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Trailer and trailer unloading system
| Details |
Inventors: Fenton, E. Dale;
Assignee:
Primary Examiner: Werner; Frank E.
Assistant Examiner:
Attorney, Agent or Firm: Kinney; Richard G.
A trailer and method for unloading onto the ground or like surface using an unarticulated frame and no power sources other than the tractor or prime mover. The frame supports three rows of overlapping transverse rollers and has a tail-end roller substantially across its width. A wheeled carriage is mounted to the underside of the frame, so that it can be longitudinally shifted. When mounted on a conventional "fifth wheel" connection to the tractor, shifting of the carriage forward lowers the tail end of the frame which pivots downward about the connection to the trailer. Shifting the carriage back raises the tail. A pair of ground rollers is provided at the tail of the trailer which contacts the ground as it is lowered. A load may be placed onto the ground by unlocking the carriage, applying the brakes to the wheels of the carriage and backing up the tractor-trailer. When the trailer end is lowered so that the ground rollers are on the ground, the trailer is stopped, the load is unstrapped, and the tractor trailer driven forward, out from under the load which is thus placed on the ground. Thereafter, by applying the carriage brakes again while driving the rig forward, the frame is returned to its raised tail position, the carriage relocked, and the unloaded rig can be driven on the road. |
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DETAILED DESCRIPTION An elongated roller trailer constructed in accordance with the present invention has a framework including four longitudinal support members, two main members on either side of the longitudinal center line of the trailer and two secondary members at the sides of the trailer.
A carriage having ground contacting wheels is mounted to the main supports and the framework includes means, such as a "fifth wheel" connection, for being attached to a tractor.
The load is carried by a plurality of transverse rollers which are arranged in a pattern and are end mounted on the support members such that the rollers' upper surfaces are approximately in a plane for receiving the trailer's load.
The patterned rollers are relatively short, spanning between adjacent longitudinal supports on which they are mounted.
The pattern consists of a longitudinally repeated progression of a roller between the main supports spaced from a pair of rollers, one of which extends between the main and secondary supports on one side of the center line and the other of which extends between the main and secondary supports on the other side.
Other features and advantages of the invention will become clear from the following description and claims.
The invention, together with the advantages thereof, may best be understood by reference to the following description taken in connection with the accompanying drawings, in the several figures of which, like reference numerals identify like elements.
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