JPS62191888A - Pedal lever retainer mechanism for piano - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a locking mechanism for a pedal lever in a soft tone mechanism of a piano. It is designed to be able to be locked quickly and reliably.

[Conventional technology]

The soft sound mechanism of a piano, especially an upright piano, is made by interposing a muffler felt between the metal strings and the hammer when the pedal is depressed, and the hammer hits the strings through the muffler felt, which makes the sound easier to play. It selectively reduces sound, and is generally constructed as shown in FIG.

That is, a pedal lever 1, commonly called a muffler pedal, has a rear end mounted on an axis by a bracket 3 disposed on the upper surface of a bottom plate 2 so that it can freely rotate vertically and also slightly move horizontally. A pedal window 5 is supported and the tip portion is provided at the lower part of the front platform 4 as an exterior member.
It penetrates through and protrudes from the front lower part of the piano body, and is configured so that when the pedal lever 1 is depressed, the L9 and mute mechanism 6 are operated.

The weak sound mechanism 6 includes a muffler frame 8 that extends commonly to all the strings 1''r of each pitch, a pair of left and right side frames 9, 10 that support the muffler frame 8, and km. t, a muffler felt 11 is placed on the muffler frame 8 in contact with the strings 7. The pair of side frames 9 and 10 are arranged on the inner surface of the piano body so as to be able to freely rotate in the vertical direction, and are given the ability to rotate upward by the return spring 14. =9 The muffler felt 11 and the normal hammer 12 are also locked at a high position, that is, at the normal performance position. The side frame 9 on the bass side also has a muffler hanger 15. 16 links, 17 pedals in total. Link 18. It is connected to the pedal lever 1 by a pedal hanger 19 or the like.

Therefore, when the pedal par 1 is depressed, each of the members 9, 10, 15 to 19 moves or rotates in the direction of the arrow, and the muffler frame 8 is lowered against the return spring 14. As a result, the muffler felt 11 is interposed between the hammer 12 and the string γ tonneau, and when the key (not shown) is pressed in this state, the hammer 12 hits the string γ fully through the muffler felt 11, resulting in a weak sound. A performance is held.

In addition, when playing in a soft tone, the pedal lever is 1'tJ! It is necessary to temporarily lock it in the inserted position. Therefore, as a retaining mechanism for the pedal lever 1, a notch 21 for the pedal mooring is provided at the lower part of one side edge of the pedal window 5, and the pedal lever 1, which is depressed, is further rotated in the horizontal direction to fit into the notch 21. I'm trying to lock it in place.

[Problem that the invention seeks to solve]

However, with such a conventional pedal lever locking mechanism, when switching from normal performance to soft performance, it is necessary to press down the pedal lever once and then move it laterally, so two operations are required and the switching operation is troublesome. So, pedal lever 1
The operation of the pedal lever 1 is not smooth, and the pedal lever 1 may sometimes hit the edge of the notch 21 due to insufficient depression and cannot be locked with a single operation.

Therefore, as a method to solve this problem, a locking mechanism using a so-called heart cam mechanism has been proposed, as seen in, for example, Japanese Utility Model Application Publication No. 50-54132, but such a mechanism has a complicated structure. This has the disadvantage that the number of parts increases, which causes an increase in costs.

In addition, in the pedal window 5 shown in Fig. 4, the lower part of the window 5 is open during normal performance, and the upper part is open during low-pitched performance. There is a risk that a mouse may enter the main body, and in particular, if a mouse enters, it may damage one of the internal mechanical parts of the piano, adversely affecting its function, and there are also problems such as contamination of the entry point.

[Means for solving problems]

The piano pedal lever locking mechanism according to the present invention was made to solve the above-mentioned problems, and is rotatable in the vertical direction and movable in the left and right directions, and penetrates a pedal window formed in an exterior member. A pedal lever that is normally locked in an initial position by abutting against the upper edge of the window, and a position diagonally below the initial position is a depressed locking position, and a return spring that biases the pedal lever upward. , a stop plate 'Jt is rotatably disposed on the inner surface of the exterior member and has a lever insertion hole or groove spaced apart from the center of rotation and through which the pedal lever passes; By setting the position above the depression-locking position of the pedal lever, the line of action of the force of the return spring, which the stop plate receives via the pedal lever when the pedal lever is depressed, is near the center of rotation. , and the stop plate locks the pedal lever in the depressing locking position.

[For production]

In this invention, since the pedal lever rotates as the stop plate rotates when the pedal is depressed, the lever operates smoothly, and there is no need for two operations, a push-down operation and a lateral displacement operation, to switch the lever. Operations can be performed quickly.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

1ryi is a side sectional view showing one embodiment of the pedal lever locking mechanism according to the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a view showing the pedal lever in the locked state It is. In the figure, the same components as those in FIG. 4 are designated by the same reference numerals, and their explanations will be omitted. In these figures, in this embodiment, the pedal window 5 is formed into a rectangular shape, and a stop plate 30 that closes the pedal window 5 is rotatably disposed on the inner surface of the gold front base 4 via a support shaft 31. This is different from the conventional mechanism described above.

The stop plate 30 is formed in a substantially fan shape, and a main part thereof is supported pivotally by the support shaft 31, and a lever insertion hole 32 is spaced apart from the support shaft 31 and through which the pedal lever 1 is inserted.
is formed. The pedal lever 1 is given a return behavior clockwise in FIG. 1 by the return spring 34, so that it is normally pressed against one end of the upper edge of the pedal window 5 as shown in FIG. 2 (through the entire C felt 35). , and is locked at the initial position.The support shaft 31 is positioned diagonally below the initial position of the pedal lever 1, that is, above the pedal locking position shown in FIG. 4, and is therefore provided above the upper edge of the pedal window 5 on the other end side.

Note that 36 is a shaft that supports the rear end of the pedal lever 10 so that it can be rotated up and down and also movable in left and right directions, and 37 is a felt that constitutes a lower limit stopper.

In such a configuration, when the pedal lever 1 is in its initial position, the stop plate 30 is pushed up by the lever (-1), so that the stop plate 30 moves to the second position as the center of the support shaft 31.
The figure is rotated and tilted counterclockwise. Due to this condition, when the pedal lever 1 is depressed, the lever 1
is lowered against the return spring 34. At this time, even if the pedal lever 1 is depressed vertically downward, since the lever 1 is inserted into the lever insertion hole 32, the second factor is caused to move around the support shaft 31 together with the stop plate 30. It rotates clockwise and moves to the depressing locking position as shown in FIG. 3, and comes into contact with one side edge 1a of the pedal window 5 and locks therein. In this depressing and locking position, since the pedal lever 1 and the lever insertion hole 32 are located at the center of the support shaft 31, the straight line connecting the center metals of these three parts 1.3L33 becomes vertical, and the pedal lever 1 is pressed. This coincides with the line of action of the force of the return spring 34, which is about to fall. In other words, since the line of action of the return spring 34 passes through almost the entire center of the support shaft 31, the stop plate 30 is locked in the downward rotation position by the spring 34, and when the pedal lever 1 is depressed, the stop plate 30 is locked at the locking position. to be locked.

On the other hand, when the pedal lever 1 is moved to the right in FIG. 3 in the depressed and locked state, the straight line connecting the lever 1 and the support shaft 31 is tilted, and as a result, the rotational direction component F1 of the force F of the return spring is An axial component force F2 is generated, and the rotational component force F causes the stop plate 30 to rotate counterclockwise in FIG. 3 and return to the initial position shown in FIG. 2. Therefore, the pedal lever 1 also rotates upward together with the stop plate 30 and returns to its initial position.

Thus, according to the pedal lever locking mechanism having such a configuration, since it is only necessary to provide the rotatable stop plate 30, the structure is extremely simple, the number of parts is small, and assembly is simple and easy. be. Moreover, pedal lever 1
is moved diagonally downward from the initial position to the depression stop position α by rotational movement, so there is no need to perform two-way operations such as pressing down downward and then moving it horizontally, which is different from conventional mechanisms. The locking force is simple and smooth, and the pedal lever 1 can be quickly and precisely moved to the depressing locking position in nine rows. Moreover, since the pedal window 5 does not require the entire notch to be used, it has a simple shape and is small, making the window 5 easy to manufacture. Further, by setting the stop plate 3 (1-1) to an appropriate size, the entire pedal window 5 can be always covered by the stop plate 30, so that the intrusion of rats, insects, etc. can be easily prevented.

In addition, in the above embodiment, the lever insertion hole 32 is provided in the stop plate 30.
Although the case where the lever insertion groove is formed is described as “f”, the present invention is not limited to this, and a U-shaped lever insertion groove may be used.

``Also, if necessary, use the spring 40 to move the stop plate 30 to the third position.
By applying force in the clockwise direction in the figure, or by appropriately setting the relative relationship between the center of rotation of the stop plate 300 and the center of gravity, the pedal lever 1 is prevented from unexpectedly returning to rotation due to slight vibrations, etc. at the depressing and locking position. Good too.

〔Effect of the invention〕

As explained above, according to the piano pedal lever locking mechanism according to the present invention, the structure is simple, the locking operation is quick and smooth, the pedal lever can be reliably locked in the depressed position, and the pedal window can be easily locked. Since there is no need to provide a cutout for lever mooring, the shape of the window is simple, making it easy to back up, and it is also very effective in preventing the intrusion of rats and insects. be.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing one embodiment of this invention, and Fig. 2 (
2. Fig. 1 is a sectional view taken along the line ■-■. Fig. 3 is a diagram showing the metal weight in a depressed and locked state. Fig. 4 is a perspective view showing a conventional low sound mechanism. 1. Pot/pedal lever, 4. Φφ exterior member (front base), 5. Groan-- pedal window, 30. Fist/e-stop plate, 31.
... Rotation center (support shaft), 32 ... Lever insertion hole, 34 ... Return spring.

Claims (1)

[Scope of Claims] The pedal is rotatable in the vertical direction and movable in the horizontal direction and passes through a pedal window formed in the exterior member, and is locked at the initial position by normally abutting the upper edge of the window. a pedal lever whose depressing locking position is diagonally downward from the pedal lever; a return spring which urges the pedal lever upward; and a return spring which is rotatably disposed on the inner surface of the exterior member and is spaced apart from the center of rotation. and a stop plate provided with a lever insertion hole or groove through which the pedal lever passes, and by setting the center of rotation of the stop plate above the depression locking position of the pedal lever, the pedal lever can be moved. The line of action of the force of the return spring, which the stop plate receives via the pedal lever during a depression operation, passes near the center of rotation, so that the stop plate locks the pedal lever at the depression locking position. A piano pedal lever locking mechanism characterized by: