JPS5853584Y2 - Piano keyboard receptacle support device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a support device that prevents the keyboard receptacle from warping in a piano and allows smooth lateral movement for tone adjustment.

Figure 1A schematically shows the internal structure of a grand piano, where a keyboard receptacle b arranged on a shelf a supports a large number of keys and an action mechanism C integrally thereon. However, it is possible to make adjustments to the action mechanism C, and to enable slight lateral movement by operating the soft pedal P to reduce the volume as shown in the figure. is placed on shelf a without being fixed in any way,
Normally, the rear edge is simply held in place by the keyboard grip d, and the pins e on both sides of the front end are guided by guides inside the clapper f (see Figure 3).

Therefore, the keyboard receptacle, especially the front receptacle, tends to warp or twist due to aging, which can cause problems such as the action mechanism C not being adjusted properly or the receptacle not moving smoothly laterally. It happens often.

This idea was made to improve the above-mentioned drawbacks.The front part of the keyboard receptacle is restrained by a piece whose lower surface is formed into an arc shape, which prevents warping and twisting and also smoothes the horizontal movement of the reed. To provide a support device for a keyboard receptacle.

Figures 2 and 3 show examples of this invention.
Reference numeral 1 denotes a keyboard receptacle, and the front and rear recesses 1a and 1b form crosspieces at the front and rear (the right side is the front, the left side is the rear), the middle 1C serves as a balance fulcrum for the keyboard at the center, and the end boards on both sides. 1d, and a plurality of middle keys 1e arranged at predetermined intervals between them to form a horizontally elongated lattice shape. Pins e (only one side is shown in the figure) provided on both sides of the front 1a are guided by guides on the inside of the clapboard f.

A step part 2 is formed on the upper edge of the front end of the front receptacle 1a, and a step part 2 is formed with a rectangular side surface cut out along the elongated direction. On the inner surface of the mouth frame 3 attached above, a plurality of stoppers 4 made of an elastic material such as wood, rubber, or synthetic resin and having an arcuate lower surface are arranged eccentrically at the upper part at required intervals. The arched lower surface of each locking piece 4 is in contact with the horizontal surface of the stepped portion 2 at the front end of the receptacle 1a.

When assembling the keyboard receptacle 1, a lubricant such as graphite is applied to the lower surface of the front resonator 1a and the rear recess 1b and the stepped portion 2.

In FIG. 3, reference numeral 5 supports the front end of the keyboard with a front pin implanted on the reed.

As described above, in this invention, a step is formed along the longitudinal direction on the upper edge of the front end of the keyboard receptacle, and a plurality of pieces rotatably attached to the inner surface of the mouth frame are attached to this step. Since the arcuate lower surface of the presser foot is in contact with the presser foot, warping and twisting at the front of the keyboard is effectively prevented, and the action mechanism is less likely to go awry.Also, the presser foot has an arcuate lower surface and is rotatable. Therefore, there is little resistance when moving the keyboard, and horizontal movement for volume adjustment can be performed smoothly.

[Brief explanation of the drawing]

FIG. 1A is a partial sectional view schematically showing the internal state of the grand piano. Figure 1 is a front view of the keyboard receptacle moving mechanism. FIG. 2 is a perspective view of an embodiment of this invention. FIG. 3 is a sectional view taken along line XX in FIG. 2. In the diagram, 1 is the keyboard facing down, 1 a is the front of the keyboard, 1b is the back of the keyboard, 1
c is the middle part, 1d is the gable board, lc is the middle part, 2 is the stepped part,
3 is the mouth frame, 4 is the presser piece.

Claims (1)

[Scope of utility model registration request] The above-mentioned keyboard receptacle 1 is formed in a lattice shape by the front part 1a, the rear part 1b, the middle part 1C, the end plates 1d on both sides, and the plurality of middle parts 1e, and whose rear edge is restrained by the keyboard grip d. A stepped portion 2 is formed along the longitudinal direction on the front end of the keyboard receptacle 1a, and a stepped portion 2 of wood, rubber, synthetic resin, etc. is formed at a required interval on the inner surface of the mouth frame 3 disposed on the front side of the keyboard receptacle 1. A plurality of presser pieces 4 made of an elastic material and each having an arcuate lower surface are rotatably mounted, and the arcuate lower surfaces of the presser pieces 4 are connected to the stepped portion 2.
A support device for the keyboard recess of a piano, which is brought into contact with the keyboard.