Patent ID: 6892494

Claim:
A lock shoe system comprising: a window comprising a vertical jamb and a sash mounted in the window, a balance shoe mounted on the jamb for vertical movement on the jamb, a platform on said balance shoe configured for vertical support of an item on said platform when an item is on said platform, a bracket fixedly mounted on the sash, a first arm mounted on said bracket, rotating about a first axis, and transferring lift from a first end of said first arm to said bracket, said first end of said first arm being on said platform, a second arm mounted on said balance shoe for rotating about a second axis, a portion of said second arm spaced from said second axis comprising a second end hooking to said jamb at at least one height along the vertical height of said jamb when said second arm is at a first rotary position of said second arm, said portion comprising a third end extending through a first opening in said platform and through a second opening in said first arm when said second arm is at a second rotary position of said second arm.