JPH0224155Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the hammershank in an upright piano action, and aims to shorten the contact time with the strings to obtain a clear musical tone similar to that of a grand piano.

Figure 1 is a side view of the main parts of the upright piano action.
As the jack pushes up the butt and rotates the butt, the hammer shank 1, which has a circular cross section and is installed in the butt, rotates counterclockwise as shown in the figure, and the tip of the hammer wood at the upper end of the hammer shank 1 is rotated. A hammer (felt) 3 attached to the drum strikes the strings 4 to produce a musical tone.

The hammer speed of an upright piano action is about 60% of that of a grand piano action, so the contact time of the hammer 3 with the string 4 is longer, especially in the treble part, which is similar to that of a grand piano. It was difficult to obtain a clear, crisp musical tone.

This idea was made in view of the above-mentioned points, and in particular, in order to shorten the contact time of the hammer 3 with the string 4, the cross-sectional shape of the hammer shank 1 on the treble side is made into a substantially triangular shape. one top 1 of
a is located on the string 4 side on the string-striking motion line P, and the other two apexes 1b and 1c are located on a right-angled line Q that is perpendicular to the string-striking motion line P, respectively. do.

An embodiment of this invention will be described below with reference to the drawings. FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and the hammershank 1 of this invention has a substantially triangular cross-sectional shape, and as shown in an enlarged view of the hammershank 1 in FIG. This one peak 1a is located on the string-striking motion line P toward the string 4 and on the string 4 side, and the other two peaks 1b and 1c
is located on a perpendicular line Q that is perpendicular to this string-striking motion line P. In addition, in Figure 3,
The dotted line indicates a conventional circular hammershank, and the hammershank 1 according to this invention has a cross-sectional shape obtained by cutting off the rear part (right side in the figure) and diagonally left and right front parts of the conventional circular hammershank.

FIG. 4 shows another embodiment of the hammer shank 1, which has a cross-sectional shape in which only the left and right oblique front parts are cut away.

As described above, according to this invention, the cross-sectional shape of the hammer shank is approximately triangular, with one top facing the string side and the other two tops positioned at the rear, so that when the string is struck, the hammer shank The deflection of the shank is small, so the contact time with the strings is shortened, and if this is applied to the high-pitched hammer shank, it is possible to obtain a clear musical tone similar to that of a grand piano.

[Brief explanation of the drawing]

Figure 1 is a side view of the main parts of an upright piano action, Figure 2 is an upright piano action using a hammer shank according to this invention, and is a sectional view taken along line A-A in Figure 1. Figure 3 and FIG. 4 are cross-sectional views of an embodiment of the hammershank used in this invention. 1...Hammershank, 1a, 1b, 1c...
…Top, 3…Hammer, 4…String, P…String motion line, Q…Right angle line.

Claims (1)

[Scope of utility model registration request] The treble-side hammershank 1 has a substantially triangular cross-sectional shape, and one apex 1a of the substantially triangular shape is located on the string 4 side on the string-striking motion line P, and the other two apexes 1b and 1c are respectively An upright piano action characterized in that the upright piano action is positioned on a perpendicular line Q that is perpendicular to the string-striking motion line P.