Implements or apparatus for applying pushing or pulling force – Vehicle attached jack – Attached to trailer tongue
Patent
1989-05-10
1990-12-18
Hartman, J. J.
Implements or apparatus for applying pushing or pulling force
Vehicle attached jack
Attached to trailer tongue
254 97, 254427, B60S 902
Patent
active
049781049
ABSTRACT:
A quick-release rack and pinion safety jack assembly for mounting upon the tongue of a conventional trailer. The jack assembly comprises a vertical support stanchion extending upwardly from a rotatable caster, a rigid rack, and a weatherproof box-like gear housing penetrated by the stanchion. A rotatable hand crank is rotated to move the stanchion relative to the gear housing, to elevate or lower the trailer. The internal gear assembly comprises a worm gear driven by the hand crank and a drive gear driven by the worm which selectively meshes or unmeshes with the rack. The drive gear is mounted for rotation upon a rigid axle which penetrates elongated follower slots defined in opposite walls of the gear housing. The drive gear axle is coupled at its ends by rigid links rotatably anchored in a pivotal safety lever. The safety lever is manually deflectable along an arcuate path between a first lock position and a second released position. As the lever is deflected downwardly from its "locked" position, the drive gear moves horizontally along the worm out of engagement with the rack. When the lever is returned to its lock position, the drive gear rotates along the worm gear and then meshes with the rack. When the drive gear is unmeshed from the rack, the stanchion slides freely relative to the housing for height adjustments without cranking.
REFERENCES:
patent: 968223 (1910-08-01), Willour
patent: 1324721 (1919-12-01), Benedict
patent: 3921958 (1975-11-01), Brockelsby et al.
patent: 3934852 (1976-01-01), Weber et al.
patent: 4702458 (1987-10-01), Kendrick
patent: 4848735 (1989-07-01), Pittman
Carver Stephen D.
Hartman J. J.
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