KR20150087081A - Cart and wheel control system applicable to the same - Google Patents

Abstract

The present invention provides a cart capable of improving user safety by assisting an elderly person who has trouble walking in walking. The cart according to an embodiment of the present invention comprises a frame unit, casters, a wheel locking unit, and a stopping unit. The frame unit connects a plurality of frames to form an outer skeleton. The casters are connected to a lower portion of the frames. The wheel locking unit comprises a grip unit connected to the frame unit. When the grip unit is pressed downwards, a wheel lock is unlocked to allow the casters to rotate. The stopping unit comprises a brake handle connected to the frame unit. When the brake handle is pulled upwards, rotation of the casters is suppressed.

Description

CART AND WHEEL CONTROL SYSTEM APPLICABLE TO THE SAME [

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cart and a wheel control system applied thereto, and more particularly to a cart capable of assisting the elderly or the like in walking and a wheel control system applied thereto.

Conventional pedometer for the elderly is presented as a structure that can be held and rested in a walking posture, which is inconvenient for the elderly.

Elderly people with uncomfortable walking require a walking aids with additional functions, such as being able to sit back and sometimes to load things, beyond simple functions to assist walking. Applicant research has shown that elderly people, particularly in agriculture, prefer walking aids with greater loads than those that provide chairs as needed.

Existing conventional pedestrian devices do not satisfy the needs of such consumers.

People in farming and fishing villages are increasingly aging, and they have musculoskeletal disorders and have discomfort in legs and knees. Also, considering the labor-intensive rural and rural environment, it is becoming more important to secure mobility through walking and to move products.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a walking aiding device having a general versatility by allowing an appropriate loading space to be secured in addition to existing walking assistance functions to increase the transportability of objects and to implement various additional functions. In addition, it provides a cart that can greatly enhance the safety of the user in terms of functions that assist the elderly with uncomfortable walking.

Other objects and advantages of the present invention will become apparent to those skilled in the art from the following detailed description.

In order to solve such a problem, according to an exemplary embodiment of the present invention,

A cart according to an exemplary embodiment of the present invention includes a frame portion, rolling wheels, a wheel lock portion, and a stop portion. The frame part forms a plurality of frames to form an exoskeleton. The rolling wheels are connected to the lower portion of the frame. The wheel lock portion includes a grip portion connected to the frame portion, and when the grip portion is pressed downward, the wheel is unlocked so that the rolling wheels can rotate. The stop includes a brake handle connected to the frame portion and restrains rotation of the rolling wheels when the brake handle is pulled upward.

Preferably, the brake handle may be disposed below the grip portion.

Further, the grip portion is elastically lifted toward the upper portion, and when pressed, can be formed horizontally on the ground.

For example, the grip portion includes a first grip portion corresponding to the left hand and a second grip portion corresponding to the right hand, and the brake handle includes a first brake handle corresponding to the left hand and a second brake corresponding to the right hand, Handles.

Further, the grip portion may further include a grip portion connecting bar connecting the first grip portion and the second grip portion, and the brake handle further includes a brake connection bar connecting the first brake handle and the second brake handle can do.

The wheel locking portion may include a locking portion mounted on the rolling wheel and elastically restricting rotation of the rolling wheel by pressing the rolling wheel, and a connecting portion connecting the holding portion and the locking portion, And a connection part for releasing the rotation inhibition of the rolling wheel by operating the locking part.

At this time, the locking portion may include a slider that is slidable upward and downward along the housing of the rolling wheel, and forms a slit formed obliquely in a direction away from the rolling wheel toward the downward direction, And a spring that elastically retracts the slider so as to lower the slider.

Alternatively, the rolling wheel includes a cushioning disk including a plurality of through holes and an elastic member connecting the cushioning disk to the outer frame of the rolling wheel,

Wherein the lock portion includes a slider slidable upward and downward along the housing of the rolling wheel and forming a slant formed obliquely in a direction away from the rolling wheel toward the downward direction, And a brake pin which is caught in or removed from the through hole of the buffer disk in accordance with the descent, and a spring that elastically retracts the slider to descend.

Meanwhile, the frame may be formed to be adjustable in length so as to adjust the height of the grip portion and the brake handle from the ground.

The cart may further include a conversion unit installed at the frame unit, the conversion unit changing one side of the cart into a chair shape or a basket shape.

At this time, the conversion unit may be formed as a box-shaped flexible sheet, and a pad may be formed at the front end or the rear end of the flexible sheet so as to form a chair by folding toward the bottom of the box.

At this time, the cart may further include a pad which is installed in the frame part, forms a floor that can be seated in the frame part when it is unfolded, and serves as an inlet for carrying the object when folded.

The cart may further include a carrier which is made of a flexible sheet and is formed under the pad to carry the object.

Meanwhile, the frame portion may be formed to be foldable.

The wheel control system according to the exemplary embodiment of the present invention includes a wheel lock portion for allowing the rolling wheels to rotate when the grip portion is depressed downward and a brake handle disposed under the wheel lock portion And a stop portion for restricting rotation of the rolling wheels when the brake handle is pulled upward.

At this time, the grip portion is elastically lifted toward the upper portion, and when pressed, it can be formed horizontally on the ground.

Further, the grip portion includes a first grip portion corresponding to the left hand and a second grip portion corresponding to the right hand, and the brake handle includes a first brake handle corresponding to the left hand and a second brake corresponding to the right hand, Handles.

Further, the grip portion may further include a grip portion connecting bar connecting the first grip portion and the second grip portion, and the brake handle further includes a brake connection bar connecting the first brake handle and the second brake handle can do.

The wheel locking portion may include a locking portion mounted on the rolling wheel and elastically restricting rotation of the rolling wheel by pressing the rolling wheel, and a connecting portion connecting the holding portion and the locking portion, And a connection part for releasing the rotation inhibition of the rolling wheel by operating the locking part.

At this time, the lock portion is slidable upward and downward along the housing of the rolling wheel, and forms a slant formed obliquely in a direction gradually moving away from the rolling wheel toward the downward direction. A brake pin gripped by the slot of the slider and being caught or released between spokes of the rolling wheel in accordance with the rising and falling of the slider, and a spring for elastically pulling the slider to descend.

According to the embodiment of the present invention, since the conversion unit can be utilized as a chair while providing a large loading capacity, it can be used as a chair or a large cargo depending on the user's needs.

In addition, the wheel control system can greatly enhance safety while increasing ease of use.

The effects of the present invention will be clearly understood and understood by those skilled in the art, either through the specific details described below, or during the course of practicing the present invention.

1 is a perspective view of a cart according to an exemplary embodiment of the present invention.
FIG. 2 is a perspective view showing a frame unit and a conversion unit according to the embodiment shown in FIG. 1; FIG.
3 is a side view of the handle portion employed in the embodiment shown in Fig.
4 is a side view of a rolling wheel and locking portion employed in the embodiment shown in Fig.
5 is a perspective view showing the use state of the conversion unit employed in the embodiment shown in FIG.
6 is a perspective view of a cart according to another exemplary embodiment of the present invention.
7 is a side view of a rolling wheel and locking portion applied to a cart according to another exemplary embodiment of the present invention.
8 is a perspective view of the cushioning disk shown in Fig.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the configuration, functions, and functions of a cart according to the present invention will be described with reference to the accompanying drawings. It should be noted, however, that the same reference numerals are used for the same or similar components throughout the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, therefore, are not to be construed as limiting the technical spirit of the invention. It is to be understood that the invention is not to be limited by any of the details of the description to those skilled in the art from the standpoint of a person skilled in the art that any or all of the drawings shown in the drawings are not necessarily the shape,

FIG. 1 is a perspective view of a cart according to an exemplary embodiment of the present invention. FIG. 2 is a perspective view of a frame unit and a conversion unit according to the embodiment shown in FIG. 1, FIG. 4 is a side view of a rolling wheel and a locking part employed in the embodiment shown in FIG. 1, FIG. 5 is a perspective view showing a state of use of the conversion part employed in the embodiment shown in FIG. 1, to be.

 1 to 5, a cart 100 according to an embodiment of the present invention includes a frame part 1 and rolling wheels 2.

The frame portion 1 is formed by forming a plurality of frames to form an exoskeleton, and is made to withstand the load expected by the user and the weight of the cargo contained in the later-described side portions.

The frame portion 1 shown specifically includes a pair of front frames 11 extending in a frontward direction including a handle portion held by a user, a rear frame 12 extending rearward from the center of each front frame, A front end frame 13 connecting the frame 11 laterally and a rear end frame 14 connecting the both rear frames 12 laterally. In addition, it may further include an additional horizontal frame for more rigid connection between the front and rear frames.

The rear frame 12 is hinged in the middle of the front frame 11 and is rotatable. That is, the rear frames 12 are overlapped with the front frames 11, so that the cart 100 can be folded along the longitudinal direction. This can reduce the space occupied when not in use, thereby enhancing the convenience of storage.

A pair of the front frame 11 extending downward and a lower end of the rear frames 12 extending backward form a square on the ground. The angle at which the rear frame 12 is spread with respect to the front frame 11 is determined by a restraining member 15 connecting the lower end of the front frame 11 and the lower end of the rear frame 12. The restricting member 15 may be a cord member or a link member folded and unfolded.

In addition, the front frame 11 is adjustable in length in the longitudinal direction so as to adjust the height of the handle.

Specifically, the front frame 11 includes a first frame 111 having a larger diameter and a second frame 112 having a smaller diameter and having one end inserted into the first frame 111, And a fixing means 113 for temporarily fixing the second frame 112 slidably protruding from the first frame 111.

The fixing means 113 may be a bolt which is screwed to the side face of the first frame 111 and fastens and fixes the second frame 112 according to the rotation direction.

Since the length of the front frame 11 can be adjusted as described above, it is possible to realize a handle height suitable for the user's body.

The rolling wheels 2 are coupled to the lower ends of the front frames 11 and the lower ends of the rear frames 12, respectively. In this case, the rolling wheels 2 provided on the front frame 11 are constituted by casters, and they can freely rotate on the horizontal plane so that the traveling direction of the cart can be easily changed. The rolling wheels 2 connected to the rear frame 12 are provided with a stop portion 3 and a wheel lock portion 4 which will be described later.

The rolling wheel 2 preferably has a diameter of 15 centimeters or more. The large-sized rolling wheel 2 can smoothly be picked up in a rural environment with many unpaved roads, so that a user in the area can use the cart 100 smoothly.

A stop 3 is provided to prevent the rolling wheels from turning too fast and falling down on the downhill slope.

The stop portion 3 is actuated by a brake handle 31 provided on the handle, and restrains rotation of the rolling wheel 2.

Specifically, the stopper 3 includes a brake pad (not shown) disposed to be spaced apart from the rolling wheel, a clamp structure (not shown) for generating a braking force by contacting the brake pad with the rolling wheel, a brake handle (31) and a wire connecting the clamp structure. The configuration of the stopper 3 may be substantially the same as that of the wire brake used in bicycles and the like. The stopper 3 is operated by a hand-holding operation of the brake handle 31, so that the braking force can be adjusted according to the force of the grip.

Further, the cart 100 according to the exemplary embodiment of the present invention may further include a wheel lock portion 4 for locking or releasing rotation of at least one rolling wheel 2. The wheel lock portion 4 always suppresses the rotation of the rolling wheels 2 when a lock is set, such as a parking brake of an automobile.

The wheel lock portion 4 includes a grip portion 41, a lock portion 42, and a connection portion 43.

The grip portion 41 is a structure for the user to operate the wheel lock portion 4. [ The grip portion 41 is rotatably connected up and down at the end of the frame (front frame 11) forming the handle.

Concretely, one end of the rod constituting the gripper 41 is hinged to the end of the frame, and when it is lowered, it is substantially horizontal with the ground. When raised, it can be raised obliquely with respect to the ground.

Further, an elastic member (not shown) such as a coil spring is used at the hinge connecting portion of the grip portion 41 and the frame so that the grip portion 41 is sloped upward while the external force does not act.

On the other hand, the lock portion 42 is mounted on the rolling wheel 2 connected to the rear frame 12 and interferes with the rotation of the rolling wheel 2 elastically to suppress the rotation of the rolling wheel 2.

Specifically, the lock portion 42 includes a slider 421, a brake pin 423, and a spring 424.

The slider 421 is a member vertically slidable along the housing 22 of the rolling wheel. The slider 421 is formed with a slot 422 penetrating in the forward and backward directions. At this time, when viewed from the front, the long hole 422 is formed such that its upper portion is close to the rolling wheel 2 and its slanting away from the rolling wheel 2 toward the lower portion.

The slider 421 is coupled with a brake pin 423 held by the slot 422. The brake pin 423 horizontally passes through the housing 22 of the rolling wheel 2, so that only the movement to the left and right is forced. Accordingly, when the slider 421 is lowered or raised, the brake pin 423 gripped by the slot 422 moves toward or away from the rolling wheel. 4, when the slider 421 is lowered, the brake pin 423 pushed by the slot 422 toward the rolling wheel 2 is inserted between the spokes 21 of the rolling wheel 2 . Therefore, the rolling wheel 2 can not be arbitrarily rotated by the brake pin 423.

When the slider 421 is elevated, the brake pin 423 is moved laterally away from the rolling wheel 2 by the lower portion of the slot 422, and the brake pin 423 is prevented from interfering with the sprocket 21 So that the rolling wheel 2 can freely rotate.

A spring 424 for elastically pulling the slider 421 downward is provided at a lower portion of the slider 421. The spring 424 pulls the slider 421 downward so that the brake pin 423 is caught between the spokes 21 to put the rolling wheel 2 in the locked state .

The connecting portion 43 is a member for connecting the grip portion 41 and the lock portion 42.

When the grasping portion 41 is rotated to be substantially horizontal, the connecting portion 43 overcomes the elastic force of the spring 424 and raises the slider 421. Thereby releasing the lock state of the rolling wheel 2 by pushing the brake pin 423 sideways.

The connecting portion 43 transmits the pulling force of the grip portion to the lock portion, and can be a wire or the like piled up in the tube.

The lock portion 42 is elastically lowered by the force of the coil spring to the housing 22 to which the rolling wheel 2 is coupled and is locked A pad may be provided. In this case, when the external force is not applied, the lock pad (not shown) presses the rotating surface of the rolling wheel by the coil spring, so that the rolling wheel 2 is not rotated. By the pulling force transmitted through the connecting portion 43, the lock pad (not shown) is separated from the rolling wheel, and the rolling wheel is unlocked.

The wheel lock portion 4 is used when the user does not walk and prevents the cart 100 from moving regardless of the intention. Such a wheel lock portion 4 enhances the ease of use by restraining movement of the cart 100 while the cart 100 is used as a chair or loading a cargo.

The gripper portion 41 is lowered naturally while the cart 100 is held by the user's hand. That is, since the gripper 41 is used as a handle of the cart 100, it is possible to naturally release the locking of the rolling wheel 2 when the user uses the walking aid. More specifically, the grip portion 41 includes a first grip portion 41a corresponding to the left hand and a second grip portion 41b corresponding to the right hand.

Further, in a situation where the user removes the cart 100 for some reason, the grip portion 41 is naturally raised by the elastic member, and the lock portion 42 instantly locks the rolling wheel 2, ) Is suddenly moved, thereby preventing an accident that the user loses focus and falls.

On the other hand, the brake handle 31 includes a first brake handle 31a corresponding to the left hand and a second brake handle 31b corresponding to the right hand. In addition, the brake handle 31 can be disposed so as to be positioned below the lowered grip portion 41 so that the user can hold the grip portion 41 and the brake handle 31 in one hand. That is, when the user puts his / her hand on the grip portion 41 for pushing and pushing the cart 100, the brake handle 31 immediately apart from the brake handle 31 comes under the handle, so that the grip portion 41 and the brake handle 31 can be easily gripped. This is similar to that in which the position of the handle and the brake handle 31 is brought close to each other in a bicycle riding posture so that the brake handle 31 can be easily pulled out without excessive use of the wrist. Therefore, it is possible to naturally operate the wheel lock portion 4 and the stop portion 3 without affecting the wrist joint of the user.

1 to 2 and 5, the frame part 1 is provided with a conversion part 5 which can be used as a chair or a basket. The conversion section 5 is provided in the frame section 1.

The conversion unit 5 is made of a flexible material and can be partially changed. For example, the material of the conversion section 5 may be a sheet made of synthetic resin.

One of the forms of the conversion section 5 is a sheet woven in a box shape. In this box form, the front and both sides of the sheet can be fixed to the frame and fixed in position.

For example, in the form of a box, the upper end of the upper part is fixed to the front end frame 13, the upper end of the upper part is fixed to the front frame 11 and the rear frame 12, And is fixed to both of the rear frames 12.

As described above, the front end portion and the both side portions are fixed to the frame portion 1, so that the conversion portion 5 can be seated without departing from the frame portion 1. [

On the other hand, in the box-shaped conversion unit 5, the rear end portion 51 is not fixed to a separate frame, so that the rear end portion 51 forms a box when the rear end portion 51 is raised, So that it can be used as a chair.

That is, in a state in which it is erected on all the wall surfaces of the conversion unit 5, the shape of the box is opened to the upper side, so that a space for holding an object can be secured. The box-shaped conversion section 5 can be formed in a very large volume according to the planar area occupied by the cart 100. As a result, the volume of the object that can be loaded at one time is greatly increased.

On the other hand, the rear end portion of the box-shaped conversion portion 5 forming the rear wall is not fixed to any frame, so that the rear end portion 51 can be folded into contact with the inner bottom of the box. Since the rear end portion of the box is opened laterally as the rear end portion 51 is folded, the rear end portion of the box can be utilized as a chair for the user to sit on.

In a further configuration, the pad 52 may be coupled to the rear end 51 of the seat. The pad 52 may be made of a hard or gently curved material. The pad 52 can be formed to form a rear wall when the conversion section 5 is in the form of a box. Such a pad 52 prevents the shape of the rear wall from collapsing so that when the sheet is made of a relatively thin and strong cloth, the shape of the correct box can be maintained.

Further, when the pad 52 is pushed to the bottom of the box for use as a chair, it functions as a seat by forming a relatively hard floor as compared with the seat.

The pad 52 includes a cushion member such as a sponge or a rubber pad, and may have elasticity. This cushioned pad 52 adds comfort to further enhance the user's convenience.

The length of the pad 52 may be formed to be higher than the left and right wall surfaces of the seat in a box-shaped form. Such a long length of the pad 52 makes it possible to largely cover the bottom of the box when the pad 52 is placed in the box. By forming the pad 52 over a large area, it can be used as a chair in which an obese user can feel uncomfortable.

6 is a perspective view of a cart according to another exemplary embodiment of the present invention. The cart shown in Fig. 6 is substantially the same as the cart shown in Figs. 1 to 5 except for the shape of the grip portion of the wheel lock portion, the shape of the brake handle of the stop portion, and the shape of the pad. Accordingly, the same or similar components are denoted by the same reference numerals, and redundant description is omitted.

6, the grip portion 41 of the wheel lock portion 4 further includes a grip portion connecting bar 41c connecting the first grip portion 41a and the second grip portion 41b, The brake handle 31 further includes a brake connecting bar 31c connecting the first brake handle 31a and the second brake handle 31b. In the case where the grip portion connecting bar 41c and the brake connecting bar 31c are further included, the user can raise his / her hand to the central portion, thereby making it easier to use.

Also, unlike in the previous embodiment, the pad 6 on which the user can sit is directly disposed in the frame portion 1. [ The pad 6 includes, for example, a front pad 6a and a rear pad 6b. The front pad 6a is configured to be foldable forward, and the rear pad 6b is configured to fold backward do. Such a pad 6 forms a floor that can be seated in the frame portion when it is unfolded, and exposes an opening capable of carrying the object when folded. In the lower portion of the pad 6, the pad 6 is made of a flexible sheet and disposed on the lower portion of the pad 8 in which the object can be carried.

The frame portion 1 is further provided with a limit frame 7 to limit the extent to which the front frame 11 and the rear frame 12 are unfolded and also the front frame 11 and the rear frame 12 The center portion of the limiting frame 7 is hinged.

FIG. 7 is a side view of a rolling wheel and lock portion applied to a cart according to another exemplary embodiment of the present invention, and FIG. 8 is a perspective view of the cushioning disk shown in FIG.

7 and 8, the rolling wheel 2 in the present embodiment includes a cushioning disk 23 including a plurality of through holes h and a cushioning disk 23 at the outer periphery of the rolling wheel 2 And an elastic member 24 connected to the frame.

4, the brake pin 423 is inserted directly into the space between the spokes 21, but the brake pin 423 in this embodiment can not reach the space between the spokes 21, (H) of the through hole (23).

Therefore, at the moment when the user misses the grip portion 41 of the wheel lock portion 4 and the brake pin 423 is inserted into the through hole h to stop the cart, the cart does not suddenly stop, 24). Thus, it is possible not only to mitigate the impact transmitted to the user, but also to prevent the article put on the cart from being poured by inertia.

In the foregoing, the cart according to the exemplary embodiment of the present invention has been described. Further, a wheel control system that can be applied to a cart includes a wheel lock portion for allowing the rolling wheels to rotate when the grip portion is pressed downward, and a brake handle disposed below the wheel lock portion, And a stop for restricting rotation of the rolling wheels when the handle is pulled upward. Since the structure of the wheel lock portion and the stop portion has been described above, a detailed description will be omitted.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: Carrying cart
1: frame part
11: Front frame
111: first frame 112: second frame 113: fixing means
12: rear frame 13: front frame 14: rear frame 15:
2: rolling wheels 21: spokes 22: housing 23: buffer disk 24: elastic member
3: stop 31: brake handle
4: Wheel lock part
41: grip part 42: locking part 421: slider 422:
423: Brake pin 424: Spring 43:
5: conversion part 51: rear part 52: pad

Claims (20)

A frame part forming a plurality of frames to form an exoskeleton;
Rolling wheels connected to a lower portion of the frame;
A wheel lock portion that includes a grip portion connected to the frame portion and releases the lock of the wheel when the grip portion is pressed downward to allow the rolling wheels to rotate; And
And a stop for restricting rotation of the rolling wheels when the brake handle is pulled up.
The method according to claim 1,
And the brake handle is disposed below the grip portion.
The method according to claim 1,
Characterized in that the gripping portion is resiliently held upward and is formed horizontally on the ground when pressed.
The method according to claim 1,
Wherein the gripping portion includes a first grip portion corresponding to the left hand and a second grip portion corresponding to the right hand,
Wherein the brake handle comprises a first brake handle corresponding to the left hand and a second brake handle corresponding to the right hand.
5. The method of claim 4,
Wherein the gripping portion further comprises a grip portion connecting bar connecting the first grip portion and the second grip portion,
Wherein the brake handle further comprises a brake connecting bar connecting the first brake handle and the second brake handle.
The method according to claim 1,
The wheel lock portion includes:
A lock portion mounted on the rolling wheel and elastically pressing the rolling wheel to suppress rotation of the rolling wheel; And
Further comprising a connection portion connecting the grip portion and the lock portion and releasing the rotation of the rolling wheel by operating the lock portion as the grip portion is lowered.
The method according to claim 6,
The locking portion
A slider slidable upward and downward along the housing of the rolling wheel and forming a slant formed obliquely in a direction away from the rolling wheel in a downward direction;
A brake pin which is held by the slot of the slider and slips or slips in between spokes of the rolling wheel in accordance with the rising and falling of the slider; And
And a spring for elastically pulling the slider downward.
The method according to claim 6,
The rolling wheel includes a buffer disk including a plurality of through holes and an elastic member connecting the buffer disk to an outer frame of the rolling wheel,
The locking portion
A slider slidable upward and downward along the housing of the rolling wheel and forming a slant formed obliquely in a direction away from the rolling wheel in a downward direction;
A brake pin held by the slot of the slider and being caught or released between the through holes of the buffer disk according to the rising and falling of the slider; And
And a spring for elastically pulling the slider downward.
The method according to claim 1,
Wherein the frame is formed to be adjustable in length so as to adjust the height of the grip portion and the brake handle from the ground.
The method according to claim 1,
Further comprising a conversion unit installed in the frame unit, the conversion unit changing one side thereof into a chair shape or a basket shape.
11. The method of claim 10,
The conversion unit
A box-shaped flexible sheet,
Wherein a pad is formed at a front end or a rear end of the flexible sheet so as to form a chair by folding toward the bottom of the box.
The method according to claim 1,
Further comprising a pad provided on the frame portion to form a floor that can be seated in the frame portion when it is unfolded, and a pad to be an inlet for carrying the object when folded.
13. The method of claim 12,
Further comprising: a carrying case made of a flexible sheet and formed at a lower portion of the pad to carry the object.
The method according to claim 1,
Wherein the frame portion is formed so as to be foldable.
A wheel lock portion for releasing the wheel lock when the grip portion is pressed downward to allow the rolling wheels to rotate; And
And a stop for restricting the rotation of the rolling wheels when the brake handle is pulled up.
16. The method of claim 15,
Wherein the grip portion is elastically lifted toward the upper portion and is horizontally formed on the ground when being pressed.
16. The method of claim 15,
Wherein the gripping portion includes a first grip portion corresponding to the left hand and a second grip portion corresponding to the right hand,
Wherein the brake handle comprises a first brake handle corresponding to the left hand and a second brake handle corresponding to the right hand.
18. The method of claim 17,
Wherein the gripping portion further comprises a grip portion connecting bar connecting the first grip portion and the second grip portion,
Wherein the brake handle further comprises a brake connection bar connecting the first brake handle and the second brake handle.
18. The method of claim 17,
The wheel lock portion includes:
A lock portion mounted on the rolling wheel and elastically pressing the rolling wheel to suppress rotation of the rolling wheel; And
Further comprising a connection portion connecting the grip portion and the lock portion and releasing the rotation of the rolling wheel by operating the lock portion as the grip portion is lowered.
20. The method of claim 19,
The locking portion
A slider slidable upward and downward along the housing of the rolling wheel and forming a slant formed obliquely in a direction away from the rolling wheel in a downward direction;
A brake pin which is held by the slot of the slider and slips or slips in between spokes of the rolling wheel in accordance with the rising and falling of the slider; And
And a spring for elastically pulling the slider downward.

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