Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
A BAG AND A METHOD FOR MANUFACTURING THE SAME AND PARTS OF THE BAG
Document Type and Number:
WIPO Patent Application WO/2004/054399
Kind Code:
A1
Abstract:
A bag and a method of manufacturing the bag are disclosed. The bag has a bag body comprising a bottom frame having a bottom portion and a wall portion extending upward along an edge of the bottom portion, and an upper body portion a base of which is opened and a lower end of which is connected with the bottom frame along the wall portion by sewing etc.. The bag also has shoulder straps connected with the front-side of the bag body. An epochal elevation of productivity in the manufacture of bags is achieved and the bag has advantages that convenient to use and storing.

More Like This:
WO/2024/043777A SUITCASE
JPH0884617TRAVELING BAG
WO/1998/008721SUITCASE AND CART ASSEMBLY
Inventors:
SONG YOUNG JIN (KR)
KWON TAE SUNG (KR)
Application Number:
PCT/KR2003/002760
Publication Date:
July 01, 2004
Filing Date:
December 17, 2003
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
SONG YOUNG JIN (KR)
KWON TAE SUNG (KR)
International Classes:
A45C5/14; A45C13/04; A45F3/04; A45C5/06; A45C13/26; A45C15/06; (IPC1-7): A45C13/26
Foreign References:
KR19990036581U1999-09-27
US5676286A1997-10-14
US5295565A1994-03-22
JPH09285329A1997-11-04
KR20000011039U2000-06-26
US5749503A1998-05-12
Attorney, Agent or Firm:
Park, Hee Jin (607-10 Yeoksam-don, Gangnam-gu Seoul 135-080, KR)
Download PDF:
Claims:
Claims
1. A bag comprising: a bag body capable of accommodating articles therein and to be opened or closed, wherein the bag body includes a bottom frame having a bottom section, and an upper body section, a lower end of the upper body section being coupled to the bottom frame along a predetermined route of the bottom frame in such a manner that the bottom frame is exposed to an exterior, the upper body section surrounding an upper space section of the bottom frame so as to form a receiving cavity for the articles together with the bottom frame, the upper body section having an opening/closing means.
2. The bag as claimed in claim 1, wherein the bottom frame includes the bottom section and a wall section upwardly extending from edges of the bottom section so that the bottom frame is formed in a container shape having an opened upper section, the bottom frame is made from plastic, and the lower end of the upper body section is made from fiber and is coupled to the bottom frame along the wall section of the bottom frame.
3. The bag as claimed in claim 1, wherein the bottom frame includes the bottom section and a wall section upwardly extending from edges of the bottom section so that the bottom frame is formed in a container shape having an opened upper section, a laminated strip having a thickness thinner than a thickness of the wall section is provided along one side of the wall section, and the lower end of the upper body section is coupled to the laminated strip through sewing work in a state that a lower portion of the upper body section is opened towards the bottom frame.
4. The bag as claimed in claim 3, further comprising at least one shoulder strap installed at a rear portion of the bag body for allowing a user to carry the bag on user's shoulders, an extendable handle installed at a front portion of the bag body and including extendable vertical members, lower ends of which are coupled to the bottom frame, and a handle installed at upper ends of the extendable vertical members, and wheels provided at the front portion of the bag body.
5. The bag as claimed in claim 4, wherein the bottom frame includes a wheel receiving section formed at one edge of the bottom frame in a concave shape for installation of the wheels, shaft coupling holes for receiving shafts of the wheels, vertical member coupling sections coupled with lower ends of the extendable vertical members of the extendable handle, and protrusions provided in opposition to the wheels and downwardly protruded in such a manner that the protrusions have a height corresponds to a size of a predetermined portion of the wheel, which downwardly protrudes from the wheel receiving section.
6. The bag as claimed in claim 5, wherein each shaft of the wheels includes a shaft member inserted into each shaft coupling hole through the wheels and formed at one end thereof with a screw part, and a screw member, which is screwcoupled with the shaft member so as to prevent the shaft member from be separated.
7. The bag as claimed in claim 5, wherein an upper end of the shoulder strap is fixedly coupled to an upper portion of the bag body through sewing work and a lower end of the shoulder strap is detachably coupled to a lower portion of the bag body.
8. The bag as claimed in claim 5, further comprising a rear pocket for receiving the shoulder strap so as to prevent the shoulder strap from being stained or damaged when dragging the bag by using the extendable handle.
9. The bag as claimed in claim 5, wherein cushions are provided at an inner portion of the shoulder strap, which makes contact with a user's body when the user carries the bag on user's shoulders, and at a backside of the bag body.
10. The bag as claimed in claim 5, wherein a partition is installed in the bag body such that the partition is folded in a multistep structure so as to cover both extendable vertical members and bottom section, and adhesive fabric is attached to an end of the partition and a predetermined portion of the bag body corresponding to the end of the partition such that the partition is detachably attached to the bag body.
11. A method for manufacturing a bag, the method comprising the steps of: preparing a bottom frame including a bottom section and a wall section upwardly extending from edges of the bottom section such that the bottom frame has a container shape having an opened upper section; and coupling a lower end of an upper body section having an opening/closing means to the wall section of the bottom frame to surround an upper space of the bottom frame in such a manner that the upper body section forms a receiving cavity for articles together with the bottom frame.
12. The method as claimed in claim 11, wherein a laminated strip is provided along the wall section of the bottom frame, and the lower end of the upper body section is coupled to the laminated strip through sewing work in a state that a lower portion of the upper body section is opened towards the bottom frame.
13. The method as claimed in claim 12, wherein at least one shoulder strap is installed at a rear portion of the bag body for allowing a user to carry the bag on user's shoulders, an extendable handle is installed at a front portion of the bag body, and wheels are installed at a front portion of the bottom frame, the extendable handle including extendable vertical members, lower ends of which are coupled to the front portion of the bottom frame and upper ends of which protrude to an exterior through an upper end of the upper body section by way of an interior of the upper body section, and a handle installed at upper ends of the extendable vertical members.
14. A wheel shaft for installing a wheel formed at a center thereof with a hole in a bag body formed with a shaft coupling hole, the wheel shaft comprising; a shaft member including a shaft section inserted into the shaft coupling hole through the hole of the wheel so as to allow the wheel to rotate, an anti separation section provided at a first end of the shaft section and having a size larger than a size of the shaft section so as to prevent the wheel from being separated from the shaft section, and a screw section formed at a second end of the shaft section in opposition to the first end of the shaft section; and a screw member, which is screwcoupled to the screw section of the shaft member so as to prevent the shaft member from being separated from the shaft coupling hole.
15. A bottom frame used for manufacturing a bag, the bottom frame comprising; a bottom section; a wall section extending upward from edges of the bottom section so that the bottom frame has a shape of a container having an open top; and a laminated strip formed along one side of the wall section and having a thickness smaller than a thickness of the wall section, a lower end of an upper body section of a bag being coupled to the laminated strip through sewing work.
Description:
A BAG AND A METHOD FOR MANUFACTURING THE SAME AND PARTS OF THE BAG Technical Field The present invention relates to a bag, a method for manufacturing the same, and parts of the bag. More particularly, the present invention relates to a bag proper for a student, which may contain school supplies, such as textbooks, reference books, a pencil case and the like, so that the student can carry the bag not only by the hand or on the shoulder but also by dragging the bag, and relates to a method for manufacturing the bag and parts of the bag.

Background Art In general, a bag includes a bag body, which receives articles and can be opened or closed by means of a zipper, one or more shoulder straps installed at a backside of the bag body, and a handle provided at an uppermost portion of the bag body. In addition to the parts as described above, an extendable handle and wheels may be provided in such a conventional bag, so as to allow a user to carry the bag simply by dragging the bag by means of the extendable handle and the wheels rolling on the ground.

The bag body of the conventional bag includes a body section made of fabric and an inner frame made of rigid material, such as rigid plastic, which is installed at an inner bottom portion of the body section. The inner frame maintains the bottom portion of the bag body to be in a flat state. Moreover, the inner frame provides rigidity to the bag body, which enables wheels and an extendable handle to be assembled with the bag body, thereby allowing the user to drag the bag on the ground when necessary. In the conventional bag for students, a hand carrier and wheels are positioned at a rear portion of the bag body, that is, they are positioned adjacent to the shoulder straps.

Hereinafter, such a conventional bag will be described with reference to the attached FIGS. 1 and 2.

Referring to FIGS. 1 and 2, a bag 100 includes a bag body 110 defining a space therein for receiving articles and having a zipper 111 for opening or closing the space in the bag body 110, a shoulder strap 112 provided at a backside of the bag body 110 so as to allow a user to carry the bag 100 on the shoulder, and a handle 114 provided at an upper end of the bag body 110 so as to allow a user to carry the bag 100 by the hand. In addition, an extendable handle 120 is installed at a rear upper portion of the bag body 110 adjacent to the shoulder strap 112 and wheels 130 are installed at both lower ends of a rear portion of the bag body 110.

Referring to FIG. 2, an inner frame 150 is installed at an inner bottom portion of the bag body 110 made of fabric. The inner frame 150 is made of rigid material, such as rigid plastic or reinforced paper, to provide rigidity to the lower part of the fabric bag body section 110a of the bag body 110, and has a wheel receiving section 152 for installing wheels 130 and an extendable section 154 for installing the extendable handle 120. The wheels 130 and the extendable handle 120 are coupled to the inner frame 150. A protrusion 160 is provided to balance the bag 100 in relation to the wheels 130. The protrusion 160 is coupled to the inner frame 150 from an exterior of the bag body 110 through a rivet 162. Fabric 111 of the bag body 110 surrounds an outer portion of the inner frame 150 while being fixed to the inner frame 150 through a plurality of rivets 162.

A conventional bag 100 having such a construction as described above is fabricated as follows. First, the fabric 111 is formed into the fabric bag body section 110a in a closed hexahedral shape with all of the six sides thereof closed. Then, the inner frame 150 made of plastic is accommodated in the fabric bag body section 110a in such a manner that the inner frame 150 is fixed

to a bottom of the fabric bag body section 110a by the rivet 162, thereby forming the bag body 110. After that, the wheels 130, the extendable handle 120 and the shoulder strap 112s are installed. At this time, either the shoulder straps 112 or the wheels and the extendable handle 120 may be assembled in advance with the fabric bag body section 110a.

As described with reference to FIGS. 1 and 2, it is very difficult to form a bottom section 113 of the fabric bag body section 110a when fabricating the conventional bag 100.

In addition, holes must be formed in predetermined portions of the bottom section 113 of the fabric bag body section 110a to not only receive shafts 132 of the wheels 130 but also enable the riveting work. However, a predetermined portion of the fabric bag body section 110a having the opening may be easily torn due to a property of fabric, so it is required to reinforce the predetermined portion of the fabric bag body section 110a by sewing leather on the predetermined portion of the fabric bag body section 110a.

Furthermore, not only must the protrusion 160 be provided at a lower portion of the bag body 110, but also separate riveting work is required to fix the inner frame 150 to the bottom section 113 of the fabric bag body section 11 Oa.

In addition, when users carry the bag 100 on their shoulder by using the shoulder strap 112, a vertical member 122 of the extendable handle 120 and the wheels 130 may apply force to the shoulder and back of the users, so the users feel uncomfortable. The users may feel a pain if the users carry the bag 100 on their shoulder for a long time.

Furthermore, if the users carry the bag 100 on their shoulder after the users have dragged the bag 100 on the ground, the cloth of the users may be stained with impurities, such as soil, adhering to the wheels 130. In addition, it is difficult to completely remove dirt or impurities adhering to the bottom section of the fabric bag body section, so a stain remains in the bottom section of the

fabric bag body section.

Disclosure of the Invention Therefore, the present invention has been made in view of the above- mentioned problems, and it is a first object of the present invention to provide a bag, which can be easily fabricated.

A second object of the present invention is to provide a bag, which does not require additional installation of a protrusion at a lower portion of a bag body.

A third object of the present invention is to provide a bag, which allows a user to easily and completely remove dirt or impurities adhering to a lower portion of the bag.

A fourth object of the present invention is to provide a bag, which can be loaded on a user's shoulder in a convenient manner.

A fifth object of the present invention is to provide a bag for students, the wheels of which are easily put on and taken off.

A sixth object of the present invention is to provide a bag for students, the wheels of which are easily put on and taken off and a vertical frame of a hand carrier is not represented in an inner portion of the bag.

A seventh object of the present invention is to provide a method for manufacturing a bag, which includes remarkably improved manufacturing steps, thereby remarkably increasing the productivity in manufacture of the bag.

An eighth object of the present invention is to provide parts adaptable for manufacturing a bag.

A final object of the present invention is to provide a bag, which can be used in a convenient manner, and to improve the productivity in manufacture of the bag.

According to an aspect of the present invention, there is provided a bag

comprising: a bag body capable of accommodating articles therein and to be opened or closed, wherein the bag body includes a bottom frame having a bottom section, and an upper body section, a lower end of the upper body section being coupled to the bottom frame along a predetermined route of the bottom frame in such a manner that the bottom frame is exposed to an exterior, the upper body section surrounding an upper space section of the bottom frame so as to form a receiving cavity for the articles together with the bottom frame, the upper body section having an opening/closing means.

According to a preferred embodiment of the present invention, the bottom frame includes the bottom section and a wall section upwardly extending from edges of the bottom section so that the bottom frame has a container shape having an opened upper section, the bottom frame is made from plastic, and the lower end of the upper body section is made from fiber and is coupled to the bottom frame along the wall section of the bottom frame.

The bottom frame includes the bottom section and a wall section upwardly extending from edges of the bottom section so that the bottom frame has a container shape having an opened upper section, a laminated strip having a thickness thinner than a thickness of the wall section is provided along one side of the wall section, and the lower end of the upper body section is coupled to the laminated strip through sewing work in a state that a lower portion of the upper body section is opened towards the bottom frame.

At least one shoulder strap is installed at a rear portion of the bag body for allowing a user to carry the bag on user's shoulders, an extendable handle is installed at a front portion of the bag body. The extendable handle includes extendable vertical members, lower ends of which are coupled to the bottom frame, and a handle installed at upper ends of the extendable vertical members.

Wheels are provided at the front portion of the bag body.

The bottom frame includes a wheel receiving section formed at one

edge of the bottom frame in a concave shape for installation of the wheels, shaft coupling holes for receiving shafts of the wheels, vertical member coupling sections coupled with lower ends of the extendable vertical members of the extendable handle, and protrusions provided in opposition to the wheels and downwardly protruded in such a manner that the protrusions have a height corresponds to a size of a predetermined portion of the wheel, which downwardly protrudes from the wheel receiving section.

Each shaft of the wheels includes a shaft member inserted into each shaft coupling hole through the wheels and formed at one end thereof with a screw part, and a screw member, which is screw-coupled with the shaft member so as to prevent the shaft member from be separated.

An upper end of the shoulder strap is fixedly coupled to an upper portion of the bag body through sewing work and a lower end of the shoulder strap is detachably coupled to a lower portion of the bag body.

A rear pocket is further provided for receiving the shoulder strap so as to prevent the shoulder strap from being stained or damaged when dragging the bag by using the extendable handle.

Cushions are provided at an inner portion of the shoulder strap, which makes contact with a user's body when the user carries the bag on user's shoulders, and at a backside of the bag body.

A partition is installed in the bag body such that the partition is folded in a multi-step structure so as to cover both extendable vertical members and bottom section, and adhesive fabric is attached to an end of the partition and a predetermined portion of the bag body corresponding to the end of the partition such that the partition is detachably attached to the bag body.

According to a preferred embodiment of the present invention, the method for manufacturing a bag comprises the steps of: preparing a bottom frame including a bottom section and a wall section upwardly extending from

edges of the bottom section such that the bottom frame has a container shape having an opened upper section; and coupling a lower end of an upper body section having an opening/closing means to the wall section of the bottom frame to surround an upper space of the bottom frame in such a manner that the upper body section forms a receiving cavity for articles together with the bottom frame.

A laminated strip is provided along the wall section of the bottom frame, and the lower end of the upper body section is coupled to the laminated strip through sewing work in a state that a lower portion of the upper body section is opened towards the bottom frame.

At least one shoulder strap is installed at a rear portion of the bag body for allowing a user to carry the bag on user's shoulders, an extendable handle is installed at a front portion of the bag body, and wheels are installed at a front portion of the bottom frame. The extendable handle includes extendable vertical members, lower ends of which are coupled to the front portion of the bottom frame and upper ends of which protrude to an exterior through an upper end of the upper body section by way of an interior of the upper body section, and a handle installed at upper ends of the extendable vertical members.

According to a preferred embodiment of the present invention, a wheel shaft is provided for installing a wheel formed at a center thereof with a hole in a bag body formed with a shaft coupling hole. The wheel shaft comprises a shaft member including a shaft section inserted into the shaft coupling hole through the hole of the wheel so as to allow the wheel to rotate, an anti- separation section provided at a first end of the shaft section and having a size larger than a size of the shaft section so as to prevent the wheel from being separated from the shaft section, and a screw section formed at a second end of the shaft section in opposition to the first end of the shaft section; and a screw member, which is screw-coupled to the screw section of the shaft

member so as to prevent the shaft member from being separated from the shaft coupling hole.

According to a preferred embodiment of the present invention, a bottom frame used for manufacturing the bag may comprise; a bottom section; a wall section extending upward from edges of the bottom section so that the bottom frame has a shape of a container having an open top; and a laminated strip formed along one side of the wall section and having a thickness smaller than a thickness of the wall section, a lower end of an upper body section of a bag being coupled to the laminated strip through sewing work.

Brief Description of the Drawings FIG. 1 is a perspective view showing a conventional bag; FIG. 2 is a sectional view taken along line"I-1"shown in FIG. 1 when an extendable handle partially extends in an upper direction thereof; FIG. 3 is a perspective view showing a bag according to one embodiment of the present invention; FIG. 4 is a perspective view showing an inner portion of a bag shown in FIG. 3; FIG. 5 is an exploded perspective view of a bag shown in FIG. 3; FIG. 6 is an exploded perspective view showing an extendable handle and wheels installed at a bottom frame of a bag; FIG. 7 is an exploded perspective view showing a bottom frame according to another embodiment of the present invention; FIG. 8 is a plan view of a bottom frame; FIG. 9 is a sectional view taken along line"J-J"shown in FIG. 8; and FIG. 10 is a partially sectional view showing a connection between a lower end of an upper body section and a bottom frame.

Best Mode for Carrying Out the Invention Reference will now be made in detail to the preferred embodiments of the present invention.

Referring to FIGS. 3 to 6, a bag 200 of the present invention includes a bag body 210. The bag body 210 has a bottom frame 220 forming a lower structure of the bag body 210 and exposed to an exterior and an upper body section 240 connected to the bottom frame 220 and positioned at an upper portion of the bottom frame 220.

The bottom frame 220 has a bottom section 222 and a wall section 224 upwardly extending from an edge of the bottom section 222, thereby forming a container having an opened upper section. It is preferred that the bottom frame 220 has a substantially rectangular shape having an open top. Of course, the bottom frame 220 may have various shapes, including shapes of a cylindrical container, a pentagonal container, a hexagonal container, and an oval container, each having an open top. Moreover, the bottom frame 220 may have another shape other than the container shape. In other words, the wall section 224 of the bottom frame 220 is not required to be formed at all side edges of the bottom section 222. That is, one lower end of the upper body section 240 can be directly connected to the bottom section 222 without forming the wall section 224 at one side of the bottom frame 220. However, such a direct connection is not preferred since it causes work, such as sewing, to increase and become more complicated. The bottom frame 220 is preferably fabricated from plastic material.

As shown in FIG. 5, the bottom frame 220 has wheel receiving sections 226. Both edges of one side of the bottom frame 220 are depressed inward to form the wheel receiving sections 226 each in a concave shape, in which the wheels 202 can be received. Each of the wheel receiving sections 226 has a reinforcement part 228 formed at an inner portion thereof. A shaft coupling

hole 230, which is communicated with an inner portion of the bottom frame 220 through the reinforcement part 228, is formed in the reinforcement section 228.

A shaft 270 of the wheel 202 includes a shaft member 270a and a screw member 276. The shaft member 270a has a shaft section 272, which is provided at one end thereof with a screw part 271 b such that the shaft section 272 can be inserted into the wheel 202 through a hole formed in the wheel 202 and the shaft coupling hole 230, and an anti-separation part 273 installed in opposition to the screw part 271 so as to prevent the wheel 202 from being separated. The screw member 276 is screw-coupled with the screw part 271 of the shaft member 270a so as to prevent the shaft member 270a from being separated from the bottom frame 220. It is preferred that the anti-separation part 273 of the shaft member 270a and a head part of the screw member 276 are formed in polygonal shapes or polygonal slots 277 are formed adjacent to the anti-separation part 273 of the shaft member 270a and the head part of the screw member 276 so as to allow the anti-separation part 273 of the shaft member 270a and the head part of the screw member 276 to be easily assembled with each other or disassembled from each other. As the wheel 202, a luminescent wheel may be employed to allow persons to easily recognize the wheel 202, thereby preventing accident.

As shown in FIG. 6, a pair of vertical member coupling sections 232 are provided on the bottom frame 220 and are spaced a predetermined interval apart from each other. A lower end of a vertical supporter 282 is inserted into each vertical member coupling section 232 and fixed to the bottom frame 220 through a screw member 284. The vertical supporter 282 preferably includes a telescopic vertical supporter, which is extendable in two or three steps. Installed at upper ends of the vertical supporters 282 are a connection member 286 for connecting the vertical supporters 282 to each other and pairs of female and male coupling members 288 and 289 for fixing the upper ends of the vertical

supporters 282 to an upper end of the upper body section 240. A pair of vertical members 282a are protruded to an exterior of the bag 200 by passing through an upper end of the upper body section 240. A handle 290 is provided at upper ends of the vertical members 282a so as to couple the vertical members 282a to each other. A coupling structure for the vertical members 282a with respect to the vertical supporters 282 may be achieved through a conventional manner by using balls 292 supported by springs.

A pair of protrusions 234 are downwardly protruded from an underside of the bottom frame 220 and are spaced a predetermined interval apart from each other. The protrusions 234 are integrally formed with the underside of the bottom frame 220. A height of the protrusions 234 corresponds to a size of a predetermined portion of the wheel 202, which downwardly protrudes from the bottom section 222, so as to prevent the bag body 210 from being biased in a predetermined direction when the bag 200 is placed in an upright position.

A laminated strip 236 is formed along an upper end of the wall section 224. The laminated strip 236 is provided to allow a lower end 240a of the upper body section 240 to be coupled to the laminated strip 236 through a sewing work. It is preferred that the laminated strip 236 is formed along the upper end of the wall section 234. However, the laminated strip 235 may be provided at various portions of the wall section 234 other than the upper end of the wall section 234 and may have a structure of two steps or more.

Since the lower end 240a of the upper body section 240 is coupled to the wall section 224, parts of the bottom section 222 and the wall section 224 of the bottom frame 220 are exposed to an exterior. Since the bottom frame 220 is made of plastic material, a user can easily remove impurities, such as soil, from the bottom frame 220 by using a rag even if impurities adhere to the underside of the bag 200.

The upper body section 240 is provided at an upper portion of the bottom

frame 220. The upper body section 240 is preferably made of fiber. Preferably, a lower portion of the upper body section 240 is opened and the lower end 240a of the upper body section 240 is coupled to the bottom frame 220 along the wall section 224 of the bottom frame 220 so that the bottom frame 220 is exposed to the exterior. The lower end 240a of the upper body section 240 is coupled to the laminated strip 236 through a sewing work, which is one of characteristics of the present invention. The upper body section 240 is coupled to the bottom frame 220 in such a manner that the upper body section 240 forms a receiving cavity for receiving articles together with the bottom frame 220. The upper body section 240 has an opening/closing device 241, such as a main zipper.

That is, since a lower portion of the upper body section 240 is opened, the upper body section 240 can be easily fabricated. In addition, since a hole forming work or a riveting work for the upper body section 240 is not required, productivity of the bag body 210 can be significantly increased.

Referring to FIGS. 3 and 5, shoulder straps 242 allowing a user to carry the bag 200 on user's shoulder are formed at a rear portion of the upper body section 240. In addition, a rear pocket 244 for storing the shoulder straps 242 can be provided at the rear portion of the upper body section 240 as necessary.

The lower end of the shoulder straps 242 can be attached to or detached from the upper body section 240 through a clip 246 provided at a lower portion of the shoulder straps 242. A cushion member 243 is provided at an inner portion of the shoulder straps 242 and the rear portion of the upper body section 240 to enable the user feel more comfortable in loading the bag 200 on the shoulder.

A zipper 248 is provided at the upper body section 240 in order to adjust a size of the bag 200 and a handle 250 is provided at one upper end of the upper body section 240. A front pocket 252 is prepared at a front side of the upper body section 240. The front pocket 252 is covered with a first pocket cover 253. The first pocket cover 253 can be opened/closed from a front of the

bag body 210 by using the pocket zipper 254. The front pocket 253 is formed at an inner portion thereof with a pencil holder section 255 for receiving pencils or ballpoint pens and a small pocket 256 for receiving small articles. It may improve a user's convenience if articles, which are frequently used, are stored in the small pocket 256 since the user can rapidly find the articles by easily opening the front pocket 252.

A pocket 257 and a second pocket cover 258 for covering the pocket 257 are provided at a front side of the first pocket cover 253. A pocket 259a, which is opened/closed by means of a zipper 259, is formed in the second pocket cover 258. In addition, a lower end of the second pocket cover 258 is detachably coupled to the first pocket cover 253 through a clip 259b.

A partition 310 for covering the vertical supporters 282 and the bottom section 222 is installed in the upper body section 240 in such a manner that the partition 310 can be folded in a multi-step structure. In addition, an adhesive fabric 312 is formed at an end of the partition 312 and at an inner portion of the upper body section 240 corresponding to the end of the partition 310 so that the end of the partition 312 is detachably attached to the inner portion of the upper body section 240.

In addition, an auxiliary pocket 240b made of transparent vinyl is provided at an inner portion of the upper body section 240, to which the shoulder straps 242 are connected.

According to the bag 200 having the above-mentioned structure, the lower end 240a of the upper body section 240 is coupled to the wall section 224 of the bottom frame through the sewing work, so the manufacturing process of the bag 200 can be significantly improved. To this end, the laminated strip 236 is formed along the wall section 224 of the bottom frame 220 and the lower portion of the upper body section 240 is opened towards the bottom frame 220 as shown in FIG. 5.

The bag 200 has the shoulder straps 242 installed at the rear portion of the bag body 210. In addition, the extendable handle 280 and the wheels 202 are provided at the front of the bag body 210. Thus, the user can conveniently carry the bag 200 on user's shoulders by using the shoulder straps 242 and the wheels 202 stained with impurities cannot make contact with the back of the user.

Referring to FIG. 7, laminated strips 236 and 236a formed at the bottom frame 220 can be provided below the upper end of the wall section 224 with at least two-step structure. In addition, a shaft coupling hole 230a may extend to a lower end of the vertical coupling section 232, which is different from the previously described embodiment having the shaft coupling hole 230 formed only in the reinforcement part 228. Remaining parts shown in FIG. 7 are identical to those of the previously described embodiment.

Referring to FIGS. 8 and 9, the protrusions 234 are integrally formed with the bottom frame 220. Thus, additional parts and the riveting work for installing the protrusions 234 are not required, so that productivity of the bag increases and robustness of the bag is improved. Remaining parts shown in FIGS. 8 and 9 are identical to those of the previously described embodiment.

Referring to FIG. 10, the lower end 240a of the upper body section 240 is coupled to the laminated strip 236 through a sewing work by using a thread 320 in a state in which the lower end 240a of the upper body section 240 surrounds the laminated strip 236 of the bottom frame 220. In order to increase connection strength between the upper body section 240 and the bottom frame 220 and to improve an internal appearance of the bag 200, finishing material 330 is further sewed on a connection part between the upper body section 240 and the laminated strip 236. Instead of the sewing work, adhesive, a clip or a metal member can be used for connecting the lower end 240a of the upper body section 240 to the bottom frame 220. In this case, it is not required to provide

the laminated strip 236.

While this invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiment and the drawings, but, on the contrary, it is intended to cover various modifications and variations within the spirit and scope of the appended claims.

Industrial Applicability As described above, the bag, the method for manufacturing the bag and parts of the bag according to the present invention can improve the manufacturing process of the bag so that productivity of the manufacture of the bag may increase.

In addition, according to the present invention, the number of holes formed in a fabric section of the bag body can be reduced and the protrusions are integrally formed with the bottom frame so that robustness of the bag can be improved and impurities adhering to the lower portion of the bag can be easily removed.

Furthermore, according to the present invention, the extendable handle and wheels are provided in opposition to the shoulder straps, so the user can easily carry the bag on user's shoulders by using the shoulder straps and the wheels can be easily installed and exchanged because the wheel shaft has a unique structure.