KR20030033208A - rear body for a truck - Google Patents

Abstract

PURPOSE: A tray of a cargo vehicle is provided to fold both side and rear portions of the vehicle to load and unload cargos and to cover an upper space of the vehicle by a folded roof. CONSTITUTION: A tray of a cargo vehicle includes side gates(5); a tail gate and a roof(9). Side gates comprise a fixed panel(13) and movable panels(15,17). The fixed panel is hinged(11) to a vehicle body(3). Folded movable panels are received inside the fixed panel. Movable panels are spread or folded from the fixed panel by a panel driving device. Side gates are formed to both sides of the vehicle body. The tail gate comprises a fixed tail panel and movable tail panels. The fixed tail panel is hinged to the vehicle body. Folded movable tail panels are received inside the fixed tail panel. Movable tail panels are spread or folded from the fixed tail panel by the panel driving device. The tail gate forms a wall on a rear upper portion of the vehicle body. A roof comprises roof panels(71). Roof panels are received inside a roof housing(77). The roof housing is arranged to an upper portion of an operator cab. Roof panels are spread and folded from the roof housing by a roof driving device. The roof covers the vehicle body. Thereby, a space separate from the upper portion of the vehicle body is formed. Cargos are unloaded from left, right and rear sides of the vehicle body.

Description

Loading box for cargo vehicles {rear body for a truck}

The present invention relates to a loading box for a cargo vehicle, and more particularly, to a loading box for a cargo vehicle in which a wall that separates the storage box from the outside in the form of a box is improved in a collapsible structure.

The cargo box of the cargo vehicle is capable of opening both sides and rear walls to facilitate cargo loading and unloading operations. However, this structure does not protect the loaded cargo from snow, and does not completely prevent the cargo from falling out of the vehicle during transportation, so the preference of the so-called box vehicle, which can seal the cargo box completely from the outside, increases. have.

The box vehicles known so far are known as the cabinet type which is opened only to the rear side and the wing body type which is opened to both sides. The electronic cabinet type has the advantages of low manufacturing cost and perfect cargo protection. However, workability is not good because the cargo must be loaded and lowered only to the rear side. On the other hand, the latter wing body type has the advantage of satisfying both cargo protection and workability, but it is used only for large cargo vehicles because of its high manufacturing cost, and is not used for small cargo vehicles of less than 1 ton.

The present invention is to solve the conventional problems as described above, the object is to enable the foldable walls located on both sides and rear so that cargo can be loaded and unloaded through the side and rear of the vehicle body and the vehicle body formed by these walls It is to provide a loading box for a cargo vehicle configured to cover the upper space by the folding roof.

In order to achieve the object of the present invention, the present invention, in loading a cargo vehicle having a space for loading cargo on the upper part of the vehicle body behind the cab, the shape of the cross section is the same in size and the inside of the fixed panel connected to the vehicle body by the hinge A plurality of movable panels which are different from each other and overlapping with each other, the movable panel being deployed or collapsible from the fixed panel by the panel driving means to form opposing walls on both upper sides of the vehicle body; And a plurality of movable tail panels having the same cross-sectional shape and different sizes are overlapped and stored inside the fixed tail panel hinged to the vehicle body, and the movable tail panel is unfolded or folded from the fixed panel by another panel driving means. A tail gate possibly arranged to form a wall on an upper rear side of the vehicle body; In addition, a plurality of roof panels having the same cross-sectional shape and different sizes are overlapped and accommodated in the roof housing disposed at the upper part of the vehicle cab, and the roof panel is deployed from the roof housing or foldable by the roof driving means so that A loop forming a cover; It provides a loading box for a cargo vehicle comprising a.

The means for driving the panel in the cargo box for cargo vehicles according to the present invention is to drive the movable panel of the side gate and the movable tail panel of the tail gate by rotating a screw overlapping several by the motor and to effectively transmit and control the power of the motor. To this end, an engagement clutch is installed between the motor and the screw, and the power is transmitted between the motor and the engagement clutch by a bevel gear.

These screws are cylindrical and each screw is formed on the inner circumferential surface of the female screw and the outer circumference of the male screw is formed so that the small diameter screw is inserted into the large diameter screw is screwed. A shaft support bracket is rotatably fixed to the end of each screw to be moved, and a fixed arm is coupled to the shaft support bracket, and the end of the fixed arm is coupled to the movable panel or the movable tail panel so that the screw is rotated. Each movable panel coupled thereto is lifted. In addition, each screw that is moved has a diameter larger than that of the main body, so that the inserted screw acts as a stopper so that the inserted screw does not escape from the screw holding it.

And the cargo box for the cargo vehicle according to the present invention is formed on both sides of the cab side of the vehicle body is guided in the vertical direction of the "⊂" shape to serve to guide the smooth movement when the movable panel of the side gate. In addition, the rear side of both side gates to form a protrusion extending in the direction perpendicular to the longitudinal direction serves to guide the smooth movement when both cross-sections of the tail gate is elevated. As such, when the tail gate moves up and down along the side gate, a latch is installed on the uppermost movable tail panel of the tail gate so that the raised tail gate is fixed to the side gate, and the catch of the end of the latch can be inserted into the corresponding part of the side gate. Form a groove.

Means for driving the roof in the cargo box for cargo vehicles according to the present invention is to install the motor in the roof housing and to drive each roof panel while rotating a number of screws transmitted by the power of the motor, such drive means for driving the panel The means and the mechanism are the same. In addition to the loop drive means by screws, the present invention provides a winch and a rope and another embodiment consisting of a plurality of beams that are sequentially moved along the rope and can be deployed / folded in each roof panel.

And in the loading box for cargo vehicles according to the present invention to form a rain dam for guiding the flow of rain on the upper side of each roof panel to prevent rain water penetrates into the inside of the loading box. In addition, rollers are attached to the bottom surface of both sides of each roof panel, and roller guiders are formed on the upper side of the movable panel at the top of the side gate corresponding to the position at which the rollers move so that the roof panels can move smoothly when the roof panels are unfolded.

As described above, the cargo box for the cargo vehicle of the present invention forms side gates and tail gates as a plurality of foldable panels and is developed / folded with a suitable power source, thereby providing a loading space that is isolated from the outside, but unlike both sides of the stacker. It can be opened in either direction, behind the room, making it easy to load and unload cargo.

1 is a partial cross-sectional view of the side of the cargo box for cargo vehicles according to the present invention.

2 is a partial cross-sectional view of the rear of the loading box.

3 is a longitudinal sectional view depicting a linkage structure of screws for elevating side gates and tail gates;

4 is a cross-sectional view taken along the line A-A of FIG.

5 is a cross-sectional view taken along the line B-B in FIG.

6 is a longitudinal sectional view of the first embodiment of the loop entry and exit means;

7 is a cross-sectional view of the loop guide.

8A and 8B are diagrams illustrating the rising process of side and tail gates.

9A, 9B and 9C are diagrams illustrating the withdrawal process of loops.

10 is a plan view of a second embodiment of a loop entry and exit means;

11 is a longitudinal sectional view of FIG. 10;

12 is a cross-sectional view of the roof panel folded by the loop entry and exit ladder.

* Description of the symbols for the main parts of the drawings *

1: Cab 5, 5: Side gate

7: tail gate 9: loop

13: fixed panel 15, 17: movable panel

19: fixed tail panel 21, 23: movable tail panel

25,79: Motor 27,81: Output side bevel gear

29,83: driven bevel gear 31: internal tooth screw

33: internal and external tooth screw 35,91: external tooth screw

37,41,93,97,101: Female thread 39,43,95,99,103: Male thread

53,55,117,119,121: Axial support bracket 57,59: Fixed arm

61, 61: guider 67: latch

69,69: latching grooves 71, 73, 75: first to third roof panels

77: roof housing 81,83: bevel gear

85: fixed internal tooth screw 87,89: first and second internal tooth screw

125: roller 127: roller guider

129: winch 131,133: drum

135,137,139,141: 1st to 4th beam 143,145: rope

1 is a partial cross-sectional view of the side of the loading box for cargo vehicles according to the present invention, Figure 2 is a partial cross-sectional view of the rear of the loading box, the side gates 5 on both sides that partition the upper portion of the vehicle body 3 extending from the cab 1 from the outside. And 5) and the tailgate 7 on the rear side and the loop 9 sealing the upper side thereof.

First, referring to FIG. 1, the side gates 5 and 5 are coupled to the vehicle body 3 so that they can be opened and closed laterally by the hinges 11 and 11. It is composed of a fixed panel 13 and a plurality of movable panels (15, 17) are formed to be differently manufactured to be stored sequentially.

In more detail, the fixed panel 13 has the largest length and width so that the first movable panel 15 can be accommodated therein, and the first movable panel 15 has a second movable therein. The panel 17 is manufactured to a size that can accommodate the panel 17. Accordingly, when the side kits 5 and 5 are opened to the side, the two panels 15 and 17 are folded into the fixed panel 11 while being accommodated.

2, the rear tail gate 7 also has the same structure as the side gates 5 and 5, that is, one fixed tail panel 19 and two movable tail panels 21 and 23. It consists of two movable tail panels (21, 23) in the fixed tail panel 19 is stored in the state can be folded at a time.

The two panels 15 and 17 housed in the fixed panel 13 shown in FIG. 1 are an output side bevel gear 27 of a motor 25 installed below the vehicle body 3 and a driven bevel gear 29 engaged with it. Receives power from) can be moved up and down. The driven bevel gear 29 is provided so that mutual connection is possible through the internal tooth screw 31 and the engagement clutch 32, and the internal tooth screw 31 is centered in the center of the internal tooth screw 31. As shown in FIG. (33) is inserted and screwed, while the outer tooth screw 35 is also inserted and screwed in the center of the inner and outer tooth screw 33, ultimately, three screws (in conjunction with the forward and reverse driving of the motor 25) 31, 33, 35 are configured to rotate in conjunction with. Here, although the bevel gear is used as a power transmission means between the motor 25 and the engagement clutch 32, in addition to the bevel gear, a mechanism capable of power transmission, such as a belt or a chain, may also be used. In addition, when the engagement clutch 32 is installed between the motor 25 and the screws 31, 33, 35, the motor 25 and the bevel gear are fixed to the vehicle body, and the screws 31, 33, 35 are mounted on the panel 13; This is to transfer the power transmitted to the bevel gear to the screw through the clutch only when the panels 13, 15 and 17 are closed because they move together in accordance with the movement of .15 and 17.

3 illustrates a power transmission system leading from the motor 25 to the external screw 35 described above. The internal tooth screw 31 which receives the power of the motor 25 via the engagement clutch 32 has an internal thread 37 formed on the inner circumferential surface of the distal end portion, and the internal and external tooth screw 33 on the internal thread 37. The male screw 39 of the outer circumferential surface of the screw is screwed, and the female screw 41 is also formed on the inner circumferential surface of the terminal side of the inner and outer tooth screw 33, so that the male screw 43 of the outer tooth screw 35 is formed on the female screw 41. Is screwed in. In addition, stoppers 45 and 47 formed with a larger diameter than the respective main bodies are formed at the end of the inner and outer tooth screws 33 and the root portion of the outer tooth screw 35 so that the respective screws 31, 33 and 35 rotate to the end. Even if they are not separated from each other. By this configuration, the forward and reverse rotation of the motor 25 can be extended or contracted by interlocking the three screws 31, 33, 35.

Although the inner tooth screw 31 is rotatably supported inside the fixing panel 13 as shown in FIG. 1, the inner and outer tooth screws 33 and the outer tooth screw 35 have their respective axial support brackets 53, 55). These axial support brackets 53 and 55 rotatably support the ends of the corresponding inner and outer tooth screws 33 and the outer tooth screw 35, and at the same time, the first fixing arms 57 and the second extending arms. It is coupled to the lower ends of the first movable panel 15 and the second movable panel 17 corresponding to each other via the fixing arm 59 to extend / contract the inner and outer tooth screws 33 and the outer tooth screws 35. In synchronism, both movable panels 15 and 17 rise out of the fixed panel 13 or are stored therein. Although not shown in the drawing, the upper and lower sides of the fixed panel 13 and the first movable panel 15 A groove having a long length, which is a moving space of each fixed arm, is formed so that the first fixed arm 57 and the second fixed arm 59 can move up and down. In addition, the shaft support bracket 55 fixed to the end of the outer tooth screw 35 is coupled to the upper surface of the second movable panel 17.

On the other hand, guiders 61 and 61 are provided on both sides of the rear of the cab 1 in the vertical direction, so that the movable panels 15 and 17 can fold stably along the guiders 61 and 61. do. That is, both the guiders 61 and 61 have a U-shaped cross section as shown in Fig. 4, so that the lifting operation is performed stably as both movable panels 15 and 17 are moved in the interior thereof. .

This guiding action is also necessary for the relationship between the side gates 5 and 5 and the tail gate 7. The present invention provides a fixed panel 13 constituting both side side gates (5, 5) and protrusions (63, 63) extending perpendicular to both movable panels (15, 17), as shown in FIG. The end portions of the fixed tail panel 19 of the tail gate 7 and the movable tail panels 21 and 23 are brought into close contact with each other to prevent the gap therebetween.

In addition, in order to prevent the tail gate 7 from opening to the rear side after being deployed, as shown in FIG. 2, elastic members 65 and 65 are provided at both ends of the inner side of the second movable tail panel 23. While the clasps 67 and 67 are fixed to one end of the 65 and 65 so as to be movable left and right, the corresponding grooves of the side gates 5 and 5 facing the clasps 67 and 67 are engaged with the locking grooves 69 69) is formed.

In such a clasp structure, both clasps 67 and 67 are formed to be inclined toward the bottom surface of the part caught by the side gates 5 and 5, so that the clasps 67 and 67 are lowered when the second movable tail panel 23 descends. The second movable tail panel 23 is accommodated inside the fixed tail panel 19 by being offset from the locking grooves 69 and 69 and moved toward the center of the tail by the compressive force of the elastic member 65. When the movable tail panel 23 is raised, the clasps 67 and 67 meet the catching grooves 69 and 69 and move toward the side gates 5 and 5 by the tension force of the elastic member 65 so that the clasps 67, 67 is fitted into the locking grooves (69, 69). The tail gate 7 is automatically fixed to the side gates 5 and 5 by the compression tensioning action of the clasps 67 and 67.

On the other hand, the upper roof 9 is installed in the upper part of the cab 1, and this loop 9 also has a proper number of panels, for example, three roof panels 71 and 73, depending on the length of the vehicle body 3. , 75). The roof panel has a structure in which all panels operate unlike the side gates 5 and 5 and the tail gate 7 described above.

The three roof panels, that is, the first to third roof panels 71, 73, and 75 are all stored and stored in the roof housing 77, are sequentially arranged to be accessible, and then the roof housing may be separated by a separate power source. 77 is installed to be accessible from.

As the power source for operating the first to third roof panels 71, 73, and 75, various structures may be applied.

One embodiment is described with reference to FIG. 1 as follows. The power source of the roof panel described below has a structure similar to that of the side gates 5 and 5 and the tail gate 7 described above. That is, the power source of the roof panel is fixedly arranged concentrically to the output side bevel gear 81 that rotates by the rotational force generated from the motor 79, the driven bevel gear 83 and the driven bevel gear 83 meshed with and interlocked thereto. It consists of the internal tooth screw 85, the 1st and 2nd internal and external tooth screws 87 and 89, and the external tooth screw 91. As shown in FIG. The power source for moving the roof panel will be described in more detail with reference to FIG. 6 as follows. The fixed internal screw 85 that receives the power of the motor 79 has a female thread 93 formed on an inner circumferential surface of the terminal portion thereof, so that the male screw 95 is formed on the outer circumferential surface of the first inner and outer tooth screws 87 while being fitted therein. And the female screw 97 is formed on the inner peripheral surface of the end side of the first inner and outer tooth screw 87, and the male screw 99 is formed on the outer peripheral surface of the second inner and outer tooth screw 89 while being fitted therein. And the female screw 101 is formed on the inner circumferential surface of the end portion of the second inner and outer tooth screw 89, and the male screw 103 formed on the outer circumferential surface of the outer tooth screw 91 fitted therein is screwed with the male screw 103. Will be On the other hand, stoppers 105, 107, and 109 formed in a larger diameter than the respective main bodies are formed at the end of the root portion of the first and second internal and external tooth screws 87 and 89 and the external tooth screw 91, respectively. ) Is not separated from each other even if it rotates to the end. By the above structure, the three screws 87, 89, 91 are extended or contracted while interlocking with each other in the forward and reverse rotation of the motor 79.

In addition, the first and second inner and outer tooth screws 87 and 89 and the outer tooth screw 91 are rotatably supported by respective ends of the shaft support brackets 117, 119 and 121, and the shaft support brackets 117, 119 and 121 are respectively the first through the first to the second. The roof panels 71, 73 and 75 are fixed to the ends of the roof panels 71, 73 and 75 so that the roof panels 71, 73 and 75 are sequentially expanded or contracted in accordance with the movement of the screws and are received in the roof housing 77.

Meanwhile, rain dams 123 are formed on the upper surfaces of the first to third roof panels 71, 73, and 75 to guide the flow of rainwater. In addition, as shown in FIG. 7, a plurality of rollers 125 are attached to the bottoms of both sides of the first to third roof panels 71, 73, and 75, so that the rollers 125 have the side gates described above. The roller guider 127 formed on the upper end of the second movable panel 17 of (5, 5) is smoothly moved to the front and rear of the vehicle.

According to the above structure, the first to third roof panels 71, 73, and 75 are smoothly expanded and accommodated.

The cargo hold of the present invention configured as described above, when loading cargo into the loading box, first, the side gates 5 and 5 and the tail gate 7 are developed to form a space isolated from the outside on the vehicle body 3. The loop 9 is operated in order to cover the isolated space. In this case, the order of raising the side gates 5 and 5 and the tail gate 7 may be raised at the same time, the side gates 5 and 5 may be raised, and then the tail gate 7 may be raised, and the reverse order may be raised. have. And the order of opening the loading box according to the present invention is to first introduce the loop 9, then lower the tail gate (7) and finally lower the side gates (5, 5). The following description of the operation of the stacker will be described based on the individual operation process of each gate and loop regardless of the above operation sequence.

Hereinafter will be described in more detail the operation of the present invention.

First, as shown in FIG. 8A, when each clutch motor 25 is driven while the side gates 5 and 5, the tail gate 7, and the loop 9 are folded, the fixing panels 13 of both side gates 5 and 5 are driven. ), Two movable panels 15, 17 are deployed upward. The movable panels 15 and 17 to be deployed are lifted by the guiders 61 and 61 to form opposing walls on the vehicle body 3. Although not shown in the drawing, the tail gate 7 provided between the side gates 5 and 5 also has two movable tail panels 21 and 23 unfolded from the fixed tail panel 19, so that the upper portion of the vehicle body 3 is open. There is formed a predetermined space as shown in Fig. 8B.

Since the space formed as above is in an open state, as shown in FIG. 9A, the motor 79 installed in the roof housing 77 is driven to cover the open space. In more detail, as the motor 79 is driven, the first inner and outer tooth screws 87 extend in the roof housing 77, and the first roof panel 71 coupled thereto is developed together, and then the second inner As the outer tooth screw 89 is extended, the second roof panel 73 is expanded as shown in FIG. 9B, and the outer tooth screw 91 is subsequently extended, and the third roof panel (as shown in FIG. 9C) is expanded. 75) is developed. As the roof panel is sequentially moved as described above, the upper part of the space formed by the side gates 5 and 5 and the tail gate 7 is completely sealed by the first to third roof panels 71, 73, and 75. will be.

In the above description, as an embodiment for operating the loop 9, a screw-shaped screw and a motor for operating the same are provided. However, the present invention should not be construed as being limited thereto and may drive each roof panel sequentially. The loop operating system should be interpreted as being all inclusive. In the following, another embodiment of such a loop operating system is presented using FIGS. 10 to 12.

In the embodiment shown in Fig. 10, a winch 129 having drums 131 and 133 extended to both sides is used as a power source for driving the roof panel. In this embodiment, as a configuration for folding and unfolding the first to third roof panels 71, 73, and 75, a plurality of beams that are manufactured in different sizes and overlap each other, that is, the first to fourth beams 135, 137, 139, and 141 may be formed. Suggesting. On each of the first to fourth beams 135, 137, 139 and 141, rollers on which the drums 131 and 133 extend in the symmetrical direction as shown in FIG. 11 are fastened, and the ropes 143 and 145 are fixed to the respective rollers. The first to fourth beams 135, 137, 139, and 141 are sequentially deployed or reversely folded along the way.

As such, the technique of sequentially unfolding or folding the first to fourth beams 135, 137, 139, and 141 through a towing process by rotating the winch 129 to wind or unwind the ropes 143 and 145 is well known in the field of high ladders. The description of the method and the working relationship is omitted. However, in this embodiment, the second to fourth beams 137, 139 and 141 are coupled to the first to third roof panels 71, 73 and 75, respectively, to move the second to fourth beams 137, 139 and 141, respectively. The operation in which the first to third roof panels 71, 73, and 75 cover or open the upper portion of the vehicle body 3 is performed in the same manner as in the above-described embodiment.

As described above, the cargo box for the cargo vehicle of the present invention comprises a plurality of foldable members of the side gate, the tail gate and the loop, and is operated by the power means, thus providing a space to completely separate the upper side of the vehicle body from the outside while loading and unloading the cargo. In the city, work can be performed on either the left or the right side of the vehicle body or the rear side of the vehicle body.

Claims (14)

In cargo racks with cargo loading space on top of the body behind the cab, A plurality of movable panels 15 and 17 having the same cross-sectional shape and different sizes are housed in the interior of the fixed panel 13 connected to the hinges 11 and 11 to the vehicle body 3 so as to overlap each other, and the panel driving means. Side gates (5, 5) by which the plurality of movable panels (15, 17) are deployed or foldable from the fixed panel (13) to form opposing walls on both upper sides of the vehicle body (3); Wow A plurality of movable tail panels 21 and 23 having the same cross-sectional shape and different sizes are housed inside the fixed tail panel 19 connected to the hinge 11 to the vehicle body 3 so as to overlap each other, and the panel driving means. Tail gates (7) by which the plurality of movable tail panels (15, 17) are deployed or foldable from the fixed panel (13) to form a wall on the upper rear surface of the vehicle body (3); And A plurality of roof panels 71, 73 and 75 having the same cross-sectional shape and different sizes are housed in the roof housing 77 disposed above the cab 1 so that the plurality of roof panels 71, 73 and 75 overlap each other. A roof (9) in which roof panels (71,73,75) are deployed or foldable from the roof housing (77) to form a cover of the vehicle body (3); Cargo loading box, characterized in that it comprises a. The method of claim 1, wherein the panel driving means is a motor 25 fixed to the vehicle body (3), the movable panel (15, 17) and the tail gate (7) of the side gate (5, 5) by receiving the power of the motor A plurality of screws for driving each of the movable tail panels 15 and 17, an interlocking clutch 32 for intermittent transmission of power of the motor 25 to the screw, and an interlocking clutch 32 for the motor 25. Cargo vehicle loading compartment, characterized in that made of a power transmission means for connecting. The internal tooth of claim 2, wherein the screw has a cylindrical shape and is directly connected to the engagement clutch 32, and an internal thread 37 is formed on an inner circumferential surface of the end of the screw to engage a male screw 39 formed on an outer circumferential surface of the inner and outer tooth screws 33. Screw 31 and the inner tooth screw 31 is screwed into the inner end end of the inner peripheral surface is formed with a female screw 41 is engaged with the male screw 43 formed on the outer peripheral surface of the outer tooth screw 35 and the shaft support on the end end outer peripheral surface The bracket 53 is rotatably fixed and screwed into the inner and outer tooth screw 33 coupled to the movable panel or the movable tail panel by the fixed arm, and the inner and outer tooth screws 33, and the axial support bracket on the outer end surface of the end end. A load box for a freight vehicle, characterized in that (53) is rotatably fixed and consists of an external screw (35) coupled with a movable panel or a movable tail panel by a fixed arm. The stopper 45 or 47 having a diameter larger than the main body diameter of the inner and outer tooth screw 33 and the outer tooth screw 35 is formed at opposite ends of the inner and outer tooth screw 33 and the outer tooth screw 35. A loading box for cargo vehicles, characterized in that the. 4. The cargo box of claim 3, wherein the power transmission means is a bevel gear. 2. The guides 61 and 61 of a “⊂” shaped cross section for guiding the lifting motion of the movable panels 15 and 17 of the side gates 5 and 5 are vertical to both sides of the cab side of the vehicle body 3. Cargo loading box, characterized in that further formed in the direction. 2. The direction perpendicular to the longitudinal direction of the side gates 5 and 5, according to claim 1, wherein the corresponding surfaces of the side gates 5 and 5 guide the lifting movements of both end surfaces of the tail gate 7. Loading box for a cargo vehicle, characterized in that the protrusions (63, 63) extending further. The uppermost movable tail panel 23 of the tail gate 7 is provided with clasps 67 and 67, which are supported by elastic members 65 on both sides thereof and have an inclined bottom surface. The corresponding portion of (5,5) loading box for a cargo vehicle, characterized in that the engaging groove (69,69) is further formed to be inserted into the ends of the clasp (67,67). The method of claim 1, wherein the loop driving means is a motor (79) fixed to the roof housing 77, a plurality of screws and motors for driving each of the roof panels (71, 73, 75) by receiving the power of the motor ( 79) A load box for a cargo vehicle, characterized in that it is made of bevel gears (81,83) for transmitting the power of the screw. The method of claim 1, wherein the screw is cylindrical and is fixed in the roof housing 77, the inner end surface of the end end female thread 93 is formed to engage with the male screw 95 formed on the outer peripheral surface of the first inner and outer tooth screws 87 The inner tooth screw 85 is screwed into the inner tooth screw 85, and an internal thread 97 is formed on the inner end surface of the end end to be engaged with the male screw 99 formed on the outer circumferential surface of the second inner and outer tooth screw 89. A shaft support bracket 117 is rotatably fixed to the end outer circumferential surface, and is screwed into the first inner and outer tooth screws 87 and the first inner and outer tooth screws 87 coupled to the first roof panel 71. A female thread 101 is formed on the inner circumferential surface of the end and is engaged with the male screw 103 formed on the outer circumferential surface of the outer tooth screw 91. A shaft supporting bracket 119 is rotatably fixed to the outer circumferential surface of the end portion, and the second roof panel 73 is provided. Combined second inner and outer tooth screws 89, and 2 is screwed into the inner and outer tooth screw (89), the end end outer peripheral surface is characterized in that the shaft support bracket 121 is rotatably fixed and the outer tooth screw (91) coupled with the third loop panel (75) Cargo loading box. 11. The method of claim 10, wherein the first inner and outer tooth screw 87, the second inner and outer tooth screw 89 and opposite ends of the outer tooth screw 91 are formed at the first inner and outer tooth screw 87 and the second inner and outer tooth screw 89. And a stopper (105, 107, 109) having a diameter larger than the main body diameter of the outer tooth screw (91). The upper side surface of each roof panel (71, 73, 75) is a load rack for a freight vehicle, characterized in that the rain dam (123) for guiding the flow of rain water is further formed. According to claim 1, At least two or more rollers 125 attached to the bottom side of both sides of each roof panel (71, 73, 75), and corresponding to the position where each roller 125 is moved and the side gate (5) , 5) a roller guider 127 attached to the upper end of the movable panel 17 located on the uppermost side is formed for a cargo vehicle. The method of claim 1, wherein the loop drive means is a winch 129 is fixed to the roof housing 77, the drum (131, 133) coupled to both sides, the ropes (143, 145) wound on the drum (131, 133), the roof housing 77 ) The outermost part is fixed, the same cross-section, and the size is different, overlapping sequentially and the winding and unwinding of the plurality of beams (135, 137, 139, 141) and the rope (143, 145), one end is fixed to each roof panel (71, 73, 75), respectively According to each of the beams (135, 137, 139, 141) is towed to be sequentially deployed / folded and loads for cargo vehicles, characterized in that consisting of a plurality of rollers fixed to each of the beams (135, 137, 139, 141).