EP0008502A1 - Couvercles pour pots, procédés de fabrication des couvercles et matrices pour la réalisation des procédés - Google Patents

Couvercles pour pots, procédés de fabrication des couvercles et matrices pour la réalisation des procédés Download PDF

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Publication number
EP0008502A1
EP0008502A1 EP19790301494 EP79301494A EP0008502A1 EP 0008502 A1 EP0008502 A1 EP 0008502A1 EP 19790301494 EP19790301494 EP 19790301494 EP 79301494 A EP79301494 A EP 79301494A EP 0008502 A1 EP0008502 A1 EP 0008502A1
Authority
EP
European Patent Office
Prior art keywords
cap
portions
bead
straight portions
skirt
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.)
Granted
Application number
EP19790301494
Other languages
German (de)
English (en)
Other versions
EP0008502B1 (fr
Inventor
Frederick Charles Groom
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.)
Lin Pac Closures & Cans Ltd
Original Assignee
Lin Pac Closures & Cans 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 Lin Pac Closures & Cans Ltd filed Critical Lin Pac Closures & Cans Ltd
Publication of EP0008502A1 publication Critical patent/EP0008502A1/fr
Application granted granted Critical
Publication of EP0008502B1 publication Critical patent/EP0008502B1/fr
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
    • 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
    • B65D41/04—Threaded or like caps or cap-like covers secured by rotation

Definitions

  • Foodstuffs which require heat treatment in the container in which they will be sold, jams being an example, are commonly put into jars, which are closed by metal caps.
  • the jar has an interrupted screw thread, and the cap is applied and removed by a partial turn, while in other cases the jar has a continuous bead, and the cap is applied., by snapping on and removed by prising off.
  • a type of metal cap known as a "twist cap” was introduced, which has the advantage that such caps can be applied to jars at high speed (see, for example, British Patent Nos. 814 703 and 445 7 1 14).
  • the jar neck has an external interrupted multi-start screw thread, and the cap is of sheet metal and (considered in its attitude of use) comprises a top panel, a skirt depending from the- periphery of the top panel, and an internal continuous circumferential bead on the lower edge of the skirt. At intervals around the circumference, this bead is deformed inwards to provide as many internal lugs as there are starts of the thread. Four, six, and eight lugs and starts are usual.
  • twist caps currently manufactured involve considerable wastage, because a proportion of the caps are not within required dimensional limits, and also because the lugs are liable to become damaged during the process of application to a jar. In each case the jar is not properly sealed.
  • the present invention is concerned with a new shape for lugs on a metal cap, and a new method for making such lugs, one version of the resulting product being a new cap which can take the place of a twist cap on jars of existing shape.
  • the new cap likewise is of sheet metal and (considered in its attitude of use) comprises a top panel, a skirt depending from the periphery of the top panel, and an internal continuous circumferential bead on the lower edge of the skirt.
  • the bead (considered in plan) consists of alternate arcuate portions and straight portions, the arcuate portions being at uniform radius from a common centre, and the straight portions being tangent to a common imaginary circle around that common centre.
  • the lugs on the caps require to be uniformly circumferentially spaced. This means that in a can embodying the present invention, and intended for such use, the points of tangency of the straight portions with the imaginary circle should be uniformly spaced around that circle.
  • the number of lugs i.e. of straight portions, is matched to the thread on the jar. For smaller sizes, e.g. 53 to 70 mm nominal diameter, four lugs are usual. For a larger size, e.g. 82 mm nominal diameter, six lugs, or even more, may be preferred.
  • angles between points of tangency of straight portions with the imaginary circle may be 60°, 150°, 150°.
  • the cap is of sheet metal, and comprises a top panel 2, the exact shape of which is no part of the present invention, a skirt 4 depending from the periphery of the top panel, and an internal continuous circumferential head 6 on the lower edge of the skirt.
  • the bead in plan consists of alternate arcuate portions 8, and straight portions 10.
  • the arcuate portions are at uniform radius from a common centre 12.
  • the major part of the skirt 4 is a circular cylinder about an axis through this centre 12, perpendicular to the paper in Figure 3.
  • the arcuate portions subtend about 50° at the centre 12, while the straight portions subtend about 40°.
  • the straight portions are tangent to a common imaginary circle 14 around the centre 12, an arc of that circle being indicated, and the points of tangency are uniformly spaced around the circle 14.
  • the difference between the internal radius of the arcuate portions 8, and the radius of the circle 14 is selected to ensure satisfactory interengagement in use between the straight portions and the external interrupted multi-start screw thread on the neck of a jar to which the cap is to be applied.
  • a suitably-sized blank of sheet metal is formed, by methods which are no part of the present invention, into the partly-manufactured cap having the shape shown in Figure 9.
  • this shape there is a top panel 2, a cylindrical skirt 4' depending from the periphery of the top panel, and an internal continuous circumferential bead 6' on the lower edge of the skirt 4'.
  • This bead 6' is entirely circular in plan, and is only partial, in that the metal, considered in vertical section, is curled through about 180°, while the skirt height is greater than in the finished cap.
  • This partly-manufactured cap is deformed into the shape shown in Figures 1 to 4 by upward movement of a die shown in Figures 5 to 8 and 10 to 12.
  • the die body 15 is circular in plan, with an annular groove 16 which will accept the bea.d 6' over those parts which are to become the arcuate portions 8 in the final cap.
  • the shape of the operative surfaces of the inserts is shown particularly in Figures 11 and 12.
  • the insert includes a groove 18 which is straight in plan. The ends of this groove merge into the ends of the adjacent portions of the interrupted annular groove 16.
  • each insert 17 is accurately located in its channel 19 by its outer end abutting . a dowel 20 in the die.
  • the outer boundary of the groove 18 is extended upwards by a surface having a central convex curved portion 22, and portions 24 in a vertical plane.
  • the curved portion 22 is a small part of a circular cylinder, having its axis inclined, as indicated by the angle a in Figure 11, upwards and outwards relatively to the vertical centre line 25 of the die. A suitable value for this angle is 27 50'.
  • the upper boundary ?2a of this surface (at the level indicated by the line a in Figure 11) is substantially a circular arc, which coincides in plan with the outer boundary of the portions of the groove 16 in the die.
  • the lines 22b and 22c in Figure I? are contours of the surface 22 at the levels indicated by the lines b and c in Figure 11.
  • Figure 13 shows a modified groove 18a, intended to produce a cap with straight portions tilted at about 1° to the plane containing the lower contour of the curved portions.
  • each straight portion is part of a fine-pitch right-hand helix.
  • the advantage of this is that. it is easier to start the assembly of the cap with a jar.
  • With straight portions in a common plane if the circumferential gaps between threads on the jar subtend relatively small angles at the centre compared with the angles subtended by the threads, then there may be difficulty in assembly.
  • the straight portions of the cap each come to rest on the upper flank of a respective one of the threads. If now the cap is turned, the leading parts of the straight portions may not readily pass below the lower flank of the next thread.
  • the major part 26 of the groove 18a has a clockwise angle ⁇ of 1°, while a minor.part 28 has an anticlockwise angle y of 8°.
  • the major part 26 produces the tilted operative part of the respective straight portion of the bead of the cap, while the minor part 28 produces a part of the bead which constitutes a transition to the adjacent arcuate portion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
EP19790301494 1978-08-11 1979-07-27 Couvercles pour pots, procédés de fabrication des couvercles et matrices pour la réalisation des procédés Expired EP0008502B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7833038 1978-08-11
GB3303878 1978-08-11

Publications (2)

Publication Number Publication Date
EP0008502A1 true EP0008502A1 (fr) 1980-03-05
EP0008502B1 EP0008502B1 (fr) 1983-05-04

Family

ID=10498992

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790301494 Expired EP0008502B1 (fr) 1978-08-11 1979-07-27 Couvercles pour pots, procédés de fabrication des couvercles et matrices pour la réalisation des procédés

Country Status (4)

Country Link
EP (1) EP0008502B1 (fr)
DE (1) DE2965316D1 (fr)
GR (1) GR69680B (fr)
PT (1) PT70010A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015157236A1 (fr) 2014-04-11 2015-10-15 Silgan White Cap LLC Fermeture métallique avec tenons d'enclenchement à basse pression

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB445744A (en) * 1935-07-08 1936-04-17 Crown Cork & Seal Co Improved manufacture of container caps for bottles, jars and other receptacles
GB814703A (en) * 1957-10-07 1959-06-10 White Cap Co Closure cap for glass containers
FR1385956A (fr) * 1964-03-12 1965-01-15 Grace W R & Co Fermetures à joints supérieur et de coin pour récipients rigides

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB445744A (en) * 1935-07-08 1936-04-17 Crown Cork & Seal Co Improved manufacture of container caps for bottles, jars and other receptacles
GB814703A (en) * 1957-10-07 1959-06-10 White Cap Co Closure cap for glass containers
FR1385956A (fr) * 1964-03-12 1965-01-15 Grace W R & Co Fermetures à joints supérieur et de coin pour récipients rigides

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015157236A1 (fr) 2014-04-11 2015-10-15 Silgan White Cap LLC Fermeture métallique avec tenons d'enclenchement à basse pression
EP3066017A4 (fr) * 2014-04-11 2017-05-31 Silgan White Cap LLC Fermeture métallique avec tenons d'enclenchement à basse pression
US10364070B2 (en) 2014-04-11 2019-07-30 Silgan White Cap LLC Metal closure with low pressure engagement lugs

Also Published As

Publication number Publication date
PT70010A (en) 1979-09-01
GR69680B (fr) 1982-07-08
EP0008502B1 (fr) 1983-05-04
DE2965316D1 (en) 1983-06-09

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