Bimetal-controlled overload protection switch

Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – With bimetallic elements

Patent

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Details

337113, H01H 7330

Patent

active

043474942

ABSTRACT:
In an overload protection switch including a narrow housing, bimetal strips mounted in the housing, a pushbutton mounted in, and projecting out of, the housing and made of insulating material, the pushbutton being provided with a partition and being movable relative to the housing between an on position in which a conductive path is established via the strips and an off position in which such conductive path is broken, and a spring device urging the pushbutton into its off position, the housing and bimetal strips are physically symmetrical to the longitudinal center axis of the housing, the path of movement of the pushbutton is along that center axis, there are two identical bimetal strips disposed symmetrically relative to the center axis, each strip having a first part fastened to the housing and a second part which is movable relative to the housing in response to temperature changes, with the second parts converging toward one another while remaining out of contact, the pushbutton carries a conductive contact piece at a location such that in the on position of the pushbutton the contact piece is wedged between the strips and is held thereagainst by the force of the spring device and in the off position of the pushbutton the partition is disposed between the strips.

REFERENCES:
patent: 1939194 (1933-12-01), Angell
patent: 2886670 (1959-05-01), Dillon
patent: 3751618 (1973-08-01), Hallerberg
patent: 3975702 (1976-08-01), Carpenter

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