Abstract: A window sash assembly which comprises an outer metal sash, an inner sash positioned and assembled indoors adjacent to said outer sash and a peripheral edge member positioned about the inner end of said inner sash to cover the adjacent open end of an indoor wall member, is disclosed. Said inner sash includes a main portion of adiabatic material which integrally includes said peripheral edge member at the inner end portion thereof to thereby form a sash main frame extending from said peripheral edge member to the indoor pieces of said outer sash. Metal upper and lower rail frames and metal left-hand and right-hand door boxing frames are positioned along about the inner periphery of said sash main frame. Said sash main frame is formed into a framework and said upper and lower rail frames and left-hand and right-hand door boxing frames are formed into a framework within said framework of the sash main frame.

Abstract: A window sash balancer is provided for use with slide-out sash windows, double-hung sash windows or the like. The balancer includes a housing, a shaft rotatably supported in the housing and having one end projecting beyond the housing, and a spring disposed within the housing and having one end secured to the housing and the other end to the shaft. The spring normally biases the shaft in one direction of rotation. The shaft has at its projecting end a drum of a frustoconical shape around which there is wound a wire member. A cord is provided in and along a spiral groove defined by adjacent turns of the wound wire member and has one end secured to the drum, the other end being adapted to be connected to a window sash.

Abstract: A window assembly has a pair of sashes slidable along respective rails formed in parallel spaced relationship on each of the header and sill of an outer frame. A windtight sealing strip of generally arcuate shape is installed in a prescribed position on a horizontal surface between the bottom edges of the sill rails to prevent the intrusion of the wind into the room from under the meeting portions of the two sashes. The sealing strip is made of resilient material and has one end immovably secured against the horizontal surface and the opposite end held in slidable contact therewith. The sashes are installable into, and removable from, the outer frame from inside the room without the need for moving the sealing strip away from its prescribed position.