EP0332185B1 - Moulded end walls for cores of rolled material - Google Patents

Abstract

An end wall comprises a central wall body and outer wall parts which surround and enclose the central wall part. The central wall body is of circular design and has a central insertion peg which is provided with V-shaped ridges on its peripheral surface. The outer wall parts have an inward-curving quadrant-shaped abutment surface which has the same radius as the central wall body. On the rear side of the composite plate, junctions are provided along the abutment surfaces of the outer wall parts and of the central wall body, into which junctions connecting pieces are driven. The junctions and the connecting pieces in each case have the outline of double swallowtail. At its front side, each outer wall part is provided with a locking boss which continues a rounded corner surface and has the same radius as this corner surface. The side walls of the plates are either of smooth design or provided with stacking bosses and stacking pockets.

Description

The invention relates to an end wall made of moldable material for a winding roll, with a rectangular, in particular square, rounded corner surfaces plate, the front of the winding roll facing a smooth, flat surface and the back of the winding roll stiffened outwards by radial and annular ribs is, with a central hollow cylindrical insertion pin and locking cams that protrude perpendicularly from the front of the plate.

Such a front wall made of plastic or another mouldable material for packaging winding material wound on winding rolls, for example plastic films, forms, together with a second corresponding front wall, a dimensionally stable overall packaging of a winding roll.

The usual packaging is generally constructed in such a way that additional parts for central fixing of the winding roll are inserted into a box made of wood or corrugated cardboard. These additional lines include wooden boards with attached hubs, perforated disks made of plywood, hardboard, gray cardboard with inserted centering bushes made of sheet metal or plastic, or partially ribbed molded parts made of plastic with molded mounting pins from one piece.

The disadvantage of this known packaging is that it consists of several individual parts, which are also not non-positively connected, so that the overall packaging has only little stability in the case of heavy winding rolls.

The known end wall described at the outset has the disadvantage that, although it can be stacked on top of one another with horizontally oriented end walls, which allows space-saving storage of the end walls, the vertically oriented end walls with their side walls are not stacked side by side or one above the other and with one another can be engaged or mutually locked. This means that, by means of the end walls, packaged winding rolls cannot easily be stacked on top of one another, since the stability of such a stacking cannot be guaranteed. If large-format, one-piece end walls with dimensions from 600x600 mm are manufactured, the tool costs for injection molding machines increase disproportionately compared to small-format end walls.

From the German utility model 19 91 976 a one-piece end wall made of plastic is known, which consists of a square, preferably square, stiffened with radial webs flat plate. In the middle there is an insertion pin for the roll of winding material, which is equipped with holding prisms, for example. The plate is wrapped in a belt small prism-shaped strips are arranged on the outside. At the corners of the plate, the belt includes four cup-shaped depressions which protrude into the free cavity between the material to be wound and the packaging jacket and which are open near the outer end face and has a circumferential stop bar which is provided with teeth.

From DE-A 21 66 558 a multi-part plastic pallet for bottle crates is known, which has a frame made of elongated outer supports and an insert connected to the frame. The individually prefabricated outer beams are connected to each other, and a belt of each outer beam is designed as a profile bar with an upper and a lower flange, which are connected to one another by a web. The insert consists of an upper and a lower flange.

From DE-U 85 20 270 an end wall for a winding roll is known, which consists of a flat plate with a mandrel protruding perpendicularly from the plane on one side in the surface center. This end wall has circumferential edge webs directed at right angles to its plate plane and ribs running between them within the surface as stiffening elements. The edge webs are provided on their outer surfaces with an alternating profile consisting of teeth and tooth gaps of the same length, width and height. There are two groups of such profiles lying side by side in the transverse direction of the edge webs. The end wall is made in one piece from plastic as an injection molding.

The object of the invention is to produce large-format end walls from dimensions of 600 x 600 mm at low cost and to be able to produce an extensive range of sizes of end walls with injection molding tools for smaller formats.

The mutual locking of the end walls of a plurality of complete rolls stacked on top of one another and / or next to one another, which are closed off from the end walls, is also to be ensured, the end walls being able to interlock with each of their side walls without a specific preselection of the alignment of the side walls with respect to one another got to.

This object is achieved in that the end wall consists of a circular central wall body and a plurality of outer wall parts which rest on the peripheral surface of the central wall body and are inextricably connected to it by connecting pieces.

In an embodiment of the invention, the central wall body is completely enclosed by a total of four outer wall parts.

The insertion pin of the central wall body is expediently connected via a shoulder to a central cylindrical through opening on the rear side of the plate, and the diameter of the through opening is larger than the outer diameter of the insertion pin. In this case, V-shaped webs run on the outer surface of the insertion pin parallel to the longitudinal axis of the insertion pin and have a V cross section that becomes smaller towards the front of the plate.

In a further development of the invention, each outer wall part has a rounded corner surface and a cylindrical locking cam which is integrated with the corner surface and has the same radius as the rounded corner surface, the corner surface lies diagonally opposite a projecting, quarter-circular abutting surface which adjoins the central wall body and has the same radius like the central wall body, and from the two corner edges of the quarter-circular abutting surface, there is a flat abutting surface that abuts the adjacent outer wall part, the two flat abutting surfaces being perpendicular to one another and each abutting surface forming a right angle with an adjacent side wall of the outer wall part.

The further embodiment of the invention results from the features of claims 6 to 16.

The multi-part end wall according to the invention is used above all for end wall sizes from 600x600 mm. The advantage of the multi-part end wall is that a central wall body, which acts as a basic body, can be assembled with four outer wall parts in different sizes and thus this combination option can save considerable costs for injection molding tools.

The cost of manufacturing the individual parts and the assembly of these individual parts to form the finished end wall is far less than the cost of producing the end wall from one piece, since the low unit weights of the individual parts mean that small and inexpensive injection molding machines can be used and that on the Tool costs to be moved around end walls are considerably lower than the costs for tools which make it possible to manufacture a front wall of the same dimension in one piece.

An extensive range of sizes of end walls can thus be manufactured cheaper in relation to the tool costs of the injection molding machines, since in addition to the smaller tools there is also the advantage that a central wall body of the same size can be combined with differently sized outer wall parts, only for each further size of the outer wall parts an injection mold must be made again.

Fig. 1

schematisch eine auf eine Aufwickelhülse aufgewickelte Wickelrolle, die von Stirnwänden nach der Erfindung begrenzt ist,

Fig. 2

eine perspektische Ansicht der Vorderseite einer Ausführungsform der Stirnwand nach der Erfindung,

Fig. 3

eine perspektivische Ansicht der Rückseite der Stirnwand nach Fig. 2,

Fig. 4

eine perspektivische Ansicht der Vorderseite einer weiteren Ausführungsform der Stirnwand nach der Erfindung,

Figur 5

eine vergrößerte Teilansicht in Draufsicht der Rückseite einer Verbindungsstelle zweier angrenzender Einzelteile der Stirnwand,

Figur 6

eine perspektivische Ansicht eines Verbindungsstücks der Stirnwand
und

Figur 7

eine Schnittansicht einer Verbindungsstelle zweier Einzelteile der Stirnwand.

The invention is explained in more detail below with reference to exemplary embodiments illustrated in the drawings. Show it:

Fig. 1

schematically a wound on a winding tube winding roll, which is limited by end walls according to the invention,

Fig. 2

2 shows a perspective view of the front of an embodiment of the end wall according to the invention,

Fig. 3

3 shows a perspective view of the rear of the end wall according to FIG. 2,

Fig. 4

2 shows a perspective view of the front of a further embodiment of the end wall according to the invention,

Figure 5

2 shows an enlarged partial view in plan view of the rear side of a connection point between two adjacent individual parts of the end wall,

Figure 6

a perspective view of a connector of the end wall
and

Figure 7

a sectional view of a junction of two individual parts of the end wall.

In Figure 1, a complete winding roll 32 is shown schematically, which is wound on a winding tube 33. The end faces of the winding roll 32 are delimited by end walls 1 of a first embodiment, each of which has a central insertion pin 4 which is inserted into the winding tube 33. The end wall 1 consists of a composite rectangular, in particular square plate 40, at the four corners of which locking cams 6 are arranged which merge into cam lugs 16. The four side walls 39 of the composite plate 40 of the end wall 1 are smooth.

As can be seen from the perspective view of the front of the end wall 1 in FIG. 2, the assembled plate 40 consists of a central wall body 2 and a plurality of outer wall parts 3 which abut the peripheral surface of the central wall body 2. The central wall body 3 is circular and is bordered along its circumferential surface by the four outer wall parts 3. As will be described in more detail with reference to FIG. 3, the central wall body 2 and the four outer wall parts 3 are permanently connected to one another by connecting pieces 7. The central wall body 2 carries the centrally arranged hollow cylindrical insertion pin 4, which is connected via a shoulder 34 to a central cylindrical through opening 13 (see FIG. 3) on the rear side of the plate 40. The diameter of the through opening 13 is larger than the outer diameter of the insertion pin 4. Each outer wall part 3 has a rounded corner surface 12, with which a cylindrical locking cam 6 is integrated, which has the same radius as the rounded corner surface 12. The corner surface 12 is diagonally opposite a projecting, quarter-circular abutting surface 20, which adjoins the central wall body 2. This protruding abutting surface 20 has the same radius as the central wall body 2. A flat abutting surface 19 extends from the two corner edges of the quarter-circular abutting surface 20, which abuts the adjacent outer wall part. The two flat abutting surfaces 19 run at right angles to one another, and each of the two abutting surfaces 19 encloses a right angle with an adjacent side wall 39 of the outer wall part 3. In other words, this means that an outer wall part 3 is delimited by a rounded corner surface 12, two side walls 39, two abutting surfaces 19 and a projecting, four-part circular abutting surface 20.

The cylindrical cam lugs 16 are offset from the locking cams 6 by a shoulder.

The smooth or flat front side of the plate 40, which faces the winding roller, protects the front side of the winding roller against damage, particularly during transport.

On the outer surface of the insertion pin 4 run parallel to the longitudinal axis of the insertion pin V-shaped webs 5, which are smaller towards the front of the plate 40 will have a V cross-section. The insertion pin 4 is pressed into the bore of the winding tube (see FIG. 1). The V-shaped webs 5 on the insertion pin 4 ensure a better hold of the insertion pin in the winding sleeve 33 and the same dimensional tolerances of the winding sleeve on the one hand and the insertion pin on the other. The diameter of the hollow cylindrical insertion pin 4 is adapted to the diameter of the respective bore of the winding tube 33.

The perspective view in Figure 3 of the rear of the end wall 1, which is facing away from the winding roll and points outwards, shows that the individual parts of the end wall 1 are equipped with radial ribs 9, ring ribs 10 and longitudinal and transverse ribs 11, which are the rear side stiffen and avoid large wall thicknesses, so that the piece weight of the end wall 1 can be kept low. These ribs result in a high load capacity of the end wall 1 with a low weight.

On the back of the composite plate 40 there are recesses 14 distributed over the circumferential surface of the central wall body, which have, for example, the shape of a dovetail. Each outer wall part 3 has a recess 15 on the rear side along the projecting, quarter-circular butting surface 20 and the two butting surfaces 19, which is also dovetail-shaped. The opposite recesses 14 and 15 of the central wall body 2 or the outer wall parts 3 complement each other to form a double dovetail. The same applies to the opposite cutouts 15 on the abutting surfaces 19 of two adjacent outer wall parts 3, which also have the shape of a double dovetail. In these double dovetail-shaped recesses of the adjacent outer wall parts 3 and the respective outer wall part 3, which bears against the central wall body 2, the connecting pieces 7 are hammered, the more detailed configuration of which will be described. These connectors 7 snap into the recesses and result in an inseparable connection between the central wall body and the respective outer wall parts or between adjacent outer wall parts, the abutting surfaces of these individual parts can also be coated with an adhesive in order to additionally strengthen the mechanical connection by gluing .

A perspective view of the front of a further embodiment of the end wall 1 according to the invention is shown in FIG. This end wall 1 differs from the embodiment according to FIG. 2 in that the side walls 39 are not smooth, but rather are equipped with stacking cams 21 and 22. As can be seen from FIG. 4, the stacking cams 21 and 22 limit stacking pockets 23, 24, which are designed to be complementary to the stacking cams. The stacking cams 21 are shorter than the stacking cams 22. The basic body of the two groups of stacking cams 21, 22 is in each case cuboid, one side surface 25 or 26 of the stacking cam 21 or 22 being chamfered and inclined towards the side wall 39. One stacking cam 21 is arranged near the corner surface 12 and the abutting surface 19 of the side wall 39, the one stacking cam 21 being formed rotated by 180 ° with respect to the other stacking cam 21. The two other stacking cams 22 of a side wall 39 are also rotated through 180 ° to one another and offset diagonally to one another, as will be described in more detail below. One stack cam 21 and 22 is aligned, for example, with the lower edge of the side wall 39, while the stack cams 22 and 21 rotated by 180 ° are aligned with the upper edge of the side wall 39.

The group of longer stacking cams 22 also has inclined surfaces 27, 28 in addition to the beveled side surface 26. The stack cams 22, 22, which are rotated relative to one another by 180 °, are arranged such that the diagonally opposite inclined surfaces 27, 28 overlap. One end face of the stacking cams 22 is tapered in a wedge shape by the inclined surfaces 27, 28, while the end face 30 of the respective stacking cam 22 opposite these inclined surfaces 27, 28 extends perpendicular to the side wall 39. The group of the shorter stacking cams 21 has two end faces 29 perpendicular to the side wall 39 for each stacking cam. The end faces 29, 30 of the stacking cams 21 and 22, which are at a distance from one another, each form the boundary walls for a guide groove 41 which receives a strapping band 31 (indicated schematically in FIG. 4) of the winding roll 32.

There are several guide grooves 41 on all four side walls 39, which are for example 20 mm wide and about 10 mm deep.

The two end walls 1 of a winding roll are firmly connected to the winding roll by strapping with strapping strips 31 made of plastic or metal. The exact distance of the guide grooves 41 from one another is chosen so that the strapping can be attached by a tandem strapping system. If necessary, the end wall edges can be reinforced at the strapping points and the guide grooves can be given the appropriate strength by an opposite end wall rib.

The radial ribs 9, the annular ribs 10 and the longitudinal and transverse ribs 11 of the rear side of the plate 40 are at the same height as the outer edges or the edges of the side walls 39 of the plate 40. In the exemplary embodiment described, each outer wall part 3 is for each side wall 39 two stacking cams 21 and two stacking cams 22 are provided. This number of stacking cams is sufficient, for example, for dimensions of 600 × 600 mm of the end wall 1, but it is obvious that with larger dimensions of the end wall, correspondingly more stacking cams 21 and 22 per side wall 39 of the individual outer wall part must be present. The number of guide grooves 42 will then also be greater than four.

If two end walls 1 are stacked horizontally one above the other, the cam lugs 16 of the locking cams 6 of one end wall engage in the recesses 17 on the rear side of the plate 40 of the end wall above. Likewise, the insertion pin 4 engages in the through opening 13, which results in the possibility of stacking and palletizing the end walls in a space-saving manner. The recesses 17 are enclosed by round webs 18 and the corner surfaces 12 and connect to the hollow cylindrical locking cams 6 on the back.

The end walls 1 can be stacked side by side as well as one above the other. Since the stacking pockets 23, 24, as mentioned above, are designed to be complementary to the stacking cams 21, 22, the stacking cams 21, 22 and the stacking pockets 23, 24 can be stacked or stacked side by side and / or stacked vertically one above the other of the vertically aligned end walls 1 a side wall 39 of an end wall can be joined seamlessly with the complementary stacking pockets 23, 24 and the complementary stacking cams 21, 22 of each of the four side walls 39 of the further end walls 1.

The stacking cams or stacking pockets interlock so that moving along or across the side wall 39 is not possible. The bevelled side surfaces of the stacking cams and the stacking pockets allow the winding rolls packed with these end walls to be stacked and destacked without any problems. Mutual locking of the complete winding rolls stacked on one another or next to one another and packed by the end walls is achieved.

The end walls are made, for example, from thermoplastic materials by injection molding. Regenerates and recycling materials can be used. The stacking cams, like the webs and ribs, are molded in the same injection molding process.

Since all four side walls 39 of an end wall are of the same design with respect to the stacking cams and stacking pockets, it is possible to stack and / or stack the winding rolls closed off with the end walls at any time since each side wall of the one end wall can be brought into engagement with each side wall of a further end wall without a preferred alignment of the end walls to each other is necessary. In other words, this means that the stacking cams and stacking pockets engage or snap into one another in any position of the end walls, whether aligned vertically or horizontally. It is also an advantage that the single, vertically aligned end wall can easily run on roller conveyors with one Roller distance of 60 to 80 mm can be transported, since the stacking cams 21 and 22 of the individual side wall 39 lie with their cover surfaces in the same plane and are further apart from each other by a maximum of 20 mm.

The enlarged detailed view in plan view of the rear of a connection point between the central wall body 2 and an outer wall part 3 shows in FIG. 5 a recess 14 in the abutting surface 20 of the central wall body 2. This recess 14 has the shape of a dovetail. A recess 15 in the abutting surface 20 of the outer wall part 3 adjoins this recess 14. This recess 15 also has the shape of a dovetail, so that the adjacent recesses 14 and 15 have the outline of a double dovetail. In the longitudinal walls of the two cutouts 14 and 15 there are openings 35, into which cams 8 of the connecting piece 7 snap. The connector 7 is reinforced by inner webs 36, 37 between its peripheral walls.

As can be seen from the perspective view of the connecting piece 7 according to FIG. 6, there is a slot 38 on each of the two sides of the tabs which carry the cams 8. These slots 38 make it possible for the connecting piece 7 to be driven into the recesses 14 and 15 spring back the cams 8 into the interior of the connecting piece 7 for so long until they have reached the openings 35, into which they then snap, as has already been mentioned.

Fig. 7 shows in detail a sectional view of a connection point along the abutting surfaces of two adjacent outer wall parts. The cams 8 of the connecting piece 7 are locked in the openings 35. The connecting piece 7, which has the shape of a double dovetail, is open on one side and has an E-like cross section.

Of course, the connector 7 can also have a different shape than that of a double dovetail. It is then only necessary that the cutouts 14 and 15 in the individual parts of the composite plate 40 are designed to be complementary to the outer contour of the connecting piece 7.

Claims (16)

1. An end wall (1) of moldable material for a wound roll, having a rectangular, in particular square, plate (40) which has rounded corner surfaces and the front side of which, said front side facing the wound roll (32), forms a smooth, flat surface and the rear side of which, said rear side facing outwards away from the wound roll, is stiffened by radial and annular ribs (9, 10), and further having a central, hollow-cylindrical insertion peg (4) and locking bosses (21, 22) projecting perpendicularly from the front side of the plate, wherein the end wall (1) is composed of circular central wall body (2) and a plurality of outer wall parts (3) which rest against the circumferential surface of the central wall body (2) and are connected to the latter non-releasably by connecting pieces (7).
2. The end wall as claimed in claim 1, wherein the central wall body (2) is completely enclosed by four outer wall parts (3).
3. The end wall as claimed in claim 2, wherein the insertion peg (4) of the central wall body (2) is connected via a shoulder (34) to a central cylindrical through-opening (13) on the rear side of the plate (40), and wherein the diameter of the through-opening (13) is greater than the outside diameter of the insertion peg (4).
4. The end wall as claimed in claim 3, wherein V-shaped ridges (5) extend parallel to the longitudinal axis of the insertion peg (4) on the outer surface of the insertion peg (4), said ridges having a V-shaped cross-section which becomes smaller towards the front side of the plate (40).
5. The end wall as claimed in claim 2, wherein each outer wall part (3) has a rounded corner surface (12) and a cylindrical locking boss (6) which is integrated with the corner surface and has the same radius as the rounded corner surface (12), wherein an inward-curving, quadrant-shaped abutment surface (20) which adjoins the central wall body lies diagonally opposite the corner surface (12) and has the same radius as the central wall body (2) and wherein in each case one flat abutment surface (19), which rests against the adjoining outer wall part, starts from the two corner edges of the quadrant-shaped abutment surface (20), the two flat abutment surfaces extending at right angles to one another and each abutment surface enclosing a right angle with an adjoining side wall (39) of the outer wall part (3).
6. The end wall as claimed in claim 2, wherein the connecting pieces (7) are reinforced by internal webs (36, 37) between the circumferential walls, and wherein, at the longitudinal outer sides of the circumferential walls of the connecting pieces (7), bosses (8) are arranged on tabs which are bounded on each side by a slot (38), allowing the tabs to execute a spring action with respect to the circumferential walls.
7. The end wall as claimed in claim 6, wherein, on the rear side, recesses (14), of which each is provided with openings (35) in its longitudinal wall for the snapping-in of the bosses (8) of a connecting piece (7), are distributed over the circumferential surface of the central wall body (2).
8. The end wall as claimed in claim 5, wherein, on the rear side, along the inward-curving, quadrant-shaped abutment surface (20) and the two abutment surfaces (19), each outer wall part (3) has a recess (15) which contains openings (35) in its longitudinal wall for the snapping-in of the bosses (8) of a connecting piece (7).
9. The end wall as claimed in claims 7 and 8, wherein the recesses (14; 15) in the circumferential surface of the central wall body (2) and in the abutment surfaces (19, 20) are swallowtail-shaped, and wherein the mutually opposite, equal-sized recesses (15, 15; and 15, 14) in the abutment surfaces (19) of the outer wall parts (3) and of the quadrant-shaped abutment surface (20) and of the circumferential surface of the central wall body (2) form the outline of a double swallowtail.
10. The end wall as claimed in claim 6, wherein the connecting pieces (7) have a double swallowtail-shaped outline.
11. The end wall as claimed in claim 1, wherein stacking bosses (21, 22) which delimit stacking pockets (23, 24) are present on the two outer side walls (39) of each outer wall part (3) of the end wall (1), and wherein the stacking pockets (23, 24) are of complementary design to the stacking bosses.
12. The end wall as claimed in claim 11, wherein the stacking bosses (21, 22) have different lengths and bevelled side faces (25, 26) which are inclined towards the side wall (29), and wherein pairs of stacking bosses (21, 22) lie flush with the upper and the lower edge of the side wall (39).
13. The end wall as claimed in claim 12, wherein the stacking bosses (21, 22) have further oblique surfaces (27, 28), wherein one short stacking boss (21) is in each case arranged near to the corner surface (12) and to the abutment surface (19) on the side wall (39) of the outer wall part (3), the two stacking bosses (21) being rotated by 180° with respect to one another and lying flush with the upper and lower edge respectively of the side wall (39), and wherein the two longer stacking bosses (22) are rotated by 180° with respect to one another and offset with respect to one another, their diagonally opposing oblique surfaces (27, 28) overlapping.
14. The end wall as claimed in claim 13, wherein the mutually opposing, spaced end faces (29, 30) of the stacking bosses (21, 22), said end faces extending perpendicularly on the side wall (39), form a guide groove (41) for a strap (31) of the wound roll (32).
15. The end wall as claimed in claim 5, wherein the locking boss (6) of each outer wall part (3) has a cylindrical boss neck (16) which is set off by a shoulder and is of smaller diameter than the locking boss (6).
16. The end wall as claimed in claim 15, wherein the locking boss (6) is hollow and cylindrical and, on the rear side of the outer wall part (3), merges into a recess (17) which is surrounded by the rounded corner surface (12) and a round web (18).

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