Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With bimetallic element
Patent
1979-06-18
1981-08-04
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With bimetallic element
337372, H01H 3704, H01H 3752
Patent
active
042825067
ABSTRACT:
A device for sensing overheating of bearings comprises a high-heat-conductivity metallic (copper) sheet adapted for shape-conforming fixed face-contact with an exposed surface of a bearing assemblage. A flat-bottomed brass cup is fixed to the upper surface of the copper sheet, as by pop-type rivets passing through flanges extending laterally from the cup bottom. A snap-disc thermostat lies within and against the bottom of the cup for good heat-exchange with the cup and with the sheet and thus with the bearing assemblage. The cup houses a pair of normally separated switch arms, one of which is engageable by a button of insulating material (attached to the thermostat disc) when the disc snaps to its bearing-overheated position. The device is housed by a piece of plastic tube that snugly embraces the end of the sheath of a two-wire insulated cable electrically connected to the switch. The tube's other end is split and is expanded over the cup and is fixed thereto by a high-temperature-resistant plastic electrically insulating packing material.
REFERENCES:
patent: 4059817 (1977-11-01), Hollweck et al.
patent: 4091354 (1978-05-01), Deubel et al.
Broome Harold
Staubly Ralph F.
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