JP2010070902A - Method of manufacturing grating - Google Patents

Method of manufacturing grating Download PDF

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JP2010070902A
JP2010070902A JP2008235831A JP2008235831A JP2010070902A JP 2010070902 A JP2010070902 A JP 2010070902A JP 2008235831 A JP2008235831 A JP 2008235831A JP 2008235831 A JP2008235831 A JP 2008235831A JP 2010070902 A JP2010070902 A JP 2010070902A
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bar
fitting
bars
main
grating
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JP5383130B2 (en
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Junji Kitagawa
淳二 北川
Susumu Kawamura
進 川村
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Daiken Co Ltd
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Daiken Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a grating, which enables a main bar and a side bar to be surely fixed together. <P>SOLUTION: This method of manufacturing the grating includes a step of caulking a leading end of a fitting portion 7, which protrudes slightly outward from a connecting hole portion 5, in the state of fitting the fitting portion 7 at the end of the main bar 3 into the connecting hole portion 5 of the side bar 2, by means of a caulking mold 11 in which two upper and lower claw portions 10 are provided toward an end surface of the fitting portion 7 from the outer surface side of the side bar 2. The upside claw portion 10 of the two upper and lower claw portions 10 has a leading end sharpened so that a top surface can be inclined toward the leading end and so that an undersurface can become horizontal; the downside claw portion 10 has a leading end sharpened so that an undersurface can be inclined toward the leading end and so that a top surface can become horizontal; and the end surface of the fitting portion 7, which is caulked by the caulking mold 11 equipped with the two claw portions 10, has the vicinities of both upper and lower ends scooped out, and is deformed in the state of protruding upward in an upper portion and protruding downward in a lower portion, so as to be locked to the outer surface of the side bar 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、例えば道路の側溝の上に被さるように配設して使用されるグレーチングの製造方法に関するものである。   The present invention relates to a manufacturing method of a grating used by being disposed so as to be covered on a side groove of a road, for example.

従来のこの種グレーチングとしては例えば特許文献１に開示されているものが知られている。この特許文献１に開示されているグレーチングは、互いに対面して長さ方向に平行に延在する一対のエンドバーと、該両エンドバー間で各々対面しつつ該両エンドバーと直角方向に延在し、両端が該各エンドバーに所定ピッチで固定された複数本のベアリングバーとを備えたグレーチングにおいて、前記両エンドバーは前記ピッチに応じて貫設された嵌合穴をもち、前記各ベアリングバーの両端には、該エンドバーの内面と当接する当接面と、該当接面から突出して該嵌合穴に嵌合する嵌合部と、該嵌合部から突出し、該エンドバーの外面側からかしめられて該ベアリングバーを該エンドバーに固定する凸部とが形成されている。
特許第３８２４２６３号公報 As this type of conventional grating, for example, one disclosed in Patent Document 1 is known. The grating disclosed in Patent Document 1 is a pair of end bars facing each other and extending in parallel in the length direction, and extending in a direction perpendicular to the both end bars while facing each other between the both end bars. In a grating having a plurality of bearing bars each having both ends fixed to each end bar at a predetermined pitch, the both end bars have fitting holes penetrating according to the pitch, and are provided at both ends of each bearing bar. A contact surface that contacts the inner surface of the end bar, a fitting portion that protrudes from the corresponding contact surface and fits into the fitting hole, protrudes from the fitting portion, and is caulked from the outer surface side of the end bar. A convex portion for fixing the bearing bar to the end bar is formed.
Japanese Patent No. 3824263

上記特許文献１に開示されているベアリングバーでは、嵌合穴に嵌合する嵌合部から突出する凸部は嵌合部の両端側に先端が丸みを帯びた状態で形成されており、凸部をエンドバーの外面側からかしめたときに凸部が嵌合穴の外周縁より外側に突出するように押し潰されたときは押し潰された凸部によってベアリングバーにエンドバーを固定することができるが、凸部が嵌合穴の外周縁より外側に突出しないよう押し潰されることもあり、その場合はベアリングバーとエンドバーとの固定が完全ではなく、製品不良になり、組み立て安定性に欠けるという問題があった。   In the bearing bar disclosed in Patent Document 1, the protrusions protruding from the fitting portion that fits into the fitting hole are formed with rounded ends on both ends of the fitting portion. When the convex portion is squeezed from the outer surface side of the end bar so that the convex portion protrudes outward from the outer peripheral edge of the fitting hole, the end bar can be fixed to the bearing bar by the crushed convex portion. However, it may be crushed so that the convex part does not protrude outward from the outer peripheral edge of the fitting hole. In that case, the bearing bar and the end bar are not completely fixed, resulting in a defective product and lack of assembly stability. There was a problem.

本発明の目的は、このような課題を解決するものであり、メインバー（ベアリングバー）とサイドバー（エンドバー）との固定を確実に行なえるようにしたグレーチングの製造方法を提供することにある。   An object of the present invention is to solve such a problem, and to provide a manufacturing method of a grating capable of surely fixing a main bar (bearing bar) and a side bar (end bar). .

本発明の請求項１に記載のグレーチングの製造方法は、互いに平行な一対のサイドバーと、この一対のサイドバー間に位置しこの一対のサイドバーに対して直角方向に向き等間隔おきに配列される多数本のメインバーとを備え、等間隔おきに縦向きの長孔状に形成されたサイドバーの結合孔部にメインバーの両端部においてメインバーの上下に向く幅方向の中間部に形成された嵌合部を嵌合させ、サイドバーの外面側よりかしめられてメインバーをサイドバーに固定するようにしたグレーチングの製造方法であって、メインバーの端部の嵌合部をサイドバーの結合孔部に嵌合させた状態で、結合孔部から僅かに外方に突出する嵌合部の先端をサイドバーの外面側より嵌合部の端面に向って上下に２つの爪部を備えたかしめ用型でかしめる工程を含み、前記上下２つの爪部の内、上側の爪部は上面が先端に向って傾斜し且つ下面が水平となるように先端が尖っており、下側の爪部は下面が先端に向って傾斜し且つ上面が水平となるように先端が尖っており、この２つの爪部を備えたかしめ用型によりかしめられた嵌合部の端面は上下の両端近傍が抉られて上部では上側に、下部では下側に飛び出すように変形してサイドバーの外面に係止するようにしたことを特徴とする。   A manufacturing method of a grating according to claim 1 of the present invention includes a pair of side bars that are parallel to each other, and are arranged between the pair of side bars and arranged at equal intervals in a direction perpendicular to the pair of side bars. A plurality of main bars that are connected to each other, and are connected to the connecting holes of the side bars that are formed in the shape of vertically elongated slots at equal intervals. A manufacturing method of a grating in which a formed fitting portion is fitted and caulked from the outer surface side of the side bar to fix the main bar to the side bar, the fitting portion at the end of the main bar being a side In the state of being fitted into the coupling hole of the bar, the two claw parts are vertically moved from the outer surface side of the side bar toward the end surface of the fitting part with the tip of the fitting part protruding slightly outward from the coupling hole. Caulking with a caulking mold Of the upper and lower two claw portions, the upper claw portion has an upper surface inclined toward the tip and the lower surface is pointed so that the lower surface is horizontal, and the lower claw portion has a lower surface directed toward the tip. The tip of the fitting part is inclined so that it is inclined and the upper surface is horizontal, and the end face of the fitting part that is caulked by the caulking die provided with the two claws is squeezed near the upper and lower ends, and the upper part is on the upper side, The lower part is characterized in that it is deformed so as to protrude downward and is locked to the outer surface of the side bar.

以上のように、本発明のグレーチングの製造方法によれば、メインバーをサイドバーに固定するために、サイドバーの結合孔部に嵌合するメインバーの端部の嵌合部にかしめ用の小さな凸部を形成する必要がなく、かしめ用型に爪部を備えておくことにより、嵌合部の端面を抉るように変形させてサイドバーの外面に係止させることができる。また、かしめ用型の上下２つの爪部の内、上側の爪部は上面が先端に向って傾斜し且つ下面が水平となるように先端が尖っており、下側の爪部は下面が先端に向って傾斜し且つ上面が水平となるように先端が尖っているので、この２つの爪部を備えたかしめ用型によりかしめられた嵌合部の端面は上下の両端近傍が抉られて上部では上側に、下部では下側に飛び出すように確実に変形し、上下のかしめ部は結合孔部の上下でサイドバーの外面に係止することになる。   As described above, according to the manufacturing method of the grating of the present invention, in order to fix the main bar to the side bar, it is caulked to the fitting portion at the end portion of the main bar that fits into the coupling hole portion of the side bar. There is no need to form a small convex portion, and by providing the claw portion with the caulking die, the end surface of the fitting portion can be deformed so as to be locked to the outer surface of the side bar. Of the two upper and lower claws of the caulking mold, the upper claw has a sharp tip so that the upper surface is inclined toward the tip and the lower surface is horizontal, and the lower claw has a lower surface at the tip. Since the tip is sharp so that the top surface is horizontal and the top surface is horizontal, the end surface of the fitting portion caulked by the caulking die provided with these two claws is squeezed near the upper and lower ends. In this case, the upper and lower caulking portions are locked to the outer surface of the side bar above and below the coupling hole portion.

以下、本発明の一実施の形態を、図１〜図９を用いて具体的に説明する。
図において、１はステンレスを材料に用いて作られる周囲４辺のサイドバー２と、互いに平行な一対のサイドバー２間に位置しこの一対のサイドバー２に対して直角方向に向き等間隔おきに配列される多数本のＩ型のメインバー３と、前記一対のサイドバー２間においてこの一対のサイドバー２と平行に位置し前記メインバー３と結合されるクロスバー４とからなるグレーチングである。そして、前記サイドバー２、メインバー３、クロスバー４はそれぞれ板状を呈している。グレーチング１は平面形状が長方形を呈し、長辺側に位置する前記一対のサイドバー２には等間隔おきに前記メインバー３との結合孔部５が形成されている。各結合孔部５は縦向きの長孔状となっており、この結合孔部５にメインバー３の長さ方向の端部が嵌合し、結合孔部５から突出するメインバー３の長さ方向の端部をかしめることによりサイドバー２にメインバー３が結合してグレーチング１が組み立てられるようになっている。 Hereinafter, an embodiment of the present invention will be specifically described with reference to FIGS.
In the figure, reference numeral 1 denotes a peripheral side bar 2 made of stainless steel as a material, and a pair of side bars 2 that are parallel to each other and located at equal intervals in a direction perpendicular to the pair of side bars 2. The grating is composed of a large number of I-type main bars 3 arranged in parallel to each other and a cross bar 4 positioned between the pair of side bars 2 in parallel with the pair of side bars 2 and coupled to the main bar 3. is there. The side bar 2, the main bar 3, and the cross bar 4 each have a plate shape. The grating 1 has a rectangular planar shape, and the pair of side bars 2 located on the long side are formed with coupling holes 5 with the main bar 3 at equal intervals. Each coupling hole 5 is in the shape of a vertically long slot, and the end of the main bar 3 in the length direction is fitted into the coupling hole 5, and the length of the main bar 3 protruding from the coupling hole 5. The main bar 3 is joined to the side bar 2 by caulking the end in the vertical direction so that the grating 1 is assembled.

また、サイドバー２の外面は上下が長さ方向に沿って外側に膨らんでおり、結合孔部５が形成されている部分もサイドバー２の上下端部より僅かに薄肉状となっており、結合孔部５が形成されている部分の上下もサイドバー２の上下端部より僅かに薄肉状となっていて、その外面は上下端部よりも凹入している。６はこの凹入部である。   In addition, the outer surface of the side bar 2 is bulging outward along the length direction, and the portion where the coupling hole 5 is formed is also slightly thinner than the upper and lower ends of the side bar 2, The upper and lower portions of the portion where the coupling hole portion 5 is formed are also slightly thinner than the upper and lower end portions of the side bar 2, and the outer surfaces thereof are recessed more than the upper and lower end portions. 6 is this recessed part.

また、前記メインバー３の両端部にはメインバー３の上下に向く幅方向の中間部に前記結合孔部５への嵌合部７が形成されている。この嵌合部７は前記結合孔部５から僅かに突出し端面がフラットな状態に形成されている。そして、嵌合部７の付け根部において付け根部から上下に繋がるメインバー３の上下の端面３ａ，３ａは上下方向に向き、嵌合部７をサイドバー２の結合孔部５に嵌合させた状態においてメインバー３の前記上下の端面３ａ，３ａはサイドバー２の内面に面で当接するように構成されている。   Further, at both ends of the main bar 3, fitting portions 7 to the coupling hole 5 are formed at intermediate portions in the width direction facing the top and bottom of the main bar 3. The fitting portion 7 slightly protrudes from the coupling hole portion 5 and is formed in a flat end surface. And in the base part of the fitting part 7, the upper and lower end surfaces 3a and 3a of the main bar 3 connected up and down from the base part are directed in the vertical direction, and the fitting part 7 is fitted into the coupling hole part 5 of the side bar 2. In the state, the upper and lower end surfaces 3a, 3a of the main bar 3 are configured to come into contact with the inner surface of the side bar 2 by their surfaces.

さらに、前記各メインバー３の長さ方向中央部には、クロスバー４との係合孔部８が形成されている。この係合孔部８はメインバー３の長さ方向に向くように横長に形成されており、そしてこの係合孔部８の中央部がメインバー３との係合部８ａとなるように形成されている。一方、クロスバー４には各メインバー３との係合位置で上下に係合溝９が形成されており、クロスバー４を水平に向けてメインバー３の係合孔部８に差し込み、かかる状態でクロスバー４を捩るように回転させることにより係合孔部８の中央部の係合部８ａに係合溝９が係合してクロスバー４がメインバー３に係合するように構成されている。   Furthermore, an engagement hole 8 with the cross bar 4 is formed at the center in the length direction of each main bar 3. The engagement hole portion 8 is formed in a horizontally long shape so as to face the length direction of the main bar 3, and the center portion of the engagement hole portion 8 is formed as an engagement portion 8 a with the main bar 3. Has been. On the other hand, the cross bar 4 is formed with an engagement groove 9 in the vertical direction at the position of engagement with each main bar 3, and is inserted into the engagement hole 8 of the main bar 3 with the cross bar 4 facing horizontally. In this state, the cross bar 4 is rotated so as to be twisted so that the engagement groove 9 is engaged with the engagement portion 8a at the center of the engagement hole portion 8 and the cross bar 4 is engaged with the main bar 3. Has been.

次に、上記構成における、サイドバー２と、メインバー３と、クロスバー４からなるグレーチング１を組み立てる順序について説明する。
先ず、全てのメインバー３の両端の嵌合部７を図９（Ａ）の状態より図９（Ｂ）の状態に前記一対のサイドバー２の結合孔部５に嵌合させ、かかる状態で全てのメインバー３の係合孔部８にクロスバー４を差し込み、クロスバー４の係合溝９とメインバー３の係合部８ａを係合させてメインバー３とクロスバー４を結合させる（図６参照）。かかる状態で一対のサイドバー２の結合孔部５から僅かに外方に突出する嵌合部７の先端をサイドバー２の外面側より嵌合部７の端面に向って上下に２つの爪部１０を備えたかしめ用型１１でかしめる（図９（Ｃ）参照）。このとき、一対のサイドバー２の内、片側のサイドバー２側でサイドバー２の結合孔部５から僅かに外方に突出する嵌合部７の先端側を図９に示すかしめ用型１１と同形のかしめ用型で受け、他側のサイドバー２側でサイドバー２の結合孔部５から僅かに外方に突出する嵌合部７の先端側をかしめ用型１１で叩くことによりメインバー３の両端が同時にかしめられるものである。図９（Ｄ）はかしめが終わってかしめ用型１１がサイドバー２から離れていく状態を示す。このときメインバー３を１本づつかしめるのではなく、多数本のメインバー３の嵌合部７の先端を同時にかしめるものである。グレーチング１の長さが短い場合は、かしめ作業は一度で済むが、グレーチング１の長さが長くなるとかしめ作業は複数回に分けて行なえば良い。かしめられた嵌合部７の端面から変形したかしめ部１２は結合孔部５の上下に延びる凹入部６に係止してメインバー３と一対のサイドバー２との結合がなされる。 Next, the order of assembling the grating 1 composed of the side bar 2, the main bar 3, and the cross bar 4 in the above configuration will be described.
First, the fitting portions 7 at both ends of all the main bars 3 are fitted into the coupling hole portions 5 of the pair of side bars 2 from the state shown in FIG. 9A to the state shown in FIG. 9B. The cross bars 4 are inserted into the engaging hole portions 8 of all the main bars 3, and the engaging grooves 9 of the cross bars 4 and the engaging portions 8a of the main bars 3 are engaged to connect the main bars 3 and the cross bars 4. (See FIG. 6). In this state, the two claw portions are vertically moved from the outer surface side of the side bar 2 toward the end surface of the fitting portion 7 with the tip of the fitting portion 7 slightly protruding outward from the coupling hole portion 5 of the pair of side bars 2. 10 is caulked with a caulking die 11 (see FIG. 9C). At this time, the caulking die 11 shown in FIG. 9 shows the front end side of the fitting portion 7 that slightly protrudes outward from the coupling hole portion 5 of the side bar 2 on one side bar 2 side of the pair of side bars 2. The caulking die 11 hits the tip side of the fitting portion 7 slightly protruding outward from the coupling hole portion 5 of the side bar 2 on the other side bar 2 side. Both ends of the bar 3 are caulked at the same time. FIG. 9D shows a state in which the caulking die 11 is separated from the side bar 2 after caulking is completed. At this time, the main bars 3 are not clamped one by one, but the tips of the fitting portions 7 of the multiple main bars 3 are simultaneously caulked. When the length of the grating 1 is short, the caulking work may be performed once. However, when the length of the grating 1 is increased, the caulking work may be performed in a plurality of times. The caulking portion 12 deformed from the end face of the caulking fitting portion 7 is engaged with the recessed portion 6 extending vertically from the coupling hole portion 5 so that the main bar 3 and the pair of side bars 2 are coupled.

そして、上記したようにメインバー３と一対のサイドバー２との結合がなされた後は、短辺側に他の一対のサイドバー２を位置させ、この他の一対のサイドバー２の端部を前記一対のサイドバー２に溶接して結合させるとともに、この他の一対のサイドバー２の中間部を前記クロスバー４の端部に溶接して結合させることによりグレーチング１が完成する。   After the main bar 3 and the pair of side bars 2 are coupled as described above, the other pair of side bars 2 is positioned on the short side, and the end portions of the other pair of side bars 2 are placed. Is joined to the pair of side bars 2 by welding, and the intermediate portion of the other pair of side bars 2 is welded to the end of the cross bar 4 to complete the grating 1.

ところで、以上述べた実施の形態ではメインバー３はＩ型のものを用いているが、Ｔ型などのメインバーを用いることも可能である。また、グレーチング１の材料としてはステンレス以外に鉄であっても良い。   By the way, in the embodiment described above, the I-type main bar 3 is used, but a T-type main bar can also be used. Further, the material of the grating 1 may be iron other than stainless steel.

本発明の一実施の形態におけるグレーチングに使用されるメインバーの斜視図である。It is a perspective view of the main bar used for grating in one embodiment of the present invention. 同メインバーの正面図である。It is a front view of the main bar. 同サイドバーの斜視図である。It is a perspective view of the side bar. 同サイドバーの縦断面図である。It is a longitudinal cross-sectional view of the side bar. 同クロスバーの斜視図である。It is a perspective view of the crossbar. 同グレーチングの組み立て途中の状態を示す斜視図である。It is a perspective view which shows the state in the middle of the assembly of the grating. 同グレーチングの完成状態を示す斜視図である。It is a perspective view which shows the completion state of the grating. 図７の要部拡大斜視図である。It is a principal part expansion perspective view of FIG. （Ａ）〜（Ｄ）は同メインバーとサイドバーとの結合作業順序を示す説明図である。(A)-(D) are explanatory drawings which show the joining operation | work order of the main bar and a side bar.

符号の説明Explanation of symbols

１ グレーチング
２ サイドバー
３ メインバー
３ａ 端面
４ クロスバー
５ 結合孔部
６ 凹入部
７ 嵌合部
８ 係合孔部
８ａ 係合部
９ 係合溝
１０ 爪部
１１ かしめ用型
１２ かしめ部 DESCRIPTION OF SYMBOLS 1 Grating 2 Side bar 3 Main bar 3a End surface 4 Cross bar 5 Coupling hole part 6 Recessed part 7 Fitting part 8 Engaging hole part 8a Engaging part 9 Engaging groove 10 Claw part 11 Caulking type | mold 12 Caulking part

Claims (1)

互いに平行な一対のサイドバーと、この一対のサイドバー間に位置しこの一対のサイドバーに対して直角方向に向き等間隔おきに配列される多数本のメインバーとを備え、等間隔おきに縦向きの長孔状に形成されたサイドバーの結合孔部にメインバーの両端部においてメインバーの上下に向く幅方向の中間部に形成された嵌合部を嵌合させ、サイドバーの外面側よりかしめられてメインバーをサイドバーに固定するようにしたグレーチングの製造方法であって、メインバーの端部の嵌合部をサイドバーの結合孔部に嵌合させた状態で、結合孔部から僅かに外方に突出する嵌合部の先端をサイドバーの外面側より嵌合部の端面に向って上下に２つの爪部を備えたかしめ用型でかしめる工程を含み、前記上下２つの爪部の内、上側の爪部は上面が先端に向って傾斜し且つ下面が水平となるように先端が尖っており、下側の爪部は下面が先端に向って傾斜し且つ上面が水平となるように先端が尖っており、この２つの爪部を備えたかしめ用型によりかしめられた嵌合部の端面は上下の両端近傍が抉られて上部では上側に、下部では下側に飛び出すように変形してサイドバーの外面に係止するようにしたことを特徴とするグレーチングの製造方法。 A pair of side bars parallel to each other and a plurality of main bars located between the pair of side bars and arranged at equal intervals in a direction perpendicular to the pair of side bars. A fitting portion formed in the middle portion in the width direction facing the top and bottom of the main bar at both ends of the main bar is fitted to the joint hole portion of the side bar formed in the shape of a vertically long slot, and the outer surface of the side bar A manufacturing method of a grating that is caulked from the side to fix the main bar to the side bar, with the fitting hole at the end of the main bar being fitted into the coupling hole of the side bar. A step of caulking with a caulking die provided with two claw portions up and down from the outer surface side of the side bar toward the end surface of the fitting portion. Of the two claw parts, the upper claw part has an upper surface. The tip is pointed so that the bottom surface is inclined and the lower surface is horizontal, and the lower claw portion has the tip pointed so that the lower surface is inclined toward the tip and the upper surface is horizontal. The end face of the fitting part that is caulked by the caulking die with two claw parts is squeezed near the upper and lower ends and deformed so that it protrudes upward at the upper part and downward at the lower part, and locked to the outer surface of the side bar The manufacturing method of the grating characterized by having made it do.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4899777A (en) * 1972-03-31 1973-12-17
JPH05202555A (en) * 1992-01-28 1993-08-10 Nippon Kinzoku Co Ltd Grating
JP2000087441A (en) * 1998-09-16 2000-03-28 Kaneso Co Ltd Grating
JP2003154422A (en) * 2001-11-20 2003-05-27 Honda Motor Co Ltd Calking apparatus
JP2005068945A (en) * 2003-08-28 2005-03-17 Chubu Corporation Grating and its production method
JP3824263B2 (en) * 2002-03-19 2006-09-20 株式会社中部コーポレーション Grating and manufacturing method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4899777A (en) * 1972-03-31 1973-12-17
JPH05202555A (en) * 1992-01-28 1993-08-10 Nippon Kinzoku Co Ltd Grating
JP2000087441A (en) * 1998-09-16 2000-03-28 Kaneso Co Ltd Grating
JP2003154422A (en) * 2001-11-20 2003-05-27 Honda Motor Co Ltd Calking apparatus
JP3824263B2 (en) * 2002-03-19 2006-09-20 株式会社中部コーポレーション Grating and manufacturing method thereof
JP2005068945A (en) * 2003-08-28 2005-03-17 Chubu Corporation Grating and its production method

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