Trip-free manual reset thermostat

Details Trip-free manual reset thermostat Trip-free manual reset thermostat

1982-10-18

1984-10-30

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337 91, H01H 3704

Patent

active

044802463

ABSTRACT:
A trip-free manual reset thermostat is disclosed in which a bimetal snap disc is positioned so that one edge portion engages a movable contact support arm and opens the contacts when the disc operates to its operative condition. A manual reset member is operable to apply a force to the center portion of the disc in the direction of contact opening, causing the edge of the disc to engage fixed stops and to thereafter move the disc to its reset position. The resetting force is applied in the same direction as contact opening movement so that the operation of the reset member maintains the contacts in an open condition even when the disc has been pushed through to the reset condition. The manual reset member is, therefore, incapable of causing switch closure.

REFERENCES:
patent: 2948787 (1960-08-01), Frey et al.
patent: 3322920 (1967-05-01), Morris
patent: 3541488 (1970-11-01), Odson
patent: 3621434 (1971-11-01), Gerich
patent: 3660793 (1972-05-01), Them et al.
patent: 3675178 (1972-07-01), Place

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