JP3681668B2 - Keyboard lid opening / closing control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a keyboard lid opening / closing control device for controlling the opening / closing of a rotating keyboard lid of an upright piano or an upright electronic piano.
[0002]
[Prior art]
This type of keyboard lid has a rear end portion rotatably connected to the back roof via a hinge, and is opened and closed around this hinge. When closing the keyboard lid, it is pulled and rotated toward the near side so that the lower surface of the front end of the keyboard lid is brought into contact with the upper surface of the mouth bar. In such an open / close method, when the closing operation is not appropriate, the keyboard lid will rotate vigorously with its own weight, and it will collide strongly with the lip and damage the keyboard lid or lip. There is a risk of having a finger in between.
[0003]
The keyboard lid opening / closing control device is for solving such problems, and as one of them, a shock absorber composed of a one-way torque type hydraulic damper fixed to a brace or a shelf, a shock absorber and a keyboard A device having a link mechanism connected between lids is conventionally known. According to this configuration, when the keyboard lid rotates in the closing direction, the braking force of the shock absorber acts on the keyboard lid via the link mechanism, so that the keyboard lid is slowly closed.
[0004]
[Problems to be solved by the invention]
However, the above-described conventional opening / closing control device has a problem that it is difficult to comply with the JIS regulations that determine the attachment / detachment of the keyboard lid. That is, JIS stipulates that the keyboard cover of an upright piano must be detachable without using a tool or the like. On the other hand, in the conventional opening / closing control device, the shock absorber is fixed to the arm or the shelf board integral with the piano body, and further connected to the keyboard lid via the link mechanism. In this case, the components must be separated at at least one of the connecting portions between the components from the keyboard lid to the shock absorber. For this reason, in order to satisfy the JIS regulations, the connecting portion to be separated must be structured so that it can be easily attached and detached without using a tool or the like. In that case, the portion is easily detached when the keyboard lid is opened and closed. It is difficult to stably open and close the lid.
[0005]
The present invention has been made to solve such problems. The keyboard lid can be stably opened and closed and can be closed slowly, and the keyboard lid can be easily attached and detached without using a tool or the like. It is an object of the present invention to provide a keyboard lid opening / closing control device that can be performed in a simple manner.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the present invention is a keyboard lid opening / closing control device for controlling the opening / closing of a keyboard lid pivotally attached to a back roof, the back roof being detachably attached to a piano body. In addition, one end is accommodated in a recess formed on the side surface of the keyboard lid so as to be flush with the side surface and connected to the keyboard lid, and attached to the back roof, A shock absorber that is connected to the other end portion and brakes the keyboard cover via the link mechanism when the keyboard cover rotates in the closing direction. The shock absorber is connected to the other end portion of the link mechanism. It is characterized by comprising a one-way torque type hydraulic damper having a rotatable shaft portion.
[0007]
In this keyboard lid opening / closing control device, when the keyboard lid is closed, the shock absorber brakes the keyboard lid via the link mechanism while the keyboard lid is rotated in the closing direction, so that the keyboard lid is decelerated, and the keyboard lid is Surely closes slowly. Since this shock absorber is composed of a one-way torque type hydraulic damper, unlike a shock absorber using a coil spring, there is almost no fatigue even when used for a long time, and the keyboard lid is stably braked for a long time. be able to. In addition, space can be saved in the vicinity of the shock absorber as compared to a case where the shock absorber is configured with a hydraulic damper in which the piston linearly advances and retreats. In addition, since the shock absorber is attached to the back roof that is detachable with respect to the piano body, the keyboard cover can be attached and detached together with the back roof, the shock absorber, and the link mechanism. Therefore, the keyboard lid can be easily attached and detached without using a tool, the JIS regulations can be easily cleared, and the keyboard lid can be opened and closed stably without any separation. Furthermore, one end of the link mechanism is accommodated in a concave portion on the side surface of the keyboard lid, and is flush with the side surface so that it cannot be seen from the front with the keyboard lid open, further improving the appearance of the piano.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a keyboard lid of an upright piano to which the present invention is applied and an opening / closing control device thereof. The keyboard lid 1 is made of plywood or the like, and has a horizontally-long rectangular planar shape and an inverted L-shaped cross-sectional shape. The keyboard lid 1 has a rear end portion rotatably attached to a front end portion of the back roof 3 via a hinge 2, and the open position shown in FIG. 1 and the closed position shown in FIG. It is opened and closed by rotating between.
[0009]
The back roof 3 is made of plywood or the like, and is configured to be detachable with respect to a piano body (not shown) in the same manner as the upper front plate 4 erected thereon. Specifically, the back roof tree 5 is attached to the rear end of the bottom surface of the back roof 3, and the back roof tree 5 is upward between the three back roof supports 6 projecting inward from the arms (not shown). The back roof 3 is detachably attached to the arm by being fitted from above. In the figure, reference numeral 7 is a shelf board, 8 is a beat tree, 9 is a mouth stick attached to the front surface of the shelf board 7, and the keyboard lid 1 contacts the mouth stick 9 in the closed position.
[0010]
The opening / closing control device 10 according to the present invention includes a shock absorber 11 for braking the rotation of the keyboard lid 1 toward the closed position, and a link mechanism 12 for transmitting the braking force of the shock absorber 11 to the keyboard lid 1. It is constituted by.
[0011]
The shock absorber 11 is configured by a one-way torque hydraulic damper having a cylindrical casing 13 filled with oil and a shaft portion 14 that is rotatably fitted to the casing 13. Screwed to one side of the lower surface of the back roof 3 via an attachment member 15. The shock absorber 11 is configured so as to apply braking only when the shaft portion 14 rotates counterclockwise in FIG. 1, and does not perform braking against rotation in the opposite direction, that is, no load is applied. Has been. The braking force of the shock absorber 11 is designed to gradually increase as the rotation angle of the shaft portion 14 in the clockwise direction increases. Further, an arm 16 is integrally provided on the shaft portion 14 so as to extend in the radial direction from the center thereof.
[0012]
The link mechanism 12 includes two link bars 12a and 12b that are rotatably connected to each other. One link bar 12a is screwed to the lower end of the back surface of the keyboard cover 1 and the other link bar. 12b is connected with the arm 16 of the axial part 14 so that rotation is possible. In addition, a notch 17 is formed on the lower surface of the back roof 3 so that these link bars 12a and 12b do not interfere with the back roof 3.
[0013]
Next, the operation of the opening / closing control apparatus 10 having the above configuration will be described. The solid line in FIG. 3 shows a state in which the keyboard lid 1 is in the closed position, as in FIG. In this closed position, the keyboard lid 1 is rotated to the maximum in the clockwise direction, and its front part abuts on the mouth bar 9 and covers the keyboard (not shown) and the timepiece 8. Further, the shaft portion 14 of the shock absorber 11 connected to the keyboard lid 1 via the link mechanism 12 rotates to the maximum in the counterclockwise direction.
[0014]
When the keyboard lid 1 is raised from this closed position, the keyboard lid 1 rotates counterclockwise, that is, backward, and the shaft portion 14 of the shock absorber 11 is pulled clockwise by being pulled by the link mechanism 12. Rotate. This rotation is terminated when the front corner of the keyboard lid 1 abuts on the upper front plate 4, and the keyboard lid 1, the link mechanism 12 and the shaft portion 14 of the shock absorber 11 are shown in FIGS. The open position indicated by the two-dot chain line is reached. As described above, since the braking force of the shock absorber 11 does not act during rotation in the open position direction, the keyboard lid 1 can be easily opened.
[0015]
When the keyboard lid 1 is tilted forward from this open position, the keyboard lid 1 rotates clockwise. At this time, the braking force of the shock absorber 11 acts on the keyboard lid 1 via the link mechanism 12, and the rotation of the keyboard lid 1 is decelerated and buffered by this braking force. Further, since the braking force of the shock absorber 5 gradually increases as the keyboard cover 1 approaches the closed position, the braking force is maximized at the closing end of the keyboard cover 1 where the rotation speed is likely to increase, and the keyboard cover 1 is reliably secured. It can be closed slowly.
[0016]
Moreover, in the opening / closing control apparatus 10 of this embodiment, since the shock absorber 11 is attached to the back roof 3 comprised so that attachment or detachment with respect to the piano main body was carried out, attachment / detachment of the keyboard cover 1 is carried out. 11 and the link mechanism 12 can be performed together. Therefore, the keyboard cover 1 can be easily attached and detached without using a tool or the like, the JIS regulations can be easily cleared, and the keyboard cover 1 can be opened and closed stably without any separation. Furthermore, with the keyboard lid 1 open, most of the shock absorber 11 and the link mechanism 12 are hidden under the back roof 3, and a part of the link mechanism 12 is only slightly visible below the keyboard lid 1. The appearance of the piano is also preferable.
[0017]
Next, a keyboard lid opening / closing control device according to a second embodiment of the present invention will be described with reference to FIGS. The opening / closing control device 20 is mainly different from the opening / closing control device 10 of the first embodiment in the attachment structure of the link mechanism to the keyboard lid 1. That is, in the opening / closing control device 10, the link bar 12 a on the keyboard lid 1 side of the link mechanism 12 is screwed to the lower end of the back surface of the keyboard lid 1, whereas in the opening / closing control device 20, the outer surface of the keyboard lid 1. A recess 21 is formed in the recess 21, and a link bar 22 a on the keyboard lid 1 side of the link mechanism 22 is attached to the recess 21. The recess 21 extends along the keyboard lid 1, opens on the back surface thereof, and has a width and a depth that match the link bar 22 a, so that the link bar 22 a is located outside the keyboard lid 1 in the recess 21. It is housed in the same state as the side. In this state, the link bar 22a is fixed to the outer surface of the keyboard lid 1 with screws 23.
[0018]
Further, the link bar 22a is configured to be longer than the link bar 12a of the first embodiment. This is because when the link bar 22a is attached to the side surface of the keyboard lid 1, a shearing force is applied from the shock absorber 11 side, so that the link bar 22a is firmly fixed so as to sufficiently resist the shearing force. It is to do. In the present embodiment, the shaft portion 14 and the arm 16 of the shock absorber 11 are integrally formed in advance. Other configurations are the same as those of the first embodiment.
[0019]
According to the above configuration, the operation of the opening / closing control device 20 is exactly the same as that of the opening / closing control device 10 of the first embodiment described above, and therefore, the keyboard lid 1 is stabilized as in the case of the first embodiment. The keyboard lid 1 can be attached and detached easily without using a tool. Further, the link bar 22a of the link mechanism 22 is accommodated in the concave portion 21 on the outer side surface of the keyboard lid 1 and is flush with the outer side surface so that it cannot be seen from the front with the keyboard lid 1 opened. The appearance can be further improved.
[0020]
In the two embodiments described above, a one-way torque type hydraulic damper is used as the shock absorber 11, but other suitable shock absorbers may be used. The embodiment is an example applied to the keyboard cover of an upright piano, but the present invention may of course be applied to the keyboard cover of an upright electronic piano.
[0021]
【The invention's effect】
As described above, the keyboard lid opening / closing control device of the present invention can stably open and close the keyboard lid and can close it slowly, and can easily attach and detach the keyboard lid without using a tool or the like. Has the effect of being able to.
[Brief description of the drawings]
FIG. 1 is a side view showing a keyboard lid opening / closing control device for an upright piano according to a first embodiment of the present invention, with the keyboard lid opened, together with its peripheral configuration.
FIG. 2 is a side view similar to FIG. 1, with the keyboard lid closed.
FIG. 3 is a partially enlarged side view showing the operation of the opening / closing control device.
FIG. 4 is a side view showing a keyboard lid opening / closing control device according to a second embodiment of the present invention, along with its peripheral configuration.
FIG. 5 is a front view corresponding to FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Keyboard cover 3 Back roof 10 Opening / closing control apparatus 11 Shock absorber 12 Link mechanism 14 Shaft part 20 Opening / closing control apparatus 21 Recessed part 22 Link mechanism 22a Link bar

Claims (1)

A keyboard lid opening / closing control device for controlling opening / closing of a keyboard lid pivotally attached to the back roof,
The back roof is detachably attached to the piano body,
A link mechanism that is housed in a recess formed on a side surface of the keyboard lid so that the one end portion is flush with the side surface and coupled to the keyboard lid;
A shock absorber attached to the back roof, connected to the other end of the link mechanism, and brakes the keyboard cover via the link mechanism when the keyboard cover rotates in the closing direction. And
2. The keyboard lid opening / closing control device according to claim 1, wherein the shock absorber comprises a one-way torque hydraulic damper having a pivotable shaft connected to the other end of the link mechanism.

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