Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – Expansible or vaporizable fluid actuated
Patent
1976-12-22
1978-08-29
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
Expansible or vaporizable fluid actuated
200 83WM, 337317, H01H 3722
Patent
active
041107209
ABSTRACT:
A thermostatic control as shown and claimed in U.S. Pat. No. 3,135,849 in which the reed in this new disclosure has a pair of split legs. One leg of a first set of such pair is a flipper leg and the other leg of such first set carries a contact which is designed to be resistant to erosion from arcing and welding. One leg of another set of such pair of legs carries a contact which is designed to carry current in excess of 20 amp. at 250 V, the other leg of said other set is a flipper leg. A lost motion slot in a flipper spring provides a sequential drive for the two contacts carrying legs such that the arc resisting contact both makes and breaks the electrical circuit and the current carrying contact never makes or breaks the circuit but merely carries the current established by the arc resisting contact.
The control as shown also eliminates a force multiplying adjusting lever and a pivot interface between such lever and the range lever. Reducing the force multiplying and adjusting levers from 2 to 1 improves stability because of the non split stabilizing spring and reduces cost.
REFERENCES:
patent: 3135849 (1964-06-01), Kuhn et al.
Broome Harold
Cutler-Hammer, Inc.
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