WO2020001829A1

WO2020001829A1 - Transport device, in particular stroller, comprising an electric drive unit

Info

Publication number: WO2020001829A1
Application number: PCT/EP2019/060836
Authority: WO
Inventors: Katja Strobel; Sebastian Helfrich; Ester RUPRECHT; Norbert Martin; Uwe Hammer; Barbara JUENGLING
Original assignee: Robert Bosch Gmbh
Priority date: 2018-06-27
Filing date: 2019-04-27
Publication date: 2020-01-02
Also published as: EP3814195A1; CN112292304A; DE102018210448A1

Abstract

The invention relates to a transport device (100), in particular a stroller (102), comprising at least three wheels (120, 122, 124) for moving on an underlying surface (116) and a handle (112) for a user. At least one wheel (120, 122, 124) is designed as a drive wheel (130, 132) which can be driven electromotively by means of a paired electric drive unit (140, 142) in order to allow an at least partially electromotive support of a manual pushing or pulling operation of the transport device (100) by means of the user in an operating state. The drive wheel (130, 132) has an at least electromagnetically acting locking device (150, 152, 300, 430, 510, 610, 720, 800) which is designed to automatically block the drive wheel (130, 132) in order to quickly switch from the operating state to a blocking state in the event of a malfunction, in particular in the absence of the user or an at least partial failure of the power supply (144).

Description

description

title

Transport device, in particular a pram, with an electric drive unit

State of the art

The present invention relates to a transport device, in particular a pram, with at least three wheels for movement on a surface and a handle for a user, at least one wheel being designed as a drive wheel which can be driven by an electric motor by means of an associated electric drive unit in order to to enable an operating state at least partially electromotive support of a manual pushing or pulling operation of the transport device by the user.

A transport device designed as a stroller is known from the prior art, which has an electric drive for active electromotive pushing or pulling support of a user. Such a stroller has at least three wheels and a handle for a 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.

Mechanical parking brakes or brakes which can be actuated by means of a foot pedal or a footrest are known on conventional transport devices without an electromotive-assisted pushing or pulling operation and corresponding pushchairs, in order to prevent the uncontrolled rolling away of, for example, loading or unloading processes, or transports parked on inclined surfaces. port device to prevent.

Disclosure of the invention The present invention provides a transport device, in particular a stroller, with at least three wheels for movement on a surface and a handle for a user, at least one wheel being designed as a drive wheel which can be driven by an electric motor by means of an associated electric drive unit in order to enable at least partial electromotive support of a manual pushing or pulling operation of the transport device by the user in an operating state. The drive wheel has an at least electromagnetically acting locking device, which is designed to automatically block the drive wheel in the event of a fault, in particular when the user is absent or an at least partial failure of a power supply, for rapid change from the operating state to a blocking state.

The invention thus makes it possible to provide a transport device in which there is a high level of operational safety, in particular with respect to uncontrolled travel movements of the transport device in the event of a fault. The locking device thus functions in addition to an obligatory, purely mechanical parking brake of the transport device, which can be actuated by means of a footrest or a foot pedal, as an additional, electrical "brake" or safety device in order to, in the event of a fault, e.g. to prevent an uncontrolled movement of the electromotive-supported transport device or the stroller in the absence of a user, a low state of charge of an accumulator necessary for operation, any software errors, etc.

The drive wheel preferably has a rotor carrier with a rim for a tire, the rotor carrier and the rim being formed in one part or two parts. As a result, standard tires can be used for the transport device. In the case of the one-piece variant, the rotor carrier and the rim are permanently connected to one another or are made in one piece. With the two-part variant, a particularly simple change of a tire mounted on the rim is possible.

In the case of a technically advantageous further development, the locking device has a current-carrying cylinder magnet with a plunger and a blocking member, the blocking member being designed to prevent the rotor carrier from rotating in the blocked state. The locking device can thus be cost-optimal can be realized with industry standard cylindrical magnets.

According to one embodiment, the blocking member has a blocking section which, in the blocked state, can be at least partially positively engaged with an engagement geometry on the rotor carrier, the engagement geometry being designed in the manner of a toothing, a detent and / or a recess. A robust construction of the locking device with a mechanically reliable blockage of the drive wheel can thus be made possible.

The blocking member is preferably designed as a bolt and arranged coaxially or parallel to an axis of the rotor carrier. The locking device can thus be easily adapted to different installation requirements.

In one configuration, the blocking element is assigned a spring element which is designed to pretension the blocking element in the blocking state. As a result, comparatively low electromagnetic actuation forces have to be exerted by the cylinder magnet.

In the case of an embodiment, the blocking member has an annular groove, with a locking element being arranged in the annular groove or the plunger of the cylinder magnet being arranged in the annular groove in order to arrange the blocking member in the operating state. An electromagnetically actuable lock of the blocking member can thus be implemented in a simple and uncomplicated manner.

The cylinder magnet is preferably arranged in the axial or radial direction of the blocking member. Different installation variants can thus be provided for the cylinder magnet.

In the de-energized state of the cylinder magnet, the plunger preferably retracts automatically at least partially into a housing of the cylinder magnet or slides out of the housing. This results in a variety of design options with regard to the electromagnetic triggering of the locking device. The locking device preferably has a display device for optically signaling the blocking state and the operating state. This provides clear visual information to the user about the current operating status of the stroller or the transport device.

A change from the locked state into the operating state is preferably possible only through mechanical intervention by the user. As a result, an automatic, uncontrolled resumption of the operating state by the transport device can be at least approximately prevented.

In a further embodiment, the locking device interacts with a mechanical parking brake in such a way that the change from the locked state to the operating state is carried out independently of the locking device by the user actuating a footrest assigned to the parking brake. This enables a combination with a conventional parking brake of the transport device that operates purely mechanically and can be actuated by means of a footrest or a foot pedal.

The blocking state is preferably reset to the operating state exclusively by mechanical actuation on the user side of the display device of the blocking member or the footrest of the parking brake. As a result, an additional actuating element for resetting the blocking state into the operating state can initially be omitted. At the same time, the display device, which preferably moves mechanically to indicate the blocked state and the operating state between two layers, signals to the user in an intuitively clearly perceptible manner how the blocking state of the transport device has to be reset.

The locking device is preferably assigned a control device which is designed to electronically control the cylinder magnet. As a result, complex control and / or regulation processes can be implemented. The footrest of the parking brake always blocks the transport device mechanically. If, for example, the user fails to activate the footrest of the parking brake, this can be registered by the control device and the cylinder magnet of the locking device can be activated, so that unintentional unloading of the Power supply to the transport device is prevented by constant activation of the drive wheels (so-called “smart wheels”) driven by the electric drive units to maintain a constant position of the transport device.

In the case of a further embodiment, the at least one drive wheel has an axle holder and the locking device is assigned a turntable with a slope, the turntable being rotatable in relation to the axle holder and wherein rotation of the turntable axially into the blocking member along the slope Blocked state or the operating state moves. This enables a robust and user-friendly actuation of the locking device.

Brief description of the drawings

The invention is explained in more detail in the following description with reference to exemplary embodiments shown in the drawings. Show it:

1 is a schematic side view of an exemplary transport device designed as a stroller,

FIG. 2 shows an enlarged cross section of the drive wheel of the stroller of FIG. 1, which can be driven by an electric motor by means of an electric drive unit, FIG.

3 is an enlarged view of section III of FIG. 2 with an embodiment of the locking device,

4 shows the locking device from FIG. 3 in the locked state,

5 shows a cross-sectional representation of a lower form of the embodiment from FIG. 2 of the locking device in the operating state,

6 shows a cross-sectional illustration of a further embodiment of the locking device in the normal operating state,

6a the locking device of Fig. 6 in the locked state,

6b is a perspective view of the locking device of FIG. 6a in the blocking state,

7 shows a cross-sectional representation of an alternative embodiment of a locking device in the normal operating state, 7 a shows a cross-sectional view of the locking device from FIG. 7 in the blocking state,

8 shows a cross-sectional illustration of a further embodiment of a locking device in the normal operating state,

8a the locking device of Fig. 8 in the locked state,

9 is a perspective view of an engagement geometry of the locking device of FIGS. 8 and 8a,

10 shows a cross-sectional illustration of a fifth embodiment of a locking device with a foot-operated parking brake in the normal operating state,

11 is a perspective view of the drive wheel with the locking device of FIG. 10 in the normal operating state,

12 is a cross-sectional view of the locking device of FIG. 10 in the blocking state,

13 is a perspective view of the drive wheel with the locking device of FIG. 12,

14 is an exploded perspective view of a further embodiment of a locking device with a foot-operated parking brake in the normal operating state,

14a is an enlarged perspective detail view of the locking device of FIG. 14,

14b is a perspective view of the locking device of FIG. 14,

14c is a partial perspective sectional view of the locking device of FIG. 14 in the normal operating state, and

14d is a partial perspective sectional view of the locking device of FIG. 14 in the locked state.

Description of the embodiments

1 shows a transport device 100, which is designed as a stroller by way of example and is also referred to below as "stroller 102". The stroller 102 preferably has at least three wheels 120, 122,

124 for movement on a surface 1 16. The preferably three wheels 120, 122, 124 are rotatably arranged on a chassis 106, which has a handle 112 for a user, not shown. The wheel 122 lying in front of the drawing plane hides the one behind the drawing plane. sensitive wheel 124, the wheels 122, 124 being arranged axially offset along a common axis 110.

At least one of the preferably three wheels 120, 122, 124 is preferably designed as a drive wheel 130, 132 and can be driven for this purpose by means of an electric drive unit 140, 142. The two rear wheels 122, 124 are preferably designed as drive wheels 130, 132 and can preferably be driven independently of one another by means of an electric drive unit 140, 142 in each case. With the help of the two drive wheels 122, 124, in an operating state of the stroller 102, at least partial electromotive support of a manual pushing or pulling operation by the user is possible, the pushchair 102 essentially being in relation to a pushing or pulling direction 114 moved to the underground 116. An operating state in the context of the present invention is understood to mean a standstill of the stroller 102 and / or a driving state. This can result in a standstill on a flat surface and / or an inclined plane or slope.

In order to regulate the electric drive units 140, 142, which are preferably implemented with gearless and permanently excited DC motors, the stroller 102 preferably also has an electronic control and / or regulating device 160. At least one, preferably each of the two, for example, active here Drive wheels 130, 132 supported by an electric motor, for safety reasons, have a locking device 150, 152 according to the invention. By means of the locking device 150, 152, the drive wheels 130, 132 are activated in the event of a fault - in particular when the user is absent or an at least partial failure occurs Central electrical power supply 144 of the stroller 102 - for a quick change from the normal operating state with active electromotive pushing or pulling support into the blocking state automatically and independently blocked.

FIG. 2 shows the drive wheel 130 of the stroller 102 from FIG. 1, which among other things has a rotor carrier 200 with a rim 202 for a tire 204. The rim 202 and the rotor carrier 200 are preferably formed in one piece. On the rotor carrier 200 there is preferably a plurality of circumferentially evenly spaced and radially inwardly directed persons. fixed magnet 206. The rotor carrier 200 preferably forms, together with a stator carrier 210 fastened to an axle pin 208, the electrical drive unit 140 of the one drive wheel 130 of the stroller. The stator carrier 210 preferably has a multiplicity of electrical windings 212 and is connected in a rotationally fixed manner to the chassis 106 of the stroller 100, while the rotor carrier 200 is rotatably fastened on the axle 208 by means of a bearing 214.

The drive wheel 130 has an embodiment of the locking device 150, which is shown in a section III and, for example, is integrated coaxially in the axle journal 208. The locking device 150 can preferably be controlled by means of an electronic control device 220, which is designed here as a separate component. Alternatively, the control device 220 can also be designed as a functional component of the central control and / or regulating device 160 of the stroller 102.

FIG. 3 shows section III from FIG. 2 with the locking device 150, which has, inter alia, a cylinder magnet 228 with a housing 230 in which a plunger 232 for the axial electromagnetic actuation of a blocking member 234 is received. The rotor carrier 200 is rotatably fastened to the axle pin 208 of the chassis 106 of the stroller 102 by means of the bearing 214. The rotor carrier 200 and the axle journal 208 have a common axis 236.

The blocking member 234 is realized here only by way of example with a bolt 238 which is positioned coaxially in the journal 208 and is axially displaceable, but non-rotatably, therein. The blocking member 234 preferably has a blocking section 242 which is formed, for example, with an (external) toothing 244. The rotor carrier 200 has an engagement geometry 246 which is complementary to the blocking section 242 and is designed here as an example of an (inner) toothing 248.

In addition, an annular groove 250 is inserted into the bolt 238, in which, in the operating state shown here, preferably engage three locking elements which are resiliently radially inward, preloaded and circumferentially evenly spaced from one another, of which only one locking element 252 is shown here. The block The locking member 234 is also preferably biased in the axially outward direction or in the direction of the rotor carrier 200 by means of a spring element 254, but is preferably fixed in the axial position shown in the axial position shown by the latching elements 252 engaging in the annular groove 250 when the cylinder magnet 228 is not energized. The bolt 238 also passes through a stepped bore 258 of the rotor carrier 200 and preferably carries an optical display device 260 with a cylinder 262. An axially outer termination of the cylinder 262 is preferably formed by a circular stop plate 264 which is located on an outer side 266 of the rotor carrier 200 rests, while the cylinder 262 is preferably flush in an unsigned, larger diameter section 268 of the stepped bore 256. In the normal operating state of the pushchair 102 illustrated here, the toothing 244 of the bolt 238 and the toothing 248 of the rotor support 200 are preferably out of engagement, so that the rotor support 200 can rotate freely in relation to the axle pin 208 and the pushchair is in the normal position Operating state. This status is signaled to the user at the same time by means of the display device 260 by the covered cylinder 262 of the blocking member 234.

By preferably energizing the cylinder magnet 228 at least for a short time, the latching element 252 and the further latching elements are released from the annular groove 250 and the plunger 232 of the cylinder magnet 228 preferably pushes the pin 238 outward until the toothing 244 of the pin 238 is at least partially positive engages in the toothing 248 of the rotor carrier 200 (cf. in particular FIG. 4) and the drive wheel 130 attached to it is secured against any rotational movement in relation to the axle journal 208. At the same time, the cylinder 262 of the display device 260 is preferably pushed axially out of the stepped bore 258 of the rotor carrier 200, as a result of which the locked state is displayed to the user. In the de-energized state, an internal spring (not shown) preferably pulls the plunger 232 back into the housing 230 of the cylinder magnet 228 at least in sections. Due to the effect of the spring element 254, which is preferably designed as a compression spring, the blocking state is permanently maintained until it is released, preferably by mechanical user intervention.

FIG. 4 shows the locking device 150 from FIG. 3 in the locked state, the toothing 244 of the pin 238 received coaxially in the axle pin 208 engages positively in the toothing 248 of the rotor carrier 200 at least in regions. The cylinder 262 of the display device 260 indicates the blocking state of the stroller 102. The plunger 232 of the cylinder magnet 228, which is not energized in this case, is partially retracted into the housing 230. In this case, the blocking state is permanently maintained without external mechanical user intervention, preferably through the action of the spring element 254. In order to release the blocking state, it is preferably necessary for the user to move the blocking member 234 in the axial direction, as indicated by the arrow 270 pushes against the force of the spring element 254 into the axle journal 208 until the latching element 252 and all other latching elements can snap back into the annular groove 250 and the locking device 150 changes to the normal operating state of FIG. 3. The normal operating state is preferably maintained permanently until the cylinder magnet 228 is energized again.

5 shows a further embodiment 300 of the locking device 150, in which a rotor carrier 302 of the first drive wheel 130 of the pushchair 102 is formed in two parts or in two parts. The rotor carrier 302 is preferably constructed in two parts or in two parts with a winding-carrying inner part 304 and a rim-carrying outer part 306 connected to this, but if necessary removable again, for a tire of the drive wheel 130 of the stroller 102. As a result, e.g. a tire of the drive wheel 130 can be changed in a simple manner.

Otherwise, the structural design of the locking device 300 corresponds to the pin 238, which is received coaxially and axially displaceably in the axle pin 208 and can be axially displaced by means of the cylinder magnet 228, the toothing 244 of which, in turn, activates the blocking state with an inner toothing 308 complementary to this in the outer part 306 of the rotor carrier 302 can be brought into engagement, exactly the embodiment of the locking device 150 from FIGS. 2 to 4, so that for the sake of brevity and conciseness of the description, reference is made to the explanations of FIGS. 2 to 4 be.

FIG. 6 shows a cross-sectional illustration of an alternative embodiment 430 of the locking device 150 in the normal operating state. In an axle holder 400 of the chassis 106 of the stroller 102 there is preferably a thru axle 402 rotated test recorded, which has an axis 404. A rotor carrier 410 of the drive wheel 130 of the stroller 102 is preferably equipped with a plurality of radially inwardly directed permanent magnets 414 as part of an electric drive unit 416 of the drive wheel 130. The rotor carrier 410 is connected to a rim 418 for a tire (not shown), this connection being detachable if necessary.

The rotor carrier 410 and the rim 418 are preferably rotatably supported by means of a bearing 420 both on the axle holder 400 and on the thru axle 402 of the chassis 106. A plurality of electrical windings 424 are preferably arranged on a stator carrier 422 of the axle holder 400 and, together with the permanent magnets 414 of the rotor carrier 410, form the electrical drive unit 416 of the drive wheel 130 of the stroller 102. The drive wheel 130 and the electric drive unit 416 are illustratively constructed rotationally symmetrically to the axis 404.

The locking device 430 comprises the cylinder magnet 228 with the housing 230, as well as a blocking member 432, which is preferably formed at least essentially with a bolt 434, which is received in an axially displaceable manner in a holder 436. In contrast to the embodiment from FIGS. 2 to 4 and the associated sub-shape from FIG. 5, the blocking member 432 preferably runs parallel to the axis 404 and the plunger 232 of the cylinder magnet 228 is preferably oriented perpendicular to the axis 404 , As a further difference, in this embodiment the energized cylinder magnet 228 at least partially pulls the plunger 232 into the housing 230, while a spring inside the housing pushes the plunger 232 out of the housing 230 of the cylinder magnet 228 again when the current is off.

The bolt 434 preferably has an approximately centrally inserted annular groove 438, in which the plunger 232 of the cylinder magnet 228 engages here in a spring-loaded manner radially inwards. An engagement geometry 440 of the rotor carrier 410 is preferably implemented in the manner of a catch 444 with a plurality of recesses, which are exemplarily cylindrical and are circumferentially evenly spaced from one another, of which only one recess 442 is visible here. The recesses are only exemplary here as cylindrical (bag ) Drilled holes, but can also have any other shape, such as an angular shape.

On a free end of the bolt 434 facing the rotor carrier 410, a blocking section 446 is preferably provided, which is formed, for example, with a cylinder section 448 rounded at the end on the hemispherical side. A circular plate 450 is preferably arranged at one end of the bolt 434 which is directed away from the cylinder section 448. The bolt 434 is also axially biased in the direction of the rotor carrier 410 by means of a spring element 452, which is supported between a housing 454 of the locking device 430 and a securing ring 456 fastened on the bolt 434.

In addition, the locking device 430 preferably has a mechanical-optical display device 458 with a rocker arm 460 pivotably mounted in the housing 454, the illustratively long lever arm of which preferably rests on the plate 450 and the shorter lever arm of one in the housing 454 axially displaceably accommodated step cylinder 462. In the state illustrated in FIG. 6, the locking device 430 is in the normal operating state, since the bolt 434 is in the axially most retracted position and the blocking section 446 is not in engagement with the engaging geometry 440 of the rotor carrier 410 releases. As a result, the rotor carrier 410 and the rim 418 of the drive wheel 130 connected to it can rotate freely in relation to the axle holder 400. In this state, the bolt 434 is preferably held securely against the force of the spring element 452 by the plunger 232 of the cylinder magnet 228 which is switched off when it engages in the annular groove 438. At the same time, the plate 450 of the bolt 434 preferably retracts, with the aid of the rocker arm 460, an unspecified, suitably marked section 464 of the stepped cylinder 462 into the housing 454 of the locking device 430, thereby giving the user the status of the normal operating condition. status is clearly displayed visually.

FIG. 6a shows the locking device 430 of FIG. 6 in the locked state, which can preferably be achieved by briefly energizing the cylinder magnet 228. As a result, the plunger 232 at least partially retracts into the housing 230 of the cylinder magnet 228. This causes the plunger 232 and the Annular groove 438 of the bolt 434 is disengaged, so that the spring element 452 can insert the blocking section 446, which is partially implemented as a cylinder section 648, into the bore-like recess 442 of the engagement geometry 440, creating an at least regionally positive connection. As a result, preferably any rotary movement between the rotor carrier 410 of the drive wheel 130 and the axle holder 400 of the chassis 106 of the stroller 102 is reliably prevented. At the same time, the plate 450 of the bolt 434 preferably pushes the stepped cylinder 462 of the display device 458 out of the housing 454 of the locking device 430 by means of the rocker arm 460, so that the larger-diameter section 464 of the stepped cylinder 462 is visible to the user and indicates the locked state.

After preferably five seconds, the cylinder magnet 228 is e.g. by means of the central control and / or regulating device of the stroller 102 (cf. FIG. 1; reference number 160) or the decentralized control device of the locking device 430 (cf. FIG. 2, reference number 220), preferably switched off automatically, whereby the plunger 232 due to the 6 and the plunger 232 rests against the bolt 434 in a resiliently preloaded manner radially inwards. Subsequently, the larger-diameter section 464 of the stepped cylinder 462 of the display device 458 can preferably be pressed into the housing 454 by user intervention until it is flush with the outside of the housing 454 and is thereby covered. In this process, the bolt 434 is preferably axially displaced by means of the rocker arm 460 under the plate 450 until the cylinder section 446 of the bolt 434 and the recess 442 of the engagement geometry 440 disengage and the plunger 232 of the cylinder magnet 228 again in the annular groove 438 of the bolt 434 can snap into place. The plunger 232 of the cylinder magnet 228 permanently fixes the bolt 434 in the normal operating state of the stroller 102 against the spring force of the spring element 452 in the axial position of FIG. 6.

Fig. 6b shows the locking device 430 of Fig. 6a in the locked state. The locking device 430 is preferably arranged in the region of the chassis 106 of the stroller 102. The blocking state is preferably determined by the locking device consisting of a circular housing cover 470 of the housing 454. 430 outstanding, larger diameter section 464 of the stepped cylinder 462 optically-mechanically displayed for the user in a clear manner.

FIG. 7 shows a further embodiment 510 of the locking device 150 in the normal operating state. A rotor bracket 502 with a rim 504 for a tire (not shown) is preferably rotatably fastened to an axle holder 500 of the chassis 106 of the stroller 102 by means of a bearing 506. The locking device 510 preferably includes, among other things, a blocking member 512, which is formed here with a bolt 514, which is received in the axle holder 500 and a holder 516 attached to it in an axially displaceable manner. The bolt 514 preferably has an annular groove 518, in which, analogously to the embodiment in FIG. 6, the plunger 232 of the non-energized cylinder magnet 228 engages in a radially inward manner. In the de-energized state of the cylinder magnet 228, the plunger 232 is preferably at least partially pushed out of the housing 230 of the cylinder magnet 228 by means of an internal spring, while the plunger 232 is at least partially pulled back into the housing 230 by energizing the cylinder magnet 228 and the annular groove 518 releases. The spatial arrangement of blocking member 512 and cylinder magnet 228 as well as the design of axle holder 500 and rotor carrier 502 essentially corresponds to the embodiment in FIG. 6.

The rotor carrier 502 preferably has an engagement geometry 520 with a large number of recesses which are designed in the manner of a catch 524, only one recess 522 being visible from the recesses here, which is designed, for example, in the manner of a cylindrical (blind) bore. The bolt 514 preferably has a blocking section 526 at its free end, which is realized with a cylinder section 528 that is rounded at the end in a hemispherical manner. A circular plate 530 is preferably provided at one end of the bolt 514 facing away from the cylinder section 528. The bolt 514 is guided through a through bore 532 of a housing 534 of the locking device 510 and is preferably axially biased in the direction of the rotor carrier 502 by means of a spring element 536, which is supported between the housing 534 and a securing ring 538 fastened on the bolt 514. In addition, a mechanical-optical display device 548 is preferably provided, which is formed with a hollow cylindrical sleeve 540, which surrounds the bolt 514 in sections, with a viewing window 542 and with two markings 544, 546 of the bolt 514, for example with different colors. The marking 544 is, for example, green and stands for the normal operating state, while the marking 546 is, for example, red and stands for the blocking state of the stroller 102. The sleeve 540 is preferably attached to the housing 534 outside of the through-hole 532 or represents an axial continuation of the through-hole 532 of the housing 534 and at the same time an axial end stop for the plate 530.

In the normal operating state of the locking device 510 shown in FIG. 7, the cylinder section 528 of the bolt 514 and the engaging geometry 520 or the bore-shaped recess 522 of the rotor carrier 502 are preferably out of engagement, so that the rotor carrier 502 can freely rotate together with the rim 504 in relation to the axle holder 500. The axial position of the bolt 514 is permanently fixed even when the cylinder magnet 228 is not energized, preferably by the plunger 232 engaging in the annular groove 518. The two markings 544, 546 of the bolt 514 are preferably attached axially such that the marking 544 is visible to the user within the viewing window 542 of the sleeve 540 in the normal operating state. To activate the blocking state (cf. FIG. 7a), preferably only a brief energization of the cylinder magnet 228 is required, as a result of which the plunger 232 partially retracts into the housing 230 and the annular groove 518 for axially displacing the bolt 514 in the direction of the rotor carrier 502 releases due to the preloaded spring element 536. As a result, the cylinder section 528 of the bolt 514 is pushed into the engaging geometry 520 of the rotor carrier 502 due to the force of the spring element 536, creating an at least regionally positive connection. At the same time, the marking 546 provided on the bolt 514 preferably shifts into the area of the viewing window 542 of the display device 548 to display the blocking state which has then been reached.

Fig. 7a shows the locking device 510 of Fig. 7 in the locked state, in which the spring element 536 preferably the hemispherical cylinder section 528 of the locking member 512 designed as a bolt 514 into the bore-like Recess 522 of the engaging geometry 520 in the rotor carrier 502 presses, so that it can no longer rotate in relation to the axle holder 500 of the chassis 106 of the stroller 102. The cylinder magnet 228 is in the energized state here, so that the tappet 232 is preferably at least partially withdrawn into the housing 230 and the annular groove 518 of the bolt 514 is released. The marking 546 is preferably located within the viewing window 542 of the sleeve 540, so that the blocking state is clearly signaled.

If the cylinder magnet 228 is discharged, the plunger 232 preferably moves radially spring-loaded up to the bolt 514 and initially comes to rest against the bolt 514 outside the annular groove 518. In this stage, the bolt 514 is preferably still held by the spring element 536 , which is supported between the locking ring 538 and the housing 534 of the locking device 510. By axially pulling out the bolt 514 counter to the force of the spring element 536 by grasping the plate 530 on the user side, the bolt 514 - as indicated by the arrow 550 - is preferably pulled axially out of the recess 522 of the rotor carrier 502 to such an extent that the radially inwardly spring-loaded plunger 232 can preferably engage in the groove 518 and the normal operating state of the locking device 510 is reached again. This is signaled by the marker 544 then located within the viewing window 542 of the sleeve 514.

In the locked state, the sleeve 540 preferably also forms an axial end stop for the plate 530. A shoulder 552 of a stepped bore 554 for the passage of the bolt 514 through the holder 516 constitutes an end stop for the locking ring 538 Spring element 536 and the locking ring 538 are arranged within the larger diameter section of the stepped bore 554, which is also not shown for reasons of better drawing clarity.

8 shows a further embodiment 610 of the locking device 150 in the normal operating state. A rotor support 602 with a rim 604 for is preferably on an axle holder 600 of the chassis 106 of the stroller 102 a tire, not shown, rotatably mounted by means of a bearing 606. The locking device 610 preferably comprises a blocking member 612, which is formed here with a bolt 614, which is axially displaceably received in a section 616 of larger diameter, which is not shown in the drawing for the sake of clarity, in a holder 618 fastened to the axle holder 600 is. Analogous to the embodiments of the locking devices of FIGS. 6 and 7, an annular groove 620 is embedded in the bolt 614, into which the plunger 232 of the de-energized cylinder magnet 228 can engage in a radially inward manner.

When the cylinder magnet 228 is de-energized, the plunger 232 is preferably at least partially pushed out of the housing 230 automatically, while the plunger 232 is preferably at least partially pulled back into the housing 230 by energizing the cylinder magnet 228 and the annular groove 620 of the bolt 614 releases. The spatial arrangement of the blocking member 612 and the cylinder magnet 228 as well as the design of the axle holder 600 and the rotor support 602 essentially again correspond to the embodiments of the locking device of FIGS. 6 and 7.

The rotor carrier 602 preferably has an engagement geometry 626 which is formed with an annular groove 628 which is open radially inwards and with a disk 630. The disk 630 is preferably connected in a rotationally fixed manner to the rotor carrier 602 and has a plurality of circularly arcuate recesses 632 radially inwards, which are formed approximately on the circumference in the manner of a circularly unwound cycloid. The bolt 614 preferably has a blocking section 636 at its free end, which is realized with a disk-like or stamp-like thickened cylinder section 638. An (outer diameter D of the cylinder section 638 is preferably significantly larger than an (outer) diameter d of a shaft 640 of the bolt 614 and an axial length h or height of the cylinder section 638 is small compared to its diameter D. The cylinder section 638 is preferably can be introduced at least partially in a form-fitting manner into one of the circular-arc-shaped recesses 632 of the disk 630.

At one end of the bolt 614 facing away from the cylinder section 638 there is preferably a mechanical-optical display device 646 in the form of a It is provided here, for example, in the form of a bandage, for example colored marking 648. The shaft 640 of the bolt 614 is preferably axially displaceably guided in the section of the stepped bore 616 of the holder 618, which portion is smaller and not designated. The bolt 614 is preferably biased away from the rotor carrier 602 by means of a spring element 650, which is supported between a shoulder 652 of the stepped bore 616 and a securing ring 654 fastened on the shaft 640 of the bolt 614. The display device 646 preferably penetrates a bore 656 of a housing 660 of the locking device 610 to ensure visibility for the user.

In the normal operating state shown here, the blocking section 636 or the cylinder section 638 of the bolt 614 is preferably only in the region of the annular groove 628 of the rotor carrier 602, so that the latter can rotate freely with respect to the axle holder 600. The bolt 614 is held reliably in the axial position shown here by the plunger 232 which engages in the annular groove 620 when the cylinder magnet 228 is de-energized. To activate the blocking state of the locking device 610, an at least brief energization of the cylinder magnet 228 is preferably sufficient. As a result, the tappet 232 and the annular groove 620 preferably disengage, so that the bolt 614 is pulled out of the cylinder section 638 of the annular groove 628 in the rotor carrier 602 by means of the axially prestressed spring element 650 and is inserted into one of the cycloidal recesses 632 within the disk 630 of the engagement geometry 626 , whereby any rotational movement between the rotor carrier 602 and the axle holder 600 is blocked (cf. in particular FIG. 8a).

FIG. 8a shows the locking device 610 from FIG. 8 in the locked state, in which the plunger 232 of the cylinder magnet 228 and the annular groove 620 of the bolt 614 are out of engagement, since the plunger 232 of the cylinder magnet 228 at least partially counteracts its housing 230 the force of an internal spring is withdrawn. Because of this, the spring element 650, which is supported and axially preloaded between the shoulder 652 of the stepped bore 616 of the holder 618 and the securing ring 654, preferably pulls the blocking section 636 or the cylinder section 638 of the bolt 614 out of the annular groove 628 in the rotor carrier 602 and moves the cylinder section 638 into the recess 632 of the engaging geometry 626 of the disk 630 of the rotor support gers 602. As a result, a rotary movement of the rotor carrier 602 in relation to the axle holder 600 is prevented and the locking state of the locking device 610 is given. This status is signali by the axially protruding from the housing 660 display device 646 with the marking 648. The blocking state is maintained even when the cylinder magnet 228 is de-energized due to the force effect of the spring element 650, the plunger 232 coming into contact with the shaft 640 of the bolt 614 outside the annular groove 628 in a spring-loaded manner.

Solely by pushing the button-like, optical display device 646 against the force of the partially relaxed spring element 650, the plunger 232 can be locked again with the annular groove 620 of the bolt end 614 when the cylinder magnet 228 is de-energized and the operating state can be reactivated. At the same time, the cylinder section 638 of the bolt 614 is disengaged from the recess 632 of the disk 630 and axially displaced in the direction of the rotor support 602 until the cylinder section 638 is positioned in the region of the annular groove 628 of the rotor support 602 and the locking device 610 is set to the normal operating state in which the rotor carrier 602 can rotate freely in relation to the axle holder 600. By pushing the bolt 614 into the housing 660 of the locking device 610, the end marking 648 of the display device 646 of the bolt 614 preferably disappears inside the housing 660 or is flush with the outside thereof, as a result of which the activation of the normal Operating state of the locking device 610 of the stroller 102 is displayed mechanically and optically.

FIG. 9 shows an engagement geometry of the locking device 610 from FIGS. 8 and 8a in the released or normal operating state. The engaging geometry 626 of the rotor carrier 602 comprises the annular groove 628 and the axially adjoining, preferably solid disk 630 with the approximately circular arc-shaped recesses 632 formed thereon in the manner of cycloids 662. The disk 630 is exemplified here by means of a groove -Spring connection 664 at least rotatably connected to the rotor carrier 602. The cylinder section 638 of the bolt 614 acting as a blocking member 612 is not in engagement with one of the circular-arc-shaped recesses 632 of the disk 630 and is located axially in the region of the annular groove 628 of the disk 630 of the rotor support 620, so that the normal operating state is active.

10 shows an alternative embodiment 720 of the locking device 150 with a foot-operated parking brake in the normal operating state. An axle 702, which has an axis 704, is preferably non-rotatably received in an axle holder 700. A rotor carrier 710 is preferably releasably connected to a rim 712 for mounting a tire, not shown, if necessary. The rotor carrier 710 and the rim 712 are preferably rotatably supported by means of a bearing 714 both on the axle holder 700 and on the quick-release axle 702. Electrical windings 718 are preferably arranged on a stator carrier 716 of the axle holder 700. The drive wheel (not shown here) with the rim 712 (cf. in particular FIG. 11; reference number 130), the rotor support 710 and the plug-in axle 702 are each illustratively rotationally symmetrical to the axle 704.

The locking device 720 of the stroller 102 in turn preferably comprises essentially the cylinder magnet 228 with the housing 230 and a blocking member 724, which is preferably formed with an essentially cylindrical bolt 726, which is axially displaceably received in a through hole 728 of the stator carrier 716 is. The energized cylinder magnet 228 preferably pulls the plunger 232 at least partially into the housing 230, while the plunger 232 automatically moves out of the housing 230 again when the cylinder magnet 230 is de-energized. The bolt 726 preferably has a blocking section 730 at a free end, which is realized here only as an example with a cylinder section 732 rounded at the end in a hemispherical manner. The bolt 726 is preferably axially pointing away from the rotor carrier 710 by means of a spring element 734, which is supported between a securing ring 736 fastened to the bolt 726 and an edge zone of the through bore 728 of the stator carrier 716.

A plate-like, circular head 738 is preferably formed on one end of the bolt 726 facing away from the cylinder section 732. The bolt 726 is illustratively further guided through a through (housing) bore 740 of a housing 742 of the locking device 720 located axially between the locking ring 736 and the head 738. The block designed as bolt 726 The coupling member 724 and the cylinder magnet 228 are each arranged parallel to and spaced from the axis 704 or eccentrically to the latter. An engaging geometry 744 of the rotor carrier 710 is preferably implemented in the manner of a catch 748 or in a grid-like manner with a plurality of recesses, which are exemplarily cylindrical and are circumferentially evenly spaced from one another, of which only a recess 746 is visible here. The recesses are only exemplary as cylindrical (blind) bores.

In contrast to all of the embodiments described above, the locking device 720 has a footrest 750 to be actuated by the user with his foot for actuating a purely mechanical parking brake 752 of the stroller 102. The normal operating state of the locking device 720 of the stroller 102 can - as indicated by the symbolized arrow 756 - e.g. by depressing the footrest 750, a turntable 754 coupled to the footrest 750 preferably rotates about 90 ° about the axle holder 700 until the plunger 232, which springs out axially in the direction of the turntable 754, preferably axially in the direction of the turntable 754, into a detent geometry 758 Turntable 754 engages and the footrest 750 is locked in the reached rotational position. During the rotational movement of the turntable 754 effected by the user, a torsion spring element 760 of the locking device 720 is preferably mechanically pretensioned on the circumference.

The turntable 754 preferably also has a bevel 762 or a circumferential, inclined run-on plane for the head 738 of the bolt 726. Because of the axial prestressing of the bolt 726 with the aid of the spring element 734, the head 738 of the bolt 726 is preferably at least essentially free of play the slope 762. When the footrest 750 of the parking brake 752 is depressed, the bolt 726 - as indicated by the arrow 764 - executes an axial extension movement away from the housing 742 due to the axially preloaded spring element 734, as a result of which the blocking section 730 of the bolt 726 and the engaging geometry 744 disengage. As a result, the rotor carrier 710 can rotate freely in relation to the axle holder 700 in the normal operating state shown here. A change from the normal operating state of the locking device 720 to the safe blocking state can be done on the one hand by at least briefly energizing the cylinder magnet 228 or, for example, by lifting the footrest 750 on the user side with the foot against the direction of the symbolically indicated arrow 756 or done from the drawing level. In both cases, the bolt 726 or the blocking member 724 is preferably inserted axially into the engaging geometry 744 of the rotor carrier 710 automatically due to the force of the prestressed torsion spring element 760 with the aid of the axially advancing bevel 762 of the rotating turntable 754.

FIG. 11 shows a perspective view of the drive wheel 130 with the locking device 720 from FIG. 10 in the normal operating state. For example, by lifting the footrest 750 of the mechanical parking brake 752 in the direction of the arrow 766 on the basis of the operating state given here, the blocking state of the locking device 120 of the drive wheel 130 of the stroller 102, which can be driven by the electric drive unit 140, can be independent of the electromagnetic part of the locking device 720 are activated, at the same time the torsion spring element, which is not visible here, is pretensioned (cf. in particular FIG. 12). In the course of the rotational movement of the turntable 754 effected by means of the footrest 750, the bevel 762 pushes the blocking member 724 preferably axially into the rotor carrier 710 until the blocking state is reached.

FIG. 12 shows the locking device 720 of FIG. 10 in the locked state. In the blocking state shown here, there is preferably an at least regionally positive connection between the blocking section 730 or the cylinder section 732 of the bolt 726 and the engagement geometry 744 of the rotor carrier 710.

The normal state can preferably be set exclusively by lifting the footrest 750 on the user side in the direction of the symbolically indicated arrow 768, the turntable 754 preferably executing a rotary movement of approximately 90 ° from the rotational position shown here and at the same time the torsion spring element 760 on the circumference is biased. At the end of this rotational movement, the plunger 232 protruding axially resiliently from the de-energized electromagnet 228 and the latching geometry 758 of the turntable 754 preferably engage so that the turntable 754 locks is. As a result of the bevel 762 of the rotating turntable 754 axially receding in the course of the rotational movement, the bolt 726 is preferably pushed out of the engagement geometry 744 of the rotor carrier 710 due to the force of the axially preloaded spring element 734, as indicated by the arrow 770.

By at least briefly depressing the footrest 750, the latching geometry 758 of the turntable 754 and the plunger 232 of the electromagnet 228 can be disengaged again in order to activate the locked state and the safe locked state can be set. Alternatively, the blocking state of the locking device 720 can preferably be activated by at least briefly energizing the cylinder magnet 228, as a result of which the tappet 232 and the engaging geometry 758 of the turntable 754 disengage and the onset of the rotational movement of the turntable 754 for the automatic insertion of the bolt 726 in the rotor carrier 710 is triggered by the force effect of the prestressed torsion spring element 760. The respective (angle of rotation) position of the footrest 750 (raised or depressed) of the parking brake 752 preferably functions at the same time as a mechanical-optical display of the blocking state and the normal operating state of the locking device 720 for the user.

FIG. 13 shows the drive wheel 130 with the locking device 720 from FIG. 10 in the locked state. As a result of the footrest 750 of the mechanical parking brake 752 of the pram 102 being stepped down in the direction of the arrow 772, the turntable 754 preferably rotates, as a result of which the torsion spring element, which is not visible here, is pretensioned. Due to the then axially receding bevel 762 of the turntable 754, the blocking member 724, which is likewise axially biased in the direction of the turntable 754, and the rotor support 710 of the electric drive unit 140 of the drive wheel 130 of the stroller 102 disengage and the normal operating state of the locking device 720 is again reached. Due to the latching of the plunger of the cylinder magnet 228, which is not shown here, into the latching geometry of the turntable 754, this state is preferably maintained permanently, even against the force of the then prestressed torsion spring element. 14 shows a further embodiment 800 of the locking device 150 with a foot-operated parking brake 868 in the normal operating state. The drive wheel 130 of the stroller 102, which is rotatably fastened to the chassis 106 of the stroller 102, can be driven by an electric motor by means of the electric drive unit 140 to partially support the pushing and pulling operation. The locking device 800 preferably includes, among other things, the cylinder magnet 228 with the housing 230 and the plunger 232, as well as a blocking member 802, which is formed with a substantially cylindrical bolt 804, and a turntable 810 which can be mechanically preloaded on the circumference by means of a torsion spring element 808. In the de-energized state of the cylinder magnet 228, the plunger 232 preferably pushes itself out of the housing 230 due to the force of an internal spring. By energizing the cylinder magnet 228, however, the plunger 232 preferably retracts at least partially into the housing 230 of the cylinder magnet 228.

The bolt 804 is preferably axially prestressed in the direction of the turntable 810 by means of a spring element 814. The turntable 810 preferably has an annular base body 820 with a bore-like engagement geometry 822 for the tappet 232 of the cylinder magnet 228. A turntable 824, which is in the form of a segment of a circle, is preferably also formed on the turntable 810. A wedge body 826 pointing in the direction of the bolt 804 with an axially retracting bevel 828 for the bolt 804 is preferably formed on the holder 824. The wedge body 826 approximately has a geometry that corresponds to that of a hollow cylinder segment.

14a shows the locking device 800 from FIG. 14, the plunger 232 of the cylinder magnet 228 being in engagement with the turntable 810. In particular, the cylindrical magnet 228 is preferably at least partially positively engaged with the engagement geometry 822 of the turntable 810 associated with the preferably annular base body 820. The turntable 810 is preferably preloaded on the circumference by means of the torsion spring element 808. A rotor carrier 830 of the electric drive unit (cf. in particular FIG. 14, reference number 140) of the pram 102 preferably has an engaging geometry 834 which is provided with a plurality of recesses 836 or Recesses are realized, which represent a catch 838. The recesses 836 are here only exemplarily designed as non-continuous, cylindrical (blind bores) into which a blocking section 840 of the bolt 804 can be inserted at least partially in a form-fitting manner when the locking device 800 is blocked. The blocking section 840 of the bolt 804 is to facilitate insertion of the bolt 804 is preferably formed with a chamfered cylindrical section 842. Due to the axial prestressing of the bolt 804 by the spring element 814, the bolt 804 is preferably always in contact with the bevel 828 of the wedge body 826 of the turntable 810 with a defined force 824 of the turntable 810, an arcuately curved guide rib 832 for guiding the turntable 810 is also formed on a housing part of the locking device 800, not shown here.

14b shows the locking device 800 assigned to the drive wheel 130 of the stroller 102, which preferably includes the cylinder magnet 228 among other things. The tappet 232 of the cylinder magnet 228 is in engagement with the engagement geometry 822 of the turntable 810, which is prestressed by means of the torsion spring element 808. This preferably prevents the turntable 810 from moving in the direction of the turn arrow 844 or the force acting on the circumference to subsequently rotate the prestressed torsion spring element 808 and to push the bolt 804 into one of the recesses 836 of the engagement geometry 822 to activate the blocking state of the locking device 800. The bolt 804, which is preferably preloaded axially in the direction of the slope 828 of the wedge body 826 of the turntable 810 and the engagement geometry 834 of the rotor carrier 830 of the drive wheel 130 are therefore not in engagement, so that the normal operating state of the locking device 800 is permanently activated.

A first locking ring 846 is preferably arranged axially adjacent to the cylinder section 842 of the bolt 804 or the blocking member 802 functioning as the blocking section 840 on a shaft 848 of the bolt 804. A second locking ring 852 is preferably fastened to a contact end 850 of the pin 804 for the bevel 828 of the turntable 810 which is directed away therefrom. The spring element 814 is preferably arranged on the shaft 848 of the bolt 804 between the two locking rings 846, 852. Between the The spring element 814 and the second locking ring 852 are preferably provided with an annular underlay 854 for the spring element 814.

FIG. 14c shows the locking device 800 from FIG. 14 in the normal operating state. The drive wheel 130 with the rotor carrier 830 attached to it is rotatably received by means of a bearing 856 on an axle holder 860 of the chassis 106 of the stroller 102. The pin 804 is preferably axially displaceably received in a section of a stepped bore 862 in the axle holder 860 that is smaller in diameter and is not shown for the sake of a better overview of the drawing. The spring element 814 is preferably arranged in sections in a larger diameter section of the stepped bore 862, which is also not shown for the sake of a better overview of the drawing, and is supported between a shoulder 864 of the stepped bore 862 and the backing 854 adjacent to the securing ring 852. The contact end 850 of the pin 804 is therefore spring-loaded against the slope 828 of the turntable 810. The cylinder section 842 serving as the blocking section 840 is not in engagement with the engaging geometry 834 of the rotor carrier 830, so that it can rotate freely in relation to the axle holder 860 in the normal operating state of the locking device 800 given here. In the state of the turntable 810, which is preloaded on the circumferential side by means of the torsion spring element 808, this is preferably held by the hidden plunger 232 of the cylinder magnet 228 and prevented from rotating in the direction of the rotation arrow 844.

The locking state of the locking device 800 can be activated by the user lifting a footrest 866 of the parking brake 868, which is only indicated in the drawing, or by briefly energizing the cylinder magnet 228. The parking brake 868 or the footrest 866 is preferably mechanically coupled to the turntable 810 in a suitable manner. In both cases, the turntable 810, which is mechanically preloaded on the circumferential side by means of the torsion spring element 808, is released so that it preferably performs a rotational movement in the direction of the rotation arrow 844. As a result, the cylinder section 842 of the bolt 804 — contrary to the force effect of the spring element 814 — is preferably made by the bevel 828 of the turntable 810 axially advancing in the direction of the rotor carrier 830 in proportion to the angle of rotation into the engagement geometry 834 of the Rotor carrier 830 indented or inserted. This process can be triggered automatically by electronically actuating the cylinder magnet 228 by means of the control and / or regulating device (cf. FIG. 1; reference number 160) or the control device integrated in the locking device 800 (cf. FIG. 2, reference number 220) in order to avoid, for example, increased power consumption of the stroller 102. An increased power consumption of the stroller 102 can occur, for example, when its drive wheels (so-called "SmartWheels ^® ") are constantly energized in order to maintain a constant position on the ground.

FIG. 14d shows the locking device 800 from FIG. 14 in the locked state. In the blocking state of the locking device 800 illustrated here, preferably a first end section 870 of the bevel 828 of the turntable 810 presses the cylinder section 842 of the bolt 804 against the force action of the prestressed spring element 814 into the engagement geometry 834 of the rotor carrier 830 of the drive wheel 130. The first end section 870 of the slope 828 or the wedge body 826 has a maximum axial height Hi. As a result, the rotor carrier 830 with the drive wheel 130 can no longer rotate in relation to the axle holder 860 and the locking state of the locking device 800 is active. The torsion spring element 808 is preferably at least partially relaxed in the locked state.

For safety reasons, the blocking state of the locking device 800 can preferably be released only through direct mechanical user intervention. This user intervention can e.g. by depressing the footrest 866 of the parking brake 868 on the chassis 106 of the stroller 102, which footrest 866 is only indicated in the drawing. The turntable 810 is preferably rotated in the direction of the arrow 872 while the torsion spring element 808 is tensioned at the same time until the plunger 232 of the cylinder magnet 228 hidden here is locked in place with the turntable 810 and the normal operating state of the locking device 800 is reached.

In the normal operating state, a second end section 874 of the bevel 828, in the area of which the wedge body 826 of the turntable 810 has a minimum axial height H ₂ , preferably bears against the contact section 850 of the bolt 804. As a result, the cylinder section 842 of the bolt 804 is through the spring element 814 preferably completely disengaged from the engaging geometry 834 of the rotor carrier 830 and releases it. As a result, the normal operating state of the locking device 800 is reached again, in which the rotor carrier 830 with the drive wheel 130 can freely rotate in relation to the axle holder 860.

However, it is pointed out that the embodiments shown are only exemplary in nature and the present invention is not restricted to the embodiments shown. In this way, the individual embodiments can also be combined with one another. For example, the embodiments of the locking device 150 from FIGS. 2 to 4,

300 from FIGS. 5, 430 from FIGS. 6 to 6b, 510 from FIGS. 7 to 7a, 610 from FIGS. 8 to 8a, a parking brake 752 from FIGS. 10 to 13 and 868 from 14 to 14d, which is coupled to the locking device. Furthermore, the embodiments of the display device 260 from FIGS. 3, 458 from FIGS. 6 to 6a, 548 from FIGS. 7 to 7a, 646 from FIGS. 8 and 8a can also be combined with one another and / or combined with the locking devices 720 from FIGS. 10 to 13, 800 from FIGS. 14 to 14d. In addition, the individual locking devices 150 from FIGS. 2 to 4, 300 from FIGS. 5, 430 from FIGS. 6 to 6b, 510 from FIGS. 7 to 7a, 610 from FIGS. 8 to 8a, 720 from FIGS. 10 to 13, 800 from FIGS. 14 to 14d, the engagement geometry 246 from FIGS. 2 to 5, 440 from FIGS. 6 to 6b, 520 from FIG 7 to 7a, 626 from FIG. 8 to 9, 744 from FIG. 10, 834 from FIG. 14a in the manner of a toothing 248, 308, a detent 444, 524, 748, 838 and / or have a recess 632, 246. The respective embodiments of the engagement geometries can also be combined with one another.

Claims

Expectations

1. Transport device (100), in particular a stroller (102), with at least three wheels (120, 122, 124) for movement on a surface (1 16) and a handle (1 12) for a user, with at least one wheel (120, 122, 124) is designed as a drive wheel (130, 132) which can be driven by an electric motor by means of an assigned electric drive unit (140, 142) in order to provide at least partial electromotive support for manual sliding or To enable the user to pull the transport device (100), characterized in that the drive wheel (130, 132) has an at least electromagnetic locking device (150, 152, 300, 430, 510, 610, 720,

800), which is designed to automatically block the drive wheel (130, 132) in the event of a fault, in particular when the user is absent or an at least partial failure of a power supply (144), for rapid change from the operating state to a blocking state ,

2. Transport device according to claim 1, characterized in that the drive wheel (130, 132) a rotor carrier (200, 302, 410, 502, 602, 710, 830) with a rim (202, 418, 504, 604, 712) for has a tire, the rotor carrier (200, 302, 410, 502, 602, 710, 830) and the rim (202, 418, 504, 604, 712) being formed in one or two parts.

3. Transport device according to claim 2, characterized in that the locking device (150, 152, 300, 430, 510, 610, 720, 800) an energizable cylinder magnet (228) with a plunger (232) and a blocking member (234, 432, 512, 612, 724, 802), the blocking member (234, 432, 512, 612, 724, 802) being designed to block the rotor carrier (200, 302, 410, 502, 602, 710, 830 ) to prevent rotation.

4. Transport device according to claim 3, characterized in that the blocking member (234, 432, 512, 612, 724, 802) has a blocking section (242, 446, 526, 636, 730, 840) which in the blocked state with an engagement geometry (246, 440, 520, 626, 744, 834) on the rotor carrier (200, 302, 410, 502, 602, 710, 830) can be positively engaged at least in some areas, the engagement geometry (246, 440, 520 , 626, 744, 834) in the manner of a toothing (248, 308), a detent (444, 524, 748, 838) and / or a recess (632).

5. Transport device according to claim 3 or 4, characterized in that the blocking member (234, 432, 512, 612, 724, 802) is designed as a bolt (238, 434, 514, 614, 726, 804) and coaxial or parallel to an axis (1 10, 236, 404, 704) of the rotor carrier (200, 302, 410, 502, 602, 710, 830) is arranged.

6. Transport device according to one of claims 3 to 5, characterized in that the blocking member (234, 432, 512, 612, 724, 802) is assigned a spring element (254, 452, 536, 650, 734, 814) which is designed to pretension the blocking member (234, 432, 512, 612, 724, 802) in the blocking state.

7. Transport device according to one of claims 3 to 6, characterized in that the blocking member (234, 432, 512, 612, 724, 802) has an annular groove (250, 438, 518, 620), with the arrangement of the blocking member (234, 432, 512, 612, 724, 802) in the operating state a locking element (252) is arranged in the annular groove (250) or the plunger (232) of the cylinder magnet (228) is arranged in the annular groove (438, 518, 620) is.

8. Transport device according to one of claims 3 to 7, characterized in that the cylinder magnet (228) is arranged in the axial or radial direction of the blocking member (234, 432, 512, 612, 724, 802).

9. Transport device according to one of claims 3 to 8, characterized in that the plunger (232) in the de-energized state of the cylinder magnet (228) automatically at least partially in a housing (230) of the Pulls the cylinder magnet (228) back or pushes it out of the housing (230).

10. Transport device according to one of the preceding claims, characterized in that the locking device (150, 152, 300, 430, 510, 610, 720, 800) a display device (260, 458, 548, 646) for optically signaling the blocking state and the operating state.

1 1. Transport device according to one of the preceding claims, characterized in that a change from the locked state to the operating state is possible only by mechanical user intervention by the user.

12. Transport device according to one of the preceding claims, characterized in that the locking device (720, 800) interacts with a mechanical parking brake (752, 868) in such a way that the change from the locked state to the operating state by the user actuating one of the parking brakes (752, 868) associated footrest (750, 866) is independent of the locking device (720, 800).

13. Transport device according to claim 10 and 1 1, or according to claim 10 and 12, characterized in that the resetting of the blocking state into the operating state exclusively by a mechanical user actuation of the display device (260, 458, 548, 646) of the blocking link (234, 432, 512, 612) or the footrest (750, 866) of the parking brake (752, 868).

14. Transport device according to one of claims 3 to 13, characterized in that the locking device (150, 152, 300, 430, 510, 610, 720, 800) is assigned a control device (220), which is designed to the cylinder magnet (228) to be controlled electronically.

15. Transport device according to one of claims 12 to 14, characterized in that the at least one drive wheel (130) has an axle holder (700, 860) and the locking device (720, 800) has a turntable (754, 810) with a slope (762, 828) is assigned, the turntable (754, 810) is rotatable in relation to the axle holder (700, 860) and where, when the turntable (754, 810) rotates, the blocking member (724, 802) along the bevel (762, 828) axially into the blocking state or Operating state moved.