| 摘要 |
A movable ramp is disclosed having a base having a channel therealong, and an upright member extending upwardly from the base. The upright member has a plurality of hooks at differing elevations above the base. A plurality of protrusions extend from a first end of a runway and rest on a hook of the upright member to elevate the first end of the runway above the base. Another protrusion extends outwardly from the runway and slides within the channel of the base to facilitate movement of the first end of the runway relative to the base. In another embodiment, a base has a first end; a frame is fixed to the first end and extends upwardly therefrom. A runway is fixed at its trailing edge to the base. A winch is fixed between the frame and the leading edge of the runway for moving the runway.
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