JPS5848714Y2 - Key guide device for keyboard instruments - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a key guide device for a keyboard instrument.

As shown in FIGS. 1A and 1H, in a conventional key guide device for a keyboard instrument, a guide bush 2 made of rubber or the like is attached to the bent part of a guide pin 1 fixed to the chassis. It fits into the lower groove part of 3.

Although this guide bushing 2 uses a slippery resin or coats the surface with a slippery resin to improve the slippage with the inner wall of the lower groove of the key 3, it still does not slip well. Its outer diameter is made slightly smaller than the width of the lower groove of the key.

For this reason, the key 3 tends to be prone to play from side to side when operated, and also has the drawback of causing twitching and the like.

Furthermore, in order to eliminate this drawback, the one shown in FIG. 2 has also been proposed.

The guide bush 2 is provided with four protrusions 4, and the guide bush 2 is inserted into the guide pin 1 so that the protrusions 4 come into contact with the inner wall of the lower groove of the key 3.

(Fig. 2B) Since the key 3 is guided by the protruding piece 4 of the guide bush 2 which is easy to bend, it is possible to move the key from side to side when operating the key without increasing contact friction compared to the one in Fig. 1. However, since the guide bushing 2 has directionality and when installed as shown in Fig. 2 C, the protruding piece 4 does not come into contact with the inner wall of the groove of the key 3. There was also a drawback that it took a lot of effort to attach it to pin 1.

The present invention aims to eliminate the drawbacks of the conventional key guide device, and the guide pin is provided with a notch, and a guide bushing that fits into the guide pin is attached to the notch. A feature is that a protrusion is provided on the inner wall of the key groove so as to be in contact with the recess.

FIGS. 3A and 3B show a key guide device showing an embodiment of the present invention.

A U-shaped notch 5 is provided at the bent portion of the guide pin 1, and a cylindrical guide bushing 2 is fitted into the guide pin 1 and mounted at the position of the notch 5.

A protrusion 6 is provided on the inner wall of the lower groove of the key 3 in the direction of movement of the key 3 so as to be in contact with the recessed portion of the guide bushing 2 which has been deformed along the shape of the guide pin 1.

Thus, when the key 3 is pressed, the key 3 is guided by the guide bush 2 by the projection 6 and moves downward.

The protruding parts on both sides of the recessed part of the guide bushing 2 are in contact with the inner wall of the groove of the key 3, but they do not have to be in contact with the inner wall of the groove of the key 3, and the protruding parts on both sides of the recessed part
Instead of the U-shape, a ■-shape and other various modifications can be adopted.

As described above, according to the present invention, there is no left-right rattling or wobbling when the key is operated, and there is no directionality when attaching the guide bushing to the guide pin, so workability is good, and the guide bushing is Since it is attached to the notch of the guide pin, it does not shift and has the advantage of smooth downward movement of the key.

[Brief explanation of drawings]

Fig. 1 is an example of a conventional key guide device, Fig. 1A is an external perspective view, Fig. 1B is a sectional view, Fig. 2 is another example of a conventional key guide device, and Fig. 2A is a perspective view. , FIG. 2B and C are cross-sectional views, FIG. 3 shows an embodiment of the present invention, FIG. 3A is a cross-sectional view taken along line A-A of FIG. 3B, and FIG. A's B
- It is a sectional view taken on the B line. 1... Guide pin, 2... Guide bush, 3... Key, 5... Guide pin notch, 6... Projection.

Claims (1)

[Scope of utility model registration request] A notch is provided in the guide pin, a guide bushing that fits into the guide pin is mounted at the position of the notch, and a protrusion is provided on the inner wall of the key groove so as to contact the recess of the guide bushing. Features a key guide device for keyboard instruments.