Hook storage structure

Abstract

To provide a hook storage structure capable of stably storing a hook allowing the hook lock to be easily operated while making the hook hardly unlocked.SOLUTION: A hook storage structure 100 for storing a hook 36 in a link device 30 of a construction machine 1 includes: a pair of links 30a and 30b arranged to face each other; a hook 36 attached to one end of the pair of links 30a and 30b rotatably; and a lock pin 40 that is inserted through one link 30a and regulates / regulation-releases pivotal movement of the hook 36. The lock pin 40 has a one-sided inclined portion 40a at the tip.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a hook storage structure for storing a hook in a link device such as a bucket link of a construction machine such as an excavator.

Background Art

[0002] Conventionally, a construction machine such as an excavator includes a working machine composed of a boom, an arm, a bucket, etc., and can perform excavation work with the bucket. In addition, the construction machine has a hook at the end of the bucket arm to which the bucket is attached in order to lift an object using the working machine.

[0003] For example, in a working machine with a hook disclosed in Patent Document 1, a hook for performing a lifting operation and a pair of hook storage members having pin holes are provided at the base end of a working attachment. The hook is rotatable between a hanging position where it hangs by its own weight around a horizontal hook support shaft and a storage position where it is stored between the hook storage members, and in the storage position, it is configured to be locked to a hook storage pin that is slidable in the insertion / removal direction with respect to the pin holes of the hook storage members and held in the storage position.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the technique disclosed in the above Patent Document 1, every time the hook is locked or unlocked, it is necessary to operate the hook storage pin that penetrates the pair of hook storage members, which is troublesome for the operator. Further, in a configuration where the hook storage pin penetrates the pair of hook storage members, it is necessary to make the shapes and arrangements of the pair of hook storage members precise, which may make the assembly difficult.

[0006] The present invention aims to provide a hook storage structure that allows for easy operation of the hook lock while making it difficult to unlock, and that provides stable storage for the hook. [Means for solving the problem]

[0007] To solve the above problems, the hook storage structure of the present invention comprises a pair of links arranged opposite each other, a hook rotatably attached to one end of the pair of links, and a locking pin inserted through one of the links to restrict or release the rotational movement of the hook, wherein the locking pin has a sloping portion on one side at its tip. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a hook storage structure that allows for easy operation of the hook lock while making it difficult to unlock, and that stably stores the hook. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view showing an example of a construction machine according to an embodiment of the present invention. [Figure 2] This is a plan view showing the state of the link device according to an embodiment of the present invention before the hook is retracted. [Figure 3] This is a plan view showing the hook in a retracted state in a link device according to an embodiment of the present invention. [Figure 4] This is a perspective view showing one of the links, a locking pin, and a mounting portion from the inside in a link device according to an embodiment of the present invention. [Figure 5] This is a perspective view showing one of the links, a locking pin, and a mounting portion from the outside in a link device according to an embodiment of the present invention. [Figure 6] This is a perspective view showing the other link and the erected portion from the inside in a link device according to an embodiment of the present invention. [Modes for carrying out the invention]

[0010] An embodiment of the present invention, a construction machine 1, will be described with reference to the figures. Figure 1 is a perspective view showing the construction machine 1 of this embodiment.

[0011] Construction machine 1 is used, for example, at construction sites, demolition sites, mines, etc., and performs civil engineering work, building work, etc., according to the operator's operation. In this embodiment, construction machine 1 is composed of a hydraulic excavator that performs earth and sand excavation work, etc. Construction machine 1 is configured as a work vehicle comprising a lower traveling body 2, an upper rotating body 3, and a work machine 4, with the upper rotating body 3 and work machine 4 rotatably mounted above the lower traveling body 2. The work machine 4 has the hook storage structure 100 of the present invention, and the details of the hook storage structure 100 will be described later.

[0012] The lower traveling body 2 comprises a pair of left and right crawlers 10 and a frame 11 that supports each crawler 10. The pair of crawlers 10 are driven by power received from the engine 12 of the upper slewing body 3 to enable the construction machine 1 to move. The frame 11 is provided between the pair of crawlers 10 and supports the upper slewing body 3 so that it can rotate.

[0013] The upper slewing body 3 is equipped with an engine 12 and a cabin 13. Inside the cabin 13 are a driver's seat for the operator, a display device for showing various information, and operating devices for the operator. The operating devices receive commands for the movement of the construction machine 1 and the rotation of the upper slewing body 3, as well as commands for the operation of the work equipment 4, for example, they receive commands for the rotation of the boom 20, arm 21, and bucket 22 of the work equipment 4.

[0014] The work machine 4 performs various tasks such as excavating soil according to the operator's controls. The work machine 4 is attached to the upper slewing body 3 and consists of a boom 20, an arm 21, and an excavation bucket 22. In the following description of the work machine 4, the side closer to the upper slewing body 3 is referred to as the base end, and the side further from the upper slewing body 3 (the side closer to the bucket 22) is referred to as the tip end.

[0015] The construction machine 1 drives the working machine 4 by hydraulic power of hydraulic oil, and includes boom cylinders 20a, arm cylinders 21a, and bucket cylinders 22a as hydraulic actuators for driving the boom 20, the arm 21, and the bucket 22, respectively. The construction machine 1 uses the power generated by the engine 12 to supply hydraulic oil from a hydraulic tank (not shown) to the boom cylinder 20a, the arm cylinder 21a, and the bucket cylinder 22a by a hydraulic pump (not shown), and drives the boom cylinder 20a, the arm cylinder 21a, and the bucket cylinder 22a using the hydraulic oil pressurized by the hydraulic pump as a power transmission medium.

[0016] The boom 20 is provided rotatably by a boom cylinder 20a that is hydraulically driven with respect to the machine body composed of the lower traveling body 2 and the upper swing body 3. For example, the boom 20 has a base end near the lower part of the upper swing body 3, extends with the base end as a fulcrum, and is configured to rotate up and down.

[0017] The arm 21 is attached to the tip of the boom 20 and is provided rotatably by an arm cylinder 21a that is hydraulically driven with respect to the boom 20. For example, the arm 21 has a base end near the tip of the boom 20, extends with the base end as a fulcrum, and is configured to rotate up and down or back and forth.

[0018] The bucket 22 is attached to the tip of the arm 21 and is provided rotatably by a bucket cylinder 22a that is hydraulically driven with respect to the arm 21. For example, the bucket 22 has a base end near the tip of the arm 21, extends with the base end as a fulcrum, and is configured to rotate up and down or back and forth.

[0019] Specifically, the tip of the arm 21 and the base end of a bucket bracket 27 provided on the outer surface of the base end of the bucket 22 are pivotally supported by a bucket shaft 28 having the left-right direction as the axial direction, whereby the bucket 22 is rotatable with respect to the arm 21. The bucket bracket 27 is composed of a pair of brackets 27a, and the tip of the arm 21 is interposed between the pair of brackets 27a.

[0020] Further, the tip of the bucket cylinder 22a and the tip of the bucket bracket 27 are connected via a link device 30. Here, the tip of the bucket cylinder 22a and the base end of the link device 30 are pivotally supported by a first link shaft 31 having the left - right direction as the axial direction, and the tip of the bucket bracket 27 and the tip of the link device 30 are pivotally supported by a second link shaft 32 having the left - right direction as the axial direction. Thereby, the link device 30 can rotate with respect to the bucket cylinder 22a and the bucket bracket 27 respectively. When the bucket cylinder 22a expands and contracts with respect to the arm 21, the bucket 22 rotates. The tip of the link device 30 is interposed between a pair of brackets 27a. Further, as shown in FIGS. 2 to 6, the link device 30 is composed of a pair of links 30a and 30b, and the tip of the bucket cylinder 22a is interposed between the pair of links 30a and 30b.

[0021] Furthermore, the tip side of the arm 21 and the base end of the link device 30 are connected via a pair of link support members 33. Here, the arm 21 and the base ends of the respective link support members 33 are pivotally supported by a third link shaft 34 having the left - right direction as the axial direction, and the base end of the link device 30 and the tips of the respective link support members 33 are pivotally supported by the first link shaft 31. Thereby, each link support member 33 can rotate with respect to the arm 21 and the link device 30 respectively. The tip side of the arm 21 is interposed between the base ends of the pair of link support members 33, and the base end of the link device 30 is interposed between the tips of the pair of link support members 33.

[0022] Next, the link device 30 will be described with reference to FIGS. 2 to 6. FIG. 2 shows a plan view of the link device 30 before storing the hook 36, and FIG. 3 shows a plan view of the link device 30 after storing the hook 36. FIG. 4 shows a perspective view from the inside of one link 30a, the lock pin 40, and the mounting portion 41, and FIG. 5 shows a perspective view from the outside of one link 30a, the lock pin 40, and the mounting portion 41. FIG. 6 shows a perspective view from the inside of the other link 30b and the standing portion 44.

[0023] The link device 30 is constructed by arranging a pair of elongated plate-shaped links 30a and 30b opposite each other. In the description of one link 30a, the side facing the other link 30b is considered the inside, and the opposite side is considered the outside. Similarly, in the description of the other link 30b, the side facing the other link 30a is considered the inside, and the opposite side is considered the outside.

[0024] The link device 30 is equipped with a hook 36 that is rotatable relative to the link device 30, and has a hook storage structure 100 for housing the hook 36. The hook 36 has a base portion 36a that is pivotally supported by the link device 30, and a curved key portion 36b for suspending an object, and the key portion 36b is attached to the base portion 36a via a swivel or the like and is rotatable relative to the base portion 36a.

[0025] A base end shaft hole 38 is formed at the base end of a pair of links 30a and 30b, into which a first link shaft 31 is inserted through in the left-right direction. A tip shaft hole 39 is formed at the tip of a pair of links 30a and 30b, into which a second link shaft 32 is inserted through in the left-right direction. The base portion 36a of a hook 36 is interposed between the tips of the pair of links 30a and 30b, and the second link shaft 32 passes through a hook shaft hole (not shown) in the base portion 36a, so that the hook 36 is pivotally supported by the second link shaft 32. As a result, the hook 36 is rotatable around the second link shaft 32, and rotates between a stowed position in which the key portion 36b is housed between the pair of links 30a and 30b, and a deployed position in which the key portion 36b is deployed from between the pair of links 30a and 30b. The hook 36 rotates in the vertical and horizontal directions, which intersect with the left-right direction, when the pair of links 30a and 30b are arranged in parallel in the left-right direction. One of the links 30a has a through hole 30c that penetrates in the left-right direction, positioned to correspond to the hollow portion of the hook 36 in its storage position.

[0026] The hook storage structure 100 includes a lock pin 40 that restricts the movement of the hook 36 stored in the link device 30, a mounting portion 41 for attaching the lock pin 40, a biasing member 42 that biases the lock pin 40, and a retaining portion 43 that prevents the lock pin 40 from coming out. In this embodiment, the lock pin 40 and the mounting portion 41 are attached to one of the pair of links 30a and 30b, specifically to link 30a. The hook storage structure 100 also includes an upright portion 44 that stabilizes the storage of the hook 36 in the link device 30. In this embodiment, the upright portion 44 is attached to the other of the pair of links 30a and 30b, specifically to link 30b.

[0027] The lock pin 40 moves in the left-right direction relative to the hook 36 housed between a pair of links 30a and 30b to restrict or release the movement of the hook 36, and is configured to be switchable between a locked position that restricts the movement of the hook 36 in the housed position and a released position that releases the movement of the hook 36. The lock pin 40 restricts the movement of the hook 36 by fitting into the hollow part of the housed hook 36. The lock pin 40 is configured so that its base end is inserted into the insertion hole 30c of one of the links 30a and its tip acts on the housed hook 36. The lock pin 40 is formed in a substantially cylindrical shape, with the tip of the lock pin 40 having a diameter that fits into the hollow part of the hook 36, and the base end of the lock pin 40 having a smaller diameter than the tip.

[0028] The tip of the lock pin 40 is provided with a sloping portion 40a that is inclined to one side. The sloping portion 40a is formed as a tapered surface that slopes from the deployment direction side of the hook 36 toward the storage direction side and toward the other link 30b side when the lock pin 40 is attached to one link 30a. The lock pin 40 is attached so that the sloping portion 40a faces the deployment direction side, while the storage direction side of the lock pin 40 becomes a restricting portion 40b that restricts the movement of the hook 36. The lock pin 40 is attached with its base end passing through one link 30a and protruding outward, and the outer protruding portion is provided with a through hole 40c that penetrates in a direction intersecting the left-right direction. A retaining portion 43 is attached by passing through the through hole 40c of the lock pin 40.

[0029] The mounting portion 41 has a fixing portion 45, a guide portion 46, and an engaging portion 47. The fixing portion 45 and the guide portion 46 are formed in a crank shape so that they are spaced apart from each other. The fixing portion 45 is fastened to the inner surface of one link 30a, and the guide portion 46 is positioned spaced apart from the inner surface of one link 30a. In particular, the guide portion 46 has a guide hole 46a that penetrates in the left-right direction, and the fixing portion 45 and the guide portion 46 are arranged so that the guide hole 46a corresponds to the insertion hole 30c of one link 30a. As a result, the lock pin 40 is inserted through both the insertion hole 30c and the guide hole 46a and can move in the left-right direction, in other words, the movement of the lock pin 40 is guided by the guide hole 46a of the guide portion 46.

[0030] The engaging portion 47 is fastened to the outer surface of one link 30a. The engaging portion 47 has a through hole 47a that penetrates in the left-right direction, and the engaging portion 47 is positioned so that the through hole 47a corresponds to the through hole 30c of one link 30a. A groove 47b is formed on the outer surface of the engaging portion 47 into which the retaining portion 43 engages. The components are adjusted so that the retaining portion 43, inserted into the through hole 40c of the lock pin 40, engages with the groove 47b of the engaging portion 47, with the inclined portion 40a of the lock pin 40 facing the deployment direction side of the hook 36 and the restricting portion 40b of the lock pin 40 facing the storage direction side of the hook 36.

[0031] The biasing member 42 is made of a coil spring and is positioned around the base end of the lock pin 40 between the tip of the lock pin 40 and one of the links 30a. The biasing member 42 biases the tip of the lock pin 40 toward the other link 30b relative to the link 30a.

[0032] The retaining portion 43 is made of a roll pin or the like and is installed by passing through the insertion hole 40c of the lock pin 40 as described above. The retaining portion 43 engages with the groove 47b (notch) of the engaging portion 47 on the outside of one link 30a, thereby preventing the lock pin 40 from coming off one link 30a.

[0033] The upright portion 44 is provided on the inner surface of the other link 30b and is erected toward the one link 30a. The upright portion 44 is formed, for example, as a flat plate perpendicular to the other link 30b, thereby preventing deformation due to impact when the hook 36 makes contact and maintaining durability. The upright portion 44 is positioned to correspond to the stored hook 36, and in particular, is positioned to be able to contact a part of the hook 36 locked by the lock pin 40 (for example, the part on the other link 30b side or the part on the storage direction side). The portion of the upright portion 44 facing the one link 30a is recessed toward the storage direction side of the hook 36 and has a stepped portion 44a, and a part of the stored hook 36 contacts the stepped portion 44a. The upright portion 44 stabilizes the storage of the hook 36 by contacting the stored hook 36.

[0034] Next, the storage operation of the hook 36 in the hook storage structure 100 will be described. First, when the hook 36 is rotated toward the unfolding direction relative to the lock pin 40 and unfolded, the lock pin 40 is normally biased toward the other link 30b by the biasing member 42, and the tip of the lock pin 40 protrudes toward the other link 30b relative to the guide portion 46.

[0035] When the operator retracts the hook 36, they rotate the hook 36 so that it faces the retraction direction and is positioned between the pair of links 30a and 30b, bringing it into contact with the tip of the lock pin 40. When the operator pushes the hook 36 in the retraction direction, the hook 36 presses against the inclined portion 40a on one side of the tip of the lock pin 40. At this time, the lock pin 40 is pushed against the biasing force of the biasing member 42 towards one of the links 30a, and the tip of the lock pin 40 enters the guide hole 46a of the guide portion 46, thereby allowing the hook 36 to move to the retraction position.

[0036] When the hook 36 is positioned in the storage position, the hollow portion of the hook 36 is positioned in correspondence with the lock pin 40, and the pressure on the lock pin 40 by the hook 36 is released. At this time, the lock pin 40 is again biased towards the other link 30b by the biasing member 42 and moves, and the tip of the lock pin 40 protrudes beyond the guide portion 46 towards the other link 30b and fits into the hollow portion of the hook 36. As a result, the hook 36 is locked by the lock pin 40, and the movement of the hook 36 is restricted from the storage direction by the restricting portion 40b at the tip of the lock pin 40. At this time, the hook 36 comes into contact with the upright portion 44, and the storage state is stably maintained.

[0037] Furthermore, by manually pulling the lock pin 40 toward one of the links 30a, the engagement between the tip of the lock pin 40 and the hollow portion of the hook 36 is released, and the lock on the hook 36 by the lock pin 40 is released. At this time, the worker can manually rotate the hook 36 in the deployment direction to deploy it.

[0038] As described above, according to this embodiment, the hook storage structure 100 for storing the hook 36 in the link device 30 of the construction machine 1 comprises a pair of opposing links 30a and 30b, a hook 36 rotatably attached to one end of the pair of links 30a and 30b, and a lock pin 40 inserted through one of the links 30a to restrict or release the rotational movement of the hook 36. The lock pin 40 has a sloping portion 40a on one side at its tip.

[0039] As a result, by utilizing the inclined portion 40a on one side of the locking pin 40, the locking operation of the hook 36 in a predetermined direction can be easily performed, while at the same time, it becomes difficult to unlock the hook 36 in the opposite direction to the predetermined direction, and the hook 36 can be stored stably.

[0040] Furthermore, according to this embodiment, one link 30a is provided with a mounting portion 41 through which a lock pin 40 is inserted, the lock pin 40 is provided with a retaining portion 43 at its base end, and the mounting portion 41 is provided with an engaging portion 47 that can engage with the retaining portion 43. As a result, by utilizing the engagement of the retaining portion 43, the direction of the inclination of the inclined portion 40a on one side of the lock pin 40 can be fixed, and the storage operation of the hook 36 can be performed stably.

[0041] Furthermore, according to this embodiment, the lock pin 40 is equipped with a biasing member 42 that biases the operation of the lock pin 40. As a result, the biasing member 42 stabilizes the position of the lock pin 40 and assists the locking operation of the lock pin 40, making the locking operation of the lock pin 40 easier.

[0042] Furthermore, according to this embodiment, the other link 30b is provided with an upright portion 44 that is erected toward the one link 30a. This allows the upright portion 44 to support the hook 36 locked to the lock pin 40, improving the vibration resistance of the hook 36 and stabilizing the storage of the hook 36 in the link device 30. In addition, since there is no need to provide a hole or the like in the other link 30b to support the lock pin 40, high-precision alignment of the pair of links 30a and 30b is not required, and assembly can be made easier.

[0043] Furthermore, according to this embodiment, the upright portion 44 is positioned so as to be able to contact a part of the hook 36 that is locked by the lock pin 40. As a result, the upright portion 44 does not support the entire hook 36, thus reducing the number of parts and making the upright portion 44 lighter.

[0044] Furthermore, according to this embodiment, the upright portion 44 has a stepped portion 44a. This allows the hook 36 to be supported from multiple directions by the stepped portion 44a, and prevents the hook 36 from coming out in the storage direction.

[0045] Furthermore, according to this embodiment, one link 30a is equipped with a guide portion 46 that guides the movement of the lock pin 40. As a result, compared to the case where the lock pin 40 is supported only by the insertion hole 30c of one link 30a, the lock pin 40 is supported by both the insertion hole 30c and the guide portion 46, thus preventing the lock pin 40 from wobbling. In addition, the lock pin 40 can be stably supported without making the thickness of one link 30a unnecessarily thick, which makes it possible to lighten the link device 30 and the hook storage structure 100. Furthermore, the swing of the hook 36 within the link device 30 can be suppressed. Note that by attaching the guide portion 46 to one link 30a, the hook 36 can be guided without providing any other mounting members.

[0046] In the embodiments described above, an example was given in which the lock pin 40 is formed in a cylindrical shape, but the present invention is not limited to this example. For example, in other examples, the base end of the lock pin 40 may be formed in a polygonal prism shape or an elliptical prism shape. In this case, the insertion hole 30c of one of the links 30a is formed in a polygonal or elliptical shape to match the base end of the lock pin 40. Alternatively, the base end of the lock pin 40 may be formed in a substantially cylindrical shape with a flat surface (corner) on its side. In this case, the insertion hole 30c of one of the links 30a is formed with a flat surface (corner) on a part of a circle to match the base end of the lock pin 40. As a result, the lock pin 40 is immobile relative to one of the links 30a, and the state in which the one-sided inclined portion 40a faces the unfolding direction side can be maintained.

[0047] Furthermore, the present invention may be modified as appropriate, provided that it does not contradict the gist or idea of ​​the invention as can be read from the claims and the specification as a whole. A hook storage structure for construction machinery that involves such modifications is also included in the technical concept of the present invention. [Explanation of Symbols]

[0048] 1. Construction machinery 4. Work equipment 22 buckets 30 Link device 30a, 30b links 36 hooks 40 lock pins 40a side slope 41 Mounting part 42. Biasing member 43 Retaining part 44 Elevated section 44a difference part 46 Guide section 47 Engagement part 100 hook storage structure

Claims

1. A hook storage structure, A pair of links arranged opposite to each other; a hook rotatably attached to one end of the pair of links; a lock pin that is inserted into one of the links and restricts or releases the restriction on the rotational movement of the hook; Equipped with A hook storage structure characterized in that the lock pin has a one-sided inclined portion at its tip.

2. one of the links includes an attachment portion through which the lock pin is inserted, The lock pin has a retaining portion at a base end, 2. The hook storage structure according to claim 1, wherein the attachment portion includes an engaging portion that can be engaged with the retaining portion.

3. 3. The hook storage structure according to claim 1, wherein the lock pin includes a biasing member for biasing the lock pin.

4. 4. The hook storage structure according to claim 1, wherein the other link has an upright portion that stands upright toward the one link.

5. 5. The hook storage structure according to claim 4, wherein the erected portion is disposed at a position where it can come into contact with a part of the hook locked by the lock pin.

6. 6. The hook storage structure according to claim 4, wherein the upright portion has a step portion.

7. 7. The hook storage structure according to claim 1, wherein one of the links includes a guide portion that guides the operation of the lock pin.

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