Automatic thermal shut-off switch

Details Automatic thermal shut-off switch Automatic thermal shut-off switch

1996-12-31

1998-10-27

Picard, Leo P.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With longitudinally expansible solid element

337 3, 337 16, 337 97, 337380, H01H 3748

Patent

active

058282874

ABSTRACT:
A new Automatic Thermal Shut-Off Switch for preventing heat damage to a high pressure low volume water pump. The inventive device includes a T-shaped housing having a longitudinal cavity, a bimetallic compression spring within the cavity, a disc within cavity on top of the spring, a pin orthogonally secured to the disc, a first contact, and a second contact electrically in contact. The housing is positioned within an unused port within a pump housing and conducts the heat produced by the pump. The conducted heat expands the spring thereby forcing the pin upwardly to separate the first contact from electrically contact with the second contact.

REFERENCES:
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patent: 4074575 (1978-02-01), Bergman et al.
patent: 4257745 (1981-03-01), Thur et al.
patent: 4555688 (1985-11-01), Bayer
patent: 4887062 (1989-12-01), Bletz
patent: 5089799 (1992-02-01), Sorenson
patent: 5145322 (1992-09-01), Senior, Jr. et al.
patent: 5181005 (1993-01-01), Bayer
patent: 5309131 (1994-05-01), Hofsass

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