JP5544802B2 - Keyboard instrument - Google Patents

Description

  The present invention relates to a keyboard instrument such as an electronic piano or an electronic organ.

  Conventionally, in a keyboard instrument such as an electronic piano, as described in Patent Document 1, a pair of arm members are provided on both sides of a rear part of a keyboard cover for covering a keyboard part provided in the instrument body. By extending the pair of arm members rotatably to a pair of mounting shafts provided on both sides of the instrument body, the keyboard cover is vertically moved around the pair of mounting shafts. It is known that it is configured to open and close the keyboard part by rotating it.

JP 05-313653 A

  However, in such a conventional keyboard instrument, when the keyboard lid is rotated about a pair of support shafts and opened, the keyboard lid contacts the rear part of the instrument body, and therefore the keyboard lid is repeatedly opened and closed. Then, there is a problem that the rear part of the musical instrument main body may be damaged when the rear part of the musical instrument main body is distorted or cracked.

  In order to avoid such a problem, it is considered to increase the thickness of the rear part of the instrument body 1 or to provide a reinforcing member so that the rear part of the instrument body has sufficient strength. The rear part of the musical instrument main body is for hiding the inside of the musical instrument main body, and originally does not need to have sufficient strength, which causes an increase in weight and cost.

  The problem to be solved by the present invention is to provide a keyboard instrument that has a simple structure and can prevent breakage of the rear part of the instrument main body against which the keyboard cover abuts even when the opening / closing operation of the keyboard cover is repeated.

In order to solve the above problems, the present invention includes the following components.
According to the first aspect of the present invention, a keyboard lid for covering the keyboard portion is attached to the musical instrument main body containing the keyboard portion so as to be rotatable in the vertical direction around the fulcrum portion, and the keyboard lid is located behind the musical instrument main body. In the keyboard instrument that opens the keyboard unit by being tilted in a state where the keyboard cover is raised on the keyboard cover when the keyboard cover is tilted rearward of the instrument body, the bottom plate of the instrument body A keyboard instrument characterized in that a stopper portion is provided to abut the end surface of the rear end portion in the longitudinal direction of the pair of side plates provided upright on both sides of the keyboard.

According to a second aspect of the present invention, the musical instrument main body is positioned between the pair of side plates and is erected at a front end portion of the bottom plate, and the bottom plate is positioned between the pair of side plates. The keyboard instrument according to claim 1 , further comprising: a rear plate standing upright at a rear end portion of the keyboard instrument.

  The invention according to claim 3 is provided with a plurality of mounting holes for fixing the rear plate by a fastening member inserted from the outer surface toward the rear plate at the rear part of the pair of side plates, 3. The keyboard instrument according to claim 2, wherein the stopper portion is in contact with a portion separated in a vertical direction from a portion corresponding to the plurality of mounting holes on the end surface of the rear end portion of the pair of side plates. It is.

According to a fourth aspect of the present invention, the keyboard cover is formed when the stopper portion is formed to be elastically deformable and the stopper portion is elastically deformed by abutting against the end surfaces of the rear end portions of the pair of side plates. The keyboard instrument according to any one of claims 1 to 3 , wherein a protruding height of the stopper portion is formed so as to maintain a non-contact state with respect to a rear end surface of the instrument body. It is.

  According to the present invention, when the keyboard cover is raised while being tilted rearward of the instrument body, the stopper portions provided on the keyboard cover are brought into contact with the edges of the strongest ends on the rear end surface of the instrument body. With this simple structure, it is possible to suppress distortion and cracks that occur at the rear of the instrument body due to the opening and closing operation of the keyboard cover, so that even if the opening and closing operation of the keyboard cover is repeated for a long period of time, the instrument body It is possible to prevent the rear part from being damaged.

It is the perspective view which showed the state which opened the keyboard cover in one Embodiment of the keyboard musical instrument to which this invention is applied. It is the expanded sectional view which showed the state which closed the keyboard cover in the AA arrow view of FIG. It is the expanded sectional view which showed the state which opened the keyboard cover in FIG. It is the rear view which abbreviate | omitted a part seeing the musical instrument main body of FIG. 2 from back (right side). It is the expansion perspective view which decomposed | disassembled and showed the A section in the musical instrument main body of FIG. 5 shows a cross section of the screw insertion hole in the side plate of FIG. 5 as viewed from the direction of arrows BB, (a) is an enlarged cross-sectional view when an arcuate chamfered portion is provided at the corner portion in the counterbore portion, It is an expanded sectional view at the time of providing an inclined chamfered part in the corner part in the spot facing part. It is the expansion perspective view of the principal part which looked at the keyboard cover of FIG. 1 from the front side (left side). FIG. 4 is an enlarged cross-sectional view of a main part showing a stopper portion in the keyboard instrument of FIG. 3. It is an expansion perspective view which showed the stopper part of FIG. It is the partially broken side view which showed the modification of the cover opening / closing apparatus of a keyboard cover in the keyboard instrument to which this invention is applied.

Hereinafter, an embodiment of a keyboard musical instrument to which the present invention is applied will be described with reference to FIGS.
As shown in FIGS. 1 to 4, the keyboard instrument includes an instrument body 1.

  The musical instrument main body 1 is erected at a bottom plate 2, a front plate 3 provided upright at a front end portion (left end portion in FIG. 2) of the bottom plate 2, and a rear end portion (right end portion in FIG. 2) of the bottom plate 2. And a pair of side plates 5 provided upright on both sides of the bottom plate 2 (left and right sides in FIG. 1), and an upper portion of the pair of side plates 5 located on the rear plate 4 And an upper plate 6 provided on the top.

  In this case, as shown in FIG. 1, the upper plate 6 is opened by cutting out about half of its front side (front side in FIG. 1). The upper plate 6 is provided with a switch portion 7a and a speaker portion 7b. As shown in FIG. 4, the rear plate 4 is disposed between the pair of side plates 5 with its lower part in contact with the rear end surface 2 a of the bottom plate 2.

  As shown in FIGS. 1 to 4, the pair of side plates 5 includes end surfaces 2 b on both sides of the bottom plate 2 (both sides in the left-right direction in FIG. 4), end surfaces (not shown) on both sides of the front plate 3, It is attached to the end surfaces 4b on both sides and the end surfaces 6a on both sides of the upper plate 6, respectively. Thereby, the musical instrument main body 1 is formed in a box shape with the front side (front side in FIG. 1) opened upward.

  As shown in FIGS. 1 to 3, a keyboard portion 8 is provided inside the musical instrument body 1 so as to be exposed upward. The keyboard section 8 includes a white key 8a and a black key 8b, and a number of these white keys 8a and black keys 8b are arranged in a state of being rotatably mounted on a keyboard chassis (not shown). It has become. Further, as shown in FIGS. 1 to 3, a keyboard lid 10 that covers the keyboard portion 8 in an openable and closable manner is attached to the musical instrument body 1 by a lid opening and closing device 11.

  The keyboard lid 10 is rotated in the vertical direction by the lid opening / closing device 11 so as to be disposed on the upper part of the musical instrument main body 1 so as to cover the keyboard part 8 when the musical instrument main body 1 is closed, as shown in FIG. Also, as shown in FIG. 3, the keyboard portion 8 is exposed upward when the instrument body 1 is opened by standing slightly behind the instrument body 1 (right side in FIG. 2). .

  As shown in FIGS. 1 to 3, the lid opening / closing device 11 of the keyboard lid 10 includes a support shaft 12 spanned between a pair of side plates 5 located at the rear end portion in the musical instrument main body 1, and a keyboard lid 10. An arm member 13 attached to both sides of the lower surface of the arm member 13 and rotatably attached to the support shaft 12, and an interlocking gear 14 attached to the arm member 13 and rotating together with the keyboard lid 10 about the support shaft 12, Damper devices 15 provided on the inner surface of the side plate 5 of the musical instrument main body 1 for braking the opening / closing operation of the keyboard lid 10 are provided.

  As a result, the keyboard lid 10 is configured to rotate in the vertical direction together with the arm member 13 and the interlocking gear 14 around the support shaft 12 as shown in FIGS. In this case, as shown in FIGS. 2 and 3, the interlocking gear 14 transmits the opening / closing operation of the keyboard lid 10 to the damper device 15 when the keyboard lid 10 rotates together with the arm member 13 around the support shaft 12. It is configured as follows.

  That is, as shown in FIGS. 2 and 3, the interlocking gear 14 is generally formed in a fan shape, and a tooth portion 14a is provided on the outer peripheral surface thereof. In addition, the interlocking gear 14 is rotatably attached to the support shaft 12 at a main portion thereof. Accordingly, the interlocking gear 14 is configured to rotate about the support shaft 12 as the arm member 13 that rotates together with the keyboard lid 10 rotates.

  As shown in FIGS. 2 and 3, the damper device 15 includes a device main body 16 attached to the inner surfaces of the pair of side plates 5. Although not shown, the device main body 16 is provided with a rotating body that rotates together with the keyboard cover 10 and a braking spring that brakes the rotation of the rotating body. In this case, the rotating body is provided with a gear portion 17 that meshes with the tooth portion 14 a of the interlocking gear 14 and rotates and is exposed to the outside of the apparatus main body 16.

  The braking spring is a coil spring, and one end is attached to the rotating body and the other end is attached to the apparatus main body 16. As a result, the braking spring is in a neutral state when it is in a free state, and when the rotating body rotates in one direction with this neutral state as a boundary, it contracts and deforms and applies a load to the rotating body. When the rotating body rotates in the opposite direction, it is configured to expand and deform to apply a load to the rotating body.

  Thereby, the damper device 15 is in a neutral state at the intermediate position from the closed state of the keyboard cover 10 to the fully opened state, and the brake spring contracts and deforms when the keyboard cover 10 is closed from this intermediate position. A load is applied to the keyboard cover 10, and when the keyboard cover 10 is opened from an intermediate position, the braking spring is expanded and deformed to apply a load to the keyboard cover 10.

  By the way, as shown in FIGS. 4 and 5, when the pair of arm members 13 of the lid opening / closing device 11 is rotated around the support shaft 12, the pair of arm members 13 are formed on both sides of the rear portion of the musical instrument main body 1. A slit hole 18 for rotational movement is provided. That is, as shown in FIG. 5, the slit hole 18 is continuous from the rear portion of the upper plate 6 to the upper portion of the rear plate 4 along each inner surface of the rear portion (right side portion in FIG. 5) of the pair of side plates 5. Is provided.

  In this case, as shown in FIGS. 4 and 5, the rear portion of the instrument body 1 includes a rear plate 4 attached to the rear end surface 2 a of the bottom plate 2 and both sides of the rear plate 4 (both sides in the left-right direction in FIG. 4). And a pair of side plates 5 attached to the side surfaces 2b on both sides of the bottom plate 2, and an upper plate 6 located on the upper end surface 4a of the rear plate 4 and attached between the upper portions of the pair of side plates 5. Yes. Thereby, the slit hole 18 provided in the rear part of the musical instrument main body 1 has both end surfaces 6 a located on the rear part of the upper plate 6 (both sides in the left-right direction in FIG. 4) and both sides located on the upper part of the rear plate 4. It has a configuration in which it is notched in a continuous groove shape across the end surface 4b.

  Further, as shown in FIGS. 4 and 5, the pair of side plates 5 positioned at the rear part of the musical instrument main body 1 includes end faces 4 b on both sides of the rear plate 4 (both sides in the left-right direction in FIG. 4), Screwed to the end faces 6a on both sides (both sides in the left-right direction in FIG. 4) by a plurality of screws 19 and not shown, but also to the end faces 2b on both sides of the bottom plate 2 by screws 19. . Accordingly, the rear portions of the pair of side plates 5 are firmly attached to the bottom plate 2, the rear plate 4, and the upper plate 6.

  In this case, screws 19 are screwed into the end surfaces 4b on both sides of the rear plate 4 and the end surfaces 6a on both sides of the upper plate 6 except for portions corresponding to the slit holes 18, as shown in FIG. A hole 25 is provided. Further, as shown in FIGS. 4 and 5, a plurality of screw insertion holes 20 penetrating from the outside to the inside are provided on the outer side surfaces of the rear portions of the pair of side plates 5. Are provided so as to correspond to the respective screw holes 25 in the end faces 6a on both sides.

  As shown in FIGS. 5 and 6, the screw insertion hole 20 includes an insertion hole portion 20 a into which the screw portion 19 a of the screw 19 is inserted and a counterbore portion 20 b into which the head portion 19 b of the screw 19 is inserted. Yes. In this case, a chamfered portion 21 is provided at a corner portion inside the spot facing portion 20b. The chamfered portion 21 may be formed in a curved surface (R surface) curved in an arc shape as shown in FIG. 6 (a), and an inclined shape as shown in FIG. 6 (b). It may be formed on the surface (C surface).

  Of the plurality of screw insertion holes 20 provided in the side plate 5, the screw insertion holes 20 of the side plate 5 corresponding to the end faces 4b on both sides of the rear plate 4 (both sides in the left-right direction in FIG. 4) are shown in FIG. As shown in FIG. 5, the upper and lower 2 respectively corresponding to the lower portion of the end surface 4 b of the rear plate 4 corresponding to the rear end surface 2 a of the bottom plate 2 and the upper portion of the rear plate 4 located at the lower rear side of the slit hole 18. It is provided in the place.

  Thus, as shown in FIGS. 4 and 5, the rear plate 4 is attached to the pair of side plates 5 and the rear end surface 2 a of the bottom plate 2 with screws 19 in a state of being disposed between the pair of side plates 5. . In this case, the pair of side plates 5 has lower portions attached to the end surfaces 2b on both sides (both sides in the left-right direction in FIG. 4) of the bottom plate 2 by screws 19, and upper portions on both sides of the upper plate 6 (left and right sides in FIG. 4). It is attached to the end face 6a on both sides in the direction by screws 19. As a result, the pair of side plates 5 is firmly fixed to the bottom plate 2, the rear plate 4, and the upper plate 6.

On the other hand, as shown in FIGS. 1 to 4, the keyboard lid 10 has edge portions located on both sides of the rear end surface of the instrument body 1 (both sides in the left-right direction in FIG. 4) when the keyboard lid 10 is opened. A pair of stopper portions 22 that contact each other is provided. That is, as shown in FIGS. 1, 3, and 7 to 9, the pair of stopper portions 22 are arranged on the outer sides between the pair of arm members 13 when the keyboard lid 10 stands up slightly backward. Are attached by screws 22a in the vicinity of the ends on both sides (both sides in the left-right direction in FIG. 7) of the inner surface (upper surface in FIG. 7) of the keyboard lid 10 positioned at the position of the keyboard lid 10.

  Thus, as shown in FIGS. 3 and 8, the pair of stopper portions 22 are rear end portions of the pair of side plates 5 of the musical instrument main body 1 when the keyboard cover 10 stands up slightly backward (see FIG. 3 is configured to come into contact with each end surface 5a located at the right end portion), that is, the end surface 5a at the rear end portion in the longitudinal direction which is the front-rear direction (left-right direction in FIG. 3) of the side plate 5. The pair of stopper portions 22 is made of a material having elasticity such as synthetic rubber such as silicone rubber or natural rubber.

  In this case, as shown in FIGS. 8 and 9, the pair of stopper portions 22 includes a mounting portion 23 attached to the inner surface (left side surface in FIG. 8) of the keyboard lid 10 by screws 22 a and a central portion of the mounting portion 23. And a projection 24 that contacts the rear end surface of the musical instrument main body 1. The protrusion 24 has a tip 24a formed in an arc shape, and is configured to be elastically deformed when the arc-shaped tip 24a is pressed against the rear end face 5a of the side plate 5 of the instrument body 1. Yes.

  For this reason, as shown in FIGS. 4 and 8, the pair of stopper portions 22 is pressed against each end surface 5 a of the rear end portion (right side portion in FIG. 8) of the pair of side plates 5 of the instrument body 1. In order to elastically deform, the protrusion height H1 is set in consideration of the amount of elastic deformation. That is, the protrusion height H1 of the stopper portion 22 is such that when the stopper portion 22 is pressed against the end surface 5a of the rear end portion of the side plate 5 and is most elastically deformed, the rear end surface of the instrument body 1, that is, the pair of side plates. 5 in order to prevent the rear end portion (lower end portion in FIG. 8) of the keyboard lid 10 from contacting the end surface 5a located at the rear end portion 5 and the rear surface of the rear plate 4 (the outer surface on the right side in FIG. 8). It is formed with a protruding height that has a gap S therebetween.

  As a result, as shown in FIG. 8, when the keyboard lid 10 stands up slightly behind the instrument body 1 (right side in FIG. 8) and opens the instrument body 1, the pair of stopper portions 22 Even if it is strongly pressed against each end surface 5a of the rear end portion (right side portion in FIG. 8) of the pair of side plates 5 and elastically deformed, it is located at the rear end surface of the instrument body 1, that is, the rear end portions of the pair of side plates 5. It is comprised so that it may not contact the end surface 5a and the rear surface (the outer surface of the right side in FIG. 8) of the rear plate 4.

  Further, as shown in FIGS. 3 and 8, the pair of stopper portions 22 are provided at predetermined positions on the keyboard lid 10 so as to abut on substantially intermediate positions in the vertical direction of the end surfaces 5 a at the rear ends of the pair of side plates 5. Is provided. That is, as shown in FIG. 4 and FIG. 5, the pair of stopper portions 22 are provided at the rear portion of the side plate 5 and are vertically separated from a plurality of screw insertion holes 20 into which the screws 19 are inserted, for example, the side plate 5. It is provided at a location of the keyboard cover 10 corresponding to a substantially intermediate position between the two screw insertion holes 20 provided in the upper part and the lower part in the rear part.

Next, a case where such a keyboard instrument is used will be described.
In this case, first, the keyboard cover 10 is rotated upward to open the keyboard portion 8 to be exposed. At this time, the front end portion (left end portion in FIG. 2) of the keyboard lid 10 is lifted and the keyboard lid 10 is rotated upward about the support shaft 12 of the lid opening / closing device 11. Then, the arm member 13 of the lid opening / closing device 11 rotates with the interlocking gear 14 around the support shaft 12, and the gear portion 17 of the damper device 15 rotates with the rotation of the interlocking gear 14.

  At this time, since the brake spring of the damper device 15 is deformed so as to expand from the contracted state, the keyboard cover 10 can be opened with a light force. When the keyboard cover 10 is opened to the intermediate position, the brake spring of the damper device 15 is in the neutral state. Thereafter, when the keyboard cover 10 is further opened, the brake spring of the damper device 15 is deformed so as to expand gradually, and a load is applied to the keyboard cover 10, so that the rotation operation of the keyboard cover 10 gradually increases. The keyboard lid 10 is slowly rotated backward to open.

  When the keyboard lid 10 is rotated and completely opened, a pair of arm members 13 provided on both sides of the keyboard lid 10 are supported by the support shaft 12 in the instrument body 1 as shown in FIGS. 1 and 3. In this state, as shown in FIG. 3, the pair of stopper portions 22 provided on the keyboard lid 10 abuts on the end surfaces 5 a located at the rear ends of the pair of side plates 5 of the musical instrument body 1, thereby 10 stands up in a state of being slightly inclined to the rear of the instrument body 1. As a result, as shown in FIGS. 1 and 3, since the keyboard portion 8 is opened, the keyboard portion 8 can be depressed to perform a performance.

  At this time, a load is applied to the keyboard lid 10 by the brake spring of the damper device 15, so that the pair of stopper portions 22 provided on the keyboard lid 10 are end surfaces 5 a positioned at the rear ends of the pair of side plates 5. So that the impact by the keyboard cover 10 can be reduced. Further, at this time, the pair of stopper portions 22 are pressed against the respective end surfaces 5a located at the rear end portions of the pair of side plates 5 of the musical instrument main body 1 and are elastically deformed. The impact on the rear end surface of the instrument main body 1 by the keyboard lid 10 can be absorbed.

  In this case, even if the pair of stopper portions 22 are elastically deformed, the keyboard lid 10 contacts the rear end surface of the instrument body 1, that is, the end surface 5 a located at the rear end portion of the pair of side plates 5 and the rear surface of the rear plate 4. Therefore, the keyboard cover 10 does not damage the rear end surface of the instrument body 1. Further, since the pair of stopper portions 22 is pressed against the end surfaces 5a having the highest strength located at the rear end portions of the pair of side plates 5 of the instrument body 1, the opening and closing operation of the keyboard lid 10 distorts the rear portion of the instrument body 1. And no cracks.

  That is, the pair of side plates 5 has lower portions attached to the end faces 2b on both sides (both sides in the left-right direction in FIG. 4) of the bottom plate 2 by screws 19, and upper portions on both sides of the upper plate 6 (left-right direction in FIG. 4). Are attached to the bottom plate 2, the rear plate 4, and the upper plate 6 by screws 19. For this reason, the end surface 5a of the rear end portion in the longitudinal direction which is the front-rear direction of the side plate 5 is formed with the highest strength in the musical instrument main body 1 to the same degree as the rear end surface 2a of the bottom plate 2. Even if pressed, there is no distortion or cracking.

  Further, as shown in FIG. 3, the stopper portion 22 is provided at a position away from the plurality of screw insertion holes 20 provided at the rear portion of the side plate 5 in the vertical direction, for example, at an upper portion and a lower portion at the rear portion of the side plate 5. Since it is pressed against the end surface 5a located at the rear end portion of the side plate 5 corresponding to a substantially intermediate position between the two screw insertion holes 20, the plurality of screw insertion holes 20 provided in the rear portion of the side plate 5 Even if the strength of the rear portion is reduced, the pair of stopper portions 22 can be pressed against the respective end surfaces 5a located at the rear end portions of the pair of side plates 5 by avoiding the portion where the strength is reduced. Generation | occurrence | production of a distortion and a crack can be prevented in the rear part of the main body 1.

  When the keyboard cover 10 is closed, the upper part of the keyboard cover 10 in FIG. 3 is pulled toward the near side (left side in FIG. 3). Then, the keyboard lid 10 rotates downward about the support shaft 12 of the lid opening / closing device 11. At this time, the arm member 13 of the lid opening / closing device 11 rotates together with the interlocking gear 14 around the support shaft 12, and the gear portion 17 of the damper device 15 rotates as the interlocking gear 14 rotates. Then, since the brake spring of the damper device 15 is deformed so as to contract from the expanded state, the keyboard lid 10 can be started to close with a light force.

  When the keyboard lid 10 is closed to the intermediate position, the brake spring of the damper device 15 is in the neutral state. Thereafter, when the keyboard cover 10 is further closed, the brake spring of the damper device 15 is deformed so as to be gradually contracted, and a load is applied to the keyboard cover 10, so that the rotation operation of the keyboard cover 10 becomes gradually heavier. The keyboard lid 10 is slowly rotated and closed. When the keyboard cover 10 is rotated and completely closed, as shown in FIG. 2, the pair of arm members 13 provided on both sides of the keyboard cover 10 are supported by the support shaft 12 in the instrument body 1. As shown in FIG. 2, a keyboard lid 10 is arranged on the upper part of the musical instrument main body 1 to cover the keyboard portion 8.

  As described above, according to this keyboard instrument, when the keyboard lid 10 is erected with the instrument body 1 tilted rearward, the keyboard 22 is provided with the stopper portions 22 that come into contact with the edges of both ends of the rear end portion of the instrument body 1. Since it is provided on the lid 10, the stopper portion 22 provided on the keyboard lid 10 can be brought into contact with the edges of both ends of the musical instrument main body 1 having the highest strength. Therefore, the structure is simple, and even if the opening / closing operation of the keyboard lid 10 is repeated, distortions and cracks generated at the rear of the musical instrument main body 1 can be suppressed, whereby the opening / closing operation of the keyboard lid 10 can be performed over a long period of time. Even if it repeats, breakage of the rear part in the musical instrument main body 1 can be prevented.

  In this case, the instrument body 1 is provided with a bottom plate 2, a pair of side plates 5 provided upright on both sides of the bottom plate 2, and a front plate of the bottom plate 2 positioned between the pair of side plates 5. And the rear plate 4 provided between the pair of side plates 5 and standing at the rear end portion of the bottom plate 2, and the stopper portion 22 is the longitudinal length of the pair of side plates 5. Since the abutting against the end surface 5a of the rear end portion in the direction, the pair of stopper portions 22 can be pressed against the end surface 5a having the highest strength located at the rear end portion in the longitudinal direction of the pair of side plates 5, thereby It is possible to prevent the rear portion of the musical instrument main body 1 from being distorted or cracked by the opening / closing operation 10.

  That is, the rear portions of the pair of side plates 5 are firmly fixed to the bottom plate 2 and the rear plate 4, and the end face 5 a of the rear end portion of the side plates 5 is located in the longitudinal direction that is the front-rear direction of the side plates 5. Therefore, the strength is extremely high in the thickness direction of the side plate 5, and the strength is the highest in the instrument main body 1 as much as the rear end surface 2 a of the bottom plate 2. For this reason, even if the stopper portion 22 is pressed against the end surface 5 a of the side plate 5, the end surface 5 a of the side plate 5 is not distorted or cracked.

  In addition, a plurality of screw insertion holes 20 into which screws 19 for fixing the rear plate 4 are inserted are provided in the rear portions of the pair of side plates 5, and the pair of stopper portions 22 are rear ends of the pair of side plates 5. Since the end surface 5a of the part abuts to a part away from the part corresponding to the plurality of screw insertion holes 20 in the vertical direction, the strength of the rear part of the side plate 5 is reduced by the plurality of screw insertion holes 20 provided in the rear part of the side plate 5 Even so, it is possible to press the pair of stopper portions 22 against the respective end surfaces 5a located at the rear end portions of the pair of side plates 5 by avoiding the portion where the strength is reduced. Generation | occurrence | production of a distortion and a crack can be prevented in the end surface 5a.

  In this case, the screw insertion hole 20 includes an insertion hole portion 20a into which the screw portion 19a of the screw 19 is inserted, and a counterbore portion 20b into which the head portion 19b of the screw 19 is inserted, and the counterbore portion 20b is inserted into the insertion hole. Since the diameter is larger than that of the portion 20a, the strength of the side plate 5 at the spot of the large-diameter counterbore portion 20b is lowered. However, as shown in FIGS. 6 (a) and 6 (b), the corner portion inside the counterbore portion 20b is provided with a chamfered portion 21, so that the screw 19 is tightened by the chamfered portion 21. The concentration of stress due to the applied force can be dispersed, and thereby the strength of the side plate 5 at the spot facing portion 20b can be prevented from further decreasing.

  Further, since the stopper portion 22 is formed of a material having elasticity such as synthetic rubber such as silicone rubber or natural rubber, the pair of stopper portions 22 are positioned at the rear end portions of the pair of side plates 5 of the instrument body 1. When pressed against each end surface 5a, the pair of stopper portions 22 are elastically deformed, so that the impact due to the opening / closing operation of the keyboard lid 10 can be absorbed and the rear surface of the instrument body 1 can be prevented from being damaged. it can.

  In this case, when the protruding height H1 of the pair of stopers 22 abuts against the edges on both sides of the rear end surface of the instrument body 1, that is, the end surface 5a at the rear end of the side plate 5, the keyboard lid 10 is formed at a height that maintains a non-contact state with respect to the rear end surface of the musical instrument main body 1, so that the keyboard lid 10 remains at the rear end surface of the musical instrument main body 1 even when the pair of stopper portions 22 are elastically deformed. Since the end surface 5 a at the rear end portion of the pair of side plates 5 and the rear surface of the rear plate 4 are not contacted, the keyboard cover 10 can be prevented from scratching the rear end surface of the instrument body 1.

  For this reason, in this keyboard instrument, in order to increase the strength of the rear portion of the musical instrument main body 1, the rear plate 4 is formed of a high-strength material, or the thickness of the rear plate 4 is increased, or the rear plate 4 is reinforced. Since there is no need to provide a member, it is possible to prevent an increase in the weight and cost of the entire musical instrument, thereby providing a lightweight and low-priced instrument.

  In the above-described embodiment, the case where the pair of stopper portions 22 is formed of an elastic material such as synthetic rubber such as silicone rubber or natural rubber has been described, but it is not necessarily formed of an elastic material. The structure provided with the elastic deformation part which has the spring property which elastically deforms when contact | abutting to a rear part may be sufficient.

  Further, in the above-described embodiment, the case where the pair of stopper portions 22 are configured to be attached to the keyboard lid 10 as separate members has been described. However, the present invention is not limited thereto, and the pair of stopper portions 22 are respectively integrated with the keyboard lid 10. The structure formed in may be sufficient. In this case, as described above, when the musical instrument main body 1 is in contact with the rear portion, the pair of stopper portions may be provided with an elastic deformation portion having a spring property that elastically deforms. If comprised in this way, while a number of parts can be reduced, the improvement of assembly workability | operativity can be aimed at.

  Further, in the above-described embodiment, the lid opening / closing device 11 for attaching the keyboard lid 10 to the musical instrument main body 1 so as to be openable / closable is supported by the support shaft 12 provided in the musical instrument main body 1 and the support shaft 12. Arm members 13 attached to both sides of the lower surface of the keyboard lid 10, interlocking gears 14 that are respectively attached to the arm members 13 and rotate around the support shaft 12 together with the keyboard lid 10, and the side plate of the instrument body 1 In the above description, the damper device 15 is provided on the inner surface of the drum 5 and brakes the opening / closing operation of the keyboard lid 10. However, the damper device 15 and the interlocking gear 14 are not necessarily provided. For example, you may comprise like the modification shown in FIG.

  That is, the lid opening / closing device 30 of this modification includes a pair of reinforcing plates 31 provided on the inner surfaces of the pair of side plates 5 of the musical instrument body 1 and a pair of support shafts 32 provided on the pair of reinforcing plates 31 respectively. And a pair of arm members 33 that are attached to the pair of support shafts 32 so as to be rotatable in the vertical direction, and are attached to both sides of the lower surface of the keyboard cover 10. In such a lid opening / closing device 30, the pair of arm members 33 rotate in the vertical direction around the pair of support shafts 32 respectively provided on the pair of reinforcing plates 31 in the instrument body 1. The instrument body 1 can be opened and closed by rotating the keyboard lid 10 in the vertical direction.

DESCRIPTION OF SYMBOLS 1 Musical instrument main body 2 Bottom plate 3 Front plate 4 Rear plate 5 A pair of side plates 5a End surface of side plate 6 Upper plate 8 Keyboard part 10 Keyboard lid 11, 30 Lid opening / closing device 12, 32 Support shaft 13, 33 Arm member 18 Slit hole 19 Screw 20 Screw insertion hole 20a Insertion part 20b Counterbore part 21 Chamfering part 22 Stopper part 23 Mounting part 24 Projection part

Claims (4)

A keyboard lid for covering the keyboard portion is attached to the instrument body containing the keyboard portion so as to be rotatable in the vertical direction around the fulcrum portion, and the keyboard lid stands up in a state of tilting rearward of the instrument body. In a keyboard instrument that opens the keyboard part,
When the keyboard lid is raised on the keyboard lid in a state of being inclined rearward of the instrument body, the end surfaces of the rear end portions in the longitudinal direction of the pair of side plates provided to stand on both sides of the bottom plate of the instrument body A keyboard instrument characterized in that a stopper is provided to abut against the keyboard.   The instrument main body is positioned between the pair of side plates and is erected at the front end of the bottom plate, and is positioned between the pair of side plates and is erected at the rear end of the bottom plate. The keyboard instrument according to claim 1, further comprising: a rear plate. The rear portions of the pair of side plates are provided with a plurality of mounting holes for fixing the rear plates by fastening members that are inserted from the outer surfaces thereof toward the rear plates, and the stopper portions are provided with the pair of side plates. in the end face of the rear end portion of the side plate, keyboard instrument according to claim 2, characterized in that the abutment at a location spaced vertically from the point corresponding to the plurality of mounting holes. The stopper portion is formed to be elastically deformable, and when the stopper portion abuts against the end surface of the rear end portion of the pair of side plates and elastically deforms, the keyboard lid is against the rear end surface of the instrument body. The keyboard instrument according to any one of claims 1 to 3 , wherein a protruding height of the stopper portion is formed so as to maintain a non-contact state .

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