HU218000B - Screw cap, especially made of plastic, for closing a bottle or 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

BACKGROUND OF THE INVENTION The present invention relates to a screw cap, particularly a plastic, for sealing a bottle or the like. The screw cap has a cylindrical screw portion having an internal thread for screwing on the outer thread of a neck of a bottle, which is connected by forced tear locations to a securing ring (warranty ring) having inwardly securing projections behind an outer rim ring of a bottle.

German patent DE-41 08 453 A1 discloses a screw cap of the kind described in the introduction, in which the inwardly securing projections are hook-shaped, so that when the screw-cap is first screwed onto the outer thread of a bottle neck, the securing projections are snapped behind the circumferential outer ring ring on the neck of the bottle. When unscrewing the screw cap, the hook-shaped protruding projections hold the retaining ring firmly behind the outer rim ring of the bottle neck, so that the constrained rupture sites formed by the thin material bridges between the retaining ring and the cylindrical portion of the screw cap remain open. This guarantees that the contents of the bottle are genuine, as the retaining ring is loosened on the neck of the bottle when the screw cap is re-screwed, so everyone can easily recognize that the bottle has been opened once.

One disadvantage of this known screw cap is that relatively high torque is required when the hook-shaped projections on the securing ring are moved beyond the outer rim ring of the bottle neck. This increased torque runs the risk that the tight bridges formed by the thin material bridges between the locking ring and the cylindrical portion of the screw cap are sheared as they are screwed up, so that the locking ring is positioned loosely on the neck of the bottle, will be resealed. Therefore, the original contents of the bottle cannot be recognized or guaranteed.

It is an object of the present invention to provide a screw cap of the kind described in the introduction, which reduces the risk that the forced tear sites formed by the thin material bridges between the retaining ring and the cylindrical portion of the screw cap will break during the first screwing.

According to the invention, this object is solved by providing at least one axial projection on the free flange of the cylindrical screw part which protrudes in a circumferential and releasable manner into the recess on the opposite edge of the securing ring.

The basic idea of this solution is that the cylindrical part of the screw cap and the securing ring are releasably connected to each other in a twisting direction. Due to the shape-locking engagement of the opposing flanges of the cylindrical portion and the retaining ring, high torques can be transmitted without rotating the two components relative to each other, so that there is no risk that the tensioning points between the retaining ring and the cylindrical portion of the screw cap

The projection and recess are preferably rectangular and preferably have a plurality of protrusions and recesses which are preferably interconnected in a meander fashion. The material bridges should, in principle, be at any location, such as where projections and recesses are not interconnected. Forced breakage points, projections and recesses are circumferentially adjacent surfaces. Forced breaking sites may also be formed by material bridges between protrusions and recesses. The tooth should preferably extend over the entire perimeter.

The present invention will be described in more detail with reference to the drawings, in which:

Fig. 1 is an axial sectional view of an embodiment of a screw cap according to the invention, together with the associated bottle neck,

Figure 2 is an arrow II view at a larger scale.

Figure 1 shows an embodiment of the plastic screw cap 1 according to the invention. The screw cap 1 has a bottom part 2 and a cylindrical screw part 3. The screw part 3 has an internal thread 4 so that it can be screwed onto the outer thread 5 of the bottle neck 6 shown only partially. There is a seal 8 between the bottom part 2 and the front edge 7 of the bottle neck 6.

The lower flange 9 of the cylindrical screw part 3 is connected by bridges 10 to a securing ring 11, within which there are securing projections 12. The locking projections 12 extend behind the outer rim ring 13 on the bottle neck 6 in the shown screwed state.

Figure 2 is an arrow view of Figure 1 in Figure 1. This figure shows that the lower edge 14 of the cylindrical screw part 3 has rectangular projections 15 which fit snugly into the corresponding recesses 16 in the retaining ring 11. An intermediate space 17 is formed between the projections 15 and the bottom of the recesses 16, in which the material bridges 10 are located. The material bridges 10 hold the retaining ring 11 on the cylindrical portion.

When the screw cap 1 is first screwed in as shown in Fig. 1, the projections 15 in Fig. 2 ensure that the locking ring 11 is released without reciprocal movement even if a higher torque occurs. This occurs when the locking projections 12 slide up onto the outer flange 13 and move under tension over the flange 13. In this way, thin material bridges 10 can be secured against shearing or tearing during the winding process.

The recesses underneath the projections 15 need only lie on the opposite edge in the upward direction and not necessarily in the opposite direction in the downward direction. There, for example at the surface 18, 19 and the dotted lines 20, 21, there is a strip break 22, 23 marked with a band. They serve the same purpose as the forced breaking points formed by the material bridges 10, which may then be missed.

Claims (1)

Patent Claim Point A screw cap, in particular of plastic, for sealing a bottle or the like with a cylindrical screw part having an internal thread for screwing on the outer thread of a neck of a bottle and interconnected by forced tear points with a securing ring which extends beyond the outer rim ring there are projections and at least one axial projection (15) on the free flange (14) of the cylindrical screw part (3) which protrudes formally and axially into the recess (16) on the opposite edge of the securing ring (11), the forced rupture sites (22, 23) being formed by circumferentially adjacent surfaces (18, 20; 19, 21) of the projection (15) and the recess (16).