| 摘要 |
A self-propelled trailer maneuvering dolly for transporting a fifth wheel trailer or a travel trailer. The dolly has a frame, a front handlebar and castor for steering, a pair of rear drive wheels for driving the dolly, a pneumatic motor, and sprocket wheels and chains for transmitting power to the drive wheels. There is a pneumatically extensible and retractable vertical lift, which has a top for engaging with the coupling member of a fifth wheel trailer and it also has a hitch ball for hitching up to a convention travel trailer. A spring biased lift bracket below the frame keeps the drive wheels off the ground when the trailer is empty so that the operator can easily maneuver the dolly into position below the coupling member of a fifth wheel to be moved. A lever supplies pressurized air to the lift, which in turn raises the front end of the fifth wheel trailer. The weight of the trailer is centered on the dolly and also keeps the drive wheels on the ground. Another lever supplies pressurized air to slowly turn the drive wheels. The operator guides the dolly with the front handlebar. When transporting a travel trailer, the ball hitch is aligned with the tongue of the trailer to be moved. The two are fastened together, and the lift is raised to elevate the front end of the travel trailer off the ground. The operator can then maneuver the trailer to its new position.
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