Self-contained demountable dump bed

Claim 1

A demountable dump bed for truck vehicles having fixed boxtype load bodies, comprising; a support frame comprising a pair of rectilinear rails and a plurality of transverse cross-ties; a tilt body pivotally mounted at its rearwardmost terminal end to the rearwardmost terminal end of said support frame, said tilt body comprising a bottom wall, a front wall issuing upwardly from the rearwardmost terminal end of said bottom wall, a pair of side walls issuing upwardly from the terminal side of said bottom wall and a tailgate pivotally mounted at its uppermost terminal end to the upwardmost rearwardmost terminal ends of said side walls and meeting with said bottom wall; and a lift assembly including lift scissors including a first lever pivotally mounted at one of its terminal ends and disposed rectilinearly with respect to said bottom wall, and a second lever pivotally mounted at one of its terminal ends to the free terminal end of said first lever and being connected by its terminal end opposite that connected to said first lever to a transverse cross-tie disposed centrally in said support frame, including a pressure cylinder pivotally connected at its base to said cross-tie having said lift scissors and being pivotally mounted at its piston head centrally in said first lever, and including a pressure pump mounted at the forwardmost terminal end of said support frame being accommodated by suitable configuration of said tilt body, said hydraulic pump having a valve detachably engageable with said truck box to control said cylinder.