Attachment for bucket

Abstract

To provide an attachment for a bucket that can change a bucket capacity while suppressing changes in a bucket width.SOLUTION: An attachment 50 for a bucket is attached to a bucket 104C which has a bucket body 8 whose bottom and top surfaces are formed by a curved bottom plate 2 and whose both side surfaces are formed by left and right side plates 3L, 3R provided on both the left and right sides of the bottom plate 2, and teeth 5 which are provided at one end of the bottom plate 2 forming a bottom surface, which is an end at the opening side of the bucket body 8 and which can be fitted with a first digging claw. The attachment 50 for a bucket has a frame body 14 attached to the opening side of the bucket body 8 and digging claws 75 provided on the frame body 14. The frame body 14 is provided with an adapter 6 which engages with the teeth 5.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a bucket attachment that is attached to a bucket of a work device. [Background technology]

[0002] Patent Document 1 discloses a bucket that is pivotally attached to the tip of an arm connected to a construction machine and operated, and that includes a bucket main body pivotally attached to the tip of the arm, a pair of sliding bucket side plates equipped with sliding ridges disposed on both sides of the bucket main body and that slide in the bucket width direction relative to the side edges of the bucket main body, a bucket width varying cylinder connected between the bucket main body and both bucket side plates, and a reinforcing plate that is detachably attached to the sliding ridges. In Patent Document 1, the bucket width is variable, and by widening the bucket width, it is possible to increase the bucket capacity. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 2-58054 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of a structure in which the bucket width is adjustable to change the capacity, changing the capacity could restrict or make difficult excavation work in narrow spaces or work to create trench shapes (so-called trench digging).

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bucket attachment that can change the bucket capacity while suppressing changes in the bucket width. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the present invention provides a bucket attachment that is attached to a bucket having a soil storage section with an opening, the bottom and top surfaces of which are formed by a curved bottom plate, both side surfaces of which are formed by left and right plates arranged on either side of the bottom plate, and a first claw mounting section that is arranged at one end of the bottom plate that forms the bottom surface and is at the end of the opening side of the soil storage section, and to which a first digging claw can be attached, the bucket attachment having a frame body that is attached to the opening side of the soil storage section, and a second digging claw that is arranged on the frame body, and the frame body having a first locking section that locks to the first claw mounting section. [Effects of the Invention]

[0007] According to the present invention, it is possible to change the bucket capacity while suppressing changes in the bucket width. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side view showing the external structure of a hydraulic excavator to which an embodiment of the present invention is applied. [Figure 2] 1 is an enlarged perspective view of a main portion showing a state in which a bucket attachment according to an embodiment of the present invention is attached to a bucket. FIG. [Figure 3] 3(a) is a perspective view of the bucket with the bucket attachment attached, FIG. 3(b) is a side view taken from the direction of the arrow A in FIG. 3(a), a perspective view of the bucket alone before the bucket attachment is attached, and FIG. 3(c) is a side view taken from the direction of the arrow B in FIG. [Figure 4] 3(b) is a cross-sectional side view of the bucket with the bucket attachment attached, and a partial arrow view from the direction of C in FIG. 3(b); FIG. 3(d) is a cross-sectional side view of the bucket alone before the bucket attachment is attached, and a partial arrow view from the direction of D in FIG. 3(d). [Figure 5] FIG. 2 is an exploded perspective view of the bucket attachment and the bucket. [Figure 6] 6(a) and 6(b) are a perspective view and a side view of the bucket attachment alone, respectively, taken from the direction of the arrow E in FIG. 6(a). [Figure 7] FIG. 2 is an exploded perspective view of the bucket attachment alone. [Figure 8] 8(a) and 8(b) are an enlarged perspective view and a cross-sectional view taken along the line KK in FIG. 8(a), respectively, showing the structure for attaching teeth on the bucket side to the adapter. [Figure 9] 9(b) is a side view for explaining the behavior of attaching a bucket attachment to a bucket body, and a cross-sectional view taken along the line MM in FIG. 9(a). FIG. [Figure 10] 10A and 10B are a perspective view showing the overall structure of a bucket attachment alone in a modified example in which the pitch between multiple adapters is adjustable, and a side view and a cross-sectional view showing a bucket with the bucket attachment attached. [Figure 11] 11(b) is an exploded perspective view for explaining the behavior of sliding the adapter in the axial direction, and a view seen from the direction of an arrow N in FIG. 11(a). [Figure 12] FIG. 10 is an exploded perspective view showing the overall structure of a single bucket attachment in a modified example in which the frame body has a divided structure. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the up-down direction, the front-rear direction, and the left-right direction correspond to the directions of the arrows shown in FIGS.

[0010] <Hydraulic excavator> 1 shows a hydraulic excavator 100 as a construction machine to which the present invention is applied. The hydraulic excavator 100 is suitable for use in excavation work and the like, and has a self-propelled lower body 102, an upper rotating body 103 rotatably mounted on the lower body 102, and a working device 104.

[0011] The working device 104 is provided on the front side of the upper rotating body 103 so as to be able to move up and down. The working device 104 is equipped with a boom 104A, an arm 104B, a bucket 104C, a boom cylinder 104D, an arm cylinder 104E, a bucket cylinder 104F, etc. The hydraulic excavator 100 performs work such as excavating earth and sand by rotating the boom 104A, arm 104B, and bucket 104C of the working device 104 while rotating the upper rotating body 103.

[0012] The upper rotating body 103 includes a rotating frame 105. The rotating frame 105 is rotatably attached to the lower traveling body 102 via a slewing ring 101. A boom 104A and a boom cylinder 104D of the working device 104 are attached to the front side of the revolving frame 105. A counterweight 107 is provided on the rear end side of the revolving frame 105 to balance the weight with the working device 104. An exterior cover 108 is provided on the front side of the counterweight 107 on the revolving frame 105. Inside the exterior cover 108, on-board equipment (not shown) such as a prime mover, hydraulic pump, and heat exchanger mounted on the revolving frame 105 is housed. A cab 109 is provided on the front left side of the revolving frame 105. Inside the cab 109, a driver's seat, a travel lever device, an operating lever device, etc. (none of which are shown) are arranged. In FIG. 1, a bucket attachment 50, which will be described later, is omitted from the illustration.

[0013] <Using a bucket attachment> When performing excavation work using the bucket 104C, there are cases where it is desired to variably adjust the excavation capacity, particularly to increase the excavation capacity, depending on the work site. The bucket attachment 50 of this embodiment is attached to the bucket 104C for such excavation capacity adjustment. Fig. 2 is an enlarged perspective view of the essential parts, showing the state in which the bucket attachment 50 is attached to the bucket 104C shown in Fig. 1. Also, Fig. 3(a) shows a perspective view of the bucket 104C with the bucket attachment 50 attached, and Fig. 3(b) shows a side view as viewed from the direction of the arrow A in Fig. 3(a). For comparison with Fig. 3(a) and Fig. 3(b), Fig. 3(c) shows a perspective view of the bucket 104C alone before the bucket attachment 50 is attached, and Fig. 3(d) shows a side view as viewed from the direction of the arrow B in Fig. 3(c). Also, Fig. 4(a) shows a side cross-sectional view of the bucket 104C with the bucket attachment 50 attached, and Fig. 4(b) shows a partial arrow view from the direction C in Fig. 3(b). Also, for comparison with Fig. 4(a) and Fig. 4(b), Fig. 4(c) shows a side cross-sectional view of the bucket 104C alone before the bucket attachment 50 is attached, and Fig. 4(d) shows a partial arrow view from the direction D in Fig. 3(d).

[0014] <Buckets and bucket attachments> As shown in Figures 2, 3(a) to 3(e), and 4(a) to 4(e), bucket 104C has a bucket body (earth and sand storage section) 8 that includes a bottom plate 2 that curves in a generally U-shape from the rear end toward the opening at the tip, and a left side plate 3L and a right side plate 3R that are provided on both the left and right sides of the bottom plate 2. The bottom plate 2 forms the bottom and top surfaces of the bucket body 8, and the left side plate 3L and right side plate 3R form both side surfaces of the bucket body 8. The interior of the bucket body 8 forms a space for storing excavated material.

[0015] The end of the opening side of the bucket body 8 has a plurality of teeth (first claw attachment portions) 5 (four in this example) arranged at equal intervals from one another, and the same number of excavation claws (first excavation claws) 70 (four in this example) removably attached to the teeth 5. Specifically, the teeth 5 are provided at an end (one end) of one side ON (see FIGS. 3(a) and 3(c)) of the bottom plate 2. Pins 26 (see FIGS. 3(c), 7(a), 7(b), 8(a), 8(b), etc.) inserted into through holes (not shown) passed through each excavation claw 70 are engaged with engagement holes 27 of the teeth 5 (see FIGS. 7(a), 7(b), 8(a), etc.), thereby attaching the excavation claws 70 to the teeth 5. The excavation claws 70 can be removed from the teeth 5 by removing the pins 26 inserted into the engagement holes 27 of the teeth 5. As will be described later, when the bucket attachment 50 is attached to the bucket 104C, the pin 26 is pulled out and the excavation claw 70 is removed from the tooth 5.

[0016] A bracket 7 for transmitting driving force from the bucket cylinder 104F to the bucket 104C is welded to the outer peripheral surface of the end (other end) of the other side OT (FIGS. 3(a) and 3(c)) of the bottom plate 2 of the bucket body 8. The bracket 7 is rotatably connected to the arm 104B of the working mechanism 104, and is equipped with left and right support plates 7L, 7R that are erected on the bucket body 8. Each of the left and right support plates 7L, 7R has a boss portion 7a with which a link mechanism that is operatively connected to the bucket cylinder 104F is rotatably engaged, and a boss portion 7b with which the tip of the arm 104B is rotatably engaged. In addition, a beam portion 7M having a substantially round bar shape is provided so as to be perpendicular to the surface direction of the left and right support plates 7L, 7R (in other words, so as to penetrate the left and right support plates 7L, 7R).

[0017] Furthermore, removable left and right side cutters 4L, 4R are provided so as to protrude from the left and right side plates 3L, 3R, respectively, toward the opening of the bucket body 8. More specifically, the left and right side plates 3L, 3R each have a through hole 23. The left side cutter 4L and the right side cutter 4R are attached to the left side plate 3L and the right side plate 3R, respectively, by a bolt 24 inserted into the through hole 23 and a nut 25 screwed onto the bolt 24. In this case, the bolt 24 is inserted into the through hole 23 so that its head, which is, for example, hexagonal, is located on the inner periphery of the bucket body 8 and its tip, onto which the nut 25 is screwed, is located on the outer periphery of the bucket body 8. As will be described later, when the bucket attachment 50 is attached to the bucket 104C, the bolts 24 and nuts 25 are unscrewed, thereby removing the left and right side cutters 4L, 4R from the left and right side plates 3L, 3R.

[0018] An exploded perspective view of the bucket attachment 50 and bucket 104C is shown in Fig. 5. As described above in Figs. 5 and 2, 3(a), 3(b), 4(a), and 4(b), in the bucket 104C with the bucket attachment 50 attached, the excavation claws 70 are removed from the teeth 5, and the left and right side cutters 4L, 4R are removed from the left and right plates 3L, 3R. For excavation work performed with the bucket attachment 50 attached to the bucket 104C, the bucket attachment 50 is provided with excavation claws 75 and side cutters 54L, 54R, which are used in place of the excavation claws 70 and left and right side cutters 4L, 4R.

[0019] <Detailed structure of bucket attachment> 6(a) and 6(b) show a perspective view of the bucket attachment 50 alone and a side view as viewed from the direction of an arrow E, and FIG. 7 shows an exploded perspective view.

[0020] 6, 7 and the above-mentioned Fig. 5, the bucket attachment 50 has a frame 14 that is attached to the opening side of the bucket body 8 with the excavation claws 70 and side cutters 4L, 4R removed from the bucket 104C as described above. In detail, the frame 14 is attached to the opening side of the bucket body 8 with the excavation claws 70 removed from the teeth 5 of the bucket 104C and the left and right side cutters 4L, 4R removed from the left and right side plates 3L, 3R.

[0021] <Frame> The frame body 14 has a left plate portion 14L on the left side plate 3L that engages with the opening side of the bucket body 8, a right plate portion 14R on the right side plate 3R that engages with the opening side of the bucket body 8, a front plate portion 14F that engages with the end side (one end side) of one side ON of the bottom plate 2 (see Figures 3(a) and 3(c)), i.e., engages with the tip end portion 2F, and a rear plate portion 14B that engages with the end side (other end side) of the other side OT of the bottom plate 2 (see Figures 3(a) and 3(c)), i.e., engages with the base end portion 2B (see Figure 5).

[0022] <Rear plate> The rear plate portion 14B is provided with a locking device (second locking portion) 53 that locks the frame body 14 to the bracket 7. In detail, the locking device 53 locks the frame body 14 by abutting against the beam portions 7M provided on the left and right support plates 7L, 7R of the bracket 7 from the bottom plate 2 side of the bucket body 8 (in other words, from the side of the excavated material storage space) (see FIG. 4(a) etc.).

[0023] <Left and right plate sections> The left plate portion 14L and the right plate portion 14R have upper step portions 14La, 14Ra and lower step portions 14Lb, 14Rb that are connected to the lower portions 14La, 14Ra and have an inwardly recessed stepped shape. The outer surfaces of the upper step portions 14La, 14Ra are approximately flush with the outer surfaces of the left and right plates 3L, 3R when attached to the bucket body 8. The lower step portions 14Lb, 14Rb fit inside the left and right plates 3L, 3R when attached to the bucket body 8.

[0024] The upper portions 14La, 14Ra of the left and right plate portions 14L, 14R are provided with a plurality of (three in this example) through holes 73 (side cutter mounting portions) to which the left and right side cutters 54L, 54R can be attached, respectively. The left and right side cutters 54L, 54R are detachably mounted to the through holes 73 of the left plate portion 14L and the right plate portion 14R, respectively, by bolts 74 inserted into the through holes 73 and nuts 79 threaded onto the bolts 74. At this time, the bolts 74 are inserted into the through holes 73 so that their generally hexagonal heads are positioned inside the frame body 14 and their tips, onto which the nuts 79 are threaded, are positioned outside the frame body 14. In addition, the left and right side cutters 4L and 4R removed from the bucket 104C as described above may be attached to the left and right plate portions 14L and 14R, respectively, with bolts 74 and nuts 79 and reused as the side cutters 54L and 54R.

[0025] Furthermore, the lower portions 14Lb, 14Rb of the left and right plate portions 14L, 14R are provided with a plurality of (three in this example) through holes 76. Each through hole 76 is positioned so as to overlap with the through hole 23 for fastening the side cutters 4L, 4R in the left and right side plates 3L, 3R when fitted inside the left and right side plates 3L, 3R during attachment to the bucket body 8. This allows, when attaching the bucket attachment 50 to the bucket body 8, the bolt 24 that was unscrewed when removing the left and right side cutters 4L, 4R to be passed through the through hole 76 in the lower portions 14Lb, 14Rb and the through hole 23 in the left and right side plates 3L, 3R, and then fastened with the nut 25 on the outside of the left and right side plates 3L, 3R. That is, the left and right plate portions 14L, 14R of the frame 14 are locked to the opening sides of the left and right plates 3L, 3R of the bucket 104C by the bolts 24 and nuts 25. The bolts 24 and nuts 25 function as third locking portions.

[0026] <Front plate> The front plate portion 14F is provided with a plurality (three in this example) of teeth (second claw mounting portions) 55 and a plurality (four in this example) of adapters (first locking portions) 6. The number of adapters (first locking portions) 6 provided is the same as the number of teeth (first claw mounting portions) 5 of the bucket 104C. Note that, although an example will be described in which a plurality of adapters 6 are provided in the same number as the number of teeth (first claw mounting portions) 5 of the bucket 104C, this is not limiting, and for example, only one adapter 6 may be provided at a position corresponding to any one of the teeth (first claw mounting portions) 5.

[0027] The teeth 55 are configured so that the excavation claws 75 can be attached and detached, and in this example, three of the excavation claws 75 are attached to three of the teeth 55. In detail, as shown in Fig. 7, the pins 56 inserted into the through holes 78 formed in each of the excavation claws 75 are engaged with the engagement holes 57 of the teeth 55, thereby attaching the excavation claws 75 to the teeth 55. The pins 56 inserted into the engagement holes 57 of the teeth 55 are removed, thereby making it possible to remove the excavation claws 75 from the teeth 55. For example, by making the excavation claw 75 and the excavation claw 70 of bucket 104C have the same shape, the excavation claw 70 removed from the tooth 5 of bucket 104C as described above can be attached to the tooth 55 using the pin 56 and reused as the excavation claw 75.

[0028] The adapter 6 has a storage space shaped like a recess that stores the tooth 5 from which the digging claw 70 has been removed, and stores the tooth 5 in it to lock the frame 14 to the bucket 104C. In detail, the adapter 6 has a through-hole 77 formed in a position that overlaps with the locking hole 27 of the tooth 5 when the tooth 5 is stored in the adapter 6 during attachment to the bucket body 8 (see FIG. 7(a) and the like). As a result, as shown in FIGS. 8(a), 8(b), and 7 and the like, when attaching the bucket attachment 50 to the bucket body 8, the pin 26, after the digging claw 70 has been removed, can be passed through the locking hole 27 of the tooth 5 and the through-hole 77 of the adapter 6 to fix the adapter 6 of the frame 14 of the bucket attachment 50 to the tooth 5 of the bucket body 8 of the bucket 104C.

[0029] <Attaching the bucket attachment frame to the bucket body> By configuring the bucket attachment 50 as described above, the frame body 14 of the bucket attachment 50 is attached to the bucket body 8 of the bucket 104C from which the excavation claws 70 and side cutters 4L, 4R have been removed, as shown in Figures 7(a), 7(b), and 9. At this time, as described above, with the locking devices 53 of the frame 14 locked to the bracket 7, the lower portions 14Lb, 14Rb of the left and right plate portions 14L, 14R and the left and right plate portions 3L, 3R of the bucket body 8 are fixed with the bolts 24 and nuts 25 that pass through the through holes 76, 23. In addition, the adapters 6 of the frame 14 and the teeth 5 of the bucket body 8 are fixed with the pins 26 that pass through the through holes 77 and the locking holes 27.

[0030] <Effects of the embodiment> As described above, the bucket attachment 50 of this embodiment is provided on the opening side of the bucket 104C of the work implement 104. The bucket 104C has a bucket body 8 including left and right plates 3L, 3R and a bottom plate 2, and the frame 14 of the bucket attachment 50 is attached to the opening side of the bucket body 8. During this attachment, the digging claws 70 attached to the teeth 5 of the bucket 104C are removed, and the adapters 6 provided on the frame 14 of the bucket attachment 50 are engaged with the teeth 5 in a state where the digging claws 70 have been removed. This allows the bucket attachment 50 to be stably held on the opening side of the bucket body 8 of the bucket 104C. The bucket attachment 50 also has digging claws 75. This allows the work device 104 to perform desired excavation work, etc., using the digging claws 75 of the bucket attachment 50 held on the opening side of the bucket body 8.

[0031] According to this embodiment, the frame 14 of the bucket attachment 50 is attached to the opening side of the bucket body 8, thereby increasing the bucket capacity toward the opening side. This makes it possible to change the bucket capacity while suppressing changes in the width of the bucket 104C. As a result, it is possible to prevent restrictions and difficulties that arise when excavating in narrow spaces or digging trenches, as occurs in conventional technologies where the bucket width is adjustable. In addition, compared to preparing two types of buckets in advance to change the bucket capacity, there are also effects such as reducing the transportation weight and reducing the installation space required on the transportation truck and at the site of use.

[0032] Furthermore, particularly in this embodiment, the frame 14 has a left plate portion 14L, a right plate portion 14R, a front plate portion 14F, and a rear plate portion 14B. The adapter 6 provided on the front plate portion 14F is locked to the teeth 5 of the bucket 104C, and the locking device 53 provided on the rear plate portion 14B is locked to the bracket 7 on the back side of the bottom plate 2 of the bucket 104C. This allows the bucket attachment 50 to be reliably and stably held against the opening side of the bucket body 8 of the bucket 104C.

[0033] Furthermore, particularly in this embodiment, when attaching the bucket attachment 50, for example, the left and right side cutters 4L, 4R provided on the side plates 3L, 3R of the bucket 104C are removed, and in this removed state, the left plate portion 14L and the right plate portion 14R of the frame 14 are locked to the opening sides of the left plate 3L and the right plate 3R of the bucket 104C with bolts 24 and nuts 25. Meanwhile, at this time, the left plate portion 14L and the right plate portion 14R of the frame 14 of the bucket attachment 50 are provided with through-holes 73 into which the removed left and right side cutters 4L, 4R can be attached. As a result, the left and right side cutters 4L, 4R removed from the bucket 104C when attaching the bucket attachment 50 can be attached to the through-holes 73 in the left plate portion 14L and the right plate portion 14R of the frame 14 of the bucket attachment 50 and reused as (left and right side cutters 54L, 54R).

[0034] Furthermore, in this embodiment in particular, the left and right side cutters 4L, 4R or the left and right side cutters 54L, 54R are bolted to the through holes 23, 73 of the left and right side plates 3L, 3R or the left plate portions 14L, 14R, so that the above-mentioned replacement work can be easily carried out with a simple structure.

[0035] Furthermore, when the left and right side cutters 4L, 4R or 54L, 54R are bolted as described above, if the tips of the bolts 24, 74 were positioned on the side of the excavated material storage space, the volume of soil that can be stored after excavation would be reduced due to the tips protruding inward. Alternatively, foreign matter contained in the excavated soil could interfere with or get caught on the tips of the bolts 24, 74, causing problems during work. In particular, in this embodiment, the heads of the bolts 24, 74 are positioned on the excavated material storage space side (in other words, inside the frame body 14), thereby making it possible to avoid the above-mentioned problems.

[0036] Furthermore, particularly in this embodiment, the front plate portion 14F of the frame body 14 is provided with teeth 55 to which the excavation claws 75 can be removably attached. By making the excavation claws 75 used for excavation after the bucket attachment 50 is attached detachable from the frame body 14, adjustment and maintenance of the excavation claws 75 can be facilitated. Furthermore, as described above, the excavation claws 70 removed from the bucket 104C when the bucket attachment 50 is attached can be attached to the teeth 55 of the frame 14 of the bucket attachment 50 (as the excavation claws 75) and used. This allows the excavation claws of the bucket 104C that were used before the attachment was attached to be reused after the attachment is attached, reducing the need to prepare new excavation claws.

[0037] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit and technical concept of the present invention. Such modifications will be described below in order. The same reference numerals will be used to designate parts equivalent to those in the above-described embodiment, and descriptions will be omitted or simplified as appropriate.

[0038] (1) When the pitch between multiple adapters can be adjusted Fig. 10(a) shows a perspective view illustrating the overall structure of the bucket attachment 150 alone according to this modified example, Fig. 10(b) shows a side view of the bucket 104C with the bucket attachment 150 attached, and Fig. 10(c) shows a cross-sectional view. Fig. 11(a) shows an exploded perspective view illustrating the behavior of the adapter when it is slid in the axial direction, and Fig. 11(b) shows a view seen from the arrow N in Fig. 11(a).

[0039] 10(a) to 10(c), 11(a), and 11(b), like the bucket attachment 50 of the above embodiment, the bucket attachment 150 is attached to the opening side of the bucket body 8 of the bucket 104C. As in the above embodiment, in the bucket 104C with the bucket attachment 150 attached, the digging claws 70 are removed from the teeth 5, and the left and right side cutters 4L, 4R are removed from the left and right plates 3L, 3R. For excavation work performed with the bucket attachment 150 attached to the bucket 104C, the bucket attachment 150 is provided with digging claws 75 and side cutters 54L, 54R that are used in place of the digging claws 70 and left and right side cutters 4L, 4R.

[0040] <Detailed structure of bucket attachment> The bucket attachment 150 has a frame 114 that is attached to the opening side of the bucket body 8 with the excavation claws 70 and side cutters 4L, 4R removed from the bucket 104C as described above. Similar to the frame 14 of the bucket attachment 50, the frame 114 is attached to the opening side of the bucket body 8 with the excavation claws 70 removed from the teeth 5 of the bucket 104C and the left and right side cutters 4L, 4R removed from the left and right side plates 3L, 3R.

[0041] <Frame> The frame body 114 has a left plate portion 114L that engages with the opening side of the left side plate 3L of the bucket 104C, a right plate portion 114R that engages with the opening side of the right side plate 3R, a front plate portion 114F that engages with the tip end portion 2F of the bottom plate 2 of the bucket 104C, and a rear plate portion 114B that engages with the base end portion 2B of the bottom plate 2.

[0042] <Rear plate> The rear plate portion 114B is provided with a locking device (second locking portion) 153 that locks the frame body 114 to the bracket 7 of the bucket 104C. In this example, the locking device 153 has an arc-shaped cross section, which differs from the locking device 53 of the bucket attachment 50. The locking device 153 locks the frame body 114 by abutting against the bottom plate 2 side (in other words, from the excavated material storage space side) along the outer circumferential surface of the beam portion 7M of the bracket 7 (see FIG. 10(c) and the like).

[0043] <Left and right plate sections> The left plate portion 114L and the right plate portion 114R have a plurality of (three in this example) through holes 73 (side cutter mounting portions) to which the left and right side cutters 54L, 54R can be attached, respectively. The left and right side cutters 54L, 54R are attached to the left plate portion 114L and the right plate portion 114R, respectively, by bolts 74 inserted into the through holes 73 and nuts 79 threaded onto the bolts 74. As in the above embodiment, the head of the bolt 74 is located inside the frame body 114, and the tip onto which the nut 79 threads is located outside the frame body 114. In this modified example, the left and right side cutters 4L, 4R detached from the bucket 104C may also be reused.

[0044] <Front plate> The front plate portion 114F is provided with teeth (second claw mounting portions) 55. One of the features of this modified example is that, based on the configuration in which the adapter 106 is supported via a sliding support mechanism 120 described below, the number of teeth 55 can be the same as the number of teeth 5 of the bucket attachment 50 (four in this example).

[0045] As in the above embodiment, the teeth 55 are configured so that the excavation claws 75 can be removably attached, and in this example, four of the excavation claws 75 are attached to four teeth 55. The pins 56 inserted into the through holes 78 formed in each excavation claw 75 are engaged with the engagement holes 57 of the teeth 55, thereby attaching the excavation claws 75 to the teeth 55. As described above, the excavation claws 70 removed from the teeth 5 of the bucket 104C may be reused as the excavation claws 75.

[0046] <Adapter and sliding support mechanism> One of the features of this modification is that a sliding support mechanism 120 is provided on the front plate portion 114F, and a plurality of (four in this example) adapters (first locking portions) 106 are supported on the front plate portion 114F via this sliding support mechanism 120. The sliding support mechanism 120 allows the adapters 106 to slide laterally in accordance with the attachment positions of the teeth 5. The sliding support mechanism 120 includes a shaft 112 extending laterally through a through-hole 111 provided in the adapter 106 and slidably supporting each adapter 106, and shaft brackets 113L, 113R for supporting the left and right ends of the shaft 112 and fixing them to the frame 14. As shown in FIGS. 11(a) and 11(b), each adapter 106 can be slid to a desired position, for example, manually, along the shaft 112 passing through the through-hole 111 (see the black arrow in FIG. 11(a)). Note that, although an example will be described in which all of the multiple adapters (first locking portions) 106 are slidable relative to each other, this is not limiting; for example, only some of the multiple adapters (first locking portions) 106 may be configured to be slidable.

[0047] Like the adapter 6 in the above embodiment, the adapter 106 has a substantially recessed storage space for storing the tooth 5 from which the digging claw 70 has been removed, and storing the tooth 5 locks the frame body 114 to the bucket 104C. The adapter 106 is provided with a through-hole 77 similar to that of the adapter 6, and is configured so that when the tooth 5 is stored during attachment to the bucket body 8, the pin 26 can be finely adjusted by sliding as described above so as to overlap with the locking hole 27 of the tooth 5. As a result, like in the above embodiment, when attaching the bucket attachment 150 to the bucket body 8, the pin 26, after the digging claw 70 has been removed, can be passed through the locking hole 27 of the tooth 5 and the through-hole 77 of the adapter 106, thereby fixing the adapter 106 of the frame body 114 of the bucket attachment 150 to the tooth 5 of the bucket body 8 of the bucket 104C (see FIG. 11(a)).

[0048] <Axis bracket engagement area> On the other hand, in this modified example, engagement regions 113La, 113Ra for engaging with the bucket 104C are integrally provided on the rear sides of the shaft brackets 113L, 113R. These engagement regions 113La, 113Ra each have a plurality of (three in this example) through-holes (not shown). The engagement regions 113La, 113Ra are configured to be in close contact with or fitted into the outer sides of the left and right side plates 3L, 3R, respectively, when attached to the bucket body 8 (see FIG. 10(b) and the like). Each of the through-holes provided in the engagement regions 113La, 113Ra is positioned so as to overlap with the through-holes 23 (see FIG. 5) for fixing the side cutters 4L, 4R in the left and right side plates 3L, 3R in the close contact or fitted state. As a result, when attaching the bucket attachment 150 to the bucket body 8, the bolts 24 that were unscrewed when the left and right side cutters 4L, 4R were removed can be passed through the through holes in the engagement regions 113La, 113Ra and the through holes 23 in the left and right side plates 3L, 3R, and then fastened using nuts 25 outside the engagement regions 113La, 113Ra (see Figures 10(a) and 10(b)).

[0049] <Effects of the modified version> In this modified example, the same effects as those of the above embodiment are obtained. Furthermore, in this modification, the sliding support mechanism 120 allows the adapter 106 to slide left and right in accordance with the attachment position of the tooth 5, making it possible to appropriately adjust the pitch between adjacent adapters 106. As a result, when the adapter 106 is engaged with the tooth 5 of the bucket 104C, appropriate adjustments can be made to accommodate subtle deformation or wear of the tooth 5 due to aging, etc., thereby improving the fit between the adapter 106 and the tooth 5 when engaged and achieving stable attachment.

[0050] (2) When the frame body is a divided structure FIG. 12 is an exploded perspective view showing the overall structure of a bucket attachment 250 according to this modified example.

[0051] As shown in Figure 12, in the frame body 214 of the bucket attachment 250, the front plate portion 14F and the right plate portion 14R are integrally formed as a first plate body 201, and the left plate portion 14L and the rear plate portion 14B are integrally formed as a second plate body 202. The right plate 14R of the first plate 201 and the rear plate 14B of the second plate 202 are configured to be detachable by an appropriate mechanism (right detachable portion) not shown, for example, bolt fastening. The left plate 14L of the second plate 202 and the front plate 14F of the first plate 201 are configured to be detachable by an appropriate mechanism (left detachable portion) not shown, for example, bolt fastening. When used as a bucket attachment 250, the first plate 201 can be attached and coupled to the second plate 202 using the appropriate mechanism (see the dashed arrows in FIG. 12), allowing it to be used in the same way as the bucket attachment 50 of the above embodiment.

[0052] According to this modification, the bucket attachment 250 has a two-piece structure, and by separating it into two pieces as shown in FIG. 12 when not in use, the space required for storage can be reduced.

[0053] In addition to the above, the methods according to the above embodiments and modifications may be used in appropriate combination.

[0054] Although not specifically illustrated, the present invention can be implemented with various modifications within the scope of the invention. [Explanation of symbols]

[0055] 2 Bottom plate 3L left side plate 3R right side plate 4L Left side cutter 4R Right Side Cutter 5 Tooth (first claw mounting part) 6 Adapter (first locking part) 7 Bracket 8 Bucket body (earth and sand storage section) 14 Frame 14B Rear plate part 14F front panel 14L left plate part 14R right plate 23 Through hole 24 volts 50 Bucket Attachment 53 Locking device (second locking part) 54L Left Side Cutter 54R Right Side Cutter 55 Tooth (second claw mounting part) 70 Excavation claw (first excavation claw) 73 Through hole (side cutter mounting part) 74 volts 75 Excavation claw (second excavation claw) 76 Through Hole 77 Through Hole 78 Through Hole 79 Nut 100 Hydraulic Excavator 102 Undercarriage 103 Upper rotating body 104 Work equipment 104C Bucket 106 Adapter (first locking part) 111 Through hole 112 Through shaft 113L, 113R Axle bracket 114 Frame 114B Rear plate part 114F Front plate part 114L Left plate part 114R Right plate part 120 Sliding support mechanism 150 Bucket Attachment 153 Locking device (second locking part) 201 1st plate 202 Second plate 214 Frame 250 Bucket Attachment

Claims

1. A bucket attachment is attached to a bucket having a bottom surface and a top surface formed by a curved bottom plate, both side surfaces formed by left and right plates provided on both the left and right sides of the bottom plate, a soil storage section having an opening, and a first claw mounting section provided at one end of the bottom plate that forms the bottom surface and is at the end of the opening side of the soil storage section, to which a first excavation claw can be attached, A frame body attached to the opening side of the soil storage section; A second excavation claw provided on the frame body; and The frame body is a first engaging portion that is engaged with the first claw mounting portion; A bucket attachment characterized by:

2. The bucket attachment according to claim 1, The frame body is a left plate portion that engages with the opening side of the left side plate; a right plate portion that engages with the opening side of the right side plate; a front plate portion that engages with the one end side of the bottom plate; A rear plate portion that is an end portion of the opening side of the soil storage portion and is engaged with the other end side of the bottom plate that forms the upper surface; and the front plate portion of the frame body includes the first locking portion, The rear plate portion of the frame body is a second engaging portion that engages with a bracket for transmitting a driving force to the bucket, the second engaging portion being provided on the other end of the opening side of the bucket; A bucket attachment characterized by:

3. The bucket attachment according to claim 2, a side cutter that is detachable from the left plate portion and the right plate portion of the frame body; the left plate portion and the right plate portion of the frame body have third engaging portions that engage with the opening sides of the left side plate and the right side plate of the bucket; a side cutter mounting portion to which the side cutter is attached; A bucket attachment characterized by:

4. The bucket attachment according to claim 3, The side cutter mounting portion is through holes formed in the left plate portion and the right plate portion, The side cutter is The left plate portion and the right plate portion are attached to the side cutter attachment portions by bolts inserted into the through holes and nuts screwed onto the bolts. A bucket attachment characterized by:

5. The bucket attachment according to claim 2, The front plate portion of the frame body is a second claw mounting portion to which the second excavation claw can be detachably attached; The second claw attachment portion is The first excavation claw detached from the first claw attachment portion of the bucket is configured to be detachable as the second excavation claw. A bucket attachment characterized by:

6. The bucket attachment according to claim 2, the front plate portion includes a slide support mechanism that allows the first locking portion to slide in the left-right direction in accordance with the mounting position of the first claw mounting portion, The first engaging portion has a through-hole penetrating in the left and right directions, The sliding support mechanism is a shaft provided on the front plate portion and extending in the left-right direction, the shaft being inserted into the through hole of the first locking portion; a shaft bracket for fixing the shaft to the frame body; A bucket attachment characterized by:

Images