Importance

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Abstract

A locking device for countering the force exerted by a spring balance while a window sash is in a tilt position or removed from a tilt position in a window frame, includes a shoe and a sash pin, the shoe engaging the walls of a jamb or jambliner when the window sash is tilted or removed from a tilt position, and the sash pin having a tab for preventing disengagement from the shoe during installation in a window frame. The shoe includes a pair of arms, one of which terminates in a barb and the other of which terminates in an angled edge, such that upon rotation, the shoe forms a wedge within a jamb or jambliner. The shoe further includes a plurality of prongs disposed between the arms for retaining the sash pin, and a bore for retaining an attachment mechanism associated with a spring balance. In response to tilting of the window sash away from the vertical axis of the jamb or jambliner, the locking device assumes a locked position as the sash pin rotates the shoe, and the barb and the angled edge engage the walls of the jamb or jambliner. Once engaged, the shoe becomes wedged within the jamb or jambliner such that the shoe is locked in place and effectively counters the forces exerted thereon by the spring balance.

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First Claim