Patent ID: 7400913

Claim:
A device comprising: a base part having a generally planar inner face; a cover part shiftable on the inner face generally parallel to the inner face between a closed position overlying and generally congruent with the base part and an open position offset therefrom and exposing at least part of the inner face; a pair of generally parallel and transversely spaced elongated spring elements extending generally parallel to the inner face and each having at least one end seated in one of the parts and a transversely elastically deflectable center portion; a pivot in the one part between the center portions defining an axis generally perpendicular to the inner face; a nonround cam on the pivot between the spring elements and pivotal about the axis between a pair of end positions engaging and slightly transversely elastically deflecting the center portions and a through a center position engaging and greatly transversely elastically deflecting the center portions; and means connecting the cam to the other of the parts for pivoting the cam between its end positions and through the center position on displacement of the cover part between the closed position and the open position, whereby the spring elements urge the other part into the open and closed end positions from positions therebetween.