Pulley lift assembly and curtain system employing same

Claim 1

A vertically lifting curtain system comprising: a. a plurality of pulley lift assemblies, each comprised of a horizontally adjustable clamp means adapted to engage with an overhead beam, said clamp means having mounted thereon: 1) vertically adjustable means for supporting a curtain, 2) a grooved wheel positioned for rotation in a vertical plane and adapted to receive a cable utilized for the lifting of said curtain, and 3) a cable guard adapted to maintain said cable in contact with said wheel, and 4) cable guide means, said assemblies being mounted by their adjustable clamp means in spaced relationship on an overhead beam and aligned such that the grooved wheels of said assemblies are essentially coplanar, b. a curtain having horizontally disposed upper and lower edges, each maintained in straight configuration by engagement with a rigid elongated member traversing its entire length, and spaced groups of vertically aligned guides, said curtain being supported by said vertically adjustable means which attach to the rigid elongated member engaging the upper edge of said curtain, c. a cable associated with each of said pulley lift assemblies, said cable being connected to the rigid elongated member engaging the bottom of said curtain, and extending through a group of vertically aligned guides in said curtain, entering onto the grooved wheel of said assembly for essentially 90° of turning angle, leaving said wheel in a substantially horizontal direction, passing through cable guide means associated with said pulley lift assemblies, and communicating with d. winding means adapted to act on said cables in unison.