Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With fusible – combustible or explosive material
Patent
1981-02-25
1982-09-28
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With fusible, combustible or explosive material
H01H 3776
Patent
active
043520820
ABSTRACT:
A one-piece wire lead has intermediate its ends a thin, flattened section which is seated against a recessed die surface that is formed on one end wall of a hermetically sealed chamber in a preferably transparent, paraboloidally-shaped plastic housing. The two cylindrical leg sections of the lead project out of the opposite end of the chamber for connection in series with a conductor in a circuit that is to be protected. A plastic, electrically non-conductive, spring-loaded sabot is mounted to reciprocate in the chamber between a retracted position in which a sharp cutting edge on the forward end thereof faces one side of the flattened section of the lead, and an advanced position in which the sabot cutting edge has cut through the flattened lead section, and has extended into a recess in the die surface. Normally a compacted, granular thermal plug is cast or molded around either the sharp cutting edge of the sabot, or its operating spring, thereby normally to retain the sabot in its retracted position. When the ambient temperature of the fuse exceeds a predetermined value the plug melts suddenly and permits its spring to drive the sabot cutting edge suddenly through the flattened section of the wire lead completely to sever the lead intermediate its ends.
REFERENCES:
patent: 3155800 (1964-11-01), Denton
patent: 4030061 (1977-06-01), Gaskell et al.
Barry Leon G.
Rieman Willis E.
Broome Harold
Fasco Industries, Inc.
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