JP2019044447A - Bucket link device with hook and construction machine comprising the same - Google Patents

Abstract

To effectively prevent a lock operation part from being damaged or erroneously operated in a bucket link device with a hook.SOLUTION: A holding part 30 for holding a hook body 23 at a housed position is provided in a housing part 12b in which a hook device 20 is housed. At the holding part 30 are provided a first guide member 31 and a second guide member 32 for interposing the hook body 23 therebetween so that the hook body is housed at the housed position. There are provided: a lock member 35 that is supported swingably between a lock position at which the hook body 23 is held at the housed position and a released position at which the hook body can be released from the locked position to the first guide member 31; and an energization member for energizing the lock member 35 in a direction in which the hook body 23 is held at the housed position. The height of a lock operation part 35a from a base plate 12f of the housing part 12b at the time of the hook body 23 being held at the housed position is made to be larger than the height of any one of the first guide member 31 and a swing shaft support part 33 and be shorter than the height of the other.SELECTED DRAWING: Figure 1

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 same.

  2. Description of the Related Art Conventionally, a bucket with a hook has a bucket link body that is attached between a bucket cylinder and a bucket, one end of which is connected to the bucket cylinder by a first connecting pin and the other end is connected to the bucket by a second connecting pin. Link devices are known.

  For example, the bucket link device with a hook of Patent Document 1 is provided in a bucket link having a connecting portion rotatably connected to a second connecting pin, and a hook body attached to the connecting portion, and a bucket link. There is an opening for inserting and removing the hook device on one side, a storage space in which the hook device can be stored, and a storage space provided in the storage space, and a pair to guide the hook body from both the left and right sides when the hook device is inserted and removed A first guide member and a second guide member that are provided as a center, and a pivot shaft provided in the first guide member. The hook device is provided between the latch member for preventing the hook device from slipping out of the storage space, the first guide member, and the latch member. In the state which is stored in the latch member to protrude the hook body and a spring for urging in a direction to lock the hook body.

Japanese Patent Laid-Open No. 2006-104929

  However, in the conventional bucket link device with a hook, the operation portion for releasing the lock of the latch member protrudes outward from the plate material guide of the first guide member, and the work is performed while the hook device is stored. There is a risk of damaging the object being drilled. If the operation unit is damaged, unlocking becomes difficult.

  In addition, there is a problem in that an object hits the operation unit unintentionally during work and the lock is released. If the hook is unlocked unintentionally, the hook may hit an obstacle or a tip attachment and be damaged.

  The present invention has been made in view of such a point, and an object of the present invention is to effectively prevent the lock operation unit from being damaged or erroneously operated.

  In order to achieve the above object, the present invention has devised the arrangement position of the lock operation portion.

Specifically, in the first invention, one end side is connected to the bucket cylinder between the bucket cylinder and the bucket by the first connecting pin, and the other end side is connected to the bucket by the second connecting pin and attached. A bucket link device with a hook having a bucket link body,
A hook device having a base end portion that is swingably connected to the second connection pin and a hook body connected to the base end portion;
A storage portion formed in the bucket link body and storing the hook device;
A holding portion that is provided in the storage portion and holds the hook body in a storage position;
The holding part is
A first guide member and a second guide member that sandwich the hook body so as to be stored in the storage position;
A lock member supported so as to be swingable between a lock position for holding the hook body in the storage position and an open position that can be released from the lock position with respect to the first guide member;
A lock operating portion provided on the lock member and operated to release the lock member;
A biasing member that biases the lock member in a direction in which the hook body is held in the storage position;
A lock member swing shaft supported between the first guide member and a swing shaft support portion provided in the storage portion and rotatably supporting the lock member;
When the hook body is held at the storage position, the height of the lock operation portion from the bottom plate of the storage portion is higher and higher than the lower one of the first guide member and the swing shaft support portion. The configuration is lower than the above.

  According to the above configuration, when the hook body is held at the storage position, the lock operation portion held at the lock position by the urging member is protected by the higher one of the first guide member and the swing shaft support portion. Therefore, it is effectively prevented from being damaged or malfunctioning. On the other hand, since the height of the lock operation portion is higher than the lower height of the first guide member and the swing shaft support portion, the lock operation portion can be easily accessed from the lower member side, and the release operation is easy. Become.

According to a second invention, in the first invention,
The lock operation part has a protrusion that can be operated with a finger,
The protrusion protrudes from the lower side of the first guide member and the swing shaft support.

  According to said structure, since the lock operation part protrudes rather than the lower one of the 1st guide member and the rocking | fluctuation shaft support part, the operativity with a finger improves.

According to a third invention, in the first or second invention,
While the hook body is held with one hand, the lock operation part is operated with a finger to the side where the hook body is located, thereby releasing the lock.

  According to the above configuration, since the lock operation portion is swung to the side where the hook main body is located, the hook main body can be taken out as it is after the lock is released while holding the hook main body with one hand.

According to a fourth invention, in any one of the first to third inventions,
With respect to the side plate erected on the bottom plate of the bucket link main body, the protrusion of the lock operation portion is provided on the hook main body side with respect to the first guide member or the swing shaft support portion.

  According to the above configuration, the side plate side of the lock member is protected by the side plate. In addition, since the operation direction of the lock operation unit is the horizontal direction, the risk that an excavated material enters between the lock operation unit and the side plate and malfunctions are suppressed.

  In a construction machine according to a fifth aspect, the bucket link device with a hook according to any one of the first to fourth aspects is provided between a bucket cylinder and a bucket.

  According to said structure, the construction machine with high commerciality provided with the bucket link apparatus with a hook which has a lock operation part which is hard to be damaged and is hard to malfunction is obtained.

  As described above, according to the present invention, the height of the lock operation portion of the lock member is lower than the height of the first guide member that sandwiches the hook body, and is higher than the height of the swing shaft support portion that supports the lock member. Since the height is increased, the operability can be improved while effectively preventing the lock operation unit from being damaged or erroneously operated.

It is a perspective view which shows the bucket link apparatus with a hook in which a hook main body exists in a storage position. It is a perspective view which expands and shows a holding | maintenance part. It is a perspective view which expands and shows the storage part and hook apparatus in which a hook main body exists in a storage position. It is a front view which expands and shows the locking member seen from the 1st guide member side. It is a top view which expands and shows a mode that a locking member is cancelled | released with a thumb. It is a side view which shows the hydraulic excavator with which the bucket link apparatus with a hook was mounted | worn.

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

  FIG. 6 shows a hydraulic excavator 1 as a construction machine including a bucket link device with a hook according to an embodiment of the present invention. The excavator 1 includes, for example, a lower traveling body 2 such as a crawler, an upper revolving body 3 that is pivotally supported by the lower traveling body 2, a cab 4 provided in the upper revolving body 3, A lower boom 5 supported by the swivel body 3 so as to be raised and lowered is provided. The lower boom 5 is supported by a hoisting cylinder 6 so as to be able to move up and down, and an arm 7 is supported at the tip of the lower boom 5 so as to be swingable. A bucket 9 is supported at the tip of the arm 7 by a bucket cylinder 10 via an arm link 11 and a bucket link device 12 with a hook so as to be swingable. The lower traveling body 2 may be a wheel.

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

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

  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 stored. The storage portion 12b is provided in a space between the first boss portion 12c and the second boss portion 12d in the bucket link main body 12a and surrounded by the pair of side plates 12e and the bottom plate 12f. The 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. For ease of viewing, one side plate 12e is omitted in FIG.

  The storage portion 12b is provided with a holding portion 30 that holds the hook body 23 in the storage position. As shown in an enlarged view in FIG. 2, the holding portion 30 includes, for example, a plate-like base portion 30a. The base portion 30a can be fixed to the bottom plate 12f with a bolt 30b and accommodates the hook body 23. The first guide member 31 and the second guide member 32 sandwiched so as to be housed in the position are fixed by welding, for example.

  A lock member 35 is swingably supported on a lock member swing shaft 34 provided on the first guide member 31. Specifically, the lock member 35 is a rocker rocker supported between the first guide member 31 and the rocking shaft support portion 33 on the second connecting pin 14 pin side with respect to the first guide member 31. The shaft 34 is supported so as to be swingable. The lock member 35 is supported so as to be swingable between a lock position that holds the hook body 23 in the storage position and an open position that can be released from the lock position. The lock member swing shaft 34 is constituted by, for example, a rod bolt 34a fastened with a double nut 34b. The lock member swing shaft 34 may be configured by, for example, a pin other than the rod bolt 34a.

  As shown in FIGS. 3 and 4, the lock member 35 urges the lock member 35 in a direction in which the hook body 23 is held in the storage position, and a lock operation portion 35 a that releases the lock member 35 by operating the lock member 35. And an urging member 36. The lock member 35 has a pressing portion 35 b that comes into contact with the flange portion of the hook body 23. The lock operation part 35a has a protruding protrusion 35c that extends from the upper side of the lock member 35 and can be operated with a finger. The biasing member 36 is, for example, a torsion spring, but is not particularly limited. The lock member 35 may be formed by cutting a steel plate or may be formed of a casting. By this urging member 36, when the hook main body 23 passes through the pressing portion 35b and passes through and is stored in the storage position, the locking member 35 is urged so that the pressing portion 35b returns to the original position.

  A stopper pin 37 is also provided between the first guide member 31 and the swing shaft support portion 33. The stopper pin 37 is engaged with one end of the urging member 36, and is also a lock member. It plays the role of regulating the swing range of 35.

  As shown in FIG. 4, the vertical direction perpendicular to the plane formed by the center line of the first connecting pin 13 and the center line of the second connecting pin 14 when the hook body 23 is held in the storage position. The height of N from the bottom plate 12f of the storage portion 12b, here, for the sake of simplicity, the height H1 of the protrusion 35c of the lock operation portion 35a from the upper surface of the base portion 30a is the base portion of the first guide member 31. It is lower than the height H2 from the upper surface of 30a (H1 <H2). Further, the height H3 in the vertical direction N from the upper surface of the base portion 30a of the swing shaft support portion 33 is lower than the height H2 of the first guide member 31 (H3 <H2). That is, the height H1 of the protrusion 35c of the lock operation portion 35a is lower than the height H2 of the first guide member 31, and higher than the height H3 of the swing shaft support portion 33 (H3 <H1 <H2). ).

  Further, as shown in FIG. 4, the protrusion 35 c is provided on the side of the hook body 23 with respect to the side plate 12 e of the bucket link body 12 a by H from the first guide member 31 and the swing shaft support portion 33. In the present embodiment, the end surfaces of the first guide member 31 and the swing shaft support portion 33 are arranged at the same distance from the side plate 12e, but when either one is provided near the side plate 12e, the closer one is provided. It is sufficient that only H from the end face is provided on the back side when viewed from the side plate 12e. With this configuration, the side plate side of the lock member 35 is protected by the side plate 12e. Moreover, since the operation direction of the lock operation part 35a is a horizontal direction, the risk that an excavation thing will enter between the lock operation part 35a and the side plate 12e and malfunction will be suppressed.

  Next, procedures for storing and unlocking the hook device 20 in the bucket link device 12 with a hook according to the present embodiment will be described.

  First, as shown in FIGS. 1 and 3, when the hook main body 23 of the hook device 20 is stored in the storage portion 12b of the bucket link main body 12a, the lock operating portion 35a is protected by at least the first guide member 31. Therefore, it is effectively prevented from being damaged or malfunctioning.

  In order to unlock the hook body 23, as shown in FIG. 5, for example, the thumb T is applied to the lock operation portion 35a while holding the hook body 23 with four fingers from the index finger to the little finger, and the lock is released. . At this time, as shown in FIG. 4, the height H3 of the swing shaft support portion 33 is made lower than the height H2 of the first guide member 31 (H3 <H2). The thumb T or the like can easily access the lock operation portion 35a, and the hook body 23 can be lifted by releasing the lock with one hand, so that the release operation is extremely easy. When the hook body 23 is grasped with the reverse hand, the lock may be released by placing an index finger on the lock operation portion 35a.

  Therefore, according to the bucket link device 12 with a hook according to the present embodiment, it is possible to effectively prevent the lock operation unit 35a from being damaged or erroneously operated. Since the lock operation portion is not damaged, unlocking is not difficult. Further, since the hook is not unlocked unintentionally, there is no possibility that the hook hits an obstacle or a tip attachment and is damaged.

  Further, since the hydraulic excavator 1 is provided with the hooked bucket link device 12 between the bucket cylinder 10 and the bucket 9, the hooked bucket link device 12 having the lock operation portion 35 a that is not easily damaged and malfunctions. A hydraulic excavator 1 having high merchantability can be obtained.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  In other words, in the above-described embodiment, the swing shaft support portion 33 is disposed closer to the second connection pin 14 than the first guide member 31, but may be disposed closer to the first connection pin 13 than the first guide member 31. Good.

  Moreover, in the said embodiment, as shown in FIG. 4, height H1 of the projection part 35c of the lock operation part 35a is lower than height H2 of the 1st guide member 31, and height H3 of the rocking | fluctuation shaft support part 33 is shown. However, when the height H3 of the swing shaft support portion 33 is higher than the height H2 of the first guide member 31 (H3> H2), the swing shaft support portion 33 has a height H3 <H1 <H2. The height may be lower than the height H3 and higher than the height H2 of the first guide member 31 (H2 <H1 <H3).

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

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

1 Excavator (construction machine)
2 Lower traveling body
3 Upper swing body
4 cab
5 Lower boom
6 Rolling 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 section
12c 1st boss part
12d Second boss
12e side plate
12f Bottom plate
13 First connecting pin
14 Second connecting pin
20 Hook device
21 Base end
23 hook body
24 Retaining part
25 buttock support pin
30 Holding part
30a Base part
30b bolt
31 First guide member
32 Second guide member
33 Oscillating shaft support
34 Locking member swing shaft
34a Rod bolt
34b Double nut
35 Locking member
35a Lock operation part
35b Pressing part
35c protrusion
36 Biasing member
37 Stopper pin

Claims (5)

A bucket link device with a hook having a bucket link body having one end side connected to the bucket cylinder by a first connection pin between the bucket cylinder and the bucket and the other end side connected to the bucket by a second connection pin. There,
A hook device having a base end portion that is swingably connected to the second connection pin and a hook body connected to the base end portion;
A storage portion formed in the bucket link body and storing the hook device;
A holding portion that is provided in the storage portion and holds the hook body in a storage position;
The holding part is
A first guide member and a second guide member that sandwich the hook body so as to be stored in the storage position;
A lock member supported so as to be swingable between a lock position for holding the hook body in the storage position and an open position that can be released from the lock position with respect to the first guide member;
A lock operating portion provided on the lock member and operated to release the lock member;
A biasing member that biases the lock member in a direction in which the hook body is held in the storage position;
A lock member swing shaft supported between the first guide member and a swing shaft support portion provided in the storage portion and rotatably supporting the lock member;
When the hook body is held at the storage position, the height of the lock operation portion from the bottom plate of the storage portion is higher and higher than the lower one of the first guide member and the swing shaft support portion. The bucket link device with a hook characterized by being lower than this. In the bucket link device with a hook according to claim 1,
The lock operation part has a protrusion that can be operated with a finger,
The bucket link device with a hook, wherein the protrusion protrudes from the lower side of the first guide member and the swing shaft support portion. In the bucket link device with a hook according to claim 1 or 2,
A bucket link device with a hook, which is configured to release the lock by operating the lock operating portion with a finger toward the side where the hook main body is located while holding the hook main body with one hand. In the bucket link device with a hook according to any one of claims 1 to 3,
With respect to the side plate erected on the bottom plate of the bucket link main body, the protrusion of the lock operation portion is provided on the hook main body side with respect to the first guide member or the swing shaft support portion. Bucket link device with hook. A construction machine, wherein the bucket link device with a hook according to any one of claims 1 to 4 is provided between a bucket cylinder and a bucket.