Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – With longitudinally expansible solid element
Patent
1978-02-16
1980-01-15
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
With longitudinally expansible solid element
337102, 337138, H01H 6102, H01H 6106
Patent
active
041841360
ABSTRACT:
A snap-action thermal relay in which a thin sheet of spring material having a central opening is mounted at one point along one edge and is crimped along an adjacent edge to distort the sheet into a slightly convex bowed shape. A heater element in the form of a thin band of metal is anchored at either end to the normally convex surface of the sheet adjacent opposite edges of the sheet, with a bridging member inserted between the band and the sheet to put the band under tension. A printed circuit heating element is applied to the band on the side opposite from the sheet. The tension in the band holds the sheet in a concave bowed condition. Heating of the bank reduces the tension in the band and allows the sheet to snap back to its normal convex bowed condition. This action brings the band into direct thermal contact with the convex surface of the sheet over a substantial length of the band to provide good conductive transfer of heat from the band and heater to the spring sheet.
REFERENCES:
patent: 2189996 (1940-02-01), Riche
patent: 2489391 (1949-11-01), Thomson
patent: 2776352 (1957-01-01), Davis
patent: 2822444 (1958-02-01), Colombo et al.
patent: 3174012 (1965-03-01), Siiberg
patent: 3174013 (1965-03-01), Siiberg
patent: 3201547 (1965-08-01), Bleiweiss et al.
patent: 3305654 (1967-02-01), Siiberg
patent: 3441890 (1969-04-01), Prickett
patent: 3538478 (1970-11-01), D'Entremont et al.
patent: 3805060 (1974-04-01), Way
Bell Lon E.
Diller Robert W.
Broome Harold
Technar Incorporated
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