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Publication numberUS269405 A
Publication typeGrant
Publication dateDec 19, 1882
Filing dateAug 12, 1882
Publication numberUS 269405 A, US 269405A, US-A-269405, US269405 A, US269405A
InventorsAlbert Gemttnder
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 269405 A
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Description  (OCR text may contain errors)

(No Model.)



No. 269,405. Patented Dec. 19, 1882.





SPECIFICATION forming part of Letters Patent No. 269,405, dated December 19, 1882, Application filed August 12, 1882. (No model.)

To all whom it may concern:

Be it known that I, ALBERT GEMtiNDER, a citizen of the United States, and a resident of Columbus, in the county ofFranklin and State of Ohio, have invented a new and valuable Improvement in Piano-Actions; and I do hereby declare that the following is a full, clear, and exact description of the construction andoperation of the same, reference being had to the annexed drawings, making a part of this specification, and to. the letters and figures of reference marked thereon.

Figure 1 is a partial vertical longitudinal sectional view. Fig. 2 is a detached perspective view ofthe pivoted lever, jack, spring, and their adjuncts; and Figs. 3 and 4 are detail views.

This invention relates to an improvement in piano-actions, and has for its object to reduce friction and simplify the construction of the action, and also obtain a high degree of elasticity, and to render the action compact and durable.

Referring by letter to the drawings, in which a piano-action constructed in accordance with my invention is illustrated, A indicates the key, which is pivoted in a recessed block, B, by means of a pivot, O, journaled in the said block, and provided with a vertically-projecting pin, 0, which passes up through the key. The upper end of this pin is screw-threaded, and a nut, D, and some suitable washer fitted thereon, whereby the key can be detached by first removing the said not and washer.

E indicates the jack, which is pivoted in the free bifurcated end of a pivoted lever, F. The lower arm of this jack is forked and embraces a pin, Gr, attached to the key-lever. A nut, g, and a suitable washer are fitted upon this pin above the forked arm of the jack, and by ad justing said nut the height of the jack can be regulated.

l ried by means of a rod, K, pivoted at one end, I and at its opposite screw-threaded end provided with a suitable nut.

In order to lessen friction, I provide either the jack or the under side of the arm of the hammer L with a roller, M, in the present instance the said roller being carried by the hammer-arm or handle and the jack acting against the roller.

0 indicates a movable back check for the hammer. This back check is sustained by a rod secured to a plate, P, which is slotted and fitted upon the key, and a set-screw passes through the slot of said plate, whereby it can be adjustably secured upon the key, and thereby regulate the position of the back check with relation to the hammer.

e Having thus described my invention, whatI claim is- 1. In a piano-aetion, the combination, with the key-lever A, provided with the vertical threaded pin 0, having nut and washer, of the bifurcated bearing B and the removable pivot O, substantially as specified.

2. Inapiano-action,thecombination,with the pivoted lever F, bifurcated at its free end, and the pivotedjack E in the forked end thereof, of the spring I, slotted arm i, the ham mer-arm L, roller M, and pivoted rod K, substantially as specified.

3. The lifter H, adjustably connected with a lever carrying the jack, and having a roller resting upon the key, substantially as specified.

4. In a piano-action, the combination ofthe pivoted key-lever A,,the pivoted bifurcated lever F, the jack E, the lifter H, spring I, and slotted arm 2', rod K, pin G, hammer L, and friction-rollers M and h, constructed and operating substantially as specified.

5. The combination, with the pivoted lever F, of the spring 1, the slotted bar 2', and the jack passing through said bar, which is secured to one end of the spring, substantially as described. 7

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses. I



Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2466498 *Jan 10, 1947Apr 5, 1949Smith Charles FPiano action
US2540871 *Aug 1, 1944Feb 6, 1951Finholm William SPiano action
US4856402 *Jan 6, 1989Aug 15, 1989Alexander James RGrand piano actions
US7129403 *Jun 29, 2004Oct 31, 2006Richard WroblewskiFriction at the jack and knuckle interface in a grand piano eliminated
US7807907 *Nov 21, 2008Oct 5, 2010Yamaha CorporationKeyboard musical instrument and action unit incorporated therein
CN101483037BJan 8, 2009Jan 2, 2013雅马哈株式会社Keyboard musical instrument and action unit incorp.orated therein
WO2010065089A1 *Nov 30, 2009Jun 10, 2010David StanwoodMovable pivot bearing for changing key leverage in string keyboard instruments
Cooperative ClassificationG10C3/22