EP4166487A1 - End plug for rotatably supporting a film roll - Google Patents

Abstract

The pin (2) for the rotatable mounting of a film roll (7) in a dispenser housing (1) comprises a connecting section for fastening to a core sleeve (13) of the film roll (7) and a bearing section which has at least two coaxially arranged cylindrical areas with different outside diameters ( D1, D2). These can be used to rotatably mount the film roll (7) in bearing bodies (3) with differently designed recesses (5).

Description

The subject matter of the invention is a pin for the rotatable mounting of a film roll or a flat structure wound onto a core sleeve in a dispenser housing.

Cling film, aluminum foil, and parchment paper are examples of sheets that are commonly wound onto a core, which core typically includes a core sleeve. Such rolls of film are stored in dispenser housings, which generally include a removal opening for pulling out an end section of the wound film and means for separating such end sections from the film supply wound onto the core.

In this document, the terms "foil" and "foil roll" are used synonymously for any fabric or roll of fabric, unless otherwise noted.

Foil rolls for household purposes are widely stored in folding boxes which include, for example, a jagged tear-off edge as a separating means. The folding boxes serve as a storage container and as a dispenser housing at the same time. The folding boxes are disposable containers that are disposed of as soon as the film supply has been completely used up.

Foil rolls for commercial purposes, for example for use in canteen kitchens, are comparatively large. They comprise foil strips wound onto a core sleeve, the length of which can be, for example, of the order of around 100 m to around 600 m, and the width of which is typically in the range of around 30 cm to 60 cm and is in particular 45 cm or 30 cm. Such film rolls are preferably stored at the place of use in stable, refillable dispenser housings.

From the EP3453659A1 a foil dispenser is known which comprises a metal housing and is designed to accommodate two different foil rolls in a space-saving manner. The foil rolls each comprise a core sleeve with different diameters and a foil strip wound onto it. In each roll of film, the core sleeve protrudes axially on both sides of the coiled film strip. The end sections of the core sleeve are rotatably mounted on roller holders in the housing. The roller holders are bearing plates which protrude upwards on the housing floor and have recesses which are open towards the upper end face and are designed to receive one end section of the respective core sleeve. With such foil dispensers, only foil rolls can be rotatably mounted in the roll holders, the dimensions of which, in particular the lengths, outer diameter and inner diameter of the core sleeves, are exactly on the respective Role holders are matched. The possible uses of film rolls are also limited. They can only be used in film dispensers whose roll holders are designed and arranged in such a way that such film rolls can be rotatably mounted therein.

It is therefore an object of the present invention to create a device that enables a film roll, which includes a film strip wound onto a core sleeve, to be rotatably mounted in at least two differently designed film dispensers.

This object is achieved by a pin for rotatably mounting a roll of film according to the features of patent claim 1.

The pin is an adapter that, as a link, enables a film roll to be rotatably mounted in dispenser housings with different roll holders. For the rotatable mounting of the film roll on roll holders in the dispenser housing, a pin is attached to each end of the core sleeve of this film roll. Because of their function, such journals are also referred to as bearing journals or adapter journals. Each pin preferably comprises a wall which radially delimits an internal cavity. Such pins can be made with comparatively little material and are correspondingly light.

The spigot comprises a connecting section which can be connected to a film roll, for example by being pressed into one of the open end sections of the core sleeve of a film roll. Axially adjacent to the connecting section, the spigot comprises a bearing section with at least two cylindrical areas that have a different outside diameter. The outer diameter of the axially inner cylindrical section or closer to the connection area can, for example, be smaller than that of the axially outer cylindrical section. The larger outside diameter can in particular correspond to the outside diameter of the core sleeve onto which the film strip is wound. Foil rolls in which such spigots are attached to the ends of the core tube can be used, for example, in foil dispensers whose roll holders are designed for directly supporting protruding end portions of the core tube.

The cylindrical area with the smaller outside diameter that is closer to the connecting section can be used for rotatably mounting the film roll on bearing bodies that comprise comparatively narrow recesses for receiving bearing elements that protrude axially on the film roll.

In combination with such pins, it is not necessary, but possible that the core sleeves of film rolls protrude axially beyond the coiled film strip, for example about 5mm on each side of the film strip. The length of a core sleeve can, for example, be approximately the same size as the width of the foil strip. Such film rolls can be produced efficiently and easily stored and transported with little space requirement.

For example, spigots can be attached to the ends of the respective core sleeve during production of the film rolls or at a later point in time. In particular, they can be sold separately as accessories or together with foil rolls or foil dispensers.

Connecting portions of spigots may be designed for use with one or more different types of film rolls. For film rolls with different inside and/or outside diameters of the core sleeve, for example, different pins with correspondingly adapted dimensions in the area of the connecting section can be used. Such pins are preferably designed in one piece, so that they can be produced inexpensively in large numbers.

Alternatively, pegs in the connecting section can include, for example, expandable elements or interchangeable adapter rings with different outside diameters, which enable adaptation to core sleeves with different inside diameters.

Figur 1

einen Querschnitt eines mit zwei Folienrollen bestückten Folienspenders gemäss Stand der Technik,

Figur 2

einen aufgeschnittenen weiteren Folienspender, in dem eine Folienrolle mit einem alternativen Lagersystem drehbar gelagert ist,

Figur 3

einen Endabschnitt einer Folienrolle und einen Zapfen in einer Explosionsdarstellung,

Figur 4

einen Längsschnitt im Endbereich einer Folienrolle mit einem daran befestigten Zapfen,

Figur 5

den aufgeschnittenen Zapfen aus Figur 4 in einer vergrösserten Darstellung,

Figur 5a

ein weiterer aufgeschnittener Zapfen mit Verstärkungsrippen,

Figur 6

eine Anordnung analog zu jener in Figur 2, jedoch mit einem Zapfen gemäss Figur 3,

Figur 7

einen Längsschnitt eines Folienspenders im Bereich eines Lagerkörpers, an dem eine Folienrolle mit einem Zapfen gemäss Figur 3 gelagert ist,

Figur 8

die Anordnung analog zu jener aus Figur 7, wobei die Folienrolle jedoch an einem alternativen Lagerkörper gelagert ist.

The invention is described in more detail below with reference to some figures. show it

figure 1

a cross section of a film dispenser equipped with two film rolls according to the prior art,

figure 2

a further film dispenser cut open, in which a film roll is rotatably mounted with an alternative storage system,

figure 3

an end section of a film roll and a pin in an exploded view,

figure 4

a longitudinal section in the end area of a film roll with a pin attached to it,

figure 5

the cut cone out figure 4 in an enlarged view,

Figure 5a

another cut tenon with reinforcing ribs,

figure 6

an arrangement analogous to that in figure 2 , but with a pin according to figure 3 ,

figure 7

according to a longitudinal section of a film dispenser in the region of a bearing body on which a roll of film with a pin figure 3 is stored

figure 8

the arrangement analogous to that figure 7 , However, the film roll is mounted on an alternative bearing body.

figure 1 shows a cross section of a known film dispenser, which comprises a dispenser housing 1 with two axially spaced roll holders, the roll holders each comprising a bearing body 3 with recesses 5 in which two film rolls 7 are rotatably mounted parallel to one another. The dispenser housing 1 includes a hinged cover 9, which can be opened to insert or remove rolls 7 of film. In order to pull out foil sections, the dispenser housing 1 comprises a removal opening 11 for each of the foil rolls 7 , which are arranged opposite the pivot axis 9a of the hinged lid 9 .

The recesses 5 or the delimiting legs of the plate-shaped bearing body 3 are essentially U-shaped. In the case of the recess 5 at the front in the pull-out direction A for film sections, the adjoining legs of the bearing body 3 are inclined backwards with respect to the vertical direction, and the base of the recess 5 comprises two essentially straight sections arranged in a V-shape. Both film rolls 7 comprise a core sleeve 13 which protrudes axially on both sides beyond the film strip wound thereon. These axially outstanding areas of the Core sleeves 13 are rotatably mounted in the recesses 5 of the bearing body 3 .

figure 2 shows a perspective view of an open dispenser housing 1 with other roll holders on which a roll of film is mounted by means of bearing pins. The front face is not shown for a better view of the dispenser housing 1 . The roll holders are arranged axially spaced apart from one another in the longitudinal direction of the dispenser housing 1 near the two end faces of the dispenser housing 1 . They include bearing bodies 3 in the form of L-shaped curved plates, the shanks of which face each other and are connected to the bottom of the housing. In alternative embodiments, the shanks could also be attached to the bottom of the housing with the opposite orientation. In further alternative embodiments, bearing bodies 3 could be connected, for example, to the rear wall of the dispenser housing (not shown). The bearing bodies 3 each comprise a recess 5 with an insertion area 15 open towards the upper end face, a bearing area 17 arranged at the lowest level of the recess 5 and a lateral bulge 19 adjoining it.

A pin 2 is arranged at each of the two ends of the core sleeve 13 and is connected to this core sleeve 13 in a rotationally fixed manner. The pin 2 includes an axially outstanding cylindrical section whose outer diameter D1 is smaller than the clear dimension of the recess 5. The outer diameter D1 can be, for example, in the order of about 10mm to about 25mm and can be, for example, about 20mm, and the length of the axially protruding section is preferably in the order of about 5mm to about 12mm and can be about 9mm, for example. After this section has been inserted through the insertion area 15, the pin 2 is deflected towards the bearing area 17 by an insertion ramp 21 and then rests as in FIG figure 2 shown at the lowest level of the recess 5. The insertion ramp 21 is an inner edge section of the recess 5 which is arranged between the insertion area 15 and the storage area 17 and which has a gradient or an incline towards the storage area 17.

figure 3 shows an axial end portion of a film roll 7 and a pin 2 according to the present invention as an exploded view. In contrast to the in figure 2 illustrated pin 2 includes the pin 2 in figure 3 coaxially adjacent to the area with the small outer diameter D1 another cylindrical area with a larger outer diameter D2. These two areas together form a bearing portion of the spigot 2 which protrudes from the film roll 7 when the spigot 2 is attached to the core sleeve 13 thereof. For this purpose the spigot 2 comprises an open end portion the connecting section which can be inserted into the core sleeve 13 and whose outer diameter corresponds approximately to the inner diameter of the core sleeve 13 . It can be, for example, in the range from about 38 mm to about 42 mm and in particular can be about 40 mm. The connecting section can include structures such as protruding ribs 29 for force-fitting connection to the core sleeve 13 . The ribs 29 can be arranged axially and/or radially, as a result of which particularly non-rotatable and/or pull-out-proof connections can be achieved. The connecting section can optionally be slightly conical. This facilitates the insertion and pressing into the respective core sleeve 13 .

The length L1 of the connecting section in the axial direction can be, for example, in the range from about 12 mm to about 20 mm, preferably between 14 mm and 15 mm. This is sufficient for a secure connection of the spigot 2 to the core sleeve 13, the total length L of the spigot 2 and its weight or the amount of material required to produce the spigot being comparatively small. In further embodiments, the connecting sections can also be longer. Between the connecting section and the bearing section, the pin 2 preferably comprises a stop flange 31, the outside diameter of which is larger than the inside diameter of the core sleeve 13 and preferably smaller than the outside diameter D3 of the core sleeve 13. The Stop flange 31 protrudes radially beyond the connecting flange.

For example, the thickness L4 of the stop flange 31 may range from about 1mm to about 3mm. When the connecting section is pressed in, the stop flange 31 defines the end position of the pin 2 when it hits the core sleeve 13.

The length L2 of the cylindrical section with the smaller outer diameter D1 is preferably in the order of about 5 mm to about 12 mm and can be about 9 mm, for example.

The length L3 of the cylindrical section with the larger outside diameter D2 is preferably on the order of about 8 mm to about 18 mm and can be about 13 mm, for example. The larger outer diameter D2 is preferably in the range from approximately 30 mm to approximately 60 mm and can in particular be 48 mm. This is a common value for the outside diameter of core sleeves. figure 4 shows a longitudinal section of the film roll 7 from figure 3 in the end region of the core sleeve 13, the spigot 2 being connected to this core sleeve 13 by pressing the connecting section into the open end of the core sleeve 13.

figure 5 shows an enlarged longitudinal section of the Figures 3 and 4 shown pin 2. The axially outer cylindrical portion with the larger outer diameter D2 includes a continuous bottom 4, the coaxial adjacent cylindrical area with the smaller outer diameter D1 partially or completely covered. This improves the stability of the pin 2. Alternatively or additionally, the pin 2 can include inwardly protruding ribs 33 to improve stability ( Figure 5a ). In further embodiments of the spigot 2, the base 4 can include one or more bores or openings 35 in the central area, so that the spigot 2 or its wall delimits an axially continuous interior space, which can in particular be tubular. This has the advantage that when the pins 2 are pressed into the core sleeve 13, no excess pressure can arise that would cause a counteracting force to the pressing-in force.

Figure 5a shows an embodiment of the pin 2 with a continuous central opening 35 and with radially inwardly protruding ribs 33 to increase the stability of the pin 2. Such ribs 33 preferably extend as in FIG Figure 5a shown axially over the entire length of the spigot 2. Spigot 2 without a continuous central opening 35 can also comprise such reinforcing ribs.

In a particularly advantageous embodiment, the larger outside diameter D2 of the bearing section corresponds to the outside diameter D3 of the core sleeve 13. This enables a film roll 7 equipped with such pins 2 to be rotatably mounted in dispenser housings 1, formed with roller holders for rotatably supporting axially protruding portions of the core sleeve 13.

figure 6 shows analogous to figure 2 an arrangement with a roll of film 7 mounted in the dispenser housing 1. In contrast, the pins 2 correspond to the embodiment according to FIG figure 3 . In each bearing body 3, the area of the journal 2 with the larger outer diameter D2 is arranged axially on the outside of the bearing body 3. As a result, the film roll 7 is additionally secured against axial displacement.

The axially outer areas of the pins 2 with the larger outside diameters D2 are tubular. They can therefore be used as gripping openings for easy insertion and removal of film rolls 7 in the dispenser housing 1 .

figure 7 shows a longitudinal section of a foil dispenser in the area of one of the bearing bodies 3, with a foil roll 7 having a pin 2 according to FIG figure 4 is rotatably mounted on this bearing body 3. The outer cylindrical section of the pin 2 with the larger outside diameter D2 lies in a correspondingly large recess 5 of the bearing body 3.

figure 8 shows a similar arrangement as figure 7 with the same film roll 7 and the same pin 2. In contrast to the arrangement in figure 7 lies the inner one cylindrical section of the pin 2 with the smaller outer diameter D1 in a narrower recess 5 of the bearing body 3, as is shown in figure 6 is shown. The pin 2 is preferably made of one or more plastic injection molded parts.

In alternative embodiments, the connecting section of the pin 2 could also be designed differently. For example, it could be longer and/or in two parts. In particular, it could comprise a base for attaching different adapter parts optimized for connection with different core sleeves 13 (not shown).

Claims (10)

Pin (2) for the rotatable mounting of a film roll (7) in a dispenser housing (1), comprising a connecting section which can be connected to an end section of a core sleeve (13) of the film roll (7) and a bearing section which has a first cylindrical region with an outside diameter (D1 ) and can be used for rotatable mounting in a recess (5) of a bearing body (3) when the pin (2) is connected to the core sleeve (13), characterized in that the pin (2) is coaxial with the first cylindrical area at least comprises a further cylindrical area with an outside diameter (D2) which is larger than the outside diameter (D1) of the first cylindrical area, so that the pin (2) can be used for rotatable mounting in a larger recess (5) of another bearing body (3). . Spigot (2), characterized in that the connecting section is cylindrical and has an outside diameter in the range of 38mm to 42mm, which corresponds to the inside diameter of the core sleeve (13). Pin (2) according to Claim 2, characterized in that the connecting section comprises protruding ribs (29) for non-positive connection with the core sleeve (13). Spigot (2) according to one of Claims 1 to 3, characterized in that the outside diameter (D1) of the first cylindrical area is in the range from 10 mm to 25 mm. Spigot (2) according to one of Claims 1 to 4, characterized in that the outside diameter (D2) of the further cylindrical area is in the range from 30 mm to 60 mm. Spigot (2) according to one of Claims 1 to 5, characterized in that the cylindrical area with the larger outside diameter (D2) comprises a radially accessible gripping opening. Pin (2) according to one of Claims 1 to 6, characterized in that a stop flange (31) is arranged between the connecting section and the bearing section, the outer diameter of which is dimensioned such that it projects radially beyond the connecting section. Pin (2) according to one of Claims 1 to 7, characterized in that it comprises inwardly protruding ribs (33) and/or a base (4) between the coaxially adjoining cylindrical areas to improve stability, this base (4) partially or completely covers the cylindrical area with the smaller outside diameter (D1). Pin (2) according to any one of Claims 1 to 8, characterized in that it comprises a wall delimiting an axially continuous inner space. Spigot (2) according to one of Claims 1 to 9, characterized in that it is made from plastic as a one-piece injection-moulded part.

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