JPH1179669A - Jib overhang housing device for crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jib overhang housing device for a crane by which the jib overhang work is easily performed. SOLUTION: A projecting tapered part 21 is provided in the bottom of a single top 20 and mounted on a pair of rollers 11a, 11b arranged in both left/ right sides in the tip of a rotating bracket 10. A cam-shaped guide bracket 31 is fixedly provided in the adjacent to the base part of a link 30 which connects the single top 20 to a guide sheave shaft 7, and a rotating roller 13 which is brought in contact with the guide bracket 31 in moving rotationally is provided on the top of the base end of the rotating bracket 10. When the rotating bracket 10 is rotationally moved in overhanging the jib, the rotating roller 13 and the guide bracket 31 are brought in contact with each other in a prescribed position to raise the single top 20 and prevent the interference with the rotating bracket 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane jib overhang storage device.

[0002]

2. Description of the Related Art FIG. 11 is a side view of a movable crane, showing a state in which a jib 4 is stored side by side on a side surface of a boom 2. A boom 2 is mounted on the vehicle body 1 so as to be able to move up and down, and a top boom 3 is installed inside the boom 2 so as to be able to move in and out. A rotating bracket 10 is attached to the top boom 3 so as to be rotatable in the lateral direction. Rotating bracket 10
Has a jib 4 detachably attached thereto. A base end of a link 30 is pivotally attached to an upper end of the top boom 3.
The single top 20 is provided at the tip of the link 30. The tip sheave 5 is mounted on the single top 20.

An example of such a crane jib overhang storage device in a mobile crane is Japanese Patent Application No. 8-224356 previously proposed by the present applicant. FIG. 12 is a side view of the tip of the boom when the jib is in the retracted state. The rotation bracket 10 is provided with a lock cylinder 40. The expansion and contraction of the lock cylinder 40 actuates the first and third connecting pins 41 and 42 attached above and below the lock cylinder 40, whereby the left and right sides of the tip of the top boom 3 and the left and right sides of the rotating bracket 10 are moved. One side is connected or disconnected. The base end of the link 30 is attached to the guide sheave shaft 7 of the guide sheave 6. The base end of the link 30 and the lock cylinder 40 are connected to a link rotation driving device 50.
(See FIG. 13), and the lock cylinder 40
When is extended, the link 30 rotates about the guide sheave shaft 7 to raise the single top 20. A support table 60 on which the single top 20 is placed is provided on the upper surface of the front end of the rotating bracket 10. 8 is an auxiliary hook.

FIG. 13 is a side view showing the structure of the link rotation driving device 50. Shaft 51 supported by top boom 3
, A first lever 52 and a second lever 54 having a roller 53 at the tip are fixedly provided. The first lever 52 and the base end of the link 30 are connected by a rod 55. The roller 53 abuts on the upper surface of the lower plate 43a of the third link 43 rotatably mounted on the upper part of the lock cylinder 40. When the lock cylinder 40 is extended, the lower plate 43a pushes up the roller 53, and the second lever 54, the first
The link 30 is rotated via the lever 52 and the rod 55.

When the jib 4 is extended, as shown in FIG. 14, the lock cylinder 40 is extended, and the top boom 3 and the rotating bracket 10 are connected by the first and third connecting pins 41 and 42. Link rotation drive 50
As a result, the link 30 is rotated about the guide sheave shaft 7 and the single top 20 is positioned above and in front of the top boom 3.

Next, as shown in FIG. 15, the rotating bracket 10 is connected to the first and third connecting pins 41 of the lock cylinder 40,
By rotating the jib 4 in the lateral direction about the center 42 and projecting the jib 4 forward of the top boom 3, the top boom 3 and the rotating bracket 10 are connected. At that time, the single top 20
Is mounted on a support table 60 provided at the tip of the rotating bracket 10 and supports the load applied to the auxiliary hook 8.

Next, as shown in FIG. 16, a wire rope having an auxiliary hook 8 at the tip is wound around a load sheave 47 provided at the tip of the jib 4 via a guide sheave 46 provided at the upper surface of the tip of the jib 4. . Then, the jib 4 is maintained at an appropriate angle by extending a sheave cylinder 48 which is provided between the rotating bracket 10 and the jib 4 and makes the jib 4 undulateable.

[0008]

However, according to the above-mentioned conventional configuration, the link ratio of the link rotary drive device 50 is very large, and the position of the single top 20 is greatly changed even if there is a slight bending or error. As shown by the thin dashed line in FIG. 14, the single top 20 does not rise sufficiently and the tip of the support
There is a problem that it interferes with the jib extension and hinders the jib overhang operation. In addition, since the single top 20 is merely placed on the support base 60, when the boom 2 is rapidly raised, the link 30 may fall backward around the guide sheave shaft 7.

The present invention has been made in view of the above problems, and provides a crane jib overhang storage device capable of performing a jib overhang operation without any trouble and stably mounting a single top on a tip end portion of a rotating bracket. The purpose is.

[0010]

In order to achieve the above object, a first embodiment of a crane jib overhang storage device according to the present invention is shown in FIGS. 1, 6, and 7, for example. A jib 4 which achieves a retracted posture by being juxtaposed to a side surface of a boom 2 of a crane, and a rotating bracket 10 which rotatably supports the jib 4 and is rotatably supported at the tip of the boom 2 in a lateral direction. And a link 30 having a base end rotatably supported in the vertical direction at the distal end of the boom 2 and having a single top 20 at the distal end, and one end of the boom 2 and the rotating bracket 10 in the left-right direction. When the lock cylinder 40 is engaged with the lock cylinder 40 and the lock cylinder 40 is operated, the link 30 is rotated upward to thereby position the single top 20 in front of and above the boom 2. And a braking system 50, when the overhang of the jib 4, a single top 20 by rotating the link 30 upward by actuating the lock cylinder 40 the boom 2
, And then rotate the rotating bracket 10 laterally from the retracted position toward the front of the boom 2 to project the jib 4 toward the front of the boom 2 so that the single top 20 is positioned at the top of the tip of the rotating bracket 10. The crane has a jib overhanging storage device having a convex portion on the contact portion side of the single top 20 in the contact portion between the rotating bracket 10 and the single top 20, and the tip of the rotating bracket 10. It is characterized in that it has a concave portion with which the convex portion of the single top 20 is engaged at the upper part.

According to the first configuration, the single top 2
The engagement of the convex portion of No. 0 with the concave portion of the rotating bracket 10 causes the position of the single top 20 with respect to the rotating bracket 10 to be automatically aligned, thereby stabilizing the position.

Second, as also shown in FIGS. 1, 6, and 7, a jib 4 for achieving a retracted posture by being juxtaposed to a side surface of a boom 2 of a crane, and a jib 4 for pivotally supporting the jib 4 up and down. In addition, a rotating bracket 10 rotatably supported on the distal end of the boom 2 in the lateral direction and a base end rotatably supported on the distal end of the boom 2 in the vertical direction and a single top 20 on the distal end. A link 30, a lock cylinder 40 for connecting one end of the boom 2 and the rotating bracket 10 in the left-right direction, and a lock cylinder 40 which is engaged with the lock cylinder 40 to rotate the link 30 upward, thereby causing a single And a link rotation drive device 50 for positioning the top 20 in front of and above the boom 2. When the jib 4 is extended, the lock cylinder 40 is operated to rotate the link 30 upward. Then, the single top 20 is positioned above and in front of the boom 2, and then the rotating bracket 10 is laterally rotated from the storage position toward the front of the boom 2 to project the jib 4 toward the front of the boom 2. In a jib overhang storage device of a crane in which the single top 20 is placed on the upper end of the top 10, of the contact portions between the rotating bracket 10 and the single top 20, a convex shape is formed on the contact portion side of the single top 20. In addition to forming the tapered portion 21, a side plate 22 is provided extending from the end of the convex tapered portion 21 toward the storage side of the rotating bracket 10 along the tapered portion surface, and the upper end of the rotating bracket 10 is provided. Are provided with rollers 11a and 11b rotatably in contact with the convex tapered portion 21 of the single top 20 at both left and right end portions. It is.

According to the second configuration, the rotating bracket 1
At the upper left and right ends, a single top 2
Rollers 11a and 11b which are in contact with the 0 tapered portion 21 and the side plate 22 and are rotatable are provided. For this reason, even if the lower end surface of the single top 20 and the upper end of the rotating bracket 10 interfere with each other when the rotating bracket 10 is rotated for projecting the jib 4, the roller 1
1a, 11b are single top 20 side plates 2
Rolling from 2 comes into contact with the tapered surface of the tapered portion 21.
Accordingly, the single top 20 is lifted upward with the rotation of the rotating bracket 10, and is stabilized at a predetermined position by the automatic centering action of the tapered portion 21. The operation during this time is smoothly performed by the rotation of the rollers 11a and 11b.

Third, for example, as shown in FIGS. 1, 2, 8, and 9, the jib overhang storage device of the first or second crane is provided near the base end of the link 30. And a second member provided on the rotating bracket 10 and moving the link 30 in a direction away from the rotating bracket 10 when the link 30 comes into contact with the first member.

According to the third configuration, the first member is provided at the base end of the link 30 to contact the second member provided on the rotating bracket 10 to separate the link 30 from the rotating bracket 10. Therefore, when the rotating bracket 10 is rotated, the second member abuts on the first member and raises the distal end of the link 30, so that the upper end of the rotating bracket 10 does not interfere with the lower surface of the single top 20. . Therefore, no lateral bending force is applied to the distal end side of the link 30 from the first member, so that the structure can be simplified and the weight can be reduced.

Fourth, as shown in FIGS. 1 and 2, for example,
In the jib overhanging storage device of the third crane,
The member is the cam 31, and the second member is the rotating roller 13 that contacts the cam 31.

According to the fourth configuration, the rotating bracket 1
The lifting operation of the link 30 accompanying the rotation movement of the cam
This is performed by the contact motion between the roller 1 and the rotating roller 13. Therefore, the operation is performed smoothly, and the lateral bending force applied to the proximal end of the link 30 is reduced or eliminated, and the weight can be reduced. 8 and 9, the cam 31 corresponds to the cam 45, and the rotating roller 13 corresponds to the roller 53.

Fifth, for example, as shown in FIGS.
In any one of the first to fourth crane jib overhang storage devices, the single top 20 and the rotating bracket 10
And locking means for detachably locking.

According to the fifth configuration, when the boom 2 is erected, there is no possibility that the single top 20 and the link 30 will fall backward.

Sixth, as also shown in FIGS.
In the jib overhanging storage device of the fifth crane, the locking means is a guide bar 2 fixed to the single top 20.
3 and a guide bar 23 fixedly mounted on the rotating bracket 10.
And a hook plate 12 that can be engaged with the hook plate 12.

According to the sixth configuration, the hook plate 1
2 is engaged with the guide bar 23, so that the single top 20 can be automatically locked to the rotating bracket 10 by rotating the rotating bracket 10 forward of the boom 2, thereby facilitating the operation. You.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiment according to the present invention will be described below with reference to FIGS.

FIG. 1 is a side view of the jib overhanging storage device, and FIG. 2 is a plan view showing a state in which the rotating bracket 10 is overhanging the front of the boom 2. The top boom 3, the tip sheave 5, the guide sheave 6, the guide sheave shaft 7, the lock cylinder 40, the first connection pin 41, the third connection pin 42, and the link rotation driving device 50 have the same parts and functions as those of the conventional one. Therefore, a duplicate description will be omitted, and different portions will be described.

At the tip of the top boom 3, a rotating bracket 10 having a jib 4 is provided with first and third connecting pins 41, 42.
Is attached so as to be rotatable in the lateral direction (in the direction of arrow E in FIG. 2). The single top 20 on which the distal sheave 5 is pivotally mounted is mounted on the distal end of a link 30, and the proximal end of the link 30 is rotatably mounted on the guide sheave shaft 7. The base end of the link 30 is also connected to the link rotation drive device 50. Single top 20 is rotating bracket 1
0 at the top of the tip.

FIG. 3 is a detailed view of a portion A in FIG. 1, and FIG.
FIG. 5 is a view taken in the direction of arrows CC in FIG. 4. A pair of rollers 11 are provided on the left and right sides of the upper end of the rotating bracket 10.
a and 11b are rotatably mounted on the rotating bracket 10
A hook plate 12 is fixedly provided substantially at the center of the upper end of the hook. Single top 20 rotating bracket 10
A convex tapered portion 21 is provided on the contact surface of the rotating bracket 10, and a guide plate 22 is fixedly provided at the end corresponding to the storage direction of the rotating bracket 10 by extending the tapered portion 21.
In addition, as shown in FIGS.
A guide bar 23 is fixedly provided substantially at the center of the lower part of the jig 4 so as to engage with the hook plate 12 when the jib 4 is in the extended state.

When the jib 4 is extended from the retracted state to the front of the boom 2, the rotating bracket 10 is pivoted from the retracted position in the direction of arrow E about the first connecting pin 41 as shown by the dashed line in FIG. Let it. At this time, when the link 30 is bent and the position of the single top 20 is lowered, as shown in FIG.
, And the rotating bracket 10 further moves in the direction of arrow F to lift the single top 20. When the rotating bracket 10 is further rotated, the roller 11a advances while lifting the single top 20 along the tapered portion 21 of the single top 20, and engages the hook plate 12 with the guide bar 23 as shown in FIG. Then, the state shown in FIG. During this operation, the tapered portion 21 is
Since a is rolling, it is performed smoothly. Single Top 20
Has a convex tapered portion 21, and the right and left rollers 11
Since they are supported by a and 11b, their positions are automatically aligned as shown in FIGS. Therefore, the single top 20 is stably mounted on the rotating bracket 10 in the left-right direction. In the state shown in FIG. 4, the hook plate 12 and the guide bar 23 are engaged. Thus, the single top 20 is locked vertically with respect to the rotating bracket 10. Therefore, even if the boom 2 is rapidly raised, the single top 20 does not fall backward.

According to the configuration of the above embodiment, the tip of the rotating bracket 10 and the single top 20 interfere with the rotating movement of the rotating bracket 10. Therefore, there is a disadvantage that the link 30 bends sideways. Therefore, a link lifting means capable of preventing the bending will be described below.

A first example will be described with reference to FIGS. As shown in FIGS. 1 and 2, the first position of the link 30 is on the side of the rotation bracket 10 near the base end near the guide sheave shaft 7 and along the rotation circle around the connection pin 41. A cam-shaped guide bracket 31 as a member is fastened to an arm 32 fixed to the link 30 by a bolt 33. On the other hand, at the upper surface on the base end side of the rotating bracket 10 and at a position corresponding to the guide bracket 31, a rotating roller 13 as a second member having a rotating radius R around the connecting pin 41 as a rotating axis direction is provided. It is arranged.
The bolt holes provided in the arm 32 are vertically elongated holes, and the vertical position of the guide bracket 31 can be adjusted by tightening a back nut (not shown) into the bolt 33.

The operation of the first example will be described. As shown by the one-dot chain line in FIG. 2, when the rotating bracket 10 is rotated in the direction of the arrow E, and the leading end reaches near the single top 20, the rotating roller 13 contacts the guide bracket 31 and raises the single top 20. Thus, the tip of the rotating bracket 10 and the single top 20 do not interfere with each other.
When the rotating bracket 10 is further rotated, as shown in FIG. 1, the rotating roller 13 is displaced from the position of the guide bracket 31, and the tapered portion 21 of the single top 20 is placed on the rollers 11 a and 11 b at the tip of the rotating bracket 10. Is placed.

The effect of the first example will be described. If the first example does not exist, a lateral force is applied to the link 30 when the rotating roller 13 and the guide bracket 31 contact each other,
You will bend. However, according to the first example, when the rotating bracket 10 is rotated around the connection pin 41, the rotating roller 13 contacts the guide bracket 31,
The guide bracket 31 (that is, the link 30) is rotated upward around the guide sheave shaft 7, and the single top 20 is raised so that the tip of the rotating bracket 10 does not interfere with the single top 20. Therefore, the lateral bending of the link 30 can be prevented. Since the guide bracket 31 is located near the base end, the link 3
It is relatively easy to improve the strength at 0 and the increase in weight can be suppressed. Since no lateral force is applied to the distal end of the link 30, the weight of the link 30 in this portion can be reduced. In the case of the first example, the guide plate 22 may not be provided.

Next, a second example will be described. FIG. 8 is a side view of the link rotation drive device 50, and FIG. 9 is a view taken along the line DD in FIG. Shaft 51, first lever 52, roller 53, second lever 54, rod 55 attached to top boom 3
11 is the same as the conventional one already described with reference to FIG. 11, and a duplicate description will be omitted, and different parts will be described.

A plate 44 is fixed below the third link 43 at the upper end of the lock cylinder 40. The roller 53 of the link rotation driving device 50 is in contact with the plate 44. A cam 4 is provided at a predetermined position on the upper surface of the plate 44.
5 is fixed. The lock cylinder 40 rotates together with the rotating bracket 10. Therefore, when the lock cylinder 40 is extended, the link 30 is raised by the link rotation driving device 50 to raise the single top 20 as described above. Thereafter, when the rotating bracket 10 is rotated to protrude the rotating bracket 10, the cam 45 contacts the roller 53 at a predetermined position, and the link 30 is further erected than by the link rotation driving device 50, and the single top 20 is rotated. To rise. Therefore, interference between the single top 20 and the rotating bracket 10 is prevented. When the rotating bracket 10 rotates to a predetermined position, the cam 45 and the roller 5 are rotated.
3 and the single top 20 is a rotating bracket 10
Placed on Because of the above configuration, link 3
A large lateral force is not applied to 0, and the weight can be reduced.

When storing the link 30, as shown in FIG.
0 is fixed with a pin 34. At this time, in the first example, the guide bracket 31 is inserted into a hole (not shown) formed in the tip of the top boom 3.

Incidentally, depending on the crane, the top boom 3
There is also one that has no boom and is constituted by one boom 2. The above embodiment may be applied to such a boom 3. In this case, the top boom 3 is replaced with the boom 2.

[Brief description of the drawings]

FIG. 1 is a side view of a crane jib overhang storage device according to an embodiment.

FIG. 2 is a plan view of FIG.

FIG. 3 is a detailed view of a portion A in FIG. 1;

FIG. 4 is a view taken in the direction of arrow B in FIG. 3;

FIG. 5 is a view taken in the direction of the arrows CC in FIG. 4;

FIG. 6 is an explanatory diagram of an engagement operation between a single top and a rotating bracket.

FIG. 7 is an explanatory view of the engagement operation between the single top and the rotating bracket following FIG. 6;

FIG. 8 is a side view of the link rotation driving device according to the embodiment.

FIG. 9 is a view taken in the direction of arrows DD in FIG. 8;

FIG. 10 is an explanatory diagram when a link is stored.

FIG. 11 is a side view of the mobile crane.

FIG. 12 is a side view of a conventional boom tip in a retracted state.

FIG. 13 is a side view of a conventional link rotation driving device.

14 is an explanatory diagram of the jib overhang operation of FIG.

FIG. 15 is an explanatory diagram of the jib overhang operation following FIG. 14;

FIG. 16 is an explanatory diagram of the completion of the jib overhang following FIG. 15;

[Explanation of symbols]

 3 Top Boom 5 Tip Sheave 7 Guide Sheave Shaft 10 Rotating Bracket 11a, 11b Roller 12 Hook Plate 13 Rotating Roller 20 Single Top 21 Tapered Part 22 Guide Plate 23 Guide Bar 30 Link 31 Guide Bracket 32 Arm 40 Lock Cylinder 44 Plate 45 Cam 50 Link rotation drive

Claims (6)

[Claims] 1. A jib 4 which achieves a retracted posture by being juxtaposed to a side surface of a boom 2 of a crane; Rotating bracket 10 and the boom 2
A link 30 rotatably supported in the vertical direction at the tip of the boom and having a single top 20 at the tip, and a boom 2
A lock cylinder 40 connecting one end of the boom 2 to the boom 2 when the lock cylinder 40 is engaged with the lock cylinder 40 and the lock cylinder 40 is operated, whereby the link 30 is rotated upward. And a link rotation drive device 50 located at the front upper side. When the jib 4 is extended, the lock cylinder 40 is operated to rotate the link 30 upward, thereby causing the single top 20 to rotate.
Is positioned in front of and above the boom 2, and then the rotating bracket 10 is laterally rotated from the storage position toward the front of the boom 2 to project the jib 4 toward the front of the boom 2 so that the jib 4 is located at the top of the tip of the rotating bracket 10. Single Top 20
In the crane jib overhanging storage device
The contact portion between the rotating bracket 10 and the single top 20 has a convex portion on the contact portion side of the single top 20, and the single top 2
A jib overhang storage device for a crane, characterized in that the crane has a concave portion with which the 0 convex portion engages. 2. A jib 4 that achieves a retracted posture by being juxtaposed to a side surface of a boom 2 of a crane, and a jib 4 that is pivotally supported up and down and is rotatably supported by a tip of the boom 2 in a laterally rotatable manner. Rotating bracket 10 and the boom 2
A link 30 rotatably supported in the vertical direction at the tip of the boom and having a single top 20 at the tip, and a boom 2
A lock cylinder 40 connecting one end of the boom 2 to the boom 2 when the lock cylinder 40 is engaged with the lock cylinder 40 and the lock cylinder 40 is operated, whereby the link 30 is rotated upward. And a link rotation drive device 50 located at the front upper side. When the jib 4 is extended, the lock cylinder 40 is operated to rotate the link 30 upward, thereby causing the single top 20 to rotate.
Is positioned in front of and above the boom 2, and then the rotating bracket 10 is laterally rotated from the storage position toward the front of the boom 2 to project the jib 4 toward the front of the boom 2 so that the jib 4 is located at the top of the tip of the rotating bracket 10. Single Top 20
In the crane jib overhanging storage device
Among the contact portions between the rotating bracket 10 and the single top 20, a convex taper portion 21 is formed on the contact portion side of the single top 20, and along the end of the convex taper portion 21 along the surface of the taper portion. The side plate 22 is provided to extend toward the storage side of the rotating bracket 10, and is rotatable by contacting the convex tapered portion 21 of the single top 20 at the left and right ends of the upper end of the rotating bracket 10. A crane jib overhang storage device, comprising rollers 11a and 11b. 3. The crane jib overhang storage device according to claim 1, wherein the first member is provided near the base end of the link 30 and the first member is provided on the rotating bracket 10.
When the link 30 comes into contact with the member, the link 30 is rotated.
And a second member that moves in a direction away from the crane. 4. The jib overhang storage device according to claim 3, wherein the first member is a cam 31, and the second member is a rotary roller 13 abutting on the cam 31. Overhang storage device. 5. The crane jib overhang storage device according to claim 1, further comprising locking means for locking the single top 20 and the rotating bracket 10 in a detachable manner. Crane jib overhang storage device. 6. The crane jib overhanging and retracting device according to claim 5, wherein the locking means is fixed to the guide bar 23 fixed to the single top 20 and to the guide bar 23 fixed to the rotating bracket 10. A jib overhang storage device for a crane, comprising a hook plate 12 which can be freely adjusted.