JPH1165552A - Fallboard opening/closing device of upright piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent injuries to fingers by applying the energizing force in a direction onto which a fallboard opens on the fallboard, thereby reducing the weight of the fallboard and making it possible to lightly open and close the fallboard. SOLUTION: This fallboard opening/closing device of an upright piano is constituted by connecting a fallboard 6 and a fallboard back section 9 by means of hinges 10, turnably supporting the fallboard 6 at between both right and left arms 3 by means of supporting arms 5 and drawably supporting the fallboard back section 9 on rails 11 which are arranged below an upper panel 2 of a piano body 1 via supporting rollers 12. Press-contacting bodies 18 are mounted at the rear surface part 9a of the fallboard back section 9 movably in a transverse direction intersecting with the moving direction of the fallboard back section 9. Traction levers 22 which allow the contact of the rear surface parts on free end 22a side with these press-contacting bodies 18 are pivotally fitted to the arms 3 and stoppers 23 for regulating the turning angle of the traction levers are disposed on the turning passage of the traction levers 22. The means (coil springs 29) for pulling the traction levers 22 toward the stopper 23 side are disposed.

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 and closing device for an upright piano, which can open and close a keyboard cover lightly and does not injure a finger.

[0002]

2. Description of the Related Art Referring to FIG. 6, a conventional keyboard cover opening / closing device used in an upright piano will be described. At the lower end of the arm 3, a horizontal shelf 4 extending in the front-rear direction is fixed. A keyboard cover 6 is rotatably supported between the arms 3 via a support arm 5, and a support shaft 7 is provided at the front end of the keyboard cover 6 at a position where the keyboard cover 6 is closed. At one time, it comes into contact with a spigot 8 secured on the front end of the shelf 4.

[0003] An inner circle 9 is connected to a rear end of the keyboard cover 6 by a hinge 10, and the inner circle 9 is supported on a slightly inclined rail 11 disposed below the upper front plate 2 of the piano body by supporting rollers. 12 and is supported so as to be able to be pulled out.
Is the bracket. The Okumaru 9 travels on the rails 11 by supporting rollers along with the opening operation of the keyboard cover 6, and can move between a forward position indicated by a solid line and a retracted position indicated by a virtual line. Reference numeral 14 denotes a stopper for regulating the retreat position of the Okumaru 9, 15 denotes a keyboard press, and 16 denotes a mounting bolt for the keyboard press 15.

[0004] At the time of maintenance of the piano, the distal end of the support arm 5 has a bifurcated attachment portion 5 so that the keyboard cover 6 and the Okumaru 9 can be integrally removed from the piano body 1.
The mounting portion 5a is formed on the support shaft 7 and is freely detachable. At the time of fitting to the support shaft 7, the pivot 1
7b eliminates the problem that the chuck 17 rotatably attached to the support arm 5 abuts on the support shaft 7 and the support arm 5 comes off from the support shaft 7. Reference numeral 17a denotes a projection provided on the chuck 17, which is functionally attached to and detached from the inside of the attachment portion 5a so that the attachment portion 5a of the support arm 5 can maintain a fitted state with the support shaft 7. .

[0005]

In the above-mentioned conventional piano, when the keyboard cover 6 is opened and closed, the weight of the keyboard cover 6 must be directly supported by hand, and the keyboard cover 6 is considerably heavy for a small child. In particular, when closing the keyboard cover 6, there is a risk that a finger may be accidentally caught between the front end of the keyboard cover 6 and the mouthpiece 8 to cause injury. The present invention solves such a problem, and provides a biasing force in a direction to open the keyboard lid, thereby reducing the weight of the keyboard lid, opening and closing the keyboard lid lightly, and preventing the injury even if fingers are pinched. It is an object of the present invention to provide a keyboard cover opening / closing device.

[0006]

In order to achieve the above object, an upright keyboard cover opening / closing device characterized by the present invention is characterized in that the keyboard cover and the Okumaru are connected by hinges, and the keyboard cover is provided with a pair of supporting members. The arm is rotatably supported between the left and right arms via the arm, and the Okumaru is supported via a support roller on a rail arranged below the upper front plate of the piano body so that it can be pulled out. In an upright piano keyboard cover opening / closing device, a crimping body is attached to the back of the Okumaru so as to be movable in a horizontal direction intersecting the moving direction of the Okumaru, and the back of the free end is applied to this crimping body. A tow lever that can be contacted is pivotally attached to the arm, and a stopper that regulates the turning angle of the towing lever is provided on the turning path of the towing lever,
It is provided with traction means for pulling the traction lever in the direction of the stopper.

As a traction means in this configuration, a tension spring having a lower end attached to the piano body 1 is connected to a wire which is wound around a guide roller and one end of which is connected to a traction lever. When the position is between the closed position and the intermediate half-open position, the tension spring applies an opening force to the keyboard cover. When the cover reaches the half-open position, the tow lever hits the stopper and stops, and the force in the opening direction by the tension spring does not act on the cover. As a matter of course, in order to pull the pulling lever, connecting the weight to the wire or attaching an oil damper to the pulling lever is also included in the present pulling means.

[0008]

Embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 5 are longitudinal side views showing an embodiment of the present invention. The same parts as those in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.

A crimping body 18 is attached to the back surface 9a of the Okumaru 9 so as to be movable in a lateral direction intersecting with the moving direction of the Okumaru 9, and 19 is a support frame for the crimping body 18. It is slidably supported by the support frame 19. Support frame 1
A fastening nut 20 for fixing the crimping body 18 to the sliding position is attached to 9, and the crimping body 18 is always held at a position protruding from the side surface of the inner circle 9. In this example,
The pressure-bonding body 18 is a roller, and is pivotally mounted on a sliding plate 21 slidably mounted on the support frame 19.

On the other hand, the arm 3 facing the side of the Okumaru 9
The concave portion 3a is provided with a rotatable traction lever 22 urged by traction means to be described later and a stopper 23 for regulating the rotation angle of the traction lever 22.
The lower end of the towing lever 22 is pivotally connected 24 to the arm 3 so that the back portion of the free end 22 can abut the crimping body 18 at all times (except for the towing lever 22 being stopped by the stopper 23). It is designed to.

More specifically, an example of the pulling means will be described. A hook 25 is fixed to the back surface of the pulling lever 22, one end of a wire 26 is connected to the hook 25, and the wire 26 is connected to a pair of guide rollers 27 and 28. It is extended and connected to the tension spring 29. The lower end of the tension spring 29 adjusts the tensile force of the tension spring 29 by an adjustment bolt 30, a nut 31 screwed to the bolt 30, and a support plate 32 movably supporting the adjustment bolt 30, as usual. It is attached to the main body 1 (in the case of the drawing, the side of the arm 3) so as to be able to do so.

According to the above configuration, even when the keyboard cover 6 is in the closed position, the towing lever 22 and the towing lever 2
The keyboard cover 6 is placed under the urging force of a tension spring 29 via the crimping body 18 and the Okumaru 9 that are in contact with the crimping member 2. The spring force of the tension spring 29 with respect to the traction lever 22 is adjusted by moving the adjustment bolt 30 with respect to the support plate 32 fixed to the arm 3 by the nut 31 and adjusting the lifting position. In addition. The above-described recess 3a of the arm 3 is formed in a size that allows the rotation of the traction lever 22.

Next, the operation of the above-described keyboard cover opening / closing device will be described. When the keyboard cover 6 is closed as shown in FIG. 1, the pulling lever 22 is in a substantially vertical state, and the tension spring 29 is extended to pull the lower end of the wire 26 with the strongest tensile force. Therefore, the pulling force of the tension spring 29 acts as an urging force in the opening direction together with the back circle 9 when the keyboard cover 6 is opened, thereby reducing the weight of the keyboard cover 6 and reducing the weight of the keyboard cover 6 with a small force. Will be able to open.

That is, when the keyboard cover 6 is between the closed position and the half-open intermediate position, the tension spring 29
As a result, an opening force is applied to the keyboard cover 6, and the opening operation of the keyboard cover 6 during that time can be lightened by the rotation of the pulling lever 22. Then, as shown by the solid line in FIG.
Reaches the half-open position, the towing lever 22 hits the stopper 23 and stops. From the stop position of the tow lever 22, the force in the opening direction by the tension spring 29 is not applied to the keyboard 6 from the stop position, but the opening operation after half-opening can be easily performed, and as shown by the phantom line in FIG. 6 is fully opened when the support roller 12 of the Okumaru 9 hits the stopper 14.

When the keyboard cover 6 at the fully open position is closed, the towing lever 22 hits the stopper 23 and stops at the stage from the fully open position to the semi-closed position of the keyboard cover 6, so that the pulling force of the tension spring 29 is applied. Does not act on the keyboard cover 6. Therefore, the force for reducing the weight is not applied to the keyboard lid 6 side, but at the initial stage of the closing operation, the keyboard lid 6 faces upward on the hinge 10 which is a pivotal connection with the Okumaru 9, The force for rotating the keyboard cover 6 is small.

In this closing operation, when the keyboard cover 6 reaches the semi-closed position shown by the solid line from the fully open position shown by the imaginary line in FIG.
Since the tensile force of the tension spring 29 acts on the press-bonded body 18 via the traction lever 22, the tension force of the tension spring 29 reduces the weight of the keyboard lid 6 via the back circle 9 in the subsequent closing operation of the keyboard lid 6. It works to make it work. For this reason, the tension spring 29 expands as the keyboard lid 6 approaches the closing position, the tensile force increases, the force for reducing the weight of the keyboard lid 6 gradually increases, and the keyboard lid 6 is lightly closed with a small force. And the keyboard cover 6
An accident such as injuries caused by pinching a finger between the front end of the car and the mouth stick 8 does not occur.

When performing maintenance such as tuning, when the keyboard cover 6 is fully opened and the back circle 9 is at the retracted position, the tightening nut 20 is loosened and the crimped body 18 is moved to the back 9a side of the back circle 9. The crimping member 18 is moved so that the crimping member 18 is removed from the rotation passage of the pulling lever 22 as shown by a virtual line in FIG. Next, the Okumaru 9 is pulled out, and the Okumaru 9 is superimposed on the keyboard cover 6 which has returned to the closed position. Thereafter, as shown in FIG. By pulling apart 5, the keyboard lid 6 can be removed together with the back circle 9.

[0018]

The present invention is as described above, and the force of the traction means for pulling the traction lever is applied as a force in the direction to open the keyboard lid, thereby reducing the weight of the keyboard lid and opening and closing the keyboard lid with a small force. Therefore, it is possible not only to easily and easily open the keyboard cover, but also to eliminate the risk of injury due to the finger being pinched between the front end of the keyboard cover and the mouthpiece during the closing operation of the keyboard cover.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a partially omitted longitudinal side view in a state where a keyboard cover is closed.

FIG. 2 is a partial vertical sectional side view showing an operation state of a main part in FIG.

FIG. 3 is a partial plan view showing a related configuration between an Okumaru and a traction lever at a solid line position in FIG. 2;

FIG. 4 is a partial rear view showing a related configuration between an Okumaru and a traction lever at a solid line position in FIG. 2;

5 is a partial longitudinal sectional side view of a main part illustrating a state in which a keyboard cover and an Okumaru are removed from the one shown in FIG. 1;

FIG. 6 is an example of a conventional upright piano, and is a vertical sectional side view similar to FIG. 1 showing a main part thereof.

[Explanation of symbols]

1 is a piano body, 2 is an upper front plate, 3 is a brace, 4 is a shelf, 5
Is a support arm, 6 is a keyboard cover, 7 is a support shaft, 9 is Okumaru, 9a
Is a back part, 10 is a butterfly plate, 11 is a rail, 12 is a support roller, 18 is a crimping body, 22 is a pulling lever, 22a is a free end, 23 is a stopper, 24 is a pivotal part, 26 is a wire, 27, 28 Is a guide roller, and 29 is a tension spring.

Claims (2)

[Claims] 1. A keyboard cover and an Okumaru are connected by a hinge,
The keyboard lid is rotatably supported between the left and right arm trees via the support arm, and the Okumaru can be pulled out via the support rollers on the rail located below the upper front plate of the piano body In the keyboard lid opening / closing device for an upright piano supported on a back end of an Okumaru, a crimping body is attached movably in a transverse direction intersecting the moving direction of the Okumaru, and a free end side of the crimping body is attached to the crimping body. A tow lever that can contact the back surface is pivotally attached to the arm, and a stopper is provided on the turning path of the towing lever to regulate the turning angle of the towing lever, and the towing lever is moved in the direction of the stopper. A lid cover opening / closing device for an upright piano, comprising a pulling means for pulling the lid. 2. A pulling spring having a lower end attached to the piano body 1 side is connected to a wire which is stretched over a guide roller and one end of which is connected to the pulling lever, as a pulling means of the pulling lever. The keyboard lid opening / closing device for an upright piano according to claim 1, wherein