ACTION OF GRAND PIANO
First Claim
1. An action of a grand piano, which operates in accordance with depression of a key to thereby cause pivotal motion of a hammer, including:
- a wippen formed by a molded article of a synthetic resin and configured to pivotally move upward by being pushed up by the key subjected to key depression;
a jack pivotally mounted to the wippen and configured to push up the hammer in accordance with pivotal motion of the wippen to cause the hammer to pivotally move upward; and
a jack angular position-adjusting mechanism provided on the wippen so as to adjust an angular position of the jack,wherein the jack angular position-adjusting mechanism comprises;
a support portion integrally formed with the wippen;
an adjustment screw extending a predetermined length in a front-rear direction and screwed into the support portion such that the adjustment screw is movable forward and backward in the front-rear direction; and
an abutment portion provided on a jack-side end of the adjustment screw, for defining the angular position of the jack by abutment with the jack.
1 Assignment
0 Petitions
Accused Products
Abstract
An action of a grand piano, which makes it possible to reduce not only the weight of a jack, but also that of a wippen, to thereby improve string striking repeatability. The action includes a wippen of a synthetic resin configured to pivotally move upward by being pushed up by the depressed key, a jack pivotally mounted to the wippen, for pushing up the hammer in accordance with pivotal motion of the wippen to cause the hammer to pivotally move upward, and a jack angular position-adjusting mechanism provided on the wippen to adjust an angular position of the jack. The mechanism has a support portion integrally formed with the wippen, an adjustment screw screwed into the support portion movably in a front-rear direction, and a jack button provided on an end of the adjustment screw for defining the angular position of the jack by abutment therewith.
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Citations
4 Claims
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1. An action of a grand piano, which operates in accordance with depression of a key to thereby cause pivotal motion of a hammer, including:
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a wippen formed by a molded article of a synthetic resin and configured to pivotally move upward by being pushed up by the key subjected to key depression; a jack pivotally mounted to the wippen and configured to push up the hammer in accordance with pivotal motion of the wippen to cause the hammer to pivotally move upward; and a jack angular position-adjusting mechanism provided on the wippen so as to adjust an angular position of the jack, wherein the jack angular position-adjusting mechanism comprises; a support portion integrally formed with the wippen; an adjustment screw extending a predetermined length in a front-rear direction and screwed into the support portion such that the adjustment screw is movable forward and backward in the front-rear direction; and an abutment portion provided on a jack-side end of the adjustment screw, for defining the angular position of the jack by abutment with the jack. - View Dependent Claims (2, 3, 4)
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Specification