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US 10,919,554 B1Granted
Three-wheel cargo cart with adjustable handle height
OwnerMilton James Vaverekinventor
Life of this patent
Estimating the term…
Abstract
A hand propelled three wheeled cart for transporting miscellaneous cargo. The basic cart has a single front wheel with two solid rear supports, such as a standard wheelbarrow. The two rear wheels are attached to a lever that is pivotally connected to the lever mounting support brackets. Lifting the handles pries the two rear wheels, into position, elevating the rear cart support legs off the ground. This cam action reduces the operators lifting effort and improves the lateral stability of the cart. Releasing the handles automatically anchors the cart.
Claims21
A three-wheeled cargo cart
- comprising a tub;
- a right side tub rear support;
- a
- left side tub rear support;
- a first front wheel configured to rotate on a first front wheel axle;
- a right side tub lifting handle having a proximal end, and a distal end supported by the first front wheel axle;
- a left side tub lifting handle having a proximal end, and a distal end supported by the first front wheel axle;
- a right side lever and wheel assembly comprising
- a lever having a proximal end and a distal end and a pivot point provided between the proximal end and the distal end,
- a lever handle provided on the proximal end of the lever, and
- a right side rear wheel configured to rotate in proximity to the distal end of the lever;
- a left side lever and wheel assembly comprising
- a lever having a proximal end and a distal end and a pivot point provided between the proximal end and the distal end,
- a lever handle provided on the proximal end of the lever, and
- a left side rear wheel configured to rotate in proximity to the distal end of the lever;
- a right hand pivot bracket attached to the tub or attached to the right lifting handle in proximity to the proximal end of the right lifting handle, the right hand pivot bracket comprising
- a plurality of adjustment notches, and
- a right lever stop cam;
- a left hand pivot bracket attached to the tub or attached to the right lifting handle in proximity to the proximal end of the right lifting handle, the right hand pivot bracket comprising
- a plurality of adjustment notches, and a
- left lever stop cam;
- and
- a crossmember shaft comprising
- a right end portion pivotally attached to the right side lever pivot point and to the right hand pivot bracket thereby permitting the right side lever to pivot relative to the right hand pivot bracket, so that as the right side handle is raised, the right rear wheel is lowered, and as the right side handle is lowered, the right rear wheel is raised, and
- a left end portion pivotally attached to the left side lever pivot point and to the left hand pivot bracket thereby permitting the left side lever to pivot relative to the left hand pivot bracket, so that as the left side handle is raised, the left rear wheel is lowered, and as the left side handle is lowered, the left rear wheel is raised.
22 more elements
A method of adjusting a three-wheeled cargo cart to minimize the downward travel of the handles, the method comprising
- providing a three wheel cart comprising a
- tub;
- a right side tub rear support;
- a
- left side tub rear support;
- a first front wheel configured to rotate on a first front wheel axle;
- a right side tub lifting handle having a proximal end, and a distal end supported by the first front wheel axle;
- a left side tub lifting handle having a proximal end, and a distal end supported by the first front wheel axle;
- a right side lever and wheel assembly comprising
- a lever having a proximal end and a distal end and a pivot point provided between the proximal end and the distal end,
- a lever handle provided on the proximal end of the lever, and
- a right side rear wheel configured to rotate in proximity to the distal end of the lever;
- a left side lever and wheel assembly comprising
- a lever having a proximal end and a distal end and a pivot point provided between the proximal end and the distal end,
- a lever handle provided on the proximal end of the lever, and
- a left side rear wheel configured to rotate in proximity to the distal end of the lever;
- a right hand pivot bracket attached to the tub or attached to the right lifting handle in proximity to the proximal end of the right lifting handle, the right hand pivot bracket comprising
- a plurality of adjustment notches, and
- a right lever stop cam;
- a left hand pivot bracket attached to the tub or attached to the right lifting handle in proximity to the proximal end of the right lifting handle, the right hand pivot bracket comprising
- a plurality of adjustment notches, and a
- left lever stop cam;
- and
- a crossmember shaft comprising
- a right end portion pivotally attached to the right side lever pivot point and to the right hand pivot bracket thereby permitting the right side lever to pivot relative to the right hand pivot bracket, so that as the right side handle is raised, the right rear wheel is lowered, and as the right side handle is lowered, the right rear wheel is raised, and
- a left end portion pivotally attached to the left side lever pivot point and to the left hand pivot bracket thereby permitting the left side lever to pivot relative to the left hand pivot bracket, so that as the left side handle is raised, the left rear wheel is lowered, and as the left side handle is lowered, the left rear wheel is raised;
- and
- a stop cross bar comprising
- a right end insertable into a selected adjustment notch of the plurality of adjustment notches in the right hand pivot bracket, and
- a left end insertable into a selected adjustment notch of the plurality of adjustment notches in the left hand pivot bracket;
- and
- adjusting the right lever stop cam and the left lever stop cam by
- with the cart parked on a flat surface, articulating the right lever and the left lever so that the right wheel and left wheel are resting on the surface,
- rotating the right lever stop cam and the left lever stop cam until they touch the right lever and left lever, respectively, and
- securing right lever stop cam and the left lever stop cam.
32 more elements
A wheelbarrow conversion kit, for converting a wheelbarrow comprising a tub, a frontwheel, a right and a left rear support, a right support arm, and a left support arm, the wheelbarrow conversion kit comprising
- a right side lever and wheel assembly comprising
- a lever having a proximal end and a distal end and a pivot point provided between the proximal end and the distal end,
- a lever handle provided on the proximal end of the lever, and
- a right side rear wheel configured to rotate in proximity to the distal end of the lever;
- a left side lever and wheel assembly comprising
- a lever having a proximal end and a distal end and a pivot point provided between the proximal end and the distal end,
- a lever handle provided on the proximal end of the lever, and
- a left side rear wheel configured to rotate in proximity to the distal end of the lever;
- a right hand pivot bracket attached to the tub or attached to the right lifting handle in proximity to the proximal end of the right lifting handle, the right hand pivot bracket comprising
- a plurality of adjustment notches, and
- a right lever stop cam;
- a left hand pivot bracket attached to the tub or attached to the right lifting handle in proximity to the proximal end of the right lifting handle, the right hand pivot bracket comprising
- a plurality of adjustment notches, and a
- left lever stop cam;
- and
- a crossmember shaft comprising
- a right end portion pivotally attached to the right side lever pivot point and to the right hand pivot bracket thereby permitting the right side lever to pivot relative to the right hand pivot bracket, so that as the right side handle is raised, the right rear wheel is lowered, and as the right side handle is lowered, the right rear wheel is raised, and
- a left end portion pivotally attached to the left side lever pivot point and to the left hand pivot bracket thereby permitting the left side lever to pivot relative to the left hand pivot bracket, so that as the left side handle is raised, the left rear wheel is lowered, and as the left side handle is lowered, the left rear wheel is raised.
15 more elements
Dependencies are inferred from the claim text.