JPH0665521B2 - Ken Quote - Google Patents

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、自動車の車体下部に取り付けて用いるけん引
用フックの改良に関するものである。Description: TECHNICAL FIELD The present invention relates to an improvement of a towing hook which is used by being attached to a lower portion of a vehicle body of an automobile.

（従来の技術） けん引用フックは第２図に符号１により示したように自
動車の車体下部に取付けられ、他の車両をけん引する際
に、または他の車両によりけん引される際に、けん引ロ
ープを引っ掛けるためのものである。(Prior Art) A tow hook is attached to the lower part of the vehicle body of an automobile as indicated by reference numeral 1 in FIG. 2, and is used to tow another vehicle or tow it by another vehicle. It is for hooking.

従来のけん引用フックとしては第３図に示すもの（類似
構造は実公昭５８−２６５０号公報参照）、または第４
図（ａ），（ｂ）に示すもの（類似構造は実開昭５６−
１５５９０５号公報参照）が公知である。A conventional towing hook is shown in FIG. 3 (for a similar structure, refer to Japanese Utility Model Publication No. 58-2650), or the fourth one.
What is shown in Figures (a) and (b).
(See Japanese Patent No. 155905) is known.

第３図のけん引用フック１は成形鋼板製本体２と、これ
に溶接により固着したＵ字状棒部材から成るフック部３
とで構成され、成形鋼板製本体２は自動車の車体後部の
リヤサイドメンバ４およびリヤクロスメンバ５にそれぞ
れ適合する、ほぼ水平な底部６およびほぼ水平から垂直
へ直角に折れ曲がった形状のフランジ部７を有する。そ
してけん引用フック１は、取り付け孔８およびフランジ
部７の垂直壁に設けた取り付け孔９に、それぞれボルト
１０を挿通させてリヤサイドメンバ４およびリヤクロス
メンバ５に取り付けて実用する。The towed hook 1 shown in FIG. 3 comprises a body 2 made of a molded steel plate and a hook portion 3 composed of a U-shaped rod member fixed to the body 2 by welding.
The formed steel sheet main body 2 has a substantially horizontal bottom portion 6 and a flange portion 7 that is bent at a right angle from substantially horizontal to vertical, which are fitted to the rear side member 4 and the rear cross member 5 at the rear of the vehicle body of the automobile. Have. Then, the towing hook 1 is put into practical use by mounting the bolt 10 through the mounting hole 8 and the mounting hole 9 provided in the vertical wall of the flange portion 7 and mounting it on the rear side member 4 and the rear cross member 5, respectively.

また第４図（ａ），（ｂ）のけん引用フック１は、下向
きのほぼコ字状断面形状を有する本体２の下端にフック
部３を溶着して構成し、本体２に穿設した２個の取り付
け孔１１，１２により車体後部のリヤサイドメンバにボ
ルト止めして実用する。Further, the towing hook 1 shown in FIGS. 4 (a) and 4 (b) is formed by welding the hook portion 3 to the lower end of the main body 2 having a downwardly facing U-shaped cross section, and the hook 2 is provided in the main body 2. It is put into practice by bolting it to the rear side member at the rear of the vehicle body through the individual mounting holes 11 and 12.

（発明が解決しようとする課題） しかしながらこのような従来のけん引用フックにおい
て、第３図のものはリヤサイドメンバを下から囲む構造
としているため成形が複雑であり、本体の展開面積も大
きく、重量、材料費および製造コストの増大を招いてお
り、また第４図（ａ），（ｂ）に示したものは２点止め
であるので横方向入力に対し取付部の剛性強度を十分に
確保し難いという問題点を有していた。(Problems to be Solved by the Invention) However, in such a conventional towing hook, the one shown in FIG. 3 has a complicated structure because the rear side member is surrounded from below, and the main body has a large deployment area and a large weight. In addition, the material cost and the manufacturing cost are increased, and the one shown in FIGS. 4 (a) and 4 (b) is a two-point stopper, so that the rigidity of the mounting portion is sufficiently secured against lateral input. It had a problem that it was difficult.

本発明は、これらの問題を全て解消したけん引用フック
を提供することを目的とする。An object of the present invention is to provide a towing hook that solves all of these problems.

（課題を解決するための手段） この目的のため本発明は、成形鋼板で造った本体と、Ｕ
字状棒部材からなるフック部とを具え、該フック部を成
すＵ字状棒部材の両脚部を、該棒部材のＵ字状部が本体
から突出するよう、該本体に固着して構成し、前記本体
を少なくと３点で車体にねじ止めして実用するけん引用
フックにおいて、 前記Ｕ字状部に近い前記本体の一方の端部は、前記棒部
材の両脚部を載置させる底壁と、該底壁の両側に連なり
前記棒部材の両脚部を互いに遠い側において受け止める
側壁と、これら側壁に連なるフランジ部とよりなる断面
Ω字状にすると共に、該フランジ部にそれぞれ前記ねじ
止めのための取り付け孔を形成し、 前記Ｕ字状部から遠い前記本体の他方の端部は、前記フ
ランジ部と略同一面内に位置する底壁と、該底壁の両側
に連なり前記棒部材の両脚部を互いに向かい合う側にお
いて受け止める側壁と、これら側壁に連なって前記棒部
材の両脚部を載置させるフランジ部とよりなる断面逆Ω
字状にすると共に、前記底壁を前記ねじ止めのための取
り付け孔を形成し、 前記本体の断面Ω字状にした一方の端部および断面逆Ω
字状にした他方の端部間に、これら端部における底壁同
士およびフランジ部同士を滑らかに連続させるための傾
斜部を設けたことを特徴とするものである。(Means for Solving the Problem) For this purpose, the present invention provides a body made of a formed steel sheet and a U
A hook portion formed of a U-shaped rod member, wherein both legs of the U-shaped rod member forming the hook portion are fixed to the main body so that the U-shaped portion of the rod member projects from the main body. In a towing hook for practical use in which the main body is screwed to a vehicle body at least at three points, one end of the main body near the U-shaped portion has a bottom wall on which both legs of the rod member are placed. And a side wall connected to both sides of the bottom wall for receiving both legs of the rod member on the side far from each other, and a flange section connected to these side walls, and the section has an Ω shape, and the flange section is provided with the screws. And a bottom wall positioned substantially in the same plane as the flange portion, and the other end portion of the main body that is far from the U-shaped portion, and is connected to both sides of the bottom wall. Side walls that receive both legs on opposite sides And a cross-sectional reverse Ω consisting of a flange portion which is connected to these side walls and on which both leg portions of the rod member are placed.
In addition to forming a letter shape, a mounting hole for screwing the bottom wall is formed, and one end of the main body having a cross section of Ω shape and a cross section having an inverse cross section of Ω.
It is characterized in that an inclined portion for smoothly connecting the bottom walls and the flange portions at these ends is provided between the other ends of the character shape.

（作用） かかる本発明のけん引用フックによれば、第３図のもの
より形成が容易であり、又本体の展開面積を小さくしつ
つ強固な３点止めが可能であり、重量、材料費、製造コ
ストの低減を図り得る。加えて、フック部の両脚部を外
側と内側から挟持した状態で本体に固着するため、フッ
ク部の固着箇所に加わる加重負担が軽くなり、耐久性の
点でも有利である。(Function) According to the tow hook of the present invention, it is easier to form than the hook shown in FIG. 3, and a strong three-point stop is possible while reducing the development area of the main body. The manufacturing cost can be reduced. In addition, since both legs of the hook portion are fixed to the main body in a state of being clamped from the outside and the inside, the load applied to the fixing portion of the hook portion is lightened, which is also advantageous in terms of durability.

（実施例） 以下本発明の実施例を図面に基づき詳述する。(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

第１図（ａ）〜（ｃ）は本発明のけん引用フックの一実
施例を示す。本例のけん引用フック１は鋼板をプレス成
形して造った本体２と、この本体２に溶接により固着し
たＵ字状棒部材から成るフック部３とで構成する。1 (a) to 1 (c) show one embodiment of the towing hook of the present invention. The towing hook 1 of this example is composed of a main body 2 made by press forming a steel plate and a hook portion 3 made of a U-shaped rod member fixed to the main body 2 by welding.

ここで、フック部３を本体２に溶接するに当たっては、
該フック部を成すＵ字状棒部材の両脚部３ａを、該棒部
材のＵ字状部３ｂが本体２から突出するよう、該本体に
溶接する。Here, when welding the hook portion 3 to the main body 2,
Both legs 3a of the U-shaped rod member forming the hook portion are welded to the main body so that the U-shaped portions 3b of the rod member protrude from the main body 2.

そして、フック部３のＵ字状部３ｂに近い本体２の一方
の端部２ａは断面Ω字状とし、この断面形状は、フック
部３の両脚部３ａを載置させる底壁１１と、該底壁の両
側に、これに対し直角方向に延在するよう連なる側壁１
２と、これら側壁に、これらに対し直角方向に延在する
よう連なるフランジ部１３とで画成する。なお側壁１２
は、フック部３の両脚部３ａを互いに遠い側において受
け止めるものとし、各フランジ部１３には、車体に対す
るねじ止めのための取り付け孔１４を穿設する。One end 2a of the main body 2 near the U-shaped portion 3b of the hook portion 3 has an Ω-shaped cross section, and this cross-sectional shape includes a bottom wall 11 on which both legs 3a of the hook portion 3 are placed, Side walls 1 connected to both sides of the bottom wall so as to extend in a direction perpendicular thereto
2 and a flange portion 13 connected to these side walls so as to extend in a direction perpendicular to them. The side wall 12
Is to receive both leg portions 3a of the hook portion 3 on the side distant from each other, and each flange portion 13 is provided with a mounting hole 14 for screwing to the vehicle body.

他方、フック部３のＵ字状部３ｂから遠い本体２の他方
の端部２ｂは断面逆Ω字状とし、この断面形状は、上記
フランジ部１１と略同一面内に位置する底壁１５と、該
底壁の両側に、これに対し直角方向に延在するよう連な
って、フック部３の両脚部３ａを互いに向かい合う側に
おいて受け止める側壁１６と、これら側壁に、これらに
対し直角方向に延在するよう連なるフランジ部１７とで
画成する。なおフランジ部１７は、フック部３の両脚部
３ａを載置させるもので、従って同じくフック部３の両
脚部３ａを載置させる底壁１１と略同一面内に位置さ
せ、底壁１５には、車体に対するねじ止めのための取り
付け孔１４を穿設する 本体２の断面Ω状にした一方の端部２ａおよび断面逆Ω
字状にした他方の端部２ｂ間には、これら端部における
底壁１１，１５同士およびフランジ部１３，１７同士を
滑らかに連続させるための傾斜部１９，２０を設ける。On the other hand, the other end 2b of the main body 2 far from the U-shaped portion 3b of the hook portion 3 has an inverted Ω-shaped cross section, and this cross-sectional shape is the same as that of the bottom wall 15 located substantially in the same plane as the flange portion 11. , Side walls 16 that are connected to both sides of the bottom wall so as to extend in a direction perpendicular to the side walls, and that receive the leg portions 3a of the hook portion 3 on opposite sides, and side walls 16 that extend in a direction perpendicular to these side walls. It is defined by the flange portion 17 which is continuous. The flange portion 17 is for placing both leg portions 3a of the hook portion 3, and therefore is located substantially in the same plane as the bottom wall 11 on which the both leg portions 3a of the hook portion 3 are placed, and the flange portion 17 is , A mounting hole 14 for screwing to the vehicle body is formed. One end 2a of the body 2 having a cross section of Ω and a cross section of reverse Ω.
Between the other ends 2b in the shape of a letter, slopes 19 and 20 are provided for smoothly connecting the bottom walls 11 and 15 and the flanges 13 and 17 at these ends.

フック部３を本体２に溶接するに当っては、第１図
（ｂ），（ｃ）にＷで明示するように、該フック部３の
両脚部３ａを底壁１１、側壁１２，１６、及びフランジ
部１７に溶接する。When welding the hook portion 3 to the main body 2, as shown by W in FIGS. 1 (b) and 1 (c), both leg portions 3a of the hook portion 3 are connected to the bottom wall 11, the side walls 12 and 16, And weld to the flange portion 17.

上記した本例のけん引用フックは、第３図に示した従来
のけん引用フックのように車体のリヤサイドメンバを下
から囲むのではなく、車体の平面的な取り付け面に本体
２を当てがって、取り付け孔１４，１８に挿通したねじ
により車体に取り付ける構成故に、本体２の成形が簡単
であると共に、その展開面積を小さくしつつ強固な３点
止めが可能になり、重量，材料費および製造コストを大
幅に節減することができる。The above-described towing hook of this example does not surround the rear side member of the vehicle body from below like the conventional towing hook shown in FIG. 3, but the main body 2 is applied to the plane mounting surface of the vehicle body. The main body 2 can be molded easily because of the structure in which it is mounted on the vehicle body by the screws inserted into the mounting holes 14 and 18, and the development area can be reduced and a strong three-point stop can be achieved. Manufacturing costs can be significantly reduced.

また、側壁１２がフック部３の両脚部３ａを互いに遠い
側において受け止め、側壁１６がフック部３の両脚部３
ａを互いに向かい合う側において受け止めるというよう
に、フック部３の両脚部３ａを夫々、両側から挟持する
ことから、フック部３に側方への応力が作用した場合で
も、溶接部Ｗにかかる荷重負担が小さく、その分溶接長
さを短縮することができ、この点でも製造コストを軽減
することができる。Further, the side wall 12 receives the both leg portions 3a of the hook portion 3 on the side distant from each other, and the side wall 16 receives the both leg portions 3 of the hook portion 3.
Since both legs 3a of the hook portion 3 are clamped from both sides such that the hook portions 3a are received on the sides facing each other, even if a lateral stress is applied to the hook portion 3, a load load on the welded portion W is exerted. Is small, and the welding length can be shortened accordingly, and the manufacturing cost can be reduced in this respect as well.

なお、本体２の端部２ａおよび端部２ｂ間に、これら両
端部における底壁１１，１５同士およびフランジ部１
３，１７同士を滑らかに連続させるための傾斜部１９，
２０を設けた本例の構成では、これら傾斜部に連なる側
壁１２，１６の部分が相互に対向することとなって、該
対向側壁部分間にフック部３の両脚部３ａが強固に挟持
されることから、上記の作用効果を一層顕著なものにす
ることができる。In addition, between the end portions 2a and 2b of the main body 2, the bottom walls 11 and 15 at these end portions and the flange portion 1 are provided.
Sloped portions 19 for smoothly connecting 3 and 17 with each other,
In the configuration of this example in which 20 is provided, the portions of the side walls 12 and 16 connected to these inclined portions face each other, so that both legs 3a of the hook portion 3 are firmly sandwiched between the facing side wall portions. Therefore, the above-mentioned effects can be made more remarkable.

（発明の効果） かくして本発明のけん引用フックは上述の如く、 成形鋼板で造った本体２と、Ｕ字状棒部材からなるフッ
ク部３とを具え、このフック部を成すＵ字状棒部材の両
脚部３ａを、該棒部材のＵ字状部３ｂが本体２から突出
するよう、該本体に固着して構成し、本体２を少なくと
も３点で車体にねじ止めして実用するけん引用フックに
おいて、 Ｕ字状部３ｂに近い本体２の一方の端部２ａは、上記棒
部材の両脚部３ａを載置させる底壁１１と、該底壁の両
側に連なり上記棒部材の両脚部３ａを互いに遠い側にお
いて受け止める側壁１２と、これら側壁に連なるフラン
ジ部１３とよりなる断面Ω字状にすると共に、該フラン
ジ部にそれぞれ上記ねじ止めのための取り付け孔１４を
形成し、 Ｕ字状部３ｂから遠い本体２の他方の端部２ｂは、上記
フランジ部１３と略同一面内に位置する底壁１５と、該
底壁の両側に連なり上記棒部材の両脚部３ａを互いに向
かい合う側において受け止める側壁１６と、これら側壁
に連なって上記棒部材の両脚部３ａを載置させるフラン
ジ部１７とよりなる断面逆Ω字状にすると共に、上記底
壁１５に上記ねじ止めのための取り付け孔１８を形成
し、 本体２の断面Ω字状にした一方の端部２ａおよび断面逆
Ω字状にした他方の端部２ｂ間に、これら端部における
底壁１１，１５同士およびフランジ部１３，１７同士を
滑らかに連続させるための傾斜部１９，２０を設けた構
成になるから、 本体２の成形が簡単であると共に、その展開面積を小さ
くしつつ強固な３点止めが可能になり、重量、材料費お
よび製造コストを大幅に節減することができる。(Effects of the Invention) Thus, as described above, the towing hook of the present invention comprises the main body 2 made of the formed steel sheet and the hook portion 3 made of the U-shaped rod member, and the U-shaped rod member forming the hook portion. Both legs 3a of the rod member are fixed to the body so that the U-shaped portion 3b of the rod member projects from the body 2, and the body 2 is screwed to the vehicle body at at least three points for practical use. At one end 2a of the main body 2 close to the U-shaped portion 3b, the bottom wall 11 on which both the leg portions 3a of the rod member are placed and the both leg portions 3a of the rod member connected to both sides of the bottom wall are connected. The side walls 12 that are distant from each other and the flange portions 13 connected to these side walls are formed into an Ω-shaped cross section, and mounting holes 14 for screwing are formed in the flange portions, respectively, and the U-shaped portion 3b is formed. The other end 2 of the body 2 remote from the Is a bottom wall 15 located substantially in the same plane as the flange portion 13, side walls 16 connected to both sides of the bottom wall and for receiving the leg portions 3a of the rod member on opposite sides, and the rod connected to these side walls. The cross section of the main body 2 is formed in the shape of an inverted Ω, which is composed of the flange portion 17 on which the both leg portions 3a of the member are placed, and the mounting hole 18 for fixing the screw is formed in the bottom wall 15. Between the one end 2a formed and the other end 2b having an inverted Ω-shaped cross section, the inclined portions 19 for smoothly connecting the bottom walls 11 and 15 and the flanges 13 and 17 at these ends, Since the structure in which the body 20 is provided is simple, the body 2 can be easily molded, and the development area can be reduced, and a strong three-point stop can be achieved, which can significantly reduce weight, material cost, and manufacturing cost. it can .

また、フック部３の両脚部３ａを夫々、側壁１２，１６
により両側から挟持することから、フック部３に側方へ
の応力が作用した場合でも、フック部３と本体２との固
着Ｗにかかる荷重負担が小さく、その分、固着加工（図
示例では溶接Ｗ）の長さを短縮することができ、この点
でも製造コストを軽減することができる。Also, the leg portions 3a of the hook portion 3 are respectively attached to the side walls 12, 16
Since it is clamped from both sides by the above, even if a lateral stress is applied to the hook portion 3, the load burden on the fixing W between the hook portion 3 and the main body 2 is small, and the fixing process (welding in the illustrated example) is correspondingly performed. The length W) can be shortened, and the manufacturing cost can be reduced in this respect as well.

更に、本体２の端部２ａおよび端部２ｂ間に、これら両
端部における底壁１１，１５同士およびフランジ部１
３，１７同士を滑らかに連続させるための傾斜部１９，
２０を設けたことから、これら傾斜部に連なる側壁１
２，１６の部分が相互に対向することとなって、該対向
側壁部分間にフック部３の両脚部３ａが強固に挟持され
ることで、上記の作用効果を一層顕著なものにすること
ができる。Furthermore, between the end portions 2a and 2b of the main body 2, the bottom walls 11 and 15 at the both end portions and the flange portion 1 are provided.
Sloped portions 19 for smoothly connecting 3 and 17 with each other,
Since 20 is provided, the side wall 1 connected to these inclined portions
The portions 2 and 16 are opposed to each other, and the leg portions 3a of the hook portion 3 are firmly sandwiched between the opposed side wall portions, so that the above action and effect can be made more remarkable. it can.

【図面の簡単な説明】[Brief description of drawings]

第１図（ａ）は本発明によるけん引用フックの一実施例
の構成を示す斜視図、 同図（ｂ）は（ａ）のＡ−Ａ線上より矢の方向に見た断
面図、 同図（ｃ）は（ａ）のＢ−Ｂ線上より矢の方向に見た断
面図、 第２図は自動車の車体後部に対するけん引用フックの装
着例を示す斜視図、 第３図は従来のけん引用フックの一例を示す斜視図、 第４図（ａ）は従来のけん引用フックの一例を示す斜視
図、 同図（ｂ）は（ａ）のＣ−Ｃ線上より矢の方向に見た断
面図である。 １……けん引用フック、２……鋼板製本体 ２ａ……一方の端部、２ｂ……他方の端部 ３……フック部、３ａ……脚部 ３ｂ……Ｕ字状部、１１……底壁 １２……側壁、１３……フランジ部 １４……取り付け孔、１５……底壁 １６……側壁、１７……フランジ部 １８……取り付け孔、１９，２０……傾斜部FIG. 1 (a) is a perspective view showing the configuration of an embodiment of a towing hook according to the present invention, and FIG. 1 (b) is a sectional view taken along the line AA of FIG. (C) is a cross-sectional view as seen in the direction of the arrow from the line BB of (a), FIG. 2 is a perspective view showing an example of attaching a towing hook to the rear part of the vehicle body of an automobile, and FIG. FIG. 4 (a) is a perspective view showing an example of a conventional towing hook, and FIG. 4 (b) is a cross-sectional view seen in the direction of the arrow on line CC in FIG. 4 (a). Is. 1 ... Towing hook, 2 ... Steel plate body 2a ... One end, 2b ... Other end 3 ... Hook part, 3a ... Leg part 3b ... U-shaped part, 11 ... Bottom wall 12 ... Side wall, 13 ... Flange portion 14 ... Mounting hole, 15 ... Bottom wall 16 ... Side wall, 17 ... Flange portion 18 ... Mounting hole, 19, 20 ... Inclined portion

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】成形鋼板で造った本体（２）と、Ｕ字状棒
部材からなるフック部（３）とを具え、該フック部を成
すＵ字状棒部材の両脚部（３ａ）を、該棒部材のＵ字状
部（３ｂ）が本体（２）から突出するよう、該本体に固
着して構成し、前記本体を少なくとも３点で車体にねじ
止めして実用するけん引用フックにおいて、 前記Ｕ字状部（３ｂ）に近い前記本体（２）の一方の端
部（２ａ）は、前記棒部材の両脚部（３ａ）を載置させ
る底壁（１１）と、該底壁の両側に連なり前記棒部材の
両脚部（３ａ）を互いに遠い側において受け止める側壁
（１２）と、これら側壁に連なるフランジ部（１３）と
よりなる断面Ω字状にすると共に、該フランジ部にそれ
ぞれ前記ねじ止めのための取り付け孔（１４）を形成
し、 前記Ｕ字状部（３ｂ）から遠い前記本体（２）の他方の
端部（２ｂ）は、前記フランジ部（１３）と略同一面内
に位置する底壁（１５）と、該底壁の両側に連なり前記
棒部材の両脚部（３ａ）を互いに向かい合う側において
受け止める側壁（１６）と、これら側壁に連なって前記
棒部材の両脚部（３ａ）を載置させるフランジ部（１
７）とよりなる断面逆Ω字状にすると共に、前記底壁
（１５）に前記ねじ止めのための取り付け孔（１８）を
形成し、 前記本体（２）の断面Ω字状にした一方の端部（２ａ）
および断面逆Ω字状にした他方の端部（２ｂ）間に、こ
れら端部（２ａ），（２ｂ）における底壁（１１，１
５）同士およびフランジ部（１３，１７）同士を滑らか
に連続させるための傾斜部（１９，２０）を設けたこと
を特徴とするけん引用フック。1. A main body (2) made of a formed steel sheet and a hook portion (3) made of a U-shaped rod member, and both legs (3a) of the U-shaped rod member forming the hook portion, In a towing hook for practical use, wherein the U-shaped portion (3b) of the rod member is fixed to the main body (2) so as to project from the main body (2), and the main body is screwed to the vehicle body at at least three points. One end portion (2a) of the body (2) near the U-shaped portion (3b) has a bottom wall (11) on which both leg portions (3a) of the rod member are placed, and both sides of the bottom wall (11). And a side wall (12) for receiving both legs (3a) of the rod member on the side farther from each other and a flange (13) continuous to these side walls, and having a cross section of Ω shape, and the flanges are respectively provided with the screw. A mounting hole (14) for stopping is formed, and from the U-shaped portion (3b) The other end (2b) of the distant main body (2) is connected to the bottom wall (15) located substantially in the same plane as the flange part (13), and is connected to both sides of the bottom wall, and both legs of the rod member are connected. Side walls (16) that receive (3a) on opposite sides, and a flange portion (1) on which both leg portions (3a) of the rod member are mounted in a continuous manner with these side walls.
7) and an inverted Ω-shaped cross section, and the bottom wall (15) is provided with a mounting hole (18) for screwing, so that the main body (2) has an Ω-shaped cross section. Edge (2a)
And the bottom wall (11, 1) at these end portions (2a), (2b) between the other end portions (2b) having a reverse Ω-shaped cross section.
5) A towing hook which is provided with an inclined portion (19, 20) for smoothly connecting the flange portions (13, 17) with each other.