JPS6357495A - Elevator - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a lifting device capable of lifting personnel, materials, etc. to a high place by moving a lifting platform upward and downward above a vehicle body. The present invention has a convenient structure for raising and lowering a lifting platform, and particularly relates to a lifting device that can move a lifted lifting platform horizontally in the left-right direction with respect to the traveling direction of a vehicle body.

[Conventional technology]

F2 F'F is often used for assembly, painting, and repair at high places such as highways and building construction, and lifts and lowers workers and materials onto this platform. I was letting them work. In this conventional elevating device, a pair of arms are pivoted at the center to form a set, and a pantograph-like expansion/contraction mechanism is used in which the plurality of arms are connected in the vertical direction (so-called noses type). With this mechanism, in order to increase the maximum lifting height of the lifting device, it was necessary to increase the length of each arm or to increase the number of sets of arms. For this reason, when designing a lifting device that can increase the height of the lift, multiple sets of pantographs must be used, and the height of the lifting device with the telescoping mechanism folded becomes high, making it difficult for workers to get on and off the platform. The work of loading and unloading materials was cumbersome. For this reason, a lifting device has been devised in which a plurality of booms are telescopically inserted into the inside of the arm so that one arm can be extended and contracted in its length direction (for example, Japanese Patent Application No. 134487 of 1982). No. 191065, etc.). In this newly proposed lifting device, two sets of booms are combined in an X-shape so that they can rotate freely at the center, two sets of boom bodies are arranged in parallel, and four upper and lower arms are connected to the vehicle body. It was connected to a lifting platform. Therefore, the number of booms required to be used increases, the number of constituent parts becomes extremely large, the manufacturing and assembly becomes complicated, and the price becomes high. In addition, the boom and arm have an extremely large number of sliding parts, and since sliding parts such as MC nylon are usually attached to these sliding surfaces, the number of parts that must be replaced periodically increases, resulting in inspection and maintenance. The cost was n0 and the work was troublesome. For this reason, an elevating device is also proposed (Patent Application No. 957 of 1982) in which the boom body is made into a single piece and expands and contracts to form a two-figure shape when viewed from the side.
97 etc.). This new elevating device using a single telescopic boom body has an extremely simple structure and is extremely easy to manufacture and maintain.

[Problem that the invention seeks to solve]

With this single boom, it is extremely easy to lift the platform upwards, but when working at heights, it is not only necessary to move the platform vertically (for example, when painting or repairing a wall, etc.) In many cases, it is necessary to bring the lifting platform close to the wall surface.In the conventional lifting device using a single telescoping boom body, it is necessary to move the lifting platform close to the wall surface. It was extremely easy to move the lifting platform towards the boom, and it was actually used.However, due to its structure, it was impossible to move the lifting platform in the left and right direction of the telescopic boom body. Even if you wanted to move the platform a little to the left and right of the side of the vehicle, you could not move it due to its structure, which was inconvenient for work. With the car body facing its length, move the lifting platform slightly horizontally toward one side of the car body, and move the car body straight with the lifting platform horizontally to enable painting on long walls, etc. It was not the same as work that involved continuous work at high places.

[Means for solving problems]

In the present invention, a movable vehicle body, a flat elevating platform placed above the vehicle body, and a plurality of booms disposed between the vehicle body and the elevating platform are slidable in the length direction to extend and retract. The lowermost boom of the telescopic boom body and the heavy body are moved in two directions in the lifting W position, which can raise and lower the lifting platform vertically by extending and contracting each boom of the telescopic boom body. (The uppermost boom of the telescopic boom body and the lifting platform can be swung in two directions.) The vehicle body and the lowermost boom of the telescopic boom body are A pair of hydraulic cylinders are interposed on the left and right, and a pair of hydraulic cylinders are interposed between the left and right of the uppermost boom of the telescopic boom body and the lifting platform, and the upper and lower hydraulic cylinders are located at alternate positions. The present invention provides an elevating device characterized in that an elevating platform is moved in the left-right direction with respect to a vehicle body by controlling only a hydraulic cylinder.

[Effect]

In the present invention, the lower boom and the upper boom of the telescopic boom body are connected to each other by a rocking connection means that can swing in two directions, so that the telescopic boom body can be bent in any direction relative to the vehicle body and the lifting platform. can do. For this reason, the lower boom and upper boom of the telescopic boom body are connected to each other.
By controlling the wooden hydraulic cylinder, the telescopic boom body is moved in the left and right direction relative to the vehicle body, and the lifting platform is reflected in the opposite direction to the direction in which it is moving, and as a result, the lifting platform is moved against the vehicle body. On the other hand, it can be moved horizontally in the left-right direction.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

A front wheel 2 and a rear wheel 3 are pivotally supported on the front, rear, left and right sides of the vehicle body 10, respectively, so that the vehicle body 1 can move freely.On the left and right sides of the vehicle body 10, there is a power supply box 4 that houses an engine, a hydraulic pump, etc. is the installation.

A thin semicircular shaft support piece 10 is protruded from one end of the upper surface of the vehicle body 1 (at the rear of the vehicle body 1), and this shaft support piece 1
0 is engaged with a connecting piece 11 bent in a U-shape from above, and the shaft support piece 10 and the connecting piece 11 are connected to the vehicle body l.
They are rotatably connected by a pin 12 that is parallel to the length direction. A connecting piece 13 that opens upward in a U-shape is placed on the upper surface of the connecting piece 11, and is positioned so that the opening axis of the connecting piece 11 and the opening axis of the connecting piece 13 are perpendicular to each other. It is. The base of the lower pool 15 of the telescopic boom body 6 is inserted into the U-shaped space of the connecting piece 13, and the lower pool 15 and the connecting piece 13 are connected to the pin 1.
4 and are rotatably connected. The pivoting connection means 5 is constituted by the shaft support piece 10, the connection piece IL 13, and the pins 12.14.

Next, the telescopic boom body 6 includes a lower boom 15, a middle boom 16,
It consists of a front boom 17. The tip of the lower boom 15 has a rectangular opening, and an internal hollow poom 16 with a rectangular cross section is freely inserted into this opening. An internal hollow tip poom 17 is slidably inserted therethrough. A cover unit 18 having a U-shaped cross section and an open bottom is fixed to the tip of the tip boom 17. A gap is formed between the pool 17 and the cover unit 18 such that the middle boom 16 and the lower boom 15 can be inserted therethrough. The lower boom 15 is set to have a length approximately equal to the total length of the vehicle body 1, and the middle boom 16 and tip boom 17 are also set to have approximately the same length as the vehicle body 1.
, a telescopic boom body 6 is formed by the front boom 17. Reference numeral 8 denotes a flat lifting platform having approximately the same floor area as the vehicle body 1, and a pair of shafts are installed at one end of the lower surface of the lifting platform 8 (at a position opposite to the shaft support piece 10) at a distance. A support piece 19 is projected, and a shaft support piece 20 is inserted between the shaft support pieces 19, and both shaft support pieces 19 and 20 are fixed by pins 21 in a direction perpendicular to the longitudinal direction of the lifting platform 8. It is connected so that it can swing. A connecting piece 22 that opens downward in a U-shape is fixed to the lower part of the shaft support piece 20, and the upper end of the cover unit 18 is inserted into the downwardly opening opening of this connecting piece 22. The connecting piece 22 and the cover unit 18 are rotatably connected by a pin 23. These shaft support pieces 19.20, connection pieces 22, and pins 21.2
3 forms a swinging connection means 7.

Next, near the center of the lower boom 15, an actuation bar 30 that is straight in a direction perpendicular to the length direction of the lower boom 15 is protruded left and right, and the left and right tips of the actuation bar 30 are A hydraulic cylinder 31.3 is installed between the
2 are respectively interposed 6 and hydraulic cylinder 3
The connecting part between 1.32, the operating bar 30, and the vehicle body l is a ball joint 33.3 that can rotate in the left and right direction.
connected by 4. Furthermore, an actuation bar 35 extending in a direction perpendicular to the length direction of the cover body 18 is protruded from the left and right sides approximately at the center of the lower surface of the cover body 18. Hydraulic cylinders 36 and 37 are interposed between the center and both sides. The hydraulic cylinders 36, 37 and the actuating bar 35 are swingably connected by a ball joint 38, and the lifting platform 8 and the hydraulic cylinders 36, 37 are similarly swingably connected by a ball joint 39. ing.

Note that a handrail 9 is attached around the upper surface of the lifting platform 8 to prevent the worker from falling.

Next, FIG. 5 shows the internal structure of the above-mentioned telescopic boom body 6, in which the lower boom 15, the middle boom 16, and the front boom 17 are inserted in a telescopic pink shape so that they can be extended and contracted. The cover unit 18 attached to the tip of the front boom 17 has an upper side that is about 2/3 of the total length of the lower boom 15 and a lower side that is about 1/3 of the length, and the left side in the figure is It is formed by cutting it diagonally. An operating bar 35 for connecting hydraulic cylinders 36 and 37 is attached to the upper part of the lower boom 15 at a position about ⅓ from the left end. Further, a shaft support 41 is fixed at the left end position of the upper part of the cover unit 18, and within this shaft support 41 there is a roller 42 that contacts the upper surface of the lower boom 15.
is a pivot support. The upper end of the pool 17 ahead (right side in the figure)
A sprocket wheel 43 is pivotally supported on the front boom 17, and a sprocket wheel 44 is also pivotally supported at a position about 1/3 of the length of the lower end of the front boom 17 (on the left side in the figure), and both sprocket wheels 43. Chain 45 between 44
is wound slowly, and each end of the chain 45 is attached to the middle boom 16.
It is connected near the upper end (position C on the right side in the figure).

And on the right side of this chain 45, there are about 10 MCs.
Rollers 46 as spacers made of a slippery material such as nylon are connected at intervals.

FIG. 6 shows a cross section taken along arrow A-A in FIG. A support shaft 51 is fixed to the lower part of the plate 50, and rollers 52 are mounted on the left and right sides of the support shaft 51, respectively, and the rollers 52 are in contact with the lower outer circumference of the front boom 17.
is rotatably supported, and in the center of the support shaft 51 is a chain (
A pulley 53 that rotates a motor (not shown) is a pivot support.

The auxiliary plate 50 also includes a slider 54 that contacts the outside of the front boom 17 and a slider 5 that contacts the inside of the cover unit 18.
5 is a provision. A pair of sprocket wheels 43 are pivotally supported by shaft pins 56 on the left and right sides of the upper inner wall of the front boom 17. A chain 45 is installed on the sprocket wheels 43, and a roller 46 is connected to each chain 45. It is.

Next, FIG. 7 shows a cross section taken along arrow B-B in FIG. It is stuck and
A pin 61 is installed between the side surface of the shaft support 41 and its support piece 60, and the roller 42 is supported pivotally on each pin 61. A liner 62 that comes into contact with the side surface of the lower boom 15 is fixed to the side surface of the cover unit 18.
A liner 63 that comes into contact with the outer periphery of the middle pool 16 is fixed to the inner pool 5 . A sprocket wheel 44 is pivotally supported on the lower inner wall of the front boom 17, and a chain 45 is wound around the sprocket wheel 44.

FIG. 8 shows an enlarged view of the vicinity of the sprocket wheel 43 on the left side in FIG.
The sprocket wheel 43 is pivotally supported on the sprocket wheel 43, and a chain 45 is wound around the sprocket wheel 43. Further, a rail 65 made of MC nylon or the like is fixed to the upper outer wall of the front boom 17 in parallel with the length direction of the front boom 17, so that the rollers of the chain 45 can be transferred to the upper surface of the rail 65. Let's make contact. L-shaped angle pieces 66 are connected to both sides of the chain 45, and a U-shaped shaft support 67 that opens upward is fixed between the angle pieces 66. The roller 46 is supported by a shaft 68 on the support body 67 .

Next, FIG. 9 shows the configuration of the hydraulic circuit in this embodiment.

The hydraulic pump 70 is driven by an engine 71, the suction side of the hydraulic pump 70 is connected to an oil tank 72, and the discharge side of the hydraulic pump 70 is connected to a three-way switching valve 73. One side of this switching valve 73 is connected to a solenoid valve 74, the output of which is connected to the extrusion side of the hydraulic cylinders 31, 32. This electromagnetic valve 74 has three ports, XSY and Z, and one port has two flow paths, which are branched from and connected to the switching valve 73. In this port Y, both channels are in communication; in port X, one channel is in communication and the other channel is closed, and in port Z, the arrangement is the opposite. Therefore, by switching the ports of the electromagnetic valve 74, it is possible to supply hydraulic pressure to the hydraulic cylinders 31 and 32 at the same time, or to switch the supply of hydraulic pressure by supplying hydraulic pressure to only one of them. The discharge side of the hydraulic cylinder 31 is connected to the extrusion side of the hydraulic cylinder 37, and the discharge side of the hydraulic cylinder 32 is connected to the extrusion side of the hydraulic cylinder 36. The respective discharge sides of the hydraulic cylinders 36 and 37 are T and J.
The two flow paths connected to the valve 75 and the solenoid valve 75 are combined into one and connected to the switching valve 73. This solenoid valve 75 also has three ports X, Y, and Z, and is made by Seizo, the same as the solenoid valve 74. Reference numeral 76 is a controller for controlling the vertical movement and left/right movement of the lifting platform 8. A lever 77 is protruded from this control device 76, and the lever 77 controls the vertical movement, left movement, and right movement. 3
The output of the controller 76 is connected to the respective control coil of the solenoid valve 74, 75.

Next, the operation of this embodiment will be explained.

<When moving the platform up and down> Figures 3 and 4 show the state in which the telescopic boom body 6 is contracted and the platform 8 is lowered to the lowest position. A worker gets on board, materials are placed thereon, and the lifting platform 8 is raised. In order to raise the elevator platform 8, the engine 71 in the IT source sheath box 4 is operated to generate oil pressure. In this case, the system? TO machine 7
The lever 77 of No. 6 is kept in the free-standing position, and each solenoid valve 7 is
The two channels of 4.75 are connected to each other. Then, by starting the engine 71, the hydraulic pump 7
0 is driven, and the flow direction of the hydraulic pressure generated by the hydraulic pump 70 is switched by the switching valve 73, and the hydraulic pressure is supplied to each hydraulic cylinder 31, 32, 36, and 37. Although not shown, there is also a hydraulic cylinder within the telescopic boom body 6, and this hydraulic cylinder is also supplied with hydraulic pressure. When hydraulic pressure is supplied to the hydraulic cylinder in the telescopic boom body 6 for telescoping, the middle boom 16 is slid and pulled out from the lower boom 15, and the tip pool 17 is slid and pulled out from the middle boom 16. This increases the spacing between pins 14 and 21. At the same time, the hydraulic cylinder 3 is also
Hydraulic cylinder 31.1.32 is supplied with hydraulic pressure.
32 is extended, the lower boom 15 is rotated about the pin 14, and the telescopic boom body 6 is lifted so as to be inclined with respect to the vehicle body 1. If the extension speed of the telescopic boom body 6 by the hydraulic cylinder housed in the telescopic boom body 6 and the tilting speed of the telescopic boom body 6 by the hydraulic cylinder 3132 are made the same, the pin z3 of the cover unit 18 will be perpendicular to the vehicle body l. It will rise to . Also, hydraulic cylinder 31.32
The hydraulic pressure discharged from the hydraulic cylinder 36.37 is simultaneously supplied to the hydraulic cylinder 36.37, so that the hydraulic cylinder 36.37 is extended.

Therefore, the lifting platform 8 rotates around the pin 23 due to the extension force of the hydraulic cylinders 36 and 37, and the cover unit 1
8 and the lifting platform 8. At this time, the hydraulic cylinders 32 and 36 are directly connected with oil passages, and the hydraulic cylinders 31 and 37 are directly connected with oil passages, so if the internal cross-sectional area is the same, each hydraulic The extension amount of the cylinders 31.32.36.37 is the same, and the 4-wood hydraulic cylinder 31.32.36
．． 37 will be synchronized. Therefore, the elevating platform 8 is always parallel to the vehicle body 1, and the vehicle body 1, the telescopic boom body 6, and the elevating platform 8 operate in a figure 7 shape when viewed from the side. Once the lifting platform 3 has risen to a predetermined height position, the worker stops the switching valve 73 and other switching valves, and the hydraulic cylinders 31, 32, 36, 37 and the hydraulic cylinders in the telescopic boom body 6 (not shown) are stopped. When the operation is stopped, the lifting platform 8 is held at that height position, and work such as assembly and painting can be performed at a high place.

During the telescoping operation of the telescoping boom body 6, the roller 42
will come into contact with the upper surface of the lower boom 15 and move while shifting. Since there is a gap between the cover unit 18, the lower boom 15, the middle boom 16, and the front boom 17, sliding may cause looseness, and there is a risk that the cover unit 18 may be deformed by the load. . In other words,
The load of the lifting platform 8 is transmitted to the operating bar 35 via the hydraulic cylinders 36 and 37, and the cover unit 18 is connected to the operating bar 35.
A stress that bends it downward will be applied. However, as mentioned above, since the roller 42 moves on the upper surface of the lower boom 15, the load is supported by the roller 42 and transmitted to the lower boom 15, so that the cover unit 18 is not deformed and the lifting platform is 8 is extended upward together with the front boom 17 while maintaining it at that height. If the lower boom 15 continues to move relative to the cover unit 18, the upper end of the lower boom 15 will eventually encounter the lower surface of the roller 42.
When this telescopic boom body 6 expands and contracts, the tip of the middle boom 16 is regulated by sliding away from the upper end of the front boom 17 as described above, so that the chain 45 is also regulated by the front boom 17.
Sprocket wheel pulled inside 43.44
Move while rotating. This chain 45 slides on the rail 65 and moves smoothly, and at the same time the roller 46 fixed to the chain 45 also follows. For this reason, chain 4
The lower roller 46 fixed to the middle boom 16 moves in the moving direction of the middle boom 16, and the lower roller 46 is fixed to the middle boom 16.
moves into the space formed between the front boom 17 and the cover unit 18, and the roller 46 rolls while contacting the inner wall of the cover unit 18, and the load applied to the cover unit 18 is transferred to the roller 46. , chain 45, and rail 65 to the upper surface of the front boom 17. In this way, even if the rollers 42 are separated from the upper surface of the lower boom 15, each roller 46 will bear the load applied to the cover unit 18, and the cover unit 18 will not be deformed by the load of the lifting platform 8.

FIG. 10(A) shows the initial state of expansion, in which the load applied to the actuating bar 35 is supported by the rollers 42.

Then, as the telescopic boom body 6 further expands and contracts, the lower boom 15 will be pulled out from the cover unit 18, and the rollers 42 will be separated from the upper surface of the lower boom 15 (see FIG. 9 (b)). , at this time, the middle boom 16
The roller 42 is pulled out between the front boom 17 and the cover unit 18, and the load applied to the actuating bar 35 is transmitted to the front boom 17 via the cover unit 18, rollers 46, etc. The spacing between the tip pools 17 is always kept parallel. Furthermore, when the middle boom 16 is pulled out and the distance between it and the tip of the front boom 17 increases, these rollers 46 are disposed at equal intervals between the front boom 17 and the cover unit 18 and are moved. are successively pulled out from the middle boom 16 and finally stop in the state shown in FIG. 10(c).

This state indicates the maximum extension position of the telescopic boom body 6. In this way, the rolling contact between the rollers 42 and 46 is switched, and the telescopic boom body 6 slides smoothly. Also, when the telescopic boom body 6 is contracted, it moves so that the front boom 17 is inserted into the middle boom 16, the chain 45 moves in the opposite direction to the above, and the rollers 46 are stored inside the front boom 17. It turns out.

Then, when the upper end of the lower boom 15 approaches the lower end of the cover unit 18, the roller 42 starts rolling on the upper surface of the lower boom 15. In this manner, when the telescopic boom body 6 is contracted, the load applied to the cover unit 18 is switched from the roller 46 to the roller 42 by operating in the order shown in FIGS.

<When moving the platform 8 horizontally to the left and right with respect to the vehicle body 1> As shown in Figures 1 and 2, extend the telescopic boom body 6 and lift the platform 8 to a high position relative to the vehicle body 1. When the platform 8 is moved horizontally to the left or right side in the side direction of the vehicle body 1 in this state, is there any restriction? Switch the lever 77 of the FF1 machine 76 from the horizontal position to the position in the moving direction. Then, control signals N and /it flow from the controller 76, respectively switching the solenoid valves 74 and 75 to cut off one of the two oil passages. For example, when it is desired to move to the left, the solenoid valve 74.75 is operated to set port Z, the oil passage of the hydraulic cylinder 31.37 is cut off, and hydraulic pressure is supplied only to the hydraulic cylinder 32.36. After this, when the switching valve 73 is operated and hydraulic pressure is supplied, the hydraulic cylinder 3
The expanded length of 1.37 is kept at the same length,
Hydraulic pressure is supplied to hydraulic cylinders 32 and 36 causing hydraulic cylinders 32,36 to extend their length. When the hydraulic cylinder 32 extends, it pushes up the actuating bar 30 and applies a force that twists the telescopic boom body 6 so as to face diagonally with respect to the vehicle body 1. Since the base of the telescopic boom body 6 is connected by the swinging connection means 5, the telescopic boom body 6 can freely rotate in two perpendicular directions about the pin 12.14. 14, and the telescopic boom body 6 can be tilted in a diagonally twisted direction with respect to the vehicle body 1. At the same time, the hydraulic cylinder 36 also extends, exerting a pushing force on the operating bar 35, and acting to rotate the lifting platform 8 connected to the telescopic boom body 6 in an oblique direction. Since the twisting direction of the lifting platform 8 is opposite to the twisting direction of the telescopic boom body 6 acted on by the hydraulic cylinder 32, the side surface of the lifting platform 8 is parallel to the length direction of the vehicle body 1, and the telescopic boom Even if the body 6 is tilted diagonally, the elevator platform 8 can be moved horizontally while remaining parallel to the vehicle body 1.

Once it has been moved horizontally to a predetermined position, the switching valve 73
By closing the hydraulic cylinders 32 and 36, the extended length is maintained at that length position, and the lifting platform 8 is moved horizontally to the left with respect to the vehicle body l, as shown in FIG. be stopped. In this state, by driving the wheels 2.3, the vehicle body l moves parallel to the building, etc., and the side of the platform 8 can move in a straight line while remaining close to the wall, etc., and is placed at a high position. The extended side of a building can be continuously used for repair or painting work.

In addition, in order to return the telescopic boom body 6 from the diagonally inclined state as shown by the solid line in FIG. Direct the supplied hydraulic pressure in the opposite direction to the hydraulic cylinder 32.3.
Reduce the length of 6. This allows the actuation bar 30.3
The diagonal force applied to 5 is gradually returned to its original state, and the lifting platform 8 returns from the position shown by the solid line to the position shown by the broken line in FIG. Once it has returned to its initial position, the controller 76 operates the solenoid valves 74, 75 to connect the two oil passages to the hydraulic cylinders 31, 32, 36, 37, respectively, and then the robot moves up and down as shown in the previous example. The platform 8 can be vertically moved up and down relative to the vehicle body 1.

〔effect〕

Since the present invention is constructed as described above, in the past it was possible to move the lifting platform up and down only in the vertical direction, but in this invention, the lifting platform can be moved horizontally from side to side in a direction perpendicular to the length direction of the vehicle body. Since it can be moved over a long distance, it is very effective when working with the lifting platform close to the side of a building that is located a long distance away. Since the vehicle body can be moved along the length of the building while the workbench is close to the building, repairs can be made in a short period of time while the lifting platform approaches the building. This type of work involves work at heights, such as painting and painting.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a side view showing the same lifting platform raised to the maximum height position, and Fig. 3 is a lowering of the lifting platform to the lowest position. 4 is a front view of the same as above, FIG. 5 is a side view showing the internal structure of the telescopic boom body, FIG. 6 is a cross-sectional view taken along arrow A-A in FIG. Figure 7 is a sectional view taken along arrows B-B in No. 50, Figure 8 is an enlarged sectional view showing the vicinity of the roller wrapped around the front boom, Figure 9 is a piping diagram showing the hydraulic control system, and Figure 10 is An explanatory diagram showing the operation of the telescopic boom body, and FIG. 11 is a front view showing a state in which the lifting platform is moved in the side direction. DESCRIPTION OF SYMBOLS 1... Vehicle body, 5.7... Rocking connection means, 6... Telescopic boom body, 8... Lifting platform, 15... Lower pool, 1
6... Middle boom, 17... Front boom, 31.32.
36.37...Hydraulic cylinder. Figure 1 Figure 2 Figure 3? Figure 4 Figure 6 Figure 8

Claims (1)

[Claims] It consists of a movable vehicle body, a flat lifting platform placed above the vehicle body, and a telescoping boom body that is arranged between the vehicle body and the lifting platform and can extend and contract by sliding a plurality of booms in the length direction. In a lifting device that can raise and lower a lifting platform vertically by extending and contracting each boom of a telescoping boom body, a rocking device that can swing the lowest boom of the telescoping boom body and the vehicle body in two directions. The uppermost boom of the telescopic boom body and the lifting platform are connected by a swinging connecting means that can swing in two directions, and a pair of hydraulic with a cylinder interposed,
A pair of hydraulic cylinders is interposed between the left and right of the uppermost boom of the telescopic boom body and the lifting platform, and by controlling only the hydraulic cylinders at alternate positions among the upper and lower hydraulic cylinders, the lifting platform can be moved. A lifting device that moves in the left and right directions relative to the vehicle body.