JPH02787Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a support structure for the center rail of an upright piano.

The support structure of the center rail of a conventional upright piano consists of a center rail 1 on which a plurality of various flanges (not shown) are attached, as shown in Fig. 1.
are connected and supported on the back surfaces of the bus bracket 2, middle bracket 3, and cam bracket 4, and although not shown in the figures, a plurality of dampers, hammers, wits pens, etc., are pivotally mounted on the various flanges.
When the key is operated, a responsive action hammer strikes the strings stretched between the frame and the bridge, producing a piano sound. The upper ends of the brackets 2, 3, and 4 are secured to a frame (not shown) by frame bolts 5, and the lower ends are placed on an action base 6 via bolts 7, and 6 is arranged on a shelf board (not shown). Note that 8 in the figure is a hammer rail.

In the support structure of the center rail of such an upright piano, brackets 2, 3,
4, align the center rail 1 and the entire axis attached to the action base 6 with the strings.
Since the position of the string is determined, it is difficult to accurately position the string, and in order to find the best string-striking point, adjustment of brackets 2, 3, and 4 and the action base on which each bracket is placed is required. It required a large amount of installation man-hours and skill. With this center rail support structure, middle bracket 3
is provided to prevent bending or warping in the center of the center rail where the axle is attached.
For this reason, brackets with the same shape as the left and right brackets are used, but if the center rail 1 has sufficient strength, the center part of the center rail 1 will not bend or bend due to the weight of the axle. Therefore, it can be supported only by the bus bracket 2 and the cam bracket 4, and the middle bracket 3 is unnecessary. However, in reality, if you want to obtain sufficient strength for a long center rail, it is necessary to use high-strength material. Another drawback is that increasing the plate thickness increases manufacturing costs.

This idea was made in view of the above-mentioned drawbacks, and the center rail, on which a plurality of dampers, hammers, levers, etc. The upper ends of the brackets 2 and 4 are fixed to the frame by frame bolts 5, and the lower ends of the brackets 2 and 4 are placed on the action base 6 via the action base bolts 7. Furthermore, the structure is such that the center of the center rail 1 is supported by a metal fitting whose one end is connected to the substantially central lower part of the center rail 1 and the other end is fastened to the shelf board with screws, etc., and the installation is easy. To provide a center rail support structure for an upright piano in which a center rail 1 and brackets 2 and 4 equipped with an action can be easily installed in the piano body.

Hereinafter, the center rail support structure for an upright piano according to this invention will be explained in detail with reference to the drawings of the embodiments.

Fig. 2 is a schematic perspective view for explaining one embodiment of the center rail support structure of an upright piano according to this invention, and in the figure, the same reference numerals as in Fig. 1 have the same effect as explained in the same figure. In this embodiment, both ends of the center rail 1 are supported by brackets 2 and 4, the upper ends of these brackets 2 and 4 are connected and locked to the frame by frame bolts 5, and the lower ends are connected to the frame via action base bolts 7. In addition to being configured to be placed on the action base 6, an L-shaped metal fitting 9 is connected and attached approximately at the center of the center rail 1 with a screw 10, and this
The shaped metal fittings 9 are connected to the shelf board by screws 11.

FIG. 3 is a schematic perspective view of the main part of the embodiment of this invention shown in FIG. Fit the screw 10 of the L-shaped metal fitting 9, and tighten and connect with the nut 10a. Thereafter, this L-shaped metal fitting 9 is screwed and connected to a shelf board (not shown) through the lower mounting hole 11.

FIG. 4 is a schematic perspective view of a main part of another embodiment of this invention, and in the figure, an L-shaped fitting 9 with a nut 10a attached is screwed into the mounting hole 1a at the approximate center of the center rail 1. Then, the screws are screwed onto the shelf board through the mounting holes 11. In the figure, 12 is a hammer flange, and 13 is a damper flange.

As described above, according to the center rail support structure of the upright piano of this invention, the center rail equipped with an action is supported at both ends by the left and right brackets, and at the center from the front by an L-shaped metal fitting. Because it is supported, it can be easily installed inside the piano body with a simple installation process, and the number of conventional brackets, action bolts, action bases, and action base bolts can be reduced by one. It is effective in reducing the number of points and improving installation and adjustment work, and is useful when applied to upright pianos.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view for explaining a conventional center rail support structure for an upright piano, and Fig. 2 is a schematic perspective view for explaining an embodiment of the center rail support structure for an upright piano according to this invention. , Fig. 3 is a schematic perspective view of the main part of the embodiment of this invention shown in Fig. 2, and Fig. 4 is a schematic perspective view of the main part for explaining another embodiment of the center rail support structure for an upright piano according to this invention. It is a diagram. In the figure, 1...center rail, 2...bus bracket, 3...middle bracket, 4...cambracket, 5...frame bolt, 6...action base, 7...action base bolt,
8...Hammer rail, 9...L-shaped metal fitting, 10
... screw, 11 ... screw mounting hole, 12 ... hammer flange, 13 ... damper flange.

Claims (1)

[Scope of utility model registration request] In a center rail support structure in which the center rail is supported on an action bracket whose upper end is locked by a frame bolt implanted in the frame and whose lower end is placed on an action base bolt implanted in the action base. An upright characterized in that the center rail is supported by a through hole provided in the approximate center thereof, and an L-shaped metal fitting having one end connected to the through hole and the other end attached to a shelf board. Piano center rail support structure.