Title: Electric switch utilizing coil spring torsion biasing in switch operation

Abstract: A miniaturized electric switch particularly suitable for electronic keyboard control applications includes at least one coil spring having a laterally extending coil spring end contact where spring compression biases the switch toward an unoperated condition and spring torsion urges the end contact relative to a second contact and a switch housing mounted cam engages the coil spring end contact incident operation of the switch between operated and unoperated conditions to urge the end contact relative to the second contact.

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Inventors: Twyford, Robert H. (Springfield, VA, US)

Application Number: 958829
Filing Date: 1978-11-08
Publication_date: 1980-05-13
Assignee: Mechanical Enterprises, Incorporated (Sterling, VA)
Primary Class(es): 200/276.1 200/276, 200/535
Other Classes:
US Patent Ref:

3767878	Oct, 1973	Sykora	200/276.
3860776	Jan, 1975	Lockard	200/276.
3920943	Nov, 1975	Lapointe	200/159.
3949181	Apr, 1976	Kempf	200/159.

Other Refs:
Primary Examiner: Pollard, Steven M.
Assistant Examiner:
Attorney: Schuyler, Birch, McKie & Beckett