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Window particularly for installation in an inclined roof surface

  • US 5,689,916 A
  • Filed: 05/31/1996
  • Issued: 11/25/1997
  • Est. Priority Date: 12/10/1993
  • Status: Expired due to Fees
First Claim
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1. A window, particularly for installation in an inclined roof surface, having an opening angle and comprising a main frame (1) having a top and a frame (3,4) hinged to the top thereof as well as a frame lifting arm (5) inserted between the main frame and the frame, said arm having two ends, one end pivotally connected with a lateral member of one of the main frame and the frame, and its other end pivotally connected with a slide shoe (6) which in a longitudinally displaceable manner is connected with the corresponding lateral member of the other of the frame and the main frame, and which is associated with a pre-stressed lifting spring (13), as a first coupling member (8) on the slide shoe is adapted to be brought into engagement with a second coupling member (9) connected with the lifting spring when installing the window at the installation site, characterized in that an auxiliary spring (12) is located between the slide shoe (6) and the lifting spring (13), pre-stressing of which can be adjusted depending on the roof inclination, by means of a manually operated adjusting element, to exert a parallel spring force for supplementing the spring force from the lifting spring within a given range of the opening angle of the window.

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