Patent ID: 6068306
Filing Date: 2000-05-30
Classification: E05C,Y10S,Y10T

Abstract:
In a window locking arrangement including a first movable sash selectively locked to a further sash by means of a lock which is selectively engaged with a keeper wherein the keeper has a spaced locking tab and wherein the lock has a rotatable cam member, said cam member being selectively rotatable about an axis to and from locking and unlocking positions, said cam member having a free end and a remote end, said cam member being of arcuate shape and having an inner side wall which is selectively mounted against said keeper locking tab in said locking position, the improvement being in that said inner side wall of said cam member is of arcuate shape at said free end for first engaging and then pulling in said keeper during rotation from an unlocked to a locked position, said arcuate shape of said free end merging into a flat portion disposed against said locking tab for positioning against said keeper in the locked position to maintain clearance between said sashes and compensate for misalignment between said keeper and said lock, and the distance between said locking tab and said axis of rotation of said cam member being generally the same in both said locking and unlocking positions.