CN112996710A

CN112996710A - Transport device, in particular a buggy

Info

Publication number: CN112996710A
Application number: CN201980075977.0A
Authority: CN
Inventors: E·鲁普雷希特; N·马丁; B·云林
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2018-09-20
Filing date: 2019-07-22
Publication date: 2021-06-18
Also published as: WO2020057810A1; DE102018216005A1; EP3853099A1

Abstract

The invention relates to a transport device, in particular a buggy, having at least three wheels and a handle for a user, wherein at least one wheel is designed as a drive wheel with an associated electric drive unit (140) in order to be able to carry out an at least partially electric support of the transport device in an operating state for a manual pushing or pulling operation by the user, and wherein a locking device (150) having at least one locking element (350) is assigned to the at least one drive wheel, wherein the at least one locking element (350) is designed to prevent the at least one drive wheel from rotating in the locked state, and wherein at least two activation devices (366, 367) are assigned to the locking device (150), wherein a first activation device (366) is designed to automatically electromagnetically activate the locking device (150), and wherein the second activation means (367) is configured for manually activating the locking means (150) by a user.

Description

Transport device, in particular a buggy

Technical Field

The invention relates to a transport device, in particular a buggy, having at least three wheels and a handle for a user, wherein at least one wheel is designed as a drive wheel with an associated electric drive unit in order to be able to carry out an at least partially electric support of the transport device in an operating state for a manual pushing or pulling operation of the transport device by the user, and wherein a locking device with at least one locking element is assigned to the at least one drive wheel, wherein the at least one locking element is designed to prevent the at least one drive wheel from rotating in the locked state.

Background

From the prior art, a transport device designed as a buggy is known, which has an electric drive for actively supporting a user in a pushing or pulling operation by means of an electric motor. Here, such a buggy has at least three wheels and a handle for the user. Of the at least three wheels, at least one wheel can be driven as a drive wheel by means of an electric drive unit.

Furthermore, it is known to provide a mechanical parking brake or brake device which can be actuated by means of foot pedals or foot pedals on conventional movement devices which are not supported in an electrically powered manner for a push-pull operation and on the corresponding buggy. These parking brakes or braking devices are used to inhibit uncontrolled rolling of the transport device, for example for loading or unloading processes or for parking on inclined ground.

Disclosure of Invention

The invention relates to a transport device, in particular a buggy, having at least three wheels and a handle for a user, wherein at least one wheel is designed as a drive wheel with an associated electric drive unit in order to be able to carry out an at least partially electric support of the transport device in an operating state for a manual pushing or pulling operation of the transport device by the user, and wherein a locking device having at least one locking element is assigned to the at least one drive wheel, wherein the at least one locking element is designed to prevent the at least one drive wheel from rotating in the locked state. At least two activation devices are associated with the locking device. The first activation device is designed to automatically electromagnetically activate the locking device and the second activation device is designed to manually activate the locking device by a user.

The invention thus makes it possible to provide a transport device with a locking device for which a simple and compact construction can be achieved by means of two activation devices of the locking device. Thereby, a safe and reliable transport device can be provided, since uncontrolled travel movements of the transport device can be prevented.

The associated electric drive unit is preferably arranged in a housing, wherein the housing has a first housing part which is arranged on the transport device in a non-rotating manner and a second housing part which is connected to the first housing part in a rotationally movable manner, wherein the locking device is assigned to the first housing part, and wherein the at least one locking element is designed to prevent rotation of the second housing part in the locked state. A suitable arrangement of the locking means can thus be achieved in a simple manner.

Preferably, the at least one locking element can be at least partially positively engaged in a locking state with an engagement geometry provided on the second housing part, and the engagement geometry is preferably configured in the manner of a hole circle. Thus, a reliable and secure locking of the locking element can be achieved.

According to one embodiment, a rotary disk is provided, wherein the at least one locking element can be moved axially into the locked state or into the released state by rotation of the rotary disk. A simple and uncomplicated arrangement of the locking element in the locked state or in the released state can thus be achieved.

The rotary disk preferably has a bevel on its end facing the at least one locking element, wherein the at least one locking element moves axially along the bevel when the rotary disk rotates. The result of loading the blocking element into the locked state can thus be achieved in a simple manner, irrespective of which activation device activates the locking device.

Preferably, the first activation device has, for the automatic activation of the locking device, an energized cylinder magnet which can be controlled by the control device, wherein the cylinder magnet is designed to rotate the rotary disk. Thus, the locking means can be activated safely and reliably by said first activation means.

Preferably, the second activation device has a pedal unit with a manually operable pedal and a pivot shaft, wherein the pivot shaft is connected in rotation to the pedal and to the rotary disk. Thus, the activation of the locking means or the rotation of the turntable can be achieved easily and without complications by the second activation means.

According to one embodiment, the pivot shaft is connected at its free end to a pivot lever which is arranged in the radial direction of the pivot shaft relative to the pivot shaft, wherein the pivot disk has a receptacle at its end facing the pedal, and wherein the pivot lever is arranged at least in sections in the receptacle for twisting the pivot disk. Thus, the rotation of the turntable can be safely and reliably achieved by the second activation means.

Preferably, a shaft receptacle is provided, which has an inner receptacle for arranging the pivot shaft and the free end of the pivot lever. The rotation of the turntable can thus be realized in a simple manner by means of the pivot axis.

Preferably, the turntable is arranged on the outer circumference of the shaft receiving portion. A space-saving arrangement of the rotary disk can thus be achieved.

The second activation device is preferably configured to: the user-initiated changeover of the at least one locking element from the released state into the locked state can be effected by the user by switching the pedal into the locked position. Thus, a manual activation of the locking means can be achieved.

The switching from the locked state into the released state can preferably only be performed by actuating the second activation device, in particular by a user switching a pedal assigned to the second activation device into the released position. This prevents an undesired release of the locking device, in particular due to an incorrect knowledge of the state of the transport device by means of a control device associated with the transport device.

According to one embodiment, a shaft unit is provided with two drive wheels, which are connected to each other by a shaft, wherein at least one swivel shaft is arranged inside the shaft, and wherein the two drive wheels can be locked simultaneously by the at least one swivel shaft when the locking device is activated. In a simple manner, a reliable transport device can thus be provided, wherein undesired movements can be prevented by locking the two drive wheels.

Drawings

In the following description, the invention is explained in detail by means of embodiments illustrated in the drawings. Wherein:

figure 1 shows a schematic side view of a transport device which is exemplary constructed as a buggy,

fig. 2 shows a perspective view of a shaft unit assigned to the transport device of fig. 1, which shaft unit has a locking device,

fig. 3 shows a cut-out of an exploded view of the shaft unit of fig. 2, for illustrating the locking device,

figure 4 shows a perspective view of the locking device associated with the shaft unit of figure 3,

fig. 5 shows a perspective view of the locking device of fig. 4, with the first and second activation devices,

FIG. 6 shows a perspective view of the locking device of FIG. 5 in the locked state, and

fig. 7 shows a perspective view of the locking device of fig. 5 and 6 in a released state.

Detailed Description

Fig. 1 shows a transport device 100, which is designed as a buggy and is referred to below as "buggy 102". The stroller 102 preferably has at least three wheels 120, 122, 124 for movement on the ground 116. The three wheels 120, 122, 124 are preferably rotatably arranged on the frame 106, which has a handle 112 for a user, not shown. Here, the wheel 122 lying in front of the plane of the drawing covers the wheel 124 lying behind the plane of the drawing, wherein the wheels 122, 124 are arranged axially offset along the common axis 110. It should be noted that the stroller 102 can also have four wheels.

At least one of the preferably three wheels 120, 122, 124 is preferably configured as a drive wheel 130, 132. Preferably, an

electronic drive unit

140, 142 is associated with each of the drive wheels 130, 132, which electronic drive unit is designed to drive the respective drive wheel. The two exemplary rear wheels 122, 124 of the stroller 102 are preferably implemented as drive wheels 130, 132. The drive wheels 130, 132 can preferably be driven independently of one another by means of an

electric drive unit

140 or 142, respectively. The

drive units

140, 142 are preferably arranged in a housing (239 in fig. 2).

By means of the two drive wheels 122, 124, the stroller 102 can be supported in the support mode at least partially electrically by a manual pushing or pulling movement by the user. In this case, the buggy 102 is moved essentially in a pushing direction or pulling direction 114 relative to the ground 116.

For adjusting the

electric drive units

140, 142, the buggy 102 preferably has an electronic control and/or adjustment device 160. The electronic control and/or regulating device 160 is preferably designed to control and/or regulate two

exemplary drive units

140, 142. However, each

drive unit

140, 142 can also have its own electronic control and/or regulating device 160.

The

electric drive units

140, 142 are preferably realized without a transmission by means of permanently excited direct current motors. According to one specific embodiment, each of the

drive units

140, 142 has an electronically commutated motor, which in turn has a rotor (320 in fig. 3) and a stator (330 in fig. 3).

According to the invention, the transport device 100 has a locking device 150, which is associated with two drive wheels 130, 132, which are provided here by way of example. The locking device 150 is preferably designed to lock or block at least one drive wheel 130, 132. Preferably, the locking device is configured for locking the two drive wheels 130, 132.

In this case, the unlocking of the locking device 150 is preferably only possible by the user.

Fig. 2 shows a shaft unit 230 assigned to the transport device 100 of fig. 1, which preferably has two drive wheels 130, 132. The two drive wheels 130, 132 and their

drive units

140, 142 are connected to one another by a shaft 260. The shaft unit 230 has an exemplary left first axial end 231 and an exemplary right second axial end 232. Here, the drive wheel 130 with its drive unit 140 is arranged, for example, on a first end 231 of the shaft unit 230, and the drive unit 142 of the drive wheel 132 is arranged on a second end 232 of the shaft unit 230.

The axle unit 230 is preferably arranged on the frame 106 of the transporter 100 or buggy 102. The frame 106 preferably has connecting elements 211, 212, which are designed to connect the wheels 120, 122, 124, in particular the drive wheels 130, 132, to the transport device 100. The connecting elements 211, 212 preferably have a slightly elongated base body with a first end 213 facing the transport device 100 and an opposite free end 214 facing the respective wheel 20, 122, 124. The connecting elements 211, 212 are preferably each connected at their second end 214 to the shaft unit 230 via a fastening element 222.

Furthermore, the transport device 100 preferably has a central power supply 217. Preferably, the power supply is designed as a battery unit. In this case, the battery unit 217 is preferably arranged on the vehicle frame 106 and particularly preferably on one of the connecting elements 211, 212. The battery cells 217 are arranged on the exemplary left-hand connecting element 211, for example, by means of a retaining plate 215. The battery unit 217 preferably has an on/off switch 218, which is designed to activate the power supply. Furthermore, the battery unit 217 preferably has a connection terminal 219 for connecting the transportation device 100 to an external device, for example, a smartphone. Preferably, the battery unit 217 is connected to at least one drive wheel 130, 132 via an electrical connection 220. According to one embodiment, the two drive wheels 130, 132 are connected to the battery unit 217, wherein the electrical connection is arranged within a shaft 260 associated with the shaft unit 230.

According to one specific embodiment, the respectively associated

electric drive units

140, 142 are arranged in a housing 239. The housing 239 preferably has a first housing part 237, which is not rotatable and is arranged on the transport device 100, and a second housing part 236, which is connected to the first housing part 237 in a rotationally movable manner. Preferably, the locking device 150 is assigned to the first housing part 237. In this case, the locking device 150, in particular a locking element (350 in fig. 3) associated with the locking device 150, is preferably designed to prevent the second housing part 236 from rotating in the locked state. Furthermore, it is preferred to lock both drive wheels 130, 132 simultaneously when the locking device 150 is activated.

Preferably, drive wheel 130 has a rim 235 with a tire 234. In this case, the wheel rim 235 is preferably arranged on the second housing part 236. Further, a pedal unit 250 having a manually operable pedal 251 is preferably provided. The pedal unit 250 is preferably arranged here between the two drive wheels 130, 132 or drive

units

140, 142. Here, the pedal unit 250 is preferably integrated into the shaft 260 of the shaft unit 230.

Preferably, the pedal unit 250 is fixed to the shaft 260 by two pedal-carrying

parts

252, 253. The two

pedal carrying parts

252, 253 are preferably connected to each other, for example by a threaded connection. Furthermore, the pedal supports 252, 253 are preferably connected to the shaft 260 by means of a connecting element, for example a screw connection. The shaft 260 and the pedal-carrying

parts

252, 253 are preferably connected to one another in a rotationally fixed manner. Furthermore, a pivot shaft (355 in fig. 3) is preferably arranged inside the shaft 260, which is preferably designed as a tube, and is connected to the pedal 251 in a rotationally movable manner.

Fig. 3 shows the shaft unit 230 of fig. 2 with the drive unit 140, the pedal unit 250 and the shaft 260 and shows the locking device 150. Preferably, at least one locking element 350 is associated with the locking device 150. Preferably, at least one locking element 350 is associated with each drive wheel 130, 132. In this case, the at least one locking element 350 is preferably designed to prevent the at least one drive wheel 130, 132 from rotating in the locked state.

Preferably, at least two activation devices 366, 367 are associated with the locking device 150. The first activation device 366 is preferably designed for automatically, electromagnetically activating the locking device 150, and the second activation device 367 is designed for manually activating the locking device 150 by a user.

The locking device 150 is preferably assigned to the first housing part 237, wherein the at least one locking element 350 is designed to prevent the second housing part 236 from rotating in the locked state. For this purpose, the second housing part 236 has a preferably cylindrical base body 310 with a fitting geometry 313. The engagement geometry 313 is preferably arranged on a flange 311 formed radially centrally on the base body 310. The base body 310 and the flange 311 are preferably designed in one piece, but can also be connected to one another by any connecting means, for example a screw connection.

The engagement geometry 313 is preferably formed on the side of the second housing part 236 facing the pedal unit 250. The interlocking geometry 313 is preferably designed in the manner of a hole circle. Preferably, the hole circle has a plurality of voids 312. The locking element 350 is preferably at least partially form-fittingly engageable with the engagement geometry 313 in the locked state.

The

drive units

140, 142 preferably have electronically commutated motors having a rotor 320 and a stator 330. The rotor 320 is connected to the second housing part 236. For this purpose, the second housing part 236 or the cylindrical base body 310 preferably has an inner receptacle for the arrangement of the rotor 320. The rotor 320 preferably includes a plurality of permanent magnets 322. The permanent magnets 322 are preferably arranged on the inner receptacle at circumferential sides uniformly spaced apart from one another and directed radially inward.

Preferably, the stator 330 is connected to the first housing part 237 via a stator carrier 340. The stator carrier 340 preferably has a plurality of electrical windings 332 and is connected in a rotationally fixed manner to the frame 106 of the buggy 102. In this case, the electrical winding 332 is preferably arranged on the winding carrier 331. The individual windings 332 are preferably coupled into a motor winding by a connection plate 335. In this case, the connecting plate 335 is arranged on the end of the stator 330 facing the first housing part 237. Furthermore, the stator carrier 340 has a preferably cylindrical support section 339, by means of which the stator carrier 340 is centered in the first housing part 237.

The stator carrier 266 has, for example, a pot-shaped base body 341 on its end facing the first axial end 231, which base body tapers in the direction of the second axial end 232 of the shaft unit 230 into a cylindrical receiving region 339 via a bottom surface 349 of the base body 341 facing the second end 232. The cylindrical receiving region 344 is preferably designed to mount the stator 330 or the stator carrier 340 in the shaft 260 associated with the transport device 100. In particular, the stator 330 or the stator carrier 340 is preferably connected to the first housing part 237 by a screw connection. However, the stator carrier 340 can also be connected to the first housing part 237 by any other connection. The cylindrical receiving region 344 preferably has an inner receiving portion, which is preferably designed for the arrangement of a journal.

The first housing part 237 preferably has a pot-shaped base body with an inner receptacle and an axial extension formed in the direction of the first end 231 of the shaft unit 230. In this case, an electronics unit 370 is preferably arranged in the interior receptacle. The electronic unit 370 preferably has at least one circuit board 370 with at least one sensor element. The first housing part 237 has a cover 375 on its end facing the pedal unit 250, which is designed to protect the electronic device from moisture and/or particles that may be introduced.

According to one embodiment, the at least one sensor element is a magnet sensor. The at least one sensor element is preferably arranged in an axial extension of the first housing part 237. In this case, the sensor elements generate signals assigned to the

drive units

140, 142, in particular for controlling the

drive units

140, 142, as a function of the ring magnet 399 assigned to the second housing part 236.

The stator carrier 340 preferably has a receptacle 342 on its bottom surface 349, which is formed along the radial direction 303. The receptacle 342 is preferably designed as a recess and is designed to receive an axial extension of the first housing part 237. Here, the axial expansion passes through the receiving portion 342. Preferably, the axial expansion and the receptacle 342 are arranged concentrically with respect to the receptacle region 344.

Furthermore, the bottom surface 349 preferably has a recess 343 for at least partially receiving the locking element 350. In this case, the locking element 350 is arranged in the recess 343 in a guidable manner by means of a guide sleeve (451 in fig. 4). It should be noted that the locking device 150 can also have more than one locking element 350.

According to one embodiment, a turntable 360 is provided. The rotary disk 360 preferably has a cylindrical base body with an inner receptacle 363 and a radially outwardly directed expansion section 364. The expansion section 364 preferably has a bevel 361 at its end facing the first end 231 or the locking element 350. The expansion section 364 has a receptacle 362 at its end facing the second end 232.

The locking element 350 is preferably axially movable into a locked state or into a released state by rotation of the dial 360. For this purpose, the locking element 350 is preferably designed as a spring-loaded structure. Preferably, the dial 360 is spring loaded into a locked state. The locking element 350 preferably moves axially along the ramp 361 as the dial 360 rotates.

The second activation device 367 preferably has a pedal unit 250 with a manually operable pedal 251 and a pivot axis 355. Preferably, there is a mechanical connection between the locking member 350 and the pedal 251. The pivot axle 355 preferably has a slightly elongated base body with a first end 301 facing the locking element 350 and a second end 302 facing the pedal unit 250. Preferably, the pivot shaft 355 is arranged within the preferably tubular shaft 260. Preferably, two pivot axes 355 are provided, wherein the pivot axes 355 are assigned to the drive wheels 130, 132, respectively. A pivot shaft 355 is preferably arranged between the turntable 360 and the pedal unit 250, wherein the two pivot shafts 355 are preferably connected to one another by means of the pedal 251. However, it is also possible to provide only one pivot shaft 355 which connects the two drive wheels 130, 132 or the rotary discs 360 associated with the respective drive wheel 130, 132 to one another and is connected to the pedal unit 250 or to the pedals 251 in a rotationally movable manner.

The pivot shaft 355 or pivot shaft is preferably connected to the pedal 251 and the rotary plate 360 in a rotationally movable manner. According to one embodiment, the two

pedal carrying portions

252, 253 form an inner receptacle 392. The pivot shaft 355 is preferably arranged in the inner receptacle 392 in sections at its second end 302. Here, a rotation receiving element 393 is preferably associated with the pedal 251, which rotation receiving element 393 is designed to transmit the movement of the pedal 251 to the pivot shaft 355. The swing shaft 355 is rotatably connected to the pedal 251 by a rotation receiving member 393.

The pivot shaft 355 is preferably connected at its free end 301 to a pivot lever 385 which is arranged in the radial direction 303 of the pivot shaft 355 relative to the pivot shaft 355. In order to rotate the rotary disk 360, the wobble lever 385 is preferably arranged at least in sections in the receptacle 362 of the rotary disk 360.

Furthermore, a shaft receptacle 382 with a preferably cylindrical base body is provided, which has an inner receptacle 386 for arranging the swivel shaft 355 and the free end 301 of the swivel lever 385. Swing shaft 355 and swing rod 385 are preferably connected to each other by a threaded connection. However, the pivot shaft 355 and the pivot lever 385 can also be formed in one piece. Furthermore, the shaft receptacle 382 preferably has a recess 383 on its outer circumference 387, in which the wobble lever 385 is arranged. Furthermore, the rotary disk 360 is preferably arranged on the outer circumference 387 of the shaft receptacle 382, in particular on the end of the shaft receptacle 382 facing the first end 231.

Preferably, the second activation device 367 is configured to: the at least one locking element 350 can be moved from the released state into the locked state upon actuation by the user in such a way that the pedal 251 is moved into the locked position on the part of the user. The transition from the locked state to the released state can preferably only be performed by actuation of the second activation means 367. This is preferably done by the user switching the pedal 251 assigned to the second activation means 367 into the release position.

The first activation device 366 preferably has an energized cylinder magnet 368 for automatically activating the locking device 150. The cylindrical magnet 368 is preferably arranged on the stator carrier 340 via a holding device 365. Here, the cylindrical magnet 368 is arranged on the stator carrier 340 in such a way that the cylindrical magnet 368 releases or prevents the rotary disk from rotating. The energized cylindrical magnet 368 is preferably controllable by the control device 160. Preferably, the cylindrical magnet 368 is configured to rotate the turntable 360.

Fig. 4 shows the shaft unit 230 with the locking device 150 of fig. 2 and 3 and shows the arrangement of preferably two swivel shafts 355 between the respective swivel disc 360 and pedal unit 250. Here, the first end 301 of the pivot shaft 355 is arranged in the recess 411 of the rotation receiving element 393. In this case, the pivot axis 355 is configured to form fit with the recess 411. Preferably, the preferably two rotation receiving members 393 are disposed in the sleeve 420. The sleeve 420 is preferably connected to the pedal 251 or can be constructed in one piece therewith.

Fig. 4 furthermore shows a locking element 350 arranged in the guide sleeve 451. The guide sleeve 451 is arranged in a recess 343 in the bottom 349 of the stator carrier 340, wherein the stator carrier 340 is not shown for the sake of clarity of the drawing. Preferably, the guide sleeve 451 is made of plastic.

Fig. 4 also shows a spring element 435 associated with the rotary disk 360. The spring element 435 is arranged in an inner receptacle 363 of the cylindrical base body of the rotary disk 360. Preferably, the spring element 435 is arranged in the inner receptacle 363 in a gap which is formed between the rotary disk 360 and the shaft receptacle 382. Preferably, the spring element 435 is designed as a torsion spring.

Fig. 5 shows the shaft unit 230 with the locking device 150 from fig. 4 when the locking device 150 is triggered electromechanically or by the first activation device 366. In this case, the exemplary left cylindrical magnet 368 is released by the control device 160, wherein the cylindrical magnet 368 or a tappet associated with the cylindrical magnet 368 is moved along arrow 511. Thereby releasing the exemplary left dial 360. The rotary disk 360, which is preloaded by the spring element 435 from fig. 4, is preferably rotated into the locking position in the direction of the arrow 512 or counterclockwise. In this case, the locking element 350 is loaded axially along the ramp 361 or in the direction of the arrow 513 into the engagement geometry 313 of the second housing part 236.

By rotating, the pivot shaft 355 is simultaneously twisted by the arrangement of the pivot lever 385 on the rotary disk 360, wherein the rotation receiving element 393 rotates together with the pivot shaft 355 and thereby moves the pedal 251 into the locking position. By means of the movement of the pedal 251, the exemplary right pivot shaft 355 is preferably rotated simultaneously with the exemplary left pivot shaft 355, wherein the exemplary right rotary disk 360 is rotated in the direction of the arrow 512 into the locking position and the locking element 350 is thereby loaded along the bevel 361 of the rotary disk 360 into the locking position or into the engagement geometry 313 of the second housing part 236.

Fig. 6 shows the shaft unit 230 with the locking device 150 of fig. 4 when the locking device 150 is mechanically triggered or when triggered by the second activation device 367. Here, the pedal 251 is moved by the user of the buggy 102 in the direction of arrow 611. In this case, the two pivot axes 355 are twisted and the rotary disk 360 is released, whereby the rotary disk 360 is preferably twisted into the locking position or in the direction of the arrow 512 by means of the respective spring element 435. In this case, the locking element 350 is preferably loaded axially along the ramp 361 or in the direction of the arrow 513 into the engagement geometry 313 of the respective second housing part 236.

Fig. 7 shows the shaft unit 230 with the locking device 150 of fig. 4 to 6 when the locking device 150 is mechanically released. Here, the pedal 251 is moved by the user of the buggy 102 in the direction of arrow 711. The direction of the arrow 711 is preferably opposite to the direction of the arrow 611 of fig. 6. In this case, the two pivot axes 355 and the turntable 360 are preferably twisted in the direction of the arrow 712 or, as an example, clockwise. In this case, the locking element 350 is released, as a result of which it is moved along the ramp 361 or in the direction of the arrow 713 into the release position. In this case, the locking element 350 is preferably moved out of the engagement geometry 313 of the respective second housing part 236 in the axial direction or in the direction of the arrow 713.

It should be noted that the movement or direction of the

arrows

512, 513, 611, 711, 712, 713 can also be in the opposite direction. In this case, for example, the actuation of the pedal 251 can be guided in the direction of the arrow 711 into a locking position and the actuation of the pedal 251 can be guided in the direction of the arrow 611 into a release position. Furthermore, a twisting of the dial 360 in the direction of arrow 712 or exemplary clockwise can move the locking device 150 into the locked position, and a twisting of the dial 360 in the direction of arrow 512 or exemplary counterclockwise can move the locking device 150 into the released position.

Claims

1. Transport device (100), in particular a buggy (102), having at least three wheels (120, 122, 124) and a handle (112) for a user, wherein at least one wheel (120, 122, 124) is designed as a drive wheel (130, 132) with an associated electric drive unit (140, 142) in order to be able to carry out an at least partially electric support of the transport device (100) in an operating state for a manual pushing or pulling operation by the user, and wherein a locking device (150) having at least one locking element (350) is assigned to the at least one drive wheel (130, 132), wherein the at least one locking element (350) is designed to prevent at least one drive wheel (130, 132) from rotating in the locked state, characterized in that at least two activation devices (366 ) are assigned to the locking device (150), 367) Wherein a first activation means (366) is configured for automatically, electromagnetically activating the locking means (150), and wherein a second activation means (367) is configured for manually activating the locking means (150) by a user.

2. Transport device as claimed in claim 1, characterized in that the associated electric drive unit (140, 142) is arranged in a housing (239), wherein the housing (239) has a first housing part (237) which is non-rotating and arranged on the transport device (100) and a second housing part (236) which is connected to the first housing part (237) in a rotationally movable manner, wherein the locking device (150) is assigned to the first housing part (237), and wherein the at least one locking element (350) is designed to prevent the second housing part (236) from rotating in the locked state.

3. Transport device as claimed in claim 2, characterized in that the at least one locking element (350) can be at least partially form-fittingly engaged with an engagement geometry (313) provided on the second housing part (236) in the locked state, and in that the engagement geometry (313) is configured in the manner of a hole circle.

4. Transport device as claimed in any of the foregoing claims, characterized in that a turntable (360) is provided, wherein the at least one locking element (350) can be moved axially into the locked state or into the released state by rotation of the turntable (360).

5. Transport device according to claim 4, characterized in that the turntable (360) has a bevel (361) on its end facing at least one locking element (350), wherein the at least one locking element (350) moves axially along the bevel when the turntable (360) rotates.

6. Transport device as claimed in claim 4 or 5, characterized in that the first activation means (366) have, for the automatic activation of the locking means (150), an energized cylinder magnet (368) which can be controlled by a control means (160), wherein the cylinder magnet is configured for rotating the turntable (360).

7. Transport device as claimed in claim 4 or 5, characterized in that the second activation device (367) has a pedal unit (250) with a manually operable pedal (251) and a swivel shaft (355), wherein the swivel shaft (355) is rotationally connected with the pedal (251) and the turntable (360).

8. Transport device as claimed in claim 7, characterized in that the swivel axis (355) is connected at its free end (301) to a swivel lever (385) which is arranged in the radial direction (303) of the swivel axis (355) relative to the swivel axis (355), wherein the swivel plate (360) has a receptacle (362) at its end facing the pedal (251), and wherein the swivel lever (385) is arranged at least in sections in the receptacle (362) for twisting the swivel plate (360).

9. Transport device according to claim 7 or 8, characterized in that a shaft receiving part (382) is provided, which has an inner receiving part (386) for arranging the swing shaft (355) and the free end (301) of the swing lever (385).

10. A transportation device according to claim 9, characterized in that the turntable (360) is arranged on the outer circumference (387) of the shaft receiving part (382).

11. Transport device as claimed in one of claims 7 to 10, characterized in that the second activation device (367) is configured for a user-initiated changeover of the at least one locking element (350) from the released state into the locked state by a user-initiated changeover of the pedal (251) into the locked position.

12. Transport device as claimed in one of the preceding claims, characterized in that the switching from the locked state into the released state can only be performed by actuation of the second activation device (367), in particular by a user switching a pedal (251) assigned to the second activation device (367) into the released position.

13. Transport device as claimed in any of the foregoing claims, characterized in that a shaft unit (230) with two drive wheels (130, 132) is provided, which drive wheels are connected to one another by a shaft (260), wherein the at least one swivel shaft (355) is arranged inside the shaft (260), and wherein both drive wheels (130, 132) can be simultaneously locked by means of the at least one swivel shaft (355) when the locking device (150) is activated.