Patent ID: 6530740
Filing Date: 2003-03-11
Classification: B62B

Abstract:
A hand truck with an electrically operated lifting platform, comprising:a frame on both sides of which two guide rails are formed, said frame being provided with a screw shaft vertically supported on the frame to be vertically moved, one or more stabilizing bars forwardly extended from the frame and two wheels rotatably attached to a rear portion of the frame; connecting frame member on top and lower portions of said two guide rails, including vertical rods located outboard of the guide rails and that at an upper portion of each said vertical rods extends a handle; said lifting platform guided by said guide rails and engaged with said screw shaft; a platform moving unit including a first drive motor for providing rotating force, said platform being situated in said lifting platform to allow said lifting platform to be moved selectively upward and downward along the screw shaft by an operation of said first drive motor; a control unit electrically and controllably connected to said first drive motor and a power source; one or more springs, said springs each connecting an upper end of said frame and a rear portion of said lifting platform, said springs providing a counterbalancing restoring force to reduce a load placed on said first drive motor; and an auxiliary support pole unit, said auxiliary support pole unit being provided at its lower end with an auxiliary wheel and restricted to a certain angle of rotation.