Use of constant force spring in keyboard assembly

Details Use of constant force spring in keyboard assembly Use of constant force spring in keyboard assembly

2009-08-28

2010-10-19

Donels, Jeffrey (Department: 2832)

Music

Instruments

Electrical musical tone generation

C084S174000, C084S423001, C084S433000, C084S423001

Reexamination Certificate

active

07816600

ABSTRACT:
An electronic keyboard that includes a plurality of keys including a first key. The keyboard further includes a key support supporting the first key for movement between a rest position and a depressed position. The keyboard also includes a first key return spring configured to apply a return force to the first key to bias the first key toward the rest position. In the keyboard, the first key return spring is configured such that the return force has a substantially constant magnitude throughout the movement of the first key between the rest position and the depressed position.

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Small Parts, Inc. ‘Spring, Constant Force-Stainless Steel Type 301’, Jun. 8, 2004, http://web.archive.org/web/20040608192322/http://www.smallparts.com/products/descriptions/cfs.cfm.
Yamaha Advanced Sound Technology, http://music.yamaha.com/products/highlights/keyboardsAST/8.html, pp. 1-3.

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