Window, especially for installation in an inclined roof

• US 4,429,494 A
• Filed: 09/17/1982
• Issued: 02/07/1984
• Est. Priority Date: 12/08/1981
• Status: Expired due to Term

• Current Assignee: VKR Holding A/S (Villum Fonden)
• Original Assignee: V KANN Rasmussen Holding A/S
• Inventors: Kornerup, Klaus, Christensen, Per B.
• Primary Examiner(s): KANNAN, PHILIP
• Application Number:
  US06/419,328
• Time in Patent Office: 508 Days
• Field of Search: 49/381, 49/386, 49/379, 49/346
• US Class Current: 49/386
• CPC Class Codes: E05F 1/1075 for counterbalancing
• CPC Class Codes: E05Y 2900/148 Windows
• CPC Class Codes: E05Y 2900/152 Roof windows

Abstract

In a window, especially for installation in an inclined roof, a secondary frame element or sash is connected with the stationary main frame of the window in a top hinge and is urged in its opening direction by a lifting lever hinged at its one end through a pivot pin to a side member of the secondary frame element or the main frame, while its other end is pivotally and displaceably connected with the adjacent member of the main frame or the secondary frame element, respectively, said lever being biassed by a spring tending to displace said other end in a direction corresponding to opening the window.

The said other end of the lever is provided with several pins which during the opening or closing movement of the window successively become operative as the pivot point, thereby giving the lever a varying effective length, whereby the curve of the spring balancing moment performed on the frame element may be optimized and, if desired, a series of stable positions of rest for the tilting frame may be obtained.

Claims

1. A window, especially for installation in an inclined roof, comprising a main frame, a secondary frame element top-hinged therein, and a frame element lifting lever inserted therebetween and having one end pivotally connected with a side member of the secondary frame element or the main frame while its other end is pivotally and displaceably connected with the associated side member of the main frame or the secondary frame element, respectively, and is urged by a spring for displacement along said side member in a direction away from the hinge point between the main frame and the secondary frame element, said other end of the secondary frame element lifting lever presenting at least two pivot points having different distances from the pivot point at the first mentioned end of the lever and being, moreover, located so as to successively becoming operative during the opening of the window to succesively increasing the effective length of the lever.

2. A window as claimed in claim 1 and in which the said other end of the secondary frame element lifting lever is connected with the spring through a slide displaceable along the side member concerned, wherein said lever comprises three approximately equidistant pivot pins, the central one of which is laterally displaced from the connecting line between the two other pivot pins in a direction pointing away from the first mentioned end of the lever, the slide comprising three corresponding bearing recesses which are mainly in alignment with each other.

3. A window as claimed in claim 2, wherein the bearing recess associated with the central pivot pin is constituted by the one end portion of an elongate aperture provided in the slide.