Movable or removable closures – Mounted for optional movements – Movable or removable guide
Reexamination Certificate
1999-05-18
2001-05-08
Redman, Jerry (Department: 3634)
Movable or removable closures
Mounted for optional movements
Movable or removable guide
C049S453000
Reexamination Certificate
active
06226923
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to building products generally, and specifically to tilt windows.
DESCRIPTION OF THE RELATED ART
Tilt windows have become prevalent in residential construction, in large part because of their convenience and attractive appearance. The sash of a tilt window is slidable in the vertical direction during ordinary use. To clean the tilt window, one or more latches at the top of the sash are released, permitting the sash to pivot inward for easy cleaning without completely removing the sash.
In the Architectural window class, a window having a test size of at least 1.5 meters× 2.4 meters (5 feet× 8 feet) is required by national standards to be capable of sustaining a load of at least 1900 Newtons per square meter (40 pounds per square foot) with a maximum deflection of any member of the assembly of L/175, where L is the length of the member.
In a window sash having a stile on each side, the maximum deflection under a wind load typically occurs at about the midpoint of the stile, where the wind force causes the stile to deflect inward towards the interior of the building. Thus, the deflection of the midpoint of the stile must be maintained below the L/175 limit.
To allow use of conventional tilt windows for structures that are required to meet the more stringent standards for commercial and architectural class windows, it is known to fasten (using screws or other removable fasteners) a bracket or brace to the window jamb at a height near the midpoint of the sash.
The brace or bracket maintains the maximum deflection below the L/175 limit, but prevents use of the normal tilt feature of the window. To tilt the window inward (e.g., for cleaning), the brace must be removed, typically requiring a tool. Once the brace is removed, there is a likelihood that it will become lost, or that the user will forget to replace the brace, completely defeating the purpose of providing the brace. In addition, the brace or bracket is unsightly.
SUMMARY OF THE INVENTION
The present invention is a window assembly, comprising a frame and a sash. The frame has a jamb on at least a first side of the frame. The jamb has an inwardly extending flange. A sash is disposed within the frame. The sash has a stile with an outwardly extending flange along at least one portion of the stile adjacent the jamb. The outwardly extending flange is fixed relative to the sash. The outwardly extending flange is slidably movable adjacent to the inwardly extending flange. The sash has a first position in which the stile is substantially prevented from deflecting by the inwardly extending flange.
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Hicks James Lawrence
McKeel Robert Leroy
Duane Morris & Heckscher LLP
Graham Architectural Products
Koffs Steven E.
Redman Jerry
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