| 摘要 |
<p>The ramp (2) is for use in loading/unloading a pick-up truck. The ramp is foldable about a central hinge (5). When folded, a pair of the ramps constitute the tailgate of the truck. When unfolded, the ramp is 3 m long by 25 cm wide by 6 cm deep, has a load capacity in excess of that of the truck, and is light enough to be manhandled easily by one person. The ramp is made from extruded aluminum sections: in one embodiment, extruded channels (7) are welded lengthwise to a platform (6); in another, the ramp is a one-piece extrusion. The cross-section of the ramp includes upper and lower flanges, held together with four webs (10; 81).</p> |
