other features and advantages of the invention will become apparent from a consideration of the following detailed description and the accompanying drawings . the device embodying the present invention combines the functions of a wheelchair , a walker , and a sitting chair . in the interest of brevity , the combined wheelchair , walker , and sitting chair will be referred to herein as a device . as shown in the figures , the invention is embodied in a device 10 . the device 10 comprises a frame 12 , which includes a first front leg 14 , which extends vertically upward in a use orientation shown in fig1 , and has a first end 16 and a second end 18 , with the first end 16 of the first front leg 14 of the frame 12 being located beneath the second end 18 of the first front leg 14 of the frame 12 in the use orientation . the frame 12 further includes a second front leg 20 , which extends vertically upward in the use orientation , and has a first end 22 and a second end 24 , with the first end 22 of the second front leg 20 of the frame 12 being located beneath the second end 24 of the second front leg 20 of the frame 12 in the use orientation . the frame 12 further includes a first rear leg 26 , which extends upward at an oblique angle in the use orientation , and has a first end 28 and a second end 30 , with the first end 28 of the first rear leg 26 of the frame 12 being located beneath the second end 30 of the first rear leg 26 of the frame 12 in the use orientation . the frame 12 further includes a second rear leg 32 , which extends upward at an oblique angle in the use orientation , and has a first end 34 and a second end 36 , with the first end 34 of the second rear leg 32 of the frame 12 being located beneath the second end 36 of the second rear leg 32 of the frame 12 in the use orientation . the frame 12 further includes a first arm rest 40 , which connects the second end 18 of the first front leg 14 of the frame 12 to the second end 30 of the first rear leg 26 of the frame 12 . the first arm rest 40 of the frame 12 has a first end 42 connected to the second end 18 of the first front leg 14 of the frame 12 , and a second end 44 spaced - apart from the second end 30 of the first rear leg 26 of the frame 12 , with the second end 30 of the first rear leg 26 of the frame 12 being connected to the first arm rest 40 of the frame 12 , at a location between the first end 42 of the first arm rest 40 of the frame 12 and the second end 44 of the first arm rest 40 of the frame 12 . the frame 12 further includes a second arm rest 46 , which connects the second end 24 of the second front leg 20 of the frame 12 to the second end 36 of the second rear leg 32 of the frame 12 . the second arm rest 46 of the frame 12 has a first end 48 connected to the second end 24 of the second front leg 20 of the frame 12 , and a second end 50 spaced - apart from the second end 36 of the second rear leg 32 of the frame 12 , with the second end 30 of the first rear leg 26 of the frame 12 being connected to the second arm rest 46 of the frame 12 , at a location between the first end 48 of the second arm rest 46 of the frame 12 and the second end 50 of the second arm rest 46 of the frame 12 . the frame 12 further includes a first cross arm 60 , which connects the first front leg 14 of the frame 12 to the first rear leg 26 of the frame 12 . the first cross arm 60 of the frame 12 has a first end 62 connected to the first front leg 14 of the frame 12 , at a location between the first end 16 of the first front leg 14 of the frame 12 , and the second end 18 of the first front leg 14 of the frame 12 , and a second end 64 connected to the first rear leg 26 of the frame 12 , at a location between the first end 28 of the first rear leg 26 of the frame 12 and the second end 30 of the first rear leg 26 of the frame 12 . the first cross arm 60 extends parallel to the first arm 40 . the frame 12 further includes a second cross arm 66 , which connects the second front leg 20 of the frame 12 to the second rear leg 32 of the frame 12 . the second cross arm 66 of the frame 12 has a first end 68 connected to the second front leg 20 of the frame 12 , at a location between the first end 22 of the second front leg 20 of the frame 12 and the second end 24 of the second front leg 20 of the frame 12 , and a second end 70 connected to the second rear leg 32 of the frame 12 , at a location between the first end 34 of the second rear leg 32 of the frame 12 and the second end 36 of the second rear leg 32 of the frame 12 . the first cross arm 60 of the frame 12 extends parallel to the second arm 46 of the frame 12 . the frame 12 further includes a first back rest element 74 , which has a first end 76 connected to the first rear leg 26 , adjacent to the second end 64 of the first cross arm 60 of the frame 12 , and extends vertically upward therefrom in the use orientation . the first back rest element 74 of the frame 12 has a second end 78 located above the first end 76 of the first back rest element 74 of the frame 12 in the use orientation . the frame 12 further includes a second back rest element 80 , which has a first end 82 connected to the second rear leg 32 of the frame 12 , adjacent to the second end 70 of the second cross arm 66 of the frame 12 , and extends vertically upward therefrom in the use orientation . the second back rest element 80 of the frame 12 has a second end 84 located above the first end 82 of the second back rest element 80 of the frame 12 in the use orientation . the frame 12 further includes a first rear cross brace 96 , which has a first end 98 connected to the first rear leg 26 of the frame 12 , adjacent to the second end 64 of the first cross arm 60 of the frame 12 , and a second end 100 connected to the second rear leg 32 of the frame 12 . the first rear cross brace 96 of the frame 12 , the first cross arm 60 of the frame 12 , and the second cross arm 66 of the frame 12 are coplanar . the frame 12 further includes a second rear cross brace 102 , which has a first end 104 connected to the second end 78 of the first back rest element 74 of the frame 12 , and a second end 106 connected to the second end 84 of the second back rest element 80 of the frame 12 . the second rear cross brace 102 of the frame 12 is parallel to the first rear cross brace 96 of the frame 12 . the frame 12 further includes a first top brace 110 , which has a first end 112 connected to the second end 78 of the first back rest element 74 of the frame 12 , and a second end 114 . the first top brace 110 of the frame 12 extends parallel to the first arm rest 40 of the frame 12 . the frame 12 further includes a second top brace 116 , which has a first end 118 connected to the second end 84 of the second back rest element 80 of the frame 12 , and a second end 120 . the second top brace 116 of the frame 12 extends parallel to the second arm rest 46 of the frame 12 . the frame 12 further includes a first support brace 130 , which has a first end 132 connected to the second end 114 of the first top brace 110 of the frame 12 , and a second end 134 connected to the first arm rest 40 of the frame 12 , at a location between the second end 30 of the first rear leg 26 of the frame 12 and the first end 42 of the first arm rest 40 of the frame 12 . the first support brace 130 of the frame 12 extends vertically upward from the second end 134 of the first support brace 130 of the frame 12 to the first end 132 of the first support brace 130 of the frame 12 in the use orientation , as shown in fig1 . the frame 12 further includes a second support brace 136 , which has a first end 138 connected to the second end 120 of the second top brace 116 of the frame 12 , and a second end 140 connected to the second arm rest 46 of the frame 12 , at a location between the second end 36 of the second rear leg 32 of the frame 12 and the first end 48 of the second arm rest 46 of the frame 12 . the second support brace 136 of the frame 12 extends vertically upward from the second end 140 of the second support brace 136 of the frame 12 to the first end 138 of the second support brace 136 of the frame 12 in the use orientation . the device 10 further comprises a seat 150 , which is mounted on the first rear cross brace 96 of the frame 12 , the first cross arm 60 of the frame 12 , and the second cross arm 66 of the frame 12 . the device 10 further comprises a back support 152 , which has a first end 154 connected to the first back rest element 74 of the frame 12 , at a location adjacent to the first arm rest 40 of the frame 12 , and a second end 156 connected to the second back rest element 80 of the frame 12 , at a location adjacent to the second arm rest 46 of the frame 12 . the device 10 further comprises a first arm rest cover 160 , which is mounted on the first arm rest 40 of the frame 12 , between the second end 134 of the first support brace 130 of the frame 12 and the first end 42 of the first arm rest 40 of the frame 12 , and a second arm rest cover 162 , which is mounted on the second arm rest 46 of the frame 12 , between the second end 140 of the second support brace 136 of the frame 12 and the first end 48 of the second arm rest 46 of the frame 12 . the device 10 further comprises a first tray mounting element 166 , which is mounted on the first arm rest 40 of the frame 12 , and a second tray mounting element 168 , which is mounted on the second arm rest 46 of the frame 12 . the device 10 further comprises a tray 170 , which is mounted on the first and second tray mounting elements 166 , 168 to support food , work , or the like , for a person sitting in the device 10 . the device 10 further comprises a first hand grip pivot mount 172 , which is located on the first top brace 110 of the frame 12 , and a second hand grip pivot mount 174 , which is located on the second top brace 116 of the frame 12 . the device 10 further comprises a first hand grip 180 , which has a proximal end 182 pivotally mounted in the first hand grip pivot mount 172 , and a distal end 184 spaced - apart from the proximal end 182 of the first hand grip 180 . the first hand grip 180 is pivotally movable between a use position , shown in fig1 , having the first back rest element 74 of the frame 12 located between the distal end 184 of the first hand grip 180 and the proximal end 182 of the first hand grip 180 , and a stored position , shown in fig2 , having the first support brace 130 of the frame 12 located between the distal end 184 of the first hand grip 180 and the proximal end 182 of the first hand grip 180 . the device 10 further comprises a second hand grip 190 , which has a proximal end 192 pivotally mounted in the second hand grip pivot mount 174 , and a distal end 194 spaced - apart from the proximal end 192 of the second hand grip 190 . the second hand grip 190 is pivotally movable between a use position , shown in fig1 , having the second back rest element 80 of the frame 12 located between the distal end 194 of the second hand grip 190 and the proximal end 192 of the second hand grip 190 , and a stored position , shown in fig2 , having the second support brace 136 of the frame 12 located between the distal end 194 of the second hand grip 190 and the proximal end 192 of the second hand grip 190 . the device 10 further comprises a first sleeve 200 , which is telescopingly connectable to the first front leg 14 of the frame 12 . the first sleeve 200 has a first end 202 , a second end 204 , and a cap 206 on the second end 204 of the first sleeve 200 . the device 10 further comprises a first lock 208 , which releasably connects the first sleeve 200 to the first front leg 14 of the frame 12 , and has a plurality of holes , such as holes 210 , defined through the first sleeve 200 , with the holes 210 being spaced - apart from each other , from adjacent to the first end 202 of the first sleeve 200 , toward the second end 204 of the first sleeve 200 . the device 10 further comprises a button 212 on the first front leg 14 of the frame 12 , which is received in one of the plurality of holes 210 of the first sleeve 200 when the first sleeve 200 is connected to the first front leg 14 of the frame 12 . the device 10 further comprises a second sleeve 220 , which is telescopingly connectable to the second front leg 20 of the frame 12 , and has a first end 222 , a second end 224 , and a cap 226 on the second end 224 of the second sleeve 220 . the device 10 further comprises a second lock 230 , which releasably connects the second sleeve 220 to the second front leg 20 of the frame 12 , and has a plurality of holes , such as holes 234 defined through the second sleeve 220 , with the holes 234 being spaced - apart from each other , from adjacent to the first end 222 of the second sleeve 220 , toward the second end 224 of the second sleeve 220 . the device 10 further comprises a button 236 on the second front leg 20 of the frame 12 . the button 236 is received in one of the plurality of holes 234 of the second sleeve 220 when the second sleeve 220 is connected to the second front leg 20 of the frame 12 . one form of the device 10 further comprises a third sleeve telescopingly connectable to the first front leg 14 of the frame 12 . the third sleeve has a first end and a second end . this form also comprises a third lock releasably connecting the third sleeve to the first front leg 14 of the frame 12 . the third lock has a plurality of holes defined through the third sleeve , with the holes being spaced - apart from each other , from adjacent to the first end of the third sleeve , toward the second end of the third sleeve . the button on the first front leg 14 of the frame 12 is received in one of the plurality of holes of the third sleeve when the third sleeve is connected to the first front leg 14 of the frame 12 . this form further comprises a fourth sleeve telescopingly connectable to the second front leg 20 of the frame 12 . the fourth sleeve has a first end and a second end . this form still further comprises a fourth lock , which releasably connects the fourth sleeve to the second front leg 20 of the frame 12 . the fourth lock has a plurality of holes defined through the fourth sleeve , with the holes being spaced - apart from each other , from adjacent to the first end of the fourth sleeve , toward the second end of the fourth sleeve . the button on the second front leg 20 of the frame 12 is received in one of the plurality of holes of the fourth sleeve when the fourth sleeve is connected to the second front leg 20 of the frame 12 . the device 10 further comprises wheel units , such as a first wheel unit 250 and a second wheel unit 252 , which can be connected to either the first and second sleeves 200 , 220 or to the third and fourth sleeves , as desired . the device 10 further comprises a first set of rear wheels 260 , which is mounted on the first end 28 of the first rear leg 26 of the frame 12 , and a second set of rear wheels 262 , which is mounted on the first end 34 of the second rear leg 32 of the frame 12 . the device 10 further comprises a brake unit , which includes a first brake handle 270 on the first hand grip 180 , and a second brake handle 272 on the second hand grip 190 . the device 10 further comprises a first brake shoe 274 , which is on the first set of rear wheels 260 , and a second brake shoe 276 , which is on the second set of rear wheels 262 . the device 10 further comprises first connection mechanism 280 , which operably connects the first brake handle 270 to the first brake shoe 274 , and a second connection mechanism 282 , which operably connects the second brake handle 272 to the second brake shoe 276 . the brake connection mechanisms 280 , 282 may include cables , joints , and the like , such as might be used to connect the hand brake of a bicycle to the brake shoes of the bicycle , as will be understood by those skilled in the art . thus , the exact structure of the brake mechanisms will not be discussed in detail . brakes can also be operated by a person sitting in the device 10 using straps or the like , as is known to those skilled in the art . the strap brakes can be used to provide further stability to the device 10 while the person is moving into or out of the device 10 . the first rear cross brace 96 of the frame 12 , the first cross arm 60 of the frame 12 , and the second cross arm 66 of the frame 12 are all located beneath the second ends 134 , 140 of the first and second support braces 130 , 136 of the frame 12 , at a distance sufficient to locate a center of gravity of the frame 12 beneath the second ends 134 , 140 of the first and second support braces 130 , 136 of the frame 12 . the device 10 further comprises a weight , such as a weight 288 , which can be included to further control the location of the center of gravity of the device 10 and thus increase the stability thereof . another form of the device 10 comprises a back support cushion 290 having straps , such as strap 292 , which releasably engage the back support 152 when the back support cushion 290 is in place , as shown in fig2 . the back support cushion 290 assists in maintaining proper posture . the device 10 may also comprise first and second foot rests 294 and 296 , as shown in fig5 , mounted on the frame 12 . yet another form of the device 10 , shown in fig6 , comprises a lower cross brace 300 and a foot pedal 302 on the lower rear cross brace 300 . the lower cross brace 300 and the foot pedal 302 provide further control of the device 10 for a person pushing the device 10 . it is understood that while certain forms of the present invention have been illustrated and described herein , it is not to be limited to the specific forms or arrangements of parts described and shown .
a supportive device for use as a wheelchair and a walker . a pair of handgrips are pivotally attached to a frame so as to have a rearwardly - facing position and a forwardly - facing position . a seat is pivotally attached to the frame so as to have a horizontal position and a vertical position . when using the supportive device as the wheelchair , a pair of front legs of the frame terminate in wheels , the seat is in the horizontal position thereof , and the pair of handgrips are in the rearwardly - facing position thereof . when the supportive device is used as the walker , the pair of front legs terminate in either wheels or caps , the seat is in the vertical position thereof , and the pair of handgrips are in the forwardly - facing position thereof .