JPH0586680U - Lift equipment for lorries - Google Patents

Abstract

(57) [Abstract] [Purpose] A lift device automatically stored in the underfloor is automatically tilted by mechanical means with a simple structure. [Structure] A lift table 5 that can be expanded and folded is provided in the packing box 2. The loading box 2 is provided with a guide rail 17 of a guide roller 16 provided on the lift table 5 to form a rising mechanism 22. On the lift table 5, the link arms 23 and 23A that serve as the grounding member 25 are pivotally supported. This one side link arm
A weight 30 serving as an urging member is attached to 23 via a connecting arm 31. Engagement roller at the tip of the other link arm 23A
The lift table 5 is provided with an engagement groove 27 that engages with the engagement roller 26. The engagement groove 27 is provided with a continuous groove 28 and a relief groove 29 that form a lock release mechanism. [Effect] The lift table 5 raises the mechanism 22 and the grounding member.
Tilted in the deploying direction by the grounded state by 25.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lift device for a freight vehicle, and more particularly to a lift device for a freight vehicle that automatically deploys the lift table in conjunction with the lowering operation of the lift table.

[0002]

[Prior Art]

 In the past, this type of lifting device stored the lift table in parallel with the floor surface as much as possible because it was necessary to store the folded lift table in the limited space under the floor. By storing the lift table in parallel with the floor surface in this way, the lift table can be stored compactly under the floor, but when lowering the stored lift table to deploy it, It is necessary to manually lift and rotate the lift table stored in a horizontal state, and the work of raising the lift table is not possible for the worker because the lift table is stored behind the floor. I had to lift from my posture and it was hard work.

Therefore, in order to solve such a problem, in Japanese Utility Model Laid-Open No. 57-150038, when a lift table is stored in a standing state behind a packing box and the lift table is lowered and used, There has been proposed a vehicle lifter folding device configured to be deployed by a hydraulic cylinder.

[0004]

[Problems to be solved by the device]

 In the above-mentioned conventional example, although the lift table folded in half by the hydraulic cylinder can be expanded and folded as well, the structure is complicated due to the use of the hydraulic cylinder, and the hydraulic circuit for controlling the hydraulic cylinder is used. Is also required, which causes an increase in manufacturing cost. Furthermore, since the conventional lift device is stored in an upright position so as to block the loading / unloading port at the rear of the cargo box when the lift table is stowed, the lift table must be lowered each time the luggage is taken in and out. However, even when loading or unloading a small piece of luggage that does not require a lift table, the lift table needs to be operated to interfere with the lift table, which is not only inefficient but also difficult to work with. is there.

Therefore, the present invention has been made based on such a problem, and in a lift device stored under the floor, the lift table is automatically moved in the lift table developing direction by a mechanical means having a simple structure. The purpose is to provide a lifting device for a lorry that can tilt.

[0006]

[Means for Solving the Problems]

 The present invention relates to a lift device for a freight vehicle, wherein a lift table that can be expanded and folded in a packing box is provided so as to be able to move up and down, and the lifting table is folded and stored under a floor of the packing box in a substantially horizontal state. The table rising mechanism that raises the lift table in the horizontal storage state in conjunction with the descending motion of the table, and the table that is detachably attached to the lift table and that projects downward from at least the lift table in the standing state by the biasing member. The lift table includes a grounding member that tilts the lift table and a lock release mechanism that releases the engagement between the grounding member and the lift table when the lift table is in the grounded expanded state.

[0007]

[Action]

 According to the present invention, with the above configuration, when the lift table in the horizontal storage state is lowered, the lift table is rotated from the horizontal state to the standing state by the table raising mechanism while the lift table is being lowered, and the lift table is grounded. During this period, the lift table is rotated by the grounding member that comes into contact with the lift table by the biasing member, and the lift table, which is erected by the table raising mechanism, is automatically tilted in the deploying direction. When the lift table is unfolded, the lock release mechanism releases the engagement between the lift table and the grounding member.When the lift table is used, when the lift table is raised and the lift table is grounded again, the lift table is lifted by the grounding member. The bull is never rotated.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 6 show a first embodiment of the present invention, in which an aluminum van type cargo box 2 fixed on a freight vehicle chassis frame 1 has a rear surface opened to form a luggage entrance / exit 3. This is a conventionally known packing box structure in which the doorway 3 is opened and closed by a double door opening / closing door 4 attached to the rear ends of the left and right side walls of the packing box 2. A lift table 5 is provided at the rear of the packing box 2. The lift table 5 is composed of a front table 6 and a rear table 7, and the lift table 5 is grounded at the rear end of the table 7. At this time, an inclined plate 8 is provided which eliminates the step between the rear table 7 and the ground contact surface and facilitates the entry of a trolley, etc., and the end portions of the tables 6 and 7 and the inclined plate 8 are pivotally connected by a pivot 9. The tables 6 and 7 and the inclined plate 8 are connected so that they can be folded and developed. Further, a pair of left and right lifting posts 10 are provided upright on both front side portions of the front table 6, and the lifting posts 10 and the front table 6 are pivotally attached by a pivot shaft 10A. The elevating post 10 and the front table 6 are regulated by a stopper mechanism (not shown) in a state in which the front table 6 is in a horizontal state and further rotation. That is, when the front table 6 is unfolded to the rear of the luggage box 2, the front table 6 is held vertically to the lifting posts 10.

On both sides of the inner surface of the entrance / exit 3 of the cargo box 2, hollow square tubular guide columns 11 for guiding the respective elevating posts 10 are formed, and the lower ends of the guide columns 11 are inside the chassis frame 1. Is located below the floor surface 2A, and vertical grooves 12 are formed inwardly at the lower ends of the extended guide columns 11. A plurality of guide rollers 13 rolling along the elevating posts 10 are rotatably supported in the guide columns 11, and the elevating posts 10 guided by the guide columns 11 by the guide rollers 13. The lifting post 10 that is stably guided in this way is connected to the piston rod 15 of the hydraulic cylinder 14 provided in the upper part of the guide column 11 and hung up. It is configured to move up and down. On the front side of the rear table 7, a pair of left and right guide rollers 16 are rotatably supported so as to project laterally from both sides of the rear table 8, and inside the guide column 11, the guide rollers 16 are provided. A pair of left and right guide rails 17 for receiving the rollers 16 are horizontally provided. This guide rail 17 is a lower guide plate 19 that is substantially horizontal with the side plate 18, and an upper guide plate 21 that extends the rear opening 20 of the guide rail 17 that inclines the rear side upward and receives the guide roller 16 as an inlet. When the lift table 5 is rotated to the packing box side with the pivot 10A as a fulcrum in a state in which the rear tebul 7 is folded on the front tebul 6, the rotation locus of the guide roller 16 provided on the rear tebul 7 is formed. The rear opening 20 of the guide rail 17 is formed so as to face the above. The guide roller 16 and the guide rail 17 constitute a table raising mechanism 22 of the lift table 5, and when the lift table 5 is stored, the guide roller 16 and the guide rail 17 are engaged with each other to interlock with the lift of the lift table 5. When guiding the lift table 5 horizontally along the floor surface 2A and lowering the lift table 5 in the opposite direction, make sure that the lift table 5 in the horizontal storage state stands up with the storage table 2 slightly inclined. To guide you. Further, the lift table 5 is equipped with a grounding member 25 configured by pivotally connecting the ends of two link arms 23, 23A having different lengths by a shaft 24, and the base end side of the short link arm 23 is attached. Are located on both sides of the front end of the front table 6 and are pivotally supported on the pivot shaft 10A, while an engagement roller 26 is rotatably supported on the proximal end side of the long link arm 23A. Are engaged with engagement grooves 27 provided on both sides of the front end of the front table 6. A clearance groove 29 is formed in the engagement groove 27 so as to be longer than the engagement groove 27 through a continuous groove 28, and is parallel to the engagement groove 27. The clearance groove 29 and the clearance groove 29 are continuous with each other. Constitutes an unlocking mechanism. On the base end side of the link arm 23, a weight 30, which is a biasing member for projecting the link arms 23 and 23A downward from the lift table troller 26 in the upright state, is integrally formed via a connecting arm 31. It is provided. A shock absorber 32 is provided substantially in the center on the back side of the front table 6, and the base side of the shock absorber 32 is pivotally attached to a mounting bracket 33 integrally provided with the pivot 10A, and is provided at the tip of the rod. The shaft 34 is loosely inserted into a long hole 35 formed in the front table 6 to connect the front table 6 and the pivot shaft 10A. In this case, the shaft 34 provided at the tip of the rod rolls along the long hole 35 while the front table 6 is in the horizontal storage state and is in the standing state by the table raising mechanism 5 and the grounding member 25, and thereafter. The shaft 34 is locked to the end of the long hole 35 until the front table 6 in the upright state is rotated to move to the grounded state so that the shock absorbing action of the shock absorber 32 is transmitted to the front table 6. ing.

The operation of the present invention configured as above will be described.

First, when carrying out a cargo handling operation, as shown in FIG. 2A, the lift table 5 which is folded and stored in the underfloor 2A is lowered by the hydraulic cylinder 14 via the lifting post 10. At this time, as the lift table 5 descends, the side of the pivot 10A connected to the elevating post 10 descends, while on the free end side of the lift table 5, the guide roller 16 which is a table raising mechanism 22 is attached to the guide rail 17. Along the rear side of the luggage box 2, the lift table 5 stands up from a horizontal state to a state in which it is slightly inclined to the luggage box 2 side. Further, in the retracted state of the lift table 5 shown in FIG. 2A, the engagement roller 26 is engaged with the escape groove 29. When the lift table 5 is tilted by the above-described raising mechanism 22 from this state, the engagement roller 26 is biased counterclockwise by the weight 30 and a rotational force directed downward is applied, and as shown in FIG. When the engagement groove 27 becomes horizontal by the rotation of the front table 6 by the hydraulic cylinder 14, that is, when the continuous groove 28 becomes vertical, the engagement roller 26 that is locked to the escape groove 29 side by the urging force of the weight 30 is connected. Groove 2
8 is engaged with the lower end of the engaging groove 27, and the link arms 23 and 23A, which are grounding members 25, are bent in a dogleg shape as shown in FIG. Make it protrude downward. Then, when the lift table 5 is lowered in this state, as shown in FIG. 2 (B), the pivotally supporting portions of the preceding link arms 23 and 23A come into contact with the ground surface A, and the engaging roller 26 is fitted into the engaging groove 27. It rolls along and abuts on the edge of the engaging groove 27. Until the raising / lowering post 10 comes into contact with the ground, the lift tables 5 are rotated by the link arms 23, 23A in the unfolding direction thereof, that is, in the rear side of the packing box 2, and the table raising mechanism 22 slightly moves the lift tables 5. By further rotating the lift table 5 tilted to the packing box side and standing up, when the lift table 5 is unfolded, the operator can unfold each table 5, 6 in a comfortable posture and ground it. Therefore, it is possible to reduce the labor in developing each table 5, 6, and in the present embodiment, when each table 5, 6 is expanded and each table 5, 6 is grounded, The shock absorber 32 installed between the pivot shaft 10A and the shock absorber 32 does not cause the front table 6 to fall suddenly, but the front table 6 can be grounded with a light force and can be erected from the horizontal storage state. During this state, the shaft 34 provided at the tip of the rod rolls along the long hole 35, so that the shock absorbing effect of the shock absorber 32 is not transmitted to the front table 6 and the front table 6 is smoothly moved to the standing state. can do. It should be noted that the mounting arm 31 provided integrally with the link arm 23 by the movement of the link arm 23, 23A from the time when the shaft supporting portion of the link arm 23, 23A contacts the ground surface A until the lifting post 10 contacts the ground. Is rotated, and the rotational biasing force of the engagement roller 26 by the weight 30 is switched from the counterclockwise direction to the clockwise direction by the positional relationship between the weight 30 of the mounting arm 31 and the pivot 10A. Then, when the table 6 is grounded with the pivot 10A as a fulcrum, as shown in FIG. 5 (A), as described above, from the initial rotating state of the front table 6 until the mounting arm 31 of the weight 30 is grounded. Rotational force in the clockwise direction is applied to the engagement roller 26 by 30 and the engagement roller 26 is held by abutting against the end of the engagement groove 27. However, when the mounting arm 31 of the weight 30 is grounded, the rotation of each link arm 23, 23A by the weight 30 is regulated. Therefore, as shown in FIG. The combining roller 26 slides along the engaging groove 27 toward the continuous groove 28, and when the engaging roller 26 is inserted into the continuous groove 28, the engaging roller 26 escapes due to its own weight of the link arm 23. It falls into 29 and switches to the escape groove 29 side, and in this state, even if each link arm 23, 23A projects above the lift table 5 and lifts the lift table 5 and lifts the lift table 5 and again touches the ground. Only when the engaging roller 26 rolls along the escape groove 29, the lift table 5 is not rotated by each link arm 23, 23A as when the lift table 5 is lowered.

Next, when the lift table 5 is folded and stored in the underfloor 2A, the inclined plate 8 and the rear table 7 are sequentially folded on the front table 6 as shown in FIG. On the contrary, the front table 6 is rotated around the pivot 10A as a fulcrum toward the packing box 2 side to guide the guide rollers 16 provided on the front table 6 to the guide rails 17, and thereafter, the lift table 5 is lifted to lift the lift table. 5 is stored horizontally under the floor 2A.

As described above, according to the present invention, when the tables 6 and 7 are unfolded to the rear of the packing box 2 during loading and unloading, the table raising mechanism 22 and the grounding member 25 automatically interlock with the lowering of the lift table 5. Therefore, the lift table 5 can be tilted to the operator side to stand up, and it is not necessary to raise the lift table 5 stored horizontally in the back side of the underfloor 2A, which reduces the labor of the worker. Moreover, when the lift table 5 in the upright state is grounded, the shock absorber 32 installed between the front table 6 and the pivot 10A does not cause the front table 6 to suddenly fall down with a light force. The front table 6 can be grounded. In addition, the lift table 5 can be automatically tilted to the operator side and raised by a mechanical means having a simple structure without using a special driving means such as a hydraulic cylinder as in the conventional example.

7 to 9 show a second embodiment of the present invention. The same parts as those of the first embodiment are designated by the same reference numerals and the detailed description thereof will be omitted.

In this embodiment, the lift table 5 is attached to the luggage box 2 via the left and right upper arms 40 and the left and right lower arms 41, and the table raising mechanism 42 is pivoted on a pivot 40A between the upper arm 40 and the lift table 5. The pressing lever 44 to be worn, the pressing roller 45 rotatably supported on the tip end side of the pressing lever 44, and the pressing roller 45 formed on the receiving plate 46 provided between the left and right lower arms 41. And a guide plate 46 for mounting the. Then, as in the first embodiment, a grounding member 25 is provided, which is constructed by pivotally connecting the ends of two link arms 23, 23A having different lengths by a shaft 24. The base end side is pivotally supported on the pivot 40A of the left and right upper arms 40, while the engagement roller 26 pivotally supported on the base end side of the long link arm 23A is engaged in the engagement grooves 27 provided on both sides of the front end of the front table 6. Engaged. Similar to the first embodiment, the engaging groove 27 is provided with a continuous groove 28, which is a lock releasing mechanism, and a relief groove 29, which is longer than the engaging groove 27. Further, in this embodiment, the link arm 23, 23A is always biased counterclockwise on the pivot 40A of the link arm 23 so that the link arms 23, 23A project below the lift table 5. The spring 47 is attached.

When carrying out the cargo handling work, the lift table 5 folded and stored in the underfloor 2A is lowered by the extension of the hydraulic cylinder 14 via the left and right upper arms 40 and the left and right lower arms 41. At this time, as shown in FIG. 7, as the lift table 5 descends, the pressing roller 45 that constitutes the table raising mechanism 42 and the guide plate 47 on the receiving plate 46 engage with each other, and the pressing contact is performed. The lift table 5 is pushed up to a substantially upright state by the pressing lever 44 via the roller 45. In this case, in the retracted state of the lift table 5, the engagement roller 26 is engaged with the escape groove 29 as in the first embodiment. From this state, when the lift table 5 is lowered by the table raising mechanism 42 described above, the engaging roller 26 is engaged with the engaging groove 27 side by the winding spring 47 via the continuous groove 28. After that, the lift table 5 is lowered to ground the shaft supporting portions of the preceding link arms 23 and 23A, and the lift table 5 is further rotated by the respective link arms 23 and 23A. When the lift table 5 contacts the ground, the link arm 23A is restricted from rotating by grounding as shown in FIG. 10. In this state, when the lift table 5 is unfolded and grounded, the engagement roller 26 moves into the engagement groove 27. When it rolls along and reaches the continuous groove 28, the engaging roller 26 that falls into the escape groove 29 by its own weight of the link arm 23 and engages with the engagement groove 27 when the lift table 5 descends Engage with. Therefore, when the lift table 5 is used in the same manner as in the first embodiment, even if the lift table 5 is lifted and grounded again, the grounding engagement roller 26 only rolls along the escape groove 29. The lift table 5 is not rotated by the arms 23 and 23A.

As described above, in this embodiment, when the tables 6 and 7 are unfolded to the rear of the cargo box 2 during cargo handling, the raising mechanism 42 and the grounding member 25 automatically interlock with the lowering of the lift table 5. By tilting the lift table 5 toward the operator and standing up, the labor of the operator involved in the work of deploying the lift table 5 can be reduced as in the first embodiment.

The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the present invention. For example, although an example is shown in which an entrance is formed on the rear surface of the packing box, this entrance may be set according to the purpose of use such as forming an entrance on the left side wall or the right side wall or the side wall surface and the rear surface thereof. Further, the opening / closing door for opening / closing the entrance / exit is not limited to the double door type opening / closing door but can be applied to various types such as strut type and upper / lower folding door type. Further, an example in which a hydraulic cylinder is used as the lifting device in the first embodiment and is directly attached to the lifting post of the lift table has been shown. However, the lifting post is hung via a connecting member such as a chain, and the hydraulic cylinder is used. The lift table may be moved up and down via a connecting member by various cylinder devices such as an air cylinder and an air cylinder. Further, the structure of the elevating device, such as winding the connecting member with an electric winch to elevate the lift table, may be set as appropriate. Further, although the lift table is shown as being divided into two parts, the lift table may be divided into three parts or three or more parts. Further, the biasing member made up of the weight or the like of the first embodiment is applied to the second embodiment, or conversely, the biasing member made up of the winding spring or the like of the second embodiment is applied to the first embodiment. It may be applied.

[0020]

[Effect of the device]

 The present invention relates to a lift device for a freight vehicle, wherein a lift table that can be expanded and folded in a packing box is provided so as to be able to move up and down, and the lifting table is folded and stored under a floor of the packing box in a substantially horizontal state. The table rising mechanism that raises the lift table in the horizontal storage state in conjunction with the descending motion of the table, and the table that is detachably attached to the lift table and that projects downward from at least the lift table in the standing state by the biasing member. By being equipped with a grounding member that tilts the lift table in the upright state and a lock releasing mechanism that releases the engagement between the grounding member and the lift table when the lift table is in the grounded deployed state, it is stored under the floor. In the lifting device, the lift table can be automatically tilted in the direction of deployment of the lift table by mechanical means having a simple structure. It is possible to provide a lifting device of the truck that can.

[Submission date] June 24, 1992

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

[Means for Solving the Problems]

The present invention relates to a lift device for a freight vehicle, wherein a lift table that can be expanded and folded in a packing box is provided so as to be able to move up and down, and the lifting table is folded and stored under a floor of the packing box in a substantially horizontal state. The table rising mechanism that raises the lift table in the horizontal storage state in conjunction with the descending motion of the table, and the table that is detachably attached to the lift table and that projects downward from at least the lift table in the standing state by the biasing member. The lift table includes a grounding member that tilts the lift table and a lock release mechanism that releases the engagement between the grounding member and the lift table when the lift table is in the grounded expanded state. Further, the present invention is only set to be vertically movable to deploy and foldable lifting table packing box, the lifting device of freight vehicles for storing in a substantially horizontal state under the floor of the cargo box by folding the lifting table, the detachably mounted to the lift table, and a grounding member for tilting the lift table projects downward from the lifting table by a biasing member, and the ground member and the lifting table at the ground expanded state of the lift table And a lock releasing mechanism for releasing the engagement.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0019

[Correction method] Change

[Correction content]

The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the present invention. For example, although an example is shown in which an entrance is formed on the rear surface of the packing box, this entrance may be set according to the purpose of use such as forming an entrance on the left side wall or the right side wall or the side wall surface and the rear surface thereof. Further, the opening / closing door for opening / closing the entrance / exit is not limited to the double door type opening / closing door, but can be applied to various types such as strut type and upper / lower folding door type. Further, an example in which a hydraulic cylinder is used as the lifting device in the first embodiment and is directly attached to the lifting post of the lift table has been shown. However, the lifting post is hung via a connecting member such as a chain, and the hydraulic cylinder is used. The lift table may be moved up and down via a connecting member by various cylinder devices such as an air cylinder and an air cylinder. Further, the structure of the elevating device, such as winding the connecting member with an electric winch to elevate the lift table, may be set as appropriate. Further, although the lift table is shown as being divided into two parts, the lift table may be divided into three parts or three or more parts. Further, the biasing member made up of the weight or the like of the first embodiment is applied to the second embodiment, or conversely, the biasing member made up of the winding spring or the like of the second embodiment is applied to the first embodiment. It may be applied. Furthermore, in each of the foregoing embodiments, the tilting device lift table horizontally retracted state, once, after standing, the grounding member has a lifting table standing state shows an example of tilted omitted tilting device The lift table may be tilted only by the grounding member.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

[0020]

[Effect of the device]

The present invention relates to a lift device for a freight vehicle, wherein a lift table that can be expanded and folded in a packing box is provided so as to be able to move up and down, and the lifting table is folded and stored under a floor of the packing box in a substantially horizontal state. The table rising mechanism that raises the lift table in the horizontal storage state in conjunction with the descending motion of the table, and the table that is detachably attached to the lift table and that projects downward from at least the lift table in the standing state by the biasing member. A lift stored under the floor is provided with a grounding member that tilts the standing lift table and a lock release mechanism that releases the engagement between the grounding member and the lift table when the lift table is in the grounded expanded state. In the equipment, it is possible to automatically tilt the lift table in the deploying direction of the lift table by mechanical means with simple structure. It is possible to provide a lifting device of the truck that you can. Further, the present invention is only set to be vertically movable to deploy and foldable lifting table packing box, the lifting device of freight vehicles for storing in a substantially horizontal state under the floor of the cargo box by folding the lifting table, the detachably mounted to the lift table, and a grounding member for tilting the lift table projects downward from the lifting table by a biasing member, and the ground member and the lifting table at the ground expanded state of the lift table Since the lock release mechanism for releasing the engagement is provided , it is possible to provide a lift device for a freight vehicle capable of automatically tilting the lift table with a simpler structure .

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a developed state of the lift table.

FIG. 3 is a cross-sectional view showing a usage state of the lift table.

FIG. 4 is a cross-sectional view showing a stored state of the lift table.

FIG. 5 is a front view showing an operating state of the lock release mechanism.

FIG. 6 is a cross-sectional view showing the vicinity of the shock absorber.

FIG. 7 is a sectional view showing a second embodiment of the present invention.

FIG. 8 is a front view showing a developed state of the lift table.

FIG. 9 is an enlarged front view of the main part.

[Explanation of symbols]

 2 Packing box 5 Lift table 22,42 Lifting mechanism 25,42 Grounding member 28 Continuous groove (lock releasing mechanism) 29 Escape groove (lock releasing mechanism) 30 Weight (biasing member) 47 Winding spring (biasing member)

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[Procedure amendment]

[Submission date] June 24, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Item name to be amended] Scope of utility model registration request

[Correction method] Change

[Correction content]

[Scope of utility model registration request]

Claims (1)

[Scope of utility model registration request] 1. A lift device for a freight vehicle, wherein a lift table that is expandable and foldable is provided in a load box so that the lift table can be moved up and down, and the lift table is folded and stored in a substantially horizontal state under the floor of the load box. A table raising mechanism that raises the lift table in the horizontal storage state in conjunction with the lowering operation of the table, and a table that is detachably attached to the lift table and that projects downward from at least the lift table in the standing state by a biasing member. A landing member for tilting the lift table in the upright state, and a lock release mechanism for releasing the engagement between the grounding member and the lift table when the lift table is in the grounded deployed state. Lift device.