JPH0147399B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is an elevating device for use at work sites such as construction and construction, and has two elevating platforms, upper and lower, so that each elevating platform can be The present invention relates to a lifting device on which a worker can be placed to carry out work.

[Conventional technology]

Assembly at high places such as highways and building construction,
For painting and repairs, a lifting device was used to raise and lower a lifting platform, and workers and materials were placed on this lifting platform and lifted and lowered. This elevating device has a type that moves the elevating platform up and down using a pantograph-like link, and a pair of X-shaped booms each has an arm that can be extended and retracted from the end of the boom. Many models were used that moved the turret up and down. However, this elevating table (platform) is a one-step flat platform, and the height of the elevating table is adjusted according to the position where work is to be performed. For this reason, if there are many work areas, the number of times the height positioning of the lifting platform must be adjusted increases.

[Problem that the invention seeks to solve]

All conventional elevating devices have one level of elevating platform.For example, when attaching a panel to the side wall of a building, it is more efficient to screw the top and bottom together at once, and when painting, the part to be painted is both the top and bottom. Because of the narrow area, the work had to be continued by moving the lifting platform either up or down for each area to be coated. For this reason, by making the lifting platform into two levels (upper and lower), it is possible to place workers and materials on both the upper and lower platforms, and by having workers work together on the upper and lower levels, it is possible to place workers and materials on both the upper and lower platforms. It is possible to eliminate the drawbacks caused by the lifting platform. However, fixedly assembling a two-stage lifting platform increases the height even when the lifting mechanism is lowered, making it difficult to move. In the case of the prefabricated structure in which the elevating platforms are stacked, the second elevating platform must be lifted using a crane or the like, which is a cumbersome task.

[Means to try to solve problems]

In order to eliminate the above-mentioned drawbacks, the present invention relates to an elevating device that can assemble two elevating platforms vertically at intervals by its own function by utilizing the vertical movement force of the elevating mechanism. In this invention, the first-stage lifting platform is connected to the lifting mechanism, the second-level lifting platform is placed on the first-level lifting platform, and the vehicle body and the side of each lifting platform are provided with holders and locks, respectively. The fixtures and connectors are fixed, and each metal fixture is configured to hold and connect the pillars.

[Effect]

First, extend the elevating mechanism to lift the two elevating platforms upwards, insert the support between the coupling of the second elevating platform and the receiver on the vehicle body, then lower the elevating mechanism and lift the two elevating platforms upward. The first platform is left at a height supported by a support, and only the first platform is lowered. The connecting tool of this first-stage lifting platform is connected to a support, and the lifting platform can be assembled using the support with a vertical interval.

〔Example〕

1 to 3 show the external appearance of this embodiment. Front wheels 2 and rear wheels 3 are pivotally supported on the front, rear, left and right sides of a vehicle body 1 to which an engine and hydraulic equipment are fixed, respectively. An elevating mechanism 4 is placed on the top surface, a first elevating table 5 is connected to the upper part of the elevating mechanism 4, and a second elevating table 6 is placed on this elevating table 5. There are handrails 7 around the elevator platform 6.
is erected and fixed. The elevating mechanism 4 consists of four sets of telescopic booms, and each set of telescopic booms includes a middle boom 8, a lower boom 9, and an upper boom 1.
It is composed of 0. The centers of the two middle booms 8 are connected by a connecting shaft 11 so as to be rotatable in an X-shape, and the lower booms 9 and upper booms 10 each have connecting pieces 12 and 13 at their ends. are fixed to each other, and the connecting piece 12 is rotatably connected to a fixed piece 14 fixed on the vehicle body 1 by a pin, and the connecting piece 13 is connected to a fixed piece 15 fixed to the lower surface of the elevator platform 5 by a pin. They are rotatably connected. The intervals between the fixed pieces 14 and the fixed pieces 15 are both the same, and the vehicle body 1 and the lifting platform 5 are configured to be parallel even if the telescopic boom is extended in an X-shape. Two sets of the middle booms 8 are arranged in parallel with an interval between them, and the inner middle boom 8 of each set is connected to its center by an operating shaft 16, and the middle boom 8 is connected to its center by an operating shaft 16. The axes of the shaft 16 and the connecting shaft 11 are aligned. A pair of hydraulic cylinders 17 are arranged between both positions close to the fixed piece 14 of the vehicle body 1 and the operating shaft 16, and both hydraulic cylinders 17 are arranged to form an isosceles triangle with the operating shaft 16 as the apex. It has been done. Receptacles 45 with flat top surfaces are fixed to the left and right sides of the front and rear sides of the vehicle body 1, respectively, and engagement tools 46 that penetrate vertically to the left and right sides of the front and rear sides of the first stage elevating platform 5, respectively.
is fixed, and there are connectors 47 on the front and rear sides of the second stage lifting platform 6, each of which is open at the bottom.
is fixed.

Next, Figures 4 and 5 show the internal structure of the above-mentioned telescopic boom, that is, the middle boom 8. The middle boom 8 is made by bending a thin steel plate and having a hollow cross-section in the length direction. A lower boom 9 is slidably inserted through one end of the middle boom 8. The lower boom 9 has a hollow cross-section made by bending a thin steel plate, and the upper boom 10 inserted from the other open end of the middle boom 8 is slidably inserted into the lower boom 9. There is. Fan-shaped shaft support pieces 20 and 21 are fixed to both ends of the middle boom 8, respectively, and a pair of guide rollers 22 and 23 are rotatably supported on the shaft support pieces 20 and 21, respectively. The guide rollers 22 are in contact with both side surfaces of the lower boom 9, and the guide rollers 23 are in contact with both side surfaces of the upper boom 10. Further, the shaft support pieces 20, 21
pinions 24 and 25 are respectively pivotally supported in parallel with guide rollers 22 and 23, and racks 26 and 27 are fixed to the sides of the lower boom 9 and upper boom 10 so as to be parallel to the axial direction. , the rack 26 is meshed with the pinion 24, and the rack 27 is meshed with the pinion 25.

FIG. 5 shows a cross section taken along the line A-A in FIG. A pinion 24 that meshes with a rack 26 is fixed to the center of the drive shaft 28. This pinion 2
A collar 29 is inserted through each drive shaft 28 between the drive shaft 4 and the shaft support piece 20, and a sprocket wheel 30 is fixed to the end of the drive shaft 28.

Further, FIG. 6 shows a cross section of the center of the middle boom 9, and a band-shaped holder 31 is wrapped around and fixed to the outer periphery of the center of the middle boom 8. is a cylindrical connecting shaft 1
1 is fixed, and the other holder 31 has a screw 3.
The engaging piece 33 fixed at 2 is fixed, and the engaging piece 33 is fitted into an engaging groove 34 formed on the outer periphery of the connecting shaft 11. As a result, the two middle booms 8 are connected in an X-shape, and their rotation is maintained freely. A control ring 35 is rotatably inserted through the outer periphery of the connecting shaft 11, and a pair of sprocket wheels 36 are fixed to the outer periphery of the control ring 35. Further, a support shaft 37 is protruded from the side opposite to the connection shaft 11 of the holder 31 of one of the middle booms 8, and the operating shaft 16 is connected to the support shaft 37.

Next, FIG. 7 shows the synchronization mechanism of this embodiment, in which an endless chain 38 is wound between a pair of sprocket wheels 30.
The inner peripheral surface of 8 is engaged with the upper and lower surfaces of the sprocket wheel 36, respectively, and the sprocket wheels 30, 36, the drive shaft 28, the pinions 24, 25
Both will rotate synchronously. Also,
Chain 3 is located on the left and right side of sprocket wheel 36.
sprocket wheel 36 in contact with the outer circumference of sprocket wheel 36.
Tension gears 39 and 40 are pivotally supported to ensure that the chain 38 meshes with the chain 38.

FIG. 8 is a detailed explanation of the above-mentioned catch 45, engagement tool 46, and coupling tool 47. It is fixed to. Engagement tool 46
is formed by bending a steel plate into a U-shape, and is attached to the lifting platform 5 with the through openings facing up and down, and a pin hole 48 is opened in the side of the engaging tool 46. There is a long pin 4 in this pin hole 48.
9 is removable. And the connector 47
has a hollow shape with its top closed and opened only downward, and is fixed to the lifting platform 6 with the opening facing downward, and has pin holes 5 on its side.
0 is a through opening, and a long pin 51 can be freely inserted into and removed from this pin hole 50. The receiving tool 45, the engaging tool 46, and the connecting tool 47 are vertically arranged. Reference numeral 52 denotes a support for assembling the two lifting platforms 5 and 6 at a distance, and the outer diameter of this support 52 is set to be slightly smaller than the cross section of the opening of the engaging tool 46 and the connecting tool 47. , its length is set to be longer than the distance between the two lifting platforms 5 and 6 after they are assembled.

Operation of Lifting Mechanism 4 First, an engine (not shown) attached to the vehicle body 1 is operated, and the engine drives a hydraulic mechanism to generate hydraulic pressure, and this hydraulic pressure is applied to each hydraulic cylinder 17.
be supplied to Therefore, the hydraulic cylinder 17 extends in its length direction and acts to pull out the lower boom 9 and the upper boom 10 from the middle boom 8. At this time, the racks 26 and 27 fixed to the lower boom 9 and the upper boom 10 are connected to the pinion 24,
25 will be rotated. However, the pinions 24 and 25 are connected to the sprocket wheel 30, respectively.
Since both pinions 24 and 25 are connected by a chain 38, their rotations are controlled so that they rotate in the same direction and at the same speed.If the diameters of the pinions 24 and 25 are the same, the amount of movement of the racks 26 and 27 will be the same. That is, the extension amounts of the lower boom 9 and the upper boom 10 are the same. From this, the lower boom 9 and the upper boom 10 pulled out from the middle boom 8 extend in synchronization with the same amount of movement. Also, chain 38
When the sprocket wheel 36 is moved, the sprocket wheel 36 provided in the center of the middle boom 10 rotates, which rotates the control ring 35 and rotates the other sprocket wheel 36 provided in the other middle boom 8. The amount of movement of the other chain (not shown) is regulated, and the amount of extension of the lower boom 9 and the upper boom 10, which are extended from the middle boom 8 by the racks 26, 27 and pinions 24, 25, is matched as described above. let For this reason, a pair of lower boom 9 and an upper boom 10 of a pair of telescopic booms are connected in an X shape.
The extension amounts of each of these are completely the same, the distances from the connecting shaft 11 to each of the connecting pieces 12 and 13 are all the same, and each middle stage boom 8 rotates in an X-shape around the connecting shaft 11, and one stage It acts to lift the eye lifting platform 5. When the platform 5 is raised, each of the lower booms 9 and the upper booms 10 extend by the same amount, so that they only rise straight upwards, and do not deviate from side to side.
It can be raised to a predetermined height. Second
3, the lifting mechanism 4 is extended to the maximum, the lifting platform 5 is raised to the maximum height position, and the second lifting platform 6 is placed at a distance from the first lifting platform 5 by the support 52.
It shows the state where it is supported.

Conversely, in order to lower the elevator platform 5, by reducing the hydraulic pressure in the hydraulic cylinder 17, the lower boom 9 and the upper boom 1 are placed in the middle boom 8, contrary to the above.
0 is gradually pushed in, the interval between the connecting pieces 12 and 13 is narrowed, the middle boom 8 is rotated around the connecting shaft 11, and the lifting platform 5 is lowered. At this time, as described above, the chain 38 and sprocket wheel 3
0,36, rack 26,27, pinion 24,2
5 act together, the lower boom 9 and the upper boom 10 are each pushed into the middle boom 8 by the same amount, and the lifting platform 5 is gradually lowered straight down.

Assembling the lifting tables 5 and 6 The lifting tables 5 and 6, which have two levels (upper and lower), are normally placed on the first stage.
As shown in the figure, they are stacked vertically, and when used, the second stage lifting platform 6 must be assembled with a distance from the first stage lifting platform 5. This will be explained with figures.

Figure 9A shows the same stacked state as in Figure 1. In this state, the lifting mechanism 4 is activated to lift the two lifting platforms 5 and 6 in the X direction, as shown in Figure 9B. move it to a predetermined height position.
The lift tables 5 and 6 are held in their lifted positions, and the columns 52 are lifted from below in the Y direction and inserted into the engaging tools 46, respectively.
The connector 47 is inserted so that its top part fits into the space within the connector 47. Thereafter, the pins 51 are inserted into the pin holes 50 to connect each connector 47 and each column 52, and the lower end of each column 52 is brought into contact with the upper surface of the catch 45. When the work of fitting the support column 52 to the connector 47 is completed, the elevating mechanism 4 is operated to lower only the first stage elevating table 5 in the Z direction and return it to the lowest position. The second-stage lifting platform 6 is supported by four columns 52 and held at a position equal to the length of the columns 52 as shown in FIG. become. In this state of Fig. 9 C, pin 4
9 is inserted into the pin hole 48, the support column 52 and the engagement tool 46 are connected by the pin 49, and the lifting platforms 5 and 6 are assembled into a three-dimensional shape with a gap between them with the support column 52 interposed. A handrail 53 is provided around the elevator platform 5.
The assembly is completed by installing the lifting mechanism 4, and by extending the lifting mechanism 4 again, the lifting platforms 5 and 6 move vertically while maintaining the distance between them, as shown in Figure 9D, and the two-story building is It will have the function of lifting tables 5 and 6. Workers, materials, etc. can be placed on each of the elevator platforms 5 and 6 to perform construction work such as assembling a building and painting walls.

In order to disassemble the two lifting platforms 5 and 6 and move them to the next work site, proceed with the disassembly work in the order of D, C, B, and A in Figure 9 in the reverse order of the above. .

〔Effect of the invention〕

Since the present invention is constructed as described above, it is possible to assemble a plurality of elevating platforms at vertical intervals by the elevating mechanism without using any special crane or jig, and the assembly is easy and there is no need to use any special crane or jig. Since no additional mechanism is required, the mechanism is simple. Furthermore, since the elevating platform can be assembled in multiple layers at intervals, the range of side surfaces on which work can be performed is expanded, and panel attachment work and painting work can be performed quickly.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the elevating mechanism with the elevating mechanism in its lowest position, Fig. 2 is a side view showing the elevating mechanism in its fully extended state, and Fig. 3 is a side view showing the elevating mechanism in its lowest position. Rear view of the state in Fig. 2, No. 4
The figure is a side cross-sectional view showing the inside of the middle boom, Figure 5 is a cross-sectional view taken along arrow A-A in Figure 4, Figure 6 is a longitudinal cross-sectional view of the center of the middle boom, and Figure 7 shows the configuration of the synchronization mechanism. FIG. 8 is an enlarged perspective view showing in detail the vicinity of the column, the receiving tool, the engaging tool, and the connecting tool, and FIG. 9 is an explanatory diagram showing the assembly order of the lifting platform. DESCRIPTION OF SYMBOLS 1... Vehicle body, 4... Lifting mechanism, 5, 6... Lifting platform, 45... Receptacle, 46... Engagement tool, 47...
... Connector, 52... Support.

Claims (1)

[Claims] 1. A movable vehicle body, a first elevating platform located above the vehicle body, an elevating mechanism that is interposed between the vehicle body and the first elevating platform and moves the elevating platform up and down, and a second elevator platform that is removably placed above the first elevator platform; a catch that protrudes from the side of the vehicle body and contacts the lower end of the elongated column; and a receiver that protrudes from the side surface of the first elevator platform. The second lifting platform is comprised of an engaging tool that is provided so that the support can be inserted through the support and can be engaged in the middle of the support, and a connecting tool that is provided to protrude from the side surface of the second elevator platform and is detachably connected to the upper end of the support. A lifting device characterized by: