Patent ID: 7219711
Filing Date: 2007-05-22
Classification: E05D,E05F,E05Y

Abstract:
1. A bi-fold overhead door comprising: a first door panel rotatively coupled to a header of a door opening by a hinge structure; a second door panel rotatively coupled to a lower edge of the first door panel; a rotatable shaft secured to the second door panel adjacent a lower edge thereof, the rotatable shaft having a take up spool mounted thereon, the take up spool having a first end of a cable secured thereto, a second end of the cable being secured to the header of the door opening such that as the rotatable shaft rotates, the take up spool winds the cable up on the take up spool, thereby raising the lower edge of the lower panel and raising the overhead door; and, a hydraulic power unit coupled to a hydraulic motor, the hydraulic motor being coupled to the rotatable shaft for rotating the shaft so as to wind the cable on the take up spool.