Stand-up wheelchair
View Patent ↗The invention relates to a stand-up wheelchair comprising a frame ( 29 ) to which two drive wheels ( 30 ) and at least one steerable wheel ( 31 ) are fixed. A stand-up unit ( 33 ) provided with a height-adjustable seat ( 3 ), a back rest ( 7 ), and at least one foot rest ( 32 ), is pivotably arranged on said wheelchair. The inventive wheelchair is characterized in that the seat ( 3 ) is mounted, on both sides, on an articulation parallelogram structure consisting of an upper longitudinal rail ( 1 ) which is connected to the seat ( 3 ) in a fixed manner and comprises a front articulation point ( 10 ) and a rear articulation point ( 11 ), a lower longitudinal rail ( 2 ) comprising a front articulation point ( 12 ) and a rear articulation point ( 13 ), and two guides ( 4, 19 ) connecting the front articulation points ( 10, 12 ) and the rear articulation points ( 11, 13 ). The inventive wheelchair is also characterized in that the parallelogram structure can be displaced by a lifting device ( 36 ) in order to adjust the height of the seal ( 3 ).
1. A standing wheelchair including a chassis onto which two drive wheels and at least one steerable wheel are attached, the standing wheelchair comprising:
a seat;
a backrest positioned at a back end of the seat;
at least one foot support positioned generally forward of and below the seat; and
an uplift unit coupled to the seat, the backrest and the foot support, the uplift unit configured to raise and lower the seat and provide coordinated movement of the foot support,
wherein the uplift unit supports the seat by
an upper longitudinal track connected to and positioned below the seat, the upper track including front and back hinge points,
a lower longitudinal track connected to and positioned below the upper track, the lower track including front and back hinge points and front and back guides, the front guide attached to the upper and lower track front hinge points and the back guide attached to the upper and lower track back hinge points, forming a parallelogram, and
a hub unit connected to the parallelogram formed by the upper and lower tracks and front and back guides, the hub unit moving the parallelogram upwards and rearward for adjustment of the seat height, without significant changes to an incline angle of the seat or the relative position of the upper and lower tracks.
2. The standing wheelchair according to claim 1 , wherein the uplift unit further comprising a longitudinal strut connected at a front end of the longitudinal strut to the front hinge point of the lower track and at a back end of the longitudinal strut to a hinge point on the chassis and a steering strut connected at a front end of the steering strut via a hinge to the upper track and at a back end of the steering strut via a hinge to the chassis, the longitudinal and steering struts working in conjunction with the hub unit to raise and lower the seat.
3. The standing wheelchair according to claim 1 , wherein the seat comprises a stageless adjustment of seat depth relative to the backrest.
4. The standing wheelchair according to claim 1 , wherein the hub unit comprises at least one spindle.
5. The standing wheelchair according to claim 4 , wherein the spindle is self locking.
6. The standing wheelchair according to claim 1 , wherein the back ends of the upper and lower tracks each comprise a slot and wherein the backrest is mounted within both slots by lower ends of the backrest.
7. The standing wheelchair according to claim 6 , wherein the backrest comprises slide blocks which slide into the slots and which are fixable on opposite sides of the upper and lower tracks.
8. The standing wheelchair according to claim 7 , wherein each slide block is connected to a plate, and each plate is connected to the backrest via a hinge.
9. The standing wheelchair according to claim 6 , wherein the upper and lower tracks include recesses positioned parallel to and offset from the slots, and wherein the backrest comprises a plurality of locking pins positioned for insertion into the recesses.
10. The standing wheelchair according to claim 9 , wherein the backrest further comprises a multi-section grip unit and the locking pins are located on the grip unit.
11. The standing wheelchair according to claim 10 , wherein the grip unit includes multiple parts that are connected via hinges.
12. The standing wheelchair according to claim 9 , wherein the recesses are located at regular intervals.
13. The standing wheelchair according to claim 1 , wherein the uplift unit further comprises a balance strut connected at a front end of the balance strut with a hinge to one of the front and back guides and at a back end of the balance strut with a hinge to the chassis.