초록 ▼

A ramp assembly for trailers which includes a pair of elongated, parallel ramp plates reciprocably supported in tracks under the bed of a trailer. An arresting cam assembly is mounted on the rear of the trailer, and includes a control handle which is connected to, and rotates, a cam rod which carrie

A ramp assembly for trailers which includes a pair of elongated, parallel ramp plates reciprocably supported in tracks under the bed of a trailer. An arresting cam assembly is mounted on the rear of the trailer, and includes a control handle which is connected to, and rotates, a cam rod which carries, and is keyed to, a plurality of spaced cam plates. These cam plates are rotated with the cam rod to bring the lobes of the cam plates against the ramp plates, forcing them into a locked status against the underside of the bed of the trailer. In another rotational position of the cam plates, the ramp plates can be pulled horizontally outwardly from the trailer bed to an inclined loading position, but a cusp on each of the cam plates functions to engage the ramp plates and prevent them from being pulled completely free of the trailer bed.

대표청구항 ▼

In combination with a trailer having an elongated, substantially flat, generally horizontally extending bed supported by a pair of wheels, an improved ramp assembly comprising: a plurality of elongated tracks mounted on the trailer at a location beneath said bed; at least one ramp plate subassembly

In combination with a trailer having an elongated, substantially flat, generally horizontally extending bed supported by a pair of wheels, an improved ramp assembly comprising: a plurality of elongated tracks mounted on the trailer at a location beneath said bed; at least one ramp plate subassembly mounted on a plurality of said tracks for horizontal movement therealong in the direction of movement of said trailer on said wheels between a transport position beneath said bed and a loading position extending rearwardly and downwardly from said bed; and a cam assembly mounted at one end of the tracks on said trailer and including: an elongated, horizontal cam rod projecting transversely across said tracks; bearings supporting the cam rod for rotation about its horizontal longitudinal axis; and a plurality of cam plates secured to said cam rod for rotation therewith and spaced axially from each other along the cam rod, at least one of said cam plates being positioned adjacent each of said ramp plate subassemblies, and each of said cam plates including: a cam lobe configured and positioned to contact a respective one of said ramp plate subassemblies and to bias it upwardly to a locked position against the underside of said bed in both said loading position and said transport position when said cam rod is rotated about its longitudinal axis to a first position, whereby in said upwardly biased locked position, said respective one of said ramp plate subassemblies contacted by said cam lobe is prevented form moving upwardly or rearwardly by the cooperative engagement of said cam lobe and bed when said respective one of said ramp plate subassemblies is in its locked position; and a portion configured and positioned to engage a portion of said respective one ram plate subassembly to limit movement of said respective one ramp plate subassembly in a rearward direction when said cam rod is rotated about its longitudinal axis to a second position.