Patent Publication Number: US-9896297-B2

Title: Container-unroller with tear cut and electric cut, provided with a mechanism for the anti-rewrapping one-way extraction of film, aluminium sheet or similar wrapped around a roll

Description:
The present invention concerns a container-unroller with electric cut and tear cut, provided with a mechanism for the anti-rewrapping one-way extraction of film, aluminium sheet or similar around a roll. 
     Particularly, the invention refers to a container of said type, wherein it is possible to insert from time to time rolls of film for food use, paper for food use, i.e. so-called food grade oven paper, aluminium sheet and like and allowing unwrapping without rewrapping, said container being provided with means facilitating tear cut of said sheets or films wrapped around a roll and inserted in the container and further allowing, as desired, the film to be cut by contact with an heated element as a result of electric current flow as well (below through the current specification named electric cut). 
     Currently commercially available food grade oven paper, aluminium film or sheet rolls  1  are generally offered to buyers enclosed within containers with a box body made of paperboard or similar material. The cut of the sheet, or film, wrapped around the roll, occurs by means of the aid of a saw-toothed bar, fixed in cutting position, located on the container rib, therefore potentially dangerous when by chance touched. 
     This type of containers, moreover, generally is not provided with mechanism preventing reliably from undesired opening, resulting in the possibility of an easy opening, thus exposing the sheet or film therein to the contamination by outside agents and products. 
     Further since the roll disposed inside of the container is not fixed in any way to said container, when the container and the roll therein are put away, the roll, being free, at minimum motion drags inside of the container the edge of the sheet i.e. film remaining after previous extraction and tear. This occurrence, associated to the fact that food grade transparent films are generally self-adherent, result in the edge of previously unwrapped film sticking disorderly on its-self and the part of film remains wrapped around the roll, creating difficulty during the successive extraction step, during which it is often necessary the container to be opened manually trying to find the film edge, with a consequent loss of time and a possible contamination for food to be stored. 
     U.S. Pat. No. 5,630,563 describes a device for the release of a controlled amount of film or sheet  1  from a roll. The device comprises a cylindrical container, consisting of two hinged semi-cylinders, suitable to be opened for the insertion of the roll and subsequently moved closer for holding the same, the device being equipped with means to rotate the film or sheet roll  1  along only one way and means preventing the two semi-cylinders from closing completely, defining an opening for the sheet extraction and allowing the roll rotation, and suitable to be contrasted manually by an user, when a desired amount of film or sheet  1  has been extracted, in order to move closer the two semi-cylinders and consequently preventing the roll from further rotation. Further the device comprises means for the cut of the film or sheet  1 . The device does not involve any specific trigger in order to facilitate the cut of food grade films, more elastic and difficult to be cut than aluminium or paper sheets. 
     EP Application No. 154093 describes a container for accommodation of polymer film rolls, particularly for food use, having a port for film extraction and means for hot cut thereof, particularly a heatable filament connected to a power system. Said device does not involve means for the cut of paper or aluminium sheets not susceptible to be cut as result of filament induced heating 
     In this context the solution is disclosed according to the present invention, the object thereof being to provide for a container-unroller provided with electric and tear cut means, at the same time occurring in the container and being interchangeable, further equipped with means for the anti-rewrapping one-way extraction of the film, aluminium sheet or similar wrapped around the roll disposed inside thereof. 
     The object of the present invention is therefore to provide a container-unroller with electric and tear cut of film, aluminium sheet or similar wrapped around the roll allowing to overcome the limits of container-unrollers according to prior art and above described technical results to be obtained. 
     A further object of the invention is that said container-unroller can be produced at substantially reduced costs, both as to production and operating costs. 
     Not last object of the invention is to propose a container-unroller which is simple, safe and reliable. 
     It is therefore a specific object of the present invention a container-unroller for film, aluminium sheet or similar wrapped around a roll, comprising a tubular body, for the accommodation of a roll to be contained, means for control of one-way rotation of said roll, means for hot electric cut and means for tear cut. 
     Particularly, according to the invention, said means for hot electric cut and said means for tear cut can be placed on a same device, alternatively in the same position on said device, said means for hot electric cut and said means for tear cut consisting of a metallic saw-toothed bar, connected to means for generation of electric current, or in facing positions on said device, said means for hot electric cut and said means for tear cut consisting, respectively, of an extended wire, connected to tensioning means and electric current generation means and a saw-toothed bar. 
     Alternatively, according to the invention, said means for hot electric cut and said means for tear cut can consist of two interchangeable devices, and said container-unroller can comprise a track, positioned on the external surface of said tubular body, for the insertion, as desired, of one of said cutting devices. 
     Preferably, according to the invention, said means for control of one-way rotation of said film, aluminium sheet or similar roll comprises all the inside components of said tubular body, i.e. said closure stoppers, provided with hinges with grooved surface, universal holed stoppers applicable to said roll, respectively one toothed and one simple stopper for each side of said roll, a tooth spring washer on a side of said roll, provided with a hole with a groove correspondent to that of said hinges of closure stoppers, the whole being under a spring pressure. 
     Further according to the invention, said two closure stoppers have two edges, one inside of the other, apart from each other as the thickness of the said threaded tubular body, the external edge of said stoppers being inside threaded. 
     Still, again according to the invention, said holed universal stoppers have a cylindrical body, provided with a plurality of longitudinal cuts alternated along all the circumference, forming raised arched fins. 
     Preferably, according to the present invention, said interchangeable device for hot electric cut has a tubular shape and is provided with an extended steel wire, located on the rib of the device, an electric circuit fed by rechargeable batteries located inside of the instrument, and operated through a switch placed outside of the instrument, and a profile for matching with said tubular body of the container; and said interchangeable instrument for tear cut has a cylindrical shape and is provided with a saw-toothed bar, placed inside of a room, and a cylindrically shaped base, at the two ends being equipped with two hinges, inserted and freely rotating in corresponding holes of said room, allowing the saw-toothed bar to be moved between two positions, namely cutting and resting position, driven by means of a tab located nearly at the opposite of the saw-toothed bar, said saw-toothed bar being provided with blocking means, both for cutting and resting steps, consisting of rounded projections on the head of the saw-toothed bar inserted inside of correspondent recesses placed in the walls of said room, and a profile for matching with said tubular body of the container. 
     Finally again according to the present invention, the core of said roll can have a reduced circumference, inside of whose holes self-blocking universal holed stoppers are placed, suitable to rotate said roll within hinges of said external closure stoppers, and the transparent plastic film around said roll is coupled to a stiffening strip on the head margin. 
    
    
     
       The present invention now will be described, by an illustrative, but not limitative way, according to preferred embodiments thereof, with particular reference to enclosed drawings, wherein: 
         FIG. 1  shows a view of the container-unroller with electric cut and tear cut of film, aluminium sheet or similar wrapped around a roll according to a first embodiment of the present invention, in use; 
         FIG. 2  shows a perspective view of some components of the container-unroller of  FIG. 1 , i.e. the cylindrical container and the closure stopper, each other apart; 
         FIG. 3  shows a perspective view of the two interchangeable devices combinable to the container-unroller of  FIG. 1 , i.e. the devices for hot electric cut and tear cut, respectively; 
         FIG. 4  shows a perspective view of a detail of the cylindrical container of the container-unroller of  FIG. 1 ; 
         FIG. 5  shows a perspective view of components of the device for tear cut of the container-unroller of  FIG. 1 , as when the assembling is carried out; 
         FIGS. 6 a  and 6 b    show a side view of the device for tear cut of the container-unroller of  FIG. 1  in cutting and resting position, respectively; 
         FIG. 7  shows an exploded perspective view of the components of the container-unroller of  FIG. 1 ; 
         FIG. 8  shows a perspective view of one portion of some components of the container-unroller with electric cut and tear cut of film, aluminium sheet or similar wrapped around a roll according to a second embodiment of the present invention; and 
         FIG. 9  shows a perspective view, partially in transparency, of one portion of the device for hot electric cut and tear cut of the container-unroller of  FIG. 8 . 
     
    
    
     Firstly with reference to  FIGS. 1-7 , wherein the container-unroller with electric cut and tear cut of film, aluminium sheet or similar wrapped around a roll, i.e. components thereof, according to a first embodiment of the present invention, are shown, the cylinder container A is the basic instrument with overlapping track  16  for bayonet insertion of a device B for hot electric cut by means of extended steel wire  26 , suitable to cut transparent plastic film  1  in less than one second, or alternatively for the insertion of the device C for tear cut by means of saw-toothed bar, which is suitable to cut, in addition to transparent plastic film, also aluminium sheet or similar, generally used for food product storage. 
     One of the new elements of the container-unroller according to the present invention is the container-unroller with internal mechanism allowing the film  1  or similar to be extracted manually, preventing from re-entering. A further innovation of the container-unroller according to the first embodiment of the present invention is that, over the rib of the cylinder container A, approximately 2 cm from slit  12  for the passage of the film or sheet  1 , a track  16  occurs, allowing the bayonet insertion of the two devices provided for the cut, both mountable on the container, but are separately used depending on designed use. 
     Advantages as to hygiene and practicality resulting from the subject invention are apparent: when device B for electric cut is mounted on the container, it is possible unrolls the film  1 , as desired, by one hand, meanwhile the container-unroller, i.e. the object of the present invention, is hold by the other hand. Pressing switch  10 , placed in the centre of device B, more or less under the thumb, the circuit will be closed resulting in the heating of the extended steel wire  26 , contextually with a simple rotation of the wrist, the film will be cut as result of said wire contact. Above-mentioned wire is placed approximately 3 cm from the slit  12 , determining distance, since after the cut, the film remains outside of the container as necessary for successive use, thus allowing an easy catch of the head edge. 
     When, on the contrary, the device C is mounted on the container, before of the use the saw-toothed bar  28  is to be placed in cut position ( FIG. 6 a   ) by means of tab  34  placed in the centre of the device. The saw-toothed bar  28  is blocked both in cutting ( FIG. 6 a   ) and resting ( FIG. 6 b   ) step by means of tonguing elements. In cutting step, one hand unrolls the film  1  as desired, while the other hand catches the found element, then a light tear movement is carried out suitable the film  1  to be cut. After the use, said tab  34  is upward moved, switching said saw-toothed bar  28  in resting safe position. The saw-toothed bar is located, as the extended steel wire  26  of the device B, approximately 3 cm apart from the slit, in order to have the same cut point but above all due to above said reasons in order to facilitate the successive use. 
     Particularly, the container-unroller with electric and tear cut, mechanism for the anti-rewrapping one-way extraction of film, aluminium sheet or similar around a roll, according to the first embodiment of the present invention, as shown with reference to  FIGS. 1-7 , consists as below described. 
     The cylinder container A has a tubular shape, little larger than roll  5  to be contained (diameter from approximately 5 to approximately 8 cm and length from approximately 30 to approximately 50 cm), opened along all the length thereof; the two threaded ends touch to each other, while the middle part remains detached being wider and designed to be the slit  12 . Threaded ends are overlapped allowing tooth  38 , placed in the middle of mutually notched threads (as shown in  37 ), can enter and preventing from whichever movement cylinder container A already before the closure obtained by means of appropriate closure stoppers  2 , blocking and closing the same leaving an opened slit  12  from which film, aluminium sheet or similar  1  will escape. After the closure of the cylinder container using the closure stoppers  2 , the structure of the container-unroller will prove to be more resistant and compact. The slit  12  remains opened for approximately 3 mm for a length of approximately 30 cm; on a side a decreasing stiffening rib  13  of approximately 4 mm for 7 mm running along the length of the tube to external stopper thread occurs, thus resulting in a more hard slit edge  12 . On the other side of slit  12  there is a decreasing rib of approximately 3 mm×approximately 1.5 cm, with a middle channel resulting in higher rigidity and acting as guide track  16  for the bayonet insertion of devices B and C. 
     The device B integrally consists of hard plastic, has a semi-tubular shape containing an accommodation room for rechargeable batteries  9 , with a switch  10  in the middle. On the upper part an extended steel wire  26  runs that by means of said switch closes the circuit resulting in wire heating. Under the steel wire, in order the underlying plastic to be protected, there is a strip of an insulating and heat resistant material. On the lower part of the device B, there is a profile  15  allowing the bayonet to be inserted in track  16  on the cylinder container. 
     The device C has more or less the same shape and largeness as the device B, consisting integrally of hard plastic, except that instead of the steel wire there is a saw-toothed bar  28 , thus cut points occur at the same height. 
     The saw-toothed bar  28  is a component of the device C, with a cylindrically shaped base  30  that, placed in a room  33 , rotates for about half-turn around axis thereof on two axial hinges  31 , passing from cutting to resting position. Hinges  31  of saw-toothed bar  28  are at the edges of the same and rotate within the circular holes  32  occurring at the centre of room walls, the whole being operated by a finger through the tab  34  located on the opposite of the saw-toothed bar; said saw-toothed bar is blocked both in cutting and resting step by means of joints, which are simply round projections  44  on the head of the saw-toothed bar inserted by means a pressure in recesses  46  located in the room walls. 
     The tab  34 , remaining outside of the room, is manipulable through the opening  35  placed in the centre of the room  33 , which is opened as necessary to allow the cylindrical base  30  of saw-toothed bar  28  can enter and rotate therein, leaving outside the latter. 
     In resting position the saw-toothed bar  28  is safe, being placed towards the bottom and joint blocked. 
     On the lower part of device C there is a profile  15  allowing the bayonet to be inserted in track  16  on the container. 
     The above-mentioned devices are both mountable on the cylinder container A, but the same will be used separately depending on the intended use; therefore, only at loading time of material type around the roll inside of the container, the device type to be mounted will be selected. 
     The device B with means for electric cut, is provided with contacts for recharge occurring using an appropriate a battery charger (not shown), made of hard plastic with such a shape to accommodate all the container-unroller object of the invention in vertical position, supporting and protecting the same with a shell protection bar located at one end of the base and extending upwardly along all the lateral surface of the cylinder container A. 
     Two external stoppers  2  are similar, consisting of a circular base, with an inner threaded external edge  24  approximately 12 mm high and an inner smooth edge  14  that, according to a sectional view, is triangular and approximately 8 mm high. The shape of inner edge  14  facilitates the entrance of the threaded portion of the cylinder container A in the space defined between said external edge  24  and said inner edge  14 ; in the screwing step, in fact, the threaded portion of the cylinder container A at the start contacts the upper and more flexible portion of inner edge  14  and proceeding in the screwing contacts the harder lower portion. The two edges, i.e. external and inner  24  and  14 , respectively, are apart from each other like the thickness of threaded sides of the cylinder container A so that, in closing step, i.e. during the screwing of the stoppers  2  around the ends of the cylinder container A, the two edges, external and inner  24  and  14 , respectively, block the cylinder container A and support the same defining the structure of the container-unroller object of the invention and leaving opened only the slit  12  as necessary for the sliding of film  1  or similar. 
     In the centre of stoppers  2 , there is a circular hinge  18  with diameter of approximately 14 mm, height of approximately 4.5 cm; the base thereof having a knurled surface  23  joint inserted in a correspondent knurled area of the hole of a spring washer  3  acting to prevent the rotation of roll  5  in a direction different than desired. 
     The washer  3  has, in fact, in the centre a circular knurled hole, with a diameter of approximately 15 mm. The washer  3  has a fixed edge for the three quarters of circumference thereof, approximately 4 mm high; the last length thereof being arched inwardly to generate a spring tooth  22 , free and detached from the washer  3  circumference, characteristic allowing a light spring movement, thus forcing an holed toothed stopper  4 , once inserted into the washer  3 , to rotate only in one-way and blocking it for the other one. 
     The external stopper  2  and washer  3  can be produced as a single part. 
     The holed universal toothed stopper  4 , occurring only on one of two roll  5  sides, is shaped as a toothed washer with a central hole having a diameter of 15 mm, and an extension consisting of a set of alternated vertical indentations along all the circumference, resulting in raised arched fins  40 , that when the roll  5  of film or similar is inserted into the hole  5  are flexed resulting in an inside accommodation and blocking. 
     The toothed portion of stopper  4  has a circumference little smaller than the inner edge of washer  3 , in order to rotate inside and interact with the spring tooth  22 , forcing said toothed stopper and consequently film roll  5  to rotate on hinge  18  of the fixed stopper only in exit direction, therefore creating an unidirectional movement. 
     The universal holed simple stopper  6 , occurring on the opposite side of roll  5  with respect to toothed stopper  4 , is shaped as a simple washer with an extension consisting of a set of vertical alternated indentations along all the circumference, resulting in raised arched fins  40 , that when the roll  5  of film or similar is inserted into the roll  41  are flexed resulting in an inside accommodation and blocking. In the centre there is hole with a diameter of approximately 15 mm, allowing the roll  5  of film to be rotated in hinge  18  of the unscrewable stopper. 
     Two just described stoppers  4  and  6  act self-blocking inside of the holes of film or similar roll  5  and to rotate the latter within hinges  18  of the closure stoppers  2 . 
     A film or similar roll  5  particularly suitable to be used with the container-unroller of the present invention has a standard size of approximately 30 cm and is made of cardboard, similar to those already commercially available, with the difference of having a smaller circumference in order the volume of rolled up film or similar to be increased and holed stoppers at the ends as above described, namely. a simple  6  and a toothed  4  stopper. Preferably, the rolls  5  of transparent plastic film have on the head edge of the film a strip  20  of rigid paper having a width of approximately 4 cm thus making practical the loading of the film into the slit  12  of the cylinder container A. When the closure stopper  2  is opened, the slit  12  is released, the roll  5  in inserted within the cylinder container  2  by sliding the same longitudinally and at the same time the edge of head of the film, whereon the strip  20  of rigid paper is fixed, is passed through the slit  12 , avoiding complications as for example the film curling. Therefore, once the cylinder container A is closed by screwing again the closure stopper  2 , film  1  will be in position suitable to the successive extractions, i.e. it will remain outside of the slit  12 , until the film  1  is finished. 
     Obviously, the container-unroller object of the invention is suitable also for use with any roll type of film or sheet  1  as those already on the market, the arched fins of the holed universal toothed stoppers, namely 4 toothed and 6 simple stopper, allowing the stoppers to be accommodated at the different hole diameters of film or similar rolls already on the market. 
     The device comprises moreover a pyramidal spirally shaped spring, having a narrower side inserted and blocked in the grooves of the hinge of the closure stopper  2  and it acts keeping under a light pressure all the above listed inner components, particularly toothed stopper  4  inside of the edge of spring washer  3 . Moreover, the role of this spring  7  is crucial in order the commercially available rolls to be accommodated being of different lengths. 
     Obviously, the container-unroller according to just described embodiment of the present invention, with respective cut devices B and C, can have different sizes than above described in order to be accommodated according to the different roll sizes allocable therein. 
     With reference to  FIGS. 8 and 9 , some details of a container-unroller according to a second embodiment of the present invention are shown. 
     In particular, the  FIG. 8  shows a cylinder container A′ that, close to the slit  12 ′ has an opened semi-cylindrical element  51 , whose structure is jointed to that of the cylinder container A′, and inside therein is located a device D provided both with means for electric cut and means for tear cut. In particular, the device D has a cylindrical shape and has along a directrix thereof a groove  52 , running along all the length of the device D and, together with a further groove  52 , along a diametrically opposite directrix, provides an insertion seat for two corresponding portions with toothed profile  53  placed at the two ends of said opened semi-cylindrical element  51 . On the two portions of the device D defined by the two grooves  52 , there are on one side an extended steel wire  26 ′ and on the other one a saw-toothed bar  28 ′. By means of snap insertion within the seat defined by the opened semi-cylindrical element  51 , the device D can therefore alternatively display outwardly the extended steel wire  26 ′ or the saw-toothed bar  28 ′. 
     The internal surface of the opened semi-cylindrical element  51  displays a longitudinal groove  54 , inside of which is placed the saw-toothed bar  28 ′ when the same is in resting position (that is it is not towards the outside). 
     According to this embodiment, it is considered the use, on a side of the cylinder container A′, of a second closure stopper  8 , shaped in such a way to act as accommodation for electric power supply of the system for hot electric cut, being provided with an axially positioned, hollow cylindrical hinge  55  having the same length as said cylinder container A′, wherein batteries  9 , an amplifier and a timer are accommodated. 
     As to the remaining, the container-unroller according to the second preferred embodiment of the present invention has the same elements as the container-unroller according to the previously shown first embodiment. 
       FIG. 9  finally shows, with reference to the second embodiment of the present invention, a particular trick, applicable also to the first embodiment necessary to assure that the extended steel wire  26 ′ is not loosened due to the expansion as a result of the heating. In particular, one or both the ends of the wire  26 ′ are joined to a respective small piston sliding inside of a seat  57  axially defined inside of the body of the device D, through the coupling with an hinge  58  of said small piston  56 , passing through an opening  59 , occurring on the surface of the device D. On the small piston  56  a spring  60  acts, pushing the small piston  56  towards the end of the device D, stretching the wire  26 ′. 
     The present invention has been described by an illustrative, but not limitative way, according to preferred embodiments thereof, but it is to be understood that variations and/or modifications can be made by those skilled in the art without departing from the scope thereof as defined according to enclosed claims.