JPH04133685U - Assembly of telescopic boom and jib - Google Patents

Abstract

(57) [Summary] [Purpose] Regarding an assembly of telescopic boom and jib that passes below the tip of the telescopic boom and rotates the telescopic jib between an extended position and a retracted position. Increase the amount of expansion and contraction of the jib. [Structure] The hook block 1b portion of the hook block 1 is pulled up using the extension force of the telescoping boom 2, and the hook block passage space 6 between the left and right legs 5a, 5b of the jib can be reduced, thereby creating a telescoping jib. Increased the amount of expansion and contraction.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a telescoping boom/jib assembly for a mobile crane.

0002

[Conventional technology]

The telescopic boom/jib assembly of a mobile crane has a sheave as shown in Figures 2 and 3. Block 1a and hacker 1b attached to this sheave block 1a so as to be swingable. A hook block 1 consisting of a telescopic boom 2 with protruding connection points 3 and 4 on the left and right positions of the tip 2a; , the left and right legs of the proximal end of the telescopic boom 2 are connected to the connection points 3 and 4 of the distal end 2a of the telescopic boom 2. Use position where 5a and 5b are connected detachably and protrude from the tip of the telescopic boom. (solid line position in Figure 2) and folding position along the telescopic boom (imaginary line position in Figure 2) and a telescoping jib 5 configured to be able to rotate around the connection points 3 and 4 between the has been completed. Then, the left and right legs 5a and 5b of the telescopic jib 5 are attached to a telescopic boom. The telescopic jib 5 is connected to the connection points 3 and 4 of the tip 2a of the When the hook block 1 rotates between the It passes through the hook block passage space 6 between b.

0003 In this example, the telescoping boom is disposed within the proximal-most boom section 7 in sequence. It consists of a three-stage telescopic boom into which boom sections 8 and 9 are telescopically inserted. Ru. In this case, the tip of the telescopic boom 2 is the tip of the boom section 9 on the most distal side. It is located in The telescoping jib 5 is placed in the folded position when not in use, and then folded from the tip end 2a. At the same time as removing it, attach it to the boom section 7 at the proximal end of the telescopic boom 2 and store it. It is now being delivered. Furthermore, the telescopic jib 5 includes a jib section 10 on the proximal end side and a jib section 10 on the proximal end side. A two-stage telescopic type consisting of a tip side jib section 11 that is telescopically inserted into the It is composed of Telescoping boom-jib assemblies of this type are already known.

0004 By the way, the hook block passing air in this type of telescopic boom/jib assembly is In the above-mentioned conventional telescopic boom/jib assembly, the gap 6 is the hook block 1. When fully hoisted, it is freely suspended from the lower end of the sheave block 1a. The telescopic jib 5 needs to be large enough for the hacker 1b to pass through. The proximal side jib section 10 and the distal side jib section 11 at the maximum contraction Since the amount of overlap is reduced, the problem that the amount of expansion and contraction of the jib 5 is reduced accordingly is solved. there were.

[0005]

[Problem that the idea aims to solve]

This invention solves the problems of the conventional telescopic boom/jib assembly mentioned above. , to provide a small telescopic boom/jib assembly with a hook block passage space 6. The purpose is to

[0006]

[Means to solve the problem]

In order to achieve the above purpose, the telescopic boom/jib assembly of the present invention is different from the conventional telescopic boom/jib assembly. It is constructed by adding the following configuration to a collection of retracting booms and jibs. In other words, the boom section 7 of the telescopic boom 2 is located on the distal end side of the boom section 7 on the proximal end side. Attach a rope guide to the tip of the boom section 8 or 9 to be placed. Then, after passing the guide tool through the middle part, insert the boot to which the guide tool is attached. A suitable place on the boom section 7 or 8 on the proximal side of the boom section and the hacker 1 It was constructed by providing a rope that could be hung between the

[0007]

[Effect]

The telescopic boom/jib assembly of the present invention constructed as described above is the left side of the telescopic jib 5. The right legs 5a, 5b are connected to the connecting points 3, 4 of the tip 2a of the telescopic boom 2, and the telescopic boom 2 is extended and retracted. When rotating the type jib 5 between the use position and the folded position, the middle part of the rope pass through the guide device, and then attach the rope to the boom section to which the guide device is attached. Place the boom section in the right place on the proximal side of the hook and hook block 1 hoisted up to its maximum. by hanging it between the hackers 1b and then slightly extending the telescopic boom. The hacker 1b, which is swingably attached to the cable block 1a, is held by the rope. Since it can be lifted up, only the amount that corresponds to this lifting amount will pass through the hook block. This allows the size of the space 6 to be reduced.

[0008]

【Example】

An embodiment of the telescopic boom/jib assembly of the present invention will be described below with reference to FIG. The telescopic boom/jib assembly of the present invention is different from the conventional one shown in Figs. 2 and 3 and described above. Since some configurations have been added, the symbols and configurations explained in the above conventional technology are It will be used as is in the explanation below.

[0009] In FIG. 1, 12 is the proximal boom section 7 of the telescopic boom 2. The tip of the boom section located on the tip side (in this example, on the tip side) This is a rope guide attached to the tip of the boom section 9. 13 is larger than the boom section 9 to which the rope guide 12 is attached. Boom section 8 (of course, it may also be boom section 7) located on the proximal end side ) is the rope connecting part attached to the tip of the rope. 14 has a mint 1b on its tip. It has an annular portion 14a that can be engaged with the rope connecting portion 13 at its base end. The rope has a ring-shaped portion 14b.

0010 Next, the effect will be explained. The left and right legs 5a and 5b of the telescoping jib 5 are connected to the connection point 3 of the tip 2a of the telescoping boom 2. , 4 to rotate the telescopic jib 5 between the use position and the folding position. First, hoist the hook block 1 to the maximum and lower the telescopic boom 2. . Next, the annular portion 14a at the tip of the rope 14 is engaged with the peppermint 1a, and After passing the rope 14 around the guide tool 12, the annular portion 14b at the base end of the rope 14 is inserted. is engaged with the rope connecting portion 13. Next, raise the telescopic boom 2 and A space is secured below the tip 2a of the arm 2 in which the jib 5 can rotate. I did it like this At the top, the telescopic boom 2 is extended and the mint 1b is pulled up by the rope 14. In this state, the mint 1b is raised from a freely suspended state with respect to the sheave block 1a. Since it is bent in the direction, the lower end position of the peppermint 1b is reduced compared to the conventional case. do. In this way, the telescopic jib 5 can be rotated between the extended position and the folded position. That's what I do.

[0011] In this case, compared to the conventional one, the lower end position of the pepper 1b is Since the hook block passing space 6 of the jib 5 is increased by that amount, the size of the hook block passage space 6 of the jib 5 is reduced accordingly. It is possible to reduce it. Therefore, the telescopic boom/jib assembly of the present invention According to the above, it is possible to equip a telescopic jib with a larger amount of expansion and contraction than conventional ones. It is.

0012

[Effect of the idea]

The telescopic boom/jib assembly of the present invention constructed and operated as described above is different from the conventional telescopic boom/jib assembly. By simply adding a simple configuration to the boom/jib assembly, you can increase the amount of expansion and contraction of the telescopic jib. It is possible to achieve the excellent effect of being able to listen.

[Brief explanation of drawings]

FIG. 1 is an explanatory side view of the telescopic boom/jib assembly of the present invention.

FIG. 2 is an explanatory side view of a conventional telescopic boom/jib assembly.

FIG. 3 is a plan view of a conventional telescoping jib.

[Explanation of symbols]

1 hook block 1a Sheave block 1b Mentha 2 Telescopic boom 2a Tip 3,4 Connection point 5 Telescopic jib 5a, 5b Legs 6 Hook block passage space 7, 8, 9 Boom section 10,11 Jib section 12 Guide tool 14 Rope

Claims (1)

[Scope of utility model registration request] Claim 1: A hook block consisting of a sheave block and a hacker attached to the sheave block so as to be swingable, is suspended from the tip of the hook block so as to be able to be rolled up and lowered, and the connections are protruded from the left and right positions of the tip. A telescopic boom is provided with a point, and the right and left legs of the proximal end are removably connected to the connection point at the tip of the telescopic boom, and the use position protrudes from the tip of the telescopic boom and the position along the telescopic boom is provided. A telescopic boom/jib assembly consisting of a telescopic jib configured to be able to rotate around the connecting point between the folded position and the folded position, in particular, the left and right legs of the jib are connected to the connecting point of the tip of the telescopic boom. When the telescopic jib is rotated between the use position and the folded position by connecting to the telescopic boom, the hook block passes through the hook block passage space between the legs of the jib, A rope guide is attached to the tip of the boom section located on the tip side of the boom section on the end side, and the rope guide is attached to the middle part of the boom section, which is located at the tip end of the boom section, and the middle section is attached to the end of the boom section. A telescopic boom/jib assembly comprising a rope that can be hung between a proper position of an end boom section and the hacker.