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Locking device for windows/sliding doors

  • US 4,927,198 A
  • Filed: 01/03/1989
  • Issued: 05/22/1990
  • Est. Priority Date: 01/03/1989
  • Status: Expired due to Fees
First Claim
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1. A locking device for windows in overlapping relationship including a vertically moveable lower window and a vertically moveable upper window that comprises an upper window frame and a lower window frame, a vertically upstanding pneumatic cylinder having an upper end and a lower end and a piston rod member at said lower end moveable with respect thereto, means pivotally securing said piston rod at its lower end to the upper end of said lower window, a first lower vertical channel frame adjacent and aligned with one side of the lower window and a second upper vertical channel frame having grooves and aligned and coextensive with said lower channel frame and adjacent said one side of the upper window, said pneumatic cylinder having laterally positioned legs forming a U-shaped member that extends longitudinally there along, the legs being adapted to be received in said grooves of said upper channel frame and secured thereto to said upper channel frame and said locking device constituting an integrated unit, a washer mounted on said rod and having a flange facing a lower end of said cylinder and means for moving said washer along said rod so as to adjustably limit movement of said piston rod with respect to said cylinder, thereby controlling movement of said lower window.

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