EP2772449A1 - Einsatz für einen Trommelverschluss - Google Patents

Einsatz für einen Trommelverschluss Download PDF

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Publication number
EP2772449A1
EP2772449A1 EP13157302.4A EP13157302A EP2772449A1 EP 2772449 A1 EP2772449 A1 EP 2772449A1 EP 13157302 A EP13157302 A EP 13157302A EP 2772449 A1 EP2772449 A1 EP 2772449A1
Authority
EP
European Patent Office
Prior art keywords
flange
depression
insert according
insert
drum
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP13157302.4A
Other languages
English (en)
French (fr)
Inventor
Saraf Sudarshan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technocraft Industries (India) Ltd
Original Assignee
Technocraft Industries (India) Ltd
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 Technocraft Industries (India) Ltd filed Critical Technocraft Industries (India) Ltd
Priority to EP13157302.4A priority Critical patent/EP2772449A1/de
Priority to CN201410067643.8A priority patent/CN104015971A/zh
Publication of EP2772449A1 publication Critical patent/EP2772449A1/de
Withdrawn legal-status Critical Current

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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
    • B65D39/00—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers
    • B65D39/08—Threaded or like closure members secured by rotation; Bushes therefor
    • B65D39/082—Bung-rings and bungs for bung-holes
    • B65D39/084—Separated bung-rings made by one element

Definitions

  • the present invention is related to an insert for a drum closure, wherein the insert comprises a flange and a cylindrical collar, said collar comprising a lower sleeve portion for inserting a plug and an upper lip portion to be beaded about an edge of a cylindrical neck surrounding a drum opening, said flange extending radially outward from a lower end of said sleeve portion.
  • Inserts of this kind are typically used for steel drums provided for containing oil, chemical and other liquids such as water, but not restricted to the afore-mentioned liquids.
  • the drum has a circular opening which is surrounded by a more or less cylindrical or conical neck, which may be stamped and pressed from a part of the drum wall.
  • the drum may be of any shape, i.e. having a polygonal or cylindrical cross-section, most commonly in the shape of a cylindrical drum having flat circular top and bottom faces.
  • the opening may be either formed in one of the top and bottom faces and/or in the cylindrical wall.
  • the collar of the insert is sized such as to fit within the neck of the drum opening while the flange abuts the inside of the drum wall more precisely a recessed portion of the drum wall receiving the flange.
  • the collar is inserted within the neck portion of the drum opening, while the flange is arranged within the recessed portion of the drum wall and pressed against the inner wall of said recessed portion surrounding said neck.
  • the recessed portion has a non circular, most commonly octagonal, periphery and so does the flange so that the insert, once the flange is fitted into the recessed portion, is non rotatable about the insert axis since the flange is in a form locking engagement with the non circular periphery of the recessed wall portion.
  • a stamp or die is pressed from the outside around the neck portion and towards the insert, while the flange is pressed against the inner drum wall from the inside, such that a smoothly curved transition from the recessed drum wall portion above the flange and the neck portion is pressed towards the insert.
  • a sealing gasket which is provided about the sleeve portion and immediately above the flange, is compressed and "flows" into the gap remaining between the flange and drum wall and between the cylindrical sleeve portion and neck.
  • the upper surface of the flange extends substantially perpendicular to the outside surface of the sleeve portion, which a more or less sharp transition between these surfaces, which in practice may still have a bevelled or rounded shape having a small radius of curvature of typically less than one mm.
  • the insert is typically fixed within the neck portion of the drum opening by means of the upper lip portion of the collar being beaded about the upper edge of the neck while the gasket is compressed between the said neck and adjacent drum wall portion on the one hand and the sleeve portion and flange of the insert on the other hand.
  • the sealing gasket may have either a rectangular or circular or L-shaped cross-section.
  • the applicable sealing gasket will change its cross sectional shape and partly "flow" or creep into the gaps between the insert drum wall, wherein a substantial part of the gasket will creep in between the upper surface of the flange and the opposing part of the drum wall, while only a smaller part of the seal will extend into the hollow cylindrical gap between the sleeve portion of the insert and the neck portion of the drum.
  • the insert opening may be closed by means of a screw plug.
  • the drums are sometimes subjected to rough treatment, for instance when they are stacked on top of each other, or may fall with the top side down, wherein substantial pressure or blows may act on the top of the insert, wherein the closure and in particular the insert is pressed inwardly, such that the drum wall surrounding the insert is deformed and the pressure between the flange and the adjacent wall portion and acting on the gasket there between is released.
  • an upper surface of the flange adjacent with the sleeve portion comprises a circumferentially extending depression.
  • the depression has the surprising effect that, when pressing the neck wall and adjacent wall portion towards the flange and collar or sleeve of the insert, the flow resistance of the gasket for flowing or creeping towards the gap between the flange and wall portion substantially increases such that the gasket, rather than creeping into the gap between flange and drum wall, flows more prominently into the hollow cylindrical gap between the sleeve portion of the insert and the neck portion of the drum surrounding the drum opening.
  • this cylindrical gap is better filled up to a higher level, even a deformation of the drum wall in the vicinity of the insert would not cause the gasket to come out of engagement with both, the sleeve portion and the neck portion, i. e. the sealing action is maintained.
  • this does not require a particular cross-sectional shape of the gasket which may be of a standard rectangular or simple circular cross sectional shape, and does also not require more than a single gasket to be applied around the sleeve portion.
  • the depression is defined by a surface which in cross-section is either smoothly curved and/or comprised of straight sections joining one another under relative angles of at most 45 and preferably 30 degrees or less than 30 degrees.
  • the depression should comprise a round or only bevelled transition towards the outer surface of the sleeve portion.
  • the depression should have the form of a shallow groove.
  • Such a depression is defined in cross sectional shape by a curved portion with Radius R (>0,5 mm) starting tangentially from the cylindrical wall (collar) of the insert and extending about an angle of slightly more than 90° with a smooth (tangential) transition to a straight, flat portion slightly raising by an angle ⁇ (10 to 20 degrees increase) and merging into the flat horizontal radially outer portion of the flange, whereby a flat groove is defined having a depth between 0,6 and 1,5 mm, depending on the pitch and radial extension of the increasing flat portion.
  • a maximum angle by which the surface of the depression may be inclined with respect to a radially outer portion of the flange should be smaller than 45° and preferably within the range from 10 to 30°.
  • the depth of the depression when measured from the level defined by the radially outward portion of the flange, should be less than 4 mm but definitely more than 0,3 mm, preferably in the range from 0,5 to 2,5 mm, in particular 0,6 to 1,5 mm.
  • the width of the respective depression, measured from the wall of the sleeve portion should be more than 3 mm and less than 12 mm, typically around 5 mm
  • the flange portion radially outward of said depression extends along a plane perpendicular to the axis of the closure has a flat annular shape, in particular a flat rectangular cross-section.
  • the periphery of the flange may have a polygonal, preferably an octagonal shape in a top view on the insert (i. e. seen along the axis thereof).
  • the flange has a substantially uniform thickness, the depression being formed by forging or pressing a flat annular flange, such as by clamping a radially outer portion of the flange between two oppositely arranged jaws and pressing the sleeve and a radial inward portion of the flange downward, whereby the radii and slopes of the depression are determined by the material parameters of the flange and collar, the wall thickness and generally geometry thereof etc.
  • the flange may also be formed between a corresponding stamp and die in order to get a well defined cross sectional shape of the depression.
  • the sleeve portion may comprise a female thread, while the lip portion to be beaded about the upper edge of a neck portion surrounding the drum opening may have a wall thickness which is substantially less than that of the sleeve portion.
  • the lip portion may have a wall thickness in the order of 1 mm ⁇ 0,5 mm, while the sleeve portion is between 50 and 100 % thicker than the lip portion.
  • the insert may also be provided with a gasket, wherein a single annular gasket is sufficient in order to provide an improved sealing action.
  • the respective gasket should be made from a pliable, resilient plastic material and the plastic material may be one of or a combination of two or more of the materials of the group which includes EPDM, resin and nitrile rubber resin.
  • Figure 1 shows an axial cross-section through an insert 10 which is basically comprised of a substantially cylindrical collar 2 and a circumferential flange 1 extending about the periphery of the lower edge of collar 2.
  • the collar 2 in turn is comprised of two portions, namely a lower sleeve portion adjacent to the flange 1 having a thicker wall than an upper lip portion 5 which is intended to be beaded about the upper edge of a drum neck as will be shown in figure 4 and 5, respectively.
  • the periphery of the flange 1 may be polygonal, in particular octagonal.
  • the lip portion 5 of the collar 2 is beaded about the upper edge of a drum neck in order to firmly connect the insert with the drum wall in the finally mounted position.
  • the sleeve portion 3 is provided with a female thread for receiving in a threaded plug 4 after the drum is filled with any liquid or generally fluid material.
  • the flange in turn is comprised of an outer, flat annular section 8 and an inner beaded portion 9, forming a depression 7, which has the shape of a shallow groove.
  • the upper surface 6 within the depression 7 may be smoothly curved in cross-section, i.e. comprising a minimum radius of curvature which is 1 mm, preferably about 2 to 3 mm.
  • the surface of the depression 7 when seen in a cross-section according to figure 1 might also be comprised of straight portions slightly angled with respect to each other, wherein the angle between adjacent portions should be at most 45° and preferably smaller than 30°.
  • the cross-section of the depression 7 may also comprise both, curved and straight sections such as shown in figures 2b and 2c .
  • the in cross sectional shape of the embodiment of figure 2c is defined by a curved portion with Radius R (about 2,5 mm) from the cylindrical wall (collar) of the insert extending about an angle of slightly more than 90° (more precisely about 100" to 110°, such as 105°) with a smooth transition to a straight, flat portion b slightly raising by an angle ⁇ (10 to 20° increase, such as 15°) and merging into the flat horizontal radially outer portion of the flange, whereby a flat groove is defined having a depth d between 0,6 and 1,5 mm, depending on the pitch and radial extension of the increasing flat portion.
  • the width w of such depression may be in the range of 3 to 8 mm, preferably about 5 mm.
  • a prior art insert 10' comprising substantially the same kind of sleeve 3 and lip 5, has a plane, flat annular flange without any depression adjacent the sleeve portion. Rather, the transition from the flange towards the sleeve portion may be slightly bevelled or rounded. In the remainder, however, the upper surface of the flange 1' is completely planar.
  • the transition from the flange towards the sleeve portion may be about the same, i.e. comprising a 45° bevel or preferably a smoothly curved transition, however, in the remainder the flange comprises a depression 7 immediately adjacent the transition towards the sleeve portion 3.
  • the depression 7 has substantially the shape of a shallow groove, which still has a remarkable effect when applying a gasket about the sleeve portion immediately above said depression 7.
  • figures 3 and 4 are showing the comparison of a prior art insert equipped with two different gaskets around the sleeve portion on top of each other with an insert and gasket according to the present invention.
  • the gaskets of the prior art device in figure 3a are provided in the form of two sealing rings having a rectangular cross-section.
  • the gaskets In order to provide an appropriate sealing action even upon deformation of the drum surface in the vicinity of the insert, the gaskets have a different size and are made of different materials.
  • the present invention only requires a single gasket which is placed at least partly within or immediately above the depression 7 and surrounds the lower part of the sleeve portion 3.
  • the insert is placed against the inside of a drum wall 12 as shown in figure 4 , such that the sleeve portion is received substantially concentrically with respect to a neck portion 11 of the drum wall while the flange 1 is received within a correspondingly shaped depression provided in the drum wall about the periphery of the neck portion 11, wherein the lip portion, originally extending beyond the upper edge of the cylindrical neck 11 is beaded and folded back about the upper edge of the neck 11 as shown in figures 4a and 4b , respectively.
  • corresponding tools are provided which are pressing the neck 11 and in particular the transition portion from the neck 11 towards the wall 12 extending parallel to the flange 1 and forming a depression in the drum wall, is pressed towards the gasket, such that the gasket(s) is (are) compressed and starts to flow and creep into the gap which still remains between the neck 11 and the sleeve portion 3 and between the wall portion 12 and flange 1, respectively.
  • gasket 20 due to the depression 7 in the upper face of the flange 1 according to the present invention, the same type of gasket 20 as gasket 20' has a stronger tendency to deform and flow or creep upward into the cylindrical gap between neck 11 and sleeve portion 3 while only a minor part of the gasket 20 remains between flange 1 and wall portion 12.
  • this new type of insert having a flange with a depression in the upper surface and extending adjacent an about a sleeve portion 3, saves cost and improves the tightness of the sealing action.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
EP13157302.4A 2013-02-28 2013-02-28 Einsatz für einen Trommelverschluss Withdrawn EP2772449A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13157302.4A EP2772449A1 (de) 2013-02-28 2013-02-28 Einsatz für einen Trommelverschluss
CN201410067643.8A CN104015971A (zh) 2013-02-28 2014-02-26 桶盖的插入件

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13157302.4A EP2772449A1 (de) 2013-02-28 2013-02-28 Einsatz für einen Trommelverschluss

Publications (1)

Publication Number Publication Date
EP2772449A1 true EP2772449A1 (de) 2014-09-03

Family

ID=47779932

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13157302.4A Withdrawn EP2772449A1 (de) 2013-02-28 2013-02-28 Einsatz für einen Trommelverschluss

Country Status (2)

Country Link
EP (1) EP2772449A1 (de)
CN (1) CN104015971A (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946894A (en) * 1974-11-11 1976-03-30 American Flange & Manufacturing Co. Inc. Drum closure
US4677730A (en) 1983-05-12 1987-07-07 Yamato Iron Works Co., Ltd. Method of attaching press-in flange to drum or like container
US4706836A (en) 1987-01-23 1987-11-17 Allen-Stevens Drum Accessories Corp. Leak-resistant drum seals
WO1993010986A1 (en) * 1991-12-05 1993-06-10 Koninklijke Emballage Industrie Van Leer B.V. Drum with drum closure
WO2003062079A1 (en) * 2002-01-22 2003-07-31 Sudarshan Madhoprasad Saraf An improved grooved rolled thread flange fitted on the drum top as a closer
US20050269335A1 (en) 2004-05-21 2005-12-08 Saraf Sudarshan M Grooved rolled threaded flange

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB943148A (en) * 1961-05-10 1963-11-27 Leer Ind Ltd Van Improvements in or relating to bung-hole constructions and method of making the same
GB1392603A (en) * 1971-08-05 1975-04-30 Drums Ltd Containers
US4852238A (en) * 1988-06-13 1989-08-01 Robert G. Evans Drum closure and method of making
AU2003202017B2 (en) * 2002-01-17 2008-02-14 Greif International Holding B.V. Closure plug
US6722519B2 (en) * 2002-02-08 2004-04-20 Rieke Corporation Container and method for preventing leakage therefrom through isolating deformation in the container
CN101508363A (zh) * 2008-02-15 2009-08-19 张连元 钢桶封闭器钢制d型桶塞定位件及制造和定位方法
EP2468653B1 (de) * 2010-12-14 2013-06-05 LANXESS Deutschland GmbH Spundlochdeckel

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946894A (en) * 1974-11-11 1976-03-30 American Flange & Manufacturing Co. Inc. Drum closure
US4677730A (en) 1983-05-12 1987-07-07 Yamato Iron Works Co., Ltd. Method of attaching press-in flange to drum or like container
US4706836A (en) 1987-01-23 1987-11-17 Allen-Stevens Drum Accessories Corp. Leak-resistant drum seals
WO1993010986A1 (en) * 1991-12-05 1993-06-10 Koninklijke Emballage Industrie Van Leer B.V. Drum with drum closure
EP0614434A1 (de) 1991-12-05 1994-09-14 Leer Koninklijke Emballage Fass und zugehöriger fassverschluss.
EP0614434B1 (de) 1991-12-05 1995-11-02 Koninklijke Emballage Industrie Van Leer B.V. Fass und zugehöriger fassverschluss
WO2003062079A1 (en) * 2002-01-22 2003-07-31 Sudarshan Madhoprasad Saraf An improved grooved rolled thread flange fitted on the drum top as a closer
US20050269335A1 (en) 2004-05-21 2005-12-08 Saraf Sudarshan M Grooved rolled threaded flange

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"PACKAGING - STEEL DRUMS - PART 3: INSERTED FLANGE-TYPE CLOSURE SYSTEMS", BRITISH STANDARD - BS ISO 15750-3:2002, 11 June 2002 (2002-06-11), pages 3PP, I - IV, 1 - 43, 1PP, XP003034066

Also Published As

Publication number Publication date
CN104015971A (zh) 2014-09-03

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