Window safety system

In combination, a window frame having members including a header, a sill and a pair of jambs defining a sash receiving opening;

• a sash member mounted in said opening for pivotal movement about a pivot axis extended transversely between opposite one of said frame members between a closed, open and a reverse position relative to said frame member;
• and
• a releasable latch assembly positioned apart from said axis and one of said jambs at an adjustably selected spacing therebetween, said latch assembly interconnecting said frame member and said sash member for limiting the amount of initial pivotal opening movement of said sash member out of said closed position into a limited open position and including key releasable means operable for permitting further pivotal opening movement of said sash member out of said limited open position through a freely pivotal open position toward said reverse position, said latch assembly including an arm pivotally attached to one of said members and including a slot therein having an opening for slidably receiving a pin mounted on another of said members,
• said key releasable means including means for limiting the pivotal movement of said arm for preventing disengagement of said pin from said opening of said slot thereby limiting the amount of pivotal opening movement of said sash member out of said closed position, into said limited open position and operable by a key to permit said pin to move out of engagement with said slotted arm allowing free pivotal movement of said sash member relative to said frame member between said limited open position and said reverse position.