초록 ▼

A modular cart comprises a load carrying frame and a wheeled carriage supporting the load-carrying frame. The carriage includes a front carriage assembly pivotally coupled to a front of the frame and a rear carriage assembly pivotally coupled to a rear of the frame. The front and the rear carriage a

A modular cart comprises a load carrying frame and a wheeled carriage supporting the load-carrying frame. The carriage includes a front carriage assembly pivotally coupled to a front of the frame and a rear carriage assembly pivotally coupled to a rear of the frame. The front and the rear carriage assemblies are substantially identical. Each carriage assembly comprises an axle pivotally coupled at a vertical midpoint axis to the load-carrying frame. The axle is pivotal about the vertical midpoint axis and is selectable between a first position pivotally fixed with respect to the load carrying frame and a second position freely pivotal about the axis. A caster wheel assembly is attached to each of the ends of the axle. The caster wheel assembly is pivotal about a vertical end axis and is selectable between a third position pivotally fixed with respect to the axle and a fourth position freely pivotal about the vertical end axis.

대표청구항 ▼

1. A modular cart, said cart comprising:a load carrying frame; and a wheeled carriage supporting said load carrying frame; said carriage including a front carriage assembly pivotally coupled to a front of said frame and a rear carriage assembly coupled to a rear of said frame; said front carriage as

1. A modular cart, said cart comprising:a load carrying frame; and a wheeled carriage supporting said load carrying frame; said carriage including a front carriage assembly pivotally coupled to a front of said frame and a rear carriage assembly coupled to a rear of said frame; said front carriage assembly further comprising an axle pivotally coupled to said load carrying frame, said axle having a first end and a second end; said rear carriage assembly further comprising an axle coupled to said load carrying frame, said axle having a first end and a second end; an extendable axle arm sleeved within each of said axles, and telescopingly movable with respect to each said axle end between a first retracted position and a second extended position; a plurality of rollers on said extendable axle arms, wherein said rollers bear upon a surface of said axle when said extendable axle arm is telescopically moved with respect to said axle end; and, a wheel assembly attached to the end of each extendable axle.