Bi-metal snap disc operated relay

Details Bi-metal snap disc operated relay Bi-metal snap disc operated relay

1983-01-31

1984-11-06

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337104, 337354, 337370, H01H 3752

Patent

active

044814941

ABSTRACT:
A thermal relay is disclosed which provides a bi-metal snap disc actuator system. The actuator system includes a central divider of material having relatively low thermal conductivity and a metallic disc cup mounted on each side of the central divider. A bi-metal snap disc is located in each disc cup and a separate heater is provided to respectively heat the discs. The discs are mounted so that they tend to move toward each other at normal environmental temperatures and a bumper is interposed between the discs to cause them to move in with snap action in the unison. The actuator operates two switches. In one embodiment, one switch is normally closed and the other switch is normally open. In another embodiment, both switches are normally open.

REFERENCES:
patent: 2002467 (1935-05-01), Blodgett
patent: 2324161 (1943-07-01), Holmes
patent: 2446831 (1948-08-01), Hottenroth, Jr.
patent: 2471924 (1949-05-01), Bolesky
patent: 3534314 (1970-10-01), Ellengerger
patent: 3582853 (1971-06-01), Morris
patent: 4105897 (1978-08-01), Stratton et al.
patent: 4106007 (1978-08-01), Johnston et al.
patent: 4307367 (1981-12-01), Mellentin et al.

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