Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With fusible – combustible or explosive material
Patent
1979-12-26
1981-07-28
Harris, George
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With fusible, combustible or explosive material
337409, H01H 3776
Patent
active
042813085
ABSTRACT:
The thermal switch of the present invention relates to thermal switches in which an organic pellet melts at a predetermined temperature which thereby allows the switch to change from a closed to an open state. More particularly, the switch is of the axial lead type wherein one of the leads is connected to the outside of a metallic housing for the device, and the other lead passes through an insulator into the interior of the housing. A thermally-sensitive pellet is positioned in the bottom of the metallic housing and a contact member is positioned in the gap between the pellet and the head of the insulated lead. A coiled spring encircles the insulated lead and forces the contact member toward the temperature-sensing pellet. The electrically conductive contact is formed with a bottom which either engages the pellet, or a wafer which is in contact with the pellet, and a top which is partially open and has a pair of inwardly bent ends that contact the head of the insulated lead at an angle. The contact is deformed due to the applied forces so as to engage the metallic housing of the switch. When the pellet melts, the spring forces the contact member away from the head of the insulated lead and the deformed condition of the contact is relaxed so that it is no longer in electrical contact with the metallic outer housing and thus the other lead of the switch.
REFERENCES:
patent: 4109229 (1978-08-01), Plasko
patent: 4167724 (1979-09-01), McCaughna
patent: 4179679 (1979-12-01), Houghland
patent: 4184139 (1980-01-01), Hara
patent: 4189697 (1980-02-01), Hara
Bowen Glenn W.
Buckman Thomas W.
Harris George
Illinois Tool Works Inc.
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