JPH11263586A - Jig angle changing device of auxiliary jib - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device capable of easily changing the jib angle of an auxiliary jib. SOLUTION: One end of a auxiliary jib supporting rope 22 is connected to the extreme end part 18 of the auxiliary jib 13 connected to the extreme end part 11 of a jib 10, the other end of the auxiliary jib supporting rope 22 is connected to a link member 16 fitted to the extreme end part 11 of the jib 10, and hence the auxiliary jib 13 is supported. The link member 16 is formed with a plurality of connecting holes 16a, 16b, the other end of the auxiliary jib supporting rope 22 is selectively rearrangedly connected either of the connecting holes 16a, 16b, and hence the jib angle of the auxiliary jib 13 is changed, further, the crane working range by the auxiliary jib 13 is changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jib angle changing device for an auxiliary jib which adjusts a crane working range of the auxiliary jib by changing the jib angle of the auxiliary jib.

[0002]

2. Description of the Related Art FIG. 5 shows the structure of a conventional jib angle changing device provided with an auxiliary jib. In the figure, an auxiliary jib 1 is swingably connected to a distal end 3 of a jib 2, and further, an auxiliary jib support rope 5 bridged between a distal end 3 of the jib 2 and a distal end 4 of the auxiliary jib 1. Is supported by
A hoisting rope 9 provided with a hanger 8 is provided on sheaves 6 and 7 provided at the distal ends 3 and 4 of the jib 2 and the auxiliary jib 1.

In the structure of such a jib angle changing device,
In order to change the working range of the crane on the auxiliary jib 1 such as the working radius and the working head of the auxiliary jib 1, the auxiliary jib 1 is replaced with an auxiliary jib supporting rope 5 having a different length, By connecting and linking link members (not shown) having different lengths between
The jib angle θ of the auxiliary jib 1 with respect to the longitudinal direction was changed.

[0004]

However, in the above-mentioned conventional jib angle changing device, in order to change the crane working range of the auxiliary jib, a plurality of auxiliary jib having different lengths according to the jib angle of the auxiliary jib are required. There is a problem that it is necessary to prepare supporting ropes and link members in advance,
The work of assembling the auxiliary jib support ropes and the link members is complicated and takes a long time, so that there is a problem that workability is poor.

SUMMARY OF THE INVENTION The present invention has been made to overcome the problems of the prior art, and has as its object to provide a jib angle changing device for an auxiliary jib having excellent workability and the like.

[0006]

In order to achieve the above object, the present invention uses an auxiliary jib support rope having one end connected to an auxiliary jib to change the jib angle of the auxiliary jib supported by the jib. A jib angle changing device for an auxiliary jib, comprising a link member attached to one end of the jib and formed with a plurality of connection holes for selectively rearranging and connecting the other end of the auxiliary jib support rope. did.

According to this structure, when the other end of the auxiliary jib support rope is selectively rearranged and connected to the plurality of connection holes formed in the link member, one end of the jib to which the link member is attached and the auxiliary jib are connected to the auxiliary jib. Changing the distance between one end of the connected auxiliary jib support rope changes the jib angle of the auxiliary jib, and changing the jib angle changes the crane working range of the auxiliary jib.

An auxiliary jib angle changing device for changing a jib angle of an auxiliary jib supported by the jib using an auxiliary jib support rope having one end connected to the jib. And a link member formed with a plurality of connection holes for selectively rearranging and connecting the other end of the auxiliary jib support rope.

According to this structure, when the other end of the auxiliary jib support rope is selectively rearranged and connected to the plurality of connection holes formed in the link member, one end of the auxiliary jib to which the link member is attached and the jib are connected to the auxiliary jib. Changing the distance between one end of the connected auxiliary jib support rope changes the jib angle of the auxiliary jib, and changing the jib angle changes the crane working range of the auxiliary jib.

An auxiliary jib angle changing device for changing the jib angle of the auxiliary jib supported by the jib by using an auxiliary jib support rope, wherein the jib angle changing device is attached to one end of the auxiliary jib and supports the auxiliary jib. A first link member having a plurality of connection holes for selectively rearranging and connecting one end of the rope; and a first link member attached to one end of the jib and selectively rearranging and connecting the other end of the auxiliary jib support rope. And a second link member having a plurality of connection holes.

According to this structure, one end of the auxiliary jib support rope is selectively rearranged and connected to the plurality of connection holes formed in the first link member, or the other end of the auxiliary jib support rope is connected to the second link member. When selectively rearranged and connected to the plurality of connection holes formed in the link member, a position between one end of the auxiliary jib to which the first link member is attached and one end of the jib to which the second link member is attached is set. By changing the distance, the jib angle of the auxiliary jib changes, and by changing the jib angle, the working range of the crane on the auxiliary jib can be changed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the jib angle changing device for an auxiliary jib according to the present invention is applied to a mobile crane will be described below with reference to FIGS.
FIG. 1 is a side view showing the structure of the jib angle changing device according to the present embodiment, and FIGS. 2 to 4 are explanatory views showing the main structure of the jib angle changing device according to the present embodiment. .

In FIG. 1, a jib 10 is supported on an upper revolving structure (not shown) of a mobile crane so as to be able to move up and down. It has become.

An auxiliary jib 13 is swingably connected to a distal end portion 11 of the jib 10 by a connecting pin 14, and further, is swingable by a connecting pin 15 to a portion spaced from the connecting position of the auxiliary jib 13 by a fixed pin. Link member 16 supported by
And a sheave 17 are attached.

The sheave 1 is attached to the tip 18 of the auxiliary jib 13.
9 and a connecting member 21 that is swingably supported by a connecting pin 20. An auxiliary jib support rope 22 is hung between the connecting member 21 and the link member 16, and an auxiliary hoisting rope 24 provided with a hanger 23 is provided between the sheaves 17 and 19.

Further, in FIGS. 2 and 3, the link member 16 is provided with a plurality (two in this embodiment) for connecting a connecting member 22a fixed to the tip of the auxiliary jib support rope 22 by a pin connection. The connection holes 16a and 16b are drilled, and these connection holes 16a and 16b are located in different radial directions with the coupling pin 15 as a center and separated by different distances L1 and L2. Has been drilled.

As shown in the sectional view of FIG. 4, a connecting hole 22b is formed in a connecting member 22a fixed to the auxiliary jib support rope 22, and the connecting hole 22b and the connecting hole 16a of the link member 16 are formed. Or match 16b
By fixing with the connecting pin 25, the auxiliary jib support rope 22 can be replaced with the connecting hole 16a or 16b.

In such a structure, as shown in FIG.
When the connecting member 22a fixed to the auxiliary jib support rope 22 is replaced with the connecting hole 16a of the link member 16, the length of the connecting member
The auxiliary jib 13 is inclined at the jib angle shown in FIG. 1A according to the total length obtained by adding the distance L1 from 5 to the connection hole 16a. As shown in FIG. 3, a connecting member 22 called a socket fixed to the auxiliary jib support rope 22.
When a is rearranged to the connecting hole 16b of the link member 16, the auxiliary jib is formed in accordance with the total length obtained by adding the distance L2 from the connecting pin 15 to the connecting hole 16b to the length of the connecting member 21 and the auxiliary jib support rope 22. 13 inclines at the jib angle shown in FIG.

The distances L1 and L2 satisfy L1> L.
2, the above jib angle (A)
(B) has different angles from each other, and the working range of the crane on the auxiliary jib 13 such as the working radius and the working head of the auxiliary jib 13 is changed according to the respective jib angles (A) and (B).

As described above, according to the present embodiment, the link member 16 having the plurality of connecting holes 16a and 16b is attached to the distal end portion 11 of the jib 10, and one end of the link member 16 is connected to the auxiliary jib 13. Connect the other end of the rope 22 to each connection hole 1
Since the jib angle of the auxiliary jib 13 is changed only by selectively reassembling and connecting to one of the auxiliary jib 13a and 16b, the working range of the crane at the auxiliary jib 13 can be shortened without using any special parts. It can be changed in time and easily.

That is, as in the prior art, the auxiliary jib 13
It is not necessary to prepare a plurality of auxiliary jib support ropes and link members having different lengths according to the jib angle.

The connecting holes 16a, 1 of the link member 16
6b are drilled in different radial directions around the connecting pin 15 and at different distances L1 and L2, respectively, so that the connecting hole of the connecting member 22a fixed to the auxiliary jib support rope 22 is formed. 22b to the connection hole 16a
Or, when fixing to the connecting pin 25 in accordance with 16b,
This prevents a problem that the connection member 22a cannot be connected due to the outer end of the link member 16 hitting the forked crotch portion of the connection member 22a.

That is, if the connecting holes 16a and 16b are formed in a line in the same radial direction with the connecting pin 15 as the center, the connecting hole 16a provided at a position farther from the connecting pin 15 is provided with the connecting member 22a. The connection hole 22b of the connection member 22a can be aligned with the connection hole 16b provided at a position closer to the connection pin 15.
If b is to be matched, the outer end of the link member 16 will hit the forked crotch portion of the connecting member 22a, and the connection will be impossible. On the other hand, in the present embodiment, since the connection holes 16a and 16b are formed at the above positions, such a problem can be prevented from occurring.

In this embodiment, the link member 16
Although the case where two connecting holes 16a and 16b are provided has been described, three or more connecting holes may be formed, and the auxiliary jib support rope 22 may be selectively rearranged in these holes.

Although the case where the link member 16 is provided at the distal end portion 11 of the jib 10 has been described, the link member 16 is provided at the distal end portion 18 side of the auxiliary jib 13 and the link member 1 is provided.
An auxiliary jib support rope 22 may be connected between the jib 6 and the tip 11 of the jib 10.

The tip 11 of the jib 10 and the auxiliary jib 1
The link members 16 may be provided at both of the distal end portions 18 of the third member 3, and the auxiliary jib support rope 22 may be connected between the link members 16 provided at both of them.

[0027]

As described above, according to the present invention, a link member having a plurality of connection holes is attached to at least one of the jib and the auxiliary jib, and the link member is provided between the link member and the jib or between the link member and the jib. The jib angle of the auxiliary jib is changed by connecting the auxiliary jib support rope to any of the connection holes between the jib and the link member, so the crane working range with the auxiliary jib is special. It is possible to easily change the auxiliary jib in a short time without using a simple part, and to realize an auxiliary jib changing device for an auxiliary jib having a simple configuration.

[Brief description of the drawings]

FIG. 1 is a side view showing the structure of a jib angle changing device according to the present embodiment.

FIG. 2 is a side view showing a main structure of the jib angle changing device according to the present embodiment.

FIG. 3 is an explanatory diagram further illustrating a main structure of the jib angle changing device according to the embodiment;

FIG. 4 is a partially broken cross-sectional view of the jib angle changing device according to the present embodiment.

FIG. 5 is a side view showing a structure of a conventional jib angle changing device.

[Explanation of symbols]

 Reference Signs List 10 jib 13 auxiliary jib 16 link member 16a, 16b, 22b connection hole 22 auxiliary jib support rope 22a connection member

Claims (6)

[Claims] An auxiliary jib angle changing device for changing a jib angle of the auxiliary jib supported by the jib by using an auxiliary jib support rope having one end connected to the auxiliary jib, wherein one end of the jib is provided. A jib angle changing device for an auxiliary jib, wherein the link member is provided with a plurality of connection holes for selectively rearranging and connecting the other end of the auxiliary jib support rope. 2. An auxiliary jib angle changing device for changing a jib angle of an auxiliary jib supported by said jib by using an auxiliary jib support rope having one end connected to said jib. A jib angle changing device for an auxiliary jib, wherein the link member is provided with a plurality of connection holes for selectively rearranging and connecting the other end of the auxiliary jib support rope. 3. An auxiliary jib angle changing device for changing the jib angle of an auxiliary jib supported by a jib using an auxiliary jib support rope, the jib angle changing device being attached to one end of the auxiliary jib and supporting the auxiliary jib. A first link member having a plurality of connection holes for selectively rearranging and connecting one end of the rope; and a first link member attached to one end of the jib and selectively rearranging and connecting the other end of the auxiliary jib support rope. A jib angle changing device for an auxiliary jib, comprising: a second link member having a plurality of connection holes. 4. The plurality of connection holes formed in the link member at different radial directions and at different distances from the mounting position of the link member, respectively, and wherein the plurality of connection holes are formed in the link member. The jib angle changing device for the auxiliary jib according to claim 1 or 2, wherein a connecting member having a connecting hole corresponding to each of the auxiliary jib is fixed to the other end of the auxiliary jib support rope. . 5. The plurality of connecting holes formed in the link member at different radial directions and at different distances from the mounting position of the link member, respectively, and wherein the plurality of connecting holes are formed in the link member. 4. The jib angle changing device for an auxiliary jib according to claim 3, wherein connection members having connection holes corresponding to the above are fixed to one end and the other end of the auxiliary jib support rope. 6. The jib angle changing device for an auxiliary jib according to claim 1, wherein the jib angle changing device for the auxiliary jib is provided in a mobile crane.