| 摘要 |
A system for loading and unloading a vehicle, including: a vehicle actuated wheel chock positioning device (10) for at least one tir e (T2) of such a vehicle which is rotatable on a treadway (S) between an initi al position (A) and a plurality of operating positions ( A, B) the chock positioning device (10) including a mechanism (15) engageable by such tire (T2) at the initial position (A) and movable with t he tire (T2) as it rolls on the treadway (S), a chock (16) positionable behind the tire (T2) when the mechanism (15) is in any of the o perating positions (A, B) in response to engagement of the mechanism (15) by the roll ing tire (T2), and a lock (30) capable of selectively lo cking the chock (16) in a chock position behind the tire corresponding to one of t he operating positions (A, B), the system, in one prefer red embodiment further including a leveling ramp (20) carrying the chock positio ning device (10) with means (26) to vertically position the device (10) and a vehicle chocked thereby to a selectable vertical position.
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