TWI602729B - Portable vehicle - Google Patents

Description

Mobile vehicle

The present invention relates to a carrier, and more particularly to a mobile carrier that can carry an object (item or creature).

The conventional mobile carrier generally includes a body and three or more wheels, and the object to be carried can be positioned at a preset position of the body, and the plurality of wheels are rotatably disposed on the body, and The bottoms of the plurality of wheels are coplanar to jointly support and maintain the body without tipping; accordingly, the body can carry an object, and when the plurality of wheels rotate, the body and the carried object are driven on a plane mobile.

However, since the conventional mobile carrier can only support the body supported by the plurality of wheels, in the process of transporting the object, if it encounters a non-planar special terrain (for example, a rugged road section or a staircase), Conventional mobile vehicles will not be able to continue to transport objects, and must be transported by human or other alternative means, resulting in reduced efficiency and cost increases.

For the above reasons, the conventional mobile carrier has been improved.

It is an object of the present invention to provide a mobile carrier that can continuously carry objects on a flat or non-planar terrain.

In order to achieve the foregoing objectives, the technical content of the present invention includes: a mobile carrier comprising: a carrier body having a support frame and a loading platform disposed at a top end of the support frame; a main support module having a driving wheel, a first driver for driving the driving wheel, and a driven wheel, the driving wheel and the driven wheel The support frame is respectively located at two ends of the center of gravity of the carrier body; and two auxiliary support modules are respectively disposed on two sides of the support frame, and each of the auxiliary support modules includes a flip drive and a crawler arm And a ladder wheel assembly, the flip driver is disposed on the support frame, the track arm is connected to the flip drive, and the climber wheel assembly is disposed at one end of the crawler arm.

The main support module may include another driving wheel. The two driving wheels are disposed on one end of the supporting frame, and the driven wheel is disposed at the other end of the supporting frame.

Wherein, the first driver may be a hub motor to be integrated inside the driving wheel.

Wherein, the driving wheel can be directly assembled to the support frame of the carrier body, and the driven wheel can be indirectly connected to the support frame of the carrier body by a shock absorber and a first linear actuator.

The two ends of the shock absorber are respectively connected to the support frame and the driven wheel, and the two ends of the first linear actuator are respectively connected to the support frame and the shock absorber.

Wherein, the crawler arm comprises two parallel and spaced partitions, a track set is arranged between the two partitions, and a second drive is arranged on the outer side of one of the two partitions for connecting and driving The track set is further operated; the track arm further comprises a connector and a second linear actuator, one end of the connector is connected to the output end of the flip drive, and the other end is connected to one of the two partitions; the second One end of the linear actuator is connected to the connector, and the other end is connected to one of the two partitions.

Wherein each of the partitions has an opposite outer flange and an inner concave edge, and the outer edge of the track set protrudes beyond the outer flanges of the two partitions.

Wherein, the connector can be a shock absorber.

Wherein, the outer side of one of the two partitions may be provided with a first connecting member. The connector is connected to the first connecting member; the outer side of one of the two partitions may be provided with a second connecting member, and the second linear actuator is connected to the second connecting member; the first connecting member is adjacent At the bend of the two partitions, the second connecting member is closer to the end of the two partitions.

The first connecting member and the second connecting member may be disposed outside the same partition.

The first connecting member, the second connecting member and the second driver may be disposed outside the same partition.

Wherein, the crawler arm may further provide a partition outside the partition plate provided with the first connecting member and the second connecting member, and the two ends of the first connecting member and the second connecting member are respectively connected to the partition plate .

Wherein, the track set may comprise a track and two end wheels abutting the track, an inner tensioning wheel and an outer tensioning wheel, the track set protruding from the outer edge of the track beyond the two partitions The outer end flanges, the inner end tensioning wheel and the outer tensioning wheel are respectively rotatably disposed between the two partition plates; the two end wheels respectively abut against the inner circumferential surface of the crawler belt Two ends, and one of the two end wheels is connected to the second driver; the inner tensioning wheel abuts against the inner circumferential surface of the track, and the crawler belt is bent and adjacent to the two partitions The outer tensioning wheel is in mesh with the track and is located at a concave edge of the track that is bent and adjacent to the two partitions.

Wherein, the ladder wheel assembly can include a rotating disk and a plurality of wheels, the rotating disk has a central hole and a plurality of pivoting portions, the plurality of pivoting portions are equiangularly distributed with respect to the central hole; The central hole is connected to the output end of the second driver, and the plurality of pivoting portions are respectively pivotally connected to the plurality of wheels.

The ladder wheel assembly may be disposed outside the outermost partition plate, and the output end of the second driver is coaxially connected to the rotating disk and the end wheel adjacent to the second connecting member.

Accordingly, the mobile carrier of the present invention can be held on a flat or non-planar terrain. Continue to deliver objects to increase the efficiency of carrying objects and reduce the cost of carrying objects.

1‧‧‧ Vehicle body

11‧‧‧Support frame

12‧‧‧ stage

121‧‧‧Fixed parts

122‧‧‧ seats

123‧‧‧ Controller

124‧‧‧ rotating seat

2‧‧‧Main support module

21‧‧‧Drive wheel

22‧‧‧First drive

23‧‧‧ driven wheel

24‧‧‧ Shock absorbers

25‧‧‧First Linear Actuator

3‧‧‧Auxiliary support module

31‧‧‧ flip drive

32‧‧‧ Track arm

321‧‧‧Baffle

321a‧‧‧Outer flange

321b‧‧‧ concave edge

3211‧‧‧First connector

3212‧‧‧Second connector

322‧‧‧ Track Team

3221‧‧‧ Tracks

3222‧‧‧end wheel

3223‧‧‧Internal tensioner

3224‧‧‧External tensioner

323‧‧‧second drive

324‧‧‧Connector

325‧‧‧Second linear actuator

33‧‧‧Climbing wheel assembly

331‧‧‧ rotating disk

3311‧‧‧Center hole

3312‧‧‧ pivotal department

332‧‧‧ Wheels

G‧‧‧ Ground

P‧‧‧ power source

S‧‧‧ convex slope

Fig. 1 is a perspective view showing the structure of an embodiment of the mobile carrier of the present invention.

Figure 2 is a partial exploded perspective view of the auxiliary support module of the mobile carrier of the present invention.

Figure 3 is a schematic view showing the implementation of the mobile carrier of the present invention moving on a planar terrain.

Figure 4: Schematic diagram of the implementation of the mobile carrier of the present invention moving over rough terrain.

Fig. 5 is a schematic view showing the implementation of the mobile carrier of the present invention when carrying an object up the stairs.

Figure 6 is a schematic view showing the implementation of the mobile carrier of the present invention when carrying an object down the stairs.

Figure 7 is a perspective view showing the structure of another embodiment of the mobile carrier of the present invention.

The above and other objects, features and advantages of the present invention will become more <RTIgt; An embodiment of the mobile carrier of the present invention. The mobile carrier includes a carrier body 1, a main support module 2 and two auxiliary support modules 3; the main support module 2 and the two auxiliary support modules 3 are disposed on the carrier The body 1 and the two auxiliary support modules 3 are reversed relative to the carrier body 1.

The carrier body 1 is used to carry an object and assemble the locator for each component; in the embodiment, the carrier body 1 includes a support frame 11 and a carrier 12, and the support frame 11 can have a sufficient strength. The hollow frame is arranged for the component of the mobile carrier to be stably assembled and positioned on the support frame 11 or even hidden in the space inside the support frame 11, so that the appearance of the mobile carrier is relatively simple and uncluttered. The stage 12 can be coupled to the top end of the support frame 11 for placing an object. Wherein, the object that the mobile vehicle can carry can be goods, etc. The article may also be a human or other animal or plant, and the volume of the mobile vehicle, as well as the shape of the support frame 11 and the stage 12, may be adjusted according to the needs of use, which is common knowledge in the field. It will be understood that the invention is not limited. For example, in the embodiment shown in FIG. 1, the mobile carrier is used to carry an article, so the stage 12 can be a platform or a box having an open top end, and the The periphery of the stage 12 may also be provided with a plurality of fixing members 121, which may be, for example, buckles or hooks for the rope to be wound around to secure the articles placed on the stage 12.

Referring to Figures 1 and 3, the main support module 2 includes a drive wheel 21 and a a first driver 22 and a driven wheel 23 for driving the driving wheel 21, wherein the driving wheel 21 and the driven wheel 23 are respectively disposed on the support frame 11 of the carrier body 1, and are respectively located at the center of gravity of the carrier body 1. The two ends collectively provide a supporting effect on the carrier body 1 so that the mobile carrier can be maintained without being tilted while being stationary or moving. In the embodiment shown in FIG. 1 , the number of the driving wheels 21 can be two, and the two driving wheels 21 are disposed on two sides of the front end of the supporting frame 11 , and the driven wheel 23 is set. In the middle of the rear end of the support frame 11, the three-point support is formed on the carrier body 1 so that the mobile carrier can maintain no dumping even when it is stationary, so as to load or unload the stage 12. In addition, the number of the driving wheels 21 is larger than the number of the driven wheels 23, and the load capacity and the moving efficiency of the mobile carrier can also be improved.

In more detail, the driving wheel 21 can be directly assembled to the carrier body 1 The bracket 11 is connected to the shaft of the driving wheel 21 to drive the connected driving wheel 21 to rotate; preferably, the first driver 22 can be selected as a hub motor for integration with the driving wheel 21 In addition, the installation space can be saved, and the performance of the overall mobile vehicle can be improved by the fact that the hub motor is lighter in weight, more power-saving, better in endurance and convenient in maintenance and maintenance.

On the other hand, the driven wheel 23 can be selected by a shock absorber 24 and a first The linear actuator 25 is indirectly connected to the support frame 11 of the carrier body 1; that is, the shock absorber The two ends of the second linear actuator 25 are respectively connected to the support frame 11 and the shock absorber 24 to be connected by the shock absorber 24 The driven wheel 23 provides a shock absorbing effect, and the position of the driven wheel 23 relative to the support frame 11 is changed by the first linear actuator 25, so that the driven wheel 23 can be selected with the driving wheel 21 or the two The auxiliary support module 3 supports the carrier body 1 in common.

Referring again to FIG. 1, the two auxiliary support modules 3 are respectively disposed on the carrier The two sides of the support frame 11 of the body 1 are configured to selectively support the carrier body 1 together with the main support module 2 when the mobile carrier encounters a special terrain, so that the mobile carrier can carry objects Move on special terrain. In this embodiment, each of the auxiliary support modules 3 includes a flip drive 31, a crawler arm 32 and a ladder wheel assembly 33. The flip drive 31 can be selectively disposed inside the support frame 11, and the flip drive 31 can be The output end faces the side end of the support frame 11 for the crawler arm 32 to be connected, so that the track arm 32 is reversed relative to the carrier body 1 by the flip driver 31; the crawler wheel assembly 33 is disposed on the crawler belt One end of the arm 32.

Please refer to FIG. 2, the crawler arm 32 includes two partitions 321 , the second The partitions 321 are spaced apart from each other and are parallel to each other; preferably, each of the partitions 321 has a bent meander shape and has an opposite outer flange 321a and an inner concave edge 321b. A track set 322 is disposed between the two partitions 321 . The outer edge of the track set 322 protrudes beyond the outer flange 321a of the two partitions 321; the outer sides of one of the two partitions 321 are provided A second driver 323 operates to connect and drive the track set 322. The crawler arm 32 further includes a connector 324 and a second linear actuator 325. One end of the connector 324 is connected to the output end of the flip driver 31, and the other end is connected to one of the two partitions 321; One end of the two linear actuator 325 is connected to the connector 324, and the other end is also connected to one of the two partitions 321 . The connector 324 can also be selected as a shock absorber. The second linear actuator 325 can be, for example, an electric screw or an electric pressure cylinder.

In more detail, one of the two partitions 321 may be optionally provided on the outer side of one of the two partitions 321 The first connecting member 3211 is connected to the connector 324; and a second connecting member 3212 is disposed outside the one of the two partitions 321 for the second linear actuator 325 to be connected. Wherein, the first connecting member 3211 is closer to the bending portion of the two partition plates 321 , and the second connecting member 3212 is closer to the end portion of the two partition plates 321; preferably, the first connecting member The 3211 and the second connecting member 3212 can be selectively disposed on the outer side of the same partition plate 321, so that the second linear actuator 325 can push the partition plate 321 relatively smoothly. More preferably, the first connecting member 3211, the second connecting member 3212 and the second driver 323 are both disposed outside the same partition 321 to save space.

In addition, in this embodiment, the crawler arm 32 can also be provided with the first connection. A partition plate 321 is further disposed on the outer side of the partition plate 321 of the connecting member 3211 and the second connecting member 3212, and the three partition plates 321 are spaced apart from each other and parallel to each other, so that the first connecting member 3211 and the second connecting member 3212 are The end can be connected to the partition 321 to help increase the structural strength of the first connecting member 3211 and the second connecting member 3212, so that the first connecting member 3211 and the second connecting member 3212 are not easily broken; The second driver 323 can be provided with a protective effect that the second driver 323 is less susceptible to collision.

Moreover, the track set 322 can include a crawler 3221 and abut the track 3221 Two end wheels 3222, an inner tensioning wheel 3223 and an outer tensioning wheel 3224, and the track set 322 protrudes beyond the outer flange 321a of the two partitions 321 by the outer edge of the track 3221, and Increase the grip for the grounding surface if necessary. The two end wheels 3222, the inner tensioning wheel 3223 and the outer tensioning wheel 3224 are respectively rotatably disposed between the two partitions 321 and are maintained axially parallel to each other. The two end wheels 3222 abut the two ends of the inner circumferential surface of the crawler belt 3221, and one of the two end wheels 3222 is connected to the second driver 323 to be driven by the second driver 323. The end wheel 3222 rotates to interlock with the integrated track set 322; the inner tension wheel 3223 abuts against the inner circumferential surface of the track 3221, and the track 3221 is bent and adjacent to the two partitions 321 At the flange 321a; the outer tensioning wheel 3224 is in mesh with the crawler 3221. And the crawler 3221 is bent and adjacent to the inner concave edge 321b of the two partitions 321 .

The ladder wheel assembly 33 includes a rotating disc 331 and a plurality of wheels 332. The movable plate 331 has a central hole 3311 and a plurality of pivoting portions 3312. The plurality of pivoting portions 3312 are equiangularly distributed with respect to the central hole 3311. The center hole 3311 of the rotating disk 331 is connected to the output end of the second driver 323 to drive the rotating disk 331 to rotate by the second driver 323. The plurality of pivoting portions 3312 are respectively pivotally connected to the plurality of wheels 332. . In this embodiment, the ladder wheel assembly 33 can be disposed outside the outermost partition plate 321 , and the output end of the second driver 323 is coaxially connected to the rotating disk 331 and adjacent to the second connecting member. End wheel 3222 of 3212.

It is worth mentioning that the mobile carrier of the present invention has a power source P, which is The source P is used to provide energy for the main support module 2 and the auxiliary support module 3 when the operation is performed. The type of the power source P is not particularly limited, and may be driven by electric power or by For example, when the energy required for the main support module 2 and the auxiliary support module 3 is electric power, the power source may be, for example, a rechargeable battery or a solar battery. In this embodiment, the power source P can be assembled to the support frame 11 of the carrier body 1 and provided to the first driver 22 of the main support module 2 and the flip driver 31 of the auxiliary support module 3, respectively. The second driver 323 and the like are electrically connected to provide power required for the operation by the power source P.

According to the foregoing structure, the mobile carrier of the present invention can change its operation depending on the terrain. For example, referring to FIG. 3, on a general road surface, the mobile carrier selects the driving wheel 21 and the driven wheel 23 of the main supporting module 2 to contact the ground G, and maintains the two. The outer flange 321a of the partition plate 321 of the auxiliary support module 3 faces the ground G. In this way, when the mobile carrier travels on the plane section, the first driver 22 can drive the corresponding driving wheel 21 to rotate, thereby driving the overall mobile carrier to translate relative to the ground G.

In addition, if a rough section of the ground G having a convex slope S is encountered during walking, the second driver 323 can be controlled to drive the track set 322 to start operation; thus, when the crawler belt 3221 When the portion protruding from the outer flange 321a of the partition 321 contacts the convex slope S, the crawling slope S can be climbed by the crawler belt 3221 to increase the grip force to assist the pulling of the driving wheel 21 to make the overall mobile vehicle It can smoothly advance through the convex slope S. On the other hand, when the driven wheel 23 passes the convex slope S, the shock absorber 24 can slow the vibration transmitted from the driven wheel 23 to the carrier body 1.

Please refer to Figure 4, when the mobile vehicle encounters a large amount of gravel or ooze In the rugged section, due to the limited grip provided by the driving wheel 21, the slipping and idling often occurs on such sections, and it is almost impossible to drive the overall mobile carrier forward; at this time, the first line can be controlled. The actuator 25 and the second linear actuator 325 are actuated to shorten the driving wheel 21 away from the ground G, and the track set 322 and the driven wheel 23 contact the ground G and jointly support the carrier body 1 and The stage 12 of the carrier body 1 is maintained horizontal without dumping the carried object. In this way, the track 3221 of the track set 322 can generate sufficient grip to drive the overall mobile carrier to smoothly advance on a rough road section with a large amount of gravel or slime.

Please refer to Figures 5 and 6, when the mobile vehicle encounters a staircase with a continuous step In the case of the terrain, the inversion drive 31 of the two auxiliary support modules 3 can respectively drive the corresponding crawler arm 32 to be reversed relative to the carrier body 1 so that the partitions 321 of the two auxiliary support modules 3 have inner concave edges. The 321b faces the ground G, and the wheel 332 of the ladder wheel assembly 33 contacts the driving wheel 21 of the main supporting module 2 to the ground G, and supports the carrier body 1 together. In this way, when the mobile carrier is going up the stairs (as shown in FIG. 5), the second driver 323 can drive the corresponding rotating disk 331 to rotate, so that the pulling of the driving wheel 21 matches the ladder. The wheel assembly 33 is climbed one step at a time, so that the mobile carrier can smoothly carry objects up the stairs.

In contrast, when the mobile vehicle is going down the stairs (as shown in Figure 6), the same The second drive 323 can drive the corresponding rotating disc 331 to rotate in the reverse direction, so that the crawler wheel assembly 33 can be climbed one step by one step, so that the mobile carrier can smoothly carry the object and climb down the stairs. It should be noted that, in the process of descending the stairs, the first driver 22 preferably stops driving the corresponding driving wheel 21 to rotate, thereby avoiding the thrust formed by the driving wheel 21. The bulk of the mobile vehicle is overturned; alternatively, the driving wheel 21 can be braked to avoid accidental overturning.

Please refer to FIG. 7 , which is another embodiment of the mobile carrier of the present invention. The components of the movable carrier are substantially the same as the above embodiments, and the main difference is only that the mobile carrier is used to carry a person in this embodiment, so that the carrier 12 can be provided with a seat. a chair 122 and a controller 123 located in front of the seat 122 for the user to ride on the seat 122 and control the direction and mode of operation of the mobile vehicle by manipulating the controller 123 . Preferably, the stage 12 is further provided with a rotating seat 124, and the seat 122 is assembled above the rotating base 124, so that when the mobile carrier changes the traveling direction (especially when going down the stairs), The rotating seat 124 drives the seat 122 to turn, so that the user can maintain the traveling direction of the mobile vehicle to improve the convenience and safety of the operation.

In summary, the mobile carrier of the present invention can be set by an auxiliary support module. The operating mode is changed according to the terrain selection, so that the object can be continuously carried on the plane or non-planar terrain, and the object can be smoothly delivered to the destination without encountering a special terrain that is non-planar (for example, a rugged road section or In the case of stairs, the object is moved by human or other alternative means; therefore, the mobile carrier of the present invention can achieve the effects of improving the efficiency of carrying objects and reducing the cost of carrying objects.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

1‧‧‧ Vehicle body

11‧‧‧Support frame

12‧‧‧ stage

121‧‧‧Fixed parts

2‧‧‧Main support module

21‧‧‧Drive wheel

22‧‧‧First drive

23‧‧‧ driven wheel

24‧‧‧ Shock absorbers

25‧‧‧First Linear Actuator

3‧‧‧Auxiliary support module

31‧‧‧ flip drive

32‧‧‧ Track arm

321‧‧‧Baffle

321a‧‧‧Outer flange

321b‧‧‧ concave edge

322‧‧‧ Track Team

3221‧‧‧ Tracks

3222‧‧‧end wheel

3223‧‧‧Internal tensioner

3224‧‧‧External tensioner

323‧‧‧second drive

324‧‧‧Connector

325‧‧‧Second linear actuator

33‧‧‧Climbing wheel assembly

331‧‧‧ rotating disk

332‧‧‧ Wheels

P‧‧‧ power source

Claims (15)

A mobile carrier comprising: a carrier body having a support frame and a carrier, the carrier being disposed at a top end of the support frame; a main support module having a drive wheel and a drive for driving the active a first driver and a driven wheel, wherein the driving wheel and the driven wheel are disposed on the supporting frame and respectively located at two ends of a center of gravity of the carrier body; and two auxiliary supporting modules respectively disposed on the supporting frame On the two sides, each of the auxiliary support modules includes a flip drive, a crawler arm and a climber wheel assembly, the flip drive is disposed on the support frame, the crawler arm is connected to the flip drive, and the climber wheel assembly is disposed on the crawler arm One end. The mobile carrier of claim 1, wherein the main support module comprises another driving wheel, and the two driving wheels are disposed on two sides of the supporting frame, and the driven wheel is disposed on the supporting In the middle of the other end of the rack. The mobile carrier of claim 1, wherein the first driver is a hub motor for integration into the interior of the driving wheel. The mobile carrier of claim 1, wherein the driving wheel is directly assembled to a support frame of the carrier body, the driven wheel being indirectly connected by a shock absorber and a first linear actuator Connected to the support frame of the carrier body. The mobile carrier of claim 4, wherein the two ends of the shock absorber are respectively connected to the support frame and the driven wheel, and the two ends of the first linear actuator are respectively connected to the support frame. And the shock absorber. The mobile carrier of claim 1, wherein the crawler arm comprises two parallel and spaced partitions, and a track set is disposed between the two partitions, the two partitions One of the outer sides of the first one is provided with a second drive for connecting and driving Moving the track set; the track arm further comprises a connector and a second linear actuator, one end of the connector is connected to the output end of the flip drive, and the other end is connected to one of the two partitions; One end of the two linear actuator is connected to the connector, and the other end is connected to one of the two partitions. The mobile carrier of claim 6, wherein each of the partitions has an opposite outer flange and an inner concave edge, and the outer edge of the track set protrudes beyond the outer portions of the two partitions. Flange. The mobile carrier of claim 6, wherein the connector is a shock absorber. The mobile carrier of claim 6, wherein the outer side of one of the two partitions is provided with a first connecting member, the connector connecting the first connecting member; the two partitions One of the outer sides is provided with a second connecting member, and the second linear actuator is connected to the second connecting member; the first connecting member is closer to the bending portion of the two partitions, and the second connecting member is Adjacent to the ends of the two partitions. The mobile carrier of claim 9, wherein the first connecting member and the second connecting member are disposed outside the same partition. The mobile carrier of claim 9, wherein the first connecting member, the second connecting member and the second driver are both disposed outside the same partition. The mobile carrier of claim 9, wherein the crawler arm is further provided with a partition outside the partition plate provided with the first connecting member and the second connecting member, the first connecting member and the first connecting member Both ends of the two connectors are respectively connected to the partition. The mobile carrier of claim 7, wherein the track set comprises a track and two end wheels abutting the track, an inner tensioning wheel and an outer tensioning wheel, the track set The outer edge of the track protrudes beyond the outer flanges of the two partitions, and the two end wheels, the inner tensioning wheel and the outer tensioning wheel are respectively rotatably disposed on the two partitions The two end wheels respectively abut the two ends of the inner circumferential surface of the track, and one of the two end wheels is connected to the second driver; the inner tensioning wheel abuts the track An inner circumferential surface of the crawler belt that is bent and adjacent to the outer flanges of the two partitions; the outer tensioning pulley and the crawler belt are in mesh with each other, and the crawler belt is bent and adjacent to the two partitions Inside the concave edge of the board. The mobile carrier of claim 13, wherein the ladder wheel assembly comprises a rotating disk and a plurality of wheels, the rotating disk has a central hole and a plurality of pivoting portions, the plurality of pivoting portions Is equiangularly distributed with respect to the central hole; the central hole of the rotating disk is connected to the output end of the second driver, the plurality of pivoting portions are respectively pivotally connected to the plurality of wheels; the ladder wheel assembly is disposed at the outermost side The outer side of the partition plate is coaxially connected to the rotating disk and the end wheel adjacent to the second connecting member by the output end of the second driver. The mobile carrier of claim 1, wherein the ladder wheel assembly comprises a rotating disk and a plurality of wheels, the rotating disk has a central hole and a plurality of pivoting portions, the plurality of pivoting portions The central hole of the rotating disk is connected to the output end of the second driver, and the plurality of pivoting portions are respectively pivotally connected to the plurality of wheels.