Window assemblies

Claim 1

A SELF-WEATHERSTRIPPED, PLURAL SASH WINDOW ASSEMBLY, DESIGNED FOR MOUNTING IN A WINDOW OPENING FORMED IN A SHEATHED BUILDING SURFACE AND HAVING PARALLEL SIDES, COMPRISING IN COMBINATION, (A) A FACING PAIR OF ELONGATED PARALLEL JAMBS SPACED APART TO BE POSITIONED ALONG OPPOSITE PARALLEL SIDES OF THE WINDOW OPENING AND EACH HAVING PROTRUDING INNER AND OUTER FLANGES FACING TOWARD THE OPPOSITE JAMB WITH INTURNED RETAINER RIMS THEREON; (B) A PAIR OF ELONGATED TRACK GUIDES, EACH (1) SPANNING THE SPACE BETWEEN THE FLANGES OF ONE JAMB AND HAVING PARALLEL EDGES FITTING BEHIND THE INTURNED RIMS THEREOF, AND (2) HAVING A FIRST SASH GROOVE AND AN ADJACENT SECOND SASH GROOVE BOTH CONCAVELY-ARCHED IN CROSS-SECTION AND SUBSTANTIALLY PARALLEL TO THE PARALLEL EDGES OF THE TRACK GUIDE; (C) MEANS SPACING THE ENDS OF THE FACING JAMBS A PREDETERMINED DISTANCE APART, (D) A PAIR OF SASHES EACH HAVING CONVEXLY-BOWED SIDE EDGES ENGAGING ONE OF THE CONCAVELY-ARCHED SASH GROOVES OF EACH OF THE TRACK GUIDES AND DIMENSIONED TO URGE THE TRACK GUIDES APART BETWEEN THE JAMB FLANGES AND AWAY FROM THE RETAINER RIMS THEREOF, (E) AND DEPRESSIBLE RESILIENT MEANS POSITIONED BETWEEN EACH TRACK GUIDE AND ITS JAMB, URGING THE TRACK GUIDE TOWARD THE BOWED SIDE SASH EDGES TO PRODUCE SLIDING GRIPPING CONTACT BETWEEN THE ARCHED SASH GROOVES OF EACH TRACK GUIDE AND THE BOWED SIDE SASH EDGES ENGAGED THEREIN, (F) WITH THE CONCAVELY-ARCHED FIRST SASH GROOVE AND THE CONCAVELY-ARCHED SECOND SASH GROOVE BEING JOINED ALONG A SMOOTH CONTINUOUS RIDGE FORMED ALONG THEIR INTERSECTION BY INTERSECTING PLANES TANGENT RESPECTIVELY TO EACH GROOVE AT THEIR JUXTAPOSED ADJACENT EDGES, WITH THE INCLUDED RIDGE ANGLE BETWEEN THESE TANGENT PLANES BEING AN OBTUSE ANGLE, WHEREBY THE CONVEXLYBOWED SIDE EDGES OF EACH SASH MAY BE SLIDINGLY TRANSFERRED FROM EITHER GROOVE PAST SAID RIDGE INTO THE ADJACENT GROOVE BY FORCES APPLIED PERPENDICULAR TO THE SASH WHICH CAUSE LATERAL DEPRESSIBLE CAMMING DISPLACEMENT OF THE TRACK GUIDES.