Matches 1 - 28 out of 28
Match Document Document Title
7343958 Overhead door lift system  
A garage door cable drum is disclosed for a sectional overhead door of a type having a substantially non-linear lift-weight to lift-height characteristic. The drum includes a generally spiral cable...
7254868 winding and anti-drop assembly for door counterbalance system  
A counterbalance system ( 25 ) for a door (D) movable between a closed position and an open position having an axle ( 20 ), a cable drum ( 15 ) attached to the axle, a winding shaft ( 35 )...
7219392 Breakaway track system for an overhead door  
An overhead garage door ( 10 ) includes a plurality of panels ( 11 ) each carrying rollers ( 12 ) which ride in a track assembly ( 15 ). The track assembly ( 15 ) includes a generally vertically...
RE39504 Counterbalance system for upward acting door  
A counterbalance system for an upward-acting door includes spaced-apart wall brackets and cable drums supported on the brackets and connected to flexible cables which depend from the drums and...
6742564 Spring force safety locking system for sectional doors  
Hardware that improves safety and minimizes the risk involved in installing, maintaining, and operating sectional doors that use springs to facilitate door movement. A lock-on side bearing bracket...
6735905 Ratcheting winding cone  
A ratcheting system is used to wind a helical torsion spring around a torsion bar in a counterbalancing mechanism for an overhead door having multiple panel sections. The ratcheting system...
6615897 Apparatus for winding a spring  
An apparatus for winding a spring on a shaft, such as for counterbalancing a roll-up door, includes a housing that carries a transmission which is positionable over the shaft. The transmission is...
6527264 Torsion spring for counter balancing weights particularly in sectional doors  
A torsion spring which is coiled or wound from spring steel wire is provided for counterbalancing weight, particularly in sectional doors. At least one of the two spring ends of the torsion spring...
6527037 Rolling door tensioner  
A rolling door including an axle supported by end brackets, a plurality of drum wheels mounted on the axle, a multi-section door adapted to be selectively rolled and unrolled about the drum wheels,...
6485006 Plug with safety means for use with counterbalancing systems of garage doors and the like  
A plug mounted at one end of a torsional spring operatively connected to an overhead shaft of a counterbalancing mechanism of a garage door, wherein the plug comprises projecting interlocking means...
6408925 Counterbalancing apparatus for roll-up door  
A method and apparatus for counterbalancing a roll-up door uses a conventional coil spring having adjacent coils engaging each other. The spring is elongated to provide for spring growth during the...
6401793 Spring force safety locking system for sectional doors  
Hardware designed to improve safety and minimize the risk involved in installing, maintaining, and operating sectional doors that use spring mechanisms to facilitate door movement. A lock-on side...
6327744 Roll-up door counterbalancing apparatus and method  
The disclosure sets forth an apparatus and method for counterbalancing a roll-up door. A first threaded shaft is concentrically disposed around a torsion shaft and a spring is also disposed around...
6279268 Cable failure device for garage doors and the like  
A cable failure device for a mobilizing a garage door in the event of a failure of one of the cables or one of the elements holding the cables is described. The cable failure device of the...
6263541 Winding cone of an overhead door counterbalancing mechanism and torsion spring winding method therefor  
A method of securing a torsion spring used in a counterbalance system in which the spring torsion cannot be released without first supporting any existing spring torque utilizes a torsion spring...
6155327 Counterbalance system adjustment mechanism for rollup door  
A counterbalance spring adjustment mechanism, particularly adapted for a rollup type upward-acting door which is supported between spaced apart wall brackets on a rotatable shaft. One end of the...
6134835 Counterbalance system for upward acting door  
A counterbalance system for an upward-acting door includes spaced-apart wall brackets and cable drums supported on the brackets and connected to flexible cables which depend from the drums and...
6125582 Spring winder support for door counterbalance system  
A counterbalance system for an upward acting door includes spaced apart wall brackets supporting a tubular shaft for spaced apart cable drums operable to wind counterbalance cables thereon to...
5964268 Counterbalancing mechanism for an overhead door  
An overhead door apparatus utilizing a torsion spring counterbalancing mechanism. The counterbalancing mechanism includes a worm drive ring-shaped gear winding mechanism for setting the appropriate...
5865235 Counterbalance mechanism for vertical opening door  
A counterbalance mechanism for a sectional garage door includes an elongated shaft mounted above the door opening and supporting spaced apart cable drums connected to respective cables which are...
5778490 Tension device for live axle doors  
A live axle tension device (15) that is suitable for adjusting the setting of a spring (16) on a live axle door (10). The tension device comprises a spring (16) that connects to a drum wheel (14)...
5735020 Counterbalance assembly  
The disclosed invention is directed to a torsion spring counterbalance assembly for closures, preferably for aircraft doors, although it is applicable to closures in other environments. The...
5671500 Overhead door spring shield system  
The invention relates to a design for covering and protecting an overhead door spring assembly from the coercive and deteriorating effects caused by the environment that overhead spring assembley's...
5636678 Counterbalancing mechanism for an overhead door  
An overhead door apparatus utilizing a torsion spring counterbalancing mechanism. The counterbalancing mechanism includes a worm drive ring-shaped gear winding mechanism for setting the appropriate...
5632063 Counterbalancing mechanism for an overhead door  
An overhead door apparatus utilizing a torsion spring counterbalancing mechanism. The counterbalancing mechanism includes a worm drive ring-shaped gear winding mechanism for setting the appropriate...
5615723 Extension spring system for an overhead door  
An extension spring overhead door system in which the spring may be quickly and easily placed in tension with the door in a closed position. A spring tensioning device is provided which eliminates...
5577544 Extension spring system for an overhead door  
An extension spring overhead door system in which the spring may be quickly and easily placed in tension with the door in a closed position. A spring tensioning device is provided which eliminates...
5572829 Power operated garage door  
A power operated garage door of the type having a single section movable from a vertical closed position to a horizontal open position at the ceiling of the garage by cables which pull the door...
Matches 1 - 28 out of 28