Pivot mechanism for pivoted windows

A pivot mechanism for use between a window frame member and a window sash edge which is pivotally movable relatively to the window frame member, said pivot mechanism comprising:

• (a) a stationary base adapted to be secured to the window frame member;
• (b) a slide base slidably mounted on said stationary base for pivotal engagement with the window sash edge;
• (c) a threaded element threadedly extending through one of said bases substantially along the longitudinal direction of the window frame member;
• (d) means coupling said threaded element with the other base while allowing rotation of said threaded element about its axis, whereby said slide base is movable relative to said stationary base in the longitudinal direction of the window frame member by turning said threaded element;
• (e) means limiting the movement of said slide base relative to said stationary base and securing said slide base to said stationary base;
• (f) a pivot shaft adapted to be mounted on the window sash edge and project toward the window frame member, said slide base being movable into a position in which said stationary and slide bases jointly provide bearing means for the pivot shaft;
• (g) said bearing means comprising a curved wall on said slide base defining a substantially semicircular recess receiving said pivot shaft, and a flat surface on said stationary base, said flat surface closing said semicircular recess when said slide base is in said position, whereby said pivot shaft can be retained in said recess;
• (h) said slide base including an elongated indentation extending in the direction in which the slide base is movable, said substantially semicircular recess opening toward said elongate indentation, and said flat surface on said stationary base being disposed in said elongate indentation.