Anti-theft device for an item in a bag or blister pack

Abstract

The present invention relates to an anti-theft device comprising a detection means and a magnetic locking means, a movable jaw (2) and a stationary jaw (3) extending a body (4), each provided with an inner contact surface (20, 30), and the movable jaw (2) being hingedly connected to the stationary jaw (30) so as to engage by clamping at their respective contact surface (20, 30), characterised in that at least one of the jaws (2, 3) is provided with a metal sheet (1) having perforated micro-bosses, with a height of between 0.3×E and 0.8×E, E denoting the thickness of the metal sheet (1), which is between 0.1 and 0.3 millimetres, the micro-bosses forming a matrix with a gap between two neighbouring micro-bosses of between 0.4 and 0.7 millimetres

Description

DESCRIPTION TITLE: Anti-theft device for articles in bags or blister packs Field of invention

[0001] The present invention relates to the field of electronic anti-theft devices for protecting self-service items in stores using electromagnetic interaction between an element inserted into the body of the anti-theft device and a detection gate positioned at a critical checkout exit to trigger an alarm when the anti-theft device passes nearby. These anti-theft devices use a locking system that can be magnetically deactivated by an authorized operator.

[0002] The invention relates more particularly to such articles for the protection of articles packaged in flexible bags, or thermoformed packaging (in English "blister") or fixed on a cardboard box. These articles are difficult to secure with traditional anti-theft devices because they do not allow piercing by a needle, as proposed by anti-theft devices for textile articles, and do not have protruding parts and hollows, which prevents the use of anti-theft devices intended for example for the protection of bottles or cosmetic articles.

[0003] The solution is to pinch the film of the item between two jaws, so as to make it difficult to separate the lock from the item. State of the art

[0004] To this end, a solution is known, described in patent application US7808386, proposing an anti-theft device formed of two parts, hinged relative to each other and each having a pinching contact surface with the article to be protected. Each contact surface has a plastic coating to prevent damage to the article, and is preferably provided with raised means of the texturing type, or else teeth which cooperate by mutual engagement when the two contact surfaces are pressed against each other, and which are elastically deformable when they are pressed against the article. These elastically deformable surfaces do not allow sufficient holding of an article such as a thin bag, in the locked position.

[0005] French patent FR3075844 is also known concerning an electronic anti-theft device which comprises electronic detection means, a first part and a second part, each provided with a so-called contact surface, and the first part being movable by means of a hinge relative to the second part so as to cooperate by pinching at their contact surface, the anti-theft device being characterized in that at least one of the parts, preferably both parts, comprise on their contact surface an abrasive coating in the form of a support carrying abrasive grains. The abrasive coating is intended to be in direct contact with the object to be pinched.

[0006] Also known is US5647106, a theft deterrent system consisting of a clamp for attachment to a small object such as a wallet, checkbook, or paperback book, and a spreading tool for attaching the clamp to and removing it from the object. The clamp is generally U-shaped and has two clamping arms with a relatively large pressing force between them. Padding is provided on the inner surfaces of the clamping arms. At least one of the clamping arms is provided with teeth which, when the clamp is attached to the object, will indent the surface of the object if an attempt is made to slide the clamp relative to the object. The spreading tool opens the clamping arms against the biasing force to allow the clamp to be attached to or removed from the object. The preferred tool is equipped with springs which tend to hold the jaws in a nearly closed equilibrium position.

[0007] Patent application US2007 / 283729 relates to a security tag holder for removably attaching to a garment. The holder comprises first and second members coupled for relative pivotal movement about a pivot axis. The first member comprises clamping and locking regions on opposite sides of the axis, respectively. The second member comprises a second clamping and locking region on opposite sides of the pin. The first locking region comprises a recess and a fixed magnet. The second locking region comprises a bore and a movable magnet that is movable between an unlocked position in which the movable magnet is received in the bore and a locked position in which the movable magnet is partially inserted into the recess and attracted by the fixed magnet.When the first and second elements are pressed against each other to tighten the garment, the movable magnet moves from its unlocked position to its. locking position to lock the first and second members against any relative pivoting movement. Disadvantages of the prior art

[0008] The solution proposed by patent FR3075844 is not satisfactory because in reality, in practice, the abrasive coating does not prevent the removal of an item such as a flexible bag or a cardboard box at all. This patent states that it would be "surprising" if an abrasive-coated surface ensured optimal wedging of an object, but in reality, this wedging is ineffective and far from optimal for preventing the removal of the object. Indeed, the thicknesses of the items vary from one product to another, and it is not possible to find a configuration adapted to different thicknesses and types of packaging. The tolerances are provided for the possibility of adaptation to different types of thickness. The technical choice of rotating the two bodies by a hinge causes a major defect in the angular positioning of the abrasive surfaces when they come into contact with the product to be secured.The jamming is insufficient to prevent removal by simply pulling the item in the direction parallel to the planes of the abrasive surfaces. If the tolerance is reduced, some thin items will slip out directly without any hold, and thick items will prevent the jaws from closing. In addition, the hard grains of the abrasive coating mark the plastic material and cause very damaging breakage incipients when it comes to vacuum bags. Finally, abrasive materials formed by a support carrying abrasive grains use bonds and grains of material generally incompatible with food use. Solution provided by the invention In order to overcome these drawbacks, the present invention relates to an anti-theft device intended for the protection of articles in plastic film or blister packs having the characteristics set out in claim 1. The anti-theft device comprises a detection means and a magnetic locking means, a movable jaw and a fixed jaw, each provided with an internal contact surface, and said movable jaw being articulated relative to said fixed jaw so as to cooperate by pinching at their respective contact surface. The bringing the two jaws together, perpendicular to their contact surfaces, allows for optimal pressure to be applied to the surfaces of the embossed metal plates positioned on the jaws. At least one of said jaws, and advantageously both jaws, is, according to a preferred variant, provided with a metal sheet (1) having perforated micro-embossments, with a height of between 0.3xE and 0.8xE, E designating the thickness of said metal sheet of between 0.1 and 0.3 millimeters, said micro-embossments forming a matrix with a gap between two neighboring micro-embossments of between 0.4 and 0.7 millimeters. Advantageously, said movable jaw and said fixed jaw are each provided with a metal sheet having perforated micro-bumps. Preferably, said movable jaw cooperates with a pivoting lever articulated relative to the fixed jaw by an axis and relative to said movable jaw by an off-center axis interacting with a light. This lever allows you to increase the tightening force exerted by the user when installing the anti-theft device. The metal sheets with micro-dentations meet food standards for 304L stainless steel (commonly used for kitchen accessories due to its high resistance to corrosion). According to a variant, said body is crossed by a light. Said lever (5) has a light opening into said light of the body when the lever is in the locked position. According to a variant: a) Said contact surfaces are movable relative to each other in a transverse direction between a first position and a second position b) each of said contact surfaces has complementary profiles formed by an alternation of projecting zones and hollow zones c) said profiles being configured such that, when said jaws are in the clamping position, a. the tops of the projecting zones of said contact surfaces are in contact when they are positioned in said first position b. the tops of the projecting zones of said contact surfaces are in contact with the bottom of the hollow zones when they are positioned in said second position. Advantageously: said contact surfaces are movable according to said first position and said second position by a transverse sliding. said fixed and movable jaws are articulated relative to a pivot axis between: a) a locking position where the two contact surfaces (20, 30) are brought together and locked by the magnetic locking means until it is deactivated, b) an insertion position where the two contact surfaces (20, 30) are separated. said complementary profiles have teeth forming the projecting zones spaced with a constant pitch by grooves forming the hollow zones. the width of said teeth is less than the width of said grooves. Detailed description of a non-limiting example of embodiment The present invention will be better understood on reading the following description, concerning a non-limiting example of embodiment illustrated by the appended drawings where: [FIG. 1] Figure 1 represents a perspective view of the anti-theft device according to the invention in the unlocked position. [FIG. 2] Figure 2 shows a sectional view of the anti-theft device according to the invention in the locked position [FIG. 3] Figure 3 shows a cross-sectional view of the front part of the anti-theft device according to the invention unlocked [FIG. 3A] Figure 3A shows a cross-sectional view of the front part of the anti-theft device according to the invention unlocked [FIG. 3B] Figure 3B shows a cross-sectional view of the front part of the anti-theft device according to the invention locked [FIG. 4] Figure 4 represents a partial sectional view of the anti-theft device according to the invention [FIG. 5] Figure 5 represents a perspective view of the anti-theft device according to the invention attached to an article to be protected [FIG. 6] Figure 6 represents a perspective view of a variant of the anti-theft device according to the invention in the unlocked position [FIG. 7] Figure 7 represents a perspective view of a variant of the anti-theft device according to the invention in the locked position [FIG. 8] Figure 8 shows a cross-sectional view of the front part of a variant of the anti-theft device according to the invention locked in a second position [FIG. 9] Figure 9 represents a perspective view of the first part of a variant of the anti-theft device according to the invention [FIG. 10] Figure 10 shows a perspective view of the second part of a variant of the anti-theft device according to the invention [FIG. 11] Figure 11 shows a partial sectional view of a variant of the anti-theft device according to the invention in the unlocked position [FIG. 12] Figure 12 shows a partial sectional view of a variant of the anti-theft device according to the invention in the locked position [FIG. 13] Figure 13 shows a perspective view, three-quarter front, of another variant of the anti-theft device according to the invention in the unlocked position [FIG. 14] Figure 14 shows a side view of this variant of the anti-theft device according to the invention in the unlocked position. [FIG. 15] Figure 15 shows a detailed view of this variant of the anti-theft device according to the invention in the locked position [FIG. 16] Figure 16 shows a perspective view of another variant of the anti-theft device according to the invention in the locked position [FIG. 16a] Figure 16a shows a partial sectional view of a variant of the anti-theft device according to the invention in the open position [FIG. 17] Figure 17 shows a perspective view of another variant of the anti-theft device with a hooking hoop according to the invention in the locked position [FIG. 18] Figure 18 shows a partial sectional view of an alternative of this variant of the anti-theft device according to the invention with a hooking hoop in the locked position [FIG. 19] Figure 19 represents a perspective view of a variant of the anti-theft device equipped with a sensor according to the invention in the open position [FIG. 20] Figure 20 shows a perspective view of a variant of the anti-theft device according to the invention in the open position [FIG. 21] Figure 21 shows a perspective view of a variant of the anti-theft device according to the invention in the partially closed position. [FIG. 22] Figure 22 shows a perspective view of a variant of the anti-theft device according to the invention in the locked position [FIG. 23] Figure 23 shows a perspective view of a microperforated metal sheet for an anti-theft device according to the invention in the locked position [FIG. 24] Figure 24 shows a perspective view of a jaw of a variant of the anti-theft device according to the invention in the locked position [FIG. 25] Figure 25 represents a perspective view of a variant of the anti-theft device according to the invention in the open position [FIG. 26] Figure 26 shows a perspective view of a secure article with a variant of the anti-theft device according to the invention in the locked position [FIG. 27] Figure 27 shows a perspective view of a variant of the anti-theft device according to the invention in the open position [FIG. 28] Figure 28 shows a perspective view of a variant of the anti-theft device according to the invention in the locked position [FIG. 29] Figure 29 shows a perspective view of a variant of the anti-theft device according to the invention in the locked position for attachment to a rod [FIG. 30] Figure 30 shows a perspective view of a variant of the anti-theft device according to the invention in the open position [FIG. 31] Figure 31 shows a three-quarter front perspective view of a variant of the anti-theft device according to the invention in the locked position [FIG. 32] Figure 32 shows a three-quarter rear perspective view of a variant of the anti-theft device according to the invention in the locked position Principle of the invention

[0009] The invention relates to the protection against theft of articles packaged in blister packs, bags or fixed to cardboard, in particular foodstuffs which require the use of specific anti-theft devices which do not pierce the packaging, in particular when it is vacuum-packed, in order to guarantee its airtightness and which are compatible with food products, without polluting it with particles detaching from an abrasive surface. due to humidity and / or deterioration / disintegration of the support holding the abrasive grains.

[0010] For this, the invention provides for providing at least one of the jaws (2, 3) which clamps the article with a metal sheet (1) having perforated micro-embossments, with a height of between 0.3xE and 0.8xE, E designating the thickness of said metal sheet (1), of between 0.1 and 0.3 millimeters, said micro-embossments forming a matrix with a gap between two neighboring micro-embossments of between 0.4 and 0.7 millimeters.

[0011] These open micro-bumps have a height of the same order of magnitude, and a little less than the thickness of a plastic film. They superficially punch the film according to the network of micro-bumps formed on the surface of the metal sheet (1). These bumps have a truncated cone shape, with lips surrounding the perforation extending substantially cylindrically, in a direction perpendicular to the film inserted between the jaws to retain it in the event of traction in a direction in the plane of the jaw.

[0012] Such a sheet metal with perforated micro-bumps is used, for example, for the production of callus rasps. The sheets typically have a thickness of 200 micrometers, with a matrix of perforated micro-bumps of truncated cone shape formed on the surface of the sheet metal, for example by stamping, with a height of approximately 100 micrometers. The bottom of these micro-bumps is pierced either due to tearing during deformation of the sheet metal, or by laser drilling or other means.

[0013] The perforated micro-bumps form a matrix, regular or random. The centers of two neighboring perforated micro-bumps are less than a millimeter apart, typically 400 to 700 micrometers.

[0014] The sheet is preferably an austenitic stainless steel sheet, typically a 304 steel.

[0015] The jaw may be provided with a single sheet covering most of the contact surface, or may be made of strips fixed to the contact surface of the jaw.

[0016] This solution, which is the subject of the present invention, concerning the use of a rot-proof metal sheet (1), makes it possible to provide roughness without adding grain but by deformation of the metal. This way of producing roughness makes this part extremely wear-resistant and avoids the problems of the solution proposed by patent FR3075844, regarding the use of a woven support with the addition of abrasive grain, a support which, in a humid environment, has a limited lifespan. The fabric will disintegrate with problematic grain retention, especially in the presence of food products. First variant of implementation

[0017] A first variant embodiment is illustrated by Figures 1 to 5. A second variant embodiment is illustrated by Figures 6 to 10. The two variants differ mainly in that in the second variant, one of the jaws is transversely movable to allow passage between a first spacing of the jaws in the locked position, to a second spacing of the jaws in the locked position, with the same device, so as to allow adaptation to the film thickness of the article to be protected. Description of the embodiment variant with reference to Figure 4

[0018] The anti-theft device will be described in the following according to a non-limiting example of embodiment of the invention with reference to figure 4. It consists of two articulated parts, namely a movable jaw (2) actuated by means of a lever (5) a fixed jaw (3) extending a body (4) made of ABS plastic and polycarbonate.

[0019] The article to be protected, for example a bag or the cardboard sheet of a blister pack, is introduced between the two jaws (2, 3). The movable jaw (2) is brought closer to the fixed jaw (3) by tilting the lever (5) which is then locked in the folded position by a magnetic system provided in the tail (31) of the body (4). To prevent the article from separating from the anti-theft device, the jaws (2, 3) are treated by the affixing of a metal sheet (1) having perforated micro-bumps to prevent the article from moving in the median plane, even when an unscrupulous individual attempts to tear the article off to remove it from the anti-theft device.

[0020] This body (4) also integrates a means of electromagnetic interaction with a detection portal, for example a tuned coil or a ferrite (39).

[0021] The locking means of the end (5) of the lever (5) comprises a movable weight (36) pushed back to rest by a spring (37) in a position where its end is pushed back against the notched segment (6) provided at the end of the lever (5) for actuating the movable jaw (2) (see Fig. 3). When a magnetic unlocker is approached to the tail (31), the weight (36) is attracted towards the magnet it contains, and releases the locking nose (21), which releases the tilting of the lever (5) and allows the movable jaw (2) to be opened (Fig. 3).

[0022] The lever (5) is articulated relative to the fixed jaw (3) by a transverse axis (8). It causes the longitudinal displacement of the movable jaw (2) by a cam and an eccentric axis (9) moving in a slot (12) provided in a wall of the movable jaw (2) (Fig. 3).

[0023] The body (4) is crossed by an oblong light (13) which extends, when the lever (5) is in the folded position, by an oblong light (14) crossing said lever (5).

[0024] These two lights allow the passage of a pin from a display stand, to hang the item on a pin display stand. The oblong shape allows the lever (5) to be activated if necessary when a pin passes through it. They also allow the passage of an alarm cable through all the anti-theft devices protecting items for security during the night, for example. Description of an alternative embodiment with reference to figures 6 to 10

[0025] According to this embodiment variant, illustrated by figures 6 to 10, the movable jaw (2) can be shifted laterally to adapt to the thickness of the article to be protected with a single device. The gap between the two contact surfaces of the movable jaw and the fixed jaw, in the closed position, can be adjusted between a minimum gap and a maximum gap, by a lateral displacement of the movable jaw (2). The surfaces of the grooves of the fixed jaw (3) and / or the movable jaw (2) are coated with a sheet metal having perforated micro protuberances.

[0026] The movement of this part makes it possible to match different contact levels during the transmission of movement actuating the descent of the movable jaw (2).

[0027] This allows in the locked position to move from a functional clearance of the first position to a functional clearance of the second position, thus limiting the pressure exerted on the locking point.

[0028] According to this embodiment, the fixed jaw (3) has a striated contact surface (30), with alternating rectilinear teeth (33) and grooves (34) to form a network with a constant pitch. The fixed jaw (3) incorporates a means of electromagnetic interaction with a detection gantry, for example a tuned coil or a ferrite (39), and a magnetic unlocking system in a tail (31). This unlocking means comprises, in a known manner, a movable weight (36) pushed back to rest by a spring (37) in a position where its end engages in a hole (22) provided in a locking nose (21) provided on the movable jaw (20). When a magnetic unlocker is brought close to the tail (31), the weight (36) is attracted towards the magnet it contains, and releases the locking nose (21), which allows the movable jaw (2) to be opened.

[0029] The movable jaw (2) has a movable part (25) a striated contact surface (30), with an alternation of rectilinear teeth (23) and grooves (24) to form a network with a constant pitch identical to the pitch of the contact surface (30).

[0030] In Figure 7, the movable part (25) occupies a first position where the tops of the rectilinear teeth (23) of the movable jaw (2) come into contact with the tops of the rectilinear teeth (33) of the movable jaw (3). In this position, the jaws (2, 3) can retain a thin film, for example a food bag, by pinching it between the tops of the rectilinear teeth (23, 33) which are aligned in this first position.

[0031] In Figure 8, the movable part (25) occupies a second position, offset transversely with respect to the first position, and the tops of the rectilinear teeth (23) of the movable jaw (2) engage in the rectilinear grooves (34) of the fixed jaw (3), and the tops of the rectilinear grooves (24) of the movable jaw (2) engage in the rectilinear grooves (33) of the fixed jaw (3),

[0032] The width of the teeth (23, 33) is slightly less than the width of the grooves (24, 34), so that when the jaws (2, 3) are closed on a surface of a blister or a cardboard, they clamp it by forcing it to match the profile of the contact surfaces (20, 30).

[0033] The movable part (25) can be moved laterally by sliding on a transverse axis (26). An elastic tongue (27) having one end forming a stop ensures the indexing of the two positions, by interacting with a notch (28) provided on the jaw (2). The teeth (23) of the movable part (25) have a curved shape for promote good positioning when pivoting the movable jaw (2) relative to the transverse rotation axis (10). Alternative embodiment ([FIG.13] to [FIG. 15])

[0034] Some rigid blisters (51) have a thermoformed edge (52). This edge (52) limits the capacity of the packaging (51) to be inserted between the jaws (2, 3), thus limiting the holding power of the anti-theft device on the product. To overcome this defect, a plastic lip (50) is integrated into the lower fixed jaw (3). (or into the fixed jaw (2)). This lip (50) when closing the anti-theft device will come to be placed behind the vertical edge (52) thus blocking any movement towards the rear during an attempt to tear off the product. For this purpose, the anti-theft device according to this variant has for one of the jaws (the movable jaw (2) or the fixed jaw (3)) an extension by a transverse lip (50), in front of their contact surface (1) of the jaws (20, 30). This lip (50) extends parallel to the front surface (55) of the opposite jaw in the locked position. Variant suitable for an angular item

[0035] Figures [FIG. 16] and [FIG. 16a] illustrate a variant where the movable jaw (3) has a wedging zone (60), delimited for example by two flanks (61, 62) ensuring the blocking of the introduction of an article having a triangular rear face. The fixed jaw (2) has slots allowing the passage of the flanks (61, 62).

[0036] This variant allows the anti-theft device to be placed in the corner of the product to be protected in order to enter the pianogram as little as possible, that is to say the drawing or schematic plan used to place the goods in order to maximize sales. It can be a diagram or a model indicating the placement of the products on the shelves or the layout of the entire store.) so that the maximum number of products are positioned in the store furniture. Hook variant

[0037] In order to provide a method of presenting the articles by hanging them on a rod or support, a variant of the device consists of equipping the body of the anti-theft device with a pin (70), preferably retractable by tilting and pivoting around an axis. transverse, as shown in figure [FIG. 17] or by translation as shown in figure [FIG. 18], This pin (70) is formed for example by a metal rod folded to form a “U” loop. Variant with electronic alarm

[0038] Figure [FIG. 19] shows another variant, compatible with all previous and following variants, where the fixed contact surface (30) has a slot (80) for the passage of a feeler, formed by a stud (81) actuating an electrical contact. When the jaws (2, 3) are brought together and the contact surfaces (20, 30) are pressed on an article, the feeler (81) is pushed back into the retracted position, which leads the electrical contact to a first state. If a malicious person attempts to force the anti-theft device by spreading the jaws with a tool, for example a screwdriver, the feeler (81) is pushed back into erection by a spring, which leads the electrical contact to a second state. When the anti-theft device is equipped with a radio communication module, the change of state makes it possible to send a signal to a monitoring center.This signal can be coded with an identification sequence of the anti-theft device that is the subject of an attempted break-in.

[0039] This variant provides an additional level of security by activating an alert when an attempt is made to pry the jaws of the anti-theft product apart using a tool to pull the product from the jaws. The alarm is triggered by an electronic module housed in the body of the device, in the event of an attempted break-in resulting in the product being pulled apart or an attempt to pry the jaws apart triggering the detector.

[0040] In figure [FIG. 19], a variant of the contact surface (30) is also shown, not specific to the probe variant. The contact surface (30) has slightly raised zones (82 to 85), less than one millimeter, advantageously deformable by crushing, to improve the holding of a thin article pinched between the two contact zones (20, 30). Variant with lever lock button

[0041] The variant illustrated by figures [FIG. 20]; [FIG. 21], [FIG.22] concerns another improved variant to increase the resistance to forced unlocking by application of an impact. The weight ensuring the locking is engaged in a cavity of the lever (5) by the force applied by a spring; unlocking occurs when an opposing force is applied by bringing a correctly positioned magnet closer. However, by applying a violent impact, the kinetic energy of the weight, under the effect of the acceleration resulting from the impact, can lead to the same unlocking effect. The variant consists of providing a lever (50) having a button (90) formed at the end of a pivoting elbow piece.

[0042] When the anti-theft device is in the standby position, illustrated by figure [FIG. 20], the lever (5) is in the raised position, and the lever locking button (90) is in the pushed position towards the weight (36) under the effect of spring pressure.

[0043] When rotating the lever (5) (figure [FIG. 21]), pressure must be exerted at the same time on the button (90) in order to tilt it backwards, i.e. in the opposite direction to the weight (36).

[0044] The continuation of the stroke of the lever (5) causes the counterweight (36) to move back due to the sliding of the rear nose (95) on the inclined surface (96) of the counterweight (36). The pressure on the button (90) has made it possible to free up a space to receive the end of the lever (5). When the lever (5) reaches the low position, the counterweight (36) is opposite a slot (97) provided on the lever (5). The counterweight (36) is then pushed to engage in this slot (97) under the pressure of its spring (37).

[0045] As shown in figure [FIG. 22], the user releases the pressure exerted on the lever (5) and the locking button (90). The lever (50) rises under the effect of its springs and the tooth of the lever and the weight (36) come to lock. The locking button (90) moves forward under the effect of its spring, and comes to be placed under the lever (5). In this position the lever (5) can no longer move downwards without exerting pressure on the button (90), in order to remove the vertical locking point. This jaw locking lever (2, 3) interacts with the button placed opposite the lever (5), requiring simultaneous pressure on these two elements to obtain the release of the weight ensuring the locking of the jaws (2, 3).According to this variant, the device comprises a locking lever (50) for the jaws (2, 3) having a button (90) formed at the end of a pivoting elbow piece, said locking lever (50) interacting with the lever (5) to lock it in the locking position of the anti-theft device. Contact surface variant with retaining lip

[0046] According to the variant illustrated by the figure [FIG. 23], the contact surfaces (20, 30) are formed by metal sheets having perforated micro-bumps folded to present a stop (29) perpendicular to the contact surface (20, 30). This stop (29) is inserted in a housing present in the fixed jaw (3) and in the movable jaw (2) to neutralize the sliding of the plates when securing thick products.

[0047] In fact, a forward sliding effect / force of the retaining plates appears due to the strong pressure exerted by the jaws on the protected product. In this example, the micro-dented sheet (20) has slightly raised disc-shaped, deformable areas (82 to 86) to improve the holding of thick articles. Application of the anti-theft device according to the invention

[0048] The invention is of great interest both for the protection of food products (due to its design and the hygienic standards related to metal blades) and for non-food items. It is suitable for different blister materials (plastic, cardboard, bags, textiles, among others) as well as for strapping.

[0049] the lever (5) is provided with teeth (100 to 104) split to present a deformable blade (110 to 114) with an arrangement of pressure walls ensuring cushioning of the pressure exerted by the lever on the movable jaw in the event of introduction of a thick product. Variant with split teeth

[0050] According to the variant illustrated in figures [FIG. 24] and [FIG. 25], the lever (5) is provided with teeth (100 to 104) split to present a deformable blade (110 to 114) with an arrangement of the pressure walls ensuring damping of the pressure exerted by the lever on the movable jaw in the event of introduction of a very thick product.

[0051] When applying pressure to the jaws on a very thick product,

[0052] high stresses are transmitted by the lever to the structure supporting it. In order to limit these stresses, the 4 pressure walls have been designed to allow a reduction in the force by deformation of the pressure walls.

[0053] The geometry of this arrangement allows the pressure walls to guarantee maximum pressure in the locked position without deformation. Strap protection system for an item

[0054] Figure [FIG. 26] illustrates an alternative application of the invention. The protection is ensured by a system formed by straps (120, 121) and a jaw lock according to the invention (122). The metal sheets (1) having perforated micro-bumps which are provided on the jaws (2, 3) ensure the locking of the straps (120, 121).

[0055] The strapping straps (120, 121) are wrapped around a product, for example presented in a cardboard box. The jaw lock according to the invention (122) is introduced under the strapping straps (120, 121) thanks to the beveled front edge (123) of the fixed jaw (3), facilitating positioning under the strapping straps.

[0056] The lower jaw (3) is equipped with sensors for detecting the pressure exerted by the strapping band on said sensors when locking the device (122).

[0057] If a thief attempts to cut the strapping band or tear the anti-theft device (122) off the strapping band, the pressure of the band is released and the sensors are disabled.

[0058] Disabling the sensors triggers an alarm. Adjustable alarm cable strap protection system

[0059] Figures [FIG. 27] [FIG. 28] illustrate, respectively, in the open and locked position another variant for locking an adjustable alarm cable (130). In this variant, the element to be retained is a steel cable (130), which is sheathed in plastic.

[0060] This cable (130) is an integral part of the device. It is intended to enclose any product in stock. One end of the cable (132) is mechanically held to the main plastic body of the anti-theft device which is connected to the electronic circuit.

[0061] The other end (133) of this cable is free to slide inside the body of the device in order to allow adjustment of the length of the loop around the object to be protected. To secure the loop at the desired length, simply lower the lever so that the jaws equipped with the metal retaining plates come under pressure against the cable.

[0062] In this position, the cable (130) can no longer slide and the object inserted into the loop can no longer be removed. In the event of an attempted break-in by cutting the cable, an alarm is triggered. Similarly, any separation of the jaws triggers an alarm. Variant for rod display

[0063] Figures [FIG. 29] to [FIG. 32] illustrate an alternative embodiment for articles presented on a rod (140). The lever (5) is provided with a sleeve (145), advantageously having a blade interacting with the rod (140) to prevent the grouped removal of several devices. This interaction device is for example in accordance with that described in patent US12053107B2.

[0064] The rod (140) is intended to retain articles attached to the anti-theft device (122). The rod (140) is constituted by a smooth rod of section less than or equal to the section of the hole passing through the sleeve (145) and has a notched or threaded free end section (146).

[0065] The sleeve (145) has a lumen with a section complementary to that of the rod and greater than the section of said notched free end (146), and comprises at least one tooth disengageable by an external actuating means to interact at rest with said notching or threading.

Claims

Claims 1 - Anti-theft device comprising a detection means and a magnetic locking means, a movable jaw (2) and a fixed jaw (3) extending a body (4), each provided with an internal contact surface (20, 30), and said movable jaw (2) being articulated relative to said fixed jaw (30) so as to cooperate by pinching at their respective contact surface (20, 30), characterized in that at least one of said jaws (2, 3) is provided with a metal sheet (1) having perforated micro-embossments. 2 - Anti-theft device according to claim 1 characterized in that said micro-bumps have a height of between 0.3xE and 0.8xE, E designating the thickness of said metal sheet (1), of between 0.1 and 0.3 millimeters. 3 - Anti-theft device according to claim 1 or 2 characterized in that said micro-embossments form a matrix with a gap between two neighboring micro-embossments of between 0.4 and 0.7 millimeters. 4 - Anti-theft device according to claim 1 characterized in that said movable jaw (2) and said fixed jaw (3) are each provided with a metal sheet (1) having perforated micro-bumps. 5 - Anti-theft device according to claim 1 characterized in that said movable jaw (2) cooperates with a pivoting lever (5) articulated relative to the fixed jaw (3) by an axis (8) and relative to said movable jaw (2) by a contact surface, the assembly ensuring constant pressure over the entire surface to be protected. 6 - Anti-theft device according to claim 1 characterized in that said movable jaw (2) cooperates with a pivoting lever (5) articulated relative to the fixed jaw (3) by an axis (8) and relative to said movable jaw (2) by an off-center axis (9) interacting with a light (12) 7 - Anti-theft device according to claim 1 characterized in that said body (4) is crossed by a light (13). 8 - Anti-theft device according to the preceding claim characterized in that said lever (5) has a light opening into said light (13) of the body (4) when the lever (5) is in the locked position. 9 - Anti-theft device according to claim 1 characterized in that: a) Said contact surfaces are movable relative to each other in a transverse direction between a first position and a second position, b) each of said contact surfaces (20, 30) has complementary profiles formed by an alternation of projecting zones and hollow zones, c) said profiles being configured in such a way that, when said jaws (2, 3) are in the pinching position, a. the tops of the projecting zones of said contact surfaces (20, 30) are in contact when they are positioned in said first position, b. the tops of the projecting zones of said contact surfaces (20, 30) are in contact with the bottom of the hollow zones when they are positioned in said second position. 10 - Anti-theft device according to claim 8 characterized in that said contact surfaces are movable according to said first position and said second position by a transverse sliding. 11 - Anti-theft device according to claim 8 characterized in that said fixed (2) and movable (3) jaws are articulated relative to a pivot axis between: c) a locking position where the two contact surfaces (20, 30) are brought together and locked by the magnetic locking means until it is deactivated, d) an insertion position where the two contact surfaces (20, 30) are separated. 12 - Anti-theft device according to claim 8 characterized in that said complementary profiles have teeth forming the protruding zones spaced with a constant pitch by grooves forming the hollow zones. 13 - Anti-theft device according to the preceding claim, characterized in that the width of said teeth is less than the width of said grooves. 14- Anti-theft device according to at least one of claims 1 to 3 characterized in that said movable jaw (2) or said fixed jaw (3) is extended by a transverse lip (50), in front of their contact surface (1), said lip (50) extending parallel to the front surface (55) of the opposite jaw, in the locked position. 15 - Anti-theft device according to at least one of claims 1 to 3 characterized in that at least one of said jaws (2, 3) is provided with a feeler (80) flush with the surface of the contact zone (20, 30) and in that the body of the device contains an electronic alarm module. 16 - Anti-theft device according to at least one of claims 1 to 3, characterized in that it comprises a locking lever (50) for the jaws (2, 3) having a button (90) formed at the end of a pivoting elbow piece, said locking lever (50) interacting with the lever (5) to lock it in the locking position of the anti-theft device. 17 - Anti-theft device according to at least one of claims 1 to 3 characterized in that the lever (5) is provided with teeth (100 to 104) split to present a deformable blade (110 to 114).

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