EP0515390B1 - Drum with bung - Google Patents

Abstract

The invention concerns a drum, made of plastics material, with a bung and with a carrying and transport ring (30) at the upper end. Located near the edge of the upper end (12), in a sunken bunghole housing (18), is a bunghole nozzle (16). To ensure that the drum empties completely when it is held upside down inclined at a slight angle to the vertical, a circular inclined plane (10) is incorporated in the upper end (12) of the drum on both sides of the bunghole nozzle (16), the plane being flush with the lower-lying plane of the base (20) of the bunghole housing (18).

Description

The invention relates to a bung drum made of thermoplastic material with a circumferential support and transport ring arranged in the vicinity of the top floor on the barrel wall and with at least one bung hole nozzle arranged in the edge region of the top floor, which is recessed in a bunghole housing such that the end face of the bunghole nozzle is flush with or closes slightly below the outer surface of the top floor.

Such plastic barrels with at least one gripping ring arranged on the upper peripheral region of the barrel casing for a barrel gripper and optionally additional rolling rings on the barrel circumference are generally known. Plastic sheet drums can be made using different methods. In one manufacturing possibility, the barrel is formed in one piece with barrel bottoms and carrying and transport rings in the blow molding process, the carrying and transport rings still being compressed in the blow mold by means of displaceable mold slides (e.g. DE-A-29 14 938). According to another process variant, the cylindrical barrel body and the barrel bottoms with carrying and transport rings or rolling rings are prefabricated separately as individual parts and then welded or glued to one another (e.g. US-A-3,394,747). It is also already known to only prefabricate the carrying and transport rings as separate individual parts and then to weld or glue them onto the blow-molded barrel body. In another known plastic sheet bung, the top plate with the carrying and transport ring is screwed to the barrel wall as a detachable single part (e.g. US-A-4,094,432). The plastic barrel could also be designed as a wide-necked container with a detachable bunghole cover and clamping ring closure.

All known plastic drums with an upper carrying and transport ring, however, have the disadvantage in common that problems with the residual emptying of such drums arise due to the sinking of the bunghole connector or bunghole housing in the top of the barrel surrender. Even with manual swiveling of the barrel in an inclined overhead position, only an unsatisfactory residual emptying can be achieved, even if the barrel is held in such a way that the bunghole remains at the lowest possible point.

From EP-A-0 287 966 a further plastic bung is known, in which the emptying bung neck is arranged close to the container wall in order to achieve the most complete possible barrel emptying in the usual inclined position. It is considered a disadvantage here that the bunghole spigot is little protected against lateral forces acting on the barrel from the outside, even when arranged in a trough-shaped bunghole spigot housing.

In order to increase the elasticity of the barrel around the bunghole neck area, a deformation zone - which is formed between the neck part and the barrel wall in conventional barrels with a bunghole neck objected to by the barrel wall - on the side facing the tank interior between the neck part and the oblique boundary of the lower and slightly enlarged nozzle housing is provided as a fold formed from the outside. As a result of the threshold formed in the interior of the barrel, during the last phase of residual emptying, the contents still in the region of the trough-shaped recess (bunghole connector housing) can be better collected and with proper movement (swiveling during the entire emptying process with all inclined positions of the barrel) from the interior of the barrel or are transported out through the bunghole.

It is an object of the present invention to provide a structural design of a plastic sheet drum or the top floor (lid), which enables the greatest possible residual emptying in a static inclined position (without swiveling back and forth).

This object is achieved in a plastic barrel of the type mentioned in that the top bottom in addition to or next to the bunghole housing in has a substantially circular section-shaped surface part or a flat bevel, which is symmetrical on both sides of the bunghole neck and - viewed in the normal position of the barrel - is drawn in obliquely obliquely inwards into the barrel body, with the bevel being its deepest point on the side of the barrel Has barrel casing in the vicinity of the bunghole connector and opens there into the lower level of the bunghole housing base or into the bunghole connector. Since the top floor is not uniformly flat, but has the bevel essential to the invention in the area of the bunghole, runs with the residual emptying or an overhead positioning in a slightly inclined but resting inclined position of the barrel of z. B. 10 ° to 12 °, the residual liquid on the inside of the flat on the barrel wall to the bunghole housing and through the bunghole from the barrel.

In a preferred embodiment of the invention it is provided that the bevel forms a flat crease edge with the remaining barrel top, the mean distance from the center of the barrel being approximately equal to or less than a quarter of the barrel diameter, the depression of the bunghole housing on the side facing the barrel center at the crease edge or starts close to it, but has a larger articulation angle to the top floor than the bevel of the top floor circular section in the area of the bunghole connector. It is essential that the largest possible area of the original, flat top floor area remains, since a bevel of the top surface that is too large reduces the contact surface in the case of a stack stacking and would thus deteriorate the stacking properties of the drum.

In an embodiment of the invention it is provided for a bung with a bunghole cover that seals at the bottom of the bunghole that the depression / kinking of the bunghole housing on the side facing the center of the barrel is between 30 ° and 45 °, preferably about 40 °, and the bevel of the top section of the circle has a kink angle between 10 ° and 17 °, preferably about 13 °. The residual emptying takes place with this bung barrel with extended bung hole by simply tilting and holding it by a tilt angle of 18 ° to approx. 20 ° in the inclined barrel position of the overhead position. In another embodiment of the invention it is provided for a bung barrel with a bung lid sealing on the top of the bunghole nozzle that the bevel of the top floor circular section is flatter or has a flat articulation angle between 4 ° and 10 °, preferably about 6 ° , and that a recess or a breakthrough is formed in the top-sealing bunghole on the side facing the barrel jacket for the discharge of the residual liquid. With this drum, the residual emptying is carried out by tilting and holding at a smaller tilt angle of approx. 10 ° to 12 ° in a slightly inclined drum position of the overhead position.

The barrel according to the invention is suitable due to its structural design of the top floor or a corresponding barrel lid, to empty itself completely without manual swinging back and forth, provided that it is ensured, e.g. by means of a simple corresponding holding device that the barrel remains in the intended inclined position, the bung hole being to be made at the lowest point.

The invention is explained and described in more detail below with reference to exemplary embodiments shown in the drawings.

Figur 1

ausschnittsweise ein erfindungsgemäßes Faß im Bereich des Spundloches,

Figur 2

das in Fig. 1 dargestellte Faß in gekippter Restentleerungsposition,

Figur 3

ein zweites abgewandeltes Ausführungsbeispiel eines erfindungsgemäßen Kunststoff-Fasses,

Figur 4

eine Draufsicht auf das erfindungsgemäße Faß gemäß Figur 3,

Figur 5

eine Ansicht von innen auf den Faßoberboden in Restentleerungsposition,

Figur 6

ein weiteres Ausführungsbeispiel eines Kunststoff-Fasses mit oben abdichtendem Spundlochstutzen.

Figur 6a

eine Teilansicht des unteren Spundlochstutzens aus Fig. 6,

Figur 7

ein viertes Ausführungsbeispiel eines Kunststoff-Fasses mit oben abdichtendem Spundlochstutzen und

Figur 7a Figur 7b

eine Teilansicht bzw. Teilschnittdarstellung des unteren Spundlochstutzens aus Fig. 7.

Show it:

Figure 1

sections of a barrel according to the invention in the area of the bunghole,

Figure 2

1 in the tilted residual emptying position,

Figure 3

a second modified embodiment of a plastic barrel according to the invention,

Figure 4

3 shows a top view of the barrel according to the invention according to FIG. 3,

Figure 5

a view from the inside of the barrel top in the emptying position,

Figure 6

a further embodiment of a plastic barrel with a top-sealing bunghole.

Figure 6a

6 shows a partial view of the lower bunghole connector from FIG. 6,

Figure 7

a fourth embodiment of a plastic barrel with top-sealing bunghole and

Figure 7a Figure 7b

FIG. 7 shows a partial view or partial sectional view of the lower bunghole connector from FIG. 7.

Figure 1 shows a stackable bung of thermoplastic material for extensive residual emptying, which was produced by the blow molding process with a one-piece grip ring. The barrel has a cylindrical barrel jacket 22 with barrel gripping ring 30 arranged in the upper circumferential region for the use of a barrel gripper and a flat barrel top 12. Here, the upper edge of the barrel gripping ring 30 is exceeded by about three times the barrel wall thickness of the surface of the barrel top. A bung hole 14 is provided in the barrel top 12 in the vicinity of the barrel jacket 22. The bunghole 14 is enclosed by a bunghole connector 16, which is sunk into a bunghole housing 18 such that the end face of the bunghole connector 16 is almost flush with the outer surface of the barrel top 12 or is sunk slightly deeper. The bung hole is sealed below the thread at the oblique diameter constriction.

A circular section-shaped surface part or a substantially flat or flat bevel 10 of the top floor 12 is drawn in symmetrically towards the bunghole connector 16 or towards the outer edge of the barrel, sloping inwards into the barrel body, the bevel 10 being its deepest point on the side of the barrel jacket 22 and there flush in the lower level of the bunghole housing floor 20 opens.

Reference number 24 denotes a (here) straight folding edge between the barrel top 12 and the bevel 10. The depression of the bung-type housing 18 is shifted a little beyond the bent edge 24 towards the center of the barrel. This bung-type housing wall is recessed at an angle 38 between 30 ° and 45 °, preferably about 40 °, relative to the top of the barrel 12, while the bevel 10 beginning at the kink edge 24 is an angle 36 between 10 ° and 17 °, preferably about 13 °, is kinked relative to the barrel top 12. The bevel 10 borders at its lowest point at the level of the root area of the carrying and transport ring 30 or its connection point with the barrel jacket 22 on the inside of the barrel jacket.

The residual emptying position of the bung is shown in FIG. 2 . For this purpose, the barrel is tilted in the overhead position by an angle of approximately 18 ° to 20 ° and is preferably held stationary in this tilt position by means of a corresponding tilting device. Due to the angle difference between the flattening and the tilting angle, the liquid filling material can flow out completely completely by itself via the flattening 10 to the barrel wall 22 and from there through the bung housing or the bung hole connector 16.

A somewhat modified embodiment is shown in FIG . Here, the depression of the bunghole housing 18 begins on the side facing the middle of the barrel exactly at the kink edge 24, but the depression has a greater kink angle to the barrel top 12 than the bevel 10 of the barrel top bottom circular section in the area of the bunghole connector 16. Furthermore, between the barrel wall 22 and Bunghole connector 16 in the bunghole housing base 20 a rib-like elevation 34 is provided with a corresponding groove-like depression 32 on the inside. This ensures that even the last product in the tilted barrel position can run out of the depression between the bevel 10 and the inner barrel wall 22. Another difference is also that the upper edge of the gripping ring 30 is flush with or the same height as the surface of the barrel top is trained.

FIG. 4 shows a top view of the relevant part of the barrel top 12. From this it can be seen that the bevel 10 forms with the remaining barrel top 12 the flat folded edge 24, the distance 26 from the barrel center 28 is approximately equal to or less than a quarter of the barrel diameter. The depression of the bunghole housing 18 begins at the kink edge 24. The bevel 10 opens on the bunghole side into the flat bottom 20 of the bunghole housing 18. The comparatively small rib-like elevation 34 extends between the inner barrel wall 22 and the bunghole connector 16.

The flow diagram of residual liquid drops in the flowable filling material is illustrated in FIG. 5 . Thereafter, liquid residues run from the inner surface of the upper floor 12 essentially at right angles over the kink edge 24 to the inner curved barrel wall 22 and along this to the depression in the area of the bunghole housing bottom 20. From this collection point, the last liquid residue runs through the short, slightly recessed, radially extending one Channel 32 in the bunghole 16 or from the barrel.

A further modification for promoting the flow rate of the last liquid residues is - as indicated in FIG. 3 by the lowest sloping line of the bevel 10 - that the two halves of the bevel 10 (relative to the overhead position) are slightly inclined towards each other towards the bunghole , ie enclose an overall internal angle of approx. 175 ° between them at the bunghole connector (center line through the bunghole 14 and the barrel center 28).

FIG. 6 shows another blow-molded plastic drum with another bunghole connector 44. In this bunghole spigot 44, the screwed bunghole cover (not shown) seals the barrel via a corresponding seal against the upper edge or flange edge of the bunghole neck - in contrast to the barrel shown in FIG. 1, in which the bunghole cover with a seal in the lower, something fed Seals bunghole 16 seals. As a result, in this embodiment, a recess 46 can be formed on the side of the inner or lower bunghole spigot 44 facing the barrel wall 22, through which the residual liquid running together can run out of the barrel in the residual emptying or inclined overhead position of the barrel. Through this additional measure of the recess 46 in the lower bunghole edge - as can also be seen in the partial illustration in FIG. 6a , it is sufficient if the bevel 40 of the upper floor circular section has a flat articulation angle 42 or a flatter inclination between 4 ° and 10 °, preferably about 6 °, and at its deepest point at about half the height of the long vertical web of the carrying and transport ring 30 opens into the obliquely conical edge area of the barrel top 12, with the bunghole connector 44 (48) on the side facing the barrel jacket 22 a recess 46 or an opening 50 is provided for the discharge of the residual liquid.

FIG. 7 shows a barrel cover design with a cylindrical bung hole connector 48 which is produced by injection molding. The barrel top is designed in the same way as in the barrel shown in FIG. 6, only the bunghole connector 48 is inserted deeper into the bunghole housing 18 or protrudes a bit into the interior of the barrel, since this bunghole connector on the upper edge of the ( screwed bunghole cover is not sealed. So that the last remaining residual liquid can flow out unhindered here, this bung hole connector 48 has a corresponding opening 50 on the side facing the barrel wall 22. The opening 50 in the bunghole connector is shown again in FIG. 7a in cross-sectional view and in FIG. 7b in side view for clarification.

This configuration of the top of the barrel, which is produced by injection molding and welded with a blow-molded barrel jacket to the bottom of the barrel, can also be realized in the blow molding process for a completely one-piece plastic barrel in that only the bunghole connector is prefabricated as a separate injection-molded part and at the appropriate place is welded into the bunghole case bottom.

In the embodiments according to FIGS. 6 and 7, in which the bung plug is designed with an overhead seal, the short drainage channel 32 (see FIG. 5) could run out of the barrel edge into the bung hole higher in the bung housing, whereby an automatic complete residual emptying is nevertheless achieved becomes.

Figur 8

ein weiteres Ausführungsbeispiel eines erfindungsgemäßen Faß-(Deckel)-Oberbodens,

Figur 9

ein anderes erfindungsgemäßes Ausführungsbeispiel in perspektivischer Teilansicht und

Figur 10

ein letztes erfindungsgemäßes Ausführungsbeispiel in perspektivischer Gesamtansicht.

For a better illustration of the barrel top design according to the invention furthermore show:

Figure 8

another embodiment of a barrel (lid) top according to the invention,

Figure 9

another embodiment of the invention in partial perspective view and

Figure 10

a last embodiment of the invention in a perspective overall view.

In the top view of the bung top according to FIG. 8 , the crease edge between the barrel top and the bevel does not run completely straight, but the two halves of the bevel run somewhat obliquely to one another at the crease edge. At the same time, the two surface halves of the bevel can be slightly inclined to each other, with a slope to the bung hole in an overhead position to promote the leakage of residual liquid.

It is noteworthy here that the smaller of the two bungs serves as an outlet bung and is arranged within the bevel.

In this or another embodiment or with a combination of several of the features according to the invention, however, a conventional standard lid can also be designed, which is attached to the upper opening of a wide-neck drum (open top drum) by means of a clamping ring closure.

In the partial perspective view according to FIG. 9 , the crease edge of the bevel is crescent-shaped or arcuate, wherein the two surface halves of the bevel may not be flat, but may also be curved outwards.

The tail light is shown in FIG. 10 in a perspective overall view of a barrel version according to the invention, which is particularly suitable for a manufacturing process using the tandem blow molding technique.
Two barrel bodies with sub-floors are simultaneously blown in a blow mold, cut apart in the middle and an upper floor, prefabricated by injection molding, with an outer handling ring is welded onto the barrel body on each preliminary product.

All combinations of the features shown are within the scope of the invention. Thus, the crease edge 24 between the bevel 10 and the remaining barrel top 12 can also be designed in the shape of a circular arc with a large radius or in a crescent shape, with enlargement or reduction of the bevel 10 in the outer edge regions. The measures according to the invention are equally suitable for a one-piece blow-molded sheet drum with an upset drum gripping ring or for a drum welded or glued together from prefabricated individual parts (drum top with gripping ring, drum bottom and cylindrical wall). The barrel can also be designed as a lid barrel (wide-necked container) with a lid made of plastic or sheet steel, wherein the lid has the features according to the invention.

In the case of long-term stacking of plastic drums, it can happen that the top floor of the stacked drum sinks slightly downwards - into the drum interior - due to the stacking load. In conventional plastic drums with an outwardly convex top bottom, the possibility of residual emptying deteriorates as a result, while this phenomenon does not reduce the possibility of residual emptying in the plastic drum according to the invention, but rather promotes it.

Claims (7)

1. A barrel, having a bung, and made of thermoplastic material, with a carrying and transport ring (30) arranged surrounding the barrel wall (22) in the vicinity of the upper end (12), and with at least one bung hole socket (16) arranged in the edge region of the upper end (12), the socket being sunk in a bunghole socket housing (18) in such a manner that the end surface of the bunghole socket (16) is flush with the external surface of the upper end (12), or lies slightly therebelow, characterised in that the upper end (12), additionally to or apart from the bunghole socket housing (18), has a planar part, shaped substantially as a portion of a circle, or has a sloping part (10) which is symmetrically formed on both sides of the bunghole socket (16) and, when seen in the standard position of the barrel, is recessed so as extend, slightly sloping, at an angle inwards into the body of the barrel, the lowest point of the sloping part (10) being on the side of the barrel casing (22) in the vicinity of the bunghole socket (16) and opening there into the lower-lying plane of the floor of the bunghole socket housing (20), or into the bunghole socket (16).
2. A barrel in accordance with claim 1, characterised in that the sloping part (10) forms a slight inclination edge (24) with the remainder of the upper end (12) of the barrel, the average distance (26) of the edge from the central point (28) of the barrel being substantially the same as, or less than, a quarter of the barrel diameter.
3. A barrel in accordance with claim 2, characterised in that the sinking of the bunghole housing (18) begins at the inclination edge (24) on the side facing the middle of the barrel, but has a larger inclination angle (38) in relation to the upper end (12) than the sloping part (10) of the circular portion at the upper end in the region of the bunghole socket (16).
4. A barrel in accordance with claim 1, 2 or 3, characterised in that the sinking/angling of the bunghole housing (18) on the side facing the centre of the barrel is between 30° and 45°, and preferably approximately 40°, and the sloping part (10) of the circular portion at the upper end has an inclination angle (36) of between 10° and 17°, preferably approximately 13°, and at its lowest point borders the barrel casing (22) on the interior, at the height of the base region of the carrying and transport ring (30) or the region of connection thereof with the barrel casing (22).
5. A barrel in accordance with claim 1, 2 or 3, characterised in that for barrels with a bunghole socket (44, 48) with an upper seal, the sloping part (40) of the circular portion at the upper end has a slight inclination angle (42) or a flatter inclination of between 4° and 10°, preferably approximately 6°, and at its lowest point opens into the obliquely conically recessed edge region of the upper end (12) of the barrel at approximately half the height of the long vertical web of the carrying and transport ring (30), a recess (46) or a passage (50) being provided in the bunghole socket (44, 48) on the side facing the barrel casing (22), for the discharge of residual liquid.
6. A barrel in accordance with claim 2, 3, 4 or 5, characterised in that the inclination edge (24) between the level upper end (12) of the barrel and the sloping part (10, 40) is slightly curved in a sickle-shape, or is formed so as to extend at a slight angle to the bung socket for outflow (16).
7. A barrel in accordance with one of the preceding claims 1 to 6, characterised in that the two halves of the sloping part (10, 40) seen in an overhead position, are at a slight angle to one another, extending downwards from the bunghole socket (16), i.e. they form an internal angle between themselves of approximately 175°.

Images