EP0054893A1 - Cap-shaped cover for closing glass containers - Google Patents

Abstract

1. Cap-shaped cover (1) provided with an annular sealing insert (14) and made from relatively soft sheet metal, but which has a certain elasticity and which is used for the mechanical first time sealing of a glass container (2) in the form of a drinking cup, which has a small opening edge bead (22), which is unavoidable from the manufacturing standpoint, or a conically tapering outer wall in the vicinity of the opening edge, the closure being brought about by applying the cover in the sloping position to the container opening, drawing along the cover by the moved past containers beneath it and tilting the cover into the closed position on the container opening, and whose cover side wall (12) is bounded by a flanging (13) of its free edge and projects inwards for engaging behind the opening edge bead (22) or the outer wall of the glass container, can be tapered in the vicinity of the opening edge, the internal diameter of the cover side wall at the projecting points being somewhat smaller than the external diameter of the opening edge of the glass container which is to be engaged behind, characterized in that the inwardly projecting cover sidewall (12) has an uninterrupted, all-round corrugation (15) with the cross-sectional shape of an angular means whose apex is directed inwards and having straight sides (16, 17) and the elastic sealing insert (14) extends on all sides over the inner corner between the cover bottom (11) and the cover side wall (12) to part of the upper side (16) of the cross-sectional shape of the corrugation (15), whose other side (17) is adjacent to the edge flanging (13).

Description

The invention relates to a cap-shaped, provided with a sealing insert lid made of relatively soft, but having a certain elasticity sheet, the side wall is limited by a flange of its edge, and which serves to close in the manner of a drinking cup shaped glass container, either a small one Mouth edge bead or have a conical taper in the immediate vicinity of their mouth.

It is known in the food industry such containers with corresponding lids as packs, in particular for so-called cold fillings such as mustard, mayonnaise and the like. to use.

An already known cover of the type mentioned at the outset is described in German Patent 1,542,411. In this known cover, impressions in the form of axial ribs with an approximately circular-arc-shaped profile are provided on the circumference of the cover side wall at regular intervals on the cover base and end before the flanging. The ribs protrude inward beyond the outer circumference of the container to be closed and are only present in a small, preferably five, number. The ribs have such an inner protrusion over the bead that they experience a permanent deformation in the area of their crossing point with the edge bead of the container in the form of a relatively small bulge in adaptation to the shape of the edge bead when the cover is applied to its final closed position, while the rib ends below the crossing point remain undeformed due to their stiffness.

The placement of lids of the type in question here on the containers provided with the filling can be done mechanically by automatically moving the lids from the side. In each case, a lid is held in an inclined position and a container to be closed is passed underneath it, so that the upper edge of the container is pulled from its holder and dragged along. The cover is attached by applying slight pressure in the axial direction. A closing tool (closing head) serving to exert a radial pressure is not required. Immediately before the lid is pressed onto the container with little force, sterility can be ensured by steaming the surface of the product with a brief steam jet from a nozzle and a vacuum can be created which only needs to be relatively low.

With drinking cup-like glass containers, relatively large manufacturing tolerances can be expected. Nevertheless, such containers can be closed without problems with lids of the type in question here. The known covers mentioned have been used on a large scale for many years. They have proven themselves very well in practice.

Surprisingly, however, it was found that lids of even simpler shapes can be used for the same purposes, the fastening of which on the lid if possible by exercising a relatively slight axial pressure, but without permanent deformation of individual parts of the cover.

The invention is therefore based on the object of designing a lid of the type mentioned at the outset, the attachment of which to the container does not require a closing head, in a particularly simple manner and in such a way that it can be attached to the lid without permanent deformation of individual points.

This object is achieved in that the lid side wall has a single, continuous, inwardly projecting bead, the inner diameter of which is slightly smaller than the outer diameter of the container mouth edge to be gripped by the bead when the lid is in the closed position, so that during the Applying to the container, which is done by placing it in an inclined position, dragging and tilting the lid under slight axial pressure on the container mouth, as a whole undergoes a temporary change in shape due to its inherent restoring force by expansion.

To close the container, this lid can also be brought up from the side to the mouth of the container and then fastened by slight axial pressure. In practice, he can first assume an inclined position, in which the bead grips behind the mouth edge on one side of the container and is then tilted into the closed position under the influence of the axial pressure exerted on it it snaps into the final closed position due to the inherent restoring force.

One possibility for an advantageous further embodiment of such a cover is that the sealing insert covering part of the inside of the cover base extends all the way over the inside corner between the cover base and cover side wall to a part of the cover side wall located above the bead. This ensures that when the lid is tilted during installation, the elastic sealing insert is temporarily deformed by the rigid container mouth edge touching it at one point on the circumference, whereupon it relaxes and its old shape while the lid is tilted into its fastening position occupies. The clear width of the bead in the lid side wall therefore only needs to be a little smaller than the outer diameter of the rim of the container. The force required to press the lid onto its final closed position is very low. Even for repeated opening and closing of the lid during the gradual consumption of the filling material, only slight forces have to be applied.

• Fig. 1 einen Senkrechtschnitt durch einen mit einem Deckel gemäß der Erfindung verschlossenen, nach Art eines Trinkbechers geformten Behälter,
• Fig. 2 den Senkrechtschnitt durch einen ebensolchen Behälter während der ersten Phase der Deckelbefestigung, bei der der Deckel in Schräglage sich zunächst nur an einer Stelle an dem Behälterrandwulst anlegt, der sich in die ringförmige Dichtungseinlage, welche die Innenecke zwischen Behälterboden und Deckelseitenwand überdeckt, einschmiegt.

The invention is explained in more detail below with reference to the drawing, for example. Show it

• 1 shows a vertical section through a container which is closed with a lid according to the invention and is shaped in the manner of a drinking cup,
• Fig. 2 shows the vertical section through such a container during the first phase of the lid attachment, in which the lid initially lies in an inclined position only at one point on the rim of the container, which nestles into the annular sealing insert which covers the inside corner between the container bottom and the lid side wall .

1 is the circular lid, 2 the glass container, which can be shaped like a drinking cup. Only the upper part of the container 2 is shown. The container wall 21 shown here as a hollow cylinder has an unpolished mouth edge, which has a small bead 22 for manufacturing reasons. The lid 1 consists of the lid base 11 and the lid side wall 12, which is delimited by a beaded edge bead 13. An annular sealing insert 14 is attached to the inside of the lid base. It covers an annular zone on the inside of the lid base and extends to the inner corner of the lid base and lid side wall up to part of the lid side wall. In the lid side wall 12 there is a circumferential, inwardly projecting bead 15 in the manner of a self-contained ring, the diameter of which is somewhat smaller than the outside diameter of the mouth edge with the bead 22 of the container to be gripped by the bead 15 when the lid 1 is in the closed position of the lid 1 2nd

In this exemplary embodiment, the bead has the cross-sectional profile shape of an inwardly directed angle with straight flanks 16, 17. It can be produced in a simple manner with the aid of a correspondingly profiled rolling tool. Deviating cross-sectional profile shapes of the bead are also possible.

The edge of the cover side wall here has a flange 17 to the outside. But it can also be flanged inwards.

Furthermore, instead of a wall 21 designed as a straight cylinder, the container to be closed can also have any other wall shape, the mouth of which can be gripped behind by the bead 15 on the lid, for example a shape curved in the manner of a ton or the shape a truncated cone tapering from the mouth to the floor. The container mouth need not have a bulge if the container wall tapers from the container mouth towards the bottom, at least over a certain distance of the container wall.

The lid according to the invention is particularly suitable for fillings to be filled cold, which require only a slight vacuum between the filling level and the lid, which, as mentioned above, can be generated with the aid of a brief steam jet immediately before closing. The vacuum can be checked at any time after the closure, since the lid base 11, when properly vacuumed, has a flat curvature inwards, which would disappear in the event of subsequent ventilation, which is easily ascertainable.

Claims (2)

1. Cap-shaped, provided with a sealing insert lid made of relatively soft, but having a certain elastic diet, the side wall of which is limited by a flange of its edge, for closing in the manner of a drinking cup shaped glass container, which either has a small mouth rim or in the immediate vicinity of it Mouth have a conical taper, characterized in that the cover side wall (21) has a single, continuously running, inwardly projecting bead (15), the inside diameter of which is slightly smaller than the outside diameter of the bead when the cover is in the closed position (1st ) to reach behind the rim of the container mouth, so that during application to the container (2), which takes place by placing it in an inclined position, dragging and tilting the lid (1) under slight axial pressure on the container mouth, as a whole it is temporary due to its inherent restoring force Shape change experienced by expansion. 2. Cap-shaped lid according to claim 1, characterized in that the part of the inside of the lid base (11) covering sealing insert (14) on all sides over the inner corner between the lid base (11) and the lid side wall (12) on a above the bead (15th ) located part of the lid side wall.

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