DE8717837U1 - Barrel made of thermoplastic material by blow moulding - Google Patents

Description

Andrejewsid, ftefrifef &RdAnM; PateMfcvttvähe in Essen

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Description:

The invention relates to a barrel made of thermoplastic material by blow molding in a blow mold divided into two along a butt seam, with a one-piece barrel body made of barrel casing and barrel bottoms, in particular a barrel made of thermoplastic material with rolling hoops molded onto the transition area between barrel casing and barrel bottoms, with at least one of the barrel bottoms having two bungholes with bunghole closures opposite one another in the area of the butt seam of the blow mold, which are arranged at a predetermined bunghole distance from the barrel casing or from the associated rolling hoop. The invention also relates to a method for producing such a barrel. - If rolling hoops are provided, they generally have an angular cross-sectional profile. The term bunghole stands, as is usual in practice, as pars pro toto for the components that form the bunghole. The bunghole closure is usually a screwed-on lid closure. It is understood that the bungholes are arranged in surrounding barrel bottom recesses.

In the barrel of this type (known from practice), the bungholes are arranged in the area of the butt seam of the blow mold, which is split in two in the longitudinal direction, so that the bungholes can be easily removed during blowing. The requirements that must be placed on the structural strength and stability of the barrel in the transition area between the barrel shell and the barrel bottoms or in the rolling hoop area require that the bunghole spacing is relatively large. If it is a barrel with rolling hoops, the bunghole spacing should be two to three times the bunghole diameter. In a radial section, a step therefore appears.

Andre|ewski,T4onk4.& PaiMb^Taientamirahre in Essen

considerable step height between the bunghole and the barrel casing. It is therefore not possible to completely empty the barrel by simply tipping it and pouring it out through one of the bungholes, while the other is used to ventilate the interior of the barrel.

The invention is based on the object of further developing a barrel of this type in such a way that it can be completely emptied without any problems.

To solve this problem, the invention teaches that at least one of the barrel bottoms has an additional full-drainage bunghole outside the area of the butt seam of the blow mold, which has a full-drainage distance from the barrel casing or the associated rolling tire that is smaller than the bunghole distance, that the full-drainage bunghole consists of a bunghole collar molded onto the barrel bottom and protruding outwards and a bunghole nipple made of thermoplastic material attached to it with a sleeve part, and that the sleeve part and the bunghole collar are welded together. According to a preferred embodiment of the invention, the full-drainage bunghole in the barrel bottom is arranged with the other two bungholes in an area that is opposite the connecting line of the other two bungholes. The full emptying distance should normally be at least half smaller than the bunghole distance. Preferably, however, the arrangement is such that the full emptying bunghole is flush with the barrel shell with its inner circumference or is connected to the barrel shell with a step corresponding to a maximum of the barrel shell wall thickness.

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& MrIrMr, PofMtrdrf^rre in

The invention is based on the knowledge that in a barrel of the type in question, which meets all requirements in terms of structural strength and stability, a third bunghole can be fitted flush with the barrel casing or with a slight step above the barrel casing without affecting the structural strength or stability. The bunghole arranged in this way can be used to completely empty the barrel. It is particularly advantageous that the additionally provided complete emptying bunghole according to the invention can be manufactured in a simple manner. For this purpose, a thermoplasticized hose made of a suitable plastic is inserted into a closed blow mold divided in two along a butt seam and the hose is blown up in the blow mold to form a one-piece barrel made of barrel casing and barrel bottoms, whereby bungholes opposite one another are formed in at least one barrel bottom in the area of the butt seam of the blow mold and can be molded onto the barrel casing at the same time. and proceed in such a way that during the blowing process, outside the area of the butt seam of the blow mold adjacent to the barrel shell, a cylindrical protuberance is formed in at least one barrel base by blowing, that the head of the mold is removed after demolding and sufficient cooling of the barrel, leaving a bunghole collar and that a bunghole nipple with a socket section, preformed e.g. by injection molding, is welded onto the bunghole collar. It goes without saying that the bunghole nipple with its socket section must be made of thermoplastic. To implement this process, existing,

Andrejewski, Honke & Partner, patent attorneys in Essen

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fC,v blow molds set up for the production of the known barrels, divided into two along a butt seam, can be converted so that the barrels according to the invention can be produced. It is also particularly advantageous that different bunghole nipples can be placed on the bunghole collar of barrels according to the invention, and these differ in terms of diameter or thread for the bunghole closure of this full-emptying bunghole.

In the following, the invention is explained in more detail with reference to a drawing which merely represents an exemplary embodiment. Bs show a schematic representation

Fig. 1 is a longitudinal section through a barrel according to the invention in the plane of the usually arranged bungholes which are diametrically opposed to each other,

Fig. 2 is a section in direction A-A through the article according to Fig. 1, Fig. 3 is a plan view of the article according to Fig. 1, Fig. 4 shows the enlarged section B of the object of Fig. 1, Fig. 5 shows the enlarged section C of the object of Fig. 2,

Fig. 6 corresponding to Fig. 5 a section of a barrel according to the invention before completion to explain the manufacturing process and

Fig. 7 corresponding to Fig. 6 is a sketch explaining another stage of the manufacturing process.

Andre jewski,,Hqnlc$ 8t Fjartrver,:Pat'enfqnvyälte in Essen

The barrel shown in the figures was produced by blow molding in a blow mold that is divided into two parts along a butt seam 1. It is made of thermoplastic. The blow mold has not been drawn. In Fig. 3, the dot-dash line indicates the butt seam 1 of the blow mold that is not shown.

The barrel has a one-piece barrel body made up of barrel casing 2 and barrel bottoms 3. In the exemplary embodiment and according to the preferred embodiment of the invention, the barrel has molded-on rolling hoops 4 in the transition area between barrel casing 2 and barrel bottoms 3, which have an angular cross-sectional profile. The upper barrel bottom 3 is provided in the area of the butt seam 1 of the blow mold with two bungholes 5 opposite one another with bunghole closures 6, which have a predetermined bunghole distance SA from the associated rolling hoop 4 and thus also from barrel casing 2. The bungholes 5 are located in surrounding depressions 7. The barrel base 3 has an additional full-emptying bunghole 8 outside the area of the butt seam 1 of the blow mold. This has a full-emptying distance VA from the rolling tire 4 and thus from the barrel casing 2, which is smaller than the bunghole distance SA. The full-emptying bunghole 8 consists, as can be seen in particular in Fig. S, of a bunghole collar 9 molded onto the barrel base 3 and protruding outwards, and a bunghole nipple 11 made of thermoplastic material attached to it with a sleeve section 10. The sleeve section 10 and the bunghole collar 9 are welded together. The full-emptying bunghole 8 is arranged in the barrel base 3 with the other two bungholes S in an area which is opposite the connecting line of the other two bungholes 5. You can see that

Andrefewsld, Honte & Ptirtntt, Pofctttfcwiwtilt· in Etun

especially from a comparative examination of Fig. 2 and 3. The full emptying distance VA is chosen to be as small as possible in the example. It can be seen from Fig. 5 to ? that the full emptying bunghole 8 is flush with its shell-side inner circumference or at a maximum of the wall thickness d of the barrel shell 2.

] Mare 12 is connected to the barrel casing 2. This enables full emptying via the full emptying bunghole 8 by simply tipping it over while ventilating the barrel interior via at least one other bunghole j 5. The full emptying distance VA should be at least half smaller than the bunghole distance SA.

The method involves the blowing process of forming a cylindrical protuberance 13 in a barrel base 3 by blowing outside the area of the butt seam 1 of the blow molds adjacent to the barrel shell 2. This can be seen in Fig. 6. In the next process step, the head of the protuberance 13 is removed after the barrel has been demolded and cooled sufficiently. However, a bunghole collar 9 remains, as can be seen in Fig. 7. The next process step can be seen when looking at Fig. 5, which shows a section of a finished barrel according to the invention. A bunghole nipple 11, preformed for example by injection molding, with a socket section 10 is welded onto the bunghole collar 9.

Claims (4)

Andrejewsla, Henlfe & toöne^Rtnertfiimiräite hi Essen Protection claims: 1. Fabric made of thermoplastic material by blow moulding in a mould divided into two parts along a fabric seam, - with one-piece barrel body made of barrel casing, folding bottom, especially barrel made of thermoplastic material with roller tires molded into the transition area between barrel casing and barrel bottoms, wherein at least one of the barrel bottoms in the area of the butt seam of the blow mold has two bungholes with bunghole closures that are opposite one another and are arranged at a predetermined bunghole distance from the barrel shell or from the associated rolling hoop, characterized in that at least one of the barrel bottoms (3) has an additional full-emptying bunghole (8) outside the area of the butt seam (1) of the blow mold, which has a full emptying distance (VA) from the barrel casing (2) or the associated rolling tire (4) that is smaller than the bunghole distance (SA), that the full-drainage bunghole (β) consists of a bunghole collar (9) molded onto the barrel bottom (3) and projecting outwards, and a bunghole nipple (11) made of thermoplastic material, which is placed thereon with a socket part (10), and that the socket part (10) and the bunghole collar (9) are welded together. 2. Barrel according to claim 1, characterized in that the full-emptying bunghole (6) in the barrel bottom (3) is arranged with the other two bungholes (5) in a region which is opposite the connecting line of the other two bungholes (5). &bull; · · t t ItI « &bull; t · I (Il I I I · · «It« Il <■ ta *'* · inc d I V &Rgr;&Ogr;&pgr;&bgr;&Mgr;&Bgr;&eegr;&Igr;&Mgr;/&Ogr;&eegr;&Igr;&bgr; Hl εGμβαλ 3. Barrel according to one of claims 1 or 2, characterized in that the full emptying distance (VA) is at least half smaller than the bunghole distance (SA). 4. Barrel according to one of claims 1 to 3, characterized in that that the full-emptying bunghole (8) is connected to the barrel casing (2) with its inner circumference on the casing side flush or with a step (12) corresponding to a maximum of the wall thickness (d) of the barrel casing (2).