EP1086021A2

EP1086021A2 - Barrel with plastic lid

Info

Publication number: EP1086021A2
Application number: EP99939772A
Authority: EP
Inventors: Dietmar Przytulla
Original assignee: Mauser Werke GmbH
Current assignee: Mauser Werke GmbH
Priority date: 1998-05-28
Filing date: 1999-05-26
Publication date: 2001-03-28
Anticipated expiration: 2019-05-26
Also published as: CA2333473A1; EP1086021B1; JP4199928B2; ES2226419T3; WO1999061323A3; WO1999061323A2; AU4266699A; BR9911604A; DE19980934D2; ATE273177T1; BR9911604B1; DE59910215D1; CA2333473C; US6401957B1; JP2002516234A

Abstract

A lidded plastic barrel (10) consisting of a barrel body (12), a barrel lid (14) and a clamping ring or ferrule (16). The U-channeled rim (20) of the barrel lid (14) includes an additional, rotationally symmetrical sealing web (36) and a gasket (22) is positioned between the outer circular side wall (26) of the lid and the said sealing web (36). Between the sealing web (36) and the inner circular side wall (28) of the lid an annular recess (38) opens up toward the bottom while the sealing web (36) and the inner circular side wall (28) are spaced apart and are mutually connected by way of an upper flange (40).

Description

Plastic lid barrel

The present invention relates to a plastic lid barrel with barrel body and barrel lid placed thereon with a seal and clamping ring closure inserted therein according to the preamble of claim 1. Such a lid barrel is known, for example, from US Pat. No. 5,427,264.

State of the art: In the case of a plastic lid barrel of the previous design, the seal of the barrel lid is held by the vertical lid outer web and by the vertical lid inner ring (cf. FIG. 2). In the case of drop tests (= barrel crashes) or internal pressure tests, the central cover disk bulges upwards and, as a result, the vertical cover inner ring deforms inwards and outwards from its vertical position, which relieves the seal, loses its sealing seat against the edge of the barrel opening and leakage can occur in extreme areas. Task:

It is an object of the present invention to provide a generic cover drum which, by means of a reinforced connection of the drum cover to the drum opening edge, has improved sealing properties, particularly in the case of high internal pressure or drum crash (surge pressure).

Solution: In the lid barrel according to the invention, the barrel lid has a further rotationally symmetrical sealing web within the U-shaped lid edge, the seal being arranged between the outer annular lid web and the sealing web, while between the sealing web and the inner annular lid web there is an annular one which is open at the bottom Free space is formed, the sealing web and the inner cover web being spaced apart and connected to one another only via an upper connection. As a result of this advantageous measure, the seal on the barrel cover, which noticeably improves the disadvantage of the prior art, does not relieve the seal, even if the vertical cover inner ring is deformed inwards and upwards, by the sealing web which remains vertical. Rather, the seal is basically held axially and radially better by the vertical web adjoining the seal and, even in the event of extreme stresses on the cover barrel, securely seals the rim of the mouth of the barrel against the barrel lid due to reduced deformations in the sealing area. Another solution variant provides that on the underside of the lid, the inner annular cover web of the cover edge is then arranged, a circumferential and - viewed in cross-sectional direction - self-contained reinforcing element which is hollow or foamed on the inside. The hollow or foamed reinforcing element can be formed by gas injection technology while the heated plastic is pressed into the injection mold. In another way, the reinforcing element can also be made hollow on the inside, but closed, by welding a prefabricated, separate annular plastic part. By arranging the torsionally rigid reinforcing element in the outer region of the barrel lid, which dips into the barrel opening and is supported on the inside thereof, it is correspondingly prevented that the lid seal is relieved to a permissible extent when the lid is deformed and loses its sealing effect The invention provides that the upper edge of the barrel opening on the inside in addition to the circumferential sealing strip and slightly spaced therefrom has a vertically upstanding profile ring which, when the barrel cover is in place, engages in the annular space between the sealing web and the inner annular cover web in the closed state. As a result, there is no longer any risk of the additional vertical sealing web being deformed inwards or upwards, even if the inner ring of the lid is deformed greatly, since the additional vertical sealing web of the barrel lid is gripped and held by the additional vertical profile ring at the top of the barrel body. When the barrel lid is closed and closed with a clamping ring, the upstanding profile ring and the sealing web pointing downwards overlap by at least 5 mm. The upstanding profile ring can only be segment-wise, that is to say interrupted or in the form of a circumferential profile ring, in which case it is preferably provided with at least one bore running through its root region for the discharge of any liquid therein.

In a preferred embodiment, a further circumferential cover seal is used in the free space between the sealing web and the inner annular cover web, which additionally seals the connection of the barrel opening edge / barrel lid edge in the closed state of the barrel cover against the upper edge of the raised peripheral profile ring. This achieves an even better sealing effect under extreme stress.

The lid barrel according to the invention is further characterized by the following essential features and advantages: the additional vertical profile ring on the barrel body is partially interrupted in order to be able to drain the groove formed by it; the additional vertical profile ring on the barrel body is longer for a better hold of the additional vertical cover web; the additional vertical profile ring on the barrel body, in conjunction with a seal in the barrel lid, additionally seals the area of the barrel lid / barrel border; the connection of the inner cover plate on the inside of the U-shaped cover edge is formed at the level of the lower edge of the outer cover web or below; the connection of the inner cover plate on the inside of the U-shaped cover edge takes place via an upwardly open, essentially U-shaped engaging groove with a flat groove bottom, the height of the inner cover plate or at least the central region of the cover plate being approximately flush with the level of the upper one Lid edge or protruding above it is formed.

The invention is illustrated below with reference to the drawings

Embodiments explained and described in more detail. Show it :

FIG. 1 shows a perspective illustration of a lid barrel according to the invention (Vanguard FRH barrel II),

FIG. 2 shows a partial sectional view of the connection area between the barrel lid edge and the barrel body mouth of a known lid barrel,

FIG. 3 shows the barrel lid edge of a simple barrel lid according to the invention in an enlarged partial sectional view,

FIG. 4 shows an enlarged barrel section edge of another barrel lid edge with barrel body mouth and clamping ring,

Figure 5 to further embodiments of the barrel lid edge with barrel body mouth

Figure 11 and clamping ring,

FIG. 12a shows a schematic drum with deformation at the time of the ground impact (coat drop test),

Figure 12b is a partial sectional view in the impact axis I - 1 of the connection area barrel lid edge / barrel body mouth acc. 12a,

Figure 13a is a schematic drum with deformation at the time of the ground impact (coat drop test) and

Figure 13b is a partial sectional view about 45 ° ll-ll to the impact axis of the connection area barrel lid edge / barrel body mouth acc. 13a

In Figure 1, the reference numeral 10 denotes a lid barrel, which comprises a barrel body 12, a barrel lid 14 and a clamping ring 16. The barrel lid 14 is made of high molecular weight thermoplastic (HDPE) and is manufactured by injection molding. The barrel body 12 is also made of high molecular weight thermoplastic (HDPE) and is made by injection molding, but preferably by blow molding. The clamping ring 16 is made of sheet steel or plastic. The lid edge and the barrel body edge are equipped with the special features of the invention.

Figure 2 illustrates the deformation effect of increased internal pressure, particularly on the barrel lid 14 of a previously known lid barrel design. In this lid barrel, the barrel body 12 has a circumferential sealing strip 24 on the upper, solidly compressed and thickened barrel opening edge 18, and the barrel lid 14 is equipped with a U-shaped lid rim 20 which is open at the bottom. The lid rim 20 is provided with an outer annular lid web 26 and an inner annular lid web 28, a seal 22 being inserted (foamed or inserted) between the two lid webs 26, 28. The clamping ring closure 16 has a substantially trapezoidal, inwardly open cross-section and, in the closed state, overlaps the U-shaped lid edge 20 from above with its upper leg 30 and engages under with its lower leg 32 a substantially radially outwardly projecting jacket flange 34 in Close area of the upper rim 18 of the barrel opening. In the closed state of the clamping ring 16, the cover seal 22 is pressed against the sealing strip 24 of the upper rim 18 of the barrel opening in order to develop its sealing effect. The action of internal pressure causes the central cover plate 42 of the drum cover 14 to bulge outward in the axial direction. As a result, the inner cover web 28 of the cover edge 20 - as indicated by the arrows drawn in - is drawn inwards and lifted off or pressed off at the top. The result of this is that the inside of the cover seal 22 is increasingly relieved, can deflect inwards, and loses its sealing effect. The situation is similar in the event of a barrel crash in the barrel lid areas with the greatest kinking effect of the barrel opening edge. This disadvantageous sealing behavior is eliminated in an embodiment according to the invention shown in FIG. In this case, an additional axially downward-pointing sealing web 36 is formed between the outer lid web 26 and the inner lid web 28 of the downwardly open U-shaped lid rim 20. The cover seal 22 is now arranged and fixed between the outer cover web 26 and the additional sealing web 36, the sealing web 36 being formed with a thin gap or with a small distance of about 2-4 mm from the inner cover web 28 and only over an upper, comparatively thin connection 40 with this is in an elastic flexural connection. At the bottom, the flat or outwardly curved inner cover plate 42 adjoins the lower edge of the inner cover web 28. The connection of the inner cover plate 42 on the inside of the U-shaped cover edge 20 can be in the amount of lower edge of the outer cover web 26, or - as shown in Fig. 4 - be formed lower below. On the underside of the cover plate 42, two axially downwardly extending inner ring members 64, 66 (cf. FIG. 5) or a self-contained hollow annular plastic part 56 can also be provided as reinforcing element 54.

Another embodiment example shows in FIG. 4 a drum cover 14 with the associated clamping ring 16 and the simple drum opening edge 18 of a drum body 12. The drum cover is equipped with an engaging groove 44 and a raised inner cover plate 42. The engaging groove 44 has a depth of at least 15 mm and a flat groove base 46 with a radial extension (width) of at least 10 mm for the engagement of the upper claw of a barrel gripper tool. Then, on the inside of the groove base 46, an essentially axial or obliquely conical ring piece 70 rises as a connecting element to the central cover disk 42, which has a reduced diameter. The height of the inner cover plate 42 or at least the bulged central region of the cover plate 42 can - as shown - be designed to be approximately flush in the height plane of the upper cover edge 20 or projecting above it (cf. FIG. 10).

A preferred exemplary embodiment with a reinforced barrel opening edge is shown in FIG. 5. The upper barrel opening edge 18 has on the inside in addition to the circumferential sealing strip 24 and at a distance from it a vertically upstanding profile ring 48 which, when the barrel cover is in place, engages in the annular space 38 between the sealing web 36 and the inner annular cover web 28 in the closed state. Here, a circumferential retaining groove 52 is formed between the upstanding profile ring 48 and the sealing web 36 on the inside at the upper barrel opening edge 18, into which the sealing web 36 of the barrel lid engages. In order to achieve sufficient mutual support, it is provided that the upstanding profile ring 48 and the sealing web 36 overlap by at least 5 mm when viewed in the axial direction in the closed state of the barrel cover 14 which is placed on and closed with the clamping ring 16. In this embodiment, the connection 40 of the inner cover web 28 on the upper cover edge 20 above the free space 38 is largely flexibly elastic z. B. with an indentation (in the manner of a hinge). The upstanding profile ring 48 is provided here as a circumferential profile ring 48 with at least one bore 50 running through the root area thereof, so that any liquid filling material that has got into the holding groove can flow back into the barrel body. In the modified exemplary embodiment shown in FIG. 6, the highly standing profile ring 48 only segmented, ie interrupted, so that no liquid filling material can accumulate in the holding groove 52. Here, the contact surface for the lower leg 32 of the clamping ring 18 has also been widened in that the jacket flange 34 is provided with a flange edge extension 62 which projects outwardly by at least 3 mm. The inner annular cover web 28 is extended beyond the connection point of the central cover plate 42 or the groove base 46 of the engaging groove 44 downward as an axial outer inner ring part 64. Furthermore, a second inner ring part 66 is formed on the underside of the drum cover at a radial distance of at least 10 mm from the axial outer inner ring part 64. In this case, as shown with the drum cover attached, the axial outer inner ring part 64 can protrude inward into the drum body by at least 5 mm longer than the second inner ring part 66. In an advantageous embodiment and for stiffening the outer rim of the barrel opening, the tension ring 16 has an extension apron 68 which adjoins its lower leg 32 and runs essentially in the axial direction and comes into contact with the outer barrel wall. Advantageously, this extension apron 68 engages in a recess in the outer barrel wall in such a way that an attached barrel gripper or its lower barrel gripper claw cannot get caught on the retracted lower edge of the extension apron, which runs flush with the outer barrel wall. In this illustration, the feature essential to the invention can also be seen that with a stack loading of the lid barrel in a stack, for. B. three such barrels in the closed state of the outer cover web 26 on the flange 62 and the sealing web 36 rests in the groove base of the retaining groove 52, viewed in the axial direction above the sealing strip 24, a gap of at least 2 mm remains for the cover seal 22, so that even at Overloading no permanent damage to the cover seal 22 can occur.

In the exemplary embodiment according to the invention shown in FIG. 7, a reinforcing element 54 which is closed in the circumferential direction and which adjoins the inner annular cover web 28 of the cover edge 20 and which is hollow in configuration is arranged on the underside of the cover. This hollow but very torsionally rigid reinforcing element 54 can be produced by using the gas injection technique known per se during the injection molding process.

The exemplary embodiment according to FIG. 8 shows a self-contained foamed reinforcing element 54. The foamed reinforcing element can be injected into the injection mold or by injecting a foaming agent. whose cavity is created for the reinforcing agent.

Finally, FIG. 9 shows an embodiment variant in which the reinforcing element 54 can be made hollow on the inside but welded on by welding a prefabricated, separate annular plastic part 56 (see also FIG. 3). In this embodiment, the sealing strip 24 is provided at the top with a small, upstanding cam strip 70, which is pressed into the cover seal 22 and additionally secures it against lateral sliding.

FIG. 10 shows an exemplary embodiment in which at least one side bung closure 60 is arranged as a 2-inch (approx. 50.8 mm) or 3-inch bung (approx. 76.2 mm) within the inner cover plate 42. In the same way, a central-center bung closure with a corresponding bung size could also be formed within the inner cover plate 42. The drum lids according to the invention have a comparatively large diameter of greater than 300 mm. With an essentially cylindrical lid barrel with a capacity of 35 US gallons (approx. 132.5 liters), the outer lid diameter is approx. 472 mm with a barrel height of approx. 860 mm, while with a lid barrel (see FIG. 1) with a capacity of 55 US gallons (approx. 208 liters) the outer lid diameter is approx. 576 mm with a drum height of approx. 898 mm. These barrels have a barrel opening that is approx. 15% larger than conventional bellied lid barrels. In the case of smaller, stiffer lids (smaller than 200 mm) or screw caps, the problem of such a bulging of the lid does not occur as seriously under internal pressure. In the lid shape shown, the two inner ring parts 64, 66 are each provided with at least one bore 72 in the root region thereof. As a result, when the lid barrel is completely filled with liquid contents, e.g. B. through the bung 60, the air behind the inner ring parts escape. Likewise, these bores 72 allow residual liquid located behind the inner webs 64, 66 to flow away in a slightly inclined overhead emptying position. In the preferred exemplary embodiment according to FIG. 11, a further second circumferential cover seal 58 is inserted in the free space 38 between the sealing web 36 and the inner annular cover web 28, which in the closed state of the barrel cover 14 against the upper edge of the upstanding circumferential profile ring 48 connects the barrel opening edge / The edge of the drum lid also seals. This double seal is particularly good for surge pressure z. B. suitable for a barrel crash.

In the barrel shown schematically in FIG. 12a with the greatest deformation at the time of the ground impact (= jacket fall), a section line II along the impact axis is indicated. The influence of the mutual stress of the barrel lid edge and the barrel body edge at this point is shown in the partial sectional view Figure 12b explains. Due to the impact energy, the lid 14 presses with its inner lid web 28 against the inner wall of the barrel opening edge 18 and the sealing web 36 laterally against the sealing strip 24 of the barrel opening edge. Although here the central cover plate 42 bulges outward to a great extent, there is no particular risk of the seal being relieved at this point if the cover barrel becomes leaky. Rather, this danger occurs in the barrel shown schematically in FIG. 13a with the greatest deformation at the time of the ground impact (= jacket fall) in the areas of the section line II-II about 45 ° to the impact axis. The reaction of the mutual stress of the edge of the drum lid and the edge of the drum body at this critical point is explained in the partial sectional view according to FIG. 13b. The barrel body 12 is not as stiff in the radial direction as the barrel cover 14. The barrel body 12 deforms very strongly, particularly in the region of the barrel opening edge 18, and additionally loads the connection of the barrel opening edge / barrel lid edge. The drum cover 14 cannot expand in the same way and is pulled very flat at this point, in particular in the area of the engaging groove 44 and connection of the central cover plate 42. So far there was a risk that the lid seal 22 was relieved from the inside and the barrel lid edge pulls out from under the clamping ring 16. This is no longer the case with the cover construction according to the invention, because the outer cover web 26 is held in a form-fitting manner laterally by the sealing strip 24 on the upper barrel opening edge 18 and the cover-side sealing web 36 laterally by the profile ring 48. The edge of the cover is thus held twice and the seat or the direct neighboring components around the cover seal 22 do not change their position relative to one another, so that the full sealing effect is advantageously retained undiminished.

It goes without saying that the special design features shown in the various exemplary embodiments can be combined with one another in a meaningful manner.

Related digit list

Lid barrel 50 hole (48)

Barrel body 52 holding groove (18)

Barrel cover 54 reinforcing element (42)

Tension ring 56 ring-shaped. Plastic part

Barrel opening edge (12) 58 second lid seal

Lid rim (14) 60 side bung lock

Gasket (20) 62 flange edge extension (34)

Sealing strip (20) 64 outer inner ring part outer cover web (20) 66 inner inner ring part inner cover web (20) 68 extension skirt (16) upper leg (16) 70 cam ledge (24) lower leg (16) 72 bore (64,66 )

Jacket flange (12) 74

Sealing web (20) 76

Free space (28, 36) 78

Connection (28, 36) 80 inner cover plate

Engaging groove

Groove base (44)

Profile ring (18)

Claims

claims

1.) Plastic lid barrel (10) with barrel body (12), barrel lid (14) and clamping ring closure (16), the barrel body (12) having a circumferential sealing strip (24) on the upper barrel opening edge (18), the barrel lid ( 14) has a downward-facing U-shaped lid edge (20) with an outer annular lid web (26) and an inner annular lid web (28), in which a seal (22) is inserted between both lid webs (26, 28) Clamping ring closure (16) has a substantially trapezoidal, inwardly open cross section and in the closed state with its upper leg (30) overlaps the U-shaped lid edge (20) from above and with its lower leg (32) an essentially horizontal or engages in the lower barrel body edge, which is formed slightly obliquely downwards, in the vicinity of the upper barrel opening, characterized in that the barrel lid (14) within the U-shaped lid rim (20) has another rota has a symmetrical circumferential sealing web (36), the seal (22) being arranged between the outer annular cover web (26) and the sealing web (36), while between the sealing web (36) and the inner annular cover web (28) an open downward an annular free space (38) is formed, the sealing web (36) and the inner cover web (28) being spaced apart and connected to one another only via an upper connection (40). (Fig. 3)

2.) Plastic lid barrel (10) with barrel body (12), barrel lid (14) and clamping ring closure (16), the barrel body (12) having a circumferential sealing strip (24) on the top barrel opening edge (18), the barrel lid ( 14) has a downward-facing U-shaped lid edge (20) with an outer annular lid web (26) and an inner annular lid web (28), in which a seal (22) is inserted between both lid webs (26, 28) Clamping ring closure (16) has a substantially trapezoidal, inwardly open cross-section and in the closed state with its upper one Leg (30) engages over the U-shaped lid edge (20) from above and engages with its lower leg (32) an essentially horizontally downward molded barrel body edge (34) in the vicinity of the upper barrel opening, characterized in that on the Lid underside, adjoining the inner annular lid web (28) of the lid edge (20), a circumferential and - viewed in cross-sectional direction - self-contained reinforcing element (54) is arranged, which is hollow or foamed on the inside. (Fig. 7, 8)

3.) Lid barrel according to claim 2, characterized in that the reinforcing element (54) by welding a prefabricated, separate annular plastic parts (56) is hollow on the inside, but closed. (Fig. 3, 9)

4.) Lid barrel according to claim 1, 2 or 3, characterized in that the connection of the inner cover plate (42) on the inside of the U-shaped lid edge (20) at the level of the lower edge of the outer cover web (26) or deeper below it is. (Fig. 3)

5.) Lid barrel according to claim 1, 2, 3 or 4, characterized in that the connection of the inner cover plate (42) on the inside of the U-shaped lid edge (20) via an upwardly open, substantially U-shaped engaging groove ( 44) with a flat or oblique groove base (46), the height of the inner cover plate (42) or at least the central region of the cover plate (42) being approximately flush in the height plane of the upper edge of the cover (20) or projecting above it. (Fig. 4)

6.) Lid barrel according to claim 1, 2, 3, 4 or 5, characterized in that the upper edge of the barrel opening (18) on the inside in addition to the circumferential sealing strip (24) and spaced therefrom has a vertically upstanding profile ring (48), which at attached barrel cover (14) in the closure stood in the annular space (38) between the sealing web (36) and the inner annular cover web (28). (Fig. 5)

7.) Lid barrel according to at least one of the preceding claims 1 to 6, characterized in that the upstanding profile ring (48) only in segments, d. H. is interrupted, or is provided as a circumferential profile ring (48) with at least one bore (50) running through its root area. (Fig. 6, 5)

8.) Lid barrel according to at least one of the preceding claims 1 to 7, characterized in that a circumferential retaining groove (52) is formed between the upstanding profile ring (48) and the sealing web (36) on the inside at the top barrel opening edge (18), in which the Sealing web (36) of the barrel cover (14) engages. (Fig. 5, 6)

9.) Lid barrel according to at least one of the preceding claims 1 to 8, characterized in that the upstanding profile ring (48) the sealing web (36) in the closed state of the fitted and with clamping ring (16) closed barrel lid (14) - viewed in the axial direction - around overlapped at least 5 mm. (Fig. 5)

10.) Lid barrel according to at least one of the preceding claims 1 to 9, characterized in that in the free space (38) between the sealing web (36) and the inner annular lid web (28) a further (second) circumferential lid seal (58) is used , which additionally seals the connection of the barrel opening edge / barrel lid edge in the closed state of the barrel cover (14) against the upper edge of the upstanding circumferential profile ring (48). (Fig. 11)

11.) Lid barrel according to at least one of the preceding claims 1 to 10, characterized in that the connection (40) of the inner lid web (28) on the upper lid edge (20) above the free space (38) largely flexibly elastically z. B. is formed with a recess (in the manner of a hinge). (Fig. 5)

12.) Lid barrel according to at least one of the preceding claims 1 to 11, characterized in that at least one side bung closure (60) is arranged within the inner cover plate (42). (Fig. 1, 10)

13.) Lid barrel according to at least one of the preceding claims 1 to 12, characterized in that a central bung closure is formed within the inner cover plate (42).

14.) Lid barrel according to at least one of the preceding claims 1 to 13, characterized in that the contact surface for the lower leg (32) of the clamping ring (18) is widened in that the jacket flange (34) has a substantially by at least 3 mm has projecting flange edge extension (62) on the outside. (Fig. 5)

15.) Lid barrel according to at least one of the preceding claims 1 to 14, characterized in that when stacked in the closed state, the outer cover web (26) on the flange edge extension (62) and the sealing web (36) rests in the groove base of the holding groove (52), wherein Viewed in the axial direction, a gap of at least 2 mm remains for the cover seal (22) above the sealing strip (24), so that the cover seal (22) is not overloaded when such drums are stacked. (Fig. 5)

16.) Lid barrel according to at least one of the preceding claims 1 to 15, characterized in that the inner annular cover web (28) extends beyond the connection point of the central cover plate (42) or the groove base (46) of the engaging groove (44) downwards is designed as an axial outer inner ring part (64). (Fig. 5)

17.) Lid barrel according to at least one of the preceding claims 1 to 16, characterized in that on the underside of the barrel lid (14) at a radial distance of at least 10 mm to the axial outer inner ring part (64), a second inner ring part (66 ) is trained. (Fig. 5)

18.) Lid barrel according to at least one of the preceding claims 1 to 17, characterized in that the axial outer inner ring part (64) by at least 5 mm longer (protruding inward into the barrel body when the barrel lid is in place) than the second inner ring part (66) is formed. (Fig. 5)

19.) Lid barrel according to at least one of the preceding claims 1 to 18, characterized in that the clamping ring (16) is an extension apron (68) which adjoins its lower leg (32) and runs essentially in the axial direction and comes to rest on the outer barrel wall ) having.