All-terrain wheelchair

• US 5,020,818 A
• Filed: 11/20/1989
• Issued: 06/04/1991
• Est. Priority Date: 10/27/1988
• Status: Expired due to Fees

• Current Assignee: Stuart G. Oxford
• Original Assignee: Stuart G. Oxford
• Inventors: Oxford, Stuart G.
• Primary Examiner(s): HILL, MITCHELL
• Application Number:
  US07/439,612
• Time in Patent Office: 561 Days
• Field of Search: 280/250.1, 280/304.1, 280/253, 280/DIG. 10, 180/907
• US Class Current: 280/250.1
• CPC Class Codes: A61G 5/023 acting directly on hubs or axis
• CPC Class Codes: A61G 5/025 Levers
• CPC Class Codes: A61G 5/027 by using auxiliary detachable mechanisms
• CPC Class Codes: A61G 5/06 with obstacle mounting facilities, e.g. for climbing stairs, kerbs or steps
• CPC Class Codes: A61G 5/061 for climbing stairs
• CPC Class Codes: A61G 5/066 with endless belts
• CPC Class Codes: A61G 5/1051 Arrangements for steering
• CPC Class Codes: B60F 3/0061 Amphibious vehicles specially adapted for particular purposes or of a particular type armoured amphibious vehicles F41H7/00; equipment for working under water B63C11/00; flating bridges designed as or mounted on vehicles E01D15/22
• CPC Class Codes: B62K 2015/005 having additional wheels for use when folded or collapsed
• CPC Class Codes: B62K 5/007 power-driven
• CPC Class Codes: B62K 5/023 specially adapted for disabled riders, e.g. personal mobility type vehicles with three wheels wheelchairs A61G5/00
• CPC Class Codes: B62M 1/14 operated exclusively by hand power
• CPC Class Codes: B62M 1/16 by means of a to-and-fro movable handlebar
• CPC Class Codes: Y10S 280/10 Stair climbing chairs

Abstract

An all-terrain wheelchair comprising a frame having a pair of wheels rotatably mounted at each side thereof with a seat mounted on the frame between the wheels. Each pair of the wheels is operatively interconnected so that rotation of one wheel of the pair of wheels will cause both wheels to rotate. A ratchet arm is operatively connected to each of the front wheels so that the operator may propel the wheelchair. An optional flexible track is also provide for each pair of wheels.

Claims

1. An all-terrain wheelchair, comprising,

a frame means having a forward end, a rearward end, and opposite sides,

a first pair of wheels, which are normally in ground engagement, rotatably mounted on said frame means at one side thereof comprising a front wheel and a rear wheel,

a second pair of wheels, which are normally in ground engagement, rotatably mounted on said frame means at the other side thereof comprising a front wheel and a rear wheel,

a seat means on said frame means for supporting a person thereon,

a gripping wheel positioned inwardly of each of the said rear wheels and operatively connected thereto whereby the person sitting on said seat means may grasp the same to propel said rear wheels.

2. The wheelchair of claim 1, wherein a first flexible track means extends around said first pair of wheels and wherein a second flexible track means extends around said second pair of wheels, said first and second track means being in ground engagement, rather than said first and second pairs of wheels, when said first and second track means are mounted on said first and second pairs of wheels.

3. The wheelchair of claim 2, wherein said first and second track means are removably mounted on said first and second pairs of wheels.

4. The wheelchair of claim 1, wherein a first chain means operatively interconnects said first pair of wheels and a second chain means operatively interconnects said second pair of wheels.

5. An all-terrain wheelchair, comprising,

a frame means having a forward end, a rearward end, and opposite sides,

a first pair of wheels, which are normally in ground engagement, rotatably mounted on said frame means at one side thereof comprising a front wheel and a rear wheel,

a second pair of wheels, which are normally in ground engagement, rotatably mounted on said frame means at the other side thereof comprising a front wheel and a rear wheel,

a seat means on said frame means for supporting a person thereon,

a ratchet means operatively connected to one of said wheels at each side of said frame means and including an elongated actuating arm extending upwardly therefrom at opposite sides of said seat mans whereby the person sitting on said seat means may propel said wheels by selectively reciprocating said actuating arms.

6. The wheelchair of claim 5, wherein a flexible track means extends around each pair of wheels, and wherein said track means is in ground engagement, rather than each pair of wheels, when each of said track means is mounted on each of said pairs of wheels.

7. The wheelchair of claim 5, wherein a gripping wheel is positioned inwardly of each of said rear wheels and being operatively connected thereto whereby the person sitting on the seat means may propel the wheelchair by the actuating arms or the gripping wheels.

8. The wheelchair of claim 5, wherein first and second chains operatively interconnect the wheels of said first and second pairs of wheels respectively.