JPH0112316Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a key fulcrum device for a foot keyboard of an electronic musical instrument, such as an electronic organ.

In a conventional device of this type, as shown in the first diagram, a key supporting plate spring b fixed to the end of a key a is mounted on a fulcrum d fixed to a case c, and the key supporting plate spring b is mounted on a fulcrum d fixed to a case c, and is inserted through the bottom plate of the case c from below. Pass the screw e thus made through the hole in the leaf spring b, screw the nut f onto the screw e, and tighten the nut f.
The locking of the leaf spring b and the adjustment of the operating force of the key a were performed, but as mentioned above, the screw e was passed through the bottom plate from below, resulting in poor work efficiency. Also, when playing key a with your foot, left and right forces act on key a, and the nut f of set screw e loosens, making it easy for the operating force of key a to change, so it is necessary to tighten nut f each time. Another drawback was that noise was likely to occur.

The purpose of the present invention is to eliminate such drawbacks of the conventional device, and the substrate 1 has a notch 2 on the periphery, and the periphery is punched out on the back surface of the substrate 1, and a screw 3 is formed on the substrate 1. A screw hole 4 having a screw hole 4 formed therein and a fulcrum 5 are provided on the surface, and a key supporting plate spring 6 with one end attached to the end of the key 11 is placed on the fulcrum 5, and the other end of the key supporting plate spring 6 is mounted. A flange 8a is attached to the hole 7 provided in the
The flexible tube material 8 is inserted into the flexible tube material 8.
A screw 10 is inserted through the toothed washer 9 and screwed into the screw hole 4.

In FIG. 2, a base plate 1 is provided with fulcrums 5 and screw holes 4 corresponding to the number of keys 11. This fulcrum 5 is 2
It is formed by punching out the part between the grooves of the strip into a mountain shape,
The screw hole 4 is formed by providing notches 2 at, for example, four locations on the periphery as shown in FIGS. 3A and 3B, punching the periphery downward, and cutting a screw 3 on the circumferential surface.
The toothed washer 9 has tooth-shaped protrusions on the outer and inner circumferential edges of the ring.

As shown in FIG. 4, the board 1 is attached to the bottom plate of the case 12, and the key supporting plate spring 6, one end of which is attached to the end of the key 11, is placed on the fulcrum 5 provided on the board 1.
A flange 8a is provided in the hole 7 provided at the other end of the leaf spring 6.
A flexible tube 8 made of, for example, a soft synthetic resin having a cylindrical shape is inserted into the flexible tube 8, and a screw 10 is inserted into the flexible tube 8 through a toothed washer 9, and its tip is screwed into the screw hole 4 of the substrate 4.

From the state shown in the fourth figure, in order to adjust the operating force of the key 11, the screw 10 is inserted into the hole 4 as shown in the fifth figure.
When screwed in, the flexible tube 8 bends, the flange 8a bites into the toothed washer 9, and the lower end of the tube 8 bites into the notch 2 of the base plate 1. Therefore, the flexible tube 8 is completely fixed to the base plate 1, and the left and right movement of the key 11 is only caused by the rotation of the hole 7 of the leaf spring 6 around the tube 8. No loosening occurs, and the operating force of the key 11 does not change.

In this way, according to the present invention, the flexible tube member 8 having the flange 8a in the hole 7 of the key supporting plate spring 6 is used.
A toothed washer 9 is placed on this flange 8a, a screw 10 is inserted into these, and the tip thereof is screwed into a screw hole 4 provided in the substrate 1 having a notch 2 on the periphery, so that the conventional It has better workability than the previous one, and even if the key 11 is moved left and right with the foot during performance, there is no fluctuation in the operating force of the key 11 due to loosening of the screw 10, and no noise is generated.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of a conventional device, FIG. 2 is an exploded perspective view of an embodiment of the present invention, and FIGS. 3A and 3B are plan views of the screw hole 4 of the substrate 1. FIG. 3A is a cross-sectional view taken along the line B--B in FIG. 3A, FIG. 4 is a cross-sectional view of an embodiment of the present invention, and FIG. 5 is a cross-sectional view of the key after adjustment of the operating force. 1... Board, 2... Notch, 3... Screw, 4...
Screw hole, 5... Fulcrum, 6... Key support plate spring, 7...
... Hole, 8 ... Flexible tube material, 9 ... Toothed washer, 10
……screw.

Claims (1)

[Scope of utility model registration request] The substrate 1 has a notch 2 on its periphery, and the periphery thereof is punched out on the back surface of the substrate 1, and a screw hole 4 in which a screw 3 is formed is provided, and a fulcrum 5 is provided on the surface, and one end is attached to the fulcrum 5. A key supporting plate spring 6 attached to the end of the key 11 is placed, and a flexible tube 8 having a flange 8a is fitted into the hole 7 provided at the other end of the key supporting plate spring 6. Attach the screw 1 to the tube material 8 through the toothed washer 9.
0 is inserted into the screw hole 4 and is screwed into the screw hole 4.