CN109497672B

CN109497672B - Draw-bar box

Info

Publication number: CN109497672B
Application number: CN201910022114.9A
Authority: CN
Inventors: 钱国辉
Original assignee: Shanghai Tuplus Luggage Trading Co ltd
Current assignee: Shanghai Tuplus Luggage Trading Co ltd
Priority date: 2019-01-10
Filing date: 2019-01-10
Publication date: 2023-10-27
Anticipated expiration: 2039-01-10
Also published as: WO2020143123A1; CN109497672A

Abstract

The application discloses a draw-bar box which comprises a box body and a draw bar, wherein the draw bar is sequentially provided with a handle position, a pushing position and a pulling position according to different lengths of the draw bar extending from the box body, and when the draw bar is positioned at the handle position, the box body can be lifted up through the draw bar. The pull rod provided by the application has a handle position, a pushing position and a pulling position, and can be directly used as a handle when in the handle position, so that a suitcase handle is not required to be additionally assembled on a suitcase body, the design is simplified, the appearance is concise and clean, and the carrying is convenient.

Description

Draw-bar box

Technical Field

The application relates to the field of bags, in particular to a draw-bar box.

Background

The draw-bar box refers to a luggage case having a draw bar and rollers. Is widely used because of convenient use. Meanwhile, the draw-bar box is also provided with a draw bar due to the fact that the draw-bar box is provided with a single-tube draw bar and a double-tube draw bar, and the tubes of the draw bar are also provided with square tubes and round tubes, so that the draw-bar box is convenient to drag during walking, and the burden is greatly reduced. The draw-bar box can be carried by hands or dragged, wheels of the draw-bar box used at ordinary times are basically positioned at the bottom of the box, modern people design a draw-bar box with a new form, the box is designed into a cylindrical shape, the wheels are entirely wrapped outside the box, and the roller design enables the draw-bar box to be better suitable for different terrains, such as the pull of the box can easily go up and down stairs.

However, most of these draw-bar boxes are offset narrow type draw bars, which are provided on one surface of the box body, and a handle independent of the draw bars needs to be newly designed on the side of the box body to facilitate lifting of the box body.

Disclosure of Invention

The object of the present application is to provide a trolley case which solves the above-mentioned problems of the prior art.

In order to solve the above problems, according to one aspect of the present application, there is provided a draw-bar box including a box body and a draw bar having a handle position, a pushing position, and a pulling position in this order according to a length of the draw bar extending from the box body, the draw bar being capable of lifting the box body by the draw bar when the draw bar is in the handle position.

In one embodiment, the box comprises a box frame, a front panel positioned on the front surface of the box frame and a rear panel positioned on the rear surface of the box frame, the pull rod comprises a cross rod and a vertical rod, and the cross rod is positioned at the top of the box frame and the vertical rod is positioned at two sides of the box frame.

In one embodiment, the front and rear panels are detachably attached to the front and rear surfaces of the case frame.

In one embodiment, the vertical bars are located in the middle of two sides of the box frame.

In one embodiment, the housing frame includes first and second portions that are independent of each other, the first and second portions being rotatably connected by a hinge.

In one embodiment, the thickness of the first portion of the box frame is greater than the thickness of the second portion of the box frame, the pull rod is disposed on the first portion of the box frame, wherein the vertical rods are disposed on two sides of the first portion of the box frame, and the cross rod is disposed on the top of the first portion of the box frame.

In one embodiment, the tie rod is arranged such that a first length of the tie rod extending from the interior of the case is minimized when the tie rod is in the handle position.

In one embodiment, the tie rod is arranged such that a third length of the tie rod extends from within the housing when the tie rod is in the pulled position.

In one embodiment, the tie rod is arranged such that a second length of the tie rod extending from within the housing is between the first length and the third length when the tie rod is in the pushing position.

In one embodiment, the pull rod is provided with a control key, and the pull rod is positioned at the lifting handle position, the pushing position or the pulling position by operating the control key.

In one embodiment, the pull rod comprises a top cross rod and vertical rods at two sides, and the control key is arranged on the top cross rod.

In one embodiment, the control is disposed in the middle of the top rail.

In one embodiment, the control is arranged to be operated by pressing.

In one embodiment, the tie rod is arranged such that when the tie rod is not pulled from the tank, the tie rod is fully embedded within the tank.

In one embodiment, the pull rod is configured to move the pull rod to the handle position when the pull rod is not pulled out of the case, press the control key again, move the pull rod from the handle position to the pushing position, press the control key again, and pull the pull rod from the pushing position to the pulling position.

In one embodiment, the pull rod comprises a handle assembly, a transmission assembly, an inner tube, an outer tube and a gear assembly, wherein the inner tube comprises a transverse tube at the top and stand pipes at two sides, the transmission assembly is installed in the inner tube, the handle is installed outside the transverse tube at the top of the inner tube, the stand pipes at two sides of the inner tube are respectively contained in the two outer tubes, the gear assembly is installed at the bottom of the outer tube and matched with the transmission assembly, and the handle is in linkage with the transmission assembly and drives the gear assembly to move through the transmission assembly, so that the pull rod is respectively located at a handle position, a pushing position or a pulling position.

In one embodiment, the handle comprises a handle upper portion and a handle lower portion that are independent of each other, and are respectively mounted above and below the top cross tube of the inner tube and snap-fit to each other to accommodate the top riser of the inner tube inside the handle.

In one embodiment, the control is mounted in the middle of the upper portion of the handle.

In one embodiment, the transmission assembly comprises a transmission rod, a corner transmission block, a steel wire and a transmission pin, wherein the transmission rod is installed in a top transverse tube of the inner tube, the lower end of the corner transmission block is connected with the upper end of the steel wire, the upper end of the corner transmission block is matched with the end part of the transmission rod, the steel wire is installed in the inner tube and connected with the transmission pin at the lower end, and the motion of the transmission rod is transmitted to the steel wire through the corner transmission block, so that the transmission pin is driven to move.

In one embodiment, the gear component comprises a reversing piece, a positioning piece, a limiting piece and a first elastic piece, wherein the limiting piece is provided with a limiting piece installation groove along the vertical direction and a positioning piece installation groove along the horizontal direction, the reversing piece is installed in the limiting piece installation groove, the upper end of the reversing piece is in contact with the lower surface of the transmission corner block, the first elastic piece and the positioning piece are installed in the positioning piece installation groove, the first elastic piece is located at the rear of the positioning piece, and the positioning piece can protrude outwards under the action of the elastic force of the first elastic piece so as to be accommodated in holes corresponding to the handle position, the pushing position or the pulling position respectively.

In one embodiment, the outer tube is provided with holes corresponding to the handle position, the pushing position and the pulling position, respectively, and the limiting piece is matched with the different holes so that the pull rod is located at the handle position, the pushing position and the pulling position.

In one embodiment, the lower end of the reversing element is provided with a guiding inclined surface, the positioning element is provided with a reversing inclined surface matched with the guiding inclined surface, and when the reversing element moves downwards, the guiding inclined surface is matched with the reversing inclined surface so as to force the positioning element to move backwards to retract into the limiting element.

In one embodiment, the gear assembly further comprises a second elastic member and a sealing head member, the sealing head member is fixedly mounted inside the lower end of the outer tube, the upper end of the second elastic member is in contact with the limiting member and supports the limiting member, and the lower end of the second elastic member is mounted on the sealing head member.

In one embodiment, the first elastic member and the second elastic member are springs.

In one embodiment, a pull rod fixing piece is further arranged in the box body, and the pull rod fixing piece is fixedly connected with the end socket piece and fixes the bottom end of the pull rod in the box body.

The pull rod of the pull rod type suitcase has a handle position, a pushing position and a pulling position, and the pull rod can be directly used as the handle when in the handle position, so that the suitcase body does not need to be additionally provided with a suitcase handle, the design is simplified, the weight and the cost are saved, the pushing of the suitcase body is facilitated when in the pushing position, and the suitcase is conveniently pulled when in the three-stage position.

In addition, because the montants of pull rod set up in the both sides of box frame (this kind of setting makes the pull rod compare with the pull rod of ordinary draw-bar box, and therefore the distance between the two montants of pull rod appears wider, so called wide pull rod), the horizontal pole of pull rod sets up in the top of frame and the horizontal pole imbeds the box the inside completely when the pull rod does not pull out, can realize pure flat top, and the top can be used for placing notebook operation this moment, and the user also can sit at the box top, sits very comfortable.

Secondly, because the montant of pull rod sets up in box frame both sides, can let the case the inside, two faces are pure flat, consequently, the pull rod can not occupy the effective utilization space of box to can practice thrift a lot of inner spaces (traditional pull rod can invade and occupy a lot of back spaces), make the usage space in the box bigger, be convenient for deposit more article.

And in the using process of the wide draw bar, for example, the draw bar box is required to be carried along with a stair and the like, so that the arm can be put in, the lifting operation is convenient, and the physical strength is saved.

Finally, the inner tube of the wide pull rod is an integrated bent tube and cannot be broken, while the traditional pull rod is formed by connecting two tubes through a cross beam and is easy to break.

Drawings

FIGS. 1-3 are front views of the draw-bar box of the present application, wherein FIG. 1 shows the draw bar in a handle position, FIG. 2 shows the draw bar in a push position, and FIG. 3 shows the draw bar in a pull position;

FIG. 4 is a side view of the draw-bar box of the present application;

FIG. 5 shows a perspective view of the draw-bar box;

FIG. 6 shows a perspective view of the box body of the draw-bar box of FIG. 5, wherein the draw bar has been removed;

FIG. 7 shows a further perspective view of the draw-bar box, wherein the draw bar is not pulled up;

FIG. 8 illustrates an exploded perspective view of a trolley case in one embodiment of the present application;

FIG. 9 is a perspective view of the tie rod;

FIG. 10 is a cross-sectional view of the tie rod;

fig. 11 is an enlarged view of a portion E of fig. 10;

FIG. 12 is an exploded perspective view of the tie rod;

FIG. 13 is a front view of the draw-bar box;

FIG. 14 is a cross-sectional view taken along line A-A of FIG. 13; and

fig. 15 is a sectional view taken along line K-K of fig. 13.

Detailed Description

The preferred embodiments of the present application will be described in detail below with reference to the attached drawings, so that the objects, features and advantages of the present application will be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the application, but rather are merely illustrative of the true spirit of the application.

In the following description, for the purposes of explanation of various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that an embodiment may be practiced without one or more of the specific details. In other instances, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the following description, for the purposes of clarity of presentation of the structure and manner of operation of the present application, the description will be made with the aid of directional terms, but such terms as "forward," "rearward," "left," "right," "outward," "inner," "outward," "inward," "upper," "lower," etc. are to be construed as convenience, and are not to be limiting.

Fig. 1-3 are front views of the draw-bar box 100 of the present application showing the draw bar in the handle position, pushing position and pulling position, respectively, and fig. 4 is a side view of the draw-bar box 100 of the present application. As shown in fig. 1 to 4, the draw-bar box 100 includes a box body 20 and a draw bar 10, and the draw bar has a handle position a, a pushing position B and a pulling position C in order according to the length of the draw bar 10 extending from the box body 20, and when the draw bar 10 is at the handle position a, the box body 20 can be lifted up by the draw bar 10.

When the pull rod 10 is in the handle position a, the first length of the pull rod 10 extending from the interior of the housing 20 is the shortest. When the pull rod 10 is in the pull position C, the third length of the pull rod 10 extending from the inside of the case 20 is longest. When the pull rod 10 is in the pushing position B, the second length of the pull rod 10 protruding from the inside of the case 20 is located between the first length and the third length.

Fig. 5 shows a perspective view of the draw-bar box 100, fig. 6 shows a perspective view of the box body 20 of the draw-bar box of fig. 5, in which the draw bar has been detached, fig. 7 shows a further perspective view of the draw-bar box 100, in which the draw bar box 100 is not pulled up, as shown in fig. 5 to 7, the draw-bar box 100 includes a frame 21 located at the periphery and a front panel 22 located at the front surface of the box frame 21 and a rear panel 23 located at the rear surface of the box frame 21, the front panel 22 and the rear panel 23 being enclosed into the box body 20. The tie rod 10 includes a cross bar 12 and a vertical bar 11, the cross bar 12 being located at the top of the case frame 21 and the vertical bar 11 being located at both sides of the case frame 21. As is clear from fig. 5, the tie rod of the present application is much longer than a conventional tie rod case, and has a cross bar that is approximately the same width as the case, and thus is also called a wide tie rod.

As shown in fig. 6-7, a groove 23 is provided at the top of the frame, and when the draw bar 10 is not pulled out, the cross bar 12 is embedded in the groove 23, and the draw bar 10 and the case 20 are combined into a whole from the surface, so that the whole draw bar case has a very simple appearance.

Fig. 8 shows an exploded perspective view of the draw-bar box 100A in one embodiment of the present application, in which the front panel 22 and the rear panel 23 are detachably attached to the front and rear surfaces of the box frame 21 in the embodiment shown in fig. 8. The mode is convenient for replacing the panel of the box body, and a user can replace the panels with different colors according to personal preference.

With continued reference to fig. 1-8, as a preferred form, the vertical rods 11 of the tie rod 10 are located in the middle of the sides of the box frame 21. So configured, the draw-bar box 100 is conveniently lifted when the draw bar 10 is at the handle position, and the balance of the box is conveniently maintained when lifting because the draw bar 10 is at the middle of the box frame.

In one embodiment, the case frame 21 includes a first portion (i.e., a case body) and a second portion (i.e., a case cover) that are independent of each other, and the first portion and the second portion are rotatably connected by a hinge. Wherein, the thickness of first part is greater than the thickness of box frame second part, and the pull rod sets up on the first part of box frame 21 (i.e. box main part), and wherein, the montant sets up in the both sides of the first part of box frame 21, and the horizontal pole sets up in the top of first part.

As shown in fig. 5, a control key 121 is provided in the middle of the pull rod 12, and the control key 121 is operated so that the pull rod is in the handle position a, the pushing position B, or the pulling position C. Although the control 121 is shown in the middle of the rail 12, those skilled in the art will appreciate that the control may be located in other positions on the tie rod. In the illustrated embodiment, the control key 121 is operated by pressing. When the tie rod 10 is not pulled out from the case 20, the tie rod 10 is completely embedded in the case 20.

When the pull rod 10 is not pulled out from the case 20, the control key 121 is pressed, the pull rod can be moved to the handle position a, the control key 121 is pressed again, the pull rod 12 can be moved from the handle position a to the pushing position B, and the control key 121 is pressed again, so that the pull rod can be moved from the pushing position B to the pushing position C.

The pull rod 10 of the present application is described below with reference to fig. 9-12. Fig. 9 is a perspective view of the tie rod 10, fig. 10 is a cross-sectional view of the tie rod 10, fig. 11 is an enlarged view of a portion E of fig. 10, and fig. 12 is an exploded perspective view of the tie rod 10. As shown in fig. 9 to 11, the pull rod 10 includes a handle assembly 13, a transmission assembly 14, an inner tube 15, an outer tube 16 and a gear assembly 15, the inner tube 15 includes an integrally formed top cross tube 151 and two side risers 152, the transmission assembly 14 is installed in the inner tube 15, the handle 13 is installed outside the top cross tube 151 of the inner tube 15, the risers 152 on two sides of the inner tube 15 are respectively accommodated in the two outer tubes 16, the gear assembly 15 is installed at the bottom of the outer tube 16 and cooperates with the transmission assembly 14, and the handle 13 is linked with the transmission assembly 14 and drives the gear assembly 15 to move through the transmission assembly 14, so that the pull rod 10 is respectively located at a handle position, a pushing position or a pulling position. Because the inner tube 15 is an integrated bent tube, the broken tube is not easy to break, and the traditional pull rod is easy to break when two tubes are connected through a beam.

Specifically, the handle 13 includes a handle upper portion 131 and a handle lower portion 132, and the handle upper portion 131 and the handle lower portion 132 are respectively mounted above and below the top cross tube 151 of the inner tube 15, and are fastened to each other so as to accommodate the top cross tube 151 of the inner tube 15 inside the handle 13. The control key 17 is installed at the middle of the handle, specifically, the middle of the upper portion 131 of the handle is provided with a control key groove (not shown), and the control key 17 is accommodated in the control key groove.

The transmission assembly 14 comprises a transmission rod 141, a corner transmission block 142, a steel wire 143 and a transmission pin 144, wherein the transmission rod 141 is installed in a top transverse tube 151 of the inner tube 15, the lower end of the corner transmission block 142 is connected with the upper end of the steel wire, the upper end of the corner transmission block 142 is matched with the end part of the transmission rod 141, the steel wire 143 is installed in a vertical tube 152 of the inner tube 15 and is connected with the transmission pin 144 at the lower end, and the motion of the transmission rod 141 is transmitted to the steel wire 143 through the corner transmission block 142, so that the transmission pin 144 is driven to move.

The outer tube 16 is provided with holes 161, 162, 163 and 164 corresponding to the unextended position, the handle position, the pushing position and the pulling position of the pull rod respectively from bottom to top, and the positioning member 152 of the gear assembly 15 is respectively matched with the holes 161, 162, 163 and 164 so that the pull rod is positioned at the unextended position, the handle position, the pushing position and the pulling position.

The gear assembly 15 includes a reversing member 151, a positioning member 152, a limiting member 153, and a first elastic member 154, where the limiting member 153 is provided with a limiting member mounting groove 1531 along a vertical direction and a positioning member mounting groove 1532 along a horizontal direction, the reversing member 151 is mounted in the limiting member mounting groove 1531, and an upper end of the reversing member 151 contacts with a lower surface of the transmission corner block 144, the first elastic member 154 and the positioning member 152 are mounted in the positioning member mounting groove 1532, and the first elastic member 154 is located behind the positioning member 152, and the positioning member 152 can protrude outside the limiting member 153 under the elastic force of the first elastic member 154 so as to be accommodated in the holes 161, 162, 163, 164 of the outer tube 16 corresponding to the unextended position, the handle position, the pushing position, or the pulling position, respectively.

The lower end of the reversing member 151 is provided with a guide slope 1511, and the positioning member 152 is provided with a reversing slope 1521 engaged with the guide slope, and when the reversing member 151 moves downward, the guide slope 1511 engages with the reversing slope 1521 to force the positioning member 152 to move backward to retreat into the inside of the limiting member 153.

The gear assembly 15 further includes a second elastic member 155 and a sealing member 156, the sealing member 156 is fixedly installed inside the lower end of the outer tube 16, the upper end of the second elastic member 155 contacts with the bottom surface of the limiting member 153 and supports the limiting member 153, and the lower end of the second elastic member 155 is installed on the sealing member 156. Specifically, the end face of the seal member 156 is provided with a protrusion 1561, and the second elastic member 155 is mounted on the protrusion 1561.

With continued reference to fig. 10-11, the reversing member 151 is provided with a guide groove 1513 extending in the vertical direction, the guide groove 1513 is mounted in the reversing member mounting groove 1531 of the limiting member 153 by a pin 1514, and the reversing member 151 is slidable up and down along the pin 1514. The side of the reversing member 151 is provided with a limit step 1512, and the limit step 1512 is matched with a baffle 1533 in the limiting member 153, so that the reversing member 151 can only perform a certain distance of vertical movement in the limiting member 153, and the travel of the movement is the depth of the guide groove 1531.

The front end of the positioning member 152 is provided with a protrusion 1522, and the protrusion 1522 is sized to mate with the holes 161, 162, 163, 164 in the outer tube 16 corresponding to the non-extended position, the handle position, the pushing position, and the pulling position of the tie rod, so as to be able to enter the corresponding holes 161, 162, 163, 164 under the drive of the first elastic member 154.

Fig. 13 to 15 show the connection state of the tie rod 10 and the case 20. Fig. 13 is a front view of the draw-bar box 100, fig. 14 is a sectional view taken along a line A-A of fig. 13, and fig. 15 is a sectional view taken along a line K-K of fig. 13. As shown in fig. 13 to 15, the tie rod 10 is fixed in the case 20 by the screw 31 at the upper portion and the screw 32 at the lower portion, respectively, wherein the upper screw 31 fixes the tie rod by fixing the outer tube 16 in the case and the lower screw 32 fixes the tie rod by fixing the fixing member 157 in the case.

When the pull rod is in the non-extended position, the protruding part 1522 of the positioning member 152 is accommodated in the first hole 161 on the outer tube 16, when the pull rod is required to be pulled out to the handle position, the control key 17 is pressed, the transmission rod 141 is driven to move downwards, the transmission rod 144 is transmitted to the transmission foot 144 through the steel wire 143, the transmission foot 144 presses the reversing member 151 downwards, the reversing member 151 moves downwards and is forced to move backwards against the elastic force of the first elastic member 154 by the contact of the guiding inclined surface 1511 and the reversing inclined surface 1521, the reversing member 152 is withdrawn from the first hole 161 and retracted into the limiting member 153, at the moment, the whole limiting member moves upwards under the upward elastic force of the second elastic member 155, and pushes the inner tube 15 to move upwards until the protruding part 1522 of the reversing member 152 moves to the second hole 162 of the outer tube 16 corresponding to the handle position, at the moment, the protruding part 1522 extends into the second hole 162 to limit, the pull rod is in the handle position, at the moment, the upward movement of the reversing member cannot be continued, and the handle 13 is held, and the handle box 100 can be lifted.

When the draw-bar box needs to be pushed, the control key 17 is pushed again, the transmission rod 141 is driven to move downwards, the movement is transmitted to the transmission foot 144 through the steel wire 143, the transmission foot 144 presses the reversing piece 151 downwards, the reversing piece 151 moves downwards and forces the reversing piece 152 to move backwards against the elastic force of the first elastic piece 154 through the contact of the guide inclined surface 1511 and the reversing inclined surface 1521, the reversing piece is withdrawn from the second hole 161 and retreated into the limiting piece 153, at the moment, the handle can be pulled upwards to enable the draw-bar to continue to move upwards until the protruding part 1522 of the reversing piece 152 moves to the third hole 163 of the outer tube 16 corresponding to the pushing position, at the moment, the protruding part 1522 stretches into the third hole 163 to be limited, and the draw-bar is in the pulling position, and can not move upwards any more, at the moment, the draw-bar box is pushed conveniently. A step of

When the pull rod is required to be changed to the pulling position, the operation method and the principle are the same as the above method, and the description is omitted here.

Furthermore, as is apparent from the above description, in the present embodiment, the top rail 12 of the tie rod 10 includes the handle 13, the drive rod 141, the corner drive block 142, and the top cross tube 151 of the inner tube 15, while the vertical rod 11 includes, in extension, the standpipe 152 of the inner tube 15, the outer tube 16, and the portions accommodated within the outer tube 16 and standpipe 152.

As a preferred solution, the first elastic member and the second elastic member in the above embodiment may be springs. However, those skilled in the art will appreciate that other elastic means commonly used in the art may be used for the first and second elastic members.

The pull rod type luggage case is characterized in that the vertical rods of the pull rod are arranged on two sides of the case frame, the pull rod is provided with the handle position, the pushing position and the pulling position, and the pull rod can be directly used as the handle when in the handle position, so that the case body does not need to be additionally provided with the handle of the luggage case, the design is simplified, meanwhile, the pushing of the case body is facilitated at the pushing position, and the luggage case is conveniently pulled at the three-stage position.

While the preferred embodiments of the present application have been described in detail, it will be appreciated that those skilled in the art, upon reading the above teachings, may make various changes and modifications to the application. Such equivalents are also intended to fall within the scope of the application as defined by the following claims.

Claims

1. The draw-bar box comprises a box body and a draw bar, and is characterized in that the draw bar sequentially comprises a handle position, a pushing position and a pulling position according to different lengths of the draw bar extending out of the box body, and when the draw bar is positioned at the handle position, the box body can be lifted by the draw bar;

the pull rod is provided with a control key, and the pull rod is positioned at the lifting handle position, the pushing position or the pulling position by operating the control key;

the pull rod comprises a handle assembly, a transmission assembly, an inner pipe, an outer pipe and a gear assembly, wherein the inner pipe comprises a transverse pipe at the top and vertical pipes at two sides, the transmission assembly is installed in the inner pipe, the transmission assembly comprises a transmission rod, a corner transmission block, a steel wire and transmission pins, the handle is installed outside the transverse pipe at the top of the inner pipe, the vertical pipes at two sides of the inner pipe are respectively contained in the two outer pipes, the gear assembly is installed at the bottom of the outer pipe and matched with the transmission assembly, and the handle is in linkage with the transmission assembly and drives the gear assembly to move through the transmission assembly, so that the pull rod is respectively located in a handle position, a pushing position or a pulling position;

the gear assembly comprises a reversing piece, a positioning piece, a limiting piece and a first elastic piece, wherein a limiting piece mounting groove is formed in the limiting piece along the vertical direction, a positioning piece mounting groove is formed in the limiting piece along the horizontal direction, the reversing piece is mounted in the limiting piece mounting groove, the upper end of the reversing piece is in contact with the lower surface of the transmission foot, the first elastic piece and the positioning piece are mounted in the positioning piece mounting groove, the first elastic piece is positioned at the rear of the positioning piece, and the positioning piece can protrude outwards of the limiting piece under the action of elasticity of the first elastic piece so as to be accommodated in holes corresponding to the handle position, the pushing position or the pulling position respectively;

the outer tube is provided with holes corresponding to the handle position, the pushing position and the pulling position respectively, and the limiting piece is matched with the different holes so that the pull rod is positioned at the handle position, the pushing position and the pulling position;

the lower end of the reversing piece is provided with a guide inclined plane, the positioning piece is provided with a reversing inclined plane matched with the guide inclined plane, and when the reversing piece moves downwards, the guide inclined plane is matched with the reversing inclined plane so as to force the positioning piece to move backwards and retract into the limiting piece;

the gear assembly further comprises a sealing head part and a second elastic part, the sealing head part is fixedly arranged in the lower end of the outer tube, the upper end of the second elastic part is in contact with the limiting part and supports the limiting part, the lower end of the second elastic part is arranged on the sealing head part, when the pull rod is in an unextended position, the control key is operated, and the elastic force of the second elastic part enables the pull rod to be in the handle position.

2. The draw-bar box of claim 1, wherein the box body comprises a box body frame, a front panel positioned on the front surface of the box body frame and a rear panel positioned on the rear surface of the box body frame, the draw bar comprises a cross bar and a vertical bar, the cross bar is positioned on the top of the box body frame, and the vertical bar is positioned on two sides of the box body frame.

3. A trolley case according to claim 2, wherein the front and rear panels are detachably attached to the front and rear surfaces of the case frame.

4. A trolley case according to claim 2, wherein the vertical bars are located in the middle of both sides of the case frame.

5. A trolley case according to claim 2, wherein the case frame comprises a first portion and a second portion that are independent of each other, the first portion and the second portion being rotatably connected by a hinge.

6. The draw-bar box of claim 5, wherein the thickness of the first portion of the box frame is greater than the thickness of the second portion of the box frame, the draw bar being disposed on the first portion of the box frame, wherein the vertical bars are disposed on both sides of the first portion of the box frame, and the cross bars are disposed on top of the first portion of the box frame.

7. A draw-bar box according to claim 1, wherein the draw bar is arranged such that the first length of the draw bar extending from the box body is shortest when the draw bar is in the handle position.

8. A draw-bar box according to claim 7, wherein the draw bar is arranged such that the third length of the draw bar extending from the box body is longest when the draw bar is in the pulled position.

9. A draw-bar box according to claim 8, wherein the draw bar is arranged such that when the draw bar is in the pushing position, a second length of the draw bar extending from within the box is between the first length and the third length.

10. The draw-bar box of claim 1, wherein the draw bar includes a top cross bar and vertical bars on both sides, the control key being disposed on the top cross bar.

11. The trolley case of claim 10 wherein the control key is disposed in a middle portion of the top rail.

12. A trolley case according to claim 1, wherein the control key is arranged to be operated by pressing.

13. A draw-bar box according to claim 1, wherein the draw bar is arranged such that it is fully embedded in the box when the draw bar is not pulled out of the box.

14. A draw-bar box according to claim 1, wherein the draw bar is arranged such that when the draw bar is not pulled out of the box body, the control key is pressed, the draw bar is moved to the handle position, the control key is pressed again, the draw bar is moved from the handle position to the pushing position, the control key is pressed again, and the draw bar is pulled from the pushing position to the pushing position.

15. The trolley case of claim 1 wherein the handle includes a handle upper portion and a handle lower portion that are independent of each other, the handle upper portion and handle lower portion being mounted above and below the top cross tube of the inner tube, respectively, and snap together to receive the top riser of the inner tube within the handle.

16. The trolley case of claim 15 wherein the control key is mounted in a middle portion of the upper portion of the handle.

17. The draw-bar box according to claim 1, wherein the transmission rod is installed in a top transverse tube of the inner tube, the lower end of the corner transmission block is connected with the upper end of the steel wire, the upper end of the corner transmission block is matched with the end part of the transmission rod, the steel wire is installed in the inner tube and is connected with the transmission leg at the lower end, and the motion of the transmission rod is transmitted to the steel wire through the corner transmission block, so that the transmission leg is driven to move.

18. The trolley case of claim 1 wherein the first resilient member and the second resilient member are springs.

19. The draw-bar box according to claim 1, wherein a draw-bar fixing member is further provided in the box body, and the draw-bar fixing member is fixedly connected with the head member and fixes the bottom end of the draw bar in the box body.