| 摘要 |
<p>A wheel cradling assembly includes a self-locking and self-unlocking actuator assembly associated with each of four dolly wheels (120-1,2,3,4), each actuator assembly having a roll-over pivot gear (415, 715) for moving an associated dolly wheel spindle (301, 302) between released and actuated position. A gear lock (423, 723) either allows or prohibits rotational motion of the roll-over pivot gear (415, 715) in accordance with the gear lock's pivotable position, and a spindle retainer (421, 721) automatically engages and releasably locks the dolly wheel spindle (301, 302) whenever the spindle is moved to the actuated position by the gear. The dolly assembly also includes a pair of cross arm assemblies (140-1, 140-2) extending transversely between a pair of dolly wheel carrying base assemblies (130) for surrounding a pair of coaxial wheels (150) of a towed vehicle.</p> |
