Pallet truck

• US 9,475,513 B2
• Filed: 10/15/2014
• Issued: 10/25/2016
• Est. Priority Date: 07/25/2014
• Status: Active Grant

• Current Assignee: Big Lift LLC
• Original Assignee: Big Lift LLC
• Inventors: Liu, Yuanwei, Meng, Feiquan, He, Jinhui
• Primary Examiner(s): GRANT, ALVIN J
• Application Number:
  US14/514,666
• Publication Number:
  US 20160023872A1
• Time in Patent Office: 741 Days
• Field of Search: 254/2.R
• US Class Current: 1/1
• CPC Class Codes: B62B 3/001 Steering devices
• CPC Class Codes: B62B 3/0612 power operated
• CPC Class Codes: B62B 3/0618 using fluid lifting mechanisms
• CPC Class Codes: B62B 5/0053 Arrangements of batteries
• CPC Class Codes: B62B 5/0069 Control

Abstract

A pallet truck is provided having an electrical system that reduces wear and the likelihood of fracture of the control wiring and output cable by having a controller to which they are connected also be mounted to the steering mechanism that rotates relative to a base support portion of a truck frame, and a hydraulic power unit that permits a reduced size and height, with a manual hydraulic cylinder and cylinder body at a substantially similar height, and the cylinder body and oil storage cavity in a concentric arrangement.

Claims

1. A pallet truck having an electrical system comprising:

a truck frame, the truck frame having a load lift portion and a base support portion coupled to and rearward of the load lift portion, a steering mechanism rotatably connected to the truck frame at the base support portion, a manual hydraulic power unit connected to the steering mechanism and being coupled at an upper end to the load lift portion and at a lower end to the base support portion, the steering mechanism further comprising an operating handle, a power source mounted to the load lift portion, a controller mounted to the steering mechanism proximate the manual hydraulic power unit, the controller and power source being connected by a power cable, the controller and the steering mechanism being connected by control wiring, the controller and a drive motor being connected by an output cable, wherein when the operating handle is turned to steer, the steering mechanism, manual hydraulic power unit, controller, control wiring and output cable rotate together relative to the base support portion.

2. The pallet truck in accordance with claim 1, wherein the lower end of the manual hydraulic power unit further comprises an installation pedestal that is installed on the base support portion.

3. The pallet truck in accordance with claim 2, wherein the controller is connected to the operating handle by the control wiring.

4. The pallet truck in accordance with claim 1, wherein the hydraulic power unit is configured to lift the load lift portion relative to the base support portion.

5. The pallet truck in accordance with claim 1, wherein the operating handle is connected to the hydraulic power unit.

6. The pallet truck in accordance with claim 1, wherein the manual hydraulic power unit further comprises a manual hydraulic cylinder and an oil storage cavity arranged concentrically with a cylinder body of the manual hydraulic cylinder.

7. The pallet truck in accordance with claim 6, wherein the operating handle is configured to operate the manual hydraulic cylinder via pivotal movement of the operating handle.

8. The pallet truck in accordance with claim 1, wherein when the operating handle is turned to steer the vehicle, the power cable twists or bends between the controller and the power source.

9. The pallet truck in accordance with claim 1, wherein a charging controller is mounted on the load lift portion and is connected to the power source.

10. The pallet truck in accordance with claim 1, wherein the steering mechanism further comprises a drive wheel.

11. The pallet truck in accordance with claim 10, wherein the drive motor is coupled to the drive wheel.

12. The pallet truck in accordance with claim 11, wherein the drive motor is located within the drive wheel.

13. A hydraulic power unit for a pallet truck comprising:

an installation pedestal, a cylinder body, an oil storage cavity, a push rod, an operating handle, and a manual hydraulic cylinder, wherein the manual hydraulic cylinder is located above the installation pedestal, the operating handle is connected to the manual hydraulic cylinder, the manual hydraulic cylinder and the cylinder body are at a substantially similar height, the oil storage cavity extends above the cylinder body, the push rod is located above the oil storage cavity, and wherein the operating handle is configured to operate the manual hydraulic cylinder via pivotal movement of the operating handle.

14. The hydraulic power unit for a pallet truck in accordance with claim 13, wherein the cylinder body and oil storage cavity are concentrically arranged.

15. The hydraulic power unit for a pallet truck in accordance with claim 13, wherein the oil storage cavity is located adjacent the manual hydraulic cylinder.