JP7346821B2 - Keyboard instrument lid structure, keyboard instrument - Google Patents

Description

The present invention relates to a keyboard instrument lid structure and a keyboard instrument in which a front lid and a rear lid are relatively rotatably connected by a hinge.

Conventionally, there has been known a lid structure for a keyboard instrument in which a front lid and a rear lid are relatively rotatably connected by a hinge. Patent Document 1 below discloses an electronic keyboard in which a front lid (front cover) is rotatably supported by the instrument body, and a rear lid (rear cover) is movably supported by a guide mechanism provided on a side plate. Instruments are listed. A first stopper and a second stopper are provided on the side plate. In the lid opening stroke, when the front lid is rotated in the opening direction, the rear lid is also rotated in conjunction with the rotation. Eventually, the front lid comes into contact with the first stopper, and the rear lid comes into contact with the second stopper, thereby regulating the end positions of the opening strokes of the front lid and the rear lid, resulting in a fully open state.

Japanese Patent Application Publication No. 2004-302419

However, in Patent Document 1, it is necessary to provide two stoppers in order to regulate the end positions of the opening strokes of the front cover and the rear cover, so the number of parts is large. If a configuration were adopted in which only a stopper was provided for the rear lid, the rotational displacement of the front and rear lids would be restricted, but rattling would occur especially when the lids were opened, making the operation unstable. There is a risk that this may occur.

An object of the present invention is to provide a keyboard instrument lid structure and a keyboard instrument that can avoid an increase in the number of parts, ensure smooth opening operation, and stabilize the operation when the lid is opened. It is.

In order to achieve the above object, the present invention has a front lid that is rotatable around a rotational fulcrum fixed to the main body of the musical instrument, an engaging portion, and a hinge that allows the front lid to be moved relative to the front lid by a hinge. a rear lid rotatably connected to the instrument body; and a rear lid provided on the musical instrument body that engages with the engaging portion of the rear lid and guides the engaging portion during opening and closing strokes of the front lid and the rear lid. and a stopper portion fixed to the musical instrument body, the stopper portion being in contact with the rear lid during the opening stroke of the front lid and the rear lid, so that each of the front lid and the rear lid can be opened. a stopper part that regulates an opening stroke end position and makes the front lid and the rear lid fully open by regulating the opening stroke end position, and one of the engaging part and the engaged part. is a pin, and the other is a guide groove portion, and during the opening stroke of the front lid and the rear lid, the engagement portion and the engaged portion cause the rear lid to move around the pin. It moves with a rotational displacement and engages with the pin in the fully open state of the front cover and the rear cover, out of the entire area of the guide groove that engages with the pin during the opening stroke of the front cover and the rear cover. The groove width of a region near the mating position is narrower than the groove width of other regions, and the region of the guide groove near the position where the front cover and the rear cover engage with the pin in the fully open state. A lid structure for a keyboard instrument is provided , wherein the groove width is slightly larger than the diameter of the pin .

According to the present invention, it is possible to ensure a smooth opening operation while avoiding an increase in the number of parts, and to stabilize the operation at the end of opening the lid.

It is a longitudinal side view of the keyboard instrument with a lid in a fully closed state. It is a partial side view of the side plate which shows the structure of a guide groove part. FIG. 3 is a longitudinal side view of the keyboard instrument during the opening/closing process of the lid body. FIG. 3 is a longitudinal side view of the keyboard instrument during the opening/closing process of the lid body. FIG. 3 is a longitudinal side view of the keyboard instrument with the lid fully open. It is a figure which shows the guide groove part of a modification. It is a schematic diagram of the lid structure of a modification.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional side view of a keyboard instrument to which a lid structure according to an embodiment of the present invention is applied. This keyboard instrument is configured as, for example, an electronic piano. In FIG. 1, a casing 10 (musical instrument main body) of a keyboard instrument is shown, and illustration of the legs is omitted. Furthermore, illustrations of electrical and electronic components for generating sound and the like are also omitted. Note that the keyboard instrument to which the lid structure of the present invention is applied may be an acoustic piano, and it is not essential to have legs. The left and right directions of the housing 10 are referred to as the direction seen from the player. Furthermore, in the front-rear direction, the side far from the player (the left side in FIG. 1) is defined as the rear. In FIG. 1, the right side of the housing 10 is visible from the inside.

The housing 10 is composed of a shelf board 11, a top board 13, a back board 12, a mouth bar 14, a front stile 18, two side boards 15, and the like. In FIG. 1, only the right side plate 15 among the left and right side plates 15 is shown. Inside the housing 10, a key frame 19 is arranged on the shelf board 11. A keyboard section KB each consisting of a plurality of white keys WK and a plurality of black keys BK is arranged on the key frame 19.

The lid structure of the present invention mainly includes a lid body 30, a pivot point 16, a guide groove portion 20, and a stopper portion 17. The guide groove portion 20 is formed on the inside (left side) of the right side plate 15. Both the stopper portion 17 and the pivot point 16 are fixed to the inside of the right side plate 15. The main lid structure is symmetrical. The lid body 30 is arranged between the left and right side plates 15 in the left-right direction. Similar pivot points 16, guide grooves 20, and stopper portions 17 are arranged on the left side. Hereinafter, when explaining laterally symmetrical components in detail, the ones on the right side will be explained as a representative.

The lid body 30 includes a front lid 31, a rear lid 32, and a hinge 33. The rear lid 32 is rotatably connected to the front lid 31 by a hinge 33. The front lid 31 is rotatable about the rotation fulcrum 16. Normally, a user grasps the front lid 31 to open and close the lid 30. The front lid 31 and the rear lid 32 are moved in conjunction with each other by opening and closing operations. In FIG. 1, the lid body 30 is shown in a fully closed state. In the fully closed state, the front lid 31 and the rear lid 32 are lined up one after the other. A support plate 34 is provided at the lower rear portion of the rear lid 32 and extends downward. The support plate 34 is provided with a pin 35 whose axial direction is in the left-right direction. The pin 35 on the right side protrudes to the right, and the pin (not shown) on the left side protrudes to the left. The pin 35 is an engaging portion that engages with the guide groove portion 20, which is an engaged portion. During the opening/closing process of the lid 30, the pin 35 is guided by the guide groove 20. That is, the guide groove portion 20 functions to guide the movement of the pin 35 during the entire opening and closing stroke of the lid body 30.

FIG. 2 is a partial side view of the side plate 15 showing the configuration of the guide groove portion 20. As shown in FIG. 3 and 4 are vertical side views of the keyboard instrument during the opening/closing process of the lid body 30. FIG. 5 is a longitudinal sectional side view of the keyboard instrument with the lid 30 fully open. FIG. 5 shows the lid 30 in a fully open state. 3 and 4 show the state in the middle of the opening/closing process. The stroke from the fully closed state (FIG. 1) to the fully open state (FIG. 5) is the opening stroke, and the stroke from the fully open state to the fully closed state is the closing stroke. Pins 35a, 35b, 35c, and 35d shown in FIG. 2 indicate the positions of the pin 35 in a fully closed state (FIG. 1), an intermediate state (FIG. 2), an intermediate state (FIG. 3), and a fully open state (FIG. 5), respectively. ing.

As shown in FIG. 2, the guide groove portion 20 is formed substantially in the front-rear direction. The guide groove portion 20 has ceiling surfaces 22 , 23 , 24 and a bottom surface 21 . Note that a sheet material 25 is attached to the lower surface of the guide groove 20 to improve slipperiness. The upper exposed surface of this sheet material 25 becomes the bottom surface 21 of the guide groove portion 20. The entire region in the longitudinal direction of the guide groove portion 20 is roughly divided into a first region 20a, a second region 20b, and a third region 20c in order from the front side. In the first region 20a, the first groove width, which is the distance between the ceiling surface 22 and the bottom surface 21, is B1. In the second region 20b, the second groove width, which is the distance between the ceiling surface 24 and the bottom surface 21, is B2. In the first region 20a, the ceiling surface 23 connected to the ceiling surface 24 is a slope. Therefore, the distance between the ceiling surface 24, the ceiling surface 23, and the bottom surface 21 becomes narrower as it approaches the second region 20b, and the second groove width approaches B2. Note that the third region 20c is a space provided to facilitate the work of attaching the sheet material 25 to the guide groove portion 20, and is not essential for the guide function of the lid body 30.

The second region 20b of the guide groove 20 is a region near the position where the lid 30 engages with the pin 35 when it is fully opened. The second groove width B2 in the second region 20b is narrower than the first groove width B1. The first groove width B1 is larger than the diameter of the pin 35. The second groove width B2 is equal to or slightly larger than the diameter of the pin 35. Note that the region near the position where the lid body 30 engages with the pin 35 in the fully open state may include the region where the ceiling surface 23 and the bottom surface 21 face each other.

Next, the opening/closing operation of the lid body 30 will be explained. When the user moves the front end of the front cover 31 upward in the fully closed state, the front cover 31 rotates counterclockwise in FIG. 1 about the rotation fulcrum 16. At this time, the rear cover 32 is displaced in conjunction with the movement of the hinge 33, and the pin 35 slides in the guide groove 20. Therefore, the rear cover 32 moves substantially rearward with rotational displacement. When the rear lid 32 moves, the pins 35 come into contact with the bottom surface 21 of the guide groove 20 due to the weight of the rear lid 32 (pins 35b, 35c). When the user further rotates the front cover 31 counterclockwise from the intermediate state (FIG. 4), the pin 35 passes through the rear part of the first area 20a and enters the second area 20b, and the rear cover 32 moves from the pin to the second area 20b. Rotate slightly clockwise around 35.

Thereafter, the rear lid 32 comes into contact with the stopper portion 17, thereby regulating the opening stroke end position of the rear lid 32. When the rear lid 32 cannot be displaced, the front lid 31 connected to the rear lid 32 by a hinge 33 also cannot be displaced. Therefore, when the opening stroke end position of the rear lid 32 is regulated, the opening stroke end position of the front lid 31 is also regulated in conjunction with this. By restricting the opening stroke end positions of the front lid 31 and the rear lid 32, the lid body 30 is fully opened (FIG. 5).

In the fully open state, the pin 35 is located between the ceiling surface 24 and the bottom surface 21 (pin 35d). Since the second groove width B2 is the same as or slightly larger than the diameter of the pin 35, the pin 35 is engaged so as to fit between the ceiling surface 24 and the bottom surface 21 at the end of the opening stroke. Here, since the ceiling surface 23, which is a slope, is formed at the rear of the first region 20a, the pin 35 smoothly enters between the ceiling surface 24 and the bottom surface 21.

In the fully open state, the stopper portion 17 is located between the hinge 33 and the pin 35 in the straight line direction connecting the hinge 33 and the rear free end of the rear lid 32. Therefore, when the rear cover 32 comes into contact with the stopper part 17, a "lever"-like action occurs, with the hinge 33 as the point of effort, the stopper part 17 as the fulcrum, and the pin 35 as the point of action. Normally, at the moment when the rear lid 32 comes into contact with the stopper portion 17, there remains an inertial force in the front lid 31 that causes it to rotate in the opening direction. Therefore, as the rear cover 32 rotates clockwise in FIG. 1 using the stopper portion 17 as a fulcrum, the pin 35 tends to rise. If the second groove width B2 is the same width as the first groove width B1 and is larger than the diameter of the pin 35 by a margin, then at the end of the opening stroke, the rear cover will rotate about the stopper part 17 mentioned above. As a result, the pin 35 may rise, leaving the bottom surface 21 and coming into contact with the ceiling surface 24. Moreover, immediately after that, the pin 35 descends and comes into contact with the bottom surface 21 again. Alternatively, the pin 35 may repeatedly come into contact with the ceiling surface 24 and the bottom surface 21 multiple times. Such behavior results in so-called "wobble" in the rotational direction of the rear lid 32 and in the rotational direction of the front lid 31 connected to the rear lid 32 by a hinge 33.

However, in the present embodiment, in the second region 20b near the position where it engages with the pin 35 in the fully open state, the second groove width B2 is made narrower than the first groove width B1. This functions to suppress rattling of the rear lid 32 in the rotational direction. On the other hand, since the first groove width B1 is larger than the diameter of the pin 35 with a margin, the guide groove portion 20 can smoothly guide the pin 35 until just before the end of the opening stroke.

Immediately after the rear lid 32 contacts the stopper portion 17, the pin 35 strongly contacts the ceiling surface 24, thereby restricting rotational displacement of the rear lid 32. At the same time, the rotational displacement of the front lid 31 is also restricted. In this manner, strictly speaking, the opening stroke of the rear lid 32 and the front lid 31 is controlled by the rear lid 32 coming into contact with the stopper part 17 and the ceiling surface 24 coming into contact with the pin 35 to restrict the displacement of the pin 35. End position is regulated. In the fully open state, the front lid 31 faces the front stile 18 with a distance maintained (see FIG. 5), so the front lid 31 is not scratched or has contact marks, and the front stile 18 is covered with cushioning material. There is no need to provide a stopper. Further, in the fully closed state, the stopper portion 17 is hidden behind the front lid 31 and the rear lid 32 and cannot be seen, contributing to an improved appearance.

According to this embodiment, one stopper portion 17 comes into contact with the rear lid 32 during the opening stroke, thereby regulating the opening stroke end positions of the front lid 31 and the rear lid 32, respectively. The stopper portion 17 restricts the opening stroke end position, thereby bringing the front lid 31 and the rear lid 32 into a fully open state. Since only one stopper portion 17 is required, an increase in the number of parts can be avoided. Furthermore, of the entire area of the guide groove 20 that engages with the pin 35 during the opening stroke, the second groove width B2 of the second area 20b near the position that engages with the pin 35 when the lid body 30 is fully opened is , is narrower than the first groove width B1 in the other region (20a). Therefore, the operation of the lid body 30 at the end of the opening stroke can be stabilized. In particular, when the stopper part for the front cover 31 and the stopper part for the rear cover 32 are provided separately as in the conventional case, the operation becomes unstable if the timing of contact between each cover and the stopper part is shifted from each other. . In this embodiment, since the stopper portion 17 is single, the problem of deviation in contact timing does not occur. Moreover, since the first groove width B1 is larger than the diameter of the pin 35 with a margin, the guide groove portion 20 appropriately fulfills the function of guiding the pin 35 during the opening stroke. Therefore, it is possible to ensure a smooth opening operation while avoiding an increase in the number of parts, and to stabilize the operation at the end of opening the lid.

In particular, since the second groove width B2 is the same as or slightly larger than the diameter of the pin 35, it is possible to suppress rattling in the rotational direction of the rear cover 32 at the end of the opening stroke. can. Note that the second groove width B2 may be approximately equal to the diameter of the pin 35. In this way, it is possible to more reliably suppress rattling of the rear lid 32 in the rotational direction at the end of the opening stroke.

Further, the guide groove portion 20, which is an engaged portion that performs a guide function, is formed on the side plate 15, and the pin 35, which is an engaged portion to be guided, is provided on the rear lid 32, so that the rear lid 32 can be configured compactly. be able to.

A modified example will be explained with reference to FIGS. 6 and 7. FIG. 6 is a diagram showing a guide groove portion 20 of a first modification. As shown in FIG. 6, a cushioning material 26 may be provided on the ceiling surface at least in the second region 20b. In this case, the second groove width B2 is the distance between the lower exposed surface of the cushion material 26 and the bottom surface 21. The second groove width B2 may be approximately equal to the diameter of the pin 35, but may be slightly smaller than the diameter of the pin 35 in consideration of the compression range of the cushion material 26.

Note that providing the sheet material 25 is not essential. When the sheet material 25 is not provided, the actual bottom surface of the guide groove portion 20 becomes the bottom surface 21. The first groove width B1 and the second groove width B2 are based on the actual bottom surface of the guide groove portion 20.

FIG. 7 is a schematic diagram of a lid structure of a second modification. In order to avoid an increase in the number of parts, ensure smooth opening operation, and stabilize the operation when opening the lid, one of the engaging part and the engaged part is a pin, and the other is a pin. may be a guide groove. Therefore, the second modification shown in FIG. 7 may be adopted. That is, in the embodiment described above, the guide groove portion 20 is formed in the side plate 15, and the pin 35 is provided in the rear lid 32. On the other hand, in the second modification shown in FIG. 7, the components of the side plate 15 and the rear lid 32 are opposite to those of the example shown in FIG. That is, in the second modified example shown in FIG. provided.

In a second modification shown in FIG. 7, a pin 135 is provided to protrude inward from the side plate 15. On the other hand, a plate-shaped portion 36 is provided to hang downward from the rear lid 32. A guide groove portion 120 is formed in the plate-like portion 36. Although the guide groove portion 120 is a penetrating elongated hole, it may be a blind hole. The pin 135 and the guide groove 120 correspond to the pin 35 and the guide groove 20, respectively. A sheet material 125 corresponding to the sheet material 25 is attached to the ceiling surface of the guide groove portion 120 .

The guide groove portion 120 has bottom surfaces 122 , 123 , and 124 and a ceiling surface 121 . The lower exposed surface of the sheet material 125 becomes the ceiling surface 121 of the guide groove section 120. The entire region in the longitudinal direction of the guide groove portion 120 is roughly divided into a first region 120a, a second region 120b, and a third region 120c in order from the rear side. The bottom surfaces 122, 123, 124, the ceiling surface 121, the first region 120a, the second region 120b, and the third region 120c are respectively the ceiling surfaces 22, 23, 24, the bottom surface 21, the first region 20a, and the second region in FIG. 20b corresponds to the third region 20c. In the first region 120a, the width between the bottom surface 122 and the ceiling surface 121 is the first groove width B1. In the second region 120b, the width between the bottom surface 124 and the ceiling surface 121 is the second groove width B2. The relationship between the first groove width B1 and the second groove width B2 is the same as in the example of FIG.

Regarding the operation in the opening/closing stroke, the relationship between the side plate 15 and the rear lid 32 is reversed from that in the example of FIG. 1, but the operation is basically the same. In the opening stroke from the fully closed state, the ceiling surface 121 of the guide groove 120 slides against the pin 35 due to the weight of the rear cover 32 . When the rear lid 32 comes into contact with the stopper portion 17, and the opening stroke end position of the rear lid 32 is regulated, the opening stroke end position of the front lid 31 is also regulated in conjunction with this. At the end of the opening stroke, the pin 135 is fitted between the bottom surface 124 and the ceiling surface 121. Therefore, similarly to the example of FIG. 1, the second region 120b functions to suppress rattling of the rear lid 32 in the rotational direction.

Although the present invention has been described above in detail based on its preferred embodiments, the present invention is not limited to these specific embodiments, and the present invention may take various forms without departing from the gist of the present invention. included.

16 rotation fulcrum, 17 stopper section, 20, 120 guide groove section, 20a, 120a first region, 20b, 120b second region, 30 lid body, 31 front lid, 32 rear lid, 33 hinge, 35, 135 pin

Claims (4)

A front lid that can be rotated around a rotation fulcrum fixed to the instrument body;
a rear lid having an engaging portion and rotatably connected to the front lid by a hinge;
an engaged part that is provided on the musical instrument body and that engages with the engaging part of the rear lid and guides the engaging part during opening and closing strokes of the front lid and the rear lid;
A stopper portion fixed to the musical instrument body, which controls the end positions of the opening strokes of the front lid and the rear lid by coming into contact with the rear lid during the opening strokes of the front lid and the rear lid, and , a stopper portion that makes the front lid and the rear lid fully open by regulating the end position of the opening stroke;
One of the engaging part and the engaged part is a pin, and the other is a guide groove part,
In the opening stroke of the front lid and the rear lid, the rear lid moves with rotational displacement about the pin due to the engagement between the engaging part and the engaged part,
A groove in a region of the guide groove portion that is in the vicinity of a position where the front lid and the rear lid engage with the pin when the front lid and the rear lid are in the fully open state, out of the entire region that engages with the pin during the opening stroke of the front lid and the rear lid. The width is narrower than the groove width in other areas.
A lid structure for a keyboard instrument, wherein a groove width of a region of the guide groove near a position where the front lid and the rear lid engage with the pin in the fully open state is slightly larger than a diameter of the pin. 2. The lid structure for a keyboard instrument according to claim 1 , wherein the engaged portion is the guide groove portion, and the engaging portion is the pin. 3. The lid structure for a keyboard instrument according to claim 1 , wherein when the front lid and the rear lid are in a fully closed state, the stopper part is hidden by the front lid and the rear lid and cannot be seen. A keyboard instrument, comprising the keyboard instrument lid structure according to any one of claims 1 to 3 .

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