JP2021084739A

JP2021084739A - drum

Info

Publication number: JP2021084739A
Application number: JP2019213954A
Authority: JP
Inventors: 大鷲　高司; Takashi Owashi; 高司大鷲; 英嗣中井; Hidetsugu Nakai
Original assignee: Sanko Co Ltd
Current assignee: Sanko Co Ltd
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2021-06-03
Anticipated expiration: 2039-11-27
Also published as: JP7264478B2

Abstract

To provide a drum in which flange parts can be stably stacked, and thereby the assembled state can be stabilized.SOLUTION: A drum 1 comprises a substantially cylindrical barrel part 2, and a pair of flange parts 3 disposed at both ends of the barrel part 2 and projecting outward from an outer peripheral surface of the barrel part 2. The drum 1 is used for storing a long material wound around the barrel part 2. The barrel part 2 and the flange part 3 are formed separately, and the drum 1 is formed through assembly of the barrel part 2 and the pair of flange parts 3. On a rear surface 6 of the flange part 3 opposed to the barrel part 2, an assembling engagement part 11 to be engaged with the end of the barrel part 2 in an assembled state of the drum 1 and a stacking engagement part 13 to be engaged with a recessed part 12 disposed on a front surface 7 opposite to the rear surface 6 of the upper flange part 3 when the flange parts 3 are directly stacked with each rear surface 6 facing upward are disposed. The stacking engagement part 13 is disposed at a position different from the assembling engagement part 11 in a radial direction of the barrel part 2.SELECTED DRAWING: Figure 9

Description

本発明は、長尺物を巻回可能なドラムに関するものである。 The present invention relates to a drum capable of winding a long object.

従来、フレキシブルな長尺物を巻回して保管等するドラムが知られている。ドラムとしては、例えば、略円筒状の胴部と、胴部の両端部に設けられ、胴部よりも径の大きな略円盤状の鍔部とを備え、胴部に長尺物が巻回されるようになっている（例えば、特許文献１等参照。）。胴部、及び、鍔部は、別々に形成され、ドラムとして組立てられる前は、別々に保管・運搬される。 Conventionally, a drum for winding and storing a flexible long object has been known. The drum includes, for example, a substantially cylindrical body portion and a substantially disk-shaped collar portion provided at both ends of the body portion and having a diameter larger than that of the body portion, and a long object is wound around the body portion. (For example, refer to Patent Document 1 and the like). The body and collar are formed separately and are stored and transported separately before being assembled as a drum.

また、鍔部の裏面（胴部との対向面）には、胴部の端部が嵌まり込む略円環状の溝部が設けられるとともに、溝部を構成する壁部のうち鍔部の（径方向における）内方側の壁部を鍔部の裏面よりも突出させることでずれ防止用突部が設けられている。さらに、鍔部の裏面とは反対側の表面には、裏面側のずれ防止用突部に対応する位置に沿って凹部が設けられている。そして、裏面を上向きとして鍔部同士を直接積重ねた場合に、下側の鍔部のずれ防止用突部が、上側の鍔部の凹部に挿入され、これにより、上下の鍔部の水平方向における相対変位が規制されるようになっている。また、ずれ防止用突部は、ドラムの組立状態において、溝部を構成する壁部とともに胴部に略当接し、ドラムの組立状態の安定化に貢献するようになっている。 Further, on the back surface of the collar portion (the surface facing the body portion), a substantially annular groove portion into which the end portion of the body portion is fitted is provided, and among the wall portions constituting the groove portion, the collar portion (in the radial direction) is provided. By projecting the inner wall portion (in the above) from the back surface of the flange portion, a protrusion for preventing slippage is provided. Further, a recess is provided on the surface of the collar portion opposite to the back surface along the position corresponding to the slip prevention protrusion on the back surface side. Then, when the collars are directly stacked with the back surface facing upward, the protrusion for preventing displacement of the lower collar is inserted into the recess of the upper collar, whereby the upper and lower collars are in the horizontal direction. Relative displacement is regulated. Further, the protrusion for preventing slippage substantially contacts the body portion together with the wall portion forming the groove portion in the assembled state of the drum, and contributes to the stabilization of the assembled state of the drum.

特開２００２−３７５３３号公報JP-A-2002-37533

ところで、鍔部同士を直接積重ねて運搬等する際に、ずれ防止用突部によって上下の鍔部の水平方向における相対変位を防止した場合には、ずれ防止用突部に対して負荷がかけられてしまい、ずれ防止用突部が変形したり疲労したりすることが懸念される。このため、ドラムを組立てた後、ずれ防止用突部、及び、当該ずれ防止用突部に連続する溝部を構成する壁部により、胴部と、鍔部との間の胴部の径方向における相対変位を防止する等した場合に、ずれ防止用突部が破損したり、該ずれ防止用突部の破損が溝部を構成する壁部に波及して破損したりする等のリスクが高められてしまうおそれがある。ずれ防止用突部等が破損等してしまうと、ドラムの組立状態の安定性が低下することが懸念される。 By the way, when the flanges are directly stacked and transported, if the displacement prevention protrusions prevent the relative displacement of the upper and lower collars in the horizontal direction, a load is applied to the displacement prevention protrusions. There is a concern that the protrusion for preventing slippage may be deformed or tired. Therefore, after assembling the drum, the displacement prevention protrusion and the wall portion forming the groove continuous with the displacement prevention protrusion are provided in the radial direction of the body portion between the body portion and the collar portion. When the relative displacement is prevented, there is an increased risk that the slip prevention protrusion is damaged, or the damage of the slip prevention protrusion spreads to the wall portion constituting the groove and is damaged. There is a risk that it will end up. If the protrusion for preventing slippage is damaged, there is a concern that the stability of the assembled state of the drum may be reduced.

本発明は、上記例示した問題点等を解決するためになされたものであって、その目的は、鍔部同士を安定して積重ね可能としつつ、組立状態の安定化を図ることのできるドラムを提供することにある。 The present invention has been made to solve the above-exemplified problems and the like, and an object of the present invention is to provide a drum capable of stabilizing the assembled state while stably stacking the collar portions. To provide.

以下、上記目的等を解決するのに適した各手段につき項分けして説明する。なお、必要に応じて対応する手段に特有の作用効果等を付記する。 Hereinafter, each means suitable for solving the above object and the like will be described separately for each item. In addition, if necessary, the action and effect peculiar to the corresponding means will be added.

手段１．略筒状の胴部と、前記胴部の両端部に設けられ、前記胴部の外周面よりも外方に突出する鍔部とを備え、長尺物が前記胴部に巻回可能とされ、前記胴部と、前記鍔部とは別体により構成されるとともに、前記胴部と、一対の前記鍔部とが組立てられてなるドラムにおいて、
前記鍔部のうち前記胴部と対向する裏面には、
前記ドラムの組立状態において前記胴部の端部と係合する組立用係合部と、
前記裏面を上向きとして前記鍔部同士を直接積重ねた場合に、上側の前記鍔部のうち前記裏面とは反対側の表面に設けられた凹部と係合する段積み用係合部とが設けられ、
前記段積み用係合部は、前記胴部の内外方向において、前記組立用係合部とは異なる位置に設けられていることを特徴とするドラム。 Means 1. It is provided with a substantially tubular body portion and flange portions provided at both ends of the body portion and projecting outward from the outer peripheral surface of the body portion, so that a long object can be wound around the body portion. In a drum in which the body portion and the collar portion are separately formed, and the body portion and the pair of the collar portions are assembled.
On the back surface of the collar portion facing the body portion,
An assembly engaging portion that engages with the end portion of the body portion in the assembled state of the drum, and an assembly engaging portion.
When the collar portions are directly stacked with the back surface facing upward, a stacking engaging portion that engages with a recess provided on the surface of the upper collar portion opposite to the back surface is provided. ,
The drum is characterized in that the stacking engaging portion is provided at a position different from that of the assembling engaging portion in the inner and outer directions of the body portion.

手段１によれば、鍔部において、胴部との組立状態を保持するための組立用係合部と、鍔部同士を安定して積重ねる（段積みする）ための段積み用係合部との形成位置が胴部の内外方向において異なることにより、鍔部の段積み状態において段積み用係合部に作用した外力が組立用係合部には作用しない、又は、作用し難い構成とすることができる。従って、鍔部を段積み状態として保管・運搬する際の組立用係合部へのダメージを飛躍的に低減させることができ、鍔部を胴部と組立てる段階で組立用係合部が既に変形したり疲労してしまったりしているといった事態を回避することができる。これにより、ドラムの組立状態において組立用係合部が破損等を起こし易くなったり、ドラムの組立作業時において組立用係合部の変形に起因して組立て難くなったりしてしまうといった懸念を払拭することができる。結果として、鍔部同士を安定して（水平方向への位置ずれを生じさせることなく）段積み可能としつつ、ドラムの組立状態の安定化、耐久性の向上等を図ることができ、ドラムの破損等に起因する長尺物の損傷等のリスクを大幅に低減させることができる。 According to the means 1, in the collar portion, an assembly engaging portion for maintaining the assembled state with the body portion and a stacking engaging portion for stably stacking (stacking) the collar portions with each other. Since the forming position of and is different in the inner and outer directions of the body portion, the external force acting on the stacking engaging portion in the stacked state of the collar portion does not act on the assembling engaging portion or is difficult to act. can do. Therefore, it is possible to dramatically reduce the damage to the assembly engaging part when the collar is stored and transported in a stacked state, and the assembly engaging part is already deformed at the stage of assembling the collar with the body. It is possible to avoid situations such as being tired or tired. As a result, there is a concern that the assembling engaging part is likely to be damaged in the assembled state of the drum, and that it becomes difficult to assemble due to the deformation of the assembling engaging part during the assembling work of the drum. can do. As a result, it is possible to stabilize the assembled state of the drum, improve the durability, etc., while making it possible to stack the collars stably (without causing a displacement in the horizontal direction). The risk of damage to long objects due to damage can be significantly reduced.

手段２．前記段積み用係合部は、円環状に連続して設けられていることを特徴とする手段１に記載のドラム。 Means 2. The drum according to means 1, wherein the stacking engaging portion is continuously provided in an annular shape.

手段２によれば、鍔部を段積みする場合の方向性がなくなり（裏面を上向きとして鍔部を段積みする場合に、鍔部同士の相対的な向きを合わせなければ上側の鍔部の凹部が、下側の鍔部の段積み用係合部と係合しないといった事態が回避され）、鍔部を段積みする際の作業性の向上や、凹部と段積み用係合部とが確実に係合されていない状態のまま鍔部が積重ねられるといった作業ミスの抑制等を図ることができる。また、段積み用係合部の強度や剛性を高めることができ、段積み用係合部の破損等を抑制し、鍔部の段積み状態の安定化等を図ることができる。 According to the means 2, there is no directionality when stacking the collar portions (when stacking the collar portions with the back surface facing upward, if the relative orientations of the collar portions are not matched, the concave portion of the upper collar portion is used. However, the situation where it does not engage with the stacking engagement part of the lower collar part is avoided), workability when stacking the collar part is improved, and the recess and the stacking engagement part are sure. It is possible to suppress work mistakes such as stacking of collars without being engaged with. In addition, the strength and rigidity of the stacking engaging portion can be increased, damage to the stacking engaging portion can be suppressed, and the stacking state of the flange portion can be stabilized.

手段３．前記裏面を上向きとして前記鍔部同士を直接積重ねた場合に、下側の前記鍔部の前記裏面のうち前記組立用係合部よりも外方側の範囲が、上側の前記鍔部から離間するように構成されていることを特徴とする手段１又は２に記載のドラム。 Means 3. When the collar portions are directly stacked with the back surface facing upward, the range of the back surface of the lower collar portion on the outer side of the assembly engaging portion is separated from the upper collar portion. The drum according to means 1 or 2, wherein the drum is configured in such a manner.

手段３によれば、鍔部の裏面のうち、組立用係合部よりも鍔部の内外方向の外方側の範囲、すなわち、巻回された長尺物と対向し得る範囲に関しては、鍔部の段積み状態において、他の鍔部と接触しないようになっている。従って、鍔部の段積み状態において、鍔部の裏面のうち長尺物と対向し得る範囲が、他の鍔部と接触して変形したり破損したりするといった事態を回避することができ、結果として、胴部に巻回された長尺物が、破損等した鍔部に接触する等して損傷する等の事態を防止することができる。 According to the means 3, of the back surface of the collar portion, the range on the outer side in the inner / outer direction of the collar portion from the engaging portion for assembly, that is, the range that can face the wound long object is the collar portion. In the stacked state of the parts, it does not come into contact with other collar parts. Therefore, in the stacked state of the collar portions, it is possible to avoid a situation in which the range of the back surface of the collar portions that can face a long object is deformed or damaged in contact with other collar portions. As a result, it is possible to prevent a situation in which a long object wound around the body is damaged by coming into contact with a damaged collar or the like.

手段４．前記鍔部の前記表面には、前記凹部を跨ぐようにしてシボ加工が施された機能部が設けられ、
前記鍔部には、前記表面側において、前記機能部よりも前記鍔部の厚み方向に突出する部位が設けられていることを特徴とする手段１乃至３のいずれかに記載のドラム。 Means 4. On the surface of the collar portion, a functional portion that has been textured so as to straddle the recess is provided.
The drum according to any one of means 1 to 3, wherein the collar portion is provided with a portion on the surface side that protrudes in the thickness direction of the collar portion from the functional portion.

手段４によれば、シボ加工（微細突部又は微細凹部）が施された機能部にラベルを貼着することで、ラベルを剥がし易くすることができる。さらに、機能部が凹部を跨いで設けられることでラベルを貼着する面積を極力広く確保することができる上、ラベルを剥がす際に凹部を介してラベルの裏側に指先等を掛けることができ、作業を行い易くすることができる。また、鍔部の表面側において、機能部よりも鍔部の厚み方向に突出する部位が設けられることにより、機能部に貼着されたラベルが建物の壁等に接触することを抑止することができる。従って、ラベルの保護を図ることができ、ラベルが読み取り難くなる等の懸念を抑制することができる。尚、「前記突出する部位は、前記機能部を囲むようにして環状に設けられていること」としてもよい。 According to the means 4, the label can be easily peeled off by attaching the label to the functional portion that has been textured (fine protrusions or fine recesses). Further, since the functional portion is provided so as to straddle the concave portion, the area for attaching the label can be secured as large as possible, and when the label is peeled off, the fingertip or the like can be hung on the back side of the label via the concave portion. The work can be facilitated. In addition, by providing a portion on the surface side of the collar portion that protrudes in the thickness direction of the collar portion from the functional portion, it is possible to prevent the label attached to the functional portion from coming into contact with the wall of the building or the like. it can. Therefore, the label can be protected, and the concern that the label becomes difficult to read can be suppressed. It should be noted that "the protruding portion may be provided in an annular shape so as to surround the functional portion".

ドラムの斜視図である。It is a perspective view of a drum. 鍔部の表面側の斜視図である。It is a perspective view of the front surface side of a collar part. 鍔部の表面側を示す一部断面を含む斜視図である。It is a perspective view which includes a partial cross section which shows the surface side of a flange part. 鍔部の裏面側の斜視図である。It is a perspective view of the back side of a collar part. 鍔部の裏面側を示す一部断面を含む斜視図である。It is a perspective view which includes a partial cross section which shows the back surface side of a flange part. 胴部の斜視図である。It is a perspective view of the body part. 胴部の一部断面を含む斜視図である。It is a perspective view including a part cross section of a body part. 鍔部同士を段積みした状態を示す断面図である。It is sectional drawing which shows the state in which the flange portions are stacked. 胴部の端部が鍔部の組立用係合部に係合された状態を示す一部断面を含む斜視図である。It is a perspective view which includes a partial cross section which shows the state which the end part of the body part was engaged with the assembly engaging part of a flange part. 胴部の端部が鍔部の組立用係合部に係合された状態（組立状態）を示す部分拡大断面図である。It is a partially enlarged sectional view which shows the state (assembly state) that the end part of the body part was engaged with the assembly engagement part of the flange part. 胴部の端部が鍔部の組立用係合部に係合された状態（組立状態）の胴部を切断した場合の断面図である。It is sectional drawing in the case of cutting the body part in the state (assembly state) that the end part of the body part was engaged with the assembly engaging part of the flange part. 胴部の端部が鍔部の組立用係合部に係合された状態（組立状態）の胴部を切断した場合の断面を含む斜視図である。It is a perspective view which includes the cross section at the time of cutting the body part in the state which the end part of the body part is engaged with the assembly engaging part of the flange part (assembly state). 組立準備状態にある胴部、及び、鍔部を示す一部断面を含む斜視図である。It is a perspective view which includes a partial cross section which shows the body part which is in the assembly preparation state, and the collar part. 組立準備状態にある胴部、及び、鍔部を示す一部断面を含む斜視図である。It is a perspective view which includes a partial cross section which shows the body part which is in the assembly preparation state, and the collar part.

以下に、一実施形態について図面を参照して説明する。図１に示すように、フレキシブルな長尺物を運搬、及び、保管等する場合に使用されるドラム１は、長尺物が巻回される略円筒状の胴部２と、胴部２の両端部に設けられ、外径が胴部２の外径よりも大きな略円盤状をなす鍔部３とを備えている。胴部２と、鍔部３とは別体により構成され、ドラム１は、胴部２と、一対の鍔部３とが、各径の中心が同一直線上に位置するように組立てられることにより構成されている。また、胴部２と一対の鍔部３との間は、胴部２、及び、一対の鍔部３を貫通するようにして設けられるボルト４、及び、ナット５を使用して連結される。本実施形態の胴部２、及び、鍔部３は、それぞれポリプロピレンにより一体的に形成されている。 Hereinafter, one embodiment will be described with reference to the drawings. As shown in FIG. 1, the drum 1 used for transporting and storing a flexible long object includes a substantially cylindrical body 2 around which the long object is wound and a body 2 of the body 2. It is provided at both ends and includes a collar portion 3 having a substantially disk shape having an outer diameter larger than the outer diameter of the body portion 2. The body portion 2 and the collar portion 3 are formed separately, and the drum 1 is assembled by assembling the body portion 2 and the pair of collar portions 3 so that the centers of the respective diameters are located on the same straight line. It is configured. Further, the body portion 2 and the pair of collar portions 3 are connected by using the body portion 2, the bolt 4 provided so as to penetrate the pair of collar portions 3, and the nut 5. The body portion 2 and the collar portion 3 of the present embodiment are integrally formed of polypropylene.

図４、図５に示すように、鍔部３のうち胴部２と対向する裏面６には、ドラム１の組立状態において胴部２の端部と係合する組立用係合部１１と、図８に示すように、裏面６を上向きとして鍔部３同士を直接積重ねた（段積みした）場合に、上側の鍔部３のうち裏面６とは反対側の表面７に設けられた凹部１２（図２参照）と係合する段積み用係合部１３とが設けられている。 As shown in FIGS. 4 and 5, the back surface 6 of the collar portion 3 facing the body portion 2 has an assembly engaging portion 11 that engages with the end portion of the body portion 2 in the assembled state of the drum 1. As shown in FIG. 8, when the flange portions 3 are directly stacked (stacked) with the back surface 6 facing upward, the recess 12 provided on the front surface 7 of the upper flange portion 3 opposite to the back surface 6 is provided. A stacking engaging portion 13 that engages with (see FIG. 2) is provided.

より具体的に説明すると、図２〜図５等に示すように、鍔部３は、略円環状の平板からなる基板部１４と、基板部１４の内周縁の表面７側から基板部１４に対して直交する方向に突出する円形枠状（円筒状）の第１内周リブ１５と、第１内周リブ１５よりも一回り小さい円形枠状をなし、第１内周リブ１５の内方側において第１内周リブ１５と同心円となるように設けられる第２内周リブ１６と、第１内周リブ１５と第２内周リブ１６との間を連結する連結部１７と、第２内周リブ１６の周方向全域にわたり第２内周リブ１６の内周面から内方へ突出する略円環板状の中央板部１８とを備えている。連結部１７は、第１内周リブ１５、及び、第２内周リブ１６の裏面６側の端縁よりも鍔部３の厚み方向中央部側の部位の間を連結しており、本実施形態では、第１内周リブ１５と、第２内周リブ１６と、連結部１７とによって、鍔部３の裏面６側に開口する前記組立用係合部１１が構成されている。 More specifically, as shown in FIGS. 2 to 5, the flange portion 3 is formed on a substrate portion 14 made of a substantially annular flat plate and from the surface 7 side of the inner peripheral edge of the substrate portion 14 to the substrate portion 14. A circular frame-shaped (cylindrical) first inner peripheral rib 15 projecting in a direction orthogonal to the first inner peripheral rib 15 and a circular frame shape slightly smaller than the first inner peripheral rib 15 are formed, and the inner side of the first inner peripheral rib 15 is formed. A second inner peripheral rib 16 provided so as to be concentric with the first inner peripheral rib 15 on the side, a connecting portion 17 connecting between the first inner peripheral rib 15 and the second inner peripheral rib 16, and a second It is provided with a substantially annular plate-shaped central plate portion 18 projecting inward from the inner peripheral surface of the second inner peripheral rib 16 over the entire circumferential direction of the inner peripheral rib 16. The connecting portion 17 connects the first inner peripheral rib 15 and the portion of the second inner peripheral rib 16 on the central portion side in the thickness direction of the collar portion 3 with respect to the end edge on the back surface 6 side. In the embodiment, the first inner peripheral rib 15, the second inner peripheral rib 16, and the connecting portion 17 constitute the assembly engaging portion 11 that opens to the back surface 6 side of the collar portion 3.

加えて、図５、図８等に示すように、本実施形態の組立用係合部１１の連結部１７は、鍔部３の内方側の連結内周部１７ａと、鍔部３の外方側の連結外周部１７ｂとを備え、鍔部３の厚み方向において、連結内周部１７ａの方が第２内周リブ１６の裏面６側の端縁に近く、連結外周部１７ｂの方が鍔部３の厚み方向中央部側に近くなるようにして段差状をなしている。尚、連結部１７は、連結内周部１７ａの外周縁と、連結外周部１７ｂの内周縁との間を連結する保持壁部１７ｃを備えている。 In addition, as shown in FIGS. 5, 8 and the like, the connecting portion 17 of the assembling engaging portion 11 of the present embodiment includes the connecting inner peripheral portion 17a on the inner side of the collar portion 3 and the outer portion of the collar portion 3. The connecting outer peripheral portion 17b is provided on the side, and the connecting inner peripheral portion 17a is closer to the edge of the second inner peripheral rib 16 on the back surface 6 side in the thickness direction of the flange portion 3, and the connecting outer peripheral portion 17b is closer. The flange portion 3 has a stepped shape so as to be closer to the central portion side in the thickness direction. The connecting portion 17 includes a holding wall portion 17c that connects the outer peripheral edge of the connecting inner peripheral portion 17a and the inner peripheral edge of the connecting outer peripheral portion 17b.

また、図３、図８に示すように、第２内周リブ１６の表面７側の端縁は、第１内周リブ１５の表面７側の端縁よりも鍔部３の厚み方向中央部側に位置しており、中央板部１８は、第２内周リブ１６の表面７側の端縁に連結されている。さらに、図２、図５等に示すように、中央板部１８の中央部には、中央板部１８を貫通する円形状の中央開口部２１が設けられている。加えて、中央板部１８の裏面６側の中央開口部２１の周縁部から中央板部１８に対して直交する方向に突出する円形枠状の軸筒部２２が設けられている。 Further, as shown in FIGS. 3 and 8, the edge of the second inner peripheral rib 16 on the surface 7 side is the central portion of the collar portion 3 in the thickness direction with respect to the edge of the first inner peripheral rib 15 on the surface 7 side. It is located on the side, and the central plate portion 18 is connected to the edge of the second inner peripheral rib 16 on the surface 7 side. Further, as shown in FIGS. 2, 5 and the like, a circular central opening 21 penetrating the central plate 18 is provided in the central portion of the central plate 18. In addition, a circular frame-shaped shaft cylinder portion 22 is provided that projects in a direction orthogonal to the central plate portion 18 from the peripheral edge portion of the central opening 21 on the back surface 6 side of the central plate portion 18.

図２、図３に示すように、凹部１２は、中央板部１８のうち中央開口部２１と、第２内周リブ１６との間の中間位置において、第２内周リブ１６等と同心円状に設けられ、鍔部３の表面７側に開口する断面略コ字状に構成されている。また、図４、図５に示すように、本実施形態の段積み用係合部１３は、凹部１２の底部を構成する壁部の裏面６側から、凹部１２の全周にわたり、中央板部１８に対して直交する方向に突出するようにして円形枠状に設けられている。段積み用係合部１３は、鍔部３の内外方向（径方向、ドラム１の中心軸に対して直交する方向）において、凹部１２の側部を構成する一対の壁部の間の範囲に収まるように設けられている。尚、上記のように、凹部１２は、胴部２（鍔部３）の内外方向において、組立用係合部１１よりも鍔部３の内方側に離間した位置に設けられている。また、凹部１２の裏面６側に設けられた段積み用係合部１３についても、胴部２の内外方向において、組立用係合部１１とは異なる位置（組立用係合部１１から鍔部３の内方側、すなわち、中心側に離間した位置）に設けられている。さらに、本実施形態の凹部１２、及び、段積み用係合部１３は、鍔部３の表面７又は裏面６を正面視した場合に、いずれも円環状に連続して設けられている（図２等参照）。 As shown in FIGS. 2 and 3, the concave portion 12 is concentric with the second inner peripheral rib 16 and the like at an intermediate position between the central opening 21 and the second inner peripheral rib 16 in the central plate portion 18. It is provided in the above and has a substantially U-shaped cross section that opens to the surface 7 side of the collar portion 3. Further, as shown in FIGS. 4 and 5, the stacking engaging portion 13 of the present embodiment has a central plate portion extending from the back surface 6 side of the wall portion constituting the bottom portion of the recess 12 to the entire circumference of the recess 12. It is provided in a circular frame shape so as to project in a direction orthogonal to 18. The stacking engaging portion 13 is located in the range between the pair of wall portions forming the side portions of the recess 12 in the inner and outer directions (diameter direction, direction orthogonal to the central axis of the drum 1) of the flange portion 3. It is provided so that it fits. As described above, the recess 12 is provided at a position separated from the assembly engaging portion 11 on the inner side of the collar portion 3 in the inner and outer directions of the body portion 2 (flange portion 3). Further, the stacking engaging portion 13 provided on the back surface 6 side of the recess 12 is also at a position different from that of the assembling engaging portion 11 in the inner and outer directions of the body portion 2 (from the assembling engaging portion 11 to the collar portion). It is provided on the inner side of No. 3, that is, a position separated from the center side). Further, the recess 12 and the stacking engaging portion 13 of the present embodiment are both continuously provided in an annular shape when the front surface 7 or the back surface 6 of the collar portion 3 is viewed from the front (FIG. FIG. See 2nd class).

また、図８等に示すように、本実施形態では、鍔部３の厚み方向において、段積み用係合部１３の裏面６側の端縁は、第２内周リブ１６の裏面６側の端縁よりも裏面６側（図８の上側）に突出している。さらに、基板部１４の裏面６（第１内周リブ１５の裏面６側の端縁）は、第２内周リブ１６の裏面６側の端縁よりも鍔部３の厚み方向の中央部側（図８の下側）に位置している。加えて、鍔部３の厚み方向において、軸筒部２２の裏面６側の端縁は、基板部１４の裏面６と同じ位置となっている。尚、第２内周リブ１６と軸筒部２２との間は、段積み用係合部１３、及び、凹部１２を介して内周側補強リブ２３によって連結されており、当該内周側補強リブ２３の裏面６側の端縁についても、鍔部３の厚み方向において、軸筒部２２の裏面６側の端縁、及び、基板部１４の裏面６と同じ位置となっている。 Further, as shown in FIG. 8 and the like, in the present embodiment, in the thickness direction of the flange portion 3, the edge on the back surface 6 side of the stacking engaging portion 13 is on the back surface 6 side of the second inner peripheral rib 16. It protrudes from the edge to the back surface 6 side (upper side in FIG. 8). Further, the back surface 6 of the substrate portion 14 (the edge of the first inner peripheral rib 15 on the back surface 6 side) is closer to the central portion of the flange portion 3 in the thickness direction than the edge of the second inner peripheral rib 16 on the back surface 6 side. It is located (lower side of FIG. 8). In addition, in the thickness direction of the flange portion 3, the edge of the barrel portion 22 on the back surface 6 side is at the same position as the back surface 6 of the substrate portion 14. The second inner peripheral rib 16 and the barrel portion 22 are connected by an inner peripheral side reinforcing rib 23 via a stacking engaging portion 13 and a recess 12, and the inner peripheral side reinforcing rib 23 is connected. The edge of the rib 23 on the back surface 6 side is also at the same position as the edge of the barrel portion 22 on the back surface 6 side and the back surface 6 of the substrate portion 14 in the thickness direction of the flange portion 3.

そして、図８に示すように、裏面６を上向きとして鍔部３を段積みした場合には、下側の鍔部３の段積み用係合部１３の裏面６側の端縁が、上側の鍔部３の凹部１２に挿入され、凹部１２の底面と当接するとともに、段積み用係合部１３の内周面、及び、外周面が、凹部１２の側部と当接又は近接する（係合する）ようになっている。また、裏面６を上向きとして鍔部３を段積みした場合に、下側の鍔部３の裏面６のうち組立用係合部１１よりも鍔部３の内外方向の外方側の範囲である基板部１４の裏面６が、上側の鍔部３から下方に離間する（上側の鍔部３と接触しない）ように構成されている。尚、本実施形態では、鍔部３を段積みした場合に、下側の鍔部３の第２内周リブ１６の裏面６側の端縁が、上側の鍔部３の第２内周リブ１６の表面７側の端縁と当接するように構成されているが、当接しないように構成してもよい。さらに、鍔部３を段積みした場合に、内周側補強リブ２３の裏面６側の端縁が上側の鍔部３に当接して支持する構成としてもよい。 Then, as shown in FIG. 8, when the collar portions 3 are stacked with the back surface 6 facing upward, the edge of the lower collar portion 3 on the back surface 6 side of the stacking engaging portion 13 is on the upper side. It is inserted into the recess 12 of the flange portion 3 and abuts on the bottom surface of the recess 12, and the inner peripheral surface and the outer peripheral surface of the stacking engaging portion 13 abut or approach the side portion of the recess 12. It fits). Further, when the collar portions 3 are stacked with the back surface 6 facing upward, the range of the back surface 6 of the lower collar portion 3 on the outer side in the inner / outer direction of the collar portion 3 with respect to the assembly engaging portion 11. The back surface 6 of the substrate portion 14 is configured to be separated downward from the upper flange portion 3 (not in contact with the upper flange portion 3). In the present embodiment, when the flange portions 3 are stacked, the edge of the second inner peripheral rib 16 of the lower flange portion 3 on the back surface 6 side is the second inner peripheral rib of the upper flange portion 3. Although it is configured to come into contact with the edge of the surface 16 on the 7 side, it may be configured so as not to come into contact with it. Further, when the collar portions 3 are stacked, the edge of the inner peripheral side reinforcing rib 23 on the back surface 6 side may be in contact with the upper flange portion 3 to support it.

加えて、図２、図３等に示すように、鍔部３は、基板部１４の外周縁の表面７側から突出する円形枠状の外周リブ２４を備えている。鍔部３の厚み方向において、外周リブ２４の表面７側の端縁は、第１内周リブ１５の表面７側の端縁と同じ位置とされる。また、外周リブ２４と、第１内周リブ１５との間は、外周側補強リブ２５により連結され、当該外周側補強リブ２５の表面７側の端縁についても、鍔部３の厚み方向において、外周リブ２４、及び、第１内周リブ１５の表面７側の端縁と同じ位置とされている。 In addition, as shown in FIGS. 2 and 3, the flange portion 3 includes a circular frame-shaped outer peripheral rib 24 projecting from the surface 7 side of the outer peripheral edge of the substrate portion 14. In the thickness direction of the flange portion 3, the edge of the outer peripheral rib 24 on the surface 7 side is set to the same position as the edge of the first inner peripheral rib 15 on the surface 7 side. Further, the outer peripheral rib 24 and the first inner peripheral rib 15 are connected by the outer peripheral side reinforcing rib 25, and the edge of the outer peripheral side reinforcing rib 25 on the surface 7 side is also in the thickness direction of the flange portion 3. , The outer peripheral rib 24 and the first inner peripheral rib 15 are at the same position as the edge on the surface 7 side.

また、図２に示すように、中央板部１８の表面７側（第２内周リブ１６の表面７側の端縁も含む）には、凹部１２を跨ぐようにしてシボ加工が施された機能部２６（図２で散点模様が付された部位、本例では、中央板部１８の表面７側の全範囲に相当する）が設けられている。上記のように、中央板部１８は、第１内周リブ１５の表面７側の端縁よりも鍔部３の厚み方向中央部側に位置しており、機能部２６の微細な凹凸についても、第１内周リブ１５、外周リブ２４、及び、外周側補強リブ２５の表面７側の端縁よりも鍔部３の厚み方向中央部側に位置している。 Further, as shown in FIG. 2, the surface 7 side of the central plate portion 18 (including the edge of the second inner peripheral rib 16 on the surface 7 side) is textured so as to straddle the recess 12. A functional portion 26 (a portion with a scattered spot pattern in FIG. 2, in this example, corresponding to the entire range on the surface 7 side of the central plate portion 18) is provided. As described above, the central plate portion 18 is located on the central portion side in the thickness direction of the collar portion 3 with respect to the edge on the surface 7 side of the first inner peripheral rib 15, and also for the fine irregularities of the functional portion 26. , The first inner peripheral rib 15, the outer peripheral rib 24, and the outer peripheral side reinforcing rib 25 are located closer to the central portion in the thickness direction of the collar portion 3 than the edge on the surface 7 side.

加えて、図２等に示すように、鍔部３には、組立用係合部１１において、ボルト４を挿通させるためのボルト挿通部２７が４箇所に設けられている。さらに、図３〜図５等に示すように、各ボルト挿通部２７を囲うようにして回動規制部２８が設けられている。図４、図５に示すように、回動規制部２８は、組立用係合部１１の周方向において、各ボルト挿通部２７を挟むようにして一対で設けられる規制リブ２９を備えている。尚、規制リブ２９は、連結部１７のうち連結内周部１７ａに対応して設けられているが、連結外周部１７ｂには設けられていない。さらに、規制リブ２９の裏面６側の端縁は、第２内周リブ１６の裏面６側の端縁よりも、若干、鍔部３の厚み方向中央部側に位置している。 In addition, as shown in FIG. 2 and the like, the flange portion 3 is provided with bolt insertion portions 27 for inserting the bolts 4 in the assembly engaging portion 11. Further, as shown in FIGS. 3 to 5, a rotation restricting portion 28 is provided so as to surround each bolt insertion portion 27. As shown in FIGS. 4 and 5, the rotation restricting portion 28 includes a pair of restricting ribs 29 provided so as to sandwich the bolt insertion portions 27 in the circumferential direction of the assembling engaging portion 11. The regulation rib 29 is provided in the connecting portion 17 corresponding to the connecting inner peripheral portion 17a, but is not provided in the connecting outer peripheral portion 17b. Further, the edge of the regulation rib 29 on the back surface 6 side is located slightly closer to the center portion in the thickness direction of the collar portion 3 than the edge of the second inner peripheral rib 16 on the back surface 6 side.

また、回動規制部２８は、第２内周リブ１６のうち一対の規制リブ２９の間の部位を鍔部３の内方側に変位させた変形部３０を備えている。該変形部３０は、一対の規制リブ２９と（ほぼ）連続する一対の規制壁部３１と、規制壁部３１のうち鍔部３の内方側の端縁間を連結する補強壁部３２とを備えて、断面略コ字状をなしている。尚、第２内周リブ１６は、変形部３０を備えつつも、その全周にわたって連続して設けられている。加えて、図４、図５に示すように、組立用係合部１１において各回動規制部２８の間の部位には、連結内周部１７ａの裏面６側から突出する複数の連結補強リブ３３が設けられ、連結補強リブ３３の裏面６側の端縁は、鍔部３の厚み方向において、規制リブ２９の裏面６側の端縁と同じ位置とされている。 Further, the rotation restricting portion 28 includes a deforming portion 30 in which a portion of the second inner peripheral rib 16 between the pair of regulating ribs 29 is displaced inward of the flange portion 3. The deformed portion 30 includes a pair of regulating wall portions 31 that are (almost) continuous with the pair of regulating ribs 29, and a reinforcing wall portion 32 that connects between the inner edges of the flange portion 3 of the regulating wall portions 31. It has a substantially U-shaped cross section. The second inner peripheral rib 16 is provided continuously over the entire circumference of the deformed portion 30 while being provided with the deformed portion 30. In addition, as shown in FIGS. 4 and 5, a plurality of connecting reinforcing ribs 33 projecting from the back surface 6 side of the connecting inner peripheral portion 17a are located between the rotation restricting portions 28 in the assembling engaging portion 11. Is provided, and the edge of the connecting reinforcing rib 33 on the back surface 6 side is positioned at the same position as the edge of the regulating rib 29 on the back surface 6 side in the thickness direction of the flange portion 3.

図６、図７等に示すように、胴部２は、円筒状の本体部４１と、本体部４１の延在方向の中間位置において、本体部４１の周方向全域にわたり本体部４１の内周面から内方へ突出する略円環板状の仕切り部４２と、本体部４１の内周面から突出し、本体部４１の延在方向に沿って仕切り部４２を介して本体部４１の一端部近傍から他端部近傍にかけて延在する第１胴部側リブ４３、及び、第２胴部側リブ４４とを備えている。第１胴部側リブ４３は、胴部２の周方向において互いに対向する２条の第１胴部側リブ４３を１組として、４組の第１胴部側リブ４３が胴部２の周方向において４箇所に設けられている（鍔部３のボルト挿通部２７に対応して、本体部４１の中心軸を中心とした均等位置に設けられている）。尚、第２胴部側リブ４４は、第１胴部側リブ４３の各組の間の範囲に適宜（本例では、４条ずつ）設けられている。 As shown in FIGS. 6 and 7, the body portion 2 has an inner circumference of the main body portion 41 over the entire circumferential direction of the main body portion 41 at an intermediate position between the cylindrical main body portion 41 and the main body portion 41 in the extending direction. A substantially annular plate-shaped partition portion 42 protruding inward from the surface, and one end portion of the main body portion 41 extending inward from the inner peripheral surface of the main body portion 41 via the partition portion 42 along the extending direction of the main body portion 41. It includes a first body side rib 43 extending from the vicinity to the vicinity of the other end portion, and a second body side rib 44. The first body side rib 43 has two sets of first body side ribs 43 facing each other in the circumferential direction of the body 2, and four sets of first body side ribs 43 are the circumference of the body 2. It is provided at four locations in the direction (corresponding to the bolt insertion portion 27 of the flange portion 3 and provided at equal positions around the central axis of the main body portion 41). The second body-side ribs 44 are appropriately provided (in this example, four articles each) in the range between each set of the first body-side ribs 43.

また、本実施形態では、胴部２の延在方向において、第１胴部側リブ４３、及び、第２胴部側リブ４４の両端部は、胴部２の両端部よりも胴部２の中央部側に位置している。さらに、第１胴部側リブ４３と、第２胴部側リブ４４とに関し、胴部２の延在方向における両端部の位置、並びに、本体部４１の内周面からの突出長は互いに同じとなっているが、第２胴部側リブ４４には、胴部２の延在方向における両端部のうち本体部４１の内周側の範囲が矩形状に切り欠かれたような略Ｌ字状の切欠き部４５が設けられている。尚、図７に示すように、仕切り部４２には、一対の第１胴部側リブ４３で挟まれた位置において、仕切り部４２を貫通し、ボルト４を挿通させるためのボルト貫通孔４６が設けられている。また、ボルト貫通孔４６に対して胴部２の内方側には、仕切り部４２から本体部４１の延在方向に突出する補助リブ４７と、補助リブ４７からボルト貫通孔４６の端縁にかけて仕切り部４２からの突出方向先端縁が傾斜して設けられる三角形状の案内補強リブ４８とが設けられている。 Further, in the present embodiment, in the extending direction of the body portion 2, both ends of the first body portion side rib 43 and the second body portion side rib 44 are closer to the body portion 2 than both ends of the body portion 2. It is located on the central side. Further, with respect to the first body portion side rib 43 and the second body portion side rib 44, the positions of both ends of the body portion 2 in the extending direction and the protruding length of the main body portion 41 from the inner peripheral surface are the same. However, the rib 44 on the second body side has a substantially L-shape in which the range on the inner peripheral side of the main body 41 of both ends in the extending direction of the body 2 is cut out in a rectangular shape. A notch portion 45 having a shape is provided. As shown in FIG. 7, the partition portion 42 has a bolt through hole 46 for penetrating the partition portion 42 and inserting the bolt 4 at a position sandwiched between the pair of first body side ribs 43. It is provided. Further, on the inner side of the body portion 2 with respect to the bolt through hole 46, an auxiliary rib 47 projecting from the partition portion 42 in the extending direction of the main body portion 41, and from the auxiliary rib 47 to the end edge of the bolt through hole 46. A triangular guide reinforcing rib 48 is provided so that the tip edge in the protruding direction from the partition portion 42 is inclined.

図９に示すように、胴部２の一方の端部と、鍔部３とを係合させた状態（ドラム１の組立状態においても、胴部２と、鍔部３との相対位置関係は同じであり、図９は、説明の便宜上、組立状態の胴部２と鍔部３との位置関係を示す図としても使用する）では、胴部２（本体部４１）の端部が、鍔部３の組立用係合部１１、特に、連結外周部１７ｂと、保持壁部１７ｃと、第１内周リブ１５とで囲まれる領域に挿入（係合）された状態とされる。これにより、本体部４１と、保持壁部１７ｃ、及び、第１内周リブ１５とが胴部２（鍔部３）の内外方向（径方向）において対向して当接、又は、近接し、胴部２の内外方向における胴部２と、鍔部３との間の相対変位が規制されることとなる。また、図９、図１１、図１２に示すように、ドラム１の組立状態では、一対の第１胴部側リブ４３の端部が、鍔部３の回動規制部２８に挿入（係合）された状態（一対の規制リブ２９、並びに、一対の規制壁部３１の間に挿入された状態）とされる。これにより、第１胴部側リブ４３のうち胴部２（組立用係合部１１）の周方向に対して略直交する方向に延在する側面が、変形部３０の一対の規制壁部３１、並びに、一対の規制リブ２９と当接、又は、近接し、鍔部３の裏面６に沿った胴部２の回動変位が規制されることとなる。 As shown in FIG. 9, a state in which one end of the body 2 and the collar 3 are engaged (even in the assembled state of the drum 1, the relative positional relationship between the body 2 and the collar 3 is In the same manner, FIG. 9 is also used as a diagram showing the positional relationship between the body portion 2 and the collar portion 3 in the assembled state for convenience of explanation), the end portion of the body portion 2 (main body portion 41) has a collar. The assembly engaging portion 11 of the portion 3, particularly the connecting outer peripheral portion 17b, the holding wall portion 17c, and the first inner peripheral rib 15 are inserted (engaged) into the region. As a result, the main body portion 41, the holding wall portion 17c, and the first inner peripheral rib 15 face each other in the inner / outer direction (diameter direction) of the body portion 2 (flange portion 3), or come into close contact with each other. The relative displacement between the body portion 2 and the collar portion 3 in the inward and outward directions of the body portion 2 is regulated. Further, as shown in FIGS. 9, 11 and 12, in the assembled state of the drum 1, the ends of the pair of first body side ribs 43 are inserted (engaged) into the rotation restricting portion 28 of the flange portion 3. ) (A state of being inserted between a pair of regulating ribs 29 and a pair of regulating wall portions 31). As a result, the side surface of the first body portion side rib 43 extending in a direction substantially orthogonal to the circumferential direction of the body portion 2 (assembly engaging portion 11) is a pair of regulation wall portions 31 of the deformed portion 30. In addition, the rotational displacement of the body portion 2 along the back surface 6 of the flange portion 3 is restricted by abutting or approaching the pair of regulating ribs 29.

また、ドラム１の組立作業では、胴部２の第１胴部側リブ４３の端部と、鍔部３の回動規制部２８との位置を最初から一致させるようにして、胴部２と鍔部３とを組合わせなくても、図１３、図１４に示すように、胴部２（本体部４１）の端部を、組立用係合部１１に当て嵌めるだけで、第１胴部側リブ４３のうち胴部２の延在方向において胴部２の外方側に位置する先端部４３ａと、第２内周リブ１６の裏面６側の端縁とが当接するとともに、本体部４１の端部が、組立用係合部１１に浅く挿入される。これにより、本体部４１の端部の外周面と、鍔部３の第１内周リブ１５の内周面とが対向して当接又は近接し、本体部４１（鍔部３）の内外方向における本体部４１と鍔部３との間の相対変位が規制される。 Further, in the assembling work of the drum 1, the positions of the end portion of the first body portion side rib 43 of the body portion 2 and the rotation restricting portion 28 of the flange portion 3 are made to match from the beginning with the body portion 2. As shown in FIGS. 13 and 14, the first body portion can be obtained by simply fitting the end portion of the body portion 2 (main body portion 41) to the assembly engaging portion 11 without combining the flange portion 3. Of the side ribs 43, the tip portion 43a located on the outer side of the body portion 2 in the extending direction of the body portion 2 and the edge of the second inner peripheral rib 16 on the back surface 6 side come into contact with each other, and the main body portion 41 The end of the is shallowly inserted into the assembly engaging portion 11. As a result, the outer peripheral surface of the end portion of the main body portion 41 and the inner peripheral surface of the first inner peripheral rib 15 of the flange portion 3 face each other and come into contact with each other or come close to each other, and the main body portion 41 (flange portion 3) is in the inward / outward direction. The relative displacement between the main body portion 41 and the flange portion 3 in the above is regulated.

このように、ドラム１の組立ての過程であって、（胴部２の延在方向において）胴部２の端部と、組立用係合部１１とが対向しているが、胴部２の端部と、組立用係合部１１との係合状態ではなく、第１胴部側リブ４３と、回動規制部２８とは対向してもいない状態（以下、「組立準備状態」と称する）においては、第１胴部側リブ４３の先端部４３ａが、第２内周リブ１６の裏面６側の端縁と当接することで、第１胴部側リブ４３や第２胴部側リブ４４が、組立用係合部１１の規制リブ２９や連結補強リブ３３と接触することが回避される。これにより、胴部２の端部と、組立用係合部１１とが対向する状態を保ったまま、鍔部３の裏面６に沿った胴部２の回動変位が許容される上、当該回動変位が、第１胴部側リブ４３と、回動規制部２８との位置が一致するまで案内される状態となる。尚、第２胴部側リブ４４については、切欠き部４５が設けられていることから、組立準備状態では、第２内周リブ１６の裏面５側の端縁と当接しない。 As described above, in the process of assembling the drum 1, the end portion of the body portion 2 (in the extending direction of the body portion 2) and the assembling engaging portion 11 face each other, but the body portion 2 The state in which the end portion is not engaged with the assembly engaging portion 11 and the first body portion side rib 43 and the rotation restricting portion 28 are not opposed to each other (hereinafter, referred to as "assembly ready state"). ), The tip 43a of the first body side rib 43 comes into contact with the edge of the second inner peripheral rib 16 on the back surface 6 side, so that the first body side rib 43 and the second body side rib It is avoided that the 44 comes into contact with the regulating rib 29 and the connecting reinforcing rib 33 of the assembling engaging portion 11. As a result, the rotational displacement of the body portion 2 along the back surface 6 of the collar portion 3 is allowed while maintaining the state in which the end portion of the body portion 2 and the assembly engaging portion 11 face each other. The rotational displacement is guided until the positions of the first body portion side rib 43 and the rotation restricting portion 28 coincide with each other. Since the second body side rib 44 is provided with the notch 45, it does not come into contact with the edge of the second inner peripheral rib 16 on the back surface 5 side in the assembly preparation state.

そして、第１胴部側リブ４３と、回動規制部２８との位置が一致することで、第１胴部側リブ４３の先端部４３ａと、第２内周リブ１６の裏面６側の端縁との当接状態が解消され、図９、図１０等に示すように、胴部２（本体部４１）の端部が組立用係合部１１と係合し、第１胴部側リブ４３の端部（を含む部位）が回動規制部２８と係合した状態とされる。また、第２胴部側リブ４４の先端部が、組立用係合部１１の連結部１７の連結内周部１７ａに当接し、第２胴部側リブ４４の切欠き部４５に第２内周リブ１６の裏面６側の端縁が挿入されるような格好で、第２内周リブ１６の裏面６側の端縁が、第２胴部側リブ４４の切欠き部４５に対応する部位に当接する。尚、ドラム１を組立状態とした場合に、胴部２の延在方向において胴部２と、鍔部３とが当接する部位は特に限定されるものではないが、組立状態の安定化を図るべく、第２胴部側リブ４４の端部、及び、本体部４１の端部のうち少なくとも一方が、胴部２の延在方向において鍔部３（第２内周リブ１６、及び、連結部１７）と当接するように構成することが望ましい。加えて、例えば、ドラム１を組立状態とした場合に、第２胴部側リブ４４に対して、連結内周部１７ａ、及び、第２内周リブ１６の裏面６側の端縁のうち一方、又は、両方が当接しない構成としてもよいし、第１胴部側リブ４３の先端部４３ａがボルト挿通部２７の周縁部分に当接するように構成してもよい。 Then, when the positions of the first body portion side rib 43 and the rotation restricting portion 28 match, the tip portion 43a of the first body portion side rib 43 and the end of the second inner peripheral rib 16 on the back surface 6 side The contact state with the edge is eliminated, and as shown in FIGS. 9 and 10, the end portion of the body portion 2 (main body portion 41) engages with the assembly engaging portion 11, and the first body portion side rib It is assumed that the end portion (including the portion) of the 43 is engaged with the rotation restricting portion 28. Further, the tip end portion of the second body portion side rib 44 comes into contact with the connecting inner peripheral portion 17a of the connecting portion 17 of the assembling engaging portion 11, and the second inner portion is inserted into the notch portion 45 of the second body portion side rib 44. The end edge on the back surface 6 side of the peripheral rib 16 is inserted, and the edge on the back surface 6 side of the second inner peripheral rib 16 corresponds to the notch 45 of the second body side rib 44. Contact. When the drum 1 is in the assembled state, the portion where the body portion 2 and the flange portion 3 come into contact with each other in the extending direction of the body portion 2 is not particularly limited, but the assembled state is stabilized. Therefore, at least one of the end portion of the second body portion side rib 44 and the end portion of the main body portion 41 has a collar portion 3 (second inner peripheral rib 16 and a connecting portion) in the extending direction of the body portion 2. It is desirable to configure it so that it comes into contact with 17). In addition, for example, when the drum 1 is in the assembled state, one of the connecting inner peripheral portion 17a and the end edge of the second inner peripheral rib 16 on the back surface 6 side with respect to the second body side rib 44. Alternatively, both may be configured not to come into contact with each other, or the tip end portion 43a of the first body portion side rib 43 may be configured to come into contact with the peripheral edge portion of the bolt insertion portion 27.

さらに、第１胴部側リブ４３の端部（を含む部位）が回動規制部２８と係合することにより、図９〜図１１等に示すように、鍔部３のボルト挿通部２７と、一対の第１胴部側リブ４３の間の領域とが連通した状態となる。尚、図７に示すように、胴部２は、基本的には、胴部２の延在方向中央部、かつ、径方向の中央部を通り、胴部２の延在方向に対して直交する仮想直線を中心とする回転対称形状とされ（仕切り部４２の内周側の形状において異なるのみとされ）、胴部２のどちらの端部に対しても、鍔部３を同様に係合状態とすることができる。 Further, by engaging the end portion (including the portion) of the first body portion side rib 43 with the rotation restricting portion 28, as shown in FIGS. 9 to 11 and the like, the bolt insertion portion 27 of the flange portion 3 and the bolt insertion portion 27 , The region between the pair of first body side ribs 43 is in communication with each other. As shown in FIG. 7, the body portion 2 basically passes through the central portion in the extending direction of the body portion 2 and the central portion in the radial direction, and is orthogonal to the extending direction of the body portion 2. It has a rotationally symmetric shape centered on the virtual straight line (only different in the shape on the inner peripheral side of the partition portion 42), and the collar portion 3 is similarly engaged with either end of the body portion 2. Can be in a state.

胴部２の両端部に対して鍔部３を係合状態とした後、ボルト４を一方の鍔部３のボルト挿通部２７から胴部２のボルト貫通孔４６を介して他方の鍔部３のボルト挿通部２７にかけて挿通し、他方の鍔部３の表面７側に突出したボルト４の端部に対してナット５を締める。以上のようにして、図１に示すように、胴部２と、一対の鍔部３とが連結され、ドラム１が組立状態とされる。 After the collar 3 is engaged with both ends of the body 2, the bolt 4 is inserted from the bolt insertion portion 27 of one collar 3 through the bolt through hole 46 of the body 2 to the other collar 3. The nut 5 is inserted through the bolt insertion portion 27 of the above, and the nut 5 is tightened with respect to the end portion of the bolt 4 protruding toward the surface 7 side of the other flange portion 3. As described above, as shown in FIG. 1, the body portion 2 and the pair of collar portions 3 are connected, and the drum 1 is in the assembled state.

以上詳述したように、本実施形態によれば、鍔部３において、胴部２との組立状態を保持するための組立用係合部１１と、鍔部３同士を安定して積重ねる（段積みする）ための段積み用係合部１３との形成位置が胴部２の内外方向において異なっている（段積み用係合部１３が組立用係合部１１に対して鍔部３の内方側に離間して設けられている）。このため、鍔部３の段積み状態において段積み用係合部１３に作用した外力が組立用係合部１１には作用しない、又は、作用し難い構成とすることができる。従って、鍔部３を段積み状態として保管・運搬する際の組立用係合部１１へのダメージを飛躍的に低減させることができ、鍔部３を胴部２と組立てる段階で組立用係合部１１が既に変形したり疲労してしまったりしているといった事態を回避することができる。これにより、ドラム１の組立状態において組立用係合部１１が破損等を起こし易くなったり、ドラム１の組立作業時において組立用係合部１１の変形に起因して組立て難くなったりしてしまうといった懸念を払拭することができる。結果として、鍔部３同士を安定して（水平方向への位置ずれを生じさせることなく）段積み可能としつつ、ドラム１の組立状態の安定化、耐久性の向上等を図ることができ、ドラム１の破損等に起因する長尺物の損傷等のリスクを大幅に低減させることができる。 As described in detail above, according to the present embodiment, in the collar portion 3, the assembling engaging portion 11 for holding the assembled state with the body portion 2 and the collar portion 3 are stably stacked (the collar portion 3). The forming position with the stacking engaging portion 13 for stacking) is different in the inside and outside directions of the body portion 2 (the stacking engaging portion 13 is the flange portion 3 with respect to the assembly engaging portion 11. It is provided separately on the inner side). Therefore, the external force acting on the stacking engaging portion 13 in the stacked state of the flange portion 3 may not act on the assembling engaging portion 11 or may be difficult to act. Therefore, it is possible to dramatically reduce the damage to the assembly engaging portion 11 when the collar portion 3 is stored and transported in a stacked state, and the assembly engagement portion is assembled at the stage of assembling the collar portion 3 with the body portion 2. It is possible to avoid a situation in which the portion 11 is already deformed or tired. As a result, the assembling engaging portion 11 is likely to be damaged in the assembled state of the drum 1, or it becomes difficult to assemble due to the deformation of the assembling engaging portion 11 during the assembling work of the drum 1. It is possible to dispel such concerns. As a result, it is possible to stabilize the assembled state of the drum 1 and improve the durability while enabling the flanges 3 to be stacked stably (without causing a displacement in the horizontal direction). The risk of damage to a long object due to damage to the drum 1 can be significantly reduced.

また、段積み用係合部１３は、円環状に連続して設けられている。このため、鍔部３を段積みする場合の方向性がなくなり（裏面６を上向きとして鍔部３を段積みする場合に、鍔部３同士の相対的な向きを合わせなければ上側の鍔部３の凹部１２が、下側の鍔部３の段積み用係合部１３と係合しないといった事態が回避され）、鍔部３を段積みする際の作業性の向上や、凹部１２と段積み用係合部１３とが確実に係合されていない状態のまま鍔部３が積重ねられるといった作業ミスの抑制等を図ることができる。また、段積み用係合部１３の強度や剛性を高めることができ、段積み用係合部１３の破損等を抑制し、鍔部３の段積み状態の安定化等を図ることができる。 Further, the stacking engaging portion 13 is continuously provided in an annular shape. For this reason, there is no directionality when stacking the collar portions 3 (when stacking the collar portions 3 with the back surface 6 facing upward, if the relative orientations of the collar portions 3 are not matched, the upper collar portion 3 is used. The recess 12 does not engage with the stacking engaging portion 13 of the lower flange portion 3), the workability when stacking the flange portion 3 is improved, and the recess 12 and the recess 12 are stacked. It is possible to suppress work mistakes such as stacking the collar portions 3 while the engagement portion 13 is not securely engaged. In addition, the strength and rigidity of the stacking engaging portion 13 can be increased, damage to the stacking engaging portion 13 can be suppressed, and the stacking state of the flange portion 3 can be stabilized.

さらに、裏面６を上向きとして鍔部３を段積みした場合に、下側の鍔部３の裏面６のうち組立用係合部１１よりも外方側の範囲、すなわち、巻回された長尺物と対向し得る範囲が、上側の鍔部３から離間するように構成されている。従って、鍔部３の段積み状態において、鍔部３の裏面のうち長尺物と対向し得る範囲が、他の鍔部３と接触して変形したり破損したりするといった事態を回避することができ、結果として、胴部２に巻回された長尺物が、破損等した鍔部３に接触する等して損傷する等の事態を防止することができる。 Further, when the collar portions 3 are stacked with the back surface 6 facing upward, the range of the back surface 6 of the lower collar portion 3 on the outer side of the assembly engaging portion 11, that is, the wound long length. The range that can face the object is configured to be separated from the upper flange portion 3. Therefore, in the stacked state of the collar portion 3, it is necessary to avoid a situation in which the range of the back surface of the collar portion 3 that can face a long object is deformed or damaged in contact with another collar portion 3. As a result, it is possible to prevent a situation in which a long object wound around the body portion 2 is damaged due to contact with a damaged collar portion 3 or the like.

また、鍔部３の表面７には、凹部１２を跨ぐようにしてシボ加工が施された機能部２６が設けられている。このため、シボ加工（微細突部又は微細凹部）が施された機能部２６にラベルを貼着することで、ラベルを剥がし易くすることができる。さらに、機能部２６が凹部１２を跨いで設けられることでラベルを貼着する面積を極力広く確保することができる上、ラベルを剥がす際に凹部１２を介してラベルの裏側に指先等を掛けることができ、作業を行い易くすることができる。さらに、機能部２６は、機能部２６を囲うようにして設けられている第１内周リブ１５の表面７側の端縁よりも鍔部３の厚み方向中央部側に位置している。このため、機能部２６に貼着されたラベルが建物の壁部等に接触する等の事態を抑止することができる。従って、ラベルの保護を図ることができ、ラベルが読み取り難くなる等の懸念を抑制することができる。 Further, on the surface 7 of the flange portion 3, a functional portion 26 that has been textured so as to straddle the recess 12 is provided. Therefore, the label can be easily peeled off by attaching the label to the functional portion 26 that has been textured (fine protrusions or fine recesses). Further, since the functional portion 26 is provided so as to straddle the recess 12, the area for attaching the label can be secured as wide as possible, and when the label is peeled off, the fingertip or the like is hung on the back side of the label via the recess 12. It is possible to make the work easier. Further, the functional portion 26 is located closer to the central portion in the thickness direction of the flange portion 3 than the edge on the surface 7 side of the first inner peripheral rib 15 provided so as to surround the functional portion 26. Therefore, it is possible to prevent a situation in which the label attached to the functional portion 26 comes into contact with the wall portion of the building or the like. Therefore, the label can be protected, and the concern that the label becomes difficult to read can be suppressed.

尚、上記実施形態の記載内容に限定されず、例えば次のように実施してもよい。勿論、以下において例示しない他の応用例、変更例も当然可能である。 The content is not limited to the description of the above embodiment, and may be implemented as follows, for example. Of course, other application examples and modification examples not illustrated below are also possible.

（ａ）上記実施形態では、胴部２は略円筒状に構成されているが、略四角筒状等の角部を有する形状としてもよい。また、胴部２の内側の構成についても特に限定されるものではなく、組立用係合部１１と係合可能な端部を備えるとともに、ボルト４等を使用して鍔部３と連結可能な形状をなしていればよい。例えば、組立準備状態を維持しつつ鍔部３の裏面６に沿って胴部２を相対的に回動変位可能な構成を省略することも可能である。尚、胴部２の長さや太さについても適宜変更可能であるが、胴部２（本体部４１）の長さが短い場合であっても、胴部２（本体部４１）の延在方向は、内側の空間が貫通している方向とする。また、第１胴部側リブ４３、及び、第２胴部側リブ４４は、胴部２（本体部４１）の延在方向のほぼ全体に延在するようにして設けられているが、少なくとも胴部２の両端部又はその近傍に設けられていればよい。 (A) In the above embodiment, the body portion 2 is formed in a substantially cylindrical shape, but may have a shape having corner portions such as a substantially square cylinder shape. Further, the inner configuration of the body portion 2 is not particularly limited, and the end portion that can be engaged with the assembling engaging portion 11 is provided, and the flange portion 3 can be connected by using a bolt 4 or the like. It suffices to have a shape. For example, it is possible to omit a configuration in which the body portion 2 can be relatively rotationally displaced along the back surface 6 of the collar portion 3 while maintaining the assembly ready state. The length and thickness of the body portion 2 can be changed as appropriate, but even if the length of the body portion 2 (main body portion 41) is short, the extending direction of the body portion 2 (main body portion 41) Is the direction in which the inner space penetrates. Further, the first body portion side rib 43 and the second body portion side rib 44 are provided so as to extend substantially in the extending direction of the body portion 2 (main body portion 41), but at least. It suffices if it is provided at or near both ends of the body portion 2.

（ｂ）上記実施形態では、鍔部３は略円盤状に構成されているが、組立用係合部１１を備えて胴部２と連結可能であり、凹部１２、及び、段積み用係合部１３を備えて鍔部３同士で段積み可能であり、胴部２に巻回された長尺物を（極力）接地させずにドラム１を支持可能に構成されていればよい。例えば、略四角筒状等の角部を有する形状としてもよい。 (B) In the above embodiment, the flange portion 3 is formed in a substantially disk shape, but the flange portion 3 is provided with an assembly engaging portion 11 and can be connected to the body portion 2, and the recess 12 and the stacking engagement are provided. It suffices that the portion 13 is provided and the flange portions 3 can be stacked with each other, and the drum 1 can be supported without (as much as possible) grounding a long object wound around the body portion 2. For example, it may have a shape having corners such as a substantially square tubular shape.

また、段積み用係合部１３の形成位置は、鍔部３の裏面６において特に限定されるものではないが、ドラム１に巻回される長尺物と干渉することのないように組立用係合部１１よりも鍔部３の内方側に設けられることが望ましい。さらに、段積み用係合部１３は、円環状に連続して設けられているが、部分的に欠けているような形状（或いは、円形の仮想のライン上に点在するような形状）としてもよいし、角部を有する環状としてもよい。但し、円環状とすることで、組立作業性の向上を図ることができ、環状の全周にわたって連続して設けられることで耐久性の向上等を図ることができる。 Further, the forming position of the stacking engaging portion 13 is not particularly limited on the back surface 6 of the flange portion 3, but is for assembly so as not to interfere with a long object wound around the drum 1. It is desirable that the flange portion 3 is provided on the inner side of the flange portion 3 with respect to the engaging portion 11. Further, the stacking engaging portions 13 are continuously provided in an annular shape, but have a shape that is partially missing (or a shape that is scattered on a circular virtual line). It may be an annular shape having corners. However, the annular shape can improve the assembly workability, and the annular shape can be continuously provided over the entire circumference of the ring to improve the durability.

（ｃ）加えて、上記実施形態では、基板部１４の裏面６（第１内周リブ１５の裏面６側の端縁）が、第２内周リブ１６の裏面６側の端縁よりも鍔部３の厚み方向の中央部側に位置しており、裏面６を上向きとして鍔部３を段積みした場合に、下側の鍔部３の裏面６のうち組立用係合部１１よりも外方側の範囲である基板部１４が、上側の鍔部３から離間するように構成されているが、特にかかる構成に限定されるものではない。例えば、鍔部３の厚み方向において、基板部１４の裏面６（第１内周リブ１５の裏面６側の端縁）と、第２内周リブ１６の裏面６側の端縁とが同じ位置であり、かつ、第１内周リブ１５、外周リブ２４、及び、外周側補強リブ２５の表面７側の端縁が、第２内周リブ１６等の表面７側の端縁よりも鍔部３の厚み方向中央部側に位置するように構成することで、裏面６を上向きとして鍔部３を段積みした場合に、下側の鍔部３の裏面６のうち組立用係合部１１よりも外方側の範囲である基板部１４が、上側の鍔部３から離間するように構成してもよい。 (C) In addition, in the above embodiment, the back surface 6 of the substrate portion 14 (the edge of the first inner peripheral rib 15 on the back surface 6 side) is brim than the edge of the second inner peripheral rib 16 on the back surface 6 side. It is located on the central portion side in the thickness direction of the portion 3, and when the flange portions 3 are stacked with the back surface 6 facing upward, the back surface 6 of the lower flange portion 3 is outside the engaging portion 11 for assembly. The substrate portion 14, which is a range on the side side, is configured to be separated from the upper flange portion 3, but is not particularly limited to such a configuration. For example, in the thickness direction of the flange portion 3, the back surface 6 of the substrate portion 14 (the edge of the first inner peripheral rib 15 on the back surface 6 side) and the edge of the second inner peripheral rib 16 on the back surface 6 side are at the same position. The edge of the first inner peripheral rib 15, the outer peripheral rib 24, and the outer peripheral side reinforcing rib 25 on the surface 7 side is a collar portion of the edge of the second inner peripheral rib 16 and the like on the surface 7 side. By configuring the third portion 3 so as to be located on the central portion side in the thickness direction, when the flange portions 3 are stacked with the back surface 6 facing upward, from the assembling engaging portion 11 of the back surface 6 of the lower flange portion 3. The substrate portion 14, which is in the outer range, may be configured to be separated from the upper flange portion 3.

また、例えば、裏面６を上向きとして鍔部３を段積みした場合に、下側の鍔部３の裏面６のうち組立用係合部１１よりも外方側の範囲である基板部１４が、上側の鍔部３と当接するように構成してもよい。但し、鍔部３の段積み状態において、基板部１４の裏面６側の面が別の鍔部３と当接しないように構成することで、鍔部３を段積み状態として運搬・保管している際の基板部１４の裏面６側の面の損傷を防止することができる。ここで、「鍔部３の段積み状態において、基板部１４の裏面６側の面が別の鍔部３と当接しない」とは、鍔部３の段積み状態において（段積み作業や段積み状態を解消する作業中は除く）、段積みされた鍔部３に対して、運搬や保管に際して通常に付加され得る力（積重ねられた鍔部３の荷重等）以外の力が加えられなければ、基板部１４の裏面６側の面が別の鍔部３と当接しないという趣旨であり、段積みされた鍔部３が（外力が加えられる等して）変形したり、別の鍔部３に対して相対変位（段積み状態が解消）したりすれば当接し得るような構成についても含まれる。 Further, for example, when the flange portions 3 are stacked with the back surface 6 facing upward, the substrate portion 14 of the back surface 6 of the lower flange portion 3 which is on the outer side of the assembly engaging portion 11 It may be configured to come into contact with the upper flange portion 3. However, in the stacked state of the collar portion 3, the collar portion 3 is transported and stored in the stacked state by configuring the surface of the substrate portion 14 on the back surface 6 side so as not to come into contact with another collar portion 3. It is possible to prevent damage to the surface of the substrate portion 14 on the back surface 6 side during the operation. Here, "in the stacked state of the collar portion 3, the surface of the substrate portion 14 on the back surface 6 side does not come into contact with another collar portion 3" means that in the stacked state of the collar portion 3 (stacking work or step). A force other than the force normally applied during transportation and storage (such as the load of the stacked collars 3) must be applied to the stacked collars 3 (except during work to eliminate the stacked condition). For example, it means that the surface of the substrate portion 14 on the back surface 6 side does not come into contact with another flange portion 3, and the stacked collar portions 3 may be deformed (by applying an external force or the like) or another collar portion 3 may be deformed. It also includes a configuration in which a contact can be made if the relative displacement (the stacked state is eliminated) with respect to the portion 3.

尚、裏面６を上向きとして鍔部３を段積みすることで、基板部１４の裏面６が設置面に接地して損傷する等の事態を回避することができ、鍔部３の厚み方向において、第１内周リブ１５、外周リブ２４、及び、外周側補強リブ２５の表面７側の端縁と、第２内周リブ１６等の表面７側の端縁とを同じ位置とすることで、裏面６を上向きとして鍔部３を段積みした状態の安定化等を図ることができる。 By stacking the collar portions 3 with the back surface 6 facing upward, it is possible to avoid a situation in which the back surface 6 of the substrate portion 14 touches the installation surface and is damaged. By setting the edge of the first inner peripheral rib 15, the outer peripheral rib 24, and the outer peripheral side reinforcing rib 25 on the surface 7 side and the edge of the second inner peripheral rib 16 and the like on the surface 7 side at the same position, It is possible to stabilize the state in which the flange portions 3 are stacked with the back surface 6 facing upward.

（ｄ）また、鍔部３（中央板部１８）の表面７側には、凹部１２を跨ぐようにしてシボ加工が施された機能部２６が設けられているが、シボ加工を施さない構成としてもよいし、鍔部３の厚み方向において、中央板部１８の表面７側の位置を、第１内周リブ１５の裏面６側の端部と同じ位置（面一）としてもよい。但し、機能部２６を備えることで、ラベルを貼着したり剥がしたりする際の利便性の向上を図ることができ、機能部２６よりも鍔部３の厚み方向の外方にまで突出する部位を機能部２６に対して鍔部３の内外方向の外方側に囲むようにして設けることで、機能部２６に貼着されたラベルの保護を図ることができる。尚、鍔部３の厚み方向において、第２内周リブ１６の表面７側の端縁を、第１内周リブ１５の表面７側の端縁と同じ位置とし、中央板部１８は第２内周リブ１６の表面７側の端縁よりも若干鍔部３の中央部側に変位した部位の間を連結するようにして設けられる構成としてもよい。 (D) Further, on the surface 7 side of the flange portion 3 (central plate portion 18), a functional portion 26 that has been textured so as to straddle the recess 12 is provided, but is not textured. Alternatively, the position of the central plate portion 18 on the front surface 7 side may be the same as the end portion of the first inner peripheral rib 15 on the back surface 6 side (surface flush) in the thickness direction of the collar portion 3. However, by providing the functional portion 26, it is possible to improve the convenience when attaching or detaching the label, and the portion protruding outward from the functional portion 26 in the thickness direction of the collar portion 3 Is provided so as to surround the functional portion 26 on the outer side in the inner and outer directions of the collar portion 3, so that the label attached to the functional portion 26 can be protected. In the thickness direction of the flange portion 3, the edge of the second inner peripheral rib 16 on the surface 7 side is set at the same position as the edge of the first inner peripheral rib 15 on the surface 7 side, and the central plate portion 18 is the second. The inner peripheral rib 16 may be provided so as to connect between the portions displaced slightly toward the central portion of the collar portion 3 from the edge on the surface 7 side.

（ｅ）上記実施形態では、胴部２、及び、鍔部３はポリプロピレンにより構成されているが、ポリエチレン、ＰＥＴ、ポリアミド等その他の樹脂材料により構成されることとしてもよい。また、ドラム１に巻回されて保管される長尺物についても特に限定されるものではなく、胴部２に巻回可能なものであればよい。 (E) In the above embodiment, the body portion 2 and the collar portion 3 are made of polypropylene, but may be made of other resin materials such as polyethylene, PET, and polyamide. Further, the long object wound around the drum 1 and stored is not particularly limited as long as it can be wound around the body 2.

１…ドラム、２…胴部、３…鍔部、６…裏面、７…表面、１１…組立用係合部、１２…凹部、１３…段積み用係合部、１５…第１内周リブ、１６…第２内周リブ、１７…連結部、２６…機能部、２８…回動規制部、４１…本体部、４３…第１胴部側リブ、４３ａ…先端部、４４…第２胴部側リブ。 1 ... drum, 2 ... body, 3 ... collar, 6 ... back, 7 ... front, 11 ... assembly engagement, 12 ... recess, 13 ... stacking engagement, 15 ... first inner rib , 16 ... 2nd inner peripheral rib, 17 ... connecting part, 26 ... functional part, 28 ... rotation restricting part, 41 ... main body part, 43 ... first body side rib, 43a ... tip part, 44 ... second body Part side rib.

Claims

It is provided with a substantially tubular body portion and flange portions provided at both ends of the body portion and projecting outward from the outer peripheral surface of the body portion, so that a long object can be wound around the body portion. In a drum in which the body portion and the collar portion are separately formed, and the body portion and the pair of the collar portions are assembled.
On the back surface of the collar portion facing the body portion,
An assembly engaging portion that engages with the end of the body portion in the assembled state of the drum,
When the collar portions are directly stacked with the back surface facing upward, a stacking engaging portion that engages with a recess provided on the surface of the upper collar portion opposite to the back surface is provided. ,
The drum is characterized in that the stacking engaging portion is provided at a position different from that of the assembling engaging portion in the inner and outer directions of the body portion.

The drum according to claim 1, wherein the stacking engaging portion is continuously provided in an annular shape.

When the collar portions are directly stacked with the back surface facing upward, the range of the back surface of the lower collar portion on the outer side of the assembly engaging portion is separated from the upper collar portion. The drum according to claim 1 or 2, wherein the drum is configured as such.

On the surface of the collar portion, a functional portion that has been textured so as to straddle the recess is provided.
The drum according to any one of claims 1 to 3, wherein the collar portion is provided with a portion on the surface side that protrudes in the thickness direction of the collar portion from the functional portion.