JP4000126B2 - Vehicle handling equipment - Google Patents

Description

  The present invention relates to an improvement of a vehicle handling apparatus having a loading platform for loading and unloading a load when loading and unloading the load, and more particularly, 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 below by the rotating side plate. At this time, the second cam portion of the forced cam is used as the support shaft of the tension arm. 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, a hydraulic cylinder is newly incorporated in the parallel link mechanism separately from the hydraulic cylinder that lifts and lowers the loading platform so that the parallel state of the parallel link mechanism does not collapse when the loading platform moves up and down.
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, it is intended to share parts 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 lock release timing for vehicles having different vehicle body floor heights is switched by one component.

  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 fixed side, a lift arm whose one end is near the upper end of the tilt arm and the other end is pivotally attached to the loading platform base end, and is disposed below the lift arm. 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 present invention, stoppers are respectively attached to portions corresponding to the two parallel link mechanisms on the vehicle body fixing side, and safety levers having a latching portion at one end are pivotally attached to the upper ends of the both tilt arms. The safety levers are urged by urging means so that the latching portions are latched on the stoppers, and operating rod mounting plates are detachably attached to one end sides of the lift arms, When the loading platform is lowered and touches the ground or touches the ground, the operation lever for rotating the safety lever to release the hook from the stopper is attached to the both operation rod mounting plates. Each of the plates is projected so that the mounting position can be changed in two stages in the vertical direction by exchanging the plates with each other.

  According to the present invention, until the loading platform descends and approaches the ground or comes into contact with the ground, since the latching portion of the safety lever is locked by the stopper, for example, the loading platform Even if a tensile force is applied to the tilt arm due to an overload applied to the tip, the safety lever does not move away from the vehicle body fixing side, so the parallel state of the parallel link mechanism does not collapse, and the horizontal posture of the loading platform Is maintained, the fall of the load is prevented, and the cargo handling work is performed safely. On the other hand, when the loading platform descends and approaches the ground or touches the ground, the safety lever is rotated by the operating rod, and the locking part is released from the stopper to release the locked state. 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.

  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.

  Also, by replacing the two sets of parallel link mechanism operation rod mounting plates with each other, the operation rod mounting position can be changed and set in two stages in the vertical direction, and the unlock timing for vehicles with different vehicle body floor heights. Can be switched with one component so that the positional relationship of the loading platform with respect to the ground is substantially the same. Therefore, one cargo handling device can be applied to a low-floor vehicle and a high-floor vehicle, and a cargo handling device rich in versatility can be obtained.

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

  10 to 13 show a cargo handling apparatus A 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. 10, at the vehicle body floor height in FIG. 11, grounded in the horizontal posture of FIG. 12, and tilted at the tip of FIG. The posture is changed to each of the states.

  10-13, B1 is a vehicle body floor surface, B2 is a support frame of the closed cross-sectional shape which comprises the vehicle body fixed side extended in the vehicle width direction, and this support frame B2 is extended in the vehicle body front-back direction at both vehicle width direction sides. 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, as shown in FIGS. 5 to 9 in an enlarged manner, the parallel link mechanism 2 has a substantially cross-section with an upper end pivotally attached to the first support bracket B4 by a connecting shaft 3 so as to be pivotable in the vertical direction. This is provided with a tilt arm 4 having the shape of a letter. Near the upper end of the tilt arm 4, one end of the lift arm 5 is pivotally attached to the connecting shaft 6 so as to be rotatable in the vertical direction. The other end 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 raised and lowered between the ground G and the vehicle body floor surface in a horizontal posture (see FIGS. 11 and 12). 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 surface by synchronized expansion and contraction operations (see FIG. 10 and FIG. 10). FIG. 11). The two tilt arms 4 of the two parallel link mechanisms 2 are both supported by the weight of the loading platform 1 when the loading platform 1 is grounded in a horizontal posture or by the total load obtained by adding the load of the load to the supporting frame. It rotates around the connecting shaft 3 in a direction away from B2, and the tip of the loading platform 1 is tilted forward and lowered to be grounded (see FIGS. 12 and 13). 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 tilt posture.

  As one of the features of the present invention, stoppers 14 are respectively attached to portions on the upper surface of the support frame B2 corresponding to the two parallel link mechanisms 2. On the other hand, the other end side of the safety lever 15 having a claw-like hooking portion 15a at one end is pivotally attached to the upper end side of both the tilt arms 4 so as to be pivotable in the vertical direction by a connecting shaft 6 that pivotally attaches the lift arm 5. 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 protrudes downward from the other end of each of the safety levers 15, and one end of a coil spring 16 as a biasing means is connected to the lower end of the mounting piece 19, and the other end of the coil spring 16 is connected. Are connected to the lower ends of mounting pieces 17 projecting downward on the lift arms 5 respectively, whereby the safety levers 15 are respectively coil springs so that the latching portions 15a are latched on the stoppers 14 respectively. 16 is energized. Note that a gap C (see FIGS. 1 and 8) is formed between the hook 15a and the stopper 14, and the operation rod 18 described later is formed around the connecting shaft 6 in the gap C. This is necessary to prevent the stopper 14 from interfering with the rotation of the loading platform 1, and the loading platform 1 is slightly tilted by the load so that the gap C is eliminated and the locked state is maintained. .

  As shown in FIG. 1, a substantially rectangular operating rod mounting plate 20 is detachably attached to one end side of the lift arms 5 (tilt arm 4 side). Specifically, as shown in FIGS. 2 to 4, two screw holes 20 a are formed on one end side of the operation rod mounting plate 20 with a space therebetween in the vertical direction. As shown in FIG. 2, fitting grooves 6 a are respectively formed in the connecting shaft 6 that is pivotally attached. The ends of the operating rod 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 are two. By screwing the bolt 21 into the screw hole 20a, the bolt 21 is detachably fastened to the lift arm 5, thereby preventing the connecting shaft 6 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.

  As shown in FIG. 3 and FIG. 4, the operation rod 18 is provided on both the operation rod mounting plates 20 so that the operation position can be changed in two steps in the vertical direction by exchanging the two operation rod mounting plates 20 with each other. Projected. Specifically, the operating rods 18 are integrally protruded from the center X of the both operating rod mounting plates 20 at positions that are unevenly distributed upward or downward. This is another feature of the present invention. The both operating rod mounting plates 20 are attached to one end side (tilt arm 4 side) of both lift arms 5 such that the operating rod 18 faces the other end side of the safety lever 15 (on the side of the counter hooking portion 15a). Yes. A rounded portion 20b is formed at a corner portion of the operating rod mounting plate 20 on the screw hole 20a side where the operating rod 18 is unevenly distributed from the center X. Is to determine the unevenly distributed side.

  FIGS. 1A and 1B both show a state immediately before the operating rod 18 unlocks the safety lever 15, and in FIG. 1A, the operating rod 18 starts from the center X of the operating rod mounting plate 20. FIG. 1B shows the mounting state for the low floor vehicle with the unevenly distributed side (the rounded portion 20b) facing downward, and FIG. The mounting state for a raised floor car is shown. In this embodiment, a low-floor vehicle is illustrated in which the side of the operating rod 18 that is unevenly distributed from the center X of the operating rod mounting plate 20 (the rounded portion 20b) faces downward. In order to switch the operation rod 18 from the center X of the operation rod mounting plate 20 to the side (the rounded portion 20b) upward or downward, the operation rod mounting plates 20 of the two parallel link mechanisms 2 are replaced with each other. The mounting position of the operating rod 18 can be changed and set in two steps in the vertical direction according to the vehicle body floor height. This is because the timing of unlocking the safety lever 15 is switched between the low floor vehicle and the high floor vehicle so that the positional relationship of the loading platform 1 with respect to the ground G is substantially the same. When the loading platform 1 descends and approaches the ground G or contacts the ground, the operating rod 18 rotates the safety lever 15 by pressing the other end of the safety lever 15 from above to rotate the hooking portion 15a. It is configured to be released from the stopper 14 to release the locked state (see FIGS. 6, 9 and 12). 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. 10 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 in synchronization, and the loading platform 1 is in a horizontal posture at the vehicle body floor 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 posture as shown in FIG. 12, the two operation linkages 18 are moved below the lift arm 5 by the two parallel link mechanisms 2. Is lowered from above, and the other end sides of both safety levers 15 are pressed from above. 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. As shown in FIG. 13, it rotates around the connecting shaft 12 and is grounded in a forward tilting posture. 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. 12, 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 vehicle body floor surface height as shown in FIG. When the loading platform 1 moves away from the ground G or ascends to a predetermined height from the ground G, the two operating levers 18 are moved by the two sets of parallel link mechanisms 2 as the lift arms 5 are turned upward. The other end side of both safety levers 15 is pulled by the coil spring 16 and rotated upward, whereby the latching portion 15a is latched on the stopper 14 and is simultaneously locked, so that both safety levers 15 are restrained. Can not turn. 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. Also, when the loading platform 1 is raised to the vehicle body floor height as shown in FIG. 11 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. 11 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 this embodiment, since the latching portion 15a of the safety lever 15 only has to be hooked and detached with respect to the stopper 14, it is necessary to adopt a cam mechanism that requires high-precision machining or to make a major 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 this embodiment, by replacing the operation rod mounting plates 20 of the two sets of parallel link mechanisms 2 with each other, the mounting position of the operation rod 18 can be changed and set in two stages in the vertical direction. The timing of unlocking the low-floor vehicle and the high-floor vehicle with different levels can be switched by one operating rod mounting plate 20 so that the positional relationship of the loading platform 1 with respect to the ground G is substantially the same, and parts can be shared. be able to. Therefore, one cargo handling device A can be applied to a low-floor vehicle and a high-floor vehicle, and the cargo handling device A rich in versatility can be obtained.

  Further, in this embodiment, the end portions of the operating rod mounting plates 20 on the side where the screw holes 20a are not provided are detachably fitted into the fitting grooves 6a of the connecting shaft 6 and the end portions on the screw hole 20a side. Are detachably fastened with the bolts 21, so that the connecting shaft 6 can be prevented from rotating with a simple structure, and the operation of replacing the operating rod mounting plate 20 can be easily performed.

  In this embodiment, 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. In this case, the compression arm is pivotally attached to the base end of the loading platform 1 via the link.

  Further, in this embodiment, the operating rod mounting plate 20 is arranged so that the operating rod 18 faces the upper end of the safety lever 15 at the other end side (counter latching portion 15a side) on one end side of the lift arm 5 (tilt arm 4 side). Although attached to the lift arm 5, on the contrary, the operating rod 18 is attached so that it faces the lower side of the other end of the safety lever 15 (on the side of the counter hooking portion 15a), while the other end of the safety lever 15 (on the opposite side) A hook is attached to the lower surface of the latching portion 15a side, and when the loading platform 1 descends and approaches the ground or touches the ground, the operating lever 18 is engaged with the hook and the other end of the safety lever 15 is moved downward. The locking portion 15a may be released from the stopper 14 by releasing the locking portion 15a.

  Further, in this embodiment, the cargo handling apparatus 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 lifts a load when loading / unloading the load.

(A) is a side view immediately before the operating rod attached to the low-floor vehicle unlocks the safety lever, and (b) is a side view just before the operating rod attached to the high-floor vehicle unlocks the safety lever. . It is a disassembled perspective view before assembling the operating rod mounting plate to the connecting shaft of the lift arm for a low floor vehicle. The operating rod attachment plate attached to the vehicle width direction one side is shown, (a) is a front view, (b) is a right view of (a). The operating rod attachment plate attached to the vehicle width direction other side is shown, (a) is a rear view, (b) is a right view of (a). It is a perspective view of the body fixed side portion of the parallel link mechanism in the locked state in the low floor vehicle. It is a perspective view of the body fixed side portion of the parallel link mechanism in the unlocked state in the low floor vehicle. FIG. 6 is a plan view of FIG. 5. FIG. 6 is a side view of FIG. 5. FIG. 7 is a side view of FIG. 6. It is a side view which shows the storage state of the loading platform in a low floor vehicle. It is a side view which shows the state which has a loading platform in a vehicle body floor surface height in a low floor vehicle. It is a side view which shows the state which the loading platform contact | grounded in the horizontal attitude | position in the low floor vehicle. It is a side view which shows the state which inclined the loading platform front-end | tip in the low floor vehicle, and was earth | grounded.

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 Latching part 16 Coil spring (biasing means)
18 Operation rod 20 Operation rod mounting plate A Cargo handling device B1 Vehicle body floor B2 Support frame (vehicle body fixed side)
G Ground X Center of operation rod mounting plate

Claims (1)

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 one end near the top end of the tilt arm and the other end pivotally attached to the loading platform base 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 the tilt arms are configured so that when the loading platform is grounded in a horizontal posture, both 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 attached to each of the parts corresponding to the two parallel link mechanisms on the vehicle body fixing side,
A safety lever having a hook at one end is pivotally attached to the upper ends of both the tilt arms,
Both safety levers are urged by the urging means so that the latching portion is latched on the stopper,
An operating rod mounting plate is detachably attached to one end side of both lift arms,
When the loading platform descends and comes close to the ground or touches the ground, the operation rod that rotates the safety lever to disengage the latching portion from the stopper is attached to both the operation rod mounting plates. A vehicle loading / unloading device, wherein the loading and unloading device is protruded so that the mounting position can be changed in two steps in the vertical direction by exchanging the plates with each other.

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