Double cylinder tilt recovery system
OwnerRoger D. Kooimainventor
Life of this patent
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Abstract
The current invention is a portable wheel lift device for lifting and towing vehicles comprising a boom which pivots up and down for connecting to and raising a portion of a vehicle which is to be towed. The invention comprises a mounting frame adapted to be attached to a towing vehicle and a two-stage cylinder assembly operatively connected to the mounting frame and the boom for tilting the pivoting boom relative to the mounting frame.
Claims16
A towing device for attachment to a towing vehicle for lifting and towing a towed vehicle, comprising:
- an attachment assembly adapted to be mounted to the towing vehicle;
- a boom assembly having a longitudinal boom axis and being pivotally connected to the attachment assembly for pivotal movement about a first pivotal axis from a lowered position wherein the longitudinal boom axis extends away from the attachment assembly to a stowed position wherein the boom axis is upstanding;
- a two stage fluid cylinder connected to the attachment assembly and comprising a large cylinder, a large piston movable in the large cylinder from a retracted position to an extended position, a small cylinder rigidly attached to the large piston, a small piston movable within the small cylinder from a retracted position to an extended position;
- the small piston being connected to the boom assembly at a second pivotal axis;
- the large piston exerting more force and being slower than the small piston.
A towing device for attachment to a towing vehicle for lifting and towing a towed vehicle, comprising:
- an attachment assembly adapted to be mounted to the towing vehicle;
- a boom assembly having a longitudinal boom axis and being pivotally connected to the attachment assembly about a first pivotal axis for pivotal movement from a lowered position wherein the longitudinal boom axis extends away from the attachment assembly to a stowed position wherein the boom axis is upstanding;
- a two stage fluid cylinder connected to the attachment assembly and comprising a large cylinder, a large piston movable in the large cylinder from a retracted position to an extended position, a small cylinder, a small piston movable within the small cylinder from a retracted position to an extended position;
- a pushing rod pivotally connected to the small piston for pivotal movement about a second pivotal axis and pivotally connected to the boom assembly for pivotal movement about the first axis;
- the large piston exerting more force and being slower than the small piston.
A towing device for attachment to a towing vehicle for lifting and towing a towed vehicle, comprising:
- an attachment assembly adapted to be mounted to the towing vehicle;
- a boom assembly having a longitudinal boom axis and being pivotally connected to the attachment assembly about a first pivotal axis for pivotal movement from a lowered position wherein the longitudinal boom axis extends away from the attachment assembly to a stowed position wherein the boom axis is upstanding;
- a two stage fluid cylinder connected to the attachment assembly and comprising a large cylinder, a large piston movable in the large cylinder from a retracted position to an extended position, a small cylinder, a small piston movable within the small cylinder from a retracted position to an extended position;
- a pushing rod pivotally interconnecting the small piston to the boom assembly;
- the large piston and the small piston extending along the same longitudinal axis;
- a roller pivotally mounted to the small piston;
- a track guiding the roller;
- the large piston exerting more force and being slower than the small piston.
Dependencies are inferred from the claim text.