JPH01285598A - Elevatable device - Google Patents

Abstract

PURPOSE:To lighten upper weight and improve stability of an elevatable device by forming the extreme point side of expansion booms thin. CONSTITUTION:When hydraulic cylinders 20a, 20b are expanded from the vehicle body side, sliding bodies 15a, 15b are lifted with the hydraulic cylinders, slidably moved on respective expansion booms, and a pair of expansion booms are stood up respectively. Simultaneously with this motion, respective expansion booms are expanded, and an elevatable base 6 are gradually lifted without fluctuation. Sequentially, by slidably moving of the sliding bodies on the outer circumference of the expansion booms, a pair of expansion booms changes its shape into X-like form, and lifts higher and supports stably the elevatable base. And when the sliding bodies pass through the top ends of lower step booms 12a, 12b and move into middle step booms 13a, 13b, step differences appear between them. But intervenient means drawn from the middle step booms simultaneously with expansion of the expansion booms, are exposed outside of the middle step booms, the sliding bodies are held and smoothly slided along the outer circumference of the respective expansion booms with this intervenient means.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is useful for lifting workers or materials upward for work such as assembling and painting buildings at high places, and for building sites that are no longer required. Regarding the lifting device used for loading and unloading materials, in particular, a pair of telescopic booms are arranged in an X shape, and a sliding body is provided to slide on the outer periphery of both telescopic booms. The present invention relates to a lifting device characterized in that a lifting platform is raised by the lifting force of a moving object.

[Conventional technology]

Lifting devices that raise and lower platforms are used for assembly, painting, and repairs at high places such as highways and building construction.
Workers and materials were placed on this lifting platform and lifted, and unneeded construction materials were loaded and unloaded.

In this conventional elevating device, a pair of arms are pivoted at the center to form one set, and a pantograph-type telescopic mechanism is used in which multiple sets of arms are connected vertically (so-called scissor type). In order to increase the maximum height of the lifting device, it was necessary to increase the length of each set of arms or to increase the number of connected arms. For this reason, if we were to design a lifting device that can increase the height that can be climbed, it would be necessary to use multiple sets of pantographs, and the height of the lifting platform with the pantographs folded would be higher than the ground, making it difficult for workers to lift and lower the platform. The work of getting on and off the platform, loading and unloading materials was cumbersome.

In order to eliminate this drawback, various proposals have been made in the past, and for example, a structure as disclosed in US Pat. No. 3,820,631 has also been proposed.

In this proposed structure, a lower boom and an upper boom that can move linearly are inserted into and removed from the middle boom, the lower end of the lower boom is connected to the vehicle body with a pin, and the upper end of the upper boom is connected to the platform. They are assembled to form an X shape by connecting them with pins. With this structure, the length of the boom itself becomes longer, so the height of the platform can be lowered when it is folded, and the platform can be lifted to a higher position than the number of stages of the boom.

However, in this invention, the mechanism that extends the lower and upper booms from the middle boom is composed of a screw and a female screw that engages with the screw, so the lower and upper booms extend and retract with respect to the middle boom at a slow speed, and the platform can be moved quickly. It was impossible to respond. In addition, since the lower and middle booms are slid by a screw installed in the center of each middle boom, the total length of each of the lower and middle booms is set to only about half the length of the middle boom. The structure was such that the lower boom and upper boom, which extend and retract from the middle boom, could only be operated by half the length of the middle boom, making it impossible to lift the platform higher.

In addition, a structure has been proposed in which another boom is inserted into the boom to lengthen the entire length of the boom itself. The lower and upper booms with smaller diameters are inserted into the middle boom, and by sliding the lower and upper booms inserted inside the middle boom, the overall length of the boom is lengthened, which makes the platform higher. A lifting structure has been proposed.

However, in this structure, there is no mechanism to synchronize the amount of expansion and contraction between the lower boom and the upper boom, which are pulled out from the middle boom, and the lower boom and upper boom slide independently, and the movement of both The amount is regulated by a bar linkage. For this reason, it has been impossible to lift the platform vertically while maintaining a horizontal state, and it has been impossible to lift the platform horizontally to a desired vertical height position. In addition, when the lower boom and upper boom stored inside the middle boom expand and contract, the amount of movement is regulated by a link mechanism formed by a bar, so it is impossible to completely synchronize the amount of movement of both. . Therefore, it is not possible to connect the lower boom to the car body and the upper boom to the platform using pins, etc., and any errors that cannot be absorbed must be made by rollers that are in contact with the car body and platform. For this reason, the platform suffers from the accumulation of looseness due to the large number of pivot points in the link mechanism, as well as the rolling movement caused by the rollers, resulting in a structure that is susceptible to swaying, making it extremely unstable as it easily sways due to wind and other factors. This made the staff feel uneasy.

In order to eliminate these drawbacks, proposals have been made, for example, as disclosed in patent application No. 41289 of 1982.

In these applications, a lower boom and an upper boom are inserted into the middle boom, the ends of the lower boom and the upper boom are connected by flexible connecting means, and the connecting means is pivoted to the middle boom. The structure is such that the direction of movement is changed by means of a changing means. In this configuration,
At the same time as the lower boom is pulled out from the middle boom, the upper boom is pushed out from the middle boom, and the amount of movement of the lower and upper booms is regulated by the connecting means, so the amount of movement of the lower and upper booms is the same, and the amount of movement of the lower and upper booms is the same. A pair of middle booms pivoted at the center can rotate in an X-shape to push the platform vertically upward.

In this configuration, the lower and upper booms are housed inside the middle boom, so when the lower and upper booms are extended beyond the middle boom, they will be about three times as long as the middle boom. The entire length of the platform can be extended, and the platform can be lifted higher than when it is folded.

However, in this newly proposed lifting device, 2
&11's telescopic boom has a large diameter at the center, and the lower and upper booms, which extend up and down, have smaller diameters.When the telescopic boom is extended to its maximum and the platform is lifted, the middle boom, which has a large diameter, He was lifted higher and his center of gravity shifted upwards. For this reason, when the platform is lifted, the center of gravity shifts, resulting in instability.

For this purpose, a telescopic boom with multiple stages is interposed diagonally between the car body and the lifting platform, and at the same time the telescopic boom is extended and contracted, the telescopic boom is raised up. An elevating device has also been proposed that expands the angle of the elevating platform and controls it so that it becomes two-shaped. However, this new elevating device had the drawbacks of poor stability and susceptibility to vibration because it had only one telescoping boom to support the elevating platform.

[Problem that the invention seeks to solve]

In view of the above-mentioned drawbacks, in the present invention, among the telescopic pink telescopic booms, the boom body with the largest diameter is connected to the vehicle body side, and the boom body with the smallest diameter is connected to the lifting platform side. These telescopic boom bodies are arranged alternately on the vehicle body in the same shape, and are configured to form an X-shape when extended or contracted.

A sliding body that slides on each surface is inserted into both telescopic boom bodies arranged alternately, and this sliding body is moved up and down by a hydraulic cylinder interposed between the vehicle bodies.

[Means for solving problems]

In the present invention, a movable vehicle body, a lifting platform located above the vehicle body that can be raised and lowered up and down, and a first telescopic boom connected between one end of the vehicle body and the other end of the elevator platform and capable of telescopically extending and contracting. a second telescopic boom connected between the other end of the vehicle body and one end of the lifting platform and capable of telescopically extending and retracting; and a sliding body that slides on the outer surfaces of the first telescopic boom and the second telescopic boom. and a hydraulic expansion/contraction mechanism interposed between the vehicle body and the sliding body.

[Effect]

In the present invention, when the hydraulic cylinder is extended from the vehicle body side,
The sliding body is lifted by a hydraulic cylinder, and the sliding body slides on the surfaces of both telescopic booms to raise each of the pair of telescopic booms and at the same time act to extend both telescopic booms, thereby gradually lifting the platform. As the sliding body slides along the outer periphery of the telescopic booms, the pair of telescopic booms deforms into an X-shape, raising the height of the platform higher.

When the sliding body passes the tip of the lower boom and moves from the upper end of the lower boom to the middle boom, there is a step between the two, but it is pulled out from the middle boom at the same time as the telescopic boom extends. An intervening means is exposed to the outside of the middle boom, and the sliding body is held by this intervening means. Thereby, the sliding body can pass through the steps and slide smoothly along the outer periphery of each telescopic boom, and the lifting platform can be lifted to a high position.

〔Example〕

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

Fig. 1 is a side view of the lift Ill device in this embodiment, and Fig.
The figure is a side view showing the same lifting platform raised high.
FIG. 3 is a front view of the same as above.

The upper surface of the vehicle body 1, which houses Eladin, a hydraulic pressure generating mechanism, etc., is flat, and wheels 2.3 are pivotally supported at the four corners of the lower surface, and a crawler 4 is wound around between these wheels 2.3. .

A compressor groove 5 is placed on the top surface of the car body 1.
A lift platform 6 for loading workers, materials, etc. is placed on the top of the telescopic mechanism 5. A handrail 7 is vertically fixed around the elevator platform 6.

The telescopic machine 115 is composed of four telescopic booms 1la-d and four sliding tubes 15a-d. Each of these telescopic booms 1la-d is a lower boom 12a-d,
The middle booms 13a to 13a are composed of upper booms 14a to 14d, and the lower booms 12a to 12d are hollow cylinders with a square cross section.
middle booms 13a-d are slidably inserted into the middle booms 13a-d.
Upper booms 14a-d are slidably inserted into middle booms 13a-d. As a result, the lower boom 12a-
d. Middle stage booms 13a to d1 Upper stage booms 14a to d1 are formed in a telescopic shape, and the respective booms are slidably combined.

The lower booms 12a and 12d are pivot pieces tea fixed to one end of the upper surface of the vehicle body l (on the left side in FIG. 2).

16d, and is swingably connected to the lower boom 12b.
and 12c are swingably connected to shaft support pieces 16b and 16C fixed to the upper surface of the vehicle body 1 (on the right side in FIG. 2). The tips of the upper booms 14a and 14d are connected to the lifting platform 6.
A shaft support piece 17a fixed to the other end of the lower surface (right side in Figure 2) of
, 17d, and is rotatably connected to the upper boom 14.
The upper ends of b and 14c are rotatably connected to a shaft support piece 17b117c fixed to one end of the lower surface of the lifting platform 6 (on the left side in FIG. 2).

Further, the sliding tubes 15a to 15d have a cylindrical shape with a rectangular cross section, and the inner diameter thereof is equal to the lower boom 12a w d.
The sliding tube 15 is formed into a shape that is almost the same as the outer diameter of
A is inserted into the telescopic boom lla so that it can be slid in the length direction, a sliding tube 15b is inserted into the telescopic boom llb so that it can be slid in the length direction, and a sliding tube 15c is inserted into the telescopic boom lla so that it can be slid in the length direction. It is inserted so that it can slide in the length direction of the IIC, and the sliding tube 15d is inserted so that it can slide in the length direction of the telescopic boom lid. The sliding tubes 15M and 15b are rotatably connected by a connecting shaft 18a at the center of their opposing sides, and the sliding tubes 15c and 15d are rotatably connected by a connecting shaft 18b at the center of their opposing sides. It is. Further, the centers of opposing surfaces of the sliding tubes 15b and 15G are connected by an operating shaft 19, and the operating shaft 19 allows the sliding tubes 15b and 15c to rotate freely relative to each other.

A pair of hydraulic cylinders 20a, 20 are provided between two spaced apart locations on the upper surface of the vehicle body 1 and the operating shaft 19.
b is interposed, and these hydraulic cylinders 20a, 20b
are arranged so that they form a V-shape when viewed from the side.

Next, FIGS. 4 and 5 are enlarged views of the structure near the aforementioned sliding tubes 15a-d, with FIG. 4 being a perspective view and FIG. 5 being a front view.

As mentioned above, the sliding tubes 15a and 15b are rotatably connected at the center by the connecting shaft 18a, and the sliding tube 15c
and 15d are rotatably connected at the center by a connecting shaft 18b. The sliding tubes 15b and 15C are connected at the center by an operating shaft 19, and the four sliding tubes 15a to 15d each have a connecting shaft 19 whose axes coincide with each other.
8a, 18b, and are integrally connected by an operating shaft 19.

A coupling fitting 21 is fixed to the center of the operating shaft 19, and this coupling fitting 21 has a slightly triangular shape, and the hydraulic cylinders 2Qa, 20b are attached to both sides of the lower part of the coupling fitting 21.
The tips are rotatably connected by bins 22a and 22b.

Next, FIG. 6 shows the cross-sectional structure of the two telescopic booms 11, and the other telescopic booms 1la to 1d all have the same structure.

The lower boom 12 has a rectangular cross section formed by bending a thin steel plate, and the middle boom 13 slides in the internal space of the lower boom 12 in its length direction! 'J+ can be inserted freely. This middle boom 13 is formed by bending a thin steel plate into a rectangular cross section, and the outer diameter of the middle boom 13 is set by bending a thin steel plate into a square cross section.
It is formed into a shape slightly smaller than the inner diameter of No. 2. Furthermore, an upper boom 14 is slidably inserted into the inner space of the middle boom 13, and the outer diameter of the upper boom 14 is the same as that of the middle boom 1.
It is formed in a shape slightly smaller than the inner diameter of No. 3.

A pulley 31 is pivotally supported at the lower end of the middle boom 13, and a wire 32 is brought into contact with the pulley 31 so as to be reversed, and one end of the wire 32 is connected to the upper end of the lower boom 12. The other end of the wire 32 is connected to the lower end of the upper boom 14.

Next, a wire hook 33 is fixed to the upper end of the lower boom 12, and a pulley 34 is pivotally supported at the lower end of the middle boom 13. The wire 35 is wound around the inner and outer peripheries of the wire 35, and both ends of the wire 35 are connected to wire hooks 33, respectively.

A plurality of rollers 36 are attached to the wire 35 at intervals, and the diameter of the rollers 36 is approximately the thickness of the lower boom 12.

Next, FIG. 7 shows an enlarged view of the vicinity of the open end of the lower boom 12, and explains in detail the mounting structure of the roller 36.

The wires 35 are provided in two rows at intervals,
The tips of both wires 35 are connected to the wire hook 33. A plurality of rollers 36 are arranged at intervals between the wires 35, the diameter of the rollers 36 is approximately equal to the thickness of the lower boom 12, and the rollers 36 are in contact with the outer surface of the middle boom 13. In some cases, the diameter is such that it can come into contact with the inner surface of the sliding tube 15.

Further, a roller groove 37 is formed in the center of the side surface of the upper boom 14 and is recessed inwardly over the length direction of the upper boom 14.
The rollers 36 are sequentially accommodated in the roller groove 37. Therefore, when the middle boom 13 is pulled out from the lower boom 12, the wire 35 is pulled out, and as the wire 35 is pulled out, the wire 35 is pulled out.
The roller 36 connected to the roller 5 is pulled out from the roller groove 37 and moved from the position housed in the roller groove 37 to the outside of the middle boom 13.

Next, the operation of this embodiment will be explained.

First, the state shown in FIG. 1 shows the state in which the elevating table 6 is lowered to the lowest position, and FIG. 2 shows the state in which the elevating table 6 is raised to the maximum position.

Then, in the state shown in FIG. 1, a worker gets on the lifting platform 6 and moves the control mechanism to generate a hydraulic pressure generating device (not shown), which supplies hydraulic pressure to the hydraulic cylinders 20a and 20b. This supplied hydraulic pressure is applied to both hydraulic cylinders 20a, 2.
The same supply amount is supplied to both hydraulic cylinders 2Qa and 20b, and control is performed so that both hydraulic cylinders 2Qa and 20b extend at the same speed.

Then, when the hydraulic cylinders 20a, 20b expand, the amount of expansion is transmitted to the operating shaft 19 via the coupling fitting 21, and is transmitted to the four sliding cylinders 15a to 15d,
It operates to lift the axd. For this reason, each of the telescopic booms 1la-d is lifted to stand up against the vehicle body 1 with the pivot pieces 16a-d as the center of rotation, and rotates around the operating shaft 19 to form an X-shape. I am made to do so. At the same time as the telescopic booms lla to d are raised, the middle booms 13a to d and the upper booms 14a to 14d
are lower boom 12aNds middle boom 13a~
It is drawn out from d.

That is, the distance between the shaft support pieces 16a and 16b and the distance between the shaft support pieces 17a and 17b are fixed and cannot be extended, and when the telescopic booms 1la-d stand up, the distance between the shaft support pieces 16a and 17a is fixed. , since the space between the shaft support pieces 16b and 17b is extended, the middle booms 13a-d,
The upper pools 14a-d are pulled out. Since the wire 32 is in contact with the pulley 31 when the middle booms 13a to 13d and the upper booms 14a to 14d are pulled out, the middle booms 13a to d1 and the upper boom 1
The withdrawal speeds of 4a-d will be the same and the same length will always be withdrawn.

Then, the middle booms 13a-d are connected to the lower booms 12a-d.
When the wire 35 is pulled out, the wire 35 is wound around the outer circumference of the middle boom 13.
5 rotates the pulley 34 while rotating the middle boom 13a-
It will slide on the inner and outer peripheries of d. Then wire 3
The rollers 36 connected to the middle booms 13a to 13d are pulled out from the roller grooves 37 and are sequentially exposed to the outside of the middle booms 13a to 13d.

When the hydraulic cylinders 20a and 20b further extend, the lifting platform 6
is high (as it is lifted, the middle boom 13a w
d is further pulled out from the lower boom 12a-d, and each sliding tube 15a-d is separated from the tip of the lower boom 12axd,
It is located outside of the middle booms 13a-d. At this time, there is a step between the lower booms 12a-d and the middle booms 13a-d due to the thickness of the lower booms 12a-d, but the inner surface of each sliding tube 15a-d is in contact with the outer periphery of the roller 36. , this roller 36 will be moved further while being transferred.

That is, when the sliding tubes 15a to 15d are in contact with the outside of the lower booms 12a to 12d, they move smoothly like pistons, but at the difference in level between the lower booms 12a to 12d and the middle booms 13a to d. Since the roller 36 absorbs the thickness of the step, the middle boom 13 continues to be
It is possible to move smoothly around the outer periphery of a to d. Then, the hydraulic cylinders 20a120b are extended to the maximum, the middle booms 13a-d are pulled out from the lower booms 12a-d to the maximum extent, and the upper booms 14a-d are pulled out from the middle booms 12a-d to the maximum extent.
3a-d indicates the maximum extension position of the lifting platform 6.

Note that the above sequence was explained for the case of lifting the platform, but in order to lower the platform from the position shown in Figure 2 and store it in the lowest position as shown in Figure 1, the above procedure is different. You can do the opposite.

That is, the pressure oil supplied to both hydraulic cylinders 20a, 20b is sequentially discharged at the same speed, and both hydraulic cylinders 20a, 20
The actuating shaft 19 is pulled downward while always keeping the reduced length of b constant. Then, the four sliding tubes 15a-d connected to the operating shaft 19 are lowered, and accordingly, each of the telescoping booms 1la-d is brought down to approach the vehicle body 1, and at the same time, the middle booms 13a-13a-d are lowered. d slides to be stored in each of the lower booms 12a to 12d,
The upper booms 14a-d are the middle booms 13a-d, respectively.
Slide so that it is stored in the

At this time, the sliding tubes 15a to 15d that were moving in contact with the rollers 36 are sequentially lowered, and the middle boom 13
It further descends from the outer position of a-d, eliminates the level difference between the lower booms 12a-d and the middle booms 13a-d by the roller 36, and slides each sliding cylinder 15a-d successively on the lower booms 12a-d, respectively. Move it as you like. The contact by this roller 36 is completed, and each sliding tube 15a-
d slides on the outer periphery of the lower booms 12a-d, and when each sliding tube 15a-d moves to approximately the center of the lower booms 12a-d, the telescopic booms 1la-d become more parallel than the X-shape. The elevator platform 6 can be folded up to lower the elevator platform 6 to the lowest position.

In this embodiment, the telescopic booms tta to d have been explained with reference to three-stage telescopic booms, but the same effect can be obtained not only in this embodiment but also in four-stage or three-stage telescopic booms. Needless to say, it can be done.

〔effect〕

Since the present invention is configured as described above, it is possible to make the tip side of the telescopic boom a thin boom to reduce the weight of the upper part, thereby improving stability. Since the platform is supported in a letter-shaped manner, the platform does not shake much and can be held stably.

[Brief explanation of the drawing]

Fig. 1 is a side view of the elevating platform of an elevating device showing an embodiment of the present invention in a folded state, Fig. 2 is a side view showing the same elevating platform raised to its maximum position, and Fig. 3 is a front view of the same as above, Fig. 4 is an enlarged perspective view showing the vicinity of the sliding tube and operating shaft in detail, Fig. 5 is a front view of the same as above, and Fig. 6 is a side cross section showing the internal structure of one telescopic boom. 7 are enlarged perspective views showing the open end of the telescopic boom. 1... Vehicle body, 5... Extension structure, 6... Lifting platform, l
la-d...Telescopic boom, 12a-d...Lower boom, 13a-d...Middle boom, 14a-d...Upper boom, 15a-d...Sliding tube, 18a-b.・・・
Connection shaft, 19... Operating shaft, 20a, 20b... Hydraulic cylinder, 35... Wire, 36... Mouth agent
Patent Attorney Tsuneaki Hibi Figure 1 Figure 2 A Figure 4 1Rr+ Figure 5

Claims (1)

[Claims] A movable vehicle body, a lifting platform located above the vehicle body that can be raised and lowered up and down, a first telescopic boom connected between one end of the vehicle body and the other end of the elevator platform and capable of telescopically extending and contracting, a second telescopic boom connected between the other end and one end of the lifting platform and capable of telescopically extending and contracting; a sliding body that slides on the outer surfaces of the first telescopic boom and the second telescopic boom; A lifting device consisting of a hydraulic expansion and contraction mechanism interposed between sliding bodies.