JPH07215659A - Holding device for construction machine - Google Patents

Abstract

PURPOSE:To provide a holding device, which can increase a degree of freedom of the attitude change in a material to be carried, by changing the attitude of a material to be carried in relation to a holding device during the carrying of the material to be carried. CONSTITUTION:A holding device provided with forks 8, 9, which can be freely opened and closed, is fitted to the tip of a boom of a construction vehicle. The tip of the forks 8, 9 are provided with holding parts 21, 22 for abutting on the outside surface of a material A to be carried under the condition that the material A to be carried is hold. The holding parts 21, 22 are provided with a rotating board 26, which can be freely rotated in relation to the forks 8, 9 under the condition that the holding parts 21, 22 abut on the outside surface of the material A to be carried. Under the condition that the holding condition of the material A to be carried by the forks 8, 9 is maintained, posture of the material A to be carried can be changed by the rotation of the material A to be carried around a shaft crossing the holding surface of the material A to be carried, and a large degree of freedom of the attitude change of the material A to be carried can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding device for a construction machine, and more particularly, to an improvement of a device for holding a secondary concrete product or the like when it is carried.

[0002]

2. Description of the Related Art Conventionally, transportation and installation work of concrete secondary products (for example, pedestrian road boundary blocks, U-shaped grooves, etc.) as transported goods at construction sites, road construction sites, etc.
It is known to be done by human power or construction machinery. When this work is performed manually, a large number of manpower is required and the work efficiency is low. Therefore, it is preferable to use a construction machine for this kind of work. Then, as a disclosure of the work using this construction machine, the actual Kaihei 5-302
There is No. 39 publication. More specifically, as shown in FIG. 10, the shovel car boom a has a holding device b at the tip of the boom a, which can hold a carried object c, and the carrying device c is held by the holding device b. It is moved to carry and install the goods c. Further, in such a state, as an operation for changing the carrying attitude of the carried object c, the operation of rotating the boom a and the connecting portion of the boom a and the holding device b are provided. There is a rotation operation of the holding device b accompanying the turning of the turning ring d.
That is, in the state as shown in FIG. 10, the posture of the conveyed object c can be changed in the direction of the arrow F by the rotation operation of the boom a, and the conveyance operation by the rotation about the rotation axis G can be performed by the rotation operation of the holding device b. The posture of the object c can be changed.

[0003]

By the way, when the object c is to be installed on the ground in the state where the object c is held as described above, the object c should be in a posture parallel to the ground e. There is a case where it is dropped and installed in a state, or a case where it is dropped and installed in a state of standing upright on the ground e. However, at the time of these installation operations, as described above, as the means for changing the posture of the conveyed object c, only by the rotating operation of the boom a and the holding device b, the conveyed object c is placed in an appropriate posture with respect to the ground e. It was difficult to install in.
That is, as shown in FIG. 11, in a state in which the conveyed object c is held by the holding device b in a tilted state, the conveyed object c is made parallel or upright with respect to the ground e only by the above-described operation. It was difficult to drop in the state. Therefore, in order to install the transported article c at an appropriate position from such a held state, fine adjustment such as the rotating operation of the boom a is required, and it takes a long time to install the transported article c. It was supposed to.

The present invention has been made in view of this point, and an object of the present invention is to obtain a structure capable of installing a transported object in an appropriate position in a short time.

[0005]

In order to achieve the above-mentioned object, the present invention provides a holding part attached to the tip of a fork of a holding device that abuts against a carried object when it is held. The fork was made to be rotatable, so that the posture could be changed by rotation while the transported object was being held between the holding portions at the tip of the fork. Specifically, the invention according to claim 1 is a fork that is connected to a boom tip of a construction machine and holds the transported object by opening and closing, a holding section attached to the fork tip, and a driving means that opens and closes the fork. And a holding device for a construction machine, in which each of the holding parts is brought into contact with the outer surface of the carried object to hold the carried object between the holding parts when the fork holds the carried object. . Further, the holding section is provided with a rotation holding means that is rotatable about an axis perpendicular to the outer surface of the object to be conveyed while being in contact with the outer surface.

According to a second aspect of the present invention, in the holding device for a construction machine according to the first aspect, the holding portion is provided with a rotation range limiting means for limiting the rotation range of the rotation holding means within a predetermined angle range. It has such a configuration.

According to a third aspect of the present invention, in the holding device for a construction machine according to the first aspect, the holding portion is provided with a rotation prohibiting means for prohibiting the rotation of the rotary holding means.

According to a fourth aspect of the present invention, there is provided a holding device for a construction machine according to the first aspect, wherein the holding portion has an axis parallel to an outer surface of a conveyed object in which the holding portion contacts the tip of the fork. Supporting means having a rotating shaft which is rotatably supported around the center and extends in a direction orthogonal to the outer surface of the transported object is provided, and the rotating holding means is rotatably supported by the rotating shaft. .

[0009]

With the above construction, the present invention provides the following actions. According to the first aspect of the present invention, in the transportation and installation work of the transported object, first, the driving means is driven to open and close the pair of forks, and the holding portion attached to the tip of the forks is attached to the outer surface of the transported object. The object to be carried is held between the respective holding portions in a state of being brought into contact with each other. Then, in this held state, the transported object is transported to a predetermined position by an operation such as raising the boom. And at this time,
Since the holding portion is provided with a rotating holding means,
The carrying object can be rotated with respect to the fork in a state where the carrying object is held by each of the holding parts, and thus the degree of freedom in changing the posture of the carrying object in the carrying state can be increased.

According to the second aspect of the present invention, when the posture change due to the rotation of the transported object is required to be regulated, the rotation range regulating means regulates the rotation range of the rotation holding means within a predetermined angle range. Will be done. This prevents the transported object from rotating more than necessary.

According to the third aspect of the present invention, when the posture change due to the rotation of the transported object is not required, the rotation prohibiting means prohibits the rotation of the rotation holding means. As a result, the holding device for a construction machine according to the present invention can be used in the same usage state as the conventional holding device in which the carried object is held in a state of not being rotated.

According to the fourth aspect of the present invention, in the state of holding the conveyed object, the rotary holding means is in contact with the outer surface of the conveyed object. Further, since the support means that supports the rotary gripping means is rotatable with respect to the tip of the fork, the support means is swingable with the rotary gripping means integrally with the fork. Therefore, the front surface of the rotary holding means can be along the outer surface of the transported object, and a large contact area of the rotary clamp means with the outer surface of the transported object can be secured.

[0013]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows a construction vehicle 2 provided with a holding device 1 according to the present invention. The construction vehicle 2 has the same structure as a well-known shovel car except for the holding device 1. In FIG. 1, 2a is a vehicle body, 2b is a track as a traveling device, 2c is a driver's seat, and 2d is a boom. The boom 2d is composed of first and second booms 2e and 2f. The first boom 2e is pivotally supported such that its base end portion is rotatable around a horizontal axis with respect to the vehicle body 2a, and the first boom 2e and the vehicle body 2 are supported.
A first hydraulic cylinder S1 is installed between a and a.
Therefore, the first boom 2e is rotatable with respect to the vehicle body 2a as the first hydraulic cylinder S1 is driven. On the other hand, the second boom 2f is pivotally supported so as to be rotatable around a horizontal axis with respect to the tip of the first boom 2e at a lower position with a predetermined dimension from the upper end in the state of FIG. A second hydraulic cylinder S2 is installed between the upper end of the two boom 2f and the first boom 2e. Therefore, the second boom 2f is rotatable with respect to the first boom 2e as the second hydraulic cylinder S2 is driven.

At the tip of the second boom 2f, there is provided a holding device 1 which is a device characteristic of this embodiment. Hereinafter, the holding device 1 will be described. The present holding device 1 holds a transported object A (see FIG. 1) such as a rectangular parallelepiped concrete secondary product from the outside, and is connected to a second boom 2f as shown in FIG. It is provided with the connecting means 3 and the holding means 4 for holding the transported article A.

The connecting means 3 comprises a connecting bracket 5, a pivot bearing 6 and a holding means mounting bracket 7. As shown in FIGS. 2 to 4, the connecting bracket 5 is composed of a pair of plate members that are erected on the upper surface of the swivel bearing 6 and face each other, and include a main plate 5a and a sub plate 5b joined to the inner surface of the main plate 5a. And consists of.
A first connecting hole 5c is opened at the upper end of the main plate 5a, while a second connecting hole 5d is opened at the tip of the sub plate 5b. Then, a support shaft (not shown) is inserted into the second connection hole 5d, and the support shaft pivotally supports the connection bracket 5 at the tip of the second boom 2f (see FIG. 1). Also, the first connecting hole 5c
Includes a third hydraulic cylinder S supported by the second boom 2f.
One end of the piston rod of 3 is connected,
By driving the hydraulic cylinder S3, the connecting means 3, and thus the entire holding device 1, can be rotated about a horizontal axis with respect to the second boom 2f. A hydraulic motor (not shown) is provided on the upper surface of the swivel bearing 6 near the standing position of the connecting bracket 5.

The swivel bearing 6 is provided with an outer ring 6a and an inner ring 6b, and a bearing (not shown) is interposed between the both rings 6a and 6b.
The inner ring 6b is rotatable with respect to the outer ring 6a. Further, a ring gear (not shown) that meshes with a gear arranged on the drive shaft of the hydraulic motor is provided around the inner ring 6b, and the inner ring 6b and thus the holding means mounting bracket 7 and The holding means 4 is configured to rotate with respect to the boom 2d. Further, the holding means attaching bracket 7 is a pair of plate members attached to the lower surface of the inner ring 6b and hung from the lower surface, and as shown in FIG. It is set up. The upper part of the holding means 4 is located in the space between the holding means mounting brackets 7, 7.

As shown in FIG. 2, the holding means 4 includes a pair of first and second forks 8 and 9 and a fork support bracket 1.
Equipped with 0 etc. The first and second forks 8 and 9 are members that are substantially V-shaped when viewed from the side, and are arranged to face each other. Further, the lower side positions of the forks 8 and 9 having a predetermined size from the upper ends thereof are rotatably supported by a pair of fork supporting brackets 10 and 10 arranged on both sides of the forks 8 and 9, respectively. . Further, at the upper end of the first fork 8 located on the right side in FIG.
A link portion 8a extending in a direction at a predetermined angle with respect to the extension direction of is integrally welded. A link rod 11 is installed between the lower end of the link portion 8a and the upper end of the second fork 9, and both ends of the link rod 11 are respectively relative to the lower end of the link portion 8a and the upper end of the second fork 9. It is connected so that various rotations are possible. Further, one end of a piston rod 12a of a hydraulic cylinder 12 arranged between the fork support brackets 10 is rotatably supported on the upper end of the link portion 8a.
The cylinder base end of the hydraulic cylinder 12 is connected to the fork support bracket 10. In this way, the driving means 35 according to the invention of claim 1 is configured. When the hydraulic cylinder 12 is driven and the piston rod 12a extends in the direction of arrow B in FIG. 2, the first fork 8 moves in the direction of arrow C around the rotation center O1 as the link portion 8a rotates. As the first fork 8 rotates, the link rod 11 is pushed in the direction of arrow D. And by the movement of this link rod 11,
The second fork 9 rotates in the direction of arrow E about the rotation center O2. In this way, the forks 8 and 9 rotate so as to approach each other, whereby the carried object A is held. Further, the operation of releasing the holding of the transported object A is the opposite of the above-described operation by the piston rod 12a being pulled in, and the forks 8 and 9 are rotated so as to be separated from each other. (See Figure 3). The feature of this example is the configuration of the holding portions 21 and 22 arranged at the tips of the forks 8 and 9, respectively. Less than,
The configuration of the holding portions 21 and 22 will be described in detail. As shown in FIG. 5, the holding portions 21 and 22 include a base member 23 pivotally supported by the tip ends of the forks 8 and 9. The base member 23 includes a pair of flange portions 23a, 23a (see FIG. 7) connected to the forks 8, 9 and the flange portion 2
A disc-shaped disc portion 23b extending in the vertical direction with respect to 3a is integrally formed. In the connection structure of the base member 23 and the forks 8 and 9, the tip portions of the forks 8 and 9 are the flange portions 23a of the base member 23,
23a, each of the flange portions 23
bolts B1 having male threads formed at both ends are inserted through bolt holes (not shown) formed at the lower ends of the a and 23a and the tips of the forks 8 and 9, respectively, and nuts are provided at both ends of the bolts B1. By screwing N1 and N1,
The base member 23 is linked to the forks 8 and 9. Further, the diameter of a bolt hole (not shown) formed at the tip of the forks 8 and 9 is slightly larger than the diameter of the bolt B1, and between the bolt B1 and the forks 8 and 9. A bush 24 is interposed between the bushes. As a result, the base member 23 is supported rotatably (swinging) with respect to the forks 8 and 9, and the holding portions 21 and 22 are supported.
When the carrying object A is being held by the
The conveyed article A can be held in a state where the conveyed articles A and 22 are rotated to a position along the surface shape of the conveyed article A.

Further, the base member 2 is attached to the forks 8 and 9.
Arc-shaped openings 8b and 9b centering on the rotation axis of 3 (position of the bolt B1) are formed. The flange portion 2 of the base member 23 is provided in the openings 8b and 9b.
A bolt B2 inserted through a bolt hole (not shown) formed at the upper end of 3a is inserted, and nuts N2, N2 are screwed into the tip of the bolt B2. As a result, the rotation range of the base member 23 with respect to the forks 8 and 9 is regulated within the range in which the bolt B2 abuts on both ends of the arc-shaped openings 8b and 9b in the longitudinal direction. A rotary disk 26, which serves as a rotary holding means in the present invention, is supported on the inner surface of the disk portion 23b via a rotary shaft member 25. The rotating member 25 is the base member 2
The third disc portion 23b has a small-diameter disc portion 25a overlapped with it and a rotary shaft 25b protruding from the center of the disc portion 25a. Then, the turntable 26 has the rotating shaft 25b.
It is fitted in and is rotatable about the rotation shaft 25b.

The structure of the rotary disk 26 will be described. The rotary disk 26 comprises a sleeve 26a fitted to the rotary shaft 25b and a rotary base disk 26b fitted to the outer peripheral portion of the sleeve 26a. A flange 26c is formed on the outer peripheral edge of the rotary base plate 26b so as to extend toward the opposing fork. For this reason, the flange 26c and the sleeve 26a form a groove 26d having a substantially U-shaped cross-section that opens toward the facing fork in the circumferential direction around the rotary shaft 25b of the rotary shaft member 25. Then, as shown in FIG.
A ring-shaped contact member 26e made of urethane is integrally fitted in a groove 26d having a U-shaped cross section formed by the flange 26c and the sleeve 26a. The surface of the abutting member 26e that comes into contact with the transported object A is set to a position projecting from the end surface of the sleeve 26a and the end surface of the flange 26c of the rotary base plate 26b, and the state in which the transported object A is held is held. Then, only the abutting member 26e is brought into contact with the transported article A. A bush 27 is interposed between the rotary shaft 25b of the rotary shaft member 25 and the sleeve 26a, and a thrust washer 28 is interposed between the disc portion 25a of the rotary shaft member 25 and the sleeve 26a. . As a result, the turntable 26 smoothly rotates with respect to the rotary shaft member 25. Further, a disk 29 for preventing the sleeve from coming off is attached to the tip of the rotary shaft 25b with a bolt B3.
In this way, since the turntable 26 is supported,
The turntable 26 is rotatable about a rotation shaft 25b of the rotation shaft member 25 as a rotation center. With such a structure, the base member 23 and the rotary shaft member 25 form the supporting means 36 in the invention of claim 4.

Further, the holding parts 21 and 22 are the rotary disc 2
The rotation of 6 is prohibited, and the rotatable range thereof is restricted. First, a configuration for prohibiting the rotation of the turntable 26 will be described. As shown in FIG. 7, a semicircular cutout portion 23c is formed in the peripheral portion of the disc portion 23b of the base member 23 so as to face each other across the center of the disc portion 23b. . A sleeve 30 for inserting a bolt is fitted in the cutout portion 23c in an integrated manner. On the other hand, turntable 2
The rotary base board 26b of No. 6 is provided with a female screw 26f at a position that can face the position where the sleeve 30 is provided (see FIG. 5). That is, by setting the turntable 26 at a predetermined rotation position, the sleeves 30, 30 and the female screws 26f, 2
The positions of 6f are made to coincide with each other. Then, in such a state, the bolt B4 is inserted into the sleeve 30 and the bolt B4 is screwed into the screws 26f and 26f, whereby the turntable 26 is integrally connected to the base member 23. That is, in this state, the turntable 26 cannot rotate. With such a configuration, the female screw 26f, the sleeve 30, and the bolt B4
The rotation prohibiting means 37 is constituted by.

Next, a structure for restricting the rotatable range of the turntable 26 will be described. As shown in FIGS. 5 and 7, a stopper 31 protruding toward the outer peripheral side is integrally attached to a part of the outer peripheral portion of the base member 23. The stopper 31 is arranged between the disc portion 23b of the base member 23 and the rotary base plate 26b of the rotary disc 26 so as not to come into direct contact with the rotary disc 26. On the other hand, on the back surface of the rotating base board 26b,
Restricting members 32, 32 that are detachable by bolts B5, B5, ... Are provided at two positions at a predetermined angular interval α with respect to the center of the rotary base board 26b. Then, in a state where the restricting members 32, 32 are attached to the back surface of the rotary base plate 26b, the stoppers 31 are positioned on the movement loci of the restricting members 32, 32 as the rotary plate 26 rotates. For this reason, the rotatable range of the turntable 26 is restricted to a position where the restriction members 32, 32 come into contact with the stopper 31. That is, the turntable 26 can be rotated only within the range in which the stopper 31 moves within the angle α in FIG. 7. With such a configuration, the stopper 31 and the restriction member 32 form a rotation range restriction unit 38.

Next, the connecting structure of the holding means mounting bracket 7 and the fork supporting bracket 10 will be described. Elastic holding members 13 are arranged at a total of eight positions of the holding means mounting bracket 7 in the vertical direction at the left and right edges of the holding means mounting bracket 7 in FIG. 7 and the fork support bracket 10 are connected. That is, as shown in FIG. 4, the pair of holding means mounting brackets 7 and the fork support bracket 10 are connected by the eight elastic connecting members 13, 13, .... The elastic connecting member 13 will be described in detail. As shown in FIG. 4, nuts (not shown) are embedded in the vicinity of the left and right end surfaces of the flat cylindrical rubber member 13a, and one of the nuts is formed on the holding means mounting bracket 7. Placed opposite to the opened opening,
The other is arranged so as to face an opening formed in the fork support bracket 10, and bolts B6 and B6 are screwed into and fastened to the respective openings. As a result, the entire holding means 4 is elastically supported by the holding means mounting bracket 7 and by extension the boom 2d. That is, the transported article A held between the forks 8 and 9 is also elastically held by the construction vehicle 1. As a result, the impact given to the object A from the ground as the boom 2d descends is mitigated, and damage to the object A is avoided.

Another feature of the gripping device 1 of the present embodiment is that the gripping device 1 has a structure for preventing shaking in the horizontal direction (horizontal direction in FIG. 2) and has a carrying object A having a specified weight or more. It has a structure to detect. First,
A configuration for preventing horizontal shaking will be described. Protruding pieces 14 extending in the up-down direction with predetermined dimensions are provided at both upper and lower ends of the fork supporting bracket 10 in the widthwise central portion. Further, stopper members 15, 15 extending from the inner wall surface of the holding means mounting bracket 7 toward the fork supporting bracket 10 are provided at positions close to the left and right sides of the respective projecting pieces 14.
With such a configuration, the holding means 4 is configured so that the elastic connecting member 13
When a large amount of rocking is attempted in the left-right direction in FIG. 2 due to deformation, the protruding piece 14 abuts either of the left and right stopper members 15 so that the rocking amount is regulated. The transportation operation of the object A can be stably performed.

Next, a structure for detecting that the carried object A having a weight equal to or more than the specified weight is held will be described. The protruding piece 14
For example, a red paint is applied to the outer end surface of the one located on the upper side. On the other hand, a rectangular detection window 16 having a small opening is formed at a substantially central portion in the width direction of the holding means mounting bracket 7. This detection window 16
In the state in which the forks 8 and 9 are not holding the conveyed object A or the conveyed object A having a weight equal to or less than the specified weight, the formation position of The outer end surface of the piece 14 is set at a position where it cannot be seen from the detection window 16, that is, a position slightly lower than the protruding piece 14. Therefore, when the carrying object A having a weight equal to or more than the specified weight is held, the outer end surface of the protruding piece 14 reaches the detection window 16 and the outer end surface of the red protruding piece 14 can be seen from the detection window 16 so that the carried object A is held. The operator can recognize that the carried object A has a specified weight or more. Therefore, when the transported object A exceeds the specified weight, the operator recognizes that and stops the transportation work, and damage of the elastic connecting member 13 can be avoided. .

Further, the structure for detecting that the carried object A having a weight exceeding the specified weight is not limited to the structure provided with the detection window 16 as described above, and a conventionally known limit switch, photoelectric switch or the like can be used. It may be configured so that the weight of the transported object can be detected by electrical means.

Next, the work of carrying the goods A by the construction vehicle 2 having the above-mentioned structure will be described. In particular, the construction vehicle 2 of this example is used for transporting and installing a pedestrian road boundary block and a U-shaped groove, and the transportation and installation work of the pedestrian road boundary block and the U-shaped groove Since the operation is different from the transportation and installation work, each operation will be described.

First, the transportation and installation work of the pedestrian road boundary block will be described. As the transportation and installation work of this pedestrian road boundary block, first, the pedestrian road boundary blocks arranged in a state of being laid sideways in the block storage area are shown in FIG.
As shown in FIG. 5, the blocks A1, A1, ... Are installed upright along a predetermined block installation position with a space corresponding to the length dimension of the block A1. Then, from this state, the blocks A1, A1, ...
1, A1, ... are installed horizontally at predetermined installation positions.

The case where this operation is performed by the main construction vehicle 2 will be described. At this time, the bolt B4 for prohibiting the rotation of the turntable 26 as described above is removed, and the restricting member 32 is provided. , 32 are removed from the rotary base plate 26b, and the rotary plate 26 is allowed to freely rotate without restricting the rotation of the rotary plate 26 or the rotatable range. Then, in such a state, first, the construction vehicle 2 is moved to the block storage space. At this time, in the hydraulic cylinder 12, the piston rod 12a is in the most retracted state, and the forks 8 and 9 are in the farthest positions, that is, in the open non-holding state (see FIG. 3). From this state, the first to third hydraulic cylinders S1 to S3 are driven so that one walkway boundary block A1 is located between the forks 8 and 9.

Thereafter, when the hydraulic cylinder 12 is driven to extend the piston rod 12a in the direction of arrow B in FIG. 2, the first fork 8 rotates in the direction of arrow C, and the first fork 8 is rotated.
With the rotation of the fork 8, the link rod 11 is pushed in the direction of arrow D, and the second fork 9 rotates in the direction of arrow E. In this way, as the forks 8 and 9 rotate, the holding portions 21 and 22 of the forks 8 and 9 come into contact with the outer side surfaces of the block A1, and the block A1 is held. In addition, the holding position of the block A1 by the holding portions 21 and 22 at this time is set to a position displaced in the longitudinal direction from the center of gravity of the block A1. Then, while holding the block, the first to third hydraulic cylinders S1 to S3 are driven again to rotate the boom 2d upward to lift the block A1. When the block A1 is lifted in this way, as described above, the block A1 is lifted.
The holding position of No. 1 is set at a position displaced in the longitudinal direction from the position of the center of gravity of the block A1.
Since the second rotary disks 26, 26 are rotatable while holding the block A1, the block A1 is in a posture such that the center of gravity is located below the holding position. That is, the block A1 is in the standing state from the sideways lying state while being held by the holding portions 21 and 22.
In this standing state, it is transported to a predetermined installation position by the movement of the predetermined boom 2d or the movement of the construction vehicle 2.

After the block A1 is transported to the predetermined installation position, when the block A1 is installed in the predetermined position, first, the first to third hydraulic cylinders S1 to S are installed.
3 is driven to rotate the boom 2d downward.

Then, the block A1 held in the upright state is erected on the ground in the upright state (as shown in FIG. 8), and the block A1 is placed on the ground.
The operation of the boom 2d is stopped. Then, after the block A1 is placed on the ground in this way, the piston rod 12a is pulled in, whereby the operation opposite to the above-described operation is performed, and the forks 8 and 9 are rotated in the directions away from each other. The holding state of the block A1 is released, and this installation work is completed. By repeating such an operation, as shown in FIG. 8, a plurality of blocks A1 are erected in a standing state along a predetermined block installation position with an interval of a length dimension of the blocks A1. It will be in the installed state, and from this state the block A
By tilting 1 along the predetermined block installation position, the blocks A1, A1, ... Are installed horizontally at the predetermined installation position and aligned in a straight line. Since the pedestrian road boundary block A1 is transported and installed by such work, the block A1
Can be easily installed by the construction vehicle 2 in a standing position at a predetermined position, and the construction vehicle 2 can specially perform the work of changing the standing state of the block A1 from the sideways position, which was conventionally performed manually. It can be performed with high work efficiency without requiring a large drive source. Further, in the operation of transporting and installing the block A1 of this kind, in addition to the operation of tilting the block A1 to the predetermined position after the block A1 is installed in the standing state, the block A1 is installed in the predetermined state while being held by the holding portions 21 and 22. Even if it is installed in a horizontal position, the turntable 26
Since it is rotatable, the posture of the block A1 can be easily changed by human power. Therefore, the posture of the block A1 along the inclination of the road surface can be easily obtained, the amount of position adjustment after installation is small, and the work efficiency can be improved. Also, in the case of such behavior,
The holding position of the block A1 by the holding portions 21 and 22 is set as close to the center of gravity of the block A1 as possible. When holding such a position, the posture of the block A1 can be changed with a small amount of human power.

Next, the transportation and installation work of the U-shaped groove will be described. When carrying and installing this U-shaped groove,
As described above, the bolt B4 for prohibiting the rotation of the turntable 26 is removed, and the restricting members 32, 32 are attached to the rotary base plate 26b to restrict the rotatable range of the turntable 26. deep. This is especially true for U
This is because the groove is a heavy object (for example, 200 kg per piece), and if it is rotated more than necessary, it may adversely affect the surroundings. Then, in such a state, as shown in FIG. 9, one side extending in the vertical direction in the U-shaped groove A2 is held by the holding portions 21 and 22. Also in this case, the holding position of the U-shaped groove A2 by the holding portions 21 and 22 is set as close to the position of the center of gravity of the U-shaped groove A2 as possible so that the posture of the U-shaped groove A2 can be changed with a little human power. Keep it. Then, from this state, the U-shaped groove A2 is conveyed by rotating the boom 2d, and the U-shaped groove A2 is conveyed.
Is horizontally installed at a predetermined installation position in a groove dug in the ground. At this time, since the turntable 26 of the holding portions 21 and 22 can rotate within a predetermined range while holding the U-shaped groove A2, the posture of the rotating disk 26 is changed in accordance with this rotation so that the groove is dug in the ground. It will be installed in this groove in an appropriate posture according to the inclination and the like.

As described above, according to this example,
A turntable 26, 2 rotatable at the tip of each fork 8, 9
6 is provided, and with the rotation of the turntables 26, 26, the posture can be changed by rotating the conveyed object A while maintaining the held state of the conveyed object A. For this reason, it is possible to change the posture due to the rotation of the transported article A about the axis orthogonal to the holding surface of the transported article A, which is not obtained in the conventional configuration, and the posture change of the transported article A is possible. Since it is possible to obtain a high degree of freedom, it is possible to install the transported article A at an appropriate position in a short time.

The base member 23 is rotatably (pivotally) supported with respect to the forks 8 and 9, and when the carrying object A is held by the holding portions 21 and 22, the holding portion is held. Since the carried object A can be held in a state in which the carried objects 21 and 22 are rotated to a position along the surface shape of the carried object A, the holding parts 21 and 22 make contact with the outer surface of the carried object A. A large area can be secured and a high gripping force can be obtained.

Since the rotation inhibiting means 37 is provided, the state in which the transported article A is rotatably supported is
It is possible to obtain a state in which the transported article A is supported so as not to rotate as in the conventional case, as required.

Further, by providing the rotation range restricting means 38, it is possible to restrict the transported article A from rotating more than necessary in response to a request.

In this example, a rectangular parallelepiped concrete secondary product has been described as an example of the object to be conveyed, but the present invention is not limited to this, and it can be used for conveying various objects such as fume pipes and cast iron pipes. Can be used.

[0038]

As described above, according to the present invention, the following effects are exhibited. According to the first aspect of the present invention, the gripping portion is provided with the rotary gripping means that is rotatable about an axis perpendicular to the outer surface of the object being brought into contact with the outer surface. When transporting a transported object, the transported object can be rotated with respect to the fork while the transported object is being held by each of the holding parts, so that the posture of the transported object in the transported state can be changed with great freedom. You can Therefore, the transported object can be installed at an appropriate position in a short time.

According to the second aspect of the invention, the holding portion is provided with
Since the rotation range restricting means for restricting the rotation range of the rotation holding means within the predetermined angle range is provided, it is possible to prevent the transported article from rotating more than necessary in response to a request.

According to the third aspect of the invention, the holding portion is provided with
Since the rotation restricting means for restricting the rotation of the rotary gripping means is provided, the rotation of the carried object can be restricted according to the request, and the carried object can be rotatably supported by the single holding device for the construction machine. It is possible to obtain a state in which the article is supported and a state in which the article is supported so as not to rotate as in the conventional case.

According to the fourth aspect of the invention, the holding portion is
A supporting means having a rotary shaft that is rotatably supported around an axis parallel to the outer surface of the object to which the holding portion is in contact with the tip of the fork and extends in a direction orthogonal to the outer surface of the object; Since the rotary gripping means is rotatably supported on the rotary shaft, the front surface of the rotary gripping means can be aligned with the outer surface of the object to be carried along with the rotation of the supporting means. It is possible to secure a large contact area with respect to the outer surface of the transported object and to obtain a high gripping force.

[Brief description of drawings]

FIG. 1 is a side view of a construction vehicle.

FIG. 2 is a front view of the holding device showing a state in which the fork is closed.

FIG. 3 is a front view of the holding device showing a state in which the fork is opened.

FIG. 4 is a side view of the holding device showing a state where the carried object is held.

FIG. 5 is a cross-sectional view showing a part of each holding part.

FIG. 6 is a rear view of the holding section.

FIG. 7 is a front view of a holding portion.

FIG. 8 is a diagram for explaining transportation and installation work of a pedestrian road boundary block.

FIG. 9 is a view for explaining a U-shaped groove transportation and installation work.

FIG. 10 is a view corresponding to FIG. 1 in a conventional example.

FIG. 11 is a side view of a gripping device showing a state in which a conveyed product is held in an inclined state in a conventional example.

[Explanation of symbols]

 1 Holding Device 2 Construction Vehicle (Construction Machinery) 2d Boom 8 First Fork 9 Second Fork 21,22 Holding Part 25b Rotating Shaft 35 Drive Means 36 Supporting Means 37 Rotation Prohibiting Means 38 Rotation Range Restricting Means A Transported Goods

Claims (4)

[Claims] 1. A fork that is connected to a boom end of a construction machine and that opens and closes to hold a transported object; a holding unit that is attached to the end of the fork; and a drive unit that opens and closes the fork. In a holding device for a construction machine, wherein when holding a carried object, each holding part is brought into contact with the outer surface of the carried object so as to hold the carried object between the respective holding parts, A holding device for a construction machine, comprising: a rotating and holding means that is rotatable about an axis orthogonal to the outer surface while being in contact with the outer surface. 2. The holding device for a construction machine according to claim 1, wherein the holding portion is provided with a rotation range limiting means for limiting the rotation range of the rotation holding means within a predetermined angle range. 3. The holding device for a construction machine according to claim 1, wherein the holding portion is provided with rotation prohibiting means for prohibiting rotation of the rotary holding means. 4. The gripping portion is rotatably supported around an axis parallel to the outer surface of the object on which the tip of the fork is in contact, and is perpendicular to the outer surface of the object. The holding device for a construction machine according to claim 1, further comprising a support means having a rotation shaft extending to the rotation shaft, the rotation holding device being rotatably supported by the rotation shaft.