Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With fusible – combustible or explosive material
Patent
1975-12-22
1977-04-12
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With fusible, combustible or explosive material
337404, 337407, H01H 3776
Patent
active
040178188
ABSTRACT:
A thermal switch for automatically opening a circuit when the ambient temperature is increased to a predetermined level. A pair of conductor wires are arranged in side by side fashion with extremities extending in the same direction. A spring portion is included in at least one of the conductor wires to provide stored energy when the spring is biased into electrical contact with each other. A localized contact region is included in the conductor wire in the region below the spring portion. The extremities, contact region, and spring being encapsulated with a heat fusible material which biases the conductor wires into contact with each other and which is coated with a rigid insulating material to retain the conductor wires electrically insulated from each other except at the contact region. The heat fusible material holding the conductors into electrical contact until the temperature level reaches the level at which the fusible material flows thereby allowing the contacts to be separated due to the energy stored by the spring.
REFERENCES:
patent: 662032 (1900-11-01), Sitts
patent: 2149773 (1939-03-01), Huntley
patent: 3198914 (1965-08-01), Baran
patent: 3519972 (1970-07-01), Merrill
patent: 3956725 (1976-05-01), Merrill et al.
Beart Robert W.
Broome Harold
Buckman Thomas W.
Illinois Tool Works Inc.
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