| 摘要 |
A more or less conventional back and forth shiftable spray and rotary brush assembly is provided for movement back and forth along the external surfaces of a trailer body to be washed and includes opposite side portions from which inwardly projectable and outwardly retractable wheel washing brushes are supported. This component of the invention is utilized to wash the exterior of a trailer body. The invention further includes an elongated extendable boom structure having a base and free ends. A carriage is provided from which the boom is supported in horizontal position with the base end of the boom supported from the carriage and the free end of the boom extendable relative to the carriage. The carriage is shiftable back and forth along a horizontal path extending transversely of the boom and may be moved into registry behind a trailer from a position disposed along one side of the trailer after the latter has been moved forwardly to a position just forwardly of the back and forth path of movement of the carriage. When the carriage is moved into position in alignment with the rear of a trailer having been moved into washing position, the free end of the boom, which carries a washing head assembly, is extended relative to the base end of the boom and the carriage into the rear of the trailer and forwardly through the interior of the trailer. The washing head assembly is operative to thoroughly wash and rinse the interior of the trailer during its forward movement through the interior thereof and its rearward movement therethrough upon retraction of the boom.
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