Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With bimetallic element
Patent
1979-06-18
1981-05-19
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With bimetallic element
337372, H01H 3704
Patent
active
042688124
ABSTRACT:
A miniature device for sensing overheating of bearings has a small flat-bottomed circular cup (e.g. fifteen millimeters in diameter) and has an integrally connected co-axial heat-conducting rod extending downwardly from its lower surface for good heat-exchange insertion into a bore made for it in a bearing element. The rod is preferably threaded to improve both its anchorability and its heat-exchange value. A bimetallic snap-disc thermostat lies in and on the bottom of the cup. A small inverted cup of electrically insulating hard plastic has a beaded lip embraced by the crimped rim of the metallic cup to form a housing for a normally closed switch whose spring-arm contact elements are fixed to the inverted plastic cup. An insulating disc closes the bottom of the inverted cup, forms a shallow retaining chamber for the snap-disc, and is centrally axially bored to serve as a guide for an insulating pin by which the thermostat disc operates the switch. The switch assemblage is packed in insulating plastic material in a close-fitting plastic housing.
REFERENCES:
patent: 3575645 (1971-04-01), Doversberger
patent: 3861032 (1975-01-01), Schmitt et al.
Broome Harold
Staubly Ralph F.
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