Combination wheelchair-walker device

Abstract

A combination wheelchair-walker having an upper frame; a lower frame comprised of two arc-shaped members, in which each arch-shaped member is configured to extend from the front of the device to the back of the device, each of the two arc-shaped members having a front end and a rear end; two front wheels; two rear caster wheels, each of which is attached to the rear end of one of the two arc-shaped members; and two skids, each of which is attached to the front end of one of the two arc-shaped members. The upper frame is configured to be detached from the lower frame by unlocking four retention pins and lifting the upper frame off of the lower frame.

Claims

1. A combination wheelchair-walker device with a front and a back comprising: (a) an upper frame; (b) a lower frame comprised of two upwardly curved arc-shaped members, wherein each arc-shaped member is configured to extend from the front of the device to the back of the device, each of the two arc-shaped members having a front end and a rear end; (c) two front wheels, wherein at least one of the two front wheels are directly attached to at least one footrest frame mount; (d) two rear caster wheels, each of which is attached to the rear end of one of the two arc-shaped members; and (e) two skids, each of which is attached to the front end of one of the two arc-shaped members.

2. The combination wheelchair-walker device of claim 1, further wherein the at least one footrest frame mount comprises two footrest frame mounts, wherein a footrest is attached to each of the footrest frame mounts; and wherein each footrest frame mount is comprised of a horizontal part and a vertical part joined together at a ninety-degree angle; and wherein the vertical part is attached to a wheel mount that is fixedly attached to one of the two front wheels.

3. The combination wheelchair-walker device of claim 2, further comprising a joinder bar that connects the two arc-shaped members; wherein each end of the joinder bar terminates in a vertical tube that is secured adjacent to the vertical part of the footrest frame mount.

4. The combination wheelchair-walker device of claim 1, further comprising a seat frame, a seat pad, and a back pad.

5. The combination wheelchair-walker device of claim 4, further comprising a front push bar that is U-shaped; wherein each end of the U-shaped push bar terminates in a tube member; wherein each of the tube members fits telescopically into a front handlebar; and wherein the front handlebars extend forwardly from the upper frame.

6. The combination wheelchair-walker device of claim 5, further comprising a fall restraint assembly; wherein the fall restraint assembly comprises a safety strap, two loop members that encircle the front push bar, a clasp and a buckle; wherein the safety strap is Y-shaped and extends from the two loop members to a central point where the safety strap continues as a single strap to the clasp; and wherein the buckle is located on an underside of the seat frame, and the claps fits into the buckle.

7. The combination wheelchair-walker device of claim 4, wherein the upper frame is comprised of two rear vertical members that terminate in backwardly extending rear handlebars, two front support members with lower ends that constitute upper vertical telescoping tubes, two lower connection members to which the seat pad is attached, and two upper connecting members that connect the front support members to the rear vertical members; and wherein each of the front support members is comprised of an upper vertical telescoping tube portion, a front handlebar, and a straight central portion that joins the vertical telescoping tube portion and the front handlebar.

8. The combination wheelchair-walker device of claim 7, further comprising two armrests that are situated on top of the upper connecting members.

9. The combination wheelchair-walker device of claim 7, further comprising a rear push bar that is removably attached to a rear end of each of the two upper connecting members.

10. The combination wheelchair-walker device of claim 7, further comprising two footrests, each of which is attached to a footrest frame mounts; wherein the footrest frame mount is comprised of a horizontal part and a vertical part joined together at a ninety-degree angle; wherein the vertical part of the footrest frame mount is attached to a wheel mount that is fixedly attached to one of the two front wheels; wherein the upper vertical telescoping tubes are configured to fit into the vertical part of the footrest frame mount; wherein the vertical part of the footrest frame mount is configured to form a receptacle for receiving the upper vertical telescoping tube; and wherein a lower vertical telescoping tube extends upwardly from a rear end of each of the two arc-shaped members and is configured to fit into a receptacle formed by a lower end of one of the two rear vertical members.

11. The combination wheelchair-walker device of claim 10, wherein the upper frame is configured to be detached from the lower frame by unlocking four retention pins and lifting the upper frame off of the lower frame, two of the four retention pins being used to secure the upper vertical telescoping tubes into the vertical part of the footrest frame mounts, and the remaining two of the four retention pins being used to secure the lower vertical telescoping tubes into the receptacles formed by the lower ends of the rear vertical members.

12. The combination wheelchair-walker device of claim 1, further comprising a brake assembly; wherein the brake assembly comprises a hand brake, a brake pad housing, a brake pad, and a brake cable.

13. The combination wheelchair-walker device of claim 1, further comprising two push rails, each of which is spaced apart from and outwardly of one of the two front wheels; wherein each of the two front wheels comprises a front wheel frame; and wherein the push rail is connected to the front wheel frame of one of the two front wheels.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view of the present invention shown with the footrests in a down position.

(2) FIG. 2 is a perspective view of the present invention shown with the footrests in an up position.

(3) FIG. 3 is a perspective view of the present invention shown with the front push bar open and the fall restraint assembly detached from the seat frame.

(4) FIG. 4 is an exploded view of the present invention.

(5) FIG. 5A is a side view of the present invention shown with the wheelchair tipped backward so that the caster wheels are on the ground and the skids are up.

(6) FIG. 5B is a side view of the present invention shown with the wheelchair tipped forward so that the skids are on the ground and the caster wheels are up.

(7) FIG. 6 is a detail perspective view of the fall restraint assembly.

(8) FIG. 7A is a partial side view of the present invention showing the brake assembly in a braking position.

(9) FIG. 7B is a partial side view of the present invention showing the brake assembly in a neutral position.

(10) FIG. 7C is a partial side view of the present invention showing the brake assembly in a parking position.

(11) FIG. 8 is a side view of the present invention shown with the upper frame detached from the lower frame.

(12) FIG. 9 is a top perspective view of the present invention shown with the rear push bar detached from the upper frame.

REFERENCE NUMBERS

(13) 1 Upper frame 1a Rear handlebar 1b Upper vertical telescoping tube 1c Rear vertical member 1d Front support member 1e Lower connecting member 1f Upper connecting member 2 Rear push bar 2a Front handlebar 3 Armrest 4 Seat back pad 5 Seat frame 5a Seat pad 6 Spring button 7 Retention pin 7a Vertical retention pin 8 Front push bar 8a Telescoping member (long) 8b Telescoping member (short) 9 Fall restraint safety strap 9a Loop member 9b Clasp 9c Buckle 10 Hand brake 10a Brake pad housing 10b Brake pad 10c Brake cable 11 Lower frame 11a Lower vertical telescoping tube 11b Wheel mount 11c Footrest frame mount 11d Joinder bar 11e Vertical tube 11f Bracket 12 Rear caster wheel 13 Front wheel 13a Front wheel push rail 13b Front wheel bolt 14 Footrest 15 Skid

DETAILED DESCRIPTION OF INVENTION

(14) FIG. 1 is a perspective view of the present invention shown with the footrests in a down position. As shown in this figure, the invention is comprised of an upper frame 1, a lower frame 11, two front wheels 13, and two caster wheels 12. The invention is further comprised of a seat frame 5, seat pad 5a, and back pad 4. In FIG. 1, the footrests 14 are shown in a down position. The lower frame 11 is comprised of two arc-shaped members (see also FIG. 4), each of which is oriented so that the arcs extend from front to back. The rear end of each arc-shaped member is attached to a caster wheel 12. The front end of each arc-shaped member is attached to a skid 15.

(15) FIG. 2 is a perspective view of the present invention shown with the footrests in an up position. Each footrest 14 is attached to a footrest frame mount 11c, which is comprised of a horizontal part and a vertical part joined together at a ninety-degree angle (see FIG. 4). The vertical part is attached to a wheel mount 11b, which is fixedly attached to the wheel 13 with a bolt 13b. Each of the front wheels comprises a push rail 13a, which is spaced apart from and outwardly of the front wheel 13 and is connected to the front wheel frame via a plurality of connectors 13c. The push rail 13a allows the user to propel the wheelchair manually while seated in it and without assistance from another person.

(16) FIG. 3 is a perspective view of the present invention shown with the front push bar open and the fall restraint assembly detached from the seat frame. This is the position in which the chair would need to be in order for someone to get into it (sit down). As shown in this figure, the front push bar 8 is U-shaped (see also FIG. 4) with each end of the U terminating in a tube member. The tube members 8a, 8b fit telescopically into the front handlebars 2a, which extend forwardly from the upper frame 1 (see also FIG. 4). Note that 8a is preferably longer than 8b to allow the front push bar 8 to swing down and hang within the front handlebar 2a without having to be completely removed when the user enters or exits the chair (as shown in FIG. 3). The fall restraint assembly comprises a safety strap 9, two loop members 9a that encircle the front push bar 8 at its left and right ends, a clasp 9b and a buckle 9c. In a preferred embodiment, the safety strap 9 is Y-shaped and extends downward from the two loop members 9a to a central point, where the safety strap continues as a single strap (the bottom of the Y) to the clasp 9b (see also FIG. 6). The clasp 9b fits into a buckle 9c on the underside of the seat frame 5.

(17) FIG. 4 is an exploded view of the present invention. As shown in this figure, the upper frame 1 is comprised of two rear vertical members 1c that terminate in backwardly extending rear handlebars 1a, two front support members 1d whose lower ends constitute upper vertical telescoping tubes 1b, two lower connecting members 1e to which the seat pad 5a is attached with retention pins 7, and two upper connecting members 1f that connect the front support members 1d to the rear vertical members 1c. Each of the front support members 1d is comprised of an upper vertical telescoping tube portion 1b, a front handlebar 2a, and a straight central portion that joins the vertical telescoping tube portion and the front handlebar. In this example, the angle between the vertical telescoping tube portion and the central portion is approximately one hundred thirty-five degrees, as is the angle between the front handlebar and the central portion.

(18) When the chair is assembled, armrests 3 are situated on top of the upper connecting members 1f. A rear push bar 2 is removably attached to the rear end of the two upper connecting members 1f, as shown. A spring button 6 allows a person to remove the rear push bar 2 by depressing the spring button. Similarly, a spring button 6 allows the front push bar 8 to be detached from the front handlebars 2a. The front and rear handlebars 2a, 1a and the front and rear push bars 8, 2 are all preferably covered with a foam grip. The foam grips are shown in FIG. 1 but removed from subsequent figure for clarity.

(19) As shown in this figure, when the chair is assembled, the upper vertical telescoping tubes 1b fit into the vertical part of the footrest frame mount 11c, which forms a receptacle for receiving the upper vertical telescoping tube 1b. Similarly, the lower vertical telescoping tubes 11.a extending from the rear of the lower frame 11 fit into receptacles formed by the lower ends of the rear vertical members 1c (see also FIG. 8). A joinder bar 11d connects the two arc-shaped members of the lower frame 11. Each end of the joinder bar 11d terminates in a vertical tube 11e that is held by brackets 11f adjacent to the vertical part of the footrest frame mount 11c and secured with a vertical retention pin 7a. The joinder bar 11d provides added stability to the lower frame 11.

(20) FIG. 5A is a side view of the present invention shown with the wheelchair tipped backward so that the caster wheels are on the ground and the skids are up. FIG. 5B is a side view of the present invention shown with the wheelchair tipped forward so that the skids are on the ground and the caster wheels are up. As shown in these two figures, the central axis of the front wheels 13 acts as a fulcrum about which the entire wheelchair rotates or tilts, depending on how the user places his or her weight. For example, when the user is sitting in the wheelchair, the caster wheels 12 will be in contact with the ground, as shown in FIG. 5A. When the user stands up and places his or her weight on the front push bar 8, then the wheelchair is in the position shown in FIG. 5B, with the skids 15 on the ground. To use the device as a walker, the user would lift up on the front push bar 8 so that the skids 15 are no longer in contact with the ground, take a step, and then place the skids 15 back down on the ground to prevent the wheelchair from moving.

(21) The length and arc of the lower frame 11 are configured so that when someone is sitting in the chair or when no one is sitting in the chair nor placing weight on the front push bar 8, all four wheels (the two front wheels 13 and the two rear caster wheels 12) are in contact with the ground, and the skids 15 are above the ground. As soon as weight is placed onto the front push bar 8, the chair tilts forward (around the central axis of the front wheels) so that the rear caster wheels 12 are above the ground and the skids 15 are in contact with the ground.

(22) FIG. 6 is a detail perspective view of the fall restraint assembly. As described above, the fall restraint assembly is comprised of a safety strap 9, two loop members 9a that encircle the front push bar 8 at its left and right ends, a clasp 9b and a buckle 9c. This figure clearly shows the loop members 9a and the Y-shaped safety strap 9, as well as the buckle 9c on the underside of the seat frame 5. When the device is used as a walker, the bottom part of the Y-shaped safety strap will be positioned between the user's two legs so that if he falters, he would not fall to the ground. At the same time, the two strap segments that form the top part of the Y-shaped safety strap will cradle the user's upper body.

(23) FIGS. 7A, 7B and 7C show the brake assembly of the present invention in a braking, neutral and parking position, respectively. The brake assembly comprises a hand brake 10, brake pad housing 10a, brake pad 10b, and brake cable 10e. To use the brake while in the chair, the user would squeeze on the hand brake 10, pulling it toward the front support member 1d. This action would cause the brake pad 10b to engage with the front wheel 13, as shown in FIG. 7A. The brake assembly will only remain in a braking position as long as the user is squeezing the hand brake 10; once pressure on the hand brake is released, the brake system will automatically return to the neutral position, disengaging the brake pad 10b from the front wheel 13 (FIG. 7B).

(24) To put the brake assembly into a parking position, from the neutral position the user would push the hand brake 10 forward (away from the front support member 1d) until the hand brake audibly clicks, at which point the brake pad 10b would engage with the front wheel 13 (as shown in FIG. 7C) and remain in that position until the hand brake 10 is once again moved rearward. Note that the brake pad 10b is housed within the brake pad housing 10a, and the brake pad 10b is connected to the hand brake 10 via the brake cable 10c.

(25) FIG. 8 is a side view of the present invention shown with the upper frame detached from the lower frame. In this particular embodiment, the buckle 9c is attached to the seat frame 5 via a downwardly protruding extension of the seat frame 5, as shown. This is to facilitate access to the buckle 9c. This figure clearly shows how the upper vertical telescoping tubes 1b fit into the vertical part of the footrest frame mount 11c and the lower vertical telescoping tubes 11a fit into receptacles formed by the lower ends of the rear vertical members 1c. Both the upper vertical telescoping tubes and the lower vertical telescoping tubes are secured in place with retention pins 7. The fact that the upper frame 1 can be detached from the lower frame 11 by simply unlocking four retention pins and lifting the upper frame off of the lower frame is a distinct advantage of the present invention.

(26) FIG. 9 is a top perspective view of the present invention shown with the rear push bar detached from the upper frame. As mentioned above, the rear push bar 2 is removably attached to the rear end of the two upper connecting members 1f. Having the rear push bar 2 in addition to the rear handlebars 1a makes it easier for a person to push the wheelchair from behind.

(27) Although the preferred embodiment of the present invention has been shown and described, it will be apparent to those skilled in the art that many changes and modifications may be made without departing from the invention in its broader aspects. The appended claims are therefore intended to cover all such changes and modifications as fall within the true spirit and scope of the invention.