JPH048152Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is the innermost boom of a telescopic boom that is formed by telescopically inserting an inner boom into an outer boom that is attached to a vehicle so as to be able to swing and raise and lower. One side of the proximal end of the jib is pivotally connected to one side of the tip of the jib, and around this pivot joint, the jib is extended to the tip of the telescopic boom, and the jib is inverted and folded along the side of the telescopic boom. Used in a telescopic boom/jib assembly, which is capable of rotating between two positions, and is provided with a locking device between the other side of the tip of the innermost boom and the other side of the proximal end of the jib to keep the jib in the extended position. This relates to a rotating device for a jib.

(Prior Art) The boom/jib assembly as described above is used in mobile cranes such as truck cranes and crawler cranes, and is used when the boom length is insufficient for crane work at the tip of the telescoping boom. By adding a jib to the tip and performing crane operations at the tip of this jib, it can handle a wide range of crane operations.

By the way, in a mobile crane equipped with this type of boom/jib assembly, when rotating the jib between the folded position and the extended position, the telescopic boom is lowered so that the surface of the jib's rotation remains horizontal. In cases where the jib can be rotated manually, a large jib rotation space is required near the ground surface, and in urban areas where such space cannot be secured, the jib may be rotated by a telescopic boom. Since there was a problem in that the jib added to the tip or added to the tip of the telescopic boom could not be removed from the tip of the telescopic boom, conventional boom/jib assemblies of this type had the above-mentioned rotation operation of the jib of the telescopic boom. A jib rotation device is installed that allows the jib to be rotated as described above while the telescopic boom is raised using telescopic force.

A conventional jib rotation device will be explained based on FIGS. 1 and 2.

First, the telescopic boom/jib assembly to which the jib rotation device is attached will be explained.

In FIGS. 1 and 2, reference numeral 1 denotes a telescoping boom in which inner booms 3 and 4 are telescopically inserted into an outermost boom 2, and this telescoping boom 1 can be rotated onto a vehicle A. It is also installed so that it can be driven up and down. A main hook block 5 is suspended from the tip of the innermost boom 4 of the telescopic boom 1 so as to be able to be driven up and down. The telescopic boom 1 can be driven to extend and retract by a telescoping drive device such as a hydraulic cylinder installed therein. Reference numeral 6 denotes a jib, and one side of the base end of the jib 6 is pivotally connected to one side of the tip of the innermost boom 4 of the telescopic boom 1, and the jib 6 is pivoted to the tip of the telescopic boom 1 around this pivot connection 7. It can be rotated between an extended extended position and a folded position in which it is inverted and folded along the side of the telescoping boom. 8 is a locking device provided between the other side of the tip of the innermost boom 4 of the telescopic boom 1 and the other side of the base end of the jib 6, and this locking device 8 is used to keep the jib 6 in the extended position. belongs to.
Reference numeral 9 denotes a sub-hook suspended from the tip of the jib 6 so as to be able to be hoisted up and down. The telescopic boom 1 and the jib 6 constitute a telescopic boom/jib assembly, and such a telescopic boom/jib assembly consists of a
When the jib 6 is inverted and folded to one side of the telescopic boom 1 from the state shown in the figure, first release the locking device 8 and then move the jib 6 roughly around the pivot connection 7.
Rotate 180° and invert and fold the telescopic boom 1 to one side.
After that, the jib 6 is attached to the outermost boom 2 of the telescopic boom 1.
It is fastened to one side with a suitable fastening means and the pivot connection 7 is removed. In this way,
The jib 6 is stored on one side of the telescopic boom 1, and crane work is performed using the main hook 5 suspended from the tip of the telescopic boom 1. When adding the jib 6 to the tip of the innermost boom 4 of the telescopic boom 1 and attempting to perform crane work using the sub-hook 9 at the tip of the jib 6, the above operating procedure is reversed. Telescoping boom and jib assemblies constructed and operative as described above are known.

Reference numeral 10 denotes a conventional jib rotation device, which includes a first link 12 having one end pivotally connected 11 to the tip end of the most advanced boom 4 of the telescopic boom 1, and a first link 13 having one end pivotally connected 13 to the right place at the proximal end of the jib. A second link 14 is provided, and the other end sides of the first and second links 12 and 14 are pivotally connected 15 to each other, and the pivot connection 15 is provided on each other end side of the first and second links 12 and 14 15 parts are
Said pivot connection 11 between the first link and the innermost boom
When the telescopic boom 1 is rotated toward the proximal end of the telescopic boom 1, the jib 6, which is in the folded position, is configured to rotate around the pivot connection 7 to the extended position, and
A pivot joint 15 connecting the other ends of the first and second links 12 and 14 and a proper position at the tip of the outermost boom 2 of the telescopic boom 1 are connected by a removable connecting rod 16. ing. The conventional jib rotation device 10 having such a configuration connects one side of the proximal end of the most advanced boom 4 to one side of the distal end with a pivot connection 7.
One end of the second link 14 is pivotally connected to an appropriate position at the proximal end of the jib 6, and the first and second links 1
After connecting the pivot joint 15 at the other end of each of the booms 2 and 14 and the appropriate position at the tip of the outermost boom 2 with a connecting rod 16,
When the telescopic boom 1 is driven to extend, the pivot connection 15
The section rotates toward the proximal end of the telescopic boom 1 around the first link 12 and the pivot connection 11 of the innermost boom 4, and as a result, the jib 6 is rotated around the pivot connection 7 to the extended position, and When the telescopic boom 1 is retracted, the jib 6 is rotated about the pivot connection 7 to the folded position.

(Problems to be Solved by the Present Invention) However, the conventional jib rotation device configured as described above has the following drawbacks. That is, after the jib 6 is rotated to the extended position as described above by the jib rotation device 10, the locking device 8 is connected between the other side of the leading end of the boom 4 and the other side of the proximal end of the jib 6.
It is necessary to hold the jib 6 in the extended position by locking it, and to also remove the connecting rod 16 so that the telescopic boom 1 can freely extend and contract. This is used when there is not enough space near the ground to rotate the jib part 6 in a substantially horizontal plane, and the jib 6 is rotated at a high place when the telescopic boom 1 is in the upright position. Therefore, when the jib 6 is in the extended position by the jib rotation device, the space near the ground surface is often so narrow that the telescopic boom 1 cannot be lowered, and the locking operation and connection of the locking device 8 is difficult. It becomes necessary to perform the removal operation of the rod 16 at a high place. The locking device 8 and the connecting rod 16 are operated by a worker who has climbed into the building or the like. In this case, the locking device 8 can be easily installed by a worker who has climbed into a building, etc., since the locking device 8 only requires the operation of a pin, etc.;
The above-mentioned operation of No. 6 was extremely dangerous because the connecting rod 16 was heavy. In addition, when rotating the jib 6 from the extended position to the folded position,
Although it is necessary to remove the locking device 8 at the same time as attaching the connecting rod 16, the operation of attaching the connecting rod 16 is also accompanied by danger in this case.

The present invention was developed in light of the fact that with conventional jib rotation devices, the connection rod 16, which is a heavy object, was always attached and removed at a high place, which was always dangerous. The present invention aims to improve the device and provide a new jib rotation device free of such risks.

(Means for Solving the Problems) In order to achieve the above object, the jib rotation device of the present invention is constructed as follows. That is, one side of the proximal end of the jib 6 is pivotally connected to one side of the tip of the innermost boom 4 of the telescopic boom 1, which is formed by telescopically fitting the inner boom into the outer boom, and this pivot connection 7 The jib 6 can be rotated between the extended position at the tip of the telescopic boom 1 and the folded position where the jib 6 is inverted and folded along the side of the telescopic boom 1. A jib rotation device used in a telescopic boom/jib assembly, which is provided with a locking device 8 for keeping the jib 6 in the extended position between the other side of the tip of the telescopic boom 1 and the other side of the proximal end of the jib. A first link 12 whose one end is pivotally connected 11 to the tip of the innermost boom 4, and a jib 6
A second link 14 having one end pivotally connected to a proper position at the proximal end of the second link 14.
The other end sides of the first and second links are pivotally connected 15 to each other, and the pivotally connected portion 15 is the pivotally connected 11 between the first link 12 and the innermost boom 4.
When the jib 6 is rotated a predetermined amount toward the proximal end of the telescoping boom around its center, the jib 6 in the folded position is rotated to the extended position, and the jib 6 is moved to the appropriate position of the first or second link 12, 14. A wire rope 1 with one end connected and the other end removably connected to the proximal end of the outermost boom 2 of the telescopic boom 1
8. The length is set so that the first link 12 can rotate a predetermined amount within the extension/contraction range of the telescopic boom, especially when its base end is connected to the proper location of the base end of the outermost boom 2. wire rope 18
A jib rotation device characterized by being provided with.

(Function) According to the above configuration, after the jib 6 is rotated using the rotation device of the jib to the extended position of the tip of the telescopic boom in the upright state, even if there is enough space to lower the telescopic boom 1, Even if the boom is not near the ground, the telescopic boom 1 can be freely extended and contracted by disconnecting the wire rope from the outermost boom base end at an appropriate position on the vehicle A, and uncoupling the rotation device of the outermost boom 2 and the jib. This is possible. Therefore, when attempting to attach the jib 6 to the extended position using the jib rotation device, the worker who has climbed into the building etc. simply operates the locking device 8 to keep the jib 6 in the extended position. That's enough.
In addition, when trying to rotate the jib 6 attached to the tip of the telescopic boom 1 as described above to the folding position using the jib rotation device with the telescopic boom 1 raised, use other than wire rope. The end is connected to the proximal end of the outermost boom 2 at a proper position, and then the telescopic boom 1 is telescopically adjusted so that the wire rope is somewhat loosened.
Then, a worker who has climbed up the building or the like removes the locking device 8 that keeps the jib 6 in the extended position, and then rotates the telescopic boom 1 by a small amount. This pivoting motion causes the jib 6 to pivot by a minute amount to a position where it continues to pivot in the folding direction about the pivot connection 7 due to its own weight. At this time, the wire rope restricts further rotation of the jib 6 in the folding direction. After doing this, the telescopic boom 1 is contracted and the jib 6 is brought to the folded position.

(Example) The jib rotation device of the present invention will be described below with reference to FIGS. 3 and 4.

The jib rotation device of the present invention is shown in Figures 1 and 2.
When compared with the jib rotation device shown in the figure and explained as the prior art, the only difference is that the connecting rod 16 in the conventional jib rotation device is replaced with a wire rope 18, which will be described later. Reference numerals A and 1 to 15 shown in the figures and FIG.

In FIGS. 3 and 4, reference numeral 18 connects one end to a pivot joint 15 that connects the other ends of the first and second links 12 and 14, and connects the other end to the outermost side of the telescopic boom 1. It is a wire rope 19 detachably connected to the base end of the boom 2 at an appropriate position.
The wire rope 18 is attached to the telescopic boom 1 with its base end connected to the base end of the outermost boom 2 at an appropriate position.
The jib 6 is designed so that it can rotate between the folded position (the position shown by the solid line in Figure 4) and the extended position (the position shown by the chain line in Figure 4) when the The length is set. Note that the first link 12, the second link 14, and the wire rope 18 constitute the jib rotation device of the present invention.

With the jib rotation device configured as described above, in order to extend the jib 6 to the extended position at the tip of the telescopic boom 1 in a narrow space, the telescopic boom 1 is held by being inverted to one side of the outermost boom 2. One side of the proximal end of the jib 6 is pivotally connected 7 to one side of the distal end of the innermost boom 4. Next, the jib 6 is released from the outermost boom 2, and the second
One end of the link 14 is pivotally connected to the base end of the jib 6, and the other end of the wire rope 18 is connected 19 to an appropriate position at the base end of the outermost boom 2 (as shown by solid lines in FIG. 4). Next, after raising the telescopic boom 1, the telescopic boom 1 is driven to extend. At this time, the extension motion of the telescopic boom 1 is converted by the jib rotation device into a rotational force that rotates and extends the jib 6, bringing the jib 6 to the extended position (as shown by the chain double-dashed line in FIGS. 3 and 4). situation). In this way, the jib 6 is attached to the telescopic boom 1.
After the tip of the jib 6 has been rotated to the extended position, a worker who has climbed onto a building etc. locks the locking device 8 that keeps the jib 6 in the extended position, and at the same time, a worker on the vehicle A locks the other end of the wire rope 18 and The base end of the outermost boom 2 is uncoupled at the appropriate location. Thus jib 6
Crane work is done at the tip. Furthermore, jib 6
When working with a crane at the tip, wire rope 1
8 is suspended from the pivot connection 15 that connects the other ends of the first and second links 12 and 14, but this does not interfere with crane work at the tip of the jib 6.

To store the jib 6 in an inverted folded manner from the extended position at the tip of the telescopic boom 1 to one side of the outermost boom 2 of the telescopic boom 1, a worker on the vehicle
Connect the other end of 8 to the base end of the outermost boom 2 at the appropriate location 19
Then, the locking device 8 that locks the jib 16 in the extended position is released. After adjusting the telescopic boom so that the wire rope 18 is slightly slack, the telescopic boom 1 is rotated by a minute amount or by an impact. Due to this rotational movement and the inertial force of the jib 6, the jib 6 rotates slightly in the folding direction about the pivot connection 7, and further rotation in the folding direction is restricted by the jib rotation device. At this time, the wire rope 18 prevents the jib 6 from rotating. Next, the telescopic boom 1 is retracted to rotate the jib 6 in the folding direction by its own weight. Jib 6
After folding, the telescopic boom 1 is laid down, and the pivot connection 13 between one end of the second link 14 and the proximal end of the jib 6 is released, and the other end of the wire rope 18 is connected to the outermost side. Release the connection 19 at the proper position at the base end of the boom 2, connect the jib 6 in the inverted and folded state to the outermost boom 2, and connect the pivot connection between one side of the tip of the most advanced boom 4 and one side of the base end of the jib 6. It is canceled. Crane work is done at the tip of the telescopic boom.

Also, when folding the jib 6 around the pivot connection 7,
In the above embodiment, the rotation is caused by the rotational movement and the inertial force of the jib 6, but by connecting the sub-hook 9 to an object on the ground, tensioning the sub-wire to the extent that it does not loosen, and causing the rotational movement, The jib 6 may be slightly rotated about the pivot connection 7 in the folding direction. At this time, the wire rope 18
Further rotation in the folding direction is restricted by the rotation device of the jib. At that time, the sub wire is loosened, the sub hook 9 is disconnected from the object on the ground, the telescopic boom 1 is retracted, and the jib 6 is rotated in the folding direction. In addition, at this time, the first
The jib rotation device consisting of the link 12, the second link 14, and the wire rope 18 is connected to the pivot connection 1.
1 can be removed from the telescopic boom 1, or the first and second links 12 and 13 can be folded as shown by the dashed line in Fig. 4 and left attached to the most advanced boom 4, and the wire Only the rope 18 may be removed.

In the above embodiment, the wire rope 18
has one end connected to the pivot connection 15,
One end of this wire rope 18 is connected to the first or second
It goes without saying that the links 12 and 14 may be connected at appropriate positions.

(Effect of the invention) The jib rotation device of the present invention, which operates as described above, can connect and release the other end of the wire rope 18 from above the vehicle A to the outermost boom 2, and is capable of connecting and disconnecting the other end of the wire rope 18 from above the vehicle A to the outermost boom 2. This has an excellent effect in that the jib can be safely attached and detached in a narrow space because workers do not have to operate heavy objects at high places such as equipment.

[Brief explanation of the drawing]

Figure 1 is a side view of a mobile crane equipped with a conventional jib rotating device, Figure 2 is an enlarged plan view of the tip of the telescopic boom in Figure 1, and Figure 3 is a rotating jib according to the present invention. FIG. 4 is an enlarged plan view of the tip of the telescopic boom in FIG. 3. Telescopic boom...1, Innermost boom...4, Pivot connection...7, Locking device...8, Jib...6, Jib rotation device...10, First link...12, Second
Link...14, wire rope...18.

Claims (1)

[Scope of Claim for Utility Model Registration] One side of the proximal end of the jib 6 is pivotally connected 7 to one side of the tip of the innermost boom 4 of the telescopic boom 1, which is formed by telescopically fitting the inner boom into the outer boom one after another. The jib 6 can be rotated around this pivot joint 7 between an extended position extending from the tip of the telescopic boom 1 and a folded position in which it is inverted and folded along the side of the telescopic boom 1. A jib rotation device used in a telescopic boom/jib assembly, which is provided with a locking device 8 between the other end of the innermost boom 4 and the other side of the base end of the jib to keep the jib 6 in the extended position. A first link 12 whose one end is pivotally connected 11 to the tip of the innermost boom 4 of the telescopic boom 1, and a jib 6.
A second link 14 having one end pivotally connected to a proper position at the proximal end of the second link 14.
The other end sides of the first and second links are pivotally connected 15 to each other, and the pivotally connected portion 15 is the pivotally connected 11 between the first link 12 and the innermost boom 4.
When the jib 6 is rotated a predetermined amount toward the proximal end of the telescoping boom around its center, the jib 6 in the folded position is rotated to the extended position, and the jib 6 is moved to the appropriate position of the first or second link 12, 14. A wire rope 1 with one end connected and the other end removably connected to the proximal end of the outermost boom 2 of the telescopic boom 1
8. The length is set so that the first link 12 can rotate a predetermined amount within the extension/contraction range of the telescopic boom, especially when its base end is connected to the proper location of the base end of the outermost boom 2. wire rope 18
A jib rotation device characterized by being provided with.