JPS6336361Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a keyboard switch used in electronic musical instruments, etc., and aims to provide a keyboard switch that can easily incorporate a compression coil spring disposed between the inner surface of the key and the frame.

Conventional keyboard switches for electronic musical instruments and the like have been constructed as shown in FIG.

That is, a protruding piece 5 on the inner surface of the key 4 whose tip part is engaged with the window part 3 of the bent part 2 at one end of the frame 1;
A compression coil spring 7 is stretched between some of the protrusions 6 of the frame 1 so as to constantly apply an upward bias to the other end of the key 4. Of course, this key 4 is provided with a stopper 8, and the amount of upward rotation of the other end of the key 4 is regulated by the frame 1.

In such a configuration, as shown in FIG. When fitting, the compression coil spring 7, which is vertically installed in the key 4, must be slightly tilted onto the protrusion 6 of the frame 1 at the other end to fit, and then the spring must be assembled.

This makes the work extremely difficult, and there are cases where the compression coil spring 7 does not completely fit into the protrusion 6 of the frame 1 as shown in FIG.
In some cases, it got stuck between the bent part 2 and was incorporated.

The present invention aims to eliminate these conventional drawbacks and to provide a keyboard switch in which a compression coil spring can be reliably incorporated.

In order to achieve the above object, the present invention has a structure in which the root part of the protrusion on the inner surface of the key into which the compression coil spring is fitted is inclined so that the compression coil spring is inclined toward the bent part side of the frame. can be reliably and easily assembled into the protruding part of the frame.

The present invention will be explained below with reference to FIG. 4 of one embodiment. A frame 9 has an upwardly bent portion 10 formed at one end thereof, and a plurality of window portions 11 are formed in this bent portion 10 at regular intervals.

A key 12 made of synthetic resin or the like is attached to such a frame 9. This key 12 is provided with two locking pieces 13 at its tip, and a locking recess 14 is formed on the upper surface of the locking piece 13, which is fitted into the upper part of the window 11 and engaged. When the compression coil spring 17 is fitted between the protruding portion 15 of the frame 9 and the root portion 16a of the inner surface of the key 12, the lower end of the compression coil spring 17 tilts toward the bent portion 10 of the frame 9. A compression coil spring 17 is fitted between the protrusions 16 inclined in this manner to apply a return force to the other end of the key 12.

Of course, a stopper piece 18 is provided near the other end of the key 12 and protrudes to the bottom surface through a through hole 19 of the frame 9, and cushioning material 20 provided on the upper and lower surfaces of this through hole 19 prevents noise. It is locked to prevent it from occurring.

That is, this stopper piece 18 allows the key 12 to be
The rotation return position of the key 12 is regulated, and the amount of rotation of the key 12 is also regulated by the cushioning material 20.

With the above configuration, as shown in FIG. 5, when the compression coil spring 17 is fitted into the protrusion 16 on the inner surface of the key 12, the compression coil spring 17 is tilted by θ° and engaged. The lower end of the compression coil spring 17 can now be easily and reliably assembled into the protrusion 15 of the frame 9 without any adjustment.

Since the keyboard switch of the present invention is constructed as described above, the engagement of the compression coil spring with the protruding part of the frame is ensured, making the assembly work more efficient and providing stable quality. The following effects can be obtained, and it is of great practical value.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional keyboard switch, Fig. 2 is a sectional view of the main parts showing the same assembly, Fig. 3 is a sectional view of the main parts showing the disadvantages of the same assembly, and Fig. 4 is the keyboard of the present invention. FIG. 5 is a cross-sectional view showing one embodiment of the switch, and FIG. 5 is a cross-sectional view of essential parts showing the state when the switch is assembled. 9... Frame, 10... Bent portion, 11... Window, 12... Key, 13... Locking piece, 14... Locking recess, 15... Projection, 16... Projection piece, 16a …
...Root part, 17...Compression coil spring.

Claims (1)

[Scope of utility model registration request] A compression coil spring is arranged between the protrusion on the inner surface of the key whose tip is engaged with the window in the bent part of one end of the frame and the protrusion on the frame, and the base of the protrusion on the inner surface of the key is inserted into the window. A keyboard switch characterized in that a compression coil spring is fitted so that the lower end of the compression coil spring is inclined toward a bent portion of a frame.