Closure fasteners – Bolts – Swinging and camming
Patent
1991-02-12
1992-05-05
Moore, Richard E.
Closure fasteners
Bolts
Swinging and camming
292DIG49, E05C 304
Patent
active
051101653
ABSTRACT:
A window lock has a window sash mounted housing with a cam which is manually pivotable between a locking position engaging a keeper on a second window sash and an open position clear of the keeper. A bearing post projects from the cam and a spring secured to the housing exerts a biasing force against the post. The spring is a leaf spring having a first portion bearing against the post when the cam is positioned toward the locking position from the neutral position, and a second portion bearing against the post when the cam is positioned toward the open position from the neutral position. A curved portion of the spring connects the first and second portions at an angle relative to each other, and bears against the post when the cam is in the neutral position. The spring biasing force is directed substantially toward the cam pivot axis when the cam is in a neutral position between the locking and open positions, and is overcenter toward the open or locking position when the cam is selectively positioned toward the open or locking position, respectively, from the neutral position. The cam pivots substantially 180.degree. between the open and locking positions, and the neutral position is about 70.degree. from the locking position and about 110.degree. from the open position.
REFERENCES:
patent: 928408 (1909-07-01), Taube
patent: 1257051 (1918-02-01), Thomas et al.
patent: 2679416 (1954-05-01), Tassell
patent: 4736972 (1988-04-01), Mosch
patent: 4801164 (1989-01-01), Mosch
Moore Richard E.
Truth Division of SPX Corporation
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