JPH11343097A - Lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate two wires by a winch designed to be used for one wire in a lifting device which is provided with a Y type jib and in which two wires are hung from the right and left tip parts of the jib. SOLUTION: A lifting device has an attachment to be attached to the tip part of a jib of a crane. The attachment is provided with a jib-branch part 11, a jib-left extension part 12, and a jib-right extension part 13 which are respectively extended forward from the right and left of the jib-branch part. Further, a left drum 15 and a right drum 17 for winding up a left wire 14 and a right wire 16 supplied respectively from the jib-left extension part 12 and the jib-right extension part 13, are provided. Then, a driving drum 19 for winding up a driving wire 18 of a winch is provided, and the left drum 15, the right drum 17, and the driving drum 19 are integrally rotated. Thus, when the driving wire 18 is wound up by the winch, the driving drum 19 is rotated, and the left drum 15 and the right drum 17 are rotated to wind up the left wire 14 and the right wire 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device in which the tip of a jib (arm) is branched right and left, and wires are respectively suspended from the two branched tips.

[0002]

2. Description of the Related Art In a general crane, for example, a wire for lifting is hung from the tip of a jib which is rotatably provided, and a hook member such as a hook is attached to the tip of the wire, and the hook is covered with the hook. It is designed to hold suspended objects.However, in places where the upper space is restricted, such as under a bridge, the suspended object may be suspended vertically from the jib tip. It was difficult to handle a long suspended object. Therefore, the present applicant has proposed a lifting device capable of easily handling a vertically long object to be lifted even in a place where the upper space is restricted (Japanese Patent Laid-Open No. Hei 7-23290).
No. 3).

In the above-mentioned lifting device, for example, as shown in FIG. 2, a Y-shaped jib 1 whose tip end is branched into two is used. When such a Y-shaped jib 1 is used, lifting wires 3 and 3 are respectively fed out from the respective ends 2 and 2 of the jib, and two objects to be lifted are provided between the two ends 2 and 2. By lifting the wires 3 and 3 in a balanced manner from the left and right, it is possible to lift the object to be lifted vertically with the upper end higher than the tip of the jib, and the upper space is limited. It is possible to easily lift a long object to be lifted in a vertical place or to convey the object to be lifted while being lifted.

[0004]

In the lifting device using the Y-shaped jib 1, it is necessary to simultaneously wind or unwind the two wires 3 and 3 by a winch. As a result, it is necessary to use a double winding drum capable of winding the two wires 3 and 3 at the same time. Therefore, for example, in a self-propelled crane or the like, when the ordinary jib and the Y-shaped jib can be used together, when the ordinary jib and the Y-shaped jib 1 are exchanged, only the jib exchange is required. Rather, it was necessary to replace the winch wire drum.

When the wires 3, 3 are routed from the wire drum 4 of the winch to the two ends of the Y-shaped jib 1, respectively, as shown in FIG. In order to perform the conversion corresponding to the above, a plurality of, for example, about three sheaves 5, 6, 7 (a pulley for a wire rope) are required for one wire 3. Then, based on the sheave efficiency, the winding force of the winch is lost for each of the sheaves 5, 6, and 7. Therefore, a plurality of sheaves 5,
When using Nos. 6 and 7, there is a problem that the winch winding force is reduced accordingly.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a winch having a wire drum for winding a single wire can be used in a lifting device having a jib whose tip end branches right and left. Further, it is another object of the present invention to provide a lifting device that does not require a plurality of sheaves for one wire in order to route the wire in accordance with the shape of a jib whose tip end branches right and left.

[0007]

According to a first aspect of the present invention, there is provided a jib in which a tip portion branches right and left and a wire for lifting can be fed out from the left and right tip portions, and the wire is wound up. A lifting device comprising a winch and a left drum for winding the wire fed from the left end, a right drum for winding the wire fed from the right end, and a wire fed from the winch. A drive drum for winding up, the left drum, the right drum, and the drive drum are rotatable in conjunction with each other, and the wire wound on the drive drum is wound on the winch to rotate the drive drum. By rotating the left drum and the right drum, the A lifting device, characterized in that is adapted to be rolled up.

According to the above construction, the wire wound around the drive drum is wound by the winch and the drive drum is rotated, so that the left drum and the right drum are rotated, and the right and left sides of the jib are rotated. Since the wire fed out from the tip can be wound up, the winch itself takes up only one wire, and it is possible to use a winch with a wire drum that winds up a single wire. it can.

According to a second aspect of the present invention, the driving drum is disposed near a branch point at which the tip of the jib branches, and the left drum corresponds to the left and right positions of the left tip of the jib. The right drum is arranged behind the right end of the jib corresponding to the left and right positions of the right end of the jib. 1. The lifting device according to 1.

According to the above configuration, since the drive drum is disposed near the branch point where the tip of the jib branches, the drive drum does not branch from the winch to the drive drum near the branch point of the jib. A single wire will be placed along the base of the jib. In addition, a wire is arranged from a left drum disposed to correspond to the left and right positions of the left end portion to the left end portion behind the left end portion of the jib, and the right end portion is disposed behind the right end portion of the jib. The wire is arranged from the right drum arranged corresponding to the left and right positions of the jib to the right end of the jib. Therefore, each wire is arranged corresponding to the shape of the jib whose tip end branches right and left, and there is no need to provide a sheave for routing the wire corresponding to the shape of the jib, and the right and left sides of the jib are not required. It is sufficient that one sheave for directing the wire downward is provided at each of the left and right distal ends.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lifting device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows an attachment 10 attached to a tip of a jib of a crane which is a lifting device of this example. By attaching the attachment 10 shown in FIG. Is approximately Y
A letter-shaped jib is formed.

The lifting device of this example includes a crane (not shown) and an attachment 10 shown in FIG. 1 attached to a tip of a jib (not shown) of the crane. The attachment 10 branches right and left. Jib branch portion 11 serving as a jib branch point, a jib left extension portion 12 and a jib right extension portion 13 extending forward from left and right of the jib branch portion 11, respectively, and a tip of the jib left extension portion 12. A left drum 15 for winding up a lifting left wire 14 drawn down from the section, a right drum 17 for winding up a lifting right wire 16 drawn down from the tip of the jib right extension 13, not shown. A drive drum 19 for winding a drive wire 18 fed from a crane winch (not shown)
It is provided with.

Further, the attachment 10 supports a left wire 14 guided from the left drum 15 to the tip of the jib left extension 12 and changes the direction of the left wire 14 so as to hang downward. 20 and right drum 1
Right wire 1 guided from 7 to the tip of jib right extension 13
6 and a right sheave 21 for changing the direction of the right wire 16 so as to hang downward.

The crane may be basically any type as long as it has a jib and a winch, but is preferably a mobile type. Also, the crane
For example, a special vehicle having an arm such as a power shovel or a backhoe with a winch attached thereto may be used. If the bucket attached to the arm is removed and the attachment 10 is attached instead, the crane is used as an example of this example. be able to.

The jib branch 1 of the attachment 10
1, the left jib extension 12 and the right jib extension 13 are integrally formed so as to have a substantially U-shape in plan view. In addition, the jib branch portion 11 has a left-right width substantially similar to the entire left-right width of the attachment 10, and
It has a bearing (not shown) that rotatably supports a rotating shaft 22 described later, which is joined to the left drum 15, the right drum 17, and the driving drum 19.

The jib branch 11 is provided with a joint member (not shown) for attaching the attachment 10 to the jib tip of the crane. Are located.
The left drum 15, right drum 17, and drive drum 19
Is a wire drum that can basically take up a wire. These left drum 15, right drum 17 and drive drum 19 are arranged side by side on the same axis and Fixed to the rotating shaft 22,
These left drum 15, right drum 17 and drive drum 19
Are integrally rotated by the rotation shaft 22.

That is, the left drum 15 is fixed to the outer peripheral portion at the left end of the rotating shaft 22, the right drum 17 is fixed to the outer peripheral portion at the right end of the rotating shaft 22, and the driving drum 19 is fixed to the substantially central outer peripheral portion of the rotating shaft 22. Has been fixed. The rotating shaft 22 is supported by the jib branch portion 11 via a bearing (not shown). The left drum 15 is disposed below the left end of the jib branch 11 to which the jib left extension 12 is attached, that is, behind the left end of the jib corresponding to the left and right positions of the left end of the jib. The drum 17 is disposed below the right end of the jib branch 11 to which the right jib extension 13 is attached, that is, behind the right end of the jib corresponding to the right and left positions of the right end of the jib. It is arranged below the left and right central portions of the jib branch portion 11, that is, in the vicinity of a portion serving as a jib branch point. Then, the joint member of the attachment 10 is disposed behind the drive drum 19. In FIG. 1, in order to illustrate the left drum 15, the right drum 17, the drive drum 19, and the like, which are hidden by the jib branch 11 and the like of the attachment 10, the jib branch 11, which is the tip of the jib, The jib left extension 12 and the jib right extension 13 are shown by phantom lines.

Next, the operation and effect of the lifting device having the above-described attachment 10 will be described. First,
Crane winch wire, ie drive wire 1
8 is attached to the drive drum 19 and the drive wire 18 is wound around the drive drum 19 by a certain length. In addition, the rear end of the left wire 14 is attached to the left drum 15, and the left wire 14 is extended to the left sheave 20 so that the tip of the left wire 14 hangs downward from the left sheave 20, and Attaching the rear end of the wire 16 to the right drum 17, extending the right wire 16 and covering the right sheave 21,
The tip of the right wire 16 is made to hang downward from the right sheave 21.

In this state, when the winch is operated and the drive wire 18 is wound by the winch, the drive wire 18 wound on the drive drum 19 is fed out to the winch side, and the drive drum 19 is rotated.
The left drum 15 and the right drum 17 rotate together with the left drum 15 and the left wire 14 and the right wire 16
And wound on the right drum 17. That is, by operating the winch, the left wire 14 and the right wire 1 are moved.
6 are wound up in synchronization with each other.

Next, with the left wire 14 and the right wire 16 wound up, a weight 23 is attached to the tip of the left wire 14 and the right wire 16, and the weight 23
4 and the tip of the right wire 16 are pulled downward, and when the winch is operated in the opposite direction to the above and the drive wire 18 is extended, the drive drum 19 is moved from the state where the winch is braked by the winch. The left drum 15 and the right drum 17 are rotatable, thereby being pulled by the weight 23, and the left wire 14 and the right wire 16 are pulled out downward, and the left drum 15 and the right drum 17 rotate, and are integrally formed therewith. Then, the driving drum 19 rotates.

Then, the drive wire 18 fed from the winch is wound on the drive drum 19.
Further, as described above, the left wire 14 and the right wire 16 that are pulled out and pulled out by the weight 23 are fed out from the left drum 15 and the right drum 17 that rotate integrally with each other, and thus are fed out in synchronization with each other. . When actually using the lifting device, the left wire 1
4 and the hanging member such as a hook attached to the tip of the right wire 16 and the hanging metal work as a weight, and the object to be lifted acts as a weight. There is no need to attach.

As described above, according to the lifting device of this example, two wires (the left wire 1
4 and the right wire 16) can be wound up and out in synchronization with each other, but at this time, the winch itself only winds up or unwinds one of the drive wires 18, so that the conventional winch is used. Thus, it is not necessary to attach a wire drum dedicated to the two wires that can take up the two wires on the winch, and an ordinary wire drum can be used.

Therefore, there is no need to replace the winch wire drum between the use of the crane having the Y-shaped jib when the attachment 10 is used as a normal crane without the attachment 10, and the attachment 10 is used. The attachment 10 can be easily changed from a normal crane to a crane having a Y-shaped jib by attaching the attachment 10 to the jib.

Further, according to the above-described structure, when the winch of the crane is arranged near the base of the jib of the crane, the drive wire 18 moves from the winch to the attachment 10 along the jib of the crane. Up to the drive drum 19 arranged at the center of the jib branch 11. In addition, the left wire 14 is arranged from the left drum 15 arranged below the left end of the jib branch 11 to the left sheave 20 below the tip of the jib left extension 12 along the jib left extension 12. Then, it is hung downward from the left sheave 20.

The right wire 16 extends from the right drum 17 disposed below the right end of the jib branch 11 along the right jib extension 13 to the right sheave below the tip of the jib right extension 13. 21 and is hung downward from the right sheave 21. Then, the drive wire 18 is arranged along the jib of the crane, the left wire 14 is arranged along the jib left extension 12, and the right wire 16 is arranged along the jib right extension 13. , Left wire 14, right wire 16
By attaching the attachment 10 to the jib of the crane, the drive wire 18 is arranged along the shape of a substantially Y-shaped jib whose tip end branches right and left.
At this time, there is no need for a sheave for routing the wires 14, 16, 18 along the shape of the jib, and the jib left extension 1
2 and the left wire 1 downward from the tip of the jib right extension 13.
It suffices if there are a left sheave 20 and a right sheave 21 for hanging the 4 and the right wire 16.

Since it is sufficient that each of the two wires (the left wire 14 and the right wire 16) for actually lifting the object to be lifted has one sheave (the left sheave 20 and the right sheave 21), a substantially Y-shape is provided. By using multiple sheaves for each wire on the left and right in order to route the wires corresponding to the shape of the jib, it is possible to reduce the winch winding force for each sheave based on the sheave efficiency. Thus, the loss of the winch winding force is small, and the winch winding force can be used efficiently. In addition, by reducing the number of sheaves, the manufacturing cost of the attachment 10 can be reduced. The lifting device of the present invention is not limited to the above example. For example, the shape of the attachment 10 may not be a U-shape, but may be a substantially Y-shape including the rear part of the jib. The attachment 10 and the jib may be integrally formed from the beginning, and may constitute a substantially Y-shaped jib.

[0027]

According to the lifting device according to the first aspect of the present invention, even if the lifting device is provided with a substantially Y-shaped jib, and the two wires are lifted in synchronization with each other, the winch itself can be replaced by a single winch. It is sufficient to operate the wire, and a winch using a wire drum for a normal wire can be used. Therefore, even if a single crane can be used with both a normal jib and a substantially Y-shaped jib by exchanging the jib or a part of the jib, the winch wire drum can be changed from one wire to two wires. No need to change for
It is very easy to replace a regular jib with a Y-shaped jib.

According to the lifting device according to the second aspect of the present invention, even if the lifting device is provided with a substantially Y-shaped jib and the two wires are lifted in synchronization with each other, the lifting can be performed along the substantially Y-shaped jib. Since it is not necessary to use multiple sheaves on one wire to route the wire, the wire is routed using multiple sheaves. Winches can be used. In addition, by reducing the number of sheaves used, manufacturing costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an attachment used in a lifting device according to an example of an embodiment of the present invention.

FIG. 2 is a perspective view showing a jib of a conventional lifting device.

[Explanation of symbols]

 Reference Signs List 10 Attachment (part ahead of jib branch) 11 Jib branch part (including jib branch point) 12 Jib left extension part (jib left tip part) 13 Jib right extension part (jib right tip part) 14 Left wire 15 Left drum 16 Right wire 17 Right drum 18 Drive wire 19 Drive drum

Claims (2)

[Claims] 1. A lifting device comprising: a jib capable of feeding a lifting wire from each of the left and right distal ends, and a winch for winding the wire, wherein the distal end is branched right and left, A left drum for winding the wire fed from the left tip, a right drum for winding the wire fed from the right tip, and a drive drum for winding the wire fed from the winch, these left drums, The right drum and the drive drum are rotatable in conjunction with each other, and the wire wound on the drive drum is wound on the winch and the drive drum is rotated to rotate the left drum and the right drum. To be able to wind up the wires fed from the left and right ends of the jib Lifting device and features. 2. The driving drum is disposed near a branch point where the tip of the jib branches, and the left drum is positioned on the left end of the jib corresponding to the left and right positions of the left end of the jib. The lifting device according to claim 1, wherein the lifting device is disposed rearward, and the right drum is disposed rearward of the right end portion corresponding to the left and right positions of the right end portion of the jib.