JPH0485298A - Jib-provided telescopic boom - Google Patents

Abstract

PURPOSE:To turn a jib main unit-provided frame body in a horizontal surface by elevating a jib main unit, placed in an upper rising position, to an extension position or a storage position relating to the frame body by a jib derricking hydraulic cylinder. CONSTITUTION:In a storage condition of a jib main unit, by contracting jib derricking hydraulic cylinder 4 to turn a frame body 2 rearward, the frame body 2 is retracted by a considerable length from a boom point end part 14 to prevent a turning locus L of a point end of the frame body 2 from protruding to the outside from a turning locus M of the boom point end part 14 at turning time during running of a vehicle. In order to displace a jib from a storage position to an extension position in front of the boom point end part 14, a telescopic boom 1 is extended by the jib derricking hydraulic cylinder 4 from an almost horizontal attitude condition to oppose each bracket 25, 25 in a side of a turn connecting device 5 in the frame body 2 to each bracket 15, 15 in a side of a boom point end part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is capable of displacing the jib between an added position where the jib is added to the front of the telescopic boom tip and a stored position where the jib is folded along the side of the telescopic boom. This invention relates to a telescopic boom with a jib.

(Prior art) For example, a telescopic boom used in a truck crane has
Typically, a jib is attached to the tip of the telescoping boom when in use, and is folded and stored along the side of the telescoping boom when not in use.

In this type of telescopic boom with a jib, when adding the jib from the storage position along the side of the boom to the front position of the boom tip, the conventional method is to swing the jib forward through the side of the boom. A downward swing method is used in which the jib is swung forward through the bottom of the boom. By the way, when attaching the jib to the tip of the boom, the horizontal jib swinging method requires a large space on the side of the boom for swinging the jib. The downward swing method is more advantageous.

As an example of a telescopic boom with a jib that employs the jib downward swinging method, the one shown in FIG. 8 has been known (Japanese Patent Application Laid-Open No. 63-27396). This eighth
In the known telescopic boom with a jib shown in the figure, a jib main body 103 is detachably attached to a boom tip 114 via a frame 102 for attaching the jib. The frame body 102 is pivotally attached to one side of the boom tip 114 by a rotation coupling device 105, and forms a rotation mark within an angle range of approximately 180° from the front position to the side position of the boom tip. . Moreover, the base end of the jib body 103 is pivotally attached to the distal end of the frame 102 via a horizontal shaft 107, so that the jib body 103 can freely swing back and forth.

Further, a jib raising/lowering hydraulic cylinder 104 is interposed between the frame body 102 and the jib body 103 for raising and lowering the jib body 103 with respect to the frame body 102. and,
In the telescopic boom with a jib shown in FIG. 8, in order to displace the jib from the storage position along the side of the telescopic boom lot to the addition position where it is added to the front of the boom tip 114, first the frame to which the shib body 103 is connected is With the body 102 pivotally connected to one side of the boom tip 114 by the rotational coupling device 105, the telescopic boom 101 is raised by an appropriate angle, and then the jib hoisting hydraulic cylinder 104 is extended to raise the jib body 103. The frame body 102 with the jib body is hung at an angle of approximately 18 degrees around the rotation axis line L-L of the rotation coupling device 105 by the rotation mechanism 110.
The jib body 103 is rotated forward by 0° (as shown by the chain line), and then the jib hoisting hydraulic cylinder 104 is contracted.
The frame body 1 is raised up and the telescopic boom 101 is lowered.
The jib addition work is completed by fixing the opposite side of the boom 02 to the opposite side of the boom tip 114 using a fixing device (connecting pin). In addition, in order to store the jib in the replenishment position on the side of the telescopic boom, the procedure is reversed to that described above.

(Problem to be Solved by the Invention) However, in the known telescopic boom with jib shown in FIG. Since it has a considerable length, it is necessary to raise and lower the telescopic boom 101 every time the jib is swung out or retracted. That is, when rotating the jib body 103 downward, it is necessary to raise the telescopic boom 101 to a predetermined angle in order to prevent the tip of the jib body 103 from contacting the ground, and the frame 102 must be raised to a predetermined angle. When fixing (or releasing) the telescopic boom 1
There was a problem in that it was necessary to lower the boom 101 to a low position within the reach of a person, making it troublesome to operate the telescopic boom 101 to raise and lower it. Furthermore, when swinging the jib forward, it is necessary to raise the telescopic boom 101 to a predetermined angle when the jib body 103 is suspended, so the frame body 102 is pivotally attached to the boom tip 114. The rotation axis LL line of the rotation coupling device 105 is inclined by a considerable angle θ with respect to the vertical direction P. Therefore, it becomes difficult to operate when rotating the frame 102 with the jib body 103 from the side position of the boom tip 114 to the front position shown by chain lines 102' and 103' about the rotation axis LL line. There were also problems.

In view of the problems of the conventional telescopic boom with a jib described above, the present invention has been developed to provide a telescopic boom that can be extended or retracted when the jib is added to the front position of the tip of the boom or when the jib is retracted along the side of the telescopic boom. To provide a telescopic boom with a jib, which can perform these operations without raising and lowering the boom, and can make each operation easier when adding a jib or storing a jib.

(Means for Solving the Problems) The present invention provides an additional position where the shib body is added to the front of the tip of the telescopic boom via a frame for mounting the jib, and along the side of the telescopic boom. In a telescopic boom with a jib that can be displaced between a folded and stored position, the frame body connects one side of the base of the frame body and one side of the boom tip to the boom tip. It can be separated by a releasable rotational coupling device, and when coupled, the frame body has an angle of about 18 from the front position of the boom tip to the side position of the boom tip.
The side of the frame base on the side opposite to the pivot joint and the side of the boom tip on the opposite side to the pivot joint when the frame body is in the front position of the boom tip. and installed in such a way that they can be releasably fixed by a fixing device that can be fixed and released,
The proximal end of the jib body is attached to the frame with a horizontal axis such that the jib body can pivot upwardly from a retracted position along the side of the telescopic boom with respect to the frame at a side position of the boom tip. The present invention is characterized in that a hydraulic cylinder for shib raising and lowering is provided between the frame body and the jib body, and is capable of raising and lowering the jib body upwardly with respect to the frame body when the jib is stored.

(Function) According to the telescopic boom with jib of the present invention, the frame for mounting the shib can be rotated within an angle range of approximately 180° between the front position and the side position of the boom tip using the rotation coupling device. In addition, the jib body can be rotated upward from the storage position along the side of the telescopic boom relative to the frame, and the jib body is attached to the frame between the frame and the jib body. On the other hand, a hydraulic cylinder for hoisting the shib is installed, so when displacing the jib from the stowed position to the adding position or from the adding position to the stowed position, the telescopic boom is maintained in a horizontal position and the boom is The jib body is erected upward by a jib hoisting hydraulic cylinder against the frame attached to the front or side position of the tip, and then the jib body is Rotate the attached frame body around the rotation wheel center of the rotation coupling device from the front position of the boom tip to the side position (or from the side position of the boom tip to the front position), and then return it to the upward standing position. A certain jib body can be raised and lowered with respect to the frame body to a replenishing position or a storage position using a hydraulic cylinder for shib raising and lowering. As described above, with the jib-plated telescopic boom of the present invention, the jib swing-out operation can be performed while maintaining the telescopic boom in a horizontal position, and the frame body can be rotated between the front position and the side position of the boom tip. When moving, the telescopic boom is in a horizontal position, so that the rotation axis of the rotation coupling device is in a vertical position, and the frame body with the jib body can be rotated within a horizontal plane.

(Effects of the Invention) According to the telescopic boom with a jib of the present invention, when displacing the jib between the addition position and the storage position, the jib body can be moved through the upper part of the boom tip. Even if the work space is made smaller and the work space can be made smaller during jib displacement operations, the telescopic boom can be maintained in a horizontal position, so the telescopic boom cannot be raised or lowered during jib displacement operations. There is an effect that the jib displacement work can be easily performed since there is no need for any operation. Furthermore, when displacing the jib, the rotation axis of the rotation coupling device can be maintained in a vertical position.
The frame body with the jib body can be rotated in a horizontal plane, no unnatural force is applied to the rotation coupling device part, and the frame body with the jib body can be rotated with a relatively small force. It's also effective.

(Example) The present invention will be described in detail with reference to FIGS. 1 to 7. A telescopic boom with a jib according to this example is used for a truck crane. That is, the illustrated truck crane has the base end of a telescopic boom 1 pivotably mounted on a swivel base B provided on a vehicle A, and the telescopic boom 1 can be raised and lowered by a hydraulic cylinder C for raising and lowering the boom. The jib main body 3 is configured to be removably attached to the boom tip 14 via the jib attachment frame 2.

In this embodiment, the telescopic boom 1 has a total of five boom units (11, 12A to 12C, 13) successively connected in a telescopic manner. (omitted).

As shown in FIG. 3, the boom tip portion 14 (the tip portion of the tip boom 13) is provided with two upper and lower brackets 15, 1516 and 16 on its left and right side portions 14a14b, respectively. These two left and right brackets are 15.15 (
16, 16) are respectively spaced apart from each other in the vertical direction, and in this embodiment, two brackets designated by reference numeral 15 constitute a part of a rotational coupling device 5, which will be described later.
Two brackets indicated by 6 constitute a part of a fixing device 6, which will be described later.

The frame body 2 for mounting the jib is constructed by connecting two left and right side plates 20° 20 at the base 21 side with a connecting piece. The base 21 of the frame 2 has a rectangular frame shape, and a rotation coupling device (described later) is provided on one left and right side 21a of the base 21.
There are two brackets 25, 25 forming part of the fixing device (described later) 26, 25 on the other left and right sides 21b of the base 21, and two bladders 26, 26 forming a part of the fixing device (described later) 6, respectively. It is provided. These total 4 bladders/7
25, 25, 26, and 26 are a total of four brackets 15 provided on the left and right sides of the boom tip 4 when facing the base 21 of the frame 2 or the front surface of the boom tip 14.
．． 15.16. +6 respectively (can be connected).

The frame body 2 can be pivoted by a rotation coupling device 5 that can be freely disconnected from the boom tip 14 so that it can rotate within a range of about 1806 degrees from the front position to the side surface position of the boom tip 14. . The rotation coupling device 5 includes two brackets 25.25 provided on one side 21a of the frame base 21, two brackets 15.25 provided on one side 14a of the boom tip 14, and It is composed of two connecting pins 17, 17 (FIG. 3) that connect each bracket 25, 25 on the body side and each bracket 15, 15 on the boom tip side, respectively. As shown in FIGS. 5 and 6, this rotational coupling device 5 is in a state in which each bracket 25.25 on the frame body 2 side is overlapped with each bracket 15.15 on the boom tip 14 side. By pivoting the upper and lower two sets of brackets 15.25 with the connecting pins 17.17, the frame body 2 is aligned with the side position of the boom tip 14 (the position shown by the solid line in FIGS. 5 and 6) and the boom. It can be rotated between the front position of the tip portion 14 (the position indicated by the chain line 2'). Moreover, this rotational coupling device 5 has both coupling pins 17.
．． By removing 17, the connection between the boom tip 14 and the frame body 2 can be released. Also, frame body 2
When the boom is pivotally connected to the boom tip 14 by the rotation coupling device 5, the axes of the upper and lower coupling bins 17, 17 are oriented perpendicular to the boom length direction when viewed from the side of the telescopic boom 1, For example, when the telescopic boom 1 is maintained in a horizontal position, the rotation axis of the rotation coupling device 5 is directed in the vertical direction.

The side portion 21b of the frame base 21 on the side opposite to the pivot attachment side and the side portion 14b on the side opposite to the pivot attachment side of the boom tip portion 14 can be fixed by a fixing device 6 that can be released from fixation. This fixing device 6 basically consists of the above-mentioned rotational coupling device 5.
It has the same structure as the upper and lower brackets 16.18 provided on the side 14b of the boom tip 14 on the side opposite to the pivot joint, and the upper and lower brackets 16.18 provided on the side 21b of the frame base 21 on the side opposite to the pivot joint. 2
one bracket 26.26 and a bracket 162 on each side
6, respectively. This fixing device 6 is attached to both connecting pins 2 with the frame 2 positioned in front of the boom tip 14.
By connecting the brackets (16 and 26) on each side by 7.27, the frame 2 cooperates with the rotational connection device 5.
can be fixed at the front position of the boom tip 14.

In this embodiment, the jib main body 3 has a two-stage telescopic structure having a base side jib 31 and a tip side jib 32, and the base side jib 31 and the tip side jib 32 are connected to a hydraulic cylinder for extending and retracting the jib. 33 so that it can be expanded and contracted. This jib main body 3 has two jib support means 8A and 8, front and rear.
B allows it to be supported at a retracted position along the side surface of the proximal boom 11. Further, the front jib support means 8A supports the base side of the base side jib 31 at a position near the tip of the base end boom 11, and the rear side jib support means 8B supports the front side of the front side jib 32 at a position near the tip of the base boom 11. 11 is supported at a position closer to the base side. Further, the front jib support means 8A supports the front side jib 32 by the rear jib support means 8B.
1, by contracting the base side jib 31 with respect to the tip side jib 32, it automatically engages and locks, and conversely, the front side jib support means 8
When the base side jib 31 is extended relative to the front side jib 32 from the locked state of the front side jib support means 8A and the rear side jib support means 8B, the front side jib support means 8A is automatically unlocked. Note that a receiving roller 10 is provided on the side surface of the base end boom 11 for receiving the base side jib 31 of the jib main body 3 in the retracted position. This receiving roller IO is positioned so as to support a position closer to the base side than the center of gravity of the jib main body 3, and serves as a support when the base side jib 31 is expanded and contracted with respect to the tip side jib 32 in the retracted position. It acts as.

The jib main body 3 has its base end (base end of the base side jib) 3a
is placed between the side plates 20 and 20 of the frame 2,
The jib main body proximal end 3a is pivotally mounted at the tip 22 of the frame 2 (the tip of the side plates 20, 20) through the horizontal axis 7, and the jib main body 3
The frame body 2 and the frame body 2 can rotate relative to each other about the horizontal axis 7 over a range of at least 90°.

A jib hoisting hydraulic cylinder 4 is interposed between the frame body 2 and the jib body 3 to raise and lower the jib body 3 with respect to the frame body 2. This jib hoisting hydraulic cylinder 4 is used in pairs on the left and right, and the base end of each cylinder tube 41.41 is pivotally supported on the base side upper end of the frame side plate 20.20 by a shaft 43.43, Also, each cylinder rod 42, 42
The tips of the shafts 44.4 are attached to the outer surface of the proximal jib 31, respectively.
It is supported by 4. In this embodiment, the hydraulic cylinder 4 for shib hoisting also serves as a tension run device for maintaining the jib body 3 at a predetermined tilt angle, and the single hydraulic cylinder 4 for jib hoisting is used for swinging out the jib body and for tension run. It is used for. Further, in this embodiment, the jib hoisting hydraulic cylinder 4.4 not only raises and lowers the jib body 3 relative to the frame body 2, but also allows the frame body 2 to pivot relative to the jib body 3. It has become. That is, in a state where the frame body 2 is separated from the boom tip 14 (in this case, the shib body 3 is supported on the side surface of the base end boom 11 by the front and rear jib support means 8A and 8B). When the jib hoisting hydraulic cylinder 4.4 is extended or contracted, the frame body 2 can swing back and forth with respect to the jib body 3 about the horizontal axis 7. In addition, in this embodiment, the jib hoisting hydraulic cylinder 4°4 is used to attach the jib body 3 to the side surface of the telescopic boom 1 with the frame body 2 fixed to the side surface of the boom tip 14 as shown in FIG. It is possible to rotate from the storage position along the vertical posture shown by chain lines 3' and 3' to a rotation position (for example, 120 degrees in total rotation angle) by adding a tilt angle (for example, 30 degrees). , has its telescopic stroke.

In FIG. 6, reference numeral 9 denotes a turning mechanism for automatically rotating the frame 2 located at the side of the boom tip 14 to the front position of the boom tip 14. The turning mechanism 9
has two rods 91, 92 and one rope 93, and when rotating the frame body 2 to the front position of the boom tip, the rods 91, 92 and the rope 93 are 6
By assembling it as shown by the solid line in the figure and extending the telescopic boom 1 to the position shown by the chain line in this state, the frame body 2 can be automatically rotated to the front position of the boom tip shown by the chain line 2'. It looks like this.

Next, the jib operation method for the jib-equipped telescopic boom of the illustrated embodiment will be explained. When the jib-equipped telescopic boom is not in use, the frame body 2 is moved from the boom tip 14 as shown in FIGS. 1 to 3. The base end boom 11 is separated and the jib main body 3 is supported by the two front and rear jib support means 8A and 8B.
Support it in the storage position on the side. In this state, the telescopic boom 1 is extendable and retractable, and it is naturally possible to carry out crane work using only the telescopic boom 1. In addition, in this jib body storage state, by contracting the jib hoisting hydraulic cylinder 4 and rotating the frame body 2 rearward, the frame body 2 is
is now retracted by a considerable length from the boom tip 14, and when turning while the vehicle is running, the turning trajectory L of the tip of the frame 2 (FIG. 2) or the turning trajectory M of the boom tip 14 is changed.
Become more outwardly protruding.

To displace the shib from the storage position to the replenishment position in front of the boom tip 14, first extend the jib hoisting hydraulic cylinder 4 from the state shown in FIG. 1 (the telescopic boom 1 is maintained in a substantially horizontal position). Then, as shown in FIG. 4, each bracket 25.
25 to face each bracket (15.15) on the boom tip 14 side. In addition, in this state, the bracket y) on the frame body 2 side
25.25 and the bracket 15 on the boom tip 14 side are not vertically overlapped. Next, from the state shown in FIG. 4 (fixed to the base end boom 11 by the front side shib 32 or the rear side shib support means 8b), the jib extension/retraction hydraulic cylinder 33 is slightly extended to the base side. Slide the jib 31 forward and attach each bracket 25, 25 on the rotation coupling device 5 side of the frame 2 to the boom tip 14.
After complete polymerization of the side brackets 15 and 15, both brackets 15 and 25 are pivotally connected using connecting pins 17 and 17, respectively (as shown by solid lines in FIG. 5). In this state, the front side jib support means 8A is automatically in the opening 2 release state, and when the rear side jib support means 8B is subsequently unlocked, the jib body 3 is moved upward relative to the frame body 2. It becomes possible to turn. After assembling the swing mechanism 9 between the telescopic boom l and the frame 2 as shown in FIG. 6, the jib hoisting hydraulic cylinder 4 is contracted and The jib main body 3, which was in the position), is raised upward to a vertical position as shown by the chain line 3'. Next, when the telescopic boom 1 is extended by a predetermined length from this state and the boom tip 14 is advanced to the position shown by the chain line 14' in FIGS. 5 and 6, tension is generated in the swing mechanism 9. , the boom tip 14 with the frame body 2 in a vertical position together with the jib body 3
The boom is rotated within an angular range of about 180 degrees from the side position of the boom to the front position of the tip of the boom shown by the chain line 2'.

At this time, since the telescopic boom 1 is maintained in a substantially horizontal position, the rotational axis of the rotational coupling device 5 is oriented almost vertically, and the frame body 2 with the jib body 3 supports the rotational coupling device 5. It will rotate in the horizontal plane around the center. Moreover, since the jib main body 3 is in a vertical position near the rotation coupling device 5, the horizontal distance from the rotation axis of the rotation coupling device 5 to the center of gravity of the jib is shortened, and the rotation connection due to the weight of the jib is shortened. The moment applied to the device 5 is small, and the jib (frame with the jib body) can be rotated with a relatively small force. This is also effective in preventing damage to the rotation coupling device 5. And, the frame body 2 with the jib main body
When rotated to the front position of the boom tip 14, the bracket 26.26 on the fixing device 6 side of the frame body 2 and the bracket 16.
16 overlap each other, and by connecting both brackets 16.26 with a connecting pin 27.27, the rotation connecting device 5
The frame body 2 can be fixed in the front position of the boom tip 14 in cooperation with the boom tip 14. Then, by extending the jib hoisting hydraulic cylinder 4' (Fig. 5) which is in the contracted state, the shib main body can be rotated downward from the position indicated by the chain line 3' (
Set the appropriate tilt angle for the telescopic boom l).

Note that the swing device 9 is removed when this telescopic boom with jib is used. Furthermore, when displacing the jib main body 3 from the position where it is added to the front surface of the boom tip 14 to the retracted position along the side surface of the telescopic boom l, it is sufficient to perform the jib addition operation in the reverse order. In addition, during the shib retraction operation, when the jib main body 3 is lowered from the vertical position indicated by 3' in FIG. 5 to the retracted position along the side of the telescopic boom 1, the jib main body 3 The jib extension hydraulic cylinder 33 is extended and the rear jib support means 8B is positioned, and then the rear jib support means 8B is positioned. The jib support means 8B is locked, and then the rotation coupling device 5
After removing the connecting pins 17 and 17, the jib extension/retraction hydraulic cylinder 33 is retracted to automatically lock the front jib support means 8A, and the jib is fixed at the retracted position. Also, in this state, when the jib hoisting hydraulic cylinders 4, 4 are contracted, the frame body 2 rotates upward, and the tip of the frame body 2 retreats a considerable distance from the boom tip 14, which is in the most contracted state. I will do/become like that.

As described above, according to the illustrated telescopic boom with a jib, when adding a jib to the front face of the boom tip or storing the jib along the side of the telescopic boom 1 from the added position, the jib body 3 is attached to the telescopic boom. 1, the work space for displacing the jib body 3 may be small. Furthermore, since the jib displacement operation can be performed while maintaining the telescopic boom 1 in a substantially horizontal position,
The jib displacement operation becomes easy. Furthermore, since the jib can be rotated with the jib main body 3 standing in a vertical position and with the rotation axis of the rotation coupling device 5 facing vertically, the jib rotation operation can be performed. You will be able to do this with less force.

In addition, with this telescopic boom with a jib, it is possible to perform crane work by suspending a load hook from the tip 14 of the telescopic boom 1, but in that case, the jib main body 3 can be moved as shown in Fig. 7. It can be used as That is, when the jib main body 3 is attached to the boom tip 14 and the jib hoisting hydraulic cylinder 4 is contracted, and the telescopic boom l is raised to the use position in this state, the jib main body 3 moves to the inclination of the telescopic boom l. It will protrude in the opposite direction.

Therefore, in this state, the boom bending moment or overturning moment during crane work is alleviated, and the range of crane work can be expanded. As shown in FIG. 7, a heavy load W may be suspended from the tip 32 of the jib body 3 that protrudes in the opposite direction to the direction of inclination of the telescopic boom, or the tip 32 of the jib body 3 may be attached to a winch D. If the crane is pulled by the crane, the boom bending moment and overturning moment during crane work will be further alleviated, and the crane lifting performance will be further improved.

In addition to the above-mentioned embodiments, the telescopic boom with jib of the present invention can adopt the following embodiments.

(a) The jib hoisting hydraulic cylinder 4 also serves as a tensioning device for the jib body 3, and is of a tension type; however, in other embodiments, it may be used exclusively for jib hoisting. Moreover, a compression type hydraulic cylinder may also be used.

(b) The permissible rotation range of the jib body 3 relative to the frame 2 is:
The angle can be within a range smaller than 90 degrees (for example, about 45 degrees), and the jib hoisting hydraulic cylinder 4 can also have a telescopic stroke corresponding to the permissible rotation range of the jib body. In this case, during jib displacement operation,
Although the jib body 3 is horizontally turned in an upwardly inclined state, this does not depart from the gist of the present invention.

(C) The turning mechanism 9 for horizontally turning the frame body 2 with the jib body may include, for example, an eighth
A known turning mechanism (reference numeral 110) as shown in the figure or any other suitable structure may be employed, and in other embodiments, the turning mechanism may be omitted and the frame body 2 with the jib may be manually turned horizontally. It's okay.

(D) Is a telescopic jib main body 3 adopted? In other embodiments, a non-retractable jib consisting of a single jib can be employed. Also, when using a jib body consisting of a single jib like this, in the folded position where the jib (with frame body) is along the side of the boom, the base end of the jib (base end of the frame body) should be placed behind the tip of the boom. When supporting the jib in a shifted state, the jib body is supported on the side surface of the proximal boom 11 using a receiving roller or a receiving metal fitting, and is shifted rearward, for example, manually or by wire lobe drive using a winch, and the front jib is supported. It is sufficient to engage the means 8A (see FIG. 2) and to connect the rear jib support means 8B with the pin. Furthermore, when using a jib body consisting of a single jib in this way, when the brackets 25. Both brackets (15 and 2
5) In order to avoid collision, it is best to do this while telescoping and retracting the telescoping boom.

[Brief explanation of drawings]

Fig. 1 is a side view of a truck crane equipped with a telescopic boom with a jib according to an embodiment of the present invention, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is a part of the telescopic boom with a jib shown in Fig. 1. An enlarged perspective view, Figures 4 to 6 are explanatory diagrams of how to use the telescopic boom with jib in Figure 1, Figure 7 is a side view showing another usage example of the truck crane in Figure 1, and Figure 8 is FIG. 2 is a side view of a known telescopic boom with a jib. 1... Telescopic boom 2... Frame 3... Jib body 3a... Base end portion 4... Hydraulic cylinder for jib hoisting 5 ・ ・ ・ ・ 6 ・・ ・ ・ 7 ・ ・ ・ ・ 14 ・ ・ ・ 14a 14b ・ 2 l ・ ・ ・ 21a 21b ・ 22 ・ ・ ・

Claims (1)

[Claims] 1. The addition position where the jib body (3) is added to the front of the tip (14) of the telescopic boom (1) via the jib mounting frame (2) and the telescopic boom ( A telescopic boom with a jib that can be displaced between a storage position folded along the side of the frame body (2) and a storage position folded along the sides of the frame body (2), the frame body (2) is ) can be freely separated from one side (21a) of the base (21) and one side (14a) of the boom tip (14) by means of a rotary coupling device (5) that can disconnect the frame. (2) is pivoted so that it can rotate within a range of approximately 180 degrees from the front position of the boom tip (14) to the side position of the boom tip (14), and the frame body (2) is attached to the boom tip (14). When in the front position of (14), the side part (21b) on the opposite side of the frame base (21) and the side part (14b) on the opposite side of the boom tip (14) can be released. fixing device (6
), and the proximal end (3a) of the jib body (3) is attached to the jib body (3).
3) is attached to the frame body (2) such that it can pivot upward from a storage position along the side of the telescopic boom (1) with respect to the frame body (2) located at a side position of the boom tip (14). Horizontal axis (
7), and between the frame body (2) and the jib body (3), the jib body (3) can be raised and lowered upwardly with respect to the frame body (2) when the jib is stored. Hydraulic cylinder for jib hoisting (
4) A telescopic boom with a jib characterized by the following.