JPH11106177A - Hoisting piece at arm tip for crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hoisting piece for a crane which is capable of hoisting a member up to the vicinity of a ceiling. SOLUTION: A bracket 11 is attached to a tip of a second arm 7 of a crane, and a guide 13 which is projected upward of an upper surface of a second arm 7 is provided on an upper part of its tip. A chain block 21 of a steel elevating/lowering means 20 is attached to a bracket 11, a chain 22 is wound around forward of the second arm 7 through the guide 13, and connected to a hoisting fitting 44 fixed to a back side of a holding plate 41 of a steel holding means 40. A steel 50 held by the steel holding means 40 is hoisted up to the vicinity of the guide 13, a lower part of the steel holding means 40 is positioned by an angle regulating means 30 to control the posture of the steel 50. The steel 50 can be hoisted thereby up to the vicinity of the ceiling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on an end of an arm which can be raised and lowered with respect to a base, and can easily and reliably hold a steel material or the like in a predetermined posture while suspending the steel material. The present invention relates to a hanging tool at the tip of a crane arm.

[0002]

2. Description of the Related Art Conventionally, as a hanging tool which is attached to the tip of an arm which can be raised and lowered with respect to a base and suspends a steel material or the like, there is one disclosed in Japanese Patent Publication No. 4-78559.

A truck crane disclosed in Japanese Patent Publication No. 4-78559 will be described with reference to FIG.
A pivot support member 73 is rotatably mounted on a vertical axis 74, and a base end of a pivoting arm 75 is pivotally mounted on the pivot support member 73 by a horizontal axis 76. A horizontally extending guide rail 77 is fixed to the turning support member 73, and a base end of an arm upward tilt support leg 78 is attached to an intermediate portion of the turning elevation arm 75 so as to be foldable by a horizontal axis. A guide member guided by the guide rail 77 is provided at a distal end of the upwardly tilting support leg 78, and a chain block 80 is provided at a distal end of the revolving and lowering arm 75.
Is attached. "

That is, as a suspending tool, for example, an electric chain block 80 is normally suspended from the tip of the revolving and lowering arm 75, and the steel material 50 is suspended from the tip of the chain 81 to ascend and descend. Note that the steel member 50 is moved to a predetermined position by rotating the support member 72 and the turning support member 73 while the steel material 50 is suspended, and raising the turning / elevating arm 75.

[0005]

However, in the above prior art, the chain block 80 is normally hung from the tip of the revolving and elevating arm 75, and the steel material 50 is hung up and down from the tip of the chain 81. As shown in (2), the distance H from the upper end of the swivel arm 75 to the upper surface of the steel material 50 increases. For this reason, for example, in tunnel construction or construction work, it is impossible to carry in and install the steel material 50 at a position where the distance from the ceiling is smaller than H in a place where the ceiling is present. Also, when it is desired to install the steel material 50 accurately at a predetermined position, the position and posture of the steel material 50 are unstable because the steel material 50 is simply hung at the tip of the chain 81, and it is not easy to perform an accurate installation work.

SUMMARY OF THE INVENTION In view of the above problems, the present invention can transport a steel material or the like to a predetermined height near a ceiling even in a place where there is an obstacle above the ceiling or the like, and can easily perform accurate positioning. An object of the present invention is to provide an auxiliary hanging device that can be mounted on a crane arm tip at a low cost.

[0007]

Means for Solving the Problems, Functions and Effects In order to achieve the above object, a first embodiment of a crane arm suspension according to the present invention will be described with reference to FIG. (A) At the crane arm tip hanger which is attached to the tip of the arm 7 which can be raised and lowered with respect to the table 1 and which can suspend the steel material 50, (a) is attached to the tip of the arm 7 Bracket 11 and (b) bracket 11
A guide 13 provided above the tip of the wire 7 and projecting above the upper surface 7a of the arm 7;
(D) wire 2
2 is provided so that the steel material 50 held by the steel material holding means 40 can be lifted or lowered.

According to the first configuration, the steel material holding means 40
When the steel material 50 is lifted by the steel material lifting / lowering means 20 via the guide 13, the guide 13 protrudes from the upper surface 7 a of the arm 7, so that the steel material 50 rises almost to the upper end of the guide 13. it can. Therefore,
The distance from the upper end of the guide 13 to the upper surface of the steel material 50 can be substantially zero (= 0) or a position where the upper surface of the steel material 50 protrudes, and the steel material 50 is raised to a predetermined height near the ceiling and moved to the predetermined position. It can be installed, and the work of installing steel materials in a place with a ceiling or in a tunnel becomes easy. Incidentally, the steel material holding means 40 is obtained by welding a suspension fitting 44 to the back of a holding plate 41 having a holding groove 42 at one end as shown in FIG.
Alternatively, as shown in FIG. 7, the suspension fitting 44 is directly welded to the steel material 50, or as shown in FIG.
There are various means such as the one in which the steel 5 is fastened to the steel material 50. Moreover, both can be manufactured at low cost. The base 1 is fixed,
It can be either mobile or mobile.

Secondly, in the above-mentioned hanging tool at the tip of the first crane arm, the steel material lifting / lowering means 20 is a chain block 21.

According to the second configuration, the steel material elevating means 20
Is a chain block 21. For this reason, the wire 22
By unwinding (that is, the chain 22) along the guide 13, the steel material 50 can be freely moved up and down by being wound.
Further, since the steel material 50 is hung by the chain 22, there is a degree of freedom in movement, and the position and posture of the steel material 50 can be freely changed with a small force. When the steel material 50 is installed at a predetermined position, manual operation is required. Fine adjustment is possible, and work becomes easy. The chain block 21 is driven manually, for example, as shown in FIG. 2, using a hydraulic cylinder 26 shown in FIG. 4, or driven by a hydraulic motor 27 shown in FIG. 5, or driven by an electric motor. Various other things can be prepared. Further, as the steel material lifting / lowering means 20, besides the chain block 21, a winch suspended by a wire rope or the like may be used. In any case, the structure is simple and the cost can be reduced.

Thirdly, in the above-mentioned first or second crane arm hanging tool, the bracket 11 is provided with a steel material holding means when the steel material 50 is lifted up by the steel material elevating means 20 and the wire 22 is wound up to the maximum. It is characterized by having an angle adjusting means 30 for holding the steel material 50 held at 40 at a free angle.

According to the third configuration, the angle adjusting means 30
By adjusting the holding angle of the steel material 50 by the
The attitude of 0 can be determined in advance. For this reason, the work of accurately installing the steel material 50 at a predetermined location becomes easy.
11 and 12, the angle adjusting means 30 has one adjusting bolt and the steel material is rotatable in the horizontal direction. As shown in FIGS. 13 and 14, the angle adjusting means 30 has two adjusting bolts. Various kinds of preparations can be made, such as a method in which the horizontal posture is regulated, or a method in which three female screws for bolts are used and one or two adjustment bolts are selectively used by work, as shown in FIG.

[0013]

Embodiments and Examples of the Invention Hereinafter, examples will be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 1 is a side view of a small mobile crane 1 having a hanger 10. A first arm 5 is attached to an upper end of a column 3 supported by an outrigger 2 of the small mobile crane 1 by a pin 4 so as to be able to move up and down.
It comes to undulate. A second arm 7 is fitted inside the first arm 5 so as to be able to enter and exit from the tip of the first arm 5, and a hanging device 10 is attached to the tip of the second arm 7.

FIG. 2 is a side view of the hanging device 10, and FIG. 3 is a view taken in the direction of arrows AA in FIG. A bracket 11 having a pair of left and right L-shaped plates 11 b, 11 b is screwed to a distal end of the second arm 7 with bolts 12. The tip 11a of the bracket 11 is located on the upper surface 7a of the second arm 7.
From the front end 11a.
3 is attached. Therefore, the upper end of the guide 13 is the second
The arm 7 protrudes from the upper surface 7a. Although the illustrated guide 13 is a rotary roller, it may be a fixed guide such as a fixed pipe. A chain block 21 which is a steel material elevating means 20 is attached to the bracket 11. The chain block 21 is of a manual type, and its chain 22 is wound forward of the second arm 7 along the guide 13 and lowered. A link 24 is attached to the tip of the chain 22, and a steel material holding means 40 for holding a steel material 50 is provided.
Hanging bracket 4 fixed to the back of the holding plate 41
4 is connected by a pin 25. By operating the handle 23, the chain block 21
2 can be wound up and down freely. This is the front surface of the bracket 11 (that is, the left and right plates 11b, 11b).
At the lower part of the connecting plate 11c), an angle adjusting means 30 of a steel material 50 made of an adjusting bolt is screwed so that the mounting length S can be adjusted. The shape of the bracket 11 may be an irregular shape other than the L shape, such as a trapezoid.

FIG. 4 is a side view of a hanging device 10a according to a second embodiment of the hanging device 10. As shown in FIG. In place of the bracket 11, a bracket 14 having an upper opening and formed in a substantially U-shape is fixedly provided at the distal end of the second arm 7, and a guide 13 is attached to the upper end of the upper end thereof. Intermediate guide 15
Is attached. A hydraulic cylinder 26 is mounted on the upper surface 7a of the second arm 7, and a chain 22 connected to the tip of the hydraulic cylinder 26 hangs from the front of the second arm 7 via the intermediate guide 15 and the guide 13 in this order. The chain 22 is wound up by expanding and contracting the hydraulic cylinder 26,
It is possible to unwind freely.

FIG. 5 is a rear view of a steel material elevating means 20a according to a second embodiment of the steel material elevating means 20. The chain block 21 attached to the bracket 11 is of a hydraulic drive type instead of the manual type described above. Therefore, a hydraulic drive motor 27 is attached to the chain block 21 and receives and rotates pressure oil from a hydraulic source (not shown). Note that an electric motor may be used instead of the hydraulic drive motor 27.

FIG. 6 is a perspective view of the steel material holding means 40.
One end of the holding plate 41 has a holding groove 42 for holding the steel material 50, and one end of the steel material 50 is inserted into the holding groove 42 and screwed with a bolt 43. A U-shaped hanging bracket 44 is welded to the back surface of the holding plate 41. The hanging bracket 44 is connected to the link 24 attached to the end of the chain 22 by a pin 25.

FIG. 7 is a drawing of a steel material holding means 40a as a second embodiment of the steel material holding means 40, in which a suspending fitting 44 connected to the link 24 at the end of the chain 22 is directly welded to the steel material 50.

FIG. 8 is a drawing of a steel material holding means 40b according to a third embodiment of the steel material holding means 40. An eye bolt 45 connected to the link 24 at the end of the chain 22 is connected to a steel material 50.
It is screwed directly to.

Next, the work of lifting the steel material 50 will be described.
First, as shown in FIG. 9, the first arm 5 shown by the thin two-dot chain line in FIG. 21 is connected to the link 24 at the tip of the chain 22 using a pin 25, and the chain block 21
To raise the steel material 50 to the vicinity of the guide 13.

Next, when the first arm 5 is raised, FIG.
As shown in the figure, the back surface of the holding plate 41 of the steel material holding means 40 is in contact with the angle adjusting means 30, and the angle K about the longitudinal axis X of the steel material 50 (for example, the lower edge of the steel material 50 with respect to the vertical line Y-Y). Is defined. That is, in order to accurately install the steel material 50 at a predetermined position, the steel material 50 can be held in a necessary posture in advance. This angle K is 50
Can be changed by changing the mounting length S of the angle adjusting means 30 for each installation position of (i.e., for each undulation angle of the first and second arms 5, 7). At this time, the upper end of the steel material 50 and the tip 11a of the bracket 11 are substantially the same or
0 is the position where the upper end protrudes.

The angle adjusting means 30 will be described below with reference to FIGS.
This will be described with reference to FIG. 11 and 12 show a first embodiment of the angle adjusting means 30. FIG. 11 is a front view, and FIG. 12 is a plan view. Connecting plate 1 on front of bracket 11
Angle adjusting means 3 consisting of an adjusting bolt is provided at the lower center of 1c.
0 is attached. As described above, the steel material 50
The chain 22 is suspended from the tip of the chain 22 via a link 24 and a pin 25. For this reason, the steel member 50 has a degree of freedom for movement, and can be tilted as viewed from the front in the direction of arrow B shown in FIG.
(Left and right). Further, it is swingable in the direction of arrow D shown in the plan view of FIG. 12 with the tip of the angle adjusting means 30 as a fulcrum. These movements can be performed by hand, and fine positioning of the steel material 50 can be easily performed.

FIGS. 13 and 14 show the second example of the angle adjusting means 30.
FIG. 13 is a front view, and FIG. 14 is a plan view. A pair of bosses 31, 31 are fixed to the left and right at the lower part of the front surface of the bracket 11, and angle adjusting means 30, each of which is an adjusting bolt, are screwed to each. Therefore, in FIG. 13, the steel material 50 can be tilted in the direction of arrow B when viewed from the front, and at the same time, can be freely moved in the direction of arrow D, that is, left and right. Incidentally, in the plan view of FIG.
Can be substantially fixed in position and orientation. Therefore, when it is desired to determine the posture in plan view in advance, it is preferable to adopt the second embodiment.

FIG. 15 is a front view of a third embodiment of the angle adjusting means 30. A pair of bosses 31 is fixed to the left and right at the lower part of the front surface of the bracket 11, and the connecting plate 11c is provided.
A total of three internal threads 32 for the angle adjusting means 30 are provided in combination with the lower portion at the center. Then, depending on the purpose of use, as described above, one central angle adjusting means 30 is used,
For example, two right and left angle adjusting means 30 can be used.

FIG. 16 shows an example of a steel material installation operation using the hanging tool 10 according to the present invention. When the steel member 51 is installed and fixed on the upper surface of a steel pillar 52 previously installed on a floor surface 61 of a building having a ceiling 60, the steel pillar 52 is fixed.
It is necessary to accurately position the steel member 51 with respect to. In this case, first, the hanging tool 10 is attached to the tip of the second arm 7.
(Bracket 11, steel material lifting / lowering means 20, steel material holding means 4
0, etc.) (that is, the hanging member 10 is used as an attachment), the steel member 51 is suspended, and the steel member 51 is arrowed by the small mobile crane 1 that has been lifted to the vicinity of the ceiling 60. It is moved to the position of the thin two-dot chain line in the E direction. At this time, as described above, the steel member 51
And the upper end 11a of the bracket 11 are almost the same or protrude, so that the steel member 51 can be lifted up to the vicinity of the ceiling 60 without interfering with the ceiling 60 or the like. As described above, the positioning operation of the steel member 51 and the steel column 52 is performed by adjusting the mounting length S of the angle adjusting means 30 between the lower surface 51a of the steel member 51 and the upper surface 52a of the steel column 52 as described above. Can be matched. Since other minute positioning can be performed manually, accurate positioning can be easily performed. Therefore, the installation work can be performed very easily and safely.

[Brief description of the drawings]

FIG. 1 is a side view of a mobile crane to which a hanging device of the present invention is attached.

FIG. 2 is a side view of the hanging device.

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 2;

FIG. 4 is a side view of a second embodiment of the hanging device.

FIG. 5 is a drawing of a second embodiment of the steel material elevating means.

FIG. 6 is a perspective view of a steel material holding means.

FIG. 7 is a side view of a second embodiment of the steel material holding means.

FIG. 8 is a side view of a third embodiment of the steel material holding means.

FIG. 9 is a first explanatory view at the time of lifting a steel material.

FIG. 10 is a second explanatory view at the time of lifting a steel material.

FIG. 11 is a front view of the first embodiment of the angle adjusting means.

FIG. 12 is a plan view of FIG.

FIG. 13 is a front view of a second embodiment of the angle adjusting means.

FIG. 14 is a plan view of FIG.

FIG. 15 is a front view of a third embodiment of the angle adjusting means.

FIG. 16 is an explanatory diagram of a steel material installation operation.

FIG. 17 is a side view of a conventional truck crane.

[Explanation of symbols]

 7 Second arm 10 Hanging tool 11, 14 Bracket 13 Guide 15 Intermediate guide 20 Steel lifting / lowering means 21 Chain block 22 Chain 23 Handle 24 Link 26 Hydraulic cylinder 27 Hydraulic motor 30 Angle adjusting means 31 Boss 32 Female screw 40 Steel holding means 41 Holding plate 42 Holding groove 44 Hanging bracket 45 Eye bolt 50 Steel

Claims (3)

[Claims] 1. A crane arm tip suspension device which is attached to the tip of an arm (7) which can be raised and lowered with respect to a base (1) and is capable of suspending a steel material (50). (a)
A bracket (11) attached to the tip of the arm (7),
(b) An arm is provided at the upper end of the bracket (11).
A guide (13) projecting above the upper surface (7a) of (7),
(c) a steel material holding means (40) provided at the tip of a wire (22) wound down along a guide (13) and capable of holding a steel material (50); and (d) a wire (22). A lifting device at the tip of a crane arm, comprising: a steel material lifting / lowering means (20) which can be unwound or retracted and which can raise / lower a steel material (50) held by a steel material holding means (40). 2. The lifting tool according to claim 1, wherein the steel lifting means (20) is a chain block.
(21) A crane arm tip hanger characterized in that: 3. The lifting tool according to claim 1, wherein the bracket (11) includes a wire (22) wound by a steel lifting device (20) to lift the steel (50) to a maximum. A hanging tool at the tip of a crane arm, characterized by having an angle adjusting means (30) for holding the steel material (50) held by the steel material holding means (40) at any angle.