Container transport vehicle

Abstract

Providing a container transport vehicle that can suppress the lifting of the dump arm. [Solution] The system comprises a vehicle frame, a dump arm, a lift arm, a hook arm, an arm lock device for switching the luffing rotation of the lift arm between a restricted state and an unrestricted state, a float-stopping device for switching the floating of the dump arm between a float-restricted state and an unrestricted state, a coupling interlocking unit connected to interlock the arm lock device and the float-stopping device, and an operating device for operating one of the arm lock device, the float-stopping device, and the coupling interlocking unit in accordance with the movement of the hook arm relative to the lift arm. When any one of the above is operated by the operating device, the switching operation of the arm lock device and the float-stopping device is linked via the coupling interlocking unit, and the system is configured to switch between a loading / unloading state in which the arm lock device is in an unrestricted state and the float-stopping device is in a float-restricted state, and a dump state in which the arm lock device is in a restricted state and the float-stopping device is in a float-restricted state.

Description

Technical Field

[0001] The present invention relates to a container carrier capable of carrying a container.

Background Art

[0002] As such a container carrier, for example, as disclosed in FIGS. 6 and 7 of Patent Document 1, there are provided a vehicle body, a gantry whose rear end is supported by the rear end of the vehicle body so as to be able to rise and fall and rotate, and an L-shaped arm whose rear end is supported by the front end of the gantry so as to be rotatable about a second rotation axis, and a container handling vehicle provided with a hook portion for engaging a container on the L-shaped arm is known.

[0003] Further, in the container handling vehicle, an anti-collapse mechanism for fixing and holding both the gantry and the L-shaped arm integrally is provided at the connecting portion between the gantry and the L-shaped arm. When dumping the container, the anti-collapse mechanism is locked to integrally fix and hold the L-shaped arm and the gantry, and the container can be put into a dumped state by rotating them integrally. When the anti-collapse mechanism is released, the container is slid in the front-rear direction while only the L-shaped arm is rotated in a state where the L-shaped arm and the gantry are independent, so that the container can be attached to and detached from the vehicle body.

[0004] Further, the container handling vehicle is configured to be able to switch between a locked state and an unlocked state of the L-shaped arm with respect to the vehicle body. Specifically, locking portions are provided at both ends of the second rotation axis for rotatably supporting the second frame in a state of being locked to the support portion of the vehicle body when attaching and detaching the container, and releasing the locked state when dumping. The support portion consists of two fixed shafts protruding inward in the vehicle width direction from the left and right side walls of the vehicle body. The locking portion consists of a circular hole portion recessed in the end face of the second rotation axis so that the fixed shaft can be inserted, and an insertion groove formed by cutting out a portion of the side wall of the hole portion through which the fixed shaft can be inserted when the container is placed.

[0005] With this configuration, the container handling vehicle is said to be able to switch between a state in which the second frame is locked to the chassis and a state in which it is unlocked. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 3856702 [Overview of the project] [Problems that the invention aims to solve]

[0007] Thus, in the conventional container handling vehicle described above, when attaching or detaching a container, once the second rotating shaft rotates a certain amount along with the L-shaped arm, the position of the insertion groove relative to the axis moves from downward to forward, and the fixed shaft is locked in by the side wall of the locking hole, preventing it from coming out of the insertion groove. However, until the second rotating shaft rotates a certain amount, the insertion groove is in a downward position, and if the fixed shaft comes out of the insertion groove without being locked in, the L-shaped arm or gantry may lift up.

[0008] Therefore, in view of these circumstances, the present invention aims to provide a container transport vehicle that can suppress the lifting of the dump arm. [Means for solving the problem]

[0009] The container transport vehicle of the present invention is The vehicle body frame extends in the front-to-rear direction, A dump arm extending in the front-rear direction and having its rear end in the front-rear direction rotatably connected to the vehicle frame around an axis in the width direction of the vehicle, which rotates up and down relative to the vehicle frame, A lift arm is positioned in front of the dump arm, and its rear end in the front-rear direction is rotatably connected to the dump arm around the axis in the width direction, and the lift arm rotates up and down relative to the dump arm. A hook arm is connected to the lift arm so as to be movable in the front-rear direction and to which a container can be attached and detached, An arm locking device that can switch between a restricted state in which the luffing rotation of the lift arm relative to the dump arm is restricted and a release state in which the restriction is released, A floating prevention device that can switch between a floating restriction state in which the lifting of the dump arm due to the up-and-down rotation of the vehicle frame is restricted, and a floating restriction release state in which the restriction on the lifting is released, A connecting interlocking unit is provided, which is connected to the arm lock device and the float stop device, and which synchronizes the switching operation of the arm lock device and the float stop device. The system includes an operating device that activates one of the arm locking device, the float stopper, and the connecting interlocking part in response to the movement of the hook arm relative to the lift arm, The operating device activates one of the arm lock device, the float stopper device, and the connecting interlocking unit, thereby linking the switching operation of the arm lock device and the float stopper device via the connecting interlocking unit. This configuration switches between a loading / unloading state in which the arm lock device is in the release state and the float stopper device is in the float restriction state, and a dump state in which the arm lock device is in the restriction state and the float stopper device is in the release state.

[0010] In the container transport vehicle with the above configuration, the arm lock device and the anti-float device are configured to operate in conjunction via a connecting interlocking part. Therefore, when loading or unloading is performed, the arm lock device switches to the release state and the anti-float device switches to the float restriction state in conjunction, suppressing the lifting of the dump arm relative to the vehicle frame when loading or unloading containers.

[0011] Furthermore, in the container transport vehicle of the present invention, The aforementioned arm lock device is A locking shaft provided on the dump arm and extending in the width direction, A locking engagement portion is provided so as to be rotatable around the locking shaft, The lift arm is provided with a lock-engaged portion into which the lock-engaging portion can engage, The locking engagement portion is configured to be switchable between a restricted state in which it is engaged with the locked engagement portion by rotating around the locking shaft, and a released state in which it is released from engagement with the locked engagement portion. The aforementioned float-preventing device is A float stopper shaft is provided on the dump arm and extends in the width direction, A floating-stopping movable part is provided so as to be rotatable around the floating-stopping shaft, It comprises a fixing portion that is fixed to the vehicle body frame and into which the floating movable portion can make contact, The floating-restricting movable part rotates around the floating-restricting shaft, causing the dump arm to rotate to the upright side. The floating-restricting movable part is configured to be switchable between a floating-restricting state in which it is positioned to contact the floating-restricting fixed part, and a floating-restricting release state in which it is positioned not to contact the floating-restricting fixed part. The locking shaft and the anti-float shaft may be arranged coaxially.

[0012] By arranging the locking shaft and the anti-float shaft coaxially in this way, the interlocking mechanism between the arm locking device and the anti-float device can be simplified.

[0013] Furthermore, in the container transport vehicle of the present invention, The connecting interlocking portion may be provided between the arm lock device and the float-preventing device and comprises a connecting body portion that connects one of the lock shaft and the lock engagement portion with one of the float-preventing shaft and the float-preventing movable portion.

[0014] In this way, the space between the arm lock device and the float stopper device can be utilized to link the two devices together. [Effects of the Invention]

[0015] As described above, the container transport vehicle of the present invention can achieve the excellent effect of suppressing the lifting of the dump arm. [Brief explanation of the drawing]

[0016] [Figure 1] This is an overall side view of the container carrier of the present invention equipped with a container. [Figure 2] This is an overall side view of the container carrier with the hook arm tilted backward to move the container backward. [Figure 3] This is an overall side view of the container carrier showing the state immediately before lowering the container by rotating the lift arm. [Figure 4] This is an overall side view of the container carrier showing the state where the container has been lowered to the ground by rotating the lift arm. [Figure 5] This is a plan view of the lift arm and the dump arm as seen from above. [Figure 6] This is a side view of the hook arm and the lift arm as seen from the side with the arm lock device switched to the restricted state. [Figure 7] This is a perspective view of the arm lock device in the state of being switched to the restricted state as seen from the front side. [Figure 8] This is a perspective view of the arm lock device in the state of being switched to the restricted state as seen from the rear side. [Figure 9] This is an explanatory view of the floating stop device in the state of being switched to the floating restriction release state. [Figure 10] This is a side view of the arm lock device in the state of being switched to the restricted state. [Figure 11] This is a side view showing the state where the hook arm is tilted backward at a predetermined angle smaller than the maximum angle to unlock the lock device. [Figure 12] This is a side view of the arm lock device at the time when the restricted state starts to be released. [Figure 13] This is a side view of the main part of the arm lock device in FIG. 11. [Figure 14] This is a perspective view of the arm lock device in the unrestricted state as seen from the rear side. [Figure 15] This is an explanatory view of the floating stop device in the state of being switched to the floating restriction state. [Figure 16]This is a side view showing the state in which the hook arm has been tilted to its maximum rearward angle, switching the arm lock device to the release state. [Figure 17] Figure 16 is a side view of the main part of the arm lock device. [Figure 18] This is a side view showing the lift arm in the process of changing its position from an upright position to a reclined position. [Figure 19] This is an enlarged view of the main part shown in Figure 18. [Figure 20] This is a side view showing the state in which the lift arm has been changed from an upright position to a reclined position with the arm lock device switched to the release position. [Figure 21] This is a side view of the main part in Figure 20. [Figure 22] Another embodiment is shown in which the lift arm and the operating device are connected via a link, and this is a side view of the hook arm and the lift arm with the arm locking device switched to the release position. [Figure 23] Figure 22 is a side view of the hook arm and lift arm when the arm locking device is switched to the restricted state. [Figure 24] Figure 23 shows a cross-sectional view along the line XXIV-XXIV. [Figure 25] Figure 23 is a side view of the main part showing the shape of the operating section. [Figure 26] Figure 22 is a side view showing the state in which the arm lock device shown is in the unlocked state, and the operating part, which is located in front of the lift arm, is moved to the rear due to an operational error or the like before the lift arm lands, before the lift arm lands. [Figure 27] This is a side view of a container transport truck with the container tilted backward. [Modes for carrying out the invention]

[0017] The following describes a container transport vehicle according to one embodiment of the present invention. As shown in Figure 1, the container transport vehicle V has a driver's cab Ca mounted in front of a pair of left and right chassis frames F,F (only the left side is shown in Figure 1), and a pair of left and right subframes (also called cargo handling frames) 1,1 (only the left side is shown in Figure 1) mounted behind the chassis frames F,F, and these chassis frames F,F and subframes 1,1 constitute the vehicle body frame. As shown in Figure 5, the subframes 1,1 consist of long longitudinal frames in the front-rear direction, and these longitudinal frames are connected to each other by transverse frames 1B that extend in the left-right direction. Containers Ct are loaded on these subframes 1,1. A jacking device D is provided at the rear of the chassis frames F,F. This jacking device D changes the orientation to a vertical position shown by the dashed line by manually rotating the jack part d, which is located diagonally forward, around the horizontal axis when loading or unloading containers Ct. This allows the container transport vehicle V to be stabilized on the ground GR so that the front wheels do not lift off the ground too much during operation.

[0018] As shown in Figures 1 to 5, a pair of left and right guide rollers 2,2 (only the left side is shown in Figures 1 to 4) are rotatably mounted on the rear end of the subframes 1,1, projecting outward in the left and right directions. These guide rollers 2,2 rotate to guide the movement of the container Ct when lowering it from the subframe 1 to the ground, or when loading the container Ct from the ground onto the subframe 1.

[0019] As shown in Figure 5, the rear ends of a pair of left and right dump arms 3,3 are rotatably supported at the rear ends of the subframes 1,1, and the dump arms 3,3 are configured to tilt around the left and right horizontal axes 3T,3T. The dump arms 3,3 consist of long vertical frames in the front-rear direction, and are equipped with intermediate horizontal frames 3B that connect the intermediate parts of these vertical frames in the left-right direction, and front horizontal frames 3C that connect the front ends of the vertical frames. A support shaft 3D passes through the front side of the intermediate part of the vertical frame, and the rear end of the lift arm 4 is integrally and rotatably attached to this support shaft 3D. This lift arm 4 is located between the dump arms 3,3, and its rear end overlaps the front end of the dump arms 3,3 in the front-rear direction. In addition, the intermediate part of the lift arm 4 and the front ends of the subframes 1,1 are connected by a pair of hydraulic lift cylinders 5,5. By extending and retracting these lift cylinders 5,5, the lift arm 4 can be rotated around the support shaft 3D.

[0020] As shown in Figure 6, the base end of a roughly L-shaped hook arm 6 is rotatably attached to the front end of the lift arm 4 around a horizontal axis 7 in the left-right direction, and the hook arm 6 is configured to tilt in a direction (rearward) toward the support axis 3D, which is the rotation center of the lift arm 4, where the hook 8 (described later) will be located. The upper end of the hook arm 6 is equipped with a roughly C-shaped hook 8 that can engage with and disengage from the engagement portion 12 of the container Ct (described later). A hydraulic hook cylinder 9 is connected between the middle part of the hook arm 6 and the front end of the lift arm 4, and by extending and retracting this hook cylinder 9, the hook arm 6 can be changed from the traveling posture (vertical posture) shown in Figures 1 and 6 to a non-traveling posture (hereinafter referred to as the first posture) in which the hook 8 is tilted by a predetermined angle (an angle smaller than the maximum angle) toward the rotation center of the lift arm 4, as shown by the solid line in Figure 11. Furthermore, by extending the hook cylinder 9 to its maximum extent, the hook arm 6 can be changed from the traveling position shown in Figures 1 and 6 to a non-traveling position (hereinafter referred to as the second position) in which the hook 8 is tilted at its maximum angle in the direction approaching the rotation center of the lift arm 4, as shown by the dashed line in Figure 11 and the solid line in Figure 16.

[0021] Container Ct is configured as an open-top box shape, equipped with multiple support legs 10 (one pair on each side) on its front underside and multiple running wheels 11 (one pair on each side) on its rear underside. The front of container Ct is equipped with an engaging portion 12 that can engage with the hook 8 of the hook arm 6, which will be described later, and the rear of container Ct is equipped with a retractable rear gate 13.

[0022] As shown in Figures 6 and 7, the lower surface of the lift arm 4 is equipped with an arm lock device 14 that can be switched between a restricted state, which locks the luffing rotation of the lift arm 4 relative to the dump arm 3 in order to dump the container Ct with the dump arm 3, and an unlocked state, which unlocks the luffing rotation of the lift arm 4 relative to the dump arm 3 in order to load or unload the container Ct with the hook arm 6 or load the container Ct.

[0023] The arm lock device 14 includes a lock shaft X1 provided on the dump arm 3 and extending in the width direction (left-right direction) of the container transport vehicle V, left and right lock engagement parts 17, 18 which are mounted so as to be rotatable around the horizontal axis X, which is the axis of the lock shaft X1, while being sandwiched between two sets of brackets 15, 15, 16, 16 which are attached so as to extend forward from the front end horizontal frame 3C of the dump arm 3, left and right pin-shaped lock engagement parts 19, 20 (see Figure 7) which protrude outward in the left-right direction on both sides of the rear end of the lift arm 4, and an interlocking part 21 for locking or unlocking the lock engagement parts 17, 18 to the lock engagement parts 19, 20. In Figure 7, the lift arm 4 is omitted. The lock engagement parts 19, 20 are mounted on the lift arm 4 at a position forward of the support axis 3D. The left and right locking engagement parts 17 and 18 rotate around the horizontal axis X, causing them to stand upright towards the rear (see Figures 7 and 10), thereby locking the locking engagement parts 17 and 18 into the locked engagement parts 19 and 20. Conversely, the left and right locking engagement parts 17 and 18 rotate around the horizontal axis X, causing them to fold forward (see Figures 13 and 17), thereby releasing the locking of the locking engagement parts 17 and 18 from the locked engagement parts 19 and 20.

[0024] The locking engagement parts 17 and 18 are composed of members that are roughly L-shaped in side view, with locking notches 17K and 18K formed therein that engage with the locking engagement parts 19 and 20. This creates an open opening at the rear and a closed section at the front. The locking engagement parts 17 and 18 are connected in the left-right direction by a rod-shaped rod 22. By engaging or disengaging the interlocking part 21 with this rod 22, the left and right locking engagement parts 17 and 18 can be switched between a locked state, where they are engaged with the left and right locking engagement parts 19 and 20, and an unlocked state, where they are released.

[0025] The interlocking unit 21 includes a hook arm rod 23 whose front end is interlocked with the hook arm 6 so as to move in the front-rear direction in accordance with the change in posture of the hook arm 6, and an operating unit 24 connected to the rear end of the hook arm rod 23 for rotating the lock engagement units 17 and 18. Therefore, when the hook arm 6 changes posture from a running posture to a non-running posture, the interlocking unit 21 moves forward, and when the hook arm 6 changes posture from a non-running posture to a running posture, the interlocking unit 21 moves backward. The hook arm rod 23 and the operating unit 24 are made of metal, but they can be made of other materials as long as they have approximately the same strength as metal.

[0026] The hook arm rod 23 is supported on the underside of the lift arm 4 by a plurality of support parts 25 (two spaced apart in the front-rear direction in Figure 6) so as to be movable in the front-rear direction. The front end of the hook arm rod 23 is connected to the rear end of a plate-shaped second mounting member 27, which is attached to the lower end of a plate-shaped first mounting member 26, the upper end of which is attached to the lower end of the hook arm 6, so as to extend rearward.

[0027] As shown in Figure 19, the operating section 24 includes a base end 24A with a nut portion that is screwed into the rear end of the hook arm rod 23, a tip end 24B located one level above the upper end of the base end 24A and extending rearward, and consisting of a triangular frame portion in side view, a contact portion 24C (see Figure 13) formed between the base end 24A and the tip end 24B and extending diagonally downward and rearward, and having a contact surface 24c that contacts the rod (contact portion) 22 from the front, and an inverted U-shaped guide groove portion 24M (see Figure 10) formed between the contact portion 24C and the tip end 24B to guide the rod 22, which contacts the contact surface 24c as the hook arm rod 23 moves rearward and moves diagonally upward and forward. Figure 13 shows the state just before the contact surface 24c of the contact portion 24C contacts the rod 22, and Figure 10 shows the state after the contact surface 24c of the contact portion 24C contacts the rod 22 and the rod 22 has moved to the upper end of the guide groove portion 24M. An inclined surface 24K is formed on the rear surface of the tip portion 24B, which is angled downward and forward. As the hook arm rod 23 moves forward, it contacts the rod 22 located at the upper end of the guide groove portion 24M from behind, causing the rod 22 to move downward along the inclined surface 24K. Thus, the tip portion 24B functions as a release portion that releases the locking from the rod 22. In this way, the container transport vehicle V of this embodiment is configured with an operating device that operates the arm lock device 14 in accordance with the movement of the hook arm 6 relative to the lift arm 4 by the interlocking portion 21.

[0028] When the lift arm 4 is placed on the subframe 1 and the lift arm 4 is brought to the ground, the left and right locking engagement parts 17 and 18 of the rod (contact portion) 22 are in a disengaged state and are located within the range of movement of the contact surface 24c of the contact portion 24C. Furthermore, when the lift arm 4 is rotated to the rear, the left and right locking engagement parts 17 and 18 of the rod (contact portion) 22 are in a disengaged state and are located outside the range of movement of the contact surface 24c of the contact portion 24C. Therefore, when the lift arm 4 is rotated to the rear, the contact portion 24C of the operating part 24 does not come into contact with the rod (contact portion) 22, and the left and right locking engagement parts 17 and 18 and the hook arm 6 do not move in conjunction. As a result, the lift arm 4 can be brought to the ground with the left and right locking engagement parts 17 and 18 in a disengaged state, thus preventing interference between the locked engagement parts 19 and 20 and the left and right locking engagement parts 17 and 18.

[0029] As shown in Figures 8 and 14, the container transport vehicle V is equipped with a float-preventing device 39 that can be switched between a float-preventing state in which the lifting of the dump arms 3,3 due to the luffing rotation (rotation toward the upright side) of the vehicle frame (subframes 1,1) is restricted, and a float-preventing release state in which the restriction on lifting is released, and a coupling interlocking unit 40 that is connected to the arm lock device 14 and the float-preventing device 39 and that links the switching operations of the arm lock device 14 and the float-preventing device 39.

[0030] The arm lock device 14, the float stopper device 39, and the connecting interlocking unit 40 are configured such that when any one of them moves, they all move together as a single unit.

[0031] In the container transport vehicle V of this embodiment, the arm lock device 14 is moved by the interlocking unit 21 in conjunction with the movement of the hook arm 6. Therefore, the anti-float device 39 is configured to be interlocked with the movement of the arm lock device 14, which has been operated by the interlocking unit 21, via the connecting interlocking unit 40.

[0032] As a result, in this embodiment, the container transport vehicle V is configured such that the switching of the arm lock device 14 from a restricted state to a released state and the switching of the anti-float device 39 from a released floating state to a restricted floating state are performed simultaneously, and the switching of the arm lock device 14 from a released state to a restricted state and the switching of the anti-float device 39 from a restricted floating state to a released floating state are performed simultaneously.

[0033] The anti-float device 39 of this embodiment includes an anti-float fixing portion 390 fixed to the subframe 3, and an anti-float engaging portion 391 configured to switch between a state in which the anti-float fixing portion 390 can contact (specifically engage) only in the up direction, which is the same direction as the rotation direction of the dump arms 3, 3, and a state in which it cannot contact (specifically engage) the anti-float fixing portion 390, as the arm lock device 14 switches between a restricted state and an unrestricted state.

[0034] The anti-float fixing portion 390 is provided on the inner bracket 390A which extends inward in the width direction from the subframe 1. Specifically, the anti-float fixing portion 390 is provided on the lower surface of the inner bracket 390A and extends downward from the lower surface.

[0035] Furthermore, a reinforcing rib 390B is connected to the anti-float fixing portion 390, extending from the lower surface of the inner bracket 390A and extending inward in the width direction from the subframe 1. This reinforcing rib 390B is formed between the anti-float fixing portion 390 and the subframe 1. Thus, the anti-float fixing portion 390 is also connected to the subframe 1 by the reinforcing rib 390B.

[0036] The anti-float engagement portion 391 includes an anti-float bracket 3910 fixed to the front end lateral frame 3C, an anti-float shaft 3911 arranged coaxially with the lock shaft X1 and rotatably held by the anti-float bracket 3910, and an anti-float movable portion 3912 fixed to the anti-float shaft 3911 and rotating together with the anti-float shaft 3911.

[0037] The anti-float shaft 3911, which extends in the width direction, is connected to one of the locking engagement parts 18 by a connecting interlocking part 40. Therefore, when the locking engagement part 18 rotates, the anti-float shaft 3911 also rotates in conjunction with the locking engagement part 18. Furthermore, the anti-float shaft 3911 is positioned below the anti-float fixing part 390 in the height direction.

[0038] The floating-stopping movable part 3912 has a fixed end portion 3913 fixed to the floating-stopping shaft 3911, and a fixed extension portion 3914 extending radially outward from the fixed end portion 3913 toward the floating-stopping shaft 3911.

[0039] Since the tip of the fixed extension 3914 is positioned radially outward from the anti-float shaft 3911 than the outer peripheral edge of the fixed end 3913, when the anti-float movable part 3912 rotates, the fixed extension 3914 rotates around the anti-float shaft 3911 at a position radially outward from the anti-float shaft 3911.

[0040] Furthermore, the fixed extension portion 3914 is configured to change its position between being aligned below (directly below) the anti-float fixing portion 390 in the height direction and being retracted from below the anti-float fixing portion 390 in the height direction (retracted from directly below to the rearward side) as it rotates around the anti-float shaft 3911 (see Figures 9 and 15).

[0041] When the dump arm 3 lifts up, the fixed extension 3914 moves upward in the height direction. Therefore, if the fixed extension 3914 is positioned below the anti-float fixing part 390 in the height direction, the lifting of the dump arm 3 is restricted by the fixed extension 3914 contacting the anti-float fixing part 390 from below (see Figure 15).

[0042] On the other hand, if the fixed extension portion 3914 is positioned in a height-direction recessed from below the anti-float fixing portion 390, the anti-float engaging portion 391 passes behind the anti-float fixing portion 390 and moves from below upward, so that the fixed extension portion 3914 does not come into contact with the anti-float fixing portion 390, and the dump arm 3 can be raised (see Figure 8).

[0043] The connecting interlocking section 40 has a connecting body consisting of an arm-side connecting section 400 which is connected to the locking engagement section 18, which is located closer to the float-stopping device 39, and a float-stopping side connecting section 401 which is connected to the arm-side connecting section 400 and the float-stopping shaft 3911.

[0044] The arm-side connecting portion 400 has a connecting extension portion 4000 that extends outward in the vehicle width direction from the locking engagement portion, and a connecting pin 4001 that is fixed to the connecting extension portion 4000 and extends outward in the vehicle width direction from the connecting extension portion 4000.

[0045] The connecting pin 4001 is positioned away from the locking shaft X1 and moves around the locking shaft X1 as the locking shaft X1 rotates.

[0046] The float-stopping connecting portion 401 includes a float-stopping plate 4010 that is rotatably connected to the arm-side connecting portion 400, and a float-stopping fixing means 4011 that fixes the float-stopping plate 4010 to the float-stopping shaft 3911.

[0047] The float-stopping plate 4010 has a plate fixing portion 4012 that is fixed to the float-stopping shaft 3911, and a plate extension portion 4013 that extends upward from the plate fixing portion 4012 in a radially outward direction (corresponding to the radially outward direction of the float-stopping shaft 3911).

[0048] The tip of the connecting pin 4001 is inserted through the plate extension 4013, and the plate extension 4013 and the connecting pin 4001 are in a state where they can rotate relative to each other.

[0049] The anti-float fixing means 4011 is composed of two pins. The anti-float plate 4010 is attached to the anti-float shaft 3911 by the anti-float fixing means 4011 so that it cannot rotate relative to it.

[0050] Therefore, as the locking engagement portion 18 rotates, the float-stopping connecting portion 401 moves, causing the float-stopping plate 4010 to rotate around the float-stopping shaft 3911. The float-stopping shaft 3911 also rotates in conjunction with the movement of the float-stopping plate 4010.

[0051] Next, we will explain the operation of lowering container Ct from subframe 1 of container transport vehicle V to the ground.

[0052] As shown in Figure 1, the container transport vehicle V is in a drivable state with the container Ct mounted on the subframes 1,1. The hook cylinder 9 is then extended. This causes the hook arm 6 to tilt (change its posture) to the rear, changing its posture to a second posture (see Figure 2). As a result of this posture change, as shown in Figures 16 and 17, the hook arm rod 23 is pulled, causing the inclined surface 24K to contact the rod 22, which was locked at the upper end of the guide groove 24M, as shown in Figures 7 and 10. The rod 22 is then pushed downward along the inclined surface 24K. When the rod 22 reaches the lower end of the inclined surface 24K, it descends by its own weight to a position where it is released from the lower end of the inclined surface 24K, and the operating part 24 moves further forward.

[0053] As a result, the locking engagement parts 17 and 18, which were engaged with the locking engagement parts 19 and 20, are released, and the arm lock device 14 enters a release state. In addition, the coupling interlocking part 40 and the float prevention device 39 also rotate in conjunction with the rotation of the locking engagement part 18, and the fixed extension part 3914 of the float prevention device 39 moves from a position where it is retracted from below the float prevention fixing part 390 to a position where it is aligned below the float prevention fixing part 390 (see Figures 14 and 15). As a result, the dump arm 3 enters a float-restricted state where it is prevented from floating relative to the subframes 1 and 1.

[0054] At this point, container Ct is in a position rearward relative to the container transport vehicle V. When the arm lock device 14 is unlocked, the operation of the hook cylinder 9 is stopped, and the extension operation of the lift cylinder 5 is started, rotating the lift arm 4 to lift container Ct and move it rearward (see Figure 3). Furthermore, while the lift cylinder 5 is extended, container Ct is lowered to the ground, and the lowering operation of container Ct is completed (see Figure 4). At this point, since the fixed extension part 3914 is positioned below the anti-float fixing part 390, even if the dump arm 3 tries to rise, the fixed extension part 3914 comes into contact with the anti-float fixing part 390, restricting the rotation of the dump arm 3 in the direction of rising (the floating of the dump arm 3 is restricted). Furthermore, the lowered position of the rod 22 is restricted to a position where the contact surface 24c of the operating part 24 contacts the rod 22 when the operating part 24, which has moved to the unlocked position as the hook arm 6 changes its posture from the second posture to the driving posture, moves backward.

[0055] Conversely, the loading operation when placing a container Ct that has been lowered to the ground onto the subframe 1 will now be explained. The lifting of the container Ct is started with the same angle of the hook arm 6 and lift arm 4 as in the state shown in Figure 4 during loading and unloading. That is, the lift cylinder 5 is shortened to rotate the lift arm 4 forward to the state shown in Figure 3, and then the lift arm 4 is rotated further forward to show the state in which the lift arm 4 is placed on the subframe 1 as shown in Figure 2. From this state, the hook cylinder 9 is shortened to move the hook arm rod 23 backward, so that it comes into contact with the contact surface 24c of the contact portion 24C from the state shown in Figure 12, and by pushing the rod 22, the rod 22 moves to the upper end of the guide groove portion 24M. As a result of this movement, the lock engagement portion 17 rotates around the horizontal axis X and takes an upright position, engaging with the lock engagement portion 19, and the arm lock device 14 enters a locked state (see Figures 6 to 10). Figure 1 shows the hook arm 6 in the position where it can be driven (ready to drive).

[0056] As described above, when locking the arm lock device 14 by engaging the lock engagement parts 17 and 18 with the lock engagement parts 19 and 20, the hook arm 6 is changed from a non-traveling position close to the rotation center of the lift arm 4 to a traveling position. This causes the interlocking part 21 to move to the rear, and the contact surface 24c of the operating part 24 of the interlocking part 21 comes into contact with the rods 22 of the lock engagement parts 17 and 18. By pushing the rods 22 of the lock engagement parts 17 and 18, the position is changed from a reclined position to an upright position, and the lock engagement parts 17 and 18 are engaged with the lock engagement parts 19 and 20. Furthermore, when releasing the locking engagement parts 17 and 18 that are engaged with the locking engagement parts 19 and 20 to unlock the arm lock device 14, the hook arm 6 is changed from a traveling position to a non-traveling position closer to the rotation center of the lift arm 4. This causes the interlocking part 21 to move forward, and the inclined surface 24K of the operating part 24 of the interlocking part 21 comes into contact with the rods 22 of the locking engagement parts 17 and 18. This moves (pulls) the rods 22 forward, changing the position from an upright position to a reclined position and releasing the locking engagement parts 17 and 18 that are engaged with the locking engagement parts 19 and 20. In this way, as the interlocking part 21 moves in the front-rear direction in conjunction with the change in the posture of the hook arm 6, the locking engagement parts 17 and 18 are rotated in a predetermined direction to engage with the locked engagement parts 19 and 20, or the locking engagement parts 17 and 18 that are engaged with the locked engagement parts 19 and 20 are rotated in the opposite direction to the predetermined direction to release the engagement, thus eliminating the need for actuators to rotate the locking engagement parts 17 and 18.

[0057] Furthermore, when loading container Ct, the hook arm 6 is changed from a traveling position to a non-traveling position closer to the rotation center of the lift arm 4. This causes the lock engagement parts 17 and 18 to move (pull) using the operating part 24 of the interlocking unit 21, resulting in a state where the lock engagement parts 17 and 18 are released from the locked engagement parts 19 and 20. In other words, both the operating part 24 of the interlocking unit 21 and the lock engagement parts 17 and 18 move forward. Loading container Ct in this state (see Figures 18 and 19) prevents problems such as interference between the operating part 24 of the interlocking unit 21 and the rods 22 of the lock engagement parts 17 and 18. However, if, as described above, the hook arm 6 is changed from a non-traveling position to a traveling position due to an operational error before the lift arm 4 is lowered, the operating part 24 of the interlocking unit 21 will move backward to return the lock engagement parts 17 and 18 to an upright position. In this state, when a container Ct is loaded and the lift arm 4 moves from an upright position to a lowered position, the operating part 24 of the interlocking part 21, which is moving to the rear, interferes with the rods 22 of the locking engagement parts 17 and 18, which are located at the front. For this reason, the operating part 24 of the interlocking part 21 is provided with a relief part 24N to create a space 24H so that it does not interfere with the rods 22 of the locking engagement parts 17 and 18.

[0058] As shown in Figures 19 to 21, the relief portion 24N is formed on the front surface opposite to the contact surface 24c of the contact portion 24C of the operating portion 24 as an inclined surface that extends diagonally upward and forward, and a space 24H is formed that is released diagonally downward from this inclined surface. Therefore, by providing the space 24H formed by the relief portion 24N, when the lock engagement portions 17 and 18 are in the unlocked state and the hook arm 6 has changed from a non-traveling position to a traveling position, when the lift arm 4 goes from an upright position to a reclined position, as shown in Figure 21, the rods 22 of the left and right lock engagement portions 17 and 18 are positioned in the space 24H, so that the interlocking portion 21 does not interfere with the rods 22 of the lock engagement portions 17 and 18.

[0059] Furthermore, as shown in Figure 6, the system includes a first sensor 28 for detecting the lift arm 4 in a reclined position with the lift arm 4 resting on the chassis, a second sensor 29 for detecting the hook arm 6 in a driving position, a third sensor 30 for detecting the lock engagement portion 17 in a reclined position, and a control device 31 to which the detection or non-detection state of the three sensors 28, 29, and 30 is input.

[0060] The first sensor 28 is a photoelectric sensor comprising an irradiating unit that emits light and a light receiving unit that receives the light reflected back from the lift arm 4 after being emitted from the irradiating unit. Therefore, when the lift arm 4 is in a lowered position, the first sensor 28 enters a detection state by receiving the light reflected back from the lift arm 4 after being emitted from the irradiating unit, thereby detecting that the lift arm 4 is in a lowered position. Conversely, when the lift arm 4 rotates from a lowered position to an upright position, the first sensor 28 can no longer receive the light emitted from the irradiating unit, and therefore enters a non-detection state, detecting that the lift arm 4 is not in a lowered position.

[0061] The second sensor 29 consists of a tilt sensor that detects the tilt angle of the hook arm 6. Therefore, when the second sensor 29 detects that the hook arm 6 is tilted to an angle greater than a preset angle, it enters a non-detection state, detecting that the hook arm 6 is not in a driving position. Conversely, when the second sensor 29 detects that the hook arm 6 is tilted to an angle less than a preset angle, it enters a detection state, detecting that the hook arm 6 is in a driving position.

[0062] The third sensor 30 consists of a photoelectric proximity switch. When the lock engagement portion 17 is in an upright position, the proximity dog ​​30A attached to the lock engagement portion 17 approaches the proximity switch, resulting in a non-detection state where the lock engagement portion 17 is in an upright position (see Figure 10). When the lock engagement portion 17 is in a reclined position, the proximity dog ​​30A moves away from the proximity switch, resulting in a detection state where the lock engagement portion 17 is in a reclined position (see Figure 17). Furthermore, in the container transport vehicle V of this embodiment, when the lock engagement portion 17 is in an intermediate position between the upright and reclined positions, the locked engagement portion 19 is located within the locking notch 17K of the lock engagement portion 17 (specifically, between the closed portion and the opening of the locking notch 17K), and the lock engagement portion 17 is engaged with the locked engagement portion 19. In this state, the proximity dog ​​30A moves away from the proximity switch, and the lock engagement portion 17 enters a detection state where it is detected that it is in a reclined position (see Figure 12). At this time, the fixed end portion 3913 is positioned so that it does not come into contact with the lower part of the anti-float fixing portion 390, just behind it (see Figures 8 and 9).

[0063] Then, when the locking engagement portion 19 exits the opening of the locking notch 17K and the locking engagement portion 17 and the locking engagement portion 19 are released (see Figure 13), the fixed end portion 3913 is positioned directly below the float-preventing fixing portion 390, and the fixed end portion 3913 is positioned in contact with the float-preventing fixing portion 390.

[0064] In other words, the arm lock device 14 and the float stop device 39 are linked by the connecting interlocking unit 40 so that when the arm lock device 14 switches from a restricted state to a released state, the float stop device 39 switches from a float restricted state to a float stop release state at the same time.

[0065] The control device 31 includes a prohibition means 32 that prohibits changing the posture of the hook arm 6 from a traveling posture to a posture approaching the rotation center of the lift arm 4 when all three sensors 28, 29, and 30 are in a detection state.

[0066] Therefore, when loading container Ct is complete, if the lift arm 4 is detected to be in a lowered position, the hook arm 6 is detected to be in a traveling position, and the lock engagement parts 17 and 18 are detected to be in a lowered position, that is, if all three sensors 28, 29, and 30 are in a detection state, as described above, the space 24H formed by the relief portion 24N of the operating portion 24 of the interlocking unit 21 prevents interference with the lock engagement parts 17 and 18. However, if the hook arm 6 is accidentally changed from a traveling position to a non-traveling position closer to the rotation center of the lift arm 4 in this state, the operating portion 24 of the interlocking unit 21 will interfere with the rods 22 of the lock engagement parts 17 and 18. For this reason, when all three sensors 28, 29, and 30 are in a detection state, the control device 31 prevents the hook arm 6 from changing its position from a traveling position to a position closer to the rotation center of the lift arm 4, thereby suppressing the interference.

[0067] Furthermore, the control device 31 is configured to release the prohibition by the prohibition means 32 when the first sensor 28 for detecting the lift arm is in a non-detection state.

[0068] As described above, when the prohibition means 32 prevents the hook arm 6 from changing its posture from the traveling posture to the non-traveling posture that is closer to the rotation center of the lift arm 4, the lowered lift arm 4 is rotated back to the upright posture before the hook arm 6 changes its posture from the traveling posture to the non-traveling posture. This posture change results in a non-detection state where the second sensor 29 for detecting the hook arm does not detect that the hook arm 6 is in the traveling posture. In this non-detection state, when the lift arm 4 is raised or lowered, the operating unit 24 of the interlocking unit 21 can reliably switch the locking device 14 to the locked state without interfering with the locking units 17 and 18.

[0069] Figures 1 to 4 illustrate the case where the container Ct is lowered to the ground GR or the container Ct is loaded onto the ground GR by setting the arm lock device 14 to the release state and the float-restricting device 39 to the float-restricting state, and then rotating the lift arm 4 without rotating the dump arms 3,3. However, the container transport vehicle V can also tilt the container Ct to the rearward side in the front-rear direction (so-called dumping) or return it to its original position after tilting it to the rearward side by setting the arm lock device 14 to the restricting state and the float-restricting device 39 to the float-restricting state and then rotating the dump arms 3,3 and the lift arm 4 together.

[0070] When dumping container Ct, as shown in Figure 1, the lift cylinder 5 is extended without extending the hook cylinder 9 from the drivable state in which container Ct is mounted on the subframes 1,1 of the container transport vehicle V. If the arm lock device 14 is switched to the restricted state, the lift arm 4 will not be able to rotate relative to the dump arms 3,3.

[0071] Furthermore, when the anti-float device 39 is switched to the release state (dump state), the fixed extension portion 3914 is positioned in a retracted position below the anti-float fixing portion 390 (retracted from directly below to the rear). Therefore, when the dump arms 3,3 rotate in the direction of rising relative to the subframes 1,1, the anti-float engaging portion 391 can pass behind the anti-float fixing portion 390 and move from below to above, so that the fixed extension portion 3914 does not come into contact with the anti-float fixing portion 390, and the dump arms 3,3 continue to rotate in the direction of rising relative to the subframes 1,1.

[0072] Therefore, as the lift cylinder 5 continues to extend, the lift arm 4 and dump arms 3,3 rotate around the dump shaft 4D, causing the container Ct to tilt to the rear. Then, by opening the rear gate 13, the contents inside the container Ct can be dropped and discharged downwards.

[0073] To return the container Ct, which has been tilted backward, to its original position, simply retract the lift cylinder 5.

[0074] As described above, in the container transport vehicle V of this embodiment, the arm lock device 14 and the anti-float device 39 are configured to operate in conjunction via the connecting interlocking part 40. Therefore, when loading or unloading is performed, the arm lock device 14 releases the restriction on the rotation of the lift arm 4 relative to the dump arms 3,3, and the anti-float device 39 restricts the rotation of the dump arms 3,3 relative to the subframe 1. This works in conjunction to suppress the lifting of the dump arms 3,3 relative to the subframe 1 when loading or unloading containers Ct.

[0075] Furthermore, by arranging the lock shaft X1 and the anti-float shaft 3911 coaxially, the interlocking mechanism between the arm lock device 14 and the anti-float device 39 can be simplified.

[0076] Furthermore, in the coupling interlocking section 40, the coupling body is provided between the arm lock device 14 and the float-stopping device 39, and is configured to connect the lock engagement section 18 and the float-stopping shaft 3911. Therefore, the space between the arm lock device 14 and the float-stopping device 39 can be utilized to interlock the two devices.

[0077] Furthermore, in the connecting interlocking section 40, the lock shaft X1 and the anti-float shaft 3911 are separate components, which improves the convenience of centering the arm lock device 14 and the anti-float device 39.

[0078] The present invention can be modified in various ways without departing from its spirit. Furthermore, the specific configuration of each part is not limited to the embodiments described above.

[0079] In the above embodiment, the rearward change of the hook arm 6 was shown to be performed by tilting the hook arm 6 to the rear from the driving position, but it may also be performed by sliding the hook arm 6 to the rear from the driving position.

[0080] Furthermore, in the above embodiment, when the lift arm 4 is lowered in the travel position of the hook arm 6, a space 24H formed by a relief portion 24N is provided on the operating portion 24 of the interlocking portion 21 so that the operating portion 24 of the interlocking portion 21 does not interfere with the rods 22 of the lock engagement portions 17 and 18 in the lowered position. However, it is also possible to configure the interlocking portion 21 so that the operating portion 24 of the interlocking portion 21 interferes with (comes into) the rods 22 of the lock engagement portions 17 and 18 without providing a relief portion. In this case, when the operating portion 24 of the interlocking portion 21 interferes with (comes into) the rods 22 of the lock engagement portions 17 and 18, it is also possible to configure the interlocking portion 21 so that either one (the interlocking portion 21 or the lock engagement portions 17 and 18) moves away in the vertical direction.

[0081] Furthermore, in the above embodiment, the operating part 24 is provided with a tip portion 24B which is a release portion for releasing the lock from the rod 22, but the tip portion 24B may be omitted. In this case, the lock engagement portions 17 and 18 may be biased to a reclined position by their own weight or a spring (biasing means), and after the lock engagement portions 17 and 18 are locked to the lock engagement portions 19 and 20 by contacting the contact portion 24C of the operating part 24 and pushing the rod 22, the contact portion 24C of the operating part 24 may be moved forward (separated) from the rod 22 to change the position of the lock engagement portions 17 and 18 to a reclined position by their own weight or a spring (biasing means).

[0082] Furthermore, in the above embodiment, the control device 31 prohibited the change in posture of the hook arm 6 from the traveling posture to a posture approaching the rotation center of the lift arm 4 when all three sensors 28, 29, and 30 were in a detection state. However, it is also possible to prohibit the change in posture of the lift arm 4 as well as the hook arm 6. In this case, for example, a specific release switch may be provided to release the prohibition, and the change in posture of the hook arm 6 and lift arm 4 may be permitted by releasing the release switch. The sensors for detecting the posture of the lift arm 4 and hook arm 6 are not limited to those shown in the embodiment. In other words, any sensor capable of detecting the posture of the lift arm 4 and hook arm 6 is acceptable, and the type of sensor and its location are not limited. For example, it may be a limit switch, or detection may be based on detection information from multiple sensors, not just one. The sensor for detecting the tilted posture of the lift arm 4 may detect the posture when the lift arm 4 is completely tilted, or it may detect the posture immediately before tilting and define that posture as the tilted posture. In this case, the "immediate position" should be the position of the lift arm 4 when the interlocking part 21 and the locking engagement parts 17 and 18 begin to interfere with each other. Furthermore, the sensor for detecting the travel position of the hook arm 6 may, in addition to detecting the position when the hook arm 6 has completely changed to the travel position, detect the position just before the hook arm 6 assumes the travel position and use that position as the travel position. In this case, the "immediate position" should be the position of the hook arm 6 when the interlocking part 21 and the locking engagement parts 17 and 18 begin to interfere with each other.

[0083] Furthermore, in the above embodiment, the control device 31 prohibited the change in posture of the hook arm 6 from a traveling posture to a non-traveling posture approaching the rotation center of the lift arm 4 when all three sensors 28, 29, and 30 were in a detection state. However, the control device may be configured not to prohibit the change in posture of the hook arm 6 under any circumstances.

[0084] Furthermore, although multiple (two) support parts 25 are provided in the above embodiment, it may also be implemented with only one support part. Also, although the hook arm rod 23 was configured to be movable in the front-rear direction by multiple support parts 25 (two spaced apart in the front-rear direction in Figure 6) attached to the lower surface of the lift arm 4, it may also be configured in which a link 33 is formed by modifying the support part 25 that supports the hook arm rod 23 so as to be movable in the front-rear direction, and the lift arm 4 and the operating part 24 are connected via this link 33. The operating part 24 is connected to the rear end of the hook arm rod 23, and the operating part 24 and the hook arm rod 23 constitute the interlocking part 21. More specifically, as shown in Figures 24 and 25, a pair of brackets 34, 34 are fixed to both sides of the rear of the lift arm 4 by a number of bolts (or welds) 35, 35. The lower part of each bracket 34 is connected to one end of a link 33 by a pin 36, and the other end of the pair of links 33, 33 is connected to the operating part 24 by a single pin 37. A pair of pipes 38, 38 are fitted onto the pin 37 to regulate the position of the operating part 24 relative to one link 33 and the position of the operating part 24 relative to the other link 33. Each bracket 34 includes a vertically elongated first vertical plate portion 34A fixed to the lateral rear portion of the lift arm 4, a horizontal plate portion 34B bent 90 degrees from the lower end of the first vertical plate portion 34A so as to extend inward in the left-right direction, and a second vertical plate portion 34C bent 90 degrees from the inner end of the horizontal plate portion 34B so as to extend downward, to which one end of the link 33 is connected via a pin 36. Furthermore, the operating portion 24 has a different shape from the one described in the above embodiment (for example, the shape of the operating portion 24 in Figure 19). Specifically, as shown in Figure 25, the operating portion 24 includes a base portion 232 on which a female screw member 231, which has a female screw portion formed thereon that screws into the male screw portion at the rear end of the hook arm rod 23, is mounted and welded, and a rear portion 233 extending rearward from the upper rear end of the base portion 232. The rear end of the base portion 232 has a curved surface 232A that is located further forward as it goes upward. This curved surface 232A, from the state shown in Figure 22, contacts the rod 22 from the front as the hook arm rod 23 moves backward, and serves as a guide surface that guides the rod 22 to move upward.Furthermore, the lower surface of the rear portion 233 is provided with an inclined surface 233A, which is a flat surface located from its rear end to approximately half the total length of the rear portion 233, and is positioned upward as it moves forward. This inclined surface 233A constitutes a guide surface that pushes the rod 22 downward as the hook arm rod 23 moves forward from the state shown in Figure 23. Note that components that are not described are the same as those in the previously described embodiment, and are therefore given the same reference numerals and their descriptions are omitted.

[0085] As described above, the operation of lowering the container Ct from the subframe 1 to the ground using the configuration in which the lift arm 4 and the operating unit 24 are connected by links 33, 33 will now be explained. Starting from the drivable state in which the container Ct is mounted on the subframes 1, 1 of the container transport vehicle V as shown in Figure 1, the hook cylinder 9 is extended. This causes the hook arm 6 to tilt (change its posture) to the rear, changing its posture to the second posture (see Figure 2). This change in posture, that is, the change in posture from the dashed line to the solid line in Figure 22, pulls the rod 23 for the hook arm, causing the link 33 to swing around the pin 36. As a result, the operating unit 24 moves forward and downward, and the rod 22, which was locked to the upper end of the curved surface 232A, comes into contact with the inclined surface 233A and is pushed downward along the inclined surface 233A. When the rod 22 moves to the rear end of the inclined surface 233A, the locking engagement part 17 rotates around the horizontal axis X due to its own weight, causing the rod 22 to descend so as to disengage from the lower end of the inclined surface 233A, and the operating part 24 moves further forward (see Figure 22). This releases the locking engagement part 17 from the locking engagement part 19, and the arm lock device 14 is unlocked from the locking engagement part 19. Once the arm lock device 14 is unlocked, as described above, the operation of the hook cylinder 9 remains stopped, and the extension operation of the lift cylinder 5 is started to rotate the lift arm 4, lifting the container Ct and moving it backward (see Figure 3). Furthermore, while the lift cylinder 5 is extended, the container Ct is lowered to the ground, and the lowering operation of the container Ct is completed (see Figure 4).

[0086] Conversely, the loading operation when placing a container Ct that has been lowered to the ground onto the subframe 1 will now be described. The lifting of the container Ct begins with the same angle of the hook arm 6 and lift arm 4 as in the state shown in Figure 4 during loading and unloading. That is, the lift cylinder 5 is shortened to rotate the lift arm 4 forward to the state shown in Figure 3, and then the lift arm 4 is rotated further forward to show the state in which the lift arm 4 is placed on the subframe 1 as shown in Figure 2. From this state, the hook cylinder 9 is shortened to move the hook arm rod 23 to the rear. As a result, the link 33 swings upward around the pin 36 from the state shown in Figure 22. Then the operating part 24 swings upward and the curved surface 232A of the operating part 24 comes into contact with the rod 22, and as the operating part 24 swings upward while pushing the rod 22, the rod 22 moves to the upper end of the curved surface 232A. This movement causes the locking engagement portion 17 to rotate around the horizontal axis X and assume an upright position, thereby engaging with the locked engagement portion 19, and the arm lock device 14 becomes locked (see Figure 23). As described above, the locking engagement portion 17 can be easily lifted by swinging the operating portion 24 backward and upward by the link 33, bringing it into contact with the rod 22 and moving the rod 22 upward.

[0087] As shown in Figure 26, in the traveling position of the hook arm 6, the height (distance) from the lower surface 4A of the lift arm 4 to the lower surface of the operating part 24 (base end 232), shown by the solid line, is lower (shorter) than the height (distance) from the lower surface 4A of the lift arm 4 to the upper surface of the rods 22 of the lock engagement parts 17 and 18 in the unlocked state. In other words, a clearance part 232B, i.e., a space 232H, is provided below the operating part 24 (base end 232) to prevent interference with the lock engagement parts 17 and 18. Therefore, even if the hook arm 6 is changed to the traveling position due to an operating error or the like before the lift arm 4 lands with the lock engagement parts 17 and 18 in the unlocked state, interference between the operating part 24 and the lock engagement parts 17 and 18 can be prevented. Specifically, the front lower surface of the base end 232 of the operating part 24 is provided with a clearance part 232B to form a space 232H so as not to interfere with the lock engagement parts 17 and 18. More specifically, a relief portion 232B is provided on the front lower surface in the range between the movement trajectories S1 and S2 of the rear and front ends of the curved surface 232A (i.e., the movement trajectory of the curved surface 232A). The space 232H formed by this relief portion 232B prevents the operating portion 24, which has been moved from a forward position (dotted line) to a rear position (solid line) due to an operating error or the like before the lift arm 4 lands, from interfering with the rods 22 of the lock engagement portions 17 and 18 in the unlocked state when the lift arm 4 lands as shown in Figure 26.

[0088] Furthermore, in the above embodiment, the operating part 24 of the interlocking part 21 and the rod 22 of the locking engagement part 17 were in an unconnected state, but the device may also be implemented in a connected state in which the operating part 24 of the interlocking part 21 and the rod 22 of the locking engagement part 17 are connected by a link.

[0089] In the above embodiment, the operating device was configured to operate the arm lock device 14 in conjunction with the movement of the hook arm 6 by being directly attached to the hook arm 6. However, for example, the operating device may be separated from the hook arm 6. In this case, however, a configuration is required to detect the movement of the hook arm 6 and activate the operating device.

[0090] In the above embodiment, the operating device was configured to operate the arm lock device 14 in response to the movement of the hook arm 6 via the interlocking unit 21. However, for example, the interlocking unit 21 may be configured to operate the float stopper device 39 or the coupling interlocking unit 40 in response to the movement of the hook arm 6.

[0091] In the above embodiment, the connecting interlocking unit 40 was configured to connect the locking engagement unit 18 and the float-stopping shaft 3911. However, for example, it may be configured to connect the locking shaft X1 and the float-stopping movable unit 3912, or to connect the locking shaft X1 and the float-stopping shaft 3911, or to connect the locking engagement unit 18 and the float-stopping movable unit 3912.

[0092] In the above embodiment, the floating-preventing movable part 3912 was configured to restrict the floating of the dump arm 3 relative to the subframe 1 by contacting the floating-preventing fixed part 390 from below. However, it may also be configured to restrict the floating of the dump arm 3 relative to the subframe 1 by engaging it with, for example, the floating-preventing fixed part 390. [Explanation of Symbols]

[0093] 1...Subframe, 1B...Transverse frame, 2...Guide roller, 3...Dump arm, 3B...Intermediate transverse frame, 3C...Front transverse frame, 3D...Support shaft, 3T...Transverse shaft, 4...Lift arm, 4A...Underside, 4D...Dump shaft, 5...Lift cylinder, 6...Hook arm, 7...Transverse shaft, 8...Hook, 9...Hook cylinder, 10...Support leg, 11...Travel wheel, 12...Engaging part, 13...Rear gate, 14...Arm lock device, 15,16...Bracket, 17,18...Locking engaging part, 17K,1 8K... Locking notch, 19, 20... Locking engagement part, 21... Interlocking part, 22... Rod, 23... Rod for hook arm, 24... Operating part, 24A... Base end, 24B... Tip, 24C... Contact part, 24H... Space, 24K... Inclined surface, 24M... Guide groove, 24N... Relief part, 24c... Contact surface, 25... Support part, 26... First mounting member, 27... Second mounting member, 28... First sensor, 29... Second sensor, 30... Third sensor, 30A... Proximity dog, 31... Control device, 32... Prohibition means, 33... Ring 34...Bracket, 34A...First vertical plate section, 34B...Horizontal plate section, 34C...Second vertical plate section, 36...Pin, 37...Pin, 38...Pipe, 39...Float prevention device, 40...Connecting interlocking section, 231...Female screw member, 232...Base end, 232A...Curved surface, 232B...Relief section, 232H...Space, 233...Rear side section, 233A...Inclined surface, 390...Float prevention fixing section, 390A...Inner bracket, 390B...Reinforcement rib, 391...Float prevention engaging section, 400...Arm side connecting section, 401...Float prevention side connecting section, 3910...Float Stop bracket, 3911…float prevention shaft, 3912…float prevention movable part, 3913…fixed end, 3914…fixed extension part, 4000…connecting extension part, 4001…connecting pin, 4010…float prevention side plate, 4011…float prevention side fixing means, 4012…plate fixing part, 4013…plate extension part, Ca…driver's cab, Ct…container, D…jacking device, F…chassis frame, GR…ground, S1, S2…movement trajectory, V…container transport vehicle, X1…locking shaft, X…horizontal axis of locking shaft, d…jacking part

Claims

1. The vehicle body frame extends in the front-to-rear direction, A dump arm extending in the front-rear direction and having its rear end in the front-rear direction rotatably connected to the vehicle frame around an axis in the width direction of the vehicle, which rotates up and down relative to the vehicle frame, A lift arm is positioned in front of the dump arm, and its rear end in the front-rear direction is rotatably connected to the dump arm around the axis in the width direction, and the lift arm rotates up and down relative to the dump arm. A hook arm is connected to the lift arm so as to be movable in the front-rear direction and to which a container can be attached and detached, An arm locking device that can switch between a restricted state in which the luffing rotation of the lift arm relative to the dump arm is restricted and a release state in which the restriction is released, A floating prevention device that can switch between a floating restriction state in which the lifting of the dump arm due to the up-and-down rotation of the vehicle frame is restricted, and a floating restriction release state in which the restriction on the lifting is released, A connecting interlocking unit is provided, which is connected to the arm lock device and the float stop device, and which synchronizes the switching operation of the arm lock device and the float stop device. The system includes an operating device that activates one of the arm locking device, the float stopper, and the connecting interlocking part in response to the movement of the hook arm relative to the lift arm, A container transport vehicle configured such that by operating any one of the arm lock device, the float stopper device, and the coupling interlocking unit via the aforementioned operating device, the switching operation of the arm lock device and the float stopper device is linked via the coupling interlocking unit, and the vehicle switches between a loading / unloading state in which the arm lock device is in the release state and the float stopper device is in the float restriction state, and a dump state in which the arm lock device is in the restriction state and the float stopper device is in the release state.

2. The aforementioned arm lock device is A locking shaft provided on the dump arm and extending in the width direction, A locking engagement portion is provided so as to be rotatable around the locking shaft, The lift arm is provided with a lock-engaged portion into which the lock-engaging portion can engage, The locking engagement portion is configured to be switchable between a restricted state in which it is engaged with the locked engagement portion by rotating around the locking shaft, and a released state in which it is released from engagement with the locked engagement portion. The aforementioned float-preventing device is A float stopper shaft is provided on the dump arm and extends in the width direction, A floating-stopping movable part is provided so as to be rotatable around the floating-stopping shaft, It comprises a fixing portion that is fixed to the vehicle body frame and into which the floating movable portion can make contact, The floating-restricting movable part rotates around the floating-restricting shaft, causing the dump arm to rotate to the upright side. The floating-restricting movable part is configured to be switchable between a floating-restricting state in which it is positioned to contact the floating-restricting fixed part, and a floating-restricting release state in which it is positioned not to contact the floating-restricting fixed part. The locking shaft and the float-preventing shaft are arranged coaxially. A container transport vehicle according to claim 1.

3. The aforementioned connecting interlocking part is provided between the arm lock device and the anti-float device and comprises a connecting body that connects one of the lock shaft and the lock engagement part with the other of the anti-float shaft and the anti-float movable part. A container transport vehicle according to claim 2.

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