Extension spring system for an overhead door
AssigneeClopay Building Products Company, Inc.
InventorKenneth E. Carper
Life of this patent
Estimating the term…
Abstract
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 the need for multiple installers to lift the full weight of the door and then clamp or otherwise prop the door in an open position. An extension spring containment tube is also provided which surrounds the entire periphery of the spring to fully contain the entire length of the extension spring.
Claims12
An extension spring system for an overhead door system, said mechanism comprising:
- a first mounting bracket;
- a housing having mounting structure for mating with mounting structure on said first mounting bracket;
- a spool carrying a door operating cable, said spool being mounted for rotation within said housing;
- a ring gear connected for rotation with said spool;
- a worm mounted to said housing in intermeshing engagement with said ring gear;
- a second mounting bracket;
- and
- an extension spring connectable between said door operating cable and said second mounting bracket.
An extension spring system for an overhead door, said system comprising:
- an extension spring;
- a support for mounting a first end of said extension spring;
- a door operating cable having a first end for connection to said overhead door and a second end;
- a support bracket;
- a spring tensioning device mounted to said mounting bracket, said spring tensioning device including a cable winding spool receiving the second end of said cable, a rotational mount for said spool and a rotation and locking mechanism operatively connected to said spool and including a drive worm for allowing said spool to be rotated and then effectively locked after winding said cable and stretching said extension spring to a desired spring tension;
- and,
- mounting structure on said housing and said bracket cooperating to enable said housing to be mounted in two selective orientations, one orientation being for mounting said housing on a left side of said overhead door and another orientation being for mounting said housing on a right side of said overhead door, wherein said worm presents an accessible drive portion thereof in each orientation.
Dependencies are inferred from the claim text.