KR20230172117A - Rear gate device for cargo vehicle with cushioning function - Google Patents

Abstract

The present invention relates to a rear gate device for a cargo vehicle with a buffering function, which can cushion the load and impact transmitted during the rotation of a rear gate with a foldable structure or when loading and unloading an object through the rear gate. It's about.

Description

Rear gate device for cargo vehicle with cushioning function}

The present invention relates to a rear gate device for a cargo vehicle with a buffering function, which can cushion the load and impact transmitted during the rotation of a rear gate with a foldable structure or when loading and unloading an object through the rear gate. It's about.

To address the aging of the agricultural population and improve agricultural productivity, various types of agricultural machinery are widely used to grow and harvest crops.

These agricultural machines are equipped with a variety of work equipment to perform tasks appropriate for their intended use. Not only are they heavy, but their operating speed is relatively slow, making long-distance driving on the road inconvenient, so most of them are transported by loading them into the cargo vehicle. It's common.

Therefore, in order to load agricultural machinery into a truck bed and transport it to a work site, a ladder is needed to load and unload agricultural machinery into the truck bed.

In the past, such a ladder for getting on and off agricultural machinery was manufactured separately and carried in the loading box of a vehicle. When getting on and off the agricultural machinery, one end of the ladder was fixed to the rear end of the loading box, and the other end of the ladder was installed at an angle so as to touch the ground, and then the agricultural machinery in the loading box was unloaded. Alternatively, agricultural machinery on the ground could be mounted on a vehicle.

However, in the case of ladders that are manufactured separately and carried on vehicles, they are made of metal materials with sufficient rigidity and durability to enable safe movement when getting on and off agricultural machinery, so the driver needs a lot of physical labor to install or dismantle the heavy ladder. Various safety accidents frequently occurred when loading or installing ladders.

Therefore, in order to overcome the problems of the conventional agricultural machinery transport vehicle, a ladder is installed integrally at the rear of the truck's loading box, and a hydraulic cylinder is used to unfold the ladder or lift the unfolded ladder to the loading container side to enable boarding and unloading of agricultural machinery. Dedicated vehicles for transportation appeared.

On the other hand, vehicles dedicated to transporting agricultural machinery use the loading boxes of general cargo trucks as is or partially modified. Since the loading boxes of general cargo trucks have a high ground clearance, the ladder installed at the rear of the loading box is also long, and the length of the agricultural machinery is also high. The length cannot be shortened to maintain an inclination angle that allows safe movement when boarding and disembarking.

Therefore, a long ladder is made into a folding structure so that the folded ladder is unfolded when installing the ladder, and after boarding and disembarking agricultural machinery, the unfolded ladder is folded and moved vertically to the rear of the loading box.

When installing a ladder with a foldable structure on such a vehicle for transporting agricultural machinery, a structure in which one or more hydraulic cylinders are installed as disclosed in Korean Patent Publication No. 10-1222185 is used for the folding operation of the ladder.

Since the rear gate device configured in this way is a heavy object, a lot of load and impact is applied to the bracket that holds the cylinder during the folding operation.

In particular, the axis of the end of the lower cylinder, which is rotatably connected to the car body and controls the rotation of one side of the rear gate, and the fixing bracket, which is mounted on the car body axis and rotatably penetrates the axis, are used to control the folding and unfolding of the rear gate. During construction, a lot of load and impact are applied repeatedly, making it vulnerable to durability.

Therefore, when the rear gate is used for a certain period of time, the lower cylinder or the brackets connected to the lower cylinder, which are subject to particularly large loads and impacts, are damaged, causing the inconvenience of having to replace the bracket or lower cylinder at regular intervals. As a result, work disruption often occurs. In addition, there was a problem that when the bracket or lower cylinder was damaged, the rear gate could not be smoothly unfolded or folded, which could cause a safety accident.

In addition, the rear gate device is rotatably mounted on the lower side of the car body where the lower cylinder faces the ground vertically, so it is not easy to replace when the fixing bracket or lower cylinder is damaged, and the installation locations are very limited. There is.

Republic of Korea Patent Publication No. 10-1222185: Rear gate device for cargo truck loading box.

The present invention is intended to solve the above problems, and the cylinder for rotating the rear gate is connected to the rear end of the vehicle frame, making it easy to install and maintain, and allowing the vehicle to be moved during the rear gate folding operation or through the rear gate. The aim is to provide a rear gate device that can alleviate the load and shock transmitted when loading and unloading objects to be transported on the cargo side.

The rear gate device for a cargo vehicle with a shock absorbing function of the present invention to solve the above problems includes a fixing bracket mounted on the rear end of the frame of the vehicle, and a rear end of the frame that can be rotated up and down at a position above the fixing bracket. A rear gate including an upper ladder that is mounted at the top and opens and closes the rear of the loading space of the vehicle, and is mounted on one side of the upper ladder facing rearward when the upper ladder is positioned upright with respect to the frame and includes a rear gate of the fixing bracket. A buffer support bracket positioned vertically upward, one side of which is rotatably mounted on the fixing bracket and the other side of which is rotatably mounted on the buffer support bracket, which rotates the upper ladder to open and close the rear of the loading box according to length expansion. It is provided with an upper rotating cylinder, and the buffer support bracket extends in a direction parallel to the longitudinal direction of the upper ladder so that a buffer support shaft connected to the other side of the upper rotating cylinder in a direction perpendicular to the longitudinal direction of the upper rotating cylinder is movably penetrated. It is characterized in that a buffer guide hole in the form of a long hole is formed.

The upper ladder has one side of the ladder main body axially coupled to pivoting support pieces protruding above the rear end of the frame so as to be rotatable up and down, and includes a plurality of length extension bars extending in parallel with each other, and a plurality of length extension bars. Connecting and each including a plurality of mutually spaced footrest bars spaced apart from each other at regular intervals in the longitudinal direction of the length extension bar, and a plurality of sadiri body parts spaced apart from each other in parallel in the width direction of the frame; and, the buffer support The bracket is formed in a plate shape extending parallel to the fixing bracket, supports a plurality of step bars when rotated so that one side of the upper ladder faces the ground, and is formed around the bracket main portion where the buffer guide hole is formed and the buffer guide hole. Accordingly, it is provided with a reinforcing rib that protrudes from the bracket main body, and the bracket main body extends in length to support the footrest bar and enters between the footrest pants support portion on which the buffer guide hole is formed and the footrest bars spaced apart from each other in the footrest bar support portion. It is desirable to have a plurality of reinforcing protrusions extending sufficiently.

The upper rotating cylinder includes a shock absorbing portion on one side connected to the fixing bracket that cushions the impact of the load or rotation of the transport target equipment applied to the rear gate in the longitudinal direction; It may be provided with a length extension portion including a forward and backward rod, one side of which is rotatably connected to the buffer support bracket, and a cylinder body portion where the other side of the forward and backward rod is accommodated on one side and the shock absorber is connected to the other side. there is.

The shock absorbing unit includes a shock buffering cylinder extending parallel to the cylinder body from the other end of the cylinder body, a shock absorbing rod on one side of which is advanced and retractable in the shock absorbing cylinder, and a shock absorbing rod accommodated in the shock absorbing cylinder to impact the shock. It is provided with an elastic member that elastically supports the shock absorbing rod, and the shock absorbing rod has a long advancing and retreating guide hole formed in the width direction and extending in the longitudinal direction on one side accommodated in the shock absorbing cylinder. It is preferable to include a separation prevention bolt that penetrates the shock absorbing cylinder so as to penetrate the advance/retract guide hole, limits the moving distance of the shock buffer rod, and prevents the shock buffer rod from being separated from the shock buffer cylinder.

The rear gate device for a cargo vehicle with a shock absorbing function of the present invention has the advantage of being easy to install and maintain because the upper rotating cylinder for rotating the rear gate is connected to the rear end of the vehicle frame.

In addition, in the rear gate device for a cargo vehicle with a buffer function of the present invention, the buffer guide hole of the buffer support bracket through which the buffer support shaft connected to the upper rotating cylinder extends in the form of a long hole in the longitudinal direction of the upper ladder, so that the buffer support shaft acts as a buffer guide. As the ball moves in the longitudinal direction, the load and impact acting on the upper rotating cylinder can be alleviated, so durability can be improved, and furthermore, cargo unloading efficiency can be improved.

In addition, the rear gate device for a cargo vehicle with a shock absorbing function of the present invention can double cushion the impact of the load of the transported equipment transmitted to the length extension portion by the shock absorbing portion, thereby improving durability and further improving cargo unloading efficiency. It can be.

In addition, in the rear gate device for a cargo vehicle with a shock absorbing function of the present invention, when the advancing/retracting rod of the lengthening portion is lowered relative to the cylinder body portion by its own weight while the rear gate is rotated to be upright, the shock absorbing portion that was shortened in length restores its length. As the lengthening portion rises upward, the rear gate can be prevented from tilting backward.

1 is a side view of a freight vehicle equipped with a rear gate device for freight vehicles with a shock absorbing function according to an embodiment of the present invention;
Figure 2 is a side view showing the rotational state of the rear gate device for the freight vehicle of Figure 1;
Figure 3 is a rear view showing the rear gate device for the freight vehicle of Figure 1 in an upright state with respect to the frame;
Figure 4 is a partial perspective view of the rear gate device for the freight vehicle of Figure 1;
Figure 5 is a cross-sectional view of the upper rotating cylinder of the rear gate device for a cargo vehicle with a buffer function of Figure 1;
Figure 6 is a side view of a rear gate device for a cargo vehicle with a shock absorbing function according to another embodiment of the present invention.

Hereinafter, the rear gate device for a cargo vehicle with a shock absorbing function according to the present invention will be described in detail with reference to the attached drawings.

1 to 5 show a rear gate device 10 for a cargo vehicle with a shock absorbing function according to an embodiment of the present invention.

A rear gate device 10 for a cargo vehicle with a shock absorbing function according to an embodiment of the present invention includes a plurality of pairs of first fixing brackets 11; rear gate 31; Multiple pairs of buffer support brackets (71); A plurality of upper rotating cylinders (91); A pair of second fixing brackets (111) and a lower rotating cylinder (131); It is provided with a rotating body (151).

A plurality of pairs of first fixing brackets 11 are mounted on the rear end of the frame 5 to protrude rearward. A pair of first fixing brackets 11 are spaced apart from another pair of first fixing brackets 11 in the width direction of the frame 5.

The first fixing bracket 11 has a thickness in the width direction of the frame 5 and is formed in a plate shape extending in the vertical direction. The length protruding from the frame 5 increases as it goes downward.

The rear gate 31 is an upper ladder 32 that is mounted on the upper rear end so that one side can be rotated up and down at a position above the first fixing bracket 11, and opens and closes the rear of the loading space 6 of the vehicle 1. and a lower ladder 52, one side of which is rotatably connected to the other side of the upper ladder 32, and which can be rotated to extend in a straight line or overlap with the upper ladder 32.

The upper ladder 32 is mounted on one side to be rotatable up and down by being axially coupled to the first pivoting support piece 7 protruding above the rear end of the frame 5.

The upper ladder 32 extends parallel to each other and includes a pair of first ladder main bodies 33 spaced apart from each other in the width direction of the frame 50, and a first connection bar connecting the first ladder main bodies 33 ( 38) is provided.

The first ladder main body 33 is mounted on one side to be rotatable up and down by being axially coupled to the first rotational support pieces 7 protruding above the rear end of the frame 5, and includes a pair of ladders extending parallel to each other. A plurality of first footrest bars (35) that connect one length extension bar (34) and a pair of first length extension bars (34) and are spaced apart from each other at regular intervals in the longitudinal direction of the first length extension bar (34). ) is provided.

In addition, the upper ladder 32 is formed to protrude from one of the first connection bars 38a that interconnect one side of the pair of first ladder main bodies 33 among the plurality of first connection bars 38. A pair of second fixing brackets (111) are provided.

The lower ladder 52 has one end coupled to the other end of the upper ladder 32 with a shaft 60 and is rotatable up and down.

The lower ladder 52 extends parallel to each other and includes a second ladder main body 53 spaced apart from each other in the width direction of the frame 5, and a plurality of second connections connecting the second ladder main bodies 53. It is provided with a bar (58).

One side of the second ladder main body 53 is connected to a plurality of pivoting pieces 48, each of which is axially coupled to the second pivoting support pieces 38 protruding from the rear end of the first length extension bar 34. The rotating piece (48) is a pair of pieces that are each rotated together and unfolded against the first length extension bar (34) or folded on the first length extension bar (34) so as to be positioned in a straight line with the first length extension bar (34). A plurality of second footrest bars (55) that connect the second length extension bar (54) and a pair of second length extension bars (54) and are spaced apart from each other at regular intervals in the longitudinal direction of the second length extension bar (54). ) is provided.

The plurality of pairs of buffer support brackets 71 are provided to correspond to the number of the plurality of pairs of first fixing brackets 11.

The buffer support bracket 71 faces rearward when the upper ladder 31 of the rear gate 30 is positioned upright with respect to the frame 5, or faces downward when the upper ladder 31 rotates downward toward the ground. is mounted on

Each pair of buffer support brackets 71 is fixed to the first step bars 35 between the pair of first ladder main bodies 33 so that the upper ladder 31 is positioned upright with respect to the frame 5. When the upper ladder (31) is rotated downward toward the ground, it is located vertically above the first fixing bracket (11), or it is located at the rear of the extension line of the first fixing bracket (11).

The buffer support bracket 71 is formed in a plate shape extending parallel to the first fixing bracket 11, supports a plurality of first step bars 55 when rotated so that one side of the upper ladder 32 faces the ground, and supports the upper ladder 32. The bracket body portion 72 is formed with a long cushioning guide hole 74 extending in a direction parallel to the longitudinal direction of the ladder 32, and the bracket body portion 72 is formed along the circumference of the buffering guide hole 74. It is provided with a protruding reinforcing rib (76).

The bracket body portion 72 extends in length to support a plurality of first footrest bars 55, and includes a footrest bar support portion 73 formed with a buffer guide hole 74, and a first footrest bar support portion 73 spaced apart from each other in the footrest bar support portion 73. It is provided with a reinforcing protrusion (75) extending between the footrest bars (55).

One side of the upper rotating cylinder (91) is rotatably mounted on the first fixing bracket (11) and the other side is rotatably mounted on the buffer support bracket (71) so that the rear of the loading space (6) can be opened and closed according to the length expansion. Rotate the upper ladder (32).

The upper rotating cylinder (91) is connected to the first fixing bracket (11) protruding from the frame (5) and responds to the load or rotation of the transport equipment applied to the upper ladder (32) and lower ladder (52) in the longitudinal direction. A shock absorbing unit 92 that cushions the impact against the body; A first advance rod 108, one side of which is rotatably connected to the buffer support bracket 71, and the other side of the first advance rod 108, which is capable of advancing and retreating, is accommodated on one side and a shock absorber 92 is connected to the other side. and a length extension portion 106 including a first cylinder body portion 107.

The shock absorbing portion 92 includes a shock absorbing cylinder 93 extending from the other end of the first cylinder body portion 97 in a direction parallel to the first cylinder body portion 97 and away from the first cylinder body portion 97. , a shock absorbing rod 94, one side of which is capable of advancing and retreating in the shock absorbing cylinder 93, and a long advancing and retreating guide hole 95 penetrating in the width direction and extending in the longitudinal direction formed on one side, and a first shock absorbing rod 94, A bush 96 accommodated within one end of the shock absorbing cylinder 93 adjacent to the other end of the cylinder body 97, one side of which is accommodated in the shock absorbing cylinder 93 and supported by the bush 96, and the other side of which is a shock absorbing rod. The elastic member (98) elastically supports (94), and the shock buffering cylinder (93) penetrates the advance and retreat guide hole (95) to limit the advance and retreat stroke distance of the shock buffer rod (94) and the shock buffer cylinder (93). ) is provided with a separation prevention bolt (98) that prevents the shock absorbing rod (94) from being separated from the shock absorbing rod (94).

A nut 99 is coupled to one end of the separation prevention bolt 98 protruding from the shock absorbing cylinder 93. At the other end of the shock absorbing rod 94, a ring-shaped hook 97 is provided for coupling so as to be rotatable up and down with respect to the rotational support shaft 13 penetrating the first fixing bracket 11.

The first forward and backward rod 108 is provided with a buffer support shaft 78 that penetrates the buffer guide hole 74 of the pair of buffer support brackets so that the other end is rotatably connected between the pair of buffer support brackets 71. It extends at the other end of the first advance and retreat rod (108) in a direction perpendicular to the longitudinal direction of the first advance and retreat rod (108).

On the other hand, when the extending portion 106 is extended in length and the rear gate 31 is erected with respect to the frame 5, the advancing and retracting rod 108 is lowered with respect to the cylinder body portion 107 due to its own weight, To prevent the rear gate 31 from tilting backward, the shock absorbing part 92 can be extended so that the lengthening part 106 is raised.

Specifically, when the rear gate 31 is rotated to an upright position, the shock absorbing portion 92 extends so that the shock absorbing rod 94 moves into the shock absorbing cylinder 93 and the elastic member 98 contracts. It is formed to elastically support the elongated portion.

Accordingly, as time passes while the rear gate 31 is upright, the advancing/retracting rod 108 is lowered by a predetermined length relative to the cylinder body 107 due to its own weight, and the length of the lengthening portion 106 is reduced. As the length of the elastic member 98, which had been contracted, is restored, the shock absorbing cylinder 93 rises with the length extension portion 106 relative to the shock absorbing rod 94, preventing the rear gate 31 from tilting backward. prevent.

The lower rotating cylinder 131 is coupled to the axis 136 so that one side is rotatable between a pair of second fixing brackets 111, extends, and extends in the other direction of the upper ladder 32 to be described later as a rotating body ( 151).

The lower rotating cylinder 131 includes a second cylinder body portion 134 on one side of which is axially coupled to the second fixing brackets 111 so as to be rotatable between a pair of second fixing brackets 111, and a second cylinder. It is accommodated to be able to advance and retreat on the other side of the main body portion 134 and is provided with a second advance and retreat rod 132 to which the rotating body 151 is connected to the other side.

One side of the rotating body 151 is rotatably mounted on the other side of the lower rotating cylinder 131, and the other side is connected to one side of the lower ladder 52, so that according to the length expansion and contraction of the lower rotating cylinder 131, the lower ladder ( 52) is folded onto the upper ladder 32 or rotated together with the lower ladder 52 so that it unfolds in a straight line.

The rotating body 151 is not limited to the structure shown, but is a pair of first connection bars 38 fixed to the other end of the upper ladder 32 among the plurality of first connection bars 38. Among the first link support brackets 155, one side of which is rotatably coupled to the axis 156, a pair of first link members 152 parallel to each other, and a plurality of second connection bars 58, the lower ladder ( 52), one side of which is rotatably coupled to the axis 158 of a pair of second link support brackets 157 fixed to the second connection bars 58, and a pair of second links parallel to each other. It extends rotatably through the link member 152, the other end of the pair of first link members 152, and the other end of the pair of second link members 153, and the longitudinal center side is the lower rotating cylinder ( It may be provided with a link support shaft 154 connected to the second advance and retreat rod 132 of 131).

Although not shown, the rear gate device 10 for a cargo vehicle with a shock absorbing function according to an embodiment of the present invention includes a fluid supply means and a control unit for driving the upper rotating cylinder 91 and the lower rotating cylinder 131, A control unit is provided.

The fluid supply means is connected to one side and the other side of the upper rotating cylinder 91 and the lower rotating cylinder 131 in each longitudinal direction and supplies fluid into the upper rotating cylinder 91 or the lower rotating cylinder 131 to form the first or second fluid supply lines that allow the advance/retract rods (108, 132) to advance/retract with respect to the upper rotating cylinder (91) or the lower rotating cylinder (131); a fluid storage tank that stores fluid supplied to the fluid supply line; a main fluid supply line extending from the fluid storage tank; a control valve connected between the main fluid supply line and the fluid supply lines and allowing the fluid supply lines to be individually opened or closed under the control of a control unit; A fluid supply pump is provided on one side of the main fluid supply line, pumps the fluid stored in the fluid storage tank, and is connected to the control unit.

The fluid storage tank, control valve, control unit, and operating unit can be mounted on one side of the frame (5). The control valve can be a general electromagnetic valve that is electrically connected to the control unit and driven.

Additionally, the operating unit may be provided with a number of buttons to control the operation of the fluid supply pump and the control belt. The control unit can be mounted on one side of the car body frame and, according to commands from the operating unit, can control the operation of the control valve to drive the fluid supply pump and open and close the fluid supply lines.

In the rear gate device 10 for a cargo vehicle with a shock absorbing function according to an embodiment of the present invention, an upper rotating cylinder 91 for rotating the rear gate 31 is protrudingly mounted on the rear end side of the frame 5 of the vehicle. It has the advantage of being easy to install and maintain by being connected to the first fixing bracket (11).

In addition, the rear gate device 10 for a cargo vehicle with a buffering function according to an embodiment of the present invention includes a buffer guide hole of the buffer support bracket 71 through which the buffer support shaft 78 connected to the upper rotating cylinder 91 penetrates. 74) extends in the form of a long hole in the longitudinal direction of the upper ladder 32, so that as the buffer support shaft 78 moves in the longitudinal direction of the buffer guide hole 74, the load and impact acting on the upper rotating cylinder 91 There is an advantage that durability can be improved because it can be alleviated, and furthermore, cargo unloading efficiency can be improved.

In addition, the rear gate device 10 for a cargo vehicle with a shock absorbing function according to an embodiment of the present invention doubles the impact of the load of the transported equipment transmitted to the length extension portion 106 by the shock absorbing portion 92. It can be cushioned, improving durability and further improving cargo unloading efficiency.

In addition, the rear gate device 10 for a cargo vehicle with a shock absorbing function according to an embodiment of the present invention is designed to react to the fluid supplied into the cylinder body 107 of the lengthening portion 106 while the rear gate is rotated upright. When the advancing/retracting rod 108, which had been raised, is lowered by its own weight and the overall length of the extended portion 106 is reduced, the length of the shortened shock absorbing portion is restored and the extended portion is raised upward, so that the rear gate moves backwards. Tilting can be prevented.

Meanwhile, Figure 6 shows a rear gate 210 device for a cargo vehicle with a buffer function according to another embodiment of the present invention. Components having the same function as in the previously shown drawings are denoted by the same reference numerals.

The rear gate 210 with a buffering function according to another embodiment of the present invention has the same structure as the rear gate 10 according to an embodiment of the present invention except for the upper rotating cylinder 291.

The upper rotating cylinder 291 may be provided with only the first advance/retract rod 108 and the first cylinder body 107 without the shock absorber 92.

One end of the first advance/retract rod 108 of the upper rotating cylinder 291 is rotatably connected to the buffer support bracket 71, and penetrates the first fixing bracket 11 at the other end of the first cylinder body 107. It is connected to the rotational support shaft (13) and is rotatably connected to the first fixing bracket (11).

The present invention described above has been described with reference to an example shown in the drawings, but this is merely illustrative, and various modifications and other equivalent embodiments can be made by those skilled in the art. You will understand.

Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

10: Rear gate device for cargo vehicles with shock absorbing function
11: first fixing bracket 31: rear gate
32: upper ladder 52: lower ladder
71: Buffer support bracket 72: Bracket main body
74: Buffering guide hole 76: Reinforcement rib
78: Buffer support shaft 91: Upper rotating cylinder
111: Second fixing bracket 131: Lower rotating cylinder
151: Rotating body

Claims (5)

A fixing bracket mounted on the rear end of the vehicle frame,
A rear gate including an upper ladder that is mounted on the upper rear end of the frame so as to be rotatable up and down at a position above the fixing bracket and opens and closes the rear of the loading space of the vehicle;
A buffer support bracket mounted on one side of the upper ladder facing rearward when the upper ladder is positioned upright with respect to the frame and positioned vertically above the fixing bracket;
One side is rotatably mounted on the fixing bracket and the other side is rotatably mounted on the buffer support bracket, and an upper rotating cylinder is provided to rotate the upper ladder to open and close the rear of the loading box according to length expansion and contraction,
The buffer support bracket is
Characterized in that a buffer guide hole in the form of a long hole extending in a direction parallel to the longitudinal direction of the upper ladder is formed on the other side of the upper rotating cylinder so that a buffering support shaft connected in a direction perpendicular to the longitudinal direction of the upper rotating cylinder is movably penetrated. Rear gate device for cargo vehicles with shock absorbing function. The method of claim 1, wherein the upper ladder
The ladder main body is mounted on one side to be rotatable up and down by being axially coupled to pivoting support pieces protruding from an upper side of the rear end of the frame, and connects a plurality of length extension bars extending parallel to each other and the plurality of length extension bars. Each comprising a plurality of mutually spaced footrest bars spaced at regular intervals in the longitudinal direction of the length extension bar, and a plurality of sadiri body parts spaced apart from each other in parallel in the width direction of the frame,
The buffer support bracket is
A bracket body portion formed in a plate shape extending parallel to the fixing bracket, supporting a plurality of step bars when rotated so that one side of the upper ladder faces the ground, and having the buffer guide hole formed thereon, and the bracket body portion along the circumference of the buffer guide hole. It is provided with a reinforcing rib that protrudes from the bracket main body,
The bracket body portion extends in length to support the footrest bar and includes a footrest support portion formed with the buffering guide hole, and a plurality of reinforcing protrusions extending between the footrest bars spaced apart from each other in the footrest bar support portion. Functional rear gate device for cargo vehicles. The method of claim 1, wherein the upper rotating cylinder
a shock absorbing part on one side connected to the fixing bracket to cushion the impact of the load or rotation of the transport target equipment applied to the rear gate in the longitudinal direction;
a length extension portion including a forward and backward rod, one side of which is rotatably connected to the buffer support bracket, and a cylinder body portion to which the other side of the forward and backward rod is accommodated to be capable of advancing and retreating, and to which the shock absorbing portion is connected to the other side; The method of claim 3, wherein the shock absorbing unit
When the rear gate is rotated to be upright, the length extension portion is elastically supported in a contracted state, and when the advance and retreat rod is lowered with respect to the cylinder body portion while the rear gate is in an upright state, the length extension portion is raised. A rear gate device for a cargo vehicle with a buffer function, characterized in that it is formed to restore the length. The method of claim 3, wherein the shock absorbing part is
A shock absorbing cylinder extending parallel to the cylinder body from the other end of the cylinder body,
A shock-absorbing rod whose one side is accommodated in the shock-absorbing cylinder so that it can advance and retreat,
Provided with an elastic member accommodated in the shock buffer cylinder to elastically support the shock buffer rod,
The shock-absorbing rod is formed on one side accommodated in the shock-absorbing cylinder with a long forward and backward guide hole that penetrates in the width direction and extends in the longitudinal direction,
The shock buffer rod penetrates the shock buffer cylinder so as to penetrate the advance/retract guide hole, limits the moving distance of the shock buffer rod, and is provided with a separation prevention bolt that prevents the shock buffer rod from separating from the shock buffer cylinder. A rear gate device for cargo vehicles featuring a shock absorbing function.

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