Thermal fuse employing a slidable resilient contact member in a

Details Thermal fuse employing a slidable resilient contact member in a Thermal fuse employing a slidable resilient contact member in a

1976-12-21

1978-01-10

Harris, George

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With fusible, combustible or explosive material

337409, H01H 3776

Patent

active

040682048

ABSTRACT:
A thermal fuse comprises an electrically and thermally conductive housing hermetically sealing switch parts of a fusible temperature-sensitive pellet, metallic plates, compression springs and a slidable resilient contact member. The contact member has a center contact portion at its bottom base and a peripheral contact portion with a plurality of tongues extending from the bottom base. The contact member of resilient conductive material is shaped to form a portion sloping over the bottom base and to form peripheral tongues extending relative to the flat surface of the assembled metallic plate when no external force is applied. The shaped contact member with its peripheral tongues has an outer diameter equal to, or smaller than, the inside diameter of the housing when no external force is applied, whereas the application of a biasing force of one of two compression springs to the contact member expands the outer diameter thereof to be larger than the inside diameter of the housing case to maintain a sufficient contact force between the contact member and the housing.

REFERENCES:
patent: 3727164 (1973-04-01), Cartier et al.
patent: 3778742 (1973-12-01), Merrill
patent: 3944960 (1976-03-01), Audette et al.
patent: 4001754 (1977-01-01), Plasko

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