Patent ID: 9045928
Filing Date: 2015-06-02
Classification: E05F,E05Y,E06B

Abstract:
1. An apparatus to raise and lower an overhead door comprising: A single lift mechanism to provide all force needed to fully raise said overhead door from a lowered position, wherein said lift mechanism is positioned to a side of said overhead door; A single master pulley block; a pulley mounted to said lift mechanism, and in association with said master pulley block; a plurality of guide sheaves, each of said plurality of guide sheaves associated with said master pulley block and supported by an elongated support member, each of said guide sheaves being spaced from said master pulley block; and a plurality of cables, each of said cables having a first and a second opposed end and passing from said first end at a first attachment point around said pulley attached to said lift mechanism and passing to and around said master pulley block, after which each cable passes over a separate associated one of said plurality of guide sheaves, thereby distributing each of said plurality of cables along the length of said support member, wherein each cable of said plurality of cables attaches at said second end by attachment means to an overhead door at multiple points along the door in order to distribute the lifting force evenly along the door.