METHOD AND APPARATUS FOR TREATMENT OF COMPACT DISCS

Abstract: Apparatus for rendering a compact disc unplayable comprises first and second pressing elements and at least one spoiling element interposed between the pressing elements. The pressing elements are adapted to be brought together to press the spoiling element against a disc placed therebetween thus causing damage to the information bearing surface of the disc. In a preferred embodiment, the or each spoiling element includes scraping means which may comprise a serrated blade or an abrasive material. Rotation of the disc relative to the scraping means when the disc is sandwiched between the pressing elements results in the disc's information bearing surface being scratched or otherwise damaged. A method of rendering unplayable a compact disc is also described.

Description: METHOD AND APPARATUS FOR TREATMENT OF COMPACT DISCS The present invention relates to a method and apparatus for destroying or damaging compact discs and the like so that they are rendered unplayable. Compact discs are most widely known for their use in the music and entertainment fields and in electronic publishing and are increasingly being used as a convenient data storage medium for business and government use. The discs carry digitally encoded information on one surface thereof which can be read by a laser in a CD-player or disc-drive. A significant amount of data can be held on a single disc and thus enormous savings in terms of storage costs can be achieved as compared with traditional paper systems. However, as with paper records, there comes a point when the data held on the disc is no longer required, for example because the recorded data is obsolete or because statutory obligations to retain the data for a minimum period of time have expired. The question then arises as to how to dispose of the discs without risking any of the potentially confidential or sensitive information recorded on them falling into inappropriate hands. A similar problem arises in connection with substandard discs which may be returned by dissatisfied purchasers to a retailer or distributor. For instance, there is a possibility that returned discs may be stolen, or accidentally or deliberately re-sold, and then passed on to unsuspecting consumers with the consequent risk of further damage to the manufacturers reputation. Accordingly, it is an object of the invention to provide a convenient method for destroying or otherwise spoiling a compact disc to render it unplayable. It is a further object of the invention to provide apparatus for rendering unplayable the information bearing surface of a compact disc. Accordingly, from one aspect the invention resides in a method for rendering unplayable a compact disc, comprising placing the disc between first and second pressing elements, bringing said first and second pressing elements together so that the disc is trapped therebetween and is pressed against one or more disc spoiling elements adapted to damage the face of the disc on which the information bearing surface is provided. It will be appreciated that usually only one surface of a conventional compact disc has digitally encoded information thereon which is adapted to be laser-read and this surface is coated with a thin film of aluminium which, in turn, has a protective coating of lacquer. For convenience, however, the face of the disc which comprises these constituent layers shall hereinafter be referred to simply by the term "information bearing surface " . From another aspect, the invention resides in an apparatus for rendering a compact disc unplayable comprising first and second pressing elements and at least one spoiling element interposed between the pressing elements, the pressing elements being adapted to be brought together to press the spoiling element against a disc when placed therebetween thereby to damage the information bearing surface of the disc. By means of the aforementioned method and apparatus, it is possible to render a compact disc unplayable by virtue of damage caused to its information bearing surface. In this way, unwanted or substandard discs can be disposed of without risking the information contained on them being accessed through a conventional CD-player or disc-drive. The action of pressing the pressing elements together may or may not result in the two elements coming into contact with each other. In some circumstances, for example, the pressing elements will remain separated by virtue of the spoiling element(s) and/or disc interposed between the two. The spoiling element or elements interposed between the first and second pressing elements may take a number of forms and preferably is/are associated with one of the pressing elements, for example, being integral with the pressing element(s) or. more preferably, retained on or by the pressing element(s). However, it will be understood that the or each spoiling element may equally be separate from the or each pressing element but maintained in position to act on the disc such as by the gripping action of the pressing elements as they are pressed towards each other. In one embodiment of the invention, the spoiling element may comprise one or more electrically heated elements which, when heated to a desired temperature and pressed against the disc by the action of the first and second pressing elements, causes damage to the information bearing surface of the disc rendering it unplayable. For instance, the heat may cause melting of the lacquer coating resulting in an uneven surface finish or discolouration sufficient to prevent the disc from being laser-read. It is however preferred that the apparatus according to the invention be manually operated without the need for an external or internal power source. For example, in another embodiment, the spoiling element may comprise one or more upstanding blades which when pressed against the disc causes the disc to break into two or more separate pieces. While it is possible for each of the pressing elements to carry one or more blades so that the disc is "attacked * ' from both faces, it is also an option for only one of the pressing elements to carry blade(s). If only one blade is provided, it may be useful to position the blade in such a way that it dissects the disc into two unequal segments offset from its central hole, in this way the broken disc can be rotated about its hole and second and further cuts made as desired. If more than one blade is provided, these are preferably arranged parallel with each other. In order to reduce the possibility of damage to the pressing element opposite the or each blade and towards which the blade is urged during carrying out of the method or operation of the apparatus, the pressing element may be provided with one or more recesses corresponding to the position(s) of the opposing blades. In this way. each blade or at least a projecting portion thereof can enter a complementary recess on the opposing pressing element as the disc snaps or breaks. Alternatively, the disc may be accommodated in such a way as to rest above and/or below hollow interiors of either or both pressing elements. As an example, one of the pressing elements may be provided with a disc locating ridge around an inner circumference of a perimeter wall. When located on the ridge, the disc encloses a hollow space which may contain one or more blades in addition to that or those carried on the other pressing element. Most preferably, the disc locating ridge permits the disc to rest at a height such that any underlying blade is in contact with or lies just below the opposing face of the disc. Conversely, the blade or blades provided on the other pressing element (that is, the pressing element which does not have the disc locating ridge) project sufficiently so that at least one blade contacts and presses against the other face of the disc as the pressing elements are brought together. As an alternative to a disc locating ridge, the disc may be supported from below by a resilient material, such as by one or more pieces of foam rubber or plastic. The depth of the resilient material is preferably selected such that during carrying out of the method or operation of the device the material is in a compressed state and by virtue of its resilience urges the disc towards the or each spoiling element. Conveniently, the first and second pressing elements may be pivotally connected to each other, such as by means of one or more hinges or the like. In this way, when the spoiling elements take the form of one or more blades, alignment of the blades and the corresponding recesses may be reliably achieved. Advantageously, the or each blade is orientated parallel with the "pivot axis" of the pressing elements, that is the imaginary line that runs between the hinged edge of a pressing element and its opposite "free " ' edge. A further benefit is achieved by such pivotal connection and blade arrangement, namely by virtue of the pressing elements being pressed together in an angular manner, the disc is initially gripped on one face at a point towards one edge thereof by a blade and the point force of the blade acting on the disc from that edge results in an applied torque on the disc. The applied torque or leverage about a point is beneficial as promotes breakage of the disc. The applied force to the disc may be further enhanced by means of a separate lever arm. For example, such a lever arm may be pivotally connected to an edge of one of the pressing elements at a position opposite the pivotal connection between the two pressing elements. By such means, first and second pressing elements are brought together angularly, like closing a book, and the lever arm is then brought down over the free edge of the pressing element which is not pivotally attached to the lever arm. In this way. the torque applied by the lever arm at the free edge of the pressing element is translated to the contact point between an upstanding blade and the disc. Advantageously, the lever arm is provided with a projection at or close to its free or distal end. such projection at least initially contacting an outer face of the pressing element adjacent its free edge when carrying out the method of the invention or during operation of the device. In a yet further embodiment of the invention, the spoiling element may comprise scraping means for abrading the information bearing surface of the disc. In order to be fully effective however, it is important that the scraping means and/or disc are permitted to move relative to each other at the same time as the two bear against each other. Such relative movement may be conveniently achieved by rotating the disc relative to the scraping means or vice versa. In this way, the information bearing surface of this disc becomes scratched or otherwise damaged by the action of the scraping means on it. The scraping means may also comprise one or more projecting blades, ideally with a serrated edge to cause most damage. In such an embodiment, there is no real advantage in providing recesses on the opposite pressing member because the intention is not to break the disc with the blade(s) and. in any event, the relative rotation between the blade(s) and the opposing pressing element means that the blade(s) and recesses would rarely be in alignment. As a variant, the scraping means may be in the form of an array of pins or other sharp protrusions projecting from one or both of the pressing elements and having sufficiently sharp free ends to score the information bearing surface as they are moved across the said surface. The pins or projections may be provided in a regular or an irregular array, but preferably are so arranged as to cause damage across substantially the entire information bearing surface. More preferably, however, the scraping means simply comprises an abrasive material which for example is laid on or fixed to one or both pressing elements. Sand or grit paper may be used, both of which are easily replaceable on signs of wear, but harder-wearing materials are more suitable. Indeed plastics materials embedded with chips of hard plastics are known and are particularly suitable. Another means suitable for damaging the information bearing surface of the disc by abrasion is by featuring a surface of the or each pressing element which is pressed against the disc, for example, to give a rough or knurled surface. Such a surface is preferably of metal in order to maintain its abrasiveness throughout the lifespan of the device, although other such tough materials are also contemplated. While not essential, the abrasive material or the abrasive surface of the pressing element preferably extends over an area sufficient to cover the information bearing surface of the disc when the apparatus is used. It is also preferred that both pressing elements are provided with an abrasive material or an abrasive surface. In this way, it does not matter in which orientation the disc is placed on the apparatus. So far as the pressing elements themselves are concerned, ideally first and second pressing elements should be provided with complementary features, each fulfilling a different role but in combination providing both the key and the preferred features of the invention. For example, the first pressing element may be provided with features for retaining the disc thereon, and the second pressing element is provided with or carries the spoiling means. In general, it is not necessary to provide spoiling means on both pressing elements because only one face of the disc is required to be damaged and therefore the orientation of the disc on the device will be chosen accordingly. However, and as already mentioned in relation to the use of scraping means such as abrasives, the present invention does not preclude the provision of spoiling elements on both pressing elements. Indeed, this may become even more desirable in the future if both faces of the discs carry digitally recorded information. Even in this eventuality, it would be possible to treat both faces of the disc by flipping the disc over after the first face has been spoiled, though it would be more convenient to "treat" both faces at the same time. Of course, in the case of disc breakage, both faces are in any event rendered unplayable simultaneously. In a preferred embodiment, the first pressing means comprises a planar base portion and a wall portion which together define a recess in which the disc may sit. The inner circumference of the wall portion may be such that the disc fits snugly inside the recess so that any lateral movement of the disc is restricted. Indeed, the inner side of the wall may be provided with teeth, serrations or the like, to hold the disc stationary. Alternatively, or in addition thereto, the first pressing means may comprise a spindle on which the disc can be retained in position through its centre hole. The spindle may be similarly provided with teeth or serrations, preferably sharp enough to dig into the disc material around its central hole, to inhibit or prevent rotational movement of the disc. When relative rotational movement of the disc is desired, for example, when the information bearing surface is to be spoiled through the action of being pressed against scraping means, rotational movement may for example be achieved simply by rotation of one or both of the pressing elements relative to the other, either while the disc itself is held firm on the spindle (for example when the scraping means is provided on only one of the pressing elements) or while the disc is simply captive between the pressing elements but not prevented from rotating (for example when the scraping means are provided on both pressing elements). Rotational movement may alternatively be achieved by rotation of the spindle, if the disc is held in this way. In these circumstances, the spindle may extend through the pressing element to a position beyond its outer face thereby enabling an operator to grasp the end of the spindle and rotate it about its axis. More preferably, however, the spindle is attached to or integral with a handle, the spindle and handle being disposed on opposite faces of the pressing element. The handle may be of any suitable shape or configuration, for example it may be cylindrical, and ideally has a diameter and depth to allow comfortable use by an operator. A typical such handle is presented in the form of a "screw top " . To facilitate gripping and simultaneous rotation of the handle, as in a screwing action, the external surface of the handle may be knurled or otherwise featured. Another option is for one of the pressing elements to comprise a rotatable central plate and a ring portion which surrounds and retains the plate but which remains stationary in use relative to the other pressing element. The rotatable plate is preferably provided on one face with scraping means for spoiling the information bearing surface of a disc and on its opposite face with a handle, for example a crank handle, which may be manually grasped and twisted or reciprocated to cause rotation of the central plate. The other or second pressing element is desirably provided with features complementary to those of the first pressing element. For example, when the first pressing means includes a planar base portion and a wall portion defining a recess in which the disc sits, the second pressing means may also comprise a planar portion of a size which effectively covers the disc and of a depth which at least partially fits within the recess so that it also is substantially prevented from moving laterally. Such an arrangement does however permit to the first and second pressing elements to be rotated relative to each other. Where the disc is retained through its central hole by means of spindle on the first pressing element, the second pressing element may be provided with a recess to accommodate the portion of the spindle which projects through and beyond the disc. Such a recess may extend across the full depth of the second pressing element to produce a hole therethrough. Any recess should however be designed such that it does not interfere with the action of the or each spoiling element. For both functional and aesthetic reasons, the second pressing element is preferably of substantially the same outline shape as the first pressing element. Conveniently both pressing elements are substantially cylindrical, ideally in the form of plates, and preferably of slightly larger circumference than a compact disc. As will be appreciated, for the embodiments herein described, it is largely irrelevant which of the pressing elements forms the "base " element and which forms the "top" element because the apparatus can generally be operated irrespective of the orientation of the elements. Indeed, the apparatus is likely to be operated whilst being held and supported only by the hands of the operator. The apparatus may of course equally be used when supported on a surface, such as a desk or table. In the latter case, the exterior face of at least one of the pressing elements is preferably substantially planar and smooth to avoid damaging the supporting surface during use. Possibly the exterior face may be provided with feet, ideally of the non-slip variety, or one or more suction pads, to prevent the apparatus from sliding around during use. If the apparatus is provided with a lever arm. as described above, this may equally be in the form of a plate rather than a strip, for example. Where the first pressing element has a circular recess of a size to accommodate and retain a disc snugly against an inner circumference of a wall portion, the second pressing element may define a similar recess into which the external wall portion of the first pressing element fits. On the other hand, and as previously described, the second pressing element may be dimensioned so that it too is accommodated in the recess. If the first and second pressing elements are to remain stationary with respect to each other during carrying out of the method or operation of the apparatus, for example, in cases where the disc is moved against scraping means through rotation of a spindle on which the disc is held, locking means may be provided on either or both pressing elements to prevent or hinder relative rotation or other movement therebetween. Such locking means may simply take the form of a knurled or featured engaging surface on one or both interior or exterior side walls of the pressing elements to provide a friction fit. Alternatively, other complementary locking means, such as screw threads or clamping means may be provided on both pressing elements. Such complementary locking means enable pressure on the disc by the intermediate spoiling element(s) to be exerted and maintained, yet relative movement between the pressing elements substantially prevented. If the pressing elements are to be locked together such as by a friction fit. or by screw thread means, it is preferred that an exterior portion of one or both pressing elements be provided with means to facilitate their release or separation following use of the device. Such release facilitating means may be in the form of finger recesses, featured surfaces, handles or the like, enabling an operator to gain a secure grip on one or both pressing elements while the elements are pulled apart or otherwise detached from each other. Equally, if the pressing elements are to be rotated relative to each other during carrying out of the method or operation of the apparatus, each element is desirably provided with means by which an operator can firmly grasp one element or a portion thereof in one hand and press the elements together whilst at the same time initiating rotational movement. Again, finger recesses, featured surfaces, handles or the like, may provide the operator with comfortable means to achieve this. The apparatus according to the invention may be made from any suitable material. For some embodiments the pressing elements at least may be made of a tough plastics material, for example a polycarbonate, whereas for other embodiments, such as the hinged, blade version the use of steel may be more appropriate. For extended performance of the apparatus, whenever blades are included to comprise the disc spoiling means, these are preferably metallic. Periodic replacement of the blades may be required to maintain the apparatus in optimum working condition. In general, in carrying out the method or using the apparatus according to the invention, manual pressure exerted on the pressing elements (combined with rotation, as appropriate) is sufficient to cause the necessary damage to the disc. For the same reasons, the apparatus according to the invention is ideally one which is readily portable and can be used in the hands of an operator. As will also be appreciated, the apparatus according to the invention may be of relatively simple construction. In its simplest form, it requires only two pressing elements and a spoiling element. The pressing elements may be separate or may be joined to form a one-piece device. Moreover, the apparatus has further advantages in that it requires only a few. if any. moving parts and therefore there is little opportunity for malfunction. By means of the present invention therefore it is a simple matter to render unwanted or substandard compact discs unplayable. Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings in which: Fig. 1 is a perspective view of apparatus in accordance with one aspect of the invention; Fig. 2 is a perspective view of the apparatus of Fig. 1 modified in accordance with a further aspect of the invention; Fig. 3 is a perspective view of apparatus in accordance with another aspect of the invention; Fig. 4 is a perspective view of the pressing element of the apparatus of Fig. 3; Fig. 5 is a perspective view of the pressing element of Fig. 4 carrying an alternative spoiling element; Fig. 6 is a perspective view of apparatus in accordance with a yet further aspect of the invention; Fig. 7 is a view from above of a first pressing element and from below of a second pressing element of the apparatus of Fig. 6; Fig. 8 is a view of spoiling elements carried on the pressing elements of Fig. 7; Fig. 9 is a view of apparatus slightly modified with respect to the apparatus of Figs. 6 to 8; Fig. 10 is a perspective view of apparatus in accordance with another alternative embodiment of the invention showing pressing elements in open configuration; Fig. 1 1 is a view from below of the apparatus of claim 10 showing pressing elements in closed configuration; Fig. 12 is a view from one side of the apparatus of Figs. 10 and 11 ; and Fig. 13 is a view from above of the apparatus of Figs. 10 to 12. Turning first to Fig. 1. there is illustrated a first device (10) for breaking a compact disc. The device (10) comprises first and second cylindrical pressing members (12. 14) pivotally linked by a hinge (16). The lowermost pressing member (12) as illustrated has a disc supporting rim ( 18) around the inner circumference of perimeter wall (20) and a central stem (22) which together serve to position a disc (not shown) on the device. In particular, the disc will be centred on the device by means of the stem (22) passing through its central hole and its outer edge will rest on the supporting rim (18). Spoiling elements in the form of two blades (24. 26) are secured to the base (28) of the lowermost pressing member (12) and their uppermost, sharpened edges (30, 32) lie just below or in contact with the underside of the disc when the disc is resting on rim (18). The uppermost pressing element (14) also carries spoiling elements in the form of two blades (34. 36) on its base (not visible). Blades (34. 36) are offset from blades (24. 26) such that they do not touch each other when the pressing elements (14, 16) are closed together. Blades (34. 36) do however depend from element (14) such that when the device is closed, that is when pressing elements (14, 16) are brought together so that they are substantially parallel, and without a disc positioned thereon, the tips of blades (34, 36) lie below the level of rim (18). In this way, when a disc is positioned on the lowermost pressing element (12) and the elements (12, 14) are brought together, a corner of blade (36) bears down against the disc towards an edge thereof causing the disc to deform such that its lower surface is then pressed against one or both underlying blades (24. 26). As further pressure is applied by an operator squeezing pressing elements (12, 14) together, the disc is caused to snap into two or more pieces rendering the disc unplayable. The device (40) of Fig. 2 has all the features of the device (10) of Fig. 1 with the addition of a lever arm (42) which is pivotally attached to the lowermost pressing element (12) by a hinge (44) opposite the other hinge (16). Lever arm (42) is of substantially the same shape as uppermost pressing element (14), but instead of carrying one or more blades thereon, the underside is provided with projection (46). In use, a device is positioned on the lowermost pressing member (12) as described above, and uppermost pressing member (14) is lowered towards it. Once the uppermost pressing member reaches a position where the corner of blade (36) rests against the disc, lever arm (42) is lowered so that projection (46) bears against the outer face of pressing member (14). By exerting pressure on lever arm (42), additional leverage on the disc can be achieved by the operator thus increasing the force on the disc and promoting more rapid breakage. Although not illustrated in Fig. 2, the lever arm (42) may be attached to lowermost pressing member (12) in such a manner that when the device is not in use, uppermost pressing member (14) lies flat against lowermost pressing member (12), and lever arm (42) lies flat against uppermost pressing member (14). An alternative two-piece device according the present invention is shown in Fig. 3. Device (60) comprises uppermost and lowermost pressing elements (62, 64). The external perimeter wall (66) of uppermost pressing element (62) has a knurled finish and forms a friction fit with the internal perimeter wall (68) of lowermost pressing element (64). Depending from the underside (69) in use of the uppermost pressing element (64) is spindle (70) having a tapered extremity (72) to facilitate insertion through the central hole of a compact disc (not shown). The portion (74) of the spindle (70) adjacent the underside (69) is also tapered, widening as it gets closer to the underside (69). This portion (74) has sharp notches (76) which grip the perimeter of the disc around its central hole thus holding the disc firm on the spindle (70). The spindle (70) passes through a central aperture (not shown) in the uppermost pressing element (62) and is connected to screw handle (78) which sits on the outer face of the pressing element (62). The screw handle (78) can be turned by an operator to rotate the disc held on the spindle (70). In use, a disc is located and retained by spindle (70) and uppermost and lowermost pressing elements are pressed together. Due to the friction fit between the pressing elements (62. 64) relative rotation is prevented, but the disc can still be rotated by turning screw handle (78). The lowermost pressing element (64) carries spoiling element(s) (not shown) against which the disc is scraped when rotated on the spindle (70). Figs. 4 and 5 show alternative lowermost pressing elements (64a and 64b respectively). In Fig. 4. lowermost pressing element (64a) is provided with spoiling elements in the form of a pair of serrated blades (80, 82) inserted and securely retained in slots (84. 86) integral with upstanding base (88). Base (88) also has a central hole (90) through which a length of spindle (70) passes when uppermost and lowermost pressing elements (62, 64) are brought together. In use. the information bearing surface of a disc (not shown) retained on spindle (70) will be pressed against blades (80, 82) and screw handle (78) turned so that the information bearing surface of the disc is dragged across blades (80. 82) thereby damaging the surface and rendering the disc unplayable. In Fig. 5. instead of blades (80. 82), lowermost pressing element (64b) is provided with a spoiling element in the form of an abrasive sheet (92) which fits into the recess in element (64b). Abrasive sheet (92) also has a central hole (94) corresponding to the central hole (90) of the pressing element (64b). The abrasive sheet (92) may be attached to the base (88) of the pressing element such as by adhesive means. Instead of the information bearing surface of the disc being dragged across blades, as in Fig. 4. the surface is rubbed against the abrasive sheet to cause the damage and render the disc unplayable. Figs. 6 to 8 illustrate apparatus in accordance with a yet further aspect of the invention. As with the apparatus of Fig. 3. the apparatus is a two-piece device (80) comprising uppermost and lowermost pressing elements (82, 84). However, the external perimeter wall (86) of uppermost pressing element (82) fits within the internal perimeter wall (88) of lowermost pressing element (84) but is not a friction fit. Instead, there is sufficient "play" between them to allow the uppermost and lowermost pressing elements (82. 84) to be rotated with respect to each other. To assist with rotation, the external perimeter wall (92) of the lowermost pressing element (84) has a plurality of concave indentations (94) against which an operator may press his fingers to grip the element (84). ' The uppermost pressing element (82) has a handle (96) projecting therefrom also with concave indentations (98) for gripping purposes. As shown in Fig. 8. both the uppermost and lowermost pressing elements (82, 84) are provided with a spoiling element in the form of abrasive sheets (102. 104) affixed, such as by adhesive means, to the opposing faces in use of the elements (82, 84). In use. a disc (not shown) is laid on the abrasive sheet (104) of the lowermost pressing element (84) and the uppermost pressing element (82) is then laid over so that the external perimeter wall (86) sits within the internal perimeter wall (88) and effectively traps the disc therebetween. The pressing elements (82, 84) are then manually pressed together and rotated in opposite directions using their respective indentations (96. 94) as gripping aids. As relative rotation occurs, both surfaces of the disc are scraped simultaneously by the abrasive sheets (102. 104). In this way, the information bearing surface of the disc is damaged whichever the orientation of the disc in relation to the pressing elements. As an alternative arrangement to that shown in Figs. 6 to 8, Fig. 9 illustrates another two- piece device (1 10) consisting of uppermost and lowermost pressing elements (112, 114). In addition to concave indentations ( 1 16) to aid gripping by the operator, the lowermost pressing element (114) has a pair of finger recesses (120. 120') opposite each other on the external perimeter wall (1 18). These finger recesses ( 120. 120') assist the operator in separating the pressing elements ( 112. 1 14) from each other after use. Moreover, instead of abrasive sheets covering all or substantially all of the opposing faces in use of the pressing elements (112, 1 14). discrete strips ( 122) of abrasive material are affixed on each of the opposing faces to provide the necessary spoiling means. In use. a disc (not shown) is located on the lowermost pressing element (114) and retained thereon through its central aperture by means of spindle (124). When the uppermost and lowermost pressing elements (112. 114) are held together in use, spindle (124) is accommodated in a corresponding recess (126) provided in the uppermost pressing element (112). Figs. 10 to 13 illustrate another embodiment of the invention, effectively representing a modification of the apparatus shown in Fig. 9. In this embodiment, the device (130) comprises uppermost and lowermost pressing elements (132, 134) attached to each other via hinge (136). Both elements (132, 134) are provided on their opposing faces with abrasive material forming the spoiling means. While an arrangement of abrasive strips (138) is shown, it is clear that a continuous sheet of abrasive material is equally suitable for the purpose of scouring a disc surface. In this embodiment, instead of applying manual pressure on both the uppermost and lowermost pressing elements (132, 134) to press the intervening spoiling means against a disc (not shown) interposed therebetween, the two elements (132, 134) are clamped together using screw clamp (142) which is pivotally attached to the uppermost pressing element (132). The screw clamp (142) is able to pivot to allow opening and closing of the hinged pressing elements (132, 134) and is ideally located opposite the hinge (136) for maximum effect. The pressure applied to a disc by the pressing elements (132, 134) can be adjusted by screwing or unscrewing the clamp to tighten or loosen the grip as required. In this embodiment, the pressing elements are effectively locked together. Thus in order to damage the information bearing surface of the disc with the abrasive strips (138), the uppermost pressing element (132) comprises a rotatable central plate (142) surrounded and retained by a ring (144) to which hinge (136) and screw clamp (142) are attached. On its inner face in use, the rotatable plate (142) carries the abrasive strips (138) and on its outer face it carries a crank handle (146) which an operator may use to rotate the central plate (142). Like the embodiment illustrated in Fig. 9, the disc is retained in position by means of a spindle (148) projecting upwards from the lowermost pressing element (134) through the central aperture of the disc. When the pressing elements (132, 134) are closed together for use or storage, the spindle (148) is received in a corresponding recess (152) in the uppermost pressing element (132). As the devices illustrated can be used irrespective of their orientation, references to "uppermost" and "lowermost" pressing elements should be loosely construed. Moreover, although the invention has been particularly described, it should be appreciated that the scope of the invention is not limited to the particular embodiments illustrated. Accordingly, modifications and variations thereof are therefore included within the scope of the invention. For example, the blade or blades which comprise the spoiling element(s) for scraping against the information bearing surface of the disc may have non-linear scraping edges or may comprise a series of small blades arranged at varying angles, thus reducing the bending force on the blade tips with consequential benefits of increased lifespan for the blades. In addition, for safety reasons, the pressing elements may be so designed as to fit together or be locked together when the device is not in use. Furthermore, while certain features of the invention are, for clarity purposes, described in the context of separate embodiments, it should be appreciated that these features may also be provided in any combination in a single embodiment. Conversely, various features of the invention which are, for brevity, described in the context of a single embodiment, may also be provided separately in any suitable subcombination.

Claims: CLAIMS 1. Apparatus for rendering a compact disc unplayable comprising first and second pressing elements and at least one spoiling element interposed between the pressing elements, the pressing elements being adapted to be brought together to press the spoiling element against a disc when placed therebetween thereby to damage the information bearing surface of the disc. 2. Apparatus according to claim 1 , wherein the or each spoiling element is attached to or integral with a pressing element. 3. Apparatus according to claim 1 or claim 2, wherein the or each spoiling element comprises a blade which projects from and out of the plane of the first pressing element for snapping the disc into two or more pieces when the first and second pressing elements are brought together to press the blade(s) against the disc. 4. Apparatus according to claim 3, wherein the first and second pressing elements are pivotally connected. 5. Apparatus according to claim 4, wherein the or each blade is aligned parallel with the pivot axis between first and second pressing elements. 6. Apparatus according to claim 4 or 5. further comprising a lever arm pivotally attached to one of said pressing elements at a position substantially opposite the pivotal connection between first and second pressing elements for exerting pressure against an outer portion of the other of said pressing elements when the pressing elements are brought together. 7. Apparatus according to claim 6, wherein the lever arm is provided with a projection on its underside, the projection being adapted to press against an outer portion of the other pressing element when the pressing elements are brought together. 8. Apparatus according to any of claims 3 to 7. wherein the second pressing element is provided with a recess for receiving at least the projecting portion of the or each blade carried on the first pressing element when the pressing elements are brought together. 9. Apparatus according to any of claims 3 to 8. wherein the second pressing element has a hollow interior. 10. Apparatus according to claim 9, wherein a disc locating ridge is provided on the second pressing element to support the disc at a desired height above the hollow interior. 11. Apparatus according to claim 9, wherein the hollow interior is provided with one or more layers of resilient material to support the disc at a desired height. 12. Apparatus according to any of claims 9 to 1 1. wherein one or more further blades are provided in the hollow interior of the second pressing element such that a supported disc rests just above or against said further blade(s). 13. Apparatus according to claim 1 or claim 2. wherein the or each spoiling element comprises scraping means for abrading the information bearing surface of the disc. 14. Apparatus according to claim 13, wherein the scraping means comprises one or more serrated blades. 15. Apparatus according to claim 13, wherein the scraping means comprises an abrasive material. 16. Apparatus according to claim 15. wherein the abrasive material comprises sand or grit paper. 17. Apparatus according to claim 15, wherein the abrasive material comprises a knurled surface formed on one or both pressing elements. 18. Apparatus according to any of claims 13 to 17. wherein the disc is retained on the first pressing element and the scraping means is provided on the second pressing element. 19. Apparatus according to any one of claims 1 to 18, wherein the first pressing element comprises a planar base portion and a wall portion which together define a recess in which the disc may sit. 20. Apparatus according to any one of claims 13 to 19, wherein said first and second pressing elements are adapted to provide relative rotation between the scraping means and the disc to cause abrasion on the information bearing surface of the disc. 21. Apparatus according to claim any of claims 18 to 20, wherein the first pressing element includes a spindle on which the disc is retained through its central hole. 22. Apparatus according to claim 21, wherein the spindle is provided with teeth, serrations or the like, to inhibit or prevent rotational movement of the disc relative to the spindle. 23. Apparatus according to claim 22, wherein the spindle is adapted to be rotated such that a disc retained thereon may be scraped against the scraping means on the second pressing element when the first and second elements are brought together. 24. Apparatus according to claim 23, wherein the first and second pressing elements are provided with complementary locking means to hold pressing elements stationary with respect to each other after they are brought together. 25. Apparatus according to claim 24, wherein the locking means includes means to maintain pressure on the disc by the scraping means. 26. Apparatus according to claim 24 or 25. wherein the first and second pressing elements are held stationary together by a friction fit. 27. Apparatus according to claim 20, wherein the second pressing element is adapted to be rotated relative to the first pressing element. 28. Apparatus for rendering a compact disc unplayable comprising first and second pressing elements each of which is hand-held in use and includes a substantially planar surface, and abrasive means associated with one or both planar surfaces, the pressing elements being adapted to be manually pressed together to trap the disc between the planar surfaces against the abrasive means and simultaneously for one or both discs to be rotated relative to each other to abrade the information bearing surface or surfaces of the disc. 29. Apparatus according to claim 28, wherein the first pressing element comprises a planar base portion forming the planar surface and a wall portion which together define a recess in which the disc may sit. 30. Apparatus according to claim 29, wherein the planar surface of the second pressing element is adapted to be received in the recess. 31. Apparatus according to any of claims 28 to 30. wherein the first and second pressing elements are provided with means for enabling an operator comfortably to grip each element whilst pressing together and rotating one or both elements. 32. Apparatus according to claim 31, wherein the first pressing element has an external wall portion provided with finger recesses, indentations or the like for gripping the element in use. 33. Apparatus according to claim 31 or 32, wherein the second pressing element is provided with a handle on its external surface in use. 34. A method of rendering unplayable a compact disc, comprising placing the disc between first and second pressing elements, bringing said first and second pressing elements together so that the disc is trapped therebetween and is pressed against one or more disc spoiling elements adapted to damage the face of the disc on which the information bearing surface is provided. 35. A method according to claim 34, wherein the first and second pressing elements are simultaneously rotated so that the or each spoiling element is scraped across the information bearing surface. 36. Apparatus for rendering a compact disc unplayable substantially as hereinbefore described with reference to any one of Figs. 1 to 13 of the accompanying drawings. 37. A method of rendering unplayable a compact disc substantially as hereinbefore described with reference to any one of Figs. 1 to 13 of the accompanying drawings.

Inventors: MILLER HOWARD IRA, MILLER, HOWARD, IRA
Applicants: MILLER HOWARD IRA, MILLER, HOWARD, IRA
Application year: 2001
Main classification: G11B23
IPC codes: B24B23, B26B27, B29B17, G11B7, G11B23