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Counterbalancing mechanism for an overhead door

  • US 5,964,268 A
  • Filed: 05/01/1997
  • Issued: 10/12/1999
  • Est. Priority Date: 06/16/1994
  • Status: Expired due to Term
First Claim
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1. An overhead door system, including an overhead door which is operative to open and close a door opening having left and right sides as viewed from inside said overhead door, and counterbalancing apparatus for said overhead door, said apparatus comprising:

  • a) a torsion shaft mounted for rotation between left and right stationary supports respectively mounted adjacent said left and right sides of said overhead door;

    b) a torsion spring having a first end and a second end, said first end fixed to said torsion shaft so as to allow rotation with said torsion shaft;

    c) a winding mechanism connected to one of said left and right stationary supports by respective connecting elements on said one of said left and right stationary supports and said winding mechanism, said winding mechanism further having a ring gear connected to said second end of said torsion spring and a worm engaged with said ring gear, wherein rotation of said worm rotates said ring gear to wind said second end of said torsion spring with respect to said first end, and said counterbalancing apparatus being adapted for connection to said left or right stationary support and being connected to one of said left and right station supports while a drive portion thereof is oriented at a downward angle away from said door at either location.

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