Reduced-size thermal overload relay

Details Reduced-size thermal overload relay Reduced-size thermal overload relay

1984-06-28

1985-07-09

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337 38, H01H 3770

Patent

active

045285390

ABSTRACT:
A reduced-size thermal overload relay having a housing (2) that includes three narrow compartments (2k, 2l, 2m) in which are mounted three connector brackets (16,18,20) supporting three flat bimetal members (16j, 18j, 20j). Three narrow cassette heaters (6,8,10) are mounted at the upper part of the housing and held in by a snap-in hold-down device (12) that engages pairs of hooks (6b, 7b) at the lower portions of the heaters. A pushbutton (12a) on the hold-down device extends through a hole (3c) in the front wall of the housing for manual depression to release the heaters for removal. Each bracket (16) is H-shaped having legs (16c, 16d) for mounting it in a housing compartment (2k) and arms (16a, 16b) connected by a platform (16e) to which the upper terminal clip (6d) of the cassette heater is clamped with a screw (16q), the small angles of this platform and terminal clip automatically drawing the flat heater element (6c) into desired spacing with the bimetal member. The current flow down the arms (16a, 16b) prevents loss of heat through the terminal lead (16h). A switch (4) mounted at the side of the housing is tripped by a joint or differential operating mechanism (28,30,32) mounted below the three compartments and actuated by the three deflecting bimetal members.

REFERENCES:
patent: 2798140 (1957-07-01), Kohring
patent: 3316374 (1967-04-01), Nelson
patent: 3564475 (1971-02-01), Fujii et al.
patent: 3792401 (1974-02-01), Anderson
patent: 3800260 (1974-03-01), Woodger
patent: 4096465 (1978-06-01), Fryer
patent: 4203025 (1980-05-01), Nakatani et al.
patent: 4204107 (1980-05-01), Ohkubo et al.
patent: 4237442 (1980-12-01), Carter
patent: 4242565 (1980-12-01), Schoon
patent: 4410874 (1983-10-01), Scapple et al.
patent: 4413170 (1983-11-01), Val et al.

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