JP3517566B2 - Keyboard lid opening and closing mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard lid opening / closing mechanism for opening and closing a keyboard lid in a grand piano, an upright piano or the like.

[0002]

2. Description of the Related Art For example, in an upright piano as shown in FIG. 6, a keyboard 3 is mounted on a shelf board 2 between arms 1 on both sides. Beats 4 on both sides of the keyboard 3
Are arranged, and these are covered by the keyboard cover 5. The keyboard lid 5 has a hinge 6 as shown in FIG.
Is hinged to the piano body side (back roof 7) and is rotatably supported above the keyboard 3 as indicated by the arrow.

When the keyboard lid 5 is opened and closed, the player usually holds his / her hand near the front edge of the keyboard lid 5 to rotate the keyboard lid 5. In that case, momentum tends to be generated in the vicinity of the final stroke of the opening / closing stroke of the keyboard lid 5, and if the keyboard lid 5 is excessively urged, not only the hinge 6 is unnecessarily loaded but also the keyboard lid 5 is vigorously urged. When closed, a loud clicking sound is produced. In addition, a finger may be mistakenly caught in the keyboard lid 5. Therefore, it is necessary to carefully open and close the keyboard lid 5.

[0004]

In the conventional keyboard lid opening / closing mechanism of this type, an oil damper is mounted inside the keyboard lid. According to the keyboard lid opening / closing mechanism provided with this oil damper, a cushioning action is provided when the keyboard lid is opened / closed, and finger pinching or the like is prevented to ensure safety. However, the configuration using the oil damper has a problem that the cost is high and the structure is complicated and bulky.

In view of such circumstances, it is an object of the present invention to provide a keyboard lid opening / closing mechanism which realizes smooth and proper opening / closing operation of the keyboard lid with a simple structure and ensures high safety.

[0006]

A keyboard lid opening / closing mechanism of the present invention is an opening / closing mechanism for opening and closing a keyboard lid rotatably supported on an upper part of a keyboard, the keyboard lid being provided at an appropriate position on the keyboard lid. There is provided a shock absorbing means including a piston rod that operates in conjunction with opening and closing of the lid, a resistance generating member attached to the piston rod, and a stopper that abuts on the resistance generating member to generate a resistance force. It is characterized in that a resistance load is applied near the final stroke of the opening / closing stroke.

Also, in the keyboard lid opening / closing mechanism of the present invention,
The piston rod is connected to the keyboard lid via a link mechanism. Further, in the keyboard lid opening / closing mechanism of the present invention, the buffering means is attached to both or one of the time signatures arranged at the side ends of the keyboard. Further, in the keyboard lid opening / closing mechanism of the present invention, the resistance generating member is formed of an elastic body.

According to the present invention, a cushioning means is used to apply a resistance load near the final stroke of the opening / closing stroke of the keyboard lid at a proper position inside the keyboard lid, and exhibits a buffering action when the keyboard lid is opened / closed. , Prevents pinching of fingers and secures safety. In this cushioning means, the resistance generating member is made of an elastic body, that is, has an extremely simple structure. Therefore, the cost can be kept low and a compact structure can be realized.

[0009]

DETAILED DESCRIPTION OF THE INVENTION Referring to FIGS.
A preferred embodiment of the keyboard lid opening / closing mechanism according to the present invention will be described with reference to FIGS. FIG. 1 shows around the keyboard lid opening / closing mechanism in the present invention. In this embodiment, the keyboard 3 is mounted on the shelf 2 between the arms 1 of the upright piano. Time signatures 4 are arranged at both ends of the keyboard 3, and these are covered by a keyboard lid 5. The keyboard lid 5 is rotatably supported above the keyboard 3 as indicated by the arrow in FIG.

The keyboard lid opening / closing mechanism is provided with a buffer means 10 at a proper position inside the keyboard lid 5. The cushioning means 10 can be attached to both or one of the left and right time signatures 4 arranged at the side end of the keyboard 3. The buffer means 10 includes a piston rod 11 that operates in conjunction with opening and closing of the keyboard lid 5, a resistance generating member 12 attached to the piston rod 11, and a stopper 1 that abuts on the resistance generating member 12 to generate a resistance force.
Includes 3 and 3.

The piston rod 11 is supported by the brackets 13a and 13b in front of and behind the stopper 13 so that it can be inserted therethrough.
As shown by the double-headed arrow, it moves before and after a predetermined stroke. The piston rod 11 is also connected to the keyboard lid 5 via a link 14. The resistance generating member 12 is preferably made of an elastic body such as a rubber tube and attached to a predetermined portion of the piston rod 11. Therefore, the resistance generating member 12 can move back and forth together with the piston rod 11.

In this case, as shown in FIG. 2, a band 15 is wound around the central portion of the resistance generating member 12, and the band 15 is attached to the piston rod 11 by appropriately tightening it with a screw / nut 16. In addition, screw / nut 1
By adjusting the loosening force of the band 15 by 6, the resistance generating member 12 is not completely fixed to the piston rod 11, that is, when a load of a certain amount or more is applied.
Is set to be movable in the axial direction of the piston rod 11.

The keyboard lid opening / closing mechanism of the present invention is constructed as described above, and its operation will be described below. For example, when the keyboard lid 5 is opened, the piston rod 11 is pulled by the link 14 and moves as shown by the arrow in FIG. Then, the resistance generating member 12 contacts the bracket 13a as shown in the drawing immediately before the keyboard lid 5 is completely opened.
When the keyboard lid 5 is further opened, the resistance generating member 12 and the piston rod 1 whose positions are regulated by the bracket 13a
A slip occurs during the period of 1 and frictional resistance is generated until it is completely opened as shown in FIG. During this period, the resistance generating member 1
2 moves relative to the piston rod 11, that is, moves 1 toward the bracket 13b side.

When the keyboard lid 5 is thus opened, a resistance load due to frictional resistance is applied by the resistance generating member 12 near the final stroke of the movement stroke of the piston rod 11.
Immediately before the keyboard lid 5 is fully opened, a suitable cushioning action is exerted, so that the keyboard lid 5 can be smoothly and accurately rotated.

On the other hand, when the keyboard lid 5 is closed, the piston rod 11 is pushed by the link 14 and moves as shown by the arrow in FIG. 4 (A). Then, the resistance generating member 12 contacts the bracket 13b as shown in the drawing immediately before the keyboard cover 5 is completely closed. When the keyboard lid 5 is further closed, the resistance generating member 1 whose position is regulated by the bracket 13b
2 and the piston rod 11 caused a slip, and FIG.
Friction resistance is generated until it is completely closed as shown in. During this time, the resistance generating member 12 moves relative to the piston rod 11, that is, moves to the bracket 13a side by l.

When the keyboard lid 3 is closed in this manner, also in this case, a resistance load due to frictional resistance is applied by the resistance generating member 12 near the final stroke of the moving stroke of the piston rod 11. In this way, by exhibiting an appropriate cushioning function immediately before the keyboard lid 5 is closed, a smooth and accurate pivoting operation of the keyboard lid 5 can be obtained, and finger pinching or the like can be prevented to ensure safety. it can.

FIG. 5 shows an example in which the keyboard lid opening / closing mechanism is vertically arranged. The structure itself of the keyboard lid opening / closing mechanism is substantially the same as that of the above-mentioned embodiment, but in this example, for example, a mounting hole or a recess 4a is provided at an appropriate position of the time signature 4 and arranged vertically as illustrated. To do. Even in the case where the keyboard lid 5 is arranged vertically as described above, a smooth and accurate pivoting operation of the keyboard lid 5 can be obtained by exerting an appropriate cushioning action when the keyboard lid 5 is opened and closed, and high safety is ensured. You can

In the above embodiment, the resistance generating member 12 is not limited to a rubber tube or the like, but may be made of an elastic body using, for example, a synthetic resin material or a wood material,
It is possible to obtain the same effect as that of the above embodiment.

[0019]

As described above, according to the present invention, in this type of keyboard lid opening / closing mechanism, a resistance load is applied to a proper position inside the keyboard lid near the final stroke of the opening / closing stroke of the keyboard lid by the buffer means. , It has a cushioning effect when opening and closing the keyboard lid and prevents finger pinching, etc. to ensure high safety. In addition, the structure is extremely simple, and there are advantages such that the cost can be reduced and a compact structure can be realized.

[Brief description of drawings]

FIG. 1 is a sectional view showing the vicinity of a keyboard lid opening / closing mechanism in the present invention.

FIG. 2 is a perspective view showing an example of a resistance generating member according to the present invention.

FIG. 3 is a side view showing the operation of the keyboard lid opening / closing mechanism according to the embodiment of the present invention when it is opened.

FIG. 4 is a side view showing an operation when the keyboard lid opening / closing mechanism according to the embodiment of the present invention is closed.

FIG. 5 is a cross-sectional view showing a configuration example in which a keyboard lid opening / closing mechanism in a modified example of the present invention is arranged vertically.

FIG. 6 is a perspective view showing an example of a piano having a keyboard lid opening / closing mechanism.

FIG. 7 is a side sectional view showing an example of a piano having a keyboard lid opening / closing mechanism.

[Explanation of symbols]

1 arm 2 shelves 3 keyboards 4 time signature tree 5 keyboard lid 6 hinges 7 Piano body side (back roof) 10 Buffer means 11 piston rod 12 Resistance generating member 13 Stopper 14 links 15 bands 16 screws / nuts

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Claims (4)

(57) [Claims] 1. An opening / closing mechanism for opening and closing a keyboard lid rotatably supported on the upper part of the keyboard, wherein a piston rod which is interlocked with opening and closing of the keyboard lid is provided at an appropriate position of the keyboard lid. A resistance generating member attached to the rod and a cushioning means including a stopper that abuts on the resistance generating member to generate a resistance force are provided, and a resistance load is applied near the final stroke of the opening / closing stroke of the keyboard lid. A keyboard lid opening / closing mechanism characterized in that 2. The keyboard lid opening / closing mechanism according to claim 1, wherein the piston rod is connected to the keyboard lid via a link mechanism. 3. The keyboard lid opening / closing mechanism according to claim 1, wherein the buffering means is attached to both or one of the time signatures arranged at the side ends of the keyboard. 4. The keyboard lid opening / closing mechanism according to claim 1, wherein the resistance generating member is made of an elastic body.