JP2005343407A - Vehicular cargo handling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply realize prevention of inclination of a loading platform during lifting and freely change timing of releasing the loading platform inclination regulation for dealing with a vehicle different in the height of its car body floor surface without substantially altering the device and causing complexity of a structure and steep rise in cost in a cargo device provided with a tilt arm. <P>SOLUTION: An adjustment bolt 25 is mounted on an base end side of a lift arm 5 so as to make a space between itself and a safety lever 15 non-stepwise adjustable. When the loading platform descends and approaches to a ground or contacts with the ground, by turning the adjustment bolt 25 abutted to the safety lever 15, an engagement part 15a of the safety lever 15 is separated from a stopper 14, the tilt arm 4 is turned and a distal end of the loading platform is inclined with its front downward to contact the ground. At the time otherwise, the engagement part 15a is engaged with the stopper 14 so as not to turn the tilt arm 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement of a vehicle handling apparatus having a loading platform for loading and unloading a load when loading and unloading, and more particularly, for example, tilting when an overload is applied to the tip of the loading platform. It relates to prevention measures.

  As a loading / unloading device for a vehicle, the loading platform base end is cantilevered by a parallel link mechanism, and the loading platform is moved up and down in a horizontal posture by the expansion and contraction of the hydraulic cylinder. 2. Description of the Related Art There is known a cargo handling device configured to tilt a front end downward and ground the tip. In such a cargo handling apparatus, when the upper end of the tilt arm is pivotally attached to the vehicle body fixed side as a component of the parallel link mechanism, for example, an overload is applied to the tip of the loading platform from above during the lifting and lowering of the loading platform. If the tilt arm is separated from the vehicle body fixing side, the loading platform tilts and cannot maintain the horizontal posture, and the load falls, which is very dangerous and hinders the cargo handling operation.

  By the way, as a type of loading / unloading apparatus that does not include a tilt arm, there is one that has taken a measure for preventing the loading platform from being tilted (see, for example, Patent Document 1). In this cargo handling device, a rotary side plate is pivotally attached to a rotary shaft that is rotated by an expansion and contraction operation of a hydraulic cylinder, a lift arm of a parallel link mechanism is pivotally attached to the rotary side plate, and a rod-like forced cam is attached to the rotary side plate. While being pivotally attached, a deterrent member is provided on the lift arm. The forced cam includes a first cam portion having a large radius of curvature, a second cam portion having a smaller radius of curvature than the first cam portion, and a linear portion continuously formed from one end side to the other end side, Either one of the first cam portion and the second cam portion slides on the support shaft of the upper tension arm according to the rotational posture of the rotary side plate, and the tip of the linear portion comes into contact with and separates from the restraining member. It has become. Then, when the loading platform is raised, the rotating side plate is rotated by the extension operation of the hydraulic cylinder, and the lift arm is supported and pushed up from the lower side by the rotating side plate. By sliding, the tip of the straight portion is pressed against the restraining member from above, and the loading platform is raised in a horizontal posture so as not to tilt. On the other hand, when the loading platform is lowered, the rotation side plate is rotated in the opposite direction by the contraction operation of the hydraulic cylinder, the lift arm is moved down following the rotation side plate, and the first cam portion of the forcible cam is brought into contact with the lift arm. Instead of the second cam part, the tip of the straight line part is detached from the restraining member by sliding on the support shaft of the tension arm, allowing the tip of the loading platform to tilt and allowing the tip of the loading platform to lean forward. ing.

On the other hand, as a type of cargo handling device provided with a tilt arm, there is one in which measures for preventing the loading platform from being tilted are taken (for example, see Patent Document 2). In this loading / unloading device, in addition to the hydraulic cylinder for raising and lowering the loading platform, a new hydraulic cylinder is incorporated into the parallel link mechanism so that the parallel state of the parallel link mechanism does not collapse when the loading platform is raised or lowered.
Japanese Utility Model Publication No. 63-23228 (page 2, FIG. 1, FIGS. 4 to 8) Japanese Patent No. 3035470 (pages 4 and 5, FIGS. 2 to 6)

  However, in the cargo handling device of Patent Document 1, in order to stably hold the loading platform in a horizontal position when ascending / descending, and tilting when contacting the ground, the shape of the first cam portion and the second cam portion of the forced cam is changed to the rotary side plate. It has to be formed with high precision in relation to the rotational movement of, and is difficult to manufacture. In addition, the cargo handling device of Patent Document 1 is a type that does not include a tilt arm, and in order to apply the cam mechanism to a cargo handling device that includes a tilt arm, it can be applied as it is because of restrictions on the installation space and differences in structure. It cannot be done, and even if it is installed, it must be remodeled.

  On the other hand, in the cargo handling device disclosed in Patent Document 2, the structure becomes complicated and the cost increases because the hydraulic cylinder is newly incorporated in the parallel link mechanism. In addition, since the hydraulic path between the hydraulic cylinder and the hydraulic cylinder that lifts and lowers the loading platform is connected to synchronize the hydraulic cylinders, the hydraulic path becomes complicated, and the complexity of the structure and the cost increase are promoted.

  The present invention has been made in view of the above points, and an object of the present invention is to make a cargo handling apparatus equipped with a tilt arm without significantly modifying the apparatus, and to complicate the structure and increase the cost. It is easy to prevent tilting during lifting of the loading platform. Furthermore, the timing for releasing the tilt restriction of the loading platform can be freely changed for vehicles having different vehicle body floor heights.

  In order to achieve the above-mentioned object, the present invention provides a structure for locking a parallel link mechanism so as not to move by hooking a latching means on a vehicle body fixed side as a countermeasure for tilting a loading platform of a cargo handling device having a tilt arm. Furthermore, the timing of unlocking the vehicle with different vehicle body floor heights can be freely changed.

  Specifically, the present invention includes a loading platform for loading and lowering a load, and two sets of parallel link mechanisms that cantilever support the loading platform base end on both sides, A tilt arm whose upper end is pivotally attached to the vehicle body fixing side, a lift arm whose base end is near the upper end of the tilt arm, and whose tip is pivotally attached to the base end of the loading platform. A lift cylinder having one end pivotally attached to the lower end of the tilt arm and the other end pivotally attached to the tip of the lift arm. The two tilt arms are lifted and lowered between the floor level and the body when the loading platform is grounded in a horizontal position. The loading platform tip is tilted to the forward descending intended for cargo apparatus for a vehicle configured to be grounded to pivot in a direction away from Jogawa, it took solving means as follows.

  That is, according to the first aspect of the present invention, a stopper is fixed at a position corresponding to at least one of the parallel link mechanisms on the vehicle body fixing side, and the upper end side of the tilt arm on the stopper side is hooked at the tip. The safety lever is pivotally attached, and this safety lever is urged by the urging means so that the hooking portion is hooked on the stopper, and a safety lever is attached to the lift arm base end side of the stopper side. A turning operation means for turning is provided in a stepless manner so as to adjust a distance from the safety lever, and the turning operation means is provided when the loading platform is lowered and approaches the ground or comes into contact with the ground. The latching portion is configured to be detached from the stopper by rotating the safety lever in contact with the stopper.

  According to a second aspect of the present invention, a stopper is fixed at a position corresponding to at least one parallel link mechanism on the vehicle body fixing side, and a latching portion is provided at one end on the upper end side of the tilt arm on the stopper side. The safety lever is pivotally attached, and this safety lever is urged by the urging means so that the hooking portion is hooked on the stopper, and the safety lever is rotated on the lift arm base end side on the stopper side. A pivoting operation means is fixedly provided, and the safety lever is provided with a contacted means with which the pivoting operation means abuts so that the interval between the pivoting operation means can be adjusted steplessly. When the loading platform descends and approaches the ground or touches the ground, the moving operation means abuts against the abutted means and rotates the safety lever so that the latching portion is removed from the stopper. Characterized in that it is configured to de.

  According to the invention according to claim 1, until the loading platform descends and approaches the ground or until it contacts the ground, the latching portion of the safety lever is latched on the stopper and is in a locked state. Even if a tensile force is applied to the tilt arm due to an overload applied to the tip of the loading platform, the safety lever does not move away from the vehicle body fixing side, so that the parallel state of the parallel link mechanism does not collapse, The platform is maintained in a horizontal position to prevent the cargo from falling, and the cargo handling operation is performed safely. On the other hand, when the loading platform descends and approaches the ground or comes into contact with the ground, the safety lever is rotated by the rotating operation means, and the latching portion is released from the stopper and the locked state is released. Therefore, the loading platform assumes a forward leaning posture in a grounded state due to its own weight or a total load obtained by adding the load of the load to the platform.

  In this way, it is only necessary to engage and disengage the latching part of the safety lever with respect to the stopper, and it is not necessary to adopt a cam mechanism that requires high-precision machining or to make a major modification. There is no need to incorporate it into a mechanism or to synchronize with a hydraulic cylinder that raises and lowers the loading platform, and an inexpensive cargo handling device can be easily realized with a simple structure.

  In addition, it is possible to adjust the unlocking timing for vehicles with different vehicle body floor heights relative to the ground of the loading platform by simply adjusting the distance between the turning operation means and the safety lever by operating the turning operation means. It can be freely changed so that the relationship is substantially the same, and a cargo handling device rich in versatility can be obtained.

  According to the second aspect of the invention, conversely to the first aspect, the contacted means provided on the safety lever is operated so that the distance between the contacted means and the rotation operation means on the lift arm side is increased. Since it is only necessary to adjust steplessly according to the floor surface height, the same effects as those of the first aspect can be achieved.

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

(Embodiment 1)
8-11 shows the cargo handling apparatus A according to Embodiment 1 installed under the floor at the rear end of a vehicle such as a truck. This loading / unloading device A includes a loading platform 1 for loading and lowering a load and two sets of parallel link mechanisms 2 that cantilever-support the base end of the loading platform 1 on both sides, and these two sets of parallel links By the synchronous operation of the mechanism 2, the loading platform 1 is in the retracted state of FIG. 8, at the vehicle body floor height in FIG. 9, in the grounded state in the horizontal posture in FIG. 10, and tilted at the tip in FIG. The posture is changed to each of the states.

  8 to 11, B1 is a vehicle body floor surface, B2 is a support frame having a closed cross-sectional shape extending in the vehicle width direction and constituting the vehicle body fixed side, and this support frame B2 extends in the vehicle longitudinal direction on both sides in the vehicle width direction. It is fixed to a chassis frame (not shown) via a fixed bracket B3. A first support bracket B4 and a second support bracket B5 are disposed on the side of the fixed bracket B3 of the support frame B2.

  On the other hand, the parallel link mechanism 2 has a substantially cross-sectional shape in which the upper end is pivotally attached to the first support bracket B4 by the connecting shaft 3 so as to be rotatable in the vertical direction, as shown in enlarged detail in FIGS. This is provided with a tilt arm 4 having the shape of a letter. Near the upper end of the tilt arm 4, the base end of the lift arm 5 is pivotally attached to the connecting shaft 6 so as to be pivotable in the vertical direction. The tip of the lift arm 5 is vertically connected to the base end of the loading platform 1 by the connecting shaft 7. It is pivotally attached to the direction. A lift cylinder 8 made of a hydraulic cylinder is disposed below the lift arm 5, and one end (base end of the cylinder tube 8 a) of the lift cylinder 8 is pivotable in the vertical direction by a connecting shaft 9 at the lower end of the tilt arm 4. While being pivotally attached, the other end (tip of the piston rod 8b) is pivotally attached to the lift arm 5 near the tip of the lift arm 5 so as to be rotatable in the vertical direction. One end (cylinder tube 11a base end) of a tilt cylinder 11 formed of a hydraulic cylinder is pivotally attached to the base end of the loading platform 1 so as to be rotatable in the vertical direction by a connecting shaft 12, and the other end of the tilt cylinder 11 ( The piston rod 11b tip) is pivotally attached to the second support bracket B5 by a connecting shaft 13 so as to be rotatable in the vertical direction.

  The tilt arm 4, the lift arm 5, the lift cylinder 8 and the tilt cylinder 11 constitute a parallel link mechanism 2. The lift cylinders 8 of the two sets of parallel link mechanisms 2 are loaded on the loading platform 1 by a synchronized expansion and contraction operation. Is moved up and down between the ground G and the vehicle body floor surface in a horizontal posture (see FIGS. 9 and 10). The two tilt cylinders 11 of the two sets of parallel link mechanisms 2 change the posture of the loading platform 1 between the horizontal posture and the vertical posture at the height of the vehicle body floor by synchronized expansion and contraction operations (see FIG. 8 and FIG. 8). (See FIG. 9). The two tilt arms 4 of the two parallel link mechanisms 2 are both supported by the weight of the loading platform 1 when the loading platform 1 is grounded in a horizontal posture or by the total load obtained by adding the load of the load to the supporting frame. It rotates about the connecting shaft 3 in a direction away from B2, and the tip of the loading platform 1 is tilted forward and lowered to be grounded (see FIGS. 10 and 11). In other words, when both the tilt arms 4 are rotated in the direction away from the support frame B2, the lift arms 5 are moved so as to be pushed out to the front end side of the loading platform 1 by this rotation. As a result, the loading platform 1 is It rotates around the connecting shaft 12 and is grounded in a forward inclined posture.

  As one of the features of the present invention, stoppers 14 are fixedly provided at locations corresponding to the two parallel link mechanisms 2 on the upper surface of the support frame B2. On the other hand, on the upper end side of both the tilt arms 4, the base end side of the safety lever 15 having a claw-shaped hooking portion 15a at the tip is pivotally attached to the connecting shaft 6 pivotally attached to the lift arm 5 so as to be pivotable in the vertical direction. Has been. The safety lever 15 is configured not to fall off the connecting shaft 6 by fitting the retaining plate 22 to the connecting shaft 6 and stopping it with a bolt 23. A mounting piece 19 projects downward from the base end portion 15b of both safety levers 15, and one end of a coil spring 16 as an urging means is connected to the lower end of the mounting piece 19 so that the coil spring 16 The other end is connected to the lower end of a mounting piece 17 projecting downward from each of the lift arms 5. As a result, the safety levers 15 are urged by the coil springs 16 so that the hooking portions 15 a are hooked on the stoppers 14. Note that a gap C (see FIGS. 1 and 6) is formed between the latching portion 15a and the stopper 14, and the safety lever 15 rotates around the connecting shaft 6 between the gap C. When moving, it is necessary to prevent the latching portion 15a from interfering with the stopper 14. However, when the loading platform 1 is slightly tilted by the load, the gap C is eliminated and the locked state is maintained. It is like that.

  As shown also in FIG. 1, a substantially rectangular mounting plate 20 is detachably attached to both lift arms 5 base end side (tilt arm 4 side). Specifically, as shown in FIG. 2, two screw holes 20 a are formed at one end side of the mounting plate 20 at intervals in the vertical direction. The shaft 6 is formed with a fitting groove 6a. The ends of the mounting plates 20 on the side without the screw holes 20a are removably fitted into the fitting grooves 6a of the connecting shaft 6, and the ends on the screw holes 20a side have two ends. By screwing the bolt 21 into the screw hole 20a, the bolt 21 is detachably fastened to the lift arm 5, whereby the connecting shaft 6 is prevented from rotating. A small diameter portion 6 b of the connecting shaft 6 shown in FIG. 2 is where the safety lever 15 is attached, and a screw hole 6 c is a screwed portion of a bolt 23 that stops the retaining plate 22.

  At the upper center of both the mounting plates 20, mounting blocks 24 are fixed so as to protrude toward the base end 15b side of the safety lever 15, respectively. A screw hole 24a is formed on the projecting end side of the mounting block 24, and an adjusting bolt 25 as a turning operation means (stepless adjustment mechanism) for turning the safety lever 15 in the screw hole 24a raises the head 25a. The shaft portion 25b is screwed so as to be able to advance and retract. A lock nut 26 is positioned so that the adjustment bolt 25 does not rotate. As a result, the adjustment bolt 25 faces the base end portion 15b of the safety lever 15 and is screwed back and forth by rotation around the shaft center so that the distance from the base end portion 15b is set according to the vehicle body floor height. Stepless adjustment is possible in the vertical direction. That is, in the case of a low-floor vehicle, the adjustment bolt 25 is screwed downward to accelerate the contact with the base end portion 15b of the safety lever 15, while in the case of a high-floor vehicle, the adjustment bolt 25 is screwed upward. Thus, the contact of the safety lever 15 with the base end portion 15b is delayed. Thereby, the unlocking timing of the safety lever 15 can be freely changed in accordance with the vehicle body floor height so that the positional relationship of the loading platform 1 with respect to the ground G is substantially the same. This is another feature of the present invention. When the loading platform 1 descends and approaches the ground G or comes into contact with the adjustment bolt 25, the lower end of the shaft portion 25b comes into contact with the base end portion 15b of the safety lever 15 from above and the safety lever 15 Is configured to release the locking portion 15a from the stopper 14 to release the locked state (see FIGS. 4, 7, and 10). As a result, the restraint state of the tilt arm 4 is released, and the loading platform 1 is allowed to tilt from the state of being grounded in the horizontal posture to the forward leaning posture.

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

  (1) FIG. 8 shows a state in which the loading platform 1 is stored in a vertical posture. In this retracted state, both lift cylinders 8 and both tilt cylinders 11 of the two sets of parallel link mechanisms 2 are extended, and the lift arm 5, lift cylinder 8 and tilt cylinder 11 are rotated upward to rearward the vehicle body. Holds an upwardly tilted posture. Both safety levers 15 are pulled upward by a coil spring 16 so that a latching portion 15a is latched on the stopper 14 and is in a locked state. Therefore, both the tilt arms 4 are restricted and cannot be rotated.

  (2) To shift the loading platform 1 from the retracted state to the in-use state, the hydraulic pressure is discharged from the non-rod-side working chambers of the two tilt cylinders 11 of the two parallel link mechanisms 2. As a result, both the tilt cylinders 11 are contracted synchronously, and the loading platform 1 is in a horizontal posture at the vehicle body floor surface height as shown in FIG. In this state, when unloading a load, the load is placed on the loading platform 1. The latching portions 15 a of both safety levers 15 are in a locked state while being latched on the stopper 14. Accordingly, during the operation of placing the load on the loading platform 1, even if, for example, an overload is applied to the tip of the loading platform 1 and a tensile force is applied to both the tilt arms 4, both safety levers 15 are supported by the support frame B2. Since the two parallel link mechanisms 2 are not separated from each other, the parallel state of the two sets of parallel link mechanisms 2 does not collapse, the horizontal posture of the loading platform 1 is maintained, and the cargo can be prevented from falling, and the cargo handling operation can be performed safely.

  (3) Next, the hydraulic pressure is discharged from the non-rod side working chambers of both lift cylinders 8. As a result, the lift cylinders 8 are contracted in synchronization with each other, the lift arm 5, the lift cylinder 8 and the tilt cylinder 11 are rotated downward, and the loading platform 1 is lowered in a horizontal posture from the vehicle body floor height. During this time, the latching portions 15a of the safety levers 15 remain locked on the stoppers 14 and are in a locked state, so that the parallel state of the two sets of parallel link mechanisms 2 is not broken and the loading platform 1 is not tilted. It can be lowered in a horizontal posture, and the load can be prevented from falling.

  (4) When the loading platform 1 descends and approaches the ground G, or when it is grounded in a horizontal position as shown in FIG. 10, the two adjustment bolts 25 are moved below the lift arm 5 by the two parallel link mechanisms 2. The base end 15b of both safety levers 15 is pressed from above by the lower end of the shaft portion 25b. As a result, both safety levers 15 rotate against the spring force of the coil spring 16, the latching portion 15a is detached from the stopper 14, the locked state is released, and the restrained state of both tilt arms 4 is released simultaneously. The At this time, in the grounded state, the loading platform 1 rotates around the connecting shaft 3 in a direction away from the support frame B2 by its own weight or a total load obtained by adding the load of the load, and accordingly, both tilt arms are rotated. When 4 is rotated in a direction away from the support frame B2, both lift arms 5 are moved so as to be pushed out to the front end side of the loading platform 1, and the parallel state of the two sets of parallel link mechanisms 2 breaks down. 11 rotates around the connecting shaft 12 as shown in FIG. With this forward leaning posture, the luggage is unloaded or placed on the loading platform 1.

  (5) Next, when returning the loading platform 1 to the retracted state of the vertical posture or loading the load on the vehicle, hydraulic pressure is supplied to the anti-rod side working chambers of both lift cylinders 8. As a result, the lift cylinders 8 are extended in synchronization with each other, and the loading platform 1 is rotated around the connecting shaft 12 to return to the horizontal posture shown in FIG. 10, followed by the lift arm 5, the lift cylinder 8 and the tilt. The cylinder 11 rotates upward, and the loading platform 1 ascends in a horizontal posture to the height of the vehicle body floor as shown in FIG. In this case, when the loading platform 1 moves away from the ground G or ascends to a predetermined height from the ground G, the lower ends of the shaft portions 25b of the two adjustment bolts 25 are rotated upwardly of the lift arm 5 by the two sets of parallel link mechanisms 2. With the movement, both the safety levers 15 are separated from each other, and the base end portions 15b of the safety levers 15 are pulled by the coil springs 16 and rotated upward, so that the latching portions 15a are latched on the stoppers 14 to be locked. Both safety levers 15 are restrained and cannot be rotated. Therefore, even if a tensile force is applied to both the tilt arms 4 due to an overload applied to the tip of the loading platform 1 ascending, the safety levers 15 are not separated from the support frame B2. The horizontal posture of 1 can be maintained and the fall of the load can be prevented. Further, when the loading platform 1 is raised to the vehicle body floor height as shown in FIG. 9 and loads are loaded onto the vehicle or pulled out to the loading platform 1, the loading platform 1 is maintained in the horizontal position. Cargo handling work can be performed safely.

  (6) When the loading / unloading of the load is completed and the loading platform 1 is stored at the vehicle body floor height in FIG. 9 from the horizontal posture to the vertical posture in FIG. It is only necessary to supply hydraulic pressure to the chamber and rotate the loading platform 1 around the connecting shaft 7 by operating both the tilt cylinders 11 to extend in synchronization.

  As described above, in the first embodiment, since the latching portion 15a of the safety lever 15 only needs to be engaged with and disengaged from the stopper 14, it is necessary to employ a cam mechanism that requires high-precision machining or a large modification. In addition, there is no need to incorporate a hydraulic cylinder into the parallel link mechanism or to synchronize with the hydraulic cylinder that raises and lowers the loading platform, and an inexpensive cargo handling apparatus A can be easily realized.

  Further, in the first embodiment, the height of the vehicle body floor surface can be obtained by simply adjusting the distance between the lower end of the shaft portion 25b of the adjustment bolt 25 and the base end portion 15b of the safety lever 15 by screwing the adjustment bolt 25 back and forth. It is possible to freely change the timing of unlocking the vehicles with different velocities so that the positional relationship of the loading platform 1 with respect to the ground G is substantially the same, and the cargo handling apparatus A with high versatility can be obtained.

  Furthermore, in the first embodiment, the end portions of the mounting plates 20 on the side where there is no screw hole 20a are detachably fitted into the fitting grooves 6a of the connecting shaft 6, and the end portions on the screw hole 20a side are bolted. Since it is detachably fastened at 21, the connecting shaft 6 can be prevented from rotating with a simple structure.

(Embodiment 2)
12 and 13 show Embodiment 2 of the present invention. In the second embodiment, the rod 27 as a rotation operation means for rotating the safety lever 15 is fixed horizontally so as to face the upper part of the base end portion 15b of the safety lever 15 toward the upper center of both mounting plates 20, respectively. And an adjusting bolt 28 as a contacted means (stepless adjustment mechanism) in which the rod 27 is in contact with the base end portion 15b of both safety levers 15 is screwed back and forth by rotation around the axis. Thus, the distance from the rod 27 can be adjusted steplessly. Specifically, a screw hole 15c is formed in the base end portion 15b of the safety lever 15, and an adjustment bolt 28 is screwed into the screw hole 15c so that the head portion 28a faces downward and the shaft portion 28b can be screwed back and forth. ing. A lock nut 29 is positioned so that the adjustment bolt 28 does not rotate. When the loading platform 1 is lowered and approaches the ground G or comes into contact with the ground, the rod 27 is applied to the upper end of the shaft portion 28b of the adjustment bolt 28 attached to the base end portion 15b of the safety lever 15 from above. By rotating the safety lever 15 in contact therewith, the locking portion 15a is detached from the stopper 14 to release the locked state. As a result, the restraint state of the tilt arm 4 is released, and the loading platform 1 is allowed to tilt from the state of being grounded in the horizontal posture to the forward leaning posture. Since the other configuration is the same as that of the first embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Therefore, in the second embodiment, the same function and effect as in the first embodiment can be achieved.

  In the first embodiment, the adjusting bolt 25 is disposed on the lift arm 5 so as to face the base end 15b of the safety lever 15, and the lower end of the shaft 25b of the adjusting bolt 25 is the base end 15b of the safety lever 15. The safety lever 15 is pivoted by abutting it from above, but conversely, the adjustment bolt 25 is disposed on the lift arm 5 so as to face the lower part of the middle of the safety lever 15, and the adjustment bolt 25. The safety lever 15 may be rotated by bringing the upper end of the shaft portion 25b into contact with the middle of the safety lever 15 from below. In the second embodiment, the adjustment bolt 28 is disposed at the base end portion 15b of the safety lever 15, and the rod 27 is disposed at the lift arm 5 so as to face the base end portion 15b of the safety lever 15. 27 is brought into contact with the upper end of the shaft portion 25b of the adjusting bolt 25 from above to rotate the safety lever 15, but conversely, the adjusting bolt 28 is disposed in the middle of the safety lever 15 and the rod 27 may be disposed on the lift arm 5 so as to face downward in the middle of the safety lever 15, and the safety lever 15 may be rotated by bringing the rod 27 into contact with the lower end of the shaft portion 25 b of the adjusting bolt 28 from below. .

  Furthermore, in each of the above-described embodiments, the adjustment bolts 25 and 28 that are rotated around the shaft center and screwed back and forth are employed as the stepless adjustment mechanism. However, the present invention is not limited to this. By doing so, a stepless adjustment mechanism may be configured.

  Further, in each of the above embodiments, the stopper 14, the safety lever 15, and the stepless adjustment mechanism (adjustment bolts 25 and 28) are provided in each of the two sets of parallel link mechanisms 2, but either one of the parallel link mechanisms 2. You may provide only.

  Further, in each of the above embodiments, the cylinder tube 11a base end of the tilt cylinder 11 is pivotally attached to the loading platform 1 base end, and the piston rod 11b tip is pivotally attached to the second support bracket B5. Instead, a compression arm may be used. In this case, the compression arm is pivotally attached to the base end of the loading platform 1 via a link.

  Furthermore, in each of the above embodiments, the cargo handling device A is applied to the rear end portion of the vehicle, but may be applied to the left end portion or the right end portion.

  INDUSTRIAL APPLICABILITY The present invention is useful as a vehicle loading / unloading device including a loading platform that loads and loads a load when loading / unloading the load.

It is a side view just before an adjustment bolt unlocks a safety lever in Embodiment 1. It is a disassembled perspective view before assembling the connecting shaft of the lift arm, the mounting plate to which the adjustment bolt is attached, and the safety lever in the first embodiment. FIG. 3 is a perspective view of a vehicle body fixing side portion of the parallel link mechanism in a locked state in the first embodiment. FIG. 3 is a perspective view of a vehicle body fixed side portion of the parallel link mechanism in an unlocked state in the first embodiment. FIG. 4 is a plan view of FIG. 3. FIG. 4 is a side view of FIG. 3. FIG. 5 is a side view of FIG. 4. It is a side view which shows the storage state of the loading platform in Embodiment 1. FIG. It is a side view which shows the state which has a loading platform in vehicle body floor surface height in Embodiment 1. FIG. It is a side view which shows the state which the loading platform grounded in the horizontal attitude | position in Embodiment 1. It is a side view which shows the state which inclined the loading platform front-end | tip in Embodiment 1, and was earth | grounded. FIG. 3 is a diagram corresponding to FIG. FIG. 3 is a diagram corresponding to FIG. 2 of the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Loading platform 2 Parallel link mechanism 4 Tilt arm 5 Lift arm 8 Lift cylinder 14 Stopper 15 Safety lever 15a Hanging part 15b Base end part 16 Coil spring (biasing means)
20 Mounting plate 25 Adjustment bolt (turning operation means)
27 Rod (Turning operation means)
28 Adjusting bolt (contacted means)
A Cargo handling device B1 Car body floor B2 Support frame (car body fixed side)
G ground

Claims (2)

A loading platform that lifts and lowers loads,
Two sets of parallel link mechanisms for cantilevering the loading platform base end on both sides,
The parallel link mechanism includes a tilt arm whose upper end is pivotally attached to the vehicle body fixing side,
A lift arm having a proximal end near the upper end of the tilt arm and a distal end pivotally attached to the loading platform proximal end;
The lift arm is arranged below the lift arm, and one end is provided at the lower end of the tilt arm and the other end is pivotally attached to the tip of the lift arm.
Both lift cylinders ascend and descend the loading platform in a horizontal position between the ground and the vehicle body floor height by synchronized expansion and contraction.
Both of the above tilt arms are configured so that, when the loading platform is grounded in a horizontal position, both of the tilt arms rotate in a direction away from the vehicle body fixing side and tilt the tip of the loading platform forward and downward to ground. A cargo handling device,
A stopper is fixed at a position corresponding to at least one parallel link mechanism on the vehicle body fixing side,
On the upper end side of the tilt arm on the stopper side, a safety lever having a hook at the tip is pivotally attached,
This safety lever is urged by the urging means so that the hooking portion is hooked on the stopper,
On the proximal end side of the lift arm on the stopper side, a turning operation means for turning the safety lever is provided so as to adjust the distance from the safety lever steplessly.
When the loading platform descends and approaches the ground or comes into contact with the ground, the rotating operation means contacts the safety lever and rotates the safety lever so that the latching portion is detached from the stopper. It is comprised in the vehicle cargo handling apparatus characterized by the above-mentioned. A loading platform that lifts and lowers loads,
Two sets of parallel link mechanisms for cantilevering the loading platform base end on both sides,
The parallel link mechanism includes a tilt arm whose upper end is pivotally attached to the vehicle body fixing side,
A lift arm having a proximal end near the upper end of the tilt arm and a distal end pivotally attached to the loading platform proximal end;
The lift arm is arranged below the lift arm, and one end is provided at the lower end of the tilt arm and the other end is pivotally attached to the tip of the lift arm.
Both lift cylinders ascend and descend the loading platform in a horizontal position between the ground and the vehicle body floor height by synchronized expansion and contraction.
Both of the above tilt arms are configured so that, when the loading platform is grounded in a horizontal position, both of the tilt arms rotate in a direction away from the vehicle body fixing side and tilt the tip of the loading platform forward and downward to ground. A cargo handling device,
A stopper is fixed at a position corresponding to at least one parallel link mechanism on the vehicle body fixing side,
A safety lever having a latching portion at one end is pivotally attached to the upper end side of the tilt arm on the stopper side,
This safety lever is urged by the urging means so that the hooking portion is hooked on the stopper,
On the proximal end side of the lift arm on the stopper side, a turning operation means for turning the safety lever is fixed,
The safety lever is provided with a contacted means with which the turning operation means comes in contact with the turning operation means so that the interval between the turning operation means can be adjusted steplessly.
When the loading platform descends and approaches the ground or comes into contact with the ground, the turning operation means comes into contact with the contacted means and rotates the safety lever to release the latching portion from the stopper. It is comprised so that it may make it the vehicle cargo handling apparatus characterized by the above-mentioned.

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