All-terrain wheeled vehicle

An all-terrain wheeled vehicle. The wheeled vehicle includes a frame having a handle assembly, which is configured to allow a person to propel the wheeled vehicle by either pulling or pushing the vehicle, and a pair of large diameter wheels provided on opposite sides of the frame. Intermediate the wheels, mounted on the frame is a load carrier, such as a stretcher, chair or basket. The wheeled vehicle includes a wheel positioning system including a wheel track adjuster and individually adjustable wheel height adjusters for varying the height of each of the vehicle wheels with respect to the lad carrier. Optional power assisted drive and braking mechanisms are also provided.

1. An all-terrain wheeled vehicle comprising: a frame having a handle assembly extending from a first end thereof, said handle assembly for allowing a person to propel the wheeled vehicle; at least one pair of large diameter wheels disposed on opposite sides of the frame; a load carrier disposed intermediate the pair of large diameter wheels; and a wheel positioning system including a wheel track adjuster for adjustably positioning said wheels a desired distance from each other and a wheel height adjuster for individually adjusting the height of each of the large diameter wheels with respect to the load carrier.

2. The all-terrain wheeled vehicle of claim 1, wherein the large diameter wheels have a diameter substantially larger than five feet.

3. The all-terrain wheeled vehicle of claim 1, wherein the large diameter wheels include suspension spokes.

4. The all-terrain wheeled vehicle of claim 1, wherein the handle assembly includes two independently height adjustable handle arms.

5. The all-terrain wheeled vehicle of claim 1, wherein the wheel positioning system comprises a pneumatic power supply, a wheel track adjustment pneumatic cylinder, a wheel height adjustment cylinder for each wheel and a pneumatic control system for controlling pneumatic power to each pneumatic cylinder to adjust the relative positions of each wheel with respect to the load carrier and each other.

6. The all-terrain wheeled vehicle of claim 5, wherein the pneumatic power supply includes a high pressure air tank containing a volume of high pressure air.

7. The all-terrain wheeled vehicle of claim 5, wherein the pneumatic control system includes a pneumatic valve assembly for directing pneumatic power to each pneumatic cylinder and a controller for controlling the valve assembly.

8. The all-terrain wheeled vehicle of claim 7, wherein the controller includes an electric power supply, an electronic valve controller and an operator input device for controlling the electronic valve controller.

9. The all-terrain wheeled vehicle of claim 1, wherein the wheel positioning system comprises a manually adjustable wheel track positioner.

10. The all-terrain wheeled vehicle of claim 1, wherein the wheel positioning system comprises a manually adjustable wheel height positioning system configured to independently adjust a wheel height of each wheel with respect to said load carrier.

11. The all-terrain wheeled vehicle of claim 1, wherein said load carrier comprises a chair.

12. The all-terrain wheeled vehicle of claim 1, wherein said load carrier comprises a baggage carrier for carrying baggage, tools, equipment and the like.

13. The all-terrain wheeled vehicle of claim 1, wherein said load carrier comprises a stretcher for carrying an occupant in a prone position.

14. The all-terrain wheeled vehicle of claim 1 further comprising a power assist drive mechanism.

15. The all-terrain wheeled vehicle of claim 14, wherein said power assist drive mechanism comprises at least one drive motor selectively engaging at least one drive hub provided on at least one vehicle wheel.

16. The all-terrain wheeled vehicle of claim 15, wherein said power assist drive mechanism comprises a rotating drive mechanism provided on each said drive motor, said rotating drive mechanism frictionally engaging a frictional drive surface on said at least one drive hub.

17. The all-terrain wheeled vehicle of claim 16, wherein said frictional drive surface comprises a toothed drive surface and wherein said drive mechanism comprises a toothed sprocket.

18. The all-terrain wheeled vehicle of claim 16, wherein said frictionally engaging, rotating drive surface comprises a smooth surface and wherein said drive mechanism comprises a friction drive wheel.

19. The all-terrain wheeled vehicle of claim 1 further comprising a braking system.

20. The all-terrain wheeled vehicle of claim 19, wherein said braking system comprises a frictional braking system provided for at least one of said pair of large diameter wheels, said frictional braking system configured to frictionally engage a braking surface associated with at least one of said pair of large diameter wheels.

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