Electricity: circuit makers and breakers – Snap – Double snap
Patent
1990-07-23
1992-02-04
Recla, Henry J.
Electricity: circuit makers and breakers
Snap
Double snap
200445, 200408, H01H 518
Patent
active
050861980
ABSTRACT:
An electric switch comprising a fixed contact attached to a casing, a moveable contact piece carrying a moveable contact, an elastic piece which is actuated by an external force between two positions which are located on either side of the moveable contact piece along the common direction of motion of the moveable contact piece and the elastic piece, and a U-shaped spring member engaged between the free ends of the moveable contact piece and the elastic piece. As the elastic piece is moved past the moveable contact piece, the spring action of the U-shaped spring member upon the moveable contact piece changes its direction in such a manner that the moveable contact is positively pressed upon the fixed contact or displaced away from the latter without producing any indeterminate state of contact between the moveable and fixed contacts. Since the U-shaped spring is engaged with the free ends of the moveable contact piece and the elastic piece with the moveable contact piece located therebetween, the distance between the two legs of the U-shaped spring member may be maximized for a given space, and the strains in the U-shaped spring is thereby minimized. Additionally, by providing stoppers for the elastic piece to limit its deformation, it is avoided that the U-shaped spring member be deformed more than necessary.
REFERENCES:
patent: 2521277 (1950-09-01), Aubert
patent: 2740857 (1956-04-01), Porland
patent: 2892050 (1959-06-01), Fisher
patent: 2927171 (1960-03-01), Rhodes
patent: 3322915 (1967-05-01), Johnson
patent: 4843200 (1989-06-01), Parlatore et al.
Barrett Glenn T.
Omron Tateisi Electronics Co.
Recla Henry J.
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