The subject of the invention is a goods protection container unit for the sale and especially rental .distribution of information carrier discs with a central hole, such as CD-s and DVD-s, which has a house encasing a storage space suitable for accommodating the information carrier disc, the house has a house member and another house member movable with respect to it, on the internal side of the one house member and/or other house member facing the storage space there is a primary clamping unit for the temporary fixing of the information carrier disc, and the house is supplemented with a secondary clamping unit.

The invention also relates to a goods protection container unit for the sale and especially rental distribution of information carrier discs such as CD-s and DVD-s, which has a house encasing a storage space, and the house is provided with a fastening unit consisting of a locking piece and another locking piece co-operating with it,

Due to the development of information technology, digital signal transmission and data recording pre-recorded CD-s and DVD-s have become widely used on which previously recorded and stored image and sound information, such as musical recordings or films are offered for sale. Such data carriers are sold in containers and protective cases in the interest of protecting them against external effects. The containers are provided with goods protection devices to avoid shop thefts.

In the case of pre-recorded CD-s and DVD-s a group of known goods protecting devices is formed by at least partly transparent cases in the internal space of which the storage cases of the information carrier discs and signal transmitters starting off a suitable alarm device can be placed. The goods protecting cases consist of two pieces that can be taken apart, and when they are closed they are fastened together with a locking structure, which can only be opened with special tools. Such solutions are described for example in patents No. EP 402.822., US 5.904.246., US 5.901.840., US 5.850.752., US 5.598.728. and FR 2.688.483. The undoubted advantage of such goods protection devices is that they reduce the possibility of shop thefts. However, the disadvantage of these constructions is that the use of goods protecting cases increases the space demand of the displayed products on the one part, which results in a relative smaller sales area in the shops. On the other part the information carrier disc, its case and the introductory material placed in the storage case are not accessible.

This is a significant deficiency when the information carrier discs are used for rental purposes, as those who intend to rent the discs can make their choice by looking at the words and pictures on or in the storage case directly, without being restricted. Consequently goods protecting devices encasing the storage case do not suit the sales strategy and goods protection pursuits of companies dealing with CD and DVD rentals, as they cannot satisfy this double system of requirements at the same time.

Another disadvantage is that these devices only encase the protecting case, so if the goods protecting case is forced apart or the locking unit is damaged, the information carrier disc placed inside the protecting case becomes easily accessible and it can be appropriated from the place where it is displayed without any damage done to it.

Our aim with the invention was to overcome the deficiencies of the known solutions and construct a goods protection device, which provides efficient protection against the unauthorised appropriation of information carrier discs at a low cost, is easy to handle and does not require any extra space.

The construction according to the invention is based on the recognition that if suitably selected, specially shaped components are created and they are connected together in a different way than the known solutions, a thin protecting envelope can be created, which accommodates at least a part of the information carrier disc and its switching unit giving a starting signal to switch on the goods protection system in a way that the protecting envelope itself containing the CD or DVD can be placed in the internal space of the containers known in themselves, and in the case that an attempt is made to remove the protecting envelope or inactivate the switching unit the information carrier disc is damaged, so there is no point in trying to appropriate the goods. The construction according to the invention is also based on the recognition that if the envelope-like holding unit is constructed from one piece of a special shape, in which only a part of the information carrier disc can be placed, and it can be fastened to the envelope with a novel locking unit, then this envelope-like protecting device can also be placed in the original case of the information carrier disc, and so the task can be solved.

In accordance with the set aim the goods protection container unit for the sale and especially rental distribution of information carrier discs with a central hole, such as CD-s and DVD-s, - which has a house encasing a storage space suitable for accommodating the information carrier disc, the house has a house member and another house member movable with respect to it, on the internal side of the one house member and/or other house member facing the storage space there is a primary clamping unit for the temporary fixing of the information carrier disc, and the house is supplemented with a secondary clamping unit, - is constructed in a way that a protecting envelope consisting of a protecting plate and another protecting plate is allocated to the house, at least a part of the one protecting plate and the other protecting plate of the protecting envelope is separated from each other by a space, which is maximum six times the width of the information carrier disc, and so between the one protecting plate and the other protecting plate of the protecting envelope a space is created for temporarily accommodating at least a part of the information carrier disc that can be placed in the given container unit, a detent pin is placed between the one protecting plate and the other protecting plate going through the space, which can also be led through the central hole of the information carrier disc, and the protecting envelope has a fastening unit for holding together the one protecting plate, the other protecting plate and the detent pin, a switching unit suitable for sending an alarm signal is placed between the one protecting plate and the other protecting plate, and the protecting envelope is attached to the secondary clamping unit in a removable way.

A further criterion of the container unit according to the invention may be that the secondary clamping unit is placed on the internal side of the one house member and/or other house member of the house facing the storage space.

In the case of a possible version of the container unit the secondary clamping unit contains a neck protruding from the internal side of the other house member and a clamping extension situated in the continuation of the neck, and the free end of the clamping extension is situated at a distance from the internal side of the other house member, which distance is smaller than the width of the protecting envelope.

Also in accordance with the set aim the goods protection container unit according to the invention for the sale and especially rental distribution of information carrier discs such as CD-s and DVD-s, - which has a house encasing a storage space, and the house is provided with a fastening unit consisting of a locking piece and another locking piece co-operating with it, the house is constructed as a protecting envelope consisting of a protecting plate and another protecting plate, at least a part of the one protecting plate and the other protecting plate of the protecting envelope is separated from each other by a space, which is maximum six times the width of the information carrier disc, and so between the one protecting plate and 1;he other protecting plate of the protecting envelope a space is created for temporarily accommodating at least a part of the information carrier disc, a switching unit suitable for sending an alarm signal is placed between the one protecting plate and the other protecting plate, - is constructed in a way that either the one protecting plate or the other protecting plate has a free flap in the vicinity of the passage, the one locking piece of the fastening unit is fixed into the free flap in a fix position, and the other locking piece of the fastening unit is connected to the one locking piece at least partly covering the central hole of the information carrier disc, when it is being used.

From the aspect of the invention it may be favourable, if the one protecting plate of the protecting envelope is surrounded by a bordering rim and the other protecting plate of the protecting envelope is surrounded by another bordering rim, where at least a part of the one bordering rim of the one protecting plate and at least a part of the other bordering rim of the other protecting plate are inseparably fastened together by a connection edge, while in the section of the bordering rims where there is no connection edge there is a passage connected to the space.

In the case of an even further different construction of the container unit the one protecting plate of the protecting envelope has a base flap covering the central hole of the information carrier disc and half of the one side of the information carrier disc at the most, and a holding wing protruding sideways from the base flap. And the switching unit is installed in a fixed position on the internal side of the holding wing facing the other protecting plate.

In the case of a further construction of the invention the switching unit contains a passive oscillating circuit suitable for providing radio-frequency signals.

In the case of another different construction of the container unit at least a part of the one protecting plate and/or the other protecting plate of the protecting envelope is made of high-strength plastic.

In the case of another different realisation of the invention beside the detent pin protruding into the central hole of the information carrier disc the fastening unit also has a practically flexible carrying tongue inserted between the detent pin and the protecting envelope, and the carrying tongue has a breech-block temporarily preventing the sliding of the carrying tongue with respect to the protecting envelope. A version is also possible where the one locking piece of the fastening unit installed in the free flap is provided with a neck that can be led through the central hole of the information carrier disc, and the other locking piece of the fastening unit has a head that can be placed on the neck, with a cross- section larger than that of the neck.

In a further different realisation of the container unit the other locking piece of the fastening unit has a pin that can be led through the central hole of the information carrier disc and a head that can be placed on the neck and the cross-section of which is larger than that of the neck, or the other locking piece of the fastening unit has a pin that can be guided through the central hole of the information carrier disc as well as a head the cross-section of which is larger than that of the pin, and the one locking piece fixed into the free flap is provided with a reception element for receiving the neck. The one locking piece of the fastening unit fixed into the free flap is provided with a neck that can be guided through the central hole of the information carrier disc, the neck has detents suitable for flexible deformation, and the other locking piece of the fastening unit has a shoulder for dislodging the detents of the neck and a head constructed as a continuation of the shoulder.

The most important advantage of the goods protecting unit according to the invention is that due to the specially constructed protecting envelope the information carrier discs can be displayed at the place of sale so that the information carrier disc itself, the accompanying documents containing information and the storing case of the original packaging can be held in hand without the risk of the unauthorised appropriation of the product.

A further advantage is that due to the construction of the protecting envelope more original storing cases, that is more products for sale can be placed in the sales area of rental stores and shops; and the goods are not separated from the customers, which may have a favourable influence on the aesthetic effect of the sales area and also on the customers' desire to make a purchase.

It must also be regarded favourable that the protecting envelope is simple to use, the information carrier disc can be placed in it and taken out of it without needing any special skills, but the fastening unit can only be released with the help of a special opening tool. On the one part it simplifies the task of the salespersons working in the stores, and on the other part it guarantees that only those who have a special opening tool, that is salespersons, can have direct access to the products.

It is also an advantage that due to the special construction of the protecting envelope the information carrier disc intended to be appropriated may get damaged, when the protecting envelope or the fastening unit is forced open, that is in the case of a theft attempt, so there is no point in trying, which may reduce the number of attempts, and by this it may increase the safety of the displayed products and improve the income of the stores.

Below the container unit according to the invention is described in detail in connection with a construction example, bn the basis of drawings. In the drawing

figure 1 is the plan view of a possible version of the container unit according to the invention, figure 2 is a section of figure 1 taken along plane ∏-∏, figure 3 is the side-view of another version of the fastening unit of the protecting envelope, partly in section, figure 4 is the top view of a possible version of the protecting envelope according to the invention, figure 5 is a section of figure 3 taken along plane V-V, figure 6 is the side-view of a further version of the fastening unit of the protecting envelope, figure 7 is the side-view of an even further construction of the fastening unit of the protecting envelope.

Figures 1 and 2 show a construction of the container unit 50 according to the invention, which accommodates one DVD as an information carrier disc 10 with a central hole 11. It can be seen that the house 60 of the container unit 50 - in a way known in itself - consists of a house member 61 and another house member 62 constructed as a cover that can be moved with respect to the one house member 61. The information carrier disc 10 is situated in the storage space 63 bordered by the one house member 61 and the other house member 62 of the house 60, and here the central hole 11 of the information carrier disc 10 is fitted on the primary clamping unit 64 protruding from the internal side 61a of the one house member. On the internal side 62a of the other house member 62 of the house 60 there are secondary clamping units 70, which in the case of this construction contain a neck 71 protruding from the other house member 62 made of the material of the other house member 62 and a clamping extension 72 constructed as a continuation of the neck 71. The neck 71 and the clamping extension 72 are constructed in a way that the secondary clamping unit 70 bends back towards the internal side 62a of the other house member 62 in a curve. The free end 72a of the clamping extension 72 of the secondary clamping unit 70 is separated from the internal side 62a of the other house member 62 by a "T" distance.

Figure 2 shows that the "T" distance is dimensioned in a way that the protecting envelope 20 can be clamped between the internal side 62a of the other house member 62 and the free end 72a of the clamping extension 72 of the secondary clamping unit 70 in the pre-stressed position of the secondary clamping unit. As a result of this condition the "v" width of the protecting envelope 20 is larger than the "T" distance between the internal side 62a of the other house member 62 and the free end 72a of the clamping extension 72 of the secondary clamping unit 70.

Figure 2 also shows that the protecting envelope 20 consists of a protecting plate 21, another protecting plate 22 and a fastening unit 30. The one protecting plate 21 and the other protecting plate 22 form one single unit, and they enclose the space 23 in a way that the "t" distance between the one protecting plate 21 and the other protecting plate 22 is not much larger than the "V" width of the information carrier disc 10. Practically the "V" width is twice but at the maximum six times the width of the information carrier disc 10. In this case the essential requirement can be fulfilled that the information carrier disc 10 will definitely get damaged and become useless in the course of manipulating the protecting envelope 20.

The one bordering rim 21a of the one protecting plate 21 and the other bordering rim 22a of the other protecting plate 22 of the protecting envelope 20 are connected to form one piece along the connection edge 20a in a way that between a section of the one bordering rim 21a and the other bordering rim 22a a passage 25 is left free. The passage 25 connected with the space 23 makes it possible to insert the information carrier disc 10 inside the space 23, in which case it is completely covered by the one protecting plate 21 and the other protecting plate 22, in the case of this construction.

It can also be seen in figure 2 that the carrying tongue 34 of the fastening unit 30 is connected to the one protecting plate 21 of the protecting envelope 20, and the carrying tongue 34 is provided with a detent pin 33 protruding into the space 23. The detent pin 33 extends over the space 23 of the protecting envelope 20, and it is connected to the other protecting plate 22 of the protecting envelope 20 via a breech-block 35. In this way the detent pin 33 connects the one protecting plate 21 and the other protecting plate 22 via the carrying tongue 34 of the locking unit 30 attached to the one protecting plate 21 and the breech-block 35 attached to the other protecting plate "22.

Returning to figure 1 it can also be seen that the switching unit 40 is situated in the part of the space 23 of the protecting envelope 20 protected by the connection edge 20a, and this switching unit 40 is suitable for starting off the alarm signal of the goods protection system. In the case of this version the switching unit 40 contains a passive oscillating circuit 41, but it can be a unit operating on the basis of other principles. Obviously in the space 23 of the protecting envelope 20 there must always be a switching unit 40, which can emit signals suiting the alarm equipment installed in the given sales unit, not described in detail here. In the course of using the container unit 50 described in figures 1 and 2 the information carrier disc 10 attached to the primary clamping unit 64 of the one house member 61 of the container unit 50 is removed from the primary clamping unit 64 and inserted in the passage 25 between the one protecting plate 21 and the other protecting plate 22 of the protecting envelope 20. In the following through the passage 25 the information carrier disc 10 can be pushed into the space 23 of the protecting envelope. While the information carrier disc 10 is being pushed into the space 23, the detent pin 33 of the fastening unit 30 must be lifted out of the space 23 of the protecting envelope 20, so that the information carrier disc 10 can be inserted without the detent pin 33 damaging it.

When the information carrier disc 10 is completely inserted into the space 23 of the protecting envelope 20, the central hole 11 of the information carrier disc 10 stops right under the detent pin 3,3 of the fastening unit 30. At this point the detent pin 33 is guided through the central hole 11 of the information carrier disc 10, the detent pin 33 gets into the breech-block 35 situated in the other protecting plate 22 of the protecting envelope 20 and gets in a locked position, and by this the information carrier disc 10 and the one protecting plate 21 - the carrying tongue 34 - the detent pin 33 - the breech-block 35 - and the other protecting plate 22 are linked together. Due to this connection the detent pin 33 of the fastening unit 30 co-operating with the protecting envelope 20 does not allow the information carrier disc 10 being pulled out of the space 23 of the protecting envelope 20.

After locking the information carrier disc 10 in the space 23 of the protecting envelope 20, the protecting envelope 20 can be inserted between the internal side 62a of the other house member 62 of the container unit 50 and the free end 72a of the clamping extension 72 of the secondary clamping unit 70. If the external dimensions of the one protecting plate 21 and the other protecting plate 22 of the protecting envelope 20 are right, then the protecting envelope 20 lies against the internal side 62a of the other house member 62 of the house 60, and so the one house member 61 and the other house member 62 of the house can even be closed up.

When potential customers hold the container unit in their hands and open out the one house member 61 and the other house member 62, then the protecting envelope 20 can be easily pulled out of the internal side 62a of the other house member 62, and due to the transparent material of the protecting envelope 20 the information carrier disc 10 can be seen, but the fastening unit 30 and the switching unit 40 exclude the possibility of the information carrier disc 10 being taken out of the protected area, that is the store.

. After customers have finally decided to buy an information carrier disc 10, they can take the container unit 50 and the information carrier disc 10 situated in the protecting envelope 20 to a salesperson. With a special opening tool the sales person can release the connection between the detent pin 33 and the breech-block 35 of the fastening unit 30. After releasing the fastening connection the detent pin 33 can be lifted out of the central hole 11 of the information carrier disc 10 and from the space 23 of the protecting envelope 20, and then through the passage 25 the information carrier disc 10 can also be pulled out of the space 23 of the protecting envelope 20.

Figure 3 shows a different construction of the protecting envelope 20. In this case too the protecting envelope 20 consists of a protecting plate 21, another protecting plate 22, a fastening unit 30 and a switching unit 40, with the difference that here the one protecting plate 21 and the other protecting plate 22 form two independent parts that can be taken apart. The one connecting strip - not shown in figure 3 - runs in the vicinity of the one bordering rim 21a of the one protecting plate 21, along a part of it, while the one bordering rim 21a has several free sections 21b avoided by the one connecting strip. The same stands for the other protecting plate 22, the other bordering rim 22a of which has other connecting strips 22c on a certain section with free sections 22b between them.

Here the one connecting strip and the other connecting strip 22c are constructed in a way that they co-operate with each other in a certain position of the one protecting plate 21 and the other protecting plate 22 with respect to each other, and so the one protecting plate 21 and the other protecting plate 22 cannot be separated from each other. In the present case the one connecting strips of the one protecting plate 21 can engage with the free sections 22b of the other protecting plate, while the other connecting strips 22c of the other protecting plate 22 can be fastened to the free sections 21b of the one protecting plate 21.

The one protecting plate 21 of the protecting envelope 20 contains base flap 21d extending over the information carrier disc 10 but covering it only partly, a holding wing 21e and a supporting wing 2 Ig. Here the base flap 21d is practically a plate the size of a quarter pie slice, with a shaped hole 21c in it. At the same time the other protecting plate 22 is bigger, because it has a part protecting the whole surface of the information carrier disc 10 and a part adjusting to the holding wing 2 Ie and supporting wing 21g of the one protecting plate 21. The other protecting plate 22 is also provided with a detent pint 33, which is situated on the other protecting plate 22 in a way that in the closed position of the protecting envelope 20 it can go right through the shaped hole 21c of the one protecting plate 21. In order to be able to remove the base flap 21d of the one protecting plate 21 from the other protecting plate 22 in the locked position of the protecting envelope 20, the detent pin 33 of the other protecting plate 22 is supplemented with claws 33a of a size and shape suiting the construction of the shaped hole 21c of the one protecting plate 21.

In the connected position of the one protecting plate 21 and the other protecting plate 22 - shown in figure 3 - there is a "t" distance larger than the "V" width of the information carrier disc 10 between the one protecting plate 21 and the other protecting plate 22, as a result of which a space 23 accommodating the information carrier disc 10 is created between the one protecting plate 21 and the other protecting plate 22 of the protecting envelope. There is a switching unit 40 in this space 23 attached to the internal surface 21f of the holding wing 21e of the one protecting plate 21. The fastening unit 30 is in the supporting wing 2Ig of the one protecting plate 21. The operation and construction of the fastening unit 30 is not relevant from the aspect of the invention, independently from its construction its task is to prevent the one protecting plate 21 and the other protecting plate 22 from being moved with respect to each other in the locked position of the protecting envelope 20.

Figures 4 and 5 show a possible construction of the goods protection device according to the invention, which is suitable for partly receiving the information carrier disc 10 with a central hole 11. It can be seen that the protecting envelope 20 is formed by a protecting plate 21, another protecting plate 22 and a free flap 24, which is the continuation of the one protecting plate 21. The one protecting plate 21 is partly surrounded by a bordering rim 21a, while the other protecting plate 22 is also partly surrounded by another bordering rim 22a. The one protecting plate 21 and the other protecting plate 22 are connected to form one single unit via a connection edge 20a running between the one bordering rim 21a and the other bordering rim 22a.

It must be pointed out here that the one protecting plate 21, the other protecting plate 22 and the connectiqn edge 20a can be made in one piece, e.g.: die-cast, but it can also consist of several pieces, which are fixed to each other in the last phase of producing the protecting envelope 20. However, producing the unit in one piece, practically from high- strength plastic, may be definitely favourable.

Figure 5 also shows that the unit consisting of the one protecting plate 21, the other protecting plate 22 and the connection edge 20a connecting the one protecting plate 21 and the other protecting plate 22 encases the space 23 in which a part of the information carrier disc 10 can be placed. In accordance with this the "t" distance of the space 23 between the one protecting plate 21 and the other protecting plate 22 - in the case of this construction - is only slightly bigger than the "V" width of the information carrier disc 10, but in the interest of achieving the aim the largest size of the "t" distance can be six times the "V" width.

Returning to figure 4 it can also be seen that on the part of the one protecting plate 21 free from the one bordering rim 21a there is a free section 21b, while on the part of the other protecting plate 22 free from the other bordering rim 22a there is a free section 22b. Free section 21b and free section 22b are situated opposite each other, and practically they determine the passage 25 ending in the space 23 of the protecting envelope 20.

The one locking piece 31 of the fastening unit 30 is fixed into the free flap 24 of the protecting envelope 20 - of the one protecting plate 21 starting from the passage 25 of the space 23 -, which locking piece 31 in the case of this construction has a neck 31a and detents 31c made in the neck 31a. The other locking piece 32 also belongs to the fastening unit 30, and it is provided with a head 32a and a shoulder 32c protruding from the head 32a.

The neck 31a of the one locking piece 31 is dimensioned so that it can be pushed through the central hole 11 of the information carrier disc 10, while the head 32a of the other locking piece 32 is practically bigger than the central hole 11 of the information carrier disc 10. The inside of the neck 31a of the one locking piece 31 is constructed in a way that the shoulder 32c of the other locking piece 32 can slide into it in order to fasten together the one locking piece 31 and the other locking piece 32 of the fastening unit 30 on the one part, and to dislodge the detents 31c of the one locking piece 31 on the other part.

It can be seen in figure 4 that the space 23 of the protecting envelope 20 is constructed in a way that beside a part of the information carrier disc 10 the switching unit 40 can also be placed in it, which in our case is provided with a passive oscillating circuit 41. The function of the switching unit 40 is to give a signal - co-operating with the central unit of the alarm system not shown in the figures -, if somebody wants to take away the information carrier disc 10 together with the protecting envelope 20 from the place of sales, without paying.

The goods protection device according to figures 4 and 5 is used according to the following. The information carrier disc 10 to be protected against theft is placed above the free flap 24 of the protecting envelope 20, while the free flap 24 is slightly bent so that a part of the information carrier disc 10 can be slid through the passage 25 into the space 23 bordered by the one protecting plate 21, the other protecting plate 22 and the connection edge 20a of the protecting envelope 20. When the central hole 11 of the information carrier disc 10 is above the neck 31a of the one locking piece 31 fixed into the free flap 24 of the protecting envelope 20 in a fix position, then as the free flap 24 is allowed back into its original, that is rest position, the neck 31a of the one locking piece 31 slides through the central hole 11 of the information carrier disc 10. In this position the information carrier disc 10 cannot be pulled back from the space 23 ofthe protecting envelope 20 in a straight line, along its own plane, as it is arrested by the neck 31a of the one locking piece 31.

After guiding the neck 31a of the one locking piece 31 through the central hole 11 of the information carrier disc 10, the shoulder 32c of the other locking piece 32 of the fastening unit 30 is pushed into the neck 31a of the one locking piece 31. As the shoulder 32c of the other locking piece 32 is going in the neck 31a of the one locking piece, it moves the detents 31c situated in the neck 3 Ia in a way that they are suitable for flexible deformation. The detents 31c open out, and in this position, protruding over the central hole 11 of the information carrier disc 10 they prevent the neck 31a of the one locking piece 31 from being pulled back through the central hole 11 of the information carrier disc 10.

When the shoulder part 32c of the other locking piece 32 is in its final position, the fastening unit 30 grabs it and does not allow it to be pulled back from the neck 31a of the one locking piece 31. When the other locking piece 32 is in this clamped position, the head 32a of the other locking piece 32 sits on the neck 31a of the one locking piece. In this way it protects the detents 31c protruding from the neck 31a of the one locking piece 31, and - as the head 32a of the other locking piece 32 is bigger than the central hole 11 of the information carrier disc - due to its own size it also prevents the information carrier disc 10 from being pulled off the one locking piece 31 of the fastening unit 30.

When the customer has paid for the information carrier disc, with a special tool the authorised person releases the connection between the one locking piece 31 and the other locking piece 32 of the fastening unit 30, and the shoulder 32c of the other locking piece 32 can be pulled out freely from the neck 31a of the one locking piece 31. In the course of this movement the head 32a of the other locking piece 32 moves away from the neck 31a of the one locking piece 31, and the detents 31c forced to go through flexible deformation also go back to their normal position making the way free through the central hole 11 of the information carrier disc 10. In this way, by bending again the free flap 24, the neck 31a of the one locking piece 31 can be pulled back from the central hole 11 of the information carrier disc 10, and the information carrier disc 10 can be taken out of the space 23.

Figure 6 shows another version of the goods protection unit. Here the protecting envelope 20 is basically the same as the one described above. As compared to the version described in connection with figure 4 the difference is in the construction of the fastening unit 30. In this case the one locking piece 31 placed in the free flap 24, which is the continuation of the one protecting plate 21 of the protecting envelope 20, has a relatively flat reception element 31b, while the other locking piece 32 is provided with a pin 32b protruding from the head 32a. The head 32a of the other locking piece 32 is bigger than the central hole 11 of the information carrier disc 10. The pin 32b is dimensioned so that it can go through the central hole 11 of the information carrier disc 10. At the same time the reception element 31b of the one locking piece 31 can take in the remaining part of the pin 32b of the other locking piece 32 pushed through the central hole 11 of the information carrier disc 10.

In the course of using the goods protection unit according to figure 6, the information carrier disc 10 can be pushed into the space 23 created between the one protecting plate 21 and the other protecting plate 22 of the protecting envelope 20 without any difficulty until the central hole 11 of the information carrier disc 10 is in a position right above the reception element 31b of the one locking piece 31. At this point by guiding the pin 32b of the other locking piece 32 of the fastening unit through the central hole 11 of the information carrier disc 10 it can be easily pushed into the reception element 31b of the one locking piece 31 of the fastening unit 30. In the reception element 31b the fastening unit 30 grabs the pin 32b and holds it until the connection between the one locking piece 31 and the other locking piece 32 is released with a special opening tool. At this point the pin 32b of the other locking piece 32 can be pulled out of the reception element 31b of the one locking piece 31, and the information carrier disc 10 can be taken out of the space 23 of the protecting envelope 20.

As compared to the constructions described above one of the differences in the goods protection device shown in figure 7 is that the one locking piece 31 fixed into the free flap 24 of the protecting envelope 20 has one single neck 31a, while the other locking piece 32 is provided with only one head 32a. The neck 31a can be pushed through the central hole 11 of the information carrier disc 10, and the part taken through the information carrier disc 10 is received by the head 32a of the other locking piece 32. Obviously in this case too the fastening unit 30 has a part, which keeps the neck 31a of the one locking piece 31 clamped in the head 32a of the other locking piece 32 as long as the information carrier disc 10 is situated in the space 23 of the protecting envelope 20.

Another difference as compared to the constructions described above is that the plane of the one protecting plate 21 of the protecting envelope 20 and the plane of the free flap 24 forming a continuation of the former plane are at 5° "α" angle with respect to each other. This construction may be favourable, because in the case that the free flap 24 is in this position, when the information carrier disc 10 inserted in the space 23, the free flap does not need to be bent out to make it possible for the information carrier disc 10 to slide in beside the neck 31a of the one locking piece 31 protruding from the free flap 24, as even in its normal position it makes it possible to slide in the information carrier disc freely, without any obstruction.

Obviously in the case of this version too, after a part of the information carrier disc 10 is slid into the space 23, the free flap 24 needs to be bent slightly towards the information carrier disc 10 to make the neck 31a of the one locking piece 31 go through the central hole 11 of the information carrier disc 10. Then the head 32a of the other locking piece 32 can be pulled onto the neck 31a, and by this the information carrier disc 10 can be attached to the protecting envelope 20 with the help of the one locking piece 31 and the other locking piece 32.

From the above examples it can be seen that the geometrical construction of the protecting envelope 20 and the construction of the one locking piece 31 and the other locking piece 32 of the fastening unit 30 can be realised in many different ways. However, it is important in each case that only a part of the information carrier disc 10 is taken in by the goods protection device, and the fastening unit 30 attaches the information carrier disc 10 only to one side of the protecting envelope 20, to the one protecting plate 21 in our case.

The goods protection device according to the invention can be used in every case when in the course of selling information carrier discs with a central hole direct display needs to be connected with efficient goods protection. List of references

0 information carrier disc 11 central hole 0 protecting envelope 20a connection edge 21 one protecting plate 21a one bordering rim 21b free section 21c shaped hole 21d base flap 21e holding wing 21f internal surface 21 g supporting wing 22 another protecting plate 22a other bordering rim 22b free sections 22c other connecting strips 23 space 24 free flap 25 passage 0 fastening unit 31 one locking piece 3Ia neck 31b reception element 31c detent 32 other locking piece 32a head 32b pin 32c shoulder 33 detent pin 33a claw 34 carrying tongue 35 breech-block 40 switching unit 41 passive oscillating circuit 50 container unit 60 house 61 house member 61a internal side 62 another house member 62a internal side 63 storage space 64 primary clamping unit 70 secondary clamping unit 71 neck 72 clamping extension 72a free end "t" distance "T" distance "v" width "V" width