JP6973139B2 - Bucket link device with hook and construction machine equipped with it - Google Patents

Description

The present invention relates to a bucket link device with a hook capable of accommodating a hook device and a construction machine including the bucket link device.

Conventionally, a bucket link device with a hook having a bucket link body in which one end side is connected to the bucket cylinder by a first connecting pin and the other end side is connected to the bucket by a second connecting pin between the bucket cylinder and the bucket. Is known.

For example, the bucket link device with a hook of Patent Document 1 has a hook guide, an advance position for holding the hook in the storage position, and a retracted position for allowing the hook to move to the working position in the hook storage space of the bucket link. A hook holding mechanism including a latch plate that is rotationally displaced between the two and a spring that constantly urges the latch plate toward the advance position is provided. As a result, the latch plate urged by the spring engages with the hook and the hook can be held in the storage position simply by moving the hook into the hook storage space.

Further, in Patent Document 2, an elastic body for fixing the hook to the bucket link and a hook engaging portion for engaging with the hook portion are formed on the hook engaging portion. It is configured by using a cam body that holds and fixes the hook portion by pressing the engaged hook portion against the elastic body, and a latch that engages with the cam body that holds and fixes the hook portion.

Japanese Unexamined Patent Publication No. 2001-226878 Japanese Unexamined Patent Publication No. 2007-161357

However, in the bucket link device with a hook as in Patent Document 1, since the hook body is stored in a so-called vertical position substantially perpendicular to the bottom plate, the storage posture becomes high, and the hook body protrudes from the bucket link and is excavated. There is a problem that damage accidents are likely to occur due to collisions. In addition, although the latch plate has a retaining function, it does not suppress the rattling of the hook body, and it always rattles due to the impact during excavation, so that the latch plate and the hook body are gradually worn and damaged. There is a risk. Further, if the second connecting pin is removed at the time of bucket replacement, the center of the mounting hole of the hook body is displaced, so that there is a problem that it is difficult to insert the second connecting pin at the next mounting.

Further, the above-mentioned Patent Document 2 has a complicated structure in which a latch mechanism and a cam mechanism are combined, and also has two operation levers, which is troublesome to handle and may not be able to be stored and held even if it is slightly damaged or deformed. be.

The present invention has been made in view of this point, and an object of the present invention is to make a bucket link device with a hook difficult to break and have a simple structure.

In order to achieve the above object, in the present invention, the hook body can be held sideways in the storage position by the lock member and the urging member including the guide member and the camshaft.

Specifically, in the first invention, between the bucket cylinder and the bucket, one end side is connected to the bucket cylinder by the first connecting pin, and the other end side is connected to the bucket by the second connecting pin and attached. The target is a bucket link device with a hook that has a main body.

And the bucket link device with a hook is
A hook device having a base end portion swingably connected to the second connecting pin and a hook-shaped hook body connected to the base end portion, and a hook device.
A storage unit formed on the bucket link main body, in which the hook device is laterally stored along the bottom plate of the bucket link main body, and a storage portion in which the hook-shaped hook main body is stored sideways along the bottom plate of the bucket link main body.
The hook body is provided in the storage portion, and is provided with a holding portion for holding the hook body in the storage position where the hook body is stored sideways.
The holding part is
A guide member that fits into the hook body so that it can be stored in the storage position,
A lock member rotatably supported between a lock position that holds the hook body in the storage position and an open position that can be released from the lock position, and a lock member.
An urging member that urges the lock member to return to the lock position,
It is provided with a stopper portion that holds the lock member pushed by the urging member at the lock position.
The lock member is a camshaft that switches between an arc-shaped cross section that blocks the passage of the hook body and a concave cross section that allows passage at the portion where the bent and curved portion of the hook body abuts when rotated. It is configured.

According to the above configuration, the lock member is pushed by the urging member to the stopper portion and held in the locked position. When the hook body is stowed, the camshaft is rotated against the urging force of the urging member to reach the open position, and after passing through the concave cross section and stowed in the stowed position, the camshaft is attached. By returning to the locked position by the urging force of the force member, the hook body is prevented from coming off. Here, "the hook-shaped hook body is stored sideways along the bottom plate of the bucket link body" means that the hook body does not necessarily have to be arranged parallel to the bottom plate of the bucket link body, and is close to a right angle. If not, it means that it may be slightly inclined with respect to the bottom plate.

In the second invention, in the first invention,
The lock member further includes a lever portion that rotates the lock member against the urging member to switch from the lock position to the open position.

According to the above configuration, the lock member can be easily switched from the lock position to the open position by the lever portion.

In the third invention, in the second invention,
The lever portion is inclined toward the first connecting pin side at the lock position when viewed from the extending direction of the cam shaft, and is rotated from the first connecting pin side to the second connecting pin side. , The lock position is configured to be switched to the open position.

According to the above configuration, even if a rock or the like collides with the camshaft, the lever portion inclined toward the first connecting pin side at the locked position may be rotated to the second connecting pin side at the open position. Because it is low, it prevents unintentional unlocking.

In the fourth invention, in any one of the first to third inventions,
The guide member is provided with a notch into which the tip end side and the root side of the hook body are fitted.

According to the above configuration, the hook body is securely stored in place, and by specifying the width and depth of the outside of the notch with respect to the width and thickness of the hook body, the hook body is surely stored in the width direction and the depth direction. The rattling can be suppressed more reliably.

In the fifth invention, in the fourth invention,
The notch is composed of a first notch and a second notch into which the tip side and the root side of the hook body are fitted, respectively.
The guide member includes a protrusion that prevents the hook portion of the hook body from coming off between the first notch and the second notch.

According to the above configuration, the hook body is securely stored in the predetermined position, it is less likely to rattle, and the hook body is prevented from coming off by the projecting piece when the second connecting pin is pulled out when replacing the bucket. The position of the base end portion does not shift, and when the second connecting pin is inserted again, the alignment becomes extremely easy.

In the construction machine of the sixth invention, the bucket link device with a hook of any one of the first to fifth inventions is provided between the bucket cylinder and the bucket.

According to the above configuration, it is possible to obtain a highly commercially available construction machine equipped with a bucket link device with a hook that is not easily damaged and has a simple structure.

As described above, according to the present invention, the so-called sideways hook body is housed by using the camshaft urged at the lock position, so that the bucket link device with hook is not easily damaged and has a simple structure. Can be one.

FIG. 3 is a plan view showing a bucket link device with a hook in which the hook body is in the storage position. FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 2 is a sectional view taken along line III-III of FIG. It is a side view which shows the hydraulic excavator equipped with the bucket link device with a hook. It is a schematic perspective view which shows the part of the bucket link device with a hook in the middle of storing the hook body in an enlarged manner. It is a schematic perspective view which shows the part of the bucket link device with a hook in which a hook body is a storage position in an enlarged manner.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 4 shows a hydraulic excavator 1 as a construction machine provided with a bucket link device with a hook according to an embodiment of the present invention. The hydraulic excavator 1 includes, for example, a lower traveling body 2 such as a crawler, an upper swivel body 3 rotatably supported by the lower traveling body 2, an cab 4 provided in the upper swivel body 3, and an upper portion. The swivel body 3 is provided with a lower boom 5 undulatingly supported. The lower boom 5 is supported by the undulating cylinder 6 so as to be undulating, and the arm 7 is swayably supported by the arm cylinder 8 at the tip end. A bucket 9 is swingably supported by a bucket cylinder 10 at the tip of the arm 7 via an arm link 11 and a bucket link device 12 with hooks. The lower traveling body 2 may be a wheel.

Specifically, in the bucket link device 12 with a hook, one end side is connected to the bucket cylinder 10 by a first connecting pin 13 between the bucket cylinder 10 and the bucket 9, and the other end side is connected to the bucket 9 by a second connecting pin. 14 is connected and attached.

Then, as shown in FIG. 1, the bucket link device 12 with a hook includes a hook device 20, and the hook device 20 is swingably connected to a second connecting pin 14 at a base end portion 21 and a base end portion. It has a hook-shaped hook body 23 connected to 21. The hook main body 23 has a hook portion having a substantially circular or elliptical cross section, and the thickness thereof is thick on the root side 23b and thin on the tip side 23a bent in an arc shape. A retaining portion 24 urged in the closing direction is provided in the gap between the tip side 23a and the root side 23b through which the wire or the like is passed. The retaining portion 24 has, for example, a bent structure of a steel plate. The hook portion of the hook main body 23 can swing around the hook portion support pin 25 provided at the base end portion 21. Further, the hook portion of the hook main body 23 is rotatably supported with respect to the base end portion 21.

Further, the bucket link main body 12a made of a member excluding the hook device 20 is provided with a storage portion 12b in which the hook device 20 is housed. The storage portion 12b is provided in a space surrounded by a pair of side plates 12e and a bottom plate 12f between the first boss portion 12c and the second boss portion 12d in the bucket link main body 12a. A top plate is not provided on the side opposite to the bottom plate 12f, and an opening through which the hook body 23 enters and exits is formed. In addition, in order to make it easy to see, a member such as one side plate 12e is omitted in FIGS. 5 and 6.

The storage portion 12b is provided with a holding portion 30 that holds the hook main body 23 in a storage position for laterally storing the hook main body 23. Here, the storage position is defined as "horizontal", but the storage position is oriented along the bottom plate 12f of the bucket link main body 12a, and is not in a vertical position substantially perpendicular to the bottom plate 12f as in Patent Document 1 above. Means orientation. Specifically, as shown in FIG. 2, it does not have to be completely parallel to the bottom plate 12f and may be inclined, but the hook body 23 and the base end portion 21 protrude from the side plate 12e in a side view. Must be in a position that does not.

The holding portion 30 is provided with a guide member 31 that is fitted so that the hook main body 23 is stored in the sideways storage position. As shown in FIG. 6, the guide member 31 is made of, for example, a plate-shaped member, and includes a first notch 31a and a second notch 31b into which the tip side 23a and the root side 23b of the hook body 23 are fitted, respectively. There is. Here, either the tip side 23a or the root side 23b may be stored in the first notch 31a, or either the tip side 23a or the root side 23b may be stored in the second notch 31b. By fitting the hook main body 23 into the first notch 31a and the second notch 31b, the movement in the width direction W and the depth direction H is restricted, and rattling is suppressed. Since the projecting piece 31c is provided between the first notch 31a and the second notch 31b, the projecting piece 31c can be surrounded by the inner surface of the hook portion, so that the stability of the hook main body 23 is further increased.

Further, the holding portion 30 is located at a position separated from the guide member 31 with respect to the bottom plate 12f of the bucket link main body 12a, and has a lock position R (shown in FIGS. 1 and 6) for holding the hook main body 23 in the storage position. It includes a camshaft 32 that is rotatably supported between the open positions L (shown in FIG. 5) that can be released from the lock position R. The cam shaft 32 has a concave portion 32a recessed in a portion where the hook main body 23 abuts. By forming the concave portion 32a, the arcuate cross section 32b that blocks the passage of the hook main body 23 and the concave cross section 32c that allows the passage are switched depending on the rotation angle. The shape of the concave portion 32a may be formed by cutting, casting, or the like in accordance with the shape of the hook portion of the hook main body 23. For example, as shown in FIG. 2, the surface appears linear when viewed in cross section.

Further, the holding portion 30 includes an urging spring 34 as an urging member that urges the cam shaft 32 to return to the lock position R. As shown in FIG. 1, the urging spring 34 is made of, for example, a torsion coil spring, one end of which is fixed to the guide member 31, and the coil portion of the urging spring 34 holds the cam shaft 32 so as to urge the cam shaft 32 at the other end. It is fitted to a support pin 33 that supports rotation. The urging spring 34 may be composed of a leaf spring or the like. Further, the cam shaft 32 does not have to have the support structure of the support pin 33 as in the present embodiment, and may have a configuration in which the central shaft extending from the cam shaft 32 is supported by the side plate 12e.

Further, the holding portion 30 includes a stopper portion 35 that regulates the rotation range of the cam shaft 32. As shown in FIG. 1, for example, the stopper portion 35 is composed of a bolt member, and the cam shaft 32 is configured to come into contact with the protruding portion 32d in which the tip side protruding from the side plate 12e protrudes from the cam shaft 32 at a predetermined angle. ing. With this configuration, the camshaft 32 urged by the urging spring 34 does not rotate more than a predetermined angle.

As shown in FIGS. 1 and 2, the cam shaft 32 includes a lever portion 36 that rotates the cam shaft 32 against the urging spring 34 to switch from the lock position R to the open position L. The lever portion 36 has a length sufficient to rotate the cam shaft 32 against the urging force of the urging spring 34, but it is desirable that the lever portion 36 does not protrude from the side plate 12e in a side view.

Next, the work of putting in and taking out the hook body 23 will be described.

The hook body 23 is taken in and out in the working posture of the hydraulic excavator 1 as shown in FIG.

First, the hook body 23 is held by hand and the hook body 23 is stored while being rotated around the base end portion 21 side. Then, the hook portion of the hook main body 23 comes into contact with the concave portion 32a of the cam shaft 32. Here, even if the hook body 23 is pushed in by hand, the cam shaft 32 hardly rotates. Therefore, the lever portion 36 is operated to forcibly rotate the cam shaft 32. With this configuration, even if an unintended force is applied to the cam shaft 32, the cam shaft 32 does not unintentionally rotate.

After that, the cam shaft 32 returns to the lock position R by the urging force of the urging spring 34, so that the hook main body 23 is prevented from coming off at the storage position. In this storage position, the lever portion 36 does not protrude from the side plate 12e, so that it is difficult for rocks or the like to hit the lever portion 36 during the work of the hydraulic excavator 1, and even if the lever portion 36 hits, the lever portion 36 rotates in the L direction. Hateful. Therefore, even if a rock or the like collides with the lever portion 36 at the lock position R, it is hardly rotated in the direction of the open position L. Therefore, it is possible to prevent the lock from being unintentionally released, and by adjusting the gap C between the hook body 23 and the camshaft 32, the hook body 23 can be made less likely to rattle. can. Further, at the storage position, the hook main body 23 is fitted into the first notch 31a and the second notch 31b, so that the movement in the width direction W and the depth direction H is restricted, and rattling is suppressed. There is. Further, since the projecting piece 31c is provided between the first notch 31a and the second notch 31b, the projecting piece 31c can be surrounded by the inner surface of the hook portion, so that the stability of the hook main body 23 is further increased.

On the contrary, when taking out the hook main body 23, first, the lever portion 36 is manually operated to rotate the hook body 23 from the R position to the L position as shown in FIG. The protrusion 32d is rotated from the position of R that abuts on the stopper 35 to the position of L that abuts on the guide member 31. As a result, the camshaft 32 easily switches from the lock position R to the open position L. In that state, hold the hook body 23 by hand and pull it up. Therefore, the unlocking work is easy.

Further, in the posture of the shovel 1 shown in FIG. 4, when the bucket 9 is replaced, the hook main body 23 is prevented from coming off by the projecting piece 31c when the second connecting pin 14 is pulled out, so that the hook body 23 does not shift downward due to its own weight. However, when the second connecting pin 14 is inserted again, the alignment becomes extremely easy.

As described above, according to the present invention, since the sideways hook main body 23 is housed by using the cam shaft 32 urged to the lock position R, the bucket link device 12 with a hook is not easily damaged and is easy to use. Can have a similar structure. As a result, a highly commercially available hydraulic excavator 1 provided with a bucket link device 12 with a hook that is not easily damaged and has a simple structure can be obtained.

(Other embodiments)
The present invention may have the following configurations with respect to the above embodiment.

That is, although the example of the hydraulic excavator 1 is shown as a construction machine, a backhoe loader or the like having an attachment having a bucket link device 12 with a hook on the opposite side of the dozer may be used.

It should be noted that the above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications and uses.

1 Hydraulic excavator (construction machinery)
2 Lower running body
3 Upper swivel body
4 Driver's cab
5 Lower boom
6 undulating cylinder
7 arm
8 arm cylinder
9 buckets
10 bucket cylinder
11 Arm link
12 Bucket link device with hook
12a Bucket link body
12b storage unit
12c 1st boss part
12d 2nd boss part
12e side plate
12f bottom plate
13 1st connecting pin
14 Second connecting pin
20 hook device
21 base end
23 Hook body
23a Tip side
23b Root side
24 Retaining part
25 Hook support pin
30 Holding part
31 Guide member
31a 1st notch
31b 2nd notch
31c projectile
32 camshaft
32a concave part
32b arc-shaped cross section
32c concave cross section
32d protrusion
33 Support pin
34 Bounce spring (tension member)
35 Stopper
36 Lever part

Claims (6)

A bucket link device with a hook having a bucket link body, one end of which is connected to the bucket cylinder by a first connecting pin and the other end of the bucket is connected to the bucket by a second connecting pin. ,
A hook device having a base end portion swingably connected to the second connecting pin and a hook-shaped hook body connected to the base end portion, and a hook device.
A storage unit formed on the bucket link main body, in which the hook device is laterally stored along the bottom plate of the bucket link main body, and a storage portion in which the hook-shaped hook main body is stored sideways along the bottom plate of the bucket link main body.
The hook body is provided in the storage portion, and is provided with a holding portion for holding the hook body in the storage position where the hook body is stored sideways.
The holding part is
A guide member that fits into the hook body so that it can be stored in the storage position,
A lock member rotatably supported between a lock position that holds the hook body in the storage position and an open position that can be released from the lock position, and a lock member.
An urging member that urges the lock member to return to the lock position,
It is provided with a stopper portion that holds the lock member pushed by the urging member at the lock position.
The lock member is a camshaft that switches between an arc-shaped cross section that blocks the passage of the hook body and a concave cross section that allows passage at the portion where the bent and curved portion of the hook body abuts when rotated. A bucket link device with a hook, characterized by being configured. In the bucket link device with a hook according to claim 1,
The lock member is a bucket link device with a hook, further comprising a lever portion that rotates the lock member against the urging member to switch from the lock position to the open position. In the bucket link device with a hook according to claim 2.
The lever portion is inclined toward the first connecting pin side at the lock position when viewed from the extending direction of the cam shaft, and is rotated from the first connecting pin side to the second connecting pin side. , A bucket link device with a hook, which is configured to be switched from the lock position to the open position. In the bucket link device with a hook according to any one of claims 1 to 3.
The guide member is a bucket link device with a hook, characterized in that the guide member is provided with a notch into which the tip end side and the root side of the hook body are fitted, respectively. In the bucket link device with a hook according to claim 4,
The notch is composed of a first notch and a second notch into which the tip side and the root side of the hook body are fitted, respectively.
The guide member is a bucket link device with a hook, comprising a protrusion for preventing the hook portion of the hook body from coming off between the first notch and the second notch. A construction machine according to any one of claims 1 to 5, wherein the bucket link device with a hook is provided between the bucket cylinder and the bucket.

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