【書類名】 明細書
【発明の名称】 ショベル機械のバケット本体に付設するアダプタ部材とツース部材との固定手段
【特許請求の範囲】
【請求項１】 バケット本体の掬土位置に付設するアダプタ部材の係合凸部にツース部材の係合凹部を被嵌し、駒部材を係合凸部に設けた長孔に挿入し、駒部材と係合凸部の長孔と係合凹部の長孔との間にロック部材を打ち込んでアダプタ部材とツース部材とを一体的に固定する駒部材とロック部材とよりなる固定手段であって、この駒部材の係合凸部の長孔との当接部を型込め法によりブロック板体の側端平面部に弾性合成樹脂体を一体物で形成し、このブロック板体の他側端部に係止凹部を設け、ロック部材に前記係止凹部に係合してアダプタ部材にツース部材を一体的に固定する係合凸部を設けたことを特徴とするショベル機械のバケット本体に付設するアダプタ部材とツース部材との固定手段。
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】
本発明は、ショベル機械のバケット本体に付設するアダプタ部材とツース部材との固定手段に係わるものである。
【０００２】
【従来の技術及び発明が解決しようとする課題】
従来のショベル機械等のバケット本体Ａに付設するアダプタ部材１とツース部材３との固定手段は図５のものが知られている。
【０００３】
この従来構造の固定手段は、ショベル機械のバケット本体Ａの掬土位置にアダプタ部材１の基部を溶接その他の方法により止着し、アダプタ部材１の係合凸部２にツース部材３の係合凹部４を被嵌し、ツース部材３の係合凹部４に設けた長孔７より図５のような形状の駒部材35を挿入してアダプタ部材１に設けた係合凸部２の長孔６に嵌入し、この駒部材35と係合凸部２の長孔６とツース部材３の係合凹部４に設けた長孔７との間にロック部材38を打ち込んでアダプタ部材１にツース部材３を一体的に固定していたが、この従来型の固定手段の駒部材35は小円筒形状の複数個（図では３個）の金属製の駒コロ体35 1 を並列に並べ、駒コロ体35 1 の半円筒部を型込め法により弾性合成樹脂体352に埋め込んで一体物で形成し、ロック部材38の中央部に前記駒部材35の複数個の駒コロ体35 1 の突出半円筒部に係合する係合凹部39を設け、ロック部材38を打ち込むと駒部材35の駒コロ体351がロック部材38の係合凹部39に押圧されて弾性合成樹脂体352が撓み、この撓みによる弾性合成樹脂体35 2 の弾性復元力によりアダプタ部材１にツース部材３が一体的に固定されていたが、この固定手段ではショベル機械のバケットが苛酷な作業状態で使用され続けると、アダプタ部材１とツース部材３の上下方向，前後方向の相対的な繰り返し荷重により半円筒形状の駒コロ体351と弾性合成樹脂体352との接合部が繰り返しの接触応力により剥離し、駒部材35の弾性復元力が衰えて駒部材35とロック部材38によるアダプタ部材１とツース部材３との一体的固定力が弱まり、作業中にアダプタ部材１とツース部材３との嵌合部に摩耗によるガタが促進し、ツース部材３がアダプタ部材１より脱落する欠点があった。
【０００４】
本発明は駒部材５を構成するブロック板体５1の側端平面部に型込め法により弾性合成樹脂体５2を一体物で形成することによりアダプタ部材１及びツース部材３に掛かる相対的な荷重を弾性合成樹脂体５2に均一にかかるように形成して上記欠点を解決したショベル機械のバケット本体に付設するアダプタ部材とツース部材との固定手段を提供するものである。
【０００５】
【課題を解決するための手段】
添付図面を参照して本発明の要旨を説明する。
【０００６】
バケット本体Ａの掬土位置に付設するアダプタ部材１の係合凸部２にツース部材３の係合凹部４を被嵌し、駒部材５を係合凸部２に設けた長孔６に挿入し、駒部材５と係合凸部２の長孔６と係合凹部４の長孔７との間にロック部材８を打ち込んでアダプタ部材１とツース部材３とを一体的に固定する駒部材５とロック部材８とよりなる固定手段ａであって、この駒部材５の係合凸部２の長孔６との当接部を型込め法によりブロック板体５1の側端平面部に弾性合成樹脂体５2を一体物で形成し、このブロック板体５1の他側端部に係止凹部５3を設け、ロック部材８に前記係止凹部５3に係合してアダプタ部材１にツース部材３を一体的に固定する係合凸部９を設けたことを特徴とするショベル機械のバケット本体に付設するアダプタ部材とツース部材との固定手段に係るものである。
【０００７】
【発明の実施の形態】
本発明の実施の形態を作用効果を示して実施の一例である図面に基づいて説明する。
【０００８】
アダプタ部材１の嵌合凸部２にツース部材３の係合凹部４を被嵌し、駒部材５をアダプタ部材１の係合凸部２に設けた長孔６に挿入し、駒部材５のブロック板体５1とアダプタ部材１に設けた長孔６とツース部材３の係合凹部４に設けた長孔７の間にロック部材８を打ち込むと、ロック部材８の係合凸部９が駒部材５のブロック板体５1を介して弾性合成樹脂体５2を強く圧縮しながらブロック板体５1上を移動し、係合凹部５3に係合凸部９が嵌入するとロック部材８が駒部材５の弾性合成樹脂体５1を強く圧縮し、ロック部材８の上下端部が長孔７の基部に強く当接して駒部材５とロック部材９とが一体的に確固に固定され、弾性合成樹脂体５2の弾性復元力によりアダプタ部材１にツース部材３が一体的で固定される。
【０００９】
稼働中アダプタ部材１・ツース部材３の相互の間に掛かる相対的な荷重はロック部材８の上下端部及び駒部材５で支承され、弾性合成樹脂体５2に掛かる荷重はブロック板体５1の側端平面部及び係合凸部２の長孔６とにより均等な平面分布荷重となるため、相対的な連続繰り返し荷重がかっても剥離することがなく復元力を保持し、アダプタ部材１にツース部材３が強固に固定され続ける。
【００１０】
【実施例】
添付図面は本発明に好適な実施の一例を図示したもので、図１は本発明の使用状態を図示した斜視図、図２，３は本発明の第一実施例、図４は第２実施例、図５は従来の固定手段の駒部材35とロック部材38の係合凹部39を示す要部の説明図である。
【００１１】
図示した図面はバケット本体Ａの掬土位置にアダプタ部材１の基部を溶接その他の方法により止着し、アダプタ部材１の緩やかな矩形角錐台形状の係合凸部２にツース部材３の係合凹部４を被嵌し、駒部材５をツース部材３の長孔７を経由して係合凸部２に設けた長孔６に挿入し、駒部材５と係合凸部２の長孔６と係合凹部４の長孔７との間にロック部材８を打ち込んでアダプタ部材１とツース部材３とを一体的に固定する駒部材５とロック部材８とよりなる固定手段ａを図示している。
【００１２】
駒部材５の係合凸部２の長孔６との当接部を型込め法によりブロック板体５1の側端平面部に弾性合成樹脂体５2を一体物で形成し、このブロック板体５1の他側端部に係止凹部５3を設け、ロック部材８に前記係止凹部５3に係合してアダプタ部材１にツース部材３を一体的に固定する係合凸部９を設ける。
【００１３】
図示した駒部材５はブロック板体５1と弾性合成樹脂体５2とで形成し、厚板形状のブロック板体５1の一側端平面部に弾性合成樹脂体５2とのモールド面積を増大し、弾性合成樹脂体５2がブロック板体５1にしっかりとモールドされるよう側面より見て凹状平面部５4を刻設し、他側端面部にロック部材８の係合凸部９に係合する図３に示すような係止凹部５3を形成し、このブロック板体５1の一側端面部に型込め法により硬度の高い弾性合成樹脂体５2を一体物でモールドして駒部材５を形成する。図示した弾性合成樹脂体５2はその上下の端面が係合凹部４の矩形角錐台凹部の上下の辺に係合するよう上下の辺を先端に向け下り勾配を付し、駒部材５がロック部材８により押圧されたとき係合凹部４の上下面に勾配面が接触して駒部材５を強固に係合凹部４に固定するように形成する。
【００１４】
また、図示した厚板で形成したロック部材８はその中央部に前記駒部材５の係止凹部５3に係合する係合突部９を設けて形成する。
【００１５】
また、図４は本発明の第二実施例を図示したもので、駒部材５のブロック板体５1の第一実施例の係止凹部５3の代わりに半円板形状の係止突部５3'を並列状に突設し、これに係合するロック部材８の係合部を半円凹形状に形成したもので第一実施例と同様の作用効果を呈する。
【００１６】
本発明の実施例を上記のように構成したので、アダプタ部材１の係合凸部２にツース部材３の係合凹部４を被嵌し、駒部材５を係合凸部２の長孔６に挿入し、駒部材５と係合凸部２の長孔６と係合凹部４の長孔７との間にロック部材８を打ち込むと、ロック部材８の係合凸部９が駒部材５のブロック板体５1を介して弾性合成樹脂体５2を圧縮しながらブロック板体５1上を移動して打ち込まれ、係合凹部５3に係合凸部９が嵌入すると駒部材５とロック部材８が一体的に係止され、弾性合成樹脂体５2の弾性復元力によりアダプタ部材１にツース部材３が一体物で確固に固定される。
【００１７】
稼働中アダプタ部材１及びツース部材３の相互の間に掛かる相対的な荷重をロック部材８の上下端部及び駒部材５で支承し、駒部材５の弾性合成樹脂体５2に掛かる荷重はブロック板体５1の側端平面部及び係合凸部２の長孔６により均等な平面分布荷重となるため相対的な連続繰り返し荷重がかかってもブロック板体５1と弾性合成樹脂体５2とが剥離することがなく弾性合成樹脂体５2の弾性復元力を維持し、ガタつきも生じなく安全に機能し得るので、従来例の小円筒形状の駒コロ体351を弾性合成樹脂体352にモールドした駒部材35のように、駒コロ体351と弾性合成樹脂体352との接合部が繰り返し接触応力により剥離し、駒部材35の弾性復元力が衰えて駒部材35とロック部材38によるアダプタ部材１とツース部材３との一体的固定力が弱まり、アダプタ部材１とツース部材３の相互の繰り返し荷重によりアダプタ部材１とツース部材３との嵌合部に摩耗によるガタが生じ、ツース部材３がアダプタ部材１より脱落するような欠点がない秀れたショベル機械のバケット本体に付設するアダプタ部材とツース部材との固定手段となる。
【００１８】
【発明の効果】
本発明は上記のように駒部材をブロック板体の側端平面部に型込め法により弾性合成樹脂で一体物で形成し、且つこのブロック板体の他側端部に係止凹部を設けてこの係止凹部に係合してアダプタ部材にツース部材を一体的に固定するロック部材に係合凸部を設けたので、バケット作業中に発生するアダプタ部材とツース部材の間に掛かる相対的な荷重をロック部材の上下端部とツース部材の長孔及びロック部材と駒部材とで支承し、駒部材の弾性合成樹脂体はブロック板体の側端平面部及び係合凸部の長孔により均等な平面分布荷重を支承することとなるため、弾性合成樹脂体とブロック板体とが剥離することがなく弾性合成樹脂体の復元力を保持できるため、アダプタ部材よりツース部材が脱落することのない実用的で経済的な秀れた効果を有するショベル機械のバケット本体に付設するアダプタ部材とツース部材との固定手段となる。
【図面の簡単な説明】
【図１】
本発明の使用状態を示す斜視図である。
【図２】
本発明の第一実施例の分解斜視図である。
【図３】
上記の要部の断面図である。
【図４】
本発明の第二実施例の要部の一部を切欠いた説明図である。
【図５】
従来の固定手段の要部の一部を切欠いた説明図である。
【符号の説明】
１ アダプタ部材
２ 係合凸部
３ ツース部材
４ 係合凸部
５ 駒部材
５1 ブロック板体
５2 弾性合成樹脂体
５3 係止凹部
６ 長孔
７ 長孔
８ ロック部材
９ 係合凸部
ａ 固定部材
Ａ バケット本体
[Document name] Specification [Title of invention] Fixing means for connecting an adapter member attached to a bucket body of a shovel machine and a tooth member [Claims]
[Claim 1] A fixing means comprising a bridge member and a locking member, in which the engaging recess of the tooth member is fitted onto the engaging protrusion of the adapter member attached to the scooping position of the bucket body, the bridge member is inserted into the elongated hole provided in the engaging protrusion, and a locking member is driven between the bridge member, the elongated hole of the engaging protrusion, and the elongated hole of the engaging recess to fix the adapter member and the tooth member together, wherein the abutment portion of the engaging protrusion of the bridge member with the elongated hole is formed as a single elastic synthetic resin body on the flat side end portion of the block plate body by a molding method, a locking recess is provided on the other side end of the block plate, and an engaging protrusion is provided on the locking member that engages with the locking recess to fix the tooth member to the adapter member together.
Detailed Description of the Invention
[0001]
[Technical Field to which the Invention Belongs]
The present invention relates to a fixing means for fixing a tooth member to an adapter member attached to a bucket body of a shovel machine.
[0002]
[Prior art and problems to be solved by the invention]
A known fixing means for fixing a tooth member 3 to an adapter member 1 attached to a bucket body A of a conventional excavator or the like is shown in FIG.
[0003]
In the fixing means of this conventional structure, the base of the adapter member 1 is fixed to the scooping position of the bucket body A of the excavator by welding or other means, the engaging recessed portion 4 of the tooth member 3 is fitted over the engaging protrusion 2 of the adapter member 1, a bridge member 35 of the shape shown in FIG. 5 is inserted through the elongated hole 7 formed in the engaging recessed portion 4 of the tooth member 3 and fitted into the elongated hole 6 of the engaging protrusion 2 formed in the adapter member 1, and a locking member 38 is driven between the bridge member 35, the elongated hole 6 of the engaging protrusion 2, and the elongated hole 7 formed in the engaging recessed portion 4 of the tooth member 3 to fix the tooth member 3 integrally to the adapter member 1. However, the bridge member 35 of this conventional fixing means is formed by arranging a plurality of small cylindrical metal bridge roller bodies 351 ( three in the figure ) in parallel, embedding the semi-cylindrical portions of the bridge roller bodies 351 in an elastic synthetic resin body 352 by molding, and forming an integral body. When the locking member 38 is driven in, the bridge roller body 351 of the bridge member 35 is pressed against the engaging recess 39 of the locking member 38, causing the elastic synthetic resin body 352 to bend. This bending causes the elastic restoring force of the elastic synthetic resin body 352 to fix the tooth member 3 to the adapter member 1 as a unit. However, with this fixing method, if the bucket of the excavator is used continuously under severe working conditions, the joint between the semi-cylindrical bridge roller body 351 and the elastic synthetic resin body 352 will peel off due to repeated contact stress due to repeated relative loads on the adapter member 1 and tooth member 3 in the up-down and back-to-front directions. This weakens the elastic restoring force of the bridge member 35, weakening the fixing force between the adapter member 1 and tooth member 3 by the bridge member 35 and the locking member 38. This causes wear and loosening of the fitting between the adapter member 1 and tooth member 3 during work, which can cause the tooth member 3 to fall off the adapter member 1.
[0004]
The present invention provides a means for fastening an adapter member and tooth member to be attached to the bucket body of a shovel machine , which solves the above-mentioned drawbacks by forming an elastic synthetic resin body 52 as a single unit by molding onto the flat side end portion of the block plate body 51 that constitutes the bridge member 5 , so that the relative load acting on the adapter member 1 and tooth member 3 is evenly distributed across the elastic synthetic resin body 52.
[0005]
[Means for solving the problem]
The gist of the present invention will be explained with reference to the accompanying drawings.
[0006]
The fixing means (a) comprises a bridge member (5) and a locking member (8) that integrally fixes the adapter member (1) and tooth member (3) by fitting the engaging protrusion (2) of the adapter member (1) at the scooping position of the bucket body (A) into the engaging recess (4) of the tooth member (3 ), inserting the bridge member (5) into the elongated hole (6) formed in the engaging protrusion (2), and driving a locking member (8) between the bridge member (5), the elongated hole (6) of the engaging protrusion (2), and the elongated hole (7) of the engaging recess (4). The fixing means (a) comprises a bridge member (5) and a locking member ( 8) , and the abutment portion of the bridge member (5 ) with the elongated hole (6) of the engaging protrusion (2) is formed as a single piece from an elastic synthetic resin body ( 52 ) on the flat side end portion of the block plate (51 ) by a molding method. A locking recess (53) is formed on the other end of the block plate (51). The locking member (8) is provided with an engaging protrusion (9) that engages with the locking recess (53) to integrally fix the tooth member (3) to the adapter member (1).
[0007]
[Embodiments of the Invention]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings, which are examples showing the effects of the embodiment.
[0008]
The engaging recess 4 of the tooth member 3 is fitted onto the mating protrusion 2 of the adapter member 1, the bridge member 5 is inserted into the elongated hole 6 formed in the engaging protrusion 2 of the adapter member 1, and the locking member 8 is hammered into the gap between the block plate body 51 of the bridge member 5, the elongated hole 6 formed in the adapter member 1 , and the elongated hole 7 formed in the engaging recess 4 of the tooth member 3. The engaging protrusion 9 of the locking member 8 moves over the block plate body 51 of the bridge member 5 while strongly compressing the elastic synthetic resin body 52 via the block plate body 51. When the engaging protrusion 9 fits into the engaging recess 53 , the locking member 8 strongly compresses the elastic synthetic resin body 51 of the bridge member 5, and the upper and lower ends of the locking member 8 strongly abut against the base of the elongated hole 7, firmly fixing the bridge member 5 and the locking member 9 together. The elastic restoring force of the elastic synthetic resin body 52 fixes the tooth member 3 together with the adapter member 1.
[0009]
During operation, the relative load acting between the adapter member 1 and tooth member 3 is supported by the upper and lower ends of the locking member 8 and the bridge member 5, and the load acting on the elastic synthetic resin body 52 is distributed evenly across the flat surface at the side end of the block plate body 51 and the long hole 6 of the engaging protrusion 2, so that even when a relative continuous repeated load is applied, the tooth member 3 remains firmly fixed to the adapter member 1 without peeling off and retains its restoring force.
[0010]
[Example]
The accompanying drawings illustrate an example of a preferred embodiment of the present invention. FIG. 1 is a perspective view illustrating the state of use of the present invention, FIGS. 2 and 3 are a first embodiment of the present invention, FIG. 4 is a second embodiment, and FIG. 5 is an explanatory diagram of the essential parts showing the engagement recess 39 of the bridge member 35 and lock member 38 of a conventional fixing means.
[0011]
The illustrated drawing shows a fixing means a consisting of a bridge member 5 and a locking member 8, in which the base of the adapter member 1 is fixed to the scooping position of the bucket body A by welding or other means, the engagement recess 4 of the tooth member 3 is fitted into the engagement protrusion 2 of the adapter member 1, which has a gentle rectangular truncated pyramid shape, the bridge member 5 is inserted into the long hole 6 provided in the engagement protrusion 2 via the long hole 7 of the tooth member 3, and a locking member 8 is driven between the bridge member 5, the long hole 6 of the engagement protrusion 2 and the long hole 7 of the engagement recess 4, and the adapter member 1 and tooth member 3 are fixed together.
[0012]
The contact portion of the engaging protrusion 2 of the bridge member 5 with the elongated hole 6 is formed integrally with an elastic synthetic resin body 52 on the flat side end portion of the block plate body 51 by molding, and a locking recess 53 is provided on the other side end of this block plate body 51. An engaging protrusion 9 is provided on the locking member 8 to engage with the locking recess 53 and fix the tooth member 3 integrally to the adapter member 1.
[0013]
The bridge member 5 shown is formed from a block plate 51 and an elastic synthetic resin body 52. One side end flat surface of the thick block plate 51 has an increased molding area for the elastic synthetic resin body 52 , a concave flat surface 54 carved when viewed from the side so that the elastic synthetic resin body 52 can be firmly molded to the block plate 51 , and the other side end surface has an engaging recess 53 as shown in Figure 3 that engages with the engaging protrusion 9 of the locking member 8. The high-hardness elastic synthetic resin body 52 is integrally molded into one side end surface of this block plate 51 by a molding method to form the bridge member 5. The upper and lower edges of the illustrated elastic synthetic resin body 52 are sloped downward toward the tips so that their upper and lower end faces engage with the upper and lower sides of the rectangular truncated pyramidal recess of the engaging recess 4, and the sloped surfaces come into contact with the upper and lower surfaces of the engaging recess 4 when the bridge member 5 is pressed by the locking member 8, firmly fixing the bridge member 5 to the engaging recess 4 .
[0014]
The locking member 8 made of a thick plate as shown in the figure is provided at its center with an engaging projection 9 which engages with the locking recess 53 of the bridge member 5.
[0015]
FIG. 4 shows a second embodiment of the present invention, in which semicircular plate-shaped locking projections 53 ' are provided in parallel with each other in the block plate body 51 of the bridge member 5 instead of the locking recesses 53 of the first embodiment, and the engaging portion of the locking member 8 that engages with these projections is formed in a semicircular concave shape, providing the same operational effects as the first embodiment.
[0016]
Since the embodiment of the present invention is configured as described above, when the engaging recess 4 of the tooth member 3 is fitted onto the engaging protrusion 2 of the adapter member 1, the bridge member 5 is inserted into the elongated hole 6 of the engaging protrusion 2, and the locking member 8 is hammered into the gap between the bridge member 5, the elongated hole 6 of the engaging protrusion 2, and the elongated hole 7 of the engaging recess 4, the engaging protrusion 9 of the locking member 8 moves over the block plate body 51 of the bridge member 5 while compressing the elastic synthetic resin body 52 , and when the engaging protrusion 9 fits into the engaging recess 53 , the bridge member 5 and the locking member 8 are locked together, and the tooth member 3 is firmly fixed to the adapter member 1 as a single unit due to the elastic restoring force of the elastic synthetic resin body 52 .
[0017]
During operation, the relative load acting between the adapter member 1 and the tooth member 3 is supported by the upper and lower ends of the lock member 8 and the bridge member 5, and the load acting on the elastic synthetic resin body 52 of the bridge member 5 is uniformly distributed over a plane by the flat surface of the side end of the block plate body 51 and the long hole 6 of the engaging protrusion 2. Therefore, even if a relative continuous repeated load is applied, the block plate body 51 and the elastic synthetic resin body 52 do not separate, the elastic restoring force of the elastic synthetic resin body 52 is maintained, and no rattle occurs and the function can be performed safely. Therefore, like the bridge member 35 of the conventional example in which a small cylindrical bridge roller body 351 is molded into the elastic synthetic resin body 352 , the bridge roller body 351 and the elastic synthetic resin body 35 2 peels off due to repeated contact stress, the elastic restoring force of bridge member 35 weakens and the force of bridge member 35 and locking member 38 fixing adapter member 1 and tooth member 3 together weakens, and repeated loads on adapter member 1 and tooth member 3 cause wear and play to occur at the fitting between adapter member 1 and tooth member 3, which causes tooth member 3 to fall off from adapter member 1, making this an excellent fixing means for fixing an adapter member and tooth member to be attached to the bucket body of a shovel machine.
[0018]
[Effects of the Invention]
As described above, in the present invention, the bridge member is formed as a single unit from elastic synthetic resin by molding onto the flat side end portion of the block plate, and a locking recess is provided on the other side end of the block plate. This locking member engages with this locking recess to integrally secure the tooth member to the adapter member, and an engaging protrusion is provided on the locking member. Therefore, the relative load that occurs between the adapter member and the tooth member during bucket operation is borne by the upper and lower ends of the locking member, the elongated hole in the tooth member, and the locking member and bridge member. The elastic synthetic resin body of the bridge member borne the evenly distributed load by the flat side end portion of the block plate and the elongated hole in the engaging protrusion. This prevents separation between the elastic synthetic resin body and the block plate, and maintains the restoring force of the elastic synthetic resin body. This provides a practical, economical and highly effective means for fastening the adapter member and tooth member to the bucket body of a shovel, which does not allow the tooth member to fall off the adapter member.
[Brief explanation of the drawings]
Figure 1
FIG. 1 is a perspective view showing a state in which the present invention is used.
Figure 2
FIG. 1 is an exploded perspective view of a first embodiment of the present invention.
Figure 3
FIG. 2 is a cross-sectional view of the main part.
Figure 4
FIG. 10 is a partially cutaway explanatory view of a main part of a second embodiment of the present invention.
Figure 5
FIG. 10 is an explanatory diagram showing a part of a main part of a conventional fixing means cut away.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 Adapter member 2 Engaging protrusion 3 Tooth member 4 Engaging protrusion 5 Bridge member 5 1 Block plate body 5 2 Elastic synthetic resin body 5 3 Locking recess 6 Slot 7 Slot 8 Lock member 9 Engaging protrusion a Fixing member A Bucket body