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.

Abstract: A roller hinge assembly for connecting articulating door panels and simultaneously supporting a laterally extending panel support roller assembly includes multiple uniformly sized hinges having a male hinge strap and a female strap. Two or more such uniformly sized hinge units are arrayed laterally or side by side co-joined by a single hinge pin. Further, to insure appropriate alignment, a tubular roller bushing co-joins the male or the female hinge straps.

Abstract: A roller hinge assembly for connecting articulating door panels and simultaneously supporting a laterally extending panel support roller assembly includes one or more hinge units each having a male hinge strap and a female hinge strap. The structural integrity of one or more of the hinge units is supplemented by a reinforcing, slotted tubular member fitted over the roller axle support bushing which extends between and simultaneously engages opposed, spaced hinge strap arms. Two or more such hinge units may be arrayed laterally or side by side co-joined by a single hinge pin. Further, to insure appropriate alignment, a single tubular roller bushing may co-join the male or the female hinge units.

Abstract: A door strut construction includes a strut having a top cross wall connecting lateral side walls that are part of a truncated isosceles triangle and wherein the lateral cross wall joins first and second spaced pylons attached to the top edge of the side walls and further wherein the bottom edge of the side walls include projecting plate members having upstanding, outside lips for reinforcement. The strut further includes lateral ribs positioned in the upper half region of the side walls to improve torsion resistance.

Abstract: A roller hinge assembly for connecting articulating door panels and simultaneously supporting a laterally extending panel support roller assembly includes one or more hinge units each having a male hinge strap and a female hinge strap. The structural integrity of one or more of the hinge units is supplemented by a reinforcing, slotted tubular member fitted over the roller axle support bushing which extends between and simultaneously engages opposed, spaced hinge strap arms. Two or more such hinge units may be arrayed laterally or side by side co-joined by a single hinge pin. Further, to insure appropriate alignment, a single tubular roller bushing may co-join the male or the female hinge units.

Abstract: A roller hinge assembly for connecting articulating door panels and simultaneously supporting a laterally extending panel support roller assembly includes multiple uniformly sized hinges having a male hinge strap and a female strap. Two or more such uniformly sized hinge units are arrayed laterally or side by side co-joined by a single hinge pin. Further, to insure appropriate alignment, a tubular roller bushing co-joins the male or the female hinge straps.

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.