EP3556336A1 - Rigid frame wheelchair - Google Patents

Abstract

Rigid-frame wheelchair (1) according to a box-frame concept with: - a base frame (2), which has a rear axle (5) for receiving rear wheels (16) as well as a left side strut (3) and a right side strut (4 ) for receiving steering wheels (17) in front areas, - an L-shaped seat foot support frame (6) which has an L-shaped left (7) and right strut (8), the respective strut (7 or 8) has a seat tube segment (45) and a foot support tube segment (44), - two coupling units (13) which surround the base frame (2) in the left and right front area with the seat foot support frame (6) in the area of its foot support tube segments (44) connect an axis vertically to a sagittal plane for an angular adjustment, and in which the footrest tube segments (44) are adjustably mounted for seat height adjustment, - a left (11) and right frame connector (12), which connect the base frame (2) and the seat tube segments ( 45) firmly connected inden in different positions. Advantage: Adjustment of seat height and seat angle with little use of material and labor.

Description

The invention relates to a rigid-frame wheelchair, which is designed according to the box frame concept.

Against the background of a person sitting on the wheelchair, the following specifications regarding the front, rear, right, left, top, bottom and sagittal are to be understood, and when the wheelchair is placed on a horizontal surface, the specifications are also vertical, horizontal and vertical.

Rigid frame wheelchairs are well known in the art. They are used where the focus is on light weight, stiffness and maximum maneuverability.

They are so-called active wheelchairs with certain setting options, or individual adjustment options for active (as opposed to passive - pushed by a companion) users and differ essentially by two concepts:
The open-frame concept and the box-frame concept.

In the open frame concept, the frame (without back frame) consists of an L-shaped seat foot support frame - with seat frame segment and foot support frame segment - And one, welded to the seat frame segment (individual construction) or adjustably mounted (adjustable) Hinterachskonstruktion. The advantages of this concept are the low weight and the space-saving housing (with removed rear wheels / drive wheels) for transport, since the L-shaped frame takes up little space and can be easily inserted between other packages in the trunk.

• Helium Pro von der Firma Sunrise Medical, als individuelle (verschweißte) Variante http://www.sunrisemedical.de/rollstuehle/sopur/adaptivrollstuhl-helium
• Argon von der Firma Sunrise Medical als anpassbare Variante http://www.sunrisemedical.de/rollstuehle/sopur/aktivrollstuhl-argon-2
• ZR von der Firma Permobil als individuelle (verschweißte) Variante https://permobilus.com/product/zr/
• ZRA von der Firma Permobil als anpassbare Variante https://permobilus.com/product/zra/

Examples of an open-frame concept are the following listed wheelchairs:

• Helium Pro from the company Sunrise Medical, as an individual (welded) version http://www.sunrisemedical.de/rollstuehle/sopur/adaptivrollstuhl-helium
• Argon from the company Sunrise Medical as an adaptable variant http://www.sunrisemedical.de/rollstuehle/sopur/aktivrollstuhl-argon-2
• ZR by Permobil as an individual (welded) version https://permobilus.com/product/zr/
• ZRA by Permobil as a customizable version https://permobilus.com/product/zra/

In the box frame concept, there is an additional frame connection from the rear axle to the footrest frame segment in the area of the steering wheels. All frame parts are rigidly connected.

The advantage of this concept is the higher stiffness compared to the open-frame concept.

• Easy Life R von der Firma Sunrise Medical http://www.sunrisemedical.de/rollstuehle/sopur/starrrahmen-rollstuhl-easylife-r
• TR von der Firma Permobil als individuelle (verschweißte) Variante mit festgelegter Sitzhöhe und festgelegtem Sitzwinkel, jedoch mit längsverstellbarer Hinterachse zur Einstellung des Aktivgrades.
  https://permobilus.com/product/tr/
• TRA von der Firma Permobil als anpassbare (Sitzhöhe, Sitzwinkel, Aktivgrad) Variante
  https://permobilus.com/product/tra/
• SPEEDY 4TEEN von der Firma PROACTIV als anpassbare (Sitzhöhe, Sitzwinkel, Aktivgrad) Variante http://www.proactiv-gmbh.de/jugendrollstuhl speedy4teen.html

Examples of a box-frame concept are the following listed wheelchairs:

• Easy Life R from Sunrise Medical http://www.sunrisemedical.de/rollstuehle/sopur/starrrahmen-rollstuhl-easylife-r
• TR by the company Permobil as an individual (welded) variant with fixed seat height and fixed seat angle, but with longitudinally adjustable rear axle for setting the degree of activity.
  https://permobilus.com/product/tr/
• TRA by the company Permobil as customizable (seat height, seat angle, active degree) variant
  https://permobilus.com/product/tra/
• SPEEDY 4TEEN by the company PROACTIV as customizable (seat height, seat angle, active degree) Variant http://www.proactiv-gmbh.de/jugendrollstuhl speedy4teen.html

In the adaptable variant, the steering forks are angularly fixed to the frame, so that their axis of rotation can always be aligned independently of the set seat angle to the vertical or vertical. This is essential to avoid "flapping" of the steering wheels. To adjust the seat angle (or the rear seat height), the distance between the rear axle and the seat tube is adjusted. The closer the rear axle is positioned to the seat tube, the larger the seat angle becomes for a given seat height. For the installation of rear wheels with camber, the camber adapter is rotatably mounted in the rear axle tube or in the rear wheel mount. This allows the tracking of the rear wheels when changing the seat angle. Also, the tracking is essential for a low-friction running of the rear wheels.

The following discussion relates to the box-frame concept, particularly with customizable frames, such as a box. TRA by Permobil, or SPEEDY 4TEEN by PROACTIV.

• Die Sitzhöhe
• Der Sitzwinkel
• Der Aktivgrad, oder auch Schwerpunkt

Hier ist die relative Lage - aus lateraler Sicht - der Hinterachse (Antriebsräder) zum Rücken gemeint.Apart from seat width and seat depth, the main fitting / setting parameters of an active wheelchair are:

• The seat height
• The seat angle
• The degree of activity, or focus

Here, the relative position - from a lateral view - the rear axle (drive wheels) meant to the back.

The farther the rear axle is from the back to the front - in the direction of travel - is positioned, the more active is the setting, or the closer it is below the center of gravity of the system wheelchair / user. The wheelchair is thus very manoeuvrable, but increases the risk of tipping to the same extent. A very active attitude is reserved for experienced drivers only.

The closer the rear axle is to or even behind the back, the tipping is the wheelchair, but the more cumbersome it can be moved.

To be considered closer to the adjustment of seat height and seat angle in the aforementioned box frame concept in an adaptable variant.

To roughly fit different body sizes, most manufacturers offer 3-4 frame sizes. The adjustment of the exact seat height (for a given frame size) is done by choosing different high steering forks, as well as the different height positioning of the steering wheels in the steering forks, the adjustment of the seat angle (or rear seat height) by adjusting the distance of the rear axle to the seat frame.

• Die Notwendigkeit des Einsatzes verschieden hoher Lenkgabeln erhöht den Lagerbestand bei Herstellern und Fachgeschäften.
• Bei einer nachträglichen Sizhöhenanpassung müssen u.U. neue Lenkgabeln besorgt und neu eingebaut werden.
• Bei einer Verstellung des Sitzwinkels (durch Versetzen der Hinterachse) müssen die Lenkgabeln neu zur Senkrechten justiert werden. Sind die Hinterräder mit Sturz eingebaut (wie in den meisten Fällen), muss deren Spur neu eingestellt werden, andernfalls erzeugen sie eine hohe Reibung und Reifenverschleiß.

The following disadvantages must be taken into account in this concept:

• The necessity of using different high steering forks increases the stock of manufacturers and specialty stores.
• In a subsequent Sizhöhenanpassung may have new steering forks worried and reinstalled.
• When adjusting the seat angle (by moving the rear axle), the steering forks must be readjusted to the vertical. If the rear wheels are installed with camber (as in most cases), their track must be reset, otherwise they create high friction and tire wear.

The object of the present invention is to provide a rigid-frame wheelchair in an adaptable box-frame concept, in which the adjustment of seat height and seat angle with less material and less effort to accomplish.

The problem is solved by a rigid-frame wheelchair which is designed according to the features of patent claim 1. Advantageous developments of the invention are the subject of the dependent claims.

• einem Basisrahmen, der eine Hinterachse zur Aufnahme von Hinterrädern sowie eine linke Seitenstrebe und eine rechte Seitenstrebe zur Aufnahme von Lenkrädern in vorderen Bereichen der Seitenstreben aufweist,
• einem L-förmigen Sitz-Fußstützrahmen, der eine L-förmige linke Strebe und eine L-förmige rechte Strebe aufweist, wobei die jeweilige Strebe ein Sitzrohrsegment und ein Fußstützrohrsegment aufweist, ferner der Sitz-Fußstützrahmen eine Querstrebe aufweist, die die Streben verbindet,
• zwei Kupplungseinheiten, die den Basisrahmen im linken und rechten vorderen Bereich mit dem Sitz-Fußstützrahmen im Bereich dessen linker und rechter Fußstützrohrsegmente um eine Achse vertikal zu einer Sagittalebene für eine Winkeleinstellung gelenkig verbinden, und in denen die Fußstützrohrsegmente für eine Sitzhöhenverstellung verstellbar gelagert sind,
• einem linken Rahmenverbinder und einem rechten Rahmenverbinder, wobei die Rahmenverbinder den Basisrahmen und die Sitzrohrsegmente fest miteinander verbinden, wobei die Sitzrohrsegmente in unterschiedlichen Positionen mit den Rahmenverbindern verbindbar sind.

In the rigid-frame wheelchair according to the invention, the rigid form of a box frame is dissolved with firmly welded frame parts and replaced by separate, mutually adjustable frame parts. A rigid-frame wheelchair designed according to the box-frame concept is proposed with the following features:

• a base frame having a rear axle for receiving rear wheels and a left side strut and a right side strut for receiving steering wheels in front portions of the side struts,
• an L-shaped seat foot support frame having an L-shaped left strut and an L-shaped right strut, wherein the respective strut comprises a seat tube segment and a Fußstützrohrsegment further, the seat foot support frame has a transverse strut connecting the struts,
• two coupling units hingedly connecting the base frame in the left and right front area with the seat foot support frame in the region of the left and right Fußstützrohrsegmente about an axis vertical to a sagittal plane for an angular adjustment, and in which the Fußstützrohrsegmente are adjustably mounted for a seat height adjustment,
• a left frame connector and a right frame connector, wherein the frame connector, the base frame and the seat tube segments firmly together connect, wherein the seat tube segments are connected in different positions with the frame connectors.

To achieve a higher stability, it is considered advantageous to install an additional transverse strut movable on the seat foot support frame in the rear region of the seat tube segments, at the left and right-hand ends of which the left and right frame connectors are preferably fastened.

Since in the construction thus described the base frame to the roadway always the same position (distance and angle), it requires neither at the steering forks nor at the rear wheels error-prone adjustments or exchanges. Seat angle and seat height are adjusted solely by rotation of the seat-foot support frame with the coupling units (seat angle), or by moving in the coupling units (seat height) and by fixing the seat tube segments to the left and right frame connectors.

In particular, the Fußstützrohrsegmente are firmly connected in their set displacement position with the coupling units. In addition, it may be provided to block the joints after the angle adjustment of the Fußstützrohrsegmente.

Further features of the invention are set forth in the subclaims, the description of the figures and the figures themselves, wherein it is noted that all individual features and all combinations of individual features represent further inventive embodiments.

FIG.1

in einer räumlichen Ansicht einen Rollstuhl ohne die der Aufnahme einer Person dienenden Sitz- und Rückenflächen,

FIG.2

in einer räumlichen Ansicht den Rollstuhl für einen Teilbereich, der im Wesentlichen den Basisrahmen, den Sitz-Fußstützrahmen, die Kupplungseinheiten und die Rahmenverbinder betrifft,

FIG.3

in einer räumlichen Ansicht den Bereich des Rollstuhls, der im Wesentlichen den Basisrahmen betrifft,

FIG.4

in einer räumlichen Ansicht den Bereich des Rollstuhls, der den SitzFußstützrahmen betrifft,

FIG.5

in einer räumlichen Darstellung gemäß FIG.2 die dortige Anordnung, allerdings in einer Explosionsdarstellung,

FIG.6

in einer Ansicht einen Teilbereich des Rollstuhls im Bereich der Anbindung von Basisrahmen und Sitz-Fußstützrahmen,

FIG.7

in einer Ansicht eine Ausbildung des jeweiligen Rahmenverbinders mit Langlöchern ohne Rasterungen,

FIG.8

in einer Ansicht eine Ausbildung des jeweiligen Rahmenverbinders mit Langlöchern mit Rasterungen,

FIG.9

den Starr-Rahmen von der linken Seite gesehen, bei ausgeblendetem linken Rahmenverbinder, veranschaulicht bei einer Einstellung des Starr-Rahmens mit einem Sitzwinkel von 0° gegenüber der Fahrbahn,

FIG.10

eine Darstellung gemäß FIG 9, veranschaulicht für einen Sitzwinkel von ca. 5° gegenüber der Fahrbahn,

FIG.11

den Starr-Rahmen mit einer Einstellung der maximalen Sitzhöhe, bei einem Sitzwinkel von 0° gegenüber der Fahrbahn,

FIG.12

den Starr-Rahmen gemäß FIG.11, bei einer mittleren Sitzhöhe, sowie einem Sitzwinkel von 0° gegenüber der Fahrbahn,

FIG.13

den Starr-Rahmen gemäß FIG.11, bei einer niedrigsten Sitzhöhe, sowie einem Sitzwinkel von 0° gegenüber der Fahrbahn.

In the figures, the invention is explained with reference to preferred embodiments, without being limited thereto. It shows:

FIG.1

in a spatial view, a wheelchair without the seat and back surfaces serving to accommodate a person,

FIG.2

in a spatial view, the wheelchair for a partial area, which essentially relates to the base frame, the seat-foot support frame, the coupling units and the frame connectors,

FIG.3

in a three-dimensional view the area of the wheelchair, which essentially concerns the base frame,

FIG.4

in a spatial view, the area of the wheelchair that affects the seat footrest frame,

FIG.5

in a spatial representation according to FIG.2 the local arrangement, but in an exploded view,

FIG.6

in a view a portion of the wheelchair in the area of the connection of base frame and seat foot support frame,

FIG.7

in a view an embodiment of the respective frame connector with slots without grids,

FIG.8

in a view an embodiment of the respective frame connector with slots with latches,

FIG.9

the rigid frame seen from the left side, with hidden left frame connector, illustrated with a setting of the rigid frame with a seat angle of 0 ° to the road,

FIG.10

a representation according to FIG. 9 , illustrated for a seat angle of about 5 ° to the road,

FIG.11

the rigid frame with a setting of the maximum seat height, with a seat angle of 0 ° to the road,

FIG.12

according to the rigid frame FIG.11 , with a middle seat height, and a seat angle of 0 ° to the road,

FIG.13

according to the rigid frame FIG.11 , at a lowest seat height, and a seat angle of 0 ° to the road.

figure description

FIG.1 shows a foldable wheelchair 1 without the inclusion of a person serving seat and back surfaces.

The wheelchair 1 has as essential components a base frame 2, a seat foot support frame 6, a cross brace 10, a left frame connector 11 and a right frame connector 12, coupling units 13, a back frame 14, a footrest 15, rear wheels 16, front wheels 17, a left Rear brake 18 and a right rear wheel brake 19 and a left wheel cover 20 and a right wheel cover 21 on ( FIG.1 ).

Below is on the representation of the FIGS. 2 to 13 Reference made illustrating the essential for the implementation of the seat angle and seat height adjustment of the wheelchair components of the wheelchair or their individual components.

The base frame 2 ( FIG.3 ), consisting of left side strut 3, right side strut 4 and rear axle 5, is by means of coupling units 13, each consisting of ( FIG.5 ) Coupling piece 24, clamping element 25 and connecting elements 26, 27, 28, 29, 30 and 31 with the seat foot support frame 6 about an axis vertically connected to the sagittal plane ( FIG.2 ). The embodiment of the base frame 2 shown here represents only one possible embodiment. For example, the side struts 3 and 4 could, for example, also be designed such that they each consist of a tube bending part whose front tube section is perpendicular to the sagittal plane and the coupling unit 13 can be directly rotated and clamped receives. Separate steering fork mountings could be attached to appropriate pipe sections.

The rear axle 5 in the embodiment shown here is displaceable for adjustability of the wheelbase on the struts 3 and 4 and is fixed by clamping. But it could also be welded directly to the side struts 3 and 4, for example. The rear axle 5 is arranged perpendicular to the sagittal plane.

• Die Aufnahme von Lagersitzen für die Lenkgabel 52 eines Vorderrades 17
• Die Aufnahme von einem Stoßschutz 32 (FIG.5)
• Die Lagerung der Kupplungseinheit 13

In the described embodiment ( FIG.3 ), the left side strut 3 and right side strut 4 each consist of a strut tube 22 and a multi-functional part 23, which is firmly connected to the strut tube 22 (eg welded). The multifunction part 23 essentially fulfills three functions:

• The inclusion of bearing seats for the steering fork 52 of a front wheel 17th
• The inclusion of a bumper 32 ( FIG.5 )
• The storage of the coupling unit 13

For rotatable and positive mounting of the coupling units 13, the multifunction parts 23 each have a blind hole 42 on their side directed towards the sagittal plane ( FIG.3 ), which with a stub approach 43 ( FIG.5 ) of the respective coupling piece 24 corresponds. The axis of the blind hole is perpendicular to the sagittal plane. The coupling units 13 are respectively screwed by means of connecting elements 33 and 34 with the side struts 3 and 4 to the multifunction parts 23.

Left and right strut 7 and 8 of the seat foot support frame 6 are received with their Fußstützrohrsegmenten 44 in the coupling piece 24 linearly adjustable and by means of securing elements 29, 30 and 31 in the coupling piece 24 in a, corresponding to the desired seat height, bore 47 (FIGS. FIG.6 ). The holes 47 require a gradual seat height variation. It is also conceivable stepless adjustment, for example by clamping.

By means of clamping element 25 and the connecting elements 26, 27 and 28, the coupling units 13 can be fixed non-positively to the Fußstützrohrsegmenten 44 of the left and right struts 7 and 8. This allows the exact alignment of the coupling units 13 on the holes 47 and facilitates the placement and assembly of the connecting elements 29, 30 and 31st

After the above-described determination of seat angle and seat height must be made by means of frame connector 11 and 12, a stable connection between the base frame 2 and seat foot support frame 6 in their respective rear area. This can be realized in many ways, for example by telescopic pipe connections or by struts that can be attached at different distances between and on base frame 2 and seat foot support frame 6.

In a preferred form, the frame connectors 11 and 12 are formed as plates, which are screwed by means of connecting elements 36 with the rear axle 5 firmly. This frame connector 11 and 12 may thus be made of a different material than the rear axle 5, for example made of carbon. The frame connector 11 and 12 extend with its upper contour preferably approximately concentric with the rear wheels 16. They can serve as such at the same time as clothing protection against the spoked wheels and record a back frame construction. They each have a slot 48 (here slightly curved), which extends from slightly above the rear axle 5 obliquely forward above. These slots 48 correspond with slots 46 in the seat tube segments 45 of the left and right struts 7 and 8 and form with these depending on the setting of seat angle, seat height and wheelbase (position of the rear axle 5) an intersection at different positions with respect to both slots. By means of clamping block 38, which are guided in the region and along the slots 46 in the seat tube segments 45 of the left and right struts 7 and 8 and the clamping plates 40 and the connecting elements 39 and 41, the left strut 7 with the frame connector 11 and the right strut 8 jammed with the frame connector 12 and thus give the entire frame construction ultimately stability.

In each case a crash adapter 35 (in the present case 6 °) is connected to the rear axle 5 and the frame connector 11 or to the rear axle 5 and the frame connector 12 in a fixed position - without the need for readjustment of the track at seat angle adjustment.

In a preferred embodiment, an additional transverse strut 10, consisting of transverse strut tube 37 and transverse strut couplings 49, is installed. It is taken up by the left and right struts 7 and 8 in the cross-strut couplings 49 and the transverse bores 50 of the cross-strut couplings 49 brought into coincidence with the respective intersections of the slots 46 and 48. In this position the transverse strut 10 is also clamped together with the frame connectors 11 and 12 and the left and right struts 7 and 8 and at the same time by means of clamping block 38, clamping plates 40 and the connecting elements 39 and 41.

The slots 48 may be formed in a variety of forms. However, a preferred goal is that the clamping block 38 when adjusting seat angle and seat height as far as possible travel both in relation to the slots 46, and the slots 48 and thus generate the highest possible frictional resistance.

In a particular form, the elongated holes 48 have rasters ( FIG.8 ). This allows on the one hand the exact same setting on the left and right side and on the other hand in addition to the traction and a secure fit between frame connectors 11 and 12 and the clamping plates 40th Die Langloch ohne Rasterung ( FIG.7 ) has the advantage of a stepless angle adjustment. The shaft heels 51 of the clamping plates 40 are adapted to the respective associated Langloch type.

The FIGS. 9 to 13 show a rigid frame according to the invention in adaptable box frame concept from the left side. In this case, the left frame connector 11 is hidden to better represent the relative position of the slots 46 and 48 and the cross member 10 (and thus the clamping block 38).

FIG.9 shows the rigid frame with a seat angle of 0 ° with respect to the road, FIG.10 with a seat angle of approx. 5 °.

FIG.11 shows the rigid frame with the maximum seat height setting, FIG.12 with a middle seat height and FIG.13 with the lowest seat height; in all cases with a seat angle of 0 ° with respect to the roadway.

LIST OF REFERENCE NUMBERS

1

Falling wheelchair

2

base frame

3

Left side strut

4

Right side strut

5

rear axle

6

Seat Fußstützrahmen

7

left strut

8th

right strut

9

crossmember

10

crossmember

11

left frame connector

12

right frame connector

13

clutch unit

14

back frame

15

footrest

16

rear wheel

17

front

18

left rear brake

19

right rear brake

20

left wheel cover

21

right wheel cover

22

pursuit pipe

23

Multifunction part

24

coupling

25

clamping element

26

connecting element

27

connecting element

28

connecting element

29

Connecting element / securing element

30

Connecting element / securing element

31

Connecting element / securing element

32

impact protection

33

connecting element

34

connecting element

35

fall adapter

36

connecting element

37

Crossbars pipe

38

clamping block

39

connecting element

40

clamping disc

41

Connecting element / securing element

42

blind

43

Stub sentence

44

Fußstützrohrsegment

45

Seat tube segment

46

Long hole

47

drilling

48

Long hole

49

Crossbars clutch

50

cross hole

51

shaft shoulder

52

steering fork

Claims (13)

Rigid frame wheelchair (1) designed according to a box-frame concept, having the following features: - a base frame (2) having a rear axle (5) for receiving rear wheels (16) and a left side strut (3) and a right side strut (4) for receiving steering wheels (17) in front areas of the side struts (3, 4 ) having, - An L-shaped seat foot support frame (6) having an L-shaped left brace (7) and an L-shaped right brace (8), wherein the respective strut (7 or 8), a seat tube segment (45) and a Fußstützrohrsegment (44), further comprising the seat foot support frame (6) has a transverse strut (9) connecting the struts (7, 8), - Two coupling units (13) connecting the base frame (2) in the left and right front area with the seat foot support frame (6) in the region of the left and right Fußstützrohrsegmente (44) about an axis vertically to a sagittal plane for an angular adjustment, and in which the Fußstützrohrsegmente (44) are adjustably mounted for a seat height adjustment, a left frame connector (11) and a right frame connector (12), said frame connectors (11, 12) rigidly connecting said base frame (2) and said seat tube segments (45), said seat tube segments (45) being in different positions with said Frame connectors (11, 12) are connectable. Wheelchair according to claim 1, characterized in that the Fußstützrohrsegmente (44) in the coupling units (13) are infinitely or gradually adjustable. Wheelchair according to claim 1 or 2, characterized in that the respective Fußstützrohrsegment (44) in a sleeve designed as a coupling piece (24) of the coupling unit (13) slidably mounted and by means (25 to 31), in particular clamping means, with respect to the coupling piece (24) can be fixed. Wheelchair according to one of claims 1 to 3, characterized in that the respective side strut (3, 4) has a strut tube (22) and a fixedly connected to this multifunction part (23), wherein the respective multi-functional part (23) receiving the bearing seats for a steering fork (52) of a front wheel (17) and the bearing of the coupling unit (13), preferably also the inclusion of a shock protection (32) is used. Wheelchair according to one of claims 1 to 4, characterized in that the two frame connectors (11, 12) connect the base frame (2) and the seat tube segments (45) firmly in their respective rear region. Wheelchair according to one of claims 1 to 5, characterized in that the seat tube segments (45) receive in the rear region of a further transverse strut (10) movable, said cross strut (10) in the region of the opposite ends with the frame connectors (11, 12) connected is. Wheelchair according to one of claims 1 to 6, characterized in that the respective frame connector (11, 12) is designed as a plate, which is arranged in particular parallel to the sagittal plane. Wheelchair according to one of claims 1 to 7, characterized in that the respective frame connector (11 or 12) by means of at least one connecting element (36) fixedly connected to the rear axle (5), in particular screwed. Wheelchair according to one of claims 1 to 8, characterized in that the respective frame connector (11 or 12) has a slot (48) which inclined to a neighboring oblong hole (46) of the corresponding seat tube segment (45), and means (38, 39, 40, 41) for fixing frame connectors (11 or 12) and seat tube segment (45) the oblong holes (46, 48) enforce, for fixing respective frame connector (11 or 12) and associated seat tube segment (45) in different positions. Wheelchair according to claim 9, characterized in that the slot (48) of the frame connector (11 or 12) from above, in particular slightly above the rear axle (5) extends obliquely forward above and / or the slot (46) of the seat tube segment (45 ) extends in the axial direction of the seat tube segment (45). Wheelchair according to claim 9 or 10, characterized in that the slot (48) of the frame connector (11 or 12) is slightly curved and the slot (46) of the seat tube segment (45) straight, in the axial direction of the seat tube segment (45) extending, is arranged , Wheelchair according to one of claims 1 to 11, characterized in that the frame connector (11 or 12) and the seat tube segments (45) are connected to each other continuously or in defined Verstellabständen. Wheelchair according to one of claims 1 to 12, characterized in that the rear axle (5) for adjustability of the wheelbase of the wheelchair (1) on the side struts (3, 4) displaceable and by means of the side struts (3, 4) can be fixed.

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