WO2020195947A1 - Protective equipment and metal tube with protective equipment - Google Patents

Protective equipment and metal tube with protective equipment Download PDF

Info

Publication number
WO2020195947A1
WO2020195947A1 PCT/JP2020/011078 JP2020011078W WO2020195947A1 WO 2020195947 A1 WO2020195947 A1 WO 2020195947A1 JP 2020011078 W JP2020011078 W JP 2020011078W WO 2020195947 A1 WO2020195947 A1 WO 2020195947A1
Authority
WO
WIPO (PCT)
Prior art keywords
fin
axial direction
tubular portion
protective
metal tube
Prior art date
Application number
PCT/JP2020/011078
Other languages
French (fr)
Japanese (ja)
Inventor
俊雄 餅月
美紀子 野口
哲也 ▲高▼梨
大介 元家
健太郎 駒井
Original Assignee
日本製鉄株式会社
扶容高圧株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本製鉄株式会社, 扶容高圧株式会社 filed Critical 日本製鉄株式会社
Publication of WO2020195947A1 publication Critical patent/WO2020195947A1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D59/00—Plugs, sleeves, caps, or like rigid or semi-rigid elements for protecting parts of articles or for bundling articles, e.g. protectors for screw-threads, end caps for tubes or for bundling rod-shaped articles
    • B65D59/02—Plugs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling

Definitions

  • the present invention relates to a protective device that protects the end of the metal pipe and a metal pipe provided with the protective device.
  • protective equipment When storing and transporting metal pipes used in line pipes, etc., protective equipment may be attached to the ends of the metal pipes in order to protect the end faces of the metal pipes.
  • a protective device for example, as disclosed in Patent Document 1, a tubular body and a protective device having a disk provided at one end of the tubular body are used.
  • the outer diameter of the tubular body is set to be smaller than the inner diameter of the metal tube, and the disk is set to be larger than the inner diameter of the metal tube.
  • This protective device is attached to the metal tube so as to cover the end face of the metal tube with a disk while inserting the tubular body into the metal tube. Thereby, the end face of the metal pipe can be protected.
  • an object of the present invention is to provide a protective device capable of protecting the end portion in a state where a hook can be hooked on the end portion of the metal tube, and a metal tube provided with the protective device.
  • the gist of the present invention is the following protective equipment and a metal tube with protective equipment.
  • a protective device attached to the end of a metal tube.
  • a tubular portion extending in one direction from the inner edge portion of the flange portion and An annular and plate-shaped first fin that protrudes from the outer peripheral surface of the tubular portion in a direction intersecting the axial direction of the tubular portion and is provided apart from the flange portion in the axial direction. It is provided between the first fin and the flange portion so as to project from the outer peripheral surface of the tubular portion in a direction intersecting the axial direction and to be separated from the first fin and the flange portion in the axial direction.
  • An annular and plate-shaped second fin Protective equipment with.
  • the heights of the first fin and the second fin are set to 1/2 or more of the height of the flange portion in the direction orthogonal to the axial direction of the tubular portion (1). ) ).
  • the outer peripheral surface of the tubular portion has a circular shape in a cross section perpendicular to the axial direction.
  • the protective device according to any one of (1) to (4) above, wherein the distance H between the flange portion and the first fin in the axial direction is defined by the following formula (1).
  • A indicates the outer diameter of the tubular portion.
  • the first fin has a tapered shape in which the peripheral length of the outer edge in the cross section perpendicular to the axial direction increases as it approaches the flange portion in the axial direction, from (1) to (5) above.
  • the flange portion includes a protective surface having a ring shape when viewed from the first fin side in the axial direction.
  • the protective surface has a tapered shape in which the peripheral length in a cross section perpendicular to the axial direction increases as the peripheral length approaches the first fin in the axial direction, according to any one of (1) to (6) above.
  • Protective equipment is any one of (1) to (6) above.
  • the height of the first fin is set to be less than the distance between the first fin and the second fin in the axial direction in the direction orthogonal to the axial direction of the tubular portion.
  • the height of the second fin is set to be less than the distance between the second fin and the flange portion in the axial direction in the direction orthogonal to the axial direction of the tubular portion (1).
  • the outer peripheral surface of the tubular portion has a circular shape in a cross section perpendicular to the axial direction.
  • the protective device-equipped metal pipe according to (16) above, wherein the distance H between the flange portion and the first fin in the axial direction is defined by the following formula (2).
  • D indicates the inner diameter of the metal pipe
  • A indicates the outer diameter of the tubular portion.
  • the end portion can be protected in a state where the hook can be hooked on the end portion of the metal tube.
  • FIG. 10 is a diagram showing a metal tube with a protective device according to an embodiment of the present invention.
  • FIG. 11 is a diagram showing a protective device according to another embodiment of the present invention.
  • FIG. 12 is a diagram showing a protective device according to another embodiment of the present invention.
  • FIG. 13 is a diagram showing a protective device according to still another embodiment of the present invention.
  • FIG. 14 is a diagram showing a modified example of the protective equipment.
  • the present inventors have conducted various studies on the configuration of a protective device capable of protecting the end portion of the metal tube in a state where the hook can be hooked on the end portion. Specifically, the present inventors first examined in detail the configuration of the protective device disclosed in Patent Document 1.
  • FIG. 1 is a diagram showing a protective device having the same configuration as the protective device disclosed in Patent Document 1. Specifically, FIG. 1A is a front view of the protective equipment, and FIG. 1B is a cross-sectional view showing a portion bb of FIG. 1A.
  • the protective tool 100 shown in FIG. 1 includes a tubular body 102, a disk 104 provided at one end of the tubular body 102, and four locking members 106 provided on the outer peripheral surface of the tubular body 102. ing.
  • FIG. 2 is a diagram showing a usage state of the protective device 100 shown in FIG.
  • the present inventors have improved the above-mentioned protective equipment 100 in order to enable the hook to be hooked on the end of the metal tube 1 while exhibiting the above-mentioned effects of the protective equipment. Specifically, it was examined to attach the protective device 100a shown in FIG. 3 to the metal tube 1.
  • the protective tool 100a shown in FIG. 3 is different from the protective tool 100 shown in FIGS. 1 and 2 in that it has a hollow disk-shaped flange portion 104a instead of the disk 104.
  • the hook 200 can be inserted into the tubular body 102. As a result, the metal pipe 1 can be lifted by the hook 200 while preventing damage to the end portion of the metal pipe 1.
  • the plurality of locking members 106 are provided so as to be separated from each other in the circumferential direction of the tubular body 102. Therefore, the locking member 106 is not provided on the outer surface of the four regions 102a shown by the dotted lines in the tubular body 102.
  • the hook 200 is hooked on the inner surface of the region of the tubular body 102 where the locking member 106 is provided when the metal tube 1 is lifted, the locking member The 106 is pressed against the inner surface 1a of the metal tube 1 with sufficient force. In this case, a frictional force can be generated between the inner surface 1a of the metal tube 1 and the locking member 106. As a result, it is possible to prevent the protective device 100a from falling out of the metal tube 1.
  • FIG. 4 is a front view of the protective device 100b.
  • the protective tool 100b shown in FIG. 4 is different from the protective tool 100a shown in FIG. 3 in that instead of the four locking members 106, a hollow disk provided so as to cover the entire circumference of the tubular body 102. It is a point that has a shaped locking member 106a.
  • the protective tool 100b When the protective tool 100b is used, when the metal tube 1 (see FIG. 3) is lifted by the hook 200 (see FIG. 3), the hook 200 is inserted regardless of the insertion position (position in the circumferential direction of the tubular body 102). , The locking member 106a can be pressed against the inner surface 1a of the metal tube 1. That is, a frictional force can be generated between the inner surface 1a of the metal tube 1 and the locking member 106a regardless of the insertion position of the hook 200.
  • the protective device 100b may fall out from the metal tube 1. It was also found that the protective tool 100b may come off when the metal tube 1 is conveyed with the protective tool 100b attached.
  • FIGS. 8 to 10 show a cross section of the metal tube and the protective tool obtained by dividing the metal tube and the protective tool into two equal parts when viewed from the axial direction of the metal tube.
  • the protective tool 10 has a hollow and annular flange portion 12, a tubular portion 14 extending in one direction from the inner edge portion of the flange portion 12, and a tubular portion.
  • a plurality of annular and plate-shaped fins 16 and 18 projecting from the outer peripheral surface of the portion 14 and a disk-shaped bottom portion 20 are provided.
  • the fin 16 corresponds to the first fin
  • the fin 18 corresponds to the second fin.
  • the axial direction of the tubular portion 14 is indicated by the arrow of the alternate long and short dash line.
  • the flange portion 12, the fin 16, and the fin 18 each have an annular shape. Further, the flange portion 12, the fin 16 and the fin 18 are provided so as to be separated from each other in the axial direction of the tubular portion 14.
  • the outer diameter of the flange portion 12 is larger than the inner diameter of the metal pipe 1 (see FIG. 8).
  • the flange portion 12 includes a protective surface 12a having a ring shape when viewed from the fin 16 side in the axial direction of the tubular portion 14.
  • the outer peripheral surface of the tubular portion 14 has a circular shape in a cross section perpendicular to the axial direction of the tubular portion 14.
  • the tubular portion 14 has a cylindrical shape.
  • the flange portion 12 is provided at one end of the tubular portion 14 in the axial direction of the tubular portion 14.
  • One end of the tubular portion 14 is open so that the hook 200 (see FIG. 9) can be inserted.
  • the fins 16 are provided on the other end side of the center of the tubular portion 14 in the axial direction of the tubular portion 14.
  • the fin 18 is provided between the flange portion 12 and the fin 16 in the axial direction of the tubular portion 14. In the present embodiment, the fin 18 is provided, for example, on the midpoint between the flange portion 12 and the fin 16 in the axial direction of the tubular portion 14.
  • the bottom portion 20 is provided so as to close the other end side of the tubular portion 14 in the axial direction of the tubular portion 14.
  • a through hole 20a is formed in the central portion of the bottom portion 20.
  • the through hole 20a functions as a vent hole. Further, the operator can easily remove the protective tool 10 from the metal tube 1 by inserting a finger or a jig into the through hole 20a.
  • two or more through holes may be formed in the bottom portion 20.
  • the tubular portion 14 has a continuous tubular shape from one end to the other end in the axial direction.
  • the tubular portion 14 has a continuous inner surface from one end to the other end in the axial direction.
  • the fins 16 and 18 are provided so as to project from the outer peripheral surface of the tubular portion 14 in a direction intersecting the axial direction of the tubular portion 14, respectively. That is, in the present embodiment, the fins 16 and 18 are formed separately from the tubular portion 14 instead of deforming a part of the tubular portion 14 to form the fins 16 and 18.
  • the fins 16 and 18 each project from the outer peripheral surface of the tubular portion 14 in the radial direction of the tubular portion 14.
  • the diameter of the circle circumscribing the fin 16 and the diameter of the circle circumscribing the fin 18 are each larger than the inner diameter of the metal tube 1.
  • the outer diameters of the fins 16 and 18 are larger than the inner diameter of the metal tube 1.
  • the heights of the fins 16 and 18 are set to, for example, 1/2 or more of the height of the flange portion 12 in the direction orthogonal to the axial direction of the tubular portion 14. Further, in the present embodiment, the height of the fin 16 is set to be less than, for example, the distance between the fin 16 and the fin 18 in the axial direction of the tubular portion 14. Further, the height of the fin 18 is set to be less than the distance between the fin 18 and the flange portion 12 in the axial direction of the tubular portion 14, for example.
  • the fin height means the distance from the outer peripheral surface of the tubular portion to the outer edge of the fin in the direction orthogonal to the axial direction of the tubular portion. Further, the height of the flange portion means a distance from the outer peripheral surface of the tubular portion to the outer edge of the flange portion in a direction orthogonal to the axial direction of the tubular portion.
  • the heights of the fins 16 and 18 preferably satisfy the following equations (3) and (4).
  • f indicates the height of the fin
  • D indicates the inner diameter of the metal tube to which the protective equipment is mounted
  • A indicates the outer diameter of the tubular portion.
  • the protective device 10 is formed of a resin material such as polyethylene. Further, the thicknesses of the fins 16 and 18, respectively, are set so that the fins 16 and 18 have flexibility, respectively. Specifically, the thicknesses of the fins 16 and 18 are set to, for example, about 1 to 4 mm. The thickness of the flange portion 12 is set to, for example, about 1 to 15 mm, and the thickness of the tubular portion 14 is set to, for example, about 1 to 5 mm.
  • T (DA) / 2 ... (5)
  • T indicates the distance between the inner surface of the metal pipe and the outer peripheral surface of the tubular portion
  • D indicates the inner diameter of the metal pipe
  • A indicates the outer diameter of the tubular portion.
  • the hook 200 is inserted into the tubular portion 14. In that state, the metal tube 1 is lifted by pulling up the hook 200. At this time, of the fins 16 and 18, the portion pressed against the inner surface 1a of the metal tube 1 by the hook 200 is deformed so as to be crushed, but the shape of the portion separated from the inner surface 1a is temporarily maintained.
  • FIG. 10 is a diagram for explaining a phenomenon that occurs when the hook 200 is removed from the protective device 10. As shown in FIG. 9, when the hook 200 is hooked on the protective device 10 to lift the metal tube 1, a part of the fins 16 and 18 is deformed so as to be crushed. If the hook 200 is removed from the protective device 10 with the fins 16 and 18 deformed in this way, the protective device 10 may tilt with respect to the metal tube 1 as shown in FIG.
  • the position P1 and the position P1 The distance X from the position P2 can be considered to be substantially equal to the distance Y between the position P3 and the position P4 shown in FIG.
  • the position P3 is a pair of boundaries between the protective surface 12a and the outer peripheral surface of the tubular portion 14 in a cross section obtained by dividing the metal tube 1 and the protective tool 10 into two equal parts when viewed from the axial direction of the tubular portion 14. Indicates the position of the boundary of one of the parts.
  • the distance Y is set to be equal to or larger than the inner diameter D of the metal tube 1.
  • the distance Y can be expressed by the following equation (6) using the outer diameter A of the tubular portion 14 and the above-mentioned distances T and H.
  • Y (H 2 + (A + T) 2 ) 1/2 ... (6)
  • the distance Y is set to be equal to or larger than the inner diameter D of the metal tube 1. Therefore, the above equation (7) can be modified as the following equation (8). D ⁇ (H 2 + ((A + D) / 2) 2 ) 1/2 ... (8)
  • the distance H can be expressed by the following equation (2). H ⁇ (D 2 -((A + D) / 2) 2 ) 1/2 ... (2)
  • the outer diameter A of the tubular portion 14 of the protective tool 10 is set to, for example, 0.85 times or more and less than the inner diameter D of the inner diameter D of the metal tube 1.
  • equation (2) can be modified as the following equation (1). H ⁇ 0.447A ⁇ ⁇ ⁇ (1)
  • the length of the tubular portion 14 in the axial direction is sufficiently long.
  • the distance between the other end of the tubular portion 14 (the end opposite to the flange portion 12) and the fin 16 is set to, for example, 10 mm or more.
  • the hook 200 can be inserted into the tubular portion 14 from the inside of the flange portion 12 as described above, so that the end portion of the metal tube 1 can be inserted. The end can be protected so that the hook 200 can be hooked on the hook 200.
  • the fins 16 and the fins 18 are provided over the entire circumference of the tubular portion 14, respectively.
  • the fins 16 and 18 are appropriately pressed against the inner surface 1a of the metal pipe 1 regardless of the insertion position of the hook 200 (the position in the circumferential direction of the tubular portion 14). be able to.
  • the two fins 16 and 18 can be brought into contact with the inner surface 1a of the metal tube 1 at the same time. As a result, a sufficient frictional force can be generated between the metal tube 1 and the fins 16 and 18.
  • the fins 16 are provided on the other end side (opposite side of the flange portion 12) from the center of the tubular portion 14 in the axial direction of the tubular portion 14, and further, the flange portion 12 and the fins 16 are provided.
  • a fin 18 is provided between the and.
  • the heights of the fins 16 and 18 are set to 1/2 or more of the height of the flange portion 12. As a result, when the protective tool 10 is attached to the metal tube 1, the contact area between the inner surface 1a of the metal tube 1 and the fins 16 and 18 can be sufficiently secured. Further, in the present embodiment, the height of the fin 16 is set to be less than the distance between the fin 16 and the fin 18 in the axial direction of the tubular portion 14. Thereby, when the protective tool 10 is attached to the metal tube 1, it is possible to prevent the tip portion of the fin 16 from overlapping with the fin 18. As a result, the protective tool 10 can be smoothly inserted into the metal tube 1, and the fins 18 can be appropriately brought into contact with the inner surface 1a of the metal tube 1.
  • the height of the fin 18 is set to be less than the distance between the fin 18 and the flange portion 12 in the axial direction of the tubular portion 14.
  • the protective device 10 including the two fins 16 and 18 has been described, but the number of fins is not limited to two.
  • three fins may be provided.
  • a third fin 22 is provided between the fin 18 and the flange portion 12 in the axial direction of the tubular portion 14.
  • the fin at the position farthest from the flange portion in the axial direction of the tubular portion is set as the first fin, and the fin is designated as the first fin in the axial direction of the tubular portion.
  • Adjacent fins are referred to as second fins.
  • the fin 16 corresponds to the first fin and the fin 18 corresponds to the second fin.
  • the height of each fin is preferably set to 1/2 or more of the height of the flange portion.
  • the height of the first fin is preferably set to be less than the distance between the first fin and the second fin in the axial direction of the tubular portion.
  • each fin is provided so as to extend parallel to the direction orthogonal to the axial direction of the tubular portion 14, but the shape of the fin is not limited to the above-mentioned example.
  • the fin 16 at the position farthest from the flange portion 12 may have a tapered shape.
  • the fin 16 has an outer peripheral edge length in a cross section perpendicular to the axial direction of the tubular portion 14 increasing as it approaches the flange portion 12 in the axial direction of the tubular portion 14.
  • it has a tapered shape. Since the fin 16 has a tapered shape in this way, the tubular portion 14 can be easily inserted into the metal tube 1.
  • the protective surface 12a of the flange portion 12 is provided so as to extend parallel to the direction orthogonal to the axial direction of the tubular portion 14, but the shape of the flange portion is not limited to the above-mentioned example.
  • the protective surface 12a of the flange portion 12 may have a tapered shape.
  • the protective surface 12a has such that the peripheral length in the cross section perpendicular to the axial direction of the tubular portion 14 increases as it approaches the fin 16 in the axial direction of the tubular portion 14. It has a tapered shape. Since the protective surface 12a has a tapered shape in this way, even when the end surface 1b of the metal tube 1 is beveled, the end surface 1b can be appropriately protected by the protection surface 12a.
  • each fin may be provided over the entire circumference of the tubular portion. Therefore, for example, the fin 16 may be divided into a plurality of portions in the circumferential direction as in the protective tool 10d shown in FIG. Similarly, the fin 18 may be divided into a plurality of portions in the circumferential direction. Although not shown, the same applies to the fin 22 (see FIG. 11).
  • the tubular portion 14 is provided so as to extend in one direction from the flange portion 12, but another tubular portion extends from the flange portion 12 in the direction opposite to the tubular portion 14. May be further provided. Further, in the above-described embodiment, the tubular portion 14 is provided with the bottom portion 20 at the end portion opposite to the flange portion 12, but the protective tool may not have the bottom portion. Further, in the above-described embodiment, the heights of the fins are substantially the same, but the heights of the fins may be different from each other.
  • the end portion can be protected in a state where the hook can be hooked on the end portion of the metal tube.
  • Metal tube 1a Inner surface 1b End surface 10, 10a, 10b, 10c, 10d Protective tool 12 Flange part 12a Protective surface 14 Cylindrical part 16, 18, 22 Fin 20 Bottom 20a Through hole 100, 100a, 100b Protective tool 102 Cylindrical body 104 disk 104a Flange part 106, 106a Locking member 200 Hook

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
  • Buffer Packaging (AREA)

Abstract

Protective equipment 10 is provided with: an annular flange 12; a cylindrical part 14 extending from the inner edge of the flange 12 in one direction; an annular fin 16 projecting from the outer circumferential surface of the cylindrical part 14 in a direction intersecting with the axial direction of the cylindrical part 14; and a fin 18 projecting from the outer circumferential surface of the cylindrical part 14 in a direction intersecting with the axial direction, and provided between the fin 16 and the flange 12 in the axial direction.

Description

保護具および保護具付き金属管Protective equipment and metal tube with protective equipment
　本発明は、金属管の端部を保護する保護具およびそれを備えた金属管に関する。 The present invention relates to a protective device that protects the end of the metal pipe and a metal pipe provided with the protective device.
　ラインパイプ等において用いられる金属管を保管および搬送等する際には、金属管の端面を保護するために、金属管の端部に保護具が装着される場合がある。このような保護具としては、例えば特許文献１に開示されているように、筒状体および筒状体の一端に設けられた円板を有する保護具が利用されている。 When storing and transporting metal pipes used in line pipes, etc., protective equipment may be attached to the ends of the metal pipes in order to protect the end faces of the metal pipes. As such a protective device, for example, as disclosed in Patent Document 1, a tubular body and a protective device having a disk provided at one end of the tubular body are used.
　特許文献１に開示された保護具では、筒状体の外径は、金属管の内径よりも小さく設定され、円板は、金属管の内径よりも大きく設定される。この保護具は、筒状体を金属管内に挿入しつつ金属管の端面を円板で覆うように金属管に装着される。これにより、金属管の端面を保護することができる。 In the protective equipment disclosed in Patent Document 1, the outer diameter of the tubular body is set to be smaller than the inner diameter of the metal tube, and the disk is set to be larger than the inner diameter of the metal tube. This protective device is attached to the metal tube so as to cover the end face of the metal tube with a disk while inserting the tubular body into the metal tube. Thereby, the end face of the metal pipe can be protected.
実開平７－２５３９５号公報Jikkenhei 7-25395
　ところで、クレーン等によって金属管を搬送する際には、金属管の両端部にフックを引っかけて、金属管が吊り上げられる。金属管の両端部の損傷を防止する観点からは、上記のような保護具を金属管に装着した状態で、金属管を吊り上げることが好ましい。しかしながら、特許文献１の保護具を金属管の両端部に装着した場合、金属管の両端部が円板によって塞がれる。このため、金属管の両端部にフックを引っかけることができない。 By the way, when transporting a metal pipe by a crane or the like, the metal pipe is lifted by hooking hooks on both ends of the metal pipe. From the viewpoint of preventing damage to both ends of the metal pipe, it is preferable to lift the metal pipe with the above-mentioned protective equipment attached to the metal pipe. However, when the protective equipment of Patent Document 1 is attached to both ends of the metal tube, both ends of the metal tube are closed by disks. Therefore, the hooks cannot be hooked on both ends of the metal tube.
　そこで、本発明は、金属管の端部にフックを引っかけることが可能な状態で該端部を保護することができる保護具およびその保護具を備えた金属管を提供することを目的としている。 Therefore, an object of the present invention is to provide a protective device capable of protecting the end portion in a state where a hook can be hooked on the end portion of the metal tube, and a metal tube provided with the protective device.
　本発明は、下記の保護具および保護具付き金属管を要旨とする。 The gist of the present invention is the following protective equipment and a metal tube with protective equipment.
（１）金属管の端部に装着される保護具であって、
　中空かつ環状のフランジ部と、
　前記フランジ部の内縁部から一方向に向かって延びる筒状部と、
　前記筒状部の外周面から前記筒状部の軸方向に交差する方向に突出し、かつ前記軸方向において前記フランジ部から離隔して設けられる環状かつ板状の第１フィンと、
　前記筒状部の外周面から前記軸方向に交差する方向に突出し、かつ前記軸方向において前記第１フィンおよび前記フランジ部から離隔するように前記第１フィンと前記フランジ部との間に設けられる環状かつ板状の第２フィンと、
を備えた保護具。 (1) A protective device attached to the end of a metal tube.
With a hollow and annular flange
A tubular portion extending in one direction from the inner edge portion of the flange portion and
An annular and plate-shaped first fin that protrudes from the outer peripheral surface of the tubular portion in a direction intersecting the axial direction of the tubular portion and is provided apart from the flange portion in the axial direction.
It is provided between the first fin and the flange portion so as to project from the outer peripheral surface of the tubular portion in a direction intersecting the axial direction and to be separated from the first fin and the flange portion in the axial direction. An annular and plate-shaped second fin,
Protective equipment with.
（２）前記筒状部の前記軸方向に直交する方向において、前記第１フィンおよび前記第２フィンの高さは、前記フランジ部の高さの１／２以上に設定される、上記（１）に記載の保護具。 (2) The heights of the first fin and the second fin are set to 1/2 or more of the height of the flange portion in the direction orthogonal to the axial direction of the tubular portion (1). ) ).
（３）前記筒状部の前記軸方向から見て、前記第１フィンに外接する円の直径および前記第２フィンに外接する円の直径は、前記金属管の内径よりも大きい、上記（１）または（２）に記載の保護具。 (3) The diameter of the circle circumscribing the first fin and the diameter of the circle circumscribing the second fin when viewed from the axial direction of the tubular portion are larger than the inner diameter of the metal tube (1). ) Or (2).
（４）前記筒状部の前記軸方向において、前記筒状部の一端に前記フランジ部が設けられ、前記筒状部の中心よりも他端側に前記第１フィンが設けられる、上記（１）から（３）のいずれかに記載の保護具。 (4) In the axial direction of the tubular portion, the flange portion is provided at one end of the tubular portion, and the first fin is provided at the other end side of the center of the tubular portion. ) To (3).
（５）前記筒状部の前記外周面は、前記軸方向に垂直な断面において円形状を有し、
　前記フランジ部と前記第１フィンとの前記軸方向における距離Ｈは、下記式（１）で規定される、上記（１）から（４）のいずれかに記載の保護具。
　Ｈ≧０．４４７Ａ　・・・（１）
　ただし、上記式（１）において、Ａは、前記筒状部の外径を示す。 (5) The outer peripheral surface of the tubular portion has a circular shape in a cross section perpendicular to the axial direction.
The protective device according to any one of (1) to (4) above, wherein the distance H between the flange portion and the first fin in the axial direction is defined by the following formula (1).
H ≧ 0.447A ・ ・ ・ (1)
However, in the above formula (1), A indicates the outer diameter of the tubular portion.
（６）前記第１フィンは、前記軸方向に垂直な断面における外縁の周長が前記軸方向において前記フランジ部に近付くにつれて大きくなるテーパー形状を有している、上記（１）から（５）のいずれかに記載の保護具。 (6) The first fin has a tapered shape in which the peripheral length of the outer edge in the cross section perpendicular to the axial direction increases as it approaches the flange portion in the axial direction, from (1) to (5) above. Protective equipment described in any of.
（７）前記フランジ部は、前記軸方向における前記第１フィン側から見て環形状を有する保護面を備え、
　前記保護面は、前記軸方向に垂直な断面における周長が前記軸方向において前記第１フィンに近付くにつれて大きくなるテーパー形状を有している、上記（１）から（６）のいずれかに記載の保護具。 (7) The flange portion includes a protective surface having a ring shape when viewed from the first fin side in the axial direction.
The protective surface has a tapered shape in which the peripheral length in a cross section perpendicular to the axial direction increases as the peripheral length approaches the first fin in the axial direction, according to any one of (1) to (6) above. Protective equipment.
（８）前記フランジ部と前記第１フィンとの前記軸方向における距離は９０ｍｍ以上である、上記（１）から（７）のいずれかに記載の保護具。 (8) The protective device according to any one of (1) to (7) above, wherein the distance between the flange portion and the first fin in the axial direction is 90 mm or more.
（９）前記筒状部の前記軸方向に直交する方向において、前記第１フィンの高さは、前記軸方向における前記第１フィンと前記第２フィンとの距離未満に設定される、上記（１）から（８）のいずれかに記載の保護具。 (9) The height of the first fin is set to be less than the distance between the first fin and the second fin in the axial direction in the direction orthogonal to the axial direction of the tubular portion. The protective device according to any one of 1) to (8).
（１０）前記筒状部の前記軸方向に直交する方向において、前記第２フィンの高さは、前記軸方向における前記第２フィンと前記フランジ部との距離未満に設定される、上記（１）から（９）のいずれかに記載の保護具。 (10) The height of the second fin is set to be less than the distance between the second fin and the flange portion in the axial direction in the direction orthogonal to the axial direction of the tubular portion (1). ) To (9).
（１１）前記筒状部は、前記軸方向における一端から他端に亘って連続した内面を有している、上記（１）から（１０）のいずれかに記載の保護具。 (11) The protective tool according to any one of (1) to (10) above, wherein the tubular portion has a continuous inner surface from one end to the other end in the axial direction.
（１２）前記金属管の端部に装着された際に、前記第１フィンの両面のうち、前記軸方向において前記フランジ部とは反対側の面が前記金属管の内面に押し付けられ、前記第２フィンの両面のうち、前記軸方向において前記フランジ部とは反対側の面が前記金属管の前記内面に押し付けられる、上記（１）から（１１）のいずれかに記載の保護具。 (12) When attached to the end of the metal pipe, the surface of both sides of the first fin opposite to the flange in the axial direction is pressed against the inner surface of the metal pipe, and the first fin. The protective device according to any one of (1) to (11) above, wherein the surface of both sides of the two fins opposite to the flange portion in the axial direction is pressed against the inner surface of the metal pipe.
（１３）前記筒状部の外径は、前記金属管の内径の０．８５倍以上１倍未満である、上記（１）から（１２）のいずれかに記載の保護具。 (13) The protective device according to any one of (1) to (12) above, wherein the outer diameter of the tubular portion is 0.85 times or more and less than 1 times the inner diameter of the metal tube.
（１４）前記筒状部において前記フランジ部とは反対側の端部に設けられた底部をさらに備える、上記（１）から（１３）のいずれかに記載の保護具。 (14) The protective tool according to any one of (1) to (13) above, further comprising a bottom portion of the tubular portion provided at an end portion opposite to the flange portion.
（１５）前記底部に貫通孔が形成されている、上記（１４）に記載の保護具。 (15) The protective device according to (14) above, wherein a through hole is formed in the bottom portion.
（１６）金属管と、
　前記金属管の端部に装着された上記（１）から（１５）のいずれかに記載の保護具と、
を備えた保護具付き金属管。 (16) With a metal tube
The protective device according to any one of (1) to (15) above, which is attached to the end of the metal tube.
Metal tube with protective equipment.
（１７）前記筒状部の前記外周面は、前記軸方向に垂直な断面において円形状を有し、
　前記フランジ部と前記第１フィンとの前記軸方向における距離Ｈは、下記式（２）で規定される、上記（１６）に記載の保護具付き金属管。
　Ｈ≧（Ｄ２－（（Ａ＋Ｄ）／２）２）１／２　・・・（２）
　ただし、上記式（２）において、Ｄは、前記金属管の内径を示し、Ａは、前記筒状部の外径を示す。 (17) The outer peripheral surface of the tubular portion has a circular shape in a cross section perpendicular to the axial direction.
The protective device-equipped metal pipe according to (16) above, wherein the distance H between the flange portion and the first fin in the axial direction is defined by the following formula (2).
H ≧ (D 2 -((A + D) / 2) 2 ) 1/2 ... (2)
However, in the above formula (2), D indicates the inner diameter of the metal pipe, and A indicates the outer diameter of the tubular portion.
　本発明によれば、金属管の端部にフックを引っかけることが可能な状態で該端部を保護することができる。 According to the present invention, the end portion can be protected in a state where the hook can be hooked on the end portion of the metal tube.
図１は、保護具の一例を示す図である。FIG. 1 is a diagram showing an example of protective equipment. 図２は、図１に示した保護具の使用状態を示す図である。FIG. 2 is a diagram showing a usage state of the protective equipment shown in FIG. 図３は、保護具の変形例を示す図である。FIG. 3 is a diagram showing a modified example of the protective equipment. 図４は、保護具の他の変形例を示す図である。FIG. 4 is a diagram showing another modification of the protective device. 図５は、本発明の一実施形態に係る保護具を示す斜視図である。FIG. 5 is a perspective view showing a protective device according to an embodiment of the present invention. 図６は、図５の保護具を軸方向における反対側から見た斜視図である。FIG. 6 is a perspective view of the protective device of FIG. 5 as viewed from the opposite side in the axial direction. 図７は、図５のＩ－Ｉ部分を示す断面図である。FIG. 7 is a cross-sectional view showing the II portion of FIG. 図８は、本発明の一実施形態に係る保護具付き金属管を示す図である。FIG. 8 is a diagram showing a metal tube with a protective device according to an embodiment of the present invention. 図９は、本発明の一実施形態に係る保護具付き金属管を示す図である。FIG. 9 is a diagram showing a metal tube with a protective device according to an embodiment of the present invention. 図１０は、本発明の一実施形態に係る保護具付き金属管を示す図である。FIG. 10 is a diagram showing a metal tube with a protective device according to an embodiment of the present invention. 図１１は、本発明の他の実施形態に係る保護具を示す図である。FIG. 11 is a diagram showing a protective device according to another embodiment of the present invention. 図１２は、本発明のその他の実施形態に係る保護具を示す図である。FIG. 12 is a diagram showing a protective device according to another embodiment of the present invention. 図１３は、本発明のさらに他の実施形態に係る保護具を示す図である。FIG. 13 is a diagram showing a protective device according to still another embodiment of the present invention. 図１４は、保護具の変形例を示す図である。FIG. 14 is a diagram showing a modified example of the protective equipment.
　本発明者らは、金属管の端部にフックを引っかけることが可能な状態で該端部を保護することができる保護具の構成について種々の検討を行った。具体的には、本発明者らは、まず、特許文献１に開示された保護具の構成について詳細に検討した。 The present inventors have conducted various studies on the configuration of a protective device capable of protecting the end portion of the metal tube in a state where the hook can be hooked on the end portion. Specifically, the present inventors first examined in detail the configuration of the protective device disclosed in Patent Document 1.
　図１は、特許文献１に開示された保護具と同様の構成を有する保護具を示す図である。具体的には、図１（ａ）は、保護具の正面図であり、図１（ｂ）は、図１（ａ）のｂ－ｂ部分を示す断面図である。 FIG. 1 is a diagram showing a protective device having the same configuration as the protective device disclosed in Patent Document 1. Specifically, FIG. 1A is a front view of the protective equipment, and FIG. 1B is a cross-sectional view showing a portion bb of FIG. 1A.
　図１に示す保護具１００は、筒状体１０２と、筒状体１０２の一端に設けられた円板１０４と、筒状体１０２の外周面に設けられた４つの係止部材１０６とを備えている。図２は、図１に示した保護具１００の使用状態を示す図である。 The protective tool 100 shown in FIG. 1 includes a tubular body 102, a disk 104 provided at one end of the tubular body 102, and four locking members 106 provided on the outer peripheral surface of the tubular body 102. ing. FIG. 2 is a diagram showing a usage state of the protective device 100 shown in FIG.
　図２に示すように、保護具１００を金属管１の端部に装着する場合、係止部材１０６が金属管１の内面１ａに沿って湾曲する。このように係止部材１０６が金属管１の内面１ａに沿って湾曲しつつ内面１ａに押し付けられることによって、金属管１から保護具１００が抜け落ちることを抑制することができる。また、係止部材１０６が金属管１の内面１ａに沿って湾曲することができるので、異なる内径を有する種々の金属管１に保護具１００を装着することが可能になる。 As shown in FIG. 2, when the protective tool 100 is attached to the end of the metal tube 1, the locking member 106 is curved along the inner surface 1a of the metal tube 1. By pressing the locking member 106 against the inner surface 1a while bending along the inner surface 1a of the metal tube 1 in this way, it is possible to prevent the protective tool 100 from falling out of the metal tube 1. Further, since the locking member 106 can be curved along the inner surface 1a of the metal tube 1, the protective tool 100 can be attached to various metal tubes 1 having different inner diameters.
　保護具による上記のような効果を発揮しつつ、金属管１の端部にフックを引っかけることを可能にするために、本発明者らは、上述の保護具１００を改良した。具体的には、図３に示す保護具１００ａを金属管１に装着することを検討した。なお、図３に示す保護具１００ａが図１および図２に示した保護具１００と異なるのは、円板１０４の代わりに、中空円板状のフランジ部１０４ａを有している点である。 The present inventors have improved the above-mentioned protective equipment 100 in order to enable the hook to be hooked on the end of the metal tube 1 while exhibiting the above-mentioned effects of the protective equipment. Specifically, it was examined to attach the protective device 100a shown in FIG. 3 to the metal tube 1. The protective tool 100a shown in FIG. 3 is different from the protective tool 100 shown in FIGS. 1 and 2 in that it has a hollow disk-shaped flange portion 104a instead of the disk 104.
　図３に示すように、保護具１００ａを利用した場合には、筒状体１０２内にフック２００を差し込むことができる。これにより、金属管１の端部の損傷を防止しつつ、フック２００によって金属管１を吊り上げることが可能になる。 As shown in FIG. 3, when the protective device 100a is used, the hook 200 can be inserted into the tubular body 102. As a result, the metal pipe 1 can be lifted by the hook 200 while preventing damage to the end portion of the metal pipe 1.
　しかしながら、本発明者らのさらなる検討の結果、上述の保護具１００ａを利用する場合には、以下のような問題が生じることが分かった。 However, as a result of further studies by the present inventors, it has been found that the following problems occur when the above-mentioned protective device 100a is used.
　図１を参照して、上述の保護具１００ａでは、複数の係止部材１０６は、筒状体１０２の周方向において互いに離隔して設けられている。このため、筒状体１０２のうち、点線で示す４つの領域１０２ａの外面には係止部材１０６が設けられていない。この点に関して、図３に示すように、金属管１を吊り上げる際に、筒状体１０２のうち係止部材１０６が設けられている領域の内面にフック２００が引っかけられる場合には、係止部材１０６が十分な力で金属管１の内面１ａに押し付けられる。この場合、金属管１の内面１ａと係止部材１０６との間に摩擦力を生じさせることができる。これにより、金属管１から保護具１００ａが抜け落ちることを抑制できる。 With reference to FIG. 1, in the above-mentioned protective device 100a, the plurality of locking members 106 are provided so as to be separated from each other in the circumferential direction of the tubular body 102. Therefore, the locking member 106 is not provided on the outer surface of the four regions 102a shown by the dotted lines in the tubular body 102. Regarding this point, as shown in FIG. 3, when the hook 200 is hooked on the inner surface of the region of the tubular body 102 where the locking member 106 is provided when the metal tube 1 is lifted, the locking member The 106 is pressed against the inner surface 1a of the metal tube 1 with sufficient force. In this case, a frictional force can be generated between the inner surface 1a of the metal tube 1 and the locking member 106. As a result, it is possible to prevent the protective device 100a from falling out of the metal tube 1.
　一方で、金属管１を吊り上げる際に、筒状体１０２のうち、係止部材１０６が設けられていない領域１０２ａ（図１参照）の内面にフック２００が引っかけられると、係止部材１０６を十分な力で金属管１の内面１ａに押し付けることができない。この場合、金属管１の内面１ａと係止部材１０６との間に十分な摩擦力を生じさせることができない。このため、金属管１から保護具１００ａが抜け落ちることを十分に抑制できない場合がある。 On the other hand, when the metal pipe 1 is lifted, if the hook 200 is hooked on the inner surface of the region 102a (see FIG. 1) of the tubular body 102 where the locking member 106 is not provided, the locking member 106 is sufficiently lifted. It cannot be pressed against the inner surface 1a of the metal tube 1 with a strong force. In this case, a sufficient frictional force cannot be generated between the inner surface 1a of the metal tube 1 and the locking member 106. Therefore, it may not be possible to sufficiently prevent the protective device 100a from falling out of the metal tube 1.
　そこで、本発明者らは、上述の保護具１００ａをさらに改良した。具体的には、図４に示す保護具１００ｂを金属管１（図３参照）に装着することを検討した。なお、図４は、保護具１００ｂの正面図である。また、図４に示す保護具１００ｂが図３に示した保護具１００ａと異なるのは、４つの係止部材１０６の代わりに、筒状体１０２の全周を覆うように設けられた中空円板状の係止部材１０６ａを有している点である。 Therefore, the present inventors further improved the above-mentioned protective device 100a. Specifically, it was examined to attach the protective device 100b shown in FIG. 4 to the metal tube 1 (see FIG. 3). Note that FIG. 4 is a front view of the protective device 100b. Further, the protective tool 100b shown in FIG. 4 is different from the protective tool 100a shown in FIG. 3 in that instead of the four locking members 106, a hollow disk provided so as to cover the entire circumference of the tubular body 102. It is a point that has a shaped locking member 106a.
　保護具１００ｂを利用する場合には、フック２００（図３参照）によって金属管１（図３参照）を吊り上げる際に、フック２００の差し込み位置（筒状体１０２の周方向における位置）に関わらず、金属管１の内面１ａに係止部材１０６ａを押し付けることができる。すなわち、フック２００の差し込み位置に関わらず、金属管１の内面１ａと係止部材１０６ａとの間に摩擦力を生じさせることができる。しかしながら、本発明者らがさらに検討を進めたところ、保護具１００ｂを利用して金属管１を吊り上げたとしても、金属管１から保護具１００ｂが抜け落ちる場合があることが分かった。また、保護具１００ｂを取り付けた状態で金属管１を搬送する際にも、保護具１００ｂが抜け落ちる場合があることが分かった。 When the protective tool 100b is used, when the metal tube 1 (see FIG. 3) is lifted by the hook 200 (see FIG. 3), the hook 200 is inserted regardless of the insertion position (position in the circumferential direction of the tubular body 102). , The locking member 106a can be pressed against the inner surface 1a of the metal tube 1. That is, a frictional force can be generated between the inner surface 1a of the metal tube 1 and the locking member 106a regardless of the insertion position of the hook 200. However, as a result of further studies by the present inventors, it has been found that even if the metal tube 1 is lifted by using the protective device 100b, the protective device 100b may fall out from the metal tube 1. It was also found that the protective tool 100b may come off when the metal tube 1 is conveyed with the protective tool 100b attached.
　本発明は、本発明者らの詳細な検討によって得られた上記の知見に基づいてなされたものである。以下、本発明の実施の形態に係る保護具およびそれを備えた金属管について図面を用いて説明する。 The present invention has been made based on the above findings obtained by the detailed examination of the present inventors. Hereinafter, a protective device according to an embodiment of the present invention and a metal tube provided with the protective device will be described with reference to the drawings.
（保護具の構成）
　図５および図６は、本発明の一実施形態に係る保護具を示す斜視図であり、図７は、図５のＩ－Ｉ部分を示す断面図である。また、図８～図１０は、図５に示す保護具が取り付けられた状態の金属管を示す図である。なお、図６は、図５の保護具１０を、軸方向における反対側から見た斜視図である。また、図８～図１０では、金属管の軸方向から見て金属管および保護具を二等分割して得られる金属管および保護具の断面を示している。 (Structure of protective equipment)
5 and 6 are perspective views showing a protective device according to an embodiment of the present invention, and FIG. 7 is a cross-sectional view showing an I-I portion of FIG. 8 to 10 are views showing a metal pipe to which the protective equipment shown in FIG. 5 is attached. Note that FIG. 6 is a perspective view of the protective tool 10 of FIG. 5 as viewed from the opposite side in the axial direction. Further, FIGS. 8 to 10 show a cross section of the metal tube and the protective tool obtained by dividing the metal tube and the protective tool into two equal parts when viewed from the axial direction of the metal tube.
　図５～図７に示すように、本実施形態に係る保護具１０は、中空かつ環状のフランジ部１２と、フランジ部１２の内縁部から一方向に向かって延びる筒状部１４と、筒状部１４の外周面から突出する複数の環状かつ板状のフィン１６，１８と、円板状の底部２０とを備えている。なお、本実施形態では、フィン１６が第１フィンに対応し、フィン１８が第２フィンに対応する。また、図７においては、筒状部１４の軸方向を一点鎖線の矢印で示している。 As shown in FIGS. 5 to 7, the protective tool 10 according to the present embodiment has a hollow and annular flange portion 12, a tubular portion 14 extending in one direction from the inner edge portion of the flange portion 12, and a tubular portion. A plurality of annular and plate-shaped fins 16 and 18 projecting from the outer peripheral surface of the portion 14 and a disk-shaped bottom portion 20 are provided. In the present embodiment, the fin 16 corresponds to the first fin, and the fin 18 corresponds to the second fin. Further, in FIG. 7, the axial direction of the tubular portion 14 is indicated by the arrow of the alternate long and short dash line.
　本実施形態では、フランジ部１２、フィン１６、およびフィン１８はそれぞれ、円環形状を有している。また、フランジ部１２、フィン１６およびフィン１８は、筒状部１４の軸方向において互いに離隔して設けられている。フランジ部１２の外径は、金属管１（図８参照）の内径よりも大きい。フランジ部１２は、筒状部１４の軸方向においてフィン１６側から見て環形状を有する保護面１２ａを備えている。筒状部１４の外周面は、筒状部１４の軸方向に垂直な断面において円形状を有する。本実施形態では、筒状部１４は、円筒形状を有している。 In the present embodiment, the flange portion 12, the fin 16, and the fin 18 each have an annular shape. Further, the flange portion 12, the fin 16 and the fin 18 are provided so as to be separated from each other in the axial direction of the tubular portion 14. The outer diameter of the flange portion 12 is larger than the inner diameter of the metal pipe 1 (see FIG. 8). The flange portion 12 includes a protective surface 12a having a ring shape when viewed from the fin 16 side in the axial direction of the tubular portion 14. The outer peripheral surface of the tubular portion 14 has a circular shape in a cross section perpendicular to the axial direction of the tubular portion 14. In the present embodiment, the tubular portion 14 has a cylindrical shape.
　フランジ部１２は、筒状部１４の軸方向において、筒状部１４の一端に設けられている。筒状部１４の一端は、フック２００（図９参照）を挿入できるように開口している。フィン１６は、筒状部１４の軸方向において、筒状部１４の中心よりも他端側に設けられている。フィン１８は、筒状部１４の軸方向において、フランジ部１２とフィン１６との間に設けられている。本実施形態では、フィン１８は、例えば、筒状部１４の軸方向において、フランジ部１２とフィン１６との中点上に設けられる。底部２０は、筒状部１４の軸方向において、筒状部１４の他端側を塞ぐように設けられている。本実施形態では、底部２０の中央部に、貫通孔２０ａが形成されている。詳細な説明は省略するが、貫通孔２０ａはベントホールとして機能する。また、作業者は、貫通孔２０ａに指または治具を差し込むことによって、保護具１０を金属管１から容易に取り外すことができる。なお、底部２０に２つ以上の貫通孔が形成されてもよい。 The flange portion 12 is provided at one end of the tubular portion 14 in the axial direction of the tubular portion 14. One end of the tubular portion 14 is open so that the hook 200 (see FIG. 9) can be inserted. The fins 16 are provided on the other end side of the center of the tubular portion 14 in the axial direction of the tubular portion 14. The fin 18 is provided between the flange portion 12 and the fin 16 in the axial direction of the tubular portion 14. In the present embodiment, the fin 18 is provided, for example, on the midpoint between the flange portion 12 and the fin 16 in the axial direction of the tubular portion 14. The bottom portion 20 is provided so as to close the other end side of the tubular portion 14 in the axial direction of the tubular portion 14. In the present embodiment, a through hole 20a is formed in the central portion of the bottom portion 20. Although detailed description is omitted, the through hole 20a functions as a vent hole. Further, the operator can easily remove the protective tool 10 from the metal tube 1 by inserting a finger or a jig into the through hole 20a. In addition, two or more through holes may be formed in the bottom portion 20.
　本実施形態では、筒状部１４は、軸方向における一端から他端に亘って連続した筒形状を有している。言い換えると、筒状部１４は、軸方向における一端から他端に亘って連続した内面を有している。フィン１６およびフィン１８はそれぞれ、筒状部１４の外周面から、筒状部１４の軸方向に交差する方向に突出するように設けられている。すなわち、本実施形態では、筒状部１４の一部を変形させてフィン１６，１８を形成するのではなく、筒状部１４とは別にフィン１６，１８を形成している。本実施形態では、フィン１６およびフィン１８はそれぞれ、筒状部１４の外周面から筒状部１４の径方向に突出している。 In the present embodiment, the tubular portion 14 has a continuous tubular shape from one end to the other end in the axial direction. In other words, the tubular portion 14 has a continuous inner surface from one end to the other end in the axial direction. The fins 16 and 18 are provided so as to project from the outer peripheral surface of the tubular portion 14 in a direction intersecting the axial direction of the tubular portion 14, respectively. That is, in the present embodiment, the fins 16 and 18 are formed separately from the tubular portion 14 instead of deforming a part of the tubular portion 14 to form the fins 16 and 18. In the present embodiment, the fins 16 and 18 each project from the outer peripheral surface of the tubular portion 14 in the radial direction of the tubular portion 14.
　筒状部１４の軸方向から見て、フィン１６に外接する円の直径およびフィン１８に外接する円の直径はそれぞれ、金属管１の内径よりも大きい。本実施形態では、フィン１６，１８は円環形状を有しているので、フィン１６，１８の外径は金属管１の内径よりも大きい。これにより、金属管１に保護具１０を装着した際に、フィン１６，１８を金属管１の内面１ａに適切に接触させることができる。 When viewed from the axial direction of the tubular portion 14, the diameter of the circle circumscribing the fin 16 and the diameter of the circle circumscribing the fin 18 are each larger than the inner diameter of the metal tube 1. In the present embodiment, since the fins 16 and 18 have an annular shape, the outer diameters of the fins 16 and 18 are larger than the inner diameter of the metal tube 1. As a result, when the protective device 10 is attached to the metal tube 1, the fins 16 and 18 can be appropriately brought into contact with the inner surface 1a of the metal tube 1.
　本実施形態では、筒状部１４の軸方向に直交する方向において、フィン１６およびフィン１８の高さは、例えば、フランジ部１２の高さの１／２以上に設定される。また、本実施形態では、フィン１６の高さは、例えば、筒状部１４の軸方向におけるフィン１６とフィン１８との距離未満に設定される。また、フィン１８の高さは、例えば、筒状部１４の軸方向におけるフィン１８とフランジ部１２との距離未満に設定される。なお、本実施形態において、フィンの高さとは、筒状部の軸方向に直交する方向において、筒状部の外周面からフィンの外縁までの距離を意味する。また、フランジ部の高さとは、筒状部の軸方向に直交する方向において、筒状部の外周面からフランジ部の外縁までの距離を意味する。 In the present embodiment, the heights of the fins 16 and 18 are set to, for example, 1/2 or more of the height of the flange portion 12 in the direction orthogonal to the axial direction of the tubular portion 14. Further, in the present embodiment, the height of the fin 16 is set to be less than, for example, the distance between the fin 16 and the fin 18 in the axial direction of the tubular portion 14. Further, the height of the fin 18 is set to be less than the distance between the fin 18 and the flange portion 12 in the axial direction of the tubular portion 14, for example. In the present embodiment, the fin height means the distance from the outer peripheral surface of the tubular portion to the outer edge of the fin in the direction orthogonal to the axial direction of the tubular portion. Further, the height of the flange portion means a distance from the outer peripheral surface of the tubular portion to the outer edge of the flange portion in a direction orthogonal to the axial direction of the tubular portion.
　なお、本実施形態では、フィン１６およびフィン１８の高さは、下記式（３），（４）を満たすことが好ましい。
　ｆ≧（Ｄ－Ａ＋β）／２　・・・（３）
　２≦β≦５　・・・（４）
　ただし、上記式において、ｆは、フィンの高さを示し、Ｄは、保護具が装着される金属管の内径を示し、Ａは、筒状部の外径を示す。 In this embodiment, the heights of the fins 16 and 18 preferably satisfy the following equations (3) and (4).
f ≧ (DA + β) / 2 ・ ・ ・ (3)
2 ≦ β ≦ 5 ・ ・ ・ (4)
However, in the above formula, f indicates the height of the fin, D indicates the inner diameter of the metal tube to which the protective equipment is mounted, and A indicates the outer diameter of the tubular portion.
　本実施形態では、保護具１０は、ポリエチレン等の樹脂材料によって形成される。また、フィン１６およびフィン１８の厚みはそれぞれ、フィン１６およびフィン１８がそれぞれ可撓性を有するように設定される。具体的には、フィン１６およびフィン１８の厚みは、例えば、１～４ｍｍ程度に設定される。なお、フランジ部１２の厚みは、例えば、１～１５ｍｍ程度に設定され、筒状部１４の厚みは、例えば、１～５ｍｍ程度に設定される。 In the present embodiment, the protective device 10 is formed of a resin material such as polyethylene. Further, the thicknesses of the fins 16 and 18, respectively, are set so that the fins 16 and 18 have flexibility, respectively. Specifically, the thicknesses of the fins 16 and 18 are set to, for example, about 1 to 4 mm. The thickness of the flange portion 12 is set to, for example, about 1 to 15 mm, and the thickness of the tubular portion 14 is set to, for example, about 1 to 5 mm.
　図８に示すように、筒状部１４を金属管１内に挿入しつつ、フランジ部１２の保護面１２ａによって金属管１の端面を覆うように、保護具１０が金属管１の両端部にそれぞれ装着される。これにより、金属管１の両端面が保護される。フィン１６およびフィン１８はそれぞれ、保護具１０が金属管１に装着された際に、湾曲しつつ内面１ａに押し付けられる。具体的には、フィン１６の両面のうち、筒状部１４の軸方向においてフランジ部１２とは反対側の面が内面１ａに押し付けられる。同様に、フィン１８の両面のうち、筒状部１４の軸方向においてフランジ部１２とは反対側の面が内面１ａに押し付けられる。この際、筒状部１４の軸方向に直交する方向において、金属管１の内面１ａと筒状部１４の外周面との距離は、下記式（５）で示される。
　Ｔ＝（Ｄ－Ａ）／２　・・・（５）
　ただし、上記式において、Ｔは、金属管の内面と筒状部の外周面との距離を示し、Ｄは、金属管の内径を示し、Ａは、筒状部の外径を示す。 As shown in FIG. 8, while inserting the tubular portion 14 into the metal tube 1, protective tools 10 are attached to both ends of the metal tube 1 so that the protective surface 12a of the flange portion 12 covers the end surface of the metal tube 1. Each is installed. As a result, both end faces of the metal tube 1 are protected. When the protective device 10 is attached to the metal tube 1, the fins 16 and 18 are respectively pressed against the inner surface 1a while being curved. Specifically, of both sides of the fin 16, the surface opposite to the flange portion 12 in the axial direction of the tubular portion 14 is pressed against the inner surface 1a. Similarly, of both sides of the fin 18, the surface of the tubular portion 14 opposite to the flange portion 12 in the axial direction is pressed against the inner surface 1a. At this time, the distance between the inner surface 1a of the metal tube 1 and the outer peripheral surface of the tubular portion 14 in the direction orthogonal to the axial direction of the tubular portion 14 is represented by the following equation (5).
T = (DA) / 2 ... (5)
However, in the above formula, T indicates the distance between the inner surface of the metal pipe and the outer peripheral surface of the tubular portion, D indicates the inner diameter of the metal pipe, and A indicates the outer diameter of the tubular portion.
　図９に示すように、両端部に保護具１０が装着された金属管１をクレーン等によって吊り上げる際には、筒状部１４内にフック２００が差し込まれる。その状態で、フック２００を引き上げることによって、金属管１が吊り上げられる。このとき、フィン１６およびフィン１８のうち、フック２００によって金属管１の内面１ａに押し付けられる部分は押し潰されるように変形するが、内面１ａから離れる部分の形状は一時的に維持される。 As shown in FIG. 9, when the metal pipe 1 having the protective equipment 10 attached to both ends is lifted by a crane or the like, the hook 200 is inserted into the tubular portion 14. In that state, the metal tube 1 is lifted by pulling up the hook 200. At this time, of the fins 16 and 18, the portion pressed against the inner surface 1a of the metal tube 1 by the hook 200 is deformed so as to be crushed, but the shape of the portion separated from the inner surface 1a is temporarily maintained.
　図１０は、保護具１０からフック２００を取り外した際に生じる現象を説明するための図である。図９に示したように、保護具１０にフック２００を引っかけて金属管１を吊り上げている際には、フィン１６およびフィン１８のうちの一部は、押し潰されるように変形する。このようにフィン１６およびフィン１８が変形した状態で、保護具１０からフック２００を取り外すと、図１０に示すように、金属管１に対して保護具１０が傾く場合がある。 FIG. 10 is a diagram for explaining a phenomenon that occurs when the hook 200 is removed from the protective device 10. As shown in FIG. 9, when the hook 200 is hooked on the protective device 10 to lift the metal tube 1, a part of the fins 16 and 18 is deformed so as to be crushed. If the hook 200 is removed from the protective device 10 with the fins 16 and 18 deformed in this way, the protective device 10 may tilt with respect to the metal tube 1 as shown in FIG.
　図１０に示した例では、筒状部１４の外周面のうちフランジ部１２の近傍の部分が金属管１に接触するとともに、フィン１６の外周面が金属管１に接触することによって、保護具１０が金属管１から抜け落ちることが防止されている。なお、図１０においては、筒状部１４のうち金属管１に接触している部分を示す位置Ｐ１と、フィン１６のうち金属管１に接触している部分を示す位置Ｐ２との距離Ｘが示されている。 In the example shown in FIG. 10, a portion of the outer peripheral surface of the tubular portion 14 in the vicinity of the flange portion 12 comes into contact with the metal tube 1, and the outer peripheral surface of the fin 16 comes into contact with the metal tube 1 to protect the protective device. 10 is prevented from falling out of the metal tube 1. In FIG. 10, the distance X between the position P1 indicating the portion of the tubular portion 14 in contact with the metal tube 1 and the position P2 of the fin 16 indicating the portion in contact with the metal tube 1 is It is shown.
　保護具１０が傾斜した場合でも、位置Ｐ１とフランジ部１２との隙間は十分に小さいこと、およびフック２００が取り外された後もフィン１６の形状がしばらく維持されることを考慮すると、位置Ｐ１と位置Ｐ２との距離Ｘは、図８に示す位置Ｐ３と位置Ｐ４との距離Ｙに略等しいと考えることができる。なお、位置Ｐ３は、筒状部１４の軸方向から見て金属管１および保護具１０を二等分割して得られる断面において、保護面１２ａと筒状部１４の外周面との一対の境界部のうちの一方の境界部の位置を示す。位置Ｐ４は、上記断面において、後述する位置Ｐ５を通りかつ筒状部１４の軸方向に直交する方向に延びる仮想的な直線Ｌと金属管１の内面１ａとの一対の交点のうち、位置Ｐ３から遠い方の交点の位置を示す。位置Ｐ５は、上記断面において、フィン１６のフランジ部１２側の面と筒状部１４の外周面との境界部の位置を示す。なお、図８には、筒状部１４の軸方向における位置Ｐ３と位置Ｐ５との距離Ｈが示されている。距離Ｈは、筒状部１４の軸方向におけるフランジ部１２とフィン１６との距離に相当する。 Considering that the gap between the position P1 and the flange portion 12 is sufficiently small even when the protective tool 10 is tilted, and that the shape of the fin 16 is maintained for a while even after the hook 200 is removed, the position P1 and the position P1 The distance X from the position P2 can be considered to be substantially equal to the distance Y between the position P3 and the position P4 shown in FIG. The position P3 is a pair of boundaries between the protective surface 12a and the outer peripheral surface of the tubular portion 14 in a cross section obtained by dividing the metal tube 1 and the protective tool 10 into two equal parts when viewed from the axial direction of the tubular portion 14. Indicates the position of the boundary of one of the parts. The position P4 is the position P3 of the pair of intersections of the virtual straight line L extending in the direction orthogonal to the axial direction of the tubular portion 14 and the inner surface 1a of the metal tube 1 in the cross section described above. Indicates the position of the intersection farther from. The position P5 indicates the position of the boundary portion between the surface of the fin 16 on the flange portion 12 side and the outer peripheral surface of the tubular portion 14 in the above cross section. Note that FIG. 8 shows the distance H between the position P3 and the position P5 in the axial direction of the tubular portion 14. The distance H corresponds to the distance between the flange portion 12 and the fin 16 in the axial direction of the tubular portion 14.
　本実施形態では、距離Ｙが金属管１の内径Ｄ以上に設定される。これにより、図１０に示すように、保護具１０が金属管１に対して傾斜した場合でも、筒状部１４が金属管１に接触するとともに、フィン１６が金属管１に接触することによって、保護具１０が金属管１から抜け落ちることが防止される。 In the present embodiment, the distance Y is set to be equal to or larger than the inner diameter D of the metal tube 1. As a result, as shown in FIG. 10, even when the protective tool 10 is tilted with respect to the metal pipe 1, the tubular portion 14 comes into contact with the metal pipe 1 and the fins 16 come into contact with the metal pipe 1. The protective device 10 is prevented from falling out of the metal tube 1.
　なお、図８を参照して、三平方の定理より、距離Ｙは、筒状部１４の外径Ａおよび上述の距離Ｔ，Ｈを用いて下記式（６）によって示すことができる。
　Ｙ＝（Ｈ２＋（Ａ＋Ｔ）２）１／２　・・・（６） In addition, referring to FIG. 8, according to the Pythagorean theorem, the distance Y can be expressed by the following equation (6) using the outer diameter A of the tubular portion 14 and the above-mentioned distances T and H.
Y = (H 2 + (A + T) 2 ) 1/2 ... (6)
　距離Ｔは上記式（５）によって示されるので、上記式（６）は、下記式（７）のように変形できる。
　Ｙ＝（Ｈ２＋（（Ａ＋Ｄ）／２）２）１／２　・・・（７） Since the distance T is represented by the above equation (5), the above equation (6) can be modified as in the following equation (7).
Y = (H 2 + ((A + D) / 2) 2 ) 1/2 ... (7)
　上述したように、本実施形態では、距離Ｙは、金属管１の内径Ｄ以上に設定される。したがって、上記式（７）は、下記式（８）のように変形できる。
　Ｄ≦（Ｈ２＋（（Ａ＋Ｄ）／２）２）１／２　・・・（８） As described above, in the present embodiment, the distance Y is set to be equal to or larger than the inner diameter D of the metal tube 1. Therefore, the above equation (7) can be modified as the following equation (8).
D ≤ (H 2 + ((A + D) / 2) 2 ) 1/2 ... (8)
　上記式（８）を変形することによって、距離Ｈは、下記式（２）で示すことができる。
　Ｈ≧（Ｄ２－（（Ａ＋Ｄ）／２）２）１／２　・・・（２） By modifying the above equation (8), the distance H can be expressed by the following equation (2).
H ≧ (D 2 -((A + D) / 2) 2 ) 1/2 ... (2)
　なお、本実施形態では、保護具１０の筒状部１４の外径Ａは、例えば、金属管１の内径Ｄの０．８５倍以上かつ内径Ｄ未満に設定される。この点を考慮すると、上記式（２）は、下記式（１）のように変形することができる。
　Ｈ≧０．４４７Ａ　・・・（１） In the present embodiment, the outer diameter A of the tubular portion 14 of the protective tool 10 is set to, for example, 0.85 times or more and less than the inner diameter D of the inner diameter D of the metal tube 1. Considering this point, the above equation (2) can be modified as the following equation (1).
H ≧ 0.447A ・ ・ ・ (1)
　なお、上記距離Ｈは、９０ｍｍ以上に設定されることが好ましい。この場合、種々の内径の金属管１において、保護具１０が抜け落ちることを十分に抑制することができる。また、筒状部１４の軸方向において、筒状部１４の他端（筒状部１４の軸方向における両端のうちフランジ部１２とは反対側の端）とフィン１６との距離は、１０ｍｍ以下に設定されることが好ましい。この場合、フック２００によって金属管１を吊り上げる際に、金属管１内において、保護具１０が金属管１に対して傾くことを十分に抑制できる。その結果、保護具１０を金属管１により安定して装着することができる。なお、金属管１から保護具１０が抜け落ちることを確実に防止する観点からは、筒状部１４の軸方向の長さを十分に長くすることが好ましい。この場合には、筒状部１４の他端（フランジ部１２とは反対側の端）とフィン１６との距離は、例えば、１０ｍｍ以上に設定される。 The distance H is preferably set to 90 mm or more. In this case, it is possible to sufficiently prevent the protective tool 10 from coming off in the metal pipes 1 having various inner diameters. Further, in the axial direction of the tubular portion 14, the distance between the other end of the tubular portion 14 (the end of both ends of the tubular portion 14 in the axial direction opposite to the flange portion 12) and the fin 16 is 10 mm or less. It is preferable to set to. In this case, when the metal pipe 1 is lifted by the hook 200, it is possible to sufficiently prevent the protective tool 10 from tilting with respect to the metal pipe 1 in the metal pipe 1. As a result, the protective device 10 can be stably attached by the metal tube 1. From the viewpoint of surely preventing the protective tool 10 from falling out of the metal tube 1, it is preferable that the length of the tubular portion 14 in the axial direction is sufficiently long. In this case, the distance between the other end of the tubular portion 14 (the end opposite to the flange portion 12) and the fin 16 is set to, for example, 10 mm or more.
（本実施形態の効果）
　本実施形態に係る保護具１０を金属管１に装着した場合、上述のように、フランジ部１２の内側から筒状部１４内にフック２００を挿入することができるので、金属管１の端部にフック２００を引っかけることが可能な状態で該端部を保護することができる。 (Effect of this embodiment)
When the protective tool 10 according to the present embodiment is attached to the metal tube 1, the hook 200 can be inserted into the tubular portion 14 from the inside of the flange portion 12 as described above, so that the end portion of the metal tube 1 can be inserted. The end can be protected so that the hook 200 can be hooked on the hook 200.
　また、本実施形態に係る保護具１０では、フィン１６およびフィン１８がそれぞれ、筒状部１４の全周に亘って設けられている。この場合、フック２００によって金属管１を吊り上げる際に、フック２００の差し込み位置（筒状部１４の周方向における位置）に関わらず、金属管１の内面１ａにフィン１６およびフィン１８を適切に押し付けることができる。さらに、本実施形態では、２つのフィン１６，１８を同時に金属管１の内面１ａに接触させることができる。これにより、金属管１とフィン１６，１８との間に十分な摩擦力を発生させることができる。その結果、フック２００によって金属管１を吊り上げる際に、金属管１から保護具１０が抜け落ちることを十分に抑制することができる。また、保護具１０を取り付けた状態で金属管１を搬送する際にも、金属管１から保護具１０が抜け落ちることを十分に抑制することができる。 Further, in the protective device 10 according to the present embodiment, the fins 16 and the fins 18 are provided over the entire circumference of the tubular portion 14, respectively. In this case, when the metal pipe 1 is lifted by the hook 200, the fins 16 and 18 are appropriately pressed against the inner surface 1a of the metal pipe 1 regardless of the insertion position of the hook 200 (the position in the circumferential direction of the tubular portion 14). be able to. Further, in the present embodiment, the two fins 16 and 18 can be brought into contact with the inner surface 1a of the metal tube 1 at the same time. As a result, a sufficient frictional force can be generated between the metal tube 1 and the fins 16 and 18. As a result, when the metal tube 1 is lifted by the hook 200, it is possible to sufficiently prevent the protective tool 10 from falling out of the metal tube 1. Further, even when the metal tube 1 is conveyed with the protective tool 10 attached, it is possible to sufficiently prevent the protective tool 10 from falling out of the metal tube 1.
　また、本実施形態では、筒状部１４の軸方向において、筒状部１４の中心よりも他端側（フランジ部１２の反対側）にフィン１６が設けられ、さらに、フランジ部１２とフィン１６との間にフィン１８が設けられている。これにより、フック２００によって金属管１を吊り上げる際に、金属管１内において、保護具１０が金属管１に対して傾くことを十分に抑制できる。その結果、保護具１０を金属管１により安定して装着することができる。 Further, in the present embodiment, the fins 16 are provided on the other end side (opposite side of the flange portion 12) from the center of the tubular portion 14 in the axial direction of the tubular portion 14, and further, the flange portion 12 and the fins 16 are provided. A fin 18 is provided between the and. As a result, when the metal pipe 1 is lifted by the hook 200, it is possible to sufficiently prevent the protective tool 10 from tilting with respect to the metal pipe 1 in the metal pipe 1. As a result, the protective device 10 can be stably attached by the metal tube 1.
　また、本実施形態では、フィン１６，１８の高さは、フランジ部１２の高さの１／２以上に設定される。これにより、金属管１に保護具１０を取り付けた際に、金属管１の内面１ａとフィン１６，１８との接触面積を十分に確保することができる。また、本実施形態では、フィン１６の高さは、筒状部１４の軸方向におけるフィン１６とフィン１８との距離未満に設定される。これにより、金属管１に保護具１０を取り付ける際に、フィン１６の先端部がフィン１８と重なることを防止することができる。その結果、保護具１０を金属管１に円滑に挿入することができるとともに、フィン１８を金属管１の内面１ａに適切に接触させることができる。また、本実施形態では、フィン１８の高さは、筒状部１４の軸方向におけるフィン１８とフランジ部１２との距離未満に設定される。これにより、金属管１に保護具１０を取り付ける際に、フィン１８の先端部がフランジ部１２に接触して変形することを防止することができる。これにより、保護具１０を金属管１に円滑に挿入することができるとともに、フィン１８を金属管１の内面１ａに適切に接触させることができる。 Further, in the present embodiment, the heights of the fins 16 and 18 are set to 1/2 or more of the height of the flange portion 12. As a result, when the protective tool 10 is attached to the metal tube 1, the contact area between the inner surface 1a of the metal tube 1 and the fins 16 and 18 can be sufficiently secured. Further, in the present embodiment, the height of the fin 16 is set to be less than the distance between the fin 16 and the fin 18 in the axial direction of the tubular portion 14. Thereby, when the protective tool 10 is attached to the metal tube 1, it is possible to prevent the tip portion of the fin 16 from overlapping with the fin 18. As a result, the protective tool 10 can be smoothly inserted into the metal tube 1, and the fins 18 can be appropriately brought into contact with the inner surface 1a of the metal tube 1. Further, in the present embodiment, the height of the fin 18 is set to be less than the distance between the fin 18 and the flange portion 12 in the axial direction of the tubular portion 14. As a result, when the protective tool 10 is attached to the metal tube 1, it is possible to prevent the tip portion of the fin 18 from coming into contact with the flange portion 12 and being deformed. As a result, the protective tool 10 can be smoothly inserted into the metal tube 1, and the fins 18 can be appropriately brought into contact with the inner surface 1a of the metal tube 1.
（他の実施形態）
　上述の実施形態では、２つのフィン１６，１８を備える保護具１０について説明したが、フィンの数は２つに限定されない。例えば、図１１に示す保護具１０ａのように、３つのフィンが設けられてもよい。なお、図１１の保護具１０ａにおいては、筒状部１４の軸方向においてフィン１８とフランジ部１２との間に、３つ目のフィン２２が設けられている。なお、保護具が３つ以上のフィンを有する場合には、筒状部の軸方向において、フランジ部から最も離れた位置のフィンを第１フィンとし、筒状部の軸方向において第１フィンに隣り合うフィンを第２フィンとする。したがって、保護具１０ａにおいても、フィン１６が第１フィンに対応し、フィン１８が第２フィンに対応する。保護具が３つ以上のフィンを有する場合も、各フィンの高さは、フランジ部の高さの１／２以上に設定されることが好ましい。また、第１フィンの高さは、筒状部の軸方向における第１フィンと第２フィンとの距離未満に設定されることが好ましい。 (Other embodiments)
In the above embodiment, the protective device 10 including the two fins 16 and 18 has been described, but the number of fins is not limited to two. For example, as in the protective device 10a shown in FIG. 11, three fins may be provided. In the protective tool 10a of FIG. 11, a third fin 22 is provided between the fin 18 and the flange portion 12 in the axial direction of the tubular portion 14. When the protective device has three or more fins, the fin at the position farthest from the flange portion in the axial direction of the tubular portion is set as the first fin, and the fin is designated as the first fin in the axial direction of the tubular portion. Adjacent fins are referred to as second fins. Therefore, also in the protective device 10a, the fin 16 corresponds to the first fin and the fin 18 corresponds to the second fin. Even when the protective device has three or more fins, the height of each fin is preferably set to 1/2 or more of the height of the flange portion. Further, the height of the first fin is preferably set to be less than the distance between the first fin and the second fin in the axial direction of the tubular portion.
　上述の実施形態では、各フィンは、筒状部１４の軸方向に直交する方向に平行に延びるように設けられているが、フィンの形状は上述の例に限定されない。例えば、図１２に示す保護具１０ｂのように、複数のフィン１６，１８のうち、フランジ部１２から最も離れた位置のフィン１６がテーパー形状を有していてもよい。具体的には、保護具１０ｂにおいては、フィン１６は、筒状部１４の軸方向に垂直な断面における外縁の周長が、筒状部１４の軸方向においてフランジ部１２に近付くにつれて大きくなるように、テーパー形状を有している。このようにフィン１６がテーパー形状を有していることによって、筒状部１４を金属管１内に差し込みやすくなる。 In the above-described embodiment, each fin is provided so as to extend parallel to the direction orthogonal to the axial direction of the tubular portion 14, but the shape of the fin is not limited to the above-mentioned example. For example, as in the protective tool 10b shown in FIG. 12, among the plurality of fins 16 and 18, the fin 16 at the position farthest from the flange portion 12 may have a tapered shape. Specifically, in the protective tool 10b, the fin 16 has an outer peripheral edge length in a cross section perpendicular to the axial direction of the tubular portion 14 increasing as it approaches the flange portion 12 in the axial direction of the tubular portion 14. In addition, it has a tapered shape. Since the fin 16 has a tapered shape in this way, the tubular portion 14 can be easily inserted into the metal tube 1.
　上述の実施形態では、フランジ部１２の保護面１２ａは、筒状部１４の軸方向に直交する方向に平行に延びるように設けられているが、フランジ部の形状は上述の例に限定されない。例えば、図１３に示す保護具１０ｃのように、フランジ部１２の保護面１２ａがテーパー形状を有していてもよい。具体的には、保護具１０ｃにおいては、保護面１２ａは、筒状部１４の軸方向に垂直な断面における周長が、筒状部１４の軸方向においてフィン１６に近付くにつれて大きくなるように、テーパー形状を有している。このように保護面１２ａがテーパー形状を有していることによって、金属管１の端面１ｂがベベル加工されている場合でも、保護面１２ａによって端面１ｂを適切に保護することができる。 In the above-described embodiment, the protective surface 12a of the flange portion 12 is provided so as to extend parallel to the direction orthogonal to the axial direction of the tubular portion 14, but the shape of the flange portion is not limited to the above-mentioned example. For example, as in the protective tool 10c shown in FIG. 13, the protective surface 12a of the flange portion 12 may have a tapered shape. Specifically, in the protective tool 10c, the protective surface 12a has such that the peripheral length in the cross section perpendicular to the axial direction of the tubular portion 14 increases as it approaches the fin 16 in the axial direction of the tubular portion 14. It has a tapered shape. Since the protective surface 12a has a tapered shape in this way, even when the end surface 1b of the metal tube 1 is beveled, the end surface 1b can be appropriately protected by the protection surface 12a.
　なお、詳細な説明は省略するが、本発明に係る保護具では、各フィンが、筒状部の全周亘って設けられていればよい。したがって、例えば、図１４に示す保護具１０ｄのように、フィン１６が周方向において複数の部分に分割されていてもよい。同様に、フィン１８が周方向において複数の部分に分割されていてもよい。図示は省略するが、フィン２２（図１１参照）についても同様である。 Although detailed description is omitted, in the protective device according to the present invention, each fin may be provided over the entire circumference of the tubular portion. Therefore, for example, the fin 16 may be divided into a plurality of portions in the circumferential direction as in the protective tool 10d shown in FIG. Similarly, the fin 18 may be divided into a plurality of portions in the circumferential direction. Although not shown, the same applies to the fin 22 (see FIG. 11).
　また、上述の実施形態では、フランジ部１２から一方向に延びるように筒状部１４が設けられているが、フランジ部１２から筒状部１４とは反対方向に延びるように他の筒状部がさらに設けられてもよい。また、上述の実施形態では、筒状部１４において、フランジ部１２とは反対側の端部に底部２０が設けられているが、保護具が底部を有していなくてもよい。また、上述の実施形態では、各フィンの高さは略等しいが、各フィンの高さが互いに異なっていてもよい。 Further, in the above-described embodiment, the tubular portion 14 is provided so as to extend in one direction from the flange portion 12, but another tubular portion extends from the flange portion 12 in the direction opposite to the tubular portion 14. May be further provided. Further, in the above-described embodiment, the tubular portion 14 is provided with the bottom portion 20 at the end portion opposite to the flange portion 12, but the protective tool may not have the bottom portion. Further, in the above-described embodiment, the heights of the fins are substantially the same, but the heights of the fins may be different from each other.
　本発明によれば、金属管の端部にフックを引っかけることが可能な状態で該端部を保護することができる。 According to the present invention, the end portion can be protected in a state where the hook can be hooked on the end portion of the metal tube.
　１　金属管
　１ａ　内面
　１ｂ　端面
　１０，１０ａ，１０ｂ，１０ｃ，１０ｄ　保護具
　１２　フランジ部
　１２ａ　保護面
　１４　筒状部
　１６，１８，２２　フィン
　２０　底部
　２０ａ　貫通孔
　１００，１００ａ，１００ｂ　保護具
　１０２　筒状体
　１０４　円板
　１０４ａ　フランジ部
　１０６，１０６ａ　係止部材
　２００　フック 1 Metal tube 1a Inner surface 1b End surface 10, 10a, 10b, 10c, 10d Protective tool 12 Flange part 12a Protective surface 14 Cylindrical part 16, 18, 22 Fin 20 Bottom 20a Through hole 100, 100a, 100b Protective tool 102 Cylindrical body 104 disk 104a Flange part 106, 106a Locking member 200 Hook

Claims (17)

  1. 　金属管の端部に装着される保護具であって、
    　中空かつ環状のフランジ部と、
    　前記フランジ部の内縁部から一方向に向かって延びる筒状部と、
    　前記筒状部の外周面から前記筒状部の軸方向に交差する方向に突出し、かつ前記軸方向において前記フランジ部から離隔して設けられる環状かつ板状の第１フィンと、
    　前記筒状部の外周面から前記軸方向に交差する方向に突出し、かつ前記軸方向において前記第１フィンおよび前記フランジ部から離隔するように前記第１フィンと前記フランジ部との間に設けられる環状かつ板状の第２フィンと、
    を備えた保護具。     A protective device attached to the end of a metal tube
    With a hollow and annular flange
    A tubular portion extending in one direction from the inner edge portion of the flange portion and
    An annular and plate-shaped first fin that protrudes from the outer peripheral surface of the tubular portion in a direction intersecting the axial direction of the tubular portion and is provided apart from the flange portion in the axial direction.
    It is provided between the first fin and the flange portion so as to project from the outer peripheral surface of the tubular portion in a direction intersecting the axial direction and to be separated from the first fin and the flange portion in the axial direction. An annular and plate-shaped second fin,
    Protective equipment with.
  2. 　前記筒状部の前記軸方向に直交する方向において、前記第１フィンおよび前記第２フィンの高さは、前記フランジ部の高さの１／２以上に設定される、請求項１に記載の保護具。 The first aspect of the present invention, wherein the heights of the first fin and the second fin are set to ½ or more of the height of the flange portion in a direction orthogonal to the axial direction of the tubular portion. Protective equipment.
  3. 　前記筒状部の前記軸方向から見て、前記第１フィンに外接する円の直径および前記第２フィンに外接する円の直径は、前記金属管の内径よりも大きい、請求項１または２に記載の保護具。 According to claim 1 or 2, the diameter of the circle circumscribing the first fin and the diameter of the circle circumscribing the second fin when viewed from the axial direction of the tubular portion are larger than the inner diameter of the metal tube. The protective equipment described.
  4. 　前記筒状部の前記軸方向において、前記筒状部の一端に前記フランジ部が設けられ、前記筒状部の中心よりも他端側に前記第１フィンが設けられる、請求項１または２に記載の保護具。 According to claim 1 or 2, in the axial direction of the tubular portion, the flange portion is provided at one end of the tubular portion, and the first fin is provided at the other end side of the center of the tubular portion. The protective equipment described.
  5. 　前記筒状部の前記外周面は、前記軸方向に垂直な断面において円形状を有し、
    　前記フランジ部と前記第１フィンとの前記軸方向における距離Ｈは、下記式（１）で規定される、請求項１または２に記載の保護具。
    　Ｈ≧０．４４７Ａ　・・・（１）
    　ただし、上記式（１）において、Ａは、前記筒状部の外径を示す。     The outer peripheral surface of the tubular portion has a circular shape in a cross section perpendicular to the axial direction.
    The protective device according to claim 1 or 2, wherein the distance H between the flange portion and the first fin in the axial direction is defined by the following formula (1).
    H ≧ 0.447A ・ ・ ・ (1)
    However, in the above formula (1), A indicates the outer diameter of the tubular portion.
  6. 　前記第１フィンは、前記軸方向に垂直な断面における外縁の周長が前記軸方向において前記フランジ部に近付くにつれて大きくなるテーパー形状を有している、請求項１または２に記載の保護具。 The protective tool according to claim 1 or 2, wherein the first fin has a tapered shape in which the peripheral length of the outer edge in a cross section perpendicular to the axial direction increases as the peripheral length approaches the flange portion in the axial direction.
  7. 　前記フランジ部は、前記軸方向における前記第１フィン側から見て環形状を有する保護面を備え、
    　前記保護面は、前記軸方向に垂直な断面における周長が前記軸方向において前記第１フィンに近付くにつれて大きくなるテーパー形状を有している、請求項１または２に記載の保護具。     The flange portion includes a protective surface having a ring shape when viewed from the first fin side in the axial direction.
    The protective tool according to claim 1 or 2, wherein the protective surface has a tapered shape in which the peripheral length in a cross section perpendicular to the axial direction increases as the peripheral length approaches the first fin in the axial direction.
  8. 　前記フランジ部と前記第１フィンとの前記軸方向における距離は９０ｍｍ以上である、請求項１または２に記載の保護具。 The protective device according to claim 1 or 2, wherein the distance between the flange portion and the first fin in the axial direction is 90 mm or more.
  9. 　前記筒状部の前記軸方向に直交する方向において、前記第１フィンの高さは、前記軸方向における前記第１フィンと前記第２フィンとの距離未満に設定される、請求項１または２に記載の保護具。 Claim 1 or 2 in which the height of the first fin is set to be less than the distance between the first fin and the second fin in the axial direction in a direction orthogonal to the axial direction of the tubular portion. Protective equipment described in.
  10. 　前記筒状部の前記軸方向に直交する方向において、前記第２フィンの高さは、前記軸方向における前記第２フィンと前記フランジ部との距離未満に設定される、請求項１または２に記載の保護具。 According to claim 1 or 2, the height of the second fin is set to be less than the distance between the second fin and the flange portion in the axial direction in the direction orthogonal to the axial direction of the tubular portion. The protective equipment described.
  11. 　前記筒状部は、前記軸方向における一端から他端に亘って連続した内面を有している、請求項１または２に記載の保護具。 The protective device according to claim 1 or 2, wherein the tubular portion has a continuous inner surface from one end to the other end in the axial direction.
  12. 　前記金属管の端部に装着された際に、前記第１フィンの両面のうち、前記軸方向において前記フランジ部とは反対側の面が前記金属管の内面に押し付けられ、前記第２フィンの両面のうち、前記軸方向において前記フランジ部とは反対側の面が前記金属管の前記内面に押し付けられる、請求項１または２に記載の保護具。 When attached to the end of the metal pipe, the surface of both sides of the first fin opposite to the flange in the axial direction is pressed against the inner surface of the metal pipe to form the second fin. The protective device according to claim 1 or 2, wherein a surface of both sides opposite to the flange portion in the axial direction is pressed against the inner surface of the metal pipe.
  13. 　前記筒状部の外径は、前記金属管の内径の０．８５倍以上１倍未満である、請求項１または２に記載の保護具。 The protective device according to claim 1 or 2, wherein the outer diameter of the tubular portion is 0.85 times or more and less than 1 times the inner diameter of the metal tube.
  14. 　前記筒状部において前記フランジ部とは反対側の端部に設けられた底部をさらに備える、請求項１または２に記載の保護具。 The protective tool according to claim 1 or 2, further comprising a bottom portion of the tubular portion provided at an end opposite to the flange portion.
  15. 　前記底部に貫通孔が形成されている、請求項１４に記載の保護具。 The protective device according to claim 14, wherein a through hole is formed in the bottom portion.
  16. 　金属管と、
    　前記金属管の端部に装着された請求項１から１５のいずれかに記載の保護具と、
    を備えた保護具付き金属管。     With a metal tube
    The protective device according to any one of claims 1 to 15, which is attached to the end of the metal tube.
    Metal tube with protective equipment.
  17. 　前記筒状部の前記外周面は、前記軸方向に垂直な断面において円形状を有し、
    　前記フランジ部と前記第１フィンとの前記軸方向における距離Ｈは、下記式（２）で規定される、請求項１６に記載の保護具付き金属管。
    　Ｈ≧（Ｄ２－（（Ａ＋Ｄ）／２）２）１／２　・・・（２）
    　ただし、上記式（２）において、Ｄは、前記金属管の内径を示し、Ａは、前記筒状部の外径を示す。     The outer peripheral surface of the tubular portion has a circular shape in a cross section perpendicular to the axial direction.
    The protective metal pipe according to claim 16, wherein the distance H between the flange portion and the first fin in the axial direction is defined by the following formula (2).
    H ≧ (D 2 -((A + D) / 2) 2 ) 1/2 ... (2)
    However, in the above formula (2), D indicates the inner diameter of the metal pipe, and A indicates the outer diameter of the tubular portion.
PCT/JP2020/011078 2019-03-26 2020-03-13 Protective equipment and metal tube with protective equipment WO2020195947A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019058919A JP6591109B1 (en) 2019-03-26 2019-03-26 Protective equipment and metal tube with protective equipment
JP2019-058919 2019-03-26

Publications (1)

Publication Number Publication Date
WO2020195947A1 true WO2020195947A1 (en) 2020-10-01

Family

ID=68234842

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/011078 WO2020195947A1 (en) 2019-03-26 2020-03-13 Protective equipment and metal tube with protective equipment

Country Status (3)

Country Link
JP (1) JP6591109B1 (en)
CN (1) CN212149984U (en)
WO (1) WO2020195947A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5270326U (en) * 1975-11-21 1977-05-25
JPS6143145U (en) * 1984-08-22 1986-03-20 石川島播磨重工業株式会社 Blind cap for steel pipes
JPH08178173A (en) * 1994-12-28 1996-07-12 Nkk Corp Pipe end protection
US20070131738A1 (en) * 2004-03-16 2007-06-14 Erdie End Caps, Llc End caps for tubes and shipping containers formed therefrom
JP2013040644A (en) * 2011-08-12 2013-02-28 Nippon Steel & Sumitomo Metal Corp Plug-type pipe end protection implement
JP2018039547A (en) * 2016-09-09 2018-03-15 有限会社広島ピーエス Resin cap

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0246465B2 (en) * 1987-10-28 1990-10-16 Yasuhiro Mori NEJITSUKIKOKANNONEJIBUHOGOZAI
JPH0425696A (en) * 1990-05-19 1992-01-29 Kubota Corp Tube end protective cap
JP4405194B2 (en) * 2003-02-12 2010-01-27 Ｊｆｅスチール株式会社 Protective equipment and steel pipes equipped with protective equipment
JP4401838B2 (en) * 2004-03-25 2010-01-20 Ｊｆｅスチール株式会社 Protective equipment and steel pipe
JP6971121B2 (en) * 2017-10-19 2021-11-24 積水化学工業株式会社 Joint holding member and joint holding structure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5270326U (en) * 1975-11-21 1977-05-25
JPS6143145U (en) * 1984-08-22 1986-03-20 石川島播磨重工業株式会社 Blind cap for steel pipes
JPH08178173A (en) * 1994-12-28 1996-07-12 Nkk Corp Pipe end protection
US20070131738A1 (en) * 2004-03-16 2007-06-14 Erdie End Caps, Llc End caps for tubes and shipping containers formed therefrom
JP2013040644A (en) * 2011-08-12 2013-02-28 Nippon Steel & Sumitomo Metal Corp Plug-type pipe end protection implement
JP2018039547A (en) * 2016-09-09 2018-03-15 有限会社広島ピーエス Resin cap

Also Published As

Publication number Publication date
JP2020159447A (en) 2020-10-01
CN212149984U (en) 2020-12-15
JP6591109B1 (en) 2019-10-16

Similar Documents

Publication Publication Date Title
US9797461B2 (en) Removable brake cover
US10843308B2 (en) Protector for shot-blasting
EP2015417A1 (en) A corrugated tube and mounting method therefor
JP6876491B2 (en) Cable protection tubes and fittings
WO2020195947A1 (en) Protective equipment and metal tube with protective equipment
JP2007177810A (en) Hose protector and its manufacturing method
JP2007130374A (en) Guide tube for endoscope and endoscope apparatus
JP6889019B2 (en) Spacer for double piping and double piping assembly method
JP6952586B2 (en) Tube end protection cap
JP2004270930A (en) Protective cap
JP2017133676A (en) Pipe joint with union nut and plug body used in joint
JP4457390B2 (en) Apparatus comprising a protective tube and a tube attachment, and method of using a device comprising a protective tube and a tube attachment
EP2988008B1 (en) Tapered roller bearing
JP2009243096A (en) Steel pipe pile
JP6935648B2 (en) Protective tube holder
JP5749601B2 (en) Plug type tube end protector
US20180372366A1 (en) Device for preventing damage, ovaling and compromise of the ends of piping
JP6311521B2 (en) cap
JP2000257778A (en) Inner core
US5419519A (en) Cable radius protector
KR102652681B1 (en) A protector for preventing ball release of ball joint units
JP2004068978A (en) Protective cap of resin for piping
CN105815925A (en) Circulation case safety lock
JP6554069B2 (en) Balance weight and balance weight parallel body
US20200407115A1 (en) Tube holder

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20778921

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20778921

Country of ref document: EP

Kind code of ref document: A1