JP2545163B2 - Multi-stage telescopic boom device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a multi-stage telescopic boom device,
In particular, it relates to a multi-stage telescopic boom device for an aerial work vehicle.

[0002]

2. Description of the Related Art Generally, in a multistage telescopic boom device for an aerial work vehicle, a hydraulic hose, electric wiring, etc. (collectively referred to as cables in this specification) are attached to a boom in a high place work box located at the tip of the multistage telescopic boom. It is necessary to guide from the proximal side.

Conventionally, as a means for guiding a cable or the like from a base end boom of a multi-stage telescopic boom to a working box at the tip of the tip boom, for example, as disclosed in Japanese Patent Laid-Open No. 62-205840, the cable or the like is telescopic boom. As disclosed in Japanese Utility Model Publication No. 62-25513,
A method of passing a cable or the like inside the telescopic boom is known.

The former method has a practical problem that the cable or the like is often damaged externally, and as a result, the work at a high place in the work box is interrupted or an unexpected disaster is likely to occur.

On the other hand, in the latter structure, which is disclosed in Japanese Utility Model Publication No. 62-25513, in which the cables and the like are arranged inside the boom, there is no problem that the cables and the like are externally damaged, but A space for just passing the telescopic boom device is provided above the boom telescopic cylinder device, and means for guiding the cables and the like for passing cables and pulleys are arranged in the upper space. When attempting to increase the number of stages, the boom cross section inevitably increases in size, and as a result, the weight of the telescopic boom device increases, it is necessary to increase the size of the undercarriage vehicle to achieve stable balance.
There was an economic problem.

[0006]

SUMMARY OF THE INVENTION The present invention provides a multi-stage telescopic boom device for an aerial work vehicle in which a cable or the like is passed through the telescopic boom, and the boom cross section is enlarged even when the number of stages is four or more. It is an object of the present invention to provide a multi-stage telescopic boom device that does not need to be installed.

[0007]

According to the present invention, there is provided a first boom which constitutes a tip boom, a second boom which telescopically inserts the first boom, and a telescopically insertable second boom. A third boom, a boom telescopic cylinder device connected between the inner wall of the first boom and a rear end inner wall of the second boom and interposed between the first and second booms, and the boom telescopic cylinder device. The rear end portion is connected to the inner wall of the rear end portion of the third boom at a lower position of the boom cylinder device and extends into the first, second and third booms substantially parallel to the axis of the boom telescopic cylinder device. The connecting member and the boom telescopic cylinder device mounted on the rear end portion of the second boom at substantially the same axis as the boom telescopic cylinder device and at a position rearward of the rear end of the boom telescopic cylinder device. Second boom with an outer diameter larger than the diameter The long pulley and one end of which is fixed to the front end portion of the first boom and extends along one side of the boom telescopic cylinder device, and extends around the second boom extension pulley and the other side of the boom telescopic cylinder device. And a second boom extension cable attached to the front end of the second boom, and a second boom reduction pulley attached to the front end of the second boom. It is attached to the rear end of one boom,
A second boom reduction rope that extends between the first boom and the second boom and extends around the booms, passes around the second boom reduction pulley, and has the other end fixed to the third boom. It is characterized by having a three-stage telescopic boom structure as a basic structure.

According to the present invention, a boom telescopic cylinder device, a hydraulic hose for hydraulic equipment in an aerial work box, a cable such as electric wiring, and the like are provided from the front end portion of the first boom to one side of the boom telescopic cylinder device. Extending along the other side of the boom telescopic cylinder device through a cable pulley provided coaxially with the second boom extending pulley, and extending from the cable guide at the front end of the connecting member to the first side. It is recommended to extend it toward the rear end of the boom.

Further, according to the present invention, the third boom comprises a fourth boom in which the third boom is telescopically inserted, the third boom extending pulley is attached to the rear end of the third boom, and the third boom is attached to the front end of the third boom. A third boom reduction pulley is attached, and one end of the third boom extension cable is fixed to the rear end of the second boom and extends between the third and fourth booms around the third boom extension pulley. Then, the other end is fastened to the front end of the fourth boom, and the third boom reduction rope is fastened to the rear end of the second boom at one end thereof to pass through around the third boom reduction pulley and It is preferable that the other end is fixed to the front end of the four boom to form a four-stage telescopic boom structure.

A fifth boom into which the fourth boom is telescopically inserted is provided, a fourth boom extension pulley is attached to the rear end of the fourth boom, and a fourth boom reduction unit is attached to the front end of the third boom. Attach the pulley for the 4th boom extension line at the 3rd end
It is attached to the rear end of the boom, extends around the fourth boom extension pulley and extends between the fourth and fifth booms, and the other end is attached to the front end of the fifth boom to reduce the fourth boom. The rope is fastened at one end to the rear end of the second boom, extends between the third and fourth booms, passes around the fourth boom reduction pulley, and the other end is fastened to the front end of the fifth boom. It is preferable to wear them to form a five-stage telescopic boom structure.

[0011]

According to the present invention, the boom telescopic cylinder device is connected and provided between the first boom and the rear end of the second boom, which are the tip booms, and the first boom is telescopically extended by the boom telescopic cylinder device. The second boom extension pulley is attached to the rear end of the second boom at a position rearward of the rear end of the boom extension cylinder device, and the outer diameter of the second boom extension pulley is set to the boom extension cylinder device. The second boom extension is provided by providing a connecting member that is larger than the outer diameter of the cylinder and that connects the rear end of the third boom to the rear end of the third boom and extends in parallel to the lower side of the boom telescopic cylinder device. The rope is passed through the boom telescopic cylinder device at the upper and lower sides thereof, and the cable and the like are passed at the upper and lower sides of the boom telescopic cylinder device in parallel with the second boom extension cable. It can be shared with the space for arranging the boom telescopic cylinder unit a space required for disposing the, thus, it is possible to reduce the boom cross-sectional area.

Further, according to the present invention, a five-stage telescopic boom device is obtained by connecting two sets of the three-stage telescopic boom structure having the basic structure described in claim 1 in series, and further connecting three sets in series. By doing so, a 7-stage telescopic boom device is connected in series to obtain a 9-stage telescopic boom device. In this way, a (2n + 1) -step telescopic boom device can be configured with n 3-step telescopic boom structures.

Furthermore, the base end side three-stage telescopic boom in a multi-stage telescopic boom device having a five-stage telescopic boom structure obtained by connecting two sets of the three-stage telescopic boom structure of the basic construction according to claim 1 in series. The structure is claimed in claim 7 or 8.
A 6-step telescopic boom device can be obtained by adopting the 4-step telescopic boom structure described in (1).

Furthermore, the base end side three-stage telescopic boom in a multi-stage telescopic boom device having a five-stage telescopic boom structure obtained by connecting two sets of the three-stage telescopic boom structure of the basic construction according to claim 1 in series. A 7-step telescopic boom device can be obtained by using the 5-step telescopic boom structure according to claim 9 as the structure.

[0015]

1 and 2 show an embodiment of a three-stage telescopic boom device as a 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 step retractable boom device, a first boom 1 which is a tip boom, a second boom 2 and a third boom 3 which is a base end boom are sequentially slidably externally inserted, and the first boom 1 and the second boom 2 are attached.
Boom telescopic cylinder device 6 is provided between and. This boom telescopic cylinder device 6 has its cylinder 7
The base end of the second boom 2 is connected to the inner wall of the rear end of the second boom 2 by a base pin 8, and the tip of the piston rod 9 is connected to an appropriate position on the inner wall of the first boom 1 by a tip pin 10. As a result, the first boom 1 that is the tip boom can be expanded and contracted with respect to the second boom 2 by expanding and contracting the boom expanding and contracting cylinder device 6.

Since the second boom 2 is simultaneously extended from the third boom 3 in conjunction with the extension operation of the boom telescopic cylinder device 6 described above, the second boom extension cable 12 has its one end 12A at the first boom 1. On the inside of the tip of the
Of the boom expansion / contraction cylinder device 6 along the boom expansion / contraction cylinder device 6 and on the upper side thereof. Rear end, ie cylinder 7
Around the second boom extension pulley 15 on the 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, and folded back around the second boom extension pulley 15 and along the boom telescopic cylinder device 6. And a boom extension cylinder device 6 extending from the rear end portion of the third boom 3 which is a base end boom to a lower position thereof.
A cable rear end 12B is fixed to a cable stopper metal fitting 17 provided at a front end portion of a connecting member 16 extending along the lower side thereof.

The second boom extension pulley 15 is, as described above, substantially on the same axis as the boom telescopic cylinder device 6 and at a position rearward of the boom telescopic cylinder device 6 at the rear end portion of the second boom 2. The boom extension cable 12 has a larger outer diameter than the outer diameter of the cylinder 7 of the boom telescopic cylinder device 6 in order to return the boom extension cable 12 from the upper position to the lower position of the boom telescopic cylinder device 6 as described above.

The connecting member 16 is for transmitting the extension operation of the boom telescopic cylinder device 6 to the third boom 3 via the boom extension cable 12 as described above. Therefore, as shown in the figure, the connecting member 16 has its rear end portion 16A having a support pin 18
Is connected and supported by the inner wall of the rear end of the third boom 3 which is the base end boom, and a supporting slide member 19 is fixed to the front end 16B, which slides on the cylinder 7 of the boom telescopic cylinder device 6. It is movably supported (see FIG. 15), and the support sliding member 19 is provided with a cord 17.

As described above, the connecting member 16 is a support pin.
Although it is provided extending from 18 at a position below the cylinder 7 of the boom telescopic cylinder device 6 in parallel with the cylinder 7, the support pin 18 is substantially positioned in the horizontal axis direction of the stopper 17 of the second boom extension cable 12. As a result, it is configured to suppress the vertical component force generated by the second boom extension cable 12 on the support sliding member 19 and reduce the sliding resistance of the support sliding member 19.

The connecting member 16 has a cable 20 laid thereon, and a cable guide 21 provided at the tip of the connecting member 16 is folded back so that the cable 20 can be laid inside the connecting portion 16 again. Shape (see Figure 14)
. The cable 20 is a pulley 1 provided at the rear end of the second boom 2.
It is passed around 5 and is connected to the boom telescopic cylinder device 6, the work box balancing cylinder device 24, and other hydraulic equipment in the work box through the guide rollers 22 and 23 provided at the tip of the first boom 1. To be done.

Numeral 25 is a second boom reduction cable, the front end of which is the first
The second boom reduction pulley 28 on the pulley shaft 27 provided at the front end of the second boom 2 is fastened to a cable stopper 26 provided at the rear end of the boom 1 and from the cable stopper 26. It is fixed to the front end portion of the third boom 3 by means of a cord stopper 29 after passing around.

The three-stage telescopic boom device having the above construction is
During boom extension operation, the piston rod 9 of the boom telescopic cylinder device 6 extends due to hydraulic pressure, so that the first boom 1 that is the tip boom extends beyond the second boom 2. By this extension, the second boom extension cable 12 is pulled,
This pulling force is transmitted to the third boom 3 via the connecting member 16, and the second boom 2 is interlockedly extended from the third boom 3.

In other words, the extension operation described above is performed by the extension of the piston rod 9 of the boom telescopic cylinder device 6.
The first boom 1 extends to the second boom 2, and the second boom 2 extends to the third boom 3. These extension operations are the second
The boom extension cable 12 is interlocked with the boom extension operation. Extension stroke of each boom, that is, third boom 3
The extension stroke of the second boom 2 and the extension stroke of the second boom 2 and the first boom 1 have the same dimension length.

Further, when the boom is reduced, the piston rod 9 of the boom expanding / contracting cylinder 6 is reduced by hydraulic pressure, so that the tip boom 1 is reduced inside the second boom 2. Due to this reduction, the second boom reduction rope 25 is pulled and the second boom 2 is reduced into the third boom 3.

In other words, the above-described reduction operation is performed by reducing the piston rod 9 of the boom telescopic cylinder device 6 so that the second boom 2 is reduced to the outside of the first boom 1 and the outside of the second boom 2. Then, the third boom 3 will be reduced. The reduced 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 tip side end portion 16B of the connecting member 16
Attach the vertical guide support rollers 30 and 31 to the first boom 1
It is configured to be able to roll along the upper and lower inner walls 1A, 1B, and thereby to support the tip end portion 16B of the connecting member 16.

4 and 5 show an example in which the present invention is applied to a 4-stage telescopic boom device. The structure of the first boom 1, the second boom 2 and the third boom 3, which are the tip booms of the four-stage telescopic boom device shown in FIG.
As is apparent with reference to FIG. 1, it is basically the same as the three-stage telescopic boom device, and therefore the same components as in FIG.
The same reference numerals are used for the description, and the detailed description thereof is omitted.

In the illustrated example, the fourth boom constituting the proximal boom
The third boom 3 is slidably inserted inside the boom 4.

A third boom extension cord 32 is provided to extend the third boom 3 in conjunction with the extension operation of the second boom 2, and the tip 32A of the third boom extension cord 32 is attached to the rear end of the second boom 2 as a cord stopper.
The rear end 32B is fixed by 33 and is passed through the third boom extending pulley 35 rotatably attached to the rear end of the third boom 3 by the pulley shaft 34 from the cord 33. It is fixed to the front end of the fourth boom 4 by a metal fitting 36.

A third boom reduction rope 37 for reducing the third boom 3 in conjunction with the reduction operation of the second boom 2 is provided, and a rope tip 37A is provided at the rear end of the second boom 2. It is fastened by the rope stopper metal fitting 38, and the rope rear end 37B is passed from the rope stopper metal fitting 38 to the front end of the third boom 3 around the third boom reduction pulley 40 rotatably attached by the pulley shaft 39, 4 It is fixed to the front end of the boom 4 by a cable stopper 41.

The 4-stage telescopic boom device having the above-mentioned structure is
At the time of the extension operation, as described above for the three-stage telescopic boom device, as shown in FIG. 5, the extension operation of the boom telescopic cylinder device 6 causes the first boom 1 as the tip boom to extend forward from the second boom 2. As a result, the second boom extension cable 12 and the connecting member 16 cause the second boom 2 to extend forward from the third boom 3, and further the third boom 3 to the third boom.
The boom extension cord 32 pulls out and extends from the fourth boom 4, which is the proximal boom.

When the 4-stage telescopic boom device is contracted, the boom telescopic cylinder device 6 is contracted.
At the same time that the first boom 1 which is the tip boom is contracted from the extended state shown in FIG. 5 to the contracted state shown in FIG. 4, at the same time, the second and third booms 2 and 3 are linked to the second and third booms. 3 Boom reduction rope 25 and 37
Reduced into boom 4.

FIG. 6 shows a fourth base boom in FIG.
An example in which the telescopic means of the third boom 3 slidably inserted into the boom 4 is constituted by the telescopic cylinder device 45 is shown. In this example, the third boom telescopic cylinder device 45 is shown in FIG.
In place of the connecting member 16 in the embodiment shown in FIG. 5, that is, the rear end of the cylinder 46 is connected to the rear end of the third boom 3 by the support shaft 47, and 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 base boom, by a rear end pin 49. The front end of the cylinder 46 is attached to the lower end of the cylinder 46 by the same supporting sliding member 19 as described above, and the boom telescopic cylinder device 6 is attached.
The rear end of the second boom extension cable 12 is fixed to the cable stopper 17 provided on the support sliding member 19. In this example,
The cable 20 is laid on the side surface of the cylinder 46 by a support fitting 50.

By constructing as shown in FIG. 6,
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, and the cable stopper can be omitted.

7 and 8 show an example in which the multi-stage telescopic boom device according to the present invention is applied to a 5-stage telescopic boom device. The structure 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 five-stage telescopic boom device shown in the figure, and the telescopic means of these booms will be apparent with reference to FIG. 4 is basically the same as the 4-stage telescopic boom device, and therefore, the same components as those in FIG. 4 are designated by the same reference numerals as those in FIG. 4, and detailed description thereof is omitted.

In the illustrated example, the fifth boom forming the base end boom is formed.
As a means for slidably inserting the fourth boom 4 inside the boom 5 and extending the fourth boom 4 with respect to the fifth boom 5, the front end of the fourth boom extension cord 51 is attached to the rear end of the third boom 3. The fourth boom extension rope 51 is passed around the fourth boom extension pulley 54 attached to the pulley shaft 53 provided at the rear end of the fourth boom 4 by the rope stopper metal fitting 52. 5th boom 5
When the third boom 3 is extended from the fourth boom 4 by being attached to the cable stopper 55 at the front end of the fourth boom 4,
Are linked and extend from the fifth boom 5, which is the base boom.

Further, as means for reducing the fourth boom 4 with respect to the fifth boom 5, a fourth boom is provided at the rear end of the third boom 3.
The front end of the boom reduction rope 56 is fixed by a rope stopper 57, and it is a proximal boom after passing around the fourth boom reduction pulley 59 on the pulley shaft 58 supported by the front end of the fourth boom 4. 5 Fasten it to the front end of the boom 5 with a cable stopper 60. As a result, when the third boom 3 is contracted into the fourth boom 4, the fourth boom 4 is interlocked with the contraction operation to be contracted into the fifth boom 5, which is the base boom. There is.

The operation of the 5-stage telescopic boom device shown in FIG. 7 having the above structure will be described. When the boom is extended, the piston rod 9 of the boom expanding / contracting cylinder device 6 is extended by hydraulic pressure so that the first boom 1 as the tip boom is moved to the second boom.
Extends from boom 2. Due to this extension, the second boom extension cord 12 is pulled, and this pulling force is applied to the third boom via the connecting member 16.
It is transmitted to the boom 3, and the second boom 2 is interlockedly extended from the third boom 3. By this extension, the third boom extension cord 32 is pulled, and the fourth boom 4 and the third boom 3 are interlocked and extended. Further, due to this extension, the fourth boom extension cord 51 is pulled, and the fifth boom 5 to the fourth boom 4 which are the base booms.
Will be linked and expanded.

As described above, when the boom is extended, the extension operation of the boom telescopic cylinder device 6 causes the first boom 1 to move.
From the second boom 2, the extension of the third boom 3 from the second boom 2, the extension of the fourth boom 4 from the third boom 3, the fifth boom 5 which is the proximal boom from the fourth boom 4.
Will be extended. The extension operation of these booms is
The extension strokes of the booms, that is, the extension strokes of the fifth boom 5 and the fourth boom 4, the extension strokes of the fourth boom 4 and the third boom 3, and the third boom 3 are generated simultaneously by the interlocking operations of 2, 32, and 51. The extension stroke of 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 contracted, the piston rod 9 of the boom expanding / contracting cylinder device 6 is contracted by the hydraulic pressure, so that the first boom 1 as the tip boom is contracted inside the second boom 2. By this reduction operation, the second boom reduction rope 25 is pulled, and the second boom 2 is reduced into the third boom 3. Further, due to this reduction, the third boom reduction rope 37 is pulled, and the third boom 3 is reduced into the fourth boom 4. Furthermore, due to this reduction, the fourth boom reduction rope 56 is pulled,
The fourth boom 4 contracts into the fifth boom 5, which is the base boom.

As described above, when the boom is contracted, the second boom 2 is contracted outside the first boom 1 and the third boom is contracted outside the second boom due to the contraction of the piston rod 9 of the boom telescopic cylinder device 6. 3 reduction, 4th boom 4 reduction outside the 3rd boom 3, 5th boom 5 outside the 4th boom 4.
, But these reduced strokes have the same dimensions for each boom.

FIG. 9 shows a modification of the five-stage telescopic boom device shown in FIG. 7. In this example, the second, third, and fourth boom reduction pulleys 28, 40, and 59 are connected to the second, third, and third booms. 4 booms 2, 3 and 4
Are supported on the pulley shafts 27, 39, 58 planted on the inner wall of the boom so that they are located inside the tip of the boom, so that when the boom is extended, the second, third, and fourth boom reduction cords 25, 37,
56 is located inside the boom.

FIG. 10 shows a modification of the embodiment shown in FIG. 8 in which the telescopic means of the third boom 3 is constituted by a telescopic cylinder device 45 as shown in FIG.

11 and 12 show an embodiment in which two sets of the three-stage telescopic boom device shown in FIG. 1, which is the basic structure 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 expanding / contracting means of the three-stage boom expanding / contracting device on the tip side provided between the first, second and third booms 1, 2 and 3, ie, the boom expanding / contracting cylinder device 6 and the boom extension cable. 12, add 100 to the sign of the boom reduction rope 25 and the connecting member 16 and its related parts,
The boom extending / contracting means of the three-stage boom extender / contractor 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 telescopic devices, the coupling flange 120 provided on the connecting member 16 of the three-stage boom telescopic device on the tip side is connected to the boom telescopic cylinder device 106 of the three-stage boom telescopic device on the proximal side. The tip of the piston rod 109 is connected by a tip pin 110.

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

Further, in the 5-stage telescopic boom device shown in FIG. 11, a 6-stage telescopic boom device is combined by combining the 4-stage telescopic boom device shown in FIG. 4 or 6 in place of the 3-stage telescopic boom device on the base end side. A boom device can be used, and similarly, a 5-stage telescopic boom device shown in FIG. 7 or FIG. 10 can be combined in place of the 3-stage telescopic boom device on the proximal end side to form a 7-stage telescopic boom device. it can.

As described above, the multi-stage telescopic boom device according to the present invention is basically the three-stage telescopic boom device shown in FIG.
By appropriately combining the 4-stage telescopic boom device shown in FIG. 4 or 6 and the 5-stage telescopic boom device shown in FIG. 7 or 10, a multistage telescopic boom device having a desired number of stages can be obtained.

FIG. 13 shows an example of a boom expanding / contracting cylinder device 6. In the illustrated example, a slidable piston rod 9 is formed of a hollow rod in a cylinder 7, and a center of the piston 61 is communicated with an extension side oil chamber 62. An oil passage 63 and an outer annular oil passage which is provided concentrically outside the oil passage 63 and communicates with the reduction side oil chamber 64 of the piston 61.
And 65 are formed on the piston rod 9.

FIG. 14 is a sectional view taken along line AA of FIG. 7 as seen in the direction of the arrow, and FIG. 15 is a sectional view taken along line BB of FIG. 7 as seen in the direction of the arrow. As shown in the figure, the connecting member 16 has a gutter 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 multistage telescopic boom device according to the present invention is applied to an aerial work vehicle 70. In FIG. 16, 71
Is a hoisting cylinder device, and 72 is a balance cylinder device which is forcibly moved by hoisting operation of the multistage telescopic boom device by the hoisting cylinder device. In the balance cylinder device 72, the work box balance cylinder device 24 and each oil chamber are communicated with each other, and therefore, the work box balance cylinder device 24 is driven by the movement of the balance cylinder device 72, whereby the work box 73 is balanced. It is being taken. In the figure, 74 is a winch motor, and 75 is a manipulator.

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

[0053]

According to the present invention, the boom expanding / contracting cylinder device is provided so as to be connected between the first boom and the second boom, which are tip booms, and the space occupied by the boom expanding / contracting cylinder device is provided by a cable or the like. Since it is configured to be shared with the second boom extension cable, the space for arranging the cables and the second boom extension cable in the boom is not required separately from the space for disposing the boom telescopic cylinder device. As a result, since the boom cross-sectional area can be reduced, the increase in the overlap of the telescopic boom device can be reduced even when the number of stages is four or more, and the multi-stage telescopic extension of four or more stages can be performed on a relatively small undercarriage. There is an economic advantage that allows the boom device to be installed.

[Brief description of drawings]

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

FIG. 2 is a schematic vertical cross-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 modified example of the three-stage telescopic boom device shown in FIG.

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

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

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

FIG. 7 is a schematic vertical sectional view of a 5-step telescopic boom device according to the present invention.

8 is a schematic vertical cross-sectional view showing the 5-stage telescopic boom device shown in FIG. 7 in an extended state.

9 is a schematic vertical sectional view showing a modified example of the 5-stage telescopic boom device shown in FIG.

FIG. 10 is a schematic vertical cross-sectional view showing another modified example of the 5-stage telescopic boom device shown in FIG. 7.

FIG. 11 is a schematic vertical sectional view showing an embodiment in which two sets of three-stage telescopic booms according to the present invention are combined to form a five-stage telescopic boom device.

12 is a schematic vertical cross-sectional view showing the 5-stage telescopic boom device shown in FIG. 11 in an extended state.

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

14 is a cross-sectional view taken along the line AA of FIG.

15 is a cross-sectional view taken along the line BB of FIG.

FIG. 16 is a schematic side view showing an example in which the 5-stage telescopic boom device according to the present invention is applied to an aerial work vehicle.

FIG. 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.

[Explanation of symbols]

 1 1st boom 2 2nd boom 3 3rd boom 4 4th boom 5 5th boom 6 Boom expansion / contraction cylinder device 7 Cylinder 8 Base pin 9 Piston rod 10 Tip pin 12 Second boom extension cable 13 Locking metal fitting 14 Sliding Axle 15 Second boom extension pulley 16 Connection member 17 Cable stopper 18 Support shaft 19 Support sliding member 20 Cable 21 Cable guide 24 Work box balancing cylinder device 25 Second boom reduction cable 26 Cable stopper 27 Pulley shaft 28 Pulley for second boom reduction 29 Cable stopper 30 Upper guide support roller 31 Lower guide support roller 32 Third boom extension cable 33 Cable stopper 34 Pulley shaft 35 Cable for third boom extension 36 Cable stopper 37 Third boom compression Shaft rope 38 Rail stop metal 39 Pulley shaft 40 Third boom reduction pulley 41 Rail stop metal 45 Third boom telescopic cylinder device 46 Cylinder 47 Support shaft 48 Piston rod 49 Rear end pin 50 Support metal fitting 51 Fourth bracket Extension cable 52 Cable stopper 53 Pulley shaft 54 4th boom extension pulley 55 Cable stopper 56 4th boom reduction cable 57 Cable stopper 58 Pulley shaft 59 4th boom compression pulley 60 Cable stopper 61 Piston 62 Extension side oil chamber 63 Central oil passage 64 Reduction side oil chamber 65 Outer annular oil passage 67 Cable pulley 70 Aerial work vehicle 71 Elevating cylinder device 72 Balancing cylinder device 73 Work box 74 Winch motor 75 Manipulator 76 Folding cylinder device 77 Aerial work vehicle 106 Cylinder device for boom extension and contraction 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)

(57) [Claims] 1. A first boom that constitutes a tip boom, a second boom that telescopically inserts the first boom, a third boom that telescopically inserts the second boom, and a first boom. Of the boom telescopic cylinder device, which is connected between the inner wall of the first boom and the second boom, and is inserted between the first and second booms. A connecting member whose 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 telescopic cylinder device;
An outer diameter larger than the outer diameter of the boom telescopic cylinder device mounted on the rear end of the second boom on the substantially same axis as the boom telescopic cylinder device and at a position rearward of the rear end of the boom telescopic cylinder device. A second boom extending pulley, and one end of the first boom is fastened to the front end of the first boom and extends along one side of the boom extending / contracting cylinder device to extend around the second boom extending pulley for boom extension / contraction. A second boom extension cable having the other end fixed to the front end of the connecting member after being extended along the other side of the cylinder device, and a second boom reduction pulley attached to the front end of the second boom. And one end is first
It is fixed to the rear end of the boom, extends between the first boom and the second boom along these booms, passes around the second boom reduction pulley, and the other end is fixed to the third boom. Second
A multi-stage telescopic boom device having a basic configuration of a three-stage telescopic boom structure including a boom reduction rope. 2. A boom telescopic unit extending from a front end portion of the first boom along a side of the boom telescopic cylinder device and around a cable pulley coaxially provided with a second boom extending sheave unit. A cable or the like that extends along the other side of the cylinder device and extends from the cable guide at the front end of the connecting member toward the rear end of the third boom.
The described device. 3. The device according to claim 1, wherein the connecting member has a gutter shape, and a plurality of cables are arranged in parallel and guided and supported. 4. The front end portion of the connecting member is slidably supported by the crane telescopic cylinder device.
The described device. 5. The apparatus according to claim 1, wherein a front end portion of the connecting member is guided and supported by a guide supporting roller on an inner wall of the first boom. 6. The device according to claim 1, wherein the third boom is a proximal boom of a three-stage telescopic boom device. 7. The third boom comprises a fourth boom in which the third boom is telescopically inserted, a third boom extension pulley is attached to the rear end of the third boom, and the third boom is attached to the front end of the third boom. A reduction pulley is attached and a third boom extension cable is secured at one end thereof to the rear end of the second boom and extends between the third and fourth booms around the third boom extension pulley. The other end is fastened to the front end of the fourth boom, and the third boom reduction rope is fastened to the rear end of the second boom at one end thereof to pass around the third boom reduction pulley to reach the fourth boom. The apparatus according to any one of claims 1 to 5, wherein the other end is fixed to the front end of the tongue to form a four-stage telescopic boom structure. 8. A fourth boom, into which the third boom is telescopically inserted, wherein the connecting member comprises a cylinder of a third boom telescopic cylinder device, the rear end of a piston rod of the cylinder device being the first. The device according to any one of claims 1, 2, 4, and 5, which is connected to an inner side wall of a rear end portion of the four boom to form a four-stage telescopic boom device. 9. The fourth boom comprises a fifth boom in which the fourth boom is telescopically inserted, a fourth boom extension pulley is attached to a rear end of the fourth boom, and a fourth boom is attached to a front end of the fourth boom. A reduction pulley is attached, a fourth boom extension cable is fixed at one end to the rear end of the third boom, extends around the fourth boom extension pulley, and extends between the fourth and fifth booms. The other end is fixed to the front end of the fifth boom, and the fourth boom reduction rope is fixed to the rear end of the third boom at one end thereof and is extended between the third and fourth booms to reduce the fourth boom. 9. The device according to claim 7 or 8, wherein the other end of the fifth boom is fastened to the front end portion of the fifth boom after passing around the low-priced pulley to form a five-stage telescopic boom structure. 10. A three-stage telescopic boom structure according to claim 1,
A multi-stage telescopic boom device in which the 4-stage telescopic boom structure according to claim 7, the 4-stage telescopic boom structure according to claim 8 or the 5-stage telescopic boom structure according to claim 9 is combined with the 3-stage telescopic boom structure according to claim 1. .