Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With fusible – combustible or explosive material
Patent
1980-03-27
1981-09-29
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With fusible, combustible or explosive material
337408, H01H 3776
Patent
active
042926173
ABSTRACT:
A thermal switch is described which has a pair of axial leads, one of which is electrically insulated from the conductive outer housing and the other of which is in contact with the housing. An electrically-conductive temperature-sensing pellet which is made of solder, or other conductive material, is formed into a donut shape and rests on the bottom of the housing. A donut shaped insulator rests on top of the sensing pellet to protect the pellet from excessive force on it. A ring-shaped sliding contact is placed on top of a ceramic insulator and is bowed outwardly between the ceramic insulator and a conductive disc, which is in contact with the head of the insulated lead, so as to contact the conductive outer wall of the housing. When the temperature-sensing pellet melts, the solder flows allowing the contact to relax to its undeformed state and a spring that surrounds the insulated lead then forces the contact away from the head of the insulated lead. The solder repellent grease preferably surrounds the insulated lead so as to minimize the possibility of melted solder contacting this lead.
REFERENCES:
patent: 4085397 (1978-04-01), Yagher
patent: 4167724 (1979-09-01), McCaughna
Bowen Glenn W.
Broome Harold
Buckman Thomas W.
Illinois Tool Works Inc.
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