JPH054258B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a hinge shaft mounting structure of a cargo handling device for a cargo handling vehicle, and more specifically, to a rotation of a lift arm for loading and unloading a removably supported container onto a vehicle body. This invention relates to an improvement in the mounting structure that aims to integrate the hinge shaft, which is the center of movement, with both lift arms.

[Prior Art] A cargo handling vehicle 1 for transporting a container 3 shown in FIG. 10 is equipped with a cargo handling device 2 for loading and unloading the container 3 onto the vehicle. In order to handle the container 3 with the cargo handling device 2, it is necessary to support the container 3, and support shafts 4 are installed on the left and right sides of the container 3.
is displayed. In order to receive the support shaft 4, the cargo handling device 2 is provided with a lift arm 5 formed by a support portion 6, and is attached to the vehicle body 7 via a hydraulic cylinder 8 and a hinge shaft 9A so as to be rotatable forward and backward.

In the case of the cargo handling device 2 having this type of lift arm, the container 3 is supported by the lift arms 5, 5 via a pair of left and right support shafts 4, 4, and the mounting position of the support shafts 4 is determined. is container 3
The container 3 is placed above the center of gravity of the container 3, and is designed to prevent the container 3 from wobbling during cargo handling. In the structure and operation described above, the lift arm 5 and the hinge shaft 9A are firmly integrated, while the shaft bearing part that reliably supports the hinge shaft 9A, on which the entire weight of the container 3 acts, is provided on the vehicle body 7. It is provided.

By the way, the present applicant has described a structure in which a hinge shaft, which is the center of rotation of a lift arm, is supported on both sides of the vehicle body in a cargo handling vehicle proposed in Japanese Patent Application Laid-Open No. 63-11458. The tip of the hinge shaft extends to the outside of the vehicle body, and the extended part is fitted into a holding member fixed to the lower end of the lift arm, and between the holding member and the hinge shaft there is a structure that allows the inner and outer diameters to be expanded and contracted. By interposing the coupling member, the lift arm and the hinge shaft are integrated via the holding member.

That is, as shown in FIG. 11, the large diameter portions at the left and right ends of the hinge shaft 9A extending in the left-right direction of the vehicle body are connected to the vehicle frame 18 that constitutes the frame of the vehicle body 7.
The extending portion 9M at the tip of the hinge shaft 9A is inserted into the insertion hole 42A of the holding member 42 integrated with the lift arm 5. When the lift arm 5 rotates around the hinge shaft 9A due to expansion and contraction of the hydraulic cylinder 8, the hinge shaft 9A rotates together with the lift arm 5 integrated with the holding member 42.

The hinge shaft 9A has both lift arms 5,
5, while synchronizing the rotation of both lift arms 5, 5. This synchronization function is made possible by reliably integrating the lift arm 5 and the hinge shaft 9A. If this is integrated by welding, it will have to be cut each time the hinge shaft 9A is replaced, but if it is integrated using a key, the key grooves provided on the hinge shaft 9A and the holding member 42 will have to be cut. It is labor intensive and requires extremely high precision machining. Even if you try to integrate it by interlocking splines,
It is unsuitable for tuning because it causes vibration due to pitch-to-pitch errors.

Therefore, in order to synchronize the left and right lift arms 5, 5, a coupling member 43 is employed to integrate the holding member 42 and the hinge shaft 9A.

This coupling member 43 is the same as the coupling member 23 shown in FIG. 7 which will be explained in the present invention, so a detailed explanation will be omitted here, but as can be seen from FIG. It is inserted from the side, and the side surface of the holding member 42 is covered.

Adopting this type of connection makes replacing the hinge shaft much easier than integrating by welding, and also eliminates the need for high-precision machining compared to key connections or spline fittings. , it has the advantage of simple structure and installation work.

Incidentally, in consideration of the large load acting on the lift arm 5, the hinge shaft 9A is directly or indirectly supported on the side frame member 18b of the strong vehicle frame 18 as described above. Therefore,
The tip portion of the hinge shaft 9A integrated with each lift arm 5 is supported in a cantilevered manner with the shaft supporting portion on only one side. Therefore, a wide space is secured outside the lift arm 5, and the work of interposing and fixing the above-mentioned coupling member becomes easy.

On the other hand, when the vehicle body is viewed from above, the arrangement is as shown in FIG. 12. That is, as described above, the hinge shaft 9A is extended laterally, and the lift arm 5 is mounted so as to protrude from the side frame member 18b of the vehicle frame 18. Such a form is also seen in Japanese Patent Application Laid-open No. 18430/1983.

[Problem to be solved by the invention]

However, when the lift arms 5, 5 support the container 3, the entire weight of the container 3 is concentrated on the extended portion 9M of the hinge shaft 9A. In the case of the hinge shaft 9, the load is supported like a cantilever beam,
Deformation and stress increase significantly. As a result, there is a problem in that material fatigue in the hinge shaft progresses easily and the frequency of replacement increases.

In addition, the hinge shaft 9A protrudes from the side of the vehicle 1, and the lift arms 5, 5 integrated with the hinge shaft protrude toward the vehicle side, as shown in FIG. 12. Furthermore, since an appropriate number of coupling members are interposed in the holding member, it is necessary to increase the width of the holding member fixed to the lower part of the lift arm. As described above, there is a problem in that the vehicle width increases due to the overhang of the lift arm and the widening of the holding member.

The present invention was made to solve the above-mentioned problems, and its purpose is to improve the bearing structure at the left and right ends of the hinge shaft to suppress material fatigue, and to improve the integration of the hinge shaft and lift arm. It is an object of the present invention to provide a hinge shaft mounting structure for a cargo handling device for a cargo handling vehicle, which can reduce the amount of protrusion toward the vehicle side and suppress an increase in vehicle width as much as possible.

[Means to solve the problem]

The present invention supports the left and right sides of the container by a pair of lift arms provided on the left and right sides of the vehicle body, which can rotate synchronously in the front and rear directions around a hinge shaft extending in the left and right direction of the vehicle body. A cargo handling device for a cargo handling vehicle that is capable of loading a container on the ground at the rear of the vehicle onto the vehicle by rotating the lift arm forward, and unloading the container on the ground at the rear of the vehicle by rotating the lift arm backwards. Applicable.

Its features include, as shown in FIGS. 1 and 2, the lower end of each lift arm 5 has a small diameter hole 21b into which the hinge shaft 9 can be inserted; A holding member 21 having a stepped space having a large diameter hole 21a opening inward is fixed.

By displacing the wedge member 29 (see FIG. 7) in the left-right direction, a tapered surface M is formed between the hinge shaft 9 inserted through the holding member 21 and the hole surface of the large diameter hole 21a. Outer ring material 28 whose diameter is enlarged and comes into pressure contact with the large diameter hole 21a (see FIG. 7)
A connecting member 23 is interposed, which includes an inner ring member 27 whose diameter is reduced and presses against the hinge shaft 9, and which can integrate the lift arm 5 and the hinge shaft 9 via the holding member 21.

An outer plate member 20A and an inner plate member 20B are located inside and outside of each lift arm 5 and extend in the front-rear direction on a side frame member 28b that is located below the lift arm 5 and forms the vehicle frame 18 of the loading platform (see FIG. 5). A support frame body 19 having the following is attached.

An outer support ring 24 is attached to the outer plate material 20A, and the outer support ring 24 supports the tip of the hinge shaft 9 on the outside of the holding member 21.
In B, the hinge shaft 9 is connected to the lift arm 5.
An inner support ring 25 is mounted on the inner side of the shaft.

The inner support ring 25 includes a large support tube 26B provided with an insertion hole 26d through which the coupling member 23 inserted into the hinge shaft 9 in advance can be moved into the holding member 21, and a large support tube 26B that is fitted into the insertion hole 26d. It consists of a small support cylinder 26A fixed to support the hinge shaft 9. The hinge shaft 9 is supported on both sides of each lift arm 5 by an outer support ring 24 and an inner support ring 25, respectively.

[Effect]

Lift arms 5, 5 integral with the holding member 21 are arranged on the vehicle, and the holding member 21 is attached to the outer panel material 20 of the support frame 19 provided on the side frame material 18b of the vehicle frame 18.
It is inserted between the outer support ring 24 attached to A and the large support tube 26B of the inner support ring 25 attached to the inner plate material 20B so that their axes are aligned. For example, when the hinge shaft 9 is inserted through the right outer support ring 24 and the left end passes through the holding member 21 and the coupling member 23 and comes out from the large support tube 26B, the right side small support tube 26A and the left side small support tube 26A are inserted. and the coupling member 23 is inserted into the hinge shaft 9 and left there.

Next, the left end of the hinge shaft 9 is inserted through the left large support tube 26B, the holding member 21, and the outer support ring 24. Adjust the positions of the left end and right end of the hinge shaft 9, and insert each coupling member 23 into the insertion hole 26 of the main support tube 26B.
d between the hinge shaft 9 in each holding member 21 and the hole surface of the large diameter hole 21a.
The wedge member 29 of the coupling member 23 is displaced in the left-right direction, and the diameter of the outer ring material 28 is expanded through the tapered surface M and pressed into contact with the large diameter hole 21a, while the diameter of the inner ring member 27 is reduced and pressed into contact with the hinge shaft 9. Then, the connecting member 23 is firmly fixed. Finally, the right side small support cylinder 26A is fitted into the large support cylinder 26B, and the left side small support cylinder 26A is fitted into the large support cylinder 26B to support and fix the hinge shaft 9.

As a result, the hinge shaft 9 and the lift arms 5, 5 are integrated through the coupling member 23 and the holding member 21, and each hinge shaft 9 is supported at both positions of the outer plate material 20A and the inner plate material 20B on both sides thereof. Ru.

〔Effect of the invention〕

According to the present invention, each end of the hinge shaft can be supported on both sides of each lift arm, so that the bearings at the left and right ends of the hinge shaft are supported on both sides, and the form of load support is significantly improved.
Therefore, the deformation and stress that occur in the hinge shaft can be reduced, the strength of the hinge shaft is increased, and the progression of material fatigue is suppressed.
The frequency of replacing the hinge shaft can be significantly reduced.

In addition, each lift arm can be supported by a support frame disposed on the side frame member of the vehicle frame forming the cargo platform, and the load acting on the lift arm can be directly supported by the vehicle frame in a dual-supported manner. There is no longer a need to attach a lift arm that extends laterally from the vehicle frame, and an increase in vehicle width due to attachment of the lift arm is avoided. Of course, the fixing operation using the coupling member can be easily performed from the inside, and the width of the outer support ring is not required to be large, so that the increase in vehicle width can be suppressed as much as possible.

〔Example〕

The present invention will be described in detail below based on examples thereof.

FIG. 2 shows an example of a cargo handling vehicle 1, in which a container 3, which can be attached to and detached from a cargo handling device 2, can be loaded and unloaded onto a vehicle body 7. The car body 7 has a container 3
A pair of left and right lift arms 5, 5 (see Figure 3) are attached to support and unload the vehicle body 7.
It is supported so as to be rotatable back and forth around a hinge shaft 9 fixed to.

A recessed support portion 6 is formed on the tip side of the main body of the lift arm 5, and an edge portion is provided in the front and back direction, and the support portion 6 engages with the support shaft 4 extending to the left and right of the container 3. The container 3 is supported by the container 3. Note that when the lift arm 5 rotates back and forth, the support shaft 4 rotates and slides on the support portion 6 and rolls in response to the back and forth rotation, thereby loading and unloading the container 3. Incidentally, a connecting rod 33 is attached above the hinge shaft 9 at the rear lower end of the left and right lift arms 5, 5, and the two are integrated to synchronize rotation and increase rigidity.

The lift arm 5 is configured to be rotated forward and backward by the expansion and contraction movement of a hydraulic cylinder 8 that is swingably mounted on the vehicle body 7. The tip of each piston rod is attached to both the left and right lift arms 5 via a pin shaft 10, and when the piston rods are extended, the lift arms 5 sequentially rotate backward as shown in the imaginary line. In addition, support frame bodies 1 to be described later on the left and right sides of the vehicle body 7
An outrigger 35 having a built-in hydraulic jack 34 is installed at the rear lowest end of the vehicle 9 to prevent the vehicle body 7 from taking a head-up position due to the weight of loading and unloading the container 3 by the cargo handling device 2.

As described above, in the cargo handling vehicle to which the present invention is applied, the hinge shaft 9 extending in the left-right direction of the vehicle body 7
The left and right sides of the container 3, whose upper surface is open, are supported by a pair of lift arms 5, 5 provided on the left and right sides of the vehicle body, which can rotate synchronously in the front and rear direction around the center.
The container 3 on the ground at the rear of the vehicle body can be loaded onto the vehicle body by forward rotation of the lift arm 5 by the operation of the hydraulic cylinder 8, and the container 3 on the vehicle body can be unloaded onto the ground at the rear by the backward rotation of the lift arm 5. It's getting old.

In this example, in order to maintain the horizontal position of the container 3 while it is rotating back and forth and to ensure smooth loading and unloading work, the container 3 rotates back and forth around the support shaft 12 shown in FIG. 4. A front arm 13 formed in a dogleg shape is provided. Note that a hydraulic cylinder 11 is provided via a pin shaft 17 to tilt this front arm 13, but this is not for loading and unloading the container 3, but for independently rotating the front arm 13 forward and backward. be.

A hook 15 is attached to the upper end of the front arm 13, and the hook 15 opens and closes according to the expansion and contraction of the hydraulic cylinder 14, and the hook 15 holds a clamping shaft 16 (see FIG. 2) located at the upper front part of the container 3. It's becoming like that. The imaginary side connecting the support shaft 4 of the container 3 and the clamping shaft 16 and the imaginary side connecting the support shaft 12 of the front arm 13 and the hinge shaft 9 of the lift arm 5 are parallel and have the same length. , a parallelogram having the support shaft 4, the clamping shaft 16, the support shaft 12, and the hinge shaft 9 as vertices is formed. Therefore, by the extension of the hydraulic cylinder 8, the container 3 is unloaded while maintaining a horizontal attitude, and is also loaded by contraction.

On the other hand, as shown in FIG. 5, the lower frame of the vehicle body 7 is formed of a rectangular vehicle frame 18.
It is reinforced by three sub-frames 18A, 18B, and 18C extending left and right on the same level. Note that two vertical frames 18M and 18N extending back and forth are attached to the front frame member 18a of the vehicle frame 18 and the three sub-frames to allow the container 3 to be mounted thereon. Among such frame structures, the left and right side frame members 18 of the vehicle frame 18
A support frame body 19 having an outer panel material 20A and an inner panel material 20B is attached to the upper part of the vehicle frame 18 from the front to the rear of the vehicle body 7 without protruding significantly to the side of the vehicle frame 18.

The support frame 19 extends downward at the rear of the vehicle body 7, as shown in FIG. In this example, a U-shaped member is employed as the support frame 19 and is mounted on the side frame member 18b, and the above-mentioned hydraulic cylinder 8 is mounted inside the U-shaped member. In addition, the outer panel material 20 extending in the fore-aft direction described above
A and the inner plate material 20B are located inside and outside of each lift arm 5.

FIG. 6 is a rear view of FIG. 4, and in FIG. 1, which is an enlarged view of the left side thereof, a holding member 21 is fixed to the lower rear end of the lift arm 5. The lift arm 5 extends in the left and right direction of the vehicle body 7.
A stepped vehicle having a small diameter hole 21b shown in FIG. 7 through which the hinge shaft 9, which is the center of rotation of the vehicle, can be inserted, and a large diameter hole 21a that is connected to the small diameter hole 21b and opens inward of the vehicle body 7. It has space. That is, the large opening 21a, which is a large diameter hole, faces inward, and the small opening 21b, which has a small diameter hole, faces outward (see FIG. 1). In addition,
It goes without saying that the right lift arm 5 is arranged symmetrically to the left side (see FIG. 8).

The holding member 21 has a first
As shown in the figure, a flange portion 21c is provided, and when the holding member 21 is attached to the lower rear end of the lift arm 5 and then fixed by welding or the like, the flange portion 21c comes into contact with the outer surface of the lift arm 5. are positioned in contact with each other. When the hinge shaft 9 is inserted into the space formed by the large opening 21a and the small opening 21b, an annular space is formed,
Two coupling members 23, 23 are inserted therein.

As will be described later, this coupling member 23 can expand and contract in the radial direction of the inserted hinge shaft 9, and firmly integrates the lift arm 5 and the hinge shaft 9 via the holding member 21.

An outer support ring 24 that supports the hinge shaft 9 on the outside of the lift arm 5 is attached to the outer plate material 20A of the support frame 19 described above, and the hinge shaft 9 is supported by a bearing metal 24m inserted into the outer support ring 24. The end of the is supported. Inner plate material 20 of the support frame 19
An inner support ring 25 consisting of a small support cylinder 26A and a large support cylinder 26B is attached to B, and the small support cylinder 26A supports the hinge shaft 9 on the inside of the lift arm 5 with an inserted bearing metal 26m. . Therefore, the lift arm 5, on which a large load is applied, is supported on both sides at its left and right portions, and care is taken to prevent the lift arm 5 from being cantilevered on the hinge shaft 9.

In this example, the main support tube 26B is the inner plate material 20B.
When it is attached to and integrated with the inner plate member 20B, the flange portion 26b formed on the main support tube 26B is brought into contact with the inner surface of the inner plate member 20B to be positioned. When the hinge shaft 9 is inserted into the holding member 21 through the insertion hole 26d of the large support tube 26B, the holding member 21
An annular space for fixing the coupling member 23 is formed inside. A small support tube 26A for covering the entrance of the space is fitted inside the large support tube 26B. At the time of fitting, the flange portion 26a of the small support tube 26A is brought into contact with the large support tube 26B and positioned, and then the two are integrated with the bolt 26c. The inner side portion of the end of the hinge shaft 9 is supported by the small support cylinder 26A.

The outer diameter of the small support tube 26A and the inner diameter of the large support tube 26B are selected so as to facilitate adjustment of the diameter of the coupling member 23 in the space and to facilitate assembly of the small support tube 26A.

As shown in FIG. 7, the above-mentioned coupling member 23 includes an annular inner ring member 27 surrounding the hinge shaft 9, an annular outer ring member 28 located on the hole side of the large diameter hole 21a, and a conical outer ring member 28. Formed tapered surface M
Wedge members 29, that is, conical members 29A, 29, which are in contact with the inner ring material 27 and the outer ring material 28 through the tapered surface M and are slidable on the tapered surface M.
B and bolt 30. A threaded portion into which a bolt 30 is screwed is formed at the center of the conical member 29B, and an insertion hole for the bolt 30 is formed in the conical member 29A. Therefore, when a tightening rotary tool is inserted into the hexagonal hole 30a formed in the head of the bolt 30 and screwed in, the conical member 29A moves in the direction of arrow 31, and the conical member 29B moves in the direction of arrow 32.

A slit (not shown) is cut into the inner ring member 27 and the outer ring member 28 in the direction in which the bolt 30 is inserted, so that the inner ring member 27 and the outer ring member 28 can expand and contract in the circumferential direction. As a result, by threading the bolt 30, the conical member 29
A and 29B approach each other, and the diameter of the inner ring material 27 is reduced inward through the tapered surface M, thereby forming the hinge shaft 9.
is pressed to expand the diameter of the outer ring material 28 and open the large opening 21.
The hole surface of a can be pressed.

In this way, the large diameter hole 21 in the holding member 21
Between a and the inserted hinge shaft 9, there are members 27, 2 whose diameter changes via the tapered surface M by displacing the wedge member 29 in the left-right direction.
8, the lift arm 5 and the hinge shaft 9 can be firmly integrated via the holding member 21.

Hinge shaft 9 with the above mounting structure
is incorporated into the vehicle body and integrated with the lift arm 5 in the following manner, and becomes the center of rotation thereof.

First, the procedure for assembling the lift arm 5 and the hinge shaft 9 will be explained. As shown in Fig. 8, the left and right lift arms 5, 5, which are connected by the connecting rod 33 (see Fig. 1) and are integrated, are lifted up by a crane or the like, and the holding member 21 at the lower rear end is removed. It is lowered between the large support tube 26B of the support ring 24 and the inner support ring 25. Then, the outer surface of the holding member 21 is brought into contact with the inner surface of the outer support ring 24, and the inner surface is brought into contact with the outer surface of the large support tube 26B, so that the axes of the outer support ring 24, the large support tube 26B, and the holding member 21 are aligned. let

Next, the left end 9a of the hinge shaft 9 is inserted, for example, into the right outer support ring 24, the holding member 21, the coupling member 23, and the large support cylinder 26B of the inner support ring 25, and the left end 9a is inserted between the lift arms 5, 5. When it is located around the center, insertion will be paused. Then, as shown in FIG. 9, the right side and left side small support rings 26A are inserted into the hinge shaft 9 from the left end 9a, and then the left side connecting members 23, 23 shown by two imaginary lines are inserted. Insert.

At this time, the diameter of the inner ring member 27 shown in FIG. 7 is expanded in a direction away from the axis of the hinge shaft 9, and the diameter of the outer ring member 28 is reduced so as to approach the axis of the hinge shaft 9. In other words, it is in a state where it can be easily inserted with a gap left. Subsequently, as shown in FIG. 8, the hinge shaft 9 is inserted through the left large support ring 26B, the holding member 21, and the outer support ring 24.

Next, adjust the ends 9a, 9b of the hinge shaft 9 to the desired positions, insert one of the two connecting members 23, 23 located on the left end into the holding member 21, and tighten the bolt 30. Turn the inner ring material 27
The diameter of the outer ring member 28 is reduced so as to strongly abut against the hinge shaft 9, while the diameter of the outer ring member 28 is expanded so as to strongly abut against the inner circumferential surface of the large opening 21a. Since two coupling members 23 are employed in this example, the diameter of the remaining one is similarly changed.

When the two connecting members 23 on the right side are similarly changed in diameter and assembled, the hinge shaft 9 is firmly integrated with the lift arms 5, 5 via the holding member 21. The hinge shaft 9 is supported at both ends 9a and 9b by a bearing metal 24m of the outer support ring 24 at the position of the outer panel material 20A of the support frame 19. As shown in FIG. 1, the left and right small support rings 26A resting on the hinge shaft 9 are moved toward the left end 9a and the right end 9b, and the flange portion 26a is brought into contact with the inner surface of the large support ring 26B for positioning. Fix with bolt 26c. As a result, the hinge shaft 9 is supported in contact with the bearing metal 26m of the small support ring 26A at the position of the inner plate 20B of the support frame 19, and the integration and assembly of the hinge shaft 9 is completed.

In this way, the hinge shaft 9 is attached to the support frame 19.
Since the outer plate material 20A and the inner plate material 20B are supported in both positions, even if a load is applied from the container 3, deformation and bending stress are reduced, and a strong support form is obtained.

Next, loading and unloading of the container 3 will be explained. Second
When the cargo handling vehicle 1 shown in the figure is in a stopped state with the container 3 on board, the hydraulic jack 34 is extended and the outriggers 35 are extended from the rear of the support frame 19 and grounded. In order to unload the container 3, the hydraulic cylinder 11 of the front arm 13 is set in a free state,
When the hydraulic cylinder 8 of the lift arm 5 shown in FIG.
Rotate in the direction.

The container 3 is received by the support part 6 of the lift arm 5 via the support shaft 4, while the grip shaft 15 is held by the hook 15 at the top end of the front arm 13, and the vehicle body is held as shown by the imaginary line in FIG. It is unloaded on the ground in the rear. At that time, since a parallelogram is formed by the imaginary sides connecting the hinge shaft 9, the support shaft 12, the support part 6, and the clamping shaft 16,
The container 3 maintains a horizontal attitude, and the unloading operation is performed smoothly.

When loading the container 3 onto the vehicle body 7, the hydraulic cylinders 8 and 11 are contracted, the lift arm 5 and the front arm 13 are rotated forward, and the container 3 to be transported is loaded onto the vehicle body 7. When the lift arm 5 rotates back and forth around the hinge shaft 9, as described above, the left end 9a and the right end 9b of the hinge shaft 9 are supported at both positions of the outer plate material 20A and the inner plate material 20B, respectively. Compared to the case of cantilever support, loading and unloading can be carried out smoothly and in an extremely stable state.

As can be seen from the detailed explanation above, the hinge shaft, which is the center of rotation of the lift arm,
It is supported by a support frame on the side frame material that constitutes the vehicle frame, and the outer support ring attached to the outer panel material and the inner support ring attached to the inner panel material are also supported on both sides of each lift arm. It's summery.
Therefore, even if a large load of the container acts on the lift arm, support at both ends of the lift arm can be achieved. Unnecessary bending is less likely to be applied to the hinge shaft, and its durability is improved.

Furthermore, the lift arm can tilt within the support frame, and does not protrude sideways from the vehicle frame, thereby avoiding an increase in vehicle width due to attachment of the lift arm. Furthermore, the lift arm and the hinge shaft can be easily integrated with the connecting member via the holding member, and the hinge shaft can be easily attached and detached. The integration work will be carried out from the inside of the vehicle body to the outside, and the outer support ring that supports the hinge shaft will not be involved in any way in fastening the connecting members, so it will only be able to perform the bearing function. It can be kept as a small one. Therefore, there is no need for the outer support ring to be a member that protrudes significantly laterally, and this also does not cause an increase in the vehicle width.

Note that the hinge shaft mounting structure of the present invention can also be employed in a cargo handling device such as that shown in FIG. 10, in which the front arm 13 is not mounted.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a main part of the hinge shaft mounting structure of the present invention, Fig. 2 is an explanatory diagram of the configuration of a cargo handling device in a cargo handling vehicle to which the present invention is applied, and Fig. 3 is a view taken along the - line in Fig. 2. , FIG. 4 is a configuration diagram of the main parts of the cargo handling device, FIG. 5 is a view taken along the - line in FIG. 4, FIG. 6 is a sectional view taken along the - line in FIG. 8 and 9 are explanatory views of the installation of a hinge shaft, and FIG. 10 is an explanatory view of the configuration of an example of a cargo handling device in a cargo handling vehicle according to the prior art. FIG. 11 is a sectional view taken along the line XI--XI in FIG. 10, and FIG. 12 is a plan view of a vehicle body employing a conventional structure. 1...Cargo handling vehicle, 2...Cargo handling device, 3...Container, 5...Lift arm, 7...Car body, 8...
Hydraulic cylinder, 9... Hinge shaft, 18...
Vehicle frame, 18b...Side frame material, 19...Support frame body, 2
0A... Outer plate material, 20B... Inner plate material, 21... Holding member, 21a... Large opening (large diameter hole), 21b
...Small opening (small diameter hole), 23...Connecting member, 2
4... Outer support ring, 25... Inner support ring, 26A... Small support tube, 26B... Large support tube, 26d... Insertion hole, 27
... Inner ring material, 28 ... Outer ring material, 29 ... Wedge member,
M...Tapered surface.

Claims (1)

[Scope of Claims] 1. The left and right sides of the container are supported by a pair of lift arms provided on the left and right sides of the vehicle body, which are rotatable in the front and rear directions in synchrony around a hinge shaft extending in the left and right direction of the vehicle body, and hydraulic cylinders In cargo handling vehicles, containers on the ground at the rear of the vehicle can be loaded onto the vehicle by forward rotation of the lift arm, and containers on the vehicle can be unloaded onto the ground at the rear by rotation of the lift arm backwards. In the cargo handling device, the lower end of each of the lift arms has a stepped space having a small diameter hole through which the hinge shaft can be inserted and a large diameter hole that is connected to the small diameter hole and opens toward the inside of the vehicle body. A holding member provided therein is fixed, and a diameter is expanded through the tapered surface by displacing a wedge member in the left-right direction between the hinge shaft inserted through the holding member and the hole surface of the large diameter hole. A connecting member is provided, which includes an outer ring material that is pressed into contact with the large diameter hole and an inner ring member that is reduced in diameter and is brought into pressure contact with the hinge shaft, and is capable of integrating the lift arm and the hinge shaft via the holding member. A support frame body having an outer plate member and an inner plate member located inside and outside of each lift arm and extending in the front-rear direction is attached to the side frame member that is located below the lift arm and forms the vehicle frame of the loading platform, An outer support ring is attached to the outer plate member, and an outer support ring is attached to the inner plate member, and an outer support ring is attached to the inner plate member, and an inner support ring is attached to the inner plate member. A ring is attached to the inner support ring, and the inner support ring has a large support tube provided with an insertion hole through which a coupling member that has been inserted in advance into the hinge shaft can be moved into the holding member, and a large support tube that is fitted into the insertion hole and that is attached to the hinge shaft. A cargo handling device for a cargo handling vehicle, comprising a small support tube fixed to support a shaft, the hinge shaft being supported on both sides of each lift arm by the outer support ring and the inner support ring, respectively. hinge shaft mounting structure.