초록 ▼

A handcart having two wheel assemblies rotably mounted to a fixed axle and two adjustable secondary wheel assemblies rotably mounted to the distal ends of two parallel and spaced apart legs pivotally mounted at their other ends to the handcart frame members. The plate is mounted to a fixed location

A handcart having two wheel assemblies rotably mounted to a fixed axle and two adjustable secondary wheel assemblies rotably mounted to the distal ends of two parallel and spaced apart legs pivotally mounted at their other ends to the handcart frame members. The plate is mounted to a fixed location on the frame and the pivoting legs include elongated slots that receive inwardly extending pivoting axles perpendicularly mounted to the pivoting legs. The pivoting legs are releasably adjusted at one of a plurality of angular positions with a positioning mechanism on each of the pivoting legs that includes a curved plate with indentations.

대표청구항 ▼

The invention claimed is: 1. A handcart, comprising: A) first and second elongated bars and each having first and second ends kept at a parallel and spaced apart relationship with respect to each other by first and second spacer members that are parallel and separated from each other, and including

The invention claimed is: 1. A handcart, comprising: A) first and second elongated bars and each having first and second ends kept at a parallel and spaced apart relationship with respect to each other by first and second spacer members that are parallel and separated from each other, and including a first pair of parallel and spaced apart wheel assemblies rotably mounted over first and second axles that are in turn outwardly mounted to said first ends and said first and second elongated bars further including first and second inwardly extending pivoting axles, respectively, at a first predetermined distance from said first ends; B) third and fourth elongated bars, each having first and second ends, said first ends of said third and fourth elongated bars being pivotally mounted to said pivoting axles, said third and fourth elongated bars each including a slot extending a second predetermined longitudinal distance and positioned at a third predetermined distance from said first ends of said third and fourth elongated bars, and each of said third and fourth elongated bar members also including an outwardly and perpendicularly mounted stopper pin at a fourth predetermined distance from said first ends of said third and fourth elongated bars and further including a third spacer member mounted between said third and fourth elongated bar members at a fourth predetermined distance from said first ends of said third and fourth elongated bars a second pair of parallel and spaced apart wheel assemblies rotably mounted over a third axle that in turn is mounted to said second ends of said third and fourth elongated bars; C) means for selectively adjusting the angular position of said third and fourth elongated bars with respect to said first and second elongated bars, further including first and second curved plates mounted to said first and second elongated bars at said pivoting point and each of said first and second curved plates having a plurality of peripheral indentations that cooperatively coact to receive said pins substantially within said indentations positioned at a predetermined radial distance from said pivoting point; and D) spring means mounted between said pivoting axles and said third spacer member producing a force for urging said third and fourth bar members to lodge said stopper pins within one of said cooperating indentations of each curved plate, thereby keeping said third and fourth bars at a selected angular relationship with respect to said first and second bars. 2. The handcart set forth in claim 1 wherein the length of said slots is approximately twice the diameter of said pins. 3. The handcart set forth in claim 2 wherein the force of said spring means is overcome upon the application of a force of a predetermined magnitude upon said third axle thereby selectively dislodging said stopper pins from said cooperating indentations.