US Patent 7798541 Lid stay

A lid stay, for furniture, including a first arm (1) and a second arm (2) which are connected to each other so as to be pivotable about a swivel pin (3) between an open position and a closed position; a convex positioning contour (4) that is disposed on the first arm (1), extends around a central axis (5) located parallel to the swivel pin (3), and has the shape of a circular arc when viewed from a cross-section running perpendicular to the central axis (5); a positioning slide (8) which is movably guided along a positioning axis (9) by means of the first arm (1), is provided with a flat support area (12) facing the positioning contour (4), and is spring-biased in the direction of the positioning contour (4); and a sliding block (13), a concave first sliding surface (14) of which slidably leans on the positioning contour (4), while a flat second sliding surface (15) thereof slidably leans on the support area (12). The first sliding surface (14) extends around the central axis (5) in the shape of a circular arc and has the same curvature as the positioning contour (4).