CZ283996A3 - Screw cap, particularly made of plastic for closing a bottle and the like - Google Patents

Abstract

A screw cap, especially one made of plastic, for closing a bottle or the like, with a cylindrical threaded section having a female thread to be screwed on the male thread of a bottle-neck, connected to the security ring via break points, on which there are inwardly-directed catches to engage with an outer collar on a bottle-neck. The free edge (14) of the cylindrical part (3) has at least one axial projection (15) which engages positively in a recess (17) in the opposite edge of the security ring (11) in the circumferential direction and releasably in the axial direction. This positive toothing ensures that, when the screw cap is first screwed on the neck of a bottle, the webs (10) are not sheared off by increased torques which can be applied if the catches run on the outer collar of the bottle-neck under tension.

Description

Screw cap, especially made of plastic for closing bottle or dog.

Technique

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The invention relates to a screw cap, in particular of plastic, for closing a bottle or the like, with a cylindrical screw portion which comprises an internal thread for screwing onto the external thread of the bottle neck and which is connected via a desired fracture point to a snap ring. they have an inwardly directed latching projection for engaging an external thicken on the bottle neck, wherein the free edge of the cylindrical screw portion has an axial projection that extends into the recess in the opposite edge of the locking ring in a circumferential direction and releasably in the axial direction.

BACKGROUND OF THE INVENTION.

Z pat. DE 41 08 453 A1 discloses a screw cap of this kind in which the inwardly directed snap lugs are hook-shaped, so that when the screw cap is first screwed onto the external thread of the bottle neck, the snap lugs engage beyond a circumferential external reinforcement arranged for locking purposes on the bottle throat. When the screw cap is unscrewed, the hook-shaped latching lugs hold the retaining ring firmly behind the outer reinforcement on the bottle neck, so that torn yokes between the retaining ring and the cylindrical part forming the desired spot and the retaining ring remain on the bottle neck. By re-screwing the screw cap, the retaining ring is loosely held on the bottle neck. This makes it easy for anyone to recognize that the bottle has been opened once.

The lack of this known helical chuck in that a relatively large ment is required if the hook-like latching lugs must move on the snap ring through the reinforcement on the ridge neck. As a result of this high torque, there is a risk that the desired fracture points, formed by thin yokes, between the locking ring and the cylindrical part of the screw cap will already be cut off when screwing, so that the locking ring sits loosely on the neck of the bottle. the bottle first opens and then closes again. The originality of the bottle contents is therefore not recognizable or guaranteed.

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SUMMARY OF THE INVENTION It is an object of the present invention to provide a screw cap of the type in which the risk of tearing off the desired fracture points between the cylindrical part of the screw vortex is reduced.

·. * ring and snap ring when first screwed in.

This object is achieved according to the invention in that the desired fracture points are formed in the circumferential direction between the intersecting surfaces of the projection and the recess.

The basic idea of this solution is that the cylindrical part of the screw cap and the circlip are connected in a circumferential manner in the circumferential direction, but they are releasably connected in the screwing direction. By interlocking with each other for the tile edges of the cylindrical portion and the retaining ring, large torques can be transmitted without causing the two parts to rotate freely, so there is no danger that the desired fracture points connecting the retaining ring in the original condition with the cylindrical portion of the screw cap, they can be cut off or torn off.

The protrusion and the recess are expediently rectangular in shape, preferably in the form of mean dru. In principle, the shafts may be located at any location, e.g., where no protrusions and no recesses engage one another. Suitably, the fracture points are located circumferentially between adjacent surfaces of the protrusions and recesses. Desired fracture points may also be formed by friction bars arranged between the projections and the recesses. Conveniently, the toothing extends over the entire circumference.

Summary obrázků'na YYK £ _± ese

Fig. 1 shows an axial section through an example for guiding the screw cap according to the invention together with the respective bottle neck.

FIG. 2 shows an enlarged view II in FIG

1.

Examples of the invention.

Giant. 1 shows a plastic screw cap 1 according to an exemplary embodiment. It has a bottom 2 and a cylindrical screw part 3 with an internal thread 4 for screwing onto the external thread 5 of the bottle neck 6, which is only partially shown. A seal 8 is provided between the bottom 2 and the leading edge 7 of the bottle neck 6.

The lower edge 9 of the cylindrical part 3 is connected via a yoke 10 to a retaining ring 11 having internal protrusions 12 which, in the illustrated screwed-on state, engage the thickenings 13 on the bottle neck 6.

Giant. 2 shows the view II in FIG. 1. From this it can be seen that the lower edge 14 of the cylindrical part 3 has ob * Z * XZZZ workers' protrusions 15, which engage into corresponding recesses 71 in the retaining ring 11. Between the protrusions 15 and the bottom of the recess 11, an intermediate space 17 is formed in which brackets 10 are provided which hold the circlip 11 on the cylindrical portion.

When first screwing on the screw cap 1 of FIG. 1, the projections 15 apparent in FIG. 1 ensure that the snap ring 11 is also carried together without mutual movement even if a higher torque occurs, which is the case when the reinforcement protrusions 12 slide and move on it with tension. As a result, the thin yokes 10 are secured against shearing or tearing during the screwing process.

The projections 13 need only abut the edge of the projections 16, which is opposite in the screwing-in direction and not necessarily in the opposite direction of the unscrewing. There, for example, in the region between the surfaces 18, 19 and between the dashed areas 20, 21, shaded areas of refraction 22, 23 can be arranged, which serve the same purpose as the desired points of fracture forming the yokes 10, which can then resign.

Claims (1)

P ATSNTOVS CLAIMS 5 f Of Uj Q /7 / 'ζ ~> - Ο ο __, < cn CO ο úióA- ^c ítj 3 i o CD crx Screw cap, in particular of plastic, for closing a bottle or the like, with a cylindrical screw part which comprises an internal thread for screwing onto the external thread of the bottle neck and which is connected to the inwardly directed locking ring via a desired fracture point snap-in protrusions for engagement by external reinforcement on the bottle neck, wherein the free edge of the cylindrical screw portion has an axial projection that extends into the recess against the light edge of the locking ring circumferentially and releasably in the axial direction, the fractures (22, 23) are formed in a circumferential direction between the intersecting surfaces (18, 20; 19, 21) of the projection (15) and the recess