DE7704381U1 - Folding lid can for filling material held under a pressurized gas, especially for tennis balls - Google Patents

Description

HOFFMANN JSITLE & PARTNF.R

PAT E N TAN WALTE DR. ING. E. HOFFMANN (1930-Wi). Dl PL.-I NG. W. EITLE DR. RER. NAT. K. HOFFMAN N · D I PL.-I NG. W. LEH N

DIPL.-ING. K. FDCHSLE DR. RER. NAT. B. HANSEN ARABELLASTRASSEi (STERNHAUS) D-8000 MO N CH EN 81 TELEFON (089) 9) 1087 TELEX 05-Ü9619 (PATHE)

Alcan Aluminiuinwerke GmbH, 3400 Göttingen

Folded lid can for filling goods kept under a pressurized gas, especially for tennis balls

The invention relates to a folded lid can for filling material kept under a pressurized gas, in particular for tennis balls, in which the cylindrical peripheral wall and the base are seamless and a closable opening is provided for filling the pressurized gas.

The folded lid cans on the market for selling tennis balls consist of three parts, namely cylindrical peripheral wall, which is bent from a sheet metal and soldered along the axially extending seam, and one

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Bottom and a lid, which is folded onto the circumferential wall are. The base or the cover is provided with an opening by means of which, after the filling material has been introduced, pressure gas is filled into the can and which is closed with a drop of tin after filling. The described Cans have essentially two disadvantages. On the one hand, they are of a complicated construction in terms of production technology and therefore only expensive to manufacture. They consist of three parts, the cylindrical wall, the base and the cover, whereby the cylindrical wall must be soldered together and the base and cover must be crimped onto them. For another, suffers a relatively large proportion of the cans already suffer a considerable loss of pressure due to leakage after a short storage time of the pressurized gas, which is released both through the connection points between the circumferential wall and the base or the circumferential wall and the cover as well as through the soldered seam of the circumferential wall.

To improve the tightness of comparable cans has already been proposed, the cylindrical Ümfangswand and to form the floor seamlessly. Seamless can bodies can easily be extruded, in particular made of aluminum or an aluminum alloy. At the free end of such seamless can body can in a simple manner already in the extrusion process a flanged flange for fastening a Rebate cover to be formed. For filling these cans, which are advantageous per se, with pressurized gas, valve devices e.g. Proposed on the bottom, which should obviously serve the purpose of making the filling point as gas-tight as possible, but are relatively complex and therefore expensive in terms of production technology.

In contrast, it is the object of the invention to provide a can of the prerequisites Kind of consisting of a beneficial seamless

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Can body to the effect that this production technology can be produced easily and thus cheaply and still have sufficient gas tightness over long storage times is guaranteed.

This object is achieved in a can of the type required in that the filling opening in the bottom of the can is designed as a simple wall hole and closed by a rubber stopper.

The invention is based on the knowledge that a simple rubber stopper provides sufficient tightness the gas filler opening is achieved. By using a rubber stopper, the filling opening in the bottom of the can be designed as a circular bore that can be easily produced by punching, for example. The solution according to the invention results all in all an extremely simple and therefore cheap can in terms of manufacturing technology, which is suitable for mass production and therefore is suitable for the intended purpose.

Advantageously, the bottom of the can is curved inwards so that even after the rubber stopper has been inserted into the bottom Filling opening results in a good stability of the can, since the rubber stopper is formed in the bottom Cavity comes to rest.

Pushing the rubber stopper into the opening on the bottom After filling the can with pressurized gas, it is particularly easy if, according to a further expedient embodiment of the subject matter of the invention, the filling hole is surrounded by an inwardly narrowing insertion bevel.

An embodiment of the can according to the invention is described with reference to the drawing. Show it:

Fig. 1 is an axial section through the can body of the invention Can and

Fig. 2, the ready-to-sell can.

The can body according to FIG. 1, consisting of a seamless Cylinder 1 and a base 2 formed in one piece with it is made from a plate made of aluminum or aluminum alloy produced by extrusion. The free edge at the open end of the cylinder 1 is simultaneously extruded or bent outwards to form a flanged flange 3 in a later operation. In the bottom 2 is a circular one in the middle Hole 4, which is formed by an inwardly narrowing insertion slope 5 with, for example, an angle of inclination of approx. 45 is surrounded to the can axis, e.g. by punching.

As can be seen from FIG. 2, the bottom 2 is arched inward. This processing step can either be carried out simultaneously with the production of the bore 4 and the insertion bevel 5 or in a separate operation.

As can also be seen from Fig. 2, the inventive Box for packaging tennis balls. After entering the tennis balls The open end of the can body is closed by a tear-open folded lid 6. An airtight connection between the seam lid 6 and the can body is achieved by the flanged edge 7 of the seam lid 6, which the flanged flange 3 of the can body engages.

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Then pressurized gas, e.g. air or nitrogen, is filled into the can through the hole 4 in the bottom 2 of the can body, which serves to prevent the air from escaping from the tennis balls too quickly. As soon as the intended Internal pressure in the can is reached, a rubber stopper 8 is pressed into the opening 4, the hole 4 in extremely simple and yet securely gas-tight. The drawing in of the bottom 2 inwards has to Purpose, the outwardly protruding part of the rubber stopper take up and train the can despite the rubber stopper 8 stable.

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Claims (3)

Protection claims 1. Folding lid can for pressurized gas Filling material, especially for tennis balls, in which the cylindrical peripheral wall and the base are seamless are and a closable opening for filling the Compressed gas is provided, characterized in that the filling opening in the bottom (2) of the can as simple wall bore (4) is formed and closed by a rubber stopper (8). 2. Can according to claim 1, characterized in that net that the bottom (2) is curved inward. 3. Can according to claim 1 or 2, characterized in that the bore (4) from one to the inside narrowing insertion bevel (5) is surrounded. 7704361 26.0 & 77