Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With bimetallic element
Patent
1983-09-09
1986-01-07
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With bimetallic element
337370, H01H 3712, H01H 3752
Patent
active
045636672
ABSTRACT:
For stopping drift or other undesired changes in the response temperatures of a thermal switch using a bimetallic element for driving a moving contact, the design is such that the moving contact and a counter-contact are supported on a common insulating supporting part and the counter-contact is elastically and yieldingly fixed on the supporting part. The lengths of the bimetallic element and of the a strip supporting the counter-contact that may be moved are different to each other so that the two contacts will make contact at different points thereon and with a rubbing effect for clearing oxide and other undesired coatings forming on the said contacts.
For producing such a thermal switch with multiple functions, for example the functions of a temperature automatic controller and a thermal protective device, the counter-contact, that is placed so that it may give way elastically, is acted upon by a further bimetallic element.
REFERENCES:
patent: 2698368 (1954-12-01), Lehr et al.
patent: 2724753 (1955-11-01), Miles
patent: 3033960 (1962-05-01), Geller
patent: 4445105 (1984-04-01), Wehl
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