MXPA98003279A - Closure for a bottle or simi - Google Patents

Abstract

The present invention relates to a closure for a bottle or the like with a closure piece in the form of a lid, with a shoulder directed inwardly from the edge of the closure piece in the form of a lid for locking behind a shoulder directed towards outside on the neck of a bottle or the like, with a substantially cylindrical sealing part that inside the closure piece extends axially from the base thereof, and with a radial shoulder that is formed on the outer side of the sealing part , at a certain distance from the base of the closure piece, and having a diameter that is greater than the internal diameter of the neck of a bottle that should be closed with the closure, so that the sealing surface or the sealing edge formed by the shoulder rests tightly on the inner surface of the neck when closing, which is characterized by the fact that the cross section of the base has a constricted portion that acts as a rotating articulation directly radially to the outside of the cylindrical sealing part, and that the radial shoulder is arranged axially such that it is always in the region of the substantially cylindrical inner surface of the neck of the bottle each time the base bulges outwards as a result of an excess of pressure and, in the case of a bulging out of the base by the lever action of the angular lever rotatable around the rotating joint formed by the base and the sealing part, is discharged from the pressure or is separated by lifting essentially radially from the inner surface of the neck of the bottle

Description

CLOSING FOR A BOTTLE OR SIMILAR Description of the Invention The invention relates to a closure of the type mentioned in the main concept of claim 1, for a bottle or the like. From British patent specification GB 2 013 635 A a closure of the type under consideration is known in which the radial shoulder of the sealing part sits against the inner wall of the neck of the bottle in the region immediately adjacent to the inner edge of its mouth. The cylindrical sealing part is very short and the protrusion of its external surface is close to the base of the closure piece in the form of a lid. The base can be bent elastically to the outside in the case of excess pressure. In the case of a bulge to the outside, the obturator projection follows this movement of substantially axial abomination until, with a determined excess of pressure, and consequently with a determined bulge, it is detached from the inner edge of the mouth of the neck of the bottle, way that it forms a slit through which excess pressure can escape. In this way the closure forms an overpressure discharge valve with which the bottle is prevented from bursting and the consequences associated with it are avoided. A disadvantage of this known closure is that in practice the inner edge of the mouth of the neck of the bottle acting as valve seat has a high degree of imprecision in the manufacture, so that due to this can not be guaranteed a defined seat of the obturator protrusion just in the critical region in which the overpressure relief valve formed by the closure opens and closes again. To this we must add that in the case of returnable bottles, in particular glass bottles, which are used again and again, the internal edge of the mouth of the neck of the bottle presents deteriorations that lead to a lack of stagnancy. Another additional disadvantage of this known closure resides in that with the pressure changes that in practice arise due to the heating and the cooling of the content of the closed bottle with the closure, the sealing shoulder continuously carries out axial sliding movements on the inner leading edge of the mouth of the neck of the bottle acting as a valve seat, which can lead to wear by abrasion or deterioration of the sealing surface of the shoulder, which in turn will lead to a lack of tightness.

A disadvantage of this known closure is finally that the requirement of an axial movableness necessitates an axial resilience of the cover outside the cylindrical sealing part. This requirement is satisfied in the case of this known closure configured as a screw cap by shearing the base outside the cylindrical sealing part and by axial expansion of the outer cylindrical part. However, in the expansion, the pre-tension is introduced which is a function of the moment of rotation of the screw and which in any case depends on the force with which the user threads the screw cap onto the bottle when he uses it. The result of this is that it is not possible to determine exactly the pressure at which pressure relief should happen for safety reasons, but rather that it depends on chance, so that the desired safety is not achieved to prevent the bottle burst if the pressure is too high. British patent publication GB 958 417 discloses a closure similar to that of the type under consideration, which likewise is configured as a screw cap which, inside its base, has projections serving as stops and which, when the screw cap is screwed on a bottle neck, come to settle on the outside on its front edge. due to this, the expansion of the external part of the cap having the thread to provide the base with an axial movability is not used. By virtue of which the elasticity of this axial movableness is determinant for the opening pressurehowever, for flexibility only the region between the cylindrical sealing part and the outer edge of the front surface of the neck of the bottle is available, the base has to be very thin in order to achieve sufficient elastic flexibility. This is disadvantageous, since then manufacturing tolerances will be greatly affected. The object of the invention is to create a closure of the type mentioned in the main concept of claim 1, in which inaccuracies or deterioration of the inner front edge of the mouth of the neck of the bottle and whose action does not adversely affect of leak-tightness is not impaired, even in the case of frequent pressure changes. The task on which the invention is based is solved by the teaching indicated in the feature of claim 1. The fundamental idea of teaching according to the invention is that the opening of the overpressure relief valve formed between the closure and a The neck of a bottle is not made by axial movement of the obturator shoulder of the sealing part, for which the location and constitution of the front inner edge of the mouth of a bottle neck are of decisive importance, but by a radial movement inwards of the obturator protrusion. This radial movement is achieved by providing in the cross section of the base a constricted portion acting as a rotating joint, immediately radially to the exterior of the cylindrical sealing part. This constricted portion leads to the fact that with a bulge outwardly of the base of the closure piece, its edge region, seen in cross section, rotates around the rotating joint formed in this way, while the region that is outside of this area is not substantially affected. By virtue of which the cylindrical sealing part is firmly attached to the base immediately inside the rotating joint, so that an angular lever is formed between the base and the cylindrical sealing part which can rotate around the rotating joint, this means that with a bulge outward from the base, the sealing part tilts inward and the sealing shoulder on its outer surface is discharged from the pressure and, in the case of sufficient pressure, separates from the inner cylindrical surface of the neck the bottle To ensure under all circumstances this radial discharge of the pressure or this separation by radial lifting, in accordance with a particular feature of the invention the radial sealing shoulder is arranged axially such that it lies within the region of the inner surface essentially Cylindrical neck of the bottle during all deformations outward from the base that may occur. These indications are made taking into account essentially an observation of the cross section, in which the cylindrical sealing part actually forms a lever. However, in reality it is effectively a cylinder, so that the lever effect seen in cross section with respect to the circumference actually constitutes a narrowing of the cross section of the cylindrical sealing part. However, this does not affect the effect in the form of a discharge of the pressure or a separation by raising the shoulder. Naturally, within the mechanical conditions, the length and rigidity of the cylindrical sealing part are also considered, but these are nevertheless magnitudes whose determination is within the scope of the general specialist in the area. This also applies to the configuration of the constricted portion of the cross-section of the base of the closure piece in the form of a lid forming a rotating joint. The constricted portion of the cross section must be sufficiently large in the axial direction so that the desired tilting ease is achieved. On the other hand, it must not be so large in the radial direction that an undesirable parallel movement in the axial direction can be caused. In accordance with a refinement of the invention, the closure part has radially to the outside of the constricted portion of the cross section that acts as a rotating joint an axial stop for the seat against a contract of the neck of the bottle facing it. It is convenient that the stop is arranged in the radial region of the front surface of a bottleneck forming the contract. The stop can be formed, for example, simply by a prolongation of the base which abuts against the front surface of a bottle neck, whereby a firm position of the base of the closure in the region of the outer edge is obtained, by means of the which movements of the rotary joint in the axial direction and thus also the axial movements of the sealing surface formed in the shoulder of the sealing part are prevented, thereby also precluding a friction of the sealing surface against the cylindrical inner surface from the neck of the bottle. In this way, this sealing surface can not suffer abrasion and deterioration due to changes due to bulging of the base of the closure piece caused by variations in pressure. Naturally, the axial stop of the closure piece must be configured in such a way as to allow excess pressure to escape through the stop. If the stop is annular, then this relief can be ensured through radial channels or steps. However, in the case of the stop it can also be discrete individual stops, which are arranged distributed around the circumference of the closure piece, whereby they form steps between them. The stop can also be configured in such a way that it comes up against an external shoulder of the neck of the bottle, which will then form the contract. According to a further development of the invention, a rib is provided between the base of the closure cap and the cylindrical sealing portion, which provides rigidity to the angular lever formed by the base and the closure part. In this way the movement of the base to the cylindrical sealing part during the bulging of the base due to the increase of the pressure in a closed bottle is transmitted in a more effective way, by means of which the pressure discharge or a lifting separation is improved. of the shoulder, in particular against the internal pressure acting radially outwards against the sealing part In order to achieve the advantageous effect of the rib in the simplest case, it is sufficient to provide only one rib. Of course it is also possible to arrange several ribs along the circumference, conveniently equidistant from one another. In accordance with a suitable development of this embodiment, in the region of its transition to the sealing part the rib extends axially to a region remote from the sealing shoulder. By this, a region to which rigidity is not provided and which therefore remains elastic is conserved axially between the rib and the shoulder. According to a further development of this embodiment, in the region of its transition to the base, the rib extends to a region radially remote from the axis or from the center of the closure piece. This counteracts a reduction in the bulge of the base by increasing the pressure and, consequently, the effect of the pressure relief valve is improved. Finally, and in accordance with a suitable development of the invention, the constricted portion of the cross section is arranged radially in such a way that the rotating joint formed thereon is located on the theoretical extension of the inner surface of the neck of a bottle. By this location of the constricted portion and thus of the rotating joint, it is ensured that the radial sealing shoulder which sits against the inner wall of a bottle neck is only relieved of pressure or is separated by lifting in the transverse direction with respect to the surface of the inner shirt of the neck of the bottle. By this, the frictional movements of the sealing shoulder in the axial direction along the inner wall of the bottle neck are counteracted, and therefore also the wear and leakage of the seal. With reference to the drawing, the invention will be explained in more detail based on an example of embodiment. The drawing shows in section and partially cut out a closure piece 1 configured as a screw cap, screwed on a neck 2 of a bottle that is represented only with its front part. The closure piece 1 has a base 3 from which a substantially cylindrical sealing portion 4 having a shoulder (5) on its outer side which sits against a cylindrical interior surface 6 of the neck 2 extends axially inwards of the neck 2. The outer diameter of the shoulder 5 is dimensioned a little larger than the diameter of the inner surface 6, such that in the screwed state that is shown, the shoulder 5 seats with a predetermined force against the inner surface 6. That is to say that the shoulder 5 does not come into contact with a front internal edge 7 of the mouth of the neck 2. The base 3 has in its cross section a portion 8 constrained immediately radially to the outside of the sealing part 4, a constricted portion forming a a rotary joint about which the angular lever which is formed by the sealing part 4 and the part of the base 3 which extends radially inward from the constricted portion of the cross section can rotate. An external cylindrical clamping portion 12 of the closure part 1 has on its internal side an internal threading 13 which engages with an external threading 14 of the neck 2 of the bottle. Furthermore, inside the fastening part 12 there is a stop 10 which rests against a contract member 11, which is formed on the front surface of the neck 2 of the bottle. Accordingly, the stop 10 and the contract member 11 determine a precise and particularly firm position of the rotating joint formed by the constricted portion of the cross section. In the region of the angle between the base 3 and the sealing part 4 there is arranged a rib 15 which is fixedly connected with the base 3 and the sealing part 4 and is formed with them in one piece. The rib 15 has a triangular configuration and extends in a radial direction to a region remote from the obturator shoulder 5, but ends nevertheless in a radial region remote from an axis 16. By means of this reduced radial dimension inwards, the stiffening of the base is reduced. 3 in regard to bulges. During use, after filling a bottle of which the neck 2 is part, the lid-shaped closing piece 1 is screwed on the neck 2 until the stop 10 seats against the contract 11. When doing this the shoulder 5 of the sealing part 4 slides on the inner surface 6 of the neck 2 and thus seals the inside of the bottle. If an excess of pressure develops in the bottle, for example because the content with which it is filled is a beverage that develops a gaseous pressure, then the base 3 bulges axially outwards, whereby its edges carry out a turn around the constricted portion 8 of the cross section that forms a rotating joint. This causes a tilting radially inward of the arm formed by the sealing part 4 and thereby a reduction in the force with which the shoulder 5 seats against the inner surface 6 of the neck 2. Given a predetermined excess pressure and thus a bulging predetermined of the base 3, the shoulder 5 is separated by lifting the inner surface 6, so that the excess pressure can escape. As a consequence of this, the bulge of the base 3 is reduced again, so that the shoulder 5 rests again hermetically against the inner surface 6. By means of the rib 15, the transmission to the sealing part 4 of the pivoting movement of the base 3 resulting from the overpressure bulges is improved., rigidity is provided to the angular lever formed by the base 3 and the sealing part 4. As a result, the globally formed pressure relief valve reacts with greater sensitivity and precision to excess pressure. In particular, it is possible to comply with a certain relief pressure even in the case of divergent manufacturing tolerances.

By virtue of the fact that the position of the hinge formed by the constricted portion of the cross section can practically not be modified due to the abutment 10 and the abutment 11, the axial movements of the obturator part 4 are excluded, so that they can not be presented either Relative movements between the shoulder 5 that is on the sealing part 4 and the internal surface 6 of the neck 2. Consequently the sealing does not suffer any damage even if frequent changes of the bulging of the base 3 occur due to frequent changes of pressure. These only lead to modifications of the set pressure of the shoulder 5, which, however, do not exert a negative effect on the sealing.

Claims (1)

1. CLAIMS closes for a bottle or the like with a lid-shaped closure piece, with a shoulder directed inward from the edge of the lid-shaped closure piece to latch behind a shoulder directed outward into the neck of a bottle or the like, with a substantially cylindrical sealing part which, inside the closure piece, extends axially from the base thereof, and with a radial shoulder which is formed on the outer side of the sealing part, at a distance from the base of the closure piece, and having a diameter that is greater than the internal diameter of the neck of a bottle that must be closed with the closure, so that the sealing surface or the sealing edge formed by the shoulder rests tightly on the inner surface of the neck when closing, closure characterized by the fact that the cross section of the base has a constricted portion that acts as a rotating articulation radially outside of the cylindrical sealing part, and that the radial shoulder is arranged axially such that it is always in the region of the substantially cylindrical inner surface of the neck of the bottle each time the base bulges outwards as a result of excessive pressure and, in the case of an outward bulging of the base by the lever action of the angular lever rotatable about the swivel joint formed by the base and the sealing part, is relieved of pressure or separates by lifting essentially radially from the inner surface of the neck of the bottle. Closure according to claim 1, characterized in that radially outside of the constricted portion of the cross section acting as a rotating joint, the sealing part has an axial stop to seat against a contractor facing it in the bottle neck. Closure according to claim 2, characterized in that the stop is disposed in the radial region of the front surface of the neck of the bottle forming contractile surface. Closure according to claim 1, characterized in that in the angle between the base and the sealing part at least one rib is arranged to provide rigidity to the angular lever thereby formed. Closure according to claim 4, characterized in that in the region of its transition to the cylindrical sealing part, the rib extends axially to a region remote from the radial shoulder of the sealing part, Closure according to claim 4, characterized in that in the region of its transition towards the base, the rib ends radially away from the axis of the closure piece. Closure according to claim 4, characterized in that the rib has a triangular shape. Closure according to claim 1, characterized in that the constricted portion of the cross section is arranged radially in such a way that the rotating joint formed by it is on the theoretical extension of the inner surface of the neck. SUMMARY Closing for a bottle or the like comprising a lid-shaped closure piece, a shoulder directed inwardly from the edge of the closure piece in the form of a lid to latch behind a shoulder directed outwardly into the neck of a bottle or the similar; a substantially cylindrical sealing part that inside the closure piece extends axially from the base thereof and; a radial shoulder which is formed on the outer side of the sealing part, at a certain distance from the base of the closing part, and which has a diameter that is greater than the internal diameter of the neck of a bottle that must be closed with the closing, so that the sealing surface or the sealing edge formed by the shoulder rests tightly on the inner surface of the neck when closing. Directly radially to the outside of the cylindrical sealing part (4) the cross-section of the base (3) has a constricted portion (8) acting as a rotating joint. The radial shoulder (5) is arranged axially in such a way that it is located in the region of the cylindrical inner surface (6) of the neck (2) of the bottle each time the base bulges outward as a result of an excess of pressure. If excessive pressure occurs, the base (3) bulges and thus causes the sealing part to swing inwardly around the constricted portion (8) of the cross section of the base, such that the shoulder (5) it separates from the inner surface (6) of the neck (2) of the bottle, and the excess pressure can escape. The sealing effect is permanent and the excess pressure is relieved reliably with the preset overpressure. Drawing