| 摘要 |
<p>A mobile loading dock (10) including a planar ramp member (12) having an underside (30) with a wheel assembly (72). The wheel assembly includes a tension spring (74), hydraulic member (76), a leg (78) hingedly attached to the ramp underside (70) and a wheel attached to the leg. The tension spring exerts a pulling force on the leg and wheel and the hydraulic member exerts a pushing force. The combined forces are directionally disposed to erect the wheel assembly when the lower end of the mobile loading dock is raised from a resting position in contact with the ground surface (84) to a mobile position.</p> |
