JP6011941B2 - Push button switch - Google Patents

Description

  The present invention relates to a push button switch used for, for example, a piano handle type switch, and more particularly to a structure of a return spring of a slide cam therein.

  FIG. 4 shows a configuration (first conventional example) of a push button switch 50 that can also be used for a piano handle type switch. Although not shown, the piano handle type operation handle is rotatably fitted around a bearing portion provided in the vicinity of the end portion in the longitudinal direction (X direction) of the outer peripheral surface of the cover (housing) 53. . The central portion of the casing 53 in the longitudinal direction (X direction) and the width direction (Y direction) protrudes outward in the height direction (Z direction) and is almost always in contact with the inner peripheral surface of the piano handle type operation handle. A push button handle 51 is provided. In the natural state when the load is on as shown in FIG. 4A, the push button handle 51 and the operation handle (not shown) are urged outward in the height direction (Z direction) by the elastic force of the first return spring 52.

  When the user pushes the operation handle into the housing, the push button handle 51 is pushed into the housing 53 as shown in FIG. 4B, and is formed on the bottom side of the slide cam 54 as the push button handle 51 moves. In the figure, the left inclined portion 54 a abuts on the left upper end portion 55 a of the reversing handle 55. When the push button handle 51 is further pushed into the housing 53, the inclined portion 54a of the slide cam 54 presses the upper end portion 55a of the reversing handle 55 downward in the height direction (Z direction), and the slide cam 54 along the inclined surface. Is displaced to the left in the figure. The reversing handle 55 rotates counterclockwise in the figure around an axis 55c parallel to the width direction (Y direction), and finally the reversing handle 55 is reversed as shown in FIG. 4C. As the reversing handle 55 is reversed, the movable plate 58 connected to the lower end of the reversing handle 55 rotates in the clockwise direction in the figure, and the movable contact 56 fixed in the vicinity of the upper end of the movable plate 58 is connected to the terminal plate. It separates from the fixed contact 57 fixed to 59. Thereby, the movable contact 56 and the fixed contact 57 are switched from the contact state to the separation state, and the load is turned off.

  The slide cam 54 is a resin piece integrally formed by inserting a spring piece formed by pressing a metal plate into a mold, and the spring piece has a substantially C shape in plan view. A second return spring 60 in the form of a leaf spring is provided. The second return spring 60 is for returning the slide cam 54 to the natural state shown in FIG. The slide cam 54 is mounted on the inner side of the push button handle 51 so that the projections 51 a formed on the inner side of the top of the push button handle 51 are sandwiched between the two second return springs 60 having a substantially C shape.

  When the user removes his / her finger from the operation handle, the push button handle 51 protrudes outward in the height direction (Z direction) from the cover 53 by the elastic force of the first return spring 52 provided inside the push button handle 51. Be energized. When the push button handle 51 returns to the natural state, the slide cam 54 is separated from the reversing handle 55, and the urging force of the second return spring 60 causes the natural state shown in FIG. 4A, that is, the center position in the longitudinal direction (X direction). Returned to

  When the user pushes the operation handle again toward the housing, the right inclined portion 54b of the slide cam 54 in the drawing contacts the right upper end portion 55b of the reversing handle 55. When the push button handle 51 is further pushed into the housing 53, the inclined portion 54b of the slide cam 54 presses the upper end portion 55b of the reversing handle 55 downward in the height direction (Z direction), and the slide cam 54 is moved along the inclined surface. Is displaced to the right in the figure. The reversing handle 55 rotates in the clockwise direction in the figure around an axis 55c parallel to the width direction (Y direction), and finally the reversing handle 55 is re-reversed as shown in FIG. Is turned on.

  By integrating the slide cam 54 and the second return spring 60 by insert molding, the assembly process of the push button switch 50 can be reduced by one step. However, the structure of the molding die becomes complicated, which necessarily contributes to cost reduction. do not do. In addition, the metal plate must be pressed before insert molding of the slide cam 54 and the second return spring 60, and the part manufacturing process itself is not simplified.

  Patent Document 1 (second conventional example) discloses an integrated first return spring for returning the push button handle to a natural state and a second return spring for returning the slide cam to the center position. Yes. In this case, it is only necessary to press the metal plate, and the assembly process of the push button switch and the part processing process can be simplified. However, the first return spring needs to return not only the push button handle but also the piano handle type operation handle to the natural state at the same time, and the mass of the piano handle type operation handle and the friction of the shaft are large. The spring constant must be increased and the displacement must be increased. On the other hand, the second return spring only returns the slide cam, which is much smaller in mass and friction than the piano handle type operation handle, to the center position. It may be smaller than the spring constant of the return spring. Rather, if the spring constant of the second return spring is too large, the load when the inclined portion of the slide cam comes into contact with the upper end of the reversing handle increases, and the operation feeling of the push button switch becomes heavy. Therefore, when two types of springs having different properties are integrally formed by pressing a metal plate having the same thickness, if the dimensions are slightly different or deformed, the desired spring pressing force will be reduced. Therefore, extremely high processing accuracy and careful handling are required.

JP 2000-197234 A

  The present invention has been made to solve the above-described problems of the conventional example, and aims to reduce the cost of parts of the slide cam and its return spring in the push button switch used for the piano handle switch and to facilitate the handling thereof. Yes.

In order to achieve the above object, a pushbutton switch according to the present invention provides:
A housing,
A plurality of terminal boards provided in the housing and connected to the electric wire;
A fixed contact fixed to one of the plurality of terminal plates;
The end of the casing, which is parallel to the first direction (Y direction) on the bottom side of the casing, is electrically connected to the other one of the plurality of terminal boards, A movable plate rotated about the first axis with the end portion as a first axis;
A movable contact fixed to the movable plate so as to face the fixed contact;
Provided inside the housing and rotated within a predetermined angular range around a second axis parallel to the first direction, the movable plate is rotated along with the rotation, and the movable contact is A reversing handle that switches between a contact state and a non-contact state with the fixed contact;
A push button handle held in the casing so as to be slidable in the second direction, facing the reversing handle in a second direction (Z direction) perpendicular to the bottom surface of the casing;
Provided between the push button handle and the housing in the second direction, and urged to project the push button handle outward from the housing in the second direction with respect to the bottom surface of the housing A first return spring that
In the second direction, it is provided between the push button handle and the reversing handle, and moves in a direction perpendicular to the bottom surface of the housing as the push button handle moves, and the first direction and the second direction A slide cam displaceable in a third direction (X direction) orthogonal to the direction of
A spring piece having a second return spring for returning the slide cam to a central position in the third direction;
In the second direction, the slide cam is positioned between the push button handle and the spring piece, and in this state, the spring piece is fixed to the push button handle, whereby the slide cam and the spring piece are The push button handle is integrated,
The slide cam has inclined portions that come into contact with the reversing handle at both ends in the third direction,
The spring piece has a rectangular opening elongated in the third direction in which the inclined portion of the slide cam protrudes toward the reversing handle.

  The second return spring is configured such that both end portions of the spring piece in the first direction are folded back toward the push button handle in the second direction, and further, a predetermined angle is formed with respect to the first direction. It is preferable that the two leaf springs bend in parallel with each other and press both side surfaces of the slide cam in the third direction.

  Alternatively, the second return spring may be configured such that one end of the spring piece in the first direction is folded back toward the push button handle in the third direction, and further, a predetermined angle with respect to the first direction. It is preferable that the two leaf springs bend in the opposite directions so as to form the same, and press both side surfaces of the slide cam in the third direction.

  The contact portion of the slide cam of the second return spring is preferably curved in a substantially arc shape within a plane defined by the first direction and the third direction.

  According to the present invention, the spring piece having the slide cam and the second return spring is a separate part. Therefore, the mold structure when the slide cam is resin-molded is simplified as compared with the first conventional example. In the assembly process, first, the slide cam is engaged with the spring piece, and the slide cam is held at substantially the center of the spring piece by the pressing force of the two second return springs. Next, since the slide cam and the spring piece are attached to and integrated with the push button handle with the top and bottom of the push button handle inverted, the assembly process is not reduced, but the assembly is facilitated. In addition, in the state where the slide cam, the spring piece and the push button handle are integrated, the second return spring is inside the push button handle and is not exposed to the outside. However, the second return spring is not deformed. In addition, compared with the second conventional example, the spring piece having the second return spring and the first return spring are separate parts, so that it is possible to design an optimal shape using materials according to the respective characteristics. A desired spring pressing force can be obtained by normal processing accuracy and normal handling.

The disassembled perspective view which shows the structural example of the pushbutton switch which concerns on one Embodiment of this invention. The disassembled perspective view which shows the structure of the semi-assembly of the slide cam in the said embodiment, a pushbutton handle, and a spring piece. The perspective view which shows the other structure of the spring piece in the said embodiment. Sectional drawing which shows the structure and operation | movement of the conventional pushbutton switch.

  A push button switch used for a piano handle switch according to an embodiment of the present invention will be described. FIG. 1 shows a configuration of a pushbutton switch 1 with an indicator lamp according to the present embodiment. As shown in FIG. 1, the push button switch 1 has a housing composed of a body 11 and a cover 12 formed of an insulating thermosetting resin such as urea resin. The body 11 is substantially rectangular in plan view, and a substantially rectangular parallelepiped storage space 11a is provided at the center thereof. Moreover, the electric wire insertion hole 11b in which an electric wire is inserted is formed in the both outer sides of the storage space 11a in a longitudinal direction (X direction). Two electric wire insertion holes 11b are formed in each of the width direction (Y direction), and are formed in four places in total. Inside the body 11, a lock spring 13 for pressing the inserted electric wire against the terminal plates 15 and 16 is provided in the vicinity of each electric wire insertion hole 11b. Further, inside the body 11, on the outside of the lock spring 13 in the longitudinal direction (X direction), an unlock button for releasing the lock by the lock spring 13 when the electric wire inserted into the electric wire insertion hole 11b is pulled out. 14 is provided. After the lock spring 13 and the unlock button 14 are stored in the body 11, for example, two terminal plates 15 and 16 are mounted from above in the height direction (Z direction). One terminal plate 16 is provided with a fixed contact 20 constituting a main switching contact portion together with a movable contact 21 described later. A circuit board 17 on which LEDs and the like are further mounted is mounted above the terminal board 16.

  At the bottom of the storage space 11a of the body 11, the transformer 2 held by the holding frame 30 is stored. The upper surface of the holding frame 30 in the height direction (Z direction) constitutes a part of the casing of the switch 1 with an indicator lamp, and drives the movable plate 18 provided with the movable contact 21 and the movable plate 18. The reversing handle 19 and the coil spring 31 that urges the reversing handle 19 in a predetermined direction can be mounted.

  The reversing handle 19 can be swung within a predetermined angle range within a plane defined by the longitudinal direction (X direction) and the height direction (Z direction) around an axis parallel to the width direction (Y direction). is there. The movable plate 18 is electrically connected to, for example, a terminal plate 36 provided on the upper surface of the holding frame 30, and a part of the movable plate 18 is engaged with the reversing handle 19. Then, the movable contact 21 and the fixed contact 20 come into contact with each other according to two postures that the reversing handle 19 can stably take, and the load is turned on. The movable contact 21 and the fixed contact 20 are separated from each other, and the load is turned off. The state is switched to When the reversing handle 19 is attached to the upper surface of the holding frame 30, the cover 12 is attached to the body 11 from above in the height direction (Z direction), and a coil spring (first return spring) is further applied to the upper surface 12a of the cover 12. ) 32 is mounted, and a slide cam 33, a push button handle 34, and a spring assembly 35 are assembled from above, and the push button switch 1 with an indicator lamp is completed. A piano handle type operation handle (not shown) is fitted to one end portion in the longitudinal direction (X direction) of the upper surface 12a of the cover 12, and a bearing portion 12b serving as a rotation axis thereof is formed. . In addition, the height direction (Z direction) here is a height direction in the assembly process of the switch with indicator light 1, and after the switch with indicator light 1 is installed on the construction surface, it is in the X direction and the Z direction. The defined surface is horizontal and the Y direction is vertical.

  FIG. 2 shows a configuration of a semi-assembly of the slide cam 33, the push button handle 34 and the spring piece 35. The push button handle 34 is a substantially rectangular cylindrical body in a plan view, and the side facing the cover 12 is a recess. A fitting protrusion 34b that protrudes downward in the height direction (Z direction) and has a substantially rectangular cross section is formed at the center of the ceiling surface 34a of the push button handle 34. Four bosses 34c and 34d are formed so as to protrude downward in the height direction (Z direction) so as to be point-symmetric with respect to the center of the ceiling surface 34a. For example, the boss 34c and the boss 34d are formed so as to have different planar cross-sectional shapes.

  The slide cam 33 is a substantially rectangular plate-like body in plan view, and a fitting hole 33a to be fitted with the fitting protrusion 34b is formed at the center thereof. The dimension of the fitting protrusion 34b in the width direction (Y direction) is substantially the same as the dimension of the fitting hole 33a, and the dimension of the fitting protrusion 34b is small by a tolerance. On the other hand, since the slide cam 33 is displaced in the longitudinal direction (X direction), the dimension of the fitting protrusion 34b in the longitudinal direction (X direction) is smaller than the dimension of the fitting hole 33a by the amount of displacement. Further, the lower surface of the slide cam 33 in the height direction (Z direction) is the central portion in the width direction (Y direction) and the upper end portion of the reversing handle 19 at both ends in the longitudinal direction (X direction). Two inclined portions 33b are formed in contact with (refer to reference numerals 55a and 55b in the conventional example shown in FIG. 4). The two inclined portions 33b are formed so that the inclined surfaces face each other, and the dimensions of the inclined portions 33b in the width direction (Y direction) are smaller than the dimensions of the other portions of the slide cam 33.

  The spring piece 35 is formed by, for example, pressing a stainless steel plate for a spring, and is a thin plate-like body that is substantially rectangular in plan view. At the center in the longitudinal direction (X direction) and the width direction (Y direction) of the spring piece 35 is a longitudinal direction (X direction: third direction) for the inclined portion 33b of the slide cam 33 to protrude toward the reversing handle 19 side. ) Has a long rectangular opening 35a. The size of the rectangular opening 35a in the width direction (Y direction) is substantially the same as the size of the inclined portion 33b of the slide cam 33, and the size of the rectangular opening 35a is larger by the tolerance. The dimension of the rectangular opening 35a in the longitudinal direction (X direction) is larger than the dimension between the vertical walls of the two inclined portions 33b of the slide cam 33 by the amount of displacement.

  Moreover, the spring piece 35 has the 2nd return spring 40 which returns the slide cam 33 to the center position in a longitudinal direction (X direction). In the configuration example shown in FIG. 2, the second return spring 40 is a push button in the height direction (Z direction: second direction) at both ends 35 b in the width direction (Y direction: first direction) of the spring piece 35. The two leaf springs are folded back to the handle 34 side (that is, the upper side in the figure) and further folded parallel to each other so as to form a predetermined angle with respect to the width direction (Y direction: first direction). The contact portion 40a of the second return spring 40 with the slide cam 33 is in plan view (in the plane defined by the longitudinal direction (X direction: third direction) and the width direction (Y direction: first direction)). It is curved in a substantially arc shape. Thereby, even if the slide cam 33 is displaced in the longitudinal direction (X direction), the second return spring 40 and the slide cam 33 are in line contact with each other, and the pressing force is stabilized.

  Further, around the rectangular opening 35a of the spring piece 35, four openings 35c and 35d having substantially the same shape as the planar cross sections of the boss 34c and the boss 34d are formed at positions facing the boss 34c and the boss 34d of the push button handle 34. Has been. The openings 35c and 35d of the spring piece 35 in the longitudinal direction (X direction) and the width direction (Y direction) are substantially the same as the boss 34c and boss 34d of the push button handle 34, and are larger by a tolerance.

  When assembling the sub-assembly of the slide cam 33, the push button handle 34, and the spring piece 35, first, the top and bottom of the slide cam 33 and the spring piece 35 are in a normal state (the state shown in FIG. 1), and one of the slide cams 33 is inclined. While the portion 33b is fitted to the rectangular opening 35a of the spring piece 35, the side surface 33c of the slide cam 33 on the side in the longitudinal direction (X direction) is brought into contact with the tip of the second return spring 40, and the second return. The spring 40 is elastically deformed. From this state, the other inclined portion 33 b of the slide cam 33 is fitted into the rectangular opening 35 a of the spring piece 35, and the other second return spring 40 is brought into contact with the other side surface 33 c of the slide cam 33. Thus, both side surfaces 33c in the longitudinal direction (X direction) of the slide cam 33 are held by the two second return springs 40, and are held at substantially the center in the longitudinal direction (X direction) by the pressing force of the second return springs 40. Is done. Further, the width direction (Y direction) is guided by the fitting of the inclined portion 33b of the slide cam 33 and the rectangular opening 35a. As a result, the slide cam 33 and the spring piece 35 are substantially integrated.

  Next, the top of the push button handle 34 and the integrated slide cam 33 and the spring piece 35 are reversed, and the opening of the cylindrical body of the push button handle 34 is turned upward so that the fitting protrusion 33 is inserted into the fitting hole 33a of the slide cam 33. 34b is fitted, and the openings 35c and 35d of the spring piece 35 are fitted into the bosses 34c and 34d. In this state, for example, by welding the portions of the bosses 34c and 34d that protrude from the openings 35c and 35d of the spring piece 35 with ultrasonic waves, the slide cam 33, the push button handle 34, and the spring piece 35 are integrated. The Even if it is handled somewhat cluttered in this state, the second return spring 40 is not exposed to the outside because the second return spring 40 is inside the push button handle 34 and is not deformed.

  As described above, according to the configuration of the present embodiment, the spring piece 35 having the slide cam 33 and the second return spring 40 is a separate component. Therefore, the slide cam 33 can be manufactured by simple resin molding, and the structure of the mold when molding can be simplified. In the assembly process, the slide cam 33 held by the spring piece 35 by the two second return springs 40 is attached to and integrated with the push button handle while the top and bottom of the push button handle 34 is reversed. The assembly process is not reduced, but the assembly is facilitated. In addition, since the spring piece 35 having the second return spring 40 and the first return spring (coil spring) 32 are separate parts, it can be designed in an optimum shape using materials according to the respective characteristics. The desired spring pressing force can also be obtained by the above processing accuracy and normal handling. Further, as shown in FIG. 2, as two second return springs 40, both end portions 35 b in the width direction (Y direction) of the spring pieces 35 are folded back in the height direction (Z direction), respectively, and the width direction ( By bending in parallel to each other so as to form a predetermined angle with respect to the (Y direction), the shape of the spring piece 35 becomes point-symmetric with respect to the center in plan view. Therefore, it is not necessary to consider the orientation of the spring piece 35 during assembly, and productivity is improved. Further, since the pressing force of the slide cam 33 by the two second return springs 40 passes through the center of the slide cam 33 in plan view, a rotational moment is generated, but the slide cam 33 is centered in the longitudinal direction (X direction). Easier to hold.

  In addition, this invention is not limited to the structure of the said embodiment, A various deformation | transformation is possible. For example, as shown in FIG. 3, the second return spring 40 of the spring piece 35 is connected to the end 35b in the direction of the width (Y direction) of the spring piece 35 in the height direction (as in the conventional example). It may be folded back in the Z direction) and further in the opposite direction so as to form a predetermined angle with respect to the width direction (Y direction) (substantially C-shaped). In this case, since the shape of the spring piece 35 is axisymmetric with respect to the center in plan view, it is necessary to consider the direction of the spring piece 35 and, further, the slide cam 33 by the two second return springs 40 is taken into consideration. Although the pressing force does not pass through the center of the slide cam 33 in plan view, the spring piece 35 can be engaged only by translating the slide cam 33 in the width direction (Y direction), and assembly is facilitated. In the configuration example shown in FIG. 1, a coil spring is illustrated as the first return spring 32. However, the present invention is not limited to this. For example, a leaf spring having four arms as in the second conventional example. It may be a shape.

1 Pushbutton switch 11 Body (housing)
12 Cover (housing)
15, 16, 36 Terminal plate 18 Movable plate 19 Reversing handle 20 Fixed contact 21 Movable contact 32 Coil spring (first return spring)
33 Slide cam 33a Fitting hole 33b Inclined portion 33c Longitudinal direction (X direction: third direction) 34 Push button handle 34b Fitting protrusion 34c, 34d Boss 35 Terminal piece 35a Rectangular opening 35b Width direction (Y direction: First direction 35c, 35d fitting hole 40 second return spring 40a contact portion with slide cam

Claims (4)

A housing,
A plurality of terminal boards provided in the housing and connected to the electric wire;
A fixed contact fixed to one of the plurality of terminal plates;
The end of the casing, which is parallel to the first direction (Y direction) on the bottom side of the casing, is electrically connected to the other one of the plurality of terminal boards, A movable plate rotated about the first axis with the end portion as a first axis;
A movable contact fixed to the movable plate so as to face the fixed contact;
Provided inside the housing and rotated within a predetermined angular range around a second axis parallel to the first direction, the movable plate is rotated along with the rotation, and the movable contact is A reversing handle that switches between a contact state and a non-contact state with the fixed contact;
A push button handle held in the casing so as to be slidable in the second direction, facing the reversing handle in a second direction (Z direction) perpendicular to the bottom surface of the casing;
Provided between the push button handle and the housing in the second direction, and urged to project the push button handle outward from the housing in the second direction with respect to the bottom surface of the housing A first return spring that
In the second direction, it is provided between the push button handle and the reversing handle, and moves in a direction perpendicular to the bottom surface of the housing as the push button handle moves, and the first direction and the second direction A slide cam displaceable in a third direction (X direction) orthogonal to the direction of
A spring piece having a second return spring for returning the slide cam to a central position in the third direction;
In the second direction, the slide cam is positioned between the push button handle and the spring piece, and in this state, the spring piece is fixed to the push button handle, whereby the slide cam and the spring piece are The push button handle is integrated,
The slide cam has inclined portions that come into contact with the reversing handle at both ends in the third direction,
The push button switch, wherein the spring piece has a rectangular opening elongated in the third direction in which the inclined portion of the slide cam protrudes toward the reversing handle.   The second return spring is configured such that both end portions of the spring piece in the first direction are folded back toward the push button handle in the second direction, and further, a predetermined angle is formed with respect to the first direction. 2. The pushbutton switch according to claim 1, wherein the two leaf springs are bent in parallel to each other and press both side surfaces of the slide cam in the third direction.   The second return spring folds back one end of the spring piece in the first direction toward the push button handle in the third direction, and further forms a predetermined angle with respect to the first direction. 2. The pushbutton switch according to claim 1, wherein the two leaf springs are bent in the opposite directions to press both side surfaces of the slide cam in the third direction.   The contact portion of the slide cam of the second return spring is curved in a substantially arc shape within a plane defined by the first direction and the third direction. The pushbutton switch according to claim 3.

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