Importance

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Abstract

A trailer has a trailer body, pairs of rear wheels at opposite sides of the trailer and hydraulics for tilting the forward end of the trailer body upwardly to dump the load in such body. The trailer dumps the load in a retracted position of the wheels. To increase the load which such body can carry while travelling, the rear wheels of the trailer are movable to extended positions. To provide for the extension and retraction of the rear wheels and facilitate the dumping of the load, a member is attached at a first end to leaf springs between the wheels and at a second end to the trailer. At an intermediate position, the member is attached to a rod extensible and retractible relative to a hydraulic cylinder to extend or retract the first end of the member and the wheels about the attachment at the second end as a fulcrum. The cylinder is attached to the trailer forwardly of the attachment of the member to the trailer at the second end. The member is initially pivotable about the first end as a fulcrum when the forward end of the trailer is tilted upwardly. The member subsequently engages the axle of the rearmost wheel during such upward tilting to provide for the pivotal movement of the member of such axle and for a support of the rear end of the trailer body during such tilting. The cylinder and rod are included in a hydraulic circuit with valve members to provide for a controlled extension and retraction of the rear wheels.

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First Claim