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Spring loaded swinging door system

  • US 6,006,475 A
  • Filed: 03/04/1998
  • Issued: 12/28/1999
  • Est. Priority Date: 03/04/1998
  • Status: Expired due to Fees
First Claim
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1. A spring apparatus for use with a swinging door closure system, the system used to move the door between first and second door positions, the system including a motor having a rotor shaft, a gear housing and a plurality of gears forming a gear train positioned within the housing, the train having a last gear at a distal end and N other gears including a first gear at a proximal end opposite the distal end and in operative communication with the rotor shaft, each gear centered along a gear axis for rotation, a drive shaft extending from the last gear, an arm member linked to the drive shaft at a proximal end and to the door at a distal end, the apparatus positionable in at least a first orientation with respect to the closure system, when power is provided to the motor to drive the rotor in a first direction the gears rotate such that the drive shaft and arm force the door from the first to the second position, when the apparatus is in the first orientation, the apparatus for forcing the door from the second back into the first position when power is cut off to the motor, the apparatus comprising:

  • a stopper securable in a fixed position with respect to the gear housing; and

    a torsional spring arranged about an Mth gear axis having central and lateral spring ends, a first of the spring ends linked to the Mth gear and a second of the spring ends linked to the stopper, the Mth gear being one of the N gears;

    whereby, when the apparatus is in the first orientation the spring is wound about the Mth gear axis from the first to the second ends such that the spring is compressed when power is provided to the motor to drive the rotor in the first direction and the spring expands thereby forcing the door back into the first position when power is cut off from the motor.

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