JPS599250Y2 - 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 1B, a conventional key guide device for a keyboard instrument has a guide bush 2 made of rubber or the like attached to the bent part of a guide piece 1 fixed to a chassis, and this guide bush 2 guides the key. It fits into the lower groove of No.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. Therefore, 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 fitted onto the guide piece 1 so that the protrusions 4 come into contact with the inner wall of the lower groove of the key 3.

(Fig. 2B) In this case, the key 3 is guided by the protrusion 4 of the guide bush 2 which is easy to bend, so compared to the one in Fig. 1, the left and right play of the key during key operation is avoided without increasing contact friction. However, since the guide bush 2 has directionality and when installed as shown in FIG.
It has the disadvantage that it takes a lot of effort to attach it to the body.

The present invention aims to eliminate the drawbacks of conventional key guide devices, and a guide bush 2 made of rubber or the like is attached to the bent horizontal part of a guide piece 1 fixed to a chassis, and the guide bush 2 is attached to a key 3. In the one that fits into the lower groove part, the guide push 2 is provided on both sides of the bent horizontal part of the guide piece 1.
It is characterized in that a shorter notch 5 is provided and the guide push 2 is attached to the guide piece 1 so as to cover the notch 5.

3A, B, C, and D show a key guide device according to an embodiment of the present invention.

A U-shaped notch 5 shorter than the guide bushing 2 is provided at the bent portion of the guide piece 1, and a cylindrical guide bushing 2 made of rubber or the like is fitted into the guide piece 1 so as to cover the notch 5. , the guide bush 2 is deformed to form a central recess according to the shape of the guide piece 1.

When this guide bush 2 is fitted into the lower groove of the key 3, only the end of the guide bush 2 comes into contact with the inner wall of the key, so that the contact friction is reduced.

The notch 5 of the guide piece 1 may be V-shaped instead of U-shaped.
Other shapes can also 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 installing the guide bush on the guide piece, so workability is good. Since it is attached to the cut arrow part of the guide piece, it has the advantage that it will not shift.

[Brief explanation of the drawing]

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. Figures 2B and 2C are cross-sectional views, Figure 3 shows an embodiment of the present invention, Figure 3A is a perspective view with the key removed, Figure 3B is a plan view, and Figure 3C is a cross-sectional view. The side view, FIG. 3D, is a sectional view. 1... Guide piece, 2... Guide push, 3...
Key, 5... Kiriyabe.

Claims (1)

[Scope of utility model registration request] A guide bushing 2 made of rubber or the like is attached to the bent horizontal portion of the guide piece 1 fixed to the chassis, and the guide bushing 2 is inserted into the lower groove of the key 3. A key guide device for a keyboard instrument, characterized in that a notch portion 5 shorter than the guide pusher 2 is provided on both sides, and the guide pusher 2 is attached to the guide piece 1 so as to cover the notch portion 5.