# US 8,540,266 B2 · Wheelchair

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- Number: US 8,540,266 B2
- Document ID: US8540266B2
- Status: Granted
- Kind: B2
- Application number: 13/134,888
- Filed: 2011-06-20
- Published: 2012-01-19
- Granted: 2013-09-24
- Earliest claimed: 2007-12-05
- Applicants: Scott Bradley Baker
- Inventors: Scott Bradley Baker
- Web page: https://patentgrep.com/patent/US8540266B2

## CPC

- A61G 5/023: {acting directly on hubs or axis}
- A61G 5/025: {Levers}
- A61G 5/1078: {with shock absorbers or other suspension arrangements between wheels and frame}
- A61G: TRANSPORT, PERSONAL CONVEYANCES OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS (appliances for aiding patients or disabled persons to walk A61H3/00); OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES (embalming corpses A01N1/00)

## Abstract

A wheelchair comprises a main frame and a seat mounted on the main frame. A pair of front wheels and a pair of rear wheels are also mounted on the frame. A propulsion mechanism is provided for driving the rear wheels, the propulsion mechanism comprising an arm lever for forward and back movement and a gear train between the arm lever and the rear wheels.

## Claims

### Claim 1

A wheelchair comprising:
a drive member housing having a first axle and a second axle;
a rear wheel attached to the first axle of the drive member housing;
a seat frame mounted on the drive member housing;
a seat mounted on the seat frame;
an arm lever extending from the second axle of the drive member housing to a position such that it can be readily operated by an user in the seat; and
a front frame arm attached to the drive member housing, the front frame arm having a front wheel.

### Claim 2 (depends on 1)

A wheelchair as claimed in claim 1 wherein the seat frame is mounted on the drive member housing, and the seat is releasably mounted on the seat frame.

### Claim 3 (depends on 1)

A wheelchair as claimed in claim 1 wherein the front frame arm is pivotally attached to the drive member housing and movable between a fully unfolded position and a fully folded position.

### Claim 4 (depends on 1)

A wheelchair as claimed in claim 1 wherein the seat comprises a seat bottom portion and a seat back, the seat portion and seat back being movable relative to each other between a fully open position and a fully folded position.

### Claim 5 (depends on 3)

A wheelchair as claimed in claim 3 wherein the frame arm is pivotally mounted on the drive member housing, and the frame arm comprises: at least two apertures, a plunger provided for engaging one of the apertures to fix the frame arm relative to the drive member housing, and a lock mechanism provided to move the plunger between a locked position in which it engages one of the apertures and an unlocked position in which it is disengaged from the apertures.

### Claim 6 (depends on 4)

A wheelchair as claimed in claim 4 wherein the seat portion has a seat hinge, and the seat back as a seat back hinge, and a lock/unlock mechanism is provided to facilitate relative movement between the seat hinge and the seat back hinge between the fully open position and the fully folded position.

### Claim 7 (depends on 2)

A wheelchair as claimed in claim 2 further comprising a locking mechanism for securing the seat to the seat frame, the locking mechanism comprising a bushing accommodated in an aperture in the frame, the bushing having an upper leg and a lower leg, the lower leg being operably connected to a handle for rotating the bushing between a first locked position and a second unlock position, the upper leg engaging a lock cylinder located in the seat when in the first locked position, and disengaging the lock cylinder when in the second unlock position.