Invention Application
- Patent Title: Cable drum construction of door lift mechanism for multiple horizontal panel garage door with disproportionally heavy top portion
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Application No.: US13293920Application Date: 2011-11-10
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Publication No.: US20130048232A1Publication Date: 2013-02-28
- Inventor: Raymond J. Friesen , Surinder Sambhi
- Applicant: Raymond J. Friesen , Surinder Sambhi
- Applicant Address: US IL Dixon
- Assignee: Raynor MFG. Co.
- Current Assignee: Raynor MFG. Co.
- Current Assignee Address: US IL Dixon
- Main IPC: E06B9/68
- IPC: E06B9/68 ; B65H75/18

Abstract:
A cable lift mechanism for a multi panel, overhead garage door includes a drum having a spiral groove comprised of two adjacent sections that are generally coaxial with the longitudinal axis of the cable drum. The groove or grooves in a first section adjacent the attachment end of the cable to the drum have a lesser radius than the remaining grooves of the second section of the drum which have substantially equal radii of greater diameter than the first section radii. As a consequence, initial torque associated with lifting of a garage door is increased to lift a heavier upper or top panel or panels of a multi-panel garage door.
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