Thermal switch device with spring cup contact

Details Thermal switch device with spring cup contact Thermal switch device with spring cup contact

1978-10-23

1980-04-08

Harris, George

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With fusible, combustible or explosive material

337408, H01H 3776

Patent

active

041975200

ABSTRACT:
A thermal switch device is constructed with an electrical conductive spring cup contact that fits over a ceramic insulator which surrounds one lead of the device. The center of the spring cup contact has a pattern cut in it so that it is flexible, and a metallic, thin flat disc which is placed against the surface of the spring cup contact which forces the flexible portions of the spring cup contact into contact with the head of the lead that supports the ceramic insulator. A conductive cup-shaped housing that is open at one end encloses the entire structure and is in contact with the spring cup contact. The outer ends of the housing being pinched over the ceramic insulator at the open end. A second conductive lead is attached to the outer surface of the conductive housing. A pellet made of a thermally-fusible material is inserted between the housing and the metallic disc so that when it melts the disc moves away from the spring cup contact, thereby breaking the circuit between the spring cup contact and the second lead.

REFERENCES:
patent: 661736 (1900-11-01), Freymann
patent: 2247902 (1941-07-01), Bahr
patent: 2367639 (1945-01-01), Conboy
patent: 2516964 (1950-08-01), Derby et al.
patent: 2955179 (1960-10-01), Milton et al.
patent: 3180958 (1965-04-01), Merrill
patent: 3956725 (1976-05-01), Merrill et al.

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