Inverted constant force window balance for tilt sash

摘要

A window balance may include a shoe body with an elongate portion and an enlarged portion. The elongate portion may include at least one carrier section for supporting a coil spring and an enlarged portion may include a locking element and a cam in communication with the locking element. The width of the enlarged portion may be greater than the width of the elongate portion. The spring may rest in the carrier section and may be secured to a window jamb with a fastener or a mounting element.

主权项

1. An inverted constant force window balance system comprising:
a shoe body comprising:
an elongate portion comprising at least one carrier section comprising at least one curved surface for supporting rotation of a constant force coil spring thereon;a first enlarged portion at a proximal end of the elongate portion, the first enlarged portion comprising a locking element and a cam in communication with the locking element; anda second enlarged portion at a distal end of the elongate portion, the second enlarged portion comprising means for wiping a constant force coil spring surface,wherein the first and second enlarged portions each comprise a width greater than a width of the elongate portion; a constant force coil spring supported in the carrier section; and means for securing the coil spring to a window jamb channel.