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A foldable wheelchair includes two side frames, each having a front wheel and a rear wheel mounted thereon, and a scissor-type element arranged between the side frames and having two scissor-type arms that are mounted pivotably in the side frames in one scissor-type element end. The scissor-type arm

A foldable wheelchair includes two side frames, each having a front wheel and a rear wheel mounted thereon, and a scissor-type element arranged between the side frames and having two scissor-type arms that are mounted pivotably in the side frames in one scissor-type element end. The scissor-type arms are mounted pivotably in another scissor-type element end in manually actuable actuating members that are mounted pivotably to the side frames at a distance from the pivot axis of the other scissor-type element end. A folding hinge is mounted pivotably in the side frames and is arranged at a distance from the other scissor-type element end. An actuating means is connected pivotably to the folding hinge at a distance from the side frames and is effective between the folding hinge and one of the actuating members at a distance from the pivot axis of the actuating member in the associated side frame. Means are provided for fixing at least one actuating member relative to the associated side frame in the unfolded position of the wheelchair.

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1. A foldable wheelchair comprising: two side frames, in each of which a front wheel and a rear wheel are mounteda scissor-action element, which is arranged between the side frames and has two scissor-action arms, the scissor-action arms, in the region of a scissor-action element end, are mounted in

1. A foldable wheelchair comprising: two side frames, in each of which a front wheel and a rear wheel are mounteda scissor-action element, which is arranged between the side frames and has two scissor-action arms, the scissor-action arms, in the region of a scissor-action element end, are mounted in a pivotable manner in the side frames, the scissor-action arms, in the region of another scissor-action element end, are mounted in a pivotable manner in manually actuable adjusting members, which are mounted in a pivotable manner in the side frames at a distance from the pivot axis of the another scissor-action element end in the associated adjusting member;a folding hinge, which is mounted in a pivotable manner in the side frames at a distance from the another scissor-action element end;an adjusting means, which is connected in a pivotable manner to the folding hinge at a distance from where the folding hinge is mounted in the side frames, the adjusting means being active between the folding hinge and one of the adjusting members, at a distance from the pivot axis of said adjusting member in the associated side frames; andmeans by way of which at least one adjusting member is secured in an opened-out position of the wheelchair relative to the side frame assigned to said adjusting member. 2. The foldable wheelchair according to claim 1, further comprising a bearing rod for a pushing handle for pushing the wheelchair mounted in each adjusting member. 3. The foldable wheelchair according to claim 2, wherein each bearing rod, when the wheelchair is in the opened-out position, is arranged perpendicularly to the plane in which the front wheels and the rear wheels stand on the ground and, in a folded-together position of the wheelchair, each bearing rod, in the region of an end which accommodates the pushing handle, is arranged adjacent to the associated side frame. 4. The foldable wheelchair according to claim 3, wherein each adjusting member, for the purpose of transferring the wheelchair from the opened-out position into the folded-together position, can be pivoted through an angle of about eighty degrees (80°) to about ninety degrees (90°). 5. The foldable wheelchair according to claim 1, characterized in that the folding hinge can be folded in a plane which is parallel to the plane in which the front wheels and the rear wheels stand on the ground. 6. The foldable wheelchair according to claim 3, wherein the folding hinge, in the folded-together position, is directed towards a rear axle of the wheelchair, said rear axle extending between the rear wheels. 7. The foldable wheelchair according to claim 6, wherein the scissor-action element, in the region of one scissor-action element end, and the folding hinge are connected to the side frames in front of the rear axle and the scissor-action element, in the region of the other scissor-action element end, is mounted in the adjusting members behind the rear axle. 8. The foldable wheelchair according to claim 7, wherein the scissor-action arms, in the region of one scissor-action element end, are mounted in first holders such that they can be pivoted about parallel pins, and these the first holders are mounted in the side frames such that they can be pivoted about a pin, which is arranged perpendicularly to said parallel pins, and the scissor-action arms, in the region of the other scissor-action element end, are mounted in second holders such that they can be pivoted about parallel pins, and these the second holders are mounted in the adjusting members such that they can be pivoted about a pin, which is arranged perpendicularly to said parallel pins. 9. The foldable wheelchair according to claim 8, wherein the scissor-action element, in the region of one scissor-action element end, is mounted in lower regions of the side frames and the adjusting members, which accommodate the scissor-action element in the region of the other scissor-action element end, are mounted in upper regions of the side frames. 10. The foldable wheelchair according to claim 7, wherein the adjusting means, in the region of an end which is directed away from the folding hinge, is mounted in a pivotable manner in one of the adjusting members or is mounted in a pivotable manner in one of the second holders for one of the scissor-action arms, said second holder being mounted in the adjusting member. 11. The foldable wheelchair according to claim 1, wherein the adjusting means is telescopic and has a stop for limiting the contracting movement of the adjusting means when the wheelchair is in the opened-out position. 12. The foldable wheelchair according to claim 1, wherein the folding hinge comprises two hinge parts, and wherein spring means are active between one of the side frames and one of the hinge parts of the folding hinge for the subjecting said hinge part to an adjusting force to move the folding hinge in the direction of the folded-together position. 13. The foldable wheelchair according to claim 12, wherein the folding hinge has bearing pins and a pivot pin between the two hinge parts, and wherein the bearing pins of the folding hinge and the pivot pin of the folding hinge (12), in the opened-out position of the wheelchair, are arranged on a straight line. 14. The foldable wheelchair according to claim 1, wherein the adjusting members are mounted in a pivotable manner in a region of rear ends of the side frames, and wherein first bearing pins of the scissor-action element in a region of the other scissor-action element end are arranged beneath, and behind, second bearing pins of the adjusting members in the side frames. 15. The foldable wheelchair according to claim 1, wherein a position where the folding hinge is mounted in the side frames and a position of bearing points of the scissor-action element end can be altered for the purpose of adjusting a width of the side frames.