Thermal mechanism with ambient compensating bimetal providing tr

Details Thermal mechanism with ambient compensating bimetal providing tr Thermal mechanism with ambient compensating bimetal providing tr

1982-09-29

1984-12-04

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337 99, 337378, H01H 7116

Patent

active

044867336

ABSTRACT:
An electrothermal responsive protective mechanism for an electrically powered load wherein the overload tripping force is provided by the cool, ambient temperature compensating bimetal (12) rather than the hot electrically heated bimetal (6) to prevent over-stress. The bimetal members (6,12) are preloaded by a link actuator (22) having a positive temperature coefficient of expansion to minimize unloading of the bimetal members due to ambient temperature change thereby to prevent tripping motion. A screw (16) adjusts the preload and a screw (24) provides a coupling gap in the tripping linkage to prevent shock or vibration propagation therethrough. An insulating base (2) and carrier (14) provide thermal and electrical isolation of the bimetal members. Identical bimetal members (6,12) are used to prevent any actuator motion under ambient temperature changes.

REFERENCES:
patent: 1513210 (1924-10-01), Banan
patent: 2284383 (1942-05-01), Elmer
patent: 2446831 (1948-08-01), Hattenroth, Jr.
patent: 3183328 (1965-05-01), Wheeler
patent: 3257526 (1966-06-01), Ramsey et al.
patent: 3701962 (1972-10-01), Ball et al.
patent: 3825868 (1974-07-01), Jess et al.

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