EP2910714A1 - Lock cylinder with anti-tampering means - Google Patents

Abstract

The invention relates to a barrel (1) provided with a rotor (20) equipped with at least one keyway (22), a stator (10) equipped with a cylindrical sleeve (11) in which is received the rotor (20), and a tapped hole (15) for fixing the barrel to a lock with a screw and through which passes a plane (P) perpendicular to the axis of rotation of the rotor (20). ), said plane (P) sharing the stator in a first portion (1a) containing the one or one of the key paths, said outer portion, and a second portion (1b), said inner portion. According to the invention, the barrel is further provided with an anti-burglary device comprising an insulated electric wire (51) fixed to the stator (10), an electronic circuit () and means for emitting an alarm signal, and that the two ends of the electric wire (51) are connected to the electronic circuit (52) forming, between its two ends, a loop which is hooked by means of attachment (16) to the outer part (1a) of the barrel so that in the state mounted in a lock, the electric wire is torn at the moment when the outer portion (1a) of the barrel is forced out of its housing.

Description

The invention relates to a barrel provided with a rotor equipped with at least one keyway, a stator equipped with a cylindrical sleeve in which the rotor is received, and a tapped hole for fixing the barrel to a lock with a screw and through which passes a plane perpendicular to the axis of rotation of the rotor, said plane sharing the stator in a first portion containing the one or one of the key paths, said outer portion, and a second part, called inner part.

A large majority of burglaries are breaking into the front door. It is nice to equip the door with different security, such as multi-point locks or armored doors, the weak point is the cylinder or barrel.

A common technique used by burglars is to smash the barrel at its weak point, that is to say at the recess provided for the rotation of the bit. This rather narrow portion of the barrel is further weakened by the presence of a threaded hole for receiving the screw for fixing the barrel in the lock.

If the outside of the barrel protrudes more than 3 mm from the door, it offers a good grip and the outside of the barrel can be easily torn off. A strong pull is already enough to tear the barrel of its housing, thus leaving access to the bolt of the door. To make tearing more difficult, it can protect the outer face of the barrel by a rosette or a pad, which however can be easily ripped off. Another mode of operation consists in striking the outer face of the barrel with a sharp blow, which causes it to break at the recess of the blade. Once the barrel broken in half, just take out its outer portion to have access to the device for actuating the bolt.

Various solutions have been proposed by the manufacturers to make the cylinder less fragile. For example, a manufacturer reinforces the cylinder over its entire length by a treated steel core. However, these solutions only allow to delay the work of the burglar. If the latter is well equipped and well decided, it will eventually achieve its ends.

Another solution is to place in the room to be protected presence detectors that trigger an alarm when a person passes in front. This assumes, however, that the alarm is triggered, which is generally not the case when people are in the dwelling. Thus, a door opening detector will not sound if someone opens the door while the alarm is off. After having smashed the barrel, which does not make much noise, a burglar can easily get into the housing without attracting the attention of its otherwise occupied inhabitants.

Document is known WO 2009/093 090 A1 an anti-burglary device consisting of an electric loop which is interrupted in case of tearing of the barrel. The monitoring device consists in particular of two insulating rings each threaded at one end of the cylinder. Each ring is provided with a sensor consisting of a threaded hole in which can penetrate a conductive threaded rod. Each threaded rod is connected via a cable to a connection itself connected directly or indirectly to an alarm unit. During assembly, the rings are threaded on the ends of the cylinder and the threaded rods are screwed until their pointed end is in contact with the body of the cylinder. A closed circuit is thus formed which starts from the alarm unit, passes through the first connection, the first cable, the first threaded rod, passes through the body of the cylinder, exits through the second threaded rod, the second cable, the second connection to return to the alarm unit. If part of the cylinder is removed, the circuit opens and the alarm can be triggered. This device is particularly complicated to mount. If the ring is mounted on a protruding part of the barrel, it must be hidden behind a rose that can be easily torn off. If the barrel does not protrude from the door, the ring must be mounted in a recess made in the door, which requires that it is full. In addition, the contacts between the threaded rods and the barrel may oxidize or relax after the many shakes experienced by the barrel when opening and closing the door. In this case, the device will trigger a false alarm.

The document DE 103 25 731 A1 evokes very vaguely the possibility of placing a control device flat on a cylinder. The device would consist of two conductors arranged in an insulating envelope and separated from one another by an insulator. The insulation is supposed to leave the envelope in case of rupture or deformation of the cylinder, so that nothing would prevent the two drivers to come into contact and trigger the alarm. Here too, the device is very sensitive to the shakes suffered by the barrel when the door slams. The insulation may leave your home accidentally causing a false alarm. If, on the contrary, it is too well fixed not to fall easily, it may not escape when the cylinder is damaged.

The document DE 198 33 834 A1 very briefly describes an anti-theft device. An electric cable is placed in a PVC tube. The electric cable cooperates with a relay. The screw to fix the cylinder in the door passes through this PVC tube. When the cable is broken after pulling the cylinder by the Zieh-Fix® method for example, the relay triggers an alarm. This solution does not seem very reliable in many ways. Firstly, the wire passes into a PVC tube which must receive the barrel fixing screw. It is likely that the wire will be damaged when screwing the screw triggering an alarm as soon as the cylinder is put in place. In addition, the presence of the PVC tube does not allow proper screwing and fixing the barrel is doubtful. Finally, pulling the barrel does not necessarily cause tearing of the fastening screw. So the wire may not be torn off and the alarm will not be triggered.

The document DE 92 10 237 U1 proposes an anti-theft device for a car barrel. It consists of a loop of a coated wire placed either inside the rotor or inside the stator, this loop being connected to an analysis circuit. If a thief tries to pierce the cylinder with a wick, it will damage the loop and trigger an alarm. The document does not specifically indicate where and how to place the mouth on the rotor or on the stator. It is only indicated in the case of mounting on the stator that the loop must closely surround the rotor. In any case, the wire can not pass in a circular channel made in the stator, because such a channel would not be feasible. It must therefore be concluded that it is placed at the interface between the rotor and the stator. In this case, the risk that the insulation varnish wears over time is very important. In addition, the document gives no concrete indication of how the loop is connected to the electronic circuit. If the barrel is torn in the traditional way, the wire will not be damaged and no alarm will be triggered.

The object of the invention is therefore to inform the occupants of an attempted break-in on the barrel and develop a barrel provided with an anti-burglar device that is simple to mount, robust and insensitive to the shaking suffered by the door . Another object of the invention is that the anti-burglary device is of high reliability.

This object is achieved because the barrel further comprises an anti-burglary device consisting of an insulated electrical wire fixed to the stator, an electronic circuit and means for transmitting an alarm signal. In addition, the two ends of the electric wire are connected to the electronic circuit forming, between its two ends, a loop which is hooked by means of attachment to the outside of the barrel so that in the assembled state in a lock, the electric wire pulls out at the moment when the outer part of the barrel is extracted from its housing. Thus, when the burglar has succeeded in extracting the outer portion of the barrel, the anti-tampering device of the invention emits a signal informing the occupants or a supervisory agent of the partial extraction of the barrel before the burglar has had time. to enter the dwelling.

This can be easily achieved by choosing the length of the wire so that it is just sufficient for, in the mounted state of the barrel in a lock, to go from the electronic circuit to the hooking means and back to the electronic circuit, so that that in the state mounted in a lock, the electric wire is torn off when the outer portion of the barrel is extracted from its housing. The hooking of the wire can be achieved for example by passing through a wire passage made in the outer part of the barrel and in which can pass the loop of the wire. Rather than a passage, it can provide a notch made in the outer part of the barrel and forming a kind of hook in which the loop of the electric wire can be retained. If the outside of the barrel is torn off, the wire breaks breaking the electrical circuit. So that the strands of the wire do not interfere with the mounting of the barrel in the lock, it is preferable that a groove is formed on each of the lateral faces of the barrel to guide the strands of the loop of the electric wire from the attachment means to the inside of the barrel, preferably to the face of the barrel opposite to the outer portion. It is preferable that the strands of the loop of the electrical wire are glued at least partially in one or both grooves. Thus, the electronic circuit can be placed for example on the inner face of the door while being inaccessible to the burglar from the outside.

The alarm signal can be processed in different ways.

The simplest is to provide the electronic circuit of a siren and / or a visual alarm and means for triggering the siren and / or the visual alarm when the outer portion of the barrel is not in its housing. However, it may be better to place the siren and / or the visual alarm elsewhere than at the door. In this case, the electronic circuit is provided with a radio transmitter. The anti-theft device comprises in in addition to a radio receiver with a siren and / or a visual alarm and means for triggering the siren and / or visual alarm when the outer portion of the barrel is not in its housing. The radio receiver with siren and visual alarm can be placed in a more strategic location of the housing, or even be designed to be carried by the occupant during his movements in his home, garden, cellar or attic.

To stop the siren and / or the visual alarm, one can provide a simple switch on which the occupant supports. However, to prevent the burglar cut the alarm itself, it is best to provide a digital code to stop the siren and / or visual alarm with a code.

It can also be useful to transmit the alarm in the form of a short message, a phone call or an e-mail. For this, the electronic circuit may be provided with a GSM transmitter capable of sending telephone calls and / or short messages. It may also be equipped with a WIFI transmitter capable of generating e-mails and transmitting them to a WIFI terminal connected to the Internet.

The electronic circuit can be placed in different places. In a first variant, it can be placed in the lock or on the door. It is also possible to house a portion of the electronic circuit on the barrel, preferably on the inside of the barrel. The electronic circuit is then provided with means for wirelessly transmitting the wire breaking information to means for transmitting the alarm signal located at a distance from the barrel. In this second embodiment, the barrel may be provided with a second wire passage, the first and the second wire passage being placed on either side of the plane of rupture. Similarly, it is preferable to place the part of the electronic circuit fixed to the barrel in one or more housings made on the lateral face or faces of the barrel. The part of the electronic circuit placed on the barrel can be carried by several cards, part of which is placed on the first side face of the barrel and the other part is placed on the second side face of the barrel. The different cards are preferably placed on the same side of the plane of rupture (P). Wiring passages may be provided to connect the cards together.

Figure 1 :

une vue de côté d'un barillet à deux entrées selon un premier mode de réalisation de l'invention ;

Figure 2 :

une vue de face du barillet de la figure 1 ;

Figure 3 :

une vue de côté d'un barillet à une entrée selon l'invention ;

Figure 4 :

une représentation schématique du dispositif complet avec un barillet selon la figure 1 ;

Figure 5 :

une vue de dessus d'une deuxième variante de réalisation de l'invention ;

Figure 6 :

une vue de droite du barillet de la figure 5 ;

Figure 7 :

une vue de gauche côté du barillet de la figure 5 ;

Figure 8 :

une vue de face du barillet de la figure 5 ;

Figure 9 :

une représentation schématique vue de dessous du branchement du circuit électronique du barillet de la figure 5(a) à l'exemple d'un barillet long et (b) à l'exemple d'un barillet court ;

Figure 10 :

une représentation schématique du circuit électronique utilisé dans le barillet de la figure 5 ;

Figure 11 :

une représentation schématique d'un autre mode de réalisation de l'invention.

The invention is described in more detail below with the aid of an exemplary embodiment. The figures show:

Figure 1 :

a side view of a two-input cylinder according to a first embodiment of the invention;

Figure 2:

a front view of the barrel of the figure 1 ;

Figure 3:

a side view of a cylinder with an inlet according to the invention;

Figure 4:

a schematic representation of the complete device with a cylinder according to the figure 1 ;

Figure 5:

a top view of a second embodiment of the invention;

Figure 6:

a right view of the barrel of the figure 5 ;

Figure 7:

a left side view of the barrel of the figure 5 ;

Figure 8:

a front view of the barrel of the figure 5 ;

Figure 9:

a schematic representation seen from below of the connection of the electronic circuit of the cylinder of the Figure 5 (a) for example, a long barrel and (b) the example of a short barrel;

Figure 10:

a schematic representation of the electronic circuit used in the barrel of the figure 5 ;

Figure 11:

a schematic representation of another embodiment of the invention.

The majority of barrels used today are pin barrels. There are different shapes, especially for flat keys or cylindrical wrenches, but their operation is substantially the same: a rotor housed pivoting in a stator is locked in rotation by pins that can be moved by a suitable key by releasing the rotation of the rotor. As an example, consider a key-lock cylinder as shown by way of example on Figures 1 to 4 . Such a barrel is constituted by a stator (10) fixed to the lock (30) and a rotor (20) which, when rotating, drives in rotation a bit (21) which itself actuates the bolt of the lock. The rotor has a slot called a key path (22) into which the key is inserted. It is pierced with a series of housings perpendicular to the key path in which pins are placed. These pins are placed at the notches of the key. The stator is also provided with a series of housings which, when the cylinder is in the closed position, are aligned with the housing of the rotor. The rotor housings and those of the stator are schematically represented in dashed lines on the figure 3 . Counter-pins are placed in the stator housings. Springs push the cotter pins against the pins which are thus pushed into the key way. In the absence of a key, the counter-pins protrude from their housings and penetrate those of the rotor: they block the rotation of the rotor in the stator. The pins have different heights. When a key is introduced into the barrel, the notches of the key repel more or less depending on their depth pins in the direction of the stator, thus pushing against the pins against the effect of the springs. If the notches of the key have the correct depth, the line of separation between the pin / cotter pin pairs aligns with the line of cut between the rotor and the stator: it is possible to rotate the rotor and the bit and to operate the bolt of the lock. On the other hand, if one of the notches does not have the desired depth, the pin does not push the pin back enough in the stator and the latter stays astride between the stator and the rotor. It is also possible that the pin is pushed too far forward and that it is she who straddles the rotor and the stator. In both cases, the rotation of the rotor is blocked by the presence of the pin or the cotter pin located astride between the two parts.

• un manchon cylindrique (11) situé dans la partie supérieure du stator et dans lequel est logé le rotor (20),
• un corps (12) situé en dessous du manchon cylindrique (11) dans lequel sont réalisés les logements pour les contre-goupilles et
• une âme (13) située en dessous du corps (12).

The invention is particularly well suited to so-called European drums. A European barrel is characterized by its stator (10). The stator is divided into three main parts:

• a cylindrical sleeve (11) located in the upper part of the stator and in which the rotor (20) is housed,
• a body (12) located below the cylindrical sleeve (11) in which the housings for the counter-pins and
• a core (13) located below the body (12).

To accommodate the bit, a recess (14) is formed in the stator body at the end of the cylindrical sleeve (11). Furthermore, a tapped mounting hole (15) is formed in the core (13) above the recess (14) to accommodate the bit. This threaded hole is used to fix the cylinder in the lock with a screw.

Those skilled in the art will understand that the invention can be applied to other types of barrels.

There are barrels at an entrance (cf. figure 3 ), button barrels and barrels with two entries (cf. figures 1 and 4 ). In the first two cases, there is only one rotor and the barrel can only be operated with the key on one side. In the third case represented in figures 1 and 4 , the barrel has two rotors located on both sides of the location of the bit so that it is possible to actuate the barrel with the key on both sides. In all three cases, the part of the narrower barrel in the extension of the recess (14) for the bit (21) is a weak point, especially since it is still weakened by the presence of the fixing hole (15). In case of shock in the direction of the white arrow of the figure 4 or excessive traction in the direction of the black arrow of the figure 4 , the barrel breaks in two at the axial plane (P) perpendicular to the axis of rotation of the rotor (20) and passing through the fixing hole (15). This plan, later called a fracture plan, is marked on the figures 1 and 4 .

The object of the invention is to trigger an alarm when a part of the barrel has burglarized its housing in the lock. In practice, this will be the part (1a) of the cylinder located, relative to the fracture plane (P), on the side of the outer face (41) of the door (40), that is to say to say the front of the door accessible to burglars. This part (1a) will be called outer part in the following description, and the other inner part. Two alternative embodiments are presented here.

In both cases, the barrel is provided with a detection device (50) consisting of an electrical wire (51) and an electronic circuit (52; 521, 522) to which the two ends of the insulated electrical wire are connected. (51) forming a loop. According to the invention, it is intended to pierce the barrel by at least one wire passage (16) preferably perpendicular to the axis of rotation of the rotor (20). This wire passage (16) is located between the fracture plane (P) and one of the front faces of the barrel. The wire passage is preferably made in the core of the stator, for example lower than the fixing hole (15). The loop formed by the electric wire (51) passes through this wire passage (16). The electrical wire (51) is dimensioned such that in the state mounted in the lock, there is practically no play. Its length must correspond substantially to the shortest path necessary to pass it from the electronic circuit. (52; 521, 522) at the wire passage (16) and back.

The electronic circuit (52; 521, 522) is provided with an electronic circuit for detecting the breaking of the electric wire and triggering an alarm. Both functions can be placed on a single card or on two associated cards in the same box. They can also be placed on two separate maps placed in different places. In this case, the detection card is provided with a radio transmitter and the card managing the alarm of a radio receiver. The alarm can be auditory and / or visual. It can also consist of a phone call, sending a message and / or sending an email over the internet.

So that the electric wire (51) does not interfere with the installation of the barrel in the lock, it is intended to make a groove (17) on each of the lateral faces of the barrel to guide the electric wire from the ends of the wire passage (16) to the part of the barrel located on the other side of the fracture plane (P). In practice, it will be preferable that the grooves extend to the front face of the cylinder located on the other side of the invoice plane (P). To facilitate the mounting of the barrel in the lock, it is better to stick in the grooves one or both strands of the loop formed by the electric wire.

It is not essential that the passage of wire passes through the barrel, it can be made on one side, or it can be replaced by a notch used to hold the mouth of the electric wire.

The wire passage or the notch could be made at the cylindrical sleeve (11). This embodiment of the invention can therefore be applied to all cylinders, whatever their shape.

In the first embodiment variant presented to Figures 1 to 4 , the electronic circuit (52) is placed at a distance from the barrel. The electric wire (51) is passed through the wire passage (16) located on the side of the outer face (41) of the door and the two strands are brought to the side of the inner face (42) of the door along the grooves. Both ends are connected to the electronic circuit (52). The latter can be hidden in the handle lining or be placed in a housing fixed to the inner face (42) of the door. For reasons of simplicity, it is preferable, at least in the case of barrels with two inputs, to make two wire passages (16) symmetrical with respect to the fracture plane (P). Thus, the barrel can be used in one direction or the other. If the barrel is provided with two wire passages, the grooves preferably extend over the entire length of the barrel from one end face to the other as shown in FIG. figure 1 .

If the barrel is provided only with a wire passage (16), it must be mounted in the lock (30) so that this wire passage (16) is on the side of the outer face (41). of the door relative to the plane of rupture (P).

When the electronic components used are sufficiently small, the electronic circuit, including the alarm, will preferably be placed in the interior lining of the lock.

If a burglar located on the side of the outer face (41) of the door fractures the barrel and attempts to remove the portion (1a) located on its side, it pulls the electric wire (51). The electronic circuit (52) detects the breakage of the electric wire (51) and triggers an alarm. The length of the wire (51) being chosen as short as possible, the breaking of the wire is made from the beginning of the extraction movement of the barrel.

In the second embodiment of the invention visible on the Figures 5 to 9 , a part (521, 522) of the electronic circuit is placed directly on the barrel. This part is equipped with a radio transmitter. A second part of the electronic circuit, provided with a radio receiver, is placed at a distance. To fix the first part of the electronic circuit, one or more slots are milled in one or both side faces of the body (12) of the barrel. In the example presented at figure 10 , the first part of the electronic circuit consists of a first card (521) for the battery and a second card (522) for the microcontroller. The ends of the electrical wire are connected to the microcontroller board by dedicated ports (BC). In addition, two cables connect the two cards to provide power (ports + 3V and 0V).

When the cylinder is sufficiently long (case shown schematically on the figure 9a ), it is possible to place the two elements on the same side face. In this configuration, the two cards (521, 522) can be combined into one. It suffices to make a single housing (18) in the part of the barrel that does not include the housing of the cotter pins. Two wire passages (16, 16 ') suffice, one on each side of the plane of rupture (P). The first end of the electrical wire is connected to the microprocessor board (522). The wire then runs along the first face of the barrel through the first groove (17), passes the rupture plane (P), passes through the first wire passage (16) located opposite the housing (18) relative to the rupture plane (P), along the second face of the cylinder passing through the second groove (17), passes the rupture plane (P), passes through the second wire passage (16 ') located on the housing side (18) and returns to the microprocessor board to which the second end of the wire is attached. The length of the electric wire is chosen so that it is just enough to do this trick. The path of the electric wire is schematically represented on the figure 9a .

If the cylinder is smaller (case shown schematically in the figure 9b ), the place is not always sufficient to place the two cards on the same lateral side of the barrel. In this case, two housings (18, 18 ') can be provided, one on each side of the barrel. Both housings are made on the same side of the plane of rupture (P). In this configuration, four passes must be made: two wire feedthroughs (16, 16 ') for the electrical wire loop and two wiring passes (19, 19') to connect the two cards together. The wire passages (16, 16 ') must be placed on either side of the rupture plane (P). These four passages are marked in dotted line on the figure 5 . This solution can also be used to avoid placing housing at the housing level for the cotter pins, as shown in Figures 5 to 8 . In the case of short barrels, the dwellings will be made in the area of the housing for the cotter pins. To avoid weakening the barrel, it may be wise in this case to shift the two housings as shown schematically on the figure 9b . The course of the wire is the same as in the case of a longer barrel. A placement of the two electronic cards on either side of the plane of rupture (P) is to be avoided, because the rupture of the cylinder could cause the rupture of the wires of wiring, unless to foresee them long enough so that they do not do not break before having time to transmit the alarm signal. The penetration of the wire passages (16, 16 ') and the wiring passages (19, 19') will be low enough not to pass into the housings for the cotter pins and the springs. On the other hand, they will be able to pass by the plugs closing these housings, plugs represented schematically on the Figures 9a and 9b .

With a barrel according to the second embodiment, it is preferable to place the cards forming the electronic circuit on the inside of the lock. However, it would be possible to place them on the outside. Indeed, as soon as the alarm signal has been transmitted, these cards have no function.

In both embodiments, an alarm signal is generated as soon as the outer portion (1 a) of the barrel has left its normal position.

The electronic circuit may be provided with a siren and / or a visual alarm. In this case, it will preferably be placed inside a box fixed on the inner face of the door so that the siren is well audible and / or the visual alarm clearly visible.

It may however be more interesting that the siren and / or the visual alarm are triggered in a more centered location of the housing. In this case, the circuit of the first embodiment is provided with a radio transmitter (53), as is the case in the second embodiment. The signal transmitted by the radio transmitter is detected by a radio receiver (54) placed in a better adapted location. This radio receiver can be equipped with a siren and / or a visual alarm. It can be nomadic so that it can be taken by the occupant during his travels in his home, especially in his garden, cellar or attic.

It is also possible that the alarm is transmitted to a control agent in the form of a message via the wired or portable telephone network or via the Internet. The electronic circuit (52, 66) will then be provided with a GSM transmitter or a WIFI component.

It can be expected that the triggering of an alarm not only causes the siren and / or the visual alarm to be activated, but also sends a message to a control agent in the form of an SMS. or an email.

To stop the siren or the visual alarm, one can provide a simple button or a delay element that will turn off the alarm after a certain period of time. It can also provide a digital code so that only people knowing the code can turn off the alarm.

It can also be provided that the alarm is cut off remotely, namely through the telephone network or the Internet.

Whichever embodiment variant is chosen, the alarm is triggered as soon as the outside of the barrel leaves its location, even before the door is opened. In addition, the anti-tamper device of the invention can adapt to all types of barrels.

The advantage of the invention lies in the fact that only the barrel must be modified, the lock remaining unchanged. In addition, the changes made on the barrel (wire passages and grooves) are simple to perform and inexpensive. Since the electrical circuit consists solely of the wire and not of several elements connected in series, there is no risk of an accidental interruption of the circuit following oxidation of one of the contact points or a gap between the contacts. different elements. Furthermore, by hooking the wire between the rupture plane (P) and the outer face of the barrel and giving it the smallest possible length, it is ensured that it is torn off as soon as the outer portion of the barrel is removed.

Other solutions are conceivable, such as the presence of an accelerometer on the outer part (1a) of the cylinder whose signal is operated only when the lock is in the closed position.

The object of the invention can also be achieved by placing the detection means in the lock or in the lock lining. The figure 11 shows an example of realization of this other solution. This figure schematically shows the internal face of a lining (60) intended to be placed on the outer face (41) of the door. Conventionally, this lining is provided with a plate (61) with raised edges, an axis (62) connected to the handle (63) and a hole (64) for the passage of the barrel (1). A light barrier consisting of a transmitter (65a) and a receiver (65b) is placed on either side of the barrel (1). This light barrier is connected to an electronic circuit (66) powered by a battery (67). The depth of the filling is generally sufficient to place these constituents. Another variant provides for placing the light barrier directly in the lock (30), or even in the door, at the outer portion (1a) of the cylinder, the other components being either placed inside the lock, or reported on the inside (41) of the door.

As long as the barrel is in place, it interrupts the light beam of the light barrier and the detector does not receive light. As soon as the outer portion (1a) of the barrel is extracted from its housing, there is no obstacle between the transmitter and the receiver. The electronic circuit receives a corresponding signal and triggers an alarm. In this case, the alarm is triggered only when the outer portion (1a) of the barrel is sufficiently spaced apart to leave the field free to the light beam. The closer the barrier is placed near the plane of rupture, the sooner the alarm signal will be emitted.

Other solutions are conceivable here too, such as for example a position switch placed in the lock in contact with the outer portion (1a) of the barrel. When the outer portion (1a) of the cylinder is in place, it presses the switch leaving the circuit open (or closed depending on the type of switch). If this outer part (1a) is removed, nothing presses the switch that closes (or opens) causing the emission of an alarm signal.

In yet another solution, it is intended to provide the barrel with a first component and the lock of a second component cooperating with the first. An electronic circuit detects the cooperation of the two components and triggers an alarm when it disappears following the extraction of the outer portion (1a) of the barrel. For example, it is possible to provide the outer portion (1a) of the barrel with one or more magnets cooperating with blades of one or more Reed type reed-type switches placed in the lock. It is also possible to use a radio identification device (RFID) and in particular the near field communication (NFC) technique. A marker, for example a radio-tag, is placed on the outer portion (1a) of the barrel while a reader is placed in the lock, on the door or in the liner (60). The two components are placed close to each other so that the marker can respond to a signal from the reader. If against the outer part of the barrel (1a) is torn off, the marker is too far from the reader to respond. The absence of a marker response triggers the alarm. Other sensors known to those skilled in the art can be envisaged.

List of references:

1

barrel
1a Outside part of the barrel
1b Rear part of the barrel
P Break plan
10 Stator
11 Cylindrical sleeve
12 Body
13 Soul
14 Recess for the bit
15 fixing hole
16 Passing wire
16 'Thread passing
17 Grooves
18 Housing part of the electronic circuit
18 'Housing of another part of the electronic circuit
19 Wiring passage
19 'Wiring passage
20 Rotor
21 Panneton
22 Key path

30

Lock

40

Door
41 Outside of the door
42 Inside of the door

50

Anti-theft device
51 Electric wire
52 Electronic circuit
521 Stack card
522 Microprocessor card
53 Radio transmitter
54 Radio receiver

60

Garnish
61 Plate
62 Axis
63 Handle
64 Hole
65a Emitter of the light barrier
65b Receiver of the light barrier
66 Electronic circuit
67 Battery

Claims (15)

Barrel (1) fitted - a rotor (20) equipped with at least one key path (22); a stator (10) equipped with a cylindrical sleeve (11) in which the rotor (20) is received, and a threaded hole (15) for fixing the barrel to a lock with the help of a screw and through which passes a plane (P) perpendicular to the axis of rotation of the rotor (20), said plane (P) sharing the stator in a first portion (1 a) containing the one or one of the key paths, said outer portion, and a second portion (1b), said inner portion; characterized in that the barrel is further provided with an anti-tamper device comprising an insulated electrical wire (51) attached to the stator (10), an electronic circuit (52; 521, 522) and means for emitting an alarm signal , and in that the two ends of the electric wire (51) are connected to the electronic circuit (52; 521, 522) forming, between its two ends, a loop which is hooked by means of attachment (16) to the outer portion (1a) of the barrel so that in the state mounted in a lock, the electric wire is torn at the moment when the outer portion (1a) of the barrel is forced into its housing. Barrel according to claim 1, characterized in that the length of the wire is just sufficient for, in the mounted state of the barrel in a lock, to go from the electronic circuit (52; 521, 522) to the attachment means (16) and return to the electronic circuit, so that in the state mounted in a lock, the electric wire is torn at the moment when the outer portion (1a) of the barrel is extracted by breaking of its housing. Barrel according to claim 1 or 2, characterized in that the attachment means are constituted by a wire passage (16) formed in the outer portion (1a) of the barrel and in which can pass the loop of the wire. Barrel according to claim 1 or 2, characterized in that the attachment means are constituted by a notch formed in the outer portion (1a) of the barrel and in which can hook the loop of the wire. Barrel according to one of the preceding claims, characterized in that a groove (17) is formed on each of the lateral faces of the barrel for guiding the strands of the loop of the electric wire (51) from the attachment means (16). until the game inner barrel (1b), preferably to the face of the barrel (1) opposite the outer portion (1a). Barrel according to claim 5, characterized in that the strands of the loop of the electric wire (51) are glued at least partially in one or both grooves (17). Barrel according to one of the preceding claims, characterized in that the electronic circuit (52; 521, 522) is provided with a siren and / or a visual alarm and means for triggering the siren and / or the alarm visual when the electric wire (51) has been torn off. Barrel according to one of the preceding claims, characterized in that the electronic circuit (52; 521, 522) is provided with a radio transmitter and in that the anti-burglary device further comprises a radio receiver (54) provided with a siren and / or a visual alarm and means for triggering the siren and / or visual alarm when the electrical wire (51) has been torn off. Barrel according to claim 7 or 8, characterized in that the anti-burglary device is further provided with a switch for stopping the siren and / or the visual alarm with a simple press on the switch or a digital lock to stop siren and / or visual alarm using a code. Barrel according to one of the preceding claims, characterized in that the electronic circuit (52; 521, 522) is provided with a GSM transmitter capable of sending telephone calls and / or short messages and / or a suitable WIFI transmitter. to generate emails and transmit them to a WIFI terminal connected to the internet. Barrel according to one of the preceding claims, characterized in that a part (521, 522) of the electronic circuit is placed on the barrel, preferably on the inner part (1b) of the barrel, and in that it is provided with means for transmitting a signal to alarm means placed at a distance from the barrel. Barrel according to claim 11, characterized in that the barrel is provided with a second wire passage (16 '), the first and the second wire passage (16, 16') being placed on either side of the plane breaking point (P). Barrel according to claim 11 or 12, characterized in that the portion (521, 522) of the electronic circuit placed on the barrel is received in one or more housings (19, 19 ') made on the lateral face or faces of the barrel. Barrel according to one of claims 11 to 13, characterized in that the part (521, 522) of the electronic circuit placed on the barrel is carried by several cards, part of which is placed on the first lateral face of the barrel and the other part is placed on the second side face of the barrel. Barrel according to claim 15, characterized in that the different cards are placed on the same side of the plane of rupture (P), and in that wiring passages (18, 18 ') are provided for connecting the cards together.

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