JPH02792Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a key support device for a keyboard instrument such as a piano.

Traditionally, key support devices for musical instruments with an action mechanism, such as pianos, have been compared with key support stands (reeds) made of hard wood such as maple or beech with balance pins made of brass or iron, and those made of wood such as spruce or bar wood. The key consists of a key made of wood with low density and strong rigidity, and a vertical hole is bored in the center of the key in the front and back direction, and the balance pin is passed through this hole. It is supported so that it can swing back and forth using the key support stand as a fulcrum. For this reason, keys and key supports are easily affected by temperature and humidity, and there is an urgent need to make them metal or synthetic resin, which satisfies both the functional aspects of accuracy and strength as well as the cost aspects of processing costs and material costs. I couldn't do anything.

This idea was made in view of the above points, and it provides a key support device for musical instruments that uses metals such as iron and aluminum and synthetic resin as materials, and has a sufficient combination of functionality and cost. It is something.

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a key support member having a concave cross section and having flat surfaces on both sides, and is also a part of a shelf member horizontally installed in the direction in which the keys 4 are arranged. A guide member 2 having a concave side surface is fixed to the upper surface of the key support member 1. The guide member 2 is composed of a bottom plate 2c, a base 2a standing upright at the front and rear ends of the bottom plate 2c, and a plurality of comb-shaped protrusions 2b provided on the top of the base 2a. This is an example of a piano, in which the front protrusion 2b is for white keys, and the rear protrusion 2b is for black keys.

A guide bush 3 made of synthetic resin shown in FIG. The guide bush 3 is composed of a cylindrical main body 3a and a protrusion 3b projecting laterally from the lower part of the left and right sides of the main body 3a, and a key swing apex 3e is provided at the upper end of the protrusion 3b. A downwardly open groove 3d is provided through the cylindrical main body 3a and across both the left and right protrusions 3b. Further, the cylindrical main body 3a is provided with an insertion hole 3c in which the protruding piece 2b of the guide member 2 is inserted in the direction of its vertical central axis.

Now, as shown in FIG. 3, in this guide bush 3, the projection 2b of the guide member 2 is inserted into the insertion hole 3c, and the upper part of the base 2a of the guide member 2 is inserted into the groove 3d. and mounted on the guide member 2. That is, the protruding piece 2b is inserted through the guide bush 3, and is attached to the lower part of the protruding piece 2b so as to sandwich the base 2a.

On the other hand, the swinging part of the key 4, as shown in FIG.
It is made of metal with a concave cross section, and a notch 4c with an inverted V-shaped side surface is provided from the bottom plate 4a to the left and right side plates 4b, 4b. Therefore, the side plate 4
There is an inverted V-shaped apex 4 in the notch 4c of b, 4b.
d is formed.

FIG. 5 is a front view of a state in which a guide bush 3 is attached to the guide member 2 and a key 4 is mounted on the guide bush 3, and FIG. 6 is a side view of the same state. As is clear from these two drawings, the apex 4d of the key 4 is placed in contact with the key swing apex 3e at the upper end of the protrusion 3b of the guide bush 3, and the cylindrical body 3a of the guide bush 3 is placed on the side plate of the key 4. 4
The guide bush 3 safely holds the key 4 by contacting the inner walls of the keys 4b and 4b.

As described above, this invention has a simple structure, but the key swings extremely smoothly.
Also, the stability of the key is very good.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the guide member fixed to the key support member, Fig. 2A is a perspective view of an embodiment of the guide bushing, B is a side view thereof, and C is its plane. Fig. 3 is a front view of the guide bushing attached to the guide member, Fig. 4 is a perspective view of the swinging member of the key, and Fig. 5 is an implementation of this invented device. A front view of the example, and FIG. 6 is a side view thereof. 1...Key support member, 2...Guide member, 2a
...Base, 2b...Protrusion, 3...Guide bush, 3a...Cylindrical body, 3b...Protrusion, 3e...
...key swing apex, 4...key, 4a...bottom plate, 4b...
...Side plate, 4c...notch, 4d...apex part.

Claims (1)

[Scope of utility model registration request] A long guide member 2 having a plurality of comb-shaped protrusions 2b provided on the upper part of the base 2a is fixed to the key support base member 1, and the protrusions 2b have protrusions 3b extending laterally at the bottom of both sides thereof. A cylindrical guide bush 3 having a cylindrical guide bush 3 is inserted so as to sandwich the base 2a, and a notch 4c with an inverted V-shaped side surface is provided from the bottom plate 4a of the key 4 having a concave cross section to the left and right sides 4b, and the key 4 is The key is inserted into the cylindrical main body 3a of the guide bush 3 through the notch 4c, and the top part 4d of the inverted V-shape of the side plate 4b in the notch 4c of the key 4 is the key swinging peak of the upper end of the protrusion 3b of the guide bush 3. 3e, and the cylindrical main body 3a of the guide bush 3 is brought into contact with the inner wall of the side plate 4b of the key 4.