KR102446606B1 - Automatic Covering Device for Loading Box of Truck - Google Patents

Abstract

The present invention provides an automatic cover device for a truck loading box, which can be operated in a short time by using a link structure and can effectively completely cover the loading box.
The automatic cover device for a truck loading box of the present invention has a multi-section link structure having a plurality of links connected in a straight line, and a pair of link members installed at intervals corresponding to the width of the loading box, and a pair of link members Each link amount A plurality of support shafts installed across the ends, a drive motor fixedly installed on one side of the loading box, a driving force transmission device for transmitting the rotational force of the drive motor to the first support shaft, and a rotational force between the first support shaft and the second support shaft A rotation transmission device for transmitting, a cover cloth that is supported by a link member and a plurality of support shafts and covers the upper surface of the loading box, and a pair of shaft support brackets that are fixedly installed on one side of the loading box and rotatably support the first support shaft at intervals includes

Description

Automatic Covering Device for Loading Box of Truck}

The present invention relates to an automatic cover device for a truck loading box, and more particularly, to an automatic cover device for a truck loading box that can be operated in a short time and effectively completely cover the loading box.

In general, a loading box for loading various kinds of cargo is installed in a truck (lorry). Then, a cover is installed to cover the loading box in order to prevent the load loaded in the loading box from falling on the road when the truck is operated.

However, in the case of a dump truck, an automatic cover device is installed so that the driver can cover the cover of the loading box while sitting in the driver's seat.

For example, Korean Utility Model Publication Nos. 20-0207984, No. 20-0264863, No. 20-0340096, No. 20-0404042, No. 10-2020-0141176, No. 10-2020-0137675 No. 10-2011-0099565, Korean Patent Publication Nos. 10-0241299, 10-0439018, and the like, various technologies for automatic cover devices for truck loading boxes have been disclosed.

The conventional automatic cover device for a truck loading box is configured in a way to cover and open the loading box from both sides, and to cover and open the loading box in front and back.

In the conventional automatic cover device for truck loading boxes, in the case of the method of covering and opening from both sides, there is a risk of incompletely covered parts (gaps) occurring in the central part where both sides overlap, and since the driving device must be installed on both sides, energy There is a problem in that the consumption is large and the smooth covering operation is achieved only when the speeds of both driving devices are matched.

And, in the conventional automatic cover device for a truck loading box, in the case of the front and rear cover and open method, it takes a lot of time to cover and open because the length is long, and there is a problem that the cover (tent) flaps.

An object of the present invention is to provide an automatic cover device for a truck loading box, which is made from a bird's eye view of the above points, and is operated in a short time using a link structure and can effectively completely cover the loading box.

An automatic cover device for a truck loading box according to an embodiment of the present invention is made of a multi-section link structure having a plurality of links connected in a straight line, and a pair of link members installed at intervals corresponding to the width of the loading box, and a pair of the above A plurality of support shafts installed across opposite ends of each link of the link member, a drive motor fixed to one side of the loading box, and a rotational force of the drive motor are transmitted to the first support shaft among the plurality of support shafts a driving force transmitting device which is installed between the first supporting shaft and the second supporting shaft among the plurality of supporting shafts and transmitting the rotational force so that the second supporting shaft also rotates as the first supporting shaft rotates; A cover cloth supported by the support shaft of and covering the upper surface of the loading box, and a pair of shaft support brackets fixedly installed on one side of the loading box and rotatably supporting the first support shaft among the plurality of support shafts at intervals. .

The link member may be formed of a three-fold link structure of a first link, a second link, and a third link connected in a straight line.

The link member may be configured in various multi-section link structures such as a 2-section link structure, a 4-section link structure, and a 5-section link structure.

In the case where the link member is configured in a three-section link structure, the plurality of support shafts are the first support shafts installed across the first link in a state of being integrally fixed to the loading box side end portion of the first link of the pair of link members. A support shaft, a second support shaft that is a second support shaft installed across the opposite end of the first link of the pair of link members and the first link-side end of the second link, and a pair of the link members a third support shaft installed across the end of the second link opposite the first link of the second link and the end of the third link, and the second link opposite end of the third link of the pair of link members. It is made to include a fourth support shaft installed across.

The second support shaft is rotatably supported on an end portion of the first link, and is installed on an end portion of the second link so as to be integrally supported.

The third support shaft is rotatably supported on an end portion of the second link, and is installed on the end portion of the third link to be integrally supported and fixed.

The four support shafts may be installed in a state where they are integrally fixed to the end portion of the third link.

At both ends of the third support shaft, a landing gear having grooves formed at regular intervals on the circumference is installed, and a plurality of landing gears having grooves formed thereon are installed on the side of the loading box at regular intervals in the longitudinal direction of the loading box so that the grooves of the landing gear are sequentially engaged. It is also possible to install a landing protrusion.

It is also possible to install an elastic member between the second link and the third link to apply a force so that the third link is folded toward the second link.

As the driving force transmitting device, it is possible to use various power transmitting devices such as a belt and a pulley, a chain and a sprocket, a gear, etc. installed between the shaft of the driving motor and the first supporting shaft.

The rotation transmission device includes a drive sprocket installed on the first support shaft, a driven sprocket installed on the second support shaft and having a gear ratio different from that of the drive sprocket, and a chain installed on the drive sprocket and the driven sprocket It is also possible to do

It is also possible to install a chain support protrusion on the first link to prevent sagging by supporting the chain of the rotation transmission device in the middle.

It is also possible to install a tension adjusting member so as to adjust the tension by adjusting the length of the chain of the rotation transmission device.

It is also possible to install a cargo protector on the bottom surface of the first link and the second link to prevent the cargo from being damaged by direct contact with the cargo accommodated in the loading box.

A pair of operation auxiliary members are installed at intervals between the first link and the second link so that the folding and unfolding operation can be stably performed.

The pair of operation auxiliary members are installed across the second support shaft and the third support shaft, one end of which is rotatably coupled to the third support shaft, and the other end is installed to protrude from the second support shaft. A rod and a second rod having one end rotatably coupled to the first support shaft and rotatably connected to the first rod at the other end thereof.

The first rod is integrally connected to the second support shaft.

The second rod is configured to be adjustable in length.

It is also possible to install a shock absorber on the second bar to prevent abrupt folding of the link member.

According to the automatic cover device for a truck loading box according to an embodiment of the present invention, since the folding operation is made by the link member made of a multi-section link structure, the operation time to cover and open the loading box is made in a short time, and the space required for operation is small. There are advantages.

And, according to the automatic cover device for the truck loading box according to the embodiment of the present invention, since the operation auxiliary member installed with the shock absorber is used, it is possible to minimize sloshing during the folding operation, and it is applied to the drive motor and the link member instantaneously. It is possible to reduce the losing impact.

In addition, according to the automatic cover device for a truck loading box according to an embodiment of the present invention, since the landing gear and the landing protrusion are installed, the end of the cover fabric supported by the last link of the link member wraps around the rear end of the loading box. It is possible to effectively prevent the load from falling to the rear of the load box.

According to the automatic cover device for truck loading according to the embodiment of the present invention, since the cargo protector is installed, it is possible to prevent the link member from directly contacting the cargo and causing damage as well as the cargo falling as the loading box shakes from side to side. It is also possible to prevent damage to the link member by cargo.

And, according to the automatic cover device for truck loading according to the embodiment of the present invention, it is possible to adjust the length of the second bar of the operation auxiliary member, it is possible to adjust the length of the chain of the rotation transmission device, so that the tension from time to time It is possible to maintain constant folding operation by adjusting the

In addition, according to the automatic cover device for a truck loading box according to an embodiment of the present invention, the cover cloth is stably supported by a link member and a plurality of support shafts to prevent flapping, and the cover cloth covers the upper surface of the loading box from the front to the rear. Therefore, incompletely covered parts (gaps) do not occur.

1 is a perspective view showing an automatic cover device for a truck loading box according to an embodiment of the present invention.
2 is a side view showing a folded state of the link member in the automatic cover device for a truck loading box according to an embodiment of the present invention.
3 is a side view conceptually illustrating a folding operation of a link member in the automatic cover device for a truck loading box according to an embodiment of the present invention.
4 is a partial cross-sectional side view showing the configuration of a second bar in the automatic cover device for a truck loading box according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

The terms used herein are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, process, operation, component, part, or combination thereof described in the specification is present, but one or more other features It is to be understood that this does not preclude the existence or addition of numbers, processes, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with the meanings in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

The term "MODULE" as used herein means a unit that processes a specific function or operation, which may mean hardware or software or a combination of hardware and software.

The terms or words used in the present specification and claims should not be construed as being limited to their ordinary or dictionary meanings, and the inventor may properly define the concept of the term in order to best describe his invention. Based on the principle that there is, it should be interpreted as meaning and concept consistent with the technical idea of the present invention. In addition, unless there are other definitions in the technical and scientific terms used, it has the meaning commonly understood by those of ordinary skill in the art to which this invention belongs, and in the following description and accompanying drawings, the gist of the present invention Descriptions of known functions and configurations that may be unnecessarily obscure will be omitted. The drawings introduced below are provided as examples in order to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the present invention is not limited to the drawings presented below and may be embodied in other forms. Also, like reference numerals refer to like elements throughout. It should be noted that the same components in the drawings are denoted by the same reference numerals wherever possible.

Next, a preferred embodiment of the automatic cover device for a truck loading box according to the present invention will be described in detail with reference to the drawings.

The present invention can be implemented in various various forms, and is not limited to the embodiments described below.

Hereinafter, in order to clearly explain the present invention, detailed descriptions of parts not closely related to the present invention are omitted, and the same reference signs are attached to the same or similar components throughout the description of the invention, and repeated descriptions are omitted. .

First, the automatic cover device for a truck loading box according to an embodiment of the present invention, as shown in FIGS. 1 to 3 , a pair of link members 10 , a first support shaft 22 , and a second support shaft (24), the third support shaft 26, the fourth support shaft 28, the drive motor 30, the driving force transmission device 34, the rotation transmission device 40, and the cover cloth 50 ), and a shaft support bracket (60).

The pair of link members 10 has a three-section link structure in which the first link 11, the second link 12, and the third link 13 are connected in a straight line.

Although the link member 10 has been described as a three-bar link structure in the above, it is also possible to configure it in various multi-bar link structures such as a four-bar link structure or a five-bar link structure, and it is also possible to configure it as a two-bar link structure.

The pair of link members 10 are installed at intervals corresponding to the width of the loading box (2).

The pair of link members 10 are installed to be folded or unfolded in the front and rear direction (longitudinal direction) of the loading box (2).

Among the pair of link members 10, the first support shaft 22 is installed across the end portion of the loading box 2 side of the first link 11.

The first support shaft 22 is installed at the end of the first link 11 in a state where it is integrally fixed by welding or the like.

The second support installed across a pair of link members 10 is an end portion of the first link 11 opposite to the loading box 2 and an end portion of the second link 14 on the first link 11 side. The shaft 24 is connected to enable relative rotation.

The second support shaft 24 is rotatably supported on the end portion of the first link 11 , and is installed on the end portion of the second link 12 so as to be integrally fixedly supported.

For example, the end portions of the second support shaft 24 and the second link 12 are integrally fixed by a method such as welding.

The end of the second link (12) opposite the first link (11) and the end of the third link (13) on the second link (12) side are installed across the pair of link members (10). 3 is connected to enable relative rotation through the support shaft (26).

The third support shaft 26 is rotatably supported at the end of the second link 12 , and is installed at the end of the third link 13 so as to be integrally fixed and supported.

For example, the end portions of the third support shaft 26 and the third link 13 are integrally fixed by a method such as welding.

An end portion of the third link 13 opposite to the second link 12 is connected and supported through a fourth support shaft 28 installed across the pair of link members 10 .

The four support shafts 28 may be installed in a state where they are integrally fixed to the end of the third link 13 by welding or the like.

The first support shaft 22 is rotatably supported through a pair of shaft support brackets 60 that are fixedly installed at intervals on one side of the loading box 2 .

The driving motor 30 is fixedly installed on one side of the loading box (2).

The rotational force of the driving motor 30 is transmitted to the first support shaft 22 through the driving force transmitting device 34 .

The driving force transmitting device 34 can use various power transmitting devices, such as a belt and a pulley, a chain and a sprocket, a gear, etc. installed between the shaft of the driving motor 30 and the first supporting shaft 22 . Detailed description will be omitted.

The rotation transmission device 40 is installed between the first support shaft 22 and the second support shaft 24 .

For example, the rotation transmission device 40 transmits a rotational force so that the second support shaft 24 also rotates as the first support shaft 22 rotates.

The rotation transmission device 40 includes a driving sprocket 42 installed on the first supporting shaft 22 and a driven driven sprocket 42 installed on the second supporting shaft 24 and having a gear ratio different from that of the driving sprocket 42 . It is also possible to include a chain 46 installed on the sprocket 44 and the driving sprocket 42 and the driven sprocket 44 .

If the gear ratio of the driving sprocket 42 and the driven sprocket 44 is configured differently in the above, a difference occurs in the rotational speed of each other connected by the chain 46, and the effect of rotating in relatively opposite directions is obtained.

For example, if the diameter of the driven sprocket 44 is larger than that of the drive sprocket 42 and the gear ratio is configured differently, the rotation speed of the driven sprocket 44 is higher than the rotation speed of the drive sprocket 42 . will be delayed

Accordingly, when the first support shaft 22 rotates in the clockwise direction, the rotation speed of the second support shaft 24 is slowed, and the second link 12 is angled with respect to the first link 11 . rotates in the unfolding direction.

Conversely, even when the first support shaft 22 rotates counterclockwise, the rotation speed of the second support shaft 24 is slowed, and the second link 12 has a narrow angle with respect to the first link 11 . It rotates in the folding direction.

In the above, the larger the gear ratio of the driving sprocket 42 and the driven sprocket 44, the faster the rotation speed of the second link 12, and the smaller the gear ratio, the slower the rotation speed of the second link 12.

It is also possible to install a chain support protrusion 47 on the first link 11 to support the chain 46 of the rotation transmission device 40 in the middle to prevent it from sagging.

It is also possible to install a tension adjusting member 48 on the chain 46 of the rotation transmission device 40 to adjust the tension by adjusting the length.

For example, the tension adjusting member 48 may be configured using a turnbuckle or the like.

The tension adjusting member 48 is installed in a state of being inserted into the middle of the chain 46 .

The cover cloth 50 is supported by the link member 10 and the first support shaft 22 , the second support shaft 24 , the third support shaft 26 , and the fourth support shaft 28 .

As shown in FIG. 1 , the cover cloth 50 is a first link 11 , a second link 12 , and a third link 13 of the link member 10 using a cover fixing member 52 . and the first support shaft 22 , the second support shaft 24 , the third support shaft 26 , and the fourth support shaft 28 are installed.

As the cover fixing member 52, it is possible to use a string, a wire, a ring, or the like.

And, as shown in FIGS. 1 and 3 , a landing gear 66 in which a groove 67 is formed at regular intervals around the circumference is installed at both ends of the third support shaft 26 , and a loading box 2 ), it is also possible to install a plurality of landing protrusions 68 at regular intervals in the longitudinal direction of the loading box 2 so that the grooves 67 of the landing gear 66 are sequentially engaged.

When the landing gear 66 and the landing protrusion 68 are installed as described above, the landing gear 66 rotates in a state in contact with the landing protrusion 68 as the link member 10 unfolds. , while the third support shaft 26 on which the landing gear 66 is installed rotates, the third link 13 rotates toward the loading box 2 , and the link member 10 is fully unfolded and at the same time the third link member 10 is fully unfolded. The link 13 and the fourth support shaft 28 are folded to the rear edge of the loading box 2 , and the rear end of the cover cloth 50 completely covers the rear edge of the loading box 2 .

Loading the entire length connected to the first link 11 and the second link 12 in a state in which the first link 11 and the second link 12 of the link member 10 are spread close to a straight line (2) ), the third link 13 is wrapped around the rear upper edge of the loading box 2 by the operation of the landing gear 66 and the landing protrusion 68 .

In addition, it is also possible to install an elastic member 64 between the second link 12 and the third link 13 that applies a force so that the third link 13 is folded toward the second link 12 .

The elastic member 64 is composed of a torsion spring, etc., and when the landing gear 66 is out of engagement with the landing protrusion 68, the third link 13 rotates to the opposite side of the loading box 2 by the elastic force. It is installed to apply a force to be folded toward the second link (12).

1 and 2, the first link 11 and the second link 12 have a cargo protector 58 on the bottom surface to prevent the cargo from being damaged by direct contact with the cargo accommodated in the loading box (2). ) can also be installed.

By installing the cargo guard 58 as described above, it is also possible to effectively prevent the cargo from falling as the loading box shakes from side to side.

And, as shown in FIG. 1, a pair of operation auxiliary members 70 are installed at intervals between the first link 11 and the second link 12 so that the folding operation of folding and unfolding can be stably performed. .

The pair of operation auxiliary members 70 are installed to cross the second support shaft 24 and the third support shaft 26, one end of which is rotatably coupled to the third support shaft 26 and the opposite end. A portion of the first rod 72 is installed to protrude from the second support shaft 24, one end is rotatably coupled to the first support shaft 22, and the other end is the first rod 72 and a second rod 74 that is rotatably connected to.

The first rod 72 is integrally fixedly connected to the second support shaft 24 by welding or the like.

The second rod 74 is configured to be adjustable in length.

For example, it is also possible to install a length adjustment member 75 composed of a turnbuckle or the like on the second bar 74 .

And, as shown in FIG. 4 , it is also possible to install a shock absorber 76 on the second bar 74 to prevent abrupt folding of the link member 10 .

As the shock absorber 76, it is also possible to use a shock absorber used in a vehicle or the like.

Next, an operation process of the automatic cover device for a truck loading box according to an embodiment of the present invention configured as described above will be described with reference to FIGS. 1 and 3 .

First, when the drive motor 30 is operated to cover the top surface of the loading box 2 in a state in which the link member 10 is fully folded (the top surface of the loading box 2 is open), as shown in FIG. 2 , the drive motor 30 ) is transmitted to the first support shaft 22 through the driving force transmission device 34 , and the first support shaft 22 rotates clockwise as seen in FIG. 3 .

When the first support shaft 22 is rotated, the first link 11 of the link member 10 is rotated toward the loading box 2 , and the first support shaft 22 and the rotation transmission device 40 are rotated. While the second support shaft 24 connected to the And, the operation of covering the upper surface of the cover cloth 50 is the loading box (2) is made.

And, as the link member 10 is unfolded, the third support shaft 26 approaches the upper edge of the loading box 2, and the groove of the landing gear 66 installed on the third support shaft 26 ( 67), one of the landing protrusions 68 installed on the side of the loading box 2 is engaged, and as the link member 10 is further expanded, the landing gear 66 is sequentially engaged with the landing protrusion 68 and the third support The shaft 26 is rotated, and the third link 13 is rotated toward the loading box (2).

By the operation of the landing gear 66 as described above, the third link 13 and the fourth support shaft 28 are covered and wrapped around the rear side of the loading box 2, and the rear edge of the loading box 2 is completely It is covered with a cover cloth (50).

When the driving motor 22 is rotated in reverse to make the upper surface of the loading box 2 open in the above state, the first link 11 is loaded as the first support shaft 22 rotates (2). ) rotates in a direction away from, and the second support shaft 24 rotates at a relatively slow speed while the second link 12 rotates in a direction in which it is folded toward the first link 11 .

And, as the link member 10 is folded and the force applied to engage the landing gear 66 with the landing protrusion 68 is removed, according to the elastic force of the elastic member 64, the third link 13 becomes the second link ( 12) and rotates in the direction (away from the loading box (2)).

As described above, as the drive motor 30 is operated in forward rotation or reverse rotation, a folding operation in which the link member 10 having a three-section link structure is unfolded or folded is performed, and the longitudinal direction (front and rear) of the loading box 2 is performed. direction) to cover or open the upper surface.

In the above, a preferred embodiment of the automatic cover device for a truck loading box according to the present invention has been described, but the present invention is not limited thereto, and various modifications can be made within the scope of the claims, the description of the invention, and the accompanying drawings. and also fall within the scope of the present invention.

2 - loading box, 10 - link member, 11 - 1st link, 12 - 2nd link, 13 - 3rd link
22 - first support shaft, 24 - second support shaft, 26 - third support shaft, 28 - fourth support shaft
30 - drive motor, 34 - drive force transmission device, 40 - rotation transmission device
42 - drive sprocket, 44 - driven sprocket, 46 - chain, 47 - change support protrusion
48 - tension adjusting member, 50 - cover cloth, 52 - cover fixing member, 58 - cargo guard
60 - shaft support bracket, 64 - elastic member, 66 - landing gear, 67 - groove, 68 - landing protrusion
70 - operation auxiliary member, 72 - first rod, 74 - second rod, 75 - length adjustment member
76 - shock absorber

Claims (10)

delete A pair of link members made of a multi-section link structure having a plurality of links connected in a straight line and installed at an interval corresponding to the width of the loading box, and the pair of link members across opposite ends of each link corresponding to each other A plurality of supporting shafts installed, a driving motor fixedly installed on one side of the loading box, a driving force transmitting device for transmitting the rotational force of the driving motor to a first supporting shaft among the plurality of supporting shafts, and a first supporting shaft among the plurality of supporting shafts A rotation transmission device installed between the shaft and the second support shaft and transmitting a rotational force so that the second support shaft also rotates as the first support shaft rotates, and a cover cloth supported by the link member and a plurality of support shafts and covering the upper surface of the loading box and a pair of shaft support brackets fixedly installed on one side of the loading box and rotatably supporting the first support shaft among the plurality of support shafts at intervals,
The link member consists of a three-section link structure of a first link, a second link, and a third link connected in a straight line,
The plurality of support shafts include a first support shaft that is a first support shaft installed across the stack while being integrally fixed to the end of the first link of the pair of link members, and the first link of the pair of link members. A second support shaft, which is a second support shaft installed across the opposite end portion of the loading box and the first link end portion of the second link, and the first link opposite end portion and the third of the second link of the pair of link members Automatic for a truck loading box, comprising: a third support shaft installed across the second link end of the link; and a fourth support shaft installed across the second link opposite end of the pair of third links of the link member. cover device. 3. The method according to claim 2,
The second support shaft is rotatably supported on the end portion of the first link, and is installed on the end portion of the second link to be supported in a state of being integrally fixed,
The third support shaft is rotatably supported on the end portion of the second link, and the automatic cover device for the truck loading box is installed to be supported in a state where it is integrally fixed to the end portion of the third link. 3. The method according to claim 2,
At both ends of the third support shaft, a landing gear having grooves formed at regular intervals on the circumference is installed, and a plurality of landing gears having grooves formed thereon are installed on the side of the loading box at regular intervals in the longitudinal direction of the loading box so that the grooves of the landing gear are sequentially engaged. Automatic cover device for truck loading box to install landing protrusion. 3. The method according to claim 2,
An automatic cover device for a truck loading box for installing an elastic member between the second link and the third link to apply a force so that the third link is folded toward the second link in a direction away from the loading box. 3. The method according to claim 2,
The driving force transmission device uses a power transmission device selected from a belt and a pulley, a chain and a sprocket, and a gear installed between the shaft of the driving motor and the first support shaft,
The rotation transmission device includes a drive sprocket installed on the first support shaft, a driven sprocket installed on the second support shaft and having a gear ratio different from that of the drive sprocket, and a chain installed on the drive sprocket and the driven sprocket Automatic cover device for truck loading boxes. 7. The method of claim 6,
A chain support protrusion is installed on the first link to support the chain of the rotation transmission device in the middle to prevent it from sagging,
An automatic cover device for a truck loading box for installing a tension adjusting member so that the tension can be adjusted by adjusting the length of the chain of the rotation transmission device. 3. The method according to claim 2,
An automatic cover device for a truck loading box for installing a cargo protector on the bottom surface of the first link and the second link. 3. The method according to claim 2,
A pair of operation auxiliary members are installed at intervals between the first link and the second link so that the folding operation of folding and unfolding is stably made,
The pair of operation auxiliary members are installed across the second support shaft and the third support shaft, one end of which is rotatably coupled to the third support shaft, and the other end is installed to protrude from the second support shaft. a rod, and a second rod having one end rotatably coupled to the first support shaft and the other end rotatably connected to the first rod,
The first rod is an automatic cover device for a truck loading box that is integrally and fixedly connected to the second support shaft. 10. The method of claim 9,
The second bar is configured to be able to adjust the length,
An automatic cover device for a truck loading box to install a shock absorber on the second bar.

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