JP2002132251A - Opening/closing controller for fallboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening/closing controller for a fallboard which enables a player to stably open and close the fallboard, to slowly close the fallboard and easily attach and detach the fallboard without using tools or the like. SOLUTION: The opening/closing controller 10 for the fallboard 1 for controlling the opening and closing of the fallboard 1 freely turnably mounted at a fallboard back section 3 is freely attachably and detachably mounted with the fallboard back section 3 at a main body of a piano and has a link mechanism 22 which is housed in a recessed part 21 formed at its one end at the flank of the fallboard 1 so as to be made flush with this flank and is connected to the fallboard 1 and a bumper 11 which is mounted at the fallboard back section 3, is connected to the other end of the link mechanism 22 and brakes the fallboard 1 across the link mechanism 22 when the fallboard 1 turns in a close direction. The bumper 11 consists of a hydraulic damper of a one-way torque type having a freely turnable shaft part 14 connected to the other end of the link mechanism 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard cover opening / closing control device for controlling the opening / closing of a pivotable keyboard cover of an upright piano or an upright electronic piano.

[0002]

2. Description of the Related Art A keyboard cover of this type has a rear end pivotally connected to a back roof via a hinge, and is opened and closed around the hinge. When closing the keyboard cover, the keyboard cover is pulled to the front side and rotated to bring the lower surface of the front end portion of the keyboard cover into contact with the upper surface of the mouth stick. In such an opening and closing method, when the closing operation is not appropriate, for example, the keyboard lid rotates vigorously under its own weight, and collides strongly with the mouthpiece, thereby damaging the keyboard lid and the mouthpiece, and the keyboard lid and the mouthpiece. There is a risk that a finger may be pinched in between.

A keyboard cover opening / closing control device is provided to solve such a problem. One of the devices is a shock absorber including a one-way torque type hydraulic damper fixed to a brace or a shelf board, and a shock absorber. A device including a link mechanism connected between a keyboard and a keyboard cover is conventionally known.
According to this configuration, when the keyboard cover rotates in the closing direction, the braking force of the shock absorber acts on the keyboard cover via the link mechanism, whereby the keyboard cover is slowly closed.

[0004]

However, the above-mentioned conventional opening / closing control device has a JIS that defines the attachment / detachment of the keyboard cover.
There is a problem that it is difficult to comply with regulations. That is, JI
S stipulates that the keyboard lid of an upright piano must be removable without using tools 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,
Further, since the lid is connected to the keyboard via the link mechanism, the components must be separated at at least one connection point between the components from the lid to the shock absorber when the lid is removed. For this reason, in order to meet the JIS regulations, it is necessary to adopt a structure in which the connecting portion to be separated can be easily attached and detached without using a tool or the like. It is difficult to stably open and close the lid.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to stably open and close a keyboard cover and close it slowly. It is an object of the present invention to provide a keyboard cover opening / closing control device which can be easily operated without any problem.

[0006]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention relates to a keyboard cover opening / closing control device for controlling the opening / closing of a keyboard cover rotatably mounted on a back roof. The roof is detachably attached to the piano body, and one end is accommodated in a recess formed on the side surface of the keyboard cover so as to be flush with the side surface, and a link mechanism connected to the keyboard cover is provided. Attached to the roof, the other end of the link mechanism is connected, and a shock absorber that brakes the keyboard cover via the link mechanism when the keyboard cover turns in the closing direction, And a one-way torque type hydraulic damper having a rotatable shaft connected to the other end of the link mechanism.

In this lid opening / closing control device, when closing the lid, the damper brakes the lid via the link mechanism during rotation of the lid in the closing direction, so that the lid is decelerated. Make sure the lid closes slowly. Since this shock absorber is constituted by 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 cover is braked stably for a long time. be able to. In addition, space saving near the shock absorber can be achieved as compared with a case where the shock absorber is configured by a hydraulic damper in which the piston moves linearly forward and backward. In addition, since the shock absorber is attached to the back roof which is detachable from the piano body, the keyboard lid can be attached and detached together with the back roof, the shock absorber and the link mechanism. Therefore, the cover can be easily attached and detached without using a tool or the like, and the JIS can be easily cleared, and the cover can be opened and closed stably without detachment. Further, one end of the link mechanism is housed in a concave portion on the side surface of the keyboard cover, and is flush with the side surface, and cannot be seen from the front with the keyboard cover opened, so that the external appearance of the piano is further improved.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a keyboard lid of an upright piano to which the present invention is applied and a device for controlling the opening and closing thereof. The keyboard cover 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 rear end of the keyboard cover 1 is rotatably attached to the front end of the back roof 3 via the 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.

The back roof 3 is made of plywood or the like, and like the upper front plate 4 erected thereon, is detachably attached to a piano body (not shown). Specifically, a back-roofed tree 5 is attached to the rear end of the lower surface of the back-roof 3, and the back-roofed wood 5 is located between three back-roof receivers 6 projecting inward from arms (not shown). , The back roof 3 is detachably attached to the arm bar. In the figure, reference numeral 7 denotes a shelf board, 8 denotes a beater board, 9 denotes a mouth stick attached to the front surface of the shelf board 7, and the keyboard cover 1 contacts the mouth stick 9 in the closed position.

The opening / closing control device 10 according to the present invention includes a shock absorber 11 for braking the rotation of the keyboard cover 1 toward the closed position,
A link mechanism 12 for transmitting the braking force of the shock absorber 11 to the keyboard cover 1.

The shock absorber 11 is constituted by a one-way torque type hydraulic damper having a cylindrical casing 13 filled with oil and a shaft part 14 rotatably fitted to the casing 13. The portion is screwed to one side of the lower surface of the back roof 3 via a mounting 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 not to perform braking when rotating in the reverse direction, that is, so that there is no load. Have been. The braking force of the shock absorber 11 is designed to gradually increase as the clockwise rotation angle of the shaft portion 14 increases. Also, the shaft 14
The arm 16 extends radially from its center.
Are provided integrally.

The link mechanism 12 is composed of two link bars 12a and 12b rotatably connected to each other. One link bar 12a is screwed to the lower end of the rear surface of the keyboard cover 1, and the other is connected to the other. Of the shaft portion 14
The arm 16 is rotatably connected to the arm 16. A notch 17 is formed on the lower surface of the back roof 3 to allow the link bars 12a and 12b to escape so as not to interfere with the back roof 3.

Next, the operation of the opening / closing control device 10 having the above configuration will be described. The solid line in FIG. 3 shows a state in which the keyboard cover 1 is in the closed position, as in FIG. In this closed position, the keyboard cover 1 is rotated to the maximum in the clockwise direction, and its front part is in contact with the mouthpiece 9 and covers the keyboard (not shown) and the clap 8. Further, the shaft portion 14 of the shock absorber 11 connected to the keyboard cover 1 via the link mechanism 12 is rotated to the maximum in the counterclockwise direction.

When the keyboard cover 1 is raised from this closed position, the keyboard cover 1 rotates counterclockwise, that is, backward, and the shaft portion 14 of the shock absorber 11 is connected to the link mechanism 1.
2 to rotate clockwise. This rotation is completed when the front corner of the keyboard cover 1 comes into contact with the upper front plate 4. The open position indicated by the two-dot chain line is reached. As described above, during the rotation in the opening position direction, the braking force of the shock absorber 11 does not act, so that
The keyboard cover 1 can be easily opened.

When the keyboard cover 1 is tilted forward from this open position, the keyboard cover 1 rotates clockwise. At this time, the shock absorber 1 is attached to the keyboard lid 1 via the link mechanism 12.
1 is applied, and the rotation of the keyboard cover 1 is reduced and damped by the braking force. Further, the braking force of the shock absorber 5 gradually increases as the keyboard cover 1 approaches the closed position, so that the braking force is maximized at the end of closing the keyboard cover 1 in which the rotation speed tends to increase, and the keyboard cover 1 is securely held. Can be closed slowly.

Further, in the opening / closing control device 10 of the present embodiment, the back roof 3 detachably mounted on the piano body.
Since the shock absorber 11 is mounted on the back cover 1, the keyboard cover 1 can be attached and detached together with the back roof 3, the shock absorber 11 and the link mechanism 12. Therefore, the keyboard cover 1
Can be easily attached and detached without using a tool or the like, and the JIS can be easily cleared, and the keyboard cover 1 can be opened and closed stably without detachment or the like. Furthermore, when the cover 1 is opened, 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 at the lower portion of the cover 1, It is also preferable in the appearance of the piano.

Next, a keyboard cover 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 differs from the opening / closing control device 10 of the first embodiment mainly in the structure of attaching the link mechanism to the keyboard cover 1. That is,
In the opening / closing control device 10, the link bar 12 a of the link mechanism 12 on the keyboard lid 1 side is screwed to the lower end of the rear surface of the keyboard lid 1. A link bar 22a on the keyboard cover 1 side of the link mechanism 22 is attached to the recess 21. The recess 21 extends along the cover 1 and opens to the back thereof, and has a width and a depth matching the link bar 22 a, so that the link bar 22 a is formed outside the cover 1 in the recess 21. It is housed flush with the sides.
In this state, the link bar 22a is fixed to the outer surface of the keyboard cover 1 with the screw 23.

The link bar 22a is 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 cover 1, a shear force is applied from the shock absorber 11 side, so that the link bar 22a is firmly fixed so as to sufficiently resist this shear force. To do that. In the present embodiment, the shaft 14 and the arm 16 of the shock absorber 11 are formed integrally in advance. Other configurations are the same as in the first embodiment.

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 above-described first embodiment, and therefore, as in the case of the first embodiment, the keyboard cover 1 Can be opened and closed stably, and can be closed slowly, and the keyboard cover 1 can be easily attached and detached without using a tool or the like. Further, the link bar 22a of the link mechanism 22 is accommodated in the concave portion 21 on the outer surface of the keyboard cover 1, becomes flush with the outer surface, and cannot be seen from the front with the keyboard cover 1 opened, so that the piano The appearance can be further improved.

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 can be used.
Although the embodiment is an example in which the present invention is applied to a keyboard lid of an upright piano, it is needless to say that the present invention may be applied to a keyboard lid of an upright electronic piano.

[0021]

As described above, the keyboard cover opening / closing control device of the present invention can stably open and close the keyboard cover and close it slowly, and can attach / detach the keyboard cover without using a tool or the like. And can be easily performed.

[Brief description of the drawings]

FIG. 1 shows an opening / closing control device for a keyboard lid of an upright piano according to a first embodiment of the present invention, with the keyboard lid opened.
It is a side view shown with the structure of the periphery.

FIG. 2 is a side view similar to FIG. 1, with the keyboard cover closed.

FIG. 3 is a partially enlarged side view showing an operation of the opening / closing control device.

FIG. 4 is a side view showing a keyboard cover opening / closing control device according to a second embodiment of the present invention, together with peripheral components.

FIG. 5 is a front view corresponding to FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Keyboard cover 3 Inner roof 10 Opening / closing control device 11 Shock absorber 12 Link mechanism 14 Shaft part 20 Opening / closing control device 21 Depression 22 Link mechanism 22a Link bar

Claims (1)

[Claims] 1. A keyboard cover opening / closing control device for controlling opening / closing of a keyboard cover rotatably attached to a back roof, wherein the back roof is detachably attached to a piano body, and one end of the back cover is attached to a piano body. Is housed in a recess formed on the side surface of the keyboard cover so as to be flush with the side surface, and is connected to the keyboard cover. An end is connected, and a shock absorber that brakes the keyboard cover via the link mechanism when the keyboard cover rotates in the closing direction, the shock absorber being the other end of the link mechanism An opening / closing control device for a keyboard cover, comprising a one-way torque type hydraulic damper having a rotatable shaft connected to a portion.