EP0069085B1 - Improved liquid-tight fastener, especially for cans - Google Patents

Improved liquid-tight fastener, especially for cans Download PDF

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Publication number
EP0069085B1
EP0069085B1 EP82830162A EP82830162A EP0069085B1 EP 0069085 B1 EP0069085 B1 EP 0069085B1 EP 82830162 A EP82830162 A EP 82830162A EP 82830162 A EP82830162 A EP 82830162A EP 0069085 B1 EP0069085 B1 EP 0069085B1
Authority
EP
European Patent Office
Prior art keywords
cap
filling port
fastener
liquid
tight
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.)
Expired
Application number
EP82830162A
Other languages
German (de)
French (fr)
Other versions
EP0069085A1 (en
Inventor
Giovanni Mantovani
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.)
Dox Al Italia SpA
Original Assignee
Dox Al Italia SpA
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 Dox Al Italia SpA filed Critical Dox Al Italia SpA
Priority to AT82830162T priority Critical patent/ATE22047T1/en
Publication of EP0069085A1 publication Critical patent/EP0069085A1/en
Application granted granted Critical
Publication of EP0069085B1 publication Critical patent/EP0069085B1/en
Expired 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
    • B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
    • B65D53/02—Collars or rings
    • 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
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
    • B65D41/28—Caps combined with stoppers

Definitions

  • This invention relates to an improved liquid-tight plastics fastener for cans, which comprises a cap inserted into a filling port and provided in its upper part with an annular projection, an o-ring inserted between the end of the filling port and the annular projection of the cap, and a retaining ring nut screwed onto the filling port.
  • a can fastener of the type indicated above is known from DE-A-2056246.
  • a liquid-tight seal must be able to be attained even with cans produced by economical moulding means, i.e. starting from a plastics tube which is hot-deformed with compressed air in a suitable mould, until it takes the form of the mould.
  • the resultant filling ports have fairly thin walls, an irregular thread and a high tendency to liquid loss through the fastener, when relatively low pressures are exceeded. This drawback becomes worse if it is necessary to make a threaded connection through the cap of a can produced as described, even if the cap is made thicker.
  • the can fastener illustrated in figure 1 comprises a can filling port 1, a cap 3 inserted into the filling port 1 and provided in its upper part with an annular projection, an o-ring 4 inserted between the end of the filling port 1 and the annular projection of the cap, and a retaining ring nut 2 screwed onto the filling port 1.
  • the cap 3 consists of a solid cylindrical piece of plastic material.
  • the portion of the cap 3 which is inserted into the filling port has a height which is substantially the same as the height of the filling port 1 and a diameter which is substantially the same as the internal diameter of said filling port 1, one or more liquid tight threaded connectors 5, 6 being connected to the cap.
  • the o-ring is preferably of Nylon. I have also found that by adopting a circular line of contact between the upper parts of the cap 3 and the ring nut 2, the seal is improved even if vibration is present.
  • the ring nut 2 and cap 3 can be made of suitable thermoplastic material, for example nylon, or metal.
  • the filling port 1 has been designed for the simultaneous patent application in the name of the present applicant entitled: "Containers for distributors of liquids for spraying on to hay and other agricultural products", and for this reason two male threaded connectors (5,6) are shown for the compressed air and for the pressurised liquid.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Packages (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Abstract

This invention relates to an improved can fastener which comprises the can filling port (1), a cylindrical cap (3) provided upperly with a sealing surface and with an annular projection, an O-ring (4) and a ring nut (2). The cap (3) is inserted into the can filling port (1) and the ring nut (2) is then screwed over the filling port (1) after positioning the O-ring (4) at the end of the port.

Description

  • This invention relates to an improved liquid-tight plastics fastener for cans, which comprises a cap inserted into a filling port and provided in its upper part with an annular projection, an o-ring inserted between the end of the filling port and the annular projection of the cap, and a retaining ring nut screwed onto the filling port. A can fastener of the type indicated above is known from DE-A-2056246. A liquid-tight seal must be able to be attained even with cans produced by economical moulding means, i.e. starting from a plastics tube which is hot-deformed with compressed air in a suitable mould, until it takes the form of the mould. The resultant filling ports have fairly thin walls, an irregular thread and a high tendency to liquid loss through the fastener, when relatively low pressures are exceeded. This drawback becomes worse if it is necessary to make a threaded connection through the cap of a can produced as described, even if the cap is made thicker.
  • In fact in prior art caps, for instance the cap described in DE-A-2056246, it is extremely difficult to fit threaded connection through the cap without compromising the liquid-tight seal. I have now found that the aforesaid drawbacks can be completely overcome by using a liquid-tight plastics can fastener of the type indicated in the prior art portion of claim 1 and having the features stated in its characterising portion. The can fastener illustrated in figure 1, comprises a can filling port 1, a cap 3 inserted into the filling port 1 and provided in its upper part with an annular projection, an o-ring 4 inserted between the end of the filling port 1 and the annular projection of the cap, and a retaining ring nut 2 screwed onto the filling port 1. The cap 3 consists of a solid cylindrical piece of plastic material.
  • The portion of the cap 3 which is inserted into the filling port has a height which is substantially the same as the height of the filling port 1 and a diameter which is substantially the same as the internal diameter of said filling port 1, one or more liquid tight threaded connectors 5, 6 being connected to the cap. The o-ring is preferably of Nylon. I have also found that by adopting a circular line of contact between the upper parts of the cap 3 and the ring nut 2, the seal is improved even if vibration is present.
  • I have also found that a perfect seal is obtained if, in particular, the lower part of the cap 3 instead of being cylindrical is slightly conical with a vertex angle of less than 10° in the direction of the can interior.
  • The ring nut 2 and cap 3 can be made of suitable thermoplastic material, for example nylon, or metal.
  • The filling port 1 has been designed for the simultaneous patent application in the name of the present applicant entitled: "Containers for distributors of liquids for spraying on to hay and other agricultural products", and for this reason two male threaded connectors (5,6) are shown for the compressed air and for the pressurised liquid.

Claims (4)

1. A liquid-tight plastics can fastener, comprising a cap (3) inserted into a filling port (1) and provided in its upper part with an annular projection, an o-ring (4) inserted between the end of the filling port (1) and the annular projection of the cap, and a retaining ring nut (2) screwed onto the filling port (1), characterised in that the cap (3) consists of a solid cylindrical piece of plastic material, the portion of the cap (3) which is inserted into the filling port having a height which is substantially the same as the height of the filling port (1) and a diameter which is substantially the same as the internal diameter of said filling port (1), one or more liquid tight threaded connectors (5, 6) being connected to the cap (3).
2. A fastener as claimed in claim 1, wherein a circular contact is provided between the cap (3) and ring nut (2).
3. A fastener as claimed in claim 1 or 2, wherein the lower part of the cap (3) is slightly conical, with the angle at the vertex in the direction of the can interior being less than 10°.
4. A fastener as claimed in one of the preceding claims, wherein one or more liquid-tight threaded connectors (5) and (6) are connected to the cap (3).
EP82830162A 1981-06-19 1982-06-08 Improved liquid-tight fastener, especially for cans Expired EP0069085B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82830162T ATE22047T1 (en) 1981-06-19 1982-06-08 LIQUID-TIGHT CAP FOR CONTAINERS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2245981 1981-06-19
IT22459/81A IT1136694B (en) 1981-06-19 1981-06-19 PERFECTED CLOSURE WITH LIQUID SEAL SPECIES FOR TANKS

Publications (2)

Publication Number Publication Date
EP0069085A1 EP0069085A1 (en) 1983-01-05
EP0069085B1 true EP0069085B1 (en) 1986-09-10

Family

ID=11196580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82830162A Expired EP0069085B1 (en) 1981-06-19 1982-06-08 Improved liquid-tight fastener, especially for cans

Country Status (4)

Country Link
EP (1) EP0069085B1 (en)
AT (1) ATE22047T1 (en)
DE (1) DE3273150D1 (en)
IT (1) IT1136694B (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2056246A1 (en) * 1970-11-16 1972-05-31 Schiemann, Wolfram, Dr.-Ing., 7140 Ludwig sburg Screw cap for threaded connector of canisters
DE2113106C3 (en) * 1971-03-18 1981-07-23 R. von Hünersdorff Nachf. Friedrich Bührer sen. KG, 7140 Ludwigsburg Device for closing the spout of canisters
FR2228005B2 (en) * 1973-05-02 1977-09-02 Cros Modesto
US4116352A (en) * 1976-11-01 1978-09-26 Leonard Russo Sealing device

Also Published As

Publication number Publication date
DE3273150D1 (en) 1986-10-16
IT1136694B (en) 1986-09-03
IT8122459A0 (en) 1981-06-19
EP0069085A1 (en) 1983-01-05
ATE22047T1 (en) 1986-09-15

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