Differential temperature control

Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – Expansible or vaporizable fluid actuated

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Details

200 83D, 337321, H01H 3736

Patent

active

044918216

ABSTRACT:
A differential temperature control uses a first temperature expansion element for driving a first pivoted lever supporting a selectively operable switch and a second temperature expansion element for driving a second pivoted lever for operating the switch. The position of the switch operating lever with respect to the switch is achieved by either the first or second temperature expansion element which move the first lever and the second lever, respectively, in direct proportion to a change in the corresponding sensed temperatures. In the case of a movement produced by the temperature expansion element controlling the position of the switch, a similar temperature change sensed by the second temperature element would be needed to "chase" the switch to restore a switch actuation relationship to produce a differential temperature control. A selective adjustment of the spacing of the second lever with respect to the switch is used to change the differential temperature that will produce a switch actuation.

REFERENCES:
patent: 343691 (1886-06-01), Baulieu
patent: 2067959 (1937-01-01), Wasson
patent: 2226297 (1940-12-01), Spangenberg
patent: 2404596 (1946-07-01), Roche, Jr.
patent: 2536831 (1951-01-01), Allan
patent: 3139501 (1964-06-01), Cook
patent: 3358605 (1967-12-01), Ayers

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