Importance

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Abstract

A device which can lock a sash to and unlock a sash from a door or window frame has a composite housing which is partially recessed into the frame and receives a portion of a reciprocable plate member which is coupled to one or more motion receiving elements serving to actually lock or unlock the sash. The housing further carries a handle which is pivotable in the plane of the plate member about an axis extending at right angles to such plane, preferably through an angle of approximately 180.degree.. The plate member has one or more sliders which are reciprocable in one or more elongated grooves provided in one or more internal surfaces of the housing. The motion transmitting connection between the handle and the plate member can include a single part, such as a crank, which is non-rotatably connected to the handle and is pivoted to the plate member. Alternatively, the motion transmitting connection can comprise a crank which is non-rotatably connected with the handle and a link which is articulately connected to and forms with the crank a toggle joint. An end portion of the link is articulately connected to the plate member.

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First Claim