Patent ID: 7587787
Filing Date: 2009-09-15
Classification: E05D,E05Y,Y10T

Abstract:
1. A coil spring for a balance assembly for a sash window slidable within a master frame, the balance assembly having a shoe having a curved slot, the coil spring comprising: a spring having a coiled portion and a free portion, the coiled portion being wound upon itself wherein portions of the coiled portion engage one another to define the coiled portion, the coiled portion configured to be supported by the master frame, the spring having a length and a width defined generally transverse to the length, wherein the width of the spring is constant along the length of the spring that extends between the coiled portion and the free portion, and the free portion having a curved end configured to be received in the curved slot of the shoe, the free portion having the curved end in an independent state prior to connection to the shoe.