Title: Anti-leakage window frame construction for tilt-in window sash

Abstract: A tilt-in window assembly of the type wherein the sash is conventionally held only at the top and bottom between extruded window frame side rails, previously allowing the sash to be bowed inwardly by heavy wind forces. The extruded window frame is now provided at its side rails with protrusions extending for the entire height of the frame. The sash has side flanges which cooperate with the side rail protrusions to limit the inward bowing of the sash so as to prevent the sash weather-stripping from disengaging from its normal sealing contact surfaces, thereby preventing external air from passing by the weather-strippping.

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Inventors: Kessler, Gerald

Application Number: 009061
Filing Date: 1979-02-02
Publication_date: 1980-10-07
Assignee:
Primary Class(es): 49/181 49/453
Other Classes:
US Patent Ref:

3500586	Mar, 1970	Johnson	49/445.
3611636	Oct, 1971	Trout	49/181.
3676956	Jul, 1972	Taylor et al.	49/181.
3959926	Jan, 1976	Noecker et al.	49/181.
4144674	Mar, 1979	Dovman	49/181.

Other Refs:
Primary Examiner: Downey, Kenneth
Assistant Examiner:
Attorney: Browdy and Neimark