Modular tilting assembly and folding wheelchair with it

Abstract

The present disclosure relates to a modular tilting assembly for attachment to the side frames of a wheelchair, in particular a folding wheelchair (1), comprising two groups of modules, one for each side of the wheelchair, each group of modules comprising an outer tilting frame (110) adapted to be attached to the outer side of a wheelchair side frame (10), at least one inner mounting hinge bracket adapted to be attached to the inner side of a wheelchair side frame (10), an actuating element for activating a tilting function, which is attached to the outer tilting frame (110) and the at least one inner mounting hinge bracket, and a guidance and stability bracket (150) adapted to be attached to the wheelchair side frame (10), the actuating element and the outer tilting frame (110).It also relates to a folding wheelchair (1) comprising two side frames (10, 10') connected by a collapsible cross member (18) and having the modular tilting assembly detachably mounted thereon, each side frame (10, 10') being equipped with a group of modules (100) of the modular tilting assembly without engaging the collapsible cross member (18).

Description

[0001] The present disclosure relates to a modular tilt assembly for attachment to the side frame of a wheelchair and a folding wheelchair having a modular tilt assembly attached thereto.

[0002] Folding wheelchairs are widely used because they are easy to transport. For example, US 6,241,275 B1 describes a linkage configuration for a wheelchair with laterally spaced side frames, the linkage configuration comprising a plurality of links extending between the wheelchair side frames, each link having opposite ends, one of the ends of each link being pivotally coupled to one of the side frames and the other end of the link being pivotally coupled to the other side frame, each link having a hinge, the links being foldable relative to each other in non-parallel planes; and an engagement element coupled to one of the hinges and engageable with the other hinge upon deployment of the links to couple the links together.

[0003] There is a need to add additional features to folding wheelchairs without compromising foldability. For example, folding, reclining, and tilting mechanisms for wheelchairs are known; see, for example, US Pat. No. 11,382.810 B2, which teaches a side frame assembly of a personal mobility vehicle comprising: a base frame assembly; a seat frame having a track housing supporting a folding actuation track and a recline adjustment track for relative linear movement and simultaneous linear movement, the folding actuation track configured to be selectively fixed with respect to the track housing between a first base frame assembly position and a second base frame assembly position more compact than the first position; a backrest post pivotally mounted to the seat frame; and a backrest link pivotally mounted to the backrest post and pivotally mounted to the recline adjustment track such that pivotal movement of the backrest post moves the folding actuation track between the first and second positions.

[0004] Accessories for wheelchairs are becoming more important, so too are connection assemblies. A connection assembly for connecting an accessory to a wheelchair is described, for example, in DE 10 2023 107 713. This body connection assembly comprises at least a first body configured to be attached to the accessory; at least one second body configured to be attached to the personal mobility vehicle; and at least one locking assembly configured to lock the connection of the at least one first body and the at least one second body.The at least one locking assembly comprises at least one locking spring coupled to at least one locking element and urging the at least one locking element into a locking position, and at least one return spring coupled to at least one unlocking actuator and urging the at least one unlocking actuator into a locked position, wherein actuation of the at least one unlocking actuator causes the at least one locking assembly to unlock, and the at least one locking element of the at least one locking assembly is allowed to be in a locking position when the unlocking actuator is pressed or moved into the locked position.

[0005] It is the object of the present disclosure to provide a modular tilting assembly for attachment to a folding wheelchair. In particular, the object is to combine the folding and tilting functions of wheelchairs to combine the advantages of a lightweight, easy-to-store folding wheelchair with an external tilting frame to enable end users to extend the use of their folding wheelchair instead of switching to a non-folding tilting wheelchair, this combination being based on a modular solution.

[0006] This object is achieved by a modular tilting assembly for attachment to the side frames of a wheelchair, in particular a folding wheelchair, comprising two groups of modules, one for each side of the wheelchair, each group of modules comprising: • an outer tilting frame designed to be attached to the outer side of a wheelchair side frame, • at least one inner mounting bracket designed to be attached to the inner side of a wheelchair side frame, • an actuator for activating a tilt function, which is attached to the outer tilt frame and the at least one inner mounting joint bracket, and • a guidance and stability bracket designed to be attached to the wheelchair side frame, the actuator and the outer tilt frame.

[0007] The outer tilting frame may be a welded frame. The at least one inner mounting bracket may comprise two mounting brackets that, when mounted on the wheelchair, provide an upper mounting bracket and a lower mounting bracket. The actuating element may comprise spring means, in particular in the form of a gas spring, with a cable pull, preferably in the form of a Bowden cable.

[0008] It is proposed that the outer tilting frame comprises: • a round opening for a swivel attachment to the upper mounting bracket, and / or • an arcuate slot for sliding attachment to the actuator and the lower mounting bracket, and / or • an opening for a, preferably fixed, attachment to the actuating element, and / or • at least one further opening for a, preferably fixed, attachment of the guide and stability bracket, and / or • a plurality of openings for attaching a drive wheel attachment bracket in a selectable position, preferably at a selectable height, when mounted on the wheelchair, and / or • a further plurality of openings for attaching a front castor wheel mounting bracket in a selectable position, preferably at a selectable height, when mounted to the wheelchair.

[0009] The at least one inner mounting bracket can be configured to be mounted to the wheelchair side frame in a form-fitting and / or frictional engagement, preferably at a selectable height, upon installation on the wheelchair. The upper mounting bracket and / or the lower mounting bracket can be configured to be mounted to the wheelchair side frame in a form-fitting and / or frictional engagement, preferably at a selected position, in particular height.

[0010] Furthermore, the at least one inner mounting joint bracket can be provided with at least one extension through which at least one opening for a fastening means extends, and / or the upper mounting joint bracket can be provided with two extensions through which at least one opening for a fastening means extends, and / or the lower mounting joint bracket can be provided with two extensions through which at least one opening for a fastening means extends, and / or the at least one inner mounting joint bracket, the upper mounting joint bracket and / or the lower mounting joint bracket can be provided with a step.

[0011] Embodiments of the present disclosure may be characterized in that each group of modules comprises a drive wheel mounting bracket provided with a plurality of first openings for mounting a drive wheel axle in a selectable position, preferably in a selectable horizontal position, when mounted on the wheelchair, and / or at least one second opening for mounting on one of the side frames or the outer tilting frame.

[0012] The present disclosure also provides a folding wheelchair having two side frames connected by a foldable cross member and having a modular tilt assembly according to the present disclosure detachably mounted thereon, each side frame being equipped with a group of modules of the modular tilt assembly without interfering with the foldable cross member.

[0013] Wheel mounting brackets for removably mounting wheels comprising two drive wheels, two front castors and at least one rear wheel, in particular in the form of an anti-tip wheel, and a removably mountable brake may be provided, wherein the group of modules is adapted to have the wheel mounting brackets and the brake mounted thereon.

[0014] It is proposed that each of the two outer tilt frames is attachable to one of the two side frames on an outer side of the wheelchair, whereas the at least two inner mounting hinge brackets are attachable to the inner side of each side frame, and each of the two guide instability brackets is attachable to an outer tilt frame, an actuator and a side frame.

[0015] It is further proposed that the front caster wheel mounting brackets be removably mounted on either the side frames or the outer tilting frames and / or the drive wheel mounting brackets be removably mounted on either the side frames or the outer tilting frames and / or each rear wheel mounting bracket be removably mounted on either one of the side frames or the outer tilting frames and / or the brakes for the drive wheel be removably mounted on either the side frames or the outer tilting frames.

[0016] Fasteners passing through openings and / or extensions to be accommodated within recesses may be designed for removable attachments under force and / or form fit, and / or shoulders may be provided for alignment.

[0017] Thus, the present disclosure allows retrofitting and thereby improving a folding wheelchair having two side frames connected by a foldable cross member to also become a tilting wheelchair by providing a modular system having outer and inner modules for attachment to the side frames.

[0018] Various aspects of the present disclosure will become apparent to those of ordinary skill in the art from the following detailed description of embodiments with reference to the accompanying schematic drawings. Fig. 1a is a side perspective view of a portion of a folding wheelchair with additional modules of a tilt assembly according to the present disclosure on one side of the wheelchair, from behind and outside the unfolded wheelchair; Fig. 1b is a perspective side view of the Fig. 1a, but with further details on wheel mounting brackets; Fig. 1c is another perspective side view of the Fig. 1a, from behind and inside the unfolded wheelchair; Fig. 1d is another perspective side view of the Fig. 1a from behind and inside the folded wheelchair; Fig. 1e is another perspective side view of the Fig. 1b, from behind and inside the unfolded wheelchair; Fig. 1f is another perspective view of the Fig. 1b, from the front and outside of the unfolded wheelchair; Fig. Figure 2a is a perspective side view of a first module of the Fig. 1a to 1f shown tilting assembly in the form of a welded tilting frame; Fig. Figure 2b is a perspective side view of a second module of the Fig. 1a to 1f shown tilting assembly in the form of an upper mounting joint bracket; Fig. 2c is a perspective side view of a third module of the Fig. 1a to 1f shown tilting assembly in the form of a lower mounting joint bracket; Fig. 2d is a perspective side view of a fourth module of the Fig. 1a to 1f in the form of a front lateral guide and stability bracket; and Fig. 2e is a perspective side view of a fifth module of the Fig. 1a to 1f in the form of a drive wheel mounting bracket.

[0019] The Fig. 1a to 1f show part of a folding wheelchair 1 with two side frames 10, 10'. Only one of the side frames 10 is shown with a front castor 12, a drive wheel 14 and a rear anti-tip wheel 16 attached thereto, the front castor and drive wheel of the other side frame 10' being omitted for clarity. In the present embodiment, there is only one rear anti-tip wheel 16 on one side of the wheelchair 1. Each of the five wheels 12, 14 and 16 is attached via a specific wheel attachment bracket, the respective brackets 13, 15 and 17 being particularly Fig. 1b. The wheel mounting brackets 13, 15, 17 are removable from the side frames 10, 10' and can be mounted at least at different heights, in particular to adapt the specific position to the needs of the user of the wheelchair 1. For this purpose, the side frames 10, 10' and / or the wheel mounting brackets 13, 15, 17 are provided with a plurality of openings for fastening means. Furthermore, a brake 28 is removably mounted on each side to act on the drive wheel 14.

[0020] Both side frames 10, 10' are connected via a collapsible cross member 18 and each comprise a lower tube 20 and an upper tube 22 running parallel to the lower tube 20, wherein, when viewed in the forward direction of travel of the wheelchair 1, two parallel rods 24, 26 connect the tubes 20, 22 at a rear end of the side frame 10. The cross member 18 connects the lower tubes 20 of the side frames 10, 10' to each other, while the upper ends of the cross member 18 are connected to both the upper tubes 22 and a seat or seat frame (not shown). The two rods 24, 26 are provided with a plurality of openings for attaching fastening means. The openings are arranged in recesses to accommodate rail-like projections.

[0021] When a conventional folding wheelchair is to be used with an attachment according to the present invention to provide a tilting function, the mounting bracket 15 of the drive wheel 14 can be detached by loosening fasteners passing through respective openings 24a, 26a of the two rods 24, 26 on each side of the wheelchair. Furthermore, the mounting bracket 13 of the front caster 12 can be detached from the lower tube 20 of each side frame 10, 10', whereas the single anti-tip wheel 16 can be detached via the mounting bracket 17 from only one of the respective lower tubes 20. Furthermore, the brake 28 must be released.

[0022] The tilting function is realized via two groups of modules 100 mounted on the wheelchair side frames 10, 10', leaving the folding cross member 18 intact and collapsible. Each group is attached to a side frame 10, 10' after the wheels 12, 14, and 16 have been removed by releasing the mounting brackets 13, 15, and 17, respectively, and the brake 28 has been disconnected.

[0023] The pivoting can be actuated or restricted by a gas spring 140 of each group of modules 100. The gas spring 140 can be actuated by means of a Bowden cable 141 connected to a handle mounted either on a backrest (not shown) or on an armrest 30 of the wheelchair 1.

[0024] The folding wheelchair 1 from the Fig. 1a to 1f is improved by mounting a group of modules 100 on a side frame 10. The group of modules 100 comprises, in addition to the gas spring 140 with Bowden cable 141, further modules, namely: • a welded tipping frame 110, see also Fig. 2a, • an upper mounting bracket 120, see also Fig. 2b, • a lower mounting bracket 130, see also Fig. 2c, and • a front lateral guidance and stability bracket 150, see also Fig. 2d, which can be attached to each other and to the side frame 10 via a plurality of fastening means. As an additional module of the group of modules 100, the wheel mounting bracket 15 of the drive wheel 14 can be designed for the tilting function in order to compensate for a change in the center of gravity due to tilting. The second group of modules 100, which are shown in the Fig. 1a to 1f is not shown and is to be attached to the other side frame 10', comprises analogous modules to the first group of modules 100. This arrangement of the two groups of modules 100 makes it possible to add the tilting function to the folding wheelchair 1 even on the aftermarket.

[0025] While the welded tilting frame 110 and the wheel attachment bracket 15 are arranged on the outer side of the wheelchair side frame 10, the other modules of the group of modules 100 are arranged on the inner side of the wheelchair side frame 10, so that the wheelchair side frame 10 of the conventional folding wheelchair 1 is sandwiched between the welded tilting frame 110 and the wheel attachment bracket 15 on one side and the upper mounting joint bracket 120 and lower mounting joint bracket 130 at a rear end on the other side and the front lateral guidance and stability bracket 150 at a front end on the other side.The gas spring 140 extends from the lower mounting hinge bracket 130 to the upper end of the welded tipping frame 110, with the lower end of the front lateral guidance and stability bracket 150 being mounted to the lower tube 20 of the wheelchair side frame 10 and the upper end thereof being attached to the welded tipping frame 110.

[0026] The two groups of modules 100 provide a modular tilting assembly and further details of the modules are described below: The Fig. The welded tilting frame 110 shown in Figure 2a comprises two rod-shaped attachment means 111, 112 which, when mounted on the wheelchair 1, run substantially parallel to each other, i.e., substantially vertically, and are each provided with a plurality of openings 111a, 112a. The two rod-shaped attachment means 111, 112 are connected to each other via two connecting pieces 111b, 112b which run substantially perpendicular to the two rod-shaped attachment means 111, 112. An extension 116 is connected to the lower attachment means 112, and a further extension 112c is provided by the upper connecting piece 112b. Two tubes 113, 114 extend from the two connecting pieces 111b, 112b to a U-shaped attachment means 117 which is provided with a further extension 118.Each extension 112c, 116, 118 is provided with a through hole for connecting the upper mounting joint bracket 120, the lower mounting joint bracket 130 and the gas spring 140.For this purpose, the lower rear through-hole is in the form of an arcuate slot 116 to allow a sliding connection between the welded tilting frame 110 and the rear end of the gas spring 140, which is also attached to the lower mounting hinge bracket 130 via a first fastening means 160; the upper rear through-hole is in the form of a round opening 115 in the connecting piece extensions 112c to allow a pivotal connection of the welded tilting frame 110 with respect to the upper mounting hinge bracket 120 via a second fastening means 161; and the upper front through-hole is in the form of a round opening 118a in the extension 118 to allow a pivotal connection of the welded tilting frame 110 with respect to the upper end of the gas spring 140 via a third fastening means 171.Furthermore, the U-shaped mounting means 117 is provided with upper and lower openings 119a, 119b for attaching the front lateral guidance and stability bracket 150 via extensions 154a, 154b thereof. The U-shaped mounting means 117 is also provided with a plurality of openings 119c that allow the wheel mounting bracket 17 of the front caster 16 to be attached at a different height via additional fastening means 169a, 169b.

[0027] The upper mounting bracket 120, shown in Fig. 2b, comprises two attachment sections 121, 122, with a step 124 formed therebetween. The front attachment section 121 is provided with an opening 123 for the second fastening means 161, which passes through the round opening 115 of the welded tilting frame 110 and an opening in the housing of the gas spring 140. The rear attachment section 122 has openings 125a, 125b, 126a, 126b for fastening means 164a, 164b, 165a, 165b, allowing attachment to the side frame bars 24, 25. First openings 125a, 125b extend through a first rail-like projection 125 and second openings 126a, 126b extend through a second rail-like projection 126, wherein the projections 125, 126 are adapted to be accommodated in complementary recesses of the side frame bars 24, 25 for a positive and frictional fit.The step 124 of the upper mounting hinge bracket 120 allows the side frame bar 24 to be partially enclosed to reinforce the attachment.

[0028] The lower mounting bracket 130, shown in Fig. 2c, also includes two attachment sections 131, 132, with a step 134 formed therebetween. The step 134 again partially encloses the side frame bar 24 for further attachment. The front attachment section 131 is provided with an opening 133 for the first fastener 160, which passes through the arcuate slot 116 of the welded tilt frame 110 and an opening at the rear end of the gas spring housing 140. The rear attachment section 132 has openings 135a, 136a for further fasteners 162, 163, allowing attachment to the side frame bars 24, 25. Each opening 135a, 136a extends through a rail-like projection 135, 136 which is adapted to be accommodated in complementary recesses of the side frame bars 24, 25 for a positive and frictional engagement.

[0029] The front lateral guidance and stability bracket 150, shown in Fig. 2d, comprises a split tube 151 for at least partially surrounding the lower tube 20 of the wheelchair side frame 10, wherein the split tube 151 is attached to two support arms 152, 153, which are connected to each other via connecting means 155 and to the welded tilting frame 110 via two extensions 154a, 154b, wherein the extensions 154a, 154b pass through the openings 119a, 119b of the front attachment means 117. Furthermore, an opening 156 is provided through the front lateral guidance and stability bracket 150 for further attachment.

[0030] The wheel mounting bracket 15 for the drive wheel 14, shown in Fig.2e, comprises three openings 15a, 15b, 15c for attaching the drive wheel axle, allowing adjustment of the drive wheel location to the center of gravity in three different positions along a substantially horizontal line. Furthermore, there are two openings 15d, 15e for attaching the mounting bracket 15 to the attachment means 111, 112 of the welded tilting frame 110, which are provided with the plurality of openings 111a, 112a for this purpose.

[0031] The number and shape of the openings, as well as the number and type of fasteners, can vary. The exact location of the openings can also vary. What matters is which modules are connected to each other and how the modules are connected to the wheelchair side frames.

[0032] To upgrade a conventional folding wheelchair 1 to include a tipping function, the wheel mounting brackets 13, 15, and 17, along with the respective wheels 12, 14, and 16, and the brake 28 must first be removed. In a next step, a group of modules 100 is attached to each side of the wheelchair 1 using fasteners 160 to 171. In a final step, the wheels 12, 14, and 16 are attached using the respective wheel mounting brackets 13, 15, and 17. Furthermore, the bracket 28 is attached. This improvement to the wheelchair is easy to implement. However, it is recommended that these improvements be carried out by a technician, since the positions of the wheels 12, 14, and 16 must be adjusted to the change in gravity when allowing tipping.

[0033] Furthermore, the group of modules 100 according to the present disclosure can be used with different folding wheelchairs because the plurality of openings of the different modules allows adaptation to the different wheelchairs, in addition to allowing individual adaptation of each wheelchair to its user.

[0034] The principle and operation of this invention have been explained and illustrated in its preferred embodiment. However, it should be understood that this invention may be practiced otherwise than as specifically explained and illustrated without departing from its spirit or scope. Reference symbol 1 folding wheelchair 10, 10' side frame 12 front roller 13 Wheel mounting bracket 14 Drive wheel 15 Wheel mounting bracket 15a-c Wheel mounting opening 15d, e frame mounting opening 16 anti-tip wheel 17 Wheel mounting bracket 18 foldable cross brace 20 lower tube 22 upper tube 24 front bar 24a Opening 26 rear rod 26a Opening 28 Brake 30 armrest 100 group of modules 110 welded tipping frame 111 attachment devices 111a Opening 111b connecting piece 112 attachment devices 112a Opening 112b connecting piece 112c Extension 113 pipe 114 pipe 115 round opening 116 arched slot 117 attachment devices 118 Mounting extension 118a Opening 119a, b opening 119c Opening 120 upper mounting bracket 121 Attachment section 122 Attachment section 123 Opening 124 level 125 rail-like projection 125a, b opening 126 rail-like projection 126a, b opening 130 lower mounting bracket 131 Attachment section 132 Attachment section 133 Opening 134 level 135 rail-like projection 135a Opening 136 rail-like projection 136a Opening 140 gas spring 141 Operating cable (Bowden cable) 150 front side guide and stability bracket 151 split pipe 152 Mounting arm 153 Mounting arm 154a, b Extension 155 lanyards 156 Opening 160 fasteners 161 fasteners 162 fasteners 163 fasteners 164a, b Fasteners 165a, b Fasteners 166a, b Fasteners 168 fasteners 169a, b Fasteners 171 fasteners QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] US 6,241,275 B1

[0002] US 11,382,810 B2

[0003] DE 10 2023 107 713

[0004]

Claims

[1] Modular tilting assembly for attachment to the side frames (10, 10') of a wheelchair (1), in particular a folding wheelchair, comprising two groups of modules (100), one for each side of the wheelchair, each group of modules (100) comprising: • an outer tilting frame (110) adapted to be attached to the outer side of a wheelchair side frame (10), • at least one inner mounting bracket adapted to be attached to the inside of a wheelchair side frame (10), • an actuating element for activating a tilting function, which is attached to the outer tilting frame (110) and the at least one inner mounting joint bracket, and • a guidance and stability bracket (150) adapted to be attached to the wheelchair side frame (10), the actuator and the outer tilt frame (110). [2] Modular tilt assembly according to claim 1, wherein • the outer tilting frame (110) is a welded frame, and / or • the at least one inner mounting joint bracket comprises two mounting joint brackets which, when mounted on the wheelchair (1), provide an upper mounting joint bracket (120) and a lower mounting joint bracket (130), and / or • the actuating element comprises spring means (140), in particular in the form of a gas spring, with a cable pull, preferably in the form of a Bowden cable (141). [3] Modular tilting assembly according to claim 1 or 2, wherein • the outer tilting frame (110) comprises a round opening (115) for pivotal attachment to the upper mounting bracket (120), and / or • the outer tilt frame (110) includes an arcuate slot (116) for sliding attachment to the actuator and the lower mounting bracket (130), and / or • the outer tilting frame (110) comprises an opening (118a) for a preferably fixed attachment to the actuating element, and / or • the outer tilting frame (110) comprises at least one further opening (119a, 119b) for a preferably fixed attachment of the guide and stability holder (150), and / or • the outer tilting frame (110) comprises a plurality of openings (111a, 112a) for attaching a drive wheel attachment bracket (15) in a selectable position, preferably at a selectable height, when mounted on the wheelchair (1), and / or • the outer tilting frame (110) comprises a further plurality of openings (119c) for attaching a front castor wheel attachment bracket (17) in a selectable position, preferably at a selectable height, when mounted on the wheelchair (1). [4] Modular tilting assembly according to one of the preceding claims, wherein • the at least one inner mounting joint bracket is designed to be mounted in a form-fitting and / or force-fitting manner on the wheelchair side frame (10), preferably at a selectable height, when mounted on the wheelchair (1), and / or • the upper mounting joint bracket (120) and / or the lower mounting joint bracket (130) is designed to be mounted in a form-fitting and / or force-fitting manner on the wheelchair side frame (10), preferably in a selected position, in particular height. [5] Modular tilting assembly according to one of the preceding claims, wherein • the at least one inner mounting joint bracket is provided with at least one extension (125, 126, 135, 136) through which at least one opening (125a, 126a, 135a, 136a) for a fastening means extends, and / or • the upper mounting joint bracket (120) is provided with two extensions (125, 126), through each of which at least one opening (125a, 126a) for a fastening means extends, and / or the lower mounting joint bracket (130) is provided with two extensions (135, 136), through each of which at least one opening (135a, 136a) for a fastening means extends, and / or • the at least one inner mounting joint bracket, the upper mounting joint bracket (120) and / or the lower mounting joint bracket (130) is provided with a step (124, 134). [6] Modular tilting assembly according to one of the preceding claims, wherein each group of modules (100) comprises a drive wheel mounting bracket (15) provided with: a plurality of first openings (15a, 15b, 15c) for attaching a drive wheel axle in a selectable position, preferably in a selectable horizontal position, when mounted on the wheelchair (1) and / or at least one second opening (15d, 15e) for attachment to one of the side frames (10, 10') or the outer tilting frame (110). [7] A folding wheelchair (1) comprising two side frames (10, 10') connected by a collapsible cross member (18) and to which the modular tilting assembly according to any one of the preceding claims is detachably mounted, each side frame (10, 10') being equipped with a group of modules (100) of the modular tilting assembly without engaging the collapsible cross member (18). [8] Folding wheelchair (1) according to claim 6, further comprising Wheel mounting brackets (13, 14, 15) for the removable mounting of wheels comprising two drive wheels (14), two front rollers (12) and at least one rear wheel, in particular in the form of an anti-tip wheel (16), and a removable mountable brake (28), wherein the group of modules (100) is designed to have the wheel mounting brackets (13, 15, 17) and the brake (28) attached thereto. [9] Folding wheelchair (1) according to claim 7 or 8, wherein each of the two outer tilting frames (110) is attachable to one of the two side frames (10) on an outer side of the wheelchair (1), whereas the at least two inner mounting hinge brackets are attachable to the inner side of each side frame (10, 10'), and each of the two guide instability brackets (150) is attachable to an outer tilting frame (110), an actuating element and a side frame (10, 10'). [10] A folding wheelchair (1) according to any one of claims 7 to 9, wherein the front castor wheel mounting brackets (17) are removably mounted on either the side frames (10, 10') or the outer tilting frame (110), and / or the drive wheel mounting brackets (15) are removably mounted on either the side frames (10, 10') or the outer tilting frame (110), and / or each rear wheel mounting bracket (13) is removably mounted on either one of the side frames (10, 10') or the outer tilting frame (110), and / or the brakes (28) for the drive wheel (14) are removably mounted on either the side frames (10, 10') or the outer tilting frame (110). [11] Folding wheelchair (1) according to one of claims 7 to 10, wherein fastening means (160 - 171) passing through openings (15d, 15c, 24a, 25a, 111a, 111b, 119c, 125a, 125b, 126a, 126b, 135a, 136a) and / or extensions (125, 126, 135, 136) to be accommodated within recesses are designed for the removable attachments under force and / or form locking, and / or shoulders (124, 134) are provided for alignment.

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