| 摘要 |
An improved system is provided for hoisting loads from ground level to a truck platform, which has particular advantages on flat bed trucks. Ramps are provided for rolling loaded dollies off a curbing or from the ground onto a lower lift platform position where they are raised by a motor powered hoisting mechanism with the lift platform up to the truck platform. The system is stowed and carried entirely beneath the truck platform so that it does not interfere with its utility or introduce any members above the truck platform. A pivotable lift platform permits storage in a vertically oriented position to prevent the system from extending significantly back of the truck platform. A low powered d-c reversible motor rotates vertical drive screws mating with a drive yoke attached to opposite ends of the lift platform. The lift platform is spring biassed upwardly to aid in lifting loads upwardly to the truck platform with a small motor. A bumper assembly is carried by the system for mounting, license, trailer hitch, lights, etc. Also loading tray extensions are strapped in the lift platform for optional use. The bottom of the lift platform assembly is above ground level and cooperates with a self contained loading ramp which extends to ground or curb level from sides or rear of the lift platform permitting loaded wheeled dollies to be rolled on and lifted to the truck platform.
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