JP2020082826A - Transport vehicle - Google Patents

Abstract

To provide a transport vehicle, having auxiliary wheels restraining an inclination of a vehicle body, capable of restraining the auxiliary wheels from coming into contact with the ground to become obstacles during transportation.SOLUTION: The transport vehicle, having one or more wheels including a single front wheel or a single rear wheel, can touch the ground at three points including the one or more wheels, and includes: a vehicle body frame onto which the wheels are rotatably disposed; left and right handlebars for an operator to grip; a load-carrying platform provided above the vehicle body frame and used for a load to be placed; auxiliary wheels arranged on left and right sides of the one front wheel or the one rear wheel; and a height adjustment mechanism for adjusting a height from the ground surface of the auxiliary wheels.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a transport vehicle including auxiliary wheels that suppress the tilt of a vehicle body.

Known hand-held transport vehicles include three-wheeled vehicles with one front wheel and left and right rear wheels, and one-wheeled vehicles with grounding feet instead of the left and right rear wheels (for example, patents Reference 1).
This transport vehicle is provided with a body frame that holds a center of rotation of one front wheel, spreads to the left and right toward the rear, and has left and right rear wheels or feet below it.

The body frame is raised above the left and right rear wheels or the left and right feet, and the rear side is bent in a substantially horizontal direction as left and right handle parts that can be gripped by the left and right hands of an operator. ing.

Further, on the body frame, a loading platform for loading luggage is provided in front of the left and right handle portions.
Therefore, the operator can carry the luggage by gripping the left and right handle portions and pushing the transport vehicle with the luggage placed on the luggage carrier.

In addition, auxiliary wheels are arranged on both left and right sides of the front wheel. Therefore, with this auxiliary wheel, the left and right inclination of the carrier can be regulated at a predetermined position.

Chinese published patent publication CN105346573A

However, in the transport vehicle of Patent Document 1, when the wheels sink into the ground due to sandy ground or when there is unevenness on the ground, the auxiliary wheels hit the ground during transport, which causes resistance and increases the energy consumed to move the transport vehicle. The problem was that

In one aspect of the present disclosure, in a transport vehicle including an auxiliary wheel that suppresses a tilt of a vehicle body, it is desirable to prevent the auxiliary wheel from hitting the ground and causing resistance during transportation.

A carrier according to one aspect of the present disclosure is a carrier that has wheels including one front wheel or one rear wheel and can be grounded at three points including the wheels.
This carrier is provided with a body frame on which wheels are rotatably arranged, left and right handle portions arranged on the body frame, which can be gripped by an operator, and above the body frame, for loading luggage. And a luggage carrier. Auxiliary wheels are arranged on the left and right sides of one front wheel or one rear wheel, and a height adjusting mechanism for adjusting the height of the auxiliary wheel from the ground is also provided.

Therefore, according to the transport vehicle of the present disclosure, similarly to the above-described conventional transport vehicle, the operator grips the left and right handle portions in a state where the luggage is placed on the loading platform and pushes the transport vehicle, The luggage can be transported, and the auxiliary wheels can also prevent the transport vehicle from leaning greatly to the left and right.

In addition, the height adjustment mechanism allows the height of the auxiliary wheels to be adjusted from the ground, so that the operator can change the height of the auxiliary wheels according to the road surface condition, etc. It becomes possible to suppress that.

Therefore, it is possible to reduce wasteful energy consumed for moving the transport vehicle and improve workability during transport by the worker.
Here, since the auxiliary wheels are for hitting the road surface when the carrier is tilted and for restricting the lateral tilt of the carrier, it is necessary not to touch the ground when adjusting the height. Further, the height of the auxiliary wheel from the ground does not have to be higher than the rotation axis of the wheel on which the auxiliary wheel is arranged on the left and right (that is, one front wheel or one rear wheel).

Therefore, the height adjusting mechanism may be configured so that the auxiliary wheel does not touch the ground at the lowest adjustment height of the auxiliary wheel. Further, the height adjusting mechanism is configured such that the rotation axis of the auxiliary wheel is closer to the ground than the rotation axis of one front wheel or the one rear wheel at the maximum adjustment height of the auxiliary wheel. May be.

Further, the height adjusting mechanism may be configured such that the height of the auxiliary wheel from the ground can be adjusted stepwise. With this configuration, the height of the auxiliary wheel from the road surface can be changed stepwise according to the road surface condition. Further, as compared with the case where the auxiliary wheels can be adjusted steplessly, the auxiliary wheels can be firmly fixed, and it is possible to prevent the auxiliary wheels from hitting the road surface and changing the height.

On the other hand, the transport vehicle of the present disclosure may include a battery and a motor that rotates by receiving power from the battery, and at least one of the wheels may be a drive wheel that is rotationally driven by the motor. That is, the transport vehicle of the present disclosure may be a battery-driven electric transport vehicle.

In a battery-powered electric transport vehicle, if the auxiliary wheels hit the road surface and become a resistance when the transport vehicle moves, the power of the battery is wastefully consumed. Therefore, the battery power can be effectively used.

In this case, the drive wheel that is rotationally driven by the motor may be one front wheel.
Next, when the transport vehicle has one front wheel, the body frame is bent in a U shape so as to surround the front wheel from the front side in the traveling direction, and the rotation center portion of the front wheel can be rotated from both left and right sides. May be configured to support. Further, the left and right handle portions may extend rearward from the support portion where the vehicle body frame supports the front wheels.

Then, in this case, the auxiliary wheels may be arranged on both left and right sides of the front wheel via a mounting member mounted on a U-shaped portion in front of the traveling direction of the vehicle body frame. By doing this, the auxiliary wheels can be attached to and detached from the transport vehicle through the mounting member. Therefore, when the auxiliary wheels are not needed, the auxiliary wheels are removed, and when the auxiliary wheels are needed, the auxiliary wheels are attached. It becomes possible to improve the usability of the carrier.

Further, the height adjusting mechanism may be configured such that the auxiliary wheels arranged on both the left and right sides can independently adjust the height.
In this way, the height adjustment mechanism is provided for each of the left and right auxiliary wheels, so that the height adjustment mechanism does not hinder the rotation of the front wheel or the rear wheel arranged between the left and right auxiliary wheels. Since it is not necessary to configure the height adjusting mechanism, it is possible to simplify the configuration of the height adjusting mechanism.

Also, for example, when the left and right road surface heights of the carrier are different, the heights of the left and right auxiliary wheels can be adjusted to different heights according to the road surface height. Can be set more optimally according to the road surface condition.

It is a perspective view showing the composition of the main part of the electric vehicles of an embodiment. FIG. 2A is a perspective view showing a state in which a luggage carrier is attached to the electric transport vehicle shown in FIG. 1, FIG. 2A shows a condition in which a luggage carrier made of a pipe is attached, and FIG. 2B shows a state where a metal plate is press-formed. The state where the configured luggage carrier is attached is shown. FIG. 2B is a perspective view showing a state where auxiliary wheels are attached to the electric transport vehicle shown in FIG. 2A. It is a perspective view showing the composition of the whole auxiliary wheel with which an electric carrier is equipped. FIG. 5A is a front view of the mounting portion viewed from the front of the transportation vehicle, and FIG. 5B is a plan view of the mounting portion viewed from above the transportation vehicle. .. FIG. 6 is a three-sided view of the auxiliary wheel shown in FIG. 4, FIG. 6A is a front view of the auxiliary wheel, FIG. 6B is a plan view of the auxiliary wheel, and FIG. 6C is a side view of the auxiliary wheel. It is sectional drawing of the mounting part of the auxiliary wheel shown in FIG. 5A, FIG. 7A is a sectional view taken on the line VA-VA, FIG. 7B is a sectional view taken on the line VB-VB, FIG. 7C is a sectional view taken on the line VC-VC, and FIG. It is a VD line sectional view. 8A and 8B are explanatory views for explaining the height adjustment of the auxiliary wheel by the height adjustment mechanism, FIG. 8A is a perspective view when the height adjustment mechanism is in the locked state, and FIG. 8B is when the height adjustment mechanism is in the unlocked state. FIG. 9A and 9B are explanatory views for explaining the heights of the auxiliary wheels that can be switched by the height adjusting mechanism. FIG. 9A shows a state in which the auxiliary wheels are at the minimum height position, and FIG. 9B is an auxiliary wheel at an intermediate height position. FIG. 9C shows a state in which the auxiliary wheel is at the maximum height position.

Embodiments of the present disclosure will be described below with reference to the drawings.
As shown in FIG. 1, the electric transport vehicle 1 of the present embodiment is configured as a three-wheeled vehicle including one front wheel 3 which is a driving wheel and left and right rear wheels 5L and 5R which are driven wheels.

The subscript L for the rear wheel 5 indicates that it is arranged on the left side of the front of the electric transport vehicle 1, and the subscript R is arranged on the right side of the front of the electric transport vehicle 1. It means that. The same applies to the subscripts L and R added to the reference numerals in the following description.

The electric transport vehicle 1 includes a vehicle body frame 10 that rotatably supports the wheels 3, 5L, and 5R, and a luggage carrier frame 20 for fixing a luggage carrier on which the luggage is placed on the vehicle body frame 10.

The luggage carrier frame 20 is used for loading luggage such as a luggage carrier 20A configured by connecting a plurality of pipes as shown in FIG. 2A, or a luggage carrier 20B configured by press forming a steel plate as shown in FIG. 2B. It is configured to be able to fix various possible loading platforms. Therefore, the worker who carries out the transportation work can select the loading platform to be used according to the work content.

The vehicle body frame 10 and the luggage carrier frame 20 are made of a metal pipe material, and are formed by bending the pipes so as to be bilaterally symmetric with respect to the front wheel 3.
That is, the vehicle body frame 10 is bent in a U shape so as to surround the front wheel 3 from the front side in the traveling direction at the front end portion of the electric transport vehicle 1. Behind the bent U-shaped portion 10A, the front wheel support portions 11L and 11R (FIG. 1) that sandwich the rotation center portion of the front wheel 3 from the left and right and sandwich the motor 9 assembled to the rotation center portion of the front wheel 3 (FIG. 1). Indicates the left front wheel support portion 11L). Therefore, the front wheel 3 is rotatably fixed to the front wheel support portions 11L and 11R, and is rotationally driven by energizing the motor 9.

Further, in the vehicle body frame 10, rear portions from the front wheel support portions 11L and 11R are inclined portions 12L and 12R that spread laterally around the front wheel 3 and extend so as to rise obliquely upward.

Further, rearward of the inclined portions 12L and 12R, the mounting portions 13L and 13R are substantially horizontal and are used to mount the platform frame 20.
Between the left and right mounting portions 13L and 13R, a rear wheel frame 30 for mounting the platform frame 20 and supporting the left and right rear wheels 5L and 5R is provided.

The rear wheel frame 30 includes a frame main body 32 and a frame main body 32 for fixing the rear wheel support portions 7L and 7R to which the left and right rear wheels 5L and 5R are rotatably fixed, respectively so as to be slidable in the left and right directions. On the other hand, fixing members 34L and 34R for positioning and fixing the rear wheel support portions 7L and 7R are provided. Therefore, the operator can arbitrarily set the interval between the rear wheels 5L and 5R.

Further, in the vehicle body frame 10, behind the mounting portions 13L and 13R to which the rear wheel frame 30 is attached, there are inclined portions 14L and 14R that rise obliquely upward to a height position where the operator can manually push. There is. Further, behind the slanted portions 14L and 14R, the handle portions 16L and 16R are substantially horizontal, and grips 15L and 15R for the operator to grip are attached to the rear end side.

A brake device 17 that applies a braking force to the front wheels 3 is provided on the left front wheel support portion 11L of the vehicle body frame 10. A brake lever 18 for manually operating the brake device 17 is provided on the left handle portion 16L.

Further, in the vehicle body frame 10, the left and right mounting portions 13L and 13R for mounting the luggage carrier frame 20 are provided with illumination devices 40L and 40R for irradiating the front from both left and right sides of the electric transport vehicle 1, respectively. Has been. The illumination devices 40L and 40R are so-called LED lights including LEDs as light sources.

A fixed frame 19 for fixing the battery box 80 is provided between the inclined portions 14L and 14R of the vehicle body frame 10. The battery box 80 is capable of accommodating two battery packs, which are direct current power supplies, and receives electric power from one of the two battery packs to drive the motor 9 or turn on the lighting devices 40L and 40R. A control circuit board is provided.

The battery pack can also be used in other electric devices such as electric tools, and a mounting portion for removably mounting the battery pack is provided in the battery box 80.

Further, the battery box 80 is provided with a changeover switch for switching the battery, a display switch for displaying the remaining battery amount, and an operation panel provided with a display unit for the remaining battery amount. The fixed frame 19 is provided with the battery box 80 on the left and right handle portions with the operation panel facing upward so that the operator of the electric transport vehicle 1 can easily operate the switch of the operation panel and confirm the display content. It is configured to be arranged at the center of 16L and 16R.

Further, the handle 16R on the right side of the vehicle body frame 10 has a main power switch, a drive lever for instructing the driving of the motor 9, an upper limit of the rotation speed and a rotation direction when the motor 9 is driven (in other words, the upper and lower traveling speeds). The operating device 90 is provided with a setting unit for setting the traveling direction).

The control panel of the battery box 80 is connected to the operation panel of the battery box 80, the motor 9, the lighting devices 40L and 40R, and the operation device 90. In addition, a control circuit for driving and controlling the motor 9 and the lighting devices 40L and 40R according to a command from the operation panel or the operation device 90 is attached to the control circuit board.

Next, in the luggage carrier frame 20, the front end portion of the electric transport vehicle 1 is fixed to the front wheel support portions 11L and 11R of the vehicle body frame 10 by fixing members 21L and 21R (in FIG. 1, the left fixing member 21L is shown. ) Is rotatably fixed at a position below the center of rotation of the front wheel 3.

Further, the platform frame 20 is mounted on the vehicle body frame 10 and is mounted on the mounting portions 13L, 13R of the vehicle body frame 10 at a position higher than the front wheel 3 from the tip end portion fixed to the fixing members 21L, 21R. The connecting portions 22L and 22R are provided so as to rise in a substantially vertical direction to a possible height position.

The upper ends of the connecting portions 22L and 23R are bent substantially at right angles to the mounting portions 13L and 13R of the vehicle body frame 10 and can be mounted on the mounting portions 13L and 13R of the vehicle body frame 10. 23L and 23R.

The loading platform fixing portions 23L and 23R are erected straight up before the inclined portions 14L and 14R of the vehicle body frame 10, and the upper ends of the rising portions 24L and 24R have substantially the same height as the battery box 80. They are connected by the connecting portion 25 at the position.

In addition, between the rising portions 24L and 24R, a plate-like protective cover 26 is provided at a position lower than the connecting portion 25 at the upper end to prevent the loads placed on the cargo beds 20A and 20B from hitting the battery box 80. Is provided.

Further, since the carrier frame 20 is rotatably fixed around the front wheel 3 via the fixing members 21L and 21R, the operator lifts the connecting portion 25 at the upper end upward, and the carrier fixing portions 23L and 23R. It is possible to tilt the loading platform fixed to the front.

For this reason, the worker can drop the object to be transported in front of the electric carrier 1 as needed, but if the carrier frame 20 is not fixed to the vehicle body frame 10, the electric carrier 1 The carrier frame 20 may be vertically displaced during the movement of the.

Therefore, the fixed frame 19 to which the battery box 80 is fixed in the vehicle body frame 10 is engaged with the hook 27 provided on the rising portion 24L on the left side of the luggage carrier frame 20 to fix the luggage carrier frame 20. A member 28 is provided. The engagement member 28 is provided with an operation lever for the operator to manually engage/disengage.

According to the electric transport vehicle 1 of the present embodiment configured as described above, the motor 9 is in the free state when the main power switch or the drive lever of the operation device 90 is in the off state. Therefore, similarly to a general handcart, the worker can carry the luggage by himself by holding and pushing the left and right grips 15L and 15R.

When the operator holds the left and right grips 15L and 15R and pushes the electric transport vehicle 1 by hand, the operator turns on the main power switch of the operation device 90 and operates the drive lever to adjust the operation amount. Torque may be generated in the motor 9 to carry the load with a light force.

By the way, since the electric transport vehicle 1 according to the present embodiment has only one front wheel 3, when the electric transport vehicle 1 is moved, such as when transporting luggage, the vehicle body may be damaged by unevenness of the road surface or load balance of the luggage. May tilt left or right.

Therefore, in the electric transport vehicle 1 of the present embodiment, as shown in FIG. 3, auxiliary wheels 50L and 50R for restricting the inclination of the vehicle body can be arranged on both left and right sides of the front wheel 3.
As shown in FIG. 5, the auxiliary wheels 50</b>L and 50</b>R are attached to the U-shaped portion 10</b>A of the front end portion of the vehicle body frame 10 via the attachment member 60.

As shown in FIGS. 4 to 6, the attachment member 60 has an elongated shape that is longer than the length of the U-shaped portion 10A of the vehicle body frame 10 in the left-right direction, and the attachment wheels 50L and 50R are attached to the left and right ends of the attachment member main body. 62 is provided.

Then, the mounting member 60 sandwiches the U-shaped portion 10A of the vehicle body frame 10 between the mounting member main body 62 and the mounting plate 64 corresponding to the mounting member main body 62, and tightens a plurality of bolts 63 between these respective portions, whereby the vehicle body It is attached to the U-shaped portion 10A of the frame 10.

Disc-shaped fixing plates 66L and 66R are provided at both ends of the mounting member main body 62 as fixing portions of the auxiliary wheels 50L and 50R such that the plate surfaces are orthogonal to the longitudinal direction of the mounting member main body 62.

The auxiliary wheels 50L and 50R are mounted on the outer surface of the fixed plates 66L and 66R on the side opposite to the mounting member 60, and the rotation center shafts 51L and 51R of the auxiliary wheels 50L and 50R are connected to the front wheel 3 via fixing brackets 52L and 52R. It is attached so that it is parallel to the central axis of rotation.

The fixing fittings 52L and 52R are bent so that the supporting portions 53L and 53R that rotatably support the auxiliary wheels 50L and 50R are located outside the attaching portions 54L and 54R to the fixing plates 66L and 66R. ..

Further, the mounting portions 54L and 54R of the fixing metal fittings 52L and 52R to the fixing plates 66L and 66R have a disc shape corresponding to the fixing plates 66L and 66R, and the central portions of the discs are bolts 55L and 55R. Is fixed to the central portions of the fixing plates 66L and 66R via.

For this reason, when fixed to the left and right of the mounting member 60, the fixing metal fittings 52L and 52R can be rotated around the bolts 55L and 55R along the plate surfaces of the fixing plates 66L and 66R.
Since the support portions 53L and 53R of the auxiliary wheels 50L and 50R are bent from the mounting portions 54L and 54R, the rotation center shafts 51L and 51R of the auxiliary wheels 50L and 50R are eccentric from the center axes of the bolts 55L and 55R. It will be the position you did.

Therefore, the height of the auxiliary wheels 50L and 50R from the road surface can be changed by rotating the fixing fittings 52L and 52R about the bolts 55L and 55R. Then, in the electric transport vehicle 1 of the present embodiment, the heights of the auxiliary wheels 50L and 50R from the ground are switched to the heights H1, H2, and H3 shown in FIGS. 9A, 9B, and 9C in three stages, Height adjusting mechanisms 70L and 70R for fixing the auxiliary wheels 50L and 50R to the height positions thereof are provided.

The height adjusting mechanisms 70L and 70R are provided for the left and right auxiliary wheels 50L and 50R, respectively, but the left and right height adjusting mechanisms 70L and 70R have the same configuration. Therefore, in the following description, the configuration of the height adjusting mechanisms 70L and 70R will be described without adding the subscripts L and R.

As shown in FIG. 6C, in the mounting portions 54L and 54R of the fixing fittings 52L and 52R to which the auxiliary wheels 50L and 50R are mounted, the height adjustment mechanisms 70L and 70R are arc-shaped lengths centered on the bolts 55L and 55R. A hole 71 is provided.

A bolt 72 screwed into the fixing plates 66L and 66R of the mounting member 60 is inserted into the elongated hole 71. Therefore, by tightening the bolt 72, the fixing fittings 52L and 52R can be fixed to the fixing plates 66L and 66R so as not to rotate.

Further, by loosening the tightening of the bolt 72, the fixing metal fittings 52L, 52R can be rotated around the bolts 55L, 55R along the plate surfaces of the fixing plates 66L, 66R. The rotation range, in other words, the height adjustment range of the auxiliary wheels 50L and 50R is restricted by the length of the arc of the long hole 71.

Further, recesses 73 into which the fixing pins 74 provided on the fixing plates 66L and 66R of the mounting member 60 can be inserted are provided at three locations on the outer circumferences of the mounting portions 54L and 54R of the fixing fittings 52L and 52R.

The concave portion 73 is for positioning and fixing the turning positions of the fixing fittings 52L and 52R, in other words, the height positions of the auxiliary wheels 50L and 50R, by inserting the pin 74. ..

Then, in each recess 73, the heights of the auxiliary wheels 50L and 50R are the minimum height H1 and the intermediate height H2 shown in FIGS. 9A to 9C within the adjustment range regulated by the length of the arc of the elongated hole 71. The fixtures 52L and 52R are arranged so that the fixtures 52L and 52R can be fixed at the maximum height H3.

On the other hand, as shown in FIGS. 7A to 7D, on the fixing plates 66L and 66R of the mounting member 60, the link member 75 having the pin 74 attached to one end side is provided on the inner surface opposite to the fixing fittings 52L and 52R. It is provided. The link member 75 is rotatably fixed to the fixing plates 66L and 66R on the side opposite to the pin 74.

The link member 75 is fixed to the ribs 76 provided on the fixing plates 66L and 66R via the spring 78. The spring 78 urges the link member 75 toward the bolts 55L and 55R to bring the pin 74 into contact with the outer periphery of the fixing plates 66L and 66R.

Then, the pin 74 is brought into contact with the outer periphery of the fixing plates 66L and 66R at the position where the pin 74 is inserted into the recess 73 provided on the outer periphery of the mounting portions 54L and 54R of the fixing fittings 52L and 52R, A recess 79 is formed so that 74 can be positioned.

Therefore, the pin 74 is normally brought into contact with the outer periphery of the mounting portions 54L and 54R of the fixing fittings 52L and 52R by the biasing force of the spring 78. Therefore, the worker holds the auxiliary wheels 50L and 50R and rotates the fixing fittings 52L and 52H to insert the pin 74 into the recesses 73 of the fixing fittings 52L and 52R as shown in FIG. 8A. it can.

Further, as shown in FIG. 8B, the worker moves the pin 74 to the outside of the fixing plates 66L and 66R against the biasing force of the spring 78, and removes the pin 74 from the recess 73, thereby fixing the fixing metal fitting 52L. , 52R can be rotated, and the height of the auxiliary wheels 50L, 50R can be adjusted.

As described above, according to the electric transport vehicle 1 of the present embodiment, the height adjustment mechanisms 70L and 70R can adjust the heights of the auxiliary wheels 51L and 51R from the ground in three stages. Therefore, the worker can adjust the height of the auxiliary wheels according to the road surface condition and the like, and can prevent the auxiliary wheels 51L and 51R from hitting the ground and causing resistance during the transportation work. Therefore, it is possible to reduce wasteful energy consumed for moving the electric transport vehicle 1 and suppress power consumption of the battery.

Although the embodiments for implementing the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications can be implemented.
For example, in the above embodiment, the electric transport vehicle 1 including one front wheel 3 and two rear wheels 5L and 5R has been described, but an electric transport vehicle including two front wheels and one rear wheel may be used. ..

Further, in the above-described embodiment, an example in which all the three grounding points are wheels has been shown, but the remaining grounding portions other than one front wheel or one rear wheel may be the grounding feet.
Further, in the above-described embodiment, the example in which the auxiliary wheel is attached to the front wheel that is the driving wheel has been shown, but the front wheel may be a driven wheel and the rear wheel may be a driving wheel. In other words, if there are only one front wheel, the auxiliary wheels can be placed on the left and right of the front wheel regardless of whether the front wheel is the driving wheel or the driven wheel. Whether it is a driving wheel or a driven wheel, it may be arranged on the left and right of the rear wheel.

Further, in the above-described embodiment, the example of the electric transport vehicle in which the drive wheels are driven by the electric motor as the drive source has been described, but the technique of the present disclosure is applicable to a simple hand-driven transport vehicle without a drive source. It is possible to obtain the same effect as the above embodiment.

Further, in the above-described embodiment, the height adjustment mechanism is provided on each of the left and right auxiliary wheels, and the height of each auxiliary wheel can be adjusted individually. The height adjustment mechanism may be used for adjustment.

Further, in the above embodiment, the height adjusting mechanism has been described as being able to adjust the height of the auxiliary wheel in three steps, but it may be configured so that the height can be adjusted in four steps or more, or there is no adjustment. You may comprise so that it can adjust continuously in steps.

Further, a plurality of functions of one constituent element in the above-described embodiment may be realized by a plurality of constituent elements, or one function of one constituent element may be realized by a plurality of constituent elements. Further, a plurality of functions of a plurality of constituent elements may be realized by one constituent element, or one function realized by a plurality of constituent elements may be realized by one constituent element. Further, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above-described embodiment may be added or replaced with respect to the configuration of the other above-described embodiment.

DESCRIPTION OF SYMBOLS 1... Electric carrier, 3... Front wheels, 5L, 5R... Rear wheels, 9... Motor, 10... Body frame, 10A... U-shaped part, 16L, 16R... Handle part, 20A, 20B... Luggage bed, 50L, 50R... Auxiliary Wheels, 60... Mounting member, 70L, 70B... Height adjusting mechanism, 80... Battery box.

Claims (9)

A transport vehicle having wheels including one front wheel or one rear wheel, which can be grounded at three points including the wheels,
A body frame on which the wheels are rotatably arranged;
Left and right handle portions that are arranged on the body frame and can be gripped by an operator,
A loading platform provided above the vehicle body frame for loading luggage,
An auxiliary wheel disposed on the left and right sides of the one front wheel or the one rear wheel,
A height adjustment mechanism for adjusting the height of the auxiliary wheel from the ground,
Carrier equipped with. The transport vehicle according to claim 1, wherein the height adjustment mechanism is configured so that the auxiliary wheel does not touch the ground at the lowest adjustment height of the auxiliary wheel. The height adjustment mechanism is configured such that, at a maximum adjustment height of the auxiliary wheel, the rotation axis of the auxiliary wheel is closer to the ground than the rotation axis of the one front wheel or the one rear wheel. The transport vehicle according to claim 1 or 2, which is provided. The transport vehicle according to any one of claims 1 to 3, wherein the height adjusting mechanism is configured to be able to adjust the height of the auxiliary wheel from the ground in a stepwise manner. A battery,
A motor that receives power from the battery and rotates,
The transport vehicle according to any one of claims 1 to 4, wherein at least one of the wheels is a drive wheel that is rotationally driven by the motor. The transport vehicle according to claim 5, wherein the drive wheel is the one front wheel. With the one front wheel,
The body frame is bent in a U shape so as to surround the one front wheel from the front side in the traveling direction, and rotatably supports the center of rotation of the front wheel from both left and right sides,
The transport vehicle according to any one of claims 1 to 6, wherein the left and right handle portions extend rearward from a support portion where the vehicle body frame supports the front wheel. The transport vehicle according to claim 7, wherein the auxiliary wheels are arranged on both left and right sides of the front wheel via a mounting member that is mounted on a U-shaped portion in front of the body frame in the traveling direction. The transport vehicle according to any one of claims 1 to 8, wherein the height adjustment mechanism is configured such that the auxiliary wheels arranged on both the left and right sides can be independently adjusted in height.