The invention relates to an anti-theft box for displaying goods that are attractive by theft in shops and department stores, comprising a cassette having a lid which can be locked in closed position and can be unlocked only by means of a special tool, and an element on or in the anti-theft box for wireless activation of an alarm device if the anti-theft box is carried through the exit of the shop or the department store. The term "exit" then includes also the exit from a defined sales region in a department store or shop center.

Anti-theft boxes of this kind are used for displaying i.a. jewellery, watches and other small and expensive products and for displaying video-cassettes and video¬ games.

Specific demands are placed on an anti-theft box of the kind referred to above in order that such anti-theft boxes shall be used by the retail trade:

- the anti-theft box should not require too much space by having projecting portions because the display of the goods as a consequence thereof can be considerably more difficult since the anti-theft boxes in that case cannot be displayed in the shop on existing shelves or in existing racks without considerably enlarged space being required;

- it must be possible to produce the anti-theft box at reasonable costs so that the owner of the shop has not to bear too large costs in order to prevent theft of the displayed goods;

- the anti-theft box should not restrict the sale but should allow the customer to see unimpededly the goods enclosed in the box; - the anti-theft box should not be cumbersome to handle by the shop attendants but should be easy to

open at sale of the goods, preferably by using one hand only.

The purpose of the invention is to satisfy all these demands, and for this purpose the anti-theft box according to the invention has obtained the characterising features of claim 1.

The invention will be described in more detail with reference to the accompanying drawings which disclose an illustrative embodiment and wherein FIG. 1 is a side view of an anti-theft box with lock mechanism according to the invention, Fig. 2 is an end view of the box in FIG. 1, FIG. 3 is a plan view of the box in Fig. 1, Fig. 4 is an enlarged plan view of the lid of the box as seen from below,

Fig. 5 is a plan view of an operating slide,

FIG. 6 is a side view of the operating slide,

FIG. 7 is a plan view of a lock slide,

Fig. 8 is a fragmentary vertical cross sectional view of the upper portion of the box with the lid provided with operating slide and lock slide in a mounting position,

Fig. 9 is an horizontal cross-sectional view along line IX-IX in Fig. 8, Fig. 10 is a view corresponding to Fig. 8 with the lock slide in locking position,

Fig. 11 is a horizontal cross-sectional view along line XI-XI in Fig. 10, Fig. 12 is a fragmentary view of the lid as seen from below with the lock slide indicated in mounting position,

Fig. 13 is a view corresponding to Fig. 12 with the operating slide indicated in open position, Fig. 14 is a view corresponding to Fig. 12 with the operating slide indicated in closed position,

Fig. 15 is an enlarged fragmentary plan view of the lock slide,

Fig. 16 is an enlarged cross-sectional view of the lock slide, Fig. 17 is an enlarged cross-sectional view along line XVII-XVII of a guide pin on the lock slide with a portion of the lid provided for co-operation with said pin shown in side view,

Fig. 18 is a cross-sectional view along line XVIII- XVIII of a lock pin on the lock slide,

Fig. 19 is a vertical cross-sectional view partly a side view of a latch mechanism forming part of the lock, in engaged position,

Fig. 20 is a view corresponding to Fig. 19 but with the latch mechanism in disengaged position,

Fig. 21 is an enlarged view similar to Fig. 10 and discloses the latch mechanism in engaged position,

Fig. 22 is a fragmentary plan view of the operating slide and discloses the arrangement of the slide for co-operation with the latch mechanism,

Fig. 23 is a cross-sectional view along line XXIII-

XXIII in Fig. 22,

Fig. 24 is a cross-sectional view along line XXIV-

XXIV in Fig. 23, Fig. 25 is a fragmentary vertical cross-sectional view similar to Fig. 10 of the upper portion of the box in a modified embodiment having a lock slide only which is shown in engaged position, Fig. 26 is a horizontal cross-sectional view along line XXVI-XXVI in Fig. 25,

Fig. 27 is a fragmentary vertical cross-sectional view, partly a side view, of a latch mechanism forming part of the lock according to Figs. 25 and 26, in engaged position, and

Fig. 29 is a view corresponding to Fig, 27 but with the latch mechanism in disengaged position. In Figs. 1 to 3 there is disclosed an anti-theft box according to the invention which is preferably transparent and is made of rigid plastics. The box includes a cassette 10 for receiving the object or objects to be protected against theft and has a lid 11 which is pivotally mounted to the cassette by means of hinges 12. The interface between lid and cassette is inclined in order to reduce the build-up depth at stacking. The lid can be locked in closed position by means of a lock mechanism which is operated by displacing a lock slide 13 at a housing 14 provided on the lock slide, which is available exteriorly of the lid and encloses a lock or latch mechanism of the type described in WO 92/18734 and can be operated by means of a magnet. An element forming a dipole or a magnetic tape for wireless actuation of an electronic alarm system is provided on or in the anti-theft box in a manner known per se but not shown in detail herein. Elements of different types are known per se, and the object thereof is to disturb an electrostatic or electromagnetic field between two bows defining a passage in an exit of a shop or department store, when carried through said field, an alarm device as a consequence thereof being activated via electronic circuits. This is an anti-theft technique known per se. The lock mechanism is mounted in the lid 11 and will be described in more detail with reference to Figs. 4 to 18.

The operating slide 13 shown in Figs. 5 and 6 comprises an elongated flat slide to which the housing for the latch mechanism is attached; said housing can also be integral with the operating slide. The operating slide is constructed for co-operation with a lock slide, Fig. 7, which also comprises an elongated flat slide having a number of lock bolts 16 with round cross section and projecting from one longitudinal edge, and an equal number

of guide bolts 17 with round cross section and projecting from the other longitudinal edge said lock and guide bolts being co-axial with each other. It is not necessary that the number of guide bolts is the same as the number of lock bolts or that the bolts are coaxial though this is the case in the embodiment described. Four oblique guide slots 18 are provided in the lock slide, and the operating slide 13 which shall lay on top of the lock slide 15 when the slides are mounted in the lid 11, has on the lower side thereof four from said side perpendiculary projecting coupling pins 19 for engagement with the guide slots 18.

Mounting of the slides with the operating slide 13 laying flat on top of the lock slide 15 in a predetermined displaced position which will be termed mounting position takes place from the lower side of the lid the housing 14 being passed upwards through a rectangular opening 20, Figs. 3 and 4, in the lid 11. At the opposite longitudinal edges of this opening here are two shoulders 21 and 22 mutually spaced in the longitudinal direction of the opening, and on the outside of the housing 14 two pairs of ribs 23 and 24 are provided extending in the longitudinal direction of the operating slide and having the same length as the shoulders 21 and 22. Between the ribs 23 and 24 there is provided at each side of the housing 14 a projecting rib 25 which also extends in the longitudinal direction of the operating slide 13 in the same plane as the operating slide and has the same thickness as said slide and in fact is formed by a portion of the operating slide. The ribs 23 and 24 are displaced in the transverse direction of the slide in relation to the ribs 25 as can be clearly seen from Fig. 6. Between the shoulders 21 and the shoulders 22, respectively, the opening 20 has a width which corresponds to the width of the housing 14, while the slot between the shoulders 21 and one end edge of the slot has a portion 25 the width of which corresponds to the

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slots 18 according to Fig. 15. By this displacement of the operating slide 13 and the pins 19, the lock slide 15 is displaced slightly to the right as seen in Figs. 8 and 9 so that the lock bolts 16 will penetrate into the apertures 31 but not into the apertures 33. There is thus effected a plane parallel displacement of the slides engaging each other in mutual perpendicular directions. The housing 14 is now in the position indicated in Fig. 13 the operating slide 13 being displaceably retained in the lid 11 by the shoulders 21 and 22 being partly received between the ribs 23 and 24, respectively, and the ribs 25. The lock bolts 16 and the guide bolts 17 are displaceably received in the apertures 31 and the apertures 29, respectively, the plane portion 30 being displaced laterally in relation to the web 28 so that the guide bolts 17 cannot again pass through the narrow portion of the apertures 29. The slides are now in a position which may be termed the open position because the lock bolts 16 do not prevent the lid 11 from being swung upwards. In order to lock the lid 11 in the closed position the operating slide 13 is displaced to the position according to Fig. 14 the pins 19 as a consequence thereof being displaced in the slots 18 to the position shown in Fig. 11 and the lock slide 15 being displaced to the right as seen in Fig. 9 so that the lock bolts 16 are passed through the aperture 33 in the upper edge of the cassette 10 and into the aperture 34 in the lid 11. The locked position is shown in Figs. 10 and 11. In this position the pins 19 are received in a portion 18' of the slots 18, which extends in the longitudinal direction of the lock slide 15. This makes it difficult to press the lock bolts 16 back if one tries to open the anti-theft box in this manner.

It is of course necessary to latch the lock slide 15 in the locking position, and for this purpose there is in

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outside thereof as described in WO 92/18734. When the flap 37 has been withdrawn from the hole 39 the operating slide can be displaced to the open position with the flap sliding at the end edge thereof on top of the lock slide which is displaced in the transverse direction thereof to the left as seen in Fig. 11 for withdrawal of the lock bolts 16 from the apertures 34 and 33 but not from the aperture 31. For this to happen continued displacement of the operating slide 13 and the lock slide 15 is required which is prevented by the tongues 27, Fig. 15.

When the flap 37 after having been raised from the hole 39 by means of the magnet slides on the lock slide 15 it will be received by a depression 41 having a bottom sloping in the transverse direction as well as the longitudinal direction of the operating slide as seen in Figs. 22 - 24. Since the spring blade 36 moves together with the operating slide 13 when this is displaced in the longitudinal direction thereof, and the lock slide 15 moves in relation to the spring blade 35 in the transverse direction thereof the depression 41 can have irregular shape as shown in Figs. 22 but it can also be rectangular. Sliding of the spring blade against the lock slide 15 is facilitated by the edge portion 37' angled laterally, which engages the lock slide. By the flap 37 engaging the depression 41 the lock slide will be maintained in the open position but can easily be brought to the locking position when locking shall take place again, the operating slide 13 being displaced to the position in Fig. 11 with the spring blade sliding on top of the lock slide 15 in the depression 41 and being successively raised from said depression by the sloping bottom in order to finally snap into the hole 39 under its own spring bias.

Another latch mechanism than that shown herein can be provided, and it is also conceivable to arrange the latch mechanism on the lid 11 for engagement with the operating

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then may be more complicated because welding or screwing must take place.