| 摘要 |
A hydraulic device for the lifting and lowering of a mobile home or trailer on a towing truck containing a hitching ball is provided. The hitching bar is permanently affixed to a vertical steel casing in which is contained and affixed a hydraulic cylinder. A piston is contained within said cylinder and is affixed to a piston rod which is permanently connected to a plate made integral with the towing vehicle. Hydraulic fluid is injected into the chamber of the cylinder above the piston for raising of the hitching ball and is injected in the bottom chamber of the cylinder for lowering of the hitching ball. The piston and rod do not move. The cylinder and casing and hitching ball move with injection of the hydraulic fluid.
|
