| 摘要 |
The Ross Dolly Trolley is a modified hand truck or furniture cart. It is modified by adding four keel or thimble wheels (guide wheels) to the inside of the frame that will allow it to track the rails of an extension ladder. A pivot pin is inserted through the step of the ladder and tied down. It can then be used in conjunction with block and tackle to load and unload items into or out of a pickup truck, or other cargo vehicles. An extension ladder is pivotally mounted on a cargo bed of a truck, by inserting a pin through a step of the ladder. Each side of the pin is then strapped to the truck. A pulley system (block and tackle) is hooked to the top of the ladder as well as the loaded dolly, by pulling a rope through the pulleys, the dolly trolley will climb the ladder when it reaches a certain point the ladder will pivot, depositing the loaded dolly trolley into the truck.
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