High temperature, temperature responsive snap acting control mem

Details High temperature, temperature responsive snap acting control mem High temperature, temperature responsive snap acting control mem

1993-12-14

1995-03-28

Donovan, Lincoln

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

337343, H01H 3700

Patent

active

054020999

ABSTRACT:
A snap acting control member (10, 10b) having high actuating temperatures comprises metal layers metallurgically bonded together with a low expansion (12) and a relatively high expansion layer (14) each having similar moduli of elasticity and the low expansion layer being formed of a precipitation hardenable stainless steel so that after forming into a dished shaped configuration to make the member snap acting the low expansion layer is heat treated to increase the strength. The control member can be used solely to sense temperature or it can be used as an electrical current carrying member. When used in the latter manner, the electrical resistivity of the member can be adjusted by interposing a selected layer (16) between layers (12) and (14) to thereby increase or decrease the resistivity of the member (10b) depending on the particular metal chosen for the interlayer. An electrical switch (24) is shown in which a snap acting member is used as a sensor and another electrical switch (48) is shown in which the snap acting member is a current carrying member.

REFERENCES:
patent: 3715699 (1973-02-01), Hire
patent: 4492946 (1985-01-01), Loescher
patent: 5107235 (1992-04-01), Torres-Isea
Thermostat Metals Designer's Guide Publisher: Texas Instruments Incorporated Published: 1991.

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