Description CART TYPE BAG

Technical Field

[1] The present invention relates to a cart type bag, and more particularly, to a cart type bag whose volume can be minimized when the cart type bag is carried or stored. Background Art

[2] In general, a cart type bag has a standardized external shape irrespective of the volume of stored items. Such a cart type bag includes wheels installed at the bottom side of the bag and a handle fixed on the top side of the bag for convenience of transport.

[3] Since the cart type bag is standardized in its external shape, it has a big problem of increase of distribution cost in a distribution phase. In addition, it is inconvenient for a user to store the cart type bag because of its volume. Disclosure of Invention Technical Problem

[4] To overcome the above problems, it is an object of the present invention to provide a cart type bag whose volume can be minimized when the cart type bag is carried or stored, while keeping convenience of the cart type bag. Technical Solution

[5] To achieve the above object, according to a first aspect, the present invention provides a cart type bag, which is made of material that can be shrunk or restored depending on the volume of stored items, comprising: a bottom side volume adjustment member (100) that is arranged in the inner bottom side of the bag and comprises a pair of opposite base plates (110 and 120), which are foldable or unfoldable; a rest 200 that is arranged in the outer bottom side of the bag and is fixed to one (110) of the pair of base plates (110 and 120); a bag movement member (300) that comprises a mount (310) that is arranged in the outer bottom side of the bag and is fixed to the other (120) of the pair of base plates (110 and 120) and in which a mounting space (310a) is defined in the outer bottom side of the bag, and wheels (320) that are respectively fixed to both lower edges of the mount (310); and a balancing means that includes a fixing tube (415) that is arranged at the bottom side of the mount (310) in correspondence to at least one receiving hole (414) formed in an end side of the rest (200) and has a drawing-out hole (415a) formed on a side of the fixing tube; a balancing tube (416) that is inserted in the fixing tube (415) through the receiving hole (414) and has a connecting hole (416a) formed on a side of the balancing tube (416) and corresponding to the drawing-out hole (414); a receiving box (417) that is

provided inside the balancing tube (416); and an operation switch (420) that is provided inside the receiving box (417) and includes an operation projection (418) projecting outwardly through the connecting hole (416a) and the drawing-out hole (415a) and an elastic spring (419) fixed to the operation projection (418).

[6] According to a second aspect, the present invention provides a cart type bag, which is made of material that can be shrunk or restored depending on the volume of stored items, comprising: a bottom side volume adjustment member (100) that is arranged in the inner bottom side of the bag and comprises a pair of opposite base plates (110 and 120), which are foldable or unfoldable; a rest 200 that is arranged in the outer bottom side of the bag and is fixed to one (110) of the pair of base plates (110 and 120); a bag movement member (300) that comprises a mount (310) that is arranged in the outer bottom side of the bag and is fixed to the other (120) of the pair of base plates (110 and 120) and in which a mounting space (310a) is defined in the outer bottom side of the bag, and wheels (320) that are respectively fixed to both lower edges of the mount (310); and a balancing means that includes a fixing tube (458) that is arranged at the bottom side of the mount (310) in correspondence to at least one receiving hole (457) formed in an end side of the rest (200) and has a drawing-out hole (458a) formed on a side of the fixing tube (458); a balancing tube (459) that is inserted in the fixing tube (458) through the receiving hole (457) and has a fixing hole (459a) formed on a side of the balancing tube (459) and corresponding to the drawing-out hole (458a); an elastic spring (437) that has one end connected and fixed to the fixing tube (458) and the other end contacting the balancing tube (459) so that the balancing tube (459) inserted in the fixing tube (458) can be drawn out of the fixing tube (458) by an elastic force; an operation switch (438) that has one end having a fixing projection (438a) to be inserted in the fixing hole (459a) and the other end projecting through the drawing-out hole (458a), and an elastic spring (439) that is provided on the circumference of the operation switch (438) and has one end contacting the inner circumference of the fixing projection (438a) and the other end contacting the inner side of the fixing tube (458).

[7] According to a third aspect, the present invention provides a cart type bag, which is made of material that can be shrunk or restored depending on the volume of stored items, comprising: a bottom side volume adjustment member (100) that is arranged in the inner bottom side of the bag and comprises a pair of opposite base plates (110 and 120), which are foldable or unfoldable; a rest 200 that is arranged in the outer bottom side of the bag and is fixed to one (110) of the pair of base plates (110 and 120); a bag movement member (300) that comprises a mount (310) that is arranged in the outer bottom side of the bag and is fixed to the other (120) of the pair of base plates (110 and 120) and in which a mounting space (310a) is defined in the outer bottom side of the

bag, and wheels (320) that are respectively fixed to both lower edges of the mount (310); and a balancing means that includes a fixing rack (441) that has a fixing hole (441a) formed on an end of the fixing rack (441) and having a screw thread on the inner side of the fixing hole (441a) in correspondence to at least one through hole (440) formed in an end side of the rest (200); and a balancing bar (442) that has an end having a screw thread (442a) that is formed on its circumference and engages with the fixing hole (441a) of the fixing rack (441) through the through hole (440).

[8] According to a fourth aspect, the present invention provides a cart type bag, which is made of material that can be shrunk or restored depending on the volume of stored items, comprising: a bottom side volume adjustment member (100) that is arranged in the inner bottom side of the bag and comprises a pair of opposite base plates (110 and 120), which are foldable or unfoldable; a rest 200 that is arranged in the outer bottom side of the bag and is fixed to one (110) of the pair of base plates (110 and 120); a bag movement member (300) that comprises a mount (310) that is arranged in the outer bottom side of the bag and is fixed to the other (120) of the pair of base plates (110 and 120) and in which a mounting space (310a) is defined in the outer bottom side of the bag, and wheels (320) that are respectively fixed to both lower edges of the mount (310); and a balancing means that includes a fixing tube (444) that is arranged at the bottom side of the mount (310) in correspondence to at least one receiving hole (443) formed in an end side of the rest (200), with a screw thread (443 a) formed on the inner circumference of the receiving hole (443); and a balancing tube (445) that is inserted in the fixing tube (444) with a screw thread (445 a) formed on the outer circumference of a leading end of the balancing tuber (445).

[9] According to a fifth aspect, the present invention provides a cart type bag, which is made of material that can be shrunk or restored depending on the volume of stored items, comprising: a bottom side volume adjustment member (100) that is arranged in the inner bottom side of the bag and comprises a pair of opposite base plates (110 and 120), which are foldable or unfoldable; a rest 200 that is arranged in the outer bottom side of the bag and is fixed to one (110) of the pair of base plates (110 and 120); a bag movement member (300) that comprises a mount (310) that is arranged in the outer bottom side of the bag and is fixed to the other (120) of the pair of base plates (110 and 120) and in which a mounting space (310a) is defined in the outer bottom side of the bag, and wheels (320) that are respectively fixed to both lower edges of the mount (310); and a balancing means that includes a pair of one side fixing members (446) that is provided on the bottom side of the rest (200), with hooking grooves formed on outer sides of the one side fixing members (446); the other side fixing member (451) that is provided in correspondence to the one side fixing member (446) and includes a fixture (448) attached on a fixing plate (447) provided on the bottom side of the mount (310),

a rotating piece (449) hinged to the fixture (448), and a fixing loop (450) rotatably combined to both side of the hinged rotating piece (449); and a rotation prevention projection (452) that projects from sides of projections formed on the bottom side of the rest (200) for preventing the fixing loop (450) from seceding from the rotating piece (449).

[10] According to a sixth aspect, the present invention provides a cart type bag, which is made of material that can be shrunk or restored depending on the volume of stored items, comprising: a bottom side volume adjustment member (100) that is arranged in the inner bottom side of the bag and comprises a pair of opposite base plates (110 and 120), which are foldable or unfoldable; a rest 200 that is arranged in the outer bottom side of the bag and is fixed to one (110) of the pair of base plates (110 and 120); a bag movement member (300) that comprises a mount (310) that is arranged in the outer bottom side of the bag and is fixed to the other (120) of the pair of base plates (110 and 120) and in which a mounting space (310a) is defined in the outer bottom side of the bag, and wheels (320) that are respectively fixed to both lower edges of the mount (310); and a balancing means that includes a fixing rack (453) that is provided on the bottom side of the rest (200), with a hooking projection (453a) from an outer side of the fixing rack (453); a balancing plate (454) that is formed with an insertion hole (454a) in which the hooking projection (453a) is inserted near an end of the balancing plate (454); a flange (455) that is provided at the bottom side of the mount (310) and is hinged with the balancing plate (454); and a rotation prevention projection (456) that projects from sides of projections formed on the bottom side of the rest (200) for preventing the balancing plate (454) from rotating beyond the projection (456).

[11] According to another aspect, the present invention provides a cart type bag, which is made of material that can be shrunk or restored depending the volume of stored items, comprising: a bottom side volume adjustment member (600) that is arranged in the inner bottom side of the bag and comprises a pair of opposite base plates (610 and 620), which are foldable or unfoldable; a rest (700) that is arranged in the outer bottom side of the bag and is fixed to one (610) of the pair of base plates (610 and 620); a bag movement member (800) that comprises a mount (810) that is arranged in the outer bottom side of the bag and is fixed to the other (620) of the pair of base plates (610 and 620) and in which a mounting space (810a) having a shape corresponding to a bent external appearance of the outer bottom side of the bag is defined, and wheels (820) that are respectively fixed to both lower edges of the mount (810); and a balancing plate (900) that is detachably hooked (910) with the pair of base plates (610 and 620) to balance the pair of base plates (610 and 620) constituting the bottom side volume adjustment member (600) such that the pair of base plates (610 and 620) are not folded after the pair of base plates (610 and 620) is unfolded.

Brief Description of the Drawings

[12] Fig. 1 is an exploded perspective view illustrating a cart type bag according to the present invention.

[13] Fig. 2 is a combined perspective view illustrating the cart type bag according to the present invention.

[14] Fig. 3 is a perspective view showing a use condition of the cart type bag according to the present invention.

[15] Fig. 4 is a main part perspective view illustrating a fixed condition of a retractable handle fixed to the cart type bag according to the present invention.

[16] Fig. 5 is a main part perspective view illustrating a balancing means provided in a cart type bag according to a first embodiment of the present invention.

[17] Fig. 6 is a main part sectional view illustrating an operation condition of a balancing means of Fig. 5 according to the first embodiment of the present invention.

[18] Fig. 7 is a main part perspective view illustrating a balancing means provided in a cart type bag according to a second embodiment of the present invention.

[19] Fig. 8 is a main part sectional view illustrating an operation condition of a balancing means of Fig. 7 according to the second embodiment of the present invention.

[20] Fig. 9 is a main part perspective view illustrating a balancing means provided in a cart type bag according to a third embodiment of the present invention.

[21] Fig. 10 is a main part perspective view illustrating a balancing means provided in a cart type bag according to a fourth embodiment of the present invention.

[22] Fig. 11 is a main part perspective view illustrating a balancing means provided in a cart type bag according to a fifth embodiment of the present invention.

[23] Fig. 12 is a main part perspective view illustrating a balancing means provided in a cart type bag according to a sixth embodiment of the present invention.

[24] Fig. 13 is an exploded perspective view illustrating a cart type bag according to another embodiment of the present invention. Mode for the Invention

[25] Hereinafter, a structure and operation of a cart type bag according to exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[26] Fig. 1 is an exploded perspective view illustrating a cart type bag according to the present invention, Fig. 2 is a combined perspective view illustrating the cart type bag according to the present invention, Fig. 3 is a perspective view showing a use condition of the cart type bag according to the present invention, and Fig. 4 is a main part perspective view illustrating a fixed condition of a retractable handle fixed to the cart type bag according to the present invention.

[27] As shown in Figs. 1 to 4, according to the present invention, a cart type bag, which is made of material that can be shrunk or restored depending the volume of stored items, comprises: a bottom side volume adjustment member 100 that is arranged in the inner bottom side of the bag and comprises a pair of opposite base plates 110 and 120, which are foldable or unfoldable; a rest 200 that is arranged in the outer bottom side of the bag and is fixed to one 110 of the pair of base plates 110 and 120; a bag movement member 300 that comprises a mount 310 that is arranged in the outer bottom side of the bag and is fixed to the other 120 of the pair of base plates 110 and 120 and in which a mounting space 310a having a shape corresponding to a bent external appearance of the outer bottom side of the bag is defined, and wheels 320 that are respectively fixed to both lower edges of the mount 310; and a balancing means that balances the pair of base plates 110 and 120 constituting the bottom side volume adjustment member 100 such that the pair of base plates 110 and 120 are not folded after the pair of base plates 110 and 120 is unfolded.

[28] Preferably, material of the cart type bag is one selected from a group consisting of cloth, vinyl, leather and a combination thereof.

[29] One side of the bag movement member 300 that a body of a user (the back) touches is designed to have a shape that fits the body.

[30] The bottom side volume adjustment member 100, the rest 200, and the mount 310 constituting the bag movement member 300, which are arranged with the bottom side therebetween, are interconnected and fixed by a rivet 10 or the like.

[31] The bottom side volume adjustment member 100 may be configured in various ways. For example, the pair of base plates 110 and 120 constituting the bottom side volume adjustment member 100 may be integrally formed and a fold groove 130 may be formed along a boundary between the pair of integrally formed base plates 110 and 120.

[32] Alternatively, the pair of base plates 110 and 120 constituting the bottom side volume adjustment member 100 may be separately formed, and interconnected and fixed by a hinge (not shown).

[33] The balancing means comprises a fixing tube 412 that is arranged at the bottom side of the mount 310 in correspondence to at least one through hole 411 formed in an end side of the rest 200, and a balancing bar 413 inserted in the fixing tube 412 through the through hole 411.

[34] Here, a hooking hole 412 is formed at one end of the fixing tube 412 and the balancing bar 413 is formed with a hooking jaw 413a to be inserted in the hooking hole 412a to prevent the balancing bar 413 inserted in the fixing tube 412 through the through hole 411 from being separated from the fixing tube 412.

[35] When a user presses down the hooking jaw 413a having its rear side and both sides

cut, the balancing bar 413 is separated from the fixing tube 412.

[36] The above-described balancing means provided in the cart type bag may be configured in various ways.

[37] Fig. 5 is a main part perspective view illustrating a balancing means provided in a cart type bag according to a first embodiment of the present invention, and Fig. 6 is a main part sectional view illustrating an operation condition of a balancing means of Fig. 5 according to the first embodiment of the present invention.

[38] As shown in Figs. 5 and 6, a balancing means of a cart type bag according to a first embodiment of the present invention includes a fixing tube 415 that is arranged at the bottom side of the mount 310 in correspondence to at least one receiving hole 414 formed in an end side of the rest 200 and has a drawing-out hole 415a formed on a side of the fixing tube; a balancing tube 416 that is inserted in the fixing tube 415 through the receiving hole 414 and has a connecting hole 416a formed on a side of the balancing tube 416 and corresponding to the drawing-out hole 414; a receiving box 417 that is provided inside the balancing tube 416; and an operation switch 420 that is provided inside the receiving box 417 and includes an operation projection 418 projecting outwardly through the connecting hole 416a and the drawing-out hole 415a and an elastic spring 419 fixed to the operation projection 418.

[39] Fig. 7 is a main part perspective view illustrating a balancing means provided in a cart type bag according to a second embodiment of the present invention, and Fig. 8 is a main part sectional view illustrating an operation condition of a balancing means of Fig. 7 according to the second embodiment of the present invention.

[40] As shown in Figs. 7 and 8, a balancing means of a cart type bag according to a second embodiment of the present invention includes a fixing tube 458 that is arranged at the bottom side of the mount 310 in correspondence to at least one receiving hole 457 formed in an end side of the rest 200 and has a drawing-out hole 458a formed on a side of the fixing tube 458; a balancing tube 459 that is inserted in the fixing tube 458 through the receiving hole 457 and has a fixing hole 459a formed on a side of the balancing tube 459 and corresponding to the drawing-out hole 458a; an elastic spring 437 that has one end connected and fixed to the fixing tube 458 and the other end contacting the balancing tube 459 so that the balancing tube 459 inserted in the fixing tube 458 can be drawn out of the fixing tube 458 by an elastic force; an operation switch 438 that has one end having a fixing projection 438a to be inserted in the fixing hole 459a and the other end projecting through the drawing-out hole 458a, and an elastic spring 439 that is provided on the circumference of the operation switch 438 and has one end contacting the inner circumference of the fixing projection 438a and the other end contacting the inner side of the fixing tube 458.

[41] Fig. 9 is a main part perspective view illustrating a balancing means provided in a

cart type bag according to a third embodiment of the present invention.

[42] As shown in Fig. 9, a balancing means of a cart type bag according to a third embodiment of the present invention includes a fixing rack 441 that has a fixing hole 441a formed on an end of the fixing rack 441 and having a screw thread on the inner side of the fixing hole 441a in correspondence to at least one through hole 440 formed in an end side of the rest 200; and a balancing bar 442 that has an end having a screw thread 442a that is formed on its circumference and engages with the fixing hole 441a of the fixing rack 441 through the through hole 440.

[43] Fig. 10 is a main part perspective view illustrating a balancing means provided in a cart type bag according to a fourth embodiment of the present invention.

[44] As shown in Fig. 10, a balancing means of a cart type bag according to a fourth embodiment of the present invention includes a fixing tube 444 that is arranged at the bottom side of the mount 310 in correspondence to at least one receiving hole 443 formed in an end side of the rest 200, with a screw thread 443a formed on the inner circumference of the receiving hole 443; and a balancing tube 445 that is inserted in the fixing tube 444 with a screw thread 445a formed on the outer circumference of a leading end of the balancing tuber 445.

[45] Fig. 11 is a main part perspective view illustrating a balancing means provided in a cart type bag according to a fifth embodiment of the present invention.

[46] As shown in Fig. 11, a balancing means of a cart type bag according to a fifth embodiment of the present invention includes a pair of one side fixing members 446 that is provided on the bottom side of the rest 200, with hooking grooves formed on outer sides of the one side fixing members 446; the other side fixing member 451 that is provided in correspondence to the one side fixing member 446 and includes a fixture 448 attached on a fixing plate 447 provided on the bottom side of the mount 310, a rotating piece 449 hinged to the fixture 448, and a fixing loop 450 rotatably combined to both side of the hinged rotating piece 449; and a rotation prevention projection 452 that projects from sides of projections formed on the bottom side of the rest 200 for preventing the fixing loop 450 from seceding from the rotating piece 449.

[47] Fig. 12 is a main part perspective view illustrating a balancing means provided in a cart type bag according to a sixth embodiment of the present invention.

[48] As shown in Fig. 12, a balancing means of a cart type bag according to a sixth embodiment of the present invention includes a fixing rack 453 that is provided on the bottom side of the rest 200, with a hooking projection 453a from an outer side of the fixing rack 453; a balancing plate 454 that is formed with an insertion hole 454a in which the hooking projection 453a is inserted near an end of the balancing plate 454; a flange 455 that is provided at the bottom side of the mount 310 and is hinged with the balancing plate 454; and a rotation prevention projection 456 that projects from sides

of projections formed on the bottom side of the rest 200 for preventing the balancing plate 454 from rotating beyond the projection 456.

[49] On the other hand, as shown in Fig. 4, the cart type bag further comprises a retractable handle 500 and a pair of fixing holes 311 that is formed on the mount 310 constituting the bag movement member 300 and in which both ends of the retractable handle 500 are inserted and fixed. The length of the retractable handle 500 can be adjusted, thereby allowing a user to carry the cart type bag conveniently. The adjustment of length of the retractable handle 500 is known in the art, and therefore, explanation thereof will be omitted for the sake of avoiding complexity of description.

[50] In addition to the retractable handle 500, a fixed handle may be attached on the top side of the cart type bag.

[51] As described above, the cart type bag of the present invention may be selectively applied to a trunk type bag for crumple prevention of stored items and convenient transport and a knapsack for convenient storage.

[52] First, if the cart type bag is used as the trunk type bag, the pair of base plates 110 and 120 constituting the bottom side volume adjustment member 100 fixed on the inner bottom side of the cart type bag is balanced and fixed by the balancing means.

[53] At this time, if the bottom side volume adjustment member 100 comprises the pair of base plates 110 and 120 integrally formed and having the fold groove 130 formed therein, the pair of base plates 110 and 120 becomes flat by unfolding the fold groove 130. On the other hand, if the bottom side volume adjustment member 100 comprises the pair of base plates 110 and 120 separately formed, and interconnected and fixed by the hinge (not shown), the pair of base plates 110 and 120 becomes flat by unfolding the hinge.

[54] Here, when the balancing means that balances the bottom side volume adjustment member 100 comprises the through hole 411 formed in the side of the rest 200, and the fixing tube 412 and the balancing bar 413 that are provided in the bottom side of the mount 310, the bottom side volume adjustment member 100 becomes flat by inserting the balancing bar 413 into the fixing tube 412 through the through hole 411. At this time, since the hooking jaw 413a, which projects from the balancing bar 413, is hooked on the hooking hole 412a, which is formed in the edge of the outer bottom side of the fixing tube 412, the balancing bar 413 is prevented from being separated from the fixing tube 412.

[55] In addition, as in the first embodiment, in the balancing means that balances the bottom side volume adjustment member 100, when the fixing tube 415 and the balancing tube 416 are fixed by the operation projection 418 of the operation switch 420 provided in the receiving box 417, the operation projection 418 that fixes the fixing tube 415 and the balancing tube 416 is pushed below the fixing tube 415, and

then, the balancing tube 416 is pulled.

[56] Thereafter, an end of the pulled balancing tuber 416 is forcedly inserted into the receiving hole 414 formed in the end side of the rest 200 to balance the bottom side volume adjustment member 100. Similarly, a remaining balancing tube 416 is also forcedly inserted into a remaining receiving hole 414 formed in the other end side of the rest 200 to balance the bottom side volume adjustment member 100.

[57] In addition, for release of the balancing of the bottom side volume adjustment member 100, the balancing tube 416 forcedly inserted in the receiving hole 414 is drawn out and then is pushed in the fixing tube 415 until the drawing-out hole 415a formed in the fixing tube 415 is aligned with the connecting hole 416a formed in the balancing tuber 416.

[58] At this time, while the compressed elastic spring 419 is restored, the operation projection 418 of the operation switch 420 pressed on the inner side of the fixing tuber 415 projects outwardly through the connecting hole 416a and the drawing-out hole 415a such that the balancing tuber 416 is fixed in the fixing tube 415 to release the balancing of the bottom side volume adjustment member 100.

[59] In addition, as in the second embodiment, in the balancing means that balances the bottom side volume adjustment member 100, the balancing tube 416 is fixed in the fixing tube 415 by compression of the elastic spring 439 and the fixation of the balancing tube 416 is released by restoration of the elastic spring 439 to balance the bottom side volume adjustment member 100, similarly to the first embodiment.

[60] In the second embodiment, unlike the first embodiment, when the operation switch

438 is pulled to draw the fixing projection 438a of the operation switch 438 out of the fixing hole 436a formed on the side of the balancing tube 436 by the elastic spring 439 formed on the outer circumference of the operation switch 438, the balancing tube 416 is automatically drawn out of the fixing tube 435 while the elastic spring 437 compressed between the fixing tube 435 and the balancing tube 416 is restored by the elastic force.

[61] In addition, a guide wing 459b may be provided on the outer side of the balancing tube 436 such that the balancing tube 436 is automatically drawn out without shaking. At this time, the guide wing 459b is provided in such a manner that it is not arranged on the same line as the operation switch 438.

[62] In addition, as in the third embodiment, in the balancing means that balances the bottom side volume adjustment member 100, when the though hole 440 is formed on the side of the rest 200, the fixing hole 441a is formed on the inner side of the fixing rack 441 in correspondence to the through hole 440, and the screw thread 442a is formed on the outer circumference of the end of the balancing bar 442, the balancing bar 442 with the screw thread 442a is inserted in the fixing hole 441a through the

through hole 440.

[63] At this time, the screw thread 442a of the balancing bar 442 inserted in the fixing hole 441a engages with the screw thread 441b formed on the inner circumference of the fixing hole 441a to balance the bottom side volume adjustment member 100.

[64] In addition, as in the fourth embodiment, in the balancing means that balances the bottom side volume adjustment member 100, the bottom side volume adjustment member 100 is balanced through screw engagement, similarly to the third embodiment.

[65] In the fourth embodiment, the balancing tube 445 is inserted in the fixing tube 444 with the screw thread 445a formed on the outer circumference of the leading end of the balancing tuber 445, and the screw thread 445a is combined by screw to the receiving hole 443 formed in the end side of the rest 200.

[66] In addition, as in the fifth embodiment, in the balancing means that balances the bottom side volume adjustment member 100, when the balancing means includes the pair of one side fixing members 446 that is provided on the bottom side of the rest 200, with hooking grooves formed on outer sides of the one side fixing members 446, and the other side fixing member 451 that is provided in correspondence to the one side fixing member 446 and includes the fixture 448 attached on the fixing plate 447 provided on the bottom side of the mount 310, the rotating piece 449 hinged to the fixture 448, and the fixing loop 450 rotatably combined to both side of the hinged rotating piece 449, the rotating piece 449 is rotated such that the fixing loop 450 is hooked in the hooking groove of the one side fixing member 446, and then, the rotating piece 449 is rotated in the opposite direction such that the fixing loop 450 is fixed in the hooking groove of the one side fixing member 446 to balance the bottom side volume adjustment member 100.

[67] In addition, the fixation of the fixing loop 450 may be released according to a reverse order of the fixation. Also, as the released fixing loop 450 is mounted on the rotation prevention projection 452, it prevents the fixing loop 450 from rotating and seceding from the rotating piece 449.

[68] In addition, as in the sixth embodiment, in the balancing means that balances the bottom side volume adjustment member 100, when the balancing means includes the fixing rack 453 that is provided on the bottom side of the rest 200, with the hooking projection 453a from the outer side of the fixing rack 453, the balancing plate 454 that is formed with the insertion hole 454a in which the hooking projection 453a is inserted near an end of the balancing plate 454, and the flange 455 that is provided at the bottom side of the mount 310 and is hinged with the balancing plate 454, the insertion hole 454a formed in the balancing plate 454 passes through the hooking projection 453a projecting from the outer side of the fixing rack 453, and an edge of the insertion hole 454a is hooked in the hooking projection 453a to balance the bottom side volume

adjustment member 100.

[69] In addition, the fixation of the balancing plate 454 may be released according to a reverse order of the fixation. Also, as the released balancing plate 454 is mounted on the rotation prevention projection 456, the balancing plate 454 is prevented from rotating beyond the rotation prevention projection 456.

[70] As described above, when the cart type bag in which items (for example, clothes) are stored is carried, with the bottom side volume adjustment member 100 balanced, the stored items can be prevented from being crumpled since the cart type bag has a standardized space like the trunk type bag.

[71] In addition, in the cart type bag, the retractable handle 500 is fixed on the top side of the bag movement member 300 and the wheels 320 are attached on the bottom side of the bag movement member 300. This allows a user to carry the cart type bag conveniently.

[72] In addition, after detaching the retractable handle 500 from the cart type bag, a user can carry the cart type bag using the fixed handle attached on the top side of the cart type bag.

[73] On the other hand, if the cart type bag is used as a knapsack which can be shrunk and restored, the balancing means that balances the bottom side volume adjustment member 100 is removed from the cart type bag.

[74] In addition, the fixation of the balancing means according to the described- described embodiments is released or removed in a reverse order of the fixation procedure or in the same way as the above-described first to third embodiments, and therefore, description of which will be omitted.

[75] As described above, when the cart type bag of the present invention is stored in a moving body (airplane, vehicle, train, ship, etc) in use under the condition where the balancing of the bottom side volume adjustment member 100 is removed, the volume of the cart type bag can be adjusted depending on the extent of stored items, which leads to good space availability.

[76] Such good space availability causes increase of the number of cart type bags loaded in a container for export, which results in saving of the expenses of carriage.

[77] Fig. 13 is an exploded perspective view illustrating a cart type bag according to another embodiment of the present invention.

[78] As shown in Fig. 13, according to another embodiment of the present invention, a cart type bag, which is made of material that can be shrunk or restored depending the volume of stored items, comprises: a bottom side volume adjustment member 600 that is arranged in the inner bottom side of the bag and comprises a pair of opposite base plates 610 and 620, which are foldable or unfoldable; a rest 700 that is arranged in the outer bottom side of the bag and is fixed to one 610 of the pair of base plates 610 and

620; a bag movement member 800 that comprises a mount 810 that is arranged in the outer bottom side of the bag and is fixed to the other 620 of the pair of base plates 610 and 620 and in which a mounting space 810a having a shape corresponding to a bent external appearance of the outer bottom side of the bag is defined, and wheels 820 that are respectively fixed to both lower edges of the mount 810; and a balancing plate 900 that is detachably hooked 910 with the pair of base plates 610 and 620 to balance the pair of base plates 610 and 620 constituting the bottom side volume adjustment member 600 such that the pair of base plates 610 and 620 are not folded after the pair of base plates 610 and 620 is unfolded.

[79] Here, it is preferable that a receiving member to receive the balancing plate 900 is provided inside the cart type bag according to another embodiment of the present invention.

[80] The bottom side volume adjustment member 600 may be configured in various ways. For example, the pair of base plates 610 and 620 constituting the bottom side volume adjustment member 600 may be integrally formed and a fold groove 630 may be formed along a boundary between the pair of integrally formed base plates 610 and 620, or alternatively, the pair of base plates 610 and 620 constituting the bottom side volume adjustment member 600 may be separately formed, and interconnected and fixed by a hinge.

[81] On the other hand, the cart type bag may further comprise a retractable handle and a pair of fixing holes that is formed on the mount 810 constituting the bag movement member 800 and in which both ends of the retractable handle are inserted and fixed.

[82] In the cart type bag according to another embodiment, the same elements and operation as the cart type bag according to the earlier-described embodiments are omitted for the sake of avoiding complexity of description.

[83] The cart type bag according to another embodiment has a difference from those of the earlier-described embodiments in the balancing means to balance the bottom side volume adjustment member 600.

[84] That is, in the cart type bag according to another embodiment, the balancing plate

900 is hooked 910 with the pair of base plates 610 and 620 constituting the bottom side volume adjustment member 600 so that the bottom side volume adjustment member 600 is balanced. Industrial Applicability

[85] As apparent from the above description, the present invention provides a cart type bag whose volume can be minimized when the cart type bag is carried or stored, while keeping convenience of the cart type bag.

[86] In addition, the cart type bag of the present invention has an advantage in that it can

selectively have a function of crumple prevention of stored items, a function of convenience of transport, and a function of convenience of storage. [87]