JPH08282976A - Mobile crane load lifting device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a mobile crane load lifting device capable of inserting a high load between a floor and a ceiling. [Structure] A bracket 10 is pivotally attached to the end of a horizontal boom 1 of a reach tower crane with a pin 4. The columnar member 21 including the pyramidal portion 22 and the cylindrical portion 23 is attached to the tip of the wire 5, and the annular member 24 is inserted into the cylindrical portion 23. Annular member 2
The pair of plates 30 is attached to the pin 25 of No. 4, and the hook 35 is attached to the lower part thereof. When the wire 5 is pulled up, the pyramid portion 22 engages with the bracket 10 and the bracket 10 rotates forward. Therefore, the height from the upper end of the boom 1 to the hook 35 becomes small, and the length of the load that can be inserted becomes large.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a load lifting device mounted on the tip of a wire of a mobile crane.

[0002]

2. Description of the Related Art A mobile crane is often used to carry a load to an upper floor in a high-rise construction work. In the conventional crane, the boom 40 as shown in FIG.
Since the load 41 is hung in the upright state, it is extremely difficult to insert the load 41 between the floor 42 and the ceiling 43.

As a countermeasure for this, a reach tower crane having a horizontal boom at the tip of the boom has been developed. FIG.
FIG. 4 is a diagram showing a load insertion state in a reach tower crane, in which a hanging load 52 is hung on a hanging tool 51 attached to the end of a horizontal boom 50, and the horizontal boom 50 is reached to reach the floor 42 and the ceiling. It is possible to insert between 43.

[0004]

However, even in the reach tower crane, as shown in FIG.
And the distance between the ceiling 43 and the ceiling 43 is H, the height of the horizontal boom 50 (H3) + the height of the hanging tool 51 (H
4) + the height of the suspended load 52 (H5) <H, and the value of H3 + H4 is large, so that the height H5 of the suspended load 52 is limited, and it is difficult to carry in a very high load.

The present invention has been made in view of the above problems, and an object of the invention is to provide a load hoisting device for a crane of the type capable of inserting a tall load between the floor and the ceiling. I am trying.

[0006]

In order to achieve the above-mentioned object, in the load hoisting device for a mobile crane according to the present invention, in the hoisting device of the crane, the tip of the boom and the hoisting device are pulled up. And a means for always positioning the suspended load in the vertical direction.

The load hoisting device comprises a bracket rotatably mounted in series on the boom by a pin located rearward of the center of the wire, which is located below the wire sheave mounted on the tip of the boom, and a wire when the wire hoisting device is pulled up by the wire. It is configured to include a suspender that engages with the bracket and constantly positions the suspended load in the vertical direction with respect to the rotation of the bracket.

The bracket has at least two wire sheaves for sandwiching the wire.

The suspender includes a columnar member connected to a wire, an annular member rotatably attached to the columnar member with respect to an axis of the columnar member, and swingably attached to the annular member. It is composed of a hanging member.

The columnar member has a tapered portion which is engaged with the bracket when pulled up.

The hanging member has a structure having engaging holes for attaching at least three hooks below.

[0012]

With the above-mentioned structure, the wire is pulled and the hanger is pulled up and locked to the bracket.
When the wire is further pulled, the bracket rotates and is pulled up in front of the boom in series with the boom. for that reason,
The height dimension of the boom and the hanger becomes smaller. Further, the suspended load is always positioned in the vertical direction, and its direction is also regulated.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a load lifting device for a mobile crane according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view of a first embodiment of a load hoisting device, and FIG. 2 is a perspective view showing a component structure of the same. A wire sheave 2 that guides a wire 5 for hanging a load is axially attached to the upper end of the horizontal boom 1 of the reach tower crane, and a stopper 3 is fixed to the central portion and the side surface of the end. At the lower end of the horizontal boom 1, attach the wire sheave 2
A bracket 10 is rotatably mounted by a pin 4 centered at a position B located a predetermined distance S behind a center A of a wire 5 which is further lowered. The bracket 10 includes a pair of plates 11 and 11, and
A first wire sheave 12 and a second wire sheave 13 are axially attached by pins 14 and 14 between them, and when the bracket 10 is suspended by the pins 4, the first wire sheave 12 is rearward with the wire 5 interposed therebetween. On top,
The second wire sheave 13 is located in the lower front part.

A hanger 20 is suspended at the tip of the wire 5. That is, a columnar member 21 including a pyramidal portion (tapered portion) 22 and a cylindrical portion 23 is attached to the tip of the wire 5, and an annular member 24 having pins 25, 25 on both sides is rotatably inserted into the cylindrical portion 23. And the seat plate 26 is bolted 27.
The annular member 24 is fastened to the lower surface of the cylindrical portion 23 by
Holding Pins 25, 25 on both sides of the annular member 24
The holes 31 and 31 provided in the upper part of the pair of triangular plates 30 and 30 are inserted in this, and can be rocked | fluctuated.
The left and right plates 30, 30 are fastened and coupled together by bolts 33 via a connecting member 32. Each plate 3
Holes 34, 34 are provided at both lower ends of 0, and hooks 35,
35 is attached. That is, the hook 35 has a total of 4
Individual.

Next, the operation will be described. FIG. 1 shows a state in which the hanger 20 is hung by the wire 5.
Since the bracket 10 sandwiches the wire 5 by the first wire sheave 12 and the second wire sheave 13, the bracket 10 is kept in a vertical state.

In FIG. 3, the load 6 is hung on the hook 35,
The state where the hanging member 20 is pulled up by the wire 5 and the columnar member 21 is brought into contact with the lower end of the bracket 10 is shown.
That is, the pair of plates 11, 11 of the bracket 10
The lower end portion of the columnar member 2 engages with the pyramidal portion 22 of the columnar member 21 as shown in FIG.
The direction of the bracket 1 with respect to the bracket 10 is restricted. The inner width W2 of the plates 30, 30 of the hanger 20 is set wider than the outer width W1 of the plates 11, 11 of the bracket 10. The suspended load 6 is suspended by four hooks 35 as shown by a thin two-dot chain line, and the direction with respect to the plate 30 is restricted.

When the wire 5 is further pulled, the bracket 10 rotates forward around the pin 4 as shown in FIG.
At this time, vertical and downward forces are exerted on the pins 25 of the annular member 24, so that the columnar member 2 is applied to the annular member 24.
A rotating force acts around the cylindrical portion 23 of No. 1 so that the annular member 24 located at the position shown in FIG. 3 rotates around the cylindrical portion 23 as indicated by a dotted arrow, and as shown in FIG.
0 and 30 are parallel to the horizontal boom 1. Further, the plates 30 and 30 are the pins 25 and 2 of the annular member 24.
5, the suspended load 6 is always positioned in the vertical direction, and is regulated in a direction in series with the horizontal boom 1.

When the wire 5 is further pulled, the plates 11 and 11 of the bracket 10 come into contact with the stopper 3 of the boom 1 and stop as shown in FIG. At this time, since the bracket 10 and the columnar member 21 are positioned in front of the horizontal boom 1 and the plate 30 swings and faces the vertical direction, the suspended load 6 is positioned in the vertical direction and is in series with the horizontal boom 1. Facing the direction. That is, the hanging load 6 is always positioned in the vertical direction with respect to the rotation of the bracket 10, and is regulated in the direction in series with the horizontal boom 1.

When the insertion work is performed in the posture shown in FIG.
As shown in FIG. That is, since the total height H1 of the horizontal boom 1, the bracket 10 and the hanger 20 becomes smaller, the height H2 of the load 7 that can be inserted becomes larger.

FIG. 7 is a side view of the second embodiment of the load lifting device, and FIG. 8 is a perspective view showing the structure of the bracket 10A portion. The configuration of parts other than the bracket 10A is the same as that of the first embodiment, so the description thereof is omitted and only different parts and related parts will be described. The bracket 10A is composed of a pair of plates 11 and 11, and a bottom plate 15 having a square hole 16 is welded to the bottom. The square hole 16 is adapted to engage with the pyramidal portion 22 of the columnar member 21.

FIG. 9 (a) shows a state in which the hanging load 6 is hung on the hook 35, the hanging tool 20 is pulled up by the wire 5, and the pyramidal portion 22 of the columnar member 21 is engaged with the square hole 16 of the bracket 10A. ing. FIG. 9B is a view on arrow D of FIG. 9A. At this time, the bracket 1 of the columnar member 21
The direction to 0A is regulated.

When the wire 5 is further pulled, as shown in FIG. 10, the bracket 10A rotates forward around the pin 4, the annular member 24 rotates, the plate 30 swings, and the suspended load 6 moves vertically. It is located and faces in series with the horizontal boom 1. In this case, the square hole 16 and the columnar member 2
The columnar member 21 is not displaced even if the weight of the suspended load 6 is heavy because it is engaged with 1.

When the wire 5 is further pulled, the bracket 10A rotates around the pin 4 as shown in FIG. 11, and the plates 11 and 11 come into contact with the stopper 3 of the horizontal boom 1 and stop.

The square hole 16 has a shape other than a square, for example, 3
It is a prism or a hexagon, and the pyramidal portion 22 of the columnar member 21 is 3
It may be a pyramid or a hexagonal pyramid. That is, any shape may be used as long as they are engaged with each other and their directions are regulated.

Since the present invention is configured as described above in detail, it is possible to obtain a load suspending device for a mobile crane in which even a heavy load can be easily inserted between the floor and the ceiling.

[Brief description of drawings]

FIG. 1 is a side view of a first embodiment of a load lifting device of the present invention.

FIG. 2 is a perspective view showing a component structure of the same.

FIG. 3 is a side view showing a state in which the hanger is pulled up and brought into contact with the bracket.

FIG. 4 is a side view showing a state where the bracket is being rotated.

FIG. 5 is a side view showing a state in which the bracket is finished rotating.

FIG. 6 is an explanatory view showing a state in which an insertion operation is being performed by the load lifting device of the present invention.

FIG. 7 is a side view of a second embodiment of the load lifting device of the present invention.

FIG. 8 is a perspective view showing a component structure of the same.

FIG. 9 is a side view showing a state in which the lifting tool is pulled up and brought into contact with the bracket.

FIG. 10 is a side view showing a state where the bracket is being rotated.

FIG. 11 is a side view showing a state in which the bracket has finished rotating.

FIG. 12 is an explanatory diagram showing a state in which a conventional crane is performing insertion work.

FIG. 13 is an explanatory view showing a state where a conventional reach tower crane is performing insertion work.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Horizontal boom, 3 ... Stopper, 5 ... Wire, 10 ... Bracket, 11, 30 ... Plate, 12 ... 1st wire sheave, 13 ... 2nd wire sheave, 15 ... Bottom plate, 16 ... Square hole, 20 ... Hanging tool, 21 ... pillar member, 22 ... pyramid part, 2
3 ... Cylindrical part, 24 ... Annular member, 25 ... Pin, 26 ... Seat plate, 32 ... Connection member, 35 ... Hook.

Claims (6)

[Claims] 1. A mobile lifting device for a crane, comprising means for engaging the tip of the boom with the lifting device by pulling up a wire and for constantly positioning a suspended load in a vertical direction. Crane load lifting device. 2. The load hoisting device according to claim 1, further comprising: a bracket rotatably mounted in series on the boom by a pin located rearward of a center of a wire that is lower than a wire sheave mounted on a tip of the boom. 2. A load hoist for a mobile crane according to claim 1, further comprising a hoisting tool which engages with the bracket when pulled up by a wire and always positions the hoisted load in a vertical direction with respect to the rotation of the bracket. apparatus. 3. The load lifting device for a mobile crane according to claim 2, wherein the bracket according to claim 2 includes at least two wire sheaves for sandwiching the wire. 4. The hanging device according to claim 2, wherein a columnar member connected to the wire, an annular member rotatably attached to the columnar member with respect to an axis of the columnar member, and a swing member attached to the annular member. The load suspending device for a mobile crane according to claim 2, characterized in that the load suspending device is movably mounted. 5. The load lifting device for a mobile crane according to claim 4, wherein the columnar member according to claim 4 has a tapered portion that is engaged with the bracket when pulled up. 6. The load hoisting device for a mobile crane according to claim 4, wherein the hoisting member according to claim 4 has engaging holes for attaching at least three hooks downward.