DK141720B - Capsule for closing a bottleneck. - Google Patents

Description

(11) PRESENTATION 141 720 (DENMARK (ευ int.ci.3 b (21) Note 2572/70 (22) Files' on 20 May 1 cjyQ (23) Life day 20 May 1970 (44) The note) presented and ".

Fifth Anniversary Issue published on Jun. lyoO

DIRECTORATE OF ίβΛ. ........ .

PATENT AND TRADE MARKET (30) Prior «* ft * d». .

21 May 1969, 6Ql6k60f FR 11 Sep. 1969, 693Ο888, FR 25 Dec. 1969, 6944549, FR

(71) STE DU BOUCHON COURONNE (CROWN CORK COMPANY FRANCE), 102 and 118,

Route National, 91 Viry-Chatillon, (Eesonne), FR.

i72) Inventor: Antoine Joseph Leenaards, 6 Chemin dee Primeroses, Lausanne, CH.

(74) Plenipotentiary:

Hofman-Bang & Boutard Engineering Company._ · _ (54) Capsule for closing a bottleneck.

The invention relates to a capsule for closing a bottle neck and of the kind specified in the preamble of claim 1.

For example, from the specification of French Patent No. 1,267,161, a bottle capsule of this kind is known, the flat bottom of which forms a good abutment surface against the bottleneck. Also, the bottom forms a abutment surface against the inner rim of the pressing piston used in the pressing of the tightly sealed plastic gasket.

The gasket forms at this known capsule a ring whose outer rim abuts against the cylindrical casing of the capsule. However, the wrapper does not form a good abutment surface for the plunger, and when using capsules of known design, an effective abutment surface cannot be provided for the outer edge of the plunger, which is unfortunate when it is desirable to produce a tightly sealed seal with a sharply defined outer edge facing the cylindrical side surface of the bottle neck, and the portion of the packing material which remains abutting the bottom of the capsule off the rounded end of the bottle neck is poorly utilized.

The invention has for its object to provide a bottle cap with a precisely located tightly sealed packing ring with minimal consumption of packing material, and the packing ring may be so designed that it will only touch either the end surface or the cylindrical side surface of the bottle neck.

This is achieved by providing the capsule with a transition zone of the kind specified in the characterizing part of claim 1. Since the packing material is completely within the curved transition zone of the capsule, the packing ring can be formed by means of a two-edged pressing piston, both of which can form direct impact against either the capsule bottom or the axially inclined transition zone wall, so that the two edges of the packing ring positioned very accurately.

The transverse profile of the transition zone of the capsule as claimed in claim 2 results in a considerable saving of the plastic material necessary for the formation of the packing ring.

The invention is further explained below in connection with the drawing, in which: FIG. 1 is an axial section through an embodiment of a crown capsule according to the invention; FIG. 2 is an axial section through the capsule prior to folding on the neck of a bottle to be sealed by means of a seal lying along the cylindrical side surface of the bottle neck; FIG. 3 shows a similar view after the fold-in; 4-6, corresponding to FIG. 1-3, for a bottle to be sealed by means of a gasket lying along the end surface of the bottle neck, FIG. 7 and 8 are schematic views showing the formation of a gasket of the gasket of FIG. 4-6; FIG. 9 is a sectional view of an axial section through a corresponding prior art capsule; FIG. 10 is a part of the embodiment of FIG. Fig. 8 is a sectional view of a modified embodiment of the capsule according to the invention; 11 shows a bottle neck with an outer bead in the form of a single screw thread; FIG. 12 shows a capsule according to the invention before forming the inner packing ring; FIG. Figure 13 is a plunger for forming the packing ring of the invention; 14 the capsule with the inserted packing ring according to the invention; FIG. 15 the capsule disposed on the bottle neck of FIG. 11, FIG. 16 the capsule of FIG. 15 during the screw-in on the screw thread, and FIG. 17 is an enlarged view of the capsule of FIG. 15 after the fold-in.

FIG. 1-3 show an example of the application of the invention to a crown capsule, in particular a crown capsule to be applied to a bottleneck 10 of a single screw thread 11 bottle, where D is the diameter of the outer contour of the bottleneck except screw thread 11.

The crown capsule according to the invention has, as is known, a circular bottom 12 which is substantially flat or slightly vaulted, and a lateral sheath 13 which is substantially cylindrical or slightly expanded and the free edge of which is split in the form of a dental crown 14. In the embodiment of FIG. 1, the dental crown is folded outwards.

4 141720

Between the bottom 12 and the sheath 13 is inserted an inclined transition zone 15 with a considerable axial height h exceeding one-twelfth of the diameter of the sheath 13. A slant is understood to mean a zone whose boundary lines are displaced between both axially and transversely.

In the embodiment of FIG. 1-3, the transition zone 15 has a substantially circular cross-section of radius R. For a crown capsule with a diameter of the envelope of between 20 and 40 mm, the radius R according to the invention may be between 2 and 5 mm and the corresponding axial height h is between 0.25 and 0.5 of the total axial height H of the capsule.

The capsule is in a known manner provided with a tightly sealing packing ring 16, which in the embodiment shown in FIG. 1-3, the embodiment of the invention throughout is located outside a cylindrical zone 17, the diameter of which is substantially equal to the diameter D of the free end of the bottleneck 10, except for the screw thread 11.

When the capsule is placed on a bottle, as shown in FIG. 2, the packing ring 16 consequently comes into contact only with the outer edge of the bottle neck 10, and during the folding, the packing ring does not flow in the transverse direction over the narrow end edge of the neck 10.

As a result, it is shown in FIG. 3, only a close end along the side.

It is noted in the figures that it is necessary to provide a larger or smaller annular clearance 18 between the cylindrical zone 17 of the capsule and the scoop 13 to obtain a sufficient distance for passage of the screw thread 11 on the bottle neck 10 during the application.

It is also noted that in practice the packing ring 16 is located throughout the transition zone 15.

The FIG. 4-6 relates to a crown capsule specially designed for a bottleneck 30 having a screwdriver, which is divided into several sections 31. Such a screwdriver usually has a smaller thickness than the continuous screwdriver 11 of FIG. 2nd

In this case, the tightly sealed packing ring 36 of the invention is located completely within the cylindrical zone 17 defined above.

5 141720

After applying the capsule, as shown in FIG. 5, the packing ring 36 then only comes into contact with the narrow end edge of the bottle neck 30 and does not flow during the folding along the side of the outer cylindrical rim of the bottle neck 30. Once the capsule is folded in, as shown in FIG. 6, it therefore only provides a tight end closure.

FIG. 7 and 8 show the arrangement of the packing ring 36. The arrangement is carried out by means of a piston 20 with a abutment end surface 21 which is limited by a laterally open annular recess 22 between two end face edges 22A and 22B. A cone surface 23 connects the recess 22 to a cylindrical side surface 24 of the punch.

In a known manner, a suitable amount 25 of a plastic material is formed on the capsule bottom 12 to form the packing ring 36, and this is extruded by means of the mentioned pressing piston 20, as shown in FIG. 8th

The transition zone 15 according to the invention allows the contour 22B of the recess 22 in the punch 20 to be placed against the side of the capsule without the abutment being outside the above cylindrical zone 17. It is the lateral abutment which causes the seal to be compressed by the punch material is deposited within the recess 22 of the punch, which corresponds to the desired bearing of the formed packing ring 36.

The advantage of this transition zone appears better in FIG. 9, which shows a conventional capsule. One will note the unimportant rounding 45. As a result, the packing ring 46 for this capsule, which is provided as indicated above by means of a plunger with a laterally open recess, will necessarily exceed the cylindrical zone 17, because in practice the recess will seek abutment. against the root of the capsule envelope 43. For this reason, the portion 47 of the packing ring 46, which is outside the cylindrical zone 17, will flow sideways at the folding of the capsule on the bottle neck and along the cylindrical outer edge of the neck, and a tight closure will occur. both to the side and to the end.

FIG. 10 shows a modified embodiment which offers an advantageous saving of material to the packing ring. According to this embodiment 6, the transition zone 15 comprises successively: an inwardly concave rounding 15A, which communicates with the capsule shell 13, an outwardly concave edge portion 15B, and an inwardly concave rounding 15C, which connects to the capsule base 12. This embodiment is applicable to the packing ring 16 as well. with sealing to the side as to the seal ring 36 with sealing at the end.

The cross-sectional profile of the tightly sealing seal may also be rounded.

The invention is also not limited to crown caps alone, whether intended for bottles with annular bead or for screw-line beads, but are equally applicable to screw caps, screw caps or mortar caps.

In the foregoing, the number of teeth is not specified in the dental ring 14. The number is usually 21 for a wrapper diameter of about 25 mm, but especially for crown caps for bottles with helical beads, the number may conveniently be greater, for example about or equal to 27, in order to facilitate the manual removal of the capsule.

FIG. 11 shows a bottleneck to be plugged with a cylindrical zone of diameter D, which is the outer diameter of the free end of the bottleneck, a tightly-fitting end face 1 ", a tightly-fitting side face 4", a transition area 2 "between the two tightly-fitting faces and a screw 5 "with a starting point 3". The screw operation of the drawing is shown simply, but it should be noted that the invention also includes bottlenecks with multiple screw threads.

FIG. 12 shows a capsule C 'according to the invention prior to application. The metal is usually made of white metal, which is a cheap metal, with a thickness of between 0.15 and 0.60 mm. It is to be understood that without departing from the scope of the invention, other materials such as an aluminum alloy, tin-free iron, a composition of metal and plastics, etc. can be used.

The capsule C has a flat or slightly vaulted bottom 8 ", a sideways wrapper 9" with a diameter D 2, a transition zone 7 "between the scoop and the bottom, and teeth 10" capable of deforming the scoop 9 "and even the beginning 7 of the transition area 7 The area 7n is bounded by a circular arc whose radius is greater than one-twelfth of the diameter Dj. For example, for a capsule with a diameter Dj between 20 and 40 mm, a transition radius between 2 and 5 mm can be chosen. The transition zone may also be replaced by a circumferential oblique transition zone whose height H *, measured in the direction of the capsule axis, and width L ', measured perpendicular to this axis, lies within the same boundaries soft transition zone 7 ". In the particular case with a flat bottom, a cylindrical casing and a circular arcuate transition zone, the dimensions H 'and L' are identical and equal to the radius of curvature of the circle.

It should also be noted that the number of teeth 10 "may vary. Generally, a relatively large number, for example, 27" is selected to facilitate the manual grip of the capsule upon unscrewing.

FIG. 1J shows a pressing piston P 'by which a tightly sealing seal can be formed on the very inner surface of the capsule C.

The shape of the piston P 'in FIG. 13 allows an accurate placement of the packing ring relative to the bottle neck to be plugged.

Thus, by this method, one can accurately determine both the packing ring's bearing and partly the thickness of the packing ring, which allows an accurate; closely regulating the density of the capsule and the torque. Thus, it is a profound change of this type of capsule, in which the sealing to the side was heretofore obtained by a substantial deformation of the metal and thus could not be precisely controlled.

FIG. 14 shows the packing forming press piston in position in the capsule. A tightly sealed material, usually a thermoset resin (e.g., a plastisol), is distributed in the capsule almost completely along a ring 6 "whose mean diameter D 'is greater than the diameter D of the bottleneck to be plugged. The sealing material which is not present in this ring, forms a retina to protect the metal from contact with the liquid's liquid content.

It is clear that the tightly sealed material can be slightly expanded after the punching, but such an extension must not displace the packing ring, i.e. it must remain enclosed in the form of rings 6 ".

It is noted that within the scope of the invention, by the term 8141720 packing ring, the element constituted by the above ring with the omission of the peritoneum is understood.

Due to the large extent of the transition zone 7 "and also because of the naturally expanded shape of the envelope peculiar to the crown capsules, the two edge surfaces A1 and A ^ of the punch P * can form a fixed abutment against the inner surface of the capsule in points, where this face is inclined towards the axis, precisely defining the bearing of the lateral packing ring 6 ". This precision is a consequence of the dimensions of the transition zone enabling the delimitation of an area capable of accommodating the lateral ring 6 "with a required height and thickness capable of surrounding the tightly closed side surface of a present bottleneck.

FIG. 15 shows the capsule with the packing ring placed over the bottleneck to be plugged prior to the folding process. It is noted that the packing ring 6 "is located along the side of the bottleneck, i.e. near the tightly closed side surface 4". The shape of the punch P 'in FIG. 13 allows an accurate positioning of the packing ring with respect to the bottleneck, and thus, as desired, to regulate the torque and the sealing degree.

FIG. 16 shows the capsule with its packing ring embedded on the bottle opening according to the known technique for crown capsules. It is seen that the metal folds around the bottleneck and abuts the upper side ln, the transition area 2 "and the starting point 3" of the screw thread. The lateral compression of the packing ring provided by the fold-in is limited by the transition area 2 "and the starting point 3" of the screw thread, which can be bothersome, especially in the case of a rather thick screw thread.

This disadvantage is remedied according to the invention by before, during or after the described folding, a deformation of the capsule in between the transition area 2 "and the starting point 3" of the screw passage to produce another compression of the packing ring against the side of the bottle neck to be plugged.

FIG. 17 shows the capsule plugged on the bottle neck. Between the rounding 2 "and the starting point 3" of the screw thread is noted the deformation of the metal which improves the lateral compression of the packing ring.