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Publication numberUS135820 A
Publication typeGrant
Publication dateFeb 11, 1873
Publication numberUS 135820 A, US 135820A, US-A-135820, US135820 A, US135820A
InventorsLeopold Ktfhstkr
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improvement in piano actions
US 135820 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)


Piano Actia n's.v

NO.135,82O. Patented Feb. 11,1873.


LEUvlOLl) Kl JHNltl-t, OF NEW' YOPK, N. X.


pecification forming part of Letters Patent No. 135,820, dated February 11, 18723.

To all whom it may concern:

Be it known that I, LEOPOLD KUHNER, of the city, county, and State of New York, have invented a new and useful Improvement in Piano-Forte Actions; and I do hereby declare the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reierencebeinghad to the accompanying drawing forming part of this specification, which drawing represents a side view of my invention.

This invention relates particularly to an improvement in the action of upright piano-fortes; and it consists in the arrangement of a counterweight on the hammer, said weight serving to act, in conjunction with the hammer-check and the incline on the shank of the key, in such a manner that by said weight the hammer is caused to fallback even if the strin frame is placed in a vertical position, and that by placing the string-frame in a vertical position the depth of the piano-forte can be reduced, and the instrument requires a comparatively small space without losing in its other qualities.

In the drawing, the letter A. designates the key of a piano-torte, and on this key is secured the jack B, which engages with the butt-end of the hammer C in the usual manner. On the support of the jack I have also secured the hammer'check D, which acts in conjunction with a counter-weight, E, fastened to an arm that extends from the shank of the ham men The hammer O swings on a pivot, a, which is secured in an arm extending from the hammer-rail F, and the inner end of the key acts on the horizontal arm. ot'a bellcrank lever, G, the vertical arm of which stands opposite to the lower end of the damper-lever H. A spring, Z), has a tendency to retain the damper in contact with the string 5, hen the key is touched the damper is forced back from the string, and at the same time, by the action of the jack B, the hammeris caused to strike the string and to produce the desired tone, By the counterweight E the hammer l is compelled to fall back from the string immediately on being released by the jack, and as said weight catches over the check D it prevents the hammer from rebounding.

Both the jack B and the hammer-check D are fastened to the shank of the key, and this shank is provided with an incline, F, whereby the correct position of said parts in regard to the butt of the hammer and to the counter weight is insured.

By this arrangement I am enabled to place the string-frame in a vertical position, and the hammers will always fall back after they have struck the strings, whereas in upright piano fortes with actions of any of the ordinary constructions the string-frame has to be placed in an inclined position, so as to prevent the hammer from resting against the strings and if the string-frame has to be placed in an inclined position, the width of the case has to be increased in proportion, while by my invention I am enabled to reduce the depth of the case; and consequently one of my upright pianofortes requires less room than those in which the string-frame has to be placed in an inclined position.

My action is very simple in its construction, not liable to get out of order, and easily adjusted in all its parts, so that the same can be furnished without increasing the cost of the instrument; and in fact by reducing the width of the case I save in labor, and I can furnish my piano-fortes at a reduced price without loss to me.

\Vhat I claim as new, and desire to secure by Letters Patent, is-- The shank of the key A, formed with the incline F and supporting the jack B, and the check D, in combination with the counterweight E, and hammer 0, all constructed and arranged in respect to each other as herein shown and described.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2455139 *Jul 18, 1946Nov 30, 1948Prevost Auxance NPiano mechanism
US4879939 *Mar 22, 1988Nov 14, 1989Wall Paul GAction for upright piano
Cooperative ClassificationG10C3/163