JP3100115B2 - Crane jib overhang, containment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Each time a jib of a crane mounted on a vehicle is extended and stored, an operator rides on a stepladder and manually inserts and removes pins. Therefore, the operation was dangerous and required a lot of labor. Overhang di Bed To resolve this problem, automated storage operations have been achieved. An example is Japanese Patent Application No. 6-52734.
The one proposed by JP-A-7-237888 will be described below.

FIG. 9 is a plan view of a vehicle-mounted crane equipped with an automatic extension and storage device of a jib. Is mounted to be able to undulate. A rotating bracket 70 for detaching or connecting the jib 8 and the top boom 50 of the multi-stage boom 4 is provided.
A horizontal holding device 5 for swinging a jib 8 operated by a hydraulic device in a lateral direction; a first locking device 6 and a second locking device 7 for locking a top boom 50 and a rotating bracket portion 70; and a rotating device 80. which rotates the rotary bracket 70 against.

[0004] The jib 8 attached to the tip of the top boom 50 via the rotating bracket portion 70 is stored side by side with the multi-stage boom 4 in a running state, and is supported by the horizontal holding device 5. At the time of overhang, the jib 8 is held horizontally.
Swings in the horizontal direction (W direction in the drawing) as shown by the two-dot chain line. That is, it is started to swing.

FIG. 10 is a plan view of the rotating bracket portion 70, showing a state in which the jib 8 is stored in the multi-stage boom 4 side by side. A top boom pin 51 and a rotation support pin 52 are provided on one side in the left-right direction of the tip of the top boom 50, that is, on the side near the boom tip when the jib and the boom are juxtaposed.
Is pinned, and a pin hole 53 is formed on the other side, that is, on the far side of the boom tip when the jib and the boom are arranged side by side. The first locking device 6 is mounted on one side surface of the rotating bracket portion 70, and the second locking device 7 is mounted on the other side surface. A groove 71 that engages with the top boom pin 51 is provided on one side in the left-right direction on the rear end side of the rotating bracket portion 70, and a pin hole 72 that matches the pin hole 53 of the top boom 50 is provided on the other side. ing.

As shown in FIG. 10 , the rotation device 80 has one end of a first lever 81 pivotally mounted on a pin 73 fixed near one rear end of the rotation bracket 70. First lever 8
One end of the second lever 82 is pivotally mounted on the other end of the first lever 82. The other end of the second lever 82 is provided with a groove 83 that engages with the rotation support pin 52 fixed to the top boom 50. First lever 8
The first and second levers 82 are connected by a spring 84. The pin 74 fixed to the rotating bracket 70 and the first lever 8
1 is connected to the central portion by a rotary cylinder 85.

When the jib 8 is extended, as shown in FIG. 9 , the jib 8 is swung out by the horizontal holding device 5. Figure 11
FIG. 7 is a plan view showing the state of connection between the top boom 50 and the rotating bracket 70 when the jib 8 is swung out. That is, the rotary cylinder 85 is in a shortened state, the groove 71 on one side of the rotary bracket 70 is engaged with the top boom pin 51 of the top boom 50, and is locked by the first lock device 6. At the same time, the groove 83 of the second lever 82 engages with the rotation support pin 52 of the top boom 50.

[0008] Next rotating cylinder 85 rotating bracket portion 70 and extending the rotates about the top boom pin 51, the other side pin hole 72 of the rotational bracket portion 70 as shown in FIG. 1 2 other top boom 50 Side pin hole 53
To match. The pin hole 72 and the pin hole 53 are locked by the second lock device 7 to complete the overhang.

[0009]

However, in the above arrangement, when the jib is swung to engage the groove of the second lever with the rotation support pin of the top boom, the second lever is connected to the first lever by a spring. In this case, the position of the groove of the second lever is unstable, and the rotation support pin and the groove interfere with each other and may not be easily engaged.
Further, if the extension force of the rotary cylinder is not applied, the groove may come off from the rotation support pin of the top boom. Further, it may be difficult to align the pin hole on the other side of the rotating bracket with the pin hole on the other side of the top boom, and there is a problem that much time and labor is required for the engagement.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and when the jib is swung out and overhanged, the engaging portion between the top boom and the rotating bracket can be easily engaged. It is an object of the present invention to provide a crane jib overhang and storage device which can overhang and store the jib with little labor.

[0011]

In order to achieve the above object, in a jib overhanging and retracting device for a crane according to the present invention, a boom is mounted on a vehicle so as to be able to move up and down, and the boom extends and contracts in multiple stages. A rotatable bracket part to be attached to and detached from the boom, and a rotatable jib are provided on the rotatable bracket part. A jib overhang installed and stored, a jib overhang of a crane equipped with a storage device, a rotating bracket portion for detaching or connecting the jib and the top boom in the storage device, and a pin fixed to the upper surface of the rotating bracket portion at one end. A first link rotatably mounted on the first link;
A second link having one end rotatably attached to the other end of the first link, a lock cylinder extending and connecting one end in the left-right direction of the top boom and the rotating bracket portion, and the lock cylinder A third link rotatably fixed to the second link and rotatably connected to the other end of the second link; and a rotary cylinder having the one end connected to the rotating bracket portion and the other end connected to the first link. Configuration.

In the above jib overhanging and retracting device for a crane, the rotating bracket portion has a pin hole connected to one of the left and right sides of the base end thereof and one of the left and right sides of the tip of the top boom by a vertical connecting pin. The top end of the top boom is provided with pin holes on the other side on the left and right sides of the base end to be connected to the other side on the left and right sides by vertical connection pins.

In the above jib overhanging and storing device for a crane, the other end of the second link is provided with a pin hole which is connected to the third link and one of the left and right ends of the top boom by vertical connecting pins. Configuration.

In the crane jib overhanging and retracting device described above, the lock cylinder is engaged with the rear end of the cylinder and the distal end of the piston rod, respectively, with the pin holes on the left and right sides of the base end of the rotating bracket. And a connecting pin which is engaged with a pin hole at the other end of the second link at a distal end of a third link rotatably mounted on the cylinder.

In the crane jib overhanging and retracting device described above, a position adjusting means for positioning the connecting pin of the third link at a predetermined position when the rotary cylinder is shortened is provided.

In the crane jib extension and storage device described above, the position adjustment for adjusting the relative position between the rotating bracket portion and the boom when the rotating bracket portion is rotated and extended toward the front of the boom. Means are provided.

[0017]

With the above construction, the position of the pin hole (fifth through pin hole) at the other end of the second link is stably fixed, and the jib stored side by side on the side of the boom is stored. When swinging out, the engaging portion between the top boom and the rotating bracket portion can be easily engaged. Further, when the rotary cylinder is extended to rotate the rotary bracket with respect to the boom and the jib is shortened, the connecting pin (second connecting pin) of the third link and the engaging portion (fifth through pin) of the rotary bracket portion are used. hole)
Can be easily adjusted by the position adjusting means (adjustment bolt 28). When the rotary cylinder is extended and the rotary bracket is rotated with respect to the boom, and the jib is extended, when the top boom (the top boom fourth pin and the top boom fifth pin) is engaged with the engagement portion (the fourth boom fifth pin). The three through-pin holes and the fourth through-pin holes can be easily aligned and locked by the position adjusting means (the upper adjusting bolt 17a and the lower adjusting bolt 17b).

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a crane according to the present invention.

FIG. 1 is a plan view of the rotating bracket portion 20 and the top boom 11 of the multi-stage boom 4, and shows a state in which the jib 8 is stored side by side on the side of the multi-stage boom 4. FIG. 2 shows the rotating bracket 20 and the top boom 1.
1 is a perspective view of a jib, showing a configuration of a jib overhang and storage device.

In FIG. 1 and FIG.
The top boom first pin hole 12a and the top boom second pin hole 12b are provided at the top on one side surface in the left-right direction of the tip of the first boom 1 (the side surface near the boom tip when the jib and the boom are juxtaposed).
Is fixed, and a guide 13 a is fixed to the upper surface of the bracket 12. Also, a bracket 14 having a top boom third pin hole 14a at a lower portion.
Are fixed, and a guide 13 b is fixed to the lower surface of the bracket 14. A bracket 15 having a top boom fourth pin hole 15a and an upper adjustment bolt 17a is fixed to the upper side of the other side surface of the top end of the top boom 11 (the side of the far end of the boom when the jib and the boom are juxtaposed). The top boom fifth pin hole 16a and the lower adjustment bolt 1
A bracket 16 having 7b is fixed.

On the upper side of one side of the base end of the rotating bracket portion 20, there are provided forked brackets 21a and 21b having a first through pin hole 21c which engages with the top boom first pin hole 12a of the top boom 11. Bifurcated bracket 21
A cylindrical member 22a is fixed to the upper surface of the member a. Also,
In the lower part, the top boom third pin hole 1 of the top boom 11
4a, a forked bracket 23a, 23b having a second through-pin hole 23c for engaging with the forked bracket 23 is provided.
A cylindrical member 22b is fixed to the lower surface of b. On the other upper side of the base end of the rotating bracket 20, a third through-pin hole 24c that engages with the top boom fourth pin hole 15a of the top boom 11, and forked brackets 24a and 24b having an upper stopper 26a are provided. At the lower part, a fourth boom engaging with the top boom fifth pin hole 16a of the top boom 11 is provided.
Bifurcated brackets 25a and 25b having a through pin hole 25c and a lower stopper 26b are provided.

One end of a first link 32 is rotatably mounted on the first pin 31 fixed to the upper surface of the rotating bracket portion 20, and one end of a second link 34 is connected to the other end by a second pin 33. Have been. The other end of the second link 34 has a fifth
Forked bracket 35a, 35 having through pin hole 35c
b is provided. The third pin 37 fixed to the upper surface of the rotating bracket portion 20 and the center of the first link 32 are connected by a rotating cylinder 36. An adjustment bolt 28 is attached to a bracket 27 provided on the upper surface of the rotating bracket section 20.

FIG. 3 is a side view of the lock cylinder 40, and the rotating bracket 20 shown in FIG.
FIG. 3 is a partial cross-sectional view in a state of swinging out with respect to FIG. FIG.
Is a partial cross-sectional view of the rear end of the lock cylinder 40,
Further, FIG. 5 A of the lock cylinder 40 - is a A cross-sectional view. 2 and 3 show a state in which the lock cylinder 40 is shortened. In FIG. 4, the lock cylinder 4
A third link 42 is rotatably mounted on the rear end of the cylinder 41, and a first connecting pin 43 that engages with the first through-pin hole 21c of the rotating bracket 20 is provided at the rear thereof. While being inserted into the end, the fourth pin 49
a. A third link 42 is rotatably sandwiched between the first connection pin 43 and the rear end of the cylinder 41. Further, as shown in FIG. 5, a rotation preventing member 48a is fixed to the outer periphery of the cylinder 41 in order to prevent the cylinder 41 from rotating while the rotating bracket portion 20 is rotating. The rotation preventing member 48a is provided with a slit Q in a U-shape, and the plate member 20a of the rotating bracket portion 20 is inserted between the slits Q. The second linking pin 44 that engages with the fifth through-hole 35c at the other end of the second link 34 is fixed to the tip of the third link 42. A flange portion 46 is provided at the distal end of the piston rod 45 of the lock cylinder 40, and a third connecting pin 47 that engages with the second through-pin hole 23c of the rotating bracket portion 20 is fixed to the distal end by a fifth pin 49b. I have. Further, a rotation preventing member 48b is fixed to the outer periphery of the cylinder 41 in order to prevent the piston rod 45 from rotating during rotation of the rotating bracket portion 20. Detent member 48
A slit Q is provided in b as described above, and a plate member 20a of the rotating bracket portion 20 is inserted between the slits Q. In a state where the lock cylinder 40 is shortened, the tip of the cylinder 41 comes into contact with the upper surface of the stopper 29 fixed to the rotating bracket 20, and the tip of the first connecting pin 43 engages with the forked bracket 21 b of the rotating bracket 20. And does not penetrate the first through pin hole 21c. The tip of the second linking pin 44 at the tip of the third link 42 is engaged with the forked bracket 35b of the second link 34, and does not penetrate the fifth through-pin hole 35c. The rear end of the flange portion 46 of the piston rod 45 has a stopper 29
Of contact with the lower surface, the tip of the third connecting pin 47 is engaged as engagement shown in FIG. 3 bifurcated bracket 23 a of the rotary bracket 20, does not penetrate the second through pin holes 23c. In this state, the rotating bracket 20, the first link 32,
The second link 34 and the third link 42 are connected,
A four-bar link is formed, and the first link 32 is
At 6, the rotary bracket 20 is positioned. Therefore, even if the rotating bracket part 20 separates from the top boom 11, the positional relationship between the links does not change. Also, 4
The position of the node link is determined by the cylinder stroke (distance between cylinder pins) of the rotary cylinder 36, and the position of the first link 32 is adjusted by adjusting the cylinder stroke with the adjustment bolt 28. Thereby, the top boom first pin hole 12a and the top boom second pin hole 12b
And the positions of the first connecting pin 43 and the second connecting pin 44 can be matched.

Next, the operation will be described. When the jib 8 is extended over the top boom 11, the jib 8 is laterally swung by the lateral holding device 5 as described with reference to FIG. 9 . FIG. 6 is a plan view showing a relationship between the rotating bracket portion 20 and the top boom 11 in a state where the jib 8 is swung out, and FIG. 3 is a partial sectional view of a side surface of the lock cylinder 40 in that state. That is, the bracket 12 and the bracket 14 of the top boom 11 are respectively inserted into the forked brackets 21a and 21b and the forked brackets 23a and 23b of the rotating bracket part 20, and the top boom first pin hole 12a and the top boom third pin 14a are respectively provided.
Are aligned with the first through-pin holes 21c and the second through-pin holes 23c, respectively. If the position shifts, bracket 1
The guide 13a provided on the bracket 2 and the guide 13b provided on the bracket 14 guide the cylindrical member 22a provided on the forked bracket 21a and the cylindrical member 22b provided on the forked bracket 23b to be positioned at predetermined locations. . At the same time, the bracket 12 of the top boom 11 is inserted into the forked brackets 35a and 35b of the second link 34. When the rotary cylinder 36 is shortened, the first link 32 is in contact with the adjustment bolt 28,
The length of 8 is adjusted such that the fifth through-pin hole 35c of the second link 34 and the second pin hole 12b of the top boom of the bracket 12 of the top boom 11 are aligned. Therefore, the top boom second pin hole 12b of the top boom 11 and the fifth through pin hole 35c of the second link 34 are aligned.

[0025] Then lock cylinder 4 as shown in FIG. 7
0, the first connecting pin 43 and the second connecting pin 44
The top boom first pin hole 12a, the first through pin hole 21c and the top boom second pin hole 12b, the fifth
The rotating bracket portion 20 and one side of the top boom 11 are connected by passing through the through pin hole 35c and the third connecting pin 47 through the top boom third pin hole 14a and the second through pin hole 23c.

[0026] Turning now to extend the rotating cylinder 36 8
As shown in FIG.
, And the bracket 15 and the bracket 16 on the other side of the top boom 11 are
0 is inserted into the forked brackets 24a and 24b and the forked brackets 25a and 25b on the other side. Then, the stoppers 26a and 26b of the rotating bracket portion 20 abut against the upper adjustment bolt 17a and the lower adjustment bolt 17b provided on the brackets 15 and 16 of the top boom 11. At this time, the top boom fourth pin hole 15a is
The length of the upper adjustment bolt 17a and the lower adjustment bolt 17b is adjusted so that the fourth adjustment pin 4c and the fifth pin hole 16a of the top boom are aligned with the fourth through-hole 25c.

Next, the top boom 11 and the other side of the rotating bracket portion 20 are locked by a locking device (not shown), and the extension of the jib 8 is completed.

[0028] Since the hydraulic hose (not shown) in the lock cylinder 4 0 is Toritsui, stopping member 48a so as not to rotate, 48b are mounted to the rotating bracket portion 20. Therefore, the lock during jib rotating cylinder 4 0 in the same manner as the rotating bracket 20 top boom 1
The first boom rotates around the first pin hole 12a.
Further, the position of the third link 42 does not move relative to the top boom 11 during the jib rotation. For these reasons,
The third link 42 is rotatably mounted in the lock cylinder 4 0 but, alternatively, the third link if rotatably lock cylinder 4 0 with respect to the rotational bracket portion 20 42 lock cylinder 4 0 May be fixed. At this time, it is necessary to remove a hydraulic hose (not shown) from the top boom 11.

[0029]

Since the present invention has a configuration as described in detail above, the position of the through-pin hole of the second link when the rotary cylinder is shortened is fixed, and one side of the boom and one side of the rotary bracket when the jib is swung out. The side pin holes are aligned so that they can be easily connected. In addition, the rotating cylinder is extended to rotate the rotating bracket with respect to the boom, and when the jib is overhanged, the positions of the other side of the boom and the other side of the rotating bracket are easily aligned, and the overhanging work can be easily shortened. A crane jib overhang and storage device that can be performed in time is obtained.

[Brief description of the drawings]

FIG. 1 is a plan view showing a jib retracted state of a jib overhang and storage device of the present invention.

FIG. 2 is a perspective view of the jib overhang and storage device of the present invention.

FIG. 3 is a side view showing a shortened state of a lock cylinder of the jib overhang and storage device of the present invention.

FIG. 4 is a partial sectional view of a rear end portion of the lock cylinder.

FIG. 5 is a sectional view of the lock cylinder taken along line BB.

FIG. 6 is a plan view showing the jib extended state of the jib overhanging and storage device of the present invention.

FIG. 7 is a side view showing an extended state of a lock cylinder of the jib overhang and storage device of the present invention.

FIG. 8 is a plan view showing a jib overhang state of the jib overhang and storage device of the present invention.

FIG. 9 is a plan view of a traveling state of a conventional vehicle-mounted crane.

FIG. 10 is a plan view showing a jib retracted state of a conventional jib overhang and storage device.

FIG. 11 is a plan view showing a conventional jib swinging state.

FIG. 12 is a plan view showing a conventional jib overhang state.

[Explanation of symbols]

11 top boom, 12, 14, 15, 16 bracket, 12a top boom first pin hole, 12b top boom second pin hole, 13a, 13b guide, 14a
… Top boom third pin hole, 15a… Top boom fourth
Pin hole, 16a: Top boom fifth pin hole, 17a: Upper adjustment bolt, 17b: Lower adjustment bolt, 20: Rotating bracket part, 21a, 21b, 23a, 23b, 24
a, 24b, 25a, 25b, 35a, 35b: bifurcated bracket, 21c: first through pin hole, 23c: second through pin hole, 24c: third through pin hole, 25c: fourth through pin hole, 22a, 22b ... Cylindrical members, 26a, 26b, 2
9 Stopper, 28 Adjustment bolt, 31 First pin, 3
2: 1st link, 33: 2nd pin, 34: 2nd link,
35c: fifth through-pin hole, 36: rotary cylinder, 37 ...
3rd pin, 40: lock cylinder, 41: cylinder, 4
2 3rd link, 43 1st connection pin, 44 2nd connection pin, 45 ... piston rod, 46 ... flange part, 47
... A third connecting pin.

Claims (6)

(57) [Claims] 1. A rotating bracket portion detachably attached to a boom, and a jib movable up and down on the rotating bracket portion are provided at a tip of a boom that is mounted on the vehicle so as to be able to move up and down and expands and contracts in multiple stages, and the rotating bracket portion is attached to the boom. By pivoting the boom, it protrudes forward of the boom at the time of work, and at the time of storage, a jib overhang which is juxtaposed and stored on the side of the boom, a jib overhang of a crane provided with a storage device, and a jib and a top boom. A rotating bracket portion for detaching or connecting the first bracket, a first link rotatably mounted at one end to a pin fixed to an upper surface of the rotating bracket portion,
A second link having one end rotatably attached to the other end of the first link, a lock cylinder extending and connecting one end in the left-right direction of the top boom and the rotating bracket portion, and the lock cylinder A third link rotatably mounted on the second link and rotatably connected to the other end of the second link, and a rotary cylinder having one end connected to the rotating bracket portion and the other end connected to the first link. A crane jib overhang and containment device. 2. The crane jib overhanging and retracting device according to claim 1, wherein said rotating bracket portion is connected to one of the left and right sides of the tip of the top boom and the right and left sides of the tip of the top boom by connecting pins in the vertical direction. A crane jib overhang and stowage, comprising a pin hole for connection, and a pin hole on the other left and right side of the base end for connection with the left and right other side of the tip of the top boom by a vertical connection pin. apparatus. 3. The crane jib overhanging and retracting device according to claim 1, wherein the other end of the second link is connected to the left and right sides of the tip of the third link and the top boom by a vertical connecting pin. A crane jib overhang and storage device, characterized in that the crane has a pin hole. 4. The crane jib overhanging and retracting device according to claim 1, wherein the lock cylinder is provided at a rear end of the cylinder and at a front end of the piston rod, respectively, on one side of the base end of the rotating bracket. A connection pin that engages with a pin hole, and a connection pin that engages with a pin hole at the other end of the second link at a tip end of the third link rotatably mounted on the cylinder. Features crane jib overhang and storage. 5. The jib overhang and storage device according to claim 1, further comprising a position adjusting means for positioning the connecting pin of the third link at a predetermined position when the rotary cylinder is shortened. A crane jib overhang and containment device. 6. A crane according to claim 1, wherein the relative position between the rotating bracket and the boom is adjusted when the rotating bracket is rotated and extended forward of the boom. A crane jib overhanging and storage device provided with a position adjusting means for performing the operation.