JP3216807U - Automatic length wheelbarrow - Google Patents

Abstract

An automatic length-variable type wheelbarrow capable of adjusting a cargo loading space in order to easily load a cargo having a large volume, particularly a heavy load. An automatic length-variable type wheelbarrow includes a first frame, a second frame and a third frame provided on one end and the other end of the first frame, and a first frame to a third frame. A guide unit 500 provided at a lower part of the frame and having a length adjusting unit 510 and an extension unit 520; and a pair of operating units 600 provided at the lower part of the second and third frames and operating the guide unit. The operation unit is operated, and the interval between the corresponding frame and the first frame is automatically adjusted. [Selection] Figure 4

Description

The present invention relates to an automatic length-variable wheelbarrow, and more particularly, to an automatic length-variable wheelbarrow capable of adjusting a cargo loading space in order to easily load a heavy load, particularly a heavy load. .

In general, a wheelbarrow is a transportation means that is used to conveniently transfer a heavy or bulky cargo for a person to hold by hand.

In addition, the wheelbarrow is manufactured in various forms mainly depending on the size and volume of the cargo to be loaded.

In particular, a wheelbarrow mainly used for transferring light cargo in a room is usually composed of handles composed of a horizontal frame and a vertical frame.

In such a wheelbarrow, after a cargo is mainly put in a box or a car, the box or the car is loaded on the upper part of the horizontal frame and moved.

However, when a conventional wheelbarrow is loaded with bulky cargo, the cargo loading space at the top of the horizontal frame is narrow and the cargo falls to the ground and is damaged, or part of the cargo is pulled to the ground. A point occurred. That is, there is a problem that the cargo is damaged.
In addition, the conventional wheelbarrow has a problem that it is not efficient because it has a small loading space, and it is difficult to transfer bulky goods, especially when there are many cargoes to be transferred, which must be transported in several times. It was.

Further, the conventional wheelbarrow is mainly used indoors, and there is a problem that the building is damaged when the corner of the wheelbarrow hits a wall.

Therefore, an automatic length-variable wheelbarrow capable of selectively expanding the cargo loading space and adjusting the degree of expansion is required.

Korean Registered Utility Model No. 20-0290212 (2002.1.11.)

The present invention has been made in view of the above-described problems, and an object thereof is to provide an automatic length variable handcart capable of easily adjusting a cargo loading space.

To achieve the above object, an embodiment of the present invention includes a first frame, a second frame and a third frame provided at one end and the other end of the first frame, and the first frame to the first frame, respectively. A guide portion provided at a lower portion of the third frame and having a length adjusting portion and an extension portion; a pair of operating portions provided at a lower portion of the second frame and the third frame for operating the guide portion; An automatic length-variable handcart is provided in which a distance between a corresponding frame and a first frame is automatically adjusted by operating the operating unit.

In one embodiment of the present invention, a rib may be provided at a lower portion of the first frame to the third frame, and a button hole may be further provided on the second frame and the third frame. Good.

In one embodiment of the present invention, the length adjusting unit includes a first rod inserted through both ends of the first frame and one end of the second frame and the third frame, and the first rod May be provided with a plurality of hole units at both ends.

In one embodiment of the present invention, the extension part is inserted through both ends of the first frame and one end of the second frame and the third frame, and a second rod provided outside the first rod; A spring provided inside the second rod, a pressure unit provided so as to be insertable into the second rod, one end fixed to the rib, and the other end fixed to one end of the spring. The spring may be compressed by a wall body provided inside the second rod and the pressure unit.

In one embodiment of the present invention, the operating unit includes a housing forming a body, a button unit extending at an upper end of the housing and having a size corresponding to the button hole, and an upper end of the housing. Guide grooves provided on both sides and formed to correspond to the shapes of the first rod and the second rod, and protruding above the guide grooves and having a size corresponding to the hole unit A unit, an elastic member inserted into and coupled to a groove provided in the lower portion of the housing, a lid unit coupled to the lower portion of the housing, and extended above the lid unit and inserted inside the elastic member And a separation preventing unit formed in a possible size.

In an embodiment of the present invention, a distance between the corresponding frame and the first frame may be adjusted according to a position where the protruding unit and the hole unit are coupled.

In one embodiment of the present invention, stoppers may be provided at both ends of the first rod and the second rod.

In one embodiment of the present invention, a guide rail provided at a lower portion of the first frame to the third frame and provided at a position corresponding to the first rod and the second rod may be provided.

In an embodiment of the present invention, guide rollers may be provided at both corners of the second frame and the third frame.

In one embodiment of the present invention, an auxiliary wheel may be further provided at a central portion of the lower portion of the first frame.

According to an embodiment of the present invention, the first frame, the second frame, and the third frame are separated and extended in the respective longitudinal directions, and the space in which cargo can be loaded is expanded.

The automatic length-variable type wheelbarrow is convenient because the interval between the frames can be adjusted according to the volume of the cargo or the transfer route.

In addition, the operating part is provided with an elastic member, and it is easy to adjust the interval between the frames.
Moreover, the guide part can move each frame on a straight line.
Further, by providing guide rollers at both corners of the second frame and the third frame, cargo can be safely transferred. Specifically, when a corner of an automatic length-type wheelbarrow hits a wall during the process of moving cargo in a building, the guide roller acts as a buffer to prevent the building or wheelbarrow from being damaged. it can.

Moreover, the guide part can strengthen the connection state between each frame, and can support so that the load by a cargo may be distributed uniformly to each frame. In addition, the guide part is a frame of the first frame to the third frame, so that it is stable even when heavy loads such as hemp bags, dies, and machine parts with bolts are loaded on each frame. Thus, each frame can be supported. That is, stable cargo transportation is possible.
Further, a spring is provided inside the rod located on the outside, and the second frame and the third frame can be moved conveniently.
Moreover, the auxiliary | assistant wheel is selectively provided in the lower part of the 1st flame | frame, and when carrying a heavy load cargo, the load added to a 1st flame | frame can be disperse | distributed.

The effects of the present invention are not limited to the effects described above, but should be understood to include all effects that can be inferred from the detailed description of the present invention or the configuration of the invention described in the scope of utility model registration. I must.

1 is a perspective view of an automatic length variable handcart according to an embodiment of the present invention. 1 is a perspective view illustrating a state in which an automatic length-variable handcart according to an embodiment of the present invention is extended. It is a perspective view which shows the structure of the lower part of the automatic length variable type handcart which concerns on one Example of this invention. It is a perspective view which shows the structure of the lower part of the automatic length variable type handcart which concerns on one Example of this invention in the extended state. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view schematically showing an operation of an extension according to an embodiment of the present invention, wherein (a) is a perspective view schematically showing an extension in a state where an automatic length-variable wheelbarrow is not extended. It is a figure and (b) is a perspective view which shows roughly the extension part of the state by which the automatic length variable type handcart was extended. It is a disassembled perspective view of the action | operation part which concerns on one Example of this invention. FIG. 6 is a perspective view showing an automatic length-variable handcart in which auxiliary wheels are further provided at a lower portion of a first frame according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. In the drawings, in order to clearly describe the present invention, portions not related to the description are omitted, and similar portions are denoted by similar reference numerals throughout the specification.

Throughout the specification, a part is “connected” to another part not only when it is “directly connected” but also “indirectly connected” through another member in the middle. "Is included. Further, “including” a component having a certain part does not exclude other components unless otherwise specified, and means that other components may be further provided.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view of an automatic length-variable handcart according to an embodiment of the present invention, and FIG. 2 illustrates an extended state of an automatic length-variable handcart according to an embodiment of the present invention. It is a perspective view shown.
As illustrated in FIGS. 1 and 2, the automatic length-variable handcart 1000 includes a first frame 100, a second frame 200, a third frame 300, a guide unit 500, and an operation unit 600.

A second frame 200 and a third frame 300 are provided at one end and the other end of the first frame 100, respectively, and cargo is placed on the top surfaces of the first frame 100, the second frame 200, and the third frame 300. Loaded.

Two wheels 400 are provided symmetrically under the second frame 200 and the third frame 300, respectively. At this time, the number of wheels 400 is not limited to this embodiment.

The guide unit 500 is provided below the first frame 100, the second frame 200, and the third frame 300, and includes a length adjustment unit 510 and an extension unit 520.

In addition, the operation unit 600 is provided below the second frame 200 and the third frame 300, and the interval between the corresponding frame and the first frame 100 is adjusted by the operation of the operation unit 600.

Specifically, when the operation part 600 at the lower part of the second frame 200 is operated, the distance between the corresponding second frame 200 and the first frame 100 is adjusted, and the operation part 600 at the lower part of the third frame 300 is adjusted. Is operated, the interval between the corresponding third frame 300 and the first frame 100 is adjusted.

Hereinafter, each configuration of the automatic length-variable handcart 1000 will be described more specifically.
A slip prevention unit 30 is formed on the top surfaces of the first frame 100 to the third frame 300. Here, the anti-slip unit 30 has a protrusion shape, and more preferably, a protrusion made of a material having a large frictional force may be formed.

In addition, the automatic length-variable handcart 1000 is further provided with a transfer through-hole 120 that is formed through and spaced from the both side surfaces of the first frame 100 by a predetermined interval, and the second frame and the third frame. The frame may further be provided with a transfer through-hole 120 spaced from the one side surface by a predetermined interval. At this time, the transfer through-holes 120 are all included in one embodiment as long as they have a size and shape that allow human hands to enter. Thus, when the through-hole 120 for transfer is used, the automatic length variable type handcart 1000 can be easily transported even in a place with a step.

Further, guide rollers 50 may be further provided at both corners of the second frame 200 and the third frame 300. The guide roller 50 can prevent the second frame 200 from colliding with the inner wall of the building during the movement and damaging the building.

Although not shown, an impact absorbing member (not shown) such as a sponge is used instead of the guide roller 50 in order to receive the impact of the corners of the second frame 200 and the third frame 300 hitting the inner wall of the building. It may be provided.

Moreover, when the through-hole 120 for transfer and the guide roller 50 are used, the automatic length variable type handcart 1000 can be transported simply and conveniently. Specifically, when the operator puts his hand into the transfer through hole 120 and carries the automatic length-variable handcart 1000, the guide roller 50 can be brought into contact with the floor surface. In other words, the operator can carry the vehicle conveniently by pushing the automatic length variable handcart 1000 through the guide roller 50 while moving.

FIG. 3 is a perspective view illustrating a configuration of a lower portion of the automatic length-variable wheelbarrow according to an embodiment of the present invention. FIG. 4 illustrates an automatic length according to an embodiment of the present invention in an extended state. It is a perspective view which shows the structure of the lower part of a variable handcart.

As shown in FIGS. 3 and 4, ribs 110 are provided in the lower portions of the first frame 100, the second frame 200, and the third frame 300. Specifically, a plurality of ribs 110 may be formed in the horizontal and vertical directions below the first frame 100 to the third frame 300.

The ribs 110 are all included in one embodiment as long as the load applied to the first frame 100 to the third frame 300 is uniformly distributed over the entire frame. The rib 110 configured as described above can support each frame so that heavy cargo can be safely loaded.

A button hole 625 is formed in the second frame 200 and the third frame 300. Details of the buttonhole 625 will be described later.
Meanwhile, the guide unit 500 includes a length adjustment unit 510 and an extension unit 520.

The length adjusting unit 510 includes a first rod 511. The first rod 511 is inserted through both ends of the first frame 100 and one end of the second frame 200 and the third frame 300, so that the first frame By supporting 100 to the third frame 300, the second frame 200 and the third frame 300 can be moved in a straight line.

Referring to FIG. 4A, a plurality of hole units 516 are provided at both ends of the first rod 511. At this time, the interval between the respective hole units 516 may be formed in consideration of the interval at which each frame is extended.

In one embodiment, the length adjusters 510 form a pair, but the position and number of the length adjusters 510 are not limited to one embodiment.

Hereinafter, the extension portion 520 will be described with reference to FIG.
FIG. 5 is a perspective view schematically illustrating the operation of the extension according to an embodiment of the present invention.
As shown in FIG. 5, the extension 520 includes a second rod 521, a spring 523, and a pressure unit 526.

The second rod 521 is inserted through both ends of the first frame 100 and one ends of the second frame 200 and the third frame 300, and supports the first frame 100 to the third frame 300, thereby supporting the second frame 200 and the second frame 300. The three frames 300 can be moved in a straight line.

A pair of wall bodies 528 to which one end of the spring 523 is fixed are formed inside the second rod 521. In one embodiment, the position of the wall body 528 corresponds to both ends of the first frame 100, but the position of the wall body 528 is not limited to this, and the position where the elastic force of the spring 523 is sufficiently maintained. All are included in one embodiment.

The spring 523 is provided inside the second rod 521, one end of the spring 523 is fixed to the pressurizing unit 526, and the other end is fixed to a wall body 528 provided inside the second rod 521. A pair of springs 523 is provided on one second rod 521.

At this time, the spring 523 maintains a compressed state even when the automatic length-variable handcart 1000 is extended to the maximum.
The pressure unit 526 is formed in a size that can be inserted into the second rod 521. At this time, one end of the pressure unit 526 is fixed to the rib 110 located on one end side of the second rod 521, and the spring 523 is fixed to the other end.

Meanwhile, the lengths of the first rod 511 and the second rod 521 are set in the longitudinal direction of each frame so that the first frame 100, the second frame 200, and the third frame 300 can be sufficiently supported. Only extended.
The guide rail 540 is provided at the lower part of the first frame 100 to the third frame 300, but is provided at a position corresponding to the first rod 511 and the second rod 521, and the first rods 511 and 512 are already set. Can help to avoid leaving.

In addition, stoppers 530 are further provided at both ends of the first rod 511 and the second rod 521, and the interval between the first frame 100 and the second frame 200, or the first frame 100 and the third frame 300 is set in advance. They can be separated by an interval. Specifically, when the protruding unit 614 is inserted into the hole unit 516 located on the outermost side of the first rod 511, the stopper 530 is hooked on one end of the rib 110 so that the first rod 511 and the second rod 521 are hooked. It protrudes on the outer surface of the.

The stopper 530 configured as described above is used when the distance between the first frame 100 and the second frame 200 or the distance between the first frame 100 and the third frame 300 is extended by the operating unit 600. The second frame 200 and the third frame 300 can be assisted so as not to be detached from the guide unit 500.

Further, the first rod 511 and the second rod 521 have a fixing hole 513 formed at the center in the longitudinal direction, and a fixing unit 535 is further provided on the rib 110 provided at a position corresponding to the fixing hole 513 to fix The hole 513 and the fixing unit 535 are coupled and fixed to each other. That is, the first rod 511 and the second rod 521 are fixed to the first frame 100, and slide with the second frame 200 and the third frame 300 by the operation of the operation unit 600.

More specifically, FIG. 5A is a perspective view schematically showing an extension portion in a state where the automatic length-variable wheelbarrow is not extended, and FIG. 5B is an automatic length diagram. It is a perspective view which shows roughly the extension part in the state where the variable type handcart was extended.

As shown in FIG. 5A, the spring 523 maintains a compressed state by the pressurizing unit 526 and the wall body 528 when the automatic length-variable handcart 1000 is not extended.
As shown in FIG. 5B, when the automatic length-variable handcart 1000 is extended, the spring 523 pushes the pressure unit 526 and pushes the frame to which the pressure unit 526 is fixed. It is pulled while.

Further, the guide unit 500 configured as described above reinforces the connection state between the frames so that the load due to the cargo is evenly distributed to the frames. In addition, the guide unit 500 can increase the weight of the cargo that can be loaded on the automatic length-variable handcart 1000 by forming the framework of the first frame 100 to the third frame 300. That is, even when heavy cargo such as hemp bags, dies, and machine parts loaded with bolts is loaded on the first frame 100 to the third frame 300, the automatic length variable handcart 1000 can be stably provided. The cargo can be transported by.

FIG. 6 is an exploded perspective view of an operation unit according to an embodiment of the present invention.
As shown in FIG. 6, the operation unit 600 is provided in the second frame 200 and the third frame 300, and includes a housing 610, a button unit 620, a guide groove 612, a protruding unit 614, an elastic member 630, a lid unit 640, and a detachment. A prevention unit 645;

Hereinafter, each structure of the action | operation part 600 is demonstrated concretely.
The housing 610 forms a body of the operation unit 600.
The button unit 620 extends at the upper end of the housing 610 and is formed in a size corresponding to the button hole 625. That is, the button unit 620 is formed to be insertable into the button hole 625. Preferably, the button unit 620 is provided so as not to protrude from the upper surface of the frame when the button unit 620 is inserted into the button hole 625.

Although not shown, a seal portion (not shown) is further provided in the space between the button unit 620 and the button hole 625 so that foreign matter does not flow into the space between the button unit 620 and the button hole 625. It is done. At this time, the seal portion may be made of a sponge-like material so that the movement of the button unit 620 is not hindered.

The guide grooves 612 are provided on both sides of the upper end of the housing 610 and are formed corresponding to the shape of the first rod 511. More specifically, the guide groove 612 is provided so as to contact the surface of the first rod 511 when the protruding unit 614 is inserted and fixed to the hole unit 516.

The protruding unit 614 protrudes above the guide groove 612 and has a size corresponding to the hole unit 516. That is, the protruding unit 614 is inserted and fixed in the hall unit 516.

The elastic member 630 is inserted and coupled to a groove (not shown) provided in the lower portion of the housing 610. At this time, the groove provided in the lower portion of the housing 610 may be formed in a size and shape corresponding to the outer diameter of the elastic member 630 so that only the vertical movement is possible when the elastic member 630 is inserted. Good. At this time, one or more elastic members 630 may be provided, and the grooves provided in the lower portion of the housing 610 are provided in the same number as the elastic members 630.

The lid unit 640 is coupled to the lower part of the housing 610 and can protect the inside of the operation unit 600.

The detachment prevention unit 645 extends above the lid unit 640, but is sized to be inserted into the elastic member 630. That is, the detachment prevention unit 645 can protect the lower end of the elastic member 630 from being detached in the lateral direction.

In summary, the upper end of the elastic member 630 is in contact with the groove provided in the lower portion of the housing 610, and the lower end of the elastic member 630 is provided in contact with the upper surface of the lid unit 640. At this time, the elastic member 630 may be in a compressed state.

Hereinafter, a process of adjusting the distance between the first frame 100 and the second frame 200 using the operation unit 600 will be described.
First, when the button unit 620 is pressed on the upper surface of the second frame 200, the housing 610 is lowered together with the button unit 620 and the protruding unit 614 is detached from the hole unit 516.

Next, the second frame 200 is pushed out while the spring 523 is pulled by the restoring force, whereby the interval between the first frame 100 and the second frame 200 is separated. That is, the second frame 200 is automatically extended by the spring 523.

Next, the projecting unit 614 and the first rod 511 slide while the second frame 200 moves, and the projecting unit 614 is inserted and fixed to the hole unit 516 with a click feeling during sliding.

Further, the button unit 620 is moved to a position before being pressed by the restoring force of the elastic member 630 at the same time when the protruding unit 614 is inserted into the hole unit 516.
That is, when the button unit 620 is pressed, the second frame 200 is automatically extended away from the first frame 100.

In addition, when three or more hole units 516 are formed, the position where the protruding unit 614 and the hole unit 516 are coupled is changed according to the number of times the button unit 620 is pressed, and the first frame 100 and the second frame 200 are changed. The interval between them is adjusted in various ways.

Through such a process, the distance between the first frame 100 and the second frame 200 and the distance between the first frame 100 and the third frame 300 of the automatic length-variable wheelbarrow 1000 are easily adjusted. The

The automatic length-variable handcart 1000 configured as described above is convenient because the length can be easily adjusted according to the volume of the cargo to be loaded.
FIG. 7 is a perspective view illustrating an automatic length-variable handcart in which auxiliary wheels are further provided at a lower portion of a first frame according to another embodiment of the present invention.

As shown in FIG. 7, wheels may be further provided at the lower portion of the first frame 100. At this time, the number and shape of the wheels are not limited to one embodiment, and may be embodied in various forms.
As an example, auxiliary wheels 450 may be further provided in the central portion of the lower portion of the first frame 100. At this time, the auxiliary wheel 450 may be smaller in size than the wheel 400. Specifically, the auxiliary wheel 450 is configured not to touch the floor surface when a general weight of cargo is loaded on the first frame 100. However, when the automatic length-variable handcart 1000 is used in an extended form, if the weight of the cargo loaded on the first frame 100 is heavy, the first frame 100 may be deformed. At this time, when the first frame 100 is deformed, the auxiliary wheel 450 comes into contact with the floor surface. That is, the auxiliary wheel 450 can distribute the load of the cargo loaded on the first frame 100 and stably carry and carry the cargo.

Alternatively, the pair of wheels 400 are provided in the lower part of the first frame 100, but may be positioned in a straight line with the wheels 400 provided in the second frame 200 and the third frame 300.

Although not shown, a handle frame (not shown) may be provided on one side of the upper surface of the second frame 200 or the third frame 300. Specifically, the handle frame is extended above the second frame 200 or the third frame 300, and has a rigidity that does not damage even if the automatic length variable wheelbarrow 1000 loaded with cargo is pushed or pulled. It is preferable to have it. At this time, any shape that can easily move the automatic length-variable handcart 1000 by a person is included in one embodiment.

The above description of the present invention is for illustrative purposes, and a person having ordinary knowledge in the technical field to which the present invention belongs does not depart from the technical idea and essential features of the present invention. It will be understood that it can be easily transformed into other specific forms. For this reason, it should be understood that the above-described embodiments are illustrative in all aspects and not limiting. For example, each component described as a single type can be implemented in a distributed manner, and components described as being similarly distributed can be implemented in a combined form.

The scope of the present invention is indicated by the claims for utility model registration described below. The meaning and scope of the claims for utility model registration, and all modified or modified forms derived from the equivalent concept thereof, It should be interpreted as being included in the scope.

30 Anti-slip unit 50 Guide roller 100 First frame 110 Rib 120 Transfer through hole 200 Second frame 300 Third frame 400 Wheel 450 Auxiliary wheel 500 Guide portion 510 Length adjusting portion 513 Fixing hole 516 Hall unit 520 Extension portion 523 Spring 526 Pressure unit 528 Wall body 530 Stopper 535 Fixed unit 540 Guide rail 600 Actuator 610 Housing 612 Guide groove 614 Projection unit 620 Button unit 625 Button member 630 Elastic member 640 Lid unit 645 Detachment prevention unit 1000 Automatic length variable handcart

Claims (10)

A first frame;
A second frame and a third frame respectively provided at one end and the other end of the first frame;
A guide portion provided at a lower portion of the first frame to the third frame and having a length adjusting portion and an extension portion;
A pair of operating parts that are provided at a lower part of the second frame and the third frame and operate the guide part,
The automatic length variable type handcart in which the interval between the corresponding frame and the first frame is automatically adjusted by operating the operation unit. 2. The automatic length according to claim 1, wherein a rib is provided at a lower portion of the first frame to the third frame, and a button hole is further provided on the second frame and the third frame. Variable wheelbarrow. The length adjusting unit includes a first rod that is inserted through both ends of the first frame and one end of the second frame and the third frame, and the first rod has a plurality of holes at both ends. The automatic length variable handcart according to claim 2, further comprising a unit. The extension is
A second rod that is inserted through both ends of the first frame and one end of the second frame and the third frame, and is provided outside the first rod;
A spring provided inside the second rod;
A pressurizing unit provided so as to be insertable into the second rod, having one end fixed to the rib and the other end fixed to one end of the spring;
The automatic length-variable handcart according to claim 3, wherein the spring is compressed by a wall provided inside the second rod and the pressure unit. The operating part is
A housing forming a fuselage;
A button unit extending to the upper end of the housing and formed in a size corresponding to the buttonhole;
Guide grooves provided on both sides of the upper end of the housing and formed corresponding to the shapes of the first rod and the second rod;
A protruding unit that is provided on the upper side of the guide groove and is formed in a size corresponding to the hole unit;
An elastic member inserted and coupled into a groove provided in a lower portion of the housing;
A lid unit coupled to a lower portion of the housing;
The automatic length variable handcart according to claim 4, further comprising: a separation preventing unit that extends above the lid unit and is formed to have a size that can be inserted inside the elastic member. . The automatic length-variable handcart according to claim 5, wherein a distance between the corresponding frame and the first frame is adjusted according to a position where the protruding unit and the hole unit are coupled. The automatic length-variable handcart according to claim 4, wherein stoppers are provided at both ends of the first rod and the second rod. 5. The automatic length variable according to claim 4, further comprising a guide rail provided at a lower portion of the first frame to the third frame and provided at a position corresponding to the first rod and the second rod. Type wheelbarrow. The automatic length variable handcart according to claim 1, wherein guide rollers are provided at both corners of the second frame and the third frame. The automatic length-variable handcart according to claim 1, further comprising an auxiliary wheel provided at a central portion of the lower portion of the first frame.