wheelchair wheel

Abstract

wheelchair wheel (1), which is rotatable about a pivot axis (2), with a hub (3) which can be connected to a wheel axle (18) of a wheelchair frame, with a wheel body arranged on the hub (3), forming a running surface (12) of the wheelchair wheel (1) and representing the connection between the running surface (12) and the hub (3), which is composed of three wheel body sectors (5, 6, 7), wherein each wheel body sector (5, 6, 7) is equipped with a rim profile (19) and with a tire section (20) arranged in the rim profile (19), characterized in that the wheelchair wheel is equipped with three independent fastening devices (8, 9, 10), wherein each wheel body sector (5, 6, 7) is detachably attached to the hub (3) by one of the fastening devices (8, 9, 10).

Description

[0001] The invention is based on a wheelchair wheel with a hub and a wheel body arranged on the hub, which forms a running surface of the wheelchair wheel and represents the connection between the hub and the running surface.

[0002] Wheelchairs are used by people with limited mobility. Typically, a wheelchair has a frame with a seat, two large, self-propelled wheels, and two much smaller front wheels. Each wheelchair wheel has a hub that can rotate relative to a wheel axle. The wheelchair wheel is mounted on the frame with the wheel axle for rotation.

[0003] From the prior art of EP 3 222 263 A1, a wheelchair wheel is known which is rotatable about a rotational axis, having a hub which is connectable to a wheel axle of a wheelchair frame, and having a wheel body arranged on the hub, forming a tread of the wheelchair wheel and representing the connection between the tread and the hub. The wheel body is composed of three wheel body sectors, each wheel body sector being equipped with a rim profile and a tire section arranged in the rim profile. The three wheel body sectors are detachably attached to the hub by means of a rotary knob. To make it easier for a person with limited mobility to transfer from the wheelchair seat to a toilet, chair, or bed, one of the three wheel body sectors of the wheelchair wheel can be detached from the hub. The other two wheel body sectors are intended to remain attached to the hub and thus to the wheelchair.All three wheel body sectors are held to the hub by a single fastening device. To release a wheel body sector, the turning knob on the fastening device must be moved to a specific position that releases the upward-facing wheel body sector. This is difficult for the person sitting in the wheelchair, as the turning knob on the side of the wheelchair is only visible from above. The same applies to the subsequent reinstallation of the wheel body sector on the wheelchair wheel, as to install the wheel body sector, the turning knob must be turned in the same direction as for removal. Furthermore, the fastening device, which is common to all three wheel body sectors, poses the risk that it is not the upward-facing wheel body sector that comes loose from the hub, but rather one of the other two wheel body sectors. In this case, the wheelchair could tip over.

[0004] DE 10 2011 103 203 A1 discloses a foldable balance bike for a wheelchair, bicycle, stroller, or the like. The balance bike has a two-part wheel body. The two parts are connected to each other via a detachable fastening device in a force-locking and / or form-locking manner. During transport or storage, the balance bike is folded, thus requiring less storage space.

[0005] Also known from DE 10 2011 103 207 A1 is a foldable or collapsible balance bike with two partial bodies for a wheelchair, which has a small surface area when folded and thus takes up less storage space during transport and storage.

[0006] The invention is based on the object of providing a wheelchair wheel with three wheel body sectors in which the risk of unwanted release of one or more wheel body sectors is reduced and in which the targeted release of individual wheel body sectors is also made easier for a person with walking restrictions.

[0007] This problem is solved by a wheelchair wheel having the features of claim 1. The wheelchair wheel is characterized by being equipped with three independent fastening devices. Each of the three wheel body sectors is releasably attached to the hub with one of the three fastening devices. By releasing one of the three fastening devices, only the wheel body sector secured with this particular fastening device can be removed from the hub. The other two fastening devices are not affected by this, so that the wheel body sectors secured to the hub with them remain reliably fixed to the hub.

[0008] Since exactly one fastening device is provided for each wheel body sector, which is independent of the other two fastening devices, it is easier for the user to assign one of the wheel body sectors that he wants to remove to the corresponding fastening device.

[0009] To remove a wheel body sector from the wheelchair wheel, the fastening device with which this wheel body sector is attached to the hub is loosened. For this purpose, the fastening device is preferably equipped with a manually operated handle. By operating this handle, the fixation of the wheel body sector to the hub is released, so that the wheel body sector can be removed from the hub and the two other wheel body sectors. The user simply has to select the wheel body sector they wish to loosen. For a person sitting in a wheelchair who wishes to transfer to another seat, the selected wheel body sector is preferably aligned upwards on the wheelchair wheel facing the seat. The wheelchair can be locked in the position set by the person for this purpose so that it does not roll away unintentionally and the selected wheel body sector remains in the set orientation.To release the selected wheel body sector, the user operates the fastening device associated with that wheel body sector. A corresponding handle is preferably located on the outside of the wheelchair wheel in the area of ​​the selected wheel body sector. The association between a wheel body sector and the fastening device with which this wheel body sector is attached to the hub is thus clear and unambiguous. This makes releasing the selected wheel body sector with the corresponding fastening device clear and unambiguous, even if the user can essentially only see the wheelchair wheel from above.

[0010] Installing a wheel center sector into the wheelchair wheel is also quick and easy. To do this, the wheel center sector is inserted into the space provided for it on the wheelchair wheel. Once the wheel center sector is positioned on the hub, it is secured using the fastening device located on the hub in the area designated for the wheel center sector.

[0011] For transport or storage of the wheelchair or wheelchair wheel, all three fastening devices can be loosened and the corresponding wheel body sectors can be removed from the hub.

[0012] Advantageously, the three wheel body sectors and the three fastening devices are identical in design. This means that each wheel body sector fits into each fastening device.

[0013] According to an advantageous embodiment of the invention, the three fastening devices on the hub are arranged radially offset outward relative to the rotation axis. Advantageously, the distance between the rotation axis and the fastening device is the same for all three fastening devices. Furthermore, the angle between any two fastening devices is 120°. Thanks to the arrangement of the fastening devices away from the rotation axis of the wheelchair wheel, the assignment between a wheel body sector arranged on the hub and a fastening device is further facilitated.

[0014] According to an advantageous embodiment, each fastening device has a manually operated handle part with which the fastening device can be transferred from a closed position fixing the wheel body sector to the hub into an open position detachable from the hub. The handle part is arranged on an outer side of the wheelchair wheel in the region of the wheel body sector that is fastened to the hub with the relevant fastening device. To facilitate the assignment between a wheel body sector and the fastening device with which this wheel body sector is fastened to the hub and to ensure that a person sitting in a wheelchair can easily reach the handle part by hand, the handle part is not located directly on the axis of rotation of the wheelchair wheel or adjacent to it, both in the closed position and in the open position, but rather offset radially outwards at a distance from the axis of rotation.

[0015] According to a further advantageous embodiment of the invention, the hub has a circular-cylindrical hollow hub body which is rotationally symmetrical with respect to a rotational axis of the wheelchair wheel and which accommodates a wheel axle of a wheelchair frame.

[0016] According to a further advantageous embodiment of the invention, the hub has a wheel body sector receptacle on its outer side, designed as a circumferential annular groove, in which the wheel sectors are received with a fastening section facing the hub. This wheel body sector receptacle positions the wheel sectors on the hub and aligns them relative to the hub. The wheel body sector receptacle is also capable of absorbing forces acting in the axial direction on the wheelchair wheel and the wheel sectors. It can also be designed to clamp or secure the wheel sectors to the hub using the fastening devices.

[0017] According to a further advantageous embodiment of the invention, the wheel body sector mount is formed by two essentially parallel, radially outwardly projecting, annular hub discs. These two annular hub discs are spaced apart in the axial direction relative to the axis of rotation of the wheelchair wheel by a distance that essentially corresponds to the thickness of the fastening section of the wheel body sectors. The thickness of the fastening section of the wheel body sectors is also determined in the axial direction of the axis of rotation.

[0018] According to a further advantageous embodiment of the invention, each wheel body sector is equipped with a profile, at least in sections, on its two end faces facing the adjacent wheel body sectors. The profiles of adjacent wheel body sectors attached to the hub interlock. Thanks to these interlocking profiles, the wheel body sectors are held in position when axial forces act on the wheelchair wheel and cannot shift relative to each other. Each wheel body sector attached to the hub is thus supported by the wheel body sector mount and by the two adjacent wheel body sectors.

[0019] According to a further advantageous embodiment of the invention, the profile is designed as a groove on one end face of each wheel body sector and as a tongue on the other end face of the wheel body sector. The wheel body sectors attached to the hub form a tongue-and-groove connection with each other.

[0020] According to a further advantageous embodiment of the invention, the tire sections of all wheel body sectors form a continuous tire with a substantially closed circumferential tread. Only the smallest gaps or slits remain between the tire sections of adjacent wheel body sectors.

[0021] According to a further advantageous embodiment of the invention, each wheel body sector is equipped with a hand rim section. The hand rim sections of all wheel body sectors attached to the hub form a circumferential, closed hand rim of the wheelchair wheel. The hand rim is also referred to as a hand rim. It allows a wheelchair user to manually drive or brake the wheelchair wheels. To do so, the wheelchair user grasps the hand rim. The hand rim is typically located on the wheelchair wheel near the rim profile.

[0022] According to a further advantageous embodiment of the invention, the grip ring sections of two adjacent wheel body sectors attached to the hub engage with each other, so that the transition from the grip ring section of one wheel body sector to the grip ring section of the adjacent wheel body sector of the wheelchair wheel is edge-free and injury to the hand of the wheelchair user can be ruled out when the wheelchair user drives or brakes using the grip ring.

[0023] According to a further advantageous embodiment of the invention, the three fastening devices are identical in construction.

[0024] According to a further advantageous embodiment of the invention, the fastening devices are designed as clamping devices which clamp the wheel body sectors to the hub.

[0025] According to a further advantageous embodiment of the invention, the fastening device is equipped with an eccentric clamp.

[0026] According to a further advantageous embodiment of the invention, the eccentric clamp is self-locking. This prevents unwanted loosening of the fastening device due to vibrations. This ensures the secure attachment of the wheel body sectors to the hub.

[0027] According to a further advantageous embodiment of the invention, the eccentric clamp has a clamping lever that can be rotated about a clamping axis that is fixed relative to the hub. The clamping lever is equipped with the handle part of the fastening device and with a clamping part with a clamping curve. The center point of the clamping curve is located off-center relative to the clamping axis of the clamping lever.

[0028] According to a further advantageous embodiment of the invention, the tensioning axis of the fastening devices runs perpendicular to the rotational axis of the wheelchair wheel. The tensioning axis does not intersect the rotational axis of the wheelchair wheel. Strictly speaking, a straight line parallel to the tensioning axis intersects the rotational axis of the wheelchair wheel perpendicularly. The rotational axis of the wheelchair wheel and the tensioning axis of the fastening devices are both straight lines. Preferably, the tensioning axes of the three fastening devices lie in one plane. This plane is perpendicular to the rotational axis of the wheelchair wheel.

[0029] According to a further advantageous embodiment of the invention, in an open position of the fastening device, the clamping part is spaced from a wheel body sector arranged on the hub or rests against it without exerting any force. In a closed position of the fastening device, the clamping part presses against a wheel body sector arranged on the hub with a force predetermined by the clamping curve.

[0030] According to a further advantageous embodiment of the invention, a counterbearing is arranged on the hub, which cooperates with the clamping part in the closed position of the clamping part. A wheel body sector is clamped between the clamping part and the counterbearing in the closed position of the fastening device.

[0031] According to a further advantageous embodiment of the invention, the counterbearing is formed by one of the two annular hub discs of the wheel body sector holder. The clamping part of the eccentric clamp presses a wheel body sector, which is fastened to the hub by the fastening device, against the relevant hub disc. The hub disc thus forms the counterbearing for the eccentric clamp for all three fastening devices. The hub disc remains unchanged when the fastening devices transition from the closed position to the open position and vice versa. It does not influence the transition from the closed position to the open position. Therefore, the fastening devices designed as clamping devices are independent of one another, although they all clamp against the same counterbearing.

[0032] According to a further advantageous embodiment of the invention, each of the wheel body sectors has a recess in which the clamping part rests when the fastening device is in the closed position. This recess increases the force required to move the fastening device from the closed position to the open position. This prevents the fastening device from becoming undesirably loose due to vibration.

[0033] According to a further advantageous embodiment of the invention, the handle is ergonomically shaped. The handle fits comfortably in the hand. It can also be operated by people with limited mobility.

[0034] According to a further advantageous embodiment of the invention, the handle part has at least one grip recess for one or more fingers on a first side. A support surface for the ball of a person's hand is provided on a second side of the handle part, facing away from the first side. In order to move the fastening device from a closed position to an open position, a person places at least one finger in the grip recess and pulls on the handle part. The person can exert pressure on the support surface for the ball of the hand with the ball of the hand and thereby move the fastening device from the open position to the closed position. It is also possible to pull on the handle part when transitioning from the open position to the closed position and to press on the handle part when transitioning from the closed position to the open position.This depends on how the handle is arranged on the attachment device and how the user is positioned relative to the wheelchair wheel and the attachment device in question.

[0035] According to a further advantageous embodiment of the invention, in the closed position of the fastening device, the handle rests against the wheel body sector, which is attached to the hub by this fastening device. The wheel body sector forms a stop for the closed position of the fastening device.

[0036] According to a further advantageous embodiment of the invention, each fastening device has a web arranged on the hub and running parallel to the axis of rotation of the wheelchair wheel. Each wheel body sector has a recess on its fastening section facing the hub, in which recess the web comes to rest when the wheel body sector is fastened to the hub. The web ensures that a wheel body sector arranged on the hub cannot move relative to the hub in the direction of rotation of the wheelchair wheel. Furthermore, the web on the hub and the recess in the wheel body sectors determine the position at which a wheel body sector is arranged on the hub. This is particularly important when all three wheel body sectors have been removed from the hub and are to be reinstalled. The web can be fastened to the two annular hub discs.

[0037] According to a further advantageous embodiment of the invention, the clamping lever of the eccentric clamp is rotatably mounted on the web. The web thus forms part of the eccentric clamp, namely the part of the eccentric clamp that is fixed relative to the hub.

[0038] Further advantages and advantageous embodiments of the invention can be found in the following description, the drawings and the claims. drawing

[0039] The drawing shows an embodiment of a wheelchair wheel according to the invention. It shows: Fig. 1 wheelchair wheel in a side view, Fig. 2 Section through the wheelchair wheel according to Fig. 1 along the line A - A in Fig. 1 marked level, Fig. 3 Wheelchair wheel according to Fig. 1, in which a wheel body sector is removed from the hub, Fig. 4 Section through the wheelchair wheel according to Fig. 3 along the A - A in Fig. 3 marked level, Fig. 5 Wheel body sector of the wheelchair wheel according to Fig. 1 in a supervision, Fig. 6 Wheel body sector according to Fig. 5 in a view from below, Fig. 7 Wheel body sector according to Fig. 5 in side view, Fig. 8 Section through the wheel body sector according to Fig. 5 along the Fig. 5 level marked A - A, Fig. 9 Eccentric clamp of a fastening device of the wheelchair wheel according to Fig. 1 in a side view, Fig. 10 eccentric clamps according to Fig. 9 in another side view, Fig. 11 Eccentric clamp according to Fig. 9 in a view from below. Description of the embodiment

[0040] In the Fig. 1 to 4, a wheelchair wheel 1 is shown, which is rotatable about a rotational axis 2. The rotational axis 2 is a straight line. The wheelchair wheel is a rotationally symmetrical body with respect to the rotational axis 2. The wheelchair wheel 1 has a hub 3 and a wheel body arranged on the hub 3, which wheel body is composed of three identical wheel body sectors 5, 6, 7. Three independent and identical fastening devices 8, 9, 10 are arranged on the hub 3. With each of the three fastening devices 8, 9, 10, exactly one wheel body sector 5, 6, 7 can be fastened to the hub 3. It is irrelevant which of the three wheel body sectors 5, 6, 7 is fastened to the hub 3 with which of the three fastening devices 8, 9, 10. Fig. 5 to 8 show the wheel body sector 5 as an example. In the Fig. 9 to 11 show the fastening device 8 as an example.

[0041] The wheel body has a tire 11 on its circumferential side, which forms a tread 12 of the wheelchair wheel 1 on its outer side. This tread allows the wheelchair wheel to roll on a surface not shown in the drawing. The wheel body also provides the connection between the hub 3 and the tread 12.

[0042] The hub 3 has a first hub disc 13 and a second hub disc 14. These two hub discs 13, 14 are arranged coaxially to the axis of rotation 2 and at a distance from one another. The first hub disc 13 and the second hub disc 14 define an annular groove into which the wheel body sectors 5, 6, 7 are inserted. The annular groove thus forms a wheel body sector receptacle 15 on the hub 3. The wheel body sectors 5, 6, 7 are arranged in the wheel body sector receptacle 15 with a fastening section 16 facing the hub 3. The three fastening devices 8, 9, 10 are arranged on the second hub disc 14, each spaced 120° apart. The hub 3 is also equipped with ball bearings 17 in which a wheel axle 18 is mounted. The wheelchair wheel 1 can be connected to a wheelchair not shown in the drawing via the wheel axle 18.

[0043] Each of the three wheel body sectors 5, 6, 7 extends over an angle of 120° and represents a section of a full circle. The wheel body sectors 5, 6, 7 have a rim profile 19 and a tire section 20 arranged in the rim profile 19. The tire section 20 is made of an elastic material, in particular solid rubber. The tire sections 20 of the three wheel body sectors 5, 6, 7 together form the tire 11, whose tread 12 is a continuous surface except for the transitions between the individual tire sections 20.

[0044] The wheel body sectors 5, 6, and 7 are spokeless. They are equipped with a disc made of carbon fiber reinforced plastic (CFRP). When the three wheel body sectors 5, 6, and 7 are attached to the hub 3, the adjacent wheel body sectors 5, 6, and 7 touch each other at their end faces 21 and 22. On a first end face 21, each wheel body sector 5, 6, and 7 is provided with a groove 23, and on a second end face 22, with a tongue 24 projecting beyond the end face 22. By means of the groove 23 and the tongue 24, the wheel body sectors 5, 6, and 7 arranged on the hub 3 form a tongue-and-groove connection.

[0045] Each of the wheel body sectors 5, 6, 7 is equipped with a hand rim section 25. When the three wheel body sectors 5, 6, 7 are attached to the hub, the hand rim sections 25 of adjacent wheel body sectors 5, 6, 7 touch each other, forming a closed hand rim of the wheelchair wheel 1. The hand rim section 25 is attached to the wheel body sectors 5, 6, 7 via hand rim webs 26.

[0046] In the area of ​​the fastening section 16, the wheel body sectors 5, 6, 7 have a recess 27 for a fastening device 8, 9, 10. The recess 27 extends essentially radially relative to the rotational axis 2 of the wheelchair wheel 1. Each wheel body sector is further provided with a recess 28 designed as a trough for the fastening device.

[0047] The three identical fastening devices 8, 9, 10 are designed as a clamping device with eccentric clamp 29. This is in the Fig. 9, Fig. 10 and Fig. 11. The eccentric clamp 29 has a clamping lever 30 which can be rotated about a clamping axis 31. The clamping axis 31 is a straight line which runs parallel to a straight line intersecting the wheel axis 2 at right angles. The clamping axis 31 is stationary with respect to the hub 3. It does not change its position on the hub 3. The clamping lever 30 is rotatably arranged on a web 32. The web is designed as a bolt and extends essentially parallel to the axis of rotation 2 of the wheelchair wheel 1. The web 32 is fastened at one end to the second hub disc 14. The clamping lever 30 has a handle part 33 and a clamping part 34. The clamping part 34 has a clamping curve as its outer contour, the center point of which lies away from the clamping axis 31. This forms a clamping nose 38. In the section of the clamping nose 38, the clamping part 34 has the greatest extension in the radial direction relative to the clamping axis 31. The handle part 33 is ergonomically shaped.It has two grip recesses 35, 36 on a first side and a support surface 37 for the ball of the hand on a second side facing away from the first side.

[0048] The fastening devices 8, 9, 10 have an open position and a closed position. Fig. 1 and Fig. 2, all three fastening devices 8, 9, 10 are in the closed position. The three wheel body sectors 5, 6, 7 are arranged on the hub 3 and fastened to the hub by means of the fastening devices 8, 9, 10. The wheel body sectors 5, 6, 7 are received with their fastening sections 16 in the wheel body sector receptacle 15, which is designed as an annular groove, on the hub 3 and are held between the first and second hub discs 13, 14. At the end faces of the wheel body sectors 5, 6, 7, the wheel body sectors are held together by a tongue and groove connection. In the closed position, the grip parts 33 of the fastening devices 8, 9, 10 rest against the wheel body sectors 5, 6, 7. The clamping lugs 38 of the eccentric clamps are arranged in the recesses 28 of the wheel body sectors 5, 6, 7 and press the wheel body sectors against the second hub disc 14, so that the second hub disc 14 forms a counter bearing to the eccentric clamp 29.Each wheel body sector 5, 6, 7 is clamped between the second hub disc 14 and the eccentric clamp 29 of a fastening device 8, 9, 10.

[0049] For wheelchair wheel 1 according to Fig. 3 and Fig. 4, the fastening device 8 is in the open position. The wheel body sector 5 is detached from the hub 3 and arranged at a distance from it and from the two other wheel body sectors 6, 7. To transition from the closed position to the open position, the clamping lever 30 of the eccentric clamp is rotated about the clamping axis 31. In doing so, the handle part 33 changes from a position essentially resting against the wheel body sector 5 to a position projecting vertically outwards in the direction of the wheel axis 2. This is particularly well suited in Fig. 4. In order to move the clamping lever 30 from the closed position to the open position by means of the handle part 33, pressure is exerted by hand from above onto the support surface 37. The assignment between the fastening device 8 and the wheel body sector 5 is clearly and unambiguously specified for the user in that the handle part 33 of the fastening device 8 rests against the wheel body sector 5. During the transition from the closed position to the open position, the clamping part 34 is moved relative to the wheel body sector 5 in such a way that the clamping nose 38 no longer presses against the wheel body sector 5. Once this clamping force is removed, the wheel body sector 5 only lies loosely in the wheel body sector receptacle 15 and is only loosely held on the adjacent wheel body sectors 6, 7 via the groove 23 and spring 24. It can now be removed from the hub 3 without great effort.

[0050] In order to subsequently reattach the wheel body sector 5 to the hub 3, the wheel body sector 5 is inserted with its fastening section 16 into the wheel body sector receptacle 15 so that the web 32 of the fastening device 8 comes to rest in the recess 27 of the wheel body sector 5. In this position of the wheel body sector 5, its end faces touch the end faces of the adjacent wheel body sectors 6, 7 and form a tongue and groove connection with them, so that the wheel body sector 5 is now held loosely on the hub 3 again and supported by the two adjacent wheel body sectors 6, 7. The clamping lever 30 of the fastening device 8 is now moved into the closed position by means of the handle part 33.Here, too, the assignment between the handle part 33 of the fastening device 8 and the wheel body sector 5 to be fastened is clear and unambiguous for the user, since the handle part 33 of the fastening device 8 projects outwards from the hub 3, while the handle parts 33 of the two other fastening devices 9, 10 rest on the wheel body sectors 6, 7. This is particularly good in the . Fig. 3 and Fig. 4. During the transition from the open position to the closed position, the clamping part 34 is rotated about the clamping axis 31, so that the clamping lug 38 returns to the recess 28 of the wheel body sector 5. The clamping lug located in the recess cannot detach itself from the recess. The eccentric clamp is self-locking.

[0051] All features of the invention can be essential to the invention either individually or in any combination with one another. Reference numbers 1 wheelchair wheel 2 axis of rotation 3 Hub 4 5 Wheel body sector 6 Wheel body sector 7 Wheel body sector 8 Fastening device 9 Fastening device 10 Fastening device 11 tires 12 Tread 13 first hub disc 14 second hub disc 15 Wheel body sector holder 16 Fastening section 17 ball bearings 18 Wheel axle 19 rim profile 20 tire sections 21 first front side 22 second front side 23 grooves 24 spring 25 Grip ring section 26 Handrim bar 27 Recess 28 Deepening 29 eccentric clamps 30 clamping levers 31 clamping axle 32 bridge 33 Handle part 34 clamping part 35 recessed grip 36 recessed grip 37 support surface 38 Clamping nose

Claims

[1] Wheelchair wheel (1), which is rotatable about an axis of rotation (2), with a hub (3) which can be connected to a wheel axle (18) of a wheelchair frame, with a wheel body arranged on the hub (3), forming a tread (12) of the wheelchair wheel (1) and representing the connection between the tread (12) and the hub (3), which wheel body is composed of three wheel body sectors (5, 6, 7), each wheel body sector (5, 6, 7) being equipped with a rim profile (19) and with a tyre section (20) arranged in the rim profile (19), characterized by , that the wheelchair wheel is equipped with three independent fastening devices (8, 9, 10), each wheel body sector (5, 6, 7) being releasably fastened to the hub (3) by one of the fastening devices (8, 9, 10). [2] Wheelchair wheel according to claim 1, characterized bythat the three fastening devices (8, 9, 10) on the hub (3) are arranged radially outwardly offset with respect to the axis of rotation (2) of the wheelchair wheel (1). [3] Wheelchair wheel according to claim 1 or 2, characterized by that each fastening device (8, 9, 10) has a manually operated handle part (33) with which the fastening device (8, 9, 10) can be transferred from a closed position fixing a wheel body sector (5, 6, 7) to the hub (3) into an open position detachable from the hub (3) and that the handle part (33) is arranged on an outer side of the wheelchair wheel (1) in the region of the wheel body sector (5, 6, 7) which is fastened to the hub (3) by means of this fastening device (8, 9, 10). [4] Wheelchair wheel according to claim 1, 2 or 3, characterized bythat the hub (3) has on its outer side a wheel body sector receptacle (15) designed as a circumferential annular groove, and that the wheel body sectors (5, 6, 7) are received in the wheel body sector receptacle (15) with a fastening section (16) facing the hub (3). [5] Wheelchair wheel according to claim 4, characterized by that the wheel body sector receptacle (15) is formed by two substantially parallel, radially outwardly projecting, annular hub discs (13, 14) which are spaced apart from one another in the axial direction relative to the axis of rotation (2) of the wheelchair wheel (1) by a distance which substantially corresponds to the thickness of the fastening section (16) of the wheel body sectors (5, 6, 7). [6] Wheelchair wheel according to one of the preceding claims, characterized bythat each wheel body sector (5, 6, 7) is provided with a profile at least in sections on its end faces (21, 22) facing the adjacent wheel body sectors (5, 6, 7), and that the profiles of adjacent wheel body sectors (5, 6, 7) fastened to the hub (3) engage with one another. [7] Wheelchair wheel according to claim 6, characterized by that the profile is designed as a groove (23) on one end face (21, 22) of a wheel body sector (5, 6, 7) and as a tongue (24) on the other end face (21, 22) of the wheel body sector (5, 6, 7), and that the wheel body sectors (5, 6, 7) fastened to the hub (3) form a tongue and groove connection with one another. [8] Wheelchair wheel according to one of the preceding claims, characterized by that the tire sections (20) of all wheel body sectors (5, 6, 7) form a continuous tire (11) with a substantially circumferentially closed tread (12). [9] Wheelchair wheel according to one of the preceding claims, characterized by that each wheel body sector (5, 6, 7) is equipped with a grip ring section (25), and that the grip ring sections (25) of all wheel body sectors (5, 6, 7) attached to the hub (3) form a circumferential, closed grip ring of the wheelchair wheel (1). [10] Wheelchair wheel according to claim 9, characterized by that the gripping ring sections (25) of each two wheel body sectors (5, 6, 7) attached adjacent to the hub (3) engage with each other. [11] Wheelchair wheel according to one of the preceding claims, characterized by that the three fastening devices (8, 9, 10) are identical in construction. [12] Wheelchair wheel according to one of the preceding claims, characterized by that the fastening devices (8, 9, 10) are designed as a clamping device which clamps the wheel body sectors (5, 6, 7) to the hub (3). [13] Wheelchair wheel according to claim 12, characterized bythat each fastening device (8, 9, 10) is equipped with an eccentric clamp (29). [14] Wheelchair wheel according to claim 13, characterized by that the eccentric clamp (29) is self-locking. [15] Wheelchair wheel according to claim 3 and according to claim 13 or 14, characterized by that the eccentric clamp (29) has a clamping lever (30) which is rotatable about a clamping axis (31) fixed to the hub (3), and that the clamping lever (30) is equipped with the handle part (33) and with a clamping part (34) having a clamping curve. [16] Wheelchair wheel according to claim 15, characterized by that the clamping axis (31) runs perpendicular to the rotation axis (2) of the wheelchair wheel (1). [17] Wheelchair wheel according to claim 15 or 16, characterized byin that the clamping part (34) in an open position of the fastening device (8, 9, 10) is at a distance from a wheel body sector (5, 6, 7) arranged on the hub (3) or rests against it without force, and in that the clamping part (34) in a closed position of the fastening device (8, 9, 10) presses against a wheel body sector (5, 6, 7) arranged on the hub (3) with a force predetermined by the clamping curve. [18] Wheelchair wheel according to claim 17, characterized by that a counter bearing is arranged on the hub (3), which counter bearing cooperates with the clamping part (34) in the closed position of the fastening device (8, 9, 10), and that a wheel body sector (5, 6, 7) is clamped between the clamping part (34) and the counter bearing in the closed position of the fastening device (8, 9, 10). [19] Wheelchair wheel according to claim 5 and claim 18, characterized by that the counter bearing is formed by one of the two annular hub discs (13, 14). [20] Wheelchair wheel according to one of claims 15 to 19, characterized by that each of the wheel body sectors (5, 6, 7) has a recess (28) in which the clamping part (34) comes to lie in the closed position of the fastening device (8, 9, 10). [21] Wheelchair wheel according to one of claims 3 to 20, characterized by that the grip part (33) has at least one grip recess (36) for one or more fingers on a first side and a support surface for the ball of a person's hand on a second side facing away from the first side. [22] Wheelchair wheel according to one of claims 3 to 21, characterized by that the handle part (33) in the closed position of the fastening device (8, 9, 10) rests on the wheel body sector (5, 6, 7) which is fastened to the hub (3) by means of this fastening device (8, 9, 10), and that the wheel body sector (5, 6, 7) forms a stop for the handle part (33). [23] Wheelchair wheel according to one of the preceding claims, characterized by that each fastening device (8, 9, 10) has a web (32) arranged on the hub (3) and running parallel to the axis of rotation (2) of the wheelchair wheel (1), and that each wheel body sector (5, 6, 7) has a recess (27) on its fastening section (16) facing the hub (3), in which recess the web (32) comes to lie when the wheel body sector (5, 6, 7) is fastened to the hub (3). [24] Wheelchair wheel according to claims 15 and 23, characterized by that the clamping lever (30) of the eccentric clamp (29) is rotatably arranged on the web (32).

Images