KR101868747B1

KR101868747B1 - Stroller with changeable structure

Info

Publication number: KR101868747B1
Application number: KR1020170088064A
Authority: KR
Inventors: 윤유술; 박봉균; 정의경; 정해융
Original assignee: 엘지전자 주식회사
Priority date: 2017-07-11
Filing date: 2017-07-11
Publication date: 2018-06-19

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a baby carriage, and more particularly, to a baby carriage that can change its structure in accordance with a child's body development. The stroller according to an embodiment of the present invention includes a housing having an upper surface and a front surface, a cover hinged to the front surface of the housing and selectively opened and closed, and a moving module coupled to the lower portion of the housing.

Description

Stroller with changeable structure < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a baby carriage, and more particularly, to a baby carriage that can change its structure in accordance with a child's body development.

In recent years, low birth rate has raised the number of gold kids who are born as a single child, and the cost of investing in children is increasing.

In response, the size of the angel industry for infants aged 0 to 14 has been expanding, and a number of premium products targeting infants and toddlers are on the market.

Among them, baby strollers are a necessity for day care for infants under 5 years and are widely used in most families with infant children.

In this way, in addition to the characteristics of the baby stroller itself, which is essential for childcare, there has been a recent increase in the number of premium stroller cars with high prices due to an increase in the investment cost for Gold Kids. However, premium stroller products cost as little as 500,000 won and as much as 2,000,000 won, making it economically burdensome to purchase in ordinary households.

On the other hand, even if such a premium stroller is purchased, the baby stroller can no longer be used when the child grows due to the limited size of the stroller. Accordingly, a new stroller must be purchased in accordance with the growth of the child, which causes a problem that the cost of purchasing the stroller is very high.

An object of the present invention is to provide a stroller which can change its structure in accordance with the development of a child's body.

It is another object of the present invention to provide a baby carriage which is capable of attaching and detaching a seat.

It is another object of the present invention to provide a baby carriage which can adjust the angle of a seat.

It is another object of the present invention to provide a baby carriage to which a simple dining table is bound.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description and more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

The present invention can change the structure of the stroller according to the development of a child's body by providing a housing having a top surface and a front surface opened and a cover hinged to the front surface of the housing to selectively open and close.

In addition, the present invention can detach and attach a sheet by providing a detachable member on the bottom surface of the sheet and the inner bottom surface of the housing.

In addition, the present invention can adjust the angle of the seat by providing a lower seat which is detachable from the inner bottom surface of the housing and an upper seat which is hinged to the lower seat and rotates relative to the lower seat.

Further, according to the present invention, at least one pair of binding grooves is provided on the inner surface on both sides of the housing, so that the simple table can be bound.

The present invention can change the structure of the stroller according to the development of the child, so that the stroller can be prevented from being replaced even if the child grows, thereby saving the cost of purchasing a new stroller.

Further, according to the present invention, the seat provided on the baby carriage can be detached and attached, so that the seat can be easily replaced and cleaned, thereby improving the hygiene management efficiency.

Further, according to the present invention, by adjusting the angle of the seat provided on the baby carriage, an attitude suitable for the activity of the child can be derived.

In addition, the present invention binds a simple dining table to a baby carriage so that the baby carriage can be substituted for a dining table and a dining table without having to place the child on a separate dining table for a meal.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a baby carriage according to an embodiment of the present invention; Fig.
Figure 2 is a perspective view of the cover and housing shown in Figure 1;
Fig. 3 is a view showing a state in which the cover shown in Fig. 2 is selectively opened and closed at the front face of the housing; Fig.
Fig. 4 and Fig. 5 are views showing seating positions according to the opening and closing angles of the cover shown in Fig. 3, respectively. Fig.
Fig. 6 is a view showing fixing members provided on both side inner surfaces of the housing shown in Fig. 3 and both side ends of the cover. Fig.
Fig. 7 is a view showing a state where the cover is fixed to the housing through the fixing member shown in Fig. 6; Fig.
8 is a view showing a sheet which is detachably attached to the inner bottom surface of the housing;
9 is a view showing an upper sheet pivoting relative to a lower sheet;
Figs. 10 to 12 are views showing the seating postures according to the rotation angles of the seat shown in Fig. 9, respectively. Fig.
13 is a view showing a pair of binding grooves provided on both inner side surfaces of the housing.
14 is a view showing a state in which a plate is drawn in and out of a pair of binding grooves shown in Fig.
Fig. 15 is a view showing the seating position when the plate shown in Fig. 14 is retracted. Fig.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar elements.

FIG. 2 is a perspective view of a cover and a housing shown in FIG. 1; FIG. 3 is a view showing a cover selectively opened and closed at the front of the housing; Fig. Figs. 4 and 5 are views showing seating positions according to the opening and closing angles of the cover shown in Fig. 3, respectively.

Hereinafter, the baby carriage 1 according to the embodiment of the present invention and the constituent elements thereof will be described in detail with reference to FIGS. 1 to 5. FIG.

Referring to FIG. 1, a stroller 1 according to an embodiment of the present invention may include a housing 10, a cover 20, a seat 30, and a moving module 40. The stroller 1 shown in Fig. 1 is according to one embodiment, and its components are not limited to the embodiment shown in Fig. 1, and some components may be added, changed or deleted as necessary.

The transfer module 40 may include a wheel frame and a plurality of wheels as means for moving the baby carriage 1. [ More specifically, the wheel frame can be coupled to the lower portion of the housing 10. The wheel frame may be screwed to the housing 10, inserted and fixed, and may be integrally formed with the housing 10.

The plurality of wheels are coupled to the wheel frame to move the baby carriage 1. [ The wheels may be of any number, but may consist of three or more, preferably three, wheels for stability and convenience of movement of the stroller 1.

The structure of the wheel frame may vary depending on the number of wheels. When the number of wheels is three as shown in FIG. 1, the wheel frame may be composed of a front wheel frame for engaging with two wheels in front and a rear wheel frame for engaging with one wheel in the rear.

Here, the front and rear sides are according to an example, and unlike the above, the wheel frame may be composed of a rear wheel frame to be coupled with two wheels on the rear side and a front wheel frame to be coupled with one wheel on the front side.

Referring to FIG. 2, the housing 10 may have a top surface and a front surface. 2, the opening surface formed on the front surface of the housing 10 is shown as being clogged by the cover 20 described later, but the upper surface and the front surface of the housing 10 itself can be opened.

The open upper surface of the housing 10 can be formed oblique to the ground. Accordingly, the user (for example, the parent of the child) can secure a field of view of the child aboard the baby carriage 1, and the child aboard the baby carriage 1 can secure a view to the outside of the baby carriage 1 can do.

The housing 10 may be provided with a pair of grips 11. The user can move the stroller 1 by using the handle 11. [ Meanwhile, when the housing 10 is separated from the moving module 40, the user can use the housing 10 as a cradle by using the handle 11.

The housing 10 may further include a buffer member 12. Accordingly, the external impact applied to the housing 10 can be dispersed by the cushioning member 12.

Meanwhile, the housing 10 can be divided into an upper housing and a lower housing with respect to the buffer member 12, and the housing 10 can function as a bouncer through the buffer member 12.

Bouncers are one of the baby products that perform the function of helping infants rest and sleep by gently shaking the infant. In order to allow the housing 10 to function as a bouncer, the present invention may further include a swing module (not shown) for gently rocking the upper housing.

More specifically, the swing module may shake the upper housing against the fixed lower housing. Accordingly, the upper housing can swing at predetermined angles (left and right and up and down angles) and speed with respect to the lower housing.

Meanwhile, as shown in FIGS. 1 and 2, the outer surface of the housing 10 may be formed as a curved surface. More specifically, the housing 10 may be in the form of a sphere, preferably an elliptical sphere, open at the top and at the front. Accordingly, the housing 10 can disperse impact applied from the outside of the housing 10, thereby protecting the child who rides inside the housing 10 from an external impact.

Hereinafter, the cover 20 hinged to the front surface of the housing 10 will be described in detail with reference to FIGS. 3 to 5. FIG.

Referring to FIG. 3, the cover 20 is hinged to the front surface of the housing 10 so as to be selectively opened and closed. Here, the front surface of the housing 10 may be the structure of the housing 10 which is adjacent to the opened front surface of the entire structure of the housing 10.

On the other hand, the hinge joint means that two objects can be rotated with respect to the hinge axis but are coupled so that a few horizontal vertical movements are fixed. Accordingly, the cover 20 is rotatable relative to the front surface of the housing 10, but can be combined to fix the horizontal and vertical movements.

As shown in FIG. 3, the housing 10 may include a first opening 110 and a second opening 120 on the upper surface and the front surface, respectively. The cover 20 is hinged to the front surface of the housing 10 having the second opening 120 to selectively open and close the second opening 120.

More specifically, since the first opening 110 and the second opening 120 are adjacent to each other, the front surface of the housing 10 may be surrounded by the left end, the right end, and the bottom edge 13. The cover 20 may be hinged to the left end corner to be opened and closed to the left, or may be hinged to the right end corner to be opened and closed to the right.

However, as will be described later, the cover 20 may be hinged to the lower front edge 13 of the housing 10 to assist the child sitting on the stroller 1 in the sitting position. Accordingly, a hinge axis for hinge connection may be provided on the lower front edge 13 of the housing 10.

The cover 20 may form an opening / closing angle according to user input. To this end, the present invention is characterized in that a first input module (not shown) provided with a user input for the opening and closing angle of the cover 20 and a control unit for controlling the opening and closing angle of the cover 20 with respect to the front surface of the housing 10 And a hinge control module (not shown).

The first input module may be provided on the outer surface of the housing 10 or physically separated from the housing 10. For example, the first input module may be a button (switch) installed on the outer surface of the housing 10, or may be a remote controller capable of wireless communication with the hinge control module.

If the first input module is a button, the user input from the user may be a physical contact point signal. On the other hand, when the first input module is the remote controller, the input signal input from the user may be a wireless communication signal.

The hinge control module can be installed inside the housing 10 to control the opening and closing angle of the cover 20. [ For this purpose, the hinge control module may include a motor for adjusting the opening and closing angle of the cover 20. [

For example, when the first input module is a button provided on the outer surface of the housing 10, the button may include an upward control button and a downward control button. When the user presses the upward control button, the opening / closing angle of the cover 20 may increase upward, and when the user presses the downward control button, the opening / closing angle of the cover 20 may increase downward.

Referring to FIGS. 4 and 5, the child aboard the baby carriage 1 may have a greater height than the baby shown in FIG. At this time, when the open / close angle of the cover 20 is formed as shown in Fig. 4, the cover 20 can serve as a support frame for supporting the feet of the child.

On the other hand, when the opening / closing angle of the cover 20 is formed as shown in Fig. 5, the cover 20 may be completely turned downward so that the legs of the grown child can be dragged downward.

As described above, according to the present invention, by changing the structure of the stroller according to the development of the child, the stroller can be prevented from being replaced even if the child grows, and thus the cost for purchasing a new stroller can be saved.

FIG. 6 is a view showing fixing members provided on both side inner surfaces of the housing and both sides of the cover shown in FIG. 3, and FIG. 7 is a view showing the cover being fixed to the housing through the fixing member shown in FIG. Fig.

Hereinafter, the process of fixing the cover 20 to the housing 10 through the fixing members 14a, 14a ', 14b, 14b' will be described in detail with reference to FIGS.

6 is an enlarged view of the front face of the housing 10 and the cover 20 shown in Fig. Referring to FIG. 6, fixing members 14a and 14a 'for fixing the cover 20 to the housing 10 are formed on both side inner surfaces 10' of the housing 10 and both side ends 20 ' , 14b, 14b 'may be provided. Here, the fixing members 14a, 14a ', 14b, 14b' may include fixing projections 14b, 14b 'and fixing grooves 14a, 14a'.

When the fixing protrusions are provided on both side inner surfaces 10 'of the housing 10, they may be provided in the fixing grooves on both side ends 20' of the cover 20. Alternatively, when the fixing grooves are provided on the inner side surfaces 10 'of the housing 10, fixing projections may be provided on both side ends 20' of the cover 20.

7 is a schematic top view of the front face of the housing 10 and the cover 20 shown in Fig. Referring to FIG. 7, the fixing protrusions 14b and 14b 'provided at the opposite side ends 20' of the cover 20 are fixed to the fixing grooves 14a and 14a 'provided on the inner side surfaces 10' '). For this purpose, the fixing protrusions 14b and 14b 'provided on both side ends 20' of the cover 20 can be inserted into and out of the cover 20. [

More specifically, as shown in FIG. 7, the cover 20 can move toward the front surface of the housing 10. The fixing protrusions 14b and 14b 'provided on the opposite side ends 20' of the cover 20 are positioned on both sides of the housing 10 when the cover 20 starts to be adjacent to the inner side surfaces 10 ' Can be caught by the inner side surfaces 10 'and enter the inside of the cover 20.

When the cover 20 is moved to the fixing grooves 14a and 14a 'provided on both side inner surfaces 10' of the housing 10, the fixing protrusions 14b and 14b ' Can be drawn out and inserted into the fixing grooves 14a and 14a '.

7, fixing projections 14b and 14b 'are provided on both side ends 20' of the cover 20 and fixing grooves 14a and 14a 'are provided on both side inner surfaces 10' of the housing 10 The fixing projections may be formed on both side inner surfaces 10 'of the housing 10 and the fixing grooves may be formed on the both side ends 20' of the cover 20 as described above. However, Same as.

On the other hand, the cover 20 may form an opening / closing angle according to the weight applied to the bottom surface of the housing 10. To this end, the present invention includes a measurement module (not shown) for measuring the weight applied to the inner bottom surface of the housing 10 and a hinge control module for controlling the opening and closing angle of the cover 20 at an angle corresponding to the measured weight .

The measurement module may be provided on the inner bottom surface of the housing 10, and may be constituted by, for example, a digital weight sensing sensor. The hinge control module may be installed inside the housing 10 to control the open / close angle of the cover 20 and may include a motor as described above.

The hinge control module can control the opening / closing angle of the cover 20 at an angle corresponding to the weight of the eye measured by the measurement module. For example, if the measured weight is less than the first reference weight, the hinge control module may not open the cover 20. In other words, if the measured weight is less than the first reference weight, the hinge control module can control the cover 20 as shown in Fig.

When the measured weight is equal to or greater than the first reference weight and less than the second reference weight, the hinge control module can control the cover 20 as shown in FIG. In addition, if the measured weight is equal to or greater than the second reference weight, the hinge control module can control the cover 20 as shown in FIG.

As described above, according to the present invention, even if the user does not manually adjust the opening / closing angle of the cover, the body size of the child can be estimated according to the weight of the child so that the baby stroller structure suitable for the child's body can be automatically provided.

FIG. 8 is a view showing a sheet which is attached to and detached from the inner bottom surface of the housing, FIG. 9 is an upper sheet rotating with respect to the lower sheet, and FIGS. 10 to 12 are cross- And a sitting posture, respectively.

Hereinafter, the sheet 30 provided inside the housing 10 will be described in detail with reference to FIGS. 8 to 12. FIG.

Referring to FIG. 8, the seat 30 may be provided inside the housing 10. The seat 30 can be attached to and detached from the inner bottom surface 15 of the housing 10 through a detachable member (not shown). The inner bottom surface 15 of the housing 10 may be flat and the inner bottom surface 15 may be provided with a detachable member.

The detachable member is a means for coupling the seat 30 to the inner bottom surface 15 of the housing 10 and may be constituted by a velcro or a zipper. Accordingly, the lower surface of the seat 30 may be provided with a member corresponding to the detachable member provided on the inner bottom surface 15.

In one example, if the hooking surface is provided on the inner bottom surface 15 of the housing 10 when the attaching / detaching member is a ball screw, a hooking ring surface is provided on the lower surface of the seat 30, The seat 30 and the inner bottom surface 15 of the housing 10 can be engaged. Alternatively, a hooking surface may be provided on the inner bottom surface 15 of the housing 10, and a hook surface may be provided on the lower surface of the sheet 30. [

In another example, when the detachable member is a zipper, the inner bottom surface 15 of the housing 10 and the lower surface of the seat 30 are each provided with a tooth, and a tooth is combined with any one of the tabs So that the seat 30 and the inner bottom surface 15 of the housing 10 can be engaged with each other.

INDUSTRIAL APPLICABILITY As described above, the present invention can easily replace and clean the seat by attaching and detaching the seat provided in the baby carriage, thereby improving the hygiene management efficiency.

9, the seat 30 is attached to the lower seat 30a and the lower seat 30a by being detached from the inner bottom surface 15 of the housing 10 through the detachable member, And an upper sheet 30b which rotates relative to the upper sheet 30b. Since the hinge coupling has been described above, a detailed description thereof will be omitted.

The upper sheet 30b can form an angle with respect to the lower sheet 30a according to the rotation angle. As shown in Fig. 9, as the rotation angle increases upward, the upper sheet 30b can move from position (a) to position (c).

The upper sheet 30b may form a rotation angle with respect to the lower sheet 30a according to a user input. To this end, the present invention includes a second input module (not shown) provided with a user input for the rotation angle of the upper seat 30b and a second input module And an angle control module (not shown) for controlling the angle.

The second input module may be provided on the outer surface of the housing 10 or physically separated from the housing 10. For example, the second input module may be a button (switch) installed on the outer surface of the housing 10, or may be a remote controller capable of wireless communication with the angle control module.

If the second input module is a button, the user input from the user may be a physical contact signal. On the other hand, when the second input module is a remote controller, the input signal input from the user may be a wireless communication signal.

The angle control module may be installed inside the seat 30 to control the rotation angle of the upper seat 30b. For this purpose, the angle control module may include a motor for adjusting the rotation angle of the upper seat 30b.

For example, when the second input module is a button provided on the outer surface of the housing 10, the button may include an upward control button and a downward control button. When the user presses the upward control button, the rotation angle of the upper seat 30b may increase upward (increase from (a) to (c) in FIG. 9) The rotation angle can be increased downward (increase from (c) to (a) in Fig. 9).

9 to 12, when the upper seat 30b is adjusted to the position (a) shown in FIG. 9 under the control of the angle control module, the infant on the stroller 1 is shown in FIG. 10 And may be as shown.

On the other hand, when the upper seat 30b is adjusted to the position (b) shown in FIG. 9 according to the control of the angle control module, the infant on the stroller 1 may be as shown in FIG.

In addition, when the upper seat 30b is adjusted to the position (c) shown in FIG. 9 under the control of the angle control module, the infant on the stroller 1 may be as shown in FIG.

INDUSTRIAL APPLICABILITY As described above, the present invention can induce an attitude suitable for a child's activity by adjusting the angle of the seat provided on the stroller.

For example, when the child is sleeping, the user can adjust the angle of the seat as shown in FIG. 10 to induce an attitude capable of taking a good night's sleep.

In addition, when the child is active, the user can adjust the angle of the seat as shown in Fig. 11 to induce an attitude suitable for the activity.

Also, immediately after the child finishes eating, the user can adjust the angle of the seat as shown in Fig. 12 to induce an attitude suitable for digestion of food.

13 is a view showing a pair of binding grooves provided on both inner side surfaces of the housing. FIG. 14 is a view showing a state in which a plate is pulled into and out of a pair of binding grooves shown in FIG. 13, and FIG. 15 is a view showing a sitting position when the plate shown in FIG. 14 is pulled in.

Hereinafter, referring to Figs. 13 to 15, a description will be given of the plate 50 which is inserted into and outputted from the coupling grooves 16a and 16b and the coupling grooves 16a and 16b provided on the inner side surfaces of the housing 10 .

13 and 14, the present invention may further include a plate 50 which is inserted into and discharged from at least one pair of coupling grooves 16a and 16b provided on both inner side surfaces of the housing 10.

The inner side surfaces of the housing 10 on which the binding grooves 16a and 16b are provided may be formed flat so as to be perpendicular to the plate 50 to be drawn in and out. More specifically, the inner surface of the housing 10 may be curved like the outer surface of the housing 10. However, both inner side surfaces of the inner surface of the housing 10 where the binding grooves 16a and 16b are provided may be formed flat so as to be perpendicular to the plate 50 in and out.

As shown in Fig. 13, the pair of coupling grooves 16a and 16b may be formed to have a predetermined length toward the front. The predetermined length may be determined according to the length of the plate 50 in and out. In other words, the longer the length of the plate 50, the longer the length of the coupling grooves 16a and 16b for fixing the plate 50 can be.

13, two or more pairs of binding grooves having different heights from the paper surface may be provided on both inner side surfaces of the housing 10. The plate 50 can be pulled into and out of any one of the plurality of binding grooves.

As shown in Fig. 14, the plate 50 can be slidably engaged with the housing 10 by being pulled into and out of the pair of coupling grooves 16a, 16b. For this, the thickness of the binding grooves 16a, 16b may be the same as the thickness of the plate 50. [ In other words, the plate 50 is fixed by being pulled into the coupling grooves 16a and 16b having the same thickness as the thickness of the plate 50, and may not move in a direction other than the pull-out direction.

When the plate 50 is pulled into the pair of binding grooves 16a and 16b, the plate 50 and the infant on the baby carriage 1 may be as shown in Fig.

As described above, when two or more pairs of binding grooves having different heights from the ground are provided on both inner side surfaces of the housing 10, depending on the height of the binding groove into which the plate 50 is inserted, The height of the base 50 can be adjusted.

As described above, the present invention binds a plate (a simple table) to a baby carriage so that the baby carriage can be substituted for a dining table and a dining table without having to place a child on a separate dining table for a meal.

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, But the present invention is not limited thereto.

1: Stroller 10: Housing
20: cover 30: sheet
40: Moving module 50: Plate

Claims

A housing including a buffer member and having an upper surface and a front surface opened;
A sheet provided inside the housing;
A measurement module provided on an inner bottom surface of the housing to measure a weight applied to the inner bottom surface;
A cover hinged to the front surface of the housing;
A hinge control module that opens the cover if the measured weight is greater than or equal to a first reference weight and increases the degree of opening of the cover if the measured weight is greater than a second reference weight that is higher than the first reference weight; And
A moving module coupled to a lower portion of the housing,
Wherein the housing comprises a lower housing fixed to the moving module and an upper housing connected to the upper portion of the lower housing through the buffering member,
And a swing module for swinging the upper housing from side to side with respect to the lower housing
stroller.

The method according to claim 1,
Wherein the outer surface of the housing is curved.

The method according to claim 1,
The housing includes first and second openings respectively opened on an upper surface and a front surface,
Wherein the cover is hinged to a front surface of the housing to selectively open and close the second opening.

The method according to claim 1,
And the cover is hinged to the lower front edge of the housing.

The method according to claim 1,
An input module for receiving a user input for an opening / closing angle of the cover; And
And a hinge control module for controlling the opening and closing angle of the cover with respect to the front surface of the housing according to the provided user input.

The method according to claim 1,
Wherein a fixing member for fixing the cover to the housing is provided on both inner side surfaces of the housing and both side ends of the cover.

The method according to claim 6,
Wherein the fixing protrusion is provided on both inner side surfaces of the housing when the fixing protrusion is provided on both inner side surfaces of the housing and the fixing protrusion is provided on both inner ends of the housing, .

delete

The method according to claim 1,
Wherein the seat is detachably attached to an inner bottom surface of the housing through a detachable member.

10. The method of claim 9,
The sheet
A lower sheet attached to and detached from the inner bottom surface through the detachable member; And
And an upper sheet hinged to the lower seat to rotate with respect to the lower seat.

11. The method of claim 10,
An input module for receiving a user input for a rotation angle of the upper sheet; And
And an angle control module for controlling an angle of rotation of the upper seat relative to the lower seat according to the provided user input.

The method according to claim 1,
Further comprising: a plate that is inserted into and ejected from at least one pair of binding grooves provided on both inner side surfaces of the housing.

13. The method of claim 12,
Wherein the pair of binding grooves are formed with a predetermined length forward.

The method according to claim 1,
The mobile module
A wheel frame coupled to a lower portion of the housing; And
And at least three wheels coupled to the wheel frame.