CZ287909B6 - Screw cap, particularly of plastic for closing for instance a bottle - Google Patents

Abstract

The invented screw cap, particularly of plastic for closing for instance a bottle has a cylindrical screw portion (3) with internal thread (4) and intended for screwing on external thread (5) of a bottle neck (6). Said cylindrical screw portion (3) is coupled through the mediation of a required spot of breakage with a safety ring (11) having a downward directed projections (12) for engagement with a reinforcement (13) performed on the bottle neck (6). The cylindrical screw portion (3) free edge (14) has at least one rectangular projection (15) fitting in a corresponding recess (16) made in opposite edge of the safety ring (11) in the direction along circumference thereof, by a shaped contact and releasably in axial direction. In such a manner it is ensured that when the screw cap is screwed on the bottle neck (6) for the first time yokes (10) cannot be cut off even in case of a greater torque when the latch projection (12) slide on the reinforcement (12) and move thereon with a stress.

Description

Screw cap, in particular of plastic, for closing, for example, a bottle

Technical field

The invention relates to a 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 snap ring on which they are located the inwardly directed latching lugs for engaging an external thicken on the bottle neck, wherein the free edge of the cylindrical screw portion has an axial protrusion 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

DE 41 08 453 discloses a screw cap of this kind in which the inwardly directed latching lugs are hook-shaped so that when the screw plug is first screwed onto the external thread of the bottle neck, the latching lugs engage beyond the circumferential external reinforcement arranged for locking purposes on the bottle throat. When the screw cap is unscrewed, the hook-shaped latching lugs hold the snap ring firmly behind the external thicken on the bottle neck, so that the thin yokes between the snap ring and the cylindrical part forming the desired fracture point break off and the snap ring remains on the bottle neck. This ensures originality and retains the retaining ring loosely on the bottle neck when the screw cap is screwed back on. This makes it easy for anyone to recognize that the bottle has been opened once.

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

SUMMARY OF THE INVENTION

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 portion of the screw cap and the snap ring during the first screwing is reduced.

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 to one another in the circumferential direction, but they are releasably connected in the screwing direction. By engaging the opposing edges of the cylindrical portion and the snap ring intermittently, large torques can be transmitted without rotating the two parts relative to each other, so there is no danger that the fracture points connecting the snap ring in original condition to the cylindrical portion of the screw cap can be cut off or torn apart.

The protrusion and the recess are expediently rectangular in shape, which preferably interfere with one another in the form of a meander. The yokes can in principle be located at any point, i.e. where no protrusions or recesses interfere with each other. Conveniently there are places

Of the desired fracture in the circumferential direction between adjacent surfaces of the protrusions and recesses. Desired fracture points may also be formed by yokes disposed between the protrusions and the recesses. Conveniently, the toothing extends over the entire circumference.

Overview of the drawings

Fig. 1 shows an axial section through an exemplary embodiment of a screw cap according to the invention, together with the respective bottle neck.

Fig. 2 shows an enlarged view II of Fig. 1.

DETAILED DESCRIPTION OF THE INVENTION

Giant. 1 shows a screw cap 1 of plastic having 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 shown only partially. 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 by means of yokes 10 to a retaining ring U having internal projections 12 which, in the screwed-on state shown, engage the thickenings 13 on the bottle neck 6.

Giant. 2 shows the view II of FIG. 1. From this it can be seen that the lower edge 14 of the cylindrical part 3 has 25 rectangular protrusions 15 which extend into corresponding recesses 16 in the locking ring 11.

Between the projections 15 and the bottom of the recess 11 is formed an interspace 17 in which brackets 10 are arranged which hold the locking ring 11 on the cylindrical part 3.

When the screw cap 1 of FIG. 1 is first screwed in, the projections 15, apparent from FIGS. 1, 30, also ensure that the locking ring 11 is also carried together without counter-movement even if a higher torque occurs, if the latching lugs 12 on the reinforcement 13 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 protrusions 13 need only abut the edge of the protrusions 16, which is opposite in the screwing-in direction, but not necessarily in the opposite direction of the unscrewing. There, for example, in the region between the boundary surfaces 18, 19 of the recess 17 and between the dashed areas 20, 21 of the protrusion 15, shaded desired fracture points 22, 23 can be provided, which serve the same purpose as the fracture points formed by the yokes 10. which may then fall off.

Claims (1)

A screw cap, in particular of plastic, for closing a bottle, for example, with a cylindrical screw portion 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 snapping on external reinforcement at the 10 bottle neck, the free edge of the cylindrical screw portion having an axial projection that extends into the recess in the opposite edge of the locking ring in a circumferentially circumferential and releasable direction in the axial direction The fractures (22, 23) are formed in a circumferential direction between the boundary surfaces (20, 21) and (18, 19) of the projection (15) and the recess (17).