JP2516883Y2 - Hook block storage device for mobile crane with bending boom - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook block storage device for a mobile crane having a folding boom.

[0002]

2. Description of the Related Art As shown in FIGS. 2 and 3, a mobile crane having a folding boom includes a first boom 3 which is mounted on a swivel base 2 which is disposed on a traveling body 1 so as to be capable of swinging, and a first boom 3 which is capable of swinging. The second boom 4 attached to the tip of the first boom 3 and freely bendable and extendable between the folding position and the extended position along the first boom is provided. A hook block 7 is suspended from the tip of the second boom 4 by a wire rope 6 pulled out via the tip of the first boom 3 and the tip of the second boom 4. Reference numeral 9 is an up-and-down fulcrum pin of the first boom 3.

In a mobile crane having a folding boom of this type, the second boom 4 is set to the folding position and then the first boom 3 is laid down along the traveling direction of the traveling body 1 to store the folding boom (Fig. (3 state) and travels. When traveling, the hook block 7 suspended from the tip of the second boom 4 is stored in the hook block storing means 8 arranged on the swivel base 2, and the wire rope 6 is appropriately tensioned. At this time, the hook block 7 is prevented from swinging.

In a conventional hook block storage device having a folding boom, in which the storage device for the hook block 7 is constituted only by the hook block storage means 8 as described above, in the storage state of the hook block 7, the second storage device is used. The wire rope 6 from the tip of the boom 4 directly connects to the swivel base 2.
Since it reaches the hook block 7 attached to the side, the first
When the boom 3 is raised and raised, the distance between the tip of the second boom 4 and the hook block 7 changes greatly. For this reason, in the conventional case, when raising and lowering the first boom 3 from the folded boom retracted state, there is a problem in that the operation of lowering the winch 5 must be used together. If this combined operation was forgotten, there was a risk of cutting the wire rope 6.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems of the prior art, and to avoid lowering the winch 5 when raising the first boom 3 from the retracted state of the folding boom. Another object is to provide a novel hook block storage device.

[0006]

To achieve the above object, a hook block storage device for a mobile crane having a folding boom according to the present invention is constructed as follows. A first boom 3 which is mounted on a swivel base 2 which is arranged on the traveling body 1 so as to be swivel-driving, and which is swung up and down. A folding position along the first boom 3 which is mounted on a tip end of the first boom 3 and an extended extension. The second boom 4 that can flexibly drive between its position
And a hook block at the tip of the second boom 4 with a wire rope 6 pulled out from the winch 5 arranged on the first boom 3 via the tip of the first boom 3 and the tip of the second boom 4. A hook block storage device for a mobile crane having a bending boom in which the hook 7 is suspended, the hook block being located at a position on the swivel base 2 lower than the position of the undulating fulcrum pin 9 of the first boom 3 with respect to the swivel base 2. While installing the storage means 8, at the base end of the first boom 3,
A releasable folding tool for folding back the wire rope 6 between the tip portion of the second boom 4 and the hook block 7 is arranged, and the folding tool is the hook block storing means 8 described above.
The virtual line connecting the hook block 7 stored in the first boom 3 to the hoisting fulcrum pin 9 of the first boom 3 crosses the midpoint of the movement locus of the folding tool when the first boom 3 is hoisted.
A hook block storage device for a mobile crane having a folding boom, which is arranged at the base end of the boom 3.

[0007]

According to the above construction, in the retracted state of the hook block 7, the wire boom 6 between the tip portion of the second boom 4 and the hook block 7 stored in the hook block storing means 8 is moved to the first boom. 3 is engaged with a folding tool provided at the base end of the hook 3, and an imaginary line connecting the hook block 7 stored in the hook block storing means 8 and the undulating fulcrum pin 9 of the first boom 3 is formed. Since the first boom 3 is arranged at the base end portion of the first boom 3 so as to cross the midpoint of the movement path of the folding tool when the first boom 3 is driven up and down, the first boom 3 is raised from the folded boom retracted state. When operated, the wire rope 6 loosens in the first half of raising the first boom 3, and in the latter half of raising the wire rope 6 is approximately equal to the amount of loosening in the first half of raising, which is smaller by the difference in the winding angle of the folding tool. Since only tension is the result of need to perform lowering operations winch 5 is eliminated as.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hook block storage device for a mobile crane having a folding boom according to the present invention will be described below with reference to FIG. The hook block storage device of the mobile crane having the folding boom of the present invention is stored in the tip portion of the second boom 4 and the hook block storage means 8 in the stored state of the hook block 7 as compared with the conventional hook block storage device. The only difference is that a folding tool for engaging the wire rope 6 between the hook blocks 7 is added, and the other reference numerals, configurations, and functions are those shown in FIGS. 2 to 3 and described above. Will be incorporated in the following description.

In FIG. 1, reference numeral 8 denotes a swivel base 2 which is lower than the position of the undulating fulcrum pin 9 of the first boom 3 with respect to the swivel base 2.
It is the hook block storing means 8 attached to the upper position. Reference numeral 10 is a detachable folding tool that is provided at the base end of the first boom 3 and that folds back the wire rope 6 between the tip of the second boom 4 and the hook block 7, and the folding tool 10 includes: An imaginary line P connecting the hook block 7 stored in the hook block storage means 8 and the undulating fulcrum pin 9 of the first boom 3 crosses the midpoint of the movement locus Q of the folding tool when the first boom 3 is driven up and down. It is arranged at the base end of the first boom 3.

Next, the operation will be described. In the folded boom storage state, the hook block 7 is stored in the hook block storage means 8, and then the folding tool 10 is provided in the middle of the wire rope 6 between the tip portion of the second boom 4 and the hook block 7.
And then operate the winch 5 to operate the wire rope 6
Strain (state shown by the solid line in FIG. 1). When the first boom 3 is raised from the folded boom retracted state,
In the first half of raising until the folding tool 10 comes to the line of the imaginary line P, since the tensioning distance of the wire rope 6 between the tip part of the second boom 4 and the hook block 7 via the folding tool 10 becomes short, The wire rope 6 loosens. In the latter half of raising, the wire rope 6 is stretched by a long distance between the tip of the second boom 4 and the hook block 7 via the folding tool 10, and the wire rope 6 tries to be tensioned. Covered by the looseness of the wire rope 6 that occurred in the first half of
The wrapping tool 10 becomes loose due to the difference in the winding angle. Therefore, prior to the crane work, when raising and lowering the first boom 3 from the folded boom retracted state, it is not necessary to operate the winch 5 together with the conventional hook block retractor.

[0011]

The hook block retracting device for a mobile crane having a folding boom of the present invention constructed as described above has an extremely simple construction and is capable of raising and lowering the first boom 3 from the folded boom retracted state. Therefore, it is not necessary to operate the winch 5 together with the conventional hook block storage device. Therefore, there is no risk of cutting the wire rope even if the winch operation is forgotten.

[Brief description of drawings]

FIG. 1 is an explanatory view of a hook block storage device according to the present invention.

FIG. 2 is an explanatory view of a mobile crane having a bending boom to which a conventional hook block storage device is attached, and is an explanatory view of a folded boom storage state.

FIG. 3 is an explanatory diagram of a mobile crane having a bending boom to which a conventional hook block storage device is attached, and is an explanatory diagram of a crane working state.

[Explanation of symbols]

1 traveling body 2 swivel base 3 first boom 4 second boom 5 winch 6 wire rope 7 hook block 8 hook block storing means 9 undulating fulcrum pin 10 folding tool P hook block 7 stored in the hook block storing means 8 and the first Virtual line connecting the undulating fulcrum pin 9 of the boom 3 Q The locus of movement of the folding tool 10 during undulating drive

Claims (1)

(57) [Scope of utility model registration request] Claim: What is claimed is: 1. A first boom, which is mounted on a swivel base, which is arranged so as to be swivel-driving on a traveling body, so as to be able to move up and down, a folding position along the first boom, which is mounted on a tip portion of the first boom, and an extended extension. Second flexion extension drive between position
It is equipped with a boom, and the winches from the first boom to the first
A hook block storage device for a mobile crane having a bending boom in which a hook block is hung on the tip of the second boom with a wire rope pulled out via the tip of the boom and the tip of the second boom. Then, the hook block storing means is attached to a position on the swivel lower than the position of the hoisting fulcrum pin of the first boom with respect to the swivel, and the tip end of the second boom and the hook block are attached to the base end of the first boom. A releasable fold-back tool for fold-back is arranged in the middle of the wire rope between the fold-back tools, and in this fold-back tool, an imaginary line connecting the hook block stored in the hook block storage means and the undulating fulcrum pin of the first boom is The bending block is arranged at the base end of the first boom so as to cross the midpoint of the movement trajectory of the folding tool when the boom is raised and lowered. A hook block storage device for a mobile crane having a boom.