| 摘要 |
A carrier having wheels at the rear thereof is moved to a selected location on a surface by means of a system which includes a centering deck supported on said surface for movement in any direction thereon and a notched centering member fixedly positioned on one side of said centering deck. The centering member is spaced above the aforesaid surface, and a pin depending from the rear of the carrier engages one wall of the notch in the centering member as the wheels of the carrier roll across the centering deck toward the centering member. Springs are arranged to resiliently bias the centering deck into a desired alignment relative to the centering member, and ramps are fixedly positioned on opposite sides of the latter to lift the rear of the carrier as it rolls across the centering deck. Centering plates are located on the aforesaid surface at a predetermined distance from the centering deck and supports are mounted on the forward end of the carrier, the lower ends of said supports moving to the centers of the centering plates when supported on the sloped upper surfaces of the latter.
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