Title: Humidity and temperature responsive switch

Abstract: A humidity-biased temperature responsive switch for controlling an automobile air conditioning compressor which closes at a warmer ambient temperature when the humidity is low than when the humidity is greater. The switch includes a sensor element having a metal strip and a hygroscopic plastic strip laminated together so that the different thermal coefficients of expansion will cause the free end of a cantilever-mounted sensor to move a contact. Absorption of water from the ambient air causes the plastic to swell and elongate and resultantly moves the contact into a closed position at a lower temperature than when the humidity is low.

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Inventors: Armstrong, William A. (Grosse Ile, MI, US)

Application Number: 522474
Filing Date: 1974-11-11
Publication_date: 1976-02-03
Assignee: General Motors Corporation (Detroit, MI)
Primary Class(es): 337/300 200/61.06
Other Classes:
US Patent Ref:

2267164	Dec, 1941	Newton	337/300.
2756295	Jul, 1956	Schluchter	200/61.
3336119	Aug, 1967	Alban et al.	337/300.

Other Refs:
Primary Examiner: Broome, Harold
Assistant Examiner:
Attorney: MacLean, Jr.; K. H.