JPH0657734U - Lifting device for cargo - Google Patents

Abstract

(57) [Abstract] [Purpose] While it has a large lift table that can lift and lower a large heavy load, it can be mounted on a small vehicle body with a short ROH, and moreover, simply by opening the rear door without raising and lowering, Loads can be taken in and out, and the operation is easy. [Structure] Struts 52 arranged on both sides of the rear end of the luggage compartment,
Support members 60, 61 provided on the chassis frame 58
A first arm member 53 and a second arm member 54, which are rotatably provided at one end side of the support column 52 and at the other end side of the support member 61 with a predetermined axial distance therebetween.
The drive means 62 for driving the shaft, the connecting member 55 for connecting the lower sides of both columns, and the slit 5 at the position of the chassis frame 58.
7a and a lift table 57 that moves back and forth on the connecting member 55.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a load lifting device provided at a rear portion of a cargo bed of a truck for collecting and delivering cargo.

[0002]

[Background technology]

 In recent years, moving luggage has been established by a major logistics company, in which a system with a width of 1100 mm x length of 1100 mm x height of 1900 mm or a dedicated box with caster wheels attached to the bottom of a basket is used to carry the goods. , Is being deployed nationwide online. Also, the same logistics company has established and operates a courier system on a nationwide network.

However, since a small-sized parcel is delivered to each individual home, the courier must be a small car with a short vehicle length so that it can be entered even on a narrow road. On the other hand, a special moving vehicle requires a large lifting device (table lifter) in order to load and unload the above-mentioned special box, and is a large vehicle with a long vehicle length.

It was impossible to equip the former small-sized home delivery vehicle with a large-sized lifting device as a result of impairing the function of the home delivery vehicle. The latter moving-only vehicle is inconvenient to use when the small luggage is taken in and out from the rear door without using the rear lifting device, as the lifting device becomes a nuisance. In addition, due to severe traffic congestion and severe parking regulations in recent years, it is difficult to turn around, and speedy collection and delivery processing is required for home delivery, which is completely inappropriate and cannot be used. In other words, since the lifting device for loads is used to lift and lower heavy loads from the ground to the platform, it is essential for moving vehicles that carry large heavy loads, but it is a courier that collects small loads. I didn't need to.

However, different vehicles result in different garages, sales offices, and drivers, and the same company operates different vehicles independently in the same area, which promotes traffic congestion. Is the current situation.

[0006]

[Problems to be solved by the device]

 As the lifting and lowering device for the cargo used in the above-mentioned moving vehicle, there are A to G types as shown in FIGS. 9 to 15. The same functional components will be described with the same reference numerals.

In the case of A, B and E types (FIG. 9, FIG. 10, FIG. 13), the lift table 103 is moved up and down by the parallel link 104 and the elevating column 105. The lift table 103 is flipped up behind or behind the rear door 102 of the chamber 101. The lift table 103 has a drawback that it cannot be loaded or unloaded in the luggage compartment 101 unless it is horizontally operated.

In the case of the C type (FIG. 11), since the lift table 103 is retracted and stored under the floor by the parallel link 104 at the time of traveling, if the length L of the lift table 103 is increased, the rear wheel tires 106 are removed. There is a drawback that the dimension ROH (rear overhang) to the rearmost part of the vehicle body becomes long and the entire vehicle body becomes long. This also applies to the D type (Fig. 12), where the floor of the ROH part moves up and down.

In the case of the F type (FIG. 14), since the lift table 103 is folded and stored under the floor during traveling, the storage work is complicated. In particular, when the lift table 103 is large, the weight becomes heavy, which is dangerous and difficult to handle, and there is a drawback that the ROH cannot be shortened too much due to the parallel link 104.

The G type (FIG. 15) is a modification of the A type, in which the lift table 103 is vertically tilted below the rear door 102 and stored. When the lift table 103 is made large, the ground clearance H at the tip of the lift table 103 becomes insufficient during traveling, so that the lift table 103 cannot be made too large.

The object of the present invention is to have a large lift table that can lift and lower a large heavy load, and can be attached to a small vehicle body with a short ROH. It is intended to provide an elevating device for loading and unloading a load that is easy to operate.

[0012]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a load lifting device according to the present invention is provided with struts arranged on both sides of a rear end of a luggage compartment, support members provided on a chassis frame, and one end side of the struts. The other end side of the support member is rotatably provided with a predetermined inter-axis distance therebetween, and one or more sets of first and second arm members forming a parallel link mechanism, the support column, or the first or second arm member. A drive table that drives the second arm member, a connecting member that connects the lower sides of the two columns, and a lift table that has a slit in a portion corresponding to the chassis frame or the vertical joist and slides back and forth on the connecting member. It is configured to include and.

In this case, the first and second arm members make the inter-axis distance on the support member side shorter than the inter-axis distance on the strut side, and when the strut is raised, the first and second arm members are substantially vertical, It can be characterized in that when it descends, it tilts backward. In addition, a rolling member that is rotatably provided on the connecting member and is in rolling contact with the lift table can be provided. Further, it is possible to provide a hanging member for lifting the back of the lift table from the column. At this time, the suspension member may be adjustable in length.

In addition, the load lifting device according to the present invention includes a pillar disposed on both sides of a rear end of the luggage compartment, a connecting member that connects the lower sides of both pillars, and a lifting mechanism that lifts and lowers the pillar. A lifting device for a load including a lift table that has a slit in a portion corresponding to the chassis frame or the vertical joist and slides back and forth on the connecting member, and is provided so as to project rearward on both sides of the connecting member. It is characterized in that an arm member for supporting the lift table is provided. In this case, the arm member is rotatably provided on both sides of the connecting member, is parallel to the connecting member when the lift table is stored, and is substantially perpendicular to the connecting member when used. Can be Further, the arm member may be a member having a U-shaped cross section that covers both sides of the lift table. Further, a spherical or cylindrical rotating member is provided at the rear end of the lift table, and a guide portion and an engaging concave portion at the end of the guide portion are provided on the inner side surface of the arm member, so that the maximum withdrawal of the lift table is possible. At times, the rotating member may be locked by being engaged with the engaging recess.

[0015]

[Action]

 According to the present invention, columns are provided on both sides of the rear end of the luggage compartment, and the columns are lifted and lowered by a parallel link mechanism composed of a supporting member and first and second arm members, and both columns are connected by a connecting member to form a slit. Since a lift table is inserted so that it can slide back and forth, it can be retracted and stored while avoiding the chassis frame or vertical joists under the floor of the vehicle. Therefore, it can be installed on a conventional vehicle without any modification. In addition, the swing motion of the first and second arm members causes the support column to move up and down while maintaining a substantially vertical position outside the gate pole, so that at the raised position (top dead center), the front end of the lift table has a gap to the rear end of the bed floor. Since there is no contact and it stops, loading and unloading can be done smoothly.

Further, the rolling table allows the lift table to roll into contact with the connecting member, so that the lift table can be easily taken in and out. Further, since the suspension member is provided, the lift table can be kept substantially horizontal when it is pulled out. At this time, if the length of the suspension member can be adjusted, the lift table can be raised backward or lowered backward.

On the other hand, since arm members that project rearward to support the lift table are provided on both sides of the connecting member, the lift table can be easily and reliably supported without using hanging members on both sides of the lift table. be able to.

[0018]

【Example】

 Next, the present invention will be described in more detail with reference to examples. 1 to 3 are views showing an embodiment of a load lifting device according to the present invention. FIG. 1 is a perspective view, FIG. 2 is a side view, and FIG. 3 is a rear view. As shown in FIGS. 1 to 3, the automobile 1 is a vehicle used for home delivery and has a weight of about 3 tons. For example, a vehicle having a total length of 4925 mm, a total width of 1730 mm, and a total height of 3110 mm is preferably used. To be In this automobile 1, gate posts 51 are arranged on both sides of the rear surface of the vehicle body 2, and the gate posts 51 are provided with rear doors 3 via hinges 51b.

An elongated opening 51 a is formed in the up-down direction in the lower part of the rear surface of these gate posts 51. The left and right struts 52 are provided corresponding to the respective gate posts 51, and are vertically translated by the upper arm 53 and the lower arm 54, and when the top dead center is reached, each of the gate posts is passed through the opening 51a. It is housed in 51. The left and right columns 52 are connected by a cylindrical connecting bar 55 arranged in the horizontal direction via a bracket 52c provided at the lower end of the rear surface.

The lift table 57 is for loading and hoisting a load, and is inserted on the connecting bar 55 so as to be pulled out. The lift table 57 is formed with two slits 57b for biting the web portion of the vertical joist 1c. The chain 56 is for suspending the lift table 57, and the lower end thereof is fixed to the anchor 57 a of the lift table 57. The upper end of the chain 56 is hooked in a T-shaped hole 52d formed in the upper rear surface of the column 52. It is possible to adjust the length of the chain 56 by hooking the links near the upper end in the T-shaped hole 52d by shifting them by one pitch, and thereby setting the inclination angle of the lift table 57. You can Therefore, it is possible to adjust the lift table 57 so as to move backward or upward. For example, even when there is a step between the platform and the platform, the lift table 57 can be used as a bridge plate.

The support bar 60 is horizontally fixed to the chassis frame 58 of the automobile 1 via a bracket 59. Brackets 61A and 61B formed of two plates are vertically fixed to the left and right ends of the support bar 60. The bracket 61 (61A, 61B), the support column 52, the upper arm 53 and the lower arm 54 constitute a parallel link mechanism. That is, one end of the upper arm 53 is rotatably attached to the column 52 through the pin 52a, and one end of the lower arm 54 is rotatably attached through the pin 52b. In addition, the other end of the upper arm 53 is rotatably supported in the brackets 61A and 61B by the pin 61a, and the lower arm 54 is rotatably supported in the brackets 61A and 61B about the support bar 60. It is supported.

The lift cylinder 62 is for driving the parallel link mechanism, an upper end of which is rotatably supported in the brackets 61A and 61B by a pin 62a, and a lower end of which is a lower arm 54 by a pin 62b. Is rotatably supported at the other end of. Therefore, by extending and contracting the lift cylinder 62, the support column 52 is moved in parallel while being kept substantially vertical, and the lift table 57 and the table position (A) as shown in FIG. Move between C).

The connecting bar 55 connects the left and right columns 51 at their lower ends and supports the front end of the lift table 57. In this embodiment, a cylindrical member (round pipe) is used. There is. The connecting bar 55 is provided with a collar 55a rotatably mounted on the outer periphery thereof, and the lift table 57 makes rolling contact with the collar 55a, so that it can be smoothly taken in and out.

FIG. 4 to FIG. 6 are views showing a lock mechanism used in the load lifting device according to the embodiment. The lock mechanism 63 is provided on the lower side of the lift table 57, and has a lever 64 rotatably provided on the lift table 57 and a coupling for transmitting a driving force of the lever 64, one end of which is pivotally supported by the lever 64. The rod 65, a lock pawl 66 rotatably attached to the lift table 57 by connecting the other end of the connecting rod 65, a spring 67 for biasing the lock pawl 66 in the counterclockwise direction in FIG. 5, and a connecting bar. The lock receiving plate 68 is provided on the 55 side and engages with the lock claw 66.

The lock mechanism 63 rotates the lever 64 in the direction of the arrow, pulls out the lift table 57 with the lock pawl 66 retracted, and releases the lever 64 at the pulled-out position, so that the spring 67 is attached. Due to the force, the lock claw 66 rotates counterclockwise in FIG. 5 to engage with the lock receiving plate 68, and the lift table 57 is locked to the connecting bar 55.

Next, the operation of the load lifting device according to this embodiment will be described. When the lifting device of this embodiment is used, first, the rear door 3 of the automobile 1 is opened about 260 ° about the hinge 51b provided at the outer corner of the gate post 51 to be fully opened. Next, at the table position (B) in FIG. 2 or 3, the lock mechanism 63 (see FIG. 4) stored under the lift table 57 is removed, and the lift table 57 is pulled out to the rear of the vehicle body 2.

When the lift table 57 is pulled out to the maximum, the front end of the lift table 57 is placed on the support bar 60 and does not extend forward from the rear surface of the support column 52. At this time, the lock mechanism 63 automatically locks and does not return. In this state, the upper end of the chain 56 is inserted into the T-shaped hole 52d of the column 52, and the rear portion of the lift table 57 is lifted and supported.

Next, the lift cylinder 62 is extended to move the top dead center (left side in FIG. 3) of the moving range of the upper arm 53 and the lower arm 54, that is, the lift table 57 to the table position (A). At this position, the lift table 57 is at the same position as the floor board 1a, as shown in FIG.

Subsequently, the load in the vehicle body 2 is placed on the lift table 57 and the lift cylinder 62 is contracted. When the lift cylinder 62 is contracted, the support column 52 supported by the upper arm 53 and the lower arm 54 descends while maintaining the parallelism (parallel link mechanism) to reach the table position (C). During this movement, the support column 52 is kept in a vertical state, so that the lift table 57 is kept in a horizontal state and the load does not slip and fall.

On the contrary, when loading a load, the load is placed on the lift table 57, moved from the table position (C) to the table position (A), and the load is loaded into the vehicle body 2. You can

Next, when the lift table 57 is stored, the lift table 57 is moved to the table position (B) by the lift cylinder 62, the lock mechanism 63 is unlocked, and the lift table 57 is moved to the table position shown in FIG. Push it forward to (B '). Then, the lift table 57 is positioned so as not to project backward from the support bar 60, and the lock mechanism 63 is actuated and fixed, and the storage of the lifting device is completed. At this time, since the slit 57b is formed in the lift table 57 to be inserted, the lift table 57 can be stored without interfering with the chassis frame 1b or the vertical joist 1c of the automobile 1.

Since the lift table 57 can be stored under the floor through the tire 1d of the automobile 1, the lift table 57 can be made sufficiently long as necessary. Even in that case, since the front end of the lift table 57 is supported by the support bar 60 and the rear part thereof is supported by the chain 56, the strength of the lift table 57 is the same as in the case of a cantilevered support like other lifting devices. Compared to, it is strong enough and can be lightened accordingly.

FIG. 7 is a partial perspective view of a second embodiment of a load lifting device according to the present invention. The parts having the same functions as those of the first embodiment described above are designated by the same reference numerals, and the duplicated description will be omitted.

In the first embodiment, the lift table 57 is explained in a state of being supported substantially horizontally. However, when the load is a box with caster wheels, the lift table 57 is lowered backward when landing. Is preferred. However, if the lift table 57 is lowered backward, the box with caster wheels may roll down when moving up and down. Therefore, in the second embodiment, the caster wheeled box is constructed so that it can be safely and easily moved up and down.

In the lifting device according to the second embodiment, the lift table 57 is provided with the road plate 68 and the caster stopper 69. The road plate 68 and the caster stopper 69 are provided on the lift table 57 so as to be rotatable about the shafts 68b and 69b, respectively. Slits 68a and 69a are formed in the road plate 68 and the caster stopper 69 at positions corresponding to the slits 57a of the lift table 57. The caster stopper 69 is biased by a spring 70 via a lever 71 in a rising direction (state of FIG. 7). When the lift table 57 is stored, when the road plate 68 is lifted and inverted and placed on the lift table 57, the caster stoppers 69 are pressed by the weight of the road plate 68, and the upper surface of the lift table 57 and the road plate 57. It is sandwiched between 68.

By adjusting the length of the chain 56, at the time of landing (bottom dead center of the upper arm 53 and the lower arm 54), the upper surface of the lift table 57 is lowered backward, and the rear end of the road plate 68 can be easily moved. Land on. The road plate 68 hits the seat (stopper) 57c of the lift table 57 and stops at the angle of rearward descent. When the box with caster wheels containing the load is loaded, the caster wheels passing over the road plate 68 push the caster stopper 69 onto the lift table 57 to get over, but after getting over, the spring 70 causes the caster stopper 69 to move. The caster wheels are prevented from rolling up due to the slope of the lift table 57 falling back and down.

FIG. 8 is a schematic view partially showing a third embodiment of the load lifting device according to the present invention. In the first and second embodiments, the position of the pin 61a serving as the axis of the upper arm 53 or the lower arm 54 is A, the position of the support lever 60 is B, the position of the pin 52a is C, and the position of the pin 52b is. Letting D be straight line AB = straight line CD = straight line C′D ′, and straight line AB, straight line CD and straight line C′D ′ are substantially parallel. Therefore, if the lift table 57 moves up and down the caster-wheeled box, if the lift table 57 is lowered backward at the time of landing, the lift table 57 is also lowered backward even at the table position (A).

In the third embodiment, the straight line AB is slightly shortened like the straight line A′B. That is, the position of the pin 61a of the upper arm 53 is slightly downwardly shifted and attached. Therefore, the straight line A'B and the straight line CD are substantially parallel to each other, but the straight line A'B and the straight line C "D 'are not parallel to each other, and the point C" is displaced rearward from the point C'. Therefore, even if the straight line A′B and the straight line CD are parallel to the gate post 51, the straight line C ″ D ′ is not parallel at the lower end, and the upper part of the gate post 51 falls backward. The rear end lands simultaneously with the connecting bar 52.

As described above, in the third embodiment, at the table position (A), the lift table 57 is parallel to the floor plate 1a, and at the table position (C), the upper surface of the lift table 57 is rearward and downward. The rear end will land easily.

16 to 18 are views showing a fourth embodiment of the load lifting device according to the present invention. FIG. 16 is a top view, FIG. 17 is a rear view and FIG. 18 is a side view. . In the first embodiment, the rear end of the lift table 57 is suspended by the chain 56, but in the fourth embodiment, as shown in FIG. 16, an L-shaped bracket 80 is attached to the column 52. A connecting bar 55 is provided, and a roller 82 is rotatably attached to the rear end side. A grip 82 is provided at the front end of the lift table 57, and the grip 82 hooks the connecting bar 55. According to the fourth embodiment, it is not necessary to attach and detach the chain 56 and the side surface of the lift table 57 is opened, so that the cargo can be loaded from the side.

FIG. 19 is a perspective view partially showing a fifth embodiment of a load lifting device according to the present invention. In the fifth embodiment, a cross-section U-shaped rail 84 is attached by a pin 85 to a bracket 52c provided at the lower ends of the left and right columns 52 so as to be rotatable in a horizontal plane. When the lift table 57 is stored under the floor plate 1a, the rail 84 is rotated so as to be parallel to the connecting bar 55 as shown in the left half of FIG. 19, and the connecting bar 55 is held. I am trying to put it in. When pulling out the lift table 57, as shown in the right half of FIG. 19, the rail 84 is rotated so as to be substantially perpendicular to the connecting bar 55, and the outermost bone of the lift table 57 is placed inside the rail 84. Insert the portion 57c and pull it out so that the rail 84 serves as a guide. Therefore, since the lift table 57 is sandwiched between the rails 84, the lift table 57 does not shift in the left-right direction.

According to the fifth embodiment, since the outermost bones 57c incorporated on the left and right of the lift table 57 are supported by the rails 84, they are not easily bent. Therefore, the lift table 57 is supported at the front end by the connecting bar 55 and at the rear end by the lateral ribs 57d of the lift table 57, and both ends are supported, which is advantageous in terms of strength. Further, when the lift table 57 is used, the lift table 57 can be pulled out only by opening the rails 84 to the left and right approximately 90 degrees. Therefore, the weight of the lift table 57 is applied to the rails 84, and the lift table 57 needs to be pulled out while being lifted. Lost. Furthermore, when the lift table 57 and the rail 84 are stored (see the left half state in FIG. 19), the rail 84 serves as a step, and an operator can easily enter and leave the platform. In the fifth embodiment, since the front end of the lift table 57 does not float above the connecting bar 55 regardless of the position of the load, the grip 82 as shown in the fourth embodiment is unnecessary.

FIG. 20 is a side view partially showing a sixth embodiment of a load lifting device according to the present invention. In the sixth embodiment, a ball caster 86 is provided at the rear end of the side surface of the lift table 57. Further, a guide 87 and a guide groove 88 are provided inside the rail 84 to guide the left, right, up, and down, and at the same time, the ball caster 86 falls into the guide groove 88 at the maximum pull-out position of the lift table 57. It will be locked automatically. Therefore, the lock mechanism (see FIG. 6) when pulling out the lift table 57 can be omitted. With such locking means, even if the rear end of the lift table 57 lands first and then the rail 84 lands, the lift table 57 escapes without applying excessive force. A roller may be used instead of the ball caster 86.

By using the load lifting device described above, many moving trucks with lifting devices are used in Japan at present, and a small number of small-sized home delivery vehicles for parcel delivery, which are also very often used. Can be combined with. In other words, if a small courier is equipped with the lifting device of the present invention, the small courier will be able to collect and deliver moving luggage within its operating area. Therefore, the provision of the cargo lifting / lowering device according to the present invention for a small-sized courier, and the fact that the courier can partially take over the moving field also means that the current transportation industry suffers from a serious labor shortage and deterioration of traffic conditions. The economic effect on the is immeasurable.

Also, since the lifting device according to the present invention is fixed only to the chassis frame and the lifting device as a whole is configured separately from the vehicle body (body), the lifting device is mounted in a chassis state, and At, the body can be mounted. Therefore, the lifting device of the present invention can be attached regardless of the shape of the body (for example, fire truck, tank truck, mixer truck, etc.) as long as the space for housing the columns is secured.

[0046]

[Effect of device]

 As described in detail above, according to the present invention, both columns are connected by a connecting member so that a lift table with a slit can be slid forward and backward, so that a chassis frame or a vertical joist under the floor of the vehicle is avoided. It can be retracted and stored. Therefore, it can be installed on a conventional vehicle without any modification.

In addition, the supporting column is moved up and down by a parallel link mechanism including a supporting member and first and second arm members, and the supporting column is swung by the first and second arm members so that the supporting column is substantially vertical outside the gate column. Since the lift table moves up and down while maintaining the same, the front end of the lift table comes into contact with the rear end of the bed floor without any gap at the ascended position (top dead center), and the load can be loaded and unloaded smoothly.

Further, the rolling table allows the lift table to roll-contact on the connecting member, so that the lift table can be easily taken in and out.

Furthermore, since the hanging member is provided, the lift table can be kept substantially horizontal when it is pulled out. At this time, if the length of the suspension member can be adjusted, the lift table can be raised or lowered backward.

On the other hand, since the arm members for supporting the lift table are provided on both sides of the connecting member so as to project rearward, the lift table can be supported from the lower side or the lateral side. The side is open, and it is also advantageous in strength. In addition, since the arm member serves as a guide, there is an effect that the lift table can be easily taken in and out.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a load lifting device according to the present invention.

FIG. 2 is a side view showing the lifting device according to the first embodiment.

FIG. 3 is a rear view showing the lifting device according to the first embodiment.

FIG. 4 is a view showing a lock mechanism used in the lifting device according to the first embodiment.

5 is a diagram partially showing the lock mechanism shown in FIG.

FIG. 6 is a view partially showing the lock mechanism shown in FIG.

FIG. 7 is a perspective view partially showing a second embodiment of a load lifting device according to the present invention.

FIG. 8 is a schematic view partly showing a third embodiment of the load lifting device according to the present invention.

FIG. 9 is a diagram showing a conventional example (A type) of a load lifting device.

FIG. 10 is a view showing a conventional example (B type) of a load lifting device.

FIG. 11 is a view showing a conventional example (C type) of a load lifting device.

FIG. 12 is a view showing a conventional example (D type) of a load lifting device.

FIG. 13 is a diagram showing a conventional example (E type) of a load lifting device.

FIG. 14 is a view showing a conventional example (F type) of a load lifting device.

FIG. 15 is a view showing a conventional example (G type) of a load lifting device.

FIG. 16 is a top view showing a fourth embodiment of a load lifting device according to the present invention.

FIG. 17 is a rear view showing a fourth embodiment of a load lifting device according to the present invention.

FIG. 18 is a side view showing a fourth embodiment of a load lifting device according to the present invention.

FIG. 19 is a perspective view partially showing a fifth embodiment of the load lifting device according to the present invention.

FIG. 20 is a side view partially showing a sixth embodiment of the load lifting device according to the present invention.

[Explanation of symbols]

 1 Car 1a Luggage floor 1c Vertical joist 1d Tire 1e Lateral joist 2 Car body 3 Rear door 51 Gate post 52 Strut 53 Upper arm 54 Lower arm 55 Connecting bar 56 Chain 57 Lift table 58 Chassis frame 59 Bracket 60 Support bar 61 Bracket 62 Lift cylinder

Claims (9)

[Scope of utility model registration request] 1. Supports arranged on both sides of a rear end of the luggage compartment, support members provided on a chassis frame, one end of the support pillars, and the other end of the support members at predetermined axial distances from each other. And one or more sets of first and second arm members that are rotatably provided to form a parallel link mechanism, drive means for driving the support pillar or the first or second arm member, and both support pillars. An elevating / lowering device for a load, comprising: a connecting member that connects the lower side; and a lift table that has a slit in a portion corresponding to the chassis frame or the vertical joist and that slides back and forth on the connecting member. 2. The first and second arm members have an inter-axis distance on the support member side shorter than an inter-axis distance on the support column side, and descend substantially vertically when the support column rises. The load lifting device according to claim 1, wherein the load lifting device tilts backward sometimes. 3. The load lifting device according to claim 1, further comprising a rolling member rotatably provided on the connecting member and in rolling contact with the lift table. 4. The lifting / lowering device for a load according to claim 1, further comprising a suspending member for suspending a rear portion of the lift table from the support column. 5. The load lifting device according to claim 4, wherein the suspension member is adjustable in length. 6. Supports arranged on both sides of the rear end of the luggage compartment, a connecting member for connecting the lower sides of the supports, an elevating mechanism for elevating the supports, and the chassis frame or the vertical joists. In a load lifting device including a lift table that has a slit in a portion and slides back and forth on the connecting member, provided on both sides of the connecting member so as to project rearward,
A lift device for a load, comprising an arm member for supporting the lift table. 7. The arm member is rotatably provided on both sides of the connecting member, is parallel to the connecting member when the lift table is stored, and is substantially perpendicular to the connecting member when used. The lifting device for a load according to claim 6, which is characterized in that. 8. The load lifting device according to claim 7, wherein the arm member is a member having a U-shaped cross section that covers both sides of the lift table. 9. A spherical or cylindrical rotating member is provided at the rear end of the lift table, and a guide portion and an engaging recess at the end of the guide portion are provided on the inner side surface of the arm member. The load lifting device according to claim 8, wherein the rotating member is locked by being engaged with the engaging concave portion at the time of maximum withdrawal.