JP2003140641A - Hammer of piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hammer of a piano of a relatively simple structure which is individually and most adequately adjustable in the striking positions of the hammer. SOLUTION: This hammer has a slender hammer shank 2 which has a fitting portion 2a of a non-circular shape in section at its front end, a hammer wood 3 which is formed to a non-circular shape, is fitted with the fitting portion 2a of the hammer shank 2 in an incapable state of rotating and has a mounting hole 3b penetrating the hammer shank 2 in its fitting direction and a slit 6 penetrating the hammer shank 2 in its fitting direction and a screw 7 which is screwed to the hammer wood 3 in the state of penetrating the slit 6 and can tighten the hammer shank 2 across the hammer wood 3.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piano hammer such as a grand piano or an upright piano. 2. Description of the Related Art FIG. 3 shows an example of a conventional grand piano hammer. The hammer 51 has a hammer shank 52 rotatably supported at a front end (not shown) (right end in the drawing) and a hammer wood 53 attached to the tip. Hammerwood 53
It is made of a solid wood material such as mahogany, and its tip is tapered and a hammer felt 54 is adhered. The hammerwood 53 has a circular mounting hole 53c penetrating in the front-rear direction. On the other hand, the hammer shank 52 has a circular cross section, and its tip is fitted into the mounting hole 53c of the hammer wood 53 and fixed by bonding. The hammer 51 having the above-described structure is provided above a rear portion of each keyboard (not shown) via an action (not shown), and pivots upward with a corresponding key depression.
By striking a string (not shown) with a hammer felt 54, a piano sound is generated. The string is stretched in the front-back direction on a soundboard (not shown), and it is necessary to strike a predetermined position in the front-back direction of the string with the hammer 51 in order to obtain a desired tone and volume. Conventionally, the adjustment of the string striking position is performed by moving the hammer 51 in the front-rear direction by moving a hammer 51 and a reed (not shown) on which the action is placed. However, it is inevitable that the hammering position of the hammer varies to some extent between the hammers due to dimensional errors and assembly errors of the components of the action and the hammers. For this reason, it is preferable to adjust the stringing position individually for each hammer. On the contrary,
Conventionally, as described above, since the stringing position is adjusted by moving the reed to move the entire hammer in the front-rear direction, for example, the reed is moved so that the stringing position is optimal for one hammer. Therefore, the hammer cannot be adjusted individually, for example, the string striking position is unfavorable for other hammers. SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and provides a piano hammer with a relatively simple structure that can individually adjust the hammer striking position individually. It is aimed at. In order to achieve this object, a hammer of a piano according to the present invention comprises a slender hammer shank having a fitting portion having a non-circular cross section at the tip end, and a non-circular hammer shank. Formed, the fitting portion of the hammer shank fits in a non-rotatable state, and a mounting hole penetrating in the fitting direction of the hammer shank, a slit extending from the mounting hole and penetrating in the fitting direction of the hammer shank, And a screw that is screwed into the hammer wood while penetrating the slit and that can tighten the hammer shank via the hammer wood. [0007] In this piano hammer, the fitting portion at the tip of the slender hammer shank is fitted into the through hole of the hammer wood. In addition, a slit penetrating in the fitting direction extends from the mounting hole, and a screw is provided on the hammer wood in a state penetrating the slit. With the above configuration, move the hammer wood to an appropriate position in the front-rear direction and tighten the screw,
Since the width of the slit is reduced and the mounting hole is also reduced accordingly, the two can be fixed by tightening the hammer shank via the hammer wood. Therefore, the hammer striking position can be adjusted individually and optimally. Further, since the fitting portion of the hammer shank and the mounting hole of the hammer wood are formed in a non-circular shape and are fitted in a state in which they cannot rotate with each other, even if a shock at the time of striking acts on the hammer shank, the hammer shank is not fitted. In contrast, the rotation of the hammer wood can be reliably prevented. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a hammer of a grand piano to which the present invention is applied. As shown in the figure, the hammer 1 extends in the front-rear direction and is rotatably supported at a front end (right end in the figure) (not shown). It comprises a hammer wood 3 extending in the vertical direction substantially perpendicular to the axis 2 and a hammer felt 4 wound on the upper half thereof. The hammer wood 3 is made of a solid wood material such as mahogany, the upper half of which is tapered, and a tail processed portion 3a is formed at the base end. Hammer felt 4 is the inner under felt 4
a, and an outer top felt 4b, which are sequentially wound around the upper half of the hammer wood 3 and adhered (pressed) in a pressurized state. In the middle part of the hammer wood 3, there is formed a mounting hole 3b having a rectangular cross section and penetrating in the front-rear direction. On the other hand, the hammer shank 2 has a rectangular cross section, and a fitting portion 2a is formed at the tip thereof.
The fitting portion 2a is fitted into the mounting hole 3b of the hammer wood 3 in a non-rotatable state. The hammer wood 3 has a mounting hole 3b.
A slit 6 that penetrates in the front-rear direction is formed above the slit 6. The slit 6 has a lower end continuous with the mounting hole 3 b and extends upward to the vicinity of the hammer felt 4. In addition, a screw 7 is screwed into the hammer wood 3 in a state of penetrating the slit 6. Specifically, a hole having a diameter larger than the threaded portion of the screw 7 and smaller than the shape of the head is formed in advance in a portion of the hammer wood 3 on the front side of the slit 6. The screw is loosely inserted into the portion of the hammer wood 3 behind the slit 6 with a screwdriver 8 or the like. The hammer 1 having the above-described structure is provided above a rear portion of each keyboard (not shown) via an action (not shown). By striking a string (not shown) with a hammer felt 4 and causing it to vibrate, a piano sound is generated. After that, the hammer 1 returns and rotates, and the tail processing portion 3a of the hammer wood 3 is locked by being added to the back check 5 (see FIG. 2). With the above configuration, the width of the slit 6 is reduced by tightening the screw 7 inserted into the hole of the hammer wood 3 with the screwdriver 8, and the mounting hole 3
Since b is also narrow, the hammer shank 2 can be tightened and fixed via the hammer wood 3. Further, for example, when the stringing position of the hammer 1 is shifted forward, the hammer wood 3 is moved to a desired rear position while being inserted into the hammer shank 2, and then the screw 7 is tightened. At that position, the hammer wood 3 can be fixed to the hammer shank 2. Therefore, the hammering position of the hammer 1 can be adjusted individually and optimally. At the time of this adjustment, it is necessary to prevent the fitting portion 2a of the hammer shank 2 from protruding from the hammer wood 3. Otherwise, the joint 2a of the hammer shank 2 hits the back check 5 when the hammer 1 rotates when striking a string. The fitting portion 2a of the hammer shank 2 and the mounting hole 3b of the hammer wood 3 have a rectangular cross section and are fitted in a non-rotatable manner. Even so, the rotation of the hammer wood 3 with respect to the hammer shank 2 can be reliably prevented. The cross section of the fitting portion 2a and the mounting hole 3b can be prevented from rotating as long as the cross section is non-circular. For example, the cross section may be triangular, hexagonal, or elliptical. The present invention is not limited to the embodiments described above, but can be implemented in various modes.
For example, although the embodiment is an example in which the present invention is applied to a hammer of a grand piano, it goes without saying that the present invention can also be applied to a hammer of an upright piano. As described above, the piano hammer of the present invention has a relatively simple structure, and has an effect that the striking position of the hammer can be individually and optimally adjusted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial perspective view showing a hammer of a grand piano according to one embodiment of the present invention. FIG. 2 is a side view showing a hammer and a back check. FIG. 3 is a partial perspective view showing a hammer of a conventional grand piano. [Description of Signs] 1 Hammer 2 Hammer shank 2a Fitting part 3 Hammer wood 3b Mounting hole 6 Slit 7 Screw

Claims (1)

Claims: 1. An elongated hammer shank having a non-circular fitting section at a tip end, and a non-circular shape, wherein the fitting section of the hammer shank is not rotatable. A hammer wood having a mounting hole penetrating in the fitting direction of the hammer shank, and a slit extending from the mounting hole and penetrating in the fitting direction of the hammer shank; A screw that is screwed into the hammerwood in a state, and that can tighten the hammer shank via the hammerwood.