Patent ID: 7506475

Claim:
A sash counterbalance apparatus disposed in the weight pocket of a window jamb of a vertically operating window, comprising in combination: a mounting block having an open channel and rigidly disposed in the weight pocket; a pivot member rotatably mounted in the open channel of said mounting block; at least one multi-coil spring mounted on said pivot member such that said at least one multi-coil spring can be uncoiled from said pivot member, thereby generating an approximately constant force; a counterbalance connector attached at one end to said sash; at least one connector for attaching said at least one of said at least one multi-coil springs to the other end of said counterbalance connector, such that a desired counterbalance force for said sash is generated; a pulley over which said counterbalance connector travels, said pulley being disposed to engage said counterbalance connector between said sash and said at least one multi-coil spring; whereby said pivot member can be rotated out of an opening in the weight pocket to a position such that said counterbalance connector can be connected to at least one of said at least one multi-coil springs, and rotated back to a recessed position in the weight pocket which permits said sash to be operated in said window frame.