JPH05338997A - Cable extension/contraction unit of multistage telescopic boom - Google Patents

Abstract

PURPOSE:To provide a cable extension/contraction unit applicable to the boom telescopic unit of a vehicular crane having various telescopic ways. CONSTITUTION:A cable extension/connection unit of a multistage telescopic boom is arranged in such a way that a plurality of cases 21, 22, 23, 24 and 25 which are respectively supported in suspension by telescopically engaged plurality of booms 11, 12, 13, 14 and 15 of a multistage telescopic boom unit and are telescopically engaged, and the tip end of the first cable 18 for supplying energy is connected to a cable connector 19 set at the tip end of the basic end case 21, one end of the second cable is connected to the cable connector 19 and the other end is connected to a cable connector set at the rear end of the third stage case 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic device for a cable or the like of a multi-stage telescopic boom device, and more particularly to a multi-stage telescopic boom for aerial work in which a work device such as an aerial work box is provided at the tip of the multi-stage telescopic boom. The present invention relates to a telescopic device for an energy supply cable for supplying pressure oil and electric power to a boom tip working device of the device.

[0002]

2. Description of the Related Art As a telescopic device for a cable or the like of a conventional multi-stage telescopic boom device, Japanese Utility Model Laid-Open No. 61-163288 discloses a technique in which an oil feeding device is attached to the side surface of a 5-stage simultaneous telescopic boom.

However, the technique disclosed in the above publication is limited to an oil feeding device for a 5-stage simultaneous telescopic boom. Therefore, there is a drawback that it cannot be applied to a multi-stage telescopic boom having various telescopic systems, for example, a five-stage telescopic boom in which a commonly used base end side boom expands and contracts sequentially and a tip side boom expands and contracts simultaneously.

[0004]

SUMMARY OF THE INVENTION According to the present invention, there is provided a multi-stage telescopic boom in which a tip boom is telescopically extended at the same time as a base side boom adjacent to the tip boom, for example, a base side second stage boom and a third stage boom. Easily attached to the side of the boom of a vehicle crane (on-board crane, mobile crane) that has a multi-stage telescopic boom of various telescopic systems that can be telescopically or simultaneously expanded and contracted.
An object of the present invention is to provide a cable expansion / contraction device capable of expanding / contracting an energy supply cable in conjunction with boom expansion / contraction operation.

[0005]

Therefore, according to the present invention, the multistage telescopic boom device is suspended and supported by each of a plurality of telescopically mounted booms 11, 12, 13, 14, and 15. In addition, a plurality of cases 21 and 2 that are telescopically fitted
2, 23, 24, 25 are provided with a second-stage case 22 fitted to the base case 21 and provided with a slit 26 through which the cable 20 can reciprocate, and one end of the cable 20 is provided at the tip of the base case 21. And the other end is connected to the cable connector 28 provided at the rear end of the third stage case 23.

Further, according to the present invention, the tip boom 15 is attached to each of the plurality of booms 11, 12, 13, 14, 15 of the multi-stage telescopic boom device which is telescopically extended at the same time as the base boom 14 adjacent thereto. In a cable expansion and contraction device including a plurality of cases 21, 22, 23, 24, 25 which are suspended and supported so as to extend and contract, a slit 46 is provided in the tip case 25, and a base adjacent to the tip case 25 is provided. Pulley 36 is attached to the tip of the end case 24.
This pulley 36 is provided inside the tip case through the slit 46 provided in the tip case 25 so as to be capable of reciprocating in the longitudinal direction of the case, and the cable 29 guided from the tip part of the tip case 25 is provided. After being folded back at the rear end of the front case 25, it is hooked around the pulley 36 and then moved to the next base case 23.
It is characterized in that it is connected to a cable connector provided at the rear end of the.

Further, according to the present invention, the second stage on the base end side,
The 3rd and 4th booms 12, 13, 14 expand and contract in sequence, and the 5th boom 15 which is the tip boom is the 4th boom 14
5 telescopic boom device that expands and contracts at the same time as the telescopic expansion or contraction, or the cable expansion and contraction device of the 5 step telescopic boom device that expands and contracts all booms at the same time. A plurality of cases 21, 22, 23, 24, 25, which are suspended and supported by each of 13, 13, 14, and 15 and are elastically fitted, are arranged along the outside of the base case 21. The cable 18 is connected to the cable connector 19 attached to the tip of the base case 21, and the cable 20 whose one end is connected to the cable connector 19 has the slit 26 formed at the base end of the second-stage case 22. The tip cable 29, which is connected to a cable connector 28 provided at the rear end of the third-stage case 23 and one end of which is connected to the cable connector 28, passes through the third-stage case 23 and the fourth-stage case 24, and then the tip case 25. Of the 4th stage case 24 Attached to the end portion, the front-end case 25 through the slit 46 of the front-end case 25
A guide piece provided at the proximal end of the tip case 25 after the tip cable 29 is hung around the fury 36 located inside.
It is characterized in that it is led out to the outside of the case from the front end of the front case 25 via 37.

[0008]

According to the present invention, the tip boom 15 is the fourth stage boom.
It expands and contracts at the same time as 14, and the fourth boom 1 other than the tip boom 15
4, the 3rd boom 13 and the 2nd boom 12 are extended or retracted at the same time or in sequence, and each case 22, 23, 24, 25 of the cable extender is linked to the boom extend of the multistage extender boom device. Since the slit 26 is provided in the second-stage case 22, the cable 20 is not damaged when the second-stage case 22 is stored in the base-end case 21, and the cable 20 is not damaged near the rear-end surface of the base-end case 21. It can be fitted deeply, so that the expansion and contraction stroke of the case 22 can be lengthened.

[0009]

1 to 13 show a second stage boom 12, a third stage boom 13 and a fourth stage boom 14, which are telescopically fitted to a base end boom 11, extend and retract in sequence, and a tip boom 15 has a fourth stage boom. 1 shows an embodiment of a cable telescopic device B-1 according to the present invention applied to a 5-step telescopic boom device A-1 (see FIGS. 1, 2 and 3) that expands and contracts simultaneously with the eye boom 14.

As shown in FIG. 1 and FIG. 2, the cable expansion / contraction device B-1 has five cases fitted in such a manner that it can be expanded and contracted sequentially, that is, a tip case 21, a second case 22, and a third case. 23, 4th stage case 24 and tip case 25,
These cases are the booms of the 5-stage telescopic boom device A-1.
It is configured to be hung on the side surfaces of 11, 12, 13, 14 and 15, respectively, and the cable telescopic device is telescopically operated in conjunction with the telescopic operation of the telescopic boom device.

Therefore, the cases 21, 22, 23, 24 and 25 of the cable expansion / contraction device B-1 which are sequentially and elastically fitted.
Brackets 31, 32, 33, 34 and
35 protruding from each and pin holes 4 of these brackets
Insert support pins 51, 52, 53, 54 and 55 planted on the sides of booms 11, 12, 13, 14 and 15 of 5-step telescopic boom A-1 into 1, 42, 43, 44 and 45, respectively. By doing so, the sequential cases of the cable telescopic device B-1 are suspended and supported on the side surfaces of the sequential booms of the telescopic boom A-1.

In the illustrated 5-step telescopic boom device A-1, since the base end side booms 12 and 13 are sequentially extended, the base end boom 11 and the second step boom 12 in the retracted state shown in FIG.
The cylinder device 6 provided between and is extended first, whereby the boom 12 is extended. At this time, the booms 13, 14 and 15 are extended to the boom tip side as they are due to the positional relationship during storage. It is configured to move.

When the extension of the boom 12 is completed, the cylinder device 7 provided between the booms 12 and 13 is extended, and the boom 13 is extended.
4, 15 are moved to the boom tip side as they are due to the positional relationship when stored.

Finally, the cylinder device 8 provided between the booms 13 and 14 is extended, so that the boom 14 is extended.

At the same time as the extension of the tip side boom 14, the tip boom is extended.
In order to extend 15, the boom simultaneous extension wire rope 9 is provided so as to be connected to the rear end of the tip boom 15 from the tip of the boom 13 through the pulley 10 provided at the tip of the boom 14. As the boom is extended, the tip boom 15 is simultaneously extended by the boom simultaneous extension wire rope 9.

The retracting operation of the telescopic boom device A-1 is configured such that, contrary to the extension order, the tip side booms 14 and 15 are simultaneously contracted, and then the base side booms 13 and 12 are contracted in that order. . Therefore, the boom simultaneous reduction wire rope 16 is connected from the tip end portion of the tip boom 15 to the tip end side end of the cylinder of the cylinder device 7 via the pulley 17 provided at the base end side end of the cylinder of the cylinder device 8. By this, the tip boom 15 is reduced simultaneously with the reduction of the boom 14 due to the reduction of the cylinder device 8, and then the cylinder devices 7 and 6 are reduced in order.

As shown in FIGS. 4, 5 and 6, an energy supply cable 18 for supplying pressure oil and electric power is arranged along the outside of the base case 21 and is attached to the tip of the base case 21. The cable connector 19 is connected to the cable 20 in the proximal case 21. This cable 20 is connected to a cable connector 28 provided at the rear end of the case 23 by a curved guide tube 27 through an interference prevention slit 26 formed at the base end of the case 22, and one end is connected to this cable connector 28. Cable 29 is routed inside the cases 23, 24 and 25 and hung around a pulley 36 on a support bracket 30 attached to the case 24, and the tip case
After being guided to the guide piece 37 at the rear end of the front end 25 and fixed to the front end by the fixing metal fitting 38 at the front end of the front end case 25, it is taken out from the case through the opening 39 formed at the front end of the case, and the front boom 5 It is led out to the work box 40 at an aerial position.

As shown in FIGS. 5 and 6, the pulley supporting bracket 30 passes through the slit 46 formed in the tip case 25 so that it does not interfere with the expansion and contraction operation of the case.
25, so that the pulley 36 is rotatably supported by the support shaft 47 on the upper end of the support bracket 30 in the tip case.

When the telescopic boom device A-1 is extended,
As the boom 12 extends, the case 22 suspended and supported by the support pins 52 on the side surface of the boom 12 also extends, and when the case 22 extends, the tips of the cases 23, 24, and 25 are stored in the case 22. The curved cable 20 whose one end is connected to the cable connector 28 is also moved to the front side and is pulled out to the front side while moving to the front side (see FIG. 9).

Next, when the boom 13 is extended, this boom
As the extension operation of 13 is performed, the case 23 suspended and supported by the boom 13 by the support pin 53 is also extended, and the cases 24 and 25 are moved to the tip side together with the case 23 while being stored in the case 23. As a result, the bending cable 20 connected to the cable connector 28 also moves to the tip side and is pulled out to the tip side.

Finally, when the booms 14 and 15 are simultaneously extended as described above, the cases 24 and 25 suspended and supported on the sides of the booms 14 and 15 by the support pins 54 and 55 as the booms 14 and 15 are extended. Also grows at the same time. At this time, the pulley 36 located at the tip of the case 24 is rotated counterclockwise by the cable 29, and the cable 29 is moved to the proximal end side.
While sending out, without sagging the cable 29,
The cases 24 and 25 are extended, and when the booms 14 and 15 are completely extended, the extension operation of the cable retractor is also completed (see FIG. 4).

The retracting operation of the cable retracting device B-1 when the retractable boom device A-1 is contracting is performed in the reverse order of the above-described extending operation from the tip end side.

The cable expansion / contraction device according to the present invention can be applied to the case where the boom at the base end side of the multi-stage expansion / contraction boom device sequentially performs expansion / contraction operations other than the expansion / contraction operation by using the boom expansion / contraction force as a driving force.

For example, when the second stage boom on the base end side of the multi-stage telescopic boom device does not operate sequentially due to inconvenience during extension, as shown in FIG. Step case 23 is extended and the case
24 and 25 are moved to the tip side while being stored in the case 23. In this case, the second-stage case 22 remains stored in the base-end case 21, but since the slit 26 is provided in the lower surface of the second-stage case 22, the cable 27 is attached to the lower surface of the second-stage case 22. The third-stage case 23 can be expanded and contracted without being interfered with by, and the cable 27 is not damaged.

Further, since the slit 26 is provided on the lower surface of the second-stage case 22, the case 22 is fitted deeply into the vicinity of the rear end surface of the base case 21 without the cable 20 interfering with the rear end of the case 22. Therefore, the expansion and contraction stroke of the case 22 can be lengthened.

10 and 11 show that the support shaft 47 of the pulley 36 of the cable expansion / contraction device is attached to the inner wall of the case 24.
An embodiment in which 36 is cantilevered is shown. In this embodiment, a slit 48 is provided by cutting out the side surface of the case 25.

FIG. 12 shows an embodiment in which the pulley 36 is supported by a support rod 49 extending from the base end of the case 24.

FIG. 13 shows a 5-step telescopic boom device in which all booms are simultaneously telescopic. As shown in the figure, this five-stage telescopic boom device has a telescopic operation cylinder device 6 connected between a base end boom 11 and a second-stage boom 12, and when the cylinder device 6 extends, the second-stage boom 12 The booms of the third to fifth booms 13, 14 and 15 are extended at the same time as the extension of the booms.
Boom 1 on the base end side is further passed through pulleys 10 provided on the base end sides of the base end booms 12, 13, 14 by extension wire ropes 9 on the base end sides of 13, 14, 15 respectively.
It is connected to the tip side ends of 1, 12, and 13, respectively. Also,
At the same time as the second boom 12 is reduced, the third to fifth booms 1
These booms 13, 1 so that 3, 14, 15 shrink at the same time
The proximal ends of 4 and 15 are passed through pulleys 17 provided on the proximal ends of the proximal booms 12, 13 and 14 by reduction wire ropes 16, respectively, and further to the booms 11 and 12 at the proximal end.
It is connected to the tip end of 13 respectively.

14, 15, 16, 17 and 18 show an embodiment of the cable telescopic device B-2 according to the present invention, which is applied to the four-stage telescopic boom device A-2.

A four-stage telescopic boom device A- shown in this embodiment
2 and the structure and operation of the cable expansion / contraction device B-2 are the same as those in the embodiment implemented in the above-described five-stage expansion / contraction boom device A-1 except that the proximal end side boom 12 and the proximal end side case 22 are omitted. The parts are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0031]

According to the present invention, the three-stage, four-stage, and five-stage multi-stage telescopic boom device and the five-stage simultaneous telescopic system in which the tip boom is telescopically extended at the same time as the boom on the direct base end side adjacent to the tip boom is extended. It is possible to provide a cable expansion / contraction device that can be applied to a boom and can be easily attached to and removed from the side surface of an expansion / contraction boom of a vehicle crane.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a cable retractor according to the present invention attached to a boom side surface of a 5-stage retractable boom device in an extended state.

FIG. 2 is a schematic plan view of FIG.

FIG. 3 is an enlarged vertical sectional view of the 5-stage telescopic boom device shown in FIG. 1 in a reduced state.

4 is a vertical sectional view of the cable expansion / contraction device shown in FIG. 1. FIG.

5 is a longitudinal sectional view of the cable expansion / contraction device shown in FIG. 4 in a reduced state.

6 is a cross-sectional view taken along the line VI-VI of FIG.

7 is a cross-sectional view taken along line VII-VII of FIG.

FIG. 8 is an explanatory view showing the distal end case of the cable expansion / contraction device shown in FIG. 5 in an extended state.

9 is an explanatory view showing a state in which the second-stage case is extended from the base end case in the cable expansion / contraction device shown in FIG.

FIG. 10 is a partial cross-sectional view showing a modified example of the support structure of the cable supporting pulley of the cable expansion / contraction device.

11 is a cross-sectional view taken along line XX of FIG.

FIG. 12 is a partial cross-sectional view showing another modified example of the support structure for the inner pulley of the cable expansion / contraction device.

FIG. 13 is a vertical cross-sectional view of a 5-stage telescopic boom device of the simultaneous telescopic system.

FIG. 14 is a side view showing the cable expansion / contraction device attached to the side surface of the boom of the four-stage expansion / contraction boom device.

15 is a sectional view taken along line XV-XV in FIG.

16 is a longitudinal sectional view of the cable expansion / contraction device shown in FIG. 14 in an expanded state.

17 is a vertical cross-sectional view of the cable expansion / contraction device shown in FIG. 14 in a reduced state.

18 is a longitudinal sectional view of the telescopic boom device shown in FIG. 14 in a reduced state.

[Explanation of Codes] A-1 5-step telescopic boom device B-1 Cable telescopic device 11 Base boom 12 2nd stage boom 13 3rd stage boom 14 4th stage boom 15 Tip boom 21 Base case 22 2nd stage case 23 Third stage case 24 Fourth stage case 25 Tip case 31, 32, 33, 34, 35 Bracket 41, 42, 43, 44, 45 Pin hole 51, 52, 53, 54, 55 Support pin 6, 7, 8 Cylinder device 9 Wire rope for simultaneous boom extension 10 Pulley 16 Wire rope for simultaneous boom reduction 17 Pulley 18 Energy supply cable 19 Cable connector 20 Cable 26 Slit 27 Guide tube 28 Cable connector 29 Tip cable 30 Support bracket 36 Pulley 37 Guide piece 38 Fixing bracket 39 Opening 40 High work box 46 Slit 47 Support shaft 48 Slit 49 Support rod

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B66F 9/06 L 7515-3F

Claims (3)

[Claims] 1. A plurality of telescopically mounted booms (11, 12, 13, 14, 15) suspended from and supported by each of a plurality of telescopically mounted booms (11, 12, 13, 14, 15). Case (21, 22, 23, 24, 25), base case (21)
A cable connector in which a slit (26) through which the cable (20) can reciprocate is provided in a second-stage case (22) fitted in the cable, and one end of the cable (20) is provided at the tip of the base case (21).
(19), and the other end is connected to a cable connector (28) provided at the rear end of the third stage case (23). 2. A plurality of booms (11, 12, 13, 14, 15) of a multi-stage telescopic boom device in which a tip boom (15) is telescopically extended at the same time as a base boom (14) adjacent thereto. A plurality of cases that are suspended and stretchably fitted
(21, 22, 23, 24, 25) In a cable expansion and contraction device equipped with a slit (46) in the tip case (25),
At the tip of the proximal case (24) adjacent to (25), attach the pulley (3
6) is provided, and the pulley (36) is provided inside the tip case through the slit (46) provided in the tip case (25) so as to be reciprocally movable in the length direction of the tip case (25). The cable (29) guided from the tip end part of the is folded back at the rear end of the end case (25) and then hung around the pulley (36) to be installed at the rear end of the next base side case (23). A cable telescopic device for a multi-stage telescopic boom device, characterized in that it is connected to a cable connector. 3. The booms (12, 13, 14) of the second, third, and fourth stages on the proximal end side are sequentially expanded and contracted, and the fifth boom (15), which is the tip boom, is the fourth stage. A five-step telescopic boom device that expands and contracts at the same time as the boom (14) expands and contracts, or a cable telescopic device of the five-step telescopic boom device that expands and contracts all booms at the same time. A plurality of cases (2, 11) which are suspended and supported by each of the booms (11, 12, 13, 14, 15) and are telescopically fitted.
1, 22, 23, 24, 25) and the cable (18) arranged along the outside of the base case (21) is attached to the tip of the base case (21) (19) Cable (20) connected to this cable connector (19) at one end
The slit (26) formed at the base end of the second case (22)
Is connected to the cable connector (28) provided at the rear end of the third stage case (23), and the tip cable (29) whose one end is connected to the cable connector (28) is the third stage case (23). And the tip case (2) through the fourth case (24) and into the tip case (25) and attached to the tip of the fourth case (24).
It was provided at the proximal end of the tip case (25) after the tip cable (29) was wound around the pulley (36) located in the tip case (25) through the slit (46) of 5). A cable expansion / contraction device for a 5-stage telescopic boom device, characterized in that it is led out to the outside of the case from the front end of the front case (25) via a guide piece (37).