 31dw and 31db, respectively. The support portions 31dw and 31db are also configured in the same manner as the support portion 31d of the first embodiment, and the support portions 31dw and 31db are formed with the same through holes as the through holes 31d1 of the first embodiment. The support portions 31dw and 31db are inclined so that their front ends are positioned below the rear end, but the inclination of the support portion 31db is larger than the inclination of the support portion 31db. Thereby, the axial center of dome part 21b1 and top part 21b2 inclines largely ahead rather than the axial center of dome part 21w1 and top part 21b2.

  This is due to the following reason. As described above, in the performance, when the white key 11w is pressed, the amount of downward displacement of the front end of the white key 11w, and when the black key 11b is pressed, the amount of downward displacement of the front end of the black key 11b Need to be almost equal. On the other hand, in the case of the fourteenth embodiment, the rocking shaft Cw of the white key 11w and the rocking shaft Cb of the black key 11b are in the same position in the front-rear direction, and the reaction force generating member 21w for the white key 11w and the black key 11b. The reaction force generating member 21b for use is close. Therefore, the rotation direction of the pressing portion 11b1 of the black key 11b is greatly inclined to the rear side below the rotation direction of the pressing portion 11w1 of the white key 11w. In order for the pressing directions of the pressing portions 11w1 and 11b1 at the reaction force peak of the dome portions 21w1 and 21b1 to coincide with both axial directions of the dome portions 21w1 and 21b1, respectively, the axes of the dome portion 21b1 and the top portion 21b2 This is because it is necessary to incline the heart largely to the front side above the axis of the dome portion 21w1 and the top portion 21b2. Moreover, in order to make the normal line direction of the lower surface of the pressing parts 11w1, 11b1 coincide with both axial directions of the dome parts 21w1, 21b1 at the reaction force peak of the dome parts 21w1, 21b1, the lower surface of the pressing part 11b1 is 11w1 is largely inclined upward in front of the lower surface of 11w1. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

  Also in the fourteenth embodiment configured as described above, the reaction force generating members 21w and 21b are configured in the same manner as the reaction force generating member 21 of the first embodiment, and the leg portions 21-4w and 21-4b and the support portion 31dw. , 31db is the same as the relationship between the leg 21-4 of the first embodiment and the through hole 31d1 provided in the support 31d. Therefore, the effect similar to the said 1st Embodiment is anticipated also by this 14th Embodiment.

  Note that the keyboard device according to the fourteenth embodiment can be modified as in the first to third modifications, the second to thirteenth embodiments, and various modifications thereof.

o. Other Modification Examples and Other Application Examples Next, other modification examples and other application examples of the present invention will be described. In the various embodiments and the modifications thereof, the cross-sectional shape of the leg portions 21-4, 21-4w, 21-4b orthogonal to the axis Yk is circular. However, these cross-sectional shapes may not be circular, but may be oval, oblong, etc. In this case, the cross-sectional shapes of the through holes 31d1 to 31d3, 31d1 ′ to 31d3 ′, 31d1 ″ to 31d3 ″ may be made to correspond to the cross-sectional shapes of the leg portions 21-4, 21-4w, and 21-4b.

  Further, the legs 21-4, 21-4w, and 21-4b may be provided with grooves that are notched from the outer peripheral surface toward the axis Yk and extend along the axis Yk. FIG. 24 (A) is a longitudinal sectional view showing a state in which the leg portion 21-4 enters the through hole 31d1 in the reaction force generating member 21 obtained by deforming the leg portion 21-4 of the first embodiment, and FIG. FIG. 24B is a transverse sectional view taken along line BB in FIG. 24A (that is, a transverse sectional view of the leg portion 21-4 as viewed upward from the vicinity of the lower surface of the support portion 31d). In this modification, four grooves 21-4x that are notched in a triangular shape from the outer peripheral surface of the leg 21-4 toward the axis Yk and extend along the axis Yk are leg portions 21-4. Is provided. In the modified example configured as described above, the outer peripheral surface of a part of the leg portion 21-4 in the axial direction Yk (in this case, the lower surface position of the support portion 31d) continuously extends over the entire circumference of the through hole 31d1. It does not contact the inner surface, but all of the outer peripheral surface of the leg 21-4 excluding the groove 21-4x (notch) contacts the inner surface of the through hole 31d1. That is, the part excluding the notch is the outer peripheral surface. However, as in the case of the first embodiment, the reaction force generating member 21 is also fixed to the support portion 31d by the engagement between the outer peripheral surface of the leg portion 21-4 and the inner side surface of the through hole 31d1. Is done. As a result, also in this modified example, the same effect as that of the first embodiment is expected.

  Further, in place of the groove 21-4x of the modified example, as shown in FIG. 24C, the pair of inner side surfaces are parallel to each other so as to be directed from the outer peripheral surface to the axial center Yk, and the tip is half-finished. One leg 21-4y may be provided in the leg 21-4, which is circular and cut out and extends along the axis Yk. FIG. 24C is a cross-sectional view of the leg 21-4 corresponding to FIG. Further, the number of the grooves 21-4x and 21-4y and the notch shape can be variously changed. Further, the grooves 21-4x and 21-4y are also applied to the modified example of the first embodiment, the second to fourteenth embodiments, and various modified examples thereof.

  In the above-described various embodiments and their modifications, the cross-sectional shape orthogonal to the axial centers Yw and Yb of the dome portions 21w1 and 21b1 is circular. However, this cross-sectional shape is not limited to a circular shape, and is elliptical or oblong. It may be a shape. In this case as well, the dome portions 21w1, 21b1 have a shape in which the radial length is gradually increased toward the lower side over the entire circumferential direction.

  In the above-described various embodiments and their modifications, examples have been described in which the white key 11w and the black key 11b are swung around the rotation axis. However, the present invention is not limited to this, and by providing a plate-like thin portion at the rear ends of the white key 11w and the black key 11b, and supporting the rear end of the thin portion with a support member, the white key 11w and the A hinge-type swing fulcrum that swings the black key 11b may be used.

  In the above-described various embodiments and their modifications, reaction force generating members 21, 21w, and 21b are provided independently of the key switches 38w and 38b. However, instead of this, the key switches 38w, 38b may be configured in the same manner as the reaction force generating members 21, 21w, 21b, and the key switches 38w, 38b may be used as the reaction force generating members. In this case, the dome portions 21w1 and 21b1 have a two-stage configuration including an inner portion and an outer portion, and a cylindrical switch portion with a small amount of deformation is provided between the inner portion and the outer portion. Then, a reaction force that increases against the key press is generated by the deformation of the outer portion, and the contact provided on the substrate is opened and closed by the switch portion, and the reaction force against the key press accompanied by buckling deformation by the deformation of the inner portion. Should be generated.

  In the various embodiments and their modifications, the reaction force generating members 21, 21w, 21b are fixed to the support portions 31d, 31d ′, 31d ″, 31dw, 31db, and the white key 11w and the black key 11b The reaction force generating members 21, 21w, 21b are pressed by the pressing portions 11w1, 11b1, but instead, the reaction force generating members 21, 21w, 21b are fixed to the white key 11w and the black key 11b. A pressing portion is provided at a position facing the reaction force generating members 21, 21w, 21b in the upper plate portion 31a of the key frame 31, and the reaction force generating member 21 is moved by the pressing portion by the swinging of the white key 11w and the black key 11b. However, in this case, the dome portions 21w1, 21b1 and the top portion 21w2 of the reaction force generating members 21, 21w, 21b may be pressed. 21b2, the base portions 21-3, 21-3w, 21-3b and the leg portions 21-4, 21-4w, 21-4b are upside down in the case of the above embodiment. The reaction force generating members 21, 21 w and 21 b need to be separately molded, and the reaction force generating members 21, 21 w and 21 b need to be individually fixed to the white key 11 w and the black key 11 b.

  In the above-described various embodiments and their modifications, the reaction force generating members 21, 21w, and 21b are directly pressed by the white key 11w and the black key 11b. However, the keyboard device in which the rocking body that rocks in conjunction with the rocking of the white key 11w and the black key 11b indirectly presses the reaction force generating members 21, 21w, and 21b is also applied to the keyboard device according to the present invention. A force generator can be applied. That is, a rocking body (for example, a hammer) that rocks in conjunction with the rocking of the white key 11w and the black key 11b is provided. Generation members 21, 21w, and 21b are provided. Also by this, the same effects as those in the above-described various embodiments and their modifications can be expected for the key release operation of the white key 11w and the black key 11b. Alternatively, the reaction force generating members 21, 21w, 21b may be provided on the oscillating body side, and the pressing portion may be provided at a position facing the reaction force generating members 21, 21w, 21b.

  In the above-described various embodiments and their modifications, the reaction force generating members 21, 21w, and 21b are fixed so that the axial centers Yw and Yb of the dome portions 21w1 and 21b1 extend substantially in the vertical direction. Explained. However, the reaction force generating members 21, 21w, and 21b may be fixed so that the axial centers Yw and Yb of the dome portions 21w1 and 21b1 extend in a direction that is not in the vertical direction. For example, the white key 11w and the black key 11b are integrally extended from the vicinity of the swing axes Cw and Cb in a direction (for example, a right angle direction) different from the extending direction (that is, the horizontal direction) of the white key 11w and the black key 11b. The extending member is provided on the white key 11w and the black key 11b so that the extending member swings in a direction substantially perpendicular to the extending direction (for example, a substantially horizontal direction) by pressing the white key 11w and the black key 11b. To. In this case, when the reaction force generating members 21, 21w, 21b are fixed to the extending members or fixed at positions facing the extending members, the axial centers Yw, Yb of the dome portions 21w1, 21b1 are other than the vertical direction. The reaction force generating members 21, 21w, and 21b are fixed so as to be in a direction (for example, a horizontal direction). Also, when a rocking body such as a hammer is used, depending on the rocking direction of the rocking body, the reaction force generating members 21, 21 w 1, 21 b 1 have the axial centers Yw, Yb in directions other than the vertical direction. 21w and 21b are fixed. In short, in the present invention, the reaction force generating members 21, 21w, 21b may be fixed to the support member on the opening side of the dome portions 21w1, 21b1, and the directions of the axial centers Yw, Yb are various other than the vertical direction. Can be considered.

  Furthermore, the reaction force generating device according to the present invention can be applied to operators other than the white key 11w and the black key 11b of the keyboard device. That is, a reaction force is applied to an operation element operated by a hand, a foot, or the like by using the reaction force generating members 21, 21w, and 21b as in the above-described embodiment and modifications. You may do it. The operation element in this case is not limited to the one that oscillates around the oscillation center, and may be an operation element that translates along the axial direction of the dome portion.

11w ... White key, 11b ... Black key, 11w1, 11b1 ... Pressing part, 21, 21w, 21b ... Reaction force generating member, 21w1, 21b1 ... Dome part, 21w2, 21b2 ... Top part, 21-3, 21-3w, 21-3b ... Base part, 21-4, 21-4w, 21-4b ... Leg part, 21-4a ... Engagement part, 31 ... Key frame, 31a ... Upper plate part, 31d, 31d ', 31d ", 31dw , 31db ... support part, 31d1-31d3, 31d1'-31d3 ', 31d1 "-31d3" ... through hole, 31d4 ... projection part, 31d5, 31d6 ... concave part (notch), 32w, 32b ... key support part, 34w, 34b ... Spring, Yb, Yw ... Axis center of the dome (axial direction), Yk ... Axis center of the leg (axial direction), Dp ... Thickness direction, In1, In11, In12, In2, In21, In22 ... Inside , Kp ... engaging surface (plane), Lp ... straight line

Claims (7)

It is integrally formed with an elastic body,
The length in the radial direction is gradually increased from one end in the axial direction toward the other end in the axial direction, and the other end in the axial direction is opened to form a dome shape. A dome part that is elastically deformed by pressing and generates a reaction force according to the amount of elastic deformation;
A base portion connected to the other end portion of the dome portion and extending outwardly and having a surface opposite to the dome portion formed in a plane; and a cross section parallel to the surface of the base portion opposite to the dome portion The shape and size of the base portion are kept the same over a predetermined length along the axial center, and the axial center extends from the surface opposite to the dome portion of the base portion in parallel with the axial direction of the dome portion. A reaction force generating member having a columnar leg portion,
A support member having an installation surface on which the surface of the base portion opposite to the dome portion is installed, a through-hole penetrating from the installation surface to the other surface, and the installation surface being formed in a plane. ,
The reaction force is configured to fix the reaction force generating member to the support member by allowing the leg portion to enter the through-hole and bringing the surface of the base portion opposite to the dome portion into close contact with the installation surface. A generator,
The reaction force generating member is fixed to the support member by contacting an outer peripheral surface of a part of the leg portion in the axial direction with an inner surface of the through hole, and at least a part of the inner surface of the through hole is fixed to the support member. Forming the through-hole so as to extend from a position in contact with the outer peripheral surface of the leg portion to be inclined radially outward from the axial direction of the leg portion; and
In a state before the leg portion enters the through hole, the inner diameter of the through hole at a position in contact with a part of the outer peripheral surface in the axial direction of the leg portion is set to a part in the axial direction of the leg portion. When the reaction force generating member is assembled to the support member, the leg portion is deformed by deformation of a portion of the leg portion that contacts the inner side surface of the through hole. Is held in the through-hole .   2. The reaction force generation according to claim 1, wherein a part of an inner side surface of the through hole extends in a direction of an axial center of the leg portion from a position in contact with an outer peripheral surface of the leg portion. apparatus. Position in contact with the outer peripheral surface of the legs, the installation surface position of the support member, the surface position opposite to the installation surface of the supporting member, or an intermediate position of the surface of the installation surface and the opposite claims Item 3. The reaction force generator according to Item 1 or 2 . The position in contact with the outer peripheral surface of the leg is a surface position on the opposite side to the installation surface of the support member or a position in the vicinity of the surface position on the opposite side.
Extends outward from the axial center portion of the leg and engages the support member at a surface position opposite to the installation surface of the support member or at a position near the surface position on the opposite side. The reaction force generator according to claim 1 or 2 , wherein an engagement portion is provided. The reaction force generation device according to claim 4, wherein the engaging portion contacts and engages with the support member on a single plane on an outer peripheral surface. The reaction force generator according to claim 5 , wherein the one plane is parallel to a surface of the base opposite to the dome portion.   The dome part is pressed in the axial direction by the key operation on the keyboard instrument, gradually elastically deforms from the start of pressing, gradually increases the reaction force as the amount of elastic deformation increases, and the reaction force reaches its peak. The reaction force generator according to any one of claims 1 to 6, wherein the reaction force is rapidly reduced by buckling and then reducing the reaction force rapidly.

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