JPH04327496A - Multi-stage retractable boom device - Google Patents

Abstract

PURPOSE:To reduce the cross-sectional area of a boom of a multi-stage retractable boom device such as that for a high place working vehicle, which can pay out a cable or the like from the proximal end of the boom to the forward end of the boom through the inside of the boom. CONSTITUTION:A boom extending cylinder device 6 is connected between a first boom and a second boom as forward end booms 2. There are provided a coupling member 16 which is coupled to the inner side wall of the rear end part of a third boom 3 at a position below the boom extending cylinder device, and which is extended in the first to third booms 1, 2, 3, substantially parallel with the axis of the boom extending cylinder device, and a second boom extending pulley 15 attached to the rear end of the second boom at a position in rear of the rear end of the boom extending cylinder device, substantially coaxial with the latter, and having a diameter greater than that of the same. With this arrangement, a cable or the like can be vertically laid along the coupling member, the second boom extending pulley 15 and the boom extending cylinder device.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention provides a multi-stage telescopic boom device,
In particular, the present invention relates to a multistage telescopic boom device for an aerial work vehicle.

0002

[Prior Art] Generally, in a multi-stage telescopic boom device for an aerial work vehicle, hydraulic hoses, electrical wiring, etc. (herein collectively referred to as cables, etc.) are connected to an aerial work box located at the tip of the multi-stage telescopic boom. It is necessary to guide from the proximal side.

Conventionally, as a means for guiding cables and the like from the proximal boom of a multi-stage telescopic boom to the work box at the tip of the distal boom, for example, as disclosed in Japanese Patent Application Laid-Open No. 62-205840, cables and the like are connected to a telescopic boom. A method of disposing the cable on the outer surface of the telescopic boom and a method of passing the cable etc. inside the telescopic boom as disclosed in Japanese Utility Model Publication No. 62-25513 are known.

[0004] In the former method, cables and the like often suffer external damage, and as a result, there are practical problems in that high-place work in a work box is interrupted and unforeseen disasters are likely to occur.

[0005] On the other hand, the latter Jikoko Sho 62-2551
With the structure described in Publication No. 3, in which the cables, etc. are placed inside the boom, there is no problem that the cables, etc. will be damaged externally, but the boom extension/retraction cylinder device is necessary to create a space just for passing the cables, etc. inside the boom. Since the structure is such that guides and means such as pulleys for passing cables etc. are installed in the upper space, if the telescopic boom device is made to have more than three stages, the boom cross section will inevitably become large. As a result, the weight of the telescopic boom device increases, so it is necessary to increase the size of the vehicle of the undercarriage to achieve a stable balance, which poses an economical problem.

[0006]

[Problems to be Solved by the Invention] The present invention provides a multi-stage telescopic boom device for an aerial work vehicle in which cables, etc. are passed through the telescopic boom, and the boom cross-section is increased even when the multi-stage structure is four or more stages. It is an object of the present invention to provide a multi-stage telescopic boom device that does not require the following steps.

[0007]

[Means for Solving the Problems] The present invention provides a first boom that constitutes a tip boom, a second boom that telescopically inserts the first boom, and a second boom that telescopically inserts the second boom. a third boom; a cylinder device for telescoping the boom connected between the inner wall of the first boom and the inner wall of the rear end of the second boom and interposed between the first and second booms; The rear end of the cylinder device is connected to the inner wall of the rear end of the third boom at a lower position and extends into the first, second and third booms substantially parallel to the axis of the boom telescoping cylinder device. the connecting member, and the outside of the boom telescoping cylinder device which is attached to the rear end of the second boom substantially on the same axis as the boom telescoping cylinder device and at a position rearward from the rear end of the boom telescoping cylinder device. a second boom extension pulley having an outer diameter larger than the diameter of the second boom extension pulley; a second boom extension cable whose other end is fixed to the front end of the connecting member after being extended along the other side of the boom extension/retraction cylinder device; and a second boom extension cable attached to the front end of the second boom. a boom retraction pulley, one end of which is fixed to the rear end of the first boom;
A second boom reduction cable extends between the first boom and the second boom along these booms, passes around a second boom reduction pulley, and has the other end fixed to a third boom. It is characterized by its basic configuration of a three-stage telescopic boom structure.

According to the present invention, cables such as hydraulic hoses and electrical wiring of hydraulic equipment in the boom telescoping cylinder device and the high-altitude work box are routed from the front end of the first boom to one side of the boom telescoping cylinder device. , and extends along the other side of the boom extension cylinder device through a cable pulley provided coaxially with the second boom extension pulley, and extends from the cable guide at the front end of the connecting member to the second boom extension cylinder device. 3 It is best to extend it toward the rear end of the boom.

Further, according to the present invention, the third boom is provided with a fourth boom that is telescopically inserted therein, a third boom extension pulley is attached to the rear end of the third boom, and a third boom extension pulley is attached to the front end of the third boom. A third boom retraction pulley is installed, and one end of the third boom extension cable is fixed to the rear end of the second boom, passing around the third boom extension pulley and extending between the third and fourth booms. The other end of the cable is fixed to the front end of the fourth boom, and one end of the third boom reduction cable is fixed to the rear end of the second boom, passing around the third boom reduction pulley to the third boom reduction cable. It is preferable to configure a four-stage telescopic boom structure by fixing the other end to the front end of a four-boom.

[0010] Furthermore, a fifth boom is provided in which the fourth boom is telescopically inserted, a pulley for extending the fourth boom is attached to the rear end of the fourth boom, and a pulley for retracting the fourth boom is attached to the front end of the third boom. Attach the boom pulley and connect the fourth boom extension line to the third
It is fixed to the rear end of the boom, passes around the fourth boom extension pulley, extends between the fourth and fifth booms, the other end is fixed to the front end of the fifth boom, and the fourth boom is retracted. One end of the cable is fixed to the rear end of the second boom, the cable is extended between the third and fourth booms, passes around the fourth boom retraction pulley, and the other end is fixed to the front end of the fifth boom. Preferably, the booms are assembled together to form a five-stage telescoping boom structure.

[0011]

[Operation] According to the present invention, the boom extension/retraction cylinder device is connected between the first boom, which is the tip boom, and the rear end of the second boom, and the first boom is extended/retracted by the boom extension/retraction cylinder device. The second boom extension pulley is attached to the rear end of the second boom at a position rearward from the rear end of the boom extension/retraction cylinder device, and the outer diameter of the second boom extension pulley is set to the rear end of the boom extension/retraction cylinder device. By providing a connecting member that is larger than the outside diameter of the cylinder and whose rear end is connected to the rear end of the third boom and extends parallel to the lower side of the boom extension/retraction cylinder device, the second boom can be extended. The cable is passed through the upper and lower sides of the cylinder device for boom extension and retraction, and the cable etc. is passed through the upper and lower sides of the cylinder device for boom extension and retraction in parallel with the second boom extension cable. The space required for installation can be shared with the space for installing the boom telescoping cylinder device, and therefore the cross-sectional area of the boom can be reduced.

Further, according to the present invention, a five-stage telescopic boom device can be obtained by connecting two sets of three-stage telescopic boom structures having the basic configuration according to claim 1 in series, and furthermore, a five-stage telescopic boom device can be obtained by connecting three sets of three-stage telescopic boom structures in series. By doing so, a 9-stage telescopic boom device can be obtained by connecting four sets of 7-stage telescopic boom devices in series. In this way, with n three-stage telescopic boom structures (
A 2n+1) stage telescopic boom device can be configured.

Furthermore, a three-stage telescopic boom on the proximal end side of a multi-stage telescopic boom device having a five-stage telescopic boom structure obtained by connecting two sets of three-stage telescopic boom structures having the basic configuration according to claim 1 in series. Claim 7 or 8 for the structure
A six-stage telescopic boom device can be obtained by using the four-stage telescopic boom structure described in .

Furthermore, a three-stage telescopic boom on the base end side of the multi-stage telescopic boom device having a five-stage telescopic boom structure obtained by connecting two sets of three-stage telescopic boom structures having the basic configuration according to claim 1 in series. A seven-stage telescopic boom device can be obtained by using the five-stage telescopic boom structure as described in claim 9.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show an embodiment of a three-stage telescopic boom device which is the basic structure of a multi-stage telescopic boom device according to the present invention. As shown in the drawings, the basic structure of the present invention is 3.
In the stage telescopic boom device, a second boom 2 and a third boom 3 as a proximal boom are sequentially and slidably inserted into a first boom 1 as a tip boom, and the first boom 1 and the second boom 2 are connected to each other.
A cylinder device 6 for expanding and retracting the boom is provided between the boom and the boom. This boom telescoping cylinder device 6 has a base end of its cylinder 7 connected to the inner wall of the rear end of the second boom 2 by a base end pin 8, and a tip end of the piston rod 9 connected to the inner wall of the first boom 1. The first boom 1, which is the tip boom, can be extended and contracted with respect to the second boom 2 by connecting it to an appropriate location with a tip pin 10 and thereby operating the cylinder device 6 for expanding and contracting the boom.

Since the second boom 2 is simultaneously extended from the third boom 3 by the extension operation of the boom extension/retraction cylinder device 6 described above, the second boom extension cable 12 is attached to the first boom 1 at one end 12A thereof. It is fixed to the inside of the tip of the rope by a rope stopper 13, and extends from the rope stopper 13 upwardly along the boom telescoping cylinder device 6, and is substantially on the same axis as the boom telescoping cylinder device 6. , and a second boom extension pulley 15 on a pulley shaft 14 attached to the inner wall of the rear end of the second boom 2 at a position rearward from the rear end of the boom extension/retraction cylinder device 6, that is, the rear end of the cylinder 7. It is wrapped around and folded back, and extended along the boom extension/retraction cylinder device 6 to its lower position, and extended from the rear end of the third boom 3, which is the base end boom, along the boom extension/retraction cylinder device 6 to its lower position. The cable rear end 12B is attached to the cable stopper 17 provided at the front end of the connecting member 16 extending to
is fixed.

As described above, the second boom extension pulley 15 is located substantially on the same axis as the boom extension/retraction cylinder device 6 and at a position rearward of the boom extension/retraction cylinder device 6 at the rear end of the second boom 2 . It has an outer diameter larger than the outer diameter of the cylinder 7 of the boom extension/retraction cylinder device 6 in order to pass the boom extension cable 12 back from the upper position to the lower position of the boom extension/retraction cylinder device 6 as described above.

As described above, the connecting member 16 is for transmitting the extension operation of the boom extension/retraction cylinder device 6 to the third boom 3 via the boom extension cable 12. Therefore, as shown in the figure, the rear end 16A of the connecting member 16 is connected and supported by the support pin 18 to the inner wall of the rear end of the third boom 3, which is the proximal boom, and the distal end 16B has a supporting sliding member. 19 is fixed, and this is slidably supported by the cylinder 7 of the boom telescoping cylinder device 6 (Fig. 1
5), the support sliding member 19 is provided with a cable stopper 17.

As described above, the connecting member 16 is provided extending from the support pin 18 in parallel to the cylinder 7 of the boom telescoping cylinder device 6 at a position below the cylinder 7.
The support pin 18 is positioned approximately in the transverse axis direction of the stopper 17 of the second boom extension cable 12, so that the support sliding member 1
9 is configured to suppress the generation of a component force in the vertical direction by the second boom extension cable 12, thereby reducing the sliding resistance of the support sliding member 19.

The lower part of the connecting member 16 is attached to the bottom of the ship so that the cable 20 can be laid there, and the cable 20 can be folded back from the cable guide 21 provided at the tip of the connecting member 16 and laid inside the connecting member 16 again. It has the shape (
(See Figure 14). The cable 20 is passed around a pulley 15 provided at the rear end of the second boom 2, passes through guide rollers 22 and 23 provided at the tip of the first boom 1, and is then connected to a cylinder device 6 for boom extension and contraction, and for balancing the work box. It is connected to the cylinder device 24 and other hydraulic equipment in the work box.

Reference numeral 25 denotes a second boom retracting rope, the front end of which is fixed to a rope stopper 26 provided at the rear end of the first boom 1, and from this rope stopper 26, the front end of the second boom 2 is attached. A second boom retraction pulley 28 on a pulley shaft 27 provided at the
The cable is fixed to the front end of the third boom 3 by a cable stopper 29 through the circumference of the cable.

[0022] The three-stage telescopic boom device configured as described above is
When the boom is extended, the piston rod 9 of the boom telescoping cylinder device 6 is extended by hydraulic pressure, so that the first boom 1, which is the tip boom, is extended further than the second boom 2. Due to this extension, the second boom extension cable 12 is pulled,
This tensile force is transmitted to the third boom 3 via the connecting member 16, and the second boom 2 is linked and extended from the third boom 3.

In other words, the above-mentioned extension operation is performed by the extension of the piston rod 9 of the boom extension/retraction cylinder device 6.
The first boom 1 extends from the second boom 2, and the second boom 2 extends from the third boom 3. These extension operations are the second
The linked operation of the boom extension cable 12 results in simultaneous boom extension operation. The extension stroke of each boom, that is, the extension stroke of the third boom 3 and the second boom 2, and the second boom 2
and the extension stroke of the first boom 1 have the same length.

Further, when the boom is retracted, the piston rod 9 of the boom telescoping cylinder 6 is retracted by hydraulic pressure, so that the tip boom 1 is retracted inside the second boom 2. As a result of this contraction, the second boom retraction cable 25 is pulled, and the second boom 2 is retracted into the third boom 3.

In other words, the above-mentioned retraction operation retracts the second boom 2 to the outside of the first boom 1 by retracting the piston rod 9 of the boom telescoping cylinder device 6. The third boom 3 will be retracted. Note that the reduction stroke has the same dimension and length for each boom.

FIG. 3 shows a modification of the three-stage telescopic boom device shown in FIG. In this example, the distal end 1 of the connecting member 16 is
Attach the upper and lower guide support rollers 30 and 31 to 6B,
It is configured to be able to roll along the upper and lower inner walls 1A, 1B of the first boom 1, thereby supporting the leading end 16B of the connecting member 16.

FIGS. 4 and 5 show an example in which the present invention is implemented in a four-stage telescopic boom device. The structures of the first boom 1, second boom 2, and third boom 3, which are the tip booms of the illustrated four-stage telescopic boom device, and the telescoping means of these booms are shown in FIG.
As is clear with reference to FIG.
They are indicated by the same reference numerals as , and detailed explanation thereof will be omitted.

In the illustrated example, the fourth
A third boom 3 is slidably inserted inside the boom 4.

In order to extend the third boom 3 in conjunction with the extension operation of the second boom 2, a third boom extension cable 32 is provided, and its tip 32A is connected to the rear end of the second boom 2 by a cable stopper 33. The rear end 32B passes around the third boom extension pulley 35 rotatably attached to the rear end of the third boom 3 by a pulley shaft 34, and then the rear end 32B connects to the rope stopper 36. It is fixed to the front end of the fourth boom 4 by.

Further, a third boom retraction cable 37 is provided for retracting the third boom 3 in conjunction with the retraction operation of the second boom 2.
The cable tip 37A is fixed to the rear end of the second boom 2 by a rope stopper 38, and the cable rear end 37B is rotatably attached to the front end of the third boom 3 from the rope stopper 38 by a pulley shaft 39. It passes around the third boom retracting pulley 40 and is fixed to the front end of the fourth boom 4 by a cable stopper 41.

[0031] The four-stage telescopic boom device configured as described above is
During the extension operation, the first boom 1, which is the tip boom, is extended forward from the second boom 2 by the extension operation of the boom extension cylinder device 6, as shown in FIG. As a result, the second boom 2 is extended forward from the third boom 3 by the second boom extension cable 12 and the connecting member 16, and the third boom 3 is further extended from the proximal end by the third boom extension cable 32. 4th boom
It is pulled out from the boom 4 and extended.

Furthermore, when the four-stage telescoping boom device is retracted, the boom telescoping cylinder device 6 is retracted, so that
At the same time, the first boom 1, which is the tip boom, is retracted from the extended state shown in FIG. 5 to the contracted state shown in FIG. It is retracted into the fourth boom 4, which is the proximal boom, by the three-boom retraction cables 25 and 37.

FIG. 6 shows the fourth boom, which is the proximal boom in FIG.
An example is shown in which the telescoping means of the third boom 3 slidably inserted into the boom 4 is configured by a telescoping cylinder device 45. In this example, a third boom extension/retraction cylinder device 45 is provided in place of the connecting member 16 in the example shown in FIG.
The piston rod 48 extends rearward from the cylinder 46 and is connected to the rear end of the fourth boom 4, which is the proximal boom, by a rear end pin 49. The front end of the cylinder 46 is supported by the boom telescoping cylinder device 6 by a supporting sliding member 19 similar to the one described above, which has its lower end fixed thereto. The rear end of the extension cable 12 is fixed. In this example, cable 20 is connected to cylinder 46
A supporting metal fitting 50 is installed on the side surface of the pipe.

By configuring as shown in FIG.
Compared to the embodiment shown in FIG. 4, the third boom extension cable 32,
The extension pulley 35, the reduction cable 37, the reduction pulley 40, the rope stopper, etc. can be omitted.

FIGS. 7 and 8 show an example in which the multi-stage telescopic boom device according to the present invention is implemented as a five-stage telescopic boom device. The structures of the first boom 1, the second boom 2, the third boom 3, and the fourth boom 4, which are the tip booms of the illustrated five-stage telescopic boom device, and the telescoping means of these booms are as is clear with reference to FIG. This is basically the same as the four-stage telescopic boom device, and therefore, the same components as in FIG. 4 are designated by the same reference numerals as in FIG. 4, and detailed explanation thereof will be omitted.

In the illustrated example, the fifth
The fourth boom 4 is slidably inserted inside the boom 5, and the front end of the fourth boom extension cable 51 is connected to the rear end of the third boom 3 as a means for extending the fourth boom 4 with respect to the fifth boom 5. A fourth boom extension pulley 54 is fixed by a cable stopper 52 and attached to a pulley shaft 53 provided at the rear end of the fourth boom 4.
When the third boom 3 extends from the fourth boom 4 by passing the fourth boom extension cable 51 around it and fixing the rear end of this cable to the cable stopper 55 at the front end of the fifth boom 5, The fifth boom 5, which is the base end boom, is operated in conjunction with the fourth boom 4.
It is configured to extend from .

Furthermore, as a means for retracting the fourth boom 4 with respect to the fifth boom 5, a fourth boom 4 is provided at the rear end of the third boom 3.
The front end of the boom reduction rope 56 is fixed with a rope stopper 57, and the fourth
It passes around the boom retraction pulley 59 and is fixed to the front end of the fifth boom 5, which is the proximal end boom, by a rope stopper 60. As a result, when the third boom 3 is retracted into the fourth boom 4, the fourth boom 4 is linked to this retraction operation and retracted into the fifth boom 5, which is the proximal boom. There is.

The operation of the five-stage telescopic boom device shown in FIG. 7 having the above-mentioned configuration will be explained. When the boom is extended, the piston rod 9 of the boom telescoping cylinder device 6 is extended by hydraulic pressure, so that the first boom 1, which is the tip boom, moves to the second boom.
Extends from boom 2. The second boom extension cable 12 is pulled by this extension, and this tension is transmitted to the third boom 3 via the connecting member 16, and the second boom 2 is linked and extended from the third boom 3. Due to this extension, the third boom extension cable 32 is pulled, and the fourth boom 4 to the third boom 3 are linked and extended. Furthermore, due to this extension, the fourth boom extension cable 51 is pulled, and the fourth boom
Boom 4 is linked and extended.

As described above, when the boom is extended, the first boom 1 is extended by the extension operation of the boom extension/retraction cylinder device 6.
Extension of the second boom 2 from the second boom 2, Extension of the third boom 3 from the second boom 2, Extension of the fourth boom 4 from the third boom 3, Extension of the fifth boom 5 which is the proximal boom from the fourth boom 4. This is an extension of . The extension operation of these booms is performed by each extension line 12.
, 32 and 51, the extension stroke of each boom, i.e., the fifth boom 5 and the fourth
The extension stroke of the boom 4, the extension stroke of the fourth boom 4 and the third boom 3, the extension stroke of the third boom 3 and the second boom 2, and the extension stroke of the second boom 2 and the first boom 1 have the same length.

Next, when the boom is retracted, the piston rod 9 of the boom telescoping cylinder device 6 is retracted by hydraulic pressure, so that the first boom 1, which is the tip boom, retracts inside the second boom 2. As a result of this retraction operation, the second boom retraction cable 25 is pulled, and the second boom 2 is retracted into the third boom 3. Also, due to this reduction, the third boom reduction cable 37
is pulled, and the third boom 3 is retracted into the fourth boom 4. Further, due to this contraction, the fourth boom retraction cable 56 is pulled, and the fourth boom 4 is retracted into the fifth boom 5, which is the proximal boom.

As described above, when the boom is retracted, the piston rod 9 of the boom telescoping cylinder device 6 retracts, causing the second boom 2 to retract outside the first boom 1, and the third boom to the outside of the second boom. 3 is retracted, the fourth boom 4 is retracted outside the third boom 3, and the fifth boom 5 is outside the fourth boom 4.
are retracted, and these retraction strokes have the same dimensions for each boom.

FIG. 9 shows a modification of the five-stage telescopic boom device shown in FIG. 4 boom 2,
They are supported on pulley shafts 27, 39, and 58, respectively, which are installed on the inner wall of the boom so as to be located inside the tips of No. 3 and No. 4, so that when the boom is extended, the No. 2, No. 3, and No. 4
The boom reduction cables 25, 37, and 56 are located inside the boom.

FIG. 10 shows the third embodiment in the embodiment shown in FIG.
FIG. 6 shows a modification in which the telescoping means of the boom 3 is configured by a telescoping cylinder device 45 in the same way as shown in FIG.

FIGS. 11 and 12 show an embodiment in which two sets of three-stage telescopic boom devices shown in FIG. 1, which are the basic configuration of the multi-stage telescopic boom device of the present invention, are connected in series to form a five-stage telescopic boom device. .

In FIG. 11, the boom extending/contracting means of the three-stage boom extending/contracting device on the distal end side provided between the first, second and third booms 1, 2 and 3, ie, the boom extending/contracting cylinder device 6, the boom extension cable. 12, the code of the boom reduction cable 25 and the connecting member 16 and their related parts is 100.
In addition, the boom extension/retraction means of the three-stage boom extension/retraction device on the base end side provided between the third, fourth, and fifth booms 3, 4, and 5 is shown. In order to interlock these two three-stage boom telescoping devices, a connecting flange 120 provided on the connecting member 16 of the three-stage boom telescoping device on the distal end is connected to the proximal end 3
Boom telescoping cylinder device 106 of stage boom telescoping device
The tips of the piston rods 109 are connected by a tip pin 110.

As in the embodiment shown in FIG. 11, a (2n+1) stage telescopic boom device can be constructed by connecting a plurality of basic three-stage telescopic boom devices, ie, n sets, in series. Therefore, three basic three-stage telescopic boom devices can be connected in series to form a seven-stage telescopic boom device, and four basic three-stage telescopic boom devices can be connected in series to form a nine-stage telescopic boom device.

Furthermore, in the five-stage telescopic boom device shown in FIG. 11, the three-stage telescopic boom device shown in FIG.
Alternatively, a 6-stage telescopic boom device can be obtained by combining the 4-stage telescopic boom device shown in FIG. 6, and similarly, the 3-stage telescopic boom device shown in FIG. By combining five-stage telescopic boom devices, a seven-stage telescopic boom device can be obtained.

As mentioned above, the multi-stage telescopic boom device according to the present invention is basically composed of the three-stage telescopic boom device shown in FIG.
By appropriately combining the four-stage telescopic boom device shown in FIG. 4 or FIG. 6 and the five-stage telescopic boom device shown in FIG. 7 or FIG. 10, a multi-stage telescopic boom device with a desired number of stages can be obtained.

FIG. 13 shows an example of a cylinder device 6 for extending and retracting the boom. In the illustrated example, a slidable piston rod 9 is formed as a hollow rod in the cylinder 7, and the center of the piston 61 communicating with the oil chamber 62 on the extension side is formed as a hollow rod. The piston rod 9 is provided with an oil passage 63 and an outer annular oil passage 65 which is provided concentrically on the outside thereof and communicates with the contraction side oil chamber 64 of the piston 61 .

FIG. 14 is a cross-sectional view taken along the line AA in FIG. 7 as seen in the direction of the arrow, and FIG. 15 is a cross-sectional view taken along the line B-B in FIG. 7 as seen in the direction of the arrow. As shown,
The connecting member 16 has a trough-like shape so as to guide and support the plurality of cables 20. In order to guide these cables 20, a cable pulley 67 is rotatably supported on the pulley shaft 14 of the second boom extension pulley 15.

FIG. 16 shows an example in which the multi-stage telescopic boom device according to the present invention is applied to an aerial work vehicle 70. In FIG. 16, 71 is a luffing cylinder device, and 72 is a balance cylinder device, which is forcibly moved by the hoisting operation of the multi-stage telescopic boom device by the hoisting cylinder device. In this balancing cylinder device 72, the work box balancing cylinder device 24 and each oil chamber are communicated with each other. Therefore, the work box balancing cylinder device 24 follows the movement of the balancing cylinder device 72, thereby balancing the work box 73. Collection is taking place. In addition, in the figure, 74 indicates a winch motor, and 75 indicates a manipulator.

FIG. 17 shows an aerial work vehicle 77 in which two sets of the five-stage telescopic boom devices shown in FIG. 9 are connected in series via a folding cylinder device 76.

[0053]

According to the present invention, the boom extension/retraction cylinder device is connected between the first boom and the second boom, which are the tip end booms, and the space occupied by the boom extension/retraction cylinder device is used for cables, etc. By sharing the structure with the second boom extension cable and the second boom extension cable, there is no need for a separate space for arranging cables, etc. and the second boom extension cable within the boom from the space for arranging the boom extension/retraction cylinder device. This makes it possible to reduce the cross-sectional area of the boom, so it is possible to reduce the amount of overlap of the telescopic boom device even when using multiple stages of four or more stages. There are economic advantages in making it possible to mount boom devices.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal sectional view of a three-stage telescopic boom device according to the invention.

FIG. 2 is a schematic vertical sectional view showing the three-stage telescopic boom device shown in FIG. 1 in an extended state.

FIG. 3 is a schematic vertical sectional view showing a modification of the three-stage telescopic boom device shown in FIG. 1;

FIG. 4 is a schematic longitudinal sectional view of a four-stage telescopic boom device according to the present invention.

FIG. 5 is a schematic vertical sectional view showing the four-stage telescopic boom device shown in FIG. 4 in an extended state.

FIG. 6 is a schematic vertical sectional view showing a modification of the four-stage telescopic boom device shown in FIG. 4 in an extended state.

FIG. 7 is a schematic longitudinal sectional view of a five-stage telescopic boom device according to the present invention.

8 is a schematic vertical sectional view showing the five-stage telescopic boom device shown in FIG. 7 in an extended state; FIG.

9 is a schematic vertical sectional view showing a modification of the five-stage telescopic boom device shown in FIG. 7. FIG.

10 is a schematic vertical sectional view showing another modification of the five-stage telescopic boom device shown in FIG. 7. FIG.

FIG. 11 is a schematic longitudinal sectional view showing an embodiment in which a five-stage telescopic boom device is constructed by combining two sets of three-stage telescopic booms according to the present invention.

FIG. 12 is a schematic vertical sectional view showing the five-stage telescopic boom device shown in FIG. 11 in an extended state.

13 is a schematic vertical sectional view of the boom telescoping cylinder device shown in FIG. 1. FIG.

14 is a sectional view taken along line AA in FIG. 7. FIG.

15 is a sectional view taken along line BB in FIG. 7. FIG.

FIG. 16 is a schematic side view showing an example in which the five-stage telescopic boom device according to the present invention is applied to an aerial work vehicle.

17 is a schematic side view showing an example of an aerial work vehicle using two sets of the five-stage telescopic boom device shown in FIG. 9. FIG.

[Explanation of symbols]

1 First boom 2 Second boom 3 Third boom 4 Fourth boom 5 Fifth boom 6 Boom extension/contraction cylinder device 7 Cylinder 8 Base end pin 9 Piston rod 10 Tip pin 12 Second boom extension cable 13 Cable stopper 14 Sliding Axle 15 Second boom extension pulley 16 Connecting member 17 Rope stopper 18 Support shaft 19 Support sliding member 20 Cable 21 Cable guide 24 Work box balancing cylinder device 25 Second boom reduction rope 26 Rope stopper 27 Pulley shaft 28 Second boom retraction pulley 29 Rope stopper 30 Upper guide support roller 31 Lower guide support roller 32 Third boom extension cable 33 Cable stopper 34 Pulley shaft 35 Third boom extension pulley 36 Cable stopper 37 Third boom retraction Small rope 38 Rope stopper 39 Pulley shaft 40 Third boom retraction pulley 41 Rope stopper 45 Cylinder device 46 for third boom extension and contraction Cylinder 47 Support shaft 48 Piston rod 49 Rear end pin 50 Support fitting 51 Fourth boom extension rope 52 Rope stopper 53 Pulley shaft 54 Fourth boom extension pulley 55 Rope stopper 56 Fourth boom reduction rope 57 Rope stopper 58 Pulley shaft 59 Fourth boom retraction pulley 60 Rope stopper 61 Piston 62 Extension side oil Chamber 63 Center oil passage 64 Reduction side oil chamber 65 Outer annular oil passage 67 Cable pulley 70 Aerial work vehicle 71 Lifting cylinder device 72 Balance cylinder device 73 Work box 74 Winch motor 75 Manipulator 76 Folding cylinder device 77 High place Work vehicle 106 Boom extension cylinder device 107 Cylinder 108 Base end pin 109 Piston rod 110 Tip pin 112 Boom extension cable 113 Cable stopper 114 Pulley shaft 115 Boom extension pulley 116 Connection member 117 Cable stopper 118 Support shaft 119 Support sliding Member 120 Connection flange

Claims (10)

[Claims] [Claim 1] A first boom constituting a tip boom;
a second boom that telescopically inserts the first boom; a third boom that telescopically inserts the second boom;
A boom telescoping cylinder device connected between the inner wall of the boom and the rear end inner wall of the second boom and interposed between the first and second booms; a connecting member whose rear end is connected to the inner wall of the rear end of the third boom and extends into the first, second and third booms substantially parallel to the axis of the boom telescoping cylinder device; and the boom; It has an outer diameter larger than the outer diameter of the boom telescoping cylinder device attached to the rear end of the second boom on substantially the same axis as the telescoping cylinder device and at a position rearward from the rear end of the boom telescoping cylinder device. a second boom extension pulley; one end of which is fixed to the front end of the first boom; the cylinder device extends along one side of the boom extension cylinder device, passes around the second boom extension pulley; and a boom extension cylinder device; a second boom extension cable whose other end is fixed to the front end of the connecting member after being extended along the other side; a second boom retraction pulley attached to the front end of the second boom; One end is fixed to the rear end of the first boom, is extended between the first boom and the second boom, passes around the second boom retraction pulley, and the other end is attached to the third boom. A multi-stage telescopic boom device having a basic configuration of a three-stage telescopic boom structure comprising a second boom retractable cable fixed to a second boom retractable rope. 2. A cable pulley extending from the front end of the first boom along one side of a cylinder device for boom extension and retraction, and passing around a cable pulley provided coaxially with a second boom extension pulley. The device according to claim 1, further comprising a cable extending along the other side of the cylinder device and extending from a cable guide at the front end of the connecting member toward the rear end of the third boom. 3. Claim 1, wherein the connecting member has a gutter shape and guides and supports a plurality of cables in parallel.
The device described. 4. The device according to claim 1, wherein a front end portion of the connecting member is slidably supported by the crane telescoping cylinder device. 5. The apparatus of claim 1, wherein the front end of the connecting member is guided and supported on the inner wall of the first boom by guide and support rollers. 6. The apparatus according to claim 1, wherein the third boom is a proximal boom of a three-stage telescoping boom apparatus. 7. A fourth boom is telescopically inserted into the third boom, a third boom extension pulley is attached to a rear end of the third boom, and a third boom extension pulley is attached to a front end of the third boom. A retraction pulley is attached, and a third boom extension cable is fixed at one end to the rear end of the second boom and is extended between the third and fourth booms via the third boom extension pulley. The other end of the third boom reduction cable is fixed to the front end of the fourth boom, and one end of the third boom reduction cable is fixed to the rear end of the second boom.
6. The device according to claim 1, wherein the other end of the boom is secured to the front end of the fourth boom via a pulley for retracting the boom, forming a four-stage telescopic boom structure. 8. The third boom includes a fourth boom that is telescopically inserted therein, and the connecting member is constituted by a cylinder of a cylinder device for extending and retracting the third boom, and the rear end of the piston rod of the cylinder device is connected to the fourth boom. The device according to any one of claims 1, 2, 4, and 5, wherein the device is connected to the inner wall of the rear end of the four booms to constitute a four-stage telescopic boom device. 9. The fourth boom includes a fifth boom telescopically inserted therein, a fourth boom extension pulley is attached to the rear end of the fourth boom, and a fourth boom extension pulley is attached to the front end of the fourth boom. A retraction pulley is attached, and a fourth boom extension cable is fixed at one end to the rear end of the third boom and is extended between the fourth and fifth booms via the fourth boom extension pulley. The other end is fixed to the front end of the fifth boom, and one end of the fourth boom retraction cable is fixed to the rear end of the third boom and extended between the third and fourth booms to retract the fourth boom. 9. The device according to claim 7, wherein the other end of the boom is secured to the front end of the fifth boom after passing around the small pulley to form a five-stage telescopic boom structure. 10. The three-stage telescopic boom structure according to claim 1, the four-stage telescopic boom structure according to claim 7, and the four-stage telescopic boom structure according to claim 8.
A multi-stage telescopic boom device comprising a stage telescopic boom structure or a combination of a five-stage telescopic boom structure according to claim 9 and a three-stage telescopic boom structure according to claim 1.