DE102019112930A1 - Drive arrangement for a pulling device and pulling device for a mobile seat unit - Google Patents

Abstract

The invention relates to a drive arrangement (12) for a traction device (10) for a mobile seat unit, comprising a handlebar support (14) with a steering arm (16) and a fork part (18), a handlebar (20) being arranged on the steering arm (16) and a drive wheel (22) is arranged on the fork part (18) and the steering arm (16) is mounted on the fork part (18) so as to be pivotable about a pivot axis (S). It is characterized in that the handlebar support (14), in particular the steering arm (16), is designed and / or arranged asymmetrically to the center plane (M) of the drive wheel (22) such that the steering arm (16) is completely or at least partially on a Swivel side (X) of the drive wheel (22) can be swiveled to the side of the drive wheel (22).

Description

The invention is based on a drive arrangement for a traction device for a mobile seat unit, for example a hospital elevator, comprising a handlebar support with a steering arm and a fork part, a handlebar being arranged on the steering arm and a drive wheel being arranged on the fork part, and the steering arm about a pivot axis is pivotably mounted on the fork part.

One of the possibilities of driving such a mobile seat unit, in particular a hospital elevator or a wheelchair, is the use of a traction device. For this purpose, the traction device can usually be connected to the mobile seat unit to be driven. To drive the mobile seat unit, the traction device has a manual and / or a motor drive. In particular, chain drives are used in conjunction with hand cranks. The chain drive drives the drive wheel of the pulling device so that the mobile seat unit connected to the pulling device can be moved.

From the publication DE 10 2016 118 144 A1 a drive arrangement for a traction device for a wheelchair is known. The drive arrangement described there has a handlebar support with a steering arm and a fork part with a drive wheel. The handlebar is designed as a hand crank. The drive wheel can be driven via a drive chain in connection with a torque transmission unit and an output chain. There is also the option of electromotive support.

While such a traction device can enable a user to move about with little effort using a mobile seat unit, the transport of the traction device in connection with the mobile seat unit has so far been difficult. For example, when transporting in a car, the towing device must be loaded into the car in addition to the mobile seat unit, which results in an increased need for storage space in the car.

Due to the most varied of impairments or degrees of severity of the impairments of the user, different operational situations and other circumstances, pulling devices should in principle be designed to be flexible and inexpensive to adapt.

The object of the present invention is therefore to offer an improved drive arrangement for a pulling device as well as a pulling device for a mobile seat unit that is easy to transport, but nevertheless flexibly adaptable.

The object is achieved by a drive arrangement for a traction device for a mobile seat unit, comprising a handlebar support with a steering arm and a fork part, a handlebar being arranged on the steering arm and a drive wheel being arranged on the fork part and the steering arm being mounted on the fork part so as to be pivotable about a pivot axis is, wherein the handlebar support, in particular the steering arm, is designed and / or arranged asymmetrically to the center plane of the drive wheel that the steering arm is completely or at least partially pivotable on a pivot side of the drive wheel up to the drive wheel.

A basic idea of the invention is therefore to design the drive arrangement in such a way that the steering arm can be pivoted as far as possible, in particular as far as next to the drive wheel. Thus, for example for transport, a pulling device equipped with such a drive arrangement can be folded or packed to a particularly small packing size.

It is advantageous if the steering arm can be pivoted completely on the pivot side of the drive wheel as far as next to the drive wheel. Depending on the structural design, however, it is also conceivable that the steering arm can only be pivoted at least partially, for example at least a quarter, preferably at least half, until it is next to the drive wheel.

The handlebar support can be designed asymmetrically in such a way that the steering arm can be pivoted through a particularly large angle without parts of the steering arm hitting other parts of the traction device, in particular against the drive wheel, when pivoting.

The steering arm can be pivotable forwards, that is to say in the direction of the usual direction of travel, and / or to the rear, that is to say against the usual direction of travel. In other words, the pivot axis can run perpendicular to the central plane of the drive wheel.

The pivot side represents the side of the drive wheel, that is, the left or right side of the drive wheel in accordance with the usual direction of travel, along which the steering arm can be pivoted completely or at least partially up to the drive wheel. In this context, “next to the drive wheel” can be understood to mean the area of the respective half-space defined by the center plane of the drive wheel and associated with the pivoting side, which extends from the ground to the upper edge of the drive wheel when the drive wheel is in the upright position that is usual for driving the traction device.

Since the handlebar support, in particular the steering arm, is designed and / or arranged asymmetrically to the central plane of the drive wheel, the pivoting side can be defined by the position of the center of gravity of the handlebar support or the steering arm relative to the central plane of the drive wheel. In particular, the pivot side can be defined in that the volume center of gravity is located in the left or right half-space defined by the center plane.

The steering arm can have at least two steering arm rods. By using several steering arm rods, the rigidity of the steering arm and thus its stability can be improved while at the same time being low in weight. The at least two steering arm rods are preferably arranged and / or can be arranged in the half-space associated with the pivot side. In particular, the steering arm rods can be arranged and / or can be arranged in the same half-space defined by the central plane of the drive wheel. The handlebar can then be arranged and / or guided on two steering arm rods, in particular by means of a handlebar holder located between the two steering arm rods.

To further improve the stability, the steering arm can be arranged and / or supported on the fork part via an additional bracket on the side of the steering bracket opposite the pivoting side. The additional support can have a smaller width than the steering arm. The point of application of the additional support on the steering arm can be selected in such a way that the greatest possible swivel angle is maintained. In particular, the additional support can act on only one of the steering arm rods.

The drive arrangement can have a manual drive. For this purpose, a crank drive, in particular a hand crank, can be arranged and / or formed on the handlebar, wherein the crank drive can be connected to the drive wheel in a torque-transmitting manner via a drive means, in particular a drive chain, a torque transmission unit and an output means, in particular an output chain. The drive means and / or the output means can each preferably be designed as a chain. Alternatively or in addition, however, it is also conceivable to design the drive means and / or the driven means as a belt, rope and / or as a spindle. The drive wheel can thus be driven by actuating the crank drive, with a torque generated at the crank drive being transferable to the drive wheel via the drive means, the torque transmission unit and the output means. A translation or the like can be provided along this path in order to convert the torque generated at the crank in a suitable manner. In particular, the torque transmission unit can be designed as a transmission.

The traction device can be folded up particularly securely if the drive means are guided in the steering arm and / or the output means are guided in the fork part. Thus, for example, when the steering arm is pivoted, the drive means can be safely “stowed”. If the drive means is designed as a drive chain, for example, the drive chain can be prevented from falling off a crank drive gear located on the handlebar during the pivoting of the steering arm. Injuries to the user through contact with the drive means or with the driven means while driving the traction device can also be avoided.

A further saving in space can be achieved if the drive means and the output means are arranged in the same half-space defined by the central plane of the drive wheel, in particular in the half-space belonging to the pivoting side. The drive means and the driven means can thus be guided relatively close to one another. Furthermore, additional space for the arrangement of further elements of the drive arrangement, for example for the arrangement of the torque transmission unit, can be created within the drive arrangement.

The torque transmission unit can have at least one shaft which is arranged coaxially to the pivot axis. Particularly preferably, the torque transmission unit can have at least two shafts arranged coaxially to one another, in particular a drive shaft assigned to the drive means and an output shaft assigned to the output means. In particular, the two shafts can each be arranged coaxially to the pivot axis. This makes it possible to avoid a change in length of the drive means and / or the driven means during the pivoting of the steering arm. For example, in the case of a drive chain and a driven chain, no additional chain tensioner or the like is necessary to compensate for a change in length due to pivoting of the steering arm.

In a particularly preferred class of embodiments of the invention, it is provided that the drive arrangement comprises at least one, in particular electric, motor, wherein the at least one motor can particularly preferably be designed as a hub motor and / or as a central motor. The motor can be designed to support a manual drive. Alternatively or additionally, for example, selectable by a user of the pulling device, the motor can also be used to independently drive the pulling device or a mobile seat unit connected to the traction device. For this purpose, a power selector lever, electrically connected to the motor, for controlling the motor, can be provided on the handlebar. Alternatively or additionally, the power output by the motor can be controllable as a function of a manual power applied by the user and / or a torque applied by the user. In particular, the motor can be controllable and / or controlled in the manner of a pedelec.

A motor designed as a hub motor can in particular be arranged on the hub of the drive wheel. Such a hub motor usually offers the advantage of particularly quiet operation.

A motor designed as a central motor can be operated at speeds (largely) independent of the speed of the drive wheel, in particular by means of a suitable transmission gear. This enables particularly efficient operation of the mid-engine to be achieved. Furthermore, heat problems, for example when driving uphill, can be avoided or reduced more easily than with a hub motor.

The drive arrangement can be particularly flexible and inexpensive to manufacture if a commercially available motor is used as the motor. In particular, it is conceivable to use a commercially available motor for pedelecs as the motor. Pedelec motors of this type are usually matched to torques or forces such as those that occur when a user of a pedelec or the like is used to drive a leg.

Particularly in the case of manually driven or only motorized traction devices, it is common to provide a transmission ratio between the crank drive and the drive shaft and / or a motor shaft of the motor, through which the drive shaft or the motor shaft rotates faster than the (manually operated) crank drive . Furthermore, the torques that can be generated by hand are generally already smaller than the torques that can be generated by leg drive. Therefore, when using a (commercially available) pedelec motor, its torque-dependent power control is not or only inadequately coordinated with the torques that occur or are expected in a traction device on the drive shaft or the motor shaft with such a transmission ratio.

It is therefore advantageous if the transmission ratio between the crank drive and the drive shaft and / or a motor shaft is set such that the speed of the drive shaft and / or the motor shaft is at most as high as the speed of the crank drive. The motor can preferably be designed as a central motor, because in this case a motor of a pedelec that is otherwise designed or usable as a bottom bracket motor can also be used for the drive arrangement.

The motor, designed as a central motor, can be positioned largely freely on the drive arrangement, in particular on the handlebar support. The motor can preferably be arranged adjacent to the torque transmission unit. For this purpose, a drive axis of the motor can be arranged offset parallel to the pivot axis, in particular offset upwards according to the position of use of the traction device. Depending on the torque transmission unit used, this can also be used by the motor. To adapt the torques and / or speeds to be generated by the engine, additional design options arise in the case of a mid-engine. In particular, the motor can act either on the drive means, on the torque transmission unit or on the output means. Furthermore, the arrangement of the motor adjacent to the torque transmission unit facilitates the pivoting of the steering arm.

A tank or battery or the like required for the operation of the motor can be arranged in and / or on the handlebar support, in particular in and / or on the fork part, so that this also enables the steering arm to be pivoted as far as possible and thus a further reduced pack size.

It can be provided that an installation space is formed adjacent to the pivot axis and / or around the pivot axis for receiving the torque transmission unit and / or the at least one motor. The installation space can be designed in particular for modular, optional equipping with a torque transmission unit and / or with at least one motor. Thus, a modular, building block-like system of pulling devices or drive arrangements for pulling devices can be designed.

The installation space can be adapted, in particular dimensioned, to different types of torque transmission units and / or different types of motors. A suitable torque transmission unit or a suitable motor can then be used depending on the requirement situation. Particularly in the case of low power requirements, smaller motors can be used, which also allows the pack size to be reduced.

Furthermore, the pack size that can be achieved for transport purposes can be improved if the handlebar is designed and / or arranged to be displaceable on the steering arm and / or pivotable relative to the latter. This also increases the ease of use for the user. The handlebar or the crank drive arranged and / or designed on the handlebar can also be used as a replacement for an otherwise required chain tensioner, in particular in the case of a drive means designed as a drive chain, by sliding and / or pivoting.

If at least one parking support, in particular one that can be folded up and down laterally, is arranged and / or formed on the handlebar support, in particular on the fork part, the pulling device can be parked independently of the mobile seat unit. The parking support can be folded up to the side for transport to ensure a small pack size.

It is also conceivable that the drive arrangement, in particular the handlebar support, has at least one latching device. The latching device can be designed to releasably fix the steering arm in at least one pivot position. Preferably, a detent position for an end pivot position for use in driving operation, d. H. be provided when the steering arm is folded out. As an alternative or in addition, a further latching position can be provided for an end pivot position for transport, in particular when the towing device is maximally folded. A latching position for a central pivoting position for convenient connection of the pulling device to the mobile seat unit is also conceivable.

A traction device for a mobile seat unit, which comprises a drive arrangement according to the invention, also falls within the scope of the invention.

The mobile seat unit can be a hospital elevator or a wheelchair, a recumbent bicycle or the like. In general, the mobile seat unit can also include vehicles for transporting people, which can usually also be driven at least manually, such as prams or the like.

Further features and advantages of the invention emerge from the following detailed description of the exemplary embodiments of the invention, with reference to the figures of the drawing, which shows details essential to the invention, and from the claims.

The features shown in the drawing are shown in such a way that the special features according to the invention can be made clearly visible. The various features can each be implemented individually or collectively in any combination in variants of the invention.

• 1 ein Zuggerät in ausgeklapptem Zustand in perspektivischer Darstellung von schräg vorne;
• 2 das Zuggerät in ausgeklapptem Zustand in einer Seitenansicht;
• 3 das Zuggerät in ausgeklapptem Zustand in einer Ansicht von vorne;
• 4 das Zuggerät in eingeklapptem Zustand in perspektivischer Darstellung von schräg vorne;
• 5 das Zuggerät in eingeklapptem Zustand in einer Seitenansicht;
• 6 das Zuggerät in eingeklapptem Zustand in einer Ansicht von vorne;
• 7 eine Detailansicht des Ausschnitts VII aus 1 in perspektivischer Darstellung;
• 8 eine Querschnittsansicht des Ausschnitts gemäß 7 und
• 9 eine der 7 entsprechende Detailansicht eines alternativ ausgebildeten Zuggeräts.

Show it:

• 1 a pulling device in the unfolded state in a perspective view obliquely from the front;
• 2 the pulling device in the unfolded state in a side view;
• 3 the pulling device in the unfolded state in a view from the front;
• 4th the pulling device in the folded state in a perspective view obliquely from the front;
• 5 the pulling device in the folded state in a side view;
• 6th the pulling device in the folded state in a view from the front;
• 7th a detailed view of the cutout VII out 1 in perspective view;
• 8th a cross-sectional view of the detail according to 7th and
• 9 one of the 7th Corresponding detailed view of an alternatively designed pulling device.

To simplify understanding, the same reference numerals are used in the following as far as possible for functionally corresponding elements. For reasons of illustration, individual elements are at least partially hidden in individual figures of the drawing, so that not all elements actually visible in a figure can be depicted in the respective figures.

1 , 2 and 3 show a pulling device 10 for a mobile seat unit (not shown) in the unfolded state in a perspective view from the front, in a side view or in a view from the front.

Like in particular from 1 can be seen, the pulling device 10 a drive assembly 12 on. The drive arrangement 12 includes a handlebar post 14th with a steering arm 16 and a fork part 18th . On the steering arm 16 is a handlebar 20th arranged.

On the fork part 18th is a drive wheel 22nd arranged, in particular rotatably mounted.

The steering arm 16 is about a pivot axis S. swiveling on the fork part 18th stored. He has two steering arm rods 24 on. The steering arm rods 24 run parallel to each other.

On the handlebars 20th a crank drive, in particular a hand crank, is designed. The crank drive has two connecting rods for this purpose 26th with handles (in 1 not shown) and a crank drive gear 28 on.

2 shows that around the crank drive gear 28 around a drive chain 30th is led. The drive chain 30th is made by the two steering arm rods 24 through to a drive blade 32 guided. The drive blade 32 is also designed as a gear. It is coaxial with the pivot axis S. arranged.

Coaxial to the drive blade 32 and coaxial to the pivot axis S. is a drive blade 34 arranged. The output blade 34 is in turn via an output chain 36 with one with the drive wheel 22nd connected ring gear 38 connected. It is conceivable instead of the ring gear 38 to use a simple gear.

In the area of the drive blade 32 and the output blade 34 is also an engine 40 arranged.

How out 3 can be seen through the drive wheel 22nd a middle plane M. Are defined. The two steering arm rods 24 are located according to the illustration of 3 in the left, through the middle plane M. formed half-space H . Accordingly, according to the representation of the 3 the left side of the drive wheel 22nd , i.e. the right side of the drive wheel as seen in the usual direction of travel 22nd , a swivel side X represent.

Out 3 it can also be seen that the drive assembly 12 two parking supports 42 has, each to the side of the drive wheel 22nd or from the drive arrangement 12 can be turned off and can be adjusted to these. For detachable fixing of the parking supports 42 are also each locking lever 44 on the fork part 18th provided, of which in 3 just a locking lever 44 is shown.

4th , 5 and 6th show the pulling device 10 with its drive arrangement 12 when folded.

To do this, show again 4th a perspective view obliquely from the front, 5 a side view and 6th a view from the front of the pulling device 10 or its drive arrangement 12 .

To improve the stability of the steering arm 16 is - like out 4th visible - an additional support 46 provided over which the steering arm 16 on the swivel side X ( 3 ) opposite side on the fork part 18th , in particular also around the pivot axis S. pivotable, is mounted.

It can be seen in particular that the additional support 46 is narrower than the steering arm 16 . In particular, the additional support 46 only one of the two steering arm rods 24 corresponding width. This makes it possible for the additional support 46 only on the upper of the two steering arm rods 24 attacks.

5 shows that the steering arm 16 in the illustrated collapsed state of the drive arrangement 12 at least partially on the pivot side X ( 3 ) - in the representation according to 5 so on the front of the drive wheel 22nd lying side of the drive wheel 22nd - until next to the drive wheel 22nd is pivoted. In particular, according to the illustration of FIG 5 lower steering arm rod 24 next to the drive wheel 22nd .

This is possible because of the steering arm 16 with its two steering arm rods 24 suitable asymmetrical to the central plane M. ( 3 ) of the drive wheel 22nd is trained. In particular, there are both steering arm rods 24 in the same, through the middle plane M. formed half-space H ( 3 ), ie the one on the swivel side X ( 3 ) associated half-space. In addition, there is also the drive chain 30th ( 2 ) and the output chain 36 ( 2 ) in half space H .

At an angle to the central plane M. extending parts that a pivoting of the steering arm 16 would hinder and / or restrict, are thus at least largely, in particular with the exception of the additional support 46 ( 4th ), has been eliminated.

It can thus be seen that the pulling device 10 can be folded to a small pack size.

The pack size can be further reduced by using the parking supports 42 on the side of the drive wheel 22nd be folded.

Also shows 5 that the handlebars 20th with its crank drive gear 28 and the hand crank 26th via a handlebar bracket 48 on the two steering arm rods 24 , especially along the steering arm rods 24 displaceable, is arranged. A clamping mechanism (in 5 not shown) the handlebar bracket 48 detachable on the two steering arm rods 24 establish.

Furthermore is the handlebar 20th pivotable and in particular releasable on the handlebar bracket 48 set.

These additional setting options allow the drive arrangement 12 or the pulling device 10 , in particular in the unfolded state, to further adapt to the needs of a user of the mobile seat unit.

In the in 5 - and also in 6th - Shown, collapsed state, the pack size can be additionally reduced by these adjustment options, for example by the handlebar bracket 48 as far forward as possible, i.e. according to the illustration of 5 to the right, is moved. In addition, the handlebars 20th be pivoted downwards, for example until it reaches the front wheel 22nd hugs.

7th shows a detailed view of the section VII out 1 .

The drive blade can be seen 32 and the output blade 34 , both coaxial with each other and coaxial with the pivot axis S. are arranged.

The engine, designed as an electric mid-engine, can also be seen 40 . The motor 40 sits in a space correspondingly dimensioned for this purpose 50 .

8th FIG. 11 shows a cross-sectional view of the detail according to FIG 7th after which the drive blade 32 non-rotatably on a drive shaft 52 sits.

The output blade 34 in turn, sits non-rotatably on an output shaft 54 .

The drive shaft 52 and the output shaft 54 are coaxial with one another and each coaxial with the pivot axis S. arranged.

Over the two waves 52 , 54 can be a torque from the drive blade 32 on the output blade 34 transfer. The drive shaft thus acts 52 and the output shaft 54 together as a torque transmission unit. It is conceivable that the two waves 52 , 54 are connected to each other via a transmission so that they can be operated at different speeds.

Furthermore, the output blade 34 via the output shaft 54 with an additional one, from the engine 40 generated torque are applied.

After all, in 9 a further embodiment of a traction device for a mobile seat unit shown in a schematic representation.

In particular shows 9 one of the 7th Corresponding detailed view of this alternative embodiment, with the output blade for reasons of illustration 34 is shown for simplicity as a disk.

This embodiment largely corresponds to the embodiment of the pulling device described above 10 .

It differs essentially in that the installation space 50 now instead of the engine 40 ( 7th ) an additional gear 56 is installed. The additional gear forms 56 the torque transmission unit of this embodiment. There is thus an additional setting option for adapting the transmission ratios between the crank drive and the drive blade 32 , the output blade 34 and / or the drive wheel 22nd ( 1 ) and thus to adapt the resulting speed of the drive wheel 22nd or its usable torque for a trip.

This embodiment can in particular be used in conjunction with one on the drive wheel 22nd arranged hub motor can be used.

List of reference symbols

10

Pulling device

12

Drive arrangement

14th

Handlebar post

16

Steering arm

18th

Fork part

20th

Handlebars

22nd

drive wheel

24

Steering arm rod

26th

Connecting rod

28

Crank drive gear

30th

Drive chain

32

Drive blade

34

Output blade

36

Output chain

38

Ring gear

40

engine

42

Parking support

44

Locking lever

46

Additional support

48

Handlebar mount

50

Installation space

52

drive shaft

54

Output shaft

56

Additional gear

H

Half space

M.

Middle plane

S.

Swivel axis

VII

section

X

Swivel side

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102016118144 A1 [0003]

Claims (14)

Drive arrangement (12) for a traction device (10) for a mobile seat unit, comprising a handlebar support (14) with a steering arm (16) and a fork part (18), a handlebar (20) being arranged on the steering arm (16) and on the fork part (18) a drive wheel (22) is arranged and the steering arm (16) is mounted on the fork part (18) such that it can pivot about a pivot axis (S), characterized in that the handlebar support (14), in particular the steering arm (16), is designed and / or arranged asymmetrically to the central plane (M) of the drive wheel (22) so that the steering arm (16) can be pivoted completely or at least partially on a pivot side (X) of the drive wheel (22) up to the drive wheel (22). Drive arrangement according to Claim 1 , characterized in that the steering arm (16) is supported and / or supported on the fork part (18) via an additional support (46) on the side of the steering support (14) opposite the pivoting side (X). Drive arrangement according to one of the preceding claims, characterized in that a crank drive, in particular a hand crank, is arranged and / or formed on the handlebar, the crank drive via a drive means, in particular a drive chain (30), a torque transmission unit and an output means, in particular an output chain (36) with which the drive wheel (22) is connected in a torque-transmitting manner. Drive arrangement according to one of the preceding claims, characterized in that the drive means are guided in the steering arm (16) and / or the output means are guided in the fork part (18). Drive arrangement according to one of the preceding claims, characterized in that the drive means and the output means are in the same half-space (H) defined by the central plane (M) of the drive wheel (22), in particular in the half-space (H) belonging to the pivoting side (X), are arranged. Drive arrangement according to one of the preceding claims, characterized in that the torque transmission unit has at least one shaft which is arranged coaxially to the pivot axis (S). Drive arrangement according to one of the preceding claims, characterized in that the torque transmission unit has at least two shafts arranged coaxially to one another, in particular a drive shaft (52) assigned to the drive means and an output shaft (54) assigned to the output means. Drive arrangement according to one of the preceding claims, characterized in that the drive arrangement (12) comprises at least one, in particular electric, motor (40), the at least one motor (40) being particularly preferably designed as a hub motor and / or as a central motor. Drive arrangement according to one of the preceding claims, characterized in that the transmission ratio between the crank drive and the drive shaft (52) and / or a motor shaft of the motor (40) is set such that the speed of the drive shaft (52) and / or the motor shaft is at most is as high as the speed of the crank drive, the motor (40) preferably being designed as a central motor. Drive arrangement according to one of the preceding claims, characterized in that the motor (40) is arranged adjacent to the torque transmission unit, with a drive axis of the motor preferably offset parallel to the pivot axis (S), in particular offset upwards according to the position of use of the traction device (10) is. Drive arrangement according to one of the preceding claims, characterized in that an installation space (50) is formed adjacent to the pivot axis (S) and / or around the pivot axis (S) to accommodate the torque transmission unit and / or the at least one motor (40). Drive arrangement according to one of the preceding claims, characterized in that the link (20) is designed and / or arranged to be displaceable and / or pivotable relative to the steering arm (16). Drive arrangement according to one of the preceding claims, characterized in that at least one support (42), in particular that can be folded in and out laterally, is arranged and / or formed on the handlebar support (14), in particular on the fork part (18). Pulling device (10) for a mobile seat unit, for example a hospital elevator, comprising a drive arrangement (12) according to one of the preceding claims.

Images