FLUSH LOCK FOR CASEMENT WINDOW AND METHOD OF OPERATING THE SAME

摘要

A low profile actuating window lock for casement windows having a handle actuate a lifter that slides vertically on a fork component in slidable communication with the window lock casing, the handle pivotable about the lifter and pivotable about a restrictor arm that pivots relative to the casing, allowing the handle to rotate fully from the locked position to the unlocked position with low clearance from the window frame. The pivot points of the handle, lifter, restrictor arm configuration allow for an over center linkage that prevents back driving the casement window lock.

主权项

1. A method of locking a casement window having:
an elongated casing with a substantially horizontal sidewall section and a vertical section shorter in length than said sidewall section; a fork component adapted to engage a lock bar external to said lock, said fork component in slidable communication with said casing; a lifter in slidable communication with said fork component; a restrictor arm pivotally attached to said casing; and a handle pivotally attached at one end to said lifter, and pivotally attached at an intermediate point on said handle to said restrictor arm; said method comprising: rotating said handle to engage said lifter and move said fork component horizontally along said casing horizontal sidewall section while simultaneously vertically shifting said lifter relative to said fork component to allow said handle to fully rotate approximately 180° F. from an initial position.