Abstract: A balancing spring system for facilitating the opening and the closing of a window sash assembly slidably mounted in channels of opposed window jambs comprises a connector strip. The connector strip has a front surface and a rear surface. The connector strip also has slots extending from the front surface to the rear surface. The connector strip has a connecting head section at a bottom thereof, adapted for connection to the window sash assembly. Curled ribbon springs are adapted to be mounted idle and free to rotate in each of the channels of the window jambs. The curled ribbon springs each have a free end comprising an enlarged head portion at a tip thereof, for connecting the curled ribbon springs to the slots of the connector strip, whereby the curled ribbon springs apply an upward force to the window sash assembly.

Abstract: A balancing spring system for facilitating the opening and the closing of a window sash assembly slidably mounted in channels of opposed window jambs comprises a connector strip. The connector strip has a front surface and a rear surface. The connector strip also has slots extending from the front surface to the rear surface. The connector strip has a connecting head section at a bottom thereof, adapted for connection to the window sash assembly. Curled ribbon springs are adapted to be mounted idle and free to rotate in each of the channels of the window jambs. The curled ribbon springs each have a free end comprising an enlarged head portion at a tip thereof, for connecting the curled ribbon springs to the slots of the connector strip, whereby the curled ribbon springs apply an upward force to the window sash assembly.

Abstract: A sash pivot assembly, for supporting a window sash in sliding and pivotal displacement within a window frame, is comprised of a housing having a pivot rotor rotatively mounted therein. The pivot rotor has a slot comprising a spring clip defined by a U-shaped spring comprising lateral side arms having inwardly embossed portions, for snap-locking and snap-releasing engagement with a sash pivot.

Abstract: A shimming device for installation and level adjustment of a frame in an opening of a wall structure is described. The device comprises a housing securable in a space defined between the opening of the wall structure and an outer surface of the frame. A leaf spring is secured in the housing and a bolt fastener causes the spring to extend out of the housing and retract therein. The spring, when in its extended condition from the housing, engages a surface adjacent the space. The frame is held in securement and is level-adjusted in the opening by opposed shimming devices secured in opposed spaces defined between the opening and the frame. It is pointed out that no screws are inserted through the frame for its securement in the opening. The device may also be comprised of a leaf spring which is actuable by a strapping element which is securable to the surrounding structure.