Safety switch with security structure

Details Safety switch with security structure Safety switch with security structure

1998-06-12

1999-04-06

Picard, Leo P.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337 66, 337345, 337334, 337 68, H01H 7116, H01H 7558, H01H 7154, H01H 7114

Patent

active

058924264

ABSTRACT:
A titterboard type switch with security structure, wherein a relay unit is disposed between two terminal legs connected with power wires and an electrothermal conductor is connected between the relay unit and one of the terminal legs, whereby when powered on, the electrothermal conductor is slightly heated and in the case of overload, the electrothermal conductor creates high temperature. The relay unit is disposed with a resilient movable contact pushable by a sliding member for controlling whether the movable contact contacts with the other terminal leg or not. The sliding plate is pushed by a swinging plate which is shifted by a push button via a linking unit. A bimetallic plate is disposed between the electrothermal conductor and the swinging plate, whereby when the electrothermal conductor creates high temperature due to overload, the bimetallic plate is deformed to release the movable contact from pressing force of the swinging plate, whereby the movable contact is resiliently restored to a power cut state to ensure safety from overload.

REFERENCES:
patent: 4833439 (1989-05-01), Bowden et al.
patent: 4922219 (1990-05-01), Bakhaus et al.
patent: 4937548 (1990-06-01), Sdunek
patent: 5262748 (1993-11-01), Tsung-Mou
patent: 5453725 (1995-09-01), You et al.
patent: 5539371 (1996-07-01), Yu
patent: 5541569 (1996-07-01), Jang

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