Biased check rail lock

Details Biased check rail lock Biased check rail lock

E - Fixed Constructions

05

C

E05C 3/12 (2006.01) E05C 3/04 (2006.01) E05B 15/04 (2006.01)

Patent

CA 2049140

BIASED CHECK RAIL LOCK 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 di- rected substantially toward the cam pivot axis when the cam is in a neutral position between the locking and open posi- tions, and is overcenter toward the open or locking posi- tion when the cam is selectively positioned toward the open or locking position, respectively, from the neutral posi- tion. The cam pivots substantially 180° between the open and locking positions, and the neutral position is about 70° from the locking position and about 110° from the open position.

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