JPS59108692A - Expansion device for lattice type boom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention is capable of expanding and contracting in the horizontal direction by slidably fitting together three or more booms of different sizes that are assembled into a rectangular tube shape and a lattice shape using beams. This invention relates to a lattice-type boom extension and retraction device that is combined with a lattice type boom.

BACKGROUND OF THE INVENTION When constructing a medium to high-rise building, a construction crane as shown in FIG. 1 has conventionally been used.

This crane has a mast 2 erected on a base 1 installed on the ground near a building a, a guide frame 3 attached to the mast 2, and a luffing boom 5, a winch, etc. attached to the guide frame 3. A revolving body 4 having the following structure is installed. When using such a lane to transport equipment into and out of a building after the steel frame has been assembled, as shown in Figure 1, the equipment must pass through the top of the building, so rain, snow, etc. During bad weather, the scaffolding becomes slippery and dangerous, so cargo handling operations have no choice but to be halted. Further, the revolving structure 4 is always located at the top of the mast 2, and the length of the rope between the suspended load on the ground and the boom point is several tens of meters, and in strong winds the rope is blown by the wind, making cargo handling operations impossible. For these reasons, there is a drawback that the operating rate of the crane is poor.

Furthermore, when using conventional cranes, equipment is brought in and taken out through the upper opening of the building, so the building must be built by raising the building from the first floor to the upper floors. Unfortunately, for floors below floors with covered floors, equipment must be transported by elevators attached to the building, and the distance between the elevator and the equipment installation location is long, This places a heavy burden on the workers who carry it. Therefore, as shown in Figure 2, the floor surfaces of each floor, b2...
・Openings that communicate in the vertical direction CI+ C2+ C3
... is installed and equipment is raised and lowered through this opening, but when lowering the suspended load d, the worker has to pull the rope together, making the work dangerous. increases. Also, at the end, the opening CI+e2+
Construction work has to be carried out to close C3..., causing further delays in the construction period.

In order to solve these drawbacks, the present inventor has developed a crane in which a lattice-type boom that is horizontally extendable and retractable is provided on a revolving body that is rotatably attached to a mast.

An object of the present invention is to provide a lattice-type boom extension/retraction device used in such a lane, which has a structure that allows continuous and easy extension/retraction operations.

In order to achieve this objective, the lattice type boom telescoping device of the present invention is capable of sliding a plurality of booms of different sizes, which are assembled in a rectangular tube shape and a lattice shape by a beam, relative to each other. A crane is equipped with a boom extension winch, and when one of the boom extension rope and boom retraction rope is wound onto the drum, the other is attached to the winding winch. The drum side of the boom extension rope is hung on the guide sheave attached to the rear of the boom other than the last stage boom, and the drum side of the rope is wrapped around the guide sheave attached to the front of the boom. The end of the rope is hooked to the sheave, and the end of the rope is connected to the rear of the last stage boom, and the rope is turned in a zigzag manner, while the boom retracting rope is connected to the rear of the first stage boom. The drum side of the rope is hung on the guide sheave attached to the attached guide sheave, and the drum side of the rope is hooked on the guide sheave attached to the front of the intermediate booms other than the first and last stage booms, and the drum side of the rope is hooked on the guide sheave attached to the rear of the boom. It is characterized in that the terminal end of the rope is hung, and the terminal end of the rope is connected to the front part of the final stage boom, so that the rope can be hung in a zigzag pattern.

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

In explaining the lattice type boom telescoping device according to the present invention, an outline of a crane that has already been developed by the present inventor will first be explained with reference to FIGS. 3 and 4. This crane is erected near a building with its legs 6a fixed 1-,
A mast 6 in which pieces of unit length are added and tied together according to the height of the building, and a slide frame 7 mounted so as to be movable up and down via a guide roller 60 so as to surround the mast 6. A slide frame lifting device including a lifting winch 8 installed on the slide frame 7, and a slide frame 7-L.
A revolving body 10 attached to the revolving body 10 via a revolving wheel 9, a plurality of (four in this embodiment) booms 1 attached to the revolving body 10, and a to lld extending and contracting in the horizontal force direction. It consists of a telescoping boom 11 that can be combined together, and a fastener 12 attached to the tip of the telescoping boom 11, that is, the tip of the tip boom 1], d.

As shown in FIG. 4, the mounting structure of the swing ring 9 installed at one end of the slide frame 7 is as shown in FIG. An inner ring 9b is mounted on an outer ring 9a, fixed by bolts 18 and nuts 19, and rotatably supported inside the outer ring 9a.
The lower frame 10a of the revolving body 10 is placed on top and a circular hole is made with bolts 20 and nano) 2]. Lower frame on rotating body 10! ,,Oa is also provided with circular holes 22 and 23], Ob is also provided with circular holes 22 and 23, and the mast 6 is inserted into each circular hole 2.
2 and 23 are penetrated in a non-contact state. A portion of the lower frame 1.0a of the rotating body Go0 extends outward1.
7, a motor mounting flange 10c is formed and a turning motor 24 with a speed reducer is mounted on the shifter, and a binion 25 that meshes with the external gear integral with the outer ring 9a is attached to the output shaft of the motor 24. The rotating body 10 rotates around the mast 6 by rotation. The elevating mechanism for the rotating body 10 and the slide frame 7 is constructed as follows. At the bottom of the slide frame 7 is a circular stand 28.
A winch 8 is installed on the stand 28. A rectangular frame 34 with sheave blocks 32, 33 attached on the left and right or front and rear sides is removably attached to the top of the mast 6 with pins 35.

On the other hand, each sheave block 32 and 33 of the slide frame 7
Corresponding sheave blocks 36 and 37 are attached to the same surfaces as those, and one rope 38 of the two lifting ropes 38 and 39 that are wound and let out by the lifting winch 8. In other words, the rope that is hung from the winch 8 to the sheave block 32 on the same side is attached to the slide frame 7 so that the part on the way from the winch 8 to the sheave block 32 does not come into contact with the mast 6, the slide frame 7, and the revolving structure 10. A guide roller 40 is installed to guide the rope 38, and is inserted between the sheave blocks 32 and 36 into the gap between the slide frame 7 and the rotating body 10 and the mast 6 without contacting it. The end is connected to the slide frame 7. The other rope 39 is hung by four guide sheaves 41 to 44 installed on the slide frame 7 so as to surround the mast 6 in a non-contact manner, and also in a non-contact manner with the slide frame 7 and the revolving structure 10. passed around,
The sheave blocks 33 and 37 are inserted into the gap between the slide frame 7 and the rotating body 1.0 and the mast 6 in a non-contact state 2, and the ends are connected to the slide frame 7. be. 160 is a guide roller for sliding the slide frame 7.

Next, the telescopic boom 11, which is the main part of the present invention, will be explained.
The telescopic boom 11 is attached to the revolving structure 1o, and includes three or more lattice booms lla to lid.
It is composed of a combination of In other words, these booms 1.1a to 1]d are made of metal beams combined in a rectangular tube shape and a lattice shape, as shown in FIGS. Inside the four corners of the boom ], ], a to third stage boom LLC, there are stoppers 49 at the front end of each boom and for the second to fourth stage zooms.
a~4.9c % In the vicinity of the stoppers 50a to 50c for preventing removal of the first and third stage booms, there are guide devices 5], 52 for vertical guides, and guide devices for left and right guides. 53, 53', and 54.54' are provided. As shown in FIGS. 7 and 8, the guide devices 51 and 52 for the upper and lower guides are rectangular plates 55.
A pin 59 is attached between the plate material 57 installed between the plates 56 and the main beams 58 at the four corners, a bracket 60 is rotatably attached to the pin 59, and a guide with a smooth surface made of hard synthetic resin or the like is attached to the bracket 60. The member 61 is attached so that the guide member 61 is in contact with the upper main beam 58 or the lower main beam 58 of the inner boom, and the bracket 60 moves the pin 59 according to the elastic deformation accompanying the work of the inner boom. By swinging around the center, the main beam 58 of the inner boom is always in contact with the entire surface of the guide member 61 to ensure smooth sliding movement. Similarly, the guide devices 53.53' and 54.54' for the left and right guides are made of plate material 55°56.
A pin 63 provided vertically between the plate material 62 and the main beam 58 installed between them, a bracket 64 rotatably attached around the pin 63, and the bracket 64
The bracket 64 swings following the left and right deformation of the main beam 58 of the inner boom, thereby smoothing the sliding movement of the boom. Of the left and right guide devices, the guide devices 53 and 54 on the side where guide sheaves 73 to 77 and 81 to 84, which will be described later, are provided protrude more inward than the other guide devices 53' and 54' to form a guide sheave installation space. It has a structure that allows

Next, the telescoping device for the telescoping boom 11 will be explained.

As shown in FIG. 3, on the first stage boom 11a, a boom extension winch 67 and a hoisting winch 68 are installed. The contracting rope 70 is wound around the drum of the winch 67 so as to be unwound, and when one rope 69 (70) is wound up, the other rope 70 (69) is unwound by the same length. It is now possible to The boom extension lobe 69 is connected to the first stage boom 1
1a, then as shown in FIGS. 5 and 6, the guide sheave 73 inside the front part of the first stage boom 11a, and the guide at the rear of the first stage boom 11a. The sheave 74, the guide sheave 75 on the inside front of the second stage boom llb, the guide sheave 76 on the rear part of the third stage boom 11'c, the guide sheave 77 on the inside front of the first stage boom 11a, and the fourth stage A termination is connected (78) to the rear of the boom lid. The boom retraction lobe 70 is
Guide sheave 79°80 at the rear of the first stage boom 11a (
3), and then as shown in FIGS. 5 and 6, the guide sheave 81 at the front outer side of the second stage boom 11'b, and the guide sheave 8 at the rear of the second stage boom llb.
2. Guide sheave 83 on the front outer side of the third stage boom LLC
, is hung on a guide sheave 84 at the rear of the third stage boom 11C, and its rear end is connected (85) to the front part of the fourth stage boom lid.

These ropes 69.70 are each used in pairs,
The guide sheaves on which these ropes are hung can also be relatively rotated, and by using them as a set, the difference in tension between the two ropes can be increased, and the rope We are trying to make the diameter smaller.

By the way, in the case of the above-mentioned horizontal telescopic boom, if the boom extension rope 69 is wound up by driving the winch 67, the boom will be extended, and the boom retraction rope 7 will be extended.
If the boom is retracted, the boom will retract. However, in order to reduce the weight by reducing the driving force of the winch 67, it is desirable to reduce the sliding resistance when the boom extends and retracts. In order to reduce the sliding resistance, it is desirable to extend from the larger (outer) boom when extending, and to contract from the smaller (inner) boom when retracted. At the time of contraction, normally it naturally contracts sequentially from the tip side (inner side) 11d where the reaction force is smaller. On the other hand, if the order is not restricted during extension, the boom will first extend from the inner boom lid, and as the amount of cantilever increases, the sliding resistance for extension will rapidly increase.Therefore, a device for regulating the order of extension may be provided. . An example of this order regulating device will be explained with reference to FIGS. 9 to 13. As shown in FIGS. 9 and 10, an order regulating device 12
0 and 120' are provided between each zoom stage, and each main beam 58 at one corner of each stage boom lla~] and 1d is respectively denoted as a, b, C, and d, and each order regulating device is 120,
120' is the main beam b, C as shown in FIG.
Roller mounting bodies 122 and 122' are rotatably mounted on the upper surface by pins 121 and 121', and two roller mounting bodies 122 and 122' are mounted at an angle in the direction of rotation. Rollers 123, 124 and 123'
, 124' and the boom 1 with the respective roller handle bodies attached thereto.
'L b , 11-C, each inwardly adjacent boom 1.1. The rollers 124 and 1 are provided at or near the rear ends of the main beams c and d of the main beams c and 11 d, respectively.
24', 25, 125', and a boom adjacent to the outside of each of which the roller mounting bodies 1, 22, 122' are attached. 11a+11c along the longitudinal direction,
The other rollers 1.23 and 1.23' are brought into contact with each other, and the one roller 124 and 1.24' is inserted into the notch 125.
, 1.25' and release the engagement when the rollers 123, 123' reach the recesses 126a, 126a' to release the engagement. Be prepared.

In addition, these order regulating devices control the roller 12 when the outer boom is pushed in due to boom extension state (i.e. vibration, etc.).
4 dimensions or 124' is the concave part 1-'26 a i tab 12
62' and the rollers 1241 and 124' come into contact with the linear guide surfaces], 26b, and 126b', so that the inner boom 11c, ], 1.
d or rollers 123, 123' or the boom on the row side] 1b, 11. In order to prevent contraction from c4R11, means for regulating the order of contraction is also provided. That is, near the rear ends of each of the main beams b and c, there are mounting blocks 127 and 1 fixedly installed on the -4-plane thereof.
．． 27' is fixed [7, the mounting block 127, 1.2
Rods 128, 128' are attached to 7' so that one end protrudes from the rear end of each main beam b, c, and stoppers 129, 129' are movably fitted to the rods 17, 129, 129'. ' is provided with abutting pieces 129a, ], 29a' that abut on each inner beam c+d, and between the stoppers 129, 129' and the supports fixed to the rear ends of the rods are metal pieces 130, 130'. Push springs 131, 13
1' is wound around a rod and interposed therebetween.

To explain the operation of this order regulating device, when the winch 67 is driven in the extending direction without being folded, the rollers 123 and 123'
are the guide surfaces 126b, 12 (5b') of the guide plate 126.
The rollers 124, 124' are in contact with the notches 125, 1
．． 25' (see Figure 12),
With the second stage boom llb, first stage boom llc, and third stage boom lid integrated, the roller 123 is rolling in contact with the guide surface 126b of the guide plate 126 while the first stage boom ], protruding forward from a. This action causes the roller 124 to move into the recessed part of the guide plate ]26]2
When the roller 1 reaches the position 6a, as shown in FIG.
24 is pushed by the rear edge 125a of the notch 125, the roller 124 rotates counterclockwise, and the roller 124 rotates counterclockwise.
rotates clockwise, and the roller 12 rotates clockwise as shown in FIG.
4 and the roller attachment body 122 are retracted from the movement path of the main beam C. In this way, the roller 123 is in the recess 126a.
If the stopper 49a and the stopper 50a are brought into contact with each other at a position where they are in contact with each other, the extension of the second stage boom Ilb is stopped at that position. By driving the winch 67 one more time, the third stage boom 1.1c and the fourth stage boom lid are extended in a unified state by the order regulating device 120', and the roller 123' is extended as before. When the roller 124' reaches the position of the recess 126a' of the guide plate 126', the engagement between the roller 124' and the notch 125' is released, and then the third stage boom Ild is extended.

As mentioned above, the rollers 123, 123' are in the recess 126B,
When the main beam C2d reaches the position where it abuts the main beam 126a' and begins to extend relative to the main beams b and c, the abutment piece 129a1129a' abuts the rear end of each of the main beams c and d. The collars 129, 129 are push springs 131
, 1.31', and is interposed between the mounting blocks 127, 127' and the rollers 123, 123'.

On the other hand, if the winch 67 is driven in the opposite direction, the third stage boom Ild, which has the smallest sliding resistance, will start to retract. If for some reason the sliding resistance when only the fourth stage boom 11d retracts is greater than the sliding resistance when the third and fourth stage booms or the second and fourth stage booms retract together. Even if the stopper 129, 129' is
, 123' and the mounting blocks 127, 127', and these rollers 123, 123'
26a, 126a', the rollers 123, 123' are prevented from rolling from the recesses 126a, 126a' to the guide surfaces 126b, 126b',
4th stage boom 11 (only l retracts. 4th stage boom 1
When the rear end of idO reaches the position where it comes into contact with the contact piece 12'9a' of the stopper 129', the stopper 129' is pushed by the spring 1.
31', and release the restraint of 4-2123', and then move the stopper 13 at the front end of the fourth stage pool 11d.
2 (see FIG. 9) comes into contact with the front end of the first stage boom 11a and pushes the third stage boom 11c, whereby the roller 123' moves from the recess 126 a' to the guide surface 126 b.
As a result, the roller mounting body 122' rotates counterclockwise, and the roller 124' fits into the notch 125'.

Furthermore, by driving the winch 67 in the retraction direction, the third and fourth stage booms are retracted together, and now the third and fourth stage booms are retracted together.
The stopper 129 is retracted at the rear end of the main beam b of the stage boom, and the plate 56 at the front end of the third stage boom l1cO comes into contact with the front end of the second stage boom 11b in the same manner as described above. The fourth stage boom is pushed in as one, and finally returns to the state shown in FIG. 9. Of course, there are cases where the work is carried out while the object is in the middle of expansion or contraction.

Next, the synchronization of hoisting and boom extension and contraction will be explained. Third
As shown in the figure, the hoisting rope 90 wound around the hoisting win f68 is hooked onto the guide sheep 91.92 at the rear end of the first stage boom 11a, and then at the tip of the first stage boom 11a. Sheep 93, a guide sheave 95 at the tip of a jib 94 protruding from the tip in the lateral direction (towards the driver's cab 26), sheaves 96, 97 of hook blocks to be hung with the hanging tool 12, guide sheave 98 at the tip of the jib 94, The guide sheave 99 at the tip of the first-stage boom 11a and the guide sheaves 100, 101 at the rear end of the first-stage boom 11a are hooked, and the shaft is directly connected to the boom extension/retraction winch 67 and has a diameter twice as large as the drum of the winch 67. The boom retracting lobe 70 is wound around a drum 102 having a diameter of .

These winches 67, +58 and lifting winch 8
In this embodiment, electric motors are used as each of the drive motors and the swing motor 24. Electrical connections to these motors are made as shown in FIG. That is, a terminal box 103 and a cylindrical body 104 supporting the outer ring 9a are installed at the top of the slide frame 7, and the primary terminal of the terminal box 103 is connected to a cable 105 connected to a ground power source. , the secondary side terminal is connected to a conductive ring 106 provided on the inner periphery of the cylindrical body 104, and the conductive ring 10
6 contacts the brushes 108 attached to the outer periphery of the inner cylinder body 107 integrated with the inner ring 9b, and these brushes 108
Electric power is supplied to the motors of the winches 67 and 68 and the swing motor 24 through a cable 109 connected to the swing body side control panel (not shown).

Further, the secondary side terminal of the terminal box 103 is connected to the control panel 11 installed on the slide frame 7 via the power line 1゜9 and the operation line 110.
1, connected to the machine 113 of the control panel 111,
Further, the control panel 111 is connected to the output line of the tension detector 114 of the lifting rope 38, 39.

FIG. 14 shows the working situation using the crane of this embodiment. When lifting equipment such as reinforcing bars, concrete formwork, temporary scaffolding, etc. from the ground, the telescopic boom 11 is kept in the retracted state. The lifting tool 12 is driven by the winch 68 for
is lowered to the ground and the equipment is hung on the hoisting tool 12, and then the hoisting winch 68 is driven in the hoisting direction until the ω tool 12 is in the vicinity of the jib 94, and then the turning motor 24 is driven. Then, the telescopic boom 11 is directed toward the building a, and the boom extending/contracting winch 67 is driven in the direction in which the boom extending rope 69 is wound. The rope 69 is shown in FIGS.
As shown in the figure, since the guide sheaves 73-77 are hooked, the telescopic boom 11 is extended by the length of the rope 69 as the rope 69 is wound up, while the boom retraction rope 70 is rolled out by the same length. At this time, the hoisting rope 90 wound around the drum 102 having twice the diameter of the drum of the winch 67 also has two parts of the rope 70.
Although it is fed out at twice the speed, the lowering speed of the fi'+ tool 12 is half of the feeding speed of the hoisting rope 90, so
The height of the hanging tool 12 is kept constant regardless of the boom extension. By such boom extension operation, the suspended load d can be carried into the building through the opening e on the side of the building a.

On the other hand, if the boom telescoping winch 67 is driven in the direction of winding the boom retracting rope 70, the telescoping boom 11 will retract in the opposite direction, and the suspended load d will be moved outside the building while maintaining a constant height. , and is carried out.

As described above, since this crane is equipped with a telescopic boom 11 that can be extended and retracted in the horizontal direction, cargo handling operations can be carried out with the roof of the building installed, making it possible to carry out cargo handling work safely even in bad weather, and to avoid rope damage caused by strong winds. This eliminates the possibility of drafting, allowing work to be carried out even in strong winds, increasing work efficiency, and enabling cargo handling work deep within buildings, reducing the burden on workers. Part 01~
This also eliminates the need to close C3.

Therefore, in the lattice boom extension/retraction device of this embodiment, the boom extension rope 6 is attached to the drum of the boom extension winch 67.
9 and a boom contraction rope 70 are wound so that when one is wound, the other is unwound by the same length as the amount of winding, and the boom extension rope 69 is attached to the boom 1 other than the fourth stage boom lid. Guide sheave 7 at the rear of a~llc
The drum side of the six ropes is hung on the guide sheave 73 attached to the front part of the boom 11a to llc.
Hang the end of the rope 69 at 75.77, and connect the end of the rope 69 to the rear of the fourth stage boom lid (78)
By doing this, the rope is rotated in a zigzag manner, while the boom retracting rope 70 is hung on the guide sheave 80 attached to the rear part of the first stage boom 11a, and
Boom llb, llc other than 1a and 4th stage boom lid
The drum side of the rope 70 is hung on the guide sheaves 81 and 83 attached to the front part of the boom 11-
], ], d are connected to the front part (85), and the hooks are rotated in a zigzag manner. By continuously driving the boom telescoping winch 67, the second to fourth stage booms can be continuously moved. It is easier to operate than when a hydraulic cylinder is used as the drive device, in which each boom is extended and retracted intermittently, and it can be extended and retracted continuously. By making this possible, swinging of the suspended load can also be prevented. Furthermore, by providing the order regulating devices 120, 120' as in the above embodiment,
The maximum value of sliding resistance is reduced, smooth expansion and contraction is possible, and a small capacity and lightweight motor can be used as the drive motor for the boom expansion and contraction winch 67. Still, the gap on one side between each stage boom is made larger than the other side, and the boom extension lobes 69 are placed at different heights of the gap.
By passing the ropes 69 and 70 through each guide sheave, the size of the boom can be made smaller than when the ropes 69 and 70 are passed through each of the ropes 69 and 70 on both sides.

Note that the present invention is not only applicable to a crane having a mast, revolving body, or telescopic boom configured as shown in the above embodiments, but also to a crane having three lattice-type booms that are horizontally extendable and retractable. It can be applied to anything.

As described above, according to the present invention, in a structure in which three or more booms are telescopically combined with lattice type booms, the booms can be extended and retracted continuously, there is no interruption in the telescoping operation, and efficiency is improved. In addition, the swing of the suspended load is prevented, which improves work safety.Furthermore, each stage boom extends and contracts smoothly with continuous operation, resulting in good operability.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a conventional crane in a working state, FIG. 2 is a diagram showing another working situation by the conventional crane, and FIG. 3 is a perspective view showing an example of a crane to which the present invention is applied.
FIG. 4 is a longitudinal sectional view of the crane. 5 to 13 are views showing one embodiment of the present invention, FIG. 5 is a plan view showing the combination of booms and the arrangement structure of the boom extension/retraction rope, and FIG. 6 is the same as that shown in FIG. 7 is a sectional view showing a boom guide device, FIG. 8 is a sectional view taken along line B-B in FIG. 10 is a sectional view taken along the line CC in FIG. 9, FIG. 11 is a perspective view showing the order regulating device, FIGS. 12 and 13 are plan views explaining the operation of the order regulating device, and FIG. 14 is a It is a working status diagram of a crane using the boom. DESCRIPTION OF SYMBOLS 11... Telescopic boom, 11P-11d... Each stage boom, 67... Winch for boom extension and contraction, 69... Rope for boom extension, 70... Rope for rope contraction, 71-
77.80~84...Guide sheave, 120°120
'... Order regulating device, 122, 122'... Roller mounting body, 123, 123', 124, 124'... Roller, 125, 125'... Notch, 126, 126'
...Guide plate patent applicant Hitachi Construction Machinery Co., Ltd. Agent Patent attorney Tadashi Akimoto Actual agent Patent attorney Waka 1) Masaru - 1st ON 122'121' 58 (a) Heat (b) Figure 11 Figure 12

Claims (1)

[Claims] Three or more lattice-type booms of various sizes assembled in a rectangular tube shape and a lattice shape by one beam are slidably fitted to each other in a horizontal direction. A crane equipped with a telescoping boom that can be combined in a telescoping manner, equipped with a boom telescoping winch, and when one of the boom extension lobes and the boom retraction rope is wound around the drum, the other one has the same length as the winding amount. The drum side of the boom extension rope is hung on the guide sheave attached to the rear of the boom other than the last stage boom, and the rope is wrapped around the guide sheave attached to the front of the boom. and the end of the rope is connected to the rear part of the last stage boom, so that the rope can be hung in a zigzag manner, while the above-mentioned frame contraction rope is connected to the guide attached to the rear part of the first stage boom. The drum side of the rope is hung on the guide sheave attached to the front of the intermediate boom other than the first and final stage frames, and the drum side of the rope is hooked on the guide sheave attached to the rear of the boom. A lattice-type boom extension/retraction device characterized in that the terminal end of the rope is hung, and the terminal end of the rope is connected to the front part of the final stage boom, thereby rotating the rope in a zigzag manner. 2. Each guide sheave is arranged so that the gap on one side between each stage boom is larger than the other side, and the boom extension rope and boom retraction rope pass through the gap at different heights. A lattice-type boom telescoping device according to claim 1, characterized in that: 3. The lattice type boom extension/retraction device according to claim 1, further comprising an order regulating device provided between each of the boom stages to extend the booms from the outside first. 4. The order regulating device includes a roller mounting body which is rotatably attached to the booms other than the first stage and the last stage with a pin, and a roller mounting body which is attached at an angle in the direction of the rotational force. two rollers mounted side by side, and provided at the rear of the boom adjacent to the inside of the boom where the rollers are mounted,
A roller engaging means for engaging one of the rollers, provided along the longitudinal direction on a boom adjacent to the outside of the boom attached to the roller mounting body, and bringing the other roller into contact with the boom, A roller guide means that engages with the engagement means over a predetermined range and releases the engagement when the boom to which the roller mounting body is attached extends to the maximum extension position. The lattice boom extension and retraction device according to item 3.