Hydraulic dump box

Claim 1

A dumping apparatus comprising: a support base, an upright frame mounted near one edge of and on said base and extending upwardly therefrom, pivot means defining a base pivot axis and connecting said frame with said base for swinging movement of said frame about said base pivot axis from a first position above the base to an outwardly tilted position with respect to said base, cooperating means on said frame and base for limiting the permissible displacement of said frame to between said first and tilted positions, but permitting free movement between such positions, an open-topped, upright container having an upright wall forming a dumping side, said container located on said base adjacent to the frame when said frame is in said first position, arm means extending laterally from the upper end of said dumping side, pivot means connecting the outer end of said arm means with the upper end of said frame and defining a frame pivot axis located well above the base pivot axis, and extensible and retractable thrust means connected between said base and said container, said thrust means operable during the first phase of extension thereof to tilt the frame to said tilted position with the container resting thereon in a similarly tilted attitude aNd during a second phase to rotate the container about the frame pivot axis while the frame is in said tilted position, to a dumping position for the container.