JP2001226078A - Bucket link device with hook - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly and easily perform such operations as to store and take out a hook into and from a hook storage space of a bucket link. SOLUTION: A hook holding mechanism 35 having a hook guide 36, a latch plate 46 rotatingly displacing between a forward position where a load lifting hook 27 is held in a storage position and a backward position where the load lifting hook 27 is allowed to move to a working position, and a spring 48 always energizing the latch plate 46 toward the forward position is provided in the hook storage space A of a bucket link 16. By merely moving the load lifting hook 27 in the hook storage space A, the latch plate 46 energized by the spring 48 is engaged with the load lifting hook 27, and the load lifting hook 27 can be held at the storage position. In addition, by merely moving the latch plate 46 to the backward position against the spring 48 so as to separate the latch plate 46 from the load lifting hook 27, the load lifting hook 27 can be moved to the working position.

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 device with a hook provided with a hook for performing a lifting 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). 62-200688, JP-A-10-36065, etc.).

[0004] In the prior art hydraulic excavator, when excavation work such as earth and sand is performed, the suspended load hook is stored in a hook storage space formed inside the bucket link. The hanging load hook is taken out from the hook storage space of the bucket link, and the load is lifted by the hanging load hook.

[0005]

However, according to the conventional hydraulic excavator, the block is fixedly provided in the hook storage space of the bucket link, and the head is connected between the head of the bolt screwed to the block and the hook. By inserting a split washer into the hook, the suspended load hook is held in the hook storage space by the block and the split washer.

Therefore, it is necessary to remove the split washers from the bolts when removing the hanging load hook from the hook storage space of the bucket link at the time of hanging load operation or the like. It is necessary to insert a split washer between the head and the hook.

As described above, the work of taking out the hanging load hook from the hook storage space of the bucket link and the work of storing the hanging load hook in the hook storage space are not only complicated, but also in a dark work site such as at night. However, there is a problem that it is difficult to insert the split washer between the head of the bolt and the hook when the hook is stored.

The present invention has been made in view of the above-described problems of the prior art, and can quickly and easily perform an operation of storing a hook in a hook storage space of a bucket link and an operation of removing a hook from a hook storage space. It is an object of the present invention to provide a bucket link device with a hook as described above.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to connecting between a first connecting portion on the bucket cylinder side and a second connecting portion on the bucket side to form a hook storage space therein. A link formed and a hook that is swingably supported by the second connecting portion and moves between a storage position stored in the hook storage space and a work position separated from the hook storage space; The present invention is applied to a bucket link device with a hook including a hook holding means for holding a hook at the storage position.

A feature of the present invention is characterized in that the hook holding means is provided in the hook storage space and extends along the moving direction of the hook, and is provided on the hook guide so as to be able to advance and retreat. In the advanced position, the hook is fixed to the hook guide and held in the storage position, and in the retracted position, the latch member allows the hook to move to the working position. And a biasing means for biasing.

With this configuration, the latch member is normally urged to the extension position by the urging means, and the hook is fixed to the hook guide at this extension position, and the hook is held at the storage position. Also, by moving the latch member to the retracted position against the urging means, the hook can be removed from the hook guide, and the hook can be moved from the storage position to the working position.

According to a second aspect of the present invention, the hook guide sandwiches the hook from the left and right sides in the hook storage space.
It is constituted by a right guide portion, and the latch member is
The configuration is such that one of the right guides is provided so as to be able to advance and retreat.

With this configuration, when the hook is moved to the storage position, the hook is sandwiched between the left and right sides of the hook guide in the hook storage space by the latch member. Fixed.

According to a third aspect of the present invention, the latch member is constituted by a latch plate provided so as to be rotatable in a direction orthogonal to the moving direction of the hook by using a pin for the hook guide, and the latch plate is provided with the urging member. The structure is such that it is always biased toward the advanced position by means.

With this configuration, the latch plate is normally urged to the advanced position by the urging means, and engages with the hook at the advanced position to hold the hook in the storage position. Further, the hook can be moved from the storage position to the working position by rotating the latch plate to the retracted position against the urging means and detaching the latch plate from the hook.

According to a fourth aspect of the present invention, the latch member is constituted by a latch bar provided on the hook guide so as to be displaceable in a direction perpendicular to the moving direction of the hook, and the latch bar is moved to an advanced position by the urging means. That is, it is configured to be constantly biased toward.

With this configuration, the latch bar is normally urged to the advanced position by the urging means, and engages with the hook at the advanced position to hold the hook in the storage position. In addition, the hook can be moved from the storage position to the working position by displacing the latch bar to the retracted position against the urging means and detaching the latch bar from the hook.

According to a fifth aspect of the present invention, a lock member is provided between the hook guide and the latch member for holding the latch member in a state where the latch member is locked at the advanced position.

With this configuration, when the latch member is locked in the advanced position using the lock member, the latch member can be moved to the retracted position unless the locked state of the latch member by the lock member is released. Without
The hook can be kept in the storage position.

[0020]

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

First, FIGS. 1 to 7 show a bucket link device with hooks according to a first embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a hydraulic shovel applied to the present embodiment. The hydraulic shovel 1 is a crawler type lower traveling body 2 and an upper revolving body which is mounted on the lower traveling body 2 so as to be pivotable. 3, generally constituted by a working device 4 and the like provided at the front of the upper revolving unit 3.

The working device 4 has a boom 5 attached to the upper swing body 3 so as to be able to move upward and downward, an arm 6 attached to the tip of the boom 5 so as to be able to move upward and downward, and is rotatable toward the tip of the arm 6. , 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.

The bucket 7 used in the present embodiment is configured as a backhoe type bucket, and the bottom plate of the bucket 7 has two brackets 7A, 7A (only one is shown) that are separated in the left and right directions. ) Is provided. The 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 denote two first bucket links (only one is shown) 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.
The base end of these bucket links 12 is connected to the arm 6 by a connecting shaft 13, and the distal end is connected to the tip of the rod 10 </ b> A of the bucket cylinder 10 by a connecting shaft 14.

Next, reference numeral 15 denotes a bucket link device with hooks according to the present embodiment. The bucket link device 15 with hooks is provided between the rod 10A of the bucket cylinder 10 and the bucket 7, and is shown in FIGS. As shown in FIG. 3, it is roughly constituted by a later-described bucket link 16, a suspended load hook 27, a hook holding mechanism 35, and the like.

Reference numeral 16 denotes a bucket link device 15 with a hook.
The bucket link 16 includes link plates 17 and 18 and blocking plates 19 and 2 which will be described later.
0 or the like.

Reference numerals 17 and 18 denote left and right link plates which constitute the bucket link 16, respectively. These link plates 17 and 18 are arranged at fixed intervals in the left and right directions.

Numerals 19 and 20 denote closing plates arranged at regular intervals in the width direction of the link plates 17 and 18. These closing plates 19 and 20 are welded to both ends of the link plates 17 and 18 in the width direction. Has been fixed by.

As described above, the bucket link 16 is formed in a strong box structure by the link plates 17 and 18 and the closing plates 19 and 20, and the cylinder-side bosses 22 and 2 described later.
3 and the bucket-side bosses 24 and 25.

Here, inside the bucket link 16,
A hook storage space A for storing the hanging load hook 27 is formed, and an opening 20A that opens into the hook storage space A is formed in the closing plate 20 so that the hanging load hook 27 can be put in and out of the hook storage space A. . A substantially U-shaped reinforcing plate 21 is fixed between the cylinder-side bosses 22 and 23 and the closing plates 19 and 20 by welding or the like.

Reference numerals 22 and 23 denote left and right cylinder-side bosses as first connecting portions fixed to one end of the link plates 17 and 18 and the closing plates 19 and 20 in the longitudinal direction. A bush 22A is fitted on the peripheral side, and a bush 23A is fitted on the inner peripheral 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 17 and 18 and the closing plates 19 and 20 in the longitudinal direction. A bush 24A is inserted on the inner peripheral side, and a bush 25A is inserted on the inner peripheral side of the bucket-side boss 25. Then, a hook boss 28 to be described later is inserted between the bucket-side bosses 24 and 25, and the bucket-side bosses 24 and 25 are provided by left and right brackets 7A and 7A provided on the bucket 7.
25, these bucket-side bosses 24, 2
5, boss 28 for hook, bracket 7A of bucket 7,
7A is connected by a connection shaft 26.

Reference numeral 27 denotes a hanging load hook which is disposed in the hook storage space A and is swingably supported by the bucket side bosses 24 and 25 by a connecting shaft 26. The hanging load hook 27 is a hook boss 28 described later. , Bracket 29, support shaft 31,
It consists of a suspension ring 33, a hook 34 and the like.

When the excavator 1 excavates, for example, the suspended load hook 27 holds the storage position (the position shown in FIG. 2) stored in the hook storage space A of the bucket link 16 by the hook holding mechanism 35. During the suspended load operation, the bucket link 16 is detached from the hook storage space A and moves to a work position taken out of the bucket link 16 as shown by a two-dot chain line in FIG.

Reference numeral 28 denotes a cylindrical hook boss rotatably provided between the bucket-side bosses 24 and 25 via a connecting shaft 26. A bush 28A is provided on the inner peripheral side of the hook boss 28.
Are inserted into the bush 28A, and the connecting shaft 26
Are slidably inserted.

Reference numerals 29, 29 denote a pair of brackets protruding from the outer periphery of the hook boss 28 by welding or the like, and the brackets 29 face each other at a fixed interval. Also,
Rectangular spacers 30, 30 are fixed to surfaces of the brackets 29 facing each other by welding or the like.

Reference numeral 31 denotes each bracket 29 and each spacer 30
The support shaft 31 is axially stopped by a split pin 32 and supports the suspension ring 33 between the spacers 30 so as to be swingable.

Reference numeral 33 denotes an annular suspension ring disposed between the spacers 30. A support shaft 31 is inserted through the base end of the suspension ring 33, and a hook 3 protrudes from the distal end protruding from the spacer 30.
4 are attached. The suspension ring 33 is supported by the support shaft 3 in a state where the backlash is suppressed by the spacers 30.
It is configured to swing about 1.

Numeral 34 denotes a hook portion rotatably attached to the distal end side of the suspension ring 33 via a bearing or the like (not shown). The hook portion 34 hooks a wire rope or the like at the time of hanging load operation. is there. In addition, a wire rope or the like is attached to the hook portion 34.
A retaining member 34A is provided to prevent the member 4 from coming off.

The reference numeral 35 designates the hanging load hook 27 as a hook storage space A.
The hook holding mechanism 35 is used to hold a hook at a storage position stored in the hook guide mechanism.
6, a latch plate 46, a spring 48 and the like.

A hook guide 36 is located in the hook storage space A and fixed to the closing plate 19 of the bucket link 16. As shown in FIGS. 4 to 6, the hook guide 36 is substantially made of a steel plate or the like. A rectangular substrate 38 formed in a rectangular shape and fixed to the closing plate 19 by using four bolts 37; and a moving direction (the direction of arrow B) of the hanging load hook 27 fixed to the substrate 38 by welding or the like. One first guide plate 39 extending along the first guide plate 39 is fixed to the base plate 38 by welding or the like so as to form a pair with the first guide plate 39 in the left and right directions. And two second guide plates 40, 40 extending in front of each other and facing each other at regular intervals in the front and rear directions.

Here, as shown in FIG. 6, a guide space 41 is formed between the first guide plate 39 and each of the second guide plates 40 so as to extend in the moving direction of the hanging load hook 27. By inserting the hook portion 34 of the hanging load hook 27 into the guide space 41, each guide plate 39, 40
7 are sandwiched from both the left and right sides.
The distal ends of the guide plates 39 and 40 are formed in an arc shape to guide the hook 34 of the hanging load hook 27 to the guide space 41. Each guide plate 40 is formed with a lever guide groove 42 for guiding a release lever 47 described later.

Reference numeral 43 denotes a cylindrical spacer for connecting the two guide plates 40. The spacer 43 is fixed to each guide plate 40 by bolts 44, 44 at both ends in the axial direction. This is for setting the interval between the plates 40.

Reference numeral 45 denotes a support pin positioned near the spacer 43 and inserted through the two guide plates 40. The support pin 45 is made of, for example, a steel rod or the like, and has a large-diameter flange at one end. 45A is integrally provided, and a retaining pin or the like (not shown) is detachably attached to the other end. And
The support pins 45 are inserted through the respective guide plates 40 and rotatably support the latch plates 46 between the two guide plates 40.

Reference numeral 46 denotes a latch plate as a latch member rotatably provided on the hook guide 36 via the support pin 45. As shown in FIG. A hook engaging portion 46A that engages with the hook 34;
The hook guide 3 is configured to have a pressed portion 46 </ b> B pressed by the hook 34 of the suspended load hook 27.
6 are disposed between the guide plates 40.

Then, the latch plate 46 moves in the moving direction of the hanging hook 27 about the support pin 45 (arrow B in FIG. 6).
6) between the advanced position protruding into the guide space 41 as shown by the solid line in FIG. 6 and the retracted position retracted from the guide space 41 as shown by the two-dot chain line. It is displaced. The latch plate 46 secures the suspended load hook 27 to the hook guide 36 and holds it in the storage position by engaging the hook engaging portion 46A with the hook portion 34 in the advanced position, and in the retracted position. By detaching the portion 46A from the hook portion 34, the hanging load hook 27 is allowed to move from the storage position to the work position.

Reference numeral 47 denotes a bar-shaped release lever fixedly provided on the latch plate 46. The release lever 47 extends forward and backward from the latch plate 46 and engages with the lever guide groove 42 of each guide plate 40. are doing.

The release lever 47 is connected to the latch plate 46.
Is gripped by an operator or the like when rotating from the advanced position to the retracted position, and moves along the lever guide groove 42. Further, the release lever 47 regulates the advance position of the latch plate 46 by abutting on the tip of the lever guide groove 42.

Reference numerals 48, 48 denote two springs provided as biasing means provided between the guide plates 40 of the hook guide 36 and the latch plate 46, respectively.
5 in the state of being loosely inserted on the outer peripheral side of each second guide plate 40.
And the latch plate 46 respectively. Each spring 48 is latched at one end by a spacer 43 connecting the two guide plates 40 and at the other end by a release lever 47 fixed to the latch plate 46. 46 is constantly biased toward the advanced position.

The bucket link device 15 with hooks according to the present embodiment has the above-described configuration.
A case in which the hydraulic excavator 1 provided with the hooked bucket link device 15 performs a load operation will be described.

In this case, the hanging load hook 27 is in the storage position shown in FIG. 2, and the hook portion 34 of the hanging load hook 27 is, as shown in FIG. The hook engagement portion 46A of the latch plate 46 urged by the springs 48 to the advanced position is engaged with the inner peripheral side of the hook portion 34 and inserted into the guide space 41 formed between them. .

In this state, the operator grips the release lever 47 and pivotally displaces the latch plate 46 to the retracted position against the spring 48, as shown by a two-dot chain line in FIG. The hook engaging portion 46A of the hanging hook 34 is
Let go. Thereby, the hanging load hook 27 can be removed from the hook guide 36, and the hanging load hook 27
It is possible to move from the storage position to the working position indicated by a two-dot chain line in FIG. 1 around the connecting shaft 26.

Then, a suspended load (both not shown) is suspended via a wire rope or the like from the suspended load hook 27 displaced to the working position, for example, while the boom 5 and the arm 6 are raised and lowered, the upper revolving unit 3 is moved upward. By swinging the, it is possible to perform a suspended load operation of transporting the suspended load to a desired position.

Here, when the worker releases the release lever 47 after the hanging load hook 27 moves to the working position, the latch plate 46 is automatically turned toward the advanced position by the spring force of each spring 48. Move. When the release lever 47 comes into contact with the tip of the lever guide groove 42 formed in each guide plate 40, the latch plate 46 holds the advanced position.

Next, when the hanging hook 27 is moved from the working position to the storage position in order to perform the excavation work using the bucket 7, the worker grips the hanging load hook 27, and Is moved around the connecting shaft 26 into the hook storage space A, and as shown in FIG.
7 is gradually inserted into the guide space 41 of the hook guide 36.

At this time, the latch plate 46 holds the advanced position by each spring 48, and the hook engaging portion 46A and the pressed portion 46B protrude into the guide space 41.
4 is pressed against the pressed portion 46B of the latch plate 46 so that the latch plate 46
From the advanced position to the retracted position. And
The outer peripheral side of the hook portion 34 is a hook engaging portion 46A of the latch plate 46.
The latch plate 46 is automatically returned to the advanced position by the spring force of the spring 48.

Thus, the hook portion 34 of the hanging load hook 27 is
Is hooked from both the left and right sides by the guide plates 39 and 40 of the hook guide 36, and the hook engaging portion 46A of the latch plate 46 at the advanced position engages with the inner peripheral side of the hook portion 34. , And the load hook 27 is connected to each of the guide plates 39 and 40.
It can be stably held at the storage position while being fixed in between.

Then, the bucket 7 is rotated by the bucket cylinder 10 and the like while the boom cylinder 8 and the arm cylinder 9 raise and lower the boom 5 and the arm 6 while the hanging load hook 27 is held at the storage position. Excavation work of earth and sand.

Thus, according to the bucket link device 15 with hooks according to the present embodiment, the hook guide 36 and the hook guide 36 are provided in the hook storage space A of the bucket link 16 in order to hold the hanging load hook 27 in the storage position. A latch plate 46 pivotally displaced between an advanced position for holding the load hook 27 in the storage position and a retracted position allowing the suspended load hook 27 to move to the working position; And a hook holding mechanism 35 provided with a spring 48 that is constantly biased.

When the hanging load hook 27 is moved to the storage position, the hanging load hook 27 is inserted into the guide space 41 of the hook guide 36 so that the latch plate 46 is moved.
Is moved to the retracted position by being pushed by the hanging load hook 27, and when the hanging load hook 27 is inserted into the guide space 41, the latch plate 46 is automatically moved to the advanced position by the spring 48. Thus, the hanging load hook 27 can be stably fixed between the respective guide plates 39 and 40 simply by moving the hanging load hook 27 to the storage position, and can be quickly and easily held at the storage position. Can be.

When taking out the suspended load hook 27 from the storage position to the working position, the latch plate 46 at the advanced position is moved to the retracted position against the spring 48, and the suspended load hook 27 is moved.
By simply releasing the latch plate 46 from the
Can be quickly and easily moved to the working position.

As described above, the operation of storing the suspended load hook 27 in the hook storage space A of the bucket link 16 and the operation of removing the suspended load hook 27 from the hook storage space A can be performed quickly and easily. For example, even in a dark work site such as at night, the hanging load hook 27 can be securely stored in the hook storage space A.

Next, FIGS. 8 and 9 show a bucket link device with hooks according to a second embodiment of the present invention.
A feature of the present embodiment is that the configuration of the hook holding mechanism is simplified. In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 50 denotes a bucket link device with a hook according to the present embodiment. The bucket link device 50 with a hook comprises a bucket link 16 and a hanging load hook 27.
And a hook holding mechanism 51 employed in the present embodiment in place of the hook holding mechanism 35 used in the first embodiment. Here, the hook holding mechanism 51 is roughly constituted by a hook guide 52, a latch plate 61, a spring 62, and the like, which will be described later.

A hook guide 52 is located in the hook storage space A and fixed to the closing plate 19 of the bucket link 16. The hook guide 52 is formed by, for example, bending a U-shaped steel plate. The substrate 54 is formed integrally by this and fixed to the closing plate 19 using two bolts 53.
And the load hook 2 is bent substantially at a right angle from the substrate 54.
7, extending in the direction of movement of the left and right,
It is composed of right guide plates 55 and 56.

Here, between the guide plates 55 and 56,
A guide space 57 extending in the moving direction of the suspended load hook 27 (the direction indicated by the arrow B in FIG. 9) is formed, and by inserting the suspended load hook 27 into the guide space 57, each guide plate 5 is moved.
5 and 56 sandwich the hook portion 34 of the hanging load hook 27 from both the left and right sides. Then, each guide plate 55, 56
A V-shaped inclined surface is formed on the distal end side for guiding the hook portion 34 of the hanging load hook 27 to the guide space 57.

Also, on the tip side of one guide plate 55,
A screw hole 55A for screwing a bolt 59 to be described later is formed, and a stopper 58 that defines the advance position of the latch plate 61 by being brought into contact with the latch plate 61 by welding or the like is provided near the screw hole 55A. It is fixed.

Reference numeral 59 denotes a long bolt which is screwed into the screw hole 55A of the guide plate 56 and extends forward and backward.
Reference numeral 9 has a bolt head 59A, and is fixed to the guide plate 56 while being positioned in the axial direction by the nut 60. The bolt 59 rotatably supports the latch plate 61 instead of the support pin 45 according to the first embodiment.

Reference numeral 61 denotes a hook guide 5 via a bolt 59.
The latch plate 61 is a latch member rotatably provided on the second guide plate 56. The latch plate 61
7 is configured as a plate having a hook engaging portion 61A that engages with the hook portion 34 and a pressed portion 61B that is pressed by the hook portion 34 of the hanging load hook 27.

Here, the latch plate 61 rotates about the bolt 59 in a direction orthogonal to the moving direction of the hanging load hook 27 (the direction indicated by the arrow B in FIG. 9), and a guide space indicated by a solid line in FIG. It is rotationally displaced between an advanced position protruding into the inside 57 and a retracted position retracted from the guide space 57 shown by a two-dot chain line. The latch plate 61 holds the suspended load hook 27 in the storage position by fixing the hook 33 to the hook guide 52 by engaging the hook engaging portion 61A with the hook 34 in the advanced position, and engages the hook in the retracted position. By detaching the portion 61A from the hook portion 34, the hanging load hook 27 is allowed to move from the storage position to the work position.

Reference numeral 62 denotes a single spring as biasing means provided between the guide plate 55 of the hook guide 52 and the latch plate 61. The spring 62 is loosely inserted on the outer peripheral side of the bolt 59. Thus, it is disposed between the guide plate 55 and the latch plate 61. The spring 62 has one end hooked on the guide plate 55 and the other end hooked on the latch plate 61, so as to constantly bias the latch plate 61 toward the advanced position. The leading end of the latch plate 61 urged by the spring 62 abuts against the stopper 58 to maintain the advanced position.

The bucket link device 50 with hooks according to the present embodiment has the above-described configuration. When the hanging load hook 27 is stored in the hook storage space A of the bucket link 16 from the work position, the work is performed. Person is hanging load hook 2
7 and hold the suspended load hook 27 to the bucket link 16.
The hook portion 34 of the hanging load hook 27 is gradually inserted into the guide space 57 of the hook guide 52.

At this time, the latch plate 61 holds the advanced position by the spring 62, and the hook engaging portion 61A protrudes into the guide space 57. However, the outer peripheral side of the hook portion 34 is pressed against the pressed portion 61B of the latch plate 61. The latch plate 61 pivots from the advanced position to the retracted position against the spring 62 by contacting and pressing this. Then, when the outer peripheral side of the hook portion 34 gets over the hook engaging portion 61A of the latch plate 61,
The latch plate 61 automatically returns to the advanced position by the spring force of the spring 62.

As a result, the hook portion 34 of the hanging load hook 27
Is hooked from the left and right sides by the guide plates 55 and 56 of the hook guide 52, and the hook engaging portion 61A of the latch plate 61 at the advanced position engages with the inner peripheral side of the hook portion 34. , The hanging load hook 27 is connected to each of the guide plates 55 and 56.
It can be quickly and easily stored in the storage position while being fixed in between.

On the other hand, the hanging load hook 27 is
When taking out from the, the operator grips the latch plate 61,
By rotating the latch plate 61 from the advanced position to the retracted position against the spring 62, the hook engaging portion 61A of the latch plate 61 is disengaged from the hook portion 34 of the hanging load hook 27. Thereby, the hanging load hook 27 can be detached from the hook guide 52 and can be quickly and easily taken out to the work position.

Further, in the hook holding mechanism 51 used in the present embodiment, the substrate 54 of the hook guide 52 and each of the guide plates 55 and 56 are integrally formed by bending a steel plate. Since the latch plate 61 is rotatably supported using the screwed bolt 59, the configuration can be simplified as compared with the hook holding mechanism 35 used in the above-described first embodiment. it can.

Next, FIGS. 10 to 12 show a third embodiment of the present invention.
The hook link device with hook according to the embodiment of the present invention is shown, and the feature of this embodiment is that a hook bar is provided with a latch bar which is displaceable in a direction orthogonal to the moving direction of the hook. Note that, in the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the figure, reference numeral 70 denotes a bucket link device with a hook according to the present embodiment.
And a hook holding mechanism 71 employed in the present embodiment in place of the hook holding mechanism 35 used in the first embodiment. Here, the hook holding mechanism 71 is generally constituted by a hook guide 72, a latch bar 78, a spring 82, and the like, which will be described later.

Reference numeral 72 denotes a hook guide which is located in the hook storage space A and fixed to the closing plate 19 of the bucket link 16. The hook guide 72 is formed of, for example, a steel plate or the like. And a left and right guide plate 75, which is fixed to the substrate 74 by welding or the like and extends along the moving direction of the hanging hook 27 (the direction of arrow B in FIG. 12). 76.

Then, between the guide plates 75 and 76,
A guide space 77 extending in the moving direction of the suspended load hook 27 is formed, and by inserting the suspended load hook 27 into the guide space 77, each of the guide plates 75 and 76 is connected to the suspended load hook 2.
7 are sandwiched from both the left and right sides.
The one guide plate 76 has an insertion hole 76A through which the latch bar 78 is slidably inserted.

Here, of the link plates 17, 18 constituting the bucket link 16, the link plate 18 facing the guide plate 76 is provided with a latch bar 78 at a position corresponding to the insertion hole 76 A of the guide plate 76. An insertion hole 18A that is slidably inserted is formed.

Reference numeral 78 denotes a latch rod as a latch member movably provided on the guide plate 75 of the hook guide 72.
The latch bar 78 is formed of, for example, a cylindrical steel bar or the like. The latch rod 78 has one end inserted into the insertion hole 76A of the guide plate 76 and the other end inserted through the insertion hole 18A of the link plate 18, and
Is displaced in a direction orthogonal to the moving direction (direction B).

Here, one end of the latch rod 78 has a hook engaging portion 78A which engages with the hook 34 of the hanging load hook 27.
And a pressed surface portion 78B which is inclined at an angle θ with respect to the axial direction and is pressed by the hook portion 34 of the hanging load hook 27. Further, between the insertion hole 18A of the link plate 18 and the latch bar 78, a rotation stop member (not shown) such as a rotation stop key is provided.

Therefore, the latch rod 78 is moved
In a state where B is stopped so as to always face the hook portion 34 of the hanging load hook 27, the guide space 7 indicated by a solid line in FIG.
7 moves in the axial direction between an advanced position protruding into the inner space 7 and a retracted position retracted from the guide space 77 indicated by a two-dot chain line. The latch rod 78 holds the suspended load hook 27 in the storage position by engaging the hook engaging portion 78A with the hook portion 34 at the advanced position, and hooks the hook engaging portion 78A at the retracted position. The detachment from the section 34 allows the hanging load hook 27 to move from the storage position to the work position.

Reference numeral 79 denotes a gripping tool provided outside the bucket link 16 and provided on the other end side of the latch bar 78. The gripping tool 79 is formed by, for example, bending a wire or the like into a U-shape. It is rotatably attached to the other end of the rod 78. The grip 79 is to be gripped by an operator when the latch bar 78 is moved from the advanced position to the retracted position.

Reference numeral 80 denotes a pin which is provided near the guide plate 75 and is provided on the latch bar 78. The pin 80 is inserted so as to be removable in the radial direction of the latch bar 78, and both ends of the pin 80 are provided. Projecting from. And the pin 80
When the latch rod 78 moves to the advanced position, the guide plate 7
6, the length of the latch rod 78 projecting into the guide space 77 is defined.

Reference numeral 81 denotes an annular spring receiving plate provided between the pin 80 and the link plate 18 and provided on the outer peripheral side of the latch bar 78. The spring receiving plate 81 is provided on the outer peripheral side of the latch bar 78, for example. It is loosely fitted and its movement in the axial direction is restricted by the pin 80. The spring receiving plate 81 supports one end of the spring 82.

A spring 82 is provided between the link plate 18 and the spring receiving plate 81 as biasing means.
Is constituted by, for example, a compression spring, one end of which is in contact with the spring receiving plate 81 and the other end of which is in contact with the link plate 18, thereby constantly biasing the latch bar 78 toward the advanced position.

The bucket link device with hooks 70 according to the present embodiment has the above-described structure. When the hanging load hook 27 is stored in the hook storage space A of the bucket link 16 from the work position, the work is performed. Person is hanging load hook 2
7, the suspended load hook 27 is moved into the hook storage space A, and the hook 34 is gradually inserted into the guide space 77 of the hook guide 72.

At this time, the latch rod 78 holds the advanced position by the spring 82, and the hook engaging portion 78A and the pressed surface portion 78B protrude into the guide space 77.
By pressing the outer peripheral side of the latch rod 78 against the pressed surface portion 78B of the latch rod 78, the latch rod 78
2 to move from the advanced position to the retracted position. Then, when the outer peripheral side of the hook portion 34 gets over the hook engaging portion 78A of the latch bar 78, the latch bar 78 automatically returns to the advanced position by the spring force of the spring 82.

Thus, the hook portion 34 of the hanging load hook 27 is
Is hooked between the guide plates 75 and 76 of the hook guide 72, and the hook engaging portion 78A of the latch bar 78 at the advanced position engages with the inner peripheral side of the hook portion 34. 27 can be fixed between the guide plates 75 and 76, and can be quickly and easily stored in the storage position.

On the other hand, the hanging load hook 27 is
When the operator removes from the hook engaging portion 7 of the latch rod 78 by gripping the gripping tool 79 and moving the latch rod 78 from the advanced position to the retracted position against the spring 82.
8A is detached from the hook portion 34 of the hanging load hook 27. Thereby, the hanging load hook 27 can be detached from the hook guide 72, and can be quickly and easily taken out to the work position.

Next, FIG. 13 shows a bucket link device with hooks according to a fourth embodiment of the present invention. The feature of this embodiment is that the latch member extends between the hook guide and the latch member. In other words, a lock member for holding a locked position is provided. In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 90 denotes a bucket link device with a hook according to the present embodiment.
, A hook holding mechanism 35, and a lock member 91 described later.

Reference numeral 91 denotes a lock member provided between the hook guide 36 constituting the hook holding mechanism 35 and the latch plate 46. The lock member 91 is a lock pin 92 to be described later.
And a lock 93, which prohibits the latch plate 46 from moving to the retracted position and locks the latch plate 46 to the advanced position.

Reference numeral 92 denotes a lock pin which constitutes a lock member together with the lock 93. The lock pin 92 is formed in a cylindrical shape by, for example, a steel rod or the like, and has a stopper member (not shown) such as a flange at one end. ) Are formed integrally, and a radial hole 92A is formed at the other end. And the lock pin 92
Is inserted into each guide plate 40 (only one is shown) and the latch plate 46 in a state where the latch plate 46 is at the advanced position, thereby locking the latch plate 46 at the advanced position and moving the latch plate 46 to the retracted position. It is forbidden to move.

Reference numeral 93 denotes a lock attached to the other end of the lock pin 92. The chain 93A of the lock 93 is connected to the lock pin 92.
The lock pin 92 is locked in the axial direction by locking the lock 93 while being inserted into the radial hole 92A. Therefore, unless the lock of the lock 93 is released, the latch plate 46 is locked at the advanced position by the lock pin 92, and the suspended load hook 27 cannot be removed from the storage position.

The bucket link device 90 with a hook according to the present embodiment has the above-described configuration. For example, a construction machine rental company or the like can use the hanging load hook 27 as described above.
When a hydraulic excavator equipped with a lock member 9 is lent out under a contract not to use the hanging load hook 27,
By locking the latch plate 46 in the advance position in advance by 1 and keeping the hanging load hook 27 in a state where it cannot be removed from the storage position, the worker using the hydraulic shovel can use the hanging load hook 27 against the contract. Can be prevented.

In the bucket link device 15 with hooks according to the first embodiment described above, the worker can use the hook storage space A through the opening 20A formed in the closing plate 20.
By inserting a hand into the inside and holding the release lever 47, the latch plate 46 is rotated and displaced from the advanced position to the retracted position against the spring 48, and the load hook 27 is taken out.

However, the present invention is not limited to this. For example, as shown in a modification shown in FIG.
Alternatively, a latch plate 101 may be used. In this case, the latch plate 101 is rotatably provided between the guide plates 40 of the hook guide 36 via the support pins 45, and engages with the hook engaging portion 101A that engages with the hook portion 34 of the hanging load hook 27;
It is provided with a pressed portion 101B pressed by the hook portion 34 of the hanging load hook 27, and a rotating operation portion 101C extending toward the opening 20A side of the closing plate 20. Accordingly, while the operator holds the rotation operation unit 101C, the operator holds the latch plate 101 in FIG.
By rotating from the advanced position shown by the solid line in the middle to the retracted position shown by the two-dot chain line, the suspended load hook 27 can be easily taken out.

The bucket link device with hooks according to each of the above-described embodiments has two link plates 17 and 18.
An example is given in which a box-shaped bucket link 16 having a hook storage space A inside is used by the two closing plates 19 and 20.

However, the present invention is not limited to this. For example, a bucket link having a U-shaped cross section in which the inside is a hook storage space by two link plates and one closing plate may be used. Further, a bucket link formed of a hollow prism body formed by welding upper and lower flanges and left and right webs may be used.

The bucket link device with hooks 70 according to the third embodiment described above has a hook guide 72.
Although the case where the latch bar 78 is inserted through one of the guide plates 75 and 76 constituting the
The present invention is not limited to this. For example, a configuration in which the latch bar 78 is inserted into both of the guide plates 75 and 76 may be adopted.

[0105]

As described above in detail, according to the first aspect of the present invention, the hook holding means for holding the hook in the hook storage space of the bucket link is provided in the hook storage space along the moving direction of the hook. A hook guide that is extended and retractably provided on the hook guide, a latch member that holds the hook in the retracted position in the extended position and allows the hook to move to the working position in the retracted position, and a latch member in the extended position. The hook is configured to be constantly biased toward the hook, so that the hook can be reliably held at the storage position by the latch member biased to the advanced position by the biasing means. Further, the hook can be moved from the storage position to the working position only by moving the latch member to the retracted position against the urging means.

Therefore, the work of storing the hook in the hook storage space of the bucket link and the work of taking out the hook from the hook storage space to the work position can be performed quickly and easily, and can be performed even in a dark work site such as at night. The hook can be securely stored in the hook storage space.

According to the second aspect of the present invention, the hook guide is constituted by left and right guide portions which sandwich the hook from the left and right sides in the hook storage space, and the latch member is formed by the left and right guide portions. The hook is moved from the working position to the storage position, and the hook is fixed by the latch member while being sandwiched between the guides of the hook guide. The hook can be stably held in the hook storage space.

According to the third aspect of the present invention, the latch member is provided so as to be rotatable in a direction orthogonal to the moving direction of the hook by using the pin as the hook guide, and is constantly moved toward the advanced position by the urging means. Since the latch plate is urged to the advanced position by the urging means, the latch plate is engaged with the hook at the advanced position, so that the hook can be held at the storage position. it can. Further, the hook can be quickly and easily moved from the storage position to the working position only by rotating the latch plate to the retracted position against the urging means and detaching the latch plate from the hook.

According to the fourth aspect of the present invention, the latch member is provided on the hook guide so as to be displaceable in a direction orthogonal to the moving direction of the hook, and is constantly biased toward the advanced position by the biasing means. Since the latch is configured by the rod, the latch rod urged to the advanced position by the urging means engages with the hook at the advanced position, so that the hook can be held at the storage position. Further, the hook can be moved from the storage position to the work position only by displacing the latch bar to the retreat position against the urging means and detaching from the hook.

Further, according to the fifth aspect of the present invention, the lock member for holding the latch member locked in the advanced position is provided between the hook guide and the latch member. By locking the latch member at the extension position, the hook can be locked while being held at the storage position, thereby preventing the hook from being used carelessly.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic excavator including a bucket link device with hooks according to a first embodiment.

FIG. 2 is a longitudinal sectional view showing a bucket link device with a hook in FIG. 1;

FIG. 3 shows a bucket link device with hooks as indicated by an arrow in FIG. 2;
It is the bottom view seen from the III-III direction.

FIG. 4 is an enlarged sectional view showing a main part of a hanging load hook, a hook holding mechanism, and the like in FIG. 2;

FIG. 5 is an enlarged sectional view showing a main part of a hanging load hook, a hook holding mechanism, and the like from the opposite side to FIG. 4;

FIG. 6 is a cross-sectional view showing a state in which a latch plate of the hook holding mechanism is at an advanced position, as viewed from the direction of arrows VI-VI in FIG. 4;

FIG. 7 is a sectional view similar to FIG. 6, showing a state in which a latch plate of the hook holding mechanism moves to a retracted position.

FIG. 8 is an enlarged cross-sectional view of a principal part of a bucket link device with a hook according to a second embodiment, such as a hanging load hook and a hook holding mechanism, at the same position as in FIG. 4;

FIG. 9 is a cross-sectional view showing a state where the latch plate of the hook holding mechanism is at an advanced position, as viewed from the direction indicated by arrows IX-IX in FIG. 8;

FIG. 10 is a bottom view showing a bucket link device with hooks according to a third embodiment.

FIG. 11 is an enlarged cross-sectional view of a main part of a hanging load hook, a hook holding mechanism, and the like at a position similar to FIG. 4;

12 is a cross-sectional view of the hook holding mechanism in a state where the latch rod is at an advanced position, as viewed from the direction indicated by arrows XII-XII in FIG. 11;

FIG. 13 is a cross-sectional view of a lock member and the like used in the fourth embodiment at the same position as in FIG.

FIG. 14 is a cross-sectional view showing a modification of the first embodiment at the same position as in FIG. 6;

[Explanation of symbols]

7 Bucket 10 Bucket Cylinder 15, 50, 70, 90 Bucket Link Device with Hook 16 Bucket Link 22, 23 Cylinder-Side Boss (First Connection) 24, 25 Bucket-Side Boss (Second Connection) 27 Hanging Load Hook (Hook) 35, 51, 71 Hook holding mechanism 36, 52, 72 Hook guide 39, 40, 55, 56, 75, 76 Guide plate (guide portion) 46, 61, 101 Latch plate (latch member) 78 Latch rod ( Latch member) 48, 62, 82 Spring (biasing means) 91 Lock member A Hook storage space

 ──────────────────────────────────────────────────の Continuing on the front page (72) Kunihiko Yoshida, Hitachi Construction Machinery Business Frontier K.K. F-term in Tsuchiura factory (reference) 3F004 NA01 NA07 PC07 3F205 AA07 AA20 CA03 CA07 CA09 DA04 KA10

Claims (5)

[Claims] 1. A bucket link having a hook storage space formed therein by connecting a first connection portion on a bucket cylinder side and a second connection portion on a bucket side, and the second connection portion is swingable. A hook that is supported by the hook and moves between a storage position stored in the hook storage space and a work position separated from the hook storage space, and a hook holding unit that holds the hook in the storage position. In the attached bucket link device, the hook holding means is provided in the hook storage space and extends along the moving direction of the hook, and is provided so as to be able to advance and retreat to the hook guide. A latch member fixed to the hook guide and held in a storage position, and a latch member that allows the hook to move to a working position in a retracted position; Hooked bucket linkage, characterized in that constructed by biasing means for always urging towards. 2. The hook guide comprises left and right guide portions sandwiching the hook from both left and right sides in the hook storage space, and the latch member comprises one of the left and right guide portions. 2. The bucket link device with hooks according to claim 1, wherein the bucket link device is configured to be provided in the section so as to be able to advance and retreat. 3. The latch member is constituted by a latch plate provided so as to be rotatable in a direction perpendicular to the direction of movement of the hook by using a pin on the hook guide, and the latch plate is moved forward by the urging means. The bucket link device with a hook according to claim 1 or 2, wherein the bucket link device is configured to be constantly biased toward the hook. 4. The latch member comprises a latch bar provided on the hook guide so as to be displaceable in a direction orthogonal to the direction of movement of the hook, and the latch bar is always attached to the extended position by the urging means. The bucket link device with a hook according to claim 1 or 2, wherein the bucket link device is configured to be energized. 5. A structure in which a lock member is provided between the hook guide and the latch member for holding the latch member locked in the advanced position.
5. The bucket link device with a hook according to 3 or 4.