JP7309491B2 - Attachments and construction machinery - Google Patents

Description

The present invention relates to an attachment that can be attached to the front end of a boom of a construction machine, and a construction machine equipped with the attachment.

Patent Literature 1 discloses, as a construction machine, a crane including a traveling vehicle body and a revolving body. In this crane revolving structure, the rear end of the boom is attached to the revolving base, and the boom can be raised and lowered with respect to the revolving base. In this crane, a jib having a short longitudinal dimension is detachably connected as an attachment to the boom head at the front end of the boom. With the attachment (short jib) connected to the boom head, rotating the attachment relative to the boom about the position of connection to the boom head raises or lowers the attachment relative to the boom.

Japanese Patent No. 5531769

When using an attachment such as a short jib as in Patent Literature 1, it is required to reduce labor and the like in the work of connecting the attachment to the front end portion of the boom. That is, it is required that the attachment can be easily connected to the front end of the boom.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problem, and its object is to provide an attachment that can be easily connected to the front end of a boom, and a construction machine equipped with the attachment. .

In order to achieve the above object, one aspect of the present invention provides an attachment attachable to the front end of a boom in a construction machine provided with a boom, the attachment extending longitudinally from the rear side to the front side, an arm connectable at its rear end to the front end of the boom, wherein the arm rotates with respect to the boom about a connection position to the front end of the boom, thereby raising or an arm to lay down, a shaft provided at the front end of the arm and extending along the width direction of the arm intersecting both the longitudinal direction of the arm and the bending direction of the arm, and a first handle end. and a second handle end, the handle extending along the handle longitudinal direction from the first handle end to the second handle end, the second handle end being connectable to the shaft and, with the second handle end connected to the shaft, application of an operating force to the first handle end raises the arm relative to the boom; a handle capable of applying an action force from the end of the second handle to the arm via the shaft; and a relay member attached to the shaft rotatably about the shaft, The handle is connected to the shaft via the relay member, and is rotatable about the connection position to the relay member. By rotating about the connection position to the relay member, Stand up or lie down on the arm .

ADVANTAGE OF THE INVENTION According to this invention, the attachment which connection to the front-end part of a boom is easily performed, and a construction machine provided with the attachment can be provided.

FIG. 1 is a schematic diagram showing a crane according to the first embodiment. FIG. 2 is a perspective view schematically showing the boom head, the searcher hook, and the vicinity thereof according to the first embodiment in a state where the angle of the arm with respect to the boom is the first angle. FIG. 3 shows the boom head, the searcher hook, and the vicinity thereof according to the first embodiment. 1 is a perspective view schematically shown in a state of engagement with the . FIG. 4 is a perspective view schematically showing the boom head, the searcher hook, and the vicinity thereof according to the first embodiment in a state where the angle of the arm with respect to the boom is a second angle. FIG. 5 shows the boom head, the searcher hook, and the vicinity thereof according to the first embodiment. 1 is a perspective view schematically shown in a state of engagement with the . FIG. 6 is a perspective view schematically showing the searcher hook according to the first embodiment with the handle stored in the arm and the guide member stored in the handle. FIG. 7 is a perspective view schematically showing the searcher hook according to the first embodiment with the handle stored in the arm. 8 is a perspective view schematically showing a handle and a guide member according to the first embodiment; FIG. FIG. 9 is a perspective view schematically showing the handle according to the first embodiment; FIG. FIG. 10 is a schematic diagram showing the handle according to the first embodiment as viewed from the side where the handle is raised. FIG. 11 is a schematic view of the handle according to the first embodiment as viewed from one side in the handle width direction. FIG. 12 is a schematic view of the state in which the handle according to the first embodiment is connected to the shaft of the arm, viewed from the side where the handle is raised. FIG. 13 is a schematic diagram showing a state in which the handle according to the first embodiment is connected to the shaft of the arm in the first connected state; FIG. 14 is a schematic diagram showing a state in which the handle according to the first embodiment is connected to the shaft of the arm in a second connected state; FIG. 15 is a schematic diagram showing a guide member according to the first embodiment; FIG. 16 shows a state in which the arm is connected to the boom head and the handle is connected to the shaft of the arm in the first connection state in the operation of connecting the searcher hook to the boom head according to the first embodiment. 1 is a schematic diagram; FIG. 17 is a schematic diagram showing a state in which the arm is raised from the state of FIG. 16 by applying an operating force to the handle, and the guide hook (first guide hook) of the guide member is engaged with the engaging piece of the arm; is. FIG. 18 is a schematic diagram showing a state in which each of the relay links is connected to the corresponding one of the attachment-side links from the state of FIG. 19 is a schematic diagram showing a state in which the handle and guide member are retracted and the hook is attached to the shaft from the state of FIG. 18. FIG. FIG. 20 schematically shows a state in which the relay link is disconnected from the corresponding one of the attachment-side links from the state of FIG. 19 and the handle is connected to the shaft in the second connection state. It is a diagram. FIG. 21 shows a state in which each of the relay links is removed from the corresponding one of the boom side links from the state of FIG. ) is engaged with the engaging piece of the arm. FIG. 22 is a schematic diagram showing a state in which one boom side link is connected to the corresponding one of the attachment side links from the state of FIG. FIG. 23 is a schematic diagram showing a state in which the relay link, handle and guide member are retracted from the state of FIG. 22 and the hook is attached to the shaft.

An embodiment of the present invention will be described with reference to FIGS. 1 to 23. FIG.

(First embodiment)
FIG. 1 is a diagram showing a crane 1 of the first embodiment. As shown in FIG. 1 , a crane 1 as a construction machine includes a traveling vehicle body 2 and a revolving body 3 installed on the traveling vehicle body 2 . The revolving body 3 can revolve with respect to the traveling vehicle body 2 about a revolving shaft that is parallel or substantially parallel to the vertical direction. The traveling vehicle body 2 is provided with a pair of outriggers 5A at a front portion and a pair of outriggers 5B at a rear portion. The revolving structure 3 includes a revolving base 6 , an operator's cab 7 and a boom 8 . The swivel base 6 , cab 7 and boom 8 swivel together with respect to the traveling vehicle body 2 . In the driver's cab 7, the operator operates the crane 1 and the like.

The boom 8 has a front end (tip) and a rear end (base end), and extends along the longitudinal direction from the rear side (arrow C2 side) to the front side (arrow C1 side). A rear end (base end) of a boom 8 is attached to the swivel base 6 . The boom 8 can be raised and lowered with respect to the swivel base 6 . The hoisting direction of the boom 8 (directions indicated by arrows Y1 and Y2) intersects (is perpendicular or substantially perpendicular to) the longitudinal direction of the boom 8 (directions indicated by arrows C1 and C2). A boom head 17 is provided at the front end (tip) of the boom 8 . In this embodiment, the boom 8 is a multi-stage boom and can be extended and contracted in the longitudinal direction. In FIG. 1, the solid line indicates the state B1, and the broken line indicates the state B2 in which the boom 8 is lowered with respect to the state B1.

The outer surface of boom 8 has a boom top surface 13 and a boom bottom surface 15 . The boom upper surface 13 faces the side where the boom 8 rises (arrow Y1 side), and the boom lower surface 15 faces the side where the boom 8 lays down (arrow Y2 side). Moreover, the crane 1 of this embodiment includes a jib 10 . The jib 10 has a rear end (proximal end) and a front end (distal end) and extends longitudinally from the rear side to the front side. In FIG. 1, the jib 10 is shown retracted along the boom underside 15 . The longitudinal direction of the jib 10 is parallel or substantially parallel to the longitudinal direction of the boom 8 when the jib 10 is stored on the boom lower surface 15 , that is, when the jib 10 is held under the boom 8 . When the jib 10 is stored on the boom lower surface 15, the front side of the jib 10 matches or substantially matches the rear side of the boom 8, and the rear side of the jib 10 matches or substantially matches the front side of the boom 8. .

Moreover, a pair of tension rods 11A and 11B are provided in the crane 1 of this embodiment. One end (front end) of each of the tension rods 11A and 11B is connected to the jib 10 . When the jib 10 is stored on the boom lower surface 15, the tension rods 11A and 11B are also stored along the boom lower surface 15 together with the jib 10.例文帳に追加Further, in the crane 1 , a searcher hook 20 is detachably connected to the boom head 17 as an attachment separate from the jib 10 . In this embodiment, the searcher hook 20 can be attached to the boom head 17 when the jib 10 is stored on the boom lower surface 15 .

2 to 5 show the boom head 17 (the front end of the boom 8) and its vicinity with the searcher hook 20 connected to the boom head 17. FIG. Here, the width direction of the boom 8 (arrows W1 and direction indicated by arrow W2). As shown in FIGS. 1 to 5, etc., the outer surface of the boom 8 includes boom side surfaces 16A and 16B. The boom side surfaces 16A and 16B face outward in the width direction of the boom 8 and face opposite sides in the width direction of the boom 8 .

A top sheave 25 , a rooster sheave 27 and a guide sheave 31 are arranged on the boom head 17 . Top sheave 25 is attached to boom head 17 via shaft 26 and rooster sheave 27 is attached to boom head 17 via shaft 28 . Also, the guide sheave 31 is attached to the boom head via a shaft 32 . Each of the shafts 26 , 28 , 32 extends parallel or substantially parallel to the width direction of the boom 8 . The guide sheave 31 and shaft 32 are located on the side where the boom 8 rises, that is, on the side closer to the boom upper surface 13 with respect to the top sheave 25 , the rooster sheave 27 and the shafts 26 and 28 . Also, the rooster sheave 27 and shaft 28 are located on the front side of the boom 8 with respect to the top sheave 25 , guide sheave 31 and shafts 26 and 32 .

In the operation of the crane 1, a hook (main hook) 19 may be used to hoist a load. In this case, a rope (main hoisting rope) 18 extends from a winch (not shown) of the swivel base 6 , and the rope 18 extends from the rear side to the front side on the boom upper surface 13 . The rope 18 is hung on the top sheave 25 and the hook 19 is suspended from the top sheave 25 via the rope 18 .

In the boom head 17, a shaft 32 for a guide sheave 31 is connected to one end (rear end) of a pair of boom side links 35A and 35B. One end of the boom side link 35A is connected to the shaft 32 on the boom side surface 16A, and one end of the boom side link 35B is connected to the shaft 32 on the boom side surface 16B. Each of the boom side links 35A, 35B is rotatable around the shaft 32. As shown in FIG. Each of the boom side links 35A and 35B rotates about the shaft 32 to move toward or away from the boom head 17 (the front end of the boom 8) from the front side of the boom 8. As shown in FIG.

Further, the boom head 17 is provided with link receivers 38A and 38B. The link receivers 38A and 38B are located on the side of the shaft 32 on which the boom 8 lays down, that is, on the side closer to the boom lower surface 15 . The boom side link 35A can be engaged with the link receiver 38A, and the boom side link 35B can be engaged with the link receiver 38B. Each of the boom-side links 35A, 35B comes closest to the boom head 17 when engaged with one of the link receivers 38A, 38B. Also, one of the connecting pins 39A, 39B can be attached to each of the link receivers 38A, 38B. When the boom side link 35A is engaged with the link receiver 38A, the connecting pin 39A is attached to the link receiver 38A, thereby restricting the rotation of the boom side link 35A about the shaft 32, thereby preventing the boom side link 35A from rotating. Stored in the boom head 17 . Similarly, when the boom-side link 35B is engaged with the link receiver 38B, the connecting pin 39B is attached to the link receiver 38B, thereby restricting the rotation of the boom-side link 35B about the shaft 32. A link 35B is stored in the boom head 17. As shown in FIG.

When the jib 10 is arranged on the boom lower surface 15 , that is, when the jib 10 is held against the boom 8 , the jib 10 is positioned at one or more points on the rear side of the boom head 17 . is connected to the boom 8 at . When the jib 10 is used, the rear end of the jib 10 is connected to the shaft 26 for the top sheave 25 of the boom head 17 while the jib 10 is held under the boom 8 . The rear end of jib 10 is connected to shaft 26 on each of boom sides 16A, 16B. Then, the connection of the jib 10 to the boom 8 at locations other than the shaft 26 is released. This allows the jib 10 to rotate about the shaft 26 with respect to the boom 8 .

Also, when the jib 10 is in use, each of the tension rods 11A, 11B is connected to a corresponding one of the boom side links 35A, 35B. As a result, each of the tension rods 11A, 11B is connected to the boom head 17 via corresponding one of the boom side links 35A, 35B. When the jib 10 is used, with the connecting body between the tension rod 11A and the boom side link 35A and the connecting body between the tension rod 11B and the boom side link 35B stretched between the boom head 17 and the jib 10, The jib 10 is rotated about the shaft 26. - 特許庁This raises or lowers the jib 10 relative to the boom 8 .

6 and 7 are diagrams showing a searcher hook 20 which is an attachment. As shown in FIGS. 1 to 7 and the like, the searcher hook 20 includes an arm 21, a pair of attachment-side links 37A and 37B, and a hook 22. As shown in FIGS. The arm 21 has a front end (distal end) and a rear end (base end), and extends longitudinally from the rear side (arrow C4 side) to the front side (arrow C3 side). The longitudinal dimension of the arm 21 is smaller than the longitudinal dimension of the jib 10 . In the searcher hook 20 (arm 21), the width direction (direction indicated by arrow W3 and arrow W4) intersecting (perpendicular or substantially perpendicular) to the longitudinal direction (direction indicated by arrow C3 and arrow C4) of arm 21 is defined. When the searcher hook 20 is connected to the boom head 17, the width direction of the searcher hook 20 (arm 21) matches or substantially matches the width direction of the boom 8 (directions indicated by arrows W1 and W2).

The arm 21 has a pair of pillars 51A and 51B, and each of the pillars 51A and 51B extends continuously from the rear end to the front end of the arm 21 . The pillars 51A and 51B are arranged apart from each other in the width direction of the arm 21 . An arm foot 52A is formed at the rear end of the column 51A, and an arm foot 52B is formed at the rear end of the column 51B. Further, one corresponding one of the foot pins 33A, 33B can be attached to each of the arm feet (arm connecting portions) 52A, 52B.

When using the searcher hook 20, the shaft 28 for the rooster sheave 27 of the boom head 17 is engaged with the arm feet 52A, 52B. With the arm foot 52A engaged with the shaft 28, the foot pin 33A is attached to the arm foot 52A, and with the arm foot 52B engaged with the shaft 28, the foot pin 33B is attached to the arm foot 52B. Thereby, the rear end of the arm 21 is connected to the shaft 28 for the rooster sheave 27 of the boom head 17 . Arm foot 52A is connected to shaft 28 at boom side 16A and arm foot 52B is connected to shaft 28 at boom side 16B. By connecting the arm 21 to the boom head 17 via the shaft 28 as described above, the searcher hook 20 is rotatable about the shaft 28 with respect to the boom 8 .

The searcher hook 20 is raised or lowered relative to the boom 8 by rotating the searcher hook 20 about the shaft 28 . The undulating direction (direction indicated by arrows Y3 and Y4) of the searcher hook 20 (arm 21) intersects (perpendicularly or substantially perpendicularly) the longitudinal direction of the arm 21, and the arm 21 (searcher hook 20) It intersects (perpendicular or substantially perpendicular to) the width direction. As described above, by raising or lowering the searcher hook 20 with respect to the boom 8 , the angle (offset angle) θ of the longitudinal direction of the arm 21 with respect to the longitudinal direction of the boom 8 changes. Also, the outer surface of the arm 21 has an upper arm surface 43 and an lower arm surface 45 . The arm upper surface 43 faces the side where the searcher hook 20 rises (arrow Y3 side), and the arm lower surface 45 faces the side where the searcher hook 20 lays down (arrow Y4 side).

The arm 21 of the searcher hook 20 is connected to the boom head 17 via the shaft 28, and the boom side links 35A and 35B are connected to the boom head 17 via the shaft 32, as described above. Therefore, with respect to the connection position of the searcher hook 20 (arm 21) to the front end of the boom 8, the connection position of the boom side links 35A and 35B to the front end of the boom 8 is on the side where the boom 8 rises, that is, It is located on the side close to the boom upper surface 13 .

In addition, in the present embodiment, the searcher hook 20 has a state in which the angle θ of the arm 21 with respect to the boom 8 is the first angle θ1, and a second state in which the angle θ of the arm 21 with respect to the boom 8 is different from the first angle θ1. can be used in a state where the angle θ2 is of the arm 21 with respect to the boom 8 is the second angle .theta.2, the searcher hook 20 is raised with respect to the boom 8 compared to the case where the angle .theta. of the arm 21 with respect to the boom 8 is the first angle .theta.1. In the state B1 of FIG. 1 and the state of FIG. 2, the angle θ of the arm 21 with respect to the boom 8 is the first angle θ1. In the state B2 of FIG. 1 and the state of FIG. 4, the angle θ of the arm 21 with respect to the boom 8 is the second angle θ2.

In the searcher hook 20, one end (front end) of the attachment side link 37A is connected to the front end of the post 51A, and one end (front end) of the attachment side link 37B is connected to the front end of the post 51B. The connection positions of the attachment-side links 37A and 37B to the arm 21 are located on the front side of the arm 21 with respect to the arm feet 52A and 52B. Each of the attachment-side links 37A, 37B is connected to the arm 21 via corresponding one of the connection pins 55A, 55B.

A shaft 47 extends from the arm 21 between the pillars 51A and 51B. The shaft 47 extends along the width direction of the arm 21 . In the arm 21 , the shaft 47 is arranged on the front side with respect to the connecting pins 55A and 55B (connection positions of the attachment-side links 37A and 37B to the arm 21) and provided at the front end of the arm 21. As shown in FIG. The hook 22 is connected to the shaft 47 via a pivot link 48 . Hook 22 is detachably connected to pivot link 48 via connecting pin 49 .

The searcher hook 20 also includes a pair of relay links 36A and 36B. One end (rear end) of each of the boom side links 35A and 35B is connected to the shaft 32 of the boom head 17 as described above. Each of the relay links 36A, 36B is detachably connected to the corresponding one other end (front end) of the boom side links 35A, 35B.

When the searcher hook 20 is used with the arm 21 at the first angle θ1 with respect to the boom 8, each of the relay links 36A and 36B is connected to one of the boom side links 35A and 35B. be. Each of the boom-side links 35A, 35B is connected to the arm 21 via corresponding ones of the relay links 36A, 36B and corresponding ones of the attachment-side links 37A, 37B. Therefore, when the searcher hook 20 is used with the arm 21 at the first angle θ1 with respect to the boom 8, the boom side link 35A, the relay link 36A, and the attachment side link 35A, the relay link 36A, and the attachment side link 35A are placed between the boom head 17 and the arm 21. The connecting body of the link 37A and the connecting body of the boom side link 35B, the relay link 36B and the attachment side link 37B are stretched. At this time, the boom side link 35A is connected to the relay link 36A via the connecting pin 39A, and the boom side link 35B is connected to the relay link 36B via the connecting pin 39B. The attachment side link 37A is connected to the relay link 36A via a connecting pin 66A, and the attachment side link 37B is connected to the relay link 36B via a connecting pin 66B.

On the other hand, when the searcher hook 20 is used with the arm 21 at the second angle θ2 with respect to the boom 8, the relay links 36A and 36B are not attached to the boom side links 35A and 35B. Each of the boom side links 35A and 35B is connected to the arm 21 via only one corresponding one of the attachment side links 37A and 37B. Therefore, when the searcher hook 20 is used with the arm 21 at the second angle θ2 with respect to the boom 8, the boom side link 35A and the attachment side link 37A are connected between the boom head 17 and the arm 21. The body and the connecting body of the boom side link 35A and the attachment side link 37B are in a state of being stretched. At this time, the boom side link 35A is connected to the attachment side link 37A via the aforementioned connecting pin 39A, and the boom side link 35B is connected to the attachment side link 37B via the aforementioned connecting pin 39B.

6 and 7, the attachment-side links 37A and 37B can be retracted into the arm 21 when the searcher hook 20 is not in use. When the attachment-side link 37A is stored in the arm 21, the attachment-side link 37A is connected to the column 51A via the connecting pin 55A, and is also attached to the column 51A via the foot pin 33A. When the attachment-side link 37B is stored in the arm 21, the attachment-side link 37B is connected to the column 51B via the connection pin 55B, and is also attached to the column 51B via the foot pin 33B. . When the attachment-side links 37A, 37B are stored in the arm 21, the foot pins 33A, 33B are positioned on the rear side of the arm 21 with respect to the connection pins 55A, 55B. 6 and 7, the attachment-side links 37A and 37B are shown in a state of being housed in the arm 21. As shown in FIG.

In arm 21, engagement pieces 58A, 65A, and 68A are formed on column 51A, and engagement pieces 58B, 65B, and 68B are formed on column 51B. The engagement pieces 65A, 65B are arranged on the rear side of the arm 21 with respect to the connection pins 55A, 55B (connection positions of the attachment-side links 37A, 37B to the arm 21). Also, when the attachment-side links 37A, 37B are stored in the arm 21, the engagement pieces 65A, 65B are arranged on the rear side of the arm 21 with respect to the foot pins 33A, 33B. Also, the engaging pieces 68A and 68B are arranged on the rear side with respect to the engaging pieces 65A and 65B, and are arranged on the front side with respect to the arm foots 52A and 52B. Also, in the arm 21, the engaging pieces 58A and 58B are arranged on the rear side with respect to the engaging pieces 65A and 65B, and arranged on the front side with respect to the engaging pieces 68A and 68B.

The relay links 36A, 36B can be stored in the arm 21 when the relay links 36A, 36B are not used. When the relay link 36A is stored in the arm 21, the relay link 36A is attached to the engaging piece 65A via the connecting pin 66A and engages with the engaging piece 68A. When the relay link 36B is stored in the arm 21, the relay link 36B is attached to the engaging piece 65B via the connecting pin 66B and engages with the engaging piece 68B. When the attachment-side links 37A, 37B and the relay links 36A, 36B are stored in the arm 21, the relay links 36A, 36B are positioned on the rear side of the arm 21 with respect to the attachment-side links 37A, 37B. 4 and 6, the relay links 36A, 36B are shown retracted into the arm 21. FIG.

As shown in FIGS. 3 and 5-7, the searcher hook 20 includes a handle 70 and a guide member 71. As shown in FIGS. 8 shows the handle 70 and the guide member 71, and FIGS. 9-11 show the handle 70. FIG. Here, the handle 70 has a first handle end E1 and a second handle end E2, and the handle 70 defines a handle longitudinal direction (directions indicated by arrows C5 and C6). The handle 70 extends along the handle longitudinal direction from the first handle end E1 to the second handle end E2. The side on which the first handle end E1 is positioned in the handle longitudinal direction is the front side of the handle 70 (arrow C5 side), and the side on which the second handle end E2 is positioned in the handle longitudinal direction is the rear side of the handle 70 (arrow C6). side). Further, in the handle 70, a handle width direction (directions indicated by arrows W5 and W6) that intersects (perpendicular or substantially perpendicular) with respect to the longitudinal direction of the handle is defined. 11, the handle 70 is shown as viewed from one side in the handle width direction.

The handle 70 includes posts 72-76, 77A and 77B. The post 72 forms the first handle end E1 of the handle 70 and extends along the handle width direction. Further, each of the pillars 73 and 74 is arranged in the central portion of the handle 70 in the handle longitudinal direction and extends along the handle width direction. The column portion 74 is located on the side closer to the second handle end E2 with respect to the column portion 73, that is, on the rear side of the handle 70. As shown in FIG. The column portion 75 extends rearward along the handle longitudinal direction from the column portion 72 to the column portion 73 . The column portion 76 extends rearward from the column portion 73 to the column portion 74 along the longitudinal direction of the handle. A virtual central plane of the handle 70 in the handle width direction passes through the pillars 75 and 76 .

Each of the pillars 77A and 77B extends rearward from the pillar 73 along the longitudinal direction of the handle. The posts 77A, 77B form the second handle end E2 of the handle 70. As shown in FIG. The posts 77A, 77B are spaced apart from each other in the handle width direction, and the virtual center plane of the handle 70 in the handle width direction passes between the posts 77A, 77B. Further, the column portion 74 extends along the handle width direction between the column portions 77A and 77B. Also, the pillars 77A and 77B of the handle 70 can be connected to the shaft 47 at the second handle end (handle rear end) E2.

3, 5 and 12-14 show the handle 70 connected to the shaft 47 of the arm 21. FIG. 3, 5, 12 to 14, etc., when the handle 70 is connected to the shaft 47 of the arm 21, the handle width direction of the handle 70 corresponds to the width direction of the arm 21 (arrow W3 and arrow W3). W4) match or substantially match. A pair of relay members 81A and 81B are attached to the shaft 47, as shown in FIGS. The relay members 81A and 81B are arranged apart from each other in the width direction of the arm 21, and the rotary link 48 is arranged between the relay members 81A and 81B in the width direction of the arm 21. As shown in FIG. Each of the relay members 81A and 81B is rotatable around the shaft 47. As shown in FIG.

In the handle 70, the column portion 77A is connected to the shaft 47 via the relay member 81A, and the column portion 77B is connected to the shaft 47 via the relay member 81B. A pair of plate-like portions 82A and 83A are formed at the rear end portion of the column portion 77A forming the second handle end portion E2. The plate-like portions 82A and 83A are arranged apart in the handle width direction, and a gap is formed between the plate-like portions 82A and 83A. Similarly, a pair of plate-like portions 82B and 83B are formed at the rear end portion of the column portion 77B forming the second handle end portion E2. The plate-like portions 82B and 83B are arranged apart in the handle width direction, and a gap is formed between the plate-like portions 82B and 83B. In this embodiment, the plate-like portion 83A is arranged inside the plate-like portion 82A in the handle width direction, and the plate-like portion 83B is arranged inside the plate-like portion 82B in the handle width direction. The plate-like portions 82A and 83A are connected to the relay member 81A via a connecting pin 85A with the relay member 81A inserted into the gap between the plate-like portions 82A and 83A. Similarly, the plate-like portions 82B and 83B are connected to the relay member 81B via a connecting pin 85B with the relay member 81B inserted into the gap between the plate-like portions 82B and 83B.

By connecting the handle 70 to the shaft 47 via the relay members 81A and 81B as described above, the handle 70 is centered on the connection pins 85A and 85B, that is, the connection position to the relay members 81A and 81B. It becomes possible to rotate as The handle 70 is raised or laid down with respect to the arm 21 by rotating the handle 70 around the connecting position to the relay members 81A and 81B. The undulating direction of the handle 70 (the directions indicated by arrows Y5 and Y6) intersects (perpendicularly or substantially perpendicularly) the longitudinal direction of the handle and intersects (perpendicularly or substantially perpendicularly) the width direction of the handle. ). 10 and 12, the handle 70 is shown as viewed from the side where the handle 70 is raised (arrow Y5 side).

A plate-like portion 83A formed at the rear end portion of the column portion 77A is provided with protrusions 86A and 87A projecting rearward in the longitudinal direction of the handle. Similarly, a plate-like portion 83B formed at the rear end portion of the column portion 77B is provided with protrusions 86B and 87B projecting rearward in the longitudinal direction of the handle. The handle 70 is attached to the shaft 47 via the relay members 81A and 81B in a state where the protrusions (first protrusions) 86A and 86B are located on the side where the handle 70 rises with respect to the protrusions (second protrusions) 87A and 87B. concatenated. Also, the handle 70 can be connected to the shaft 47 in two connected states, a first connected state shown in FIG. 13 and a second connected state shown in FIG.

As shown in FIG. 13, in the first connected state, the portion between the projections 86A and 87A and the portion between the projections 86B and 87B can come into contact with the outer peripheral surface of the shaft 47. As shown in FIG. In the first connected state, the operator or the like applies an operating force to the column portion 72 of the first handle end portion E1 to rotate the handle 70 to the rising side about the connecting pins 85A and 85B. As a result, the portion between the protrusions 86A and 87A and the portion between the protrusions 86B and 87B are brought into contact with the shaft 47. As shown in FIG. Then, a force acting to raise the arm 21 with respect to the boom 8 acts on the arm 21 via the shaft 47 from the contact portion of the second handle end E2 of the handle 70 with the shaft 47 .

On the other hand, as shown in FIG. 14, in the second connected state, the portion of the projection 87A facing the side on which the handle 70 lays down (the arrow Y6 side) and the portion of the projection 87B facing the side on which the handle 70 lays down are located on the shaft 47. Contact with the outer peripheral surface becomes possible. Then, in the second connected state, the operator or the like applies an operation force to the column portion 72 of the first handle end portion E1 to turn the handle 70 to the lying down side about the connecting pins 85A and 85B. As a result, the portion of the projection 87A facing the side where the handle 70 lies down and the portion of the projection 87B facing the side where the handle 70 lies down come into contact with the shaft 47 . Then, due to the principle of leverage, the force acting to raise the arm 21 against the boom 8 acts on the arm 21 via the shaft 47 from the contact portion of the second handle end E2 of the handle 70 with the shaft 47. . Here, if the operating force applied to the column portion 72 is of the same magnitude, the acting force acting on the arm 21 to raise the arm 21 is greater in the second connected state than in the first connected state. .

Also, the handle 70 can be stored in the arm 21 . In the handle 70, a plate-like portion 91A is formed on the column portion 77A, and a plate-like portion 91B is formed on the column portion 77B. The plate-like portions 91A, 91B are arranged between the pillars 73, 74 in the longitudinal direction of the handle. When the handle 70 is stored in the arm 21, the plate-like portion 91A is attached to the arm 21 via the connecting pin 85A, and the plate-like portion 91B is attached to the arm 21 via the connecting pin 85B. When the handle 70 is stored in the arm 21, the connecting pins 85A and 85B are positioned on the rear side of the arm 21 with respect to the connection pins 55A and 55B (connection positions of the attachment-side links 37A and 37B to the arm 21). It is arranged on the front side of the arm 21 with respect to the engaging pieces 65A and 65B. Also, when the handle 70 is stored in the arm 21 , the column portion 72 of the handle 70 engages with the engagement pieces 58A and 58B of the arm 21 .

By retracting the handle 70 as described above, when the handle 70 is stored in the arm 21, the front side (first handle end E1 side) of the handle 70 is aligned with or substantially aligned with the rear side of the arm 21. The rear side of the handle 70 (the side of the second handle end E2) matches or substantially matches the front side of the arm 21 . Even when the handle 70 is stored in the arm 21 , the handle width direction of the handle 70 matches or substantially matches the width direction of the arm 21 .

An engagement piece 92 is formed on the column portion 76 of the handle 70 . When the handle 70 is stored in the arm 21, the engagement piece 92 is arranged on the rear side of the arm 21 with respect to the connection pins 55A and 55B and on the front side of the arm 21 with respect to the engagement pieces 65A and 65B. placed. As shown in FIG. 6 and the like, the hook 22 can be stored in the arm 21 together with the handle 70 when the searcher hook 20 is not used. When the hook 22 is stored, the hook 22 is engaged with the engaging piece 92 of the handle 70 and hooked on the engaging piece 92 .

15 shows the guide member 71. FIG. As shown in FIGS. 8 and 15, the guide member 71 has a first guide end E3 and a second guide end E4. along the guide axial direction (the directions indicated by arrows C7 and C8). The side on which the first guide end E3 is positioned in the guide axial direction is the front side (arrow C7 side) of the guide member 71, and the side on which the second guide end E4 is positioned in the guide axial direction is the rear side of the guide member 71. (Arrow C8 side).

The guide member 71 has bar portions 95 and 96 . The bar portion 95 forms a second guide end E4 and extends from the second guide end E4 toward the front side of the guide member 71 . The bar portion 96 forms a first guide end E3 and extends rearward of the guide member 71 from the first guide end E3. Further, in the guide member 71, a relay portion 97 is provided between the bar portions 95 and 96 in the guide axial direction. In the guide member 71, for example, when the bar portion 95 is rotated about the central axis of the guide member 71 with respect to the relay portion 97 by an operator or the like, the dimension of the relay portion 97 in the guide axial direction is changed. do. This changes the dimension of the guide member 71 in the guide axial direction.

In the guide member 71, a guide hook (first guide hook) 101A is attached to the bar portion 96 via a connecting pin 102A, and a guide hook (second guide hook) 101B is attached to the bar portion via a connecting pin 102B. 96. The guide hook 101A is rotatable about the connecting pin 102A, and the guide hook 101B is rotatable about the connecting pin 102B. In the guide member 71, the guide hook 101A is arranged on the front side, that is, on the side closer to the first guide end E3 with respect to the guide hook 101B.

Also, a regulation pin 103A can be attached to the guide hook 101A and the bar portion 96, and a regulation pin 103B can be attached to the guide hook 101B and the bar portion 96. As shown in FIG. Holes 105A and 106A are formed in the guide hook 101A, and holes 105B and 106B are formed in the guide hook 101B. By attaching the regulating pin 103A to the guide hook 101A and the bar portion 96 in a state where the regulating pin 103A is inserted through the hole 105A, the guide hook 101A is held at the engagement position, and the rotation of the guide hook 101A from the engagement position is prevented. movement is restricted. On the other hand, by attaching the regulating pin 103A to the guide hook 101A and the bar portion 96 in a state in which the regulating pin 103A is inserted through the hole 106A, the guide hook 101A is held at the non-engaging position and the non-engaging position of the guide hook 101A is maintained. Rotation from the position is restricted. The guide hook 101B can also be held at the engaging position and the non-engaging position by the regulating pin 103B in the same manner as the guide hook 101A.

Further, as shown in FIGS. 3 and 5, etc., the guide member 71 can be connected to the boom head 17 of the boom 8 . The guide member 71 is connected to the boom head 17 at the second guide end E4, ie the rear end of the bar portion 95. As shown in FIG. The guide member 71 is connected to the boom head 17 via a connecting pin 110 on the boom side surface 16A. The connection position of the guide member 71 to the front end of the boom 8 is the side where the boom 8 rises, that is, the top surface of the boom, with respect to the connection position (shaft 28) of the searcher hook 20 (arm 21) to the front end of the boom 8. Located close to 13. The connecting position of the guide member 71 to the front end of the boom 8 is the side on which the boom 8 lays down with respect to the connecting position (shaft 32) of the boom side links 35A and 35B to the front end of the boom 8, that is, the boom It is located on the side closer to the lower surface 15 .

When the guide member 71 is connected to the boom head 17 and the guide hook 101A is positioned at the engagement position, the guide hook 101A can engage with the engagement piece 68A of the arm 21. As shown in FIG. The guide hook 101A engages with the engagement piece 68A when the relay link 36A is not stored in the arm 21. As shown in FIG. By engaging the guide hook 101A with the engaging piece 68A, the arm 21 is set to the state where the angle (offset angle) θ with respect to the boom 8 becomes the first angle θ1, or the angle θ becomes the first angle θ1. It is held in a state slightly raised with respect to the boom 8 from the state. 3 shows a state in which the guide hook (first guide hook) 101A of the guide member 71 is engaged with the engagement piece 68A of the arm 21. FIG.

The guide hook 101B can be engaged with the engagement piece 68A of the arm 21 when the guide member 71 is connected to the boom head 17 and the guide hook 101B is positioned at the engagement position. The guide hook 101B engages with the engaging piece 68A when the relay link 36A is not stored in the arm 21. As shown in FIG. By engaging the guide hook 101B with the engaging piece 68A, the angle (offset angle) θ of the arm 21 with respect to the boom 8 becomes the second angle θ2, or the angle θ becomes the second angle θ2. It is held in a state slightly raised with respect to the boom 8 from the state. 5 shows a state in which the guide hook (second guide hook) 101B of the guide member 71 is engaged with the engagement piece 68A of the arm 21. FIG.

Further, as shown in FIGS. 6 and 8 and the like, the guide member 71 can be stored in the handle 70 . Therefore, the handle 70 with the guide member 71 retracted can be stored in the arm 21 . An engaging groove 111 is formed in the column portion 73 of the handle 70 . In the handle 70 of the present embodiment, an engaging groove 111 is formed at the end of the column portion 73 on the side where the column portion 77B is positioned in the handle width direction. When the guide member 71 is stored in the handle 70 , the bar portion 96 of the guide member 71 is inserted into the engagement groove 111 and the bar portion 96 is engaged with the engagement groove 111 . Further, when the guide member 71 is stored in the handle 70, the regulating pin 103B is attached to the bar portion 96 of the guide member 71 and the pillar portion 73 of the handle 70. 96 is prevented from coming off.

When the guide member 71 is stored in the handle 70, the regulation pin 103A is attached to the guide hook 101A and the bar portion 96 while being inserted through the hole 105A. Therefore, the guide hook 101A is held at the engaging position. When the guide member 71 is stored in the handle 70 , the guide hook 101A held at the engagement position engages with the column portion 72 of the handle 70 and is hooked on the column portion 72 .

One end of the wire 112 is connected to the first guide end (front end) E3 of the guide member 71 . When the second guide end E4 of the guide member 71 is connected to the boom head 17, an operator or the like applies an operating force to the wire 112 to rotate the guide member 71 about the connecting pin 110. For example, the guide member 71 is moved.

Next, the operation and effect of the searcher hook 20, which is the attachment of the present embodiment, and the crane 1, which is the construction machine, will be described. When using the searcher hook 20, the arm 21 is connected to the boom head 17 as previously described. Then, the boom side links 35A and 35B are connected to the arm 21, respectively. In the work using the searcher hook 20, as shown in FIG. The searcher hook 20 is used for hoisting a load in a working environment such as indoors where the sky is restricted. Here, in the searcher hook 20, the hook 22 is hung from the shaft 47 of the arm 21 only through the rotary link 48, and no rope or the like is used for hanging the hook 22. As shown in FIG. Therefore, even when hoisting a load in a work environment with a limited sky, the distance from the front end of the arm 21 to the lower end of the hook 22 is reduced, so that the lifting height of the crane 1 (from the ground to the lower end of the hook 22) is reduced. distance) is ensured to be large.

In addition, the searcher hook 20 of the present embodiment has a state in which the angle θ of the arm 21 with respect to the boom 8 is a first angle θ1 and a state in which the angle θ of the arm 21 with respect to the boom 8 is a second angle θ2. Available. For this reason, when using the searcher hook 20, the arm 21 with respect to the longitudinal direction of the boom 8 is adjusted to correspond to the working environment such as the height to the ceiling (T1 or T2, etc.) and the undulating state of the boom 8. , i.e., the hoisting condition of the searcher hook 20 with respect to the boom 8, is determined. At this time, the angle θ is determined so as to ensure the maximum lifting height of the crane 1 in accordance with the work environment and the undulating state of the boom 8 . For example, in a state B1 where work is performed indoors with a ceiling T1, the angle θ is set to the first angle θ1, and the searcher hook 20 is used to lift the suspended load A1. In addition, in state B2 where work is performed indoors with a ceiling T2 whose height from the ground is lower than the ceiling T1, the boom 8 is lowered compared to the state B1, the angle θ is set to the second angle θ2, and the searcher hook is operated. 20 is used to lift the suspended load A2.

Here, the work of connecting the searcher hook 20 to the boom head 17 (the front end of the boom 8) and the action of changing the angle θ of the arm 21 with respect to the boom 8 will be described. When the searcher hook 20 is attached to the boom head 17, the outriggers 5A and 5B are grounded on the ground, and the boom 8 is put in the lowest state. Also, the hook 22, the handle 70 and the relay links 36A and 36B stored in the arm 21 as described above are removed from the arm 21, and the guide member 71 stored in the handle 70 as described above is removed from the handle 70. . Then, as shown in FIG. 16 , the arm 21 is connected to the shaft 28 for the rooster sheave 27 of the boom head 17 . This allows the arm 21 to rotate around the shaft 28 . At this time, the arm 21 is connected to the boom head 17 using the foot pins 33A and 33B as described above.

Here, consider a case where the searcher hook 20 is used in a state where the angle .theta. is the first angle .theta.1. In this case, as shown in FIG. 16, one of the relay links 36A and 36B is connected to each of the boom side links 35A and 35B. Then, the handle 70 is connected to the shaft 47 via the relay members 81A and 81B as described above. Also, the guide member 71 is connected to the boom head 17 via the connecting pin 110 as described above. At this time, in the guide member 71, the guide hook 101A is held at the engagement position by the regulation pin 103A, and the guide hook 101B is held at the engagement position by the regulation pin 103B. By connecting the guide member 71 to the boom head 17, the guide member 71 is arranged on the engagement piece 68A. However, in the state of FIG. 16, the engaging piece 68A is not engaged with any of the guide hooks 101A, 101B.

When using the searcher hook 20 with the angle .theta. equal to the first angle .theta.1, the handle 70 is connected to the shaft 47 in the above-described first connection state. Then, the operator or the like applies an operation force to the column portion 72 of the first handle end portion E1 to rotate the handle 70 to the rising side about the connecting pins 85A and 85B. As a result, the portion between the protrusions 86A and 87A and the portion between the protrusions 86B and 87B of the handle 70 come into contact with the shaft 47 . Then, a force acting to raise the arm 21 with respect to the boom 8 acts on the arm 21 via the shaft 47 from the contact portion of the handle 70 with the shaft 47 . By applying an operating force to the handle 70 as described above, the operator raises the arm 21 from the state shown in FIG. The engagement piece 68A of the arm 21 is engaged with the guide hook 101A. As a result, the arm 21 is in a state in which the angle (offset angle) θ with respect to the boom 8 becomes the first angle θ1, or a state in which the angle θ is slightly raised with respect to the boom 8 from the state in which the angle θ becomes the first angle θ1. and is retained. By applying an operating force to the handle 70, an action force is applied to raise the arm 21, so that the operator can easily raise the arm 21 and easily engage the guide hook 101A with the engaging piece 68A. It is possible to combine.

Then, as shown in FIG. 18, from the state of FIG. 17, each of the attachment-side links 37A and 37B is connected to the corresponding one of the relay links 36A and 36B. 18, the guide hook 101A is rotated from the engagement position to the non-engagement position, and the guide hook 101A is held at the non-engagement position by the regulation pin 103A. Then, by applying an operating force to the wire 112 by pulling the wire 112 or the like, the guide member 71 is rotated about the connecting pin 110 in the upward direction with respect to the boom 8 . As a result, the engagement between the guide hook 101A and the engaging piece 68A is released. By applying an operating force to the wire 112, the guide member 71 rotates, so that the operator can easily release the engagement between the guide hook 101A and the engagement piece 68A. Here, even if the engagement between the guide hook 101A and the engagement piece 68A is released, each of the boom side links 35A and 35B is still connected to the corresponding one of the relay links 36A and 36B and the corresponding one of the attachment side links 37A and 37B. It is connected to the arm 21 via one side. Therefore, even if the engagement between the guide hook 101A and the engagement piece 68A is released, the arm 21 is held in a state where the angle (offset angle) θ with respect to the boom 8 is the first angle θ1.

In FIG. 17, when the arm 21 is held in a state slightly raised from the state where the angle θ becomes the first angle θ1 with respect to the boom 8, the guide hook 101A and the engaging piece 68A are held as described above. , the arm 21 is slightly lowered with respect to the boom 8. of the arm 21 with respect to the boom 8 is set to the first angle .theta.1.

Then, as shown in FIG. 19, the guide member 71 is removed from the boom head 17 and the handle 70 is removed from the shaft 47 while the angle .theta. Then, the guide member 71 is stored in the handle 70 as described above, and the handle 70 is stored in the arm 21 as described above while the guide member 71 is stored. Also, the hook 22 is attached to the shaft 47 . Then, the operator raises the boom 8 and, in a state in which the angle .theta.

In the work using the searcher hook 20, the angle θ of the arm 21 with respect to the boom 8 is set to the first angle θ1, and then the angle θ is changed to the second angle θ2 or the like. sometimes work. In this case, the handle 70 stored in the arm 21 is removed from the arm 21 and the guide member 71 stored in the handle 70 is removed from the handle 70 from the state of FIG. Then, the hook 22 is removed from the shaft 47 as shown in FIG. Also, a handle 70 is attached to the shaft 47 . When using the searcher hook 20 with the angle .theta. equal to the second angle .theta.2, the handle 70 is connected to the shaft 47 in the above-described second connection state.

Then, the guide member 71 is connected to the boom head 17 via the connecting pin 110 as described above. At this time, in the guide member 71, the guide hook 101A is held at the non-engagement position by the regulation pin 103A, and the guide hook 101B is held at the engagement position by the regulation pin 103B. Then, the guide hook 101A is moved to the engaging position, and the engaging piece 68A of the arm 21 is engaged with the guide hook 101A. As a result, the arm 21 is in a state in which the angle (offset angle) θ with respect to the boom 8 becomes the first angle θ1, or a state in which the angle θ is slightly raised with respect to the boom 8 from the state in which the angle θ becomes the first angle θ1. and is retained. When the angle .theta. when the guide hook 101A is engaged with the engaging piece 68A is slightly larger than the first angle .theta.1, the angle .theta. The arm 21 is slightly raised from the state of the angle θ1. Thereby, the guide hook 101A is engaged with the engaging piece 68A.

Then, as shown in FIG. 20, with the guide hook 101A engaged with the engagement piece 68A, the attachment side links 37A and 37B are disconnected from the corresponding one of the relay links 36A and 36B. At this time, since the guide hook 101A is engaged with the engaging piece 68A, the arm 21 is in a state where the angle (offset angle) θ with respect to the boom 8 is the first angle θ1, or the angle θ is the first angle θ1. It is held in a state slightly raised with respect to the boom 8 from the state of the angle θ1. Then, as shown in FIG. 21, from the state of FIG. 20, each of the relay links 36A and 36B is removed from the corresponding one of the boom side links 35A and 35B.

Then, the operator or the like applies an operation force to the column portion 72 of the first handle end portion E1 to rotate the handle 70 to the lying down side about the connecting pins 85A and 85B. As described above, when the searcher hook 20 is used with the angle .theta. equal to the second angle .theta.2, the handle 70 is connected to the shaft 47 in the second connection state. Therefore, by applying an operating force to the first handle end portion E1 as described above, the handle 70 has a portion of the projection 87A that faces the side where the handle 70 lies down and a portion of the projection 87B that faces the side where the handle 70 lies down. , abuts on the shaft 47 . Then, a force acting to raise the arm 21 with respect to the boom 8 acts on the arm 21 via the shaft 47 from the contact portion of the handle 70 with the shaft 47 . By applying an operating force to the handle 70 as described above, the operator raises the arm 21 from the state shown in FIG. The engagement piece 68A of the arm 21 is engaged with the guide hook 101B. As a result, the arm 21 is in a state in which the angle (offset angle) θ with respect to the boom 8 becomes the second angle θ2, or a state in which the angle θ is slightly raised with respect to the boom 8 from the state in which the angle θ becomes the second angle θ2. and is retained. By applying an operating force to the handle 70, an action force is applied to raise the arm 21, so that the operator can easily raise the arm 21 and easily engage the guide hook 101A with the engaging piece 68A. It is possible to combine.

Further, by connecting the handle 70 to the shaft 47 in the second connected state, the acting force acting on the arm 21 to raise the arm 21 is greater than in the first connected state due to the principle of leverage. Therefore, even when the arm 21 is raised until the angle θ becomes the second angle θ2 or its vicinity, the operator or the like can raise the arm 21 without increasing the operating force applied to the handle 70 . be possible.

Then, as shown in FIG. 22, from the state of FIG. 21, each of the attachment side links 37A and 37B is connected to the corresponding one of the boom side links 35A and 35B. Then, in a state in which each of the attachment-side links 37A, 37B is connected to the corresponding one of the boom-side links 35A, 35B, the guide hook 101B is rotated from the engagement position to the non-engagement position, and guided by the regulating pin 103B. Hold hook 101B in the disengaged position. Then, by applying an operating force to the wire 112 by pulling the wire 112 or the like, the guide member 71 is rotated about the connecting pin 110 in the upward direction with respect to the boom 8 . As a result, the engagement between the guide hook 101B and the engaging piece 68A is released. By applying an operating force to the wire 112, the guide member 71 rotates, so that the operator or the like can easily release the engagement between the guide hook 101B and the engagement piece 68A. Here, even if the engagement between the guide hook 101B and the engagement piece 68A is released, each of the boom side links 35A and 35B is connected to the arm 21 via the corresponding one of the attachment side links 37A and 37B. be. Therefore, even if the engagement between the guide hook 101B and the engaging piece 68A is released, the arm 21 is held in a state where the angle (offset angle) θ with respect to the boom 8 is the second angle θ2.

In FIG. 22, when the arm 21 is held in a state slightly raised with respect to the boom 8 from the state where the angle θ becomes the second angle θ2, the guide hook 101A and the engaging piece 68A are held as described above. , the arm 21 is slightly lowered with respect to the boom 8. of the arm 21 with respect to the boom 8 is set to the second angle .theta.2.

Then, as shown in FIG. 23, the guide member 71 is removed from the boom head 17 and the handle 70 is removed from the shaft 47 while the angle .theta. Then, the guide member 71 is stored in the handle 70 as described above, and the handle 70 is stored in the arm 21 as described above while the guide member 71 is stored. Also, the hook 22 is attached to the shaft 47 . Also, the relay links 36A and 36B are stored in the arm 21 as described above. Then, the operator raises the boom 8, and in a state where the angle .theta. of the arm 21 with respect to the boom 8 becomes the second angle .theta.

As described above, in this embodiment, the shaft 47 of the arm 21 is connected to the second handle end E2 of the handle 70 . By applying an operating force to the first handle end portion E1 of the handle 70, an action force for raising the arm 21 acts on the arm 21, so that the operator can easily raise the arm 21. Become. As a result, an operator or the like can easily connect the searcher hook 20 as an attachment to the front end of the boom 8 . Moreover, the work of changing the angle θ of the arm 21 with respect to the boom 8 can be easily performed.

Also, the handle 70 can be connected to the shaft 47 in a first connected state and a second connected state. In particular, since the handle 70 is connected to the shaft 47 in the second connection state, the force acting on the arm 21 to raise the arm 21 when an operation force is applied to the handle 70 is increased by the principle of leverage. . Therefore, even when the arm 21 is raised to a state where the angle θ is large, such as when the arm 21 is raised until the angle θ becomes the second angle θ2 or its vicinity, the operator or the like does not apply the operating force to the handle 70. It is possible to raise the arm 21 without increasing the As a result, workability of connecting the searcher hook 20 to the front end of the boom 8 and changing the angle θ of the arm 21 with respect to the boom 8 is improved.

In this embodiment, the guide hook 101A of the guide member 71 is engaged with the engagement piece 68A of the arm 21, so that the angle (offset angle) θ of the arm 21 with respect to the boom 8 becomes the first angle θ1. or in a state slightly raised with respect to the boom 8 from the state in which the angle θ becomes the first angle θ1. Thereby, each of the boom side links 35A, 35B can be easily connected to the arm 21 via the corresponding one of the relay links 36A, 36B and the corresponding one of the attachment side links 37A, 37B. As a result, the workability of connecting the arm 21 to the front end of the boom 8 with the angle .theta. equal to the first angle .theta.1 is improved.

Further, in this embodiment, the guide hook 101B of the guide member 71 is engaged with the engagement piece 68A of the arm 21, so that the angle (offset angle) θ of the arm 21 with respect to the boom 8 becomes the second angle θ2. or in a state slightly raised with respect to the boom 8 from the state in which the angle θ becomes the second angle θ2. Thereby, each of the boom side links 35A and 35B can be easily connected to the arm 21 via the corresponding one of the attachment side links 37A and 37B. As a result, the workability of connecting the arm 21 to the front end of the boom 8 while the angle .theta. is the second angle .theta.2 is improved.

Further, in the present embodiment, when an operator or the like applies an operating force to the wire 112 , the guide member 71 is moved such that the guide member 71 rotates around the connecting pin 110 . Therefore, an operator or the like can apply an operating force to the handle 70 to raise the arm 21 and at the same time apply an operating force to the wire 112 to rotate the guide member 71 . As a result, workability of connecting the searcher hook 20 to the front end of the boom 8 and changing the angle θ of the arm 21 with respect to the boom 8 is improved.

Further, in this embodiment, when the handle 70 and the guide member 71 are not used, the guide member 71 can be stored in the handle 70 as described above. The handle 70 can be stored in the arm 21 as described above with the guide member 71 stored. Therefore, the loss of the handle 70, the guide member 71, and parts related to these when the handle 70 and the guide member 71 are not used is effectively prevented.

(Modification)
It should be noted that in some variations the jib 10 may not be provided. In this case, the tension rods 11A, 11B are also not provided. Also in this modified example, the searcher hook 20 as an attachment is connected to the boom head 17 (the front end of the boom 8) in the same manner as in the above-described embodiment. In addition, in the above-described embodiment and the like, the second handle end E2 of the handle 70 is connected to the shaft 47 via the relay members 81A and 81B. Part E2 may be directly connectable to shaft 47 . In this case, the handle 70 is rotatable around the shaft 47 . Also, while the handle 70 is detachable from the shaft 47 in the embodiments such as those described above, in some variations the handle 70 may not be detachable from the shaft 47 . That is, it is sufficient that the second handle end E2 of the handle 70 can be connected to the shaft 47 .

In the above-described embodiments, the angle θ is the first angle θ1 or slightly larger than the first angle θ1, and the angle θ is the second angle θ2 or slightly larger than the second angle θ2. The angle θ of the arm 21 with respect to the boom 8 can be maintained in two states, namely, a state in which the angle is large, but the angle θ is not limited to this. In one variant, the angle θ of the arm 21 relative to the boom 8 can be maintained only in one state where the angle θ is a predetermined angle. In this case, a guide hook similar to the guide hooks 101A and 101B is formed at one location on the guide member 71. As shown in FIG. Also, in some other variations, the angle θ of the arm 21 with respect to the boom 8 can be maintained in three or more states in which the angles θ are different with respect to each other. In this case, the guide member 71 is formed with three or more guide hooks similar to the guide hooks 101A and 101B.

Also, the relay links 36A and 36B may not be provided. In a modification, the searcher hook 20 can be used only when the angle .theta.

In another modification, the searcher hook 20 can be used in a plurality of states with different angles .theta. In this case, each of the attachment-side links 37A and 37B can expand and contract along the extension direction (axial direction). The dimensions in the extension direction (axial direction) of the attachment-side links 37A and 37B can be maintained, for example, in a state of being the first dimension and the second dimension smaller than the first dimension. When the searcher hook 20 is used in a state where the angle θ becomes the first angle θ1, the attachment side links 37A and 37B maintain the first dimension in the extending direction, and the attachment side Each of the links 37A, 37B is connected to a corresponding one of the boom side links 35A, 35B. On the other hand, when the searcher hook 20 is used with the angle θ equal to the second angle θ2, while the dimensions of the attachment-side links 37A and 37B in the extension direction are maintained at the second dimensions, Each of the attachment side links 37A, 37B is connected to the corresponding one of the boom side links 35A, 35B.

Also, the attachment connected to the boom head 17 is not limited to the searcher hook 20 . In one variant, instead of the searcher hook 20, a jib with a short longitudinal dimension is connected to the boom head 17 as an attachment. In this case, with the short jib attached to the boom head 17, for example, an auxiliary hook (not shown) is suspended from the front end of the short jib via a rope (auxiliary winding rope). Also in this modified example, the short jib can be connected to the boom head 17 by using the handle 70 and the guide member 71 like the searcher hook 20 .

It should be noted that the present invention is not limited to the above-described embodiments, and can be variously modified in the implementation stage without departing from the gist of the invention. Moreover, each embodiment may be implemented in combination as much as possible, and in that case, the combined effect can be obtained. Furthermore, the above-described embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements.

DESCRIPTION OF SYMBOLS 1... Crane 2... Running vehicle body 8... Boom 17... Boom head 20... Searcher hook 21... Arm 22... Hook 35A, 35B... Boom side link 36A, 36B... Relay link 37A, 37B... Attachment side link 47 Shaft 70 Handle 71 Guide member 81A, 81B Relay member 86A, 86B, 87A, 87B Projection E1 First handle end E2 Second handle end Department.

Claims (4)

An attachment that can be attached to the front end of a boom in a construction machine equipped with a boom,
An arm extending along the longitudinal direction from the rear side to the front side, the arm being connectable at the rear end to the front end of the boom, the arm being attached to the boom centering on the position of connection to the front end of the boom. an arm that rises or lays down relative to the boom by pivoting relative to it;
a shaft provided at the front end of the arm and extending along the width direction of the arm intersecting both the longitudinal direction of the arm and the undulating direction of the arm;
A handle having a first handle end and a second handle end and extending along a handle longitudinal direction from the first handle end to the second handle end, With two handle ends connectable to the shaft and the second handle end connected to the shaft, application of an operating force to the first handle end causes the arm to move. a handle capable of exerting an acting force on the boom from the second handle end to the arm via the shaft;
a relay member attached to the shaft so as to be rotatable about the shaft;
and
The handle is connected to the shaft via the relay member, and is rotatable about the connection position to the relay member. By rotating about the connection position to the relay member, , standing up or lying down with respect to said arm;
attachment. the handle includes a first projection and a second projection projecting rearward in the longitudinal direction of the handle at the end of the second handle;
the handle is connected to the shaft via the relay member in a state in which the first projection is located on the side on which the handle is raised with respect to the second projection;
The handle has a first connection state in which a portion between the first projection and the second projection can abut against the shaft, and a portion of the second projection facing the side where the handle lies down. is connectable to the shaft in a second connected state in which the is abuttable against the shaft;
The attachment of Claim 1 . 3. An attachment as claimed in claim 1 or 2 , wherein the handle is retractable on the arm. an attachment according to any one of claims 1 to 3 ;
a boom in which the arm of the attachment is rotatably connected to the front end;
construction equipment.