JP4038500B2 - Vehicle handling equipment - Google Patents

Description

  The present invention relates to an improvement of a vehicle handling apparatus having a loading platform for loading and unloading a load when loading and unloading the load, and more particularly, a flap is used to connect a floor surface of a load box and a loading platform. The present invention relates to a cargo handling device.

In Patent Document 1, the base end of the loading platform is cantilevered by a parallel link mechanism, and when the loading platform is used, it is raised and lowered between the ground and the height of the floor of the packing box in a horizontal posture. There is disclosed a cargo handling device configured to store in a vertical posture at a floor height of a cargo box. In this loading / unloading device, an L-shaped flap whose front end is bent at a right angle is connected to the base end of the loading platform so as to be pivotable in the vertical direction. In the state where the floor is at the height of the packing box, the flap is rotated to the packing box side, and the front bent portion is supported by the recessed portion at the rear end of the packing box floor to thereby hold the flap. The floor and the loading platform are connected to each other without any difference. On the other hand, when the loading platform moves up and down between the ground and the floor height of the packing box in a horizontal posture, the flap is tilted to the upper surface of the loading platform so that the bent end protrudes upward, and the protruding tip The bent part prevents the fall of the luggage.
Japanese Patent No. 3392033 (paragraphs 0011 and 0012, FIGS. 2 and 4)

  However, in the cargo handling device of the above-mentioned Patent Document 1, since the turning operation when the flap is passed over the floor surface of the cargo box or tilted to the upper surface of the loading platform is performed manually, it takes time and effort. The efficiency of loading and unloading luggage is reduced.

  The present invention has been made in view of the above points, and an object of the present invention is to efficiently load and unload a load without much labor.

  In order to achieve the above object, the present invention stands up from a state in which a flap is hung on a floor surface of a cargo box by using a movement of the loading platform descending from the floor surface height of the cargo box in a horizontal posture. It is characterized by giving the flap a fall prevention function for the flap.

  Specifically, the present invention moves the loading platform up and down between the ground and the floor height of the packing box in a horizontal posture when in use, and stores it in a vertical posture at the floor height of the packing box when not in use. The following solutions were taken for vehicle handling equipment.

That is, in the first aspect of the present invention, a flap is connected to the base end of the loading platform so as to be raised and lowered , and the flap is turned up and down by the posture changing means. cage, said position changing means has one end is pivotally supported by the first pin to the proximal end of the loading platform, a first link second pin is provided on the other end, the third pin in one end flap A second link in which a substantially L-shaped groove is formed at the other end, the second pin is movably inserted in the groove, and is connected to the first link, and the second link A tension spring that spans between the pin and the third pin and biases the second link toward the first link, and is provided on the third pin, and the second link is rotated downward around the third pin. And a torsion spring When the platform is not in use, the first link and the second link are folded around the second pin by the pressing force of the vertical loading platform, so that the flap is placed between the packing box and the vertical loading platform. When the posture is changed from the vertical posture to the horizontal posture in preparation for using the loading platform, the second pin is moved to one end side of the groove portion of the second link by the spring force of the tension spring and the flap is raised. The spring force of the torsion spring urges the second link to rotate downward around the third pin, moves the second pin to one end of the groove of the second link, and presses the first link and the second link. Keeping the flaps upright so that they do not move relative to each other, and artificially moving the flaps upright while the loading platform is in a horizontal position and at the floor level of the packing box. The second link is rotated upward around the third pin against the spring force of the torsion spring by lowering and rotating the first link and the second link downward around the first pin. The second pin is moved to the other end side of the groove portion of the second link, the relative movement between the first link and the second link is made possible, and the flap is stretched over the floor surface of the packing box to load the floor surface. The first platform and the second link are connected to the first pin when the loading platform descends from the floor height of the cargo box in a horizontal posture with the platform connected to the platform and the flaps hung on the floor surface of the cargo box. The second pin is moved and pressed to one end of the groove portion of the second link by the spring force of the tension spring and pressed so that the first link and the second link do not move relative to each other. Linked to the downward movement of the loading platform And the flaps are automatically raised.

  According to the first aspect of the present invention, when connecting the floor surface of the cargo box and the loading platform with the flap, the flap is artificially laid down and passed over the floor surface of the cargo box. Since the operation of raising the flap to prevent the load is automatically performed in conjunction with the lowering operation of the loading platform, the loading and unloading work can be efficiently performed without much labor. .

Further, the invention according to claim 1, it is possible to easily configure the posture changing means by a combination of links and springs.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  9 to 12 show a cargo handling apparatus A according to an embodiment of the present invention. This cargo handling apparatus A is equipped below a cargo box B at the rear end of a vehicle such as a van equipped with a cargo box B on the vehicle body. This loading / unloading apparatus A includes a loading platform 1 that lifts and lowers a load, and two parallel link mechanisms 2 that cantilever support the base end of the loading platform 1 on both sides. By the synchronous operation of the link mechanism 2, the loading platform 1 is stored in the vertical posture of FIG. 9, the horizontal posture of FIG. 10 is at the floor level of the packing box B, and is grounded in the horizontal posture of FIG. 11. The posture is changed to a state where the tip of FIG. 12 is tilted and grounded.

  9 to 12, b1 is a floor surface of the packing box B, b2 is a double door provided at the rear end of the packing box B, and a buffer pad b3 (see FIG. 9) is provided on the door b2. C is a support frame having a closed cross-sectional shape extending in the vehicle width direction and constituting the vehicle body fixed side. This support frame C is fixed to a chassis frame (not shown) that extends in the vehicle longitudinal direction on both sides in the vehicle width direction. It is fixed through. A first support bracket D2 and a second support bracket D3 are disposed on the side of the support bracket C on the side of the fixed bracket D1.

  On the other hand, both the parallel link mechanisms 2 include a tilt arm 4 whose upper end is pivotally attached to the first support bracket D2 so as to be pivotable in the vertical direction by a connecting shaft 3. Near the upper end of the tilt arm 4, the base end of the lift arm 5 is pivotally mounted on the connecting shaft 6 so as to be rotatable in the vertical direction. The tip of the lift arm 5 is connected to the base end of the loading platform 1 by the connecting shaft 7. It is pivotally mounted so that it can rotate in the vertical direction. A lift cylinder 8 made of a hydraulic cylinder is disposed below the lift arm 5, and a base end of a cylinder tube 8 a of the lift cylinder 8 is pivoted to a lower end of the tilt arm 4 so as to be rotatable up and down by a connecting shaft 9. Further, the tip of the piston rod 8b is pivotally attached to the tip of the lift arm 5 so as to be rotatable in the vertical direction by the connecting shaft 10. A base end of a cylinder tube 11a of a tilt cylinder 11 made of a hydraulic cylinder is pivotally attached to a base end of the loading platform 1 so as to be rotatable in a vertical direction by a connecting shaft 12, and a piston rod 11b of the tilt cylinder 11 The tip is pivotally attached to the second support bracket D3 by a connecting shaft 13 so as to be rotatable in the vertical direction.

  The tilt arm 4, the lift arm 5, the lift cylinder 8 and the tilt cylinder 11 constitute a parallel link mechanism 2. The lift cylinders 8 of the two sets of parallel link mechanisms 2 are loaded on the loading platform 1 by a synchronized expansion and contraction operation. Is raised and lowered between the ground G and the floor height of the packing box B in a horizontal posture (see FIGS. 10 and 11). Both the tilt cylinders 11 of the two sets of parallel link mechanisms 2 change the posture of the loading platform 1 between the horizontal posture and the vertical posture at the floor surface height of the cargo box B by synchronized expansion and contraction operation ( 9 and 10). The two tilt arms 4 of the two parallel link mechanisms 2 are both supported by the weight of the loading platform 1 when the loading platform 1 is grounded in a horizontal posture or by the total load obtained by adding the load of the load to the supporting frame. It rotates around the connecting shaft 3 in a direction away from C, and the tip of the loading platform 1 is tilted forward and lowered to be grounded (see FIGS. 11 and 12). That is, when both the tilt arms 4 are rotated in the direction away from the support frame C, both the lift arms 5 are moved by the rotation so as to be pushed out to the front end side of the loading platform 1, and as a result, the loading platform 1 is It rotates around the connecting shaft 12 and is grounded in a forward tilt posture.

  As shown in FIGS. 1 and 2, a flap 14 is connected to a proximal end of the loading platform 1 by a hinge 15 so as to be raised and lowered. The flap 14 is raised and lowered by rotating vertically with the hinge 15 as a fulcrum by a posture changing device 16 (appears only one in FIGS. 1 and 2) as posture changing means provided on both sides of the flap 14 in the vehicle width direction. It is supposed to be.

  The posture changing device 16 includes a first link 17 and a second link 18. The first link 17 is configured by connecting one end (right end in FIGS. 1 and 2) of two plate members 19 arranged in parallel with a cylindrical member 20, and the cylindrical member 20 is connected to the base of the loading platform 1. A first pin 21 protruding from the end is inserted, and one end of the first link 17 is pivotally supported by the first pin 21 at the base end of the loading platform 1. At the other end of the first link 17 (the left end in FIGS. 1 and 2), a second pin 22 is inserted into and fixed to the two plate members 19.

  The second link 18 is formed of a U-shaped plate material having an upper plate portion 23 and both side plate portions 24, and one end of the second link 18 (see FIG. 1 and FIG. 1) on a third pin 25 protruding from the flap 14. 2 is inserted at the left end), and one end of the second link 18 is pivotally supported on the flap 14 by a third pin 25. A substantially L-shaped groove 24a is formed at the other end (right end in FIGS. 1 and 2) of both side plates 24 of the second link 18 so as to face each other, and the second pin 22 is formed in the groove 24a. A second link 18 is connected to the first link 17 by being inserted movably. An L-shaped lever 26 is fixed to one end (left end in FIGS. 1 and 2) of the upper plate portion 23 of the second link 18 so as to extend inward of the flap 14. The lever 26 is provided only on one side of the flap 14.

  A tension spring 27 made of a coil spring is stretched between the second pin 22 and the third pin 25, and the second link 18 is biased toward the first link 17 by the tension spring 27. . Further, a torsion spring 28 made of a coil spring is fitted on the tip of the third pin 25, one end of the torsion spring 28 is fixed to the third pin 25, and the other end to the second link 18. The second link 18 is urged to rotate downward around the third pin 25 by the spring force of the torsion spring 28.

  When the loading platform 1 is not used, as shown in FIGS. 3 and 9, the first link 17 and the second link 18 are centered on the second pin 22 by the pressing force of the vertical loading platform 1. When folded, the flap 14 is folded and sandwiched between the door b2 of the cargo box B and the loading platform 1 in the vertical posture, and the tip of the flap 14 is brought into contact with the buffer pad b3 of the door b2. In this state, the second pin 22 is located at the corner of the groove 24 a of the second link 18. When the posture is changed from the vertical posture to the horizontal posture in preparation for using the loading platform 1, the second pin 22 is attached to the second link 18 by the spring force of the tension spring 27 as shown in FIGS. 4 and 10. The flap 24a is moved up to one end side (the upper end side in FIG. 4) to erect the flap 14, and the second link 18 is urged downward around the third pin 25 by the spring force of the torsion spring 28. The pin 22 is moved and pressed to one end of the groove portion (the upper end in FIG. 4) of the second link 18 so as to keep the first link 17 and the second link 18 from moving relative to each other so as to keep the flap 14 standing. It has become. Further, as shown in FIG. 6, the flap 14 in the standing state is artificially laid down by stepping on the lever 26 with a person's foot F in a state where the loading platform 1 is in a horizontal posture and at the floor height of the packing box B. At the same time, the first link 17 and the second link 18 are rotated downward around the first pin 21 to rotate the second link 18 upward around the third pin 25 against the spring force of the torsion spring 28. The second pin 22 is moved to move to the other end side (the right end side in FIG. 6) of the groove portion 24a of the second link 18, allowing relative movement between the first link 17 and the second link 18, and the flap. By stepping 14 together with the lever 26 with a person's foot F, the flap 14 is passed over the floor surface b1 of the cargo box B so that the floor surface b1 and the loading platform 1 are connected. Furthermore, as shown in FIGS. 7 and 8, the loading platform 1 descends from the floor surface height of the packing box B in a horizontal posture with the flap 14 hung on the floor surface b1 of the packing box B. The first link 17 and the second link 18 are rotated upward around the first pin 21, and the second pin 22 is connected to one end of the groove 24 a of the second link 18 by the spring force of the tension spring 27 (upper end in FIG. 8). So that the first link 17 and the second link 18 do not move relative to each other. In this process, the tension spring 27 exceeds the dead point so that the flap is interlocked with the lowering operation of the loading platform 1. 14 is automatically erected. 2 to 8, the parallel link mechanism 2 is omitted.

  Next, the operation of the cargo handling apparatus A configured as described above will be described.

  (1) FIGS. 3 and 9 show the loading platform 1 stored in a vertical posture. In this retracted state, both lift cylinders 8 and both tilt cylinders 11 of the two sets of parallel link mechanisms 2 are extended, and the lift arm 5, lift cylinder 8 and tilt cylinder 11 are rotated upward to rearward the vehicle body. Holds an upwardly tilted posture. In this state, the flap 14 folds the first link 17 and the second link 18 around the second pin 22 by the pressing force of the loading platform 1 in the vertical posture, and thereby the door b2 of the cargo box B and It is folded and sandwiched between the vertical loading platform 1 and the tip of the flap 14 is in contact with the buffer pad b3 of the door b2. In this state, the second pin 22 is located at the corner of the groove 24 a of the second link 18.

  (2) To shift the loading platform 1 from the retracted state to the in-use state, the hydraulic pressure is discharged from the non-rod-side working chambers of the two tilt cylinders 11 of the two parallel link mechanisms 2. Thereby, both the tilt cylinders 11 are contracted and operated in synchronization with each other, and the loading platform 1 is in a horizontal posture at the height of the floor surface of the packing box B as shown in FIGS. In this state, the flap 14 stands by moving the second pin 22 to one end side (the upper end side in FIG. 4) of the second link 18 by the spring force of the tension spring 27, and the spring force of the torsion spring 28. Thus, the second link 18 is urged to rotate downward around the third pin 25, and the second pin 22 moves to one end (the upper end in FIG. 4) of the groove portion 24a of the second link 18. The upright state of the flap 14 is maintained so as not to move relative to the link 18.

  (3) The hydraulic pressure is discharged from the non-rod side working chambers of both lift cylinders 8, whereby both lift cylinders 8 are contracted in synchronization to rotate the lift arm 5, lift cylinder 8 and tilt cylinder 11 downward. Then, as shown in FIG. 5, the loading platform 1 is lowered in a horizontal posture from the floor surface height of the cargo box B to the extent that the flap 14 does not interfere with the door b <b> 2 of the cargo box B, and the door b <b> 2 is opened.

  (4) Supply hydraulic pressure to the non-rod-side working chambers of both lift cylinders 8, thereby causing both lift cylinders 8 to extend in synchronism and rotate the lift arm 5, lift cylinder 8 and tilt cylinder 11 upward. Then, as shown in FIG. 6, the loading platform 1 is raised to the floor height of the packing box B. In this state, the lever 26 is stepped on with a person's foot F to artificially fall the flap 14 in the standing state, and the first link 17 and the second link 18 are rotated downward around the first pin 21. The second link 18 is rotated upward around the third pin 25 against the spring force of the torsion spring 28, and the second pin 22 is moved to the other end side of the groove 24a of the second link 18 (right end side in FIG. 6). The first link 17 and the second link 18 are allowed to move relative to each other, and the flap 14 is stepped on with a person's foot F together with the lever 26, whereby the flap 14 is placed on the floor b1 of the cargo box B. It passes over and the floor surface b1 and the loading platform 1 are connected. In this state, the luggage is loaded from the packing box B onto the loading platform 1.

  (5) The hydraulic pressure is discharged from the non-rod side working chambers of both lift cylinders 8. As a result, the lift cylinders 8 are contracted in synchronization with each other, and the lift arm 5, the lift cylinder 8 and the tilt cylinder 11 are rotated downward, so that the flap 14 is placed on the floor surface of the cargo box B as shown in FIG. The loading platform 1 starts to descend in a horizontal posture from the floor surface height of the packing box B in a state of being hung over b1. As a result, as shown in FIG. 8, the first link 17 and the second link 18 rotate upward around the first pin 21, and the second pin 22 is moved to the second link 18 by the spring force of the tension spring 27. The first link 17 and the second link 18 do not move relative to each other and are pressed against one end (the upper end in FIG. 8) of the groove portion 24a. In this process, the tension spring 27 exceeds the dead point. The flap 14 automatically stands up in conjunction with the downward movement of the loading platform 1. Accordingly, the falling of the load can be prevented by the flap 14 in the standing state in the process of unloading the load.

  (6) The loading platform 1 descends and grounds in a horizontal posture as shown in FIG. In this grounded state, the loading platform 1 rotates around the connecting shaft 3 in a direction away from the support frame C by its own weight or a total load obtained by adding the load of the load, and accordingly, both the tilt arms 4 are moved. When rotating in a direction away from the support frame C, both lift arms 5 move so as to be pushed out to the tip side of the loading platform 1, and the parallel state of the two sets of parallel link mechanisms 2 breaks down. Rotate around the connecting shaft 12 as shown in FIG. With this forward leaning posture, the luggage is unloaded from the loading platform 1.

  (7) Next, when returning the loading platform 1 to the retracted state of the vertical posture, the hydraulic pressure is supplied to the anti-rod side working chambers of the lift cylinders 8 after closing the door b2 of the packing box B. As a result, the lift cylinders 8 are extended in synchronization with each other, and the loading platform 1 is rotated around the connecting shaft 12 to return to the horizontal posture shown in FIG. 11, followed by the lift arm 5, the lift cylinder 8 and the tilt. The cylinder 11 rotates upward, and the loading platform 1 rises in a horizontal posture to the floor surface height of the packing box B as shown in FIG. Thereafter, hydraulic pressure is supplied to the non-rod side working chambers of the two tilt cylinders 11 and the two tilt cylinders 11 are operated to extend in synchronization to rotate the loading platform 1 around the connecting shaft 7 to the vertical posture of FIG. Store. As a result, the first link 17 and the second link 18 are folded around the second pin 22 by the pressing force of the loading platform 1 in the vertical position, and the flap 14 and the door b2 of the packing box B are loaded in the vertical position. The flap 14 is sandwiched between the stacking platform 1 and the tip of the flap 14 comes into contact with the buffer pad b3 of the door b2.

  On the other hand, when the load is loaded into the load box B after the load is unloaded in the step (6), the hydraulic pressure is supplied to the anti-rod side working chambers of the lift cylinders 8. As a result, the lift cylinders 8 are extended in synchronization with each other, and the loading platform 1 is rotated around the connecting shaft 12 to return to the horizontal posture shown in FIG. 11, followed by the lift arm 5, the lift cylinder 8 and the tilt. The cylinder 11 rotates upward, and the loading platform 1 rises in a horizontal posture to the floor surface height of the packing box B as shown in FIG. During this time, since the flap 14 is kept in the standing posture, it is possible to prevent the load from falling from the loading platform 1 when the load is loaded into the load box B. Thereafter, as shown in FIG. 6, the lever 26 is stepped on with the person's foot F to artificially lie down the flap 14 in the standing state, and the first link 17 and the second link 18 are moved downward around the first pin 21. By rotating, the second link 18 is rotated upward around the third pin 25 against the spring force of the torsion spring 28, and the second pin 22 is moved to the other end side of the groove 24a of the second link 18 (see FIG. 6, the first link 17 and the second link 18 are allowed to move relative to each other, and the flap 14 is stepped on together with the lever 26 by a person's foot F. The floor surface b1 is connected to the loading platform 1 over the floor surface b1. In this state, the luggage is loaded from the loading platform 1 into the packing box B. When the loading of the load is completed and the loading platform 1 is stored in the vertical posture in FIG. 9 from the horizontal posture at the floor surface height of the packing box B in FIG. 10, the flap 14 is passed through the step (5) above. , The interference between the flap 14 and the door b2 of the cargo box B is avoided through the step (3), and the door b2 is closed from this state. Thereafter, the loading platform 1 is raised to the height of the floor surface of the packing box B. From this state, hydraulic pressure is supplied to the non-rod-side working chambers of both tilt cylinders 11 and both the tilt cylinders 11 are operated to extend in synchronization. The stacking platform 1 may be rotated around the connecting shaft 7. As a result, the first link 17 and the second link 18 are folded around the second pin 22 by the pressing force of the loading platform 1 in the vertical position, and the flap 14 and the door b2 of the packing box B are loaded in the vertical position. The flap 14 is sandwiched between the stacking platform 1 and the tip of the flap 14 comes into contact with the buffer pad b3 of the door b2.

  Thus, in this embodiment, when connecting the floor surface b1 of the load box B and the loading platform 1 with the flap 14, the flap 14 is artificially laid down to the floor surface b1 of the load box B. However, since the raising operation of the flap 14 for preventing the falling of the load is automatically performed in conjunction with the lowering operation of the loading platform 1, the loading of the load can be performed without much labor. Unloading work can be performed efficiently.

  Further, in this embodiment, the posture changing device 16 for raising and lowering the flap 14 can be easily configured by combining the first link 17 and the second link 18 with the tension spring 27 and the torsion spring 28.

  The present invention relates to a vehicle loading device having a loading platform that loads and lifts a load when loading and unloading the load, as a loading device that communicates the floor surface of the packing box and the loading platform with a flap. Useful.

It is a principal part enlarged plan view which shows the state which spanned the flap on the floor surface of the packing box. It is a principal part enlarged side view which shows the state which spanned the flap on the floor surface of the packing box. It is a principal part enlarged side view which shows the attitude | position of the flap in the retracted state of a loading platform. It is a principal part enlarged side view which shows the attitude | position of the flap in the state which the loading platform is in the floor surface height of a packing box in a horizontal attitude | position. It is a principal part expanded side view which shows the state which slightly lowered the loading platform in the horizontal posture from the floor surface height of the packing box in order to open the door of the packing box. It is a principal part expanded side view which shows the state which raised the loading platform to the floor surface height of the cargo box in the horizontal posture, and overlaid the flap on the floor surface of the cargo box. It is a principal part expanded side view which shows the attitude | position of the flap in the initial stage which descends a loading platform in a horizontal attitude | position from the floor surface height of a cargo box. It is a principal part enlarged side view which shows the state which the flap stood up from the state of FIG. It is a side view which shows the storage state of a loading platform. It is a side view which shows the state which a loading platform exists in the floor surface level of a packing box in a horizontal attitude | position. It is a side view which shows the state which the loading platform contact | grounded in the horizontal attitude | position. It is a side view which shows the state which inclined the loading platform front-end | tip and was earth | grounded.

Explanation of symbols

1 Loading platform 14 Flap 16 Posture change device (posture change means)
17 first link 18 second link 21 first pin 22 second pin 24a groove 25 third pin 27 tension spring 28 torsion spring A cargo handling device B cargo box b1 floor G ground

Claims (1)

A loading and unloading device for a vehicle that moves up and down between the ground and the floor height of the packing box in a horizontal posture when using the loading platform, and stores it in a vertical posture at the floor height of the packing box when not in use.
A flap is connected to the base end of the loading platform so as to be raised and lowered,
The above flap is designed to turn up and down by the posture changing means,
The posture changing means includes a first link having one end pivotally supported by a first pin at the base end of the loading platform and a second pin provided at the other end;
One end is pivotally supported by a third pin on the flap, and a substantially L-shaped groove is formed on the other end. The second pin is movably inserted into the groove and connected to the first link. 2 links,
A tension spring that is spanned between the second pin and the third pin and biases the second link toward the first link;
A torsion spring provided on the third pin for rotating and biasing the second link around the third pin;
When the loading platform is not used, the first link and the second link are folded around the second pin by the pressing force of the vertical loading platform, so that the flap is placed between the packing box and the vertical loading platform. Fold between and pinch
When the posture is changed from a vertical posture to a horizontal posture in preparation for use of the loading platform, the second pin is moved to one end side of the groove portion of the second link by the spring force of the tension spring to raise the flap, and the torsion spring The second link is biased to rotate downward around the third pin by the spring force of the second link, and the second pin is moved and pressed to one end of the groove portion of the second link to relatively move the first link and the second link. To keep the flaps upright,
While the loading platform is in a horizontal position and is at the floor level of the packing box, the standing flap is artificially laid down and the first link and the second link are rotated downward around the first pin. The second link is rotated upward around the third pin against the spring force of the torsion spring to move the second pin to the other end side of the groove portion of the second link, and the first link and the second link The relative movement of the floor and the flap across the floor of the packing box to connect the floor to the loading platform,
The first and second links rotate upward around the first pin when the loading platform is lowered from the floor height of the cargo box in a horizontal position with the flaps hung on the floor of the cargo box. And moving the second pin to one end of the groove portion of the second link by the spring force of the tension spring and pressing the second pin so that the first link and the second link do not move relative to each other. A vehicle loading / unloading device characterized by automatically raising a flap in conjunction with the vehicle.

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