JPH07112911B2 - How to operate the jib connected to the telescopic boom - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating a jib which is added to a telescopic boom.

[0002]

2. Description of the Related Art Telescopic booms used in cranes such as hydraulic truck cranes and rough terrain cranes are connected to the tip of the telescopic boom when they are used, and when they are not in use, they are stored in one side of the telescopic boom in an inverted folding shape. The jib is attached.

This type of jib is a smaller work for the work of adding from the retracted position on one side of the telescopic boom to the end of the telescopic boom and the work of retracting to the one side of the telescopic boom from the additional position added to the end of the telescopic boom. Safe in space
It is hoped that this will be possible.

A conventional example of this type of jib is shown in FIGS.
I will explain. In Japanese Patent Laid-Open No. 59-74894, FIG.
~ A jib as shown in Figure 7 is shown. That is, FIGS.
7, the jib 2 is a jib mounting frame 4, a jib mounting
The base end of the frame body 4 is rotated in the vertical direction via the horizontal support shaft 6.
Of the jib body that is mounted so that it can move, and the jib body 7.
Connect the upper proper place and the proper place of the jib mounting frame 4 to connect the jib
Releasable to fix body 7 in vertical rotation position (extended position)
It is configured with the coupling device 8.

The jib mounting frame 4 is a telescopic boom 1.
180 ° from the front position of the front of the tip of the
The base is designed so that it can be rotated laterally between the rotated inverted positions.
Rotation connecting device 3 from one side of the part to one end of the telescopic boom 1
It is detachably attached via. Also this jib
The mounting frame body 4 is provided on the other side of the base and the tip of the telescopic boom 1.
The jib in cooperation with the other side in cooperation with the rotary coupling device 3.
Releasable fixing for fixing the mounting frame 4 to the front position
A device 5 is provided.

When the jib 2 is extended and stored, the telescopic boom 1 is raised and the jib body 7 is freely suspended from the jib mounting frame 4 via the horizontal support shaft 6, and then the jib is suspended. The mounting frame body 4 is attached to the rotation connecting device 3
To the front position from the reverse position around the, or is rotated from the front position to the reverse position, as if to secure the extended position of the jib body 7 by a connecting device 8 thereon against the jib attachment frame 4 There is. In addition, place the jib mounting frame 4 in the front position.
When it is done, the frame for connecting the jib is fixed by the fixing device 5.
4 is fixed to the tip of the telescopic boom 1.

However, in this known example, when the jib 2 is extended and stored, the telescopic boom 1 is stored.
When the arm is raised, the rotation axis 3C of the rotation coupling device 3 that rotatably couples the jib attachment frame 4 to the tip end side of the telescopic boom 1 in the lateral direction inclines from the vertical direction. When the jib attachment frame 4 is rotated from the inverted position to the front position about the rotation connecting device 3 when the jib attachment frame 4 is extended and stored,
The jib body 7 in a freely suspended state (the position indicated by the chain double-dashed line in FIG. 6) on the jib mounting frame 4 via the horizontal support shaft 6.
There was a problem that the tip part of the sway greatly swings back and forth.

Because, the horizontal support shaft 6 that connects the jib mounting frame body 4 and the jib body 7 in a vertically rotatable manner maintains the levelness when the jib mounting frame body 4 is in the inverted position and the front surface position. However, the frame 4 for mounting the jib has the rotation connecting device 3
In a state in which the axis of the horizontal support shaft 6 is rotated approximately 90 ° from the inversion position or the front surface position about the center, the horizontal support shaft 6 is in a state substantially along the longitudinal direction of the telescopic boom 1 in the upright state. The tip portion of the jib body 7 rotatably attached to the body 6 largely moves forward. (Position B shown by a chain double-dashed line in FIG. 6). From this state, when the jib mounting frame 4 is rotated about the rotation coupling device 3 to the front position or the reversal position,
The horizontal support shaft 6 becomes horizontal, and the jib body 7 that is freely suspended on the horizontal support shaft 6 swings backward. Therefore, the jib body 7 swings greatly in the front-back direction.

Further, in order to make the jib mounting frame 4 turn 90 degrees from the inverted position or the front position about the turning coupling device 3, the jib body 7 is tilted forward from the vertically suspended state. There is a problem in that a large force is required because the center of gravity of the jib main body 7 is substantially lifted due to this inclination (the position B indicated by a chain double-dashed line in FIG. 6).

Another conventional example of this type of jib is shown in FIG.
And explain. In Japanese Patent Laid-Open No. 55-119693, FIG.
A jib as shown in is shown. That is, in FIG.
The jib 2 has a jib mounting frame 4 and a base end portion for mounting the jib.
The frame 4 is mounted so that it can be rotated in the vertical direction via a horizontal shaft 6.
Attached jib body 7 and jib body 7 and jib attachment
The jib body 7 is inserted between the frame body 4 and the horizontal shaft 6 and
It is composed of a hydraulic cylinder 9 which is driven to rotate in the center.
It

The jib mounting frame 4 is a telescopic boom 1
180 ° from the front position of the front of the tip of the
The base is designed so that it can be rotated laterally between the rotated inverted positions.
Rotation connecting device 3 from one side of the part to one end of the telescopic boom 1
It is detachably attached via. Also this jib
The mounting frame body 4 is provided on the other side of the base and the tip of the telescopic boom 1.
The jib in cooperation with the other side in cooperation with the rotary coupling device 3.
Releasable fixing for fixing the mounting frame 4 to the front position
A device 5 is provided.

The hydraulic cylinder 9 has the jib body 7
The position extended in the front direction of the mounting frame 4 (virtually shown in FIG. 8
Line) and downward bend position (shown in solid line in Figure 8).
It is forcibly rotated between the
By controlling the rotation, the jib body 7 can adjust its bending angle arbitrarily.
It is designed to be curbed. In addition, in front of the jib mounting frame 4
When the surface position is reached, the fixing device 5 fixes the jib connection.
Fix the binding frame 4 to the tip of the telescopic boom 1.
ing.

By the way, the known example shown in FIG.
The jib 2 from the folded position to the extended position.
Or change the posture from the overhang position to the folding position
In this case, the hydraulic cylinder 9 is used to attach the jib body 7 to the jib.
Remove the jib with the frame 4 extended to the front.
The attachment frame 4 is centered on the rotation axis 3C of the rotation coupling device 3.
In addition, it is adapted to rotate by an appropriate means. In this case,
The rotation of the mounting frame 4 around the rotation axis 3C is
Adjust the telescopic boom 1 up and down so that it can be achieved with a small force.
So that the rotation axis 3C of the rotation coupling device 3 is substantially vertical.
I am trying to do it.

Therefore, the jib 2 is connected from the folded position.
To the additional position or from the additional position to the folding position
When changing the posture, the tip of the jib body 7 moves in an arcuate path.
The problem that drawing requires a large work space
was there.

By the way, the jib shown in FIG. 8 is a jib body.
7 is the downward bending position (the position shown by the solid line in FIG. 8)
In this state, the jib mounting frame body 4 is attached to the rotation connecting device 3
Of the telescopic boom 1 by rotating around the rotation axis 3C of the
It may be possible to rotate it to the rest or inversion position.
However, even if this is done, the jib body 7 is bent downward.
The bending position is such that the longitudinal direction of the jib body 7 is aligned with the rotation axis 3C.
In contrast, it is set to have an inclination of about 20 ° .
Therefore, the jib 2 is in the extended position from the folded position.
Or change the posture from the overhang position to the folding position.
It is said that the trajectory of the tip of the jib body 2 is still large when
I have a problem. Further, in this case, the jib body 7 is bent downward.
Expansion and contraction so that it can be moved to the bending position (the position shown by the solid line in Fig. 8).
The arm 1 must be raised and, as a result, the pivot axis 3
C is inclined from the vertical. Therefore, the jib body 7
Rotate the jib mounting frame 4 in the downward bending position
When the connecting device 3 is rotated around the center, the inclination of about 20 ° is provided.
The center of gravity of the jib body moves up and down greatly depending on the inclination
As a result, centering around the rotation axis 3C of the jib mounting frame 4.
There is a problem that a large force is required for the turning.

Therefore, in the jib shown in FIG.
The jib body 7 is bent downward while leaving the problem described above.
Install the jib in the position (the position shown by the solid line in Fig. 8)
Rotate the frame 4 around the rotation axis 3C of the rotation coupling device 3.
Attempting to overhang or store the jib 2 by
The idea is not easy to reach.

[0017]

As described above, FIG.
A jib connected to the telescopic boom shown in FIG.
9-74894), the protrusion of jib 2
When swinging or storing, the jib body 7 swings back and forth.
Not only is it large and dangerous, but also allows this swinging
I needed a big space. Also, its operation is large
I needed a lot of power. In addition, the telescopic boom shown in FIG.
Jib (Japanese Patent Application Laid-Open No. 55-119693)
In the case of overhanging or storing the jib 2
The jib body 7 does not swing, so it can be safely extended.
Alternatively, although it can be stored, the jib body 7
Since the tip moves along a large arcuate trajectory,
I needed a working space to match it.

The present invention, this proposes the jib method operations spliced to a novel telescoping boom which overcomes the above drawbacks in the jib to be spliced to the telescopic boom of the prior art
That is, when the jib 2 is extended or stored, the jib is
The main body 7 does not swing and overhangs in a small work space
It is added to a telescopic boom that can be stored or stored.
It is intended to provide a method of operating a jib .

[0019]

In order to achieve the above object, a method of operating a jib to be added to a telescopic boom according to the present invention is as follows. The jib 2 which can be folded along the jib 2, and in particular, the front position of the front end portion of the telescopic boom 1 and the telescopic boom 1 from this front position.
For attaching a jib, one side of its base is detachably attached to one side of the distal end of the telescopic boom 1 through a pivotal coupling device 3 so that it can be pivoted between 180 degrees to the side. The jib attachment frame body 4 is fixed to the front position of the telescopic boom 1 in cooperation with the rotary connecting device 3 between the other side of the base portion of the frame body 4 and the other side of the distal end portion of the telescopic boom. A frame 4 for attaching a jib having a releasable fixing device 5, and a base end portion thereof attached to the frame 4 for attaching a jib so as to be vertically rotatable via a horizontal support shaft 6 It comprises a jib main body 7 and a hydraulic cylinder 9 which is interposed between the jib main body 7 and the jib mounting frame 4 and which drives the jib main body 7 to rotate about the horizontal support shaft 6. A method of operating a jib, wherein the jib main body 7 is a jib mounting frame by the hydraulic cylinder 9. 4 between the extension position of the jib body 7 and the downward bending position in which the longitudinal direction of the jib body 7 is substantially parallel to the rotation axis 3C of the rotation coupling device 3 of the jib mounting frame 4. When the posture of the jib 2 is changed from the folding position to the extending position or from the extending position to the folding position, the hydraulic cylinder 9 first moves the jib body 7 against the jib mounting frame 4.
The pivot is fixed to the lower bending position, then apply the jib mounting frame 4 about a pivot axis 3C of the pivotal connecting device 3
It is characterized in that the jib main body 7 is turned to the extension position with respect to the jib attachment frame body 4 by the hydraulic cylinder 9 and finally turned to the front position or the reversal position by a convenient means .

[0020]

According to the method of operating the jib added to the telescopic boom of the present invention, when the jib is extended and stored, the frame for attaching the jib can be pivoted to the tip of the telescopic boom via the pivotal coupling device. Raise the telescopic boom in the connected state, bend the jib body downward from the jib mounting frame via the horizontal support shaft, and then move the jib mounting frame from the inverted position to the front from the turning connecting device. Or to rotate from the front position to the inversion position, and then the jib body is fixed to the extended position with respect to the jib mounting frame body. This point is the same as the above-mentioned conventional technique.

However, the operation method of the jib added to the telescopic boom of the present invention is such that the jib body is interposed between the jib body and the jib attachment frame body, and the jib body is extended to the front surface of the jib attachment frame body. Forced rotation of the jib body about the horizontal support shaft between a position and a downward bending position where the longitudinal direction of the jib body is substantially parallel to the rotation axis of the rotation connecting device of the jib mounting frame. By the hydraulic cylinder, the jib mounting frame and the jib body are rotated and fixed in the downward bending position where the longitudinal direction of the jib body is substantially parallel to the rotation axis of the rotation coupling device of the jib mounting frame. After that, the jib mounting frame is rotated about the pivotal coupling device from the reversal position to the front position or from the front position to the reversal position. It does not move and the tip of the jib body is small. It can be rotated around the enclosure, and the jib can be safely extended and stored in a small space.
Further, when the jib attachment frame is rotated about the rotation connecting device, the inclination of the jib body hardly changes, so that the force required for the rotation can be small.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for operating a jib added to a telescopic boom according to the present invention will be described below with reference to FIGS. In FIGS. 1 and 5, reference numeral 1 denotes a telescopic boom mounted on a swivel base (not shown) mounted on a traveling vehicle so as to be capable of swinging up and down. Reference numeral 2 is a jib, and the jib 2 is composed of a jib mounting frame 4, a jib body 7, and a hydraulic cylinder 9. Frame 4 for mounting the jib
Between the front position (the position shown in FIG. 3) of the front end of the telescopic boom 1 and the inverted position (the position shown in FIGS. 1, 2 and 4) rotated 180 ° from the front position. One side of the base portion of the telescopic boom 1 is detachably attached to the one end portion of the telescopic boom 1 via the pivotal coupling device 3 so as to be pivotable in the lateral direction, and the telescopic boom is attached to the other side of the base portion. 1
A releasable solid-state device 5 for fixing the jib attachment frame 4 to the front position is provided between the tip end portion and the other side of the pivot joint device 3.

As can be understood from FIG. 5, the pivotal connecting device 3 includes brackets 10 and 11 projecting from upper and lower positions on one side of the base of the jib mounting frame 4, respectively, and a tip portion of the telescopic boom 1. Side brackets 12 and 1 projecting from the upper and lower positions, respectively
3 and pins 14 and 15 for connecting the bracket 10 and the bracket 12 and the bracket 11 and the bracket 13 are provided. In a state where the brackets are connected by the pins 14 and 15, the rotation determined by the pins 14 and 15 is provided. Jib mounting frame 4 centered on the axis 3C
Becomes rotatable between the front position and the inverted position, and when the pins 14 and 15 are removed to disconnect the brackets from each other, the rotary connecting device 3 is released and the jib mounting frame 4 is released. It can be detached from the tip of the telescopic boom 1.

In the present embodiment, as will be described later, a horizontal sheave support shaft is formed on the bracket 10 of the jib attachment frame 4 on the bracket 10 so as to be coaxial with the rotation axis 3C of the rotation coupling device 3. Due to the protruding configuration of the pin 16, the pin 14 is inserted from below and the pin 15 is inserted from above to connect the respective brackets.

The fixing device 5 includes brackets 17 and 18 projecting from the upper and lower positions on the other side of the base of the jib mounting frame 4, and brackets projecting from the upper and lower positions on the other side of the distal end of the telescopic boom 1. 19 and 20, and bracket 17 and bracket 19 and bracket 18 and bracket 20
Are provided with pins 21 and 22, respectively.

The jib body 7 has its base end portion attached to the lower front end of the jib attachment frame 4 via a horizontal support shaft 6 so as to be vertically rotatable. The hydraulic cylinder 9 is interposed between the jib body 7 and the jib mounting frame body 4, and the jib body 7 extends to the front surface of the jib mounting frame body 4 in the extended position (see FIGS. 1 and 3). And the downward bending position in which the jib body is substantially parallel to the rotation axis 3C of the rotation coupling device 3 of the jib attachment frame 4 (shown in FIGS. 2 and 2). Between the positions (1) and (2), the jib body 7 is driven to rotate around the horizontal support shaft 6. In the case of the present embodiment, the hydraulic cylinder 9 is interposed between the upper left and right positions of the jib mounting frame 4 and the base end upper left and right positions of the jib body 7, respectively.

Reference numeral 23 denotes a horizontal sheave rotatably attached to the upper end of the horizontal sheave support shaft 16 provided on the bracket 10 of the jib attachment frame 4. A wire 24 has a base end fixed to a boss 25 pivotally supported by a horizontal sheave support shaft 16 below the horizontal sheave 23, and a tip end thereof closely opposed to a wire rope groove of the horizontal sheave 23. It is a rope stopper (see Fig. 5).

Reference numeral 26 is a guide sheave provided at a proper position on the upper side of the telescopic boom 1, and 27 is a guide sheave rotatably supported by a bracket 28 provided so as to project above the jib mounting frame 4. Reference numeral 29 is a guide sheave provided above the base end of the jib body 7. 30 is a jib tip pulley. Reference numeral 31 is a wire rope drawn out from a jib winch (not shown) provided on the swivel base, and is hung around the guide sheave 26, the horizontal sheave 23, the guide sheave 27, the guide sheave 29, and the jib tip pulley 30 in this order. Then, the tip thereof is connected to the jib hook block 32. A seat 33 is provided at the tip of the jib body 7 and the jib hook block 32 is wound up and is in contact with the jib hook block 32.

Reference numeral 34 denotes a wire rope (not shown in the drawing) drawn from a main winch (not shown) provided on the swivel base to the upper end of the telescopic boom 1 and the end pulley 30 of the telescopic boom 1 to the tip of the telescopic boom 1. ) Is a main hook block suspended from the telescopic boom 1 at the tip thereof.

The jib mounting frame 4 is rotated and folded back with respect to the telescopic boom 1 in a contracted state around the rotary coupling device 3 and the jib body 7 is set to the extended position with respect to the jib mounting frame 4. In the opened state (states of FIG. 1 and FIG. 4), the base end portion one side proper position of the jib body 7 and the outer boom 1a one side proper place of the telescopic boom 1 facing the one side proper place, and the jib body 7 tip portion. One side suitable place and telescopic boom 1 facing it
Releasable connecting devices 35 and 36 for connecting and holding the jib body 7 to the outer boom 1a are provided between appropriate positions on one side of the outer boom 1a. (See FIG. 4).

The pressure oil for driving the hydraulic cylinders 9 and 9 is a hose reel 37 provided at an appropriate position on one side of the outer boom 1 a of the telescopic boom 1 and a two-line hose 38 wound around the hose reel 37. Via an operation valve of a driver's seat (not shown) of the swivel base to the hydraulic cylinders 9 and 9 so that the hydraulic cylinders 9 and 9 can be expanded and contracted by operating the operation valve. It has become.

Next, the operation of this embodiment will be described.
The jib 2 has a frame 4 for mounting the jib in its stored state.
In the reverse position and the jib body 7 in the extended position (the state shown in FIGS. 1 and 4), the connecting devices 35 and 36 are connected, and the rotary connecting device 3 is removed. Is connected to one side surface of the outer boom 1a of the telescopic boom 1 in an inverted state, and in this state, the telescopic boom 1 can be extended and retracted and raised and lowered to perform a crane operation by the main hook 34.

When the jib 2 is added to the tip of the telescopic boom 1 from the stored state of the jib 2, (1) the telescopic boom 1 is contracted and the rotary coupling device 3 is coupled. (2) Release the connecting devices 35 and 36. This release is
The structure in which the coupling devices 35 and 36 are formed by relative movement of the jib 2 in the extension direction of the telescopic boom 1 with respect to the outer boom 1 is achieved by slightly extending the telescopic boom 1. In the state where the coupling devices 35 and 36 are released, the jib 2 is coupled to the tip end portion of the telescopic boom 1 only by the pivotal coupling device 3, and the horizontal support shaft 6 of the jib body 7 with respect to the jib mounting frame 4 is connected. The rotation around is restricted by the hydraulic cylinder 9.

(3) Next, the telescopic boom 1 is raised at an appropriate angle. This elevation angle allows the jib body 7 to move to the horizontal support shaft 6
The elevation angle is such that the tip of the jib 2 does not interfere with the ground surface when it is rotated downward around the center. (4) The hydraulic cylinder 9 is extended to drive the jib body 7
The longitudinal axis of which is the rotational axis 3C of the rotational coupling device 3.
It is rotated to a downward bending position which is substantially parallel to. In this state, it is fixed by the hydraulic cylinder 9. (State of FIG. 2)

(5) Next, the wire rope 31 is wound by a winch for jib, and the hook block 3 for jib is used.
2 is seated on the seat 33 at the tip of the jib 2, and the wire rope 31 is further wound. At this time, the horizontal sheave 23
The tension of the wire rope 31 hung around in a U shape causes the jib attachment frame 4 to rotate around the rotation connecting device 3 to the front position of the tip portion 1 of the telescopic boom 1. In this pivoting movement, the longitudinal axis of the jib body 7 is pivotally connected 3
Since it is maintained substantially parallel to the rotation axis 3C, the rotation can be performed with a relatively small turning force, and the tip of the jib 2 (the tip of the jib body 7) makes a small rotation trajectory during the rotation. To do.

(6) The jib mounting frame 4 is the telescopic boom 1
After rotating to the front position of the tip of the hydraulic cylinder 9, the hydraulic cylinder 9 is driven to contract, and the jib body 7 is moved from the downward bending position with respect to the jib mounting frame 4 to the extending position (position in FIG. 3) to the horizontal support shaft 6 Rotate around.

(7) Next, the telescopic boom 1 is laid down, and the fixing device 5 connects the other side of the tip portion of the telescopic boom 1 of the jib mounting frame 4 to each other. In this way, the jib 2 is added to the tip of the telescopic boom 1 from the retracted position. Then, the telescopic boom 1 is undulated, telescopically and swiveled,
The jib hook block 32 hung at the tip of the jib 2 is used for crane work. At this time, the tilt angle of the jib body 7 can be adjusted by driving the hydraulic cylinder 9 to extend and contract from below (the driver's seat of the swivel), so that various crane operations can be accommodated. Of course, between the jib main body 7 and the jib mounting frame 4, a releasable connecting means for locking the jib main body 7 at arbitrary plural tilt positions is provided, and by locking this connecting means, crane work can be performed. The hydraulic cylinder 9 may be made to have a small output by causing the connecting means to carry the force that sometimes acts on the hydraulic cylinder 9. When the jib 2 is replenished from the additional position (the position shown in FIG. 3) to the retracted position, the above (1)-
The operation procedure of (7) may be reversed. In this case, even if the operation procedure (5) is reversed, the jib attachment frame body 4 does not rotate from the front surface position of the tip end portion of the telescopic boom 1 to the inversion position. , As follows.

(5 ') After loosening the wire rope 31 slightly, the telescopic boom 1 is slightly buffered to make a swing motion (which can be achieved by swinging the swivel base), and the jib mounting frame 4 is rotated by this impact. The movable coupling device 3 is rotated in the direction of the reversal position, or the telescopic boom 1 is swung after the tip of the jib body 7 is attached to the ground, and the swivel mechanism 4 is used to swivel the jib mounting frame 4. Or turn the jib mounting frame 4 by rotating it in the direction of the reversing position or by a worker located on the ground putting an iron rod on the tip of the jib body 7 and twisting the jib body 7. The dynamic coupling device 3 is rotated in the direction of the reversal position. After a predetermined amount of rotation is achieved in this way, the turning force in the reversing position direction is generated by the weight of the jib 2, so that the wire rope 31 is gradually loosened to bring the jib mounting frame 4 to the reversing position. is there.

In the above embodiment, the wire rope 31 is wound around the end of the jib 2 via the horizontal sheave 23, and the tension of the wire rope is rotated to rotate the jib mounting frame 4 from the reverse position to the front position. Although it is used as a power source, this is not a requirement of the present invention. The jib attachment frame 4 is rotated from the inverted position to the front position or from the front position to the inverted position when the jib body 7 is rotated downward relative to the jib attachment frame 4 (the longitudinal direction of the jib body 7). Since the axis is at a position substantially parallel to the rotation center of the rotation coupling device 3, the rotation can be performed with a relatively small force, so that the worker can move the jib body 7 from the ground with a steel bar or the like. It can also be easily twisted.

[0040]

In any case, the operation method of the jib added to the telescopic boom of the present invention is such that the jib body is moved by the hydraulic cylinder interposed between the jib body and the jib mounting frame.
After forcibly rotating and fixing the jib mounting frame body in the downward bending position whose longitudinal direction is substantially parallel to the rotation axis of the rotation coupling device of the jib mounting frame body, center the jib mounting frame body around the rotation coupling device. Since it is designed to rotate from the reverse position to the front position or from the front position to the reverse position, the tip part of the jib body does not swing in the front-back direction, and the tip part of the jib body is within a small range. It can be swiveled, and the jib can be safely extended and stored in a small space. Further, when the jib mounting frame is rotated about the rotation connecting device, the inclination of the jib body hardly changes, so that the force required for the rotation can be small.

[Brief description of drawings]

FIG. 1 is an explanatory view for explaining a method of operating a jib added to a telescopic boom according to the present invention, which is a side view of the jib in a retracted state.

FIG. 2 is an explanatory view for explaining a method of operating a jib added to the telescopic boom according to the present invention, which is a side view showing a state in the middle of adding the jib.

FIG. 3 is an explanatory view illustrating a method of operating a jib added to the telescopic boom according to the present invention, and is a side view showing a state in which the jib is added to the tip of the telescopic boom.

4 is an explanatory view for explaining a method of operating the jib added to the telescopic boom according to the present invention, and is a plan view of FIG. 1. FIG.

5 is an explanatory view for explaining a method of operating the jib added to the telescopic boom according to the present invention, which is a left side view of FIG. 1. FIG.

FIG. 6 is an explanatory view showing a conventional example, which is a side view of a stored state of a jib.

FIG. 7 is an explanatory view showing a conventional example and is a plan view of the same.

FIG. 8 is an explanatory view showing another conventional example, in which the jib is expanded and contracted.
Side view showing a state in which it is added to the tip of the boom

[Explanation of symbols]

 1 Telescopic boom 2 Jib 3 Rotating connecting device 4 Jib mounting frame 5 Fixing device 6 Horizontal support shaft 7 Jib body 3C Rotating shaft center of rotating connecting device 3 9 Hydraulic cylinder

Claims (1)

[Claims] 1. A jib 2 capable of taking a splicing position that is added to the front surface of the telescopic boom 1 and a folding position that is folded along the side surface of the telescopic boom 1, and in particular, the front surface of the front surface of the tip portion of the telescopic boom 1. Position and one side of the base of the telescopic boom 1 to the one end of the telescopic boom 1 so that the telescopic boom 1 can be pivoted to the side of the telescopic boom 1 by about 180 ° from the front position. A frame 4 for jib attachment which is detachably attached by means of the rotary coupling device 3 between the other side of the base part thereof and the other side of the tip end of the telescopic boom. The jib mounting frame body 4 provided with a releasable fixing device 5 for fixing the to the front position of the telescopic boom 1, and the base end portion of the jib mounting frame body 4 in the vertical direction via the horizontal support shaft 6 on the jib mounting frame body 4. A jib body 7 of an appropriate length attached so as to be rotatable, And, interposed between the jib body 7 and jib mounting frame 4, a jib body 7 in the configuration to become jib operating method from the hydraulic cylinder 9 for driving rotation around the horizontal support shaft 6 With the hydraulic cylinder 9, the extension position where the jib body 7 is extended to the front surface of the jib attachment frame 4 and the longitudinal direction of the jib body 7 are the rotational coupling device of the jib attachment frame 4. Three
It is configured such that it can be forcibly rotated between a downward bending position which is substantially parallel to the rotation axis 3C of the above, and when the attitude of the jib 2 is changed from the folding position to the extending position or from the extending position to the folding position. First, the jib body 7 is pivotally fixed to the jib mounting frame body 4 in the downward bending position by the hydraulic cylinder 9, and then the jib mounting frame body 4 is pivoted about the pivot axis 3C of the pivotal coupling device 3. It is characterized in that the jib body 7 is turned to the extension position with respect to the jib attachment frame 4 by the hydraulic cylinder 9 by an appropriate means. How to operate the jib that is added to the characteristic telescopic boom.