JP2000095476A - Bucket link with hook - Google Patents

Abstract

PROBLEM TO BE SOLVED: To store a lifting hook having a large lifting load in a hook storing apace of a bucket link. SOLUTION: A lifting hook 27 oscillatably supported through a connecting shaft 26 between the bucket side bosses 24, 25 of a bucket link 15 is constituted of a drum-shaped boss 28 having a diameter-reduced part 28B, and a hook part 37 mounted on the diameter-reduced part 28B of the drum-shaped boss 28 through a bracket 32, a supporting shaft 34 and a suspension lug 36. As a result, the hook part 37 can be enlarged by an amount where the hook part 37 is mounted on the diameter-reduced part 28B of the drum-shaped boss 28, thus it is possible to store lifting hook 27 having a large lifting weight in the hook storing space 20 of the bucket link 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket link for connecting a bucket cylinder and a bucket of a hydraulic shovel, and more particularly to a bucket link with a hook provided with a hook for performing a load operation.

[0002]

2. Description of the Related Art In general, a hydraulic excavator suitably used for excavation work such as earth and sand is provided with a working device comprising a boom, an arm, a bucket and the like in front of an upper revolving unit, and the boom is raised and lowered by a boom cylinder. By rotating the bucket on the tip side of the arm by the bucket cylinder while raising and lowering the arm by the cylinder,
It is configured to excavate earth and sand.

Here, in order to carry out the work of hanging a relatively light load, there is known a hydraulic shovel in which a bucket link connecting a bucket cylinder and a bucket is provided with a hanging load hook (for example, a real excavator). JP-A-62-200688, JP-A-10-36065 and the like.

[0004] In this type of conventional hydraulic excavator, when excavating work such as earth and sand, the hanging load hook is stored in a space formed inside the bucket link. Then, the hanging load hook is projected from the space of the bucket link, and the load is lifted by the hanging load hook.

In the above-described conventional hydraulic excavator, a fixing pin can be axially moved on a side plate forming the bucket link in order to fix the suspended load hook in a state of being stored in the space of the bucket link during excavation work. And hook fixing means configured to hook the tip end side of the fixing pin projecting into the space of the bucket link on the hanging hook.

[0006]

SUMMARY OF THE INVENTION However, the above-mentioned prior art lifting hook has a boss rotatably supported by a bucket link via a connecting shaft, and a hook portion attached to the outer peripheral side of the boss. It consists of Therefore, when the outer diameter of the boss to which the hook is attached is large, the hook must be small enough to be stored in the space of the bucket link, and as a result, the hook can be lifted by the load hook. There is a problem that the amount of suspension load that can be performed is limited.

Further, in the above-mentioned hook fixing means according to the prior art, since a part of the fixing pin projects outside the bucket link, for example, when the soil and the like collide with the fixing pin during excavation work and the fixing pin is damaged, However, there is a problem that the hanging hook cannot be fixed in the space of the bucket link.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and a hanging hook having a large hanging load amount can be stored inside a bucket link. It is an object of the present invention to provide a hook-and-bucket link that can be reliably fixed at a storage position.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides two link plates arranged at intervals in the left and right directions and an interval in the width direction of each link plate. Two closing plates which are disposed and form a hook storage space inside together with the respective link plates, and a first closing plate which is provided at one longitudinal end of each of the link plates and the respective closing plates and is connected to a bucket cylinder. A connecting portion, a second connecting portion provided on the other end in the length direction of each of the link plates and the closing plates and connected to the bucket;
The present invention is applied to a hook-and-bucket link having a hook that is swingably supported between a storage position and a work position at a connection portion of the hook, and a hook fixing unit that fixes the hook when the hook is held at the storage position. Is done.

A feature of the invention according to claim 1 is that the hook is rotatably supported by the second connecting portion and the intermediate portion has a reduced diameter compared with both ends in the axial direction. And a hook attached to the reduced diameter portion of the drum-shaped boss.

[0011] With this configuration, the hook storage space can be expanded by the provision of the reduced diameter portion.
Therefore, it is possible to increase the size of the hook portion by the amount attached to the reduced diameter portion of the drum-shaped boss, and to store a hook having a large hanging load amount in the hook storage space.

A second aspect of the present invention is that the reduced diameter portion of the hourglass boss is provided with a grease nipple for lubricating the inner peripheral side of the hourglass boss.

[0013] With this configuration, the grease nipple is disposed in the diameter-reduced portion that is reduced in diameter from both ends in the axial direction of the drum-shaped boss. Even if collision occurs, it is possible to prevent the earth and sand from colliding with the grease nipple.

According to a third aspect of the present invention, there is provided a constitution in which a protection cylinder for covering the periphery of the grease nipple is provided at the reduced diameter portion of the drum-shaped boss.

With this configuration, even if, for example, soil or the like during excavation work collides with the reduced diameter portion of the drum-shaped boss, it is possible to prevent the soil or the like from colliding with the grease nipple by the protective cylinder. it can.

According to a fourth aspect of the present invention, at least one of the closing plates has an opening for inserting and removing the hook between the storage position and the working position.

With this configuration, the hook can swing between the storage position and the working position through the opening provided in the closing plate.

According to a fifth aspect of the present invention, the hook fixing means is movably inserted into at least one of the link plates, and is inserted into the hook portion of the hook when the hook is in the storage position. And a pin removal member which is provided so as to be removable from the fixed pin and prevents the fixed pin from coming off.

With this configuration, the hook is stored in the hook storage space, the fixing pin is inserted into the hook portion of the hook, and then the hook is stored simply by inserting the pin retaining member into the fixing pin. Can be fixed in position. On the other hand, the hook can be swung from the storage position to the working position by removing the pin retaining member from the fixing pin and releasing the fixing pin from the hook of the hook. When the hook is fixed at the storage position, the fixing pin and the pin retaining member are stored together with the hook in the hook storing space, so that soil and the like are fixed to the fixing pin and the pin retaining member during excavation work or the like. Collision can be prevented, and the hook can be securely fixed at the storage position.

According to a sixth aspect of the present invention, at least one of the closing plates is provided with a pin support which is located in the hook storage space and movably supports the fixing pin. .

With this configuration, the fixing pin can be supported at a plurality of positions by at least one of the link plates and the pin support, and the rigidity of the fixing pin with respect to the weight of the hook can be increased. Can be.

According to a seventh aspect of the present invention, the pin retaining member is provided on both sides of the pin support and the hook of the hook.

With this configuration, even if the fixing pin attempts to move in the axial direction due to vibration or the like during excavation work, the pin retaining member contacts the end face of the pin support to restrict the movement of the fixing pin. Therefore, the fixing pin can be prevented from coming off from the hook portion of the hook, and the hook can be fixed at the storage position.

The invention according to claim 8 is that the pin retaining member is constituted by a retaining pin which can be inserted into and removed from the fixing pin.

With this configuration, the fixing pin can be inserted and removed from the hook portion of the hook by simply inserting and removing the retaining pin from the fixing pin.
The work of fixing the hook to the storage position or taking out the hook from the storage position to the work position can be performed quickly.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bucket link with a hook according to the present invention will be described below in detail with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a hydraulic excavator, which is a crawler type lower traveling body 2, an upper revolving body 3 rotatably mounted on the lower traveling body 2, and a front of the upper revolving body 3. It is composed of a working device 4 and the like provided in the section. The working device 4 is attached to the upper revolving unit 3 so as to be able to move upward and downward, the arm 6 is attached to the distal end side of the boom 5 so as to be movable upward and downward, and is rotatably attached to the distal end side of the arm 6. A bucket 7, a boom cylinder 8 for driving the boom 5, an arm cylinder 9 for driving the arm 6, a bucket cylinder 10 for driving the bucket 7, and the like.

Here, the bucket 7 used in the present embodiment is configured as a backhoe type bucket, and the bottom plate of the bucket 7 is provided with two brackets 7A, 7A separated from each other in the left and right directions. . And bucket 7
Is rotatably supported on the distal end side of the arm 6 by a connecting shaft 11 inserted between the brackets 7A.

Reference numerals 12 and 12 denote first bucket links provided between the arm 6 and the rod 10A of the bucket cylinder 10 so as to be separated in the left and right directions. Is connected to the arm 6, and the distal end side is connected to the bucket cylinder 10 by the connecting shaft 14.
Of the rod 10A.

Reference numeral 15 denotes the rod 10 of the bucket cylinder 10.
A second bucket link with a hook provided between A and the bucket 7, and this bucket link 15 includes link plates 16, 17 and closing plates 18, 19, which will be described later, as shown in FIGS. , The cylinder-side bosses 22 and 23, the bucket-side bosses 24 and 25, the hanging load hook 27, the hook fixing mechanism 38, and the like.

Reference numerals 16 and 17 denote left and right link plates which constitute the bucket link 15, and these link plates 16 and 17 are arranged at fixed intervals in the left and right directions. Here, as shown in FIG. 3, a cylinder-side boss 22 described later is fixed to one end of the link plate 16 in the longitudinal direction by welding or the like, and a bucket-side boss 24 is fixed to the other end by welding or the like. ing. Further, a pin hole 16A into which a fixing pin 41 to be described later is slidably inserted is provided in the vicinity of the cylinder side boss 22 of the link plate 16, and extends horizontally through the center of the pin hole 16A. And a notch 16B through which the retaining pin 43 passes. On the other hand, similarly to the link plate 16, a cylinder-side boss 23 is fixed to one end of the link plate 17 in the longitudinal direction, and a bucket-side boss 25 is fixed to the other end.

Numerals 18 and 19 denote upper and lower closing plates which are arranged at regular intervals in the width direction of the link plates 16 and 17, respectively.
These closing plates 18 and 19 are fixed to both ends in the width direction of the link plates 16 and 17 by welding or the like. Here, each of the closing plates 18 and 19 forms a strong box structure together with each of the link plates 16, and forms a hook storage space 20 therein. Then, one of the closing plates 18 has a hook storage space 2.
An opening 18A opening to zero is formed. Reinforcing plates 21 are fixed to the inner surfaces of the link plates 16 and 17 and the closing plates 18 and 19 by welding or the like located near the cylinder-side bosses 22 and 23.

Reference numerals 22 and 23 denote left and right cylinder bosses as first connecting portions fixed to the longitudinal ends of the link plates 16 and 17 and the closing plates 18 and 19, respectively. A bush 22A is press-fitted on the circumferential side, and a bush 23A is press-fitted on the inner circumferential side of the cylinder-side boss 23. Then, the tip side of the rod 10A of the bucket cylinder 10 is inserted between the cylinder side bosses 22 and 23, and the left and right bucket links 12 are used to connect the respective cylinder side bosses 22 and 2 to each other.
3 with the cylinder side bosses 22, 23,
The rod 10 </ b> A of the bucket cylinder 10 and the bucket links 12, 12 are connected by a connection shaft 14.

Reference numerals 24 and 25 denote left and right bucket-side bosses as second connecting portions fixed to the other ends of the link plates 16 and 17 in the longitudinal direction. 24A is press-fitted, and a bush 25A is press-fitted on the inner peripheral side of the bucket-side boss 25. Then, a drum-shaped boss 28 described later is inserted between the bucket-side bosses 24 and 25, and the bucket-side bosses 24 and 25 are sandwiched between left and right brackets 7A and 7A provided on the bucket 7, and these bucket-side bosses 24 and 25 are inserted. Boss 24, 25, drum-shaped boss 28, bucket 7
Are connected by a connecting shaft 26.

Numeral 27 is arranged in the hook storage space 20,
The hanging load hook 27 is swingably supported on the bucket-side bosses 24 and 25 by the connecting shaft 26.
It comprises a drum-shaped boss 28 described later, a bracket 32, a support shaft 34, a suspension ring 36, a hook 37, and the like. The hanging load hook 27 is connected to the hook storage space 20 of the bucket link 15.
4 and a work position (the position shown in FIG. 7) taken out of the hook storage space 20 to the outside.

Reference numeral 28 denotes a drum-shaped boss rotatably provided between the bucket-side bosses 24 and 25 via a connecting shaft 26. The drum-shaped boss 28 has a large outer diameter D at both axial ends. Diameter portions 28A, 28A, and the middle portion in the axial direction is each large diameter portion 2
Reduced diameter portion 28 having an outer diameter d (d <D) smaller than 8A
It is formed in the shape of a stepped cylinder B. Therefore, the hook storage space 20 can be expanded by an amount corresponding to the provision of the reduced diameter portion 28B. A bush 29 is pressed into the inner peripheral side of the drum-shaped boss 28, and the connecting shaft 26 is slidably inserted into the inner peripheral side of the bush 29. The outer diameter D of the large diameter portion 28A of the drum-shaped boss 28
Has a smaller diameter (D <D ₀ ) than the outer diameter D ₀ of each bucket-side boss 24, 25.

Reference numeral 30 denotes a grease nipple provided on the reduced diameter portion 28B of the drum-shaped boss 28. The grease nipple 30 supplies grease or the like to the inner peripheral side of the bush 29. Here, the grease nipple 30 is attached to the drum-shaped boss 2
8, the tip of the grease nipple 30 is prevented from protruding more than the outer peripheral surface of the large diameter portion 28A of the drum-shaped boss 28, and soil and the like during excavation work collide with the grease nipple 30. This can be prevented.

Reference numeral 31 denotes a protective cylinder fixed around the grease nipple 30 to the reduced diameter portion 28B of the drum-shaped boss 28. The protection cylinder 31 is fixed to the reduced diameter portion 28B of the drum-shaped boss 28 by welding or the like. Grease nipple 3 from earth and sand during excavation work
0 is protected.

32, 32 are reduced diameter portions 28B of the drum-shaped boss 28
A pair of plate-like brackets projecting by welding or the like, each bracket 32 opposes at a fixed interval, and a shaft insertion hole 32A is formed at the center thereof. 33,
Reference numeral 33 denotes a plate-like spacer fixed to the opposing surfaces of the brackets 32 by welding or the like. A shaft insertion hole 33A is formed at the center of each spacer 33 concentrically with the shaft insertion hole 32A of the bracket 32. Have been.

Numeral 34 denotes a support shaft inserted through the shaft insertion hole 32A of the bracket 32 and the shaft insertion hole 33A of the spacer 33. The support shaft 34
Is swingably supported. And the support shaft 34
Is retained in the axial direction by a split pin 35.

Reference numeral 36 denotes an annular suspension ring disposed between the spacers 33. A support shaft 34 is inserted through the base end of the suspension ring 36, and a hook 3 protrudes from the distal end protruding from the spacer 33.
7 is attached. The suspension ring 36 is supported by the support shaft 3 in a state where the backlash is suppressed by the spacers 33.
It is configured to swing about 4.

Reference numeral 37 denotes a hook portion rotatably attached to the distal end side of the suspension ring 36 via a bearing or the like (not shown). The hook portion 37 hooks a wire rope or the like during a lifting operation. . Also, a wire rope or the like is attached to the hook portion 37.
A retaining plate 37A is provided to prevent the plate from coming off. Here, the hook portion 37 is attached to the reduced-diameter portion 28B of the drum-shaped boss 28 via the bracket 32, the support shaft 34, the suspension ring 36, and the like described above, so that, for example, the drum-shaped boss 28
Is larger than when attached to the large diameter portion 28A.

Numeral 38 denotes a hook fixing mechanism for fixing the hanging load hook 27 to the storage position.
Is composed of pin support plates 39 and 40, fixing pins 41, retaining pins 42 and 43, and the like, which will be described later.

Reference numerals 39 and 40 denote two pin support plates which are located in the hook storage space 20 and protrude from the closing plate 19 of the bucket link 15. In the state of being stored in the hook storage space 20, it is fixed by welding or the like to a position sandwiching the hook portion 37 of the hanging load hook 27. And each pin support plate 39,4
0 is a pin hole 3 into which the fixing pin 39 is slidably inserted.
9A and 40A are drilled.

Reference numeral 41 denotes a fixing pin for fixing the hanging load hook 27. The base end of the fixing pin 41 is slidably inserted into the pin hole 16A of one link plate 16. The tip of the fixing pin 41 is slidably inserted into a pin hole 39A of the pin support plate 39 and a pin hole 40A of the pin support plate 40. At this time, the fixing pin 41 is
7, the hanging hooks 27 are inserted into the hooks 37.
At the storage position. In this case, the fixing pin 41 is supported at three places by the link plate 16 and the pin support plates 39 and 40, so that the rigidity with respect to the weight of the hanging load hook 27 is increased.

Reference numeral 42 denotes a retaining pin as a pin retaining member which is provided at the distal end of the fixing pin 41 so as to be detachable, and as shown in FIG.
Beta pin (β pin) having an insertion / removal pin portion 42A inserted / removed into a small hole 41A drilled in the radial direction and an arcuate hook pin portion 42B hooked on the outer peripheral side of the fixed pin 41
Consists of

Reference numeral 43 denotes a retaining pin as a pin retaining member provided at an intermediate portion in the axial direction of the fixing pin 41. The retaining pin 43 is provided in a small hole 41B formed in the radial direction of the fixing pin 41. Consists of a spring pin inserted.

The retaining pin 42 is connected to the pin support plate 39.
When the retaining pin 43 comes into contact with the pin support plate 40, the fixing pin 41 is prevented from being removed from the pin support plates 39 and 40. On the other hand, the retaining pin 42 inserted into the distal end side of the fixing pin 41 is removed, and the fixing pin 41 is moved in the direction of arrow A in FIG.
The fixing pin 41 can be disengaged from the hook 37 of the hanging load hook 27 by passing through the notch 16B formed in the hook. Thereby, the hanging hook 27 can be displaced from the storage position shown in FIG. 4 to the work position shown in FIG.

The bucket link with a hook according to the present embodiment has the above-described configuration. When a lifting work is performed by a hydraulic shovel equipped with the bucket link with a hook, first, the tip side of the fixing pin 41 After removing only the retaining pin 42 inserted into the hook storage space 20 through the notch 16B of the link plate 16, the fixing pin 41 is moved in the direction of arrow A in FIG. By withdrawing the fixing pin 41 to the outside, the tip side of the fixing pin 41 becomes the pin hole 39A of the pin support plate 39 and the hook 3 of the hanging load hook 27.
7. Pull out the pin hole 40A of the pin support plate 40.

As a result, the fixing pin 41 is
7, the hanging load hook 27 swings around the connecting shaft 26, and is displaced from the storage position shown in FIG. 4 to the working position shown in FIG.

After the hanging load hook 27 is displaced to the working position, the fixing pin 41 is moved in the direction opposite to the direction indicated by the arrow A in FIG.
0 pin holes 40A and the pin holes 39A of the pin support plate 39, and then the fixing pins 4 protruding from the pin support plate 39.
The retaining pin 42 is inserted into the distal end side of 1 to hold the fixing pin 41 in the retaining state.

Thus, after holding the fixing pin 41 in the retaining state, the suspended load (both not shown) is suspended via the wire rope or the like on the hook portion 37 of the suspended load hook 27 displaced to the working position. For example, by swinging the upper swing body 3 while raising and lowering the boom 5 and the arm 6, it is possible to carry out a suspended load operation of transporting the suspended load to a desired position.

In this case, the hook storage space 20 can be expanded by providing the drum-shaped boss 28 constituting the hanging load hook 27 with the reduced diameter portion 28B. The hook portion 37 of the hanging load hook 27 is attached to the reduced diameter portion 28B of the drum-shaped boss 28 via the bracket 32, the support shaft 34, the suspension ring 36, and the like. Part 28A
The hook portion 37 can be made larger in size as compared with the case where it is attached to the vehicle, and a heavy load can be lifted by the load hook 27.

On the other hand, when excavating work using the bucket 7, first, with the retaining pin 42 being pulled out from the tip side of the fixing pin 41, the fixing pin 41 is inserted into the pin hole of the pin support plate 39. 39A, withdraw from the pin hole 40A of the pin support plate 40.

Next, the hanging load hook 27 is displaced about the connecting shaft 26 into the hook storage space 20 of the bucket link 15, and the hook 37 of the hanging load hook 27 is moved to the pin support plate 3.
Insert between 9, 40. Then, the distal end side of the fixing pin 41 is sequentially inserted into the pin hole 40A of the pin support plate 40, the hook portion 37 of the hanging load hook 27, and the pin hole 39A of the pin support plate 39, and then fixed to project from the pin support plate 39. The retaining pin 42 is inserted into the tip side of the pin 41.

As a result, the retaining pin 42 comes into contact with the pin support plate 39 to prevent the fixing pin 41 from being removed in the axial direction, and the hanging hook 27 can be fixed at the storage position by the fixing pin 41.

Thus, with the suspended load hook 27 fixed at the storage position in the hook storage space 20 of the bucket link 15, the boom cylinder 8 and the arm cylinder 9 raise and lower the boom 5 and the arm 6 while moving the bucket cylinder 10. By rotating the bucket 7 by the method described above, excavation work such as earth and sand can be performed by the bucket 7.

In this case, the fixing pin 41 and the retaining pin 4
2, 43, etc., together with the suspended load hook 27, the bucket link 1
5 is stored in the hook storage space 20 of FIG.
It is possible to prevent the fixing pin 41 from being detached from the hanging load hook 27 due to collision with the like. For this reason, the hanging load hook 27 can be reliably fixed in the hook storage space 20 of the bucket link 15 by the fixing pin 41. For example, the hanging load hook 27 is
5 to prevent smooth excavation work from being hindered.

Further, since the fixing pin 41 is supported at three places by the link plate 16 and the pin support plates 39 and 40, the rigidity of the fixing pin 41 with respect to the weight of the hanging hook 27 can be increased, and the fixing pin 41 can be increased. 41 allows the hanging load hook 27 to be securely fixed in the hook storage space 20.

In order to displace the hanging load hook 27 from the working position to the storage position, a simple operation of inserting and removing the retaining pin 42 at the tip end of the fixing pin 41 and moving the fixing pin 41 in the axial direction. With only this, the fixing pin 41 can be inserted into and removed from the hook portion 37 of the hanging load hook 27, and the work of fixing the hanging load hook 27 to the storage position or taking out from the storage position to the working position can be performed quickly. Can be.

The grease nipple 30 is connected to the drum-shaped boss 28
Of the grease nipple 3
The tip of the boss 28 is prevented from protruding more than the outer peripheral surface of the large-diameter portion 28A of the drum-shaped boss 28. Therefore, even if soil or the like collides with the drum-shaped boss 28 during excavation work, the soil and the like may be greased The grease nipple 30 can be prevented from being damaged by colliding with the nipple 30.

Further, since the protection cylinder 31 which covers the periphery of the grease nipple 30 is provided at the reduced diameter portion 28B of the drum-shaped boss 28, earth and sand at the time of excavation work can reduce the diameter of the reduced diameter portion 2 of the drum-shaped boss 28.
Even if it collides with 8B, the protection cylinder 31 can prevent the earth and sand from colliding with the grease nipple 30.

In the above-described embodiment, two pin supports for holding the hooks 37 of the hanging hooks 27 on the closing plate 19 in order to prevent the fixing pins 41 inserted into the pin holes 16A of the link plate 16 from being pulled out. Plates 39 and 40 are provided, and two retaining pins 42 and 4 sandwich the pin support plates 39 and 40 between the fixing pins 41.
3 is provided as an example. However, the present invention is not limited to this. For example, as shown in a modification shown in FIG.
Utilizing the fact that the end plates 7 are arranged opposite to each other, a long fixing pin 41 ′ whose leading end side is in contact with the link plate 17 is used. The fixing pin 41 ′ may be provided with a single retaining pin 42 abutting on the pin support plate 39.

In the above-described embodiment, the reinforcing plate 21 is provided on the inner surface of each of the link plates 16 and 17 and each of the closing plates 18 and 19 near the cylinder side bosses 22 and 23. The reinforcing plate 21 may be further disposed closer to the cylinder-side bosses 22 and 23, or the cylinder-side boss 2
The boss at the tip of the rod 10A of the bucket cylinder 10 disposed between the hook cylinders 2 and 23 is provided with a reduced diameter portion, and the reinforcing plate 21 is bent in accordance with the reduced diameter portion to thereby form the hook storage space 2.
0 can be further expanded, and the hook portion 37 of the hanging load hook 27 can be further enlarged.

Further, in the above-described embodiment, the case where the drum-shaped boss 28 having a thread-shaped groove is used has been described as an example. However, the present invention is not limited to this. For example, a V-shaped groove, A drum-shaped boss having a groove may be used.

Further, in the above-described embodiment, a retaining pin 42 composed of a beta pin as a pin retaining member,
Although the case where the retaining pin 43 made of a spring pin is used has been described as an example, the present invention is not limited to this. For example, a retaining ring such as a C ring or an E ring may be used.

[0067]

As described in detail above, according to the first aspect of the present invention, the hook stored in the hook storage space formed by the two link plates and the closing plate is moved to the second position of the bucket link. A drum-shaped boss that is pivotally supported by the connecting portion and has a reduced diameter portion whose intermediate portion is reduced in diameter compared to both ends in the axial direction,
Since it is constituted by the hook portion attached to the reduced diameter portion of the drum-shaped boss, the hook storage space can be expanded by the provision of the reduced diameter portion. Thus, the hook portion can be made larger by the amount attached to the reduced diameter portion of the drum-shaped boss, and a hook with a large hanging load can be stored in the space between the link plates.

According to the second aspect of the present invention, since the grease nipple for lubricating the inner peripheral side of the drum-shaped boss is provided at the reduced diameter portion of the drum-shaped boss, the excavation work can be performed. Even if the earth and sand at the time collides with the drum-shaped boss, it is possible to prevent the earth and sand from colliding with the grease nipple.

According to the third aspect of the present invention, since the protection cylinder that covers the periphery of the grease nipple is provided at the reduced diameter portion of the drum-shaped boss, the sand and the like during excavation work can reduce the diameter of the drum-shaped boss. Even if it collides with the diameter portion, it is possible to prevent the earth and the like from colliding with the grease nipple by the protection cylinder.

According to the fourth aspect of the present invention, at least one of the closing plates is provided with an opening for inserting and removing the hook between the storage position and the working position. Can swing between a storage position and a working position through an opening provided in the closing plate.

According to the fifth aspect of the present invention, the hook fixing means for fixing the hook in the hook storage space is provided with a fixing pin movably inserted into at least one of the link plates. , Because it is configured with a pin retaining member that is provided so that it can be inserted and removed from this fixed pin,
The hook can be fixed at the storage position simply by inserting a fixing pin into the hook portion of the hook stored in the hook storage space and inserting a pin retaining member into the fixing pin. In this case, since the fixing pin and the pin retaining member are stored together with the hook in the hook storage space, it is possible to prevent soil and the like from colliding with the fixing pin, the pin retaining member, and the like at the time of excavation work and the like. It can be reliably fixed at the storage position.

According to the sixth aspect of the present invention, at least one of the closing plates is provided with a pin support which is located in the hook storage space and movably supports the fixing pin. Therefore, the fixing pin can be supported at a plurality of locations by at least one of the link plates and the pin support. Therefore, the rigidity of the fixing pin with respect to the weight of the hook can be increased, and the hook can be reliably fixed at the storage position by the fixing pin.

According to the seventh aspect of the present invention, the pin retaining member is provided on both sides of the pin support and the hook of the hook, so that the fixing pin is moved by vibration during excavation work, for example. Even if you try to move in the axial direction, the pin retaining member abuts against the end surface of the pin support to restrict the movement of the fixing pin, so that the fixing pin can be prevented from coming off from the hook of the hook, and the hook can be securely held. It can be fixed in the storage position.

Further, according to the eighth aspect of the present invention, since the pin retaining member is constituted by the retaining pin which is detachably provided to the fixing pin, the retaining pin is inserted into and removed from the fixing pin, and the fixing pin is connected to the fixing pin. With only a simple operation to move in the axial direction, the fixing pin can be inserted and removed from the hook of the hook, and the work of fixing the hook to the storage position and removing the hook from the storage position to the work position quickly. It can be carried out.

[Brief description of the drawings]

FIG. 1 is an external view showing a hydraulic excavator provided with a bucket link with a hook according to an embodiment of the present invention.

FIG. 2 is an enlarged front view of the bucket link according to the embodiment, as viewed from the direction of arrows II-II in FIG. 1;

FIG. 3 shows a link plate of a bucket link, a boss on a cylinder side,
FIG. 3 is a cross-sectional view showing a bucket-side boss and the like, as viewed from a direction indicated by arrows III-III in FIG. 2.

FIG. 4 is a cross-sectional view showing a state in which a hanging load hook is fixed to a storage position in a bucket link, as viewed from the direction of arrows IV-IV in FIG. 2;

FIG. 5 is an enlarged view of a main part showing a pin support plate, fixing pins, retaining pins and the like in FIG. 4;

FIG. 6 is a front view similar to FIG. 2, showing a state in which a fixing pin is pulled out from a hook portion or the like of a hanging load hook.

FIG. 7 is a sectional view similar to FIG. 4, but showing a state in which the hanging load hook is displaced to a working position.

FIG. 8 is a front view similar to FIG. 2, showing a bucket link according to a modification of the present invention.

[Explanation of symbols]

 7 Bucket 10 Bucket cylinder 15 Bucket link 16, 17 Link plate 18, 19 Closing plate 18A Opening 20 Hook storage space 22, 23 Cylinder side boss (first connection part) 24, 25 Bucket side boss (second connection part) 27) Hanging load hook (hook) 28 Hourglass boss 28B Reduced diameter part 37 Hook part 38 Hook fixing mechanism (Hook fixing means) 39, 40 Pin support plate (Pin support) 41, 41 'Fixing pin 42, 43 Pin (pin retaining member)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Kenichi Takei, Inventor Kenichicho, Tsuchiura-shi, Ibaraki Pref.Hitachi Construction Machinery Co., Ltd. Inside the Tsuchiura Plant (72) Inventor Zenji Kaneko 650, Kandamachi, Tsuchiura City, Ibaraki Prefecture Hitachi Construction Machinery Co., Ltd. F term in the Tsuchiura Plant (reference) 2D012 FA00 3F004 NA07 PA03 PC01 PC07

Claims (8)

[Claims] 1. A system comprising two units arranged at intervals in the left and right directions.
Two link plates, two closing plates arranged at intervals in the width direction of the respective link plates and forming a hook storage space together with the respective link plates, and a length of each of the link plates and the respective closing plates. A first connecting portion provided on one end side in the vertical direction and connected to a bucket cylinder; a second connecting portion provided on the other end side in the length direction of each link plate and each closing plate and connected to a bucket; A hook disposed in the hook storage space and supported by the second connecting portion to be swingable between a storage position and a working position; and a hook for fixing the hook when the hook is held in the storage position. A hook link provided with fixing means, wherein the hook is rotatably supported by the second connecting portion, and has a reduced diameter portion whose intermediate portion is reduced in diameter as compared with both end portions in the axial direction. Attached to the drum-shaped boss and the reduced diameter part of the drum-shaped boss A bucket link with a hook, characterized by comprising a hooked portion. 2. The bucket link with a hook according to claim 1, wherein a grease nipple for lubricating an inner peripheral side of the drum-shaped boss is provided in a reduced diameter portion of the drum-shaped boss. 3. The bucket link with a hook according to claim 2, wherein a protection cylinder that covers the periphery of the grease nipple is provided at the reduced diameter portion of the hourglass boss. 4. A structure in which at least one of the closing plates is provided with an opening for inserting and removing the hook between a storage position and a working position.
Or the bucket link with a hook described in 3. 5. The hook fixing means is movably inserted into at least one of the link plates, and is inserted into a hook portion of the hook when the hook is in a storage position. 5. The bucket link with a hook according to claim 1, 2, 3 or 4, comprising a fixing pin which can be inserted into and removed from the fixing pin and a pin retaining member which prevents the fixing pin from coming off. 6. A structure in which at least one of the closing plates is provided with a pin support positioned in the hook storage space to movably support the fixing pin. The bucket link with a hook according to 3, 4, or 5. 7. The bucket link with hook according to claim 6, wherein the pin retaining member is provided at both sides of the pin support and the hook of the hook. 8. The bucket link with a hook according to claim 1, wherein the pin retaining member comprises a retaining pin detachably provided to the fixing pin. .