Vibration and shockproof overload protection subassembly for an

Details Vibration and shockproof overload protection subassembly for an Vibration and shockproof overload protection subassembly for an

1986-09-29

1987-06-09

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337 70, 335 45, H01H 7116

Patent

active

046723501

ABSTRACT:
A bimetal operated latch subassembly (600) for an electrical device such as an overload/switch device which is a self-contained unit that can be mounted into operative position relative to the trippable member (012) of the electrical device. A bimetal assembly (660) and a pair of terminals (604,621) electrically connected thereto are mounted on a main insulating base (601). A vibration and shockproof latch assembly (610) is preassembled on a stainless steel sub-base (611) which is then secured by a single screw (605) to the main base (601) at the same time coupling the bimetal assembly (660) to the latch (610) in operative relationship. The latch (610) is rendered shockproof by providing a spring-biased linear slider (650) that latches to a transversely pivoted latch lever (613). The latch friction that must be overcome by the bimetal (608) is reduced to a minimum by providing the latch lever (613) with an adjustable bias (614,615) that almost balances the tripping force (Y) of the trippable member (012 ). Calibration for a desired trip curve is attained by providing a screw (664) adjustment of the linkage (661,662) between the bimetal assembly (660) and the spring-biased linear slider (650) thereby to set the tension force on the bimetal (608) at ambient room temperature whereby it will meet the hot and cold ambient temperature trip requirements also without the use of an ambient temperature compensating bimetal or the like.

REFERENCES:
patent: 3944959 (1976-03-01), Kidd
patent: 4486733 (1984-12-01), Moldovan et al.

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