JPS58219Y2 - Pedal devices for pianos, etc. - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pedal device for a piano or the like that can set and maintain an actuated body such as a muffler in its operating state, such as a muffler pedal in an upright piano.

For example, the muffler mechanism built into an upright piano is such that when the muffler pedal is depressed, the muffler hangs between the hammer and the strings, and the hammer hits the strings through the muffler, thereby reducing the volume of the piano playing. It is made to reduce it appropriately.

By the way, for example, when trying to play the piano at home, due to problems with the housing situation, etc., one may be forced to play at a low tone.This is the case when the player is forced to play at a low tone throughout the entire performance. Therefore, unlike other damper pedals and soft pedals, the muffler pedal is not operated during a performance, but is normally operated before a performance to set and maintain the muffler in an operating state.

Conventionally, as shown in FIG. 1, such a muffler pedal device has a pedal metal 2 that is rotatably placed on a predetermined position on the upper surface of a bottom plate 1 about a vertical axis (not shown). One end of the pedal 3 is pivotally supported, and this pedal 3
The other end is passed through a two-stage pedal window 5 provided at a predetermined position on the front upper base 4 to appropriately protrude to the front side of the front base 4, and the pedal 3 is moved by the force of the return spring 6. There is known a muffler (not shown) configured to set a muffler (not shown) to an operating state by pressing the muffler against resistance and then moving it laterally and setting and holding the muffler in the depressed state.

However, such a muffler pedal device requires a two-step operation in which the pedal 3 is moved vertically and horizontally to set and maintain the muffler in the operating state or to release the muffler from this state. The pedal window 5 has a two-stage structure, and although the pedal 3 can be positioned in one of the two stages, the appearance is inferior.

This invention was made in view of the above circumstances, and provides a pedal device for pianos, etc., which can set and hold an actuated body in an activated state and release it with a simple operation, and which does not have an inferior appearance. The purpose is to
The actuated body can be set and maintained in the actuated state and released by simply stepping on the pedal.

An embodiment of this invention will be described below with reference to FIGS. 2 to 4.

In the figure, reference numeral 10 denotes a pedal, one end of which is attached to a pedal metal 12 placed at a predetermined position on the upper surface of the bottom plate 11 so as to be swingable in the vertical direction, and the other end is a square shaped pedal provided at a predetermined position of the front upper stand 13. It passes through the pedal window 14 and protrudes appropriately to the front side of the front base 13.

This pedal 10 is always urged counterclockwise in FIG. 2 by a spring 15, and is normally in the state shown by the solid line in FIG.

A bracket (not shown) is attached to a predetermined position on the upper surface of the bottom plate 11, and a hollow rectangular cylindrical guide member 16 is attached to this bracket with its center line oriented vertically.

Relief holes 17 and 17 are formed in one opposing wall of the guide member 16, respectively, to allow rotational movement of a cam body, which will be described later.

Further, a shaft 18 is horizontally suspended between predetermined locations on the other opposing wall of the guide member 16, and a cam body 19 is rotatably attached to this shaft 18.

The peripheral surface of this cam body 19 is a plane 20 a parallel to each other.
, 20b and these planes 20a.

The cam surface 20 has a point-symmetrical shape and has retaining surfaces 20C and 20d, which are formed by inclined surfaces of substantially ■-shaped side grooves provided between both ends of the cam surface 20a.

A sliding member 21 is disposed within the guide member 16 so as to be slidable in the vertical direction.

This sliding member 21 has projecting walls 23, 24, 25 extending vertically at four corners of one surface of a flat sliding member main body 22.
．． 26 are protruded from each other, and the upper and lower parts thereof are formed in a substantially U-shape with a thousand sides, and the main body 22 has a predetermined position that can be moved relative to the shaft 18. An escape hole 27 is formed.

Note that the pressing portion 23a formed from the lower end of one of the upper protruding walls 23 is set to be located below the pressing portion 24a formed from the lower end of the other upper protruding wall 24 by a predetermined amount. The upper end of one of the lower protruding walls 25 is set to be located a predetermined amount below the pressing portion 26a consisting of the upper end of the other lower protruding wall 26. .

Further, the spacing between the two lower protruding walls 25 and 26 is set to be larger than the spacing between the upper protruding walls 23 and 24 by a predetermined amount. 25.
26 is the side plane 20a of the cam body 19, 2
It is set to be slightly larger than the interval between 0 and b.

The upper end of a connecting rod 28 is attached to the lower part of this sliding member 21 via a pin 29, and the lower end of this connecting rod 28 is attached to a predetermined location on the pedal 10.
It is attached by 30.30.

Further, the lower end of an operating rod 31 is attached to the upper part of this sliding member 21 via a pin 32.
The upper end of the muffler is connected to a muffler actuation mechanism (not shown) of known construction.

The state indicated by the solid line in FIG. 2 shows the state where the pedal 10 is in the non-operating position, and in this state, the sliding member 21
is at the lifting limit point, and both protruding walls 25, 26 below it
The intermediate body 19 is positioned with its planes 20 a and 20 b oriented vertically.

When the pedal 10 is depressed from this state, the sliding member 21 descends, and on the way down, as shown in FIG.
is pressed to rotate the cam body 19 counterclockwise, and as shown in FIG. 4B, the pressing portion 23 of the sliding member 21 is pressed.
a engages with the bent portion of the engagement surface 20C of the cam body 19, and the rotation of the cam body 19 in the counterclockwise direction is prevented, so that the sliding member 21 is prevented from descending. The lowering limit point shown in FIG. 4B has been reached, and at this time the pedal 10 has been depressed to the maximum depression position shown by the dashed line in FIG.

Next, when the pedal 10 is stopped from being depressed in this state, the pedal 10 is rotated counterclockwise in FIG. 2 by the elastic force of the spring 15, and the sliding member 21
While rising, the engaging surface 20d of the cam body 19 is pushed by the pressing portion 26a on the way to rotate the cam body 19 counterclockwise, and as shown in FIG. 4C, the sliding member The sliding member 2
1 is locked in the middle of its movement range, and as a result, the pedal 10 is locked in the middle of its movement range, as shown by the two-dot chain line in FIG.

Next, when the pedal 10 is depressed again from this state, the sliding member 21 descends and the pressing portion 2
3 a pushes the flat surface 20 b of the cam body 19 to rotate the cam body 19 counterclockwise, and as shown in the fourth diagram, the pressing portions 23 a and 24 of the sliding member 21
By engaging the flat surface 20b of the cam body 19 and preventing the cam body 19 from rotating in the counterclockwise direction, the sliding member 21 is prevented from descending and reaches the descending limit shown in the fourth diagram. At this point, the pedal 10 has been depressed to the maximum depression position shown by the dashed line in FIG.

Next, when the pedal 10 is stopped from being depressed in this state, the pedal 10 is rotated counterclockwise in FIG. 2 by the elastic force of the spring 15, and the sliding member 21
While rising, as shown in FIG. 4E, the flat surface 20a of the cam body 19 is
Press to rotate this cam body 19 counterclockwise, and as shown in FIG.
a, 20b are in the vertical direction, and the sliding member 21 is relatively inserted between the lower protruding walls 25 and 26 to allow the sliding member 21 to rise. The member 21 reaches its original upward limit □, and at this time the pedal 10 has returned to its original non-operating position as shown by the solid line in FIG.

In this way, when the pedal 10 is depressed at the non-operating position shown by the solid line in FIG. 2 and then stopped, the pedal 10 is set and held at the actual depressed position shown by the two-dot chain line in FIG. From this state, when the pedal 10 is depressed again and the pedal operation is stopped, the pedal 10 returns to its original non-operating position as shown by the solid line in FIG.

In the above embodiment, as shown in FIGS. 4B and 4D, the cam body 19 is prevented from rotating counterclockwise, thereby preventing the sliding member 21 from descending. However, the present invention is not limited to this, and the sliding member 21 may be configured to be prevented from descending by, for example, preventing the pedal 10 from being depressed beyond the position indicated by the dashed line in FIG. good.

Note that with this configuration, it is not necessary to use the lower end of the other protruding wall 24 on the upper side of the sliding member 21 as the pressing portion 24a for pressing the cam body 19.

In the above embodiment, the lower end of the connecting rod 28 is fixed to the pedal 10 so that the pedal 10 and the sliding member 21 move up and down integrally, but the present invention is not limited to this. , for example, the lever 30 present on the upper surface side of the pedal 10 in FIG. Therefore, when the sliding member 21 is locked in the middle of its movement range as shown in FIG. 4C, only the pedal 10 is configured to return to the non-operating position shown by the solid line in FIG. It's okay.

As described above, according to the pedal device for a piano or the like according to this invention, the pedal is connected to a sliding member that can move up and down, and the sliding member is lowered from its upper limit by a rotatable cam body. Since the structure is configured so that the sliding member is stopped in the middle when rising later, and allowed to rise when the sliding member descends again from this state, the sliding member (i.e., the covered member) can be moved by simply depressing the pedal. It is possible to set and hold the operating body (actuating body) in the operating state, and also to release the operating state, making it easy to operate the pedal, and since the pedal window can be a simple rectangular shape, the appearance will not be inferior to that of a piano, etc. It has the following effects.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view showing an example of a conventional piano pedal device, FIG. 2 is a vertical sectional side view of the main part showing an embodiment of the piano pedal device according to this invention, and FIG. 3 is a partial perspective view showing an example of a conventional piano pedal device. Figure I
II-III line arrow views and FIGS. 4A to 4F are diagrams shown for explaining the operation. 10...Pedal, 11...Bottom plate, 13
...Front base, 14...Pedal window, 15
... Spring, 16 ... Guide member, 19
...Cam body, 21...Sliding member.

Claims (1)

[Scope of utility model registration request] A pedal arranged to be swingable in the vertical direction, a sliding member arranged above the pedal and moved up and down in conjunction with the swinging motion of the pedal, and a predetermined shape of the sliding member. The flat pressing portion is provided at each location, and the flat pressing portion is provided at a predetermined position midway within the movement range of the sliding member, and is rotatably provided around a horizontal axis, and the peripheral surface is covered with a pair of flat pressing portions. The cam body includes a cam body having a retaining portion and a point-symmetrical cam surface, and a biasing member that always biases the pedal and the sliding member upward, and the cam body includes: When the sliding member is lowered from its upper limit point, this lowering movement is allowed, and its cam surface is pushed by the upper pressing portion to rotate a predetermined angle in a predetermined direction, and then When the sliding member is raised, the flat pressing portion is engaged with one of the retaining portions to lock the sliding member in the middle of its movement range;
Next, when the sliding member is lowered again, this lowering movement is allowed, and its cam surface is pushed by the upper pressing portion to rotate in the same direction by a predetermined angle, and then the sliding member is raised. A pedal device for a piano, etc., characterized in that it is configured to allow this upward movement when the pedal is moved.