Vehicle liftgate counter balance system

Details Vehicle liftgate counter balance system Vehicle liftgate counter balance system

1998-06-26

2000-02-01

Redman, Jerry

Movable or removable closures

With means mounting closure for swinging

With biasing means

296 56, E05F 110

Patent

active

060189126

ABSTRACT:
The counter balance system for a vehicle liftgate includes a pair of gas cylinders in combination with a torsion rod. The gas cylinders urge the liftgate toward an open position but due to a short moment arm do not exert sufficient force to open the liftgate until the liftgate has pivoted about one third of the distance from the closed position toward the open position. The torsion rod also urges the liftgate toward an open position. Maximum force is exerted by the torsion rod when the liftgate is closed. As the liftgate moves toward an open position, the force exerted by the torsion rod decreases until the liftgate is midway between closed and open. The torque rod does not exert any force on the liftgate during the last portion of its movement to an open position.

REFERENCES:
patent: 2195426 (1940-04-01), Ronning
patent: 3422572 (1969-01-01), Pollak
patent: 3438152 (1969-04-01), Cadiou
patent: 3490756 (1970-01-01), Spier
patent: 3516210 (1970-06-01), Jentoft et al.
patent: 3713472 (1973-01-01), Dozois
patent: 4133074 (1979-01-01), Schack
patent: 4739585 (1988-04-01), Pickles
patent: 4851742 (1989-07-01), Chapman
patent: 5448856 (1995-09-01), Moore et al.
patent: 5531498 (1996-07-01), Kowall
patent: 5588258 (1996-12-01), Wright et al.
patent: 5787549 (1998-08-01), Soderland

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