DE4325092A1 - Traction vehicle that can be coupled to a wheel-chair - Google Patents

Abstract

The invention relates to a traction vehicle 18 which can be coupled to a wheel-chair 19 and is equipped with a coupling device 115 which is provided between the wheel-chair 19 and the traction vehicle 18 and is releasably connected at least to the wheel-chair 19 and/or the traction vehicle 18 and permits adjustment of the traction vehicle about at least two intersecting axes. The coupling device 115 has a coupling member which is designed as a three-point coupling 118 and has at least one coupling socket 119 serving to receive a coupling element or coupling mandrel 87. <IMAGE>

Description

The invention relates to a wheelchair connectable towing vehicle with a roll between Chair and towing vehicle provided coupling device is equipped, at least to the wheelchair and / or is detachably connected to the towing vehicle and an adjustment of the towing vehicle by at least allows two intersecting axes.

It is already well known to use a wheelchair a coupling device with a motor-driven Towing vehicle to connect which is a movement of the train vehicle compared to the wheelchair in horizontal as well in the vertical direction, so that the steering process in any direction and especially on un level terrain is possible. The coupling device is designed so that the uncoupling of the Towing vehicle from a wheelchair is possible. The uncoupling and especially the coupling process is very complex and time-consuming and especially for the disabled People cannot be carried out without help.

In contrast, the invention is based on the object the towing vehicle of the type mentioned above train and arrange the coupling device so that coupling and uncoupling also for disabled people is easily possible.

The task is solved in that a clutch direction has a coupling part, which as a three-point  clutch is formed and at least one clutch bag that holds a clutch elements or coupling mandrel. By the advantage stick training and attaching a clutch pocket three-point coupling between train The coupling and uncoupling process becomes a tool and wheelchair much easier. The coupling process will also advantageously supported by the clutch pocket, since the towing vehicle only has to be pushed back, until the corresponding coupling element of the towing vehicle is connected to the coupling element of the wheelchair. The clutch pocket supports the positive guidance when Inserting one coupling element into the other Coupling element. This allows for the first time for disabled people pulling a tractor to a wheelchair couple without the operator of the wheelchair must leave or the Hal taken in the wheelchair need to change because the towing vehicle or the Wheelchair visibility in the area of the coupling elements releases.

It is advantageous for this that the coupling device at least one on the towing vehicle and / or on the wheelchair provided coupling part with a clutch before has a facilitating guide part. Through the Use of the guide part in the area of the dome lungs device is provided when coupling the coupling of the towing vehicle to the wheelchair much easier.

An additional option is according to a continuation extension of the device according to the invention that the three point coupling three receiving parts or coupling pockets has as an independent hitch  on the one hand to the wheelchair and on the other hand to the Towing vehicle is releasably connectable. Such Coupling device can be easily at Existing wheelchairs between a train ride Integrate and attach the tool and the wheelchair. This three-point coupling device is then used for Ver binding the towing vehicle with the wheelchair.

In a further embodiment of the invention, it is advantageous liable that a clutch pocket with respect to the longitudinal center axis of the towing vehicle is arranged centrally. By using only one clutch bag to loosen clear connection between the towing vehicle and the three point device coupling or the wheelchair becomes the coupling development process is significantly simplified.

According to a preferred embodiment of the Invention appropriate solution is finally provided that two Coupling pockets with reference to the longitudinal central axis of the Traction vehicle arranged at a distance from the longitudinal central axis are net and that the two clutch pockets are the same Chen distance to the longitudinal center axis of the towing vehicle point.

In connection with the training according to the invention and arrangement it is advantageous that two clutches pockets to hold coupling elements on the roll chair or on the three-point coupling are provided and the other clutch pocket also at the three point coupling or on the towing vehicle directly or indirectly connected. Since the three-point clutch with three Clutch pockets is equipped and at least two Clutch pockets a variable distance apart which have manufacturing tolerances without  compensate further and further this clutch device without any problems on any wheelchairs if the two coupling pockets open the corresponding gauge of the wheelchair to be pulled are set.

It is also advantageous that the clutch pockets are tubular. Such clutch pockets are inexpensive and relatively easy to manufacture len and also allow an adjustment of the in the Coupling pocket received coupling element around the Longitudinal central axis of the clutch pocket.

It is also advantageous that the clutch pockets Have locking elements over which the clutch elements can be fixed optionally. By means of the arr tation elements can easily the hitch locking elements locked in any desired position become.

For this purpose, it is also advantageous that at least one Guide part in the area of the lateral limitation of the Clutch pockets are provided. This will make one Licher offset of a coupling element compared balanced the other coupling element.

It is also advantageous that the guide part from at least two diverging sliding elements ten or guide surfaces.

In a further embodiment of the invention, it is advantageous liable that a second coupling device a gimbal has an articulated connection which consists of a train vehicle provided vertical axis with a hori  zontal, rotatable socket, on which an eyelet for Inclusion of a horizontal hinge pin is connected to the connection of the drawbar serves, which is telescopic and about a Snap lock connection on the first coupling device tion can be secured, and that the locking connection or snap lock connection from an opening or hole having tab, which is parallel to a coupling element having a guide surface ment or Dorn runs, both in a Ausspa tion of the coupling belonging to the locking connection tion element can be introduced, via which the towing vehicle is connectable to the wheelchair. Through the gimbal articulated connection between towing vehicle and roll chair is an all-round movement of the towing vehicle compared to the wheelchair possible, so that steering in any direction as well as journeys on uneven terrain without more are possible.

As previously described, the training ensures that the locking connection with the wheelchair or the Three-point clutch is connected. Through the lock connection you get a flawless fuse of the clutch accommodated in the clutch pocket elements and also the possibility of this at any time to unlock again with little effort, if this is desired. For this purpose, it is advantageous that the Locking connection with a cross member of the three point coupling is connected.

An additional option according to further training the device according to the invention is that a cross member of the three-point hitch is variable in length is formed and a coupling pocket at each end  with one latch and one with a lever has arm-operated clamping eyelet. This allows the Three-point coupling on any wheelchair without more can be connected.

According to a further embodiment of the invention it is advantageous that the coupling element or Coupling mandrel is connected to the drawbar that is connected to the towing vehicle, the Zugge rods in coupled condition opposite the three point coupling around an approximately horizontal one Axis is rotatable, and that the pull rod in Ankup peltem condition compared to the three-point clutch by approximately horizontal axis at an angle range between 1 ° and 360 ° or at an angle range between 5 ° and 30 ° is rotatable.

An essential advantageous embodiment is achieved one in that the pull rod or the handlebars Steering of the towing vehicle is designed to be buckled and the adjustable parts in the unfolded position development of the linkage or the handlebar via the instep lock connection are lockable.

It is also advantageous that the foldable parts the linkage or the handlebar in the area of the hitch lungshakens or the kink opposite Füh tion elements and that the latch on Wheelchair can be attached in different positions.

It is also advantageous that the clutch pockets to create a coupling element to be coupled un guide surfaces enclosing an angle one behind the other have the direction of the hitch to be coupled  lungselement are arranged diverging, and that the clutch having guide surfaces element of the handlebar has a centering element.

In a further embodiment of the invention, it is advantageous adheres that the sliding elements coupling element one with reference to the drawbar or the Strut has a centering element arranged in that a counterpart is insertable.

Further advantages and details of the invention are in the claims and explained in the description and shown in the figures, it being noted that all individual features and all combinations of individual features are essential to the invention. It shows

Fig. 1 is a perspective view of a connected to the wheelchair Zuggeräts,

Fig. 2, the two parts of an articulatable support a steering device with a stand device for securing the Trä gers in an upright position,

Figure 3 is a front view of the bent Trä gers direction. With a centering element and a hook-shaped Arretierungsvor,

Fig. 4 is a partial view of the coupling member for the linkage for connection to the wheelchair,

Fig. 5 designed as a turnbuckle for connecting Arre tierungsvorrichtung of the towing vehicle with the wheelchair,

Fig. 6 shows the three-point coupling between Zugfahr tool and wheelchair and the associated clutch pockets for connecting the individual coupling elements in Explo sionsdarstellung.

In the drawing, 19 denotes a wheelchair, which can be designed as a collapsible or not collapsible wheelchair.

As is apparent from Fig. 1 in particular, is at the front of the wheelchair 19 is a uniaxial Zugfahr generating 18 is connected to a drive device which Darge presented electric motor 1 can be driven is only schematically a in the drawing, but by one or two batteries 47 with electricity is supplied.

The wheelchair has two front controllable wheels 5 and 6 and two rear wheels not shown in the drawing, which are equipped on the outside with a hand ring for manual drive of the rear wheels, which can be used when the towing vehicle is not Available. The towing vehicle 18 consists of a housing 7 with an axis 25 'for receiving the main drive wheels 14 and 15 and a front axle not shown in the drawing for receiving two front wheels or a support wheel 22nd The two axes 25 'are rigid, ie not steerable, mounted in the housing 7 . Steering of the towing vehicle can take place, for example, by swiveling the towing device about its rear, horizontally running axis 25 'and simply swiveling or rotating the towing device about a vertically running axis. For this purpose, a handlebar 11 is pressed down so that the towing vehicle pivots about the axis 25 ', the support wheel 22 is lifted off the ground and the towing vehicle can now be turned to the right or left with respect to the towing vehicle. Furthermore, it is possible to drive the rear wheels at different speeds via the electric motor, in order to guide the towing vehicle in a different direction. In addition, it is possible to form the front wheels not shown in the drawing in a steerable manner.

The driving device is shown in FIG. 1 is covered by a removable cover 9 whose top as Ab footprint for a container or a basket is out can be.

The towing vehicle 18 is connected via a pull rod 10 and / or via a pull line between 10 and wheelchair 19 before viewed three-point hitch 118 with the wheelchair 19 detachably. On the upper part of the handlebar 11 are not shown in the drawing elec trical control devices through which the electric motor 1 , electrical control and regulating elements, the brake sen and a gear 16 and the clutch, not shown in the drawing, can be actuated when the wheels 14 and 15 are to be driven either together or separately.

In Fig. 2, the handlebar 11 is partially shown, which consists of a lower non-hinged strut 77 and an upper hinged strut 78 , which is vertically pivoted ver about a vertically extending bolt 85 so that the upper strut 78 from the in Fig. 2 position shown in the folded position in Fig. 3 can be pivoted when z. B. the towing vehicle 18 is loaded into a vehicle. In the position shown in Fig. 2, the upper part of the strut 78 is secured by means of a clamping closure 70th The clamp closure 70 is similar to the remaining clamps 116 of FIG. 6 made of an upper lever 71 which is pivotable about a horizontally extending pivot pin 72 from the position shown in FIG. 2 in a lower position and in this way the loop 73 from the Hook 74 moved out, which is attached to the lower part of the strut 77 . The eyelet 73 he extends through a bore in a bolt 86 and has at the upper end a threaded part 75 on which a nut 76 can be screwed so that the eyelet 73 is adjusted up or down and then via a second nut 76th 'Can be secured to ensure in the end position of the lever 71 shown in FIG. 2 that the eyelet 73 can not slide out of the hook 74 and also a rattle-free position of the upper part of the strut 78 on the lower part of the strut 77 is ensured.

As can be seen from Fig. 2, the hook 74 is attached to a plate 127 ( Fig. 3) which is equipped with two diverging-running guide surfaces or sliding elements 126 , so that during a pivoting process of the upper part 78 to the lower part 77 the side parts of the tubular upper part come into contact with the sliding surfaces and thereby ensure a precise, chatter-free centering of the foldable upper part 78 on the lower fixed part 77 .

Furthermore, the plate 127 or the sliding elements 126 having plate 127 a with respect to the tie rod 10 or the struts 77 and 78 centrally arranged centering element 129 , the counterpart in the U-shaped Ge of the upper strut 78 fits exactly is so that in the position shown in FIG. 2 via the centering element 129 a rattle-free connection between the two struts 77 and 78 is ensured. The Zen trier element 129 can be formed as a U-shaped recess into which a corresponding bolt or an elongated part is inserted during the pivoting-in process of the strut 78 into the position according to FIG. 2. The provided on the outer part of the centering element 129 sliding elements 126 support the Einschwenkvor gear of the strut 78 when this is not exactly around the Bol zen 85 .

The clutch device shown in FIG. 5 is part of the three-point clutch 118 , which is shown in FIG. 6 before the clutch phase in an exploded view. The designed as a three-point clutch coupling device 118 consists of a tubular cross member 121 , in the end tubular cross member 123 are slidably received, which can be secured by means of a locking element or a Bolt bolt 128 or via a clamp connection such that they can be fixed in different positions are to adapt the two coupling points to corresponding coupling points in this way, which can be seen on the wheelchair to be pulled, so that in this way the coupling device 118 can be adapted to any wheelchair without modification. A mounting plate 131 ( FIG. 6) is located on the cross members 123 and can be part of the tension lock 116 . The mounting plate 131 has numerous openings or Bohrun gene 132 , so that the mounting plate 131 by means of bolts not shown in the drawing to also not shown in the drawing threaded holes that may be provided in the wheelchair can be closed. The two with a distance to each other arranged latches 116 correspond to the Spannver circuit 70 already described in detail in FIG. 2, so that the parts of the two latches shown in FIG. 6 are given the same reference numbers.

On the inside of the mounting plate 131 there is the turnbuckle 116 with the eyelet 73 which engages over a hook 74 which is fastened to a coupling element or coupling mandrel 87 . The coupling mandrel 87 is fixedly connected to the cross member 123 and extends at right angles with respect to the cross member 123 . The distance between the two coupling elements 87 , which are each arranged at the ends of the two cross members 123 , can, as already mentioned, who changed the. For this purpose, only the bolt 128 and a clamp connection 130 need to be loosened. The screw bolt 128 is guided by the cross member 121 and the tubular cross member 123 to ensure that the cross member 123 is properly secured. However, it is also possible to dispense with the screw bolt 128 and only to clamp the cross member 123 in the tubular cross member 121 by using the clamp connection 130 for this purpose.

The illustrated in Fig. 6, formed as a coupling device three-point hitch 118 can be at least two, but three clutch bags in the exemplary embodiment have 119, two bags clutch disk 119 with the clamping closure 116 and with the assembly are connected to the 131st The clutch pocket 119 serves to receive the clutch mandrel 87 . If the coupling mandrel 87 results in the clutch case 119 is, so the loop can lay around the coupling hooks 74 73 so that pulling by pivoting the lever 71 in the direction of the wheelchair 19, the eyelet 73 hook the clutch 74 to the rear until the lever 71 according to Fig. 6 on the stationary part of the processing Kupplungsvorrich 118 is folded up on the wheelchair 19th A firm connection between the two coupling mandrels 87 and the coupling pockets 119 is thereby achieved.

So that the coupling process of the two outer coupling mandrels 87 'in the spaced apart angeord Neten coupling pockets 119 is facilitated, these can be equipped with sliding elements or guide members 117 , which expand the coupling pockets in the front Be funnel-shaped and thus a centering tion of the coupling mandrels 87th make sure during the coupling process.

In the embodiment of Fig. 6 with respect to the supporting surface of the towing vehicle 18 or the roller chair 117 provided in each case 19 a vertically extending guide surface or a guide member on the outer side of the pockets in the coupling 119th It is also possible to arrange two diverging guide parts 117 on each coupling pocket 119 , which extend divergingly to the rear. It is also possible to see the coupling pocket 119 at the end with funnel and / or cylindrical guide parts or straight guide surfaces.

In the exemplary embodiment according to FIG. 6, the two guide parts 117 of the two spaced-apart coupling pockets 119 also form a divergent part for the two spaced-apart coupling pins 87 . This allows a lateral offset of the three-point coupling to be compensated for. If a height displacement of the coupling pins 87 are balanced, so that corresponding coupling pocket as already he imagines, 119 formed funnel-shaped.

Besides the already mentioned clutch outer bags 119 is a third clutch pocket 119 disposed on the upper side of the cross member 121 extending coaxially to the center line of the wheelchair 19th This clutch pocket 119 can, like the other two clutch pockets 119, consist of a tubular part.

The coupling pocket 119 with an associated locking or locking connection or snap lock connection 58 is illustrated in FIG. 5 and in FIG. 6.

In Figs. 4 and 5, the pull line 10 Darge sets, which can be formed invariable in length and is at one end connected vertically pivotable about a hinge pin 68 to a lug 57 which is supported horizontally pivotable by means of a bushing 56 on a vertical axis 55, so that the wheelchair 19 can be towed well over the towing vehicle 18 . This articulation thus forms a kar hinged joint connection 54 , which allows all-round movement of the towing vehicle 18 relative to the wheelchair 19 . There is also the option of designing the boom as a telescopic boom. The telescopic linkage consists of a linkage part 134 , which is rotatable in a tubular linkage part 135 by 360 °, preferably rotatable between an angle of 3 ° and 30 °. For this purpose, the Ge rod part 135 can be equipped with a rotation lock, which is received in an inner groove, not shown in the drawing, of the rod part 135 . In the exemplary embodiment according to FIG. 4, however, the rod part 134 is secured by a screw bolt 136 .

On the axis 55 is the in Fig. 4 Darge presented carrier or handlebar 11 , which can be equipped with corresponding control devices on its upper schematically arranged panels 12 ( Fig. 1). As already explained, the carrier or handlebar 11 can consist of the struts 77 and 78 according to FIGS. 1 and 4 and can thus be folded down. Furthermore, it is also possible to form the carrier 11 as a rigid linkage via which the towing vehicle 18 can be controlled or tilted about the wheel axis 25 '.

As 5 further apparent from Fig., There is the on-circuit element of the linkage 10 from the front Kupp development element or mandrel 87 having a bore 88 tab 89, the saving in a respective one of 90 of the latch connection or the Arre tierungsverbindung 58 insertable and can be locked there by means of a coupling bolt 91 . For this purpose, in the recess 90 of the coupling pin 91 , which can be snapped into the hole 88 of the tab 89 and secured via the snap latch 58 , forms spring-loaded. The snap latch 58 has the hitch be bolt 91 , which can snap into the bore 88 of the tab 89 . The coupling pin 91 can be adjusted again from its locking position and thus releases the bore 88 of the tab 89 so that it can then be pulled out of the recess 90 . Below the tab 89 is the hitch be element or the associated parallel coupling mandrel 87 , which can also be inserted 58 in the coupling process in a lower recess 92 of the Arretierungsverbin. The recess 92 runs parallel to the recess 90 . The coupling element 87 has at its front end guide surfaces 93 which come into contact with the front edge of a recess 92 with the coupling element 94 and thereby ensure that the tab 89 is then inserted into the recess 90 and the coupling pin 87 into the recess 92 can be. Furthermore, in the area of the opening of the recess 90 and the recess 92, the guide elements 117 having the sliding surfaces 126 can be provided, which expand in a V-shape to the rear and thus facilitate the coupling process for the tab 89 or the coupling mandrel 87 or one Compensate lateral misalignment and / or a vertical misalignment of the pull rod 10 with respect to the coupling element 94 or the three-point coupling 118 . The guide part 117 schematically indicated in FIG. 5 can be provided on each clutch pocket 119 accordingly. The guide part 117 can also be equipped in a funnel shape with straight or curved surfaces.

If the tab 89 and the mandrel 87 are inserted into the corresponding recesses 92 , 90 , the towing vehicle 18 is coupled to the wheelchair 19 and secured at the same time. The coupling element 94 , which is designed as a piece of pipe, is located on the cross member 121 with the displaceably mounted Querträ ger 123 , which is secured by means of the bolt 128 .

In the embodiment of FIG. 6, the guide member 117 is provided in the region of the coupling pocket 119 of the locking connection 58 , which is formed from two horizontally extending with respect to the footprint of the train driving tool 18 and two vertically running guide surfaces, which together form a funnel-shaped Form inlet opening, so that even with an inclined coupling bracket 89 or with a larger lateral offset of the coupling bracket 89 relative to the locking element 58, a coupling process between towing vehicle 18 and wheelchair 19 is also possible for an inexperienced operator. The middle coupling element or the three-point coupling 118 can be used as a coupling element without any modifications to the wheelchair or towing vehicle due to the geous design of the three coupling pockets 119 and the turnbuckle connections 116 without further evidence between differently designed wheelchairs and train driving. As a result, you also get a three-point coupling 118 for a wheelchair that can be produced cost-effectively. The three-point coupling 118 , as can be seen from FIG. 6, can be changed in width due to the adjustable cross members 121 , 123 and adjustable to different inside dimensions of the coupling elements.

Reference list

1 electric motor
5 impeller
6 impeller
7 housing
9 hood
10 drawbars
11 handlebar, strut
12 panels
14 drive wheel
15 drive wheel
16 gears
18 towing vehicle
19 wheelchair
22 jockey wheel
25 ′ axis
47 battery
54 universal joint-like connection
55 axis
56 socket
57 eyelet
58 Snap lock connection, locking connection
68 hinge pin
70 draw latch
71 levers
72 hinge pin
73 eyelet
74 hooks
75 threaded part
76 mother
76 ′ second mother
77 fixed part, strut, lower
78 foldable part, strut, upper
85 bolts
86 bolts
87 Coupling mandrel, coupling element
87 ′ coupling mandrel, coupling element
88 hole
89 tab
90 recess
91 clutch linings
92 recess
93 guide surface
94 coupling element
116 turnbuckle
117 guide part
118 three-point coupling, coupling device
119 clutch bag
121 cross members
123 cross beams
126 guide surface, sliding element
127 plate
128 bolts
129 centering device
130 clamp connection
131 mounting plate
132 hole
134 linkage part
135 linkage part
136 bolts

Claims (24)

1. On a wheelchair ( 19 ) couplable train driving tool ( 18 ), which is equipped with a coupling device ( 115 ) provided between the wheelchair ( 19 ) and the towing vehicle ( 18 ), which at least to the wheelchair ( 19 ) and / or to the Train driving tool ( 18 ) is detachably connected and a position of the towing vehicle permits at least two intersecting axes, characterized in that a coupling device has a coupling part which is designed as a three-point coupling ( 118 ) and at least one coupling pocket ( 119 ) has, which serves to receive a coupling element or coupling mandrel ( 87 ). 2. On a wheelchair ( 19 ) couplable train driving tool ( 18 ) which is provided with a coupling device provided between wheelchair ( 19 ) and towing vehicle ( 18 ) ( 115 ), at least to the wheelchair ( 19 ) and / or to the Train driving tool ( 18 ) is detachably connected and a position of the towing vehicle permits at least two intersecting axes, characterized in that the coupling device ( 118 ) at least one coupling part provided on the towing vehicle ( 18 ) and / or on the wheelchair with a the coupling process facilitating guide part ( 117 ). 3. Apparatus according to claim 1, characterized in that the three-point coupling ( 118 ) has three Aufnah meteile or coupling pockets ( 119 ), the independent hitch on the one hand to the wheelchair ( 19 ) and on the other hand to the train vehicle ( 18 ) detachably connectable is. 4. The device according to claim 1, characterized in that a coupling pocket ( 119 ) with respect to the longitudinal central axis ( 122 ) of the towing vehicle ( 18 ) is arranged centrally. 5. The device according to one or more of the preceding claims, characterized in that two coupling pockets ( 119 ) with respect to the longitudinal central axis ( 122 ) of the towing vehicle ( 18 ) are arranged at a distance from the longitudinal central axis. 6. The device according to one or more of the preceding claims, characterized in that the two coupling pockets ( 119 ) have the same distance from the longitudinal central axis ( 122 ) of the train driving tool ( 18 ). 7. The device according to one or more of the preceding claims, characterized in that two coupling pockets ( 119 ) for receiving coupling elements ( 87 ) on the wheelchair ( 19 ) or on the three-point coupling ( 118 ) are provided and the other coupling pocket ( 119 ) also is directly or indirectly connected to the three-point coupling ( 118 ) or to the towing vehicle ( 18 ). 8. The device according to one or more of the preceding claims, characterized in that the coupling pockets ( 119 ) are tubular. 9. The device according to one or more of the preceding claims, characterized in that the coupling pockets ( 119 ) Arretierungsele elements ( 120 ), via which the coupling elements ( 87 ) are optionally fixable. 10. The device according to one or more of the preceding claims, characterized in that at least one guide part ( 117 ) is provided in the region of the lateral boundary of the clutch pockets ( 119 ). 11. The device according to one or more of the preceding claims, characterized in that the guide part ( 117 ) consists of at least two divergingly arranged sliding elements or guide surfaces ( 126 ). 12. The device according to one or more of the preceding claims, characterized in that a second coupling device has a cardan joint-like connection ( 54 ) which from a towing vehicle ( 18 ) provided vertical axis ( 55 ) with a horizontal, rotatable bushing ( 56 ) There is an eyelet ( 57 ) for receiving a horizontally extending articulated bolt ( 68 ) which is used to connect the pull rod ( 10 ), which forms telescopically and via a snap lock connection ( 58 ) on the first coupling device ( 118 ) is safe bar. 13. The device according to one or more of the preceding claims, characterized in that the locking connection or snap lock connection ( 58 ) consists of an opening or boring ( 88 ) having tab ( 89 ) which is parallel to a guide surface ( 93 ) on pointing coupling element or mandrel ( 87 ) runs, both of which can be inserted into a recess ( 90 , 92 ) of the locking element ( 94 ) belonging to the locking connection, via which the towing vehicle ( 18 ) with the wheelchair ( 19 ) is connectable. 14. The device according to one or more of the preceding claims, characterized in that the locking connection ( 58 ) with the wheelchair ( 19 ) or the three-point coupling ( 118 ) is connected ver. 15. The device according to one or more of the preceding claims, characterized in that the locking connection ( 58 ) with a cross member ( 121 ) of the three-point coupling ( 118 ) is the verbun. 16. The device according to one or more of the preceding claims, characterized in that a cross member ( 121 ) of the three-point coupling ( 118 ) is variable in length and at the end a coupling pocket ( 119 ) each with a clamping closure ( 116 ) and one via a lever arm ( 123 ) operable clamping eyelet ( 124 ). 17. The device according to one or more of the preceding claims, characterized in that the coupling element or the coupling mandrel ( 87 ) is connected to the pull rod ( 10 ) which is connected to the towing vehicle ( 18 ), the pull rod ( 10 ) can be rotated about an approximately horizontal axis in the coupled state relative to the three-point coupling ( 118 ). 18. The device according to one or more of the preceding claims, characterized in that the pull rod ( 10 ) in the coupled state ge compared to the three-point coupling ( 118 ) about an approximately horizontal axis in a win kel range between 1 ° and 360 ° or is rotatable in an angular range between 5 ° and 30 °. 19. The device according to one or more of the preceding claims, characterized in that the pull rod ( 10 ) or the handlebar ( 11 ) for steering the towing vehicle is designed to be buckled and the adjustable parts in the folded-out position of the pull rod ( 10 ) or . The handlebar ( 11 ) via the turnbuckle connection ( 58 , 70 ) can be locked. 20. The device according to one or more of the preceding claims, characterized in that the foldable parts ( 77 , 78 ) of the Zuggestän ges ( 10 ) or the handlebar ( 11 ) in the region of the coupling hook ( 125 ) or the kink opposite Have guide elements ( 126 ). 21. The device according to one or more of the preceding claims, characterized in that the tension lock ( 116 ) on the wheelchair ( 18 ) can be fastened in different positions. 22. The device according to one or more of the preceding claims, characterized in that the coupling pockets ( 119 ) for engaging a coupling element to be coupled ( 87 ) have an angle-enclosing guide surfaces ( 126 ) which diverging in the direction of the coupling element ( 87 ) to be coupled are arranged progressively. 23. The device according to one or more of the preceding claims, characterized in that the guide surfaces ( 126 ) having coupling element of the handlebar ( 11 ) has a centering element ( 129 ). 24. The device according to one or more of the preceding claims, characterized in that the sliding elements ( 126 ) having coupling element has a centering element ( 129 ) arranged centrally with respect to the pull rod or strut ( 77 , 78 ), into which a counterpart is insertable.