JPH0227276B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lifting device that can lift personnel and materials to a high place by moving a lifting platform upward and downward above a vehicle body. This invention relates to a lifting device that can be lowered to near the top, thereby making it easier for people to board and transport materials.

[Conventional technology]

Lifting devices that raise and lower platforms are often used for assembly, painting, and repairs at high places such as highways and building construction. was.

In this conventional lifting device, a pair of arms are pivoted at the center to form one set, and a pandagraph-like extension and contraction mechanism is used in which multiple sets of arms are connected in the vertical direction (so-called scissor type).
In 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 connecting 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 increases, making it difficult for workers to get on and off the platform. The work of loading and unloading materials was cumbersome.

For this reason, an elevating device has also been proposed in which multiple booms are telescopically inserted into the center of the arm so that one arm can extend and contract in its length direction (Japanese Patent Laid-Open No. 58-36900, Kaisho 58-95100, etc.). In this newly proposed lifting mechanism, 2 pieces 1
Two sets of booms were assembled in an X-shape so that they could rotate freely at the center, two sets of boom bodies were arranged in parallel, and the vehicle body and lifting platform were connected by four upper and lower arms. For this reason, the number of booms required increases, the number of component parts becomes extremely large, the manufacturing and assembly becomes complicated, and the cost becomes high.

In addition, the boom and arm have an extremely large number of sliding parts, and since sliding parts such as MC nylon (registered trademark) are usually attached to these sliding points, the number of parts that need to be replaced regularly increases, resulting in inspections and Maintenance was expensive and the work was troublesome. For this reason, an elevating device has been devised in which the boom is made into a single piece and extends and retracts to form a Z-shape when viewed from the side (Japanese Patent Laid-Open No. 60-242199, etc.). This new lifting device with a single boom body has fewer parts and can perform the same functions as conventional lifting devices, but the boom body is connected near the center of the vehicle body and the lifting platform. Therefore, the elevator platform is located at a certain height above the ground, and the height when the elevator platform is lowered to its lowest position is still high. Therefore, in order for workers to get on and off the platform, they must use a stepladder or a ladder to get on and off the platform, making the work extremely complicated.

[Problem that the invention seeks to solve]

If you try to lift the platform with a single boom, the boom must be interposed between the center of the top surface of the vehicle body and the center of the bottom surface of the platform, and the height of this single boom is the maximum height of the platform. This caused the lower position to be higher.

[Means to solve the problem]

The present invention consists of a movable vehicle body, a flat lifting platform located above the vehicle body that moves up and down, and a pair of telescopic boom bodies that can extend and contract by combining a plurality of booms in a telescopic manner. The base booms of each telescoping boom body are connected so that they can be pushed down, and the booms at the tip of each telescoping boom body are connected to both sides of the front of the platform so that they can be opened and moved, forming a Z-shape when viewed from the side. In the elevating device configured as above, a hydraulic cylinder for suppressing depression is interposed between the base boom and the vehicle body, located outside each of the telescoping boom bodies, and a hydraulic cylinder is located between the elevating platform and the telescoping boom body. , a hydraulic cylinder for angle correction is interposed between the boom at the tip and the lifting platform, a hydraulic cylinder for suppressing downward movement from the side, a telescopic boom body,
The present invention provides an elevating device characterized in that a hydraulic cylinder for angle correction and an elevating platform are arranged in this order.

[Effect]

When the telescoping boom bodies provided on both sides of the vehicle body are extended, the telescopic booms slide and become longer, and the lifting platform is lifted upward relative to the vehicle body. By this operation, the elevator platform can be lifted above the vehicle body and ascend. Simultaneously with the extension of this telescopic boom body, the hydraulic cylinder for depression suppression extends.
The telescopic boom body is held down from the horizontal. Also,
The hydraulic cylinder for angle correction also extends, expanding the opening angle of the telescoping boom body and the lifting platform, and controlling the vehicle body so that the lifting platform is parallel.

Further, since hydraulic cylinders are arranged on the left and right sides of the telescopic boom body, even when the elevator platform is lowered, it does not come into contact with the telescopic boom body. For this reason, when lowering the platform close to the ground, extend the telescopic boom bodies on both sides a little longer and reduce the hydraulic cylinders that hold down each telescopic boom body, so that the platform can be lowered until it touches the ground. Can be done.
This makes it extremely easy to load workers and transport materials.

〔Example〕

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

There are front wheels 2 and rear wheels 3 on the front, rear, left and right sides of the vehicle body 1, respectively.
is pivotally supported, so that the vehicle body 1 can move freely, and a power source box 4 containing an engine, a hydraulic pump, etc. is attached to the lower part of the vehicle body 1.

The bases of a first telescopic boom body 6 and a second telescopic boom body 6 are connected to both rear sides of the vehicle body 1 so as to be freely openable. To connect these two, shaft support pieces 7 and 8 are fixed to both sides of the rear of the vehicle body 1 in the shape of a U-shape that protrudes to the left and right slightly beyond the width of the vehicle body 1 and opens upward. 7,8
Lower booms 9 and 10 as base booms having a hollow interior with a rectangular cross section are inserted between the openings, and the shaft support piece 7 and the lower boom 9 are rotatably connected by a pin 11. The shaft support piece 8 and the lower boom 10 are rotatably connected by a pin 12. Further, L-shaped cylinder receivers 13 and 14 are fixed to the lower surface of the slightly front side of the vehicle body 1, and project from the left and right. Hydraulic cylinders 15 and 16 are interposed for suppression.

The tips of the lower booms 9 and 10 have square openings, and hollow booms 17 and 18 having a square cross section are slidably inserted into these openings. Similarly, tip booms 19 and 20, each having a square cross section and a hollow interior, are slidably inserted thereinto. This lower boom 9, 10, middle boom 17, 18, front boom 19,
20 form a telescopic combination and form telescopic boom bodies 5, 6.

In addition, each tip boom 19 as a tip boom,
Cover bodies 21 and 22, each having a U-shaped cross section and opening downward, are fixed to the tips of the booms 20, and on the inner surfaces of the upper parts of the cover bodies 21 and 22, parallel to the outside of the lower booms 9 and 10 are fixed. A gap is formed between the front booms 19, 20 and the cover bodies 21, 22, such that the lower booms 9, 10 can be inserted therethrough. The lower booms 9 and 10 are each set to approximately the same length as the vehicle body 1, and the middle booms 17 and 18 and the front booms 19 and 20 are each set to approximately the same length as the vehicle body 1. Telescopic boom bodies 5 and 6 are formed by lower booms 9 and 10, middle booms 17 and 18, front booms 19 and 20, and cover bodies 21 and 22, respectively.

In this figure, reference numeral 23 denotes a flat-shaped lifting platform having almost the same floor area as the vehicle body 1, and U-shaped shafts opening downward are provided on the left and right sides of the front side of the lifting platform 23, respectively. Support pieces 24 and 25 are fixed, and a cover 2 is attached to the opening of both shaft support pieces 24 and 25.
The tips of 1 and 22 are inserted, and the shaft support pieces 24 and 2
5 and the cover bodies 21 and 22 have pins 26 and 22, respectively.
They are rotatably connected by 27. Cylinder receivers 28 and 29 are fixed to the slightly rear side surface of the upper surface of the lifting platform 23.
A hydraulic cylinder 30 for angle correction is interposed between 8 and the slightly center of the inner surface of the cover body 21, and a hydraulic cylinder 31 for angle correction is interposed between the cylinder receiver 29 and the slightly center of the inner surface of the cover body 22. is interposed. A handrail 32 is installed around the upper surface of the elevator platform 23.

FIG. 5 shows the internal structure of the telescopic boom body 5 of the aforementioned telescopic boom bodies 5 and 6. Since the telescopic boom bodies 5 and 6 have the same structure, FIG. The configuration of the boom body 5 is shown.

Here, lower boom 9, middle boom 17, front boom 1
9 are inserted telescopically so that they can be expanded and contracted. The cover body 21 attached to the tip of the front boom 19 has an upper side that is about 2/3 of the total length of the lower boom 9, a lower side that is about 1/3, and the left side in the figure is cut diagonally. It is formed into a shape. A pin hole 35 for connecting the hydraulic cylinder 15 is provided at the upper part of the lower boom 9 at a position approximately 1/3 from the left end, and a pin hole 35 for connecting the hydraulic cylinder 15 is provided at the lower part of the cover 21 at a position approximately 1/3 from the left end. A pin hole 36 for directly connecting the hydraulic cylinder 30 is formed at the position.

Further, a shaft support 37 is fixed to the upper part of the cover body 21 and on the left side thereof, and a roller 38 that contacts the upper surface of the lower boom 9 is pivotally supported within the shaft support 37. At the upper end of the boom 19 (on the right side in Fig. 5) is a sprocket wheel 41.
A sprocket wheel 42 is also pivotally supported at a position about 1/3 from the lower end of the front boom 19 (on the right side in the figure), and a chain 43 is installed between both sprocket wheels 41 and 42. is wound around, and each end of this chain 43 is connected near the upper end of the middle boom 17 (position C on the right side in the figure). On the right side of this chain 43, about 10 rollers 44 as spacers made of a slippery material such as MC nylon are connected at intervals.

FIG. 6 shows a cross section taken along line A-A in FIG.
A support shaft 48 is fixed to the lower part of the boom 6, and rollers 49 that come into contact with the lower outer circumferential surface of the front boom 19 are rotatably supported on the left and right sides between the auxiliary plates 46, respectively. A pulley 50 for rolling a chain (not shown) connecting the lower boom 9 and the front boom 19 is pivotally supported at the center of the support shaft 48 . Further, the auxiliary plate 46 is provided with a slider 51 that comes into contact with the outside of the front boom 19 and a slider 52 that comes into contact with the inner surface of the cover body 21. A pair of sprocket wheels 41 are supported by a shaft 45 on the upper part of the inner wall of the front boom 19.
This sprocket wheel 41 has a chain 43.
are arranged at intervals, and a roller 44 is connected to each chain 43.

Next, FIG. 7 shows a cross section taken along line BB in FIG.
A support piece 53 is fixed inside the shaft support 37 parallel to the side surface, and a pin 54 is installed between the side surface of the shaft support 37 and this support piece 53, and each pin 54 has the roller 38 attached to the shaft. It is supported. A liner 5 that comes into contact with the side of the lower boom 9 is provided on the side of the cover 21.
5 is fixed, and the middle boom 17 is attached to the lower boom 9.
A liner 56 is fixedly attached to the outer periphery of the holder.
Sprocket wheels 42 are each pivotally supported on the lower inner wall of the tip boom 19,
This sprocket wheel 42 has a chain 43.
is rewound.

FIG. 8 shows an enlarged view of the vicinity of the sprocket wheel 41 on the left side in FIG. A sprocket wheel 41 is pivotally supported, and a chain 43 is wound around the sprocket wheel 41. Furthermore, a rail 57 made of MC nylon or the like is fixed to the upper surface of the front boom 19 in parallel with the length direction of the front boom 19, so that the rollers of the chain 43 can roll on the upper surface of the rail 57. has been brought into contact with. L-shaped angle pieces 58 are connected to both sides of the chain 43, and a U-shaped shaft support 59 that opens upward is fixed between the angle pieces 58. The roller 44 is supported on the body 59 by a shaft 60.

Next, the operation of this embodiment will be explained.

Figures 2 and 3 show the state in which the telescopic boom bodies 5 and 6 are contracted and the elevator 23 is lowered to the lowest position.In this state, a worker gets on the elevator platform 23 and materials are loaded. The lifting platform 23 is then raised.

To raise the lifting platform 23, the engine in the power supply box 4 is operated to generate hydraulic pressure, and the hydraulic pressure for expansion and contraction stored in each hydraulic cylinder 15, 16, 30, 31 and lower boom 9, 10 is used. This is done by supplying hydraulic pressure to each cylinder (not shown). When hydraulic pressure is supplied to the hydraulic cylinder for expansion and contraction, the middle booms 17 and 18 are moved to the lower booms 9 and 1.
Slide it out from 0 and pull out the tip boom 1.
9, 20 from the middle booms 17, 18 and pull them out, between pins 11 and 26 and between pins 12 and 27.
Increase the distance between.

In addition, by extending the hydraulic cylinders 15 and 16, the lower booms 9 and 1 are moved around the pins 11 and 12.
0 upward, and the telescopic boom body 5,
6 are each lifted up so as to be inclined with respect to the vehicle body 1. By synchronizing the extension speed of the telescopic boom bodies 5, 6 by the hydraulic cylinders housed in the lower booms 9, 10 and the tilting speed of the telescopic boom bodies 5, 6 by the hydraulic cylinders 15, 16, the cover body 21,
The 22 pins 26 and 27 each rise perpendicularly to the plane of the vehicle body 1. In addition, hydraulic cylinder 3
0 and 31 are extended, the elevating table 23 rotates around the pins 26 and 27 due to the elongation force, acting to enlarge the angle between the cover bodies 21 and 22 and the elevating table 23, and the hydraulic cylinder 15 , 16 and the extension amounts of the hydraulic cylinders 30 and 31, the lifting platform 23 becomes parallel to the vehicle body 1, and the vehicle body 1, the telescopic boom bodies 5 and 6, and the lifting platform 23 form a Z-shape when viewed from the side. It is formed like this. Lifting platform 2
3 has risen to a predetermined height position, the operator stops the operation of each hydraulic cylinder 15, 16, 30, 31 and the hydraulic cylinder in the lower boom 9, 10, and the lifting platform 23 returns to that height position. It is possible to carry out assembly, repair and painting work at height.

During the telescopic operation of the telescopic boom bodies 5 and 6, the roller 38 comes into contact with the upper surface of the lower boom 9 and moves while rolling. This cover body 21, lower boom 9, middle boom 17, front boom 19
Since there is a gap between them, there is a risk of rattling and deformation due to the load, but the load of the lifting platform 23 is transmitted to the pin hole 22 via the hydraulic cylinder 30, and the cover body 21 A stress is applied to the pin hole 36 to bend it downward. However, as mentioned above, since the roller 38 is rolling on the upper surface of the lower boom 9,
The load is supported by this roller 38 and the lower boom 9
Since the cover body 21 is not deformed and the lifting platform 23 is maintained at the same height, the cover body 21 extends upward together with the front boom 19. If the lower boom 9 continues to move relative to the cover body 21, the upper end of the lower boom 9 will eventually pass the lower surface of the roller 38, but when the telescoping boom body 5 expands and contracts, the middle boom 17 The tip of the chain 43 slides away from the upper end of the front boom 19 and is pulled out, so that the chain 43 is pulled out from inside the front boom 19 and rolls while rotating the sprocket wheels 41 and 42.

Since this chain 43 rolls on the rail 57, it moves smoothly, and at the same time, the roller 44 fixed to the chain 43 also follows. Therefore, each roller 44 fixed to the chain 43 is also moved along with the middle boom 17 in the moving direction of the middle boom 17, and the rollers 44 move into the space formed between the front boom 19 and the cover body 21. The roller 44 rolls while contacting the inner wall of the cover body 21, and the load applied to the cover body 21 is transmitted to the upper surface of the front boom 19 via the roller 44, the chain 43, and the rail 57. That will happen. In this way, even if the rollers 38 are separated from the lower boom 9, the load on the cover 21 remains on each roller 4.
4 will come into contact with each other, and the cover body 21 will not be deformed by the load of the lifting platform 23.

FIG. 9A shows the initial state of elongation, where the load applied to the pin hole 36 is supported by the roller 38. When the extension operation of the telescopic boom body 5 further progresses, the lower boom 9 will be pulled out from the cover body 21, and the roller 38 will be separated from the upper surface of the lower boom 9 (see Fig. 9). The roller 44 has already been moved by the middle boom 17.
is pulled out between the front boom 19 and the cover body 21, the load applied to the pin hole 36 is transmitted to the cover body 21 via the roller 44, and the distance between the cover body 21 and the front boom 19 is maintained parallel. be done.

Furthermore, the middle boom 17 is pulled out and the front boom 19
When the distance between the tip of the tip of the boom 19 and the cover body 21 increases, these rollers 44 are arranged at equal intervals between the tip of the boom 19 and the cover body 21 and roll.
are successively pulled out from the middle boom 17 and finally stop in the state shown in FIG. 9C, and this state is the maximum extension position of the telescopic boom body 5. In this way the roller 38
The contact rolling of the rollers 44 is switched, and the telescopic boom body 5 slides smoothly. Further, when the telescopic boom body 15 is contracted, it moves so that the front boom 19 is inserted into the middle boom 17, the chain 43 moves in the opposite direction to the above, and the roller 44 moves so that the front boom 19 is inserted. The chain 43 moves in the opposite direction to the above, and the roller 44
will be stored in the front boom 19. When the upper end of the lower boom 9 approaches the lower end of the vehicle body 21, the rollers 38 begin to roll on the upper surface of the lower boom 9. In this way, when the telescopic boom body 5 is contracted, the load applied to the cover body 21 is transmitted from the roller 44 to the roller 38 by operating in the order of FIG.

In this embodiment, the roller 44 as a spacer is formed into a cylindrical shape, but the spacer can have the same effect even if it is square or polygonal as long as it fills the gap between the cover body 21 and the front boom 19. Needless to say, it can be achieved.

Next, FIG. 10 shows the state in which the lifting platform 23 has been lowered to near the ground.

In this case, the telescopic boom 5 is extended to a predetermined length, the hydraulic cylinders 15 and 16 are contracted,
The lower booms 9 and 10 are swung downwards about the pins 11 and 12 to bring down the telescopic boom body 5,
At the same time, the hydraulic cylinders 30 and 31 are contracted in synchronization with the hydraulic cylinders 15 and 16 to maintain the level of the elevator platform 23. For this reason, the lifting platform 23
It can be located forward of the tip of the vehicle body 1 and at a height that is the same as or less than the height of the vehicle body 1.

This allows the lifting platform 23 to approach the surface of the ground, allowing the worker to board the lifting platform 23 directly from the ground without having to climb up from the vehicle body 1. In order to place materials on the lifting table 23, they can be transferred from the ground to the lifting table 23 in this state. When the worker gets on board and the materials are placed, the hydraulic cylinders 15 and 16 are extended and the telescopic boom bodies 5 and 6 are lifted counterclockwise in FIG. 10, thereby moving the lifting platform 23 upward. Can be done.
Since the lifting platform 23 is leveled by the position of the hydraulic cylinder 33, there is no need for the workers and materials on board to fall.

〔Effect of the invention〕

Since the present invention is constructed as described above, it is possible to lift the lifting platform upward, which is approximately the same size as the vehicle body and has a large floor area.Moreover, since the lifting platform is held by a pair of telescopic boom bodies on the left and right sides,
The platform can be moved to the front of the vehicle body and positioned lower than the height of the vehicle body, making it extremely easy for workers to board and to load and unload materials.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a side view showing the lifting platform lowered to the lowest position, Figure 3 is a front view of the same as above, Figure 4 is a side view showing the lifting platform extended to the highest position, and Figure 5 is the telescopic boom. A side view showing the internal structure of the body, FIG. 6 is a sectional view taken along line AA in FIG. 5, and FIG.
Figure 8 is an enlarged cross-sectional view showing the vicinity of the roller attached to the front boom, Figure 9 is an explanatory diagram showing the operation of the telescopic boom body, Figure 10 is a cross-sectional view of the lifting platform below the height of the vehicle body. FIG. 1... Vehicle body, 5, 6... Telescopic boom body, 9, 10...
Lower boom as base boom, 17, 18... Middle boom, 19, 20... Tip boom as tip boom, 21, 22... Cover body, 23... Lifting platform, 1
5, 16, 30, 31...hydraulic cylinder.

Claims (1)

[Claims] 1. Consists of a movable vehicle body, a flat lifting platform located above the vehicle body that moves up and down, and a pair of telescopic boom bodies that can extend and contract by combining a plurality of booms in a telescopic manner. The base booms of each telescoping boom body are connected to both sides of the rear part so that they can be tilted down, and the booms at the tip of each telescoping boom body are connected to both sides of the front part of the lifting platform so that they can be freely opened. In the elevating device configured to be shaped like a letter, a hydraulic cylinder for suppressing depression is interposed between the base boom and the vehicle body, located outside each of the telescoping boom bodies, and a hydraulic cylinder is provided between the elevating platform and the telescoping boom body. A hydraulic cylinder for angle correction is interposed between the boom at the tip and the lifting platform, and the hydraulic cylinder for downward pressure suppression, the telescopic boom body, the hydraulic cylinder for angle correction, and the lifting platform are arranged in this order from the side. A lifting device featuring: