Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With bimetallic element
Patent
1978-12-21
1980-09-23
Beha, Jr., William H.
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With bimetallic element
337347, H01H 3760
Patent
active
042245931
ABSTRACT:
A two-bimetal thermostat provides double motion for enhanced contact actuation and minimum differential. Two bimetal plates are pivotally supported at one end to extend generally parallel. The other, deflectable ends of these bimetal plates, one of which is shorter than the other, have right-angle bends and are biased by a compression C-spring for overcenter snap-action. These deflectable ends are coupled by drive pins to respective contacts of a spring-biased contact pair to be free of the bimetal plates when closed and are actuated thereby to open condition. Differential adjustment is accomplished by adjusting one bimetal plate longitudinally to vary the C-spring load thereby to correspondingly vary the temperature differential between contact closure and opening. Range adjustment is attained by turning a knob which acts through a cam on the pivotal mounts to vary the angle between the bimetal plates thereby to require more or less bimetal bending for contact actuation.
REFERENCES:
patent: 2195304 (1940-03-01), Hathaway
patent: 2383414 (1945-08-01), Osterheld
patent: 2440025 (1948-04-01), Singleton
patent: 2599473 (1952-06-01), Miller
patent: 2758176 (1956-08-01), Harrold
patent: 2873329 (1959-02-01), Swenson
patent: 2930874 (1960-03-01), Andrews
patent: 3184571 (1965-05-01), Broekhuysen
patent: 3236977 (1966-02-01), Huffman
patent: 3378660 (1968-04-01), Dales
patent: 3471819 (1969-10-01), Gianola et al.
patent: 3891957 (1975-06-01), Holtkamp
Autio Wm. A.
Beha Jr. William H.
Eaton Corporation
Rather Hugh R.
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