Thermal circuit breaker apparatus

Details Thermal circuit breaker apparatus Thermal circuit breaker apparatus

1998-05-04

1999-01-19

Picard, Leo P.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337348, 337362, 337380, H01H 7116, H01H 3754

Patent

active

058617949

ABSTRACT:
An open ended cup shaped housing (12) has first and second spaced electric terminals (14,16) extending through the bottom wall of the housing into a switch chamber with a snap acting, current carrying disc (18) cantilever mounted on one terminal and having a movable contact (20) movable into and out of engagement with a stationary contact (22) mounted on the other terminal. A reset member (28) is received in the housing and has a first leg (28b) formed with a catch (28g) normally biased against the edge of the disc with the catch receivable under the disc upon opening of the contacts. A force applying member (32, 38) is mounted on a lid and upon depression applies a force through a flexible, environmental gasket disposed across the open end of the housing causing a second leg (28c) to displace the catch and allow the contacts to reengage. In a modified embodiment a two piece (34, 36) reset member is shown. A momentary break is shown having a pivotable arm (44) which has an end (44c) with a reverse bend received under the free end of the disc and a force receiving surface (44d) which, when depressed, raises the free end of the disc to separate the contacts. When combined with the manual reset member (28) the switch arm (44) forms a manually switchable device in which the catch moves under the disc when the edge of the disc is raised through thermally caused snap action or manual lifting of the disc.

REFERENCES:
patent: 2696538 (1954-12-01), O'Neill
patent: 3686601 (1972-08-01), Kaczmarek et al.
patent: 3913049 (1975-10-01), Burch
patent: 3924213 (1975-12-01), Semple
patent: 4039991 (1977-08-01), Bucheister
patent: 4371859 (1983-02-01), Sorimachi
patent: 4480246 (1984-10-01), Schmitt

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