Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – With bimetallic elements
Patent
1980-12-11
1982-02-02
Harris, George
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
With bimetallic elements
337381, H01H 6101
Patent
active
043142230
ABSTRACT:
A thermal protective device for interrupting current to the lamp circuit of an electrical lighting fixture when the temperature at a preselected location in the fixture reaches a predetermined level, comprises a receptacle including a pair of female terminals coupled electrically to the lamp circuit. A normally open switch having a movable contact arm with a hooked end portion is coupled to one of the terminals to maintain the lamp circuit normally open. A plug adapted for joinder with the receptacle includes a pair of male terminals arranged for receipt by the female terminals of the receptacle. A thermal protector included in the plug is operable from a closed to an open condition when the temperature reaches the aforesaid predetermined level. The thermal protector is connected electrically across the male terminals. An actuator and latch arm extending from the plug is received in the receptacle upon joinder of the receptacle and plug. The actuator and latch arm moves the switch contact arm to close the switch thereby completing the lamp circuit through the thermal protector. At the same time, the actuator and latch arm engages the hooked end portion of the contact arm to disengageably couple the receptacle and plug.
REFERENCES:
patent: 1683992 (1928-09-01), Shoenberg et al.
patent: 1733743 (1929-10-01), Ludwig
patent: 2458724 (1949-01-01), Parissi et al.
patent: 4131868 (1978-12-01), Dombrowski et al.
Gealow Jon Carl
Harris George
LaPorte Ronald J.
MacKinnon Charles W.
McGraw-Edison Company
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