JP5536422B2 - Cargo truck lifting device and truck equipped with the same - Google Patents

Description

    The present invention relates to a cargo platform loading / unloading apparatus for moving a cargo bed for loading and unloading cargo to a position where it is lowered to the rear of the host vehicle so that cargo can be easily loaded and cargo truck including the same. About.

As this type of freight vehicle, for example, a technique described in Patent Document 1 is known. In the technology described in this document, a lift frame that can be tilted rearward is provided on a chassis frame, and a load bed (body) that is guided by rollers and can slide on the lift frame is provided on the lift frame. Is provided.
This cargo bed is provided with a driving sprocket and idler at its front end, and a chain is wound around it. One end of the chain is fixed to the front end of the lift frame, and the other end is fixed to the rear end of the lift frame, and is stretched over the entire area of the lift frame. When the driving sprocket is driven by a hydraulic motor, the sprocket is caused to travel along the chain, and the loading platform slides over the entire lift frame. In particular, the lift frame has a bent portion that is bent obliquely downward on the rear end side thereof, and the load platform can be lowered substantially horizontally on the ground by lowering the load platform along the bent portion of the lift frame.

JP 05-338485 A

  However, in the technique described in Patent Document 1, since the loading platform is moved by the chain drive, there is a possibility that a malfunction may occur due to foreign matter such as pebbles biting into the chain. Further, since the chain is extended by use, it is necessary to perform maintenance frequently. Further, since this chain is stretched over the entire area of the lift frame, there is a possibility that the chain will break and break down. In addition, during driving, a relatively large operating noise is generated due to contact between the chain and the sprocket. Therefore, it may not be used in situations where quietness is required, such as a residential area at night.

Here, for example, when trying to move the loading platform using a plurality of hydraulic cylinders without using a chain, it is difficult to simply replace the drive portion by the chain in the document with a hydraulic cylinder.
This is because, in the case of driving by a chain, the carrier is tilted while sliding backward, and further, a complicated motion including a rotational motion of lowering the carrier to a substantially horizontal state on the ground is performed. However, when the chain is freely bent, it can follow the position of the fulcrum that moves according to the inclination due to the slide movement and rotation, whereas when a plurality of hydraulic cylinders are used, the fulcrum itself moves. This is because a plurality of hydraulic cylinders cannot be simply connected to each other.

  Moreover, since the hydraulic cylinder is accommodated under the loading platform when the loading platform is stored, the hydraulic cylinder must be accommodated within a length of the loading platform. Therefore, under such a constraint condition, the stroke of the hydraulic cylinder is naturally limited. In particular, in a loading platform elevating device with a specification that slides the loading platform to the position where it is lowered to the rear of the host vehicle, the amount of sliding movement is large (long). It was difficult to slide to the position where it was lowered backward.

  Therefore, the present invention has been made paying attention to such a problem, and even if it is a loading platform lifting device of a specification that slides the loading platform to the position where it is lowered to the rear of the host vehicle, An object of the present invention is to provide a cargo platform loading / unloading device capable of eliminating malfunctions and failures caused by use, simplifying maintenance, and reducing operating noise, and a cargo vehicle including the same. It is said.

In order to solve the above-mentioned problems, a first invention of the present invention is a cargo vehicle in which a cargo bed is lowered to the rear of the own vehicle and cargo is loaded, and the loaded cargo is stored and transported by storing the cargo bed. The front end of the loading platform is moved from the storage position where the loading platform is stored on the chassis frame to the rear in the front - rear direction of the host vehicle from the storage position where the loading platform is stored on the chassis frame using only two hydraulic cylinders. whole bed is a bed lifting apparatus comprising a moving mechanism for moving up Nokomi position lowered to a position where the ground and substantially horizontal, the movement mechanism is annexed along the vehicle longitudinal direction on the chassis frame guide supporting a rail, the loading platform over the entire range of movement of the vehicle front-rear direction of the tiltable and the loading platform to the movement and the vertical direction in the vehicle front-rear direction along the guide rail A movable frame for sliding along with itself, as the two hydraulic cylinders, and a front cylinder and the rear cylinder having a center trunnion structure portion is pivoted the middle of the tube, the guide rails, the The front end portion and the rear end portion are curved downward and are configured to have a front inclined portion, a horizontal portion, and a rear inclined portion in order from the vehicle front side, and the moving frame is separated in the vehicle front-rear direction. A pair of front rollers and a rear roller is provided, and the rear roller is positioned above the front roller in the up-down direction of the vehicle at the retracted position, and the pair of front rollers and rear rollers serve as the guide rail. along a slidable, said front cylinder, when its rod end is pivotally supported in front of the position of the chassis frame side In addition, the middle part of the tube is pivotally supported by the intermediate part of the moving frame, and the rear cylinder of the rear cylinder is pivotally supported by the rear part of the loading platform, and the middle part of the tube is moved by the movement. The front cylinder and the rear cylinder are shortened in the retracted position, and the moving frame is supported by the front inclined portion and the rear roller. A side roller is supported by the horizontal portion, and the moving frame is leveled on the chassis frame, and accordingly, the loading platform on the moving frame is leveled, The cylinder and the rear cylinder are extended, and the moving frame has the front roller supported by the horizontal portion and the rear roller at the rear inclined portion. The rear of the moving frame is supported and tilted rearward, and accordingly, the loading platform on the moving frame is lowered in the ground direction .

  According to the cargo platform lifting device of the first invention, the front cylinder and the rear cylinder have a center trunnion structure in which a middle portion of the tube is pivotally supported, and the front end of the front cylinder has a front end of the chassis frame. The middle part of the tube is pivotally supported by the middle part of the moving frame, and the rear cylinder is pivotally supported by the rear end of the loading platform, and the middle part of the tube is supported by the middle part of the moving frame. Since it is pivotally supported at the rear, the mechanism that moves the loading platform follows the tilting postures of multiple hydraulic cylinders even when the fulcrum moves in response to slide movement or rotation. A relatively large degree of freedom can be obtained.

  And by adopting a center trunnion structure that pivotally supports the middle part of the tube, it can be used as a rod stroke to the rear end of each tube of the front cylinder and the rear cylinder. Therefore, a movement amount (rod stroke) necessary for sliding the loading platform from the position stored on the chassis frame to the position where the loading platform is lowered to the rear of the host vehicle can be ensured. Therefore, it is possible to move the loading platform using a plurality of hydraulic cylinders without using a chain. And since the loading platform is moved using a plurality of hydraulic cylinders without using a chain, as described above, malfunctions and failures caused by using a chain can be eliminated, and maintenance can be simplified. In addition, the operating noise can be reduced.

In addition, the second invention of the present invention is a freight vehicle for lowering the loading platform to the rear of the host vehicle and loading the cargo, and storing the loaded cargo and transporting the loaded cargo, From the storage position in which the loading platform is stored on the chassis frame, the loading platform front end is moved to the rear in the vehicle front-rear direction rather than the rear end of the chassis frame, and the entire loading platform is moved to a boarding position where the loading platform is lowered to a position substantially horizontal with the ground There is provided a cargo bed lifting device having a movable mechanism, and the cargo bed lifting device according to the first invention is equipped as the cargo bed lifting device.

  According to the freight vehicle according to the second aspect of the invention, since the loading platform lifting device for the freight vehicle according to the first aspect is equipped, the loading platform is stored on the chassis frame using a hydraulic cylinder without using a chain. It can be slid from the position to a position lowered to the rear of the host vehicle. Therefore, it is possible to eliminate malfunctions and failures caused by the use of the chain, simplify maintenance, and further reduce operation noise.

  As described above, according to the present invention, a cargo bed lifting device for a cargo vehicle that can eliminate malfunctions and failures caused by using a chain, can simplify maintenance, and can further reduce operation noise. And a truck equipped with the same can be provided.

It is a side view of the vehicle transporter of one Embodiment of a lorry provided with the loading platform raising / lowering device for lorries concerning the present invention. The figure shows the storage position of the loading platform in the traveling state. It is the figure which decomposed | disassembled and showed the part of the moving mechanism of the loading platform raising / lowering apparatus of FIG. It is a cross-sectional view ((a)-(d)) of a loading platform raising and lowering device, the same figure (a) is a cross-sectional view of the A section in Drawing 1, and (b) is a cross-sectional view of the B section similarly below. , (C) is a cross-sectional view of part C, (d) is a cross-sectional view of part D. It is a figure ((a)-(f)) explaining operation | movement of the loading platform raising / lowering apparatus of 1st embodiment and a vehicle transporter provided with this, The figure (a) shows the slide movement initial stage attitude | position of a loading platform, (B) shows the initial tilted posture in which the moving frame is retracted, (c) shows the state in which the moving frame is further retracted, (d) shows the maximum slide moving posture of the loading platform, and (e) shows the moving (F) shows the boarding position where the moving frame is further retracted and the loading platform is inclined, and the loading platform is lowered to the ground behind the host vehicle. . It is the figure which showed typically the part of the loading platform raising / lowering apparatus of FIG. It is the figure which showed typically the part of the loading platform raising / lowering apparatus of the state of Fig.4 (a). It is the figure which showed typically the part of the loading platform raising / lowering apparatus of the state of FIG.4 (b). It is the figure which showed typically the part of the loading platform raising / lowering apparatus of the state of FIG.4 (c). It is the figure which showed typically the part of the loading platform raising / lowering apparatus of the state of FIG.4 (e). It is the figure which showed typically the part of the loading platform raising / lowering apparatus of the state of FIG.4 (f).

Hereinafter, a vehicle carrier according to an embodiment of a truck according to the present invention will be described with reference to the drawings as appropriate.
As shown in FIG. 1, the vehicle carrier 1 includes a loading platform 3 on a chassis frame 2. The loading platform 3 is integrally provided with a so-called torii 5 at the front thereof, and a rear turn 4 is provided at the rear of the loading platform 3. The rear turn 4 is attached so as to be rotatable in the front-rear direction of the host vehicle, and is in a vertical closed position shown in the figure and an open position (see FIG. f) can be positioned in each of the above).

  The loading platform 3 includes loading platform vertical joists 6 on both sides in the vehicle width direction. This load carrier vertical joist 6 is a long member in the shape of a channel steel, and is disposed so as to face the groove side of the channel steel inward in the width direction (see FIG. 3). At the bottom of the rear end of the loading platform 3, the loading platform 3 abuts the ground GL when the loading platform 3 is lowered to the rear of the host vehicle, and assists the movement in the sliding movement direction (also the front-rear direction of the host vehicle). A grounding roller 50 is provided. At the rear end of the chassis frame 2, a loading platform receiving roller 54 for supporting the loading platform 3 to be slid from below is attached.

  As shown in FIG. 1, the vehicle transport vehicle 1 is equipped with a loading platform elevating device 10 having a moving mechanism for the loading platform 3 between the loading platform 3 and the chassis frame 2. The platform lifting device 10 is moved by the moving mechanism so that the platform 3 is stored on the chassis frame 2 at the storage position K shown in the figure, and from the storage position K, the platform 3 is rearward of the host vehicle and abbreviated as the ground GL. It is configured to be slidable to a boarding position N (see FIG. 4F) lowered to a horizontal position. As a result, the vehicle transport vehicle 1 can load the vehicle on the loading platform 3 at the boarding position N and can transport the loaded vehicle with the loading platform 3 stored in the storage position K. In addition, if the loading platform grounding roller 50 is in a grounded state, the stacking itself is possible.

Hereinafter, the carrier lifting device 10 will be described in more detail. 2 is an exploded view of the part of the platform lifting device 10 of FIG. 1, and FIG. 3 is a cross-sectional view of each part (A to D) of the platform lifting device. FIG. 5 is a diagram schematically illustrating the moving mechanism in order to facilitate understanding.
As shown in FIGS. 2 and 5, the loading platform lifting device 10 has a guide rail 11 attached to the chassis frame 2, and the loading platform 3 is placed on the guide rail 11 via a moving frame 20. Then, the loading platform 3 or the moving frame 20 is moved according to the expansion and contraction of the two hydraulic cylinders of the front cylinder 30 and the rear cylinder 40, thereby the storage position K where the loading platform 3 is stored on the chassis frame 2 as described above. To the boarding position N where the loading platform 3 is lowered behind the host vehicle.

Specifically, a base frame 8 serving as a base for fixing the platform lifting device 10 is fixed on the chassis frame 2. The guide rail 11 is integrally connected to the base frame 8 and attached to the vehicle rear position on the chassis frame 2.
This guide rail 11 is a long guide member in the form of a grooved steel provided in a pair on both sides in the vehicle width direction, with the groove side of the grooved steel serving as the guide groove facing inward in the width direction. They are arranged opposite to each other (see FIG. 3). Each guide rail 11 is curved so that the front end portion and the rear end portion are directed downward, so that the side view is formed in a substantially “h” shape. The front inclined portion 12, the horizontal portion 14, the rear first inclined portion 16, and the rear second inclined portion 18 are configured in order from the front side.

  On the other hand, the moving frame 20 is formed in a substantially ladder-like (not shown) frame in plan view, and includes a pair of front rollers 21 and a rear roller 22 that are spaced apart in the vehicle front-rear direction on both sides of the rear portion. The pair of front roller 21 and rear roller 22 are slidably mounted on the guide rail 11. Here, the front roller 21 is provided on the front side of the vehicle in the sliding direction, and is attached to the tip of an arm portion that projects downward from the vehicle. On the other hand, the rear roller 22 is provided on the rear side of the vehicle in the sliding direction and, unlike the front roller 21, is directly attached to the moving frame 20 portion. Located above.

  The front roller 21 and the rear roller 22 protrude from the outer surface of the moving frame 20 toward the outside in the width direction, and can be rotated around the axis via a support shaft that faces the vehicle width direction. Then, as shown in FIGS. 3B and 3C, the front roller 21 and the rear roller 22 are fitted into the substantially U-shaped grooves of the pair of guide rails 11 described above to roll. The sliding movement of the moving frame 20 is smoothly guided along the guide rail 11.

  Here, as shown in FIG. 2, at the storage position K, the front roller 21 is located on the front inclined portion 12 of the guide rail 11, and the rear roller 22 is located on the horizontal portion 14 of the guide rail 11. Therefore, in the storage position K, the moving frame 20 is substantially horizontal, and the posture of the loading platform 3 is also supported horizontally. Then, as will become clearer in the description of the operation described later, the front roller 21 and the rear roller 22 slide along the shapes of the inclined portions 12, 14, 16 and 18 of the guide rail 11 described above. Thus, the loading platform 3 on the moving frame 20 can be supported by moving and tilting the loading platform 3 so as to be lowered to the height required for lowering the loading platform 3 so that the loading platform 3 can be lowered substantially horizontally on the ground. ing.

  The moving frame 20 has a pair of moving frame rails 24 fixed to both sides in the vehicle width direction. Each moving frame rail 24 is also a long guide member made of channel steel, and as shown in FIG. 2 and FIG. 3A, the loading platform front side rollers 52 provided on both front sides of the loading platform 3 can roll. The sliding movement of the loading platform 3 is smoothly guided along the moving frame rail 24.

Further, the loading platform elevating device 10 includes a front cylinder 30 and a rear cylinder 40 as a drive mechanism for sliding the moving frame 20 and the loading platform 3 described above.
Here, the front cylinder 30 and the rear cylinder 40 have a center trunnion structure in which a middle portion of the tube is pivotally supported. The front cylinder 30 has a rod 32 whose tip is pivotally supported by the front portion 8a of the chassis frame 2, and a middle portion 36 of the tube 34 is an intermediate portion 20b of the moving frame 20 (in this example, the front roller described above). 21 is pivotally supported on the base end portion of the arm portion that projects 21. The rear cylinder 40 has a rod 42 whose tip is pivotally supported by the rear portion 3a of the loading platform 3 (in the vicinity of the loading platform grounding roller 52 in this example), and an intermediate portion 46 of the tube 44 is formed by the rear portion 20a of the moving frame 20. It is pivotally supported by.

Next, operation | movement of the said carrier lifting apparatus 10 and the vehicle transport vehicle 1 provided with this, an effect | action, and an effect are demonstrated, referring FIG.4 (a)-(f), FIGS. 6 to 10 schematically show a part of the platform lifting device 10 in a deformed manner in order to facilitate understanding of the operation of the slide moving mechanism of the platform lifting device 10.
When the vehicle carrier 1 is in a traveling state, the loading platform 3 is in the storage position K stored on the chassis frame 2 as shown in FIGS. And when this vehicle carrier 1 lowers the loading platform 3 to the back of the own vehicle and loads other vehicles as cargo, for example, as shown in FIG. 4 (a) and FIG. Then, the rear cylinder 40 is driven to extend the rod 42 by a predetermined amount (reference S1 in FIG. 6). As a result, the loading platform 3 is guided while the loading platform front roller 52 rolls along the moving frame rail 24 of the moving frame 20, and slides backward to the host vehicle (reference numeral M1 in FIG. 6).

  Next, as shown in FIGS. 4B and 7, the front cylinder 30 is extended by a predetermined amount (reference S2 in FIG. 7). Thereby, the front roller 21 and the rear roller 22 of the moving frame 20 start to slide along the guide rail 11 by pushing the moving frame 20 rearward through the pivotal support portion 36 of the tube 34 of the front cylinder 30. To do. At this time, since the front roller 21 is supported by the front inclined portion 12, the front side of the moving frame 20 is lifted upward as it moves rearward. On the other hand, since the rear roller 22 is supported by the horizontal portion 14, the rear side of the moving frame 20 moves horizontally with the original height. As a result, the front of the moving frame 20 is lifted and inclined, and accordingly, the loading platform 3 on the moving frame 20 also starts to tilt backward.

  Next, the front roller 21 of the moving frame 20 moves from the front inclined portion 12 to the horizontal portion 14 as it moves rearward, so that it is supported by the horizontal portion 14. Therefore, as shown in FIG. 4C, the entire moving frame 20 is slid horizontally to the rear of the host vehicle while maintaining the initial inclination, and the cargo bed 3 also moves further rearwardly. The rear end of the loading platform 3 is supported by grounding to the ground GL. The middle part of the loading platform is supported by the loading platform receiving roller 54 (see FIGS. 1 and 2).

Next, as shown in FIGS. 4D and 8, the rear cylinder 40 is driven to fully extend the rod 42 (reference S3 in FIG. 8). As a result, the loading platform front roller 52 is guided while rolling along the moving frame rails 24 on both sides of the moving frame 20, and the loading platform 3 slides backward while grounding the loading platform grounding roller 50 to the ground GL ( Symbol M3 in FIG. 6).
Here, according to the loading platform lifting device of the vehicle transporter 1, as can be seen from FIG. 8 schematically shown, a center trunnion structure is adopted as the rear cylinder 40, and the tip of the rod 42 is the loading platform 3. Since the pivot part 46 of the tube 44 is pivotally supported by the rear part 20a of the moving frame 20 while being pivotally supported by the rear part 3a, the movement is such that the fulcrum moves in accordance with the slide movement and rotation as described above. However, the degree of freedom of following the tilting posture of the rear cylinder 40 with respect to the movement can be relatively large. Further, since the rear end of the tube 44 protrudes from the pivot 46 of the tube 44 of the rear cylinder 40, the rod stroke can be used up to the rear end of the tube 44. Therefore, it is possible to secure a movement amount (rod stroke) necessary for sliding the loading platform 3 from the position stored on the chassis frame 2 to the position lowered to the rear of the host vehicle shown in FIG.

  Next, as shown in FIGS. 4E and 9, the front cylinder 30 is extended (reference S4 in FIG. 9). Thus, the front roller 21 and the rear roller 22 of the moving frame 20 slide along the guide rail 11 to the rear of the vehicle by pushing the moving frame 20 rearward through the pivotal support portion 36 of the tube 34 of the front cylinder 30. To do. At this time, the front roller 21 is horizontally supported because it is supported by the horizontal portion 14. On the other hand, since the rear roller 22 is supported by moving from the horizontal portion 14 to the rear first inclined portion 16, the rear side of the moving frame 20 gradually tilts rearward as it moves rearward (reference numeral M4 in FIG. 9). . As a result, the rear of the moving frame 20 as a whole is further tilted rearward downward, and accordingly, the loading platform 3 on the moving frame 20 is lowered in the ground GL direction (reference numeral D1 in FIG. 9).

  Next, as shown in FIG. 4 (f) and FIG. 10, the front cylinder 30 is further extended (reference S4 in FIG. 9). Accordingly, the front roller 21 and the rear roller 22 of the moving frame 20 are further slid along the guide rail 11 by pushing the moving frame 20 further rearward through the pivotal support portion 36 of the tube 34 of the front cylinder 30. . At this time, the front roller 21 moves horizontally because it is supported by the horizontal portion 14. On the other hand, the rear roller 22 shifts from the rear first inclined portion 16 to the rear second inclined portion 18 having a greater degree of rearward inclination, so that the rear side of the moving frame 20 is further rearwardly inclined as it moves rearward. (Symbol M5 in FIG. 10). As a result, the rear of the moving frame 20 as a whole is further tilted rearward downward, and accordingly, the loading platform 3 on the moving frame 20 is further lowered in the direction of the ground GL so that the moving frame 20 is placed almost horizontally with respect to the ground GL. It can be located at the insertion position N (reference numeral D2 in FIG. 10).

  Here, according to the loading platform elevating device of the vehicle transport vehicle 1, as can be seen from FIG. 10 schematically shown, a center trunnion structure is adopted as the front cylinder 30, and the tip of the rod 32 is in front of the chassis frame 2. Since the middle part 36 of the tube 34 is pivotally supported by the intermediate part 20b of the moving frame 20 while being pivotally supported by the part 8a, the fulcrum of the front cylinder 30 also moves according to the slide movement and rotation. Even for such a movement, a relatively large degree of freedom for allowing the tilting posture of the front cylinder 30 to follow the movement is obtained. Further, since the rear end of the tube 34 projects beyond the pivotal support portion 36 of the tube 34 of the front cylinder 30, it can be used as a rod stroke up to the rear end of the tube 34. Therefore, it is possible to secure a movement amount (rod stroke) necessary for sliding the loading platform 3 from the position stored on the chassis frame 2 to the position lowered to the rear of the host vehicle shown in FIG.

  As described above, according to the loading platform elevating device 10 of the vehicle transport vehicle 1, the front cylinder 30 and the rear cylinder 40 are centered on the middle portions of the tubes 34, 44 (the pivot portions 36, 46). The front cylinder 30 has a trunnion structure, and the front end of the rod 32 is pivotally supported by the front portion 8a of the chassis frame 2, and the pivotally supported portion 36 of the tube 34 is pivotally supported by the intermediate portion 20b of the moving frame 20. In the rear cylinder 40, the tip of the rod 42 is pivotally supported by the rear portion 3a of the loading platform 3, and the pivotal support portion 46 of the tube 44 is pivotally supported by the rear end portion 20a of the 20, so that the loading platform 3 is moved. Even when the mechanism moves in such a way that the fulcrum moves in response to slide movement or rotation, the tilting postures of the front cylinder 30 and the rear cylinder 40 are adjusted with respect to the movement. Increase resulting flexibility to follow relatively.

  And, by adopting a center trunnion structure that pivotally supports the middle portions of the tubes 34 and 44 (the pivotal support portions 36 and 46), the rear end of each tube 34 and 44 can be used as a rod stroke. The amount of movement (rod stroke) required for sliding the vehicle from the storage position K stored above 2 to the boarding position N lowered to the rear of the host vehicle can be ensured.

Therefore, it is possible to move the loading platform 3 using a plurality of hydraulic cylinders (the front cylinder 30 and the rear cylinder 40) without using a chain like the technique described in Patent Document 1 exemplified above. And since the loading platform is moved using a plurality of hydraulic cylinders without using a chain, as described above, malfunctions and failures caused by using a chain can be eliminated, and maintenance can be simplified. In addition, the operating noise can be reduced.
It should be noted that the cargo platform lifting device and the cargo vehicle including the same according to the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. is there.

1 Vehicle carrier (lorry)
DESCRIPTION OF SYMBOLS 2 Chassis frame 3 Cargo bed 4 Back roll 5 Torii 6 Car bed vertical joist 8 Base frame 10 Cargo lift device 11 Guide rail 12 Front inclined part 14 Horizontal part 16 Back first inclined part 18 Back second inclined part 20 Moving frame 21 Front roller 22 Rear roller 24 Moving frame rail 30 Front cylinder 32 Rod 34 Tube 36 Pivot 40 Rear cylinder 42 Rod 44 Tube 46 Pivot 50 Loading platform grounding roller 52 Loading platform front roller 54 Loading platform receiving roller

Claims (2)

The cargo bed is lowered to the back of the host vehicle and loaded with cargo, and the loaded cargo is used in a lorry that stores and transports the cargo bed, and the hydraulic cylinder is limited to two hydraulic cylinders. From the stowed position in which the loading platform is stored on the chassis frame, the loading platform front end is moved to the rear in the front-rear direction of the host vehicle from the rear end of the chassis frame to the boarding position where the entire loading platform is lowered to a position that is substantially horizontal with the ground. A loading platform lifting device including a moving mechanism for causing
Said moving mechanism, said a chassis frame guide rails that are attached along the longitudinal direction of the vehicle on its guide rails along the in tiltable movement and vertically to the vehicle longitudinal direction and the loading platform vehicle longitudinal direction A front frame and a rear cylinder having a center trunnion structure in which a middle portion of the tube is pivotally supported as the two hydraulic cylinders, a moving frame that slides along the self while supporting the loading platform over the entire moving range A cylinder,
The guide rail has a front inclined portion, a horizontal portion, and a rear inclined portion, which are curved from the front side of the vehicle in order to bend downward with the front end portion and the rear end portion thereof downward.
The moving frame includes a pair of front and rear rollers spaced apart in the vehicle front-rear direction, and the rear roller is located above the front roller in the vehicle vertical direction at the retracted position. The front roller and the rear roller can slide along the guide rail,
The front cylinder has a rod end pivotally supported at a front position on the chassis frame side, and a middle portion of the tube is pivotally supported on an intermediate portion of the moving frame. The front end is pivotally supported by the rear part of the loading platform, and the middle part of the tube is pivotally supported by the rear end part of the moving frame ,
In the retracted position, the front cylinder and the rear cylinder are shortened, and the moving frame is moved with the front roller supported by the front inclined portion and the rear roller supported by the horizontal portion. A frame is leveled on the chassis frame, and accordingly, the loading platform on the moving frame is leveled;
In the boarding position, the front cylinder and the rear cylinder are extended, and the moving frame has the front roller supported by the horizontal portion and the rear roller supported by the rear inclined portion. A cargo platform lifting apparatus for a cargo vehicle , wherein the rear of the moving frame is tilted rearward downward, and accordingly, the loading platform on the moving frame is lowered in the ground direction . A cargo vehicle for lowering the loading platform to the rear of the vehicle and loading cargo, and storing the loaded cargo in the loading platform,
From the stowed position in which the cargo bed is stored on the chassis frame to the boarding position in which the front edge of the cargo bed is moved to the rear in the vehicle front-rear direction rather than the rear edge of the chassis frame and the entire cargo bed is lowered to a position that is substantially horizontal with the ground A truck equipped with a platform lifting device having a movable moving mechanism, and equipped with the platform lifting device for a truck according to claim 1 as the platform lifting apparatus.

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