Patents Assigned to Industrial Door Company, Inc.
  • Apparatus for winding a spring
    Patent number: 6615897
    Abstract: 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 configured to be coupled via a connector to one end of the spring, while the other end of the spring is fixed to the shaft. Rotation of the transmission results in a turning of the connector and a winding and/or elongation of the spring.
    Type: Grant
    Filed: June 10, 2002
    Date of Patent: September 9, 2003
    Assignee: Industrial Door Company, Inc.
    Inventor: Edward Dorma
  • Counterbalancing apparatus for roll-up door
    Patent number: 6408925
    Abstract: 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 winding of the spring. A worm gear box operates to wind the elongated spring and retain the spring in the wound position to continuously apply torsion force to a shaft operatively connected to the door the counterbalance the door.
    Type: Grant
    Filed: July 27, 1999
    Date of Patent: June 25, 2002
    Assignee: Industrial Door Company, Inc.
    Inventor: Edward Dorma