Electrical resistors – Movable contact structure
Patent
1974-12-02
1976-09-21
Albritton, C. L.
Electrical resistors
Movable contact structure
338118, 338128, 338160, 338176, H01C 112
Patent
active
039822214
ABSTRACT:
A contact spring, suitable for use in a variable resistance device having a resistance strip and at least one collector strip adjacent the resistance strip. The contact spring is formed in a unitary construction from a single piece of sheet metal and includes electrically conductive cantilever spring members which depend from a base member and are adapted for sliding electrical contact with the resistance and collector strips. Stiffly flexible, resilient means, preferably in the form of additional cantilever spring members disposed in cruciform relation to the contact spring members, depend from the base member to back up each of the contact spring members by engaging an intermediate portion thereof to retard flexing of the contact spring members toward the base member. The resulting contact spring is quite simple in construction, yet produces a substantially greater contact force with the resistance and collector strips than is achieved by simple cantilever contact spring arms. The effective spring life is accordingly increased because of reduced deterioration during sliding contact with the elements of the resistance device.
REFERENCES:
patent: 3201737 (1965-08-01), Mathison
patent: 3371305 (1968-02-01), Delong et al.
Albritton C. L.
Becker William G.
Bourns Inc.
Koppel Richard S.
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