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Apparatus for selective alteration of operating parameters of a door

  • US 5,687,507 A
  • Filed: 09/29/1995
  • Issued: 11/18/1997
  • Est. Priority Date: 07/19/1993
  • Status: Expired due to Fees
First Claim
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1. An apparatus for controlling opening and closing of a door, comprising:

  • (A) a cylinder for guiding a piston linearly along an axis, said piston having a slot and a rack gear formed within said slot, and a pinion gear engages said rack-gear of said piston, said pinion gear being coupled to a connecting arm for moving the door;

    (B) a spring that provides a door closing force, said door closing force urging said piston in a first direction along said axis, wherein said cylinder and said piston form a first fluid chamber, and said door closing force is dampened by a flow of fluid from said first fluid chamber; and

    (C) a rotatable drive screw that provides a door opening force, said door opening force urging said piston in a second direction along said axis, said second direction being opposite said first direction;

    wherein said spring and said rotatable drive screw are positioned on opposite sides of said piston.

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