JP5282608B2 - Keyboard instrument lid open / close structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save a space of an instrument casing, and to prevent a gear from being exposed to secure smooth and safe opening and closing and maintain good appearance. <P>SOLUTION: A cover 30 includes a front cover 31 and a rear cover 32, which are adjacent in front and behind in closing the covers and superposed on the rear part of a casing of a keyboard instrument 10 in opening the covers. A gear member 18 provided with a rack gear 18a is protruded in a hollow part s formed in a side plate 15 of the keyboard instrument 10. A guide slot 19 is formed in an inside wall 26 of the side plate 15. An interlocking shaft 33 is journaled to the rear end 31a of the front cover 31 in the lateral direction, and both right and left ends 33a, 33b of the interlocking shaft 33 are inserted in hollow parts sL, sR through the guide slots 19, to which pinion gears 35 are secured. The pinion gears 35 mesh with rack gears 18a and roll, thereby the interlocking shaft 33 is moved forward and backward in the guide slots 19 to move the front cover 31 forward and backward. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a lid opening / closing structure for a keyboard musical instrument having a lid that is divided.

  2. Description of the Related Art Conventionally, as shown in Patent Documents 1 and 2 below, a lid opening / closing structure for a keyboard instrument that employs a lid that is divided and configured is known.

  For example, in the structure of Patent Document 1 below, the lid is divided into a front lid and a rear lid, and pinion gears are provided at both left and right ends of the rear portion of the front lid. The pinion gear meshes with a rack gear provided on the left and right inner sides of the musical instrument casing and rolls, so that the front lid slides back and forth.

  On the other hand, in the structure of Patent Document 2 described below, pinion gears are provided at the left and right ends of the rear portion of the rear lid in the divided lid. A rack gear that meshes with the pinion gear is provided in a curved manner so as to protrude rearward and upward in the rear part of the housing. When the front lid is moved rearward, the rear lid descends downward in the housing according to the curvature of the rack gear and rises obliquely.

JP-A-8-263051 JP 2007-102045 A

  However, in the structure of Patent Document 1, the rack gear is exposed and the pinion gear is also exposed when the cover is closed. For this reason, not only is it unsightly and unsafe, but the grease applied to the pinion gear tends to adhere to clothes, etc., and if it sticks, the lubrication effect is diminished and it is difficult to maintain a smooth opening and closing operation for a long period of time. is there.

  On the other hand, in the structure of the above-mentioned Patent Document 2, the front lid is horizontal when the lid is opened, but the rear lid is inclined. Therefore, it is necessary to secure a large space in the rear part of the instrument housing, resulting in waste. become.

  The present invention has been made to solve the above-described problems of the prior art, and its purpose is to save space of the musical instrument casing and to smoothly open and close the door and prevent the gear portion from being exposed and to provide a good appearance. An object of the present invention is to provide a lid opening / closing structure for a keyboard instrument that can maintain the above.

In order to achieve the above object, the lid opening / closing structure of the keyboard instrument according to claim 1 of the present invention is configured to be divided, adjacent to the front and rear when the lid is closed, and overlapped at the rear portion of the casing of the keyboard instrument when the lid is opened. A lid (30) having a front lid (31) and a rear lid (32) to be accommodated, and left and right sides of the casing of the keyboard instrument (10), a left inner surface (15bL) and a left Left side plate portion (15L) in which left side hollow portion (sL) / right side hollow portion (sR) are formed between outer side surface (15aL) and right inner side surface (15bR) and right outer side surface (15aR), respectively. The left rack gear portion (18aL) / the right rack gear formed to extend in the front-rear direction in the right side plate portion (15R) and the left side plate portion / the left side hollow portion of the right side plate portion / the right side hollow portion. Part (18aR) and the rear end of the front lid (31a) An interlocking shaft (33) that is pivotally supported and protrudes left and right, and a left-side pinion gear (35L) / right-side pinion gear (35R) fixed to the left end (33a) / right end (33b) of the interlocking shaft, respectively. The left side guide slot (19L) / the right side guide slot (19R) formed in the left side plate part / the right side plate part, respectively, along the moving direction of the interlocking shaft corresponding to the entire opening / closing process of the lid. And the left end portion / the right end portion of the interlocking shaft pass through the left guide slot / the right guide slot, respectively, and the left pinion gear / the right pinion gear are in the left hollow portion / the right side. The left pinion gear / the right pinion gear meshes with the left rack gear portion / the right rack gear portion by pushing and pulling the front lid, respectively. By rolling, the front cover is configured to slide in the front-rear direction, the left guide slot / the respective in the left inner surface / the right inner side surface of the left side plate portion / the right side plate portion A left projecting portion (17L) / right projecting portion (17R) for concealing the left guide slot / right guide slot in the opened state is provided above the right guide slot, The installation part / right projection part supports the rear end of the rear lid so as to be slidable when the lid is opened and closed .

In order to achieve the above object, the lid opening / closing structure of the keyboard instrument according to claim 2 of the present invention is configured to be divided, adjacent to the front and rear when the lid is closed, and overlapped at the rear part of the casing of the keyboard instrument when the lid is opened. A lid having a front lid and a rear lid to be housed, and left and right sides of the casing of the keyboard instrument, between the left inner side and the left outer side, between the right inner side and the right outer side In the left side plate / right side plate part with the left side hollow part / right side hollow part formed therebetween, and in the left side hollow part / right side hollow part of the left side plate part / right side plate part, respectively, in the front-rear direction. The left rack gear portion / right rack gear portion formed to extend, an interlocking shaft that is pivotally supported by the rear end portion of the front lid and protrudes left and right, and fixed to the left end portion / right end portion of the interlock shaft. Left and right pinion gears / right pinion gears and all lines for opening and closing the lid A left guide slot / right guide slot formed in the left plate / right plate along the moving direction of the interlocking shaft corresponding to the left end / the left end of the interlocking shaft. The right end portion passes through the left guide slot / the right guide slot, and the left pinion gear / the right pinion gear is located in the left hollow section / the right hollow section, and the front lid is pushed and pulled. The left pinion gear / the right pinion gear meshes with the left rack gear portion / the right rack gear portion and rolls so that the front lid slides in the front-rear direction, and the left plate portion / Left cover body (22) / Right cover provided on the right side plate portion so as to be rotatable about a left rotation axis (21) / right rotation axis (21) along the left-right direction, respectively. -The left cover body / the right cover body each have a front portion (22a) that is in contact with the interlocking shaft when the cover is closed. When the cover is opened, the front portion is rotated downward as compared with the closed state, and at least the front half of the left guide slot / the right guide slot is The left cover body / the right cover body are configured to be closed .

Preferably, the portion (22b) in contact with the interlocking shaft in the front portion of the left cover body / right cover body is downward as it moves forward in the entire stroke in which the front portion contacts the interlocking shaft. inclined and, and the first half portion of the left rack gear portion / the right rack gear portion is inclined downward as going forward (claim 3).

Preferably, the casing is provided with a rear lid support portion (17) that supports the rear lid so as to be movable in the front-rear direction, and the front lid is provided with engaging portions (33, 36), The rear lid is provided with engaged portions (34a, 37, 38), and when the front lid moves in the front-rear direction by operation of the front lid, the engagement portion of the front lid and the rear lid When the engaged portion is engaged, the rear lid is configured to move in conjunction with the front lid (claim 4 ).

  In addition, the code | symbol in the said parenthesis is an illustration.

According to the first aspect of the present invention, it is possible to save the space of the musical instrument casing and to maintain a smooth and safe opening and closing and a good appearance without exposing the gear portion. Moreover, the guide groove hole can be concealed to suppress deterioration of the appearance when the lid is opened.

According to the second aspect of the present invention, it is possible to save the space of the musical instrument casing and to maintain a smooth and safe opening and closing and a good appearance without exposing the gear portion. Further , the guide slot is closed when the lid is opened, which can contribute to prevention of foreign matter from entering the hollow portion and improvement of the appearance.

According to the third aspect , the biasing force applied to the interlocking shaft can be applied in the opposite direction in the front-rear direction by the respective weights of the cover body 22 and the front lid 31 to facilitate the design for smooth opening / closing operation. .

According to the fourth aspect , opening and closing operations can be performed only by operating the front lid, and opening and closing operations are facilitated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic right side view of a keyboard instrument to which a lid opening / closing structure according to a first embodiment of the present invention is applied, a diagram showing a closed state (FIG. (A)), and an illustration of a lid being omitted. It is a figure (figure (b)). FIG. 4 is a schematic right side view of the keyboard instrument, showing a state in the middle of the opening process (FIG. (A)), a state of opening the cover (FIG. (B)), and a state in the middle of the closing process (FIG. (C)). FIG. FIG. 3 is a cross-sectional view (FIG. (A)) of the keyboard instrument along the line AA in FIG. 2 (b), and a cross-sectional view (FIG. (B)) of the keyboard instrument along the line BB in FIG. 3 (a). Sectional drawing (figure (a)) corresponding to FIG. 3 (a) of the keyboard musical instrument to which the lid | cover opening / closing structure based on the 2nd Embodiment of this invention is applied, The typical right view of the keyboard musical instrument (figure (a)) (B), (c)). It is sectional drawing (figure (a)) corresponding to Drawing 3 (a) showing a modification of a side board part, and a mimetic diagram (figure (b) and (c)) showing a modification of a lid.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIGS. 1A, 1B, and 2A to 2C are schematic right side views of a keyboard instrument to which the lid opening / closing structure according to the first embodiment of the present invention is applied. . In these drawings, a state in which the right side plate portion 15R is removed from the side plate portions 15 (left side plate portion 15L, right side plate portion 15R) (see FIG. 3B), which will be described later, is shown. In these figures, the left side is the front where the player of the keyboard instrument 10 is located, and the left and right direction of the keyboard instrument 10 is hereinafter referred to as the direction viewed from the player.

  FIG. 3A is a cross-sectional view of the keyboard instrument 10 along the line AA in FIG. FIG. 3B is a cross-sectional view of the keyboard instrument 10 along the line BB in FIG.

  As shown in FIGS. 1 and 2, the lid opening / closing structure of the keyboard instrument 10 includes a lid body 30 including a front lid 31 and a rear lid 32 that are configured separately. Although the keyboard instrument 10 is configured as an electronic keyboard instrument, the lid opening / closing structure of the present invention can also be applied to an acoustic keyboard instrument or a keyboard instrument with legs.

  The casing of the keyboard instrument 10 includes a shelf board 11, a top board 12 and a back board 13 shown in FIGS. 1 and 2, and side plate parts 15 (15L and 15R) and a left front board part shown in FIG. 14L and the right front plate part 14R. As shown in FIGS. 1 and 2, a key frame 16 is disposed on the shelf board 11 in the casing, and a keyboard portion KB composed of a plurality of white keys and black keys is disposed on the key frame 16. Is done. The illustration of electrical / electronic components for generating musical sounds is omitted.

  This lid opening / closing structure is mainly configured by the lid 30 and the left side plate portion 15L and the right side plate portion 15R in the casing. Since this lid opening / closing structure is bilaterally symmetric, when distinguishing left / right components of bilaterally symmetric components, they will be described with reference numerals “L” / “R”, respectively. Hereinafter, the configuration around the side plate portion 15 will mainly be described around the left side plate portion 15L, but the configuration around the right side plate portion 15R is similarly configured.

  The lid 30 is of a front / rear slide type, and when fully opened, the rear lid 32 and the front lid 31 overlap each other and are accommodated in the rear part of the housing. Here, FIG. 1A shows a “closed state” in which the lid 30 is closed, and FIG. 2B shows an “open state” in which the lid 30 is fully opened. FIG. 2A shows a state in the middle of the opening process, and FIG. 2C shows a state in the middle of the closing process. In FIG. 1B, illustration of the lid 30 is omitted.

  As shown in FIGS. 3A and 3B, the left side plate portion 15L is fixed to the shelf plate 11, the top plate 12 and the back plate 13 and corresponds to a side plate or arm of a general keyboard instrument. It is desirable that the thickness is slightly thicker than the side plates or arms. The left side plate portion 15L is integrally formed of a wood material or the like, the left front plate portion 14L is fixed to the front end, and a hollow portion sL is formed between the inner side wall 26L and the outer side wall 27L. The right side surface of the inner side wall 26L and the left side surface of the outer side wall 27L are the inner side surface 15bL and the outer side surface 15aL of the left side plate portion 15L.

  As shown in FIGS. 1, 2, and 3 (b), the front end portion of the front lid 31 is slidable at the position slightly above the keyboard KB on the inner side surface 15 bL of the left side plate portion 15 L when the lid 30 is opened and closed. A front lid support portion 20L is provided to project along the front-rear direction. It does not matter whether the front lid support portion 20L is integral with or separate from the left side plate portion 15L. The rear half of the front lid support portion 20L is horizontal so that the front lid 31 is substantially horizontal in the second half of the opening process, but the front half is inclined downward as it goes forward.

  As shown in FIG. 1A, FIG. 3A, and the like, a guide slot 19L is formed along the front-rear direction on the inner wall 26L of the left side plate portion 15L. As shown in FIG. 1B, the guide slot 19L is provided from the middle of the front half of the left plate 15L to the rear, above the keyboard KB. The guide slot 19L is curved so that the middle portion in the front-rear direction is mainly convex upward, and the rear half is almost horizontal, but the front half is inclined downward as it goes forward.

  As shown in FIGS. 1 (b), 3 (a), 3 (b) and the like, a gear member 18L made of metal or the like protrudes leftward from the inner wall 26L in the hollow portion sL. A rack gear portion 18aL is formed above the gear member 18L. The rack gear portion 18aL is formed over the entire length of the gear member 18L in the front-rear direction. The gear member 18L may be fixedly provided in the hollow portion sL, and may project from the outer wall 27L toward the right. As shown in FIG. 1B, the gear member 18L is provided in parallel to the guide slot 19L at a position slightly below the guide slot 19L. Therefore, the rear half of the gear member 18L is horizontal, but the front half is inclined downward as it goes forward.

  As shown in FIG. 1A, FIG. 3A, and the like, the inner surface 15bL of the left side plate portion 15L has a projecting portion 17L directly above the guide slot 19L and in parallel with the guide slot 19L. Provided. The projecting portion 17L may be integrated with the inner wall 26L, or may be a separate member fixed. The first half of the projecting portion 17L mainly serves to conceal the guide slot 19L from above or from the player side. The projecting portion 17L mainly has a rear half portion wider than the front half portion, and functions to slidably support the rear end portion of the rear lid 32 when the lid 30 is opened and closed.

  The lid 30 is configured as follows. First, a round bar-like interlocking shaft 33 is pivotally supported in the left-right direction at the rear end portion 31a of the front lid 31 (see FIGS. 1A and 3B). As shown in FIG. 3B, the left end portion 33 a and the right end portion 33 b of the interlocking shaft 33 protrude from the front lid 31 to the left and right. Pinion gears 35 (35L, 35R) having teeth corresponding to the teeth of rack gear portion 18a (18aL, 18aR) are fixed to left end portion 33a and right end portion 33b, respectively. Since the interlocking shaft 33 is rotatable with respect to the front lid 31, the pinion gears 35 </ b> L and 35 </ b> R are also rotatable with respect to the front lid 31 together with the interlocking shaft 33. The positions of these teeth are set so that the movement amounts of the pinion gears 35L and 35R relative to the rack gear portions 18aL and 18aR are synchronized. Accordingly, the pinion gears 35L and 35R are always concentric and the interlocking shaft 33 is always parallel to the left-right direction during the entire opening and closing process of the lid 30. Thereby, a smooth opening / closing operation is possible.

  As shown in FIGS. 1 (a), 2 (a) to 2 (c), and FIG. 3 (a), stepped portions 32a are formed along the front-rear direction on the left and right ends of the rear lid 32, respectively. The engagement member 34 (34L, 34R) made of metal or the like is fixed to each stepped portion 32a. The engaging member 34L has a lower end that hangs downward from the stepped portion 32a of the left end portion of the rear lid 32 and extends horizontally to the left, and a portion that extends downward from the left end is close to the left end of the front lid 31. (See FIG. 3 (a)). An engaging groove 34aL is formed along the front-rear direction in the portion extending downward. The engaging member 34R, the engaging groove 34aR (see FIG. 1A) and the configuration around the engaging member 34R are the same as the engaging member 34L in the left-right symmetry.

  Then, the left end 33a and the right end 33b of the interlocking shaft 33 pass through the engagement grooves 34a (34aL, 34aR), respectively. Accordingly, the rear lid 32 and the front lid 31 are always engaged by the engagement of the left end portion 33a and the right end portion 33b of the interlocking shaft 33 with the engagement grooves 34aL and 34aR, and the left end portion 33a and the right end portion 33b are engaged. The rear lid 32 follows the movement of the front lid 31 by engagement with the front and rear ends of the mating grooves 34aL and 34aR.

  As shown in FIGS. 3A and 3B, the left end portion 33a of the interlocking shaft 33 not only penetrates the engagement groove 34aL but also penetrates the guide groove hole 19L and is inserted into the hollow portion sL. Has been. Accordingly, the pinion gear 35L is disposed in a form incorporated in the left side plate portion 15L together with the rack gear portion 18aL. The position of the guide slot 19L and the width in the vertical direction so that the interlocking shaft 33 can smoothly move in the guide slot 19L when the pinion gear 35L meshes with the rack gear 18aL in the entire opening and closing process of the lid 30. Is set. Lubricating grease is applied to the rack gear portion 18aL.

  In the right side plate portion 15R (see FIG. 3B, etc.), the inner side wall 26R, the outer side wall 27R, the inner side surface 15bR, the outer side surface 15aR, the hollow portion sR, the right front plate portion 14R, the front lid support portion 20R, the guide slot 19R. The protruding portion 17R, the gear member 18R, the rack gear portion 18aR, and the pinion gear 35R are the inner side wall 26L, the outer side wall 27L, the inner side surface 15bL, the outer side surface 15aL, the hollow portion sL, the left front plate portion 14L, The front lid support portion 20L, the guide slot 19L, the projecting portion 17L, the gear member 18L, the rack gear portion 18aL, and the pinion gear 35L are similarly configured symmetrically.

  The main part of the lid opening / closing structure of the keyboard instrument 10 is manufactured as follows. First, for the lid 30, the interlocking shaft 33 is attached to the front lid 31, and the engaging members 34 </ b> L and 34 </ b> R are attached to the rear lid 32, and the left end 33 a and the right end 33 b of the interlocking shaft 33 are engaging members 34 </ b> L and 34 </ b> R. The front lid 31 and the rear lid 32 are coupled so as to penetrate the engagement grooves 34aL and 34aR.

  On the other hand, for the left side plate portion 15L and the right side plate portion 15R, the hollow portion s (sL, sR) is formed by punching or molding, and the guide slot 19 is formed, and the front lid support portions 20L, 20R, The projecting portions 17L and 17R and the gear members 18L and 18R are also provided by fixing or the like. The left end portion 33a and the right end portion 33b of the interlocking shaft 33 are inserted into the hollow portions sL and sR from the guide slot 19 (19L and 19R), and the pinion gears 35L and 35R are fixed to the hollow portions sL and sR, respectively. Then, the left front plate portion 14L and the right front plate portion 14R are fixed with screws or an adhesive from the front side of the left side plate portion 15L and the right side plate portion 15R to block the front of the hollow portions sL and sR. The left side plate portion 15L and the right side plate portion 15R are fixed to the shelf plate 11, the top plate 12 and the back plate 13 with screws or the like before or after the left front plate portion 14L and the right front plate portion 14R are fixed. .

  The opening / closing operation of the lid 30 is as follows. First, in the closed state, as shown in FIG. 1 (a), the front cover 31 and the rear cover 32 are adjacent to each other in the front and back to cover the keyboard part KB from above. At this time, the front end portion of the front lid 31 is supported by the left front plate portion 14L and the right front plate portion 14R. The rear end portion 31 a of the front lid 31 is supported by the pinion gear 35 via the interlocking shaft 33, and the front end portion of the rear lid 32 is also supported via the engaging member 34 and the interlocking shaft 33. The rear end portion of the rear lid 32 rides on the projecting portion 17 and is supported.

  Next, when the front lid 31 is operated and pushed backward, the pinion gear 35 meshes with the rack gear portion 18a and rolls on the rack gear portion 18a, and the interlocking shaft 33 engages with the guide groove hole 19 and the rear lid 32. It moves backward in the engaging groove 34a of the combined member 34. Therefore, only the front lid 31 moves backward. At that time, the front end portion of the front lid 31 may be lifted, but may be slid on the front lid support portion 20 (20L, 20R).

  When the interlocking shaft 33 comes into contact with the rear end of the engaging groove 34a of the engaging member 34, the rear cover 32 is driven by the interlocking shaft 33 via the engaging groove 34a, and thereafter, as shown in FIG. As described above, the rear lid 32 moves rearward in conjunction with the front lid 31. Then, when the interlocking shaft 33 comes into contact with the rear end of the guide slot 19, the rear positions of the front lid 31 and the rear lid 32 are restricted and the lid is opened (FIGS. 2B and 3A). reference). Since the front lid 31 and the rear lid 32 overlap with each other in the vertical direction, the front lid 31 and the rear lid 32 are accommodated compactly in the housing. In the opened state, the guide slot 19 is hidden by the projecting portion 17, so that the appearance does not deteriorate.

  Next, when the front lid 31 is pulled forward for closing from the opened state, first, the interlocking shaft 33 moves forward in the guide groove 19 and in the engagement groove 34a of the engagement member 34 of the rear lid 32. Moving. Accordingly, only the front lid 31 moves forward. When the interlocking shaft 33 comes into contact with the front end of the engagement groove 34a, the rear cover 32 is driven by the interlocking shaft 33 via the engagement groove 34a. Thereafter, the rear cover 32 is moved forward in conjunction with the front cover 31. It moves (see FIG. 2C). When the interlocking shaft 33 comes into contact with the front end of the guide slot 19, the front positions of the front lid 31 and the rear lid 32 are restricted, and the lid is closed (see FIG. 1A).

  Incidentally, as described above, the gear member 18 and the guide slot 19 are inclined in the same manner in the side view. As for these, the front portion is inclined from the position substantially the same as the position of the interlocking shaft 33 in the state where the interlocking shaft 33 starts to contact the front end of the engagement groove 34a in the closing stroke (FIG. 2C). It is an area. In the closing process, since the front lid 31 brings the rear lid 32 from the middle, the load of the rear lid 32 is applied. However, since the gear member 18 is inclined downward as it goes forward, the pinion gear 35 easily rolls forward due to the weight of the front lid 31 from the time when the load of the rear lid 32 is applied. Accordingly, an increase in necessary pulling force is suppressed, and the latter half of the closing process can be operated with a relatively light force.

  On the other hand, in the first half of the opening process, it is necessary to raise the rack gear portion 18a and the pinion gear 35. However, as described above, only the front lid 31 moves rearward in the first half of the lid opening process, so that it is not necessary to handle the load of the rear lid 32. Then, when the load of the rear lid 32 is applied in the middle of the opening stroke, the pinion gear 35 almost reaches the horizontal portion of the rack gear portion 18a, so that a sudden increase in the backward pressing force is alleviated. Therefore, the second half of the opening process can be operated with a relatively light force.

  As described above, the opening and closing operations can be performed only by operating the front lid 31, and the change in the load is small in the entire opening and closing process, so that the opening and closing operation is facilitated.

  According to the present embodiment, first, when the lid is opened, the front lid 31 and the rear lid 32 of the divided configuration are overlapped and accommodated in the rear portion of the casing, so that the space of the musical instrument casing can be saved. In particular, the front-rear length of the casing can be shortened without increasing the casing height as compared with a keyboard instrument that employs a lid that is not divided. In addition, since the pinion gear 35 and the rack gear portion 18a are built in the left side plate portion 15L and the right side plate portion 15R and are not exposed, the grease is difficult to adhere to clothes and the like, a lubricating effect is ensured, and a smooth opening and closing operation is performed for a long time. While being able to maintain, a favorable external appearance can be maintained.

  In addition, since the guide slot 19 is concealed by the projecting portion 17, it is possible to suppress deterioration of the appearance when the lid is opened. Furthermore, since the projecting portion 17 is configured integrally with the function of supporting the rear end portion of the rear lid 32 of the lid body 30, a simple configuration is sufficient.

  In addition, as long as it fulfill | performs these both functions, the protrusion part 17 is good also as a structure which isolate | separated the front half part and the latter half part. In particular, when the blindfold function is considered alone, in the opened state, it is only necessary to blind the front half of the guide slot 19 that is not hidden by the lid 30. It should just be. The same applies to the support function of the rear end portion of the rear lid 32, and the function is fulfilled if it is provided mainly in the region corresponding to the rear half of the guide slot 19.

(Second Embodiment)
The second embodiment of the present invention is different from the first embodiment in that a cover body 22 for closing the guide slot 19 is provided in the hollow portion s, and other configurations are the same.

  FIG. 4A is a cross-sectional view corresponding to FIG. 3A of a keyboard instrument to which the lid opening / closing structure according to the second embodiment is applied. 4 (b) and 4 (c) are schematic right side views of the keyboard instrument. 4B and 4C show a state in which the right side plate portion 15R is removed as in FIGS. Further, illustration of the front lid support portion 20 and the projecting portion 17 is also omitted, and the illustration of the lid 30 is omitted, but only the interlocking shaft 33 is shown. FIG. 4B shows a state where the interlocking shaft 33 is in the closed position, and FIG. 4C shows a state where the interlocking shaft 33 is in the middle of opening and closing.

  As shown in FIGS. 4A to 4C, the rotation shaft 21 and the stopper 23 are provided on the inner side wall 26 </ b> L in the hollow portion sL of the left side plate portion 15 </ b> L. The rotation shaft 21 is provided above the guide slot 19L and slightly behind the middle of the guide slot 19L in the front-rear direction. The stopper 23 is provided at a position below the front end portion of the guide slot 19L. A cover body 22 is rotatably attached to the rotation shaft 21. The cover body 22 has a plate shape and is disposed so as to be in sliding contact with the left surface of the inner wall 26L. The cover body 22 has a substantially triangular or fan-shaped shape with the rotation shaft 21 as an apex in a side view, and a lower edge 22b of the cover body 22 is formed in a straight or smooth curved shape.

  In such a configuration, in the closed state (FIG. 4B), the interlocking shaft 33 is positioned at the front end of the guide slot 19L, so that the lower edge 22b of the cover body 22 is supported by the interlocking shaft 33. Thus, the downward rotation position of the front end 22a is restricted.

  When the lid opening operation is performed from the closed state, the interlocking shaft 33 moves rearward, but the lower edge 22b of the cover body 22 always contacts the interlocking shaft 33 until halfway. During this time, that is, in the entire stroke in which the lower edge 22b contacts the interlocking shaft 33, the lower edge 22b maintains a posture in which it is inclined downward as it goes forward. As the interlocking shaft 33 moves backward, the front end portion 22a of the cover body 22 that is in sliding contact with the interlocking shaft 33 is gradually rotated downward.

  Eventually, when the interlocking shaft 33 reaches the position shown in FIG. 4C, the front end portion 22 a of the cover body 22 contacts the stopper 23. Thereafter, until the lid is opened, even if the interlocking shaft 33 is moved rearward by the lid opening operation, the cover body 22 remains in contact with the stopper 23 and the rotational position remains restricted. The posture of 22 does not change.

  In a state where the rotation position of the cover body 22 is regulated by the stopper 23, as shown in FIG. 4C, the front half of the guide slot 19L is closed by the cover body 22. Therefore, naturally, the front half of the guide slot 19L is closed when the lid is opened.

  Although not shown, also in the right side plate portion 15R, the cover body 22, the rotating shaft 21, and the stopper 23 are configured symmetrically with those of the left side plate portion 15L, and the same action occurs.

  Here, as described above, in the entire stroke in which the cover body 22 abuts the interlocking shaft 33, the lower edge 22b is inclined downward as it goes forward. To receive a biasing force. On the other hand, in the stroke in which the cover body 22 abuts on the interlocking shaft 33, the interlocking shaft 33 is almost located in the guide slot 19 or the front half of the rack gear portion 18a, so that the pinion gear 35 is moved forward by the weight of the front lid 31. It becomes easy to roll, and the interlocking shaft 33 receives a biasing force forward.

  As a result, the rearward urging force applied to the interlocking shaft 33 due to the weight of the cover body 22 is relaxed by the weight of the front lid 31, and an increase in the closing operation is suppressed.

  That is, the urging force caused by the weight of the cover body 22 and the urging force caused by the weight of the front lid 31 act so as to cancel each other. If the design is made in consideration of the inclination and shape of the guide slot 19 to the rack gear portion 18a and the inclination and shape of the lower edge 22b so that these urging forces are appropriate, the lid closing operation is mainly facilitated. be able to. For example, by making the inclination of the guide slot 19 and the rack gear portion 18a stronger than in the first embodiment, both biasing forces can be offset well, and the operating force required for the entire stroke in which the cover body 22 is driven is substantially reduced. It can also be designed to be constant.

  According to the present embodiment, not only the same effects as in the first embodiment are obtained, but also the guide slot 19 is closed when the lid is opened to prevent foreign matter from entering the hollow portion s. It can contribute to appearance improvement.

  Furthermore, it is possible to facilitate the design for smooth opening and closing operations by applying the urging forces due to the respective weights of the cover body 22 and the front lid 31 in opposite directions in the front-rear direction.

  In the present embodiment, the cover body 22 may have a position and shape that can close at least the front half of the guide slot 19 when the cover is opened, and is not limited to the illustrated example. For example, in the case of the left side plate portion 15L, the cover body 22 may be provided so as to be in sliding contact with the right surface (inner side surface 15bL) of the inner side wall 26L. In that case, in order to avoid interference with the cover body 22, the projecting portion 17L may be eliminated.

  By the way, in the said 1st, 2nd embodiment, although the side-plate part 15 was comprised as what was corresponded to a side plate thru | or a brace, it is good also as a side-plate part 15 not only that but the part corresponding to a time signature tree. That is, in order to ensure safety and a good appearance, as illustrated in FIG. 5A, the side plate portion 15 is integrally formed, and the rack gear portion 18a and the pinion gear 35 are disposed at a location deeper than the inner side surface. In other words, it may be configured not to be exposed.

  Fig.5 (a) is sectional drawing corresponding to Fig.3 (a) which shows the modification of a side-plate part. As illustrated in FIG. 5A, the left side plate portion 15 </ b> L includes a first member 24 and a second member 25. The first member 24 has a hollow portion sL that opens to the right, and a rack gear portion 18a is directly formed on the bottom surface of the hollow portion sL. Or you may adhere to the member (equivalent to the gear member 18L) in which the rack gear part 18a was formed in the bottom face of the hollow part sL. The second member 25 is fixed to the right surface of the first member 24. The right surface of the second member 25 is the inner side surface 15bL of the left side plate portion 15L. The second member 25 corresponds to the inner wall 26L (see FIG. 3A) of the left side plate portion 15L in the first embodiment, and the guide slot 19L is formed in the second member 25. Other configurations are the same as those of the first embodiment.

  Further, in each of the above embodiments, the rear lid 32 moves back and forth in conjunction with the movement of the front lid 31, and both the opening and closing operations can be performed only by operating the front lid 31. The engagement between the lids is not limited to that by the interlocking shaft 33 and the engagement groove 34a (see FIG. 1A) of the engagement member 34. Moreover, you may reverse the up-and-down relationship of the lamination | stacking of the front cover 31 and the rear cover 32. FIG.

  For example, as shown in a schematic diagram of a modified example of the lid body 30 in FIG. 5B, the engaging portion 36 is projected from the lower rear portion of the front lid 31. Furthermore, engaged portions 37 and 38 are provided to project from the front end upper part and the rear end upper part of the rear lid 32, respectively. Then, the front lid 31 and the rear lid 32 are disposed so that the engaging portion 36 is positioned between the engaged portions 37 and 38.

  When the front lid 31 moves rearward from the closed state, the engaging portion 36 engages with the engaged portion 38 from the middle, and the rear lid 32 moves backward in conjunction. Further, when the front lid 31 moves forward from the open state, the engaging portion 36 engages with the engaged portion 37 from the middle, and the rear lid 32 moves forward in conjunction.

  Here, in contrast to the first and second embodiments described above, the engaging portion 36 plays the role of the left end portion 33a and the right end portion 33b of the interlocking shaft 33, and the engaging groove 34a ( 34aL, 34aR), the engaged portions 37, 38 serve as the front and rear ends. Even in the configuration as shown in FIG. 5B, the front-rear operation of the lid 30 is the same as in the first and second embodiments. The configuration in such an engagement relationship is not limited to the illustrated example, and various configurations are conceivable.

  In the configuration as shown in FIG. 5B, when the vertical relationship of the stack of the front lid 31 and the rear lid 32 is the same as that in the first and second embodiments, FIG. A configuration as shown may be used. In this case, the engaging portion and the engaged portion are not visible if they are provided not at the left and right end positions of the front lid 31 and the rear lid 32 but at an intermediate position in the left-right direction, so that the appearance does not deteriorate.

  In each of the above-described embodiments, the lid 30 has a two-piece configuration of the front lid 31 and the rear lid 32. However, the lid 30 is divided into two pieces that are connected and stacked when the lid is opened. Any structure having a lid may be used. Therefore, another lid may be connected to the front part or the rear part of these two lids to form three or more.

  10 keyboard instrument, 15L left side plate, 15aL outer side (left outer side), 15bL inner side (left inner side), 15R right side plate, 15aR outer side (right outer side), 15bR inner side (right inner side), 17L protruding portion (left protruding portion, rear lid supporting portion), 17R protruding portion (right protruding portion, rear lid supporting portion), 18L, 18R gear member, 18aL rack gear portion (left rack gear portion), 18aR rack gear portion (Right rack gear), 19L guide slot (left guide slot), 19R guide slot (right guide slot), 21 rotation shaft (left rotation shaft, right rotation shaft), 22 cover body (left cover) Body, right cover body), 22a front end, 22b lower edge, 30 lid, 31 front lid, 31a rear end, 32 rear lid, 33 interlocking shaft (engagement portion), 33a left end, 33 Right end, 34a engagement groove (engaged portion), 35L pinion gear (left pinion gear), 35R pinion gear (right pinion gear), 36 engagement portion, 37, 38 engaged portion, sL hollow portion (left hollow portion), sR hollow part (right side hollow part)

Claims (4)

A lid having a front lid and a rear lid that are configured to be divided and are adjacent to each other at the time of closing and overlapping and housed at the rear of the casing of the keyboard instrument at the time of opening,
The left and right side hollow portions are formed on the left and right sides of the casing of the keyboard instrument, between the left inner surface and the left outer surface, and between the right inner surface and the right outer surface, respectively. Left side plate / right side plate,
In the left side hollow part / the right side hollow part of the left side plate part / the right side plate part, a left side rack gear part / a right side rack gear part formed extending in the front-rear direction, respectively,
An interlocking shaft that is pivotally supported at the rear end of the front lid and protrudes left and right;
Left pinion gear / right pinion gear fixed to the left end / right end of the interlocking shaft,
A left guide slot / right guide slot formed in the left plate / right plate along the moving direction of the interlocking shaft corresponding to the entire opening and closing process of the lid,
The left end portion / the right end portion of the interlocking shaft pass through the left guide slot / the right guide slot, respectively, and the left pinion gear / the right pinion gear are positioned in the left hollow portion / the right hollow portion. Then, by pushing and pulling the front lid, the left pinion gear / the right pinion gear meshes with the left rack gear portion / the right rack gear portion and rolls so that the front lid slides back and forth. Configured ,
The left side guide groove / the right side guide groove in the open state in the left inner side surface / the right inner side surface of the left side plate part / the right side plate part above the left side guide slot / right side guide slot, respectively. Left projection / right projection is provided to blind the hole,
The lid opening / closing structure of a keyboard instrument, wherein the left protruding portion / right protruding portion supports a rear end portion of the rear lid so as to be slidable when the lid is opened and closed. A lid having a front lid and a rear lid that are configured to be divided and are adjacent to each other at the time of closing and overlapping and housed at the rear of the casing of the keyboard instrument at the time of opening,
The left and right side hollow portions are formed on the left and right sides of the casing of the keyboard instrument, between the left inner surface and the left outer surface, and between the right inner surface and the right outer surface, respectively. Left side plate / right side plate,
In the left side hollow part / the right side hollow part of the left side plate part / the right side plate part, a left side rack gear part / a right side rack gear part formed extending in the front-rear direction, respectively,
An interlocking shaft that is pivotally supported at the rear end of the front lid and protrudes left and right;
Left pinion gear / right pinion gear fixed to the left end / right end of the interlocking shaft,
A left guide slot / right guide slot formed in the left plate / right plate along the moving direction of the interlocking shaft corresponding to the entire opening and closing process of the lid,
The left end portion / the right end portion of the interlocking shaft pass through the left guide slot / the right guide slot, respectively, and the left pinion gear / the right pinion gear are positioned in the left hollow portion / the right hollow portion. Then, by pushing and pulling the front lid, the left pinion gear / the right pinion gear meshes with the left rack gear portion / the right rack gear portion and rolls so that the front lid slides back and forth. Configured,
Furthermore, the left side plate / right side plate has a left cover body / a right cover body provided to be rotatable about a left rotation axis / right rotation axis along the left-right direction, respectively, When the left cover body / the right cover body is closed, the front portion of the left rotation shaft / the right rotation shaft is in contact with and supported by the interlocking shaft, and the rotation position is restricted. Occasionally, the front portion is rotated downward as compared to when the lid is closed, and at least the front half of the left guide slot / right guide slot is closed by the left cover / right cover. cover opening and closing structure of the key board instrument you characterized in that it is configured. The portion of the left cover body / the right cover body that contacts the interlocking shaft in the front portion is inclined downward as it goes forward in the entire stroke in which the front portion contacts the interlocking shaft, and 3. The lid opening / closing structure for a keyboard instrument according to claim 2 , wherein the left rack gear portion / the front half portion of the right rack gear portion is inclined downward as it goes forward. The housing is provided with a rear lid support portion that supports the rear lid so as to be movable in the front-rear direction, the front lid is provided with an engaging portion, and the rear lid is provided with an engaged portion. When the front lid is moved in the front-rear direction by the operation of the front lid, the engaging portion of the front lid and the engaged portion of the rear lid are engaged with each other, thereby interlocking with the front lid. The keyboard instrument lid opening / closing structure according to any one of claims 1 to 3 , wherein the rear lid is configured to move.

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