| 摘要 |
Beams (24, 26) are used to guide the rear end of a trailer (T) into contact with bumpers (20, 22) on the rear end of a dock (D). Longitudinal beams (32, 34) include hydraulic cylinders that are operated for extending and retracting the beam (32, 34). The trailer (T) is backed up against sloping surfaces (100) on the beams (32 , 34). Contact between the sloping surfaces (100) and a transverse beam (104) at th e rear end of the trailer (T) cams the beam (104) into a position where hooks (102) on the outer ends of the beams (32, 34) can hook onto a shoulder (106) on the trail er beam (104). The beams (32, 34) are then retracted. This moves the beams (32, 34) upwardly onto supports (78, 80), raising the trailer beam (104) a proper height. Continued retraction of the beams (32, 34) pulls the trailer beam (104) into contact with bumpers (20, 22) on opposite sides of the rear end of the dock (D). The trailer (T) is aligned with the dock (D) and the hooks (102) hold the trailer (T) in to a coupled position with the dock (D).
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