EP2394622B1 - Wheel suspension device and wheelchair with same - Google Patents

Description

The present invention relates to a, in particular height-adjustable, suspension device and a wheelchair with such a device, in particular in addition to a height adjustment for a seat also allows a seat center of gravity.

Wheel suspensions for wheelchairs are known from the prior art. For example, the EP 1 839 637 A1 a wheel suspension for a wheelchair with at least one set of two in a vertical plane successively arranged wheels. Here, the front wheel with respect to the direction of travel is a Steigrad which has a distance from a driving plane, and the rear wheel is a supporting wheel. In each set of wheels, the Steigrad and the supporting wheel are mounted separately on a first and second fork element, wherein these fork elements are arranged on a common clevis. From the suspension spring means are included, so that the pivotal movement of a fork element are transmitted to the other fork element.

An alternative suspension is known, for example, from the applicant's wheelchair marketed under the trade name Helium®. This suspension is in FIG. 8 shown. Said known suspension 1 off FIG. 8 is provided by means of milled profiles and comprises a first attachment means 3 for at least one supporting wheel or drive wheel and a second attachment means 5 for at least one further wheel or support wheel. A third fastening device 7 for mounting the suspension on a not shown frame of the wheelchair is provided at the fastening means 3, 5 opposite end of the suspension 1.

A disadvantage of the devices known from the prior art is that they are associated with a high weight and high production costs. In addition, fasteners such as screws, which also open adjustment, visible from the outside and accessible, which can not only be rated as unattractive, but can lead to undesirable adjustments.

The object of the present invention is therefore to provide a suspension device which overcomes the disadvantages of the prior art, in particular is lightweight and inexpensive and whose fasteners are not visible from the outside.

• das zweite Verbindungselement eine translatorische Bewegung entlang einer schiefen Ebene relativ zu dem dritten Verbindungselement innerhalb des ersten Verbindungselements und durch dieses beschränkt so durchführen kann, dass eine Arretierung des ersten Verbindungselements mit dem zweiten und dritten Verbindungselement bereitstellbar ist, und
• das zweite und dritte Verbindungselement lösbar miteinander verbindbar sind mittels zumindest eines Befestigungselements, das eine Kraft entlang einer Achse bereitstellt, die in besagter translatorischer Relativ-Bewegung des zweiten und dritten Verbindungselements entlang der schiefen Ebene resultiert.

This object is achieved by a wheel suspension device for a wheelchair, comprising at least three connecting elements, of which a first connecting element can surround a second and a third connecting element at least partially in the region of a recess, wherein

• the second connection element can perform a translatory movement along an inclined plane relative to the third connection element within the first connection element and limited by the latter such that a locking of the first connection element with the second and third connection element can be provided, and
• the second and third connection members are releasably connectable to each other by means of at least one fastener that provides a force along an axis resulting in said translational relative movement of the second and third fasteners along the inclined plane.

It is preferred that the second connecting element has a recess in which the fastening element, in particular in the form of a screw, a threaded rod or the like, with a translational movement component along the inclined plane is movable, and the third connecting element has a further recess for receiving in regions of the fastener.

It can also be provided that the recess of the second connecting element is aligned with the recess of the third connecting element, preferably both recesses concentric with the axis, which in turn coincides with the, in particular in a wheelchair vertically extending, longitudinal axis of the first connecting element.

According to the invention, it can be provided that the movement of the fastening element along the axis into the first connecting element is spatially limited by means of a geometric configuration at the end of the fastening element facing away from the first connecting element, wherein the formation preferably comprises a screw head.

Furthermore, it can be provided that the second connecting element in the region of its recess comprises an internal thread to provide a positive connection with an external thread of the fastening means, wherein preferably the thread pitch is adapted to the inclined plane.

In addition, it is proposed that the inclined plane is inclined relative to the axis at an angle of at least 5 °, preferably greater than or equal to 7 °, wherein preferably the angle can be determined depending on the geometry of the connecting elements and / or material properties of the connecting elements, in particular depending on a static and / or sliding friction of the second and third connecting element.

According to the invention it is further preferred that the first connecting element at least a first attachment means for attachment to a frame of a wheelchair, in particular for receiving a frame member, such as a frame tube, and / or at least a second attachment means for attachment to a cross brace of the wheelchair, in particular for Inclusion of a crossbar tube, provided.

In addition, it is preferably provided that the third connecting element at least a third fastening means for attaching at least one wheel of the wheelchair, in particular for Receiving a wheel axle, provides, wherein preferably at least two openings are provided by the third connecting element, which are in particular connected via a slot, and wherein preferably in one of the two openings a wheel axle and in the respective other a supporting sleeve optionally at least partially be introduced ,

According to the invention it is preferred that the first connecting element has a T-shape, and / or the first fastening means for the frame of the wheelchair in a first direction, in particular the horizontal, and the receptacle for the second and third connecting element in a second direction, in particular the vertical extends, wherein preferably the vertical extent of the receptacle is limited by a stop, by which the distance between the first and the third fastening means can be limited

It can also be provided that the third fastening means extends in a third direction, in particular the horizontal, preferably perpendicular to the first fastening means.

Furthermore, it is preferred that at least one spacer element is insertable into the receptacle of the first connecting element, wherein preferably the spacer abuts on the one hand the stop and on the other hand the second connecting element, and / or at least one spacer element can be arranged between the first connecting element and the third connecting element, to adjust the distance between a drive wheel of the wheelchair, in particular with a first height determined by the third fastening means, and a seat of the wheelchair, in particular with a second height determined by the first fastening means.

It can also be provided that the second and / or third connecting element comprises or comprise a scale that is representative of the insertion depth of the second and third connecting element into the first connecting element.

It is also proposed that at least one, preferably each, of the three 1 connecting elements is made by gravity casting.

In addition, it is an object of the present invention to provide a wheelchair which overcomes the disadvantages of the prior art. This wheelchair should be particularly light and inexpensive. It should also have an attractive design, in which as few fasteners are visible from the outside. Furthermore, the wheelchair should allow a quick adjustment of the height of his seat and its center of gravity.

This object is achieved by a wheelchair comprising a frame, a seat, two drive wheels and two suspension devices according to the invention.

It is preferred that a seat height on the arrangement at least one spacer elements per suspension device between the respective first connecting element and the respective third connecting element is adjustable.

Finally, the invention also proposes that a focus on the change in the relative position of each suspension device to the frame is adjustable, preferably via different attachment positions of the first connecting element, in particular its first fastening means on a frame member, and / or a focus on the change of Relative position of each Radaufliängungs device is adjustable to the wheel axle of the drive wheels, preferably on the alignment of the third connecting elements to the frame and / or the arrangement of the wheel axle of the drive wheels in a selected opening of a plurality of openings of the third connecting element of Radaufliängungs device.

The invention is therefore based on the surprising finding that a lightweight and inexpensive wheel suspension for a wheelchair can be realized by a device with connecting elements, which are firmly connected to each other by means of adhesion by contact forces, so that a releasable connection is provided by means of stiction. It has proved to be particularly advantageous if a first, in particular T-shaped, connecting element at least partially surrounds at least partially further regions for providing the releasable connection at its one, in particular vertically extending, end and a translational movement or Displacement of the second connecting element along an inclined plane of the third connecting element allows a fixation. The translational movement is spatially limited by the at least partially enclosing the second and third connecting element by the first connecting element, so that a force is generated, which in turn leads to adhesion of the second and third connecting element to the first connecting element. Since the direction of said force is at least partially converted via a force vector into a resulting further force, the point of application of which acts perpendicular to the region of the limitation of the translatory movement by the first connecting element, a fixed connection of all three connecting elements by means of static friction arises.

In addition, the second and third connecting element are releasably connected to each other via a fastening element which, preferably in the form of a screw, a threaded rod or the like, by means of a recess in the third and the second connecting element allows a connection of the third connecting element with the second connecting element. The fastener is limited in its inclined to the inclined plane of the translational movement, preferably vertically extending direction with respect to the recess in the third connecting element. This limitation is preferably effected by an axial limitation of the fastening element in the direction of the force which is provided by widening and / or shaping of the fastening element at at least one end. As a result of this limitation of the movement of the fastening element, a force occurring perpendicularly with respect to the axis of the recess is at least partially converted into a force vector running perpendicular thereto, that is to say in particular horizontally, such that the translational movement of the second connecting element takes place along the inclined plane with respect to the third connecting element , In order to enable such a translational movement, the recess in the third connecting element is preferably elongated and formed at a first angle relative to the inclined plane.

The perpendicular or axial force along the axis of the fastener leads to a translational movement thereof within the recess along this axis. This is preferably realized such that a screw head or the like limits the movement of the fastening element as an axial stop. A thread of the screw allows by an internal thread in the third connecting element a positive connection of the fastening element with the third connecting element, so that a rotation of the screw in a certain direction leads to a relative displacement of the second connecting element along the inclined plane, and so on until the spatial boundary of the third connecting element prevents this displacement and the horizontal force component of a resulting vector leads to a secure fixing of the first to the second and third connecting element. The fixation is made possible in that the outer thread of the screw and the inner thread of the third connecting element in the axial direction are positively and also the connection between the screw shaft and the second fastening element, with the exception of the translational movement within the recess forms. In this case, the thread represents another inclined plane which is wound helically around the shank of the screw. Due to the wedge effect, a small circumferential force when tightening the screw increases to a large axial force and a large rotation results in a small axial movement and thus in a small relative translational movement of the third relative to the second connecting element. Consequently, a rotational movement of the screw into a clearly defined adhesion of the second and third connecting element as well as in the region in which the first connecting element encloses the second and the third connecting element, can create an adhesion of the three connecting elements, wherein the angle of the inclined plane the division of the vectors of the forces determined both between the first and the second and third and between the second and third connecting elements.

Preferably, the angle that is representative of the relative position of the inclined plane to the direction of the translational movement of the second s with respect to the third connecting element is greater than or equal to 7 °. A smaller second angle would lead to an excessive proportion of the vertical force component of the force vectors of the first force, so that a relative displacement of said connecting elements would no longer be possible. In particular, however, it is provided, the angle as a function of material-specific Properties, in particular the static friction, rolling friction and / or the geometric shape of the second and the third and / or the first connecting element to choose.

Furthermore, it is particularly advantageous if the shape of the connecting elements at least partially forms a round profile, a triangular profile, a quadrilateral profile or an octagonal profile and the connecting elements are formed as a hollow profile or as a solid profile, wherein the connecting elements may comprise in particular castings, are preferably made by means of chill casting. Of course, all other N-corner profiles are conceivable, so that the above list is to be understood merely as an example.

The first connecting element may also receive a wheelchair frame element, preferably a tubular element, perpendicular to the direction of movement of the fastening element, in particular in a horizontal direction, while the third connecting element may substantially receive a wheel axle in a plane parallel thereto. The wheel axle preferably runs perpendicular to the wheelchair frame element.

By a device according to the invention for connecting elements of a suspension, a significant reduction in manufacturing costs can be achieved. In addition, the device according to the invention saves space, and the fastening elements are arranged in the interior of the device, which opens up more design freedom for the wheelchair using the wheelchair.

By choosing an N-corner profile for the outer surface of the second and third connecting element and the inner surface of the first connecting element can also be made by rotation of the second and third connecting element relative to the first connecting element in a simple way a seat center of gravity. Thus, the third connection element can be fixed with different relative positions for a Radachsenanbringung in the first connection element. If, for example, the third connecting element provides a plurality of wheel receiving openings, the choice of one of these makes it possible to set a seat center of gravity.

However, a seat center of gravity adjustment is also possible by different relative positions for the attachment of the device according to the invention to the wheelchair frame element. Thus, on the one hand, the device according to the invention can be fastened at different positions along a tubular wheelchair frame element. On the other hand, the device according to the invention can be pushed in two different positions on a tubular tubular frame member, said positions differ by a rotation of 180 ° degrees from each other.

In addition, for a height adjustment, "spacers", ie spacers or spacer elements, can be arranged within the first connecting element, so that the insertion depth of the second and third connecting element into the first connecting element is limited in a well-defined manner. Optionally, spacer elements can also be arranged between a first connection element and a third connection element. Thus, the relative distance between the wheelchair frame element and the wheel axle is variable, wherein the respective height fixing is also realized via the fastening element. Thus, if a wheelchair is delivered with a set of different height spacers, an individual height adjustment can be made in a simple manner and reproducibly by selective selection of a spacer per device.

Figur 1:

eine perspektivische Teilschnittansicht einer ersten erfindungsgemäßen Vorrichtung;

Figur 2:

eine Explosionszeichnung der Vorrichtung von Figur 1;

Figur 3:

eine vereinfachtes Kräftediagramm einer der Vorrichtung, der Figuren 1 und 2;

Figur 4:

eine perspektivische Teilschnittansicht einer zweiten erfindungsgemäßen Vorrichtung;

Figur 5:

eine Explosionsansicht der Vorrichtung von Figur 4;

Figur 6:

eine Explosionsansicht der Vorrichtung der Figuren 4 und 5 in Kombination mit einem Rollstuhlrahmenelement;

Figuren 7a bis 7b:

Ansichten unterschiedlicher Verbindungen der erfindungsgemäßen Vorrichtung der Figuren 4 bis 6 mit einem Rollstuhlrahmenelement zur Veranschaulichung einer Sitzschwerpunkteinstellung; und

Figur 8:

eine perspektivische Teilansicht einer bekannten Radaufhängung.

Further features and advantages of the invention will become apparent from the following description in which an embodiment of a device according to the invention is explained in detail. Showing:

FIG. 1:

a partial perspective sectional view of a first device according to the invention;

FIG. 2:

an exploded view of the device of FIG. 1 ;

FIG. 3:

a simplified force diagram of the device, the Figures 1 and 2 ;

FIG. 4:

a partial perspective sectional view of a second device according to the invention;

FIG. 5:

an exploded view of the device of FIG. 4 ;

FIG. 6:

an exploded view of the device of FIGS. 4 and 5 in combination with a wheelchair frame element;

FIGS. 7a to 7b:

Views of different compounds of the device of the invention FIGS. 4 to 6 with a wheelchair frame member to illustrate a seat center of gravity adjustment; and

FIG. 8:

a partial perspective view of a known suspension.

In FIG. 1 a device 20 according to the invention for attachment of (drive) wheels (not shown) to a wheelchair (not shown) is shown. This device 20 comprises three connecting elements 30, 32 and 34, each consisting of a hollow profile. A first connecting element 34 is substantially T-shaped and has a first fastening means 38 8 in the form of a first, horizontally extending, recess for receiving a frame element of the wheelchair and a second fastening means 39 in the form of a second vertically extending recess for receiving the second and third Connecting element 30, 32 on. The introduced into the first connecting element 34 connecting elements 30, 32 are clamped to the first connecting element 34. By means of this bracing, it is possible to arrange third fastening means 40, 40 'in the form of brackets of cross braces (not shown) of the wheelchair on the outside of the first connecting element 34 in a space-saving manner. The third connecting element 30 has a fourth fastening means 42 in the form of a recess for receiving a wheel axle of the wheelchair and a fifth fastening means 44 for receiving an additional wheel, in particular jockey wheel. However, the fifth attachment means 44 can also serve as an alternative for the fourth attachment means 42 for receiving the wheel axle, so that therefore a choice is made with respect to the relative position of the wheel axle to the device 20 for adjusting the center of gravity. In the in FIG. 1 As shown, however, the fourth fastening means 42 is designed for receiving the wheel axle, while in the fifth fastening means 44, a sleeve 44 'is attached for stability reasons.

The wheel axle and the axis of the preferably tubular frame element extend in essentially parallel planes, but perpendicular to one another.

In FIG. 2 it can be seen that the second connecting element 32 is displaceable along an inclined plane 33 relative to the third connecting element 30. Preferably, the first and third connecting element 34, 30 are formed such that the inclined plane 33 forms an angle of at least 7 ° with the axis 35 of the first connecting element 34. By way of example, the second and third connecting elements 30, 32 are formed with an octagonal solid profile, while the first connecting element 34 has an octagonal hollow profile at least in regions, so that the first connecting element 34 at least partially surrounds the second and third connecting elements 30, 32 as in FIG. 1 shown. The profile configurations allow different relative rotations between the first connecting element 34 on the one hand and the second and third connecting element 30, 32 on the other hand, which will be discussed later in connection with a focus adjustment.

A fastener 36 in the form of a screw can in FIG. 2 vertically from below through a, preferably oblong, recess (not shown) through the third connecting element 30 substantially parallel to the axis 35, in such a way that a geometric formation 37, in particular a screw head, as an axial boundary, the displacement the fastening element 36 spatially limited. The screw head 37 has a larger circumference than the recess (not shown) in the third connecting element 30, so that it rests on the third connecting element 30. The second connecting element 32 likewise comprises an internal thread (not shown), which can receive the fastening element 36, which allows a positive connection between the fastening element 36 and the second connecting element 32. Is now by rotation of the fastener 36, an axial displacement of the fastener 36 in FIG. 2 generated upward, the distance between the screw head 37 and the third and the second connecting element 30, 32 is shortened in that a relative translational movement of the second connecting element 32 along the inclined plane 33 takes place. The force generated by the rotation of the fastener 36 is thus divided into a resultant horizontal and a resultant vertical or axial force vector. Once the translational movement of the second connecting member 32 is limited by the first connecting member 34, adhesion between the three Connecting elements 30, 32, 34 generated, which ensures a secure connection between these three levels. This connection is achieved by an inverse rotation of the fastening element 36, since the distance between the geometric shape 37 and the second connecting element 32 increases.

In addition, it can not come to an accidental height adjustment or solution of the connection of the elements 30, 32 and 34, since the screw 36 is not visible from the outside.

In FIG. 3 a simplified force diagram of a device according to the invention is shown. A tensile force 60 is provided by means of a fastener 36 '. The tensile force 60 is divided into forces 62, 64, 66 due to an inclined plane 33 ', the forces 62 and 64 leading to a first adhesion between connecting elements 30', 32 '. The force 66 leads to a displacement of a third connecting element 32 'along the inclined plane 33', until this movement is prevented by a first connecting element 34 '. In this state, a force 68 counteracts the force 66 and results in a second adhesion of the first and third connection elements 32 ', 34'. A variation of the force 60 thus acts both on the first adhesion produced by the forces 62 and 64 between the second and third connecting elements 30 ', 32' and on their second adhesion to the first connecting element 34 '. A ratio between the distribution of the force 60 on the first and second adhesion is determined by an angle 70.

It is also essential to the invention that the device 20 according to the invention also has an especially elegant way of adjusting the distance between the wheel axle, which extends through the opening 42 in the installed state, from the frame element of the wheelchair, which extends through the recess 38 in the installed state Height adjustment of the wheelchair allows. In this case, spacers can be used. Thus, a wheelchair may be delivered with a plurality of differently dimensioned spacers so that a particular spacer for a wheelchair user may be selected per device of the invention, two of which must be present in each wheelchair, to be inserted into the recess 39 of the first connector 34 until the spacer contacts a stopper 50 in the recess 39. Then the second and third Connecting element 30, 32 existing unit in the first connection means 34, so the recess 39 are inserted, wherein the spacer is set by the spacer. The fixation of the three connecting elements 30, 32, 34 then proceeds as described above. In other words, regardless of the desired height, a fixation via the screw 36 is always possible, resulting in the reduction of the required components and an optimized optics, since the spacers are not visible in the assembled state of a wheelchair, they, as well as the unit from the second and third fastening elements 30, 32 is located within the first fastening element 34. Thus, the design of the first attachment element 34 for the optics of the device according to the invention thus also the wheelchair is crucial.

Alternatively to that with reference to the FIGS. 1 to 4 described devices of the invention will be described with reference to the FIGS. 4 to 7b A second device 200 according to the invention is described which, like the first device according to the invention, has three connecting elements 300, 300 ', 320, 340. So is in FIG. 4 to see the device 200 according to the invention in the assembled state, in which the first connection element 340, the second connection element 320 completely and the third connection element 300 partially receives. In addition is FIG. 4 the use of two spacers 250 between the first connecting element 340 and the second connecting element 300, via which a seat height adjustment is possible, and when a fastening means 380 of the first connecting element 340 on a in FIG. 4 not shown frame member is applied, which in turn is arranged relative to a seat, while in one of two openings 410, 410 'of the third connecting element 300 extends a wheel axle, not shown. Finally, in FIG. 4 two fasteners 400 and 400 'for a cross strut, not shown, a folding wheelchair on the first connecting element 340 shown.

The exploded view of FIG. 5 The relative movability of the second connecting element 320 can be taken along an inclined plane 330 to the third connecting element 300.

As FIG. 6 can be removed, the device 200 according to the invention via two screws 801, 801 'with a frame member 800 of a wheelchair connectable. For this purpose, the fastener 380 is slid onto the frame member 800 and aligned with threaded holes (not shown) therein so that the screws 801, 801 'can then be tightened.

Furthermore, the third connecting element can be inserted in one of two positions together with the second connecting element 320 in the first connecting element 340, wherein these two positions in FIG. 6 are denoted by the reference numerals 300 and 300 'and differ from each other by a 180 degree rotation. Further, optionally, one, two or three spacers 250 may be arranged between the first and third connectors 300, 340. In addition, the connecting elements 300, 320, 340 can be fixed relative to one another via a fastening element 360 in the form of a screw. Finally, the selection of an opening 410 for a wheel axle is still possible, wherein in the respectively unselected opening 410 ', a sleeve 415 is inserted.

In the FIGS. 7a and 7b different arrangements of the various components of the device 200 according to the invention are shown. More specifically, the four representations of the Figure 7a from the four representations of the FIG. 7b in that the first connecting element 340 is fastened to the frame element 800 at two different positions. Since the frame element 800 has a plurality of threaded openings, a screwing of the first connecting element 340 to the frame element 800 is possible, for example in two positions, wherein the in FIGS. 7a shown position closer to a backrest, not shown, as in the FIGS. 7b shown position.

The different representations of the Figure 7a differ from each other in two ways. In the representations of FIGS. 7a i) and 7a ii) is the relative orientation of the first connecting element 340 by 180 ° degrees relative to the relative position in the representations of FIGS. 7a (iii) and 7a (iv) rotated, so that different relative positions for the attachment of a wheel axle, which in turn allows a focus adjustment.

The presentation of the FIGS. 7a i) and 7a ii) differ by the choice of the opening 410 for the wheel axle from each other. More specifically, the two openings 410 and 410 'are interconnected by a slot 411, and for stability reasons, a sleeve 415 is inserted in the opening 410' into which the wheel axle is not to be inserted. The FIGS. 7a (iii) and 7a (iv) differ in a similar way as the FIGS. 7a i) and 7a ii) from each other.

The different representations of the FIG. 7b have the same differences as related to Figure 7a on the one hand with respect to the alignment of the first connecting element 340 to the frame member 800 and on the other hand, the selection of one of the two openings 410 for a wheel axle.

Overall, the clarify FIGS. 7a to 7b Thus, eight different ways of attaching a wheel axle relative to a frame member 800 by the device 200 according to the invention are provided. There are thus eight focus settings available.

In summary, it can thus be stated that the device according to the invention opens up a simple height adjustment via the spacers 250 and, via the attachment of the device 200 according to the invention to the frame element 800 and the wheel axle on the device 200 according to the invention.

LIST OF REFERENCE NUMBERS

1

Arm

3, 5, 7

fastening device

20

connecting device

30, 30 ', 32, 32'

connecting element

33, 33 '

Inclined plane

34, 34 '

connecting element

35, 35 '

axis

36, 36 '

fastener

37, 37 '

geometric shape

38, 39, 39 ', 40, 40', 42, 44

fastener

44 '

shell

45 ', 46'

recess

47 '

attack

50

attack

60

traction

62, 64, 66, 68

force

70

angle

200

connecting device

250

spacer

300, 320

connecting element

330

inclined plane

340

connecting element

360, 380

fastener

390

recess

400, 400 ', 410, 410'

fastener

411 1

slot

415 5

shell

800

frame element

801.801 '

fastener

Claims (16)

1. A wheel suspension device (20, 200) for a wheelchair, comprising at least three connecting elements (30, 30', 32, 32', 34, 34', 300, 300', 320, 340), of which
   a first connecting element (34, 34', 340) is able to enclose at least parts of a second and a third connecting element (30, 30', 32, 32', 300, 300', 320) in the area of a recess (39, 39', 390), wherein

   • the second connecting element (32, 32', 320) is capable of translational movement along an inclined plane (33, 330) relative to the third connecting element (30, 30', 300, 300') within the first connecting element (34, 34', 340) and restricted by said first connecting element, in such a manner that the first connecting element (34, 34', 340) can be interlocked with the second and third connecting elements (30, 30', 32, 32', 300, 300', 320), and

   • the second and third connecting elements (30, 30', 32, 32', 300, 300', 320) can be releasably connected to each other by means of at least one fastening element (36, 36', 360) that provides a force (60) along an axis (35, 35'), which results in said relative translational movement of the second and third connecting elements (30, 30', 32, 32', 300, 300', 320) along the inclined plane (33, 33', 330).
2. The wheel suspension device according to Claim 1, characterized in that the second connecting element (32, 32', 320) has a recess (46'), in which the fastening element (36, 36', 360), in particular in the form of a screw, a threaded rod or the like, can be moved along the inclined plane (33, 33', 330) with a translational motion component, and
   the third connecting element (30, 30', 300, 300') has another recess (45') for partly receiving of the fastening element (36, 36', 360).
3. The wheel suspension device according to Claim 2, characterized in that the recess (46') of the second connecting element (32, 32', 320) is flush with the recess (45') of the third connecting element (30, 30', 300, 300'), wherein preferably both recesses (45', 46') extend concentrically with the axis (35, 35'), which on its part coincides with the longitudinal axis, which is in particular vertical in a wheelchair, of the first connecting element (34, 34', 340).
4. The wheel suspension device according to any one of the preceding claims, characterized in that
   movement of the fastening element (36, 36', 360) along the axis (35, 35') into the first connecting element (34, 34', 340) is spatially limited by means of a geometric shape (37, 37') on the end of the fastening element (36, 36', 360) that faces away from the first connecting element (34, 34', 340), wherein said shape (37, 37') preferably comprises a screw head.
5. The wheel suspension device according to any one of the preceding claims, characterized in that
   the second connecting element (32, 32', 320) comprises an internal thread in the area of its recess (46') in order to provide a form-fit connection with an external thread of the fastening means (36, 36', 360), wherein preferably the thread pitch is adapted to the inclined plane (33, 33', 330).
6. The wheel suspension device according to any one of the preceding claims, characterized in that
   the inclined plane (33, 33', 330) is inclined at an angle (70) of at least 5°, preferably greater than 7°, relative to the axis (35, 35'), wherein preferably the angle (70) can be determined in accordance with the geometry of the connecting elements (30, 30' 32, 32', 34, 34', 300, 300', 320, 340) and/or material properties of the connecting elements (30, 30', 32, 32', 34, 34', 300, 300', 320, 340), in particular in accordance with a stiction and/or sliding friction of the second and third connecting elements (30, 30', 32, 32', 300, 300', 320).
7. The wheel suspension device according to any one of the preceding claims, characterized in that
   the first connecting element (34, 34', 340) provides at least one first fastening means (38, 380) for attachment to a frame of a wheelchair, in particular for receiving a frame element (800), such as a frame tube, and/or at least one second fastening means (40, 40', 400, 400') for attachment to a diagonal brace of the wheelchair, in particular for receiving a diagonal-brace tube.
8. The wheel suspension device according to any one of the preceding claims, characterized in that
   the third connecting element (30, 30', 300, 300') provides at least one third fastening means (42, 44, 410, 410',411) for attachment of at least one wheel of the wheelchair, in particular for receiving a wheel axle, wherein preferably the third connecting element (300, 300') provides at least two openings (410, 410'), which are in particular connected to each other by means of a slit (411), and optionally at least part of a wheel axle can be inserted in one (410) of the two openings and at least part of a supporting sleeve (415) can be inserted in the other (410').
9. The wheel suspension device according to Claim 7 or 8, characterized in that the first connecting element (34, 34', 340) is T-shaped, and/or the first fastening means (38, 380) for the frame of the wheelchair extends in a first direction, in particular in the horizontal direction, and the receiving element (39, 39', 390) for the second and third connecting elements (30, 30', 32, 32', 300, 300', 320) extends in a second direction, in particular in the vertical direction, wherein preferably the vertical extent of the receiving element (39, 39', 390) is limited by a stop (47') that can be used to limit the distance between the first and the third fastening means (38, 42, 44, 380, 410, 410').
10. The wheel suspension device according to Claim 8 or 9, characterized in that the third fastening means (42, 44) extends in a third direction, in particular in the horizontal direction, preferably at right angles to the first fastening means (38).
11. The wheel suspension device according to any one of the preceding claims, characterized in that
    at least one spacer can be inserted in the receiving element (39, 39') of the first connecting element (34, 34'), wherein preferably the spacer contacts the stop (47') on one side and the second connecting element (32') on the other side, and/or at least one spacer (250) can be arranged between the first connecting element (340) and the third connecting element (300, 300') in order to adjust the distance between a drive wheel of the wheelchair, in particular at a first height determined by the third fastening means (42, 44, 410, 410'), and a seat of the wheelchair, in particular at a second height determined by the first fastening means (38, 380).
12. The wheel suspension device according to any one of the preceding claims, characterized in that
    the second and/or the third connecting element (30, 32, 300, 300', 320) comprise(s) a scale that represents the depth to which the second and third connecting elements (30, 32, 300, 300', 320) are inserted in the first connecting element (34, 34', 340).
13. The wheel suspension device according to any one of the preceding claims, characterized in that
    at least one, preferably each, of the three connecting elements (30, 30', 32, 32', 34, 34', 300, 300', 320, 340) is made by permanent mold casting.
14. A wheelchair comprising a frame, a seat, two drive wheels and two wheel suspension devices according to any one of the preceding claims for said two drive wheels.
15. The wheelchair according to Claim 14, characterized in that
    a seat height can be adjusted by means of at least one spacer (250) per wheel suspension device (20, 200) between the first connecting element (34, 34') and the third connecting element (30, 30', 300, 300') in each case.
16. The wheelchair according to Claim 14 or 15, characterized in that a center of gravity can be adjusted by adjusting the relative position of each wheel suspension device (20, 200) to the frame, preferably by means of different fastening positions of the first fastening means (38, 380') of the first fastening element (34, 340) on a frame element (800), and/or a center of gravity can be adjusted by adjusting the relative position of each wheel suspension device (20, 200) to the drive wheels, preferably by means of aligning each wheel suspension device (20, 200) with the frame and/or arranging the wheel axle of the drive wheels in a selected opening (410) of a plurality of openings (410, 410') of the third connecting element (300, 300') of each wheel suspension device.

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