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US 2007/0183877 A1Published application
Cargo door/ramp lift assist system
AssigneeDesigned Components, LLC
InventorMichael Lambright
Life of this patent
Estimating the term…
Abstract
A lift assist system for cargo door ramps of trucks and trailers which includes one or more torsion arms that are housed in a tubular housing assembly attached at the pivotal axis of the door ramps. The housing assembly includes left and right door hinges and at least one center door hinge. Tubular housing members which house the torsion bars extend between the door hinges.
Claims20
A lift assist system for a cargo door ramp that comprises:
- at least one torsion bar that has one end fixed against axial rotation relative to the door ramp and an opposite end fixed against axial rotation relative to a structure about which the door ramp pivots between an open and closed position;
- a plurality of door hinges including at least left and right door hinges and at least one center door hinge;
- and
- a tubular housing extending between the door hinges through which the at least one torsion bar extends.
1 more element
A vehicle having a door that pivots adjacent a frame downward into an open position and upward into a closed position in combination with a lift assist system which combination comprises:
- at least one torsion bar that has one end fixed against axial rotation relative to the door ramp and an opposite end fixed against axial rotation relative to a portion of the frame adjacent which the door pivots between the open and closed positions;
- a plurality of door hinges attached to the door, including at least left and right door hinges and at least one center door hinge;
- and
- a tubular housing extending between the door hinges through which the at least one torsion bar extends, the tubular housing being attached to the frame.
1 more element
Dependencies are inferred from the claim text.