Thermal cycling switch

Details Thermal cycling switch Thermal cycling switch

1990-08-03

1991-06-04

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337 41, 337 93, H01H 6108, H01H 7116

Patent

active

050217623

ABSTRACT:
A thermal cycling switch has an insulated housing carrying a centrally located rotating cam. The cam operates a first ON/OFF switch connectable between a pair of contacts that are connected to one side of a load and one power line. The rotary cam also moves an adjusted contact mounted on an adjustable arm which cooperates with a cyling arm contact to operate as another switch between the other side of the load and another power line. The cycling arm includes a bimetal member which is electrically insulated at the base, as well as a current conducting strip formed of pure nickel metal extending along the low expansion side of the bimetal member. The metal strip is heated by a separate resistance wire wrapped around an insulated cover on the metal strip and connected across the load so that whenever the load is energized from the power lines, the metal strip is heated to produce an initial biasing force causing the contacts to close in opposition to the thermal expansion of the bimetal, which tends to cause the contacts to open.

REFERENCES:
patent: 2623137 (1952-12-01), Vogelsberg
patent: 3110789 (1963-11-01), Hild et al.
patent: 3634802 (1972-01-01), Aldous
patent: 4337451 (1982-06-01), Fox
patent: 4471338 (1984-09-01), Holtkamp

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