Patent ID: 6289704
Filing Date: 2001-09-18
Classification: E05B,Y10T

Abstract:
An espagnolette-lock for use on a leaf within a sash-frame comprising:a casing;an operating rod movable between a locked position and an unlocked position;a control means for actuating said operating rod, said control means positioned within said casing;springy means for automatically restoring said operating rod to said locked position, said springy means positioned within said casing;manual control means for moving said operating rod to said unlocked position and for resetting said springy means to a compressed condition, said manual control means received within said casing, said manual control means comprising a tumbler being actuatable by a control handle;a locking means for maintaining said operating rod in said unlocked position during an opening of the leaf from the sash-frame, said locking means positioned within said casing; andunlocking means for releasing said locking means when the leaf is closed into the sash-frame so as to return said operating rod to said locked position, said locking means comprising:a toggle joint having a first rod and a second rod connected together by a fulcrum, said first rod being connected through a hinged joint to said operating rod, said second rod being connected through a hinged joint to said casing, said fulcrum and the respective hinged joints of said first and second rods being substantially in alignment parallel to said operating rod when said operating rod is in said unlocked position such that said toggle joint is in an unstable balance position.