Patent ID: 11168495

Abstract:
A vent stop includes: a housing; a tumbler; a biasing member having a first portion secured to the tumbler and a second portion in movable contact with a housing track, to selectively bias the tumbler. Movement of the second portion along the track is coordinated with sequential pivoting of the tumbler between extended, retracted, partially extended, and intermediate positions. In the extended position, a tumbler bearing surface limits opening of the sash member. When toggled from the extended position to the retracted position and subsequently released, outward bias of the tumbler is limited to the partially extended position by contact of the second portion with a track recess. Subsequent contact of the sash member with the deflection surface causes pivoting from the partially extended to the intermediate position, permitting unrestricted sash member opening, release of the second portion from the contact point, and biasing back toward the extended position.