Unscrewing device for threaded plastic caps

Abstract: Unscrewing device of threaded plastic plugs applied to bottles basically constituted by a handle formed by a longitudinal element (11) suitably shaped from an end of which departs a cylindrical ring (12) interrupted for a suitable length (T) so that its free end is in proximity of the said free end of the element (11) from which said cylindrical ring departs and from extends outwardly a curved element (13) directed in a direction opposite relative to said longitudinal element and forming a trigger. Inside the cylindrical ring (12) can be inserted in succession, ulterior reducing rings (22-32) too interrupted with relevant lengths (T1-T2) and presenting diameters progressively decreasing. Inserting the plug to be unscrewed in the rings (12-22-32), the user grips the longitudinal element (11) and exerts with the index finger a traction (R) on the trigger (13) producing a gripping of the plug so that upon rotation of the longitudinal element (11) round the axis of the plug produces the unscrewing of it

Description: The present invention relates to a device for unscrewing threaded plastic plugs usually applied to bottles, in accordance with the preamble of claim 1. As known from time threaded plastic plugs are used for various utilizations, particularly to cork glass or plastic bottles. A widespread use of these plastic plugs is the one to plug plastic bottles containing mineral waters, various drinks or other liquids. As also known, often, the plugs applied for various reasons result unlikely unscrewing by only and simple grip and at times even impossible so to require the use of various and always inappropriate means that involve complicated manoeuvres and that often can cause breakage and anyhow various drawbacks. A cap remover tool of the type described in the prior art portion of Claim 1 (US-A 4,509,784) is known in which the cap remover includes a split ring and a pair of handles to actuate the split ring. The tool of this kind has the disadvantage of concentrating the compression on two opposite points of the cap. As a consequence, a cap of plastic material could be so deformed as to cause a not correct grasp between the cap and the threaded neck of the container during the screwing and the unscrewing operations. Morevoer, this kind of cap remover is provided with protruding and opposite stop shoulders that could disadvantageously act as a fulcrum for breaking stresses of the hinge of the handles. The object of the present invention is to obviate to the difficulties and drawbacks above mentioned. This object is attained in the invention by a device as defined in the appended claims. To better understand its characteristics and the advantages of utilization, the present invention is described only by way of example and not limitative, in a preferred possible shape of realization with reference to the drawings enclosed in which: the fig. 1 shows by a lateral view the device that is the object of the present invention; the fig. 2 is a sectional view drawn along the line I-I of fig. 1; the fig. 3 illustrates by an enlarged view the detail of the gripping part of the plugs of the device of fig. 1; the fig. 4 is a sectional view drawn along the line II-II of the detail of fig. 3 equivalent to the sectional view drawn along the line I-I of fig. 2. In such figures the common parts are reported by the same references. With reference particularly to the figures 1 and 2 it is noted as the device 1 that is the object of the present invention is fundamentally constituted by an elongated element 11 shaped in the form of a handle and an annular element formed as a cylindrical ring 12 extending from one end of said handle. Said ring 12 is interrupted for a discrete length along its circumference so that the free end of said ring is adjacent to said one end of the handle 11. A curved element 13 is formed at the free end of said ring 12 so as to extend in a direction opposite to said handle and to form a trigger. In particular, figure 1 shows that the internal concave part 131 of the curved element 13 is connected to the external edge of said cylindrical ring 12 with a suitably radiated lenght 132. The internal surface of said cylindrical ring 12 is moreover suitable notched by a plurality of light indentations 14 able to engage themselves in the corresponding indentations that usually are executed on the external cylindrical surface of the plugs. Inside the said cylindrical ring 12, it is possible to insert at least a first reducing cylindrical ring 22 and if necessary on the inside of this, also a further second reducing cylindrical ring 32. In the fig. 4 for clarity the first reducing ring 22 is illustrated in inserted position while the second reducing ring 32 is illustrated in external position before the insertion in the previous. Both said reducing rings 22 and 32 obviously are interrupted along their circumference in such a way as to present a relative discrete interruption length, respectively T1 and T2. Also the inside surfaces of said reducing rings 22,32 will be suitably notched as the cylindrical ring 12 by relative pluralities of light indentations respectively 24 and 34, moreover preferably from one of the lateral edges of each of such reducing rings 22,32 a little flange, respectively 25 and 35 will protrude outwards The cylindrical ring 12 will have a radial fairly thin thickness equal to about the half of its length in axial direction (pratically about mm 4) so as to obtain a sufficient mechanical resistance of the same as well as a suitable elastic deformation and the radial thicknesses of the said reducing cylindrical rings 22,32 will also be fairly thin (about mm 3) so as to permit a suitable elastic deformation. The said first and second reducing rings 22 and 32 have an external diameter equal respectively to the internal diameter of the cylindrical ring 12 and of the first reducing ring 22 so that the first reducing ring 22 can be inserted in the cylindrical ring 12 and the second reducing ring 32 can be inserted in its turn in the previous first reducing ring 22. Clearly the flanges 25 and 35 of the reducing rings 22-32 have the function to stop the insertion of the latter in the correct position of application preventing so that they get out from the part opposed to the utilization part, moreover the insertions will happen with a suitable interference so that the said reducing rings 22 and 32, when applied, remain fixed even if they can be easily taken out. The internal circular edges 121 of the cylindrical ring 12 as well as the external 222,322 and internal 221,321 circular edges of the reducing rings 22,32 are chamfered in order to facilitate the mutual insertion of said rings 12,22,32 into each other as well as the insertion in them of the plugs to be unscrewed. The device 1 and the relative reducing rings 22 and 32 will be obtained by simply molding of a suitable plastic material. Having described the device that is the object of the invention, its use will be described here below. The user first of all will adapt the device to the plug to be unscrewed. To do this operation, if the diameter of the plug coincides or is fairly smaller than the diameter of the cylindrical ring 12, the user will take away both the reducing rings 22-32 and will insert the said cylindrical ring 12 on the plug then will grip the element 11 putting the index finger in the internal concave part (131-132) of the element 13. At this point by the index finger he will pull the element 13 towards the element 11 as clearly indicated in fig. 1 by the arrow R causing consequently a reduction of the interrupted lenght T of the cylindrical ring 12 that will warp elastically shortening his diameter until it engages itself with its indented internal surface (14) against the external surface of the plug causing so a remarkable scarfing that forbids every reciprocal slip when the whole device 1 is rotated round the axis of the plug to be unscrewed. In the case that the plug to be unscrewed has a diameter that can't be clamped by the cylindrical ring 12, the user will insert the first reducing ring 22 and eventually also the second reducing ring 32 until he reaches the external diameter of the plug in question and then will proceed to effect the unscrewing of it in the way above described. The said reducing rings 22 and 32 can run reciprocally in circle between themselves as well as to the cylindrical ring 12 that contains them so that practically the clamping force R does not appreciably increase. It is pointed out that since the said reducing rings 22 and 32 can run reciprocally, they can be applied placing them with their interruption lenght T1 and T2 in every position, moreover given the symmetriy of the opposite faces of the device 1 and particularly of the hole of its cylindrical ring 12, the insertion in it of the said reducing rings 22 and 32 can happen by both the parts and moreover the same device 1 can be applied on the plug to be unscrewed in two symmetrically opposite ways permitting so to be used advantageously also by left-handers. It is pointed out that after the use one or both the reducing rings 22 and 32 having been removed for the use, can be reinserted in order to prevent them from getting lost. From what it has been expounded, the device 1 that is the object of the present invention clearly permits to obtain not only the remarkable advantage to effect the unscrewing of the plugs from relevant bottles when they are fixed in such a way that they can't be taken away using only the hands but also to permit to do such operation on plugs having various diameters. Clearly the diameter of the cylindrical ring 12 in the shape of realization to which it is done reference is of about mm 32, and can be increased so as to permit the use of the device 1 on plugs having greater diameters, moreover the number of the reducing cylindrical rings can be greater than the one expounded permitting so to increase the diameter range of the plugs on which it will be possible to operate. It is well understood that it will be possible to bring these and other variations to the device that is object of the present invention without however to go out of the context of what is described and hereinafter claimed.

Claims: Device for unscrewing threaded plastic plugs, said device comprising an elongated element (11) shaped in the form of a handle, an annular element formed as a cylindrical ring (12) extending from one end of said handle (11), said ring (12) being interrupted for a discrete length (T) along its circumference so that the free end of said ring (12) is adjacent to said one end of said handle (11); said device being characterized in that: a curved element (13) is formed at the free end of said ring (12) so as to extend in a direction opposite to said handle (11) and to form a trigger, the concave part (132) of which can accomodate the index finger of a user, so that upon insertion of a plug to be unscrewed in said cylindrical ring (12), gripping the handle (11) and putting the index finger in said element (13) and producing a traction (R) towards said handle (11), said ring (12) grips the plug and rotation of the device around the axis of the plug results in unscrewing of the plug; the device comprises furthermore a set of reducing rings (22-32) interrupted along their circumferences for a given length (T1-T2), said reducing rings (22-32) having progressively smaller diameters so as to be insertable into each other, the inside of said ring (12) being able to accomodate in succession said reducing rings (22-32), whereby the insertion of such reducing rings (22-32) enables the use of the device on plugs having progressively smaller diameters, the internal surfaces of said cylindrical ring (12) and of said reducing rings (22-32) being preferably notched by a plurality of light indentations (14-24-34) in order to increase their gripping action on the plug to be unscrewed. The device according to claim 1, characterized in that the internal circular edges (121) of the cylindrical ring (12) as well as the external (222,322) and internal (221,321) circular edges of the reducing rings (22,32) are chamfered in order to facilitate the mutual insertion of said rings into each other as well as the insertion in them of the plug to be unscrewed. The device according to the preceding claims, characterized in that a small flange (25-35) extends outwardly from one of the external circular edges of said reducing rings (22-32) to stop the insertion of said reducing ring in a correct position of insertion preventing it from passing through and being ejected through the other side from the ring into which it is inserted.

Inventors: ROVEDO FRANCO, ROVEDO, FRANCO
Applicants: DEL COL LILI, DEL COL, LILI
Application year: 1996
Main classification: B67B7
IPC codes: B67B7