Grapple device and hydraulic excavator

Abstract

To improve functionality by making it difficult for an abutting member of a locking body to come off from a stump without impairing the load-bearing capacity of the locking body.SOLUTION: The present invention comprises: a bracket 10 that can swing around a swing axis P at the tip of an arm 5 provided on a vehicle capable of travelling such as a hydraulic excavator S; a frame 12 provided on the bracket 10 so as to be rotatable around a rotation axis Q; a gripping member 20 provided on the frame 12 and capable of gripping a wood; a locking body 30 that can be locked to a stump R being provided on the vehicle side of the bracket 10, the locking body 30 being configured with a base member 31 and an abutting member 32 that is provided upright on it to protrude toward the vehicle side beyond a vehicle side edge E of the bracket 12 and can abut against the stump R, and the abutting member 32 being provided so that its protruding direction X is inclined in a direction away from the vehicle side edge E of the bracket 10 with respect to the rotation axis Q of the frame 12.SELECTED DRAWING: Figure 6

Description

【Technical Field】 【0001】 The present invention relates to a grapple device provided with a pair of gripping members capable of gripping wood at the tip of an arm provided on a vehicle such as a hydraulic excavator, and particularly to a grapple device having a function capable of efficiently removing a stump remaining on the ground after a standing tree is felled, and a hydraulic excavator equipped with the same. 【Background Art】 【0002】 Conventionally, as this type of grapple device, for example, the one described in Patent Document 1 (Japanese Patent No. 5469982) proposed by the applicant of the present application is known. As shown in FIGS. 9 and 10, this grapple device Ga is attached to the tip of an arm 100 swingably provided on a hydraulic excavator Sa as a vehicle. It includes a bracket 102 swingably supported about a swing shaft 101 at the tip of the arm 100, a frame 104 rotatably provided about a rotation axis Pa with respect to the bracket 102 via a rotation mechanism 103, a pair of gripping members 105 provided on the frame 104 so as to be openable and closable and capable of gripping wood, a hydraulic motor (not shown) provided inside the bracket 102 for rotationally driving the frame 104, and a hydraulic cylinder device (not shown) provided on the frame 104 for opening and closing the pair of gripping members 105. 【0003】 On the vehicle side of the bracket 102, a locking body 110 capable of locking to a stump R remaining on the ground after a standing tree is felled is provided. The locking body 110 includes a base member 111 fixed to the bracket 102, and a plate-shaped contact member 112 having a saw blade-shaped end face that protrudes to the vehicle side beyond the vehicle-side edge 107 of the bracket 102 and is erected so as to be able to contact the stump R. The protruding direction Xa (plane direction) of the plate-shaped contact member is parallel to the rotation axis Pa of the frame 104. 【0004】 [[ID=I9]] As a result, when performing the task of pulling out a tree stump R ("stump removal") using a hydraulic excavator Sa equipped with this grapple device Ga, the gripping member 105 is closed, and the bracket 102 is swung around the pivot axis 101 to lift the grapple device Ga to the front of the arm 100, positioning the locking body 110 of the bracket 102 downwards. Then, the arm 100 is moved, and the hydraulic excavator Sa is moved, to engage the contact member 112 of the locking body 110 with the tree stump R remaining on the ground and to swing it, mainly to engage the contact portion 112 of the locking body 110 with the outer circumference of the tree stump R on the side furthest from the vehicle, and to pull it towards the vehicle to lift and remove the tree stump R. [Prior art documents] [Patent Documents] 【0005】 [Patent Document 1] Patent No. 5469982 [Overview of the Initiative] [Problems that the invention aims to solve] 【0006】 Incidentally, in this conventional grapple device Ga, as shown in Figure 10, when the contact member 112 of the locking body 110 is locked to the tree stump R, the contact member 112 can easily come off the tree stump R, and there has been a desire for improvement. The reason for this is that in order to ensure that the contact member 112 of the locking body 110 is locked, the end face of the contact member 112 is made to contact the outer surface of the tree stump R so that the protruding direction Xa of the contact member 112 is perpendicular to the outer surface of the tree stump R. However, since the contact member 112 of the locking body 110 is provided with its protruding direction Xa parallel to the rotation axis Pa of the frame 104, the gap (so-called throat) between the end face of the contact member 112 and the vehicle-side end edge 107 of the bracket 102 is relatively small, and therefore the cut surface of the tree stump R The vehicle-side edge 107 of the bracket 102 is more likely to come into contact with the stump R, and the position where the end face of the lower contact member 112 comes into contact with the cut surface of the stump R becomes shallower. In other words, the dimension h from the cut surface of the stump R to the position where the end face of the contact member 112 comes into contact becomes smaller, and when a load is applied to the locking body 110, the corner portion Ra on the cut surface side of the stump R may chip off, causing the locking body 110 to come off. Furthermore, even if it is reattached, it may be difficult to lock the locking body 110 into the chipped portion, and it may come off again. 【0007】 Furthermore, as shown in Figure 9, if the end face of the contact member 112 is brought into contact with the outer surface of the stump R so that the protruding direction Xa of the contact member 112 is perpendicular to the outer surface of the stump R, the arm 100 will be extended and the bracket 102 will also be extended outward. As a result, the distance La from the vehicle to the contact member 112 will be large, making it difficult to process the stump R near the vehicle. Processing will be limited to stump R that are a certain distance away from the vehicle, and the vehicle may become unstable. 【0008】 On the other hand, if the oscillation of the bracket 102 is reduced and the dimension h from the cut surface of the stump R to the position where the end face of the lower contact member 112 contacts is increased as much as possible, the contact member 112 will hit the outer surface of the stump R at an angle, so a moment load will act on the contact member 112, resulting in insufficient force transmission. In addition, the locking of the end face of the contact member 112 will also be insufficient, leading to the problem that it is likely to slip and come off. 【0009】 To solve this, one could consider lengthening the base member 111 of the locking body 110 so that it protrudes, but this would increase the moment load acting on the base member 111, leading to a problem of reduced load-bearing capacity. 【0010】 This invention has been made in view of the above-mentioned problems, and aims to provide a grapple device and a hydraulic excavator that improve functionality by making it difficult for the contact member of the locking body to come loose from the stump without impairing the load-bearing capacity of the locking body. [Means for solving the problem] 【0011】 To achieve this objective, the present invention provides a grapple device comprising: a bracket supported at the tip of an arm provided on a drivable vehicle so as to be able to swing around a pivot axis; a frame provided on the bracket so as to be able to rotate around a pivot axis via a rotation mechanism; and a gripping member provided on the frame so as to be able to open and close and capable of gripping wood. A grapple device is provided on the vehicle side of the bracket, on the frame side, which is capable of engaging with a tree stump remaining on the ground after a tree has been felled, and the engaging body comprises a base member fixed to the bracket and a contact member erected on the base member so as to protrude toward the vehicle side beyond the vehicle-side edge of the bracket and having an end face capable of contacting the tree stump, The above-mentioned contact member is configured such that, when viewed from the side, the protruding direction of the contact member is inclined in a direction that moves away from the vehicle-side edge of the bracket with respect to the rotation axis of the frame. 【0012】 The locking body can be made of metal such as iron, the same material as the bracket, and can be additionally attached to the bracket by welding or bolting. Therefore, it is easy to manufacture and cost-effective. The shape of the base member and contact member of the locking body may be formed as appropriate. The end face of the contact member may also be formed as appropriate. For example, if the contact member is formed in the shape of a plate, its end face may be concave and shaped like a saw blade. Alternatively, the end face may be sharpened to form a blade shape, and then the blade shape may be shaped like a saw blade, etc., and these can be modified as appropriate. If the end face of the plate is concave, it becomes easier to bring the end face into contact with the outer curved surface of the stump, so that the localized load on the stump can be distributed and the full force can be transmitted without partially destroying it, thereby improving the efficiency of stump extraction. Furthermore, if the end face of the contact member is formed in a sawtooth shape, the sawtooth portion will bite into the stump, ensuring secure locking. This makes it easier to transmit force to the stump, thereby improving the efficiency of stump extraction. 【0013】 As a result, vehicles equipped with this grapple device can be used, for example, in forests, to swing and rotate the arm and open and close the gripping member of the grapple device to perform various tasks such as collecting felled timber, aligning the end grain, stacking, loading, unloading, and processing branches. In forests, when collecting felled timber, a road is formed to facilitate the movement of logging vehicles and hydraulic excavators. However, stumps left on the ground after felling trees can get in the way, so a stump removal operation is performed to level the road, and the removed stumps can be used to reinforce the roadside or other areas. 【0014】 During the stump extraction operation, with the gripping member closed, the bracket is swung around the pivot axis to lift the grapple device to the front of the arm, positioning the bracket's locking body downwards. Then, the arm is moved and the vehicle is moved to engage the contact member of the locking body with the outer surface of the stump remaining on the ground and to shake it. Primarily, the contact member of the locking body is engaged with the side of the stump furthest from the vehicle, and the stump is pulled towards the vehicle to be lifted and extracted. 【0015】 In this case, in order to ensure that the contact member of the locking body is securely locked, the end face of the contact member is positioned to contact the outer surface of the stump so that its protruding direction is perpendicular to the outer surface of the stump. However, when viewed from the side, the contact member of the locking body is positioned so that its protruding direction is inclined away from the vehicle-side edge of the bracket with respect to the frame's rotation axis. As a result, the distance between the end face of the contact member and the vehicle-side edge of the bracket (the so-called "throat") is larger than in conventional designs. Therefore, the vehicle-side edge of the bracket is less likely to contact the cut surface of the stump. Consequently, the distance from the cut surface of the stump to the point where the lower end face of the contact member contacts can be made larger. This prevents the cut surface of the stump from chipping when the bracket is pulled towards the vehicle to lift the stump, making it less likely for the locking member of the locking body to come loose from the stump, thus improving functionality. 【0016】 Furthermore, the contact member of the locking body is positioned such that, when viewed from the side, its protruding direction is inclined away from the vehicle-side edge of the bracket with respect to the frame's rotation axis. Therefore, when bringing its end face into contact with the outer surface of the stump so that its protruding direction is perpendicular to the outer surface of the stump, the distance that the arm and bracket need to extend outward can be reduced compared to conventional methods. As a result, it becomes easier to process stumps near the vehicle, and the vehicle can be stabilized while processing the stumps. 【0017】 Furthermore, in this case, since the contact member of the locking body is inclined, there is no need to make the base member protrude for a long length, thus making it strong against load and not compromising the load-bearing capacity of the locking body. In addition, since the locking body is attached to the bracket, the force against the stump acts from the bracket towards the arm side, and does not act on the frame or its rotation mechanism, thus preventing damage to the rotation mechanism by not putting a load on it. 【0018】 Then, once the stump has been removed, the grapple device is moved to grasp the stump with the gripping member and transport it to the appropriate location. In this case, the grapple device can immediately perform its intended function after the stump has been removed, resulting in significantly better work efficiency and reduced costs compared to using a dedicated machine or changing attachments. 【0019】 Furthermore, if necessary, the configuration is such that the angle of the protruding direction of the contact member with respect to the rotation axis of the frame is θ, where θ is 5° ≤ θ ≤ 60°. This ensures that the function and effects of the present invention are reliably achieved. If the angle is less than 5°, it is difficult to secure sufficient space (so-called "throat") between the end face of the contact member and the vehicle-side edge of the bracket. If the angle is greater than 60°, the swing angle of the bracket becomes shallower, which is undesirable as the gripping member is more likely to come into contact with the ground. Preferably, the angle is 15°≦θ≦45°. 【0020】 Furthermore, if necessary, the bracket may be configured to include a base plate on which the frame's rotation mechanism is provided, a pair of side plates provided on both sides of the base plate on which the pivot shaft is provided, and a cover plate provided in the center between the side plates to cover the rotation mechanism, with a base plate mounted between the side plates above the base plate, and the base member of the locking body detachably attached to the base plate. 【0021】 Thus, since the base member is attached to the substrate, compared to the case where the base member is provided directly on the bracket, it becomes stronger against loads and the load-bearing capacity can be improved. Also, since the locking body is detachable, the locking body wears out during use. In that case, the locking body can be removed and a new locking body can be attached and replaced for use. Also, it can be replaced with a modified shape of the contact member, increasing versatility. 【0022】 In this configuration, the base member is formed in a plate shape that is attached to the surface of the substrate by surface contact, the contact member is formed in a plate shape having a surface along a direction parallel to the swing axis of the bracket, the contact member is welded and fixed above the base member such that the surfaces of the base member and the contact member are perpendicular to each other, the substrate is formed in a rectangular shape having an upper edge, a lower edge, and a pair of side edges, and the upper edge is welded and fixed to a cover plate, the lower edge is welded and fixed to a base plate, and the both side edges are welded and fixed to corresponding side plates so that the protruding direction of the contact member of the locking body attached to the substrate becomes the angle θ. 【0023】 As a result, since the contact member is welded and fixed to the base member so as to be perpendicular to each other, the load acting in the protruding direction of the contact member can be reliably received by the base member, and the load can also be received by the substrate with which the base member makes surface contact. Thus, it becomes even stronger against loads and the load-bearing capacity can be improved. Moreover, since the four sides of the substrate are welded and fixed to the corresponding cover plate, base plate, and pair of side plates, respectively, the support strength against the bracket is extremely high, and the load-bearing capacity can also be improved in this regard. 【0024】 Also, in this configuration, a plurality of insertion holes through which bolts are inserted are provided in the substrate and the base member of the locking body, and the locking body is attached to the substrate by inserting bolts through the respective insertion holes and screwing nuts. It is effective to form an elongated hole on the platen facing the substrate for the screwing operation of the bolt and the nut. As a result, the locking body can be attached and detached by bolts and nuts, so that the attachment and detachment operation is easy and the workability can be improved. Further, since an elongated hole for the screwing operation of the bolt and the nut is formed in the platen, the attachment and detachment operation is also easy at this point, and the workability can be improved. 【0025】 And the present invention resides in a hydraulic excavator equipped with the above-described grapple device. According to this hydraulic excavator, the same operations and effects as described above are achieved. 【Effects of the Invention】 【0026】 According to the present invention, when the contact member of the locking body is locked to the outer peripheral surface of the stump and rocked and pulled out, the locking of the contact member of the locking body to the stump can be made difficult to release without impairing the load-bearing capacity of the locking body, and the functionality can be improved. 【Brief Description of the Drawings】 【0027】 [Figure 1] The figure which shows the grapple device which concerns on embodiment of this invention and the hydraulic excavator which mounted the same with the state at the time of performing the stump extraction work. [Figure 2] The perspective view which shows the grapple device which concerns on embodiment of this invention. [Figure 3] The exploded perspective view which shows the grapple device which concerns on embodiment of this invention. [Figure 4] The figure which shows the bracket of the grapple device which concerns on embodiment of this invention, (a) is a plan view, (b) is a bottom view, (c) is a rear view. [Figure 5] The sectional view taken along line A-A in FIG. 4(a) which shows the bracket of the grapple device which concerns on embodiment of this invention. [Figure 6]This figure shows the state when a tree stump is being pulled out using a grapple device according to an embodiment of the present invention. [Figure 7] This figure shows a grapple device according to another embodiment of the present invention in a state when performing stump extraction work. [Figure 8] This is a partial cross-sectional view showing another example of a locking body in a grapple device according to an embodiment of the present invention. [Figure 9] This diagram shows a conventional grapple device and a hydraulic excavator equipped with it, along with their configurations when performing tree stump removal work. [Figure 10] This diagram shows the state of tree stump extraction using a conventional grapple device. [Modes for carrying out the invention] 【0028】 Hereinafter, a grapple device according to an embodiment of the present invention and a hydraulic excavator as a vehicle on which it is mounted will be described in detail based on the attached drawings. As shown in Figures 1 to 6, the hydraulic excavator S (Figure 1), which is a vehicle according to an embodiment of the present invention on which the grapple device G according to an embodiment of the present invention is mounted, comprises a vehicle body 1 equipped with a crawler-type running body 2, a slewing body 4 rotatably attached to the vehicle body 1 via a slewing mechanism 3, and an arm 5 attached to the slewing body 4 so as to be able to swing up and down. The arm 5 consists of a boom 5a that is provided on the slewing body 4 so as to be able to swing up and down and is driven to swing by a hydraulic cylinder, and a working arm 5b that is provided at the tip of the boom 5a so as to be able to swing up and down and is driven to swing by a hydraulic cylinder. The grapple device G is mounted at the tip of the working arm 5b of the arm 5. 【0029】 The grapple device G according to this embodiment includes a metal bracket 10 made of iron or the like, which is pivotably attached to the tip of the arm 5 around a pivot axis P and is pivotally driven by a hydraulic cylinder device 8 via a link mechanism 7, and a metal frame 12 made of iron or the like, which is rotatably mounted on the bracket 10 around a rotation axis Q perpendicular to the pivot axis P via a rotation mechanism 11. The bracket 10 is provided with a hydraulic motor (not shown) that rotates the frame 12 via the rotation mechanism 11. The bracket 10 is configured to include a base plate 14 on which the rotation mechanism 11 of the frame 12 is provided on the lower side and the hydraulic motor is provided on the upper side and has a surface perpendicular to the rotation axis Q, a pair of side plates 15 provided on both sides of the base plate 14 and on which the pivot axis P is provided, and a cover plate 16 provided in the center between the side plates 15 and covering the hydraulic motor of the rotation mechanism 11. 【0030】 Furthermore, the frame 12 is equipped with a pair of metal gripping members 20(A)(B), such as iron, that are rotatably mounted and capable of gripping wood. As shown in Figure 2, one gripping member 20(A) is formed in a bucket shape and fixed to the frame 12. The other gripping member (B) is rotatably mounted on the frame 12 and is opened and closed relative to the gripping member 20(A) by a hydraulic cylinder device (not shown). The gripping member 20(B) comprises a pair of tongs 22 spaced at a predetermined interval and a support rod 23 stretched between the tips of the tongs 22. When the gripping member 20 is open, it opens the lower side of the frame 12, and when each gripping member 20 is closed, it positions the tongs 22 inside the other gripping member 20(A). 【0031】 In this grapple device G, a locking body 30 is provided on the bracket 10 on the hydraulic excavator S side and the frame 12 side, which can engage with the tree stump R remaining on the ground after felling a standing tree. This locking body 30 is made of metal such as iron, the same material as the bracket 10, and comprises a base member 31 fixed to the bracket 10, and a contact member 32 erected on the base member 31, protruding further towards the vehicle than the vehicle-side edge E of the side plate 15 of the bracket 10, and having an end face 33 that can contact the tree stump R. 【0032】 In the locking body 30, the base member 31 is formed in the shape of a rectangular plate that is attached to the surface of the substrate 40 (described later) by surface contact, and the abutment member 32 is formed in the shape of a plate with a surface that is aligned in a direction parallel to the pivot axis P of the bracket 10. The abutment member 32 is welded to one upper edge of the base member 31 so that the surface of the base member 31 and the surface of the abutment member 32 are perpendicular to each other. The end face 33 of the abutment member 32 has a surface perpendicular to the surface of the abutment member 32, is concave, and is shaped like a sawtooth. 【0033】 Furthermore, the contact member 32 is positioned such that, when viewed from the side (Figure 5), its protruding direction X (surface direction) is inclined in a direction away from the vehicle-side edge E of the bracket 10 with respect to the rotation axis Q of the frame 12. When the angle of the protruding direction X of the contact member 32 with respect to the rotation axis Q of the frame 12 is θ, the angle is set to 5° ≤ θ ≤ 60°. If the angle is less than 5°, it is difficult to secure sufficient space (so-called "throat") between the end face 33 of the contact member 32 and the vehicle-side edge E of the bracket 10. If the angle is greater than 60°, the swing angle of the bracket 10 becomes shallower, but this makes it easier for the gripping member 20 to come into contact with the ground, which is undesirable. Preferably, the angle is 15° ≤ θ ≤ 45°. In this embodiment, θ is set to 20°. The angle θ is not limited to this setting. 【0034】 More specifically, a base plate 40 is installed between the side plates 15 above the base plate 14, and the base member 31 of the locking body 30 is detachably attached to this base plate 40. The base plate 40 is formed in a rectangular shape with an upper edge, a lower edge, and a pair of side edges, and is positioned at an inclination with respect to the base plate 14 such that the protruding direction X of the contact member 32 of the locking body 30 attached to the base plate 40 is the angle θ described above, with the upper edge welded to the cover plate 16, the lower edge welded to the base plate 14, and both side edges welded to the corresponding side plates 15. 【0035】 Furthermore, as shown in Figure 3, the base member 31 of the substrate 40 and the locking body 30 is provided with a plurality (four in this embodiment) of through holes 41, 42 through which bolts 43 are inserted at predetermined intervals. The locking body 30 is attached to the substrate 40 by inserting the bolts 43 through each of the through holes 41, 42 and screwing on the nuts 44. 46 is a washer. One side edge of the base member 31 is attached to the substrate 40 so as to slightly protrude from the lower edge of the substrate 40, and the welded base end of the contact member 32 is provided so as to slightly protrude from the lower edge of the substrate 40. Also, as shown in Figure 4(b), the base plate 14 facing the substrate 40 has a pair of elongated holes 45 for screwing in the bolts 43 and nuts 44. In other words, the base member 31 of the locking body 30 is detachably attached to the bracket 10 via the substrate 40 by four sets of bolts 43 and nuts 44. When the locking body 30 is attached to the substrate 40, the contact member 32 of the locking body 30 protrudes from the lower edge of the substrate 40. 【0036】 Therefore, the hydraulic excavator S equipped with this grapple device G is used, for example, in forests, and by swinging and rotating the arm 5 and opening and closing the gripping member 20 of the grapple device G using a hydraulic cylinder device, it performs various operations such as collecting felled timber, aligning the end grain, stacking, loading, unloading, and processing branches. In addition, in forests, when collecting felled timber, a road is formed to facilitate the movement of the hydraulic excavator S, but at that time, the stumps R that remain on the ground after felling the trees may get in the way, so the work of pulling out the stumps ("stump removal work") is performed to level the road, and the pulled-out stumps R are used to reinforce the road shoulder or other areas. 【0037】 During the stump extraction operation, for example, as shown in Figure 6, with the gripping member 20 closed, the bracket 10 is swung around the pivot axis P to lift the grapple device G to the front of the arm 5, and the locking body 30 protruding from the vehicle side of the bracket 10 is positioned downwards. Then, the arm 5 is moved and the hydraulic excavator S is moved to lock the end face 33 of the contact member 32 of the locking body 30 to the side of the stump R remaining on the ground that is farther from the vehicle. Then, the stump R is pulled towards the hydraulic excavator S, causing it to shake and lift up for extraction. Note that the rotation position of the frame 12 is not limited to the position shown in Figure 6, and the stump R can be extracted at any rotation position. 【0038】 In this case, as shown in Figure 6, in order to ensure that the contact member 32 of the locking body 30 is locked, the end face 33 of the contact member 32 is brought into contact with the outer surface of the stump R so that the protruding direction X of the contact member 32 is perpendicular to the outer surface of the stump R. However, the contact member 32 of the locking body 30 is provided such that, when viewed from the side, the protruding direction X of the contact member 32 is inclined in a direction away from the vehicle-side edge E of the bracket 10 with respect to the rotation axis Q of the frame 12. Therefore, the gap between the end face 33 of the contact member 32 and the vehicle-side edge E of the bracket 10 (the so-called gap) (b) is larger than in the conventional design, and as a result, the vehicle-side edge E of the bracket 10 is less likely to come into contact with the cut surface of the stump R. This allows for a larger dimension H from the cut surface of the stump R to the position where the end face 33 of the lower contact member 32 comes into contact. This prevents the cut surface of the stump R from chipping when the bracket 10 is pulled towards the vehicle to lift the stump R, and makes it less likely for the contact member 32 of the locking body 30 to come loose from the stump R, thereby improving functionality. 【0039】 Furthermore, the contact member 32 of the locking body 30 is positioned such that, when viewed from the side, the protruding direction X of the contact member 32 is inclined in a direction away from the vehicle-side edge E of the bracket 10 with respect to the rotation axis Q of the frame 12. Therefore, when the end face 33 of the contact member 32 is brought into contact with the outer surface of the stump R so that the protruding direction X of the contact member 32 is perpendicular to the outer surface of the stump R, the distance L (Figure 1) from the vehicle that extends outward from the arm 5 and bracket 10 can be reduced compared to the conventional method (distance La in Figure 9). As a result, it becomes easier to process the stump R near the vehicle, and the processing of the stump R can be performed while stabilizing the vehicle. 【0040】 Furthermore, in this case, since the contact member 32 of the locking body 30 is inclined, there is no need to make the base member 31 protrude for a long length, so it is strong against load and does not impair the load-bearing capacity of the locking body 30. Also, since the locking body 30 is provided on the bracket 10, the force against the stump R acts from the bracket 10 towards the arm 5, and does not act on the frame 12 or its rotation mechanism 11, so the rotation mechanism 11 is not burdened and damage is prevented. 【0041】 Furthermore, since the base member 31 of the locking body 30 is attached to the substrate 40, it is stronger against loads and its load-bearing capacity can be improved compared to the case where the base member 31 is directly attached to the bracket 10. In particular, since the abutment member 32 is welded and fixed to the base member 31 so as to be perpendicular to each other, the load acting in the protruding direction X of the abutment member 32 can be reliably received by the base member 31, and the substrate 40, which is in surface contact with the base member 31, also receives the load, making it even stronger against loads and improving its load-bearing capacity. Moreover, since the substrate 40 is welded and fixed on all four sides to the corresponding cover plate 16, base plate 14 and pair of side plates 15, the support strength to the bracket 10 is extremely high, which also improves its load-bearing capacity. 【0042】 Furthermore, in this case, since the locking body 30 is provided on the bracket 10, the force on the stump R acts from the bracket 10 towards the arm 5, and does not act on the frame 12 or its rotation mechanism 11, thus preventing damage to the rotation mechanism 11 without putting a load on it. Moreover, since the locking body 30 locks the end face 33 of the contact member 32, which is erected on the upper side of the base member 31, to the stump R, it becomes easier to transmit force to the stump R, thereby improving the efficiency of the stump extraction work. Furthermore, since the end face 33 of the contact member 32 is concave, it becomes easier to bring the end face 33 into contact with the outer curved surface of the stump R, and it becomes easier to distribute the local load on the stump R and transmit the full force without partially destroying it, so that it becomes even easier to transmit force to the stump R, thereby improving the efficiency of the stump extraction work. Furthermore, since the end face 33 of the contact member 32 is formed in a sawtooth shape, this sawtooth-shaped portion bites into the stump R, thereby ensuring secure locking. In this respect as well, it becomes easier to transmit force to the stump R, and the efficiency of the stump extraction work is improved accordingly. 【0043】 Then, once the stump R has been extracted, the grapple device G is moved to grip the stump R with the gripping member 20 and transport it to an appropriate location. In this case, the grapple device G can immediately perform its intended function after the stump R has been extracted, resulting in significantly better work efficiency and improved work productivity compared to using a dedicated machine or changing attachments, as well as reducing work costs. 【0044】 Furthermore, although the locking body 30 will wear out with use, the locking body 30 is detachable from the bracket 10 by bolts 43 and nuts 44. In such cases, the bolts 43 and nuts 44 can be loosened and removed to remove the locking body 30, a new locking body 30 can be installed, and the bolts 43 and nuts 44 can be tightened again to replace it. Since the locking body 30 is detachable by bolts 43 and nuts 44, the attachment and detachment operation is easy, improving work efficiency. In addition, elongated holes 45 for screwing in the bolts 43 and nuts 44 are formed in the base plate 14, which also makes the attachment and detachment operation easy and improves work efficiency. Furthermore, the contact member 32 can be replaced with one of a different shape, increasing its versatility. 【0045】 Figure 7 shows a grapple device G according to another embodiment of the present invention. Unlike the above, this device is of a type in which both one gripping member 20(A) and the other gripping member 20(B) rotate to open and close. The other configurations are the same as above, and it produces the same functions and effects. 【0046】 Figure 8 shows another example of the locking body 30. The locking body 30 shown in Figure 8(a) comprises a block-shaped base member 31 with an inclined upper surface, and a plate-shaped contact member 32 is welded to the inclined upper surface of this base member 31. The base member 31 is directly fixed to the base plate 14 with bolts 43 and nuts 44 without using the substrate 40 described above. This also produces the same function and effect as described above. 【0047】 Furthermore, the locking body 30 shown in Figure 8(b) is composed of a rectangular cross-section block-shaped member in which the base member 31 and the contact member 32 are integrated, and the bottom surface is inclined so that the contact member 32 faces a predetermined protruding direction. In this configuration, the base member 31 is directly fixed to the base plate 14 with bolts 43 and nuts 44 without using the substrate 40 described above. This also produces the same function and effect as described above. 【0048】 Furthermore, in the grapple device G described above, the shape of the locking body 30 is not limited to that described above and may be changed as appropriate. Also, the vehicle is not limited to the hydraulic excavator S described above, but may be applied to any vehicle, such as a hydraulic excavator with an extendable working arm 5b. Moreover, the present invention may also be applied to attachments having a swivel drive mechanism, such as a splitter equipped with tongs as a gripping member 20 for splitting wood, and may be applied as appropriate. In short, the present invention is not limited to the embodiments described above, and those skilled in the art can easily make many changes to these exemplary embodiments without substantially departing from the novel teachings and effects of the present invention, and many of these changes are included within the scope of the present invention. [Explanation of Symbols] 【0049】 S Hydraulic excavator (vehicle) G Grapple Device R Cutting roots 1. Vehicle body 2. Running body 3. Swivel mechanism 4. Rotating body 5 Arms 5a Boom 5b Work arm P pivot axis 7 Link mechanism 8 Cylinder device 10 brackets 11 Rotation mechanism Q Rotation axis 12 frames 14 base plate 15 Side panels E Vehicle side edge 16 Cover plate 20 Gripping member 22 Tongs 23 Erection rod 30 Locking body 31 Base member 32 Contact Member 33 End face X Projection direction 40 circuit boards 41,42 Through holes 43 volts 44 nuts 45 long hole

Claims

[Claim 1] The device comprises a bracket supported at the tip of an arm mounted on a drivable vehicle so as to be able to swing around a pivot axis, a frame mounted on the bracket so as to be able to rotate around a pivot axis via a rotation mechanism, and a gripping member mounted on the frame so as to be able to open and close and capable of gripping wood, A grapple device is provided on the vehicle side of the bracket, on the frame side, which is capable of engaging with a tree stump remaining on the ground after a tree has been felled, and the engaging body comprises a base member fixed to the bracket and a contact member erected on the base member so as to protrude toward the vehicle side beyond the vehicle-side edge of the bracket and having an end face capable of contacting the tree stump, A grapple device characterized in that the above-mentioned contact member is provided such that, when viewed from the side, the protruding direction of the contact member is inclined in a direction that moves away from the vehicle-side edge of the bracket with respect to the rotation axis of the frame. [Claim 2] The grapple device according to claim 1, characterized in that when the angle of the protruding direction of the contact member with respect to the rotation axis of the frame is θ, 5° ≤ θ ≤ 60°. [Claim 3] The bracket is configured to include a base plate on which the frame's rotation mechanism is provided, a pair of side plates provided on both sides of the base plate on which the pivot shaft is provided, and a cover plate provided in the center between the side plates to cover the rotation mechanism, wherein a base plate is mounted between the side plates above the base plate, and the base member of the locking body is detachably attached to the base plate, as described in claim 2. [Claim 4] A hydraulic excavator characterized by being equipped with a grapple device according to any one of claims 1 to 3 above.

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