WO2018211623A1 - Hook-equipped work tool link and construction machine - Google Patents

Abstract

A hook (2) has a hook part (2a) and is supported by a link member (1) so as to be movable between a fixation position and a fixation release position. A pin (7) is shaped so as to extend in a longitudinal direction (LD), and is capable of moving between a lock position, at which the pin is inserted in the hook part (2a) of the hook (2) situated at the fixation position by the pin being moved in the longitudinal direction (LD) with respect to the link member (1), and a lock release position, at which the pin is out of the hook part (2a). An elastic member (6) biases the pin (7) so as to be in the lock position. An operating plate (5) is mounted to the pin (7) and, by coming into contact with the link member (1), restrains prevents the pin (7) from moving from the lock position to the lock release position.

Description

Work implement link with hook and construction machine

The present invention relates to a work tool link with a hook and a construction machine.

Conventionally, there is a model in which a hydraulic excavator work machine is used as a crane by providing a hook at the tip of the arm of the hydraulic excavator. It is preferable to store the hook in the arm when the crane is not used so that the hook does not get in the way during excavation work.

The structure for fixing the hook to the arm is disclosed in, for example, Japanese Utility Model Publication No. 62-200688 (Patent Document 1), Japanese Patent Application Laid-Open No. 2014-156339 (Patent Document 2), and the like.

In the above Patent Documents 1 and 2, the hook is fixed by pressing the side portion of the hook by the biasing means.

Japanese Utility Model Publication No. 62-200688 JP 2014-156339 A

When the hook is fixed using the biasing means as in Patent Documents 1 and 2, the pressing force of the biasing means against the hook may be weakened due to vibration or the like. For this reason, in the fixing of the hook using the urging means, the fixing of the hook is not reliable.

An object of the present invention is to provide a work tool link with a hook and a construction machine that can securely fix the hook.

The construction machine according to the present disclosure includes an arm, an attachment, and a work tool link with a hook. The work tool link with the hook is included in a link mechanism that connects the arm and the attachment. The work tool link with a hook has a link member, a hook, a pin, an elastic member, and an operation plate. The hook has a flange and is supported by the link member so as to be movable between a fixed position and a fixed release position. The pin is movable between a lock position inserted into the hook collar at the fixed position and a lock release position pulled out from the collar. The elastic member urges the pin to be in the locked position. The operation plate is attached to the pin and restricts movement of the pin from the lock position to the lock release position by contact with the link member in a state where the pin is biased by the elastic member and is in the lock position.

The work tool link with a hook in the present disclosure includes a link member, a hook, a pin, an elastic member, and an operation plate. The hook has a flange and is supported by the link member so as to be movable between a fixed position and a fixed release position. The pin is movable between a lock position inserted into the hook collar at the fixed position and a lock release position pulled out from the collar. The elastic member urges the pin to be in the locked position. The operation plate is attached to the pin and restricts movement of the pin from the lock position to the lock release position by contact with the link member in a state where the pin is biased by the elastic member and is in the lock position.

According to the present disclosure, it is possible to realize a work tool link with a hook and a construction machine that can securely fix the hook as described above.

It is a perspective view which shows the structure of the hydraulic shovel in one embodiment. It is a disassembled perspective view which shows the structure of the working tool link with a hook used for the hydraulic shovel of FIG. FIG. 2 is an assembled perspective view showing a configuration of a working tool link with a hook used in the hydraulic excavator of FIG. 1 and showing a state in which the hook is fixed. FIG. 2 is an assembly plan view showing a configuration of a work tool link with a hook used in the hydraulic excavator of FIG. 1 and showing a state in which the hook is fixed. It is a fragmentary perspective view which shows the 1st process of the assembly method of the working tool link with a hook shown in FIG. It is a fragmentary perspective view which shows the 2nd process of the assembly method of the working tool link with a hook shown in FIG. It is a fragmentary perspective view which shows the 3rd process of the assembly method of the working tool link with a hook shown in FIG. It is a fragmentary perspective view which shows the 4th process of the assembly method of the working tool link with a hook shown in FIG. It is a fragmentary perspective view which shows the 1st process of the method of the fixation cancellation | release of a hook in the working tool link with a hook shown in FIG. It is a fragmentary perspective view which shows the 2nd process of the fixing release method of the hook in the working tool link with a hook shown in FIG. It is a fragmentary perspective view which shows the 3rd process of the fixing release method of the hook in the working tool link with a hook shown in FIG.

First, the configuration of a construction machine according to an embodiment of the present disclosure will be described. Hereinafter, a hydraulic excavator will be described with reference to FIG. 1 as an example of a construction machine to which the idea of the present disclosure can be applied.

FIG. 1 is a perspective view showing a configuration of a hydraulic excavator according to an embodiment. The present disclosure can be applied to construction machines such as bulldozers and wheel loaders in addition to hydraulic excavators. In the following description, “up”, “down”, “front”, “rear”, “left”, and “right” are directions based on the operator seated on the driver's seat 22b in the cab 22a. .

As shown in FIG. 1, the excavator 20 according to the present embodiment mainly includes a traveling body 21, a revolving body 22, and a work implement 23. The traveling body 21 and the revolving body 22 constitute a vehicle main body of the excavator 20.

The traveling body 21 has a pair of left and right crawler belts 21a. The hydraulic excavator 20 is configured to be capable of self-running when the pair of left and right crawler belts 21a are rotationally driven.

The turning body 22 is installed so as to be turnable with respect to the traveling body 21. The swivel body 22 mainly has a cab 22a and a counterweight 22c. The driver's cab 22a is disposed, for example, on the front left side (vehicle front side) of the revolving structure 22. A driver's seat 22b for an operator to sit on is disposed inside the operator's cab 22a.

The counterweight 22c is disposed on the rear side (rear side of the vehicle) of the revolving structure 22. The engine hood is disposed so as to cover at least the upper part of the engine room. An engine unit (engine, exhaust treatment unit, etc.) is housed in the engine room. The counterweight 22c is disposed behind the engine room in order to balance the vehicle body during mining.

The work machine 23 is for performing work such as earth excavation. The work machine 23 is attached to the front side of the revolving structure 22. The work machine 23 includes, for example, a boom 23a, an arm 23b, a bucket 23c, hydraulic cylinders 23d, 23e, and 23f. The work implement 23 can be driven by each of the boom 23a, the arm 23b, and the bucket 23c being driven by the hydraulic cylinders 23d, 23e, and 23f.

The base end portion of the boom 23a is connected to the revolving body 22 via a boom pin (not shown). The boom 23a is rotatably provided around the boom pin. The base end portion of the arm 23b is connected to the tip end portion of the boom 23a via an arm pin 23g. The arm 23b is rotatably provided around the arm pin 23g. Bucket 23c is connected to the tip of arm 23b via bucket pin 23h. The bucket 23c is provided to be rotatable around a bucket pin 23h.

The mechanism that connects the arm 23b and the bucket 23c constitutes a link mechanism. The link mechanism mainly includes an arm 23b, a bucket 23c, a hook-equipped work tool link 10 (link member 1), and a bucket link 24.

As described above, the arm 23b and the bucket 23c are rotatably connected to each other by the bucket pin 23h. The bucket 23 c and the link member 1 are connected by a bucket pin 27. The bucket 23c and the link member 1 are provided to be rotatable with respect to each other about the bucket pin 27.

The link member 1 and the bucket link 24 are connected by a link pin 26. The link member 1 and the bucket link 24 are provided to be rotatable with respect to each other about the link pin 26. The bucket link 24 and the arm 23b are connected by an arm pin 25. The bucket link 24 and the arm 23b are provided so as to be rotatable around an arm pin 25.

The hook 2 is attached to the link member 1. A work tool link 10 with a hook is constituted by the link member 1, the hook 2, and the like. The hook 2 is provided to be rotatable with respect to the link member 1 and the bucket 23 c around the bucket pin 27. A heavy object LO can be lifted on the hook 2 by hooking a wire rope or the like. Thereby, the excavator 20 can perform a work as a so-called crane.

Next, the configuration of each part of the hook-equipped work tool link 10 used in the hydraulic excavator 20 will be described with reference to FIG.

FIG. 2 is an exploded perspective view showing a configuration of a work tool link 10 with a hook used in the excavator of FIG.

As shown in FIG. 2, the work tool link 10 with a hook according to the present embodiment includes a link member 1, a hook 2, a first pin portion 3, a second pin portion 4, an operation plate 5, an elastic member. It mainly has a member 6.

The link member 1 mainly includes a first plate 1a, a second plate 1b, a connecting portion 1e, bucket side bosses 1f and 1g, cylinder side bosses 1h and 1i, and pin support portions 1j and 1k. ing. The first plate 1a and the second plate 1b are disposed with a space therebetween. The first plate 1a and the second plate 1b extend, for example, in parallel to each other. Moreover, the space | interval of the 1st plate 1a and the 2nd plate 1b may become large as it goes to the bucket side bosses 1f and 1g from the cylinder side bosses 1h and 1i.

The first plate 1a and the second plate 1b are connected to each other by a connecting portion 1e. Each of the first plate 1a and the second plate 1b has a flat plate shape. A through hole 1c is provided so as to penetrate the first plate 1a.

A bucket-side boss 1f is attached to one end of the first plate 1a (connecting portion with the bucket 23c). A through hole 1fa is provided in the bucket-side boss 1f. A bucket-side boss 1g is attached to one end of the second plate 1b (connection to the bucket 23c). A through hole 1ga is provided in the bucket-side boss 1g. The through hole 1fa of the bucket side boss 1f and the through hole 1ga of the bucket side boss 1g are disposed so as to be concentric with each other. A bucket pin 27 (FIG. 1) can be inserted into the through hole 1fa and the through hole 1ga to connect the bucket 23c.

A cylinder-side boss 1h is attached to the other end of the first plate 1a (connection to the bucket cylinder 23f). A through hole 1ha is provided in the cylinder-side boss 1h. A cylinder-side boss 1i is attached to the other end of the second plate 1b (connection to the bucket cylinder 23f). The cylinder side boss 1i is provided with a through hole 1ia. The through hole 1ha of the cylinder side boss 1h and the through hole 1ia of the cylinder side boss 1i are disposed so as to be concentric with each other. A link pin 26 (FIG. 1) can be inserted into the through hole 1ha and the through hole 1ia to connect the bucket cylinder 23f.

Each of the pin support portions 1j and 1k is connected to the connecting portion 1e. Each of the pin support portions 1j and 1k is disposed between the first plate 1a and the second plate 1b. The pin support portion 1j is disposed between the first plate 1a and the pin support portion 1k. The pin support portion 1k is disposed between the second plate 1b and the pin support portion 1j.

The pin support portion 1j is provided with a through hole 1ja. The pin support 1k is provided with a through hole 1ka. The through hole 1c of the first plate 1a, the through hole 1ja of the pin support portion 1j, and the through hole 1ka of the pin support portion 1k are arranged concentrically with each other.

The hook 2 has a flange portion 2a, a joint portion 2b, and a hook support portion 2c. The hook support portion 2c has a through hole 2ca. In this through hole 2ca, the link bush 27a is inserted in a state of being concentric with the through hole 1fa of the bucket side boss 1f and the through hole 1ga of the bucket side boss 1g. Thus, the hook support portion 2c is attached to the link member 1. The hook support portion 2c can rotate around the axis of the link bush 27a. Thereby, the hook 2 can rotate with respect to the link member 1.

The joint portion 2b is attached to the hook support portion 2c by a support shaft 2d. The joint portion 2b is rotatable with respect to the hook support portion 2c around the support shaft 2d. A flange 2a is attached to the tip of the joint 2b.

鉤 part 2a consists of an eye hook with a latch, for example. The collar portion 2a includes an eye hook member 2aa and a latch member 2ab. The eyehook member 2aa has a shape whose tip is curved like a bowl. The latch member 2ab is attached to the eye hook member 2aa. The latch member 2ab can open and close the open portion of the eyehook member 2aa.

Each of the first pin portion 3 and the second pin portion 4 has a shape extending in the longitudinal direction LD. The 1st pin 3 has the main-body part 3a and the external thread part 3b which protruded along the said longitudinal direction LD from the main-body part 3a. The 2nd pin part 4 has the main-body part 4a and the internal thread part 4b extended along the said longitudinal direction LD in the main-body part 4a.

The first pin portion 3 and the second pin portion 4 can be connected by screwing the male screw portion 3b of the first pin portion 3 into the female screw portion 4b of the second pin portion 4. A pin 7 extending along one longitudinal direction LD is formed from the first pin portion 3 and the second pin portion 4 connected to each other.

The operation plate 5 has an annular portion 5a, a rotation preventing portion 5c, and a grip portion 5d. The annular portion 5a has an annular shape and has a through hole 5b in the center. The opening diameter of the through hole 5 b is set smaller than both the outer diameter of the first pin portion 3 and the outer diameter of the second pin portion 4. The opening diameter of the through hole 5 b is set larger than the outer diameter of the male screw portion 3 b of the first pin portion 3.

The anti-rotation part 5c has an extending part 5cb and a bent part 5ca. The extending part 5cb extends from the annular part 5a to the outer peripheral side of the annular part 5a. The bent portion 5ca is bent from the tip of the extending portion 5cb to the first pin portion 3 side.

The grip portion 5d has a root portion 5db, an inclined portion 5dc, and a bent portion 5da. The root portion 5db extends from the annular portion 5a to the outer peripheral side of the annular portion 5a. The inclined portion 5dc is bent with respect to the root portion 5db, and is inclined from the tip of the root portion 5db to the second pin portion 4 side. The bent portion 5da is bent with respect to the inclined portion 5dc and extends substantially parallel to the second pin portion 4 from the tip of the inclined portion 5dc. The bent portion 5da extends along the longitudinal direction.

The outer diameter of the annular portion 5a of the operation plate 5 is larger than the opening diameter of the through hole 1ja of the pin support portion 1j. The outer diameter of the annular portion 5 a is larger than the outer diameter of the first pin portion 3 and the outer diameter of the second pin portion 4. The outer diameter of the first pin portion 3 is larger than the outer diameter of the second pin portion 4.

The male screw portion 3b of the first pin portion 3 is screwed into the female screw portion 4b of the second pin portion 4 with the through hole 5b of the operation plate 5 being inserted. Therefore, the operation plate 5 is sandwiched between the first pin portion 3 and the second pin portion 4 in a state where the first pin portion 3 and the second pin portion 4 are connected. Thereby, the operation plate 5 is fixed to the pin 7 including the first pin portion 3 and the second pin portion 4.

The elastic member 6 is, for example, a coil spring, but is not limited thereto. The elastic member 6 is extrapolated to the second pin portion 4. The outer diameter of the annular portion 5 a is larger than the outer diameter of the elastic member 6. Thereby, the edge part of the elastic member 6 can contact | abut to the annular part 5a.

Next, the structure in which the hooked work tool link 10 is assembled will be described with reference to FIGS.

FIG. 3 is an assembly perspective view showing a configuration of a work tool link with a hook used in the hydraulic excavator of FIG. 1 and showing a state in which the hook is fixed (state in a fixed position). FIG. 4 is an assembly plan view showing a configuration of a work tool link with a hook used in the hydraulic excavator of FIG. 1 and showing a state in which the hook is fixed.

2 and 3, the through hole 2ca of the hook 2 is disposed concentrically with the through hole 1fa of the bucket side boss 1f and the through hole 1ga of the bucket side boss 1g.

In this state, the link bush 27a is inserted into the through hole 2ca of the hook 2, the through hole 1fa of the bucket side boss 1f, and the through hole 1ga of the bucket side boss 1g. As a result, the hook support portion 2 c is attached to the link member 1. A bucket pin 27 (FIG. 1) is inserted into the link bush 27a. The hook support portion 2 c is rotatable with respect to the link member 1 around the bucket pin 27.

The hook 2 is supported by the link member 1 so as to be movable between a fixed position and a fixed release position around the bucket pin 27. The fixing position of the hook 2 is the position of the hook indicated by a solid line in FIG. In a state where the hook 2 is in the fixed position, the flange portion 2a of the hook 2 is located between the pin support portion 1j and the pin support portion 1k. The fixing release position of the hook 2 is a position rotated around the bucket pin 27 from the fixing position of the hook 2, for example, a position indicated by a broken line in FIG.

The first pin portion 3 is inserted into the through hole 1ja (FIG. 2) of the pin support portion 1j. The second pin portion 4 is inserted into the through hole 1c of the first plate 1a. The first pin portion 3 and the second pin portion 4 are connected to each other with the operation plate 5 interposed therebetween. The connection between the first pin portion 3 and the second pin portion 4 is performed by screwing the male screw portion 3 b of the first pin portion 3 into the female screw portion 4 b of the second pin portion 4.

The end portion of the first pin portion 3 is in contact with one surface of the annular portion 5a of the operation plate 5. The end portion of the second pin portion 4 is in contact with the other surface of the annular portion 5 a of the operation plate 5. An elastic member 6 is extrapolated to the second pin portion 4.

Each of the operation plate 5 and the elastic member 6 is disposed between the pin support portion 1j and the first plate 1a. The operation plate 5 is disposed closer to the pin support portion 1j than the elastic member 6.

One end of the elastic member 6 is in contact with the annular portion 5a of the operation plate 5, and the other end of the elastic member 6 is in contact with the first plate 1a. The operation plate 5 is urged toward the pin support portion 1 j by the elastic member 6. Thereby, the elastic member 6 is urging | biasing the pin 7 so that it may become a lock position mentioned later. In this state, one surface of the annular portion 5a in the operation plate 5 is in contact with the pin support portion 1j.

The pin 7 is movable with respect to the link member 1 in the longitudinal direction LD of the pin 7. Further, the pin 7 is rotatable with respect to the link member 1 around the longitudinal direction LD. By sliding and rotating the pin 7 with respect to the link member 1, the pin 7 can move between the lock position and the unlock position.

Here, the locked position of the pin 7 is a position where the pin 7 is inserted into the buttocks of the hook 2 in the fixed position. Further, the unlocking position is a position where the pin 7 is pulled out from the hook portion of the hook 2 in the fixed position.

The operation plate 5 regulates the movement of the pin 7 from the lock position to the lock release position by contact with the link member 1 in a state where the pin 7 is biased by the elastic member 6 and is in the lock position. Hereinafter, the configuration of the operation plate 5 and the link member 1 for realizing the restriction will be described with reference to FIGS. 3 and 4.

As shown in FIG. 3, the bent portion 5ca of the operation plate 5 is located on the outer peripheral side in the radial direction of the through hole 1ja relative to the outer surface 1jb of the pin support portion 1j. As a result, the bent portion 5ca faces the outer surface 1jb of the pin support portion 1j. The outer surface 1jb of the pin support portion 1j intersects both the surface (first surface) 1jc facing the first plate 1a and the surface (second surface) 1jd facing the second plate 1b of the pin support portion 1j. It is a surface to do. The outer surface 1jb is sandwiched between the two surfaces 1jc and 1jd.

As the outer surface 1jb approaches the connecting portion 1e from a predetermined height position with respect to the connecting portion 1e (the lower the height from the connecting portion 1e), the radial direction from the center of the through hole 1ja to the outer surface 1jb The dimension D2 is increased. The dimension D2 of the outer surface 1jb at a position higher than the predetermined height position with respect to the connecting portion 1e is a radial direction from the center of the through hole 5b of the operation plate 5 to the bent portion 5ca at the distal end of the detent portion 5c. It is smaller than the dimension D1. On the other hand, the dimension D2 on the outer surface 1jb at a position lower than the predetermined height position with respect to the connecting portion 1e is larger than the dimension D1.

Therefore, in a state where the bent portion 5ca faces the outer surface 1jb of the pin support portion 1j, the outer surface of the pin support portion 1j in the rotation direction (the connecting portion 1e side) of the bent portion 5ca with the longitudinal direction LD of the pin 7 as the center. 1jb is located.

Thus, when the operation plate 5 in the above state is rotated in a direction in which the bent portion 5ca approaches the connecting portion 1e, the bent portion 5ca comes into contact with the outer surface 1jb of the pin support portion 1j. Thus, the rotation of the operation plate 5 is regulated by the pin support portion 1j.

In the state where the bent portion 5ca faces the outer surface 1jb, the grip portion 5d of the operation plate 5 is located between the first plate 1a and the pin support portion 1j. The dimension LF along the longitudinal direction LD of the grip portion 5d is smaller than the dimension LE along the longitudinal direction LD of the gap (first gap) between the first plate 1a and the pin support portion 1j. Therefore, the grip portion 5d can be disposed between the pin support portion 1j and the first plate 1a.

In the state where the grip portion 5d is positioned between the pin support portion 1j and the first plate 1a, the grip portion 5d extends from the pin support portion 1j side to the first plate 1a side. There is a gap (second gap) between the tip of the grip portion 5d and the first plate 1a.

As shown in FIG. 4, the dimension LC along the longitudinal direction of the portion of the pin 7 inserted into the flange portion 2a is between the tip of the grip portion 5d (tip 5daa of the bent portion 5da) and the first plate 1a. It is larger than the dimension LA along the longitudinal direction LD of the gap (second gap). For this reason, even when the operation plate 5 is moved in the longitudinal direction LD from the state where the bent portion 5ca faces the outer surface 1jb of the pin support portion 1j until it comes into contact with the first plate 1a, the pin 7 is completely removed from the flange portion 2a. Never get out.

Thus, the movement amount of the operation plate 5 in the longitudinal direction LD is limited by the first plate 1a. Accordingly, the pin 7 cannot be completely removed from the flange portion 2a simply by sliding the operation plate 5 in the longitudinal direction LD. Therefore, the movement of the pin 7 from the lock position to the lock release position is restricted between the operation plate 5 and the link member 1.

Further, the movement restriction of the pin 7 from the lock position to the lock release position is released by rotating the operation plate 5 after being slid in the longitudinal direction LD. Hereinafter, a configuration capable of releasing the restriction will be described with reference to FIGS. 4 and 2.

As shown in FIG. 4, the dimension LA along the longitudinal direction LD of the gap between the tip 5daa of the gripping portion 5d and the first plate 1a is the longitudinal direction LD of the portion where the bent portion 5ca faces the outer surface 1jb. It is larger than the dimension LB along. For this reason, by sliding the operation plate 5 along the longitudinal direction LD toward the first plate 1a, the bent portion 5ca can be slid to a position not facing the outer surface 1jb.

In a state where the bent portion 5ca does not face the outer surface 1jb, the restriction on rotation about the longitudinal direction LD of the operation plate 5 is released. For this reason, it becomes possible to rotate the operation plate 5 in the direction in which the bent portion 5ca approaches the connecting portion 1e.

Here, as shown in FIG. 2, the dimension D3 in the radial direction from the center of the through hole 5b of the operation plate 5 to the bent portion 5da of the grip portion 5d is from the center of the through hole 1c in the first plate 1a to the first plate. It is larger than the shortest dimension D4 in the radial direction to the upper end 1aa of 1a. For this reason, when the grip portion 5d is positioned on the side opposite to the connecting portion 1e due to the rotation of the operation plate 5, the bent portion 5da of the grip portion 5d is above the upper end 1aa of the first plate 1a (the connecting portion 1e). In the height direction on the basis of. Specifically, the bent portion 5da is located farther from the connecting portion 1e than the upper end 1aa.

Thus, the first plate 1a does not face the longitudinal direction LD of the bent portion 5da. Therefore, in the rotation state of the operation plate 5, even if the operation plate 5 is slid toward the first plate 1a along the longitudinal direction LD, the tip 5daa of the bent portion 5da does not contact the first plate 1a. .

Here, the dimension LE along the longitudinal direction LD of the gap (first gap) between the first plate 1a and the pin support portion 1j is the dimension LC along the longitudinal direction of the portion of the pin 7 inserted into the flange 2a. Bigger than. For this reason, in the rotation state of the operation plate 5, the operation plate 5 can be slid along the longitudinal direction LD until the pin 7 is completely removed from the flange portion 2 a.

By rotating the operating plate 5 after sliding it in the longitudinal direction LD as described above, the pin 7 can be completely removed from the flange 2a, and the pin 7 can be moved from the locked position to the unlocked position. .

Next, a method for assembling the work tool link with a hook according to the present embodiment will be described with reference to FIGS.

5 to 8 are partial perspective views showing the assembly method of the work tool link with hook shown in FIG. 2 in the order of steps. As shown in FIG. 5, the elastic member 6 and the operation plate 5 are disposed between the first plate 1a of the link member 1 and the pin support portion 1j. At this time, the through hole 5b and the elastic member 6 of the operation plate 5 are concentric with both the through hole 1ja of the pin support portion 1j and the through hole 1c of the first plate 1a. In this state, the operation plate 5 is pressed against the pin support portion 1 j by the elastic member 6. Both the operation plate 5 and the elastic member 6 can maintain this state by the biasing force of the elastic member 6.

As shown in FIG. 6, the first pin portion 3 is inserted into the through hole 1ka of the pin support portion 1k from the second plate 1b side.

7, the first pin portion 3 is moved from the through hole 1ka of the pin support portion 1k to the pin support portion 1j side and is inserted into the through hole 1ja of the pin support portion 1j. At this time, the first pin portion 3 is inserted into the through hole 1ja up to a position where it abuts on one surface of the annular portion 5a of the operation plate 5. In this state, the male screw portion 3b of the first pin portion 3 passes through the through hole 5b of the annular portion 5a.

On the other hand, the second pin portion 4 is inserted into the through hole 1c of the first plate 1a from the side opposite to the second plate 1b side with respect to the first plate 1a. The second pin portion 4 passes through the through hole 1 c and is inserted into the elastic member 6.

As shown in FIG. 8, the male screw portion 3 b of the first pin portion 3 is screwed into the female screw portion 4 b of the second pin portion 4. This screwing is performed using the tools 31 and 32, for example. Specifically, the first pin portion 3 is held by the tool 31, the second pin portion 4 is held by the tool 32, and the second pin is relative to the first pin portion 3 using the tools 31 and 32. Screwing is performed by rotating the part 4.

By screwing the male screw portion 3b of the first pin portion 3 into the female screw portion 4b of the second pin portion 4, the first pin portion 3 and the second pin portion 4 are connected with the operation plate 5 interposed therebetween. In a state where the connection between the first pin portion 3 and the second pin portion 4 is completed, the first pin portion 3 abuts on one surface of the annular portion 5a of the operation plate 5, and the second pin portion 4 is an annular portion. It contacts the other surface of 5a. The operation plate 5 is held by being sandwiched between the first pin portion 3 and the second pin portion 4. The second pin portion 4 is inserted into the elastic member 6. As a result, the elastic member 6 biases the operation plate 5 toward the pin support portion 1j.

As described above, the work implement link 10 with the hook in the present embodiment is assembled.

Next, a method for releasing the hook 2 in the present embodiment will be described with reference to FIGS. 3 and 9 to 11.

FIG. 9 to FIG. 11 are partial perspective views showing a method of releasing the fixing in the work tool link with a hook shown in FIG. 2 in the order of steps. As shown in FIG. 3, when the hook 2 is fixed to the link member 1, the first pin portion 3 of the pin 7 is inserted into the flange portion 2 a of the hook 2. In this state, the operation plate 5 is pressed against the pin support portion 1j by the elastic member 6. Further, the bent portion 5ca of the operation plate 5 faces the outer surface 1jb of the pin support portion 1j. Accordingly, when the operation plate 5 in the fixed state is to be rotated in a direction in which the bent portion 5ca approaches the connecting portion 1e, the bent portion 5ca comes into contact with the outer surface 1jb. Thus, the rotation of the operation plate 5 is regulated by the pin support portion 1j.

From this fixed state, the operation plate 5 is slid to the first pin portion 3 side along the longitudinal direction LD. As a result, the bent portion 5ca of the operation plate 5 slides to a position where it does not face the outer surface 1jb of the pin support portion 1j.

As shown in FIG. 9, since the bent portion 5ca does not face the outer surface 1jb (FIG. 3), the restriction on the rotation of the operation plate 5 around the longitudinal direction LD is released. Thereafter, the operation plate 5 is rotated in a direction in which the bent portion 5ca of the operation plate 5 approaches the connecting portion 1e.

As shown in FIG. 10, the operation plate 5 is rotated until the grip portion 5d extends to the side opposite to the connecting portion 1e. In this state, the bent portion 5da of the grip portion 5d is located above the upper end 1aa of the first plate 1a. Specifically, the bent portion 5da is located at a position farther from the connecting portion 1e than the upper end 1aa. In this state, the first plate 1a is not positioned in the longitudinal direction LD of the bent portion 5da.

As shown in FIG. 11, the operation plate 5 is slid toward the first plate 1a along the longitudinal direction LD. By this slide of the operation plate 5, the pin 7 is completely pulled out from the flange 2 a of the hook 2. In this way, the pin 7 can be moved from the locked position to the unlocked position.

When the pin 7 is completely pulled out from the flange 2a of the hook 2, as shown in FIG. 3, the hook 2 can be rotationally moved from the fixed position indicated by the solid line to the fixed release position indicated by the broken line. When the hook 2 moves to the fixed release position, the heavy load LO can be lifted by hooking a wire rope or the like on the hook 2 as shown in FIG. Thereby, the excavator 20 can perform a work as a so-called crane.

The method of fixing the hook 2 to the link member 1 is possible by the reverse operation to the above.

Next, the function and effect of this embodiment will be described.

According to the present embodiment, as described above, the movement of the pin 7 from the lock position to the lock release position is restricted by the link member 1. Specifically, as shown in FIG. 4, the dimension LC along the longitudinal direction LD of the portion of the pin 7 inserted into the flange portion 2a is the length of the gap between the tip of the grip portion 5d and the first plate 1a. It is larger than the dimension LA along the direction LD. Therefore, even if the operation plate 5 is moved in the longitudinal direction LD from the state shown in FIG. 4 until it comes into contact with the first plate 1a, the pin 7 does not completely come out of the flange 2a.

Therefore, the force that the elastic member 6 presses the operation plate 5 against the pin support portion 1j is weakened by vibration or the like. Absent. Accordingly, the hook 2 can be securely fixed to the link member 1 even if vibration occurs.

Also, when moving the pin 7 between the locked position and the unlocked position, there is no need to remove any member from the work tool link 10 with the hook. For this reason, the member removed from the work implement link 10 with the hook is not lost.

As described above, according to the present embodiment, it is possible to realize the work tool link 10 with the hook that can securely fix the hook 2 and that does not cause a risk of losing the member.

Further, according to the present embodiment, as shown in FIG. 4, the dimension LF along the longitudinal direction LD of the grip portion 5d is along the longitudinal direction LD of the gap between the first plate 1a and the pin support portion 1j. It is smaller than the dimension LE. For this reason, it becomes possible to arrange | position the holding part 5d in the clearance gap between the 1st plate 1a and the pin support part 1j.

Further, according to the present embodiment, as shown in FIG. 4, in a state where the bent portion 5ca faces the outer surface 1jb, the pin support portion 1j is positioned in the rotational direction of the bent portion 5ca around the longitudinal direction LD. is doing. Accordingly, when the operation plate 5 in the above state is rotated in a direction in which the bent portion 5ca approaches the connecting portion 1e, the bent portion 5ca comes into contact with the outer surface 1jb of the pin support portion 1j, and thus the operation plate 5 cannot rotate. As a result, even if vibration occurs, the operation plate 5 cannot rotate in the above direction, so that the pin 7 is prevented from moving from the lock position to the lock release position. Accordingly, the hook 2 can be more reliably fixed to the link member 1 even if vibration occurs.

Further, according to the present embodiment, as shown in FIG. 4, the dimension LA along the longitudinal direction LD of the gap between the tip 5daa of the bent portion 5da and the first plate 1a is such that the bent portion 5ca has the outer surface 1jb. The dimension LB is larger than the dimension LB along the longitudinal direction LD of the portion facing the. For this reason, by sliding the operation plate 5 toward the first plate 1a along the longitudinal direction LD, the bending portion 5ca can be slid to a position where it does not face the outer surface 1jb of the pin support portion 1j.

In a state where the bent portion 5ca does not face the outer surface 1jb, the restriction on rotation about the longitudinal direction LD of the operation plate 5 is released. For this reason, it becomes possible to rotate the operation plate 5 in the direction in which the bent portion 5ca approaches the connecting portion 1e.

Further, according to the present embodiment, as shown in FIG. 4, the elastic member 6 is interposed between the first plate 1a and the operation plate 5 so as to urge the operation plate 5 toward the pin support portion 1j. Has been placed. The pin 7 can be maintained at the locked position by the urging force of the elastic member 6, and the pin 7 is moved from the locked position to the unlocked position by operating the operation plate 5 against the urging force of the elastic member 6. It can also be made.

Further, according to the present embodiment, as shown in FIGS. 2 and 3, the pin 7 has the first pin portion 3 and the second pin portion 4 connectable to the first pin portion 3. . The operation plate 5 is held between the first pin portion 3 and the second pin portion 4. As a result, as described with reference to FIGS. 5 to 8, assembly of the work implement link 10 with the hook is facilitated.

Further, according to the present embodiment, as shown in FIG. 4, when the pin 7 is in the locked position, the first pin portion 3 is inserted into the through hole 1ja of the pin support portion 1j, and the second pin The part 4 is inserted into the through hole 1c of the first plate 1a. Thereby, since the pin 7 is supported by the link member at the two positions in the longitudinal direction LD through the through holes 1ja and 1c, the hook 2 can be firmly fixed by the pin 7.

In the above description, the work tool link 10 with the hook is described as a link member included in the link mechanism that connects the arm 23b and the bucket 23c. However, the link member included in the link mechanism that connects an attachment other than the bucket 23c to the arm 23b. It may be.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 link member, 1a 1st plate, 1aa upper end, 1b 2nd plate, 1c, 1fa, 1ga, 1ha, 1ia, 1ja, 1ka, 2ca, 5b through-hole, 1e connection part, 1f, 1g bucket side boss, 1h, 1i Cylinder side boss, 1j, 1k pin support part, 1jb outer surface, 2 hook, 2a collar part, 2aa eye hook member, 2ab latch member, 2b joint part, 2c hook support part, 2d support shaft, 3 1st pin part, 3a, 4a body part, 3b male screw part, 4 second pin part, 4b female screw part, 5 operation plate, 5a ring part, 5c anti-rotation part, 5ca bending part, 5cb extension part, 5d grip part, 5da Bending part, 5daa tip, 5db root part, 5dc inclined part, 6 elastic member, 7 pins, 10 working tool with hook , 20 hydraulic excavator, 21 traveling body, 21a crawler, 22 turning body, 22a cab, 22b driver's seat, 22c counterweight, 23 work machine, 23a boom, 23b arm, 23c bucket, 23d hydraulic cylinder, 23f bucket cylinder, 23g, 25 arm pins, 23h, 27 bucket pins, 24 bucket links, 26 link pins, 27a link bushes, 31, 32 tools, LO heavy load.

Claims (10)

Arm,
Attachments,
A work tool link with a hook included in a link mechanism that connects the arm and the attachment;
The work tool link with the hook is
A link member;
A hook having a flange and supported by the link member so as to be movable between a fixed position and a fixed release position;
A pin movable between a lock position inserted into the hook portion of the hook in the fixed position and a lock release position pulled out of the hook portion;
An elastic member for urging the pin to be in the locked position;
An operation plate that is attached to the pin and restricts movement of the pin from the lock position to the lock release position by contact with the link member in a state where the pin is biased by the elastic member and is in the lock position; Having a construction machine. 2. The device according to claim 1, wherein the pin is configured to be movable from the lock position to the lock release position by rotating the operation plate from a state where the pin is in the lock position. Construction machinery. The link member includes a first plate, a second plate, and a pin support portion disposed between the first plate and the second plate,
The pin has a shape extending in a longitudinal direction;
The operation plate has a gripping portion including a portion located between the first plate and the pin support portion and extending from the pin support portion side to the first plate side,
The construction machine according to claim 2, wherein a dimension of the grip portion along the longitudinal direction is smaller than a dimension of the first gap between the first plate and the pin support portion along the longitudinal direction. The pin support portion has a first surface that faces the first plate, a second surface that faces the second plate, and an outer surface that intersects each of the first surface and the second surface. ,
The operation plate has a detent portion including a bent portion whose tip is bent toward the pin support portion side,
The construction machine according to claim 3, wherein the pin support portion is positioned in a rotation direction of the bent portion with the longitudinal direction as a center in a state where the bent portion faces the outer surface. In a state where the bent portion faces the outer surface, the dimension along the longitudinal direction of the second gap between the tip of the grip portion and the first plate is such that the bent portion and the outer surface face each other. The construction machine according to claim 4, wherein the construction machine is larger than a dimension along the longitudinal direction in a portion to be operated. In the state where the bent portion is opposed to the outer surface, the dimension of the pin portion inserted into the flange portion along the longitudinal direction is the second dimension between the tip of the grip portion and the first plate. The construction machine according to claim 5, wherein the gap is larger than a dimension along the longitudinal direction of the gap. 7. The elastic member according to claim 3, wherein the elastic member is disposed between the first plate and the operation plate so as to bias the operation plate toward the pin support portion. Construction machinery as described in. The pin has a first pin portion and a second pin portion connectable to the first pin portion,
The construction machine according to any one of claims 3 to 6, wherein the operation plate is held between the first pin portion and the second pin portion. The pin support portion has a first through hole, the first plate has a second through hole,
The first pin portion is inserted into the first through hole when the pin is in the locked position, and the second pin portion is inserted into the second through hole. Construction machinery. A link member;
A hook having a flange and supported by the link member so as to be movable between a fixed position and a fixed release position;
A pin movable between a lock position inserted into the hook portion of the hook in the fixed position and a lock release position pulled out of the hook portion;
An elastic member for urging the pin to be in the locked position;
An operation plate that is attached to the pin and restricts movement of the pin from the lock position to the lock release position by contact with the link member in a state where the pin is biased by the elastic member and is in the lock position; Working tool link with hook.

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