JP3243200B2 - Loading platform lifting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading / unloading device for a vehicle.

[0002]

2. Description of the Related Art A conventional loading tray lifting device has a structure shown in FIG. That is, a lifting column 02 is provided on the pair of left and right fixed columns 01 so as to be able to move up and down by a driving device 03, a lower portion of the lifting column 02 supports a base of a loading table 04, and an upper portion of the lifting column 02 is a wire rope. The front end of the receiving table 04 is supported via the opening 05 so that the receiving table 04 can be moved up and down in a horizontal state.

[0003] Ayumi board 06 is provided at the tip of load receiving table 04 to cover a step between the ground and load receiving table 04.

[0004]

However, in the above structure, since the loading tray is always in a horizontal state, even if the loading tray is lowered at the lowest position, the difference between the ground and the upper surface of the loading tray is that of the loading tray. Since the thickness of the support frame for supporting the base of the receiving table is added to the thickness, the step becomes extremely large.

[0005] For this reason, the step is covered by the oyster plate. However, since the step is large, the inclination of the oyster plate becomes steep, and a great deal of labor is required to get on the ground. In order to solve the drawback, if the length of the Ayumi board is lengthened, the inclination can be loosened.However, when the time required to transfer from the ground to the loading tray becomes longer, the weight of the Ayumi board increases and it is folded and stored. Has the disadvantage of requiring a great deal of labor.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a loading / unloading device which can automatically minimize a step between the ground and the upper surface of the loading tray when the loading tray is lowered, thereby improving work efficiency.

[0007]

According to the present invention, a pair of right and left fixed columns are erected at a rear portion of a vehicle body, and a lifting column which can be moved up and down by a driving device is provided in the fixed column. Is a base for supporting the base of the receiving cradle, and supporting the leading end of the receiving cradle with a support member extending from the lifting column, the lifting column is divided into an upper lifting column and a lower lifting column. The two lifting columns are connected by a connecting member so that the distance can be changed within a predetermined interval, a supporting member is connected to the upper lifting column together with a driving device, and a loading table base is provided at a lower portion of the lower lifting column. When the upper elevating column is further lowered from the lowermost position of the lower elevating column, the interval fluctuates and the load receiving table is tilted.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a packing box mounted on a vehicle body 2, and a reinforcing girder 4 is provided below the floor 3 of the packing box 1. However, the one located at the inner rear portion of the reinforcing girder 4 has a shorter height, and a storage space 5 which is a flat space is formed between the vehicle body 2 and the packing box 1.

Reference numerals 6 and 6 denote a pair of right and left fixed columns which are fixed to the vehicle body 2 and the rear end of the packing box 1 at right and left sides. The upper compartment is closed and the lower end is open.
A vertically long slit 10 is formed on the rear surface. An elevating column 11 is provided in the rear chamber 9 of the fixed column 6 so as to be able to move up and down. The lifting column 11 is composed of a short and flat upper lifting column 12 and a long and flat lower lifting column 13. A pair of upper, lower, left and right guide rollers 14 are pivotally supported on the upper elevating column 12 so that the inside of the rear chamber 9 can be smoothly raised and lowered, and a mounting portion 15 protruding from the slit 10 is formed at an upper end, and at a lower end. An upper connecting portion 16 in which flat plates are provided orthogonally is formed.

A pair of upper, lower, left and right guide rollers 1 is provided on the lower lifting column 13 so that the inside of the rear chamber 9 can be raised and lowered smoothly.
7, a lower connecting portion 18 having a flat plate provided in an orthogonal shape is formed at the upper end, and a bracket 19 projecting from the slit 10 is fixed at the lower end. As shown in FIG. 11, a pair of right and left bolts 21 and nuts 22 as connecting members 20 are provided between the upper and lower connecting portions 16 and 18 to connect the upper and lower lifting columns 12 and 13. Further, the connecting member 20 causes the upper and lower lifting columns 12, 13 to maintain a predetermined distance L, and the upper lifting column 12 or the lower lifting column 1 only in a direction in which the distance L decreases.
3 can be moved.

Reference numeral 23 denotes a transmission member such as a wire rope which is a part of the driving device 24.
5, one end of which is connected to the upper lifting column 12 and the other end of which is connected to a cylinder (not shown). As a result, when the cylinder expands and contracts, the upper lifting column 1
2 is raised and lowered, and further the lower lifting column 1 is connected via the connecting member 20.
3 ascends and descends together with the upper elevating column.
At this time, the lifting column 11 can move up and down while maintaining a predetermined distance L by the weight of the lower lifting column 13 and the like.

Numeral 26 denotes a loading platform for loading and lifting the cargo. The loading platform 26 is flat and slightly smaller than the interval between the pair of right and left fixed columns 6 (FIG. 2). It can be stored in the storage room 5 below the packing box 1. As shown in FIGS. 7 and 12, the base of the receiving table 26 is supported by being sandwiched between a lower supporting frame 27 having a box-shaped cross section and a pair of upper supporting frames 28 having a flat plate shape. ing.

The lower support frame 27 is fixed between a pair of left and right brackets 19 protruding from the lower elevating column 13, and when the lower elevating column 13 descends most, the bracket 1 is lowered.
9 or the lower support frame 27 is grounded. A bracket 29 is provided on the lower support frame 27.
The roller 30 supports the load receiving table 26, and the load receiving table 26 can be smoothly moved back and forth to the overhanging position or the storage position.

The upper support frames 28, 28 are fixed to the inner surfaces of the brackets 19, respectively, overlap with the left and right corners of the base of the load receiving table 26 with some gap therebetween, and prevent the base of the load receiving table 26 from jumping up. When the load moves from the receiving table 26 into the packing box 1, the load is not obstructed. Further, pin holes 31 and 32 are provided in the upper support frame 28 and the receiving table 26, respectively.
By inserting the stopper pin 33 into the stopper, the load receiving table 26 is prevented from shifting in the front-rear direction during elevating.

One end of a support member 35 is connected to the left and right ends of the load receiving table 26 via a bracket 34, and the other end of the support member 35 is connected to the mounting portion 15 of the upper elevating column 12, and When the distance L between the columns 12 and 13 is the maximum, the support member 35 holds the load receiving table 26 horizontally, and when the distance L is reduced, the load receiving table 26 is held.
Can be inclined backward and downward.

When the support member 35 is a wire rope, a stopper 36 is fixed to the other end of the support member 35.
The stopper 36 moves away from the mounting portion 15 when the container 6 is held horizontally and moved forward to store the load receiving table 26. If a flexible rope is used in place of the wire rope, both ends can be connected to each other, and the rope can be slackened when the loading tray 26 is moved forward.

Reference numeral 37 denotes an ayumi plate provided at the tip of the loading tray 26. The ayumi plate 37 covers a step between the ground and the upper surface of the loading tray 26. The ayumi plate 37 is hinged to the loading tray 26 so that it can be stored on the loading tray 26 when the ayumi plate 37 is not used.
In the embodiment, a bolt and a nut are used as the connecting member. However, the same operation and effect can be obtained by connecting the upper and lower supporting columns using a rope or the like.

Although the stopper pins are used as the means for preventing the forward / backward movement of the load receiving table, the present invention is not limited to the stopper pins, and any structure capable of restricting the forward / backward movement of the load receiving table is sufficient. Next, the operation of the present invention will be described with the above-described configuration. First, the loading tray 2 is moved from the state of FIG.
6 is extended rearward (right side in FIG. 6) to be in the state of FIG. At this time, since the part of the load receiving table 26 is supported by the rollers 30, it can be moved smoothly, and when the overhang is completed, the stopper 36 of the support member 35 abuts on the mounting portion 15 and cannot be further extended. Can be recognized.

After the overhang of the receiving table 26 is completed, as shown in FIG.
The stopper pin 33 is inserted into the stopper 32 to regulate the forward / backward movement of the receiving table 26. At this point, the upper and lower lifting columns 12, 1
The interval L of 3 is maximized due to the weight of the lower lifting column 13 and the like, so that the load receiving table 26 is held horizontally.

When unloading the luggage from the packing box 1 in this state, the drive unit 24 is operated to raise the load receiving table 26 until it matches the floor 3 of the packing box 1 as shown in FIG. 37 is rotated to protrude. In the state of FIG. 3, the load in the packing box 1 is moved onto the receiving table 26. After the movement is completed, the driving device 24 is operated to lower the load receiving table 26. During the lowering, the space L between the upper and lower elevating columns 12 and 13 is maintained, so that the load receiving table 26 is also held horizontally and the load can be unloaded in a stable state.

The lowering of the lower lifting column 13 is stopped by the lowering of the loading column 26 and the lowering of the lower lifting column 13 as shown in FIG. When the transmission member 23 of the drive unit 24 is further lowered from this state, the lower lifting column 13 is stopped by the respective weights of the upper lifting column 12 and the loading tray 26, but the upper lifting column 12 is lowered,
The interval L becomes smaller.

As the distance L is reduced, the tip of the load receiving table 26 supported by the support member 35 as shown in FIG. When the entire receiving platform 26 descends, the ground and the receiving platform 2 are lowered.
6 The step with the upper surface is reduced, and the step is covered with a gentle inclination by a short ridge plate 37. Thereby, the receiving table 26
The upper luggage is lowered onto the ground through the ayumi board 37.

At this time, since the base of the receiving table 26 has a slight gap between the upper support frame 28 and the receiving table 26 shown in FIG. 12, the receiving table 26 can be allowed to incline backward. ing. Next, when the loading / unloading operation is completed and the loading tray 26 is stored, the driving device 24 is operated from the state shown in FIG. 5 to raise the lifting column 11. When the lifting column 11 is raised, only the upper lifting column 12 is raised until the distance L between the upper and lower lifting columns 12 and 13 is maximized,
When the interval L becomes the maximum, the loading tray 26 is in a horizontal state as shown in FIG.

From this state, the elevating column 11 is further raised to stop at the position shown in FIG. 1, that is, the position where the receiving table 26 and the storage room 5 coincide with each other. After the loading tray 26 is stopped, the fold plate 37 is rotated to overlap the loading tray 26 and the stopper pin 33 is pulled out. In this state, the loading tray 26 is pushed forward, that is, to the left in FIG. 26 is accommodated in the storage room 5. At this time, the stopper 36 of the support member 35 does not hinder the storage of the load receiving table 26 by separating from the mounting portion 15.

[0025]

As described above, according to the present invention, the lifting column for supporting the loading table so as to be able to move up and down is divided into the upper lifting column and the lower lifting column, and the upper and lower lifting columns are connected by the connecting member. A predetermined distance between the upper and lower lifting columns is maintained during the elevating and lowering, and the lowering of the load receiving table causes the distance to fluctuate and the load receiving table to tilt.

[0026] This makes it possible to reduce the step between the ground and the upper surface of the receiving tray, and to load and unload the cargo from the ground to the receiving tray in a short time with a small amount of labor. In addition, the efficiency of loading and unloading can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of the present invention.

FIG. 2 is an AA diagram of FIG.

FIG. 3 is an operation state diagram of a loading tray highest position.

FIG. 4 is an operation state diagram of a lowermost position of a lower lifting column.

FIG. 5 is an operation state diagram at a lowest position of the loading tray.

FIG. 6 is an operation state diagram of a loading tray storage position.

FIG. 7 is an enlarged cross-sectional view taken along the line BB of FIG. 1;

FIG. 8 is an enlarged cross-sectional view taken along the line CC of FIG. 6;

FIG. 9 is a partially enlarged view of the lifting column during lifting of the loading table.

FIG. 10 is a partially enlarged view of a lifting column at the time of lowering the loading tray.

FIG. 11 is a partially enlarged view of a lifting column.

FIG. 12 is an enlarged view of the base of the receiving tray.

FIG. 13 is a conventional loading tray elevating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Packing box 2 Body 5 Storage room 6 Fixed support 11 Lifting support 12 Upper lifting support 13 Lower lifting support 20 Connecting member 26 Receiving stand 35 Supporting member

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-9-104281 (JP, A) JP-A-9-39641 (JP, A) Japanese Utility Model 63-75442 (JP, U) Japanese Utility Model 59-104 180939 (JP, U) Japanese Utility Model Hei 6-78072 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60P 1/46 B60P 1/44

Claims (1)

(57) [Claims] 1. A pair of right and left fixed columns are erected at the rear of a vehicle body, and a lifting column that can be raised and lowered by a driving device is provided in the fixed columns, and a base of a loading table is supported below the lifting column. In a loading cradle lifting device in which the leading end of the loading cradle is supported by a support member extending from the lifting column, the lifting column is divided into an upper lifting column and a lower lifting column, and both lifting columns are separated by a predetermined distance. The upper lifting column is connected to a supporting member together with a driving device, and the lower lifting column supports a loading table base at the lower portion, and the lower lifting column is When the upper lifting column is further lowered from the lowermost position, the interval changes and the loading table is tilted.