EP0151081A2 - Safety lock, fitted to prevent its fraudulent opening - Google Patents

Abstract

1. A safety lock comprising a rotor (1) in a stator (2) housed in a hood (3) fixed to a capping plate (6), the rotor (1) having a housing (16) able to receive a key (8) and being provided, at its end opposite to the opening for the entry of the key, with a part (9, 54, 72, 79) fixed to the rotor (1) and equipped with a finger (10) designed to move a bolt (11) when the rotor (1) and the said part are rotated by the key, characterized in that it comprises means to entrain the stator (2) integrally in rotation with the rotor (1) as a result of the action of an incorrect key or of another tool in the case of an attempted fraudulent opening of the lock, this disruption as a result initiating a displacement of the axis of rotation of the finger (10) fixed to the rotor (1), or a withdrawal in axial translation of this finger relative to the bolt (11), in order to prevent any operation of the bolt (11) through the introduction of the incorrect key or other tool, the stator (2) being connected to the hood (3) by an elastic coupling element (4, 17) which can be overcome by the action of a torque between the said stator (2) and the said hood (3).

Description

The subject of the present invention is a lock with an added safety block, arranged to prevent its fraudulent use.

The lock targeted by the invention is of the type with barrel comprising a rotor mounted in a stator housed in a cover fixed to a catch, the rotor having a housing capable of receiving a key and being provided at its end opposite to the opening d entry of the key, of a part integral with the rotor and provided with a finger intended to drive a bolt when the rotor and said part are rotated by the key.

The invention therefore applies to cylinder safety blocks comprising an inner rotor or cylinder and an outer stator or cylinder. The two cylinders can be concentric or non-concentric. The invention is also applicable to pump safety blocks.

In all cases, under the action of the correct key, the rotor turns in the stator, which makes it possible to actuate the maneuver of the bolt.

We know that in locks of the type in question, the rotor and the stator of the safety blocks are. as a general rule, made integral by means of a set of pins or flakes placed perpendicular to the axis of rotation of the rotor and bearing on both the rotor and the stator. The introduction of the right key moves the pins and the flakes according to the right combination, so as to allow the rotation of the rotor inside the stator. When the key is removed, springs return the pins or the glitter to the locked position.

The rear end of the rotor carries a part transmission fitted with an eccentric finger relative to the axis of rotation of the rotor. This finger enters notches made in the bolt of the lock to transform the rotational movement of the rotor into a translational movement of the bolt, in known manner.

Fraudulent opening of the reported safety block locks can be obtained by non-destructive or destructive means.

Non-destructive means require, among other things, the application of a torque to the rotor by means of an appropriate hook, also called a driver, introduced in place of the key while another suitable tool tries to place the pins in position for passage by feel. Likewise, the size of a dummy key necessitates exerting a torque on the rotor by manipulating a key blank in safety, and gradually cutting it thanks to the fingerprints left by the pins.

Among the destructive means, we know the forced rotation of the barrel by means of a strong clamp, when the latter is sufficiently projecting with respect to the plane of the door, or by means of a blade terminated by a lever arm introduced at the place of the key. This forced rotation causes the destruction of the stator attachment on the lock and therefore the rotation of the rotor assembly and the stator linked by the pins, which allows the latch drive. - The drilling of the stator by means of '' a metal drill which allows access to the bolt also produces a torque on the stator.

We see that in all cases of fraudulent opening, the stator is subjected to a torque.

The object of the invention is to prevent any possibility of fraudulent opening of the lock using one of the above means.

According to the invention, the safety lock comprises means for rotating the stator in solidarity with the rotor under the action of a dummy key or another tool with a view to fraudulently opening the lock, and for triggering therefore a displacement of the axis of rotation of the finger integral with the rotor, or a withdrawal in axial translation of this finger relative to the bolt in order to prevent any actuation of the bolt by introduction of the false key or other tool.

Thus, the invention allows on the one hand to disengage the stator under the action of an abnormal torque, and on the other hand to modify the trajectory of the latch drive finger, in order to prevent it from s '' Engage in the notches of the latch in the event of fraudulent manipulation. This trajectory can be modified either by reducing the angular amplitude of the movement of the finger by transverse displacement of the axis of rotation of the finger, or by axial translation of the finger to position it outside the plane of displacement of the bolt.

Under these conditions, any attempt to irregularly open the lock by one of the means mentioned above is doomed to failure, the bolt drive finger being automatically kept out of the bolt's reach.

• - la Figure 1 est une vue en coupe axiale d'un premier mode de réalisation d'une serrure de sûreté selon l'invention, à goupilles et rotor excentré dont la sécurité est obtenue par réduction de l'amplitude du mouvement de rotation du doigt d'entrainement du pêne;
• - les Figures 2, 3 et 4 sont des vues en élévation partielle du pêne et de son doigt d'entrainement, prises dans un plan perpendiculaire à celui de la Figure 1, et représentant les diverses positions relatives possibles entre le doigt d'entrainement et les encoches du pêne dans la serrure de la Figure 1;
• - la Figure 5 est une vue en coupe axiale d'un second mode de réalisation de la serrure selon l'invention, correspondant à une variante perfectionnée de la Figure 1;
• - la Figure 6 est une vue en coupe transversale suivant VI-VI de la Figure 5, montrant des organes de sécurité supplémentaires de la serrure dans leur position normale correspondant à la position embrayée du stator et à la rotation du rotor sans entrainement du stator;
• - la Figure 7 est une vue analogue à la Figure 6 montrant la position des organes de sécurité de la serrure en cas d'entrainement anormal du stator en rotation;
• - la Figure 8 est une vue en perspective éclatée partielle d'une troisième forme de réalisation de la serrure de sûreté selon l'invention;
• - les Figures 9 et 10 sont des vues en élévation transversale des organes de sécurité de la serrure de la Figure 8, dans deux positions différentes de fonctionnement;
• - la Figure 11 est une vue en élévation longitudinale d'un quatrième mode de réalisation de la serrure selon l'invention, la pièce portant le doigt d'entrainement étant en position normale d'engrènement avec le pêne;
• - la Figure 12 est une vue analogue à la Figure 11. montrant le doigt d'entrainement et sa pièce de support escamotés axialement par rapport au pêne consécutivement à une tentative d'ouverture frauduleuse de la serrure;
• - la Figure 13 est une vue en élévation d'une plaque mobile assurant le déplacement du doigt d'entrainement du pêne dans la réalisation des Figures 11 et 12;
• - la Figure 14 est une vue mi-coupe axiale, mi-élévation, avec arrachements, d'un cinquième mode de réalisation de la serrure selon l'invention, montrant la position des différents organes de la serrure lorsque le doigt est en position d'entrainement du pêne;
• - les Figures 15 et 16 sont des vues en perspective partielle à échelle agrandie par rapport à la Figure 14, des organes de sûreté de la serrure dans deux positions relatives différentes;
• - la Figure 17 est une vue en coupe axiale d'un sixième mode de réalisation de la serrure selon l'invention, le doigt étant en position normale d'entrainement du pêne;
• la Figure 18 est une vue en élévation en bout suivant la flèche F de la Figure 16;
• - la Figure 19 est une vue en coupe transversale analogue à la Figure 18, montrant comment la pièce de support du pêne peut être automatiquement stoppée dans son mouvement de translation axiale en direction du pêne, à la suite d'une fausse manoeuvre de la serrure avec une bonne clé.
• - la Figure 20 est une vue en coupe axiale d'un septième mode de réalisation de l'invention en position normale d'ouverture;
• - la Figure 21 est analogue à la figure 20 mais en position de tentative frauduleuse d'ouverture;
• - les Figures 22 et 23 sont des coupes transversales respectivement selon les lignes A-A et B-B de la figure 21;
• - les Figures 24, 25 et 26 illustrent un système simplifié interdisant une fausse manoeuvre avec la vrai clé d'ouverture;
• - la Figure 27 illustre la protection du capot extérieur par un capot supplémentaire; et
• - les Figures 28 et 29 illustrent deux positionnements possibles d'un grain imperforable destiné à empêcher l'ouverture par perçage au niveau de la ligne de jonction des goupilles.

Other features and advantages of the invention will appear during the description which follows, given with reference to the appended drawings which illustrate several embodiments thereof by way of non-limiting examples:

• - Figure 1 is an axial sectional view a first embodiment of a security lock according to the invention, with pins and eccentric rotor, the security of which is obtained by reducing the amplitude of the rotation movement of the bolt drive finger;
• - Figures 2, 3 and 4 are views in partial elevation of the bolt and its drive finger, taken in a plane perpendicular to that of Figure 1, and representing the various possible relative positions between the drive finger and the notches of the bolt in the lock of Figure 1;
• - Figure 5 is an axial sectional view of a second embodiment of the lock according to the invention, corresponding to an improved variant of Figure 1;
• - Figure 6 is a cross-sectional view along VI-VI of Figure 5, showing additional safety members of the lock in their normal position corresponding to the engaged position of the stator and the rotation of the rotor without driving the stator;
• - Figure 7 is a view similar to Figure 6 showing the position of the safety members of the lock in the event of abnormal drive of the rotating stator;
• - Figure 8 is a partial exploded perspective view of a third embodiment of the security lock according to the invention;
• - Figures 9 and 10 are views in transverse elevation of the safety members of the lock of Figure 8, in two different operating positions;
• - Figure 11 is an elevational view longitudinal of a fourth embodiment of the lock according to the invention, the part carrying the drive finger being in the normal position of engagement with the bolt;
• - Figure 12 is a view similar to Figure 11. showing the drive finger and its support piece retracted axially relative to the bolt following an attempt to fraudulently open the lock;
• - Figure 13 is an elevational view of a movable plate ensuring the movement of the bolt drive finger in the embodiment of Figures 11 and 12;
• - Figure 14 is a half-axial, mid-elevation view, with parts broken away, of a fifth embodiment of the lock according to the invention, showing the position of the various organs of the lock when the finger is in position d 'bolt drive;
• - Figures 15 and 16 are partial perspective views on an enlarged scale with respect to Figure 14, of the safety devices of the lock in two different relative positions;
• - Figure 17 is an axial sectional view of a sixth embodiment of the lock according to the invention, the finger being in the normal position for driving the bolt;
• Figure 18 is an end elevational view along arrow F of Figure 16;
• - Figure 19 is a cross-sectional view similar to Figure 18, showing how the bolt support piece can be automatically stopped in its axial translational movement towards the bolt, following a false operation of the lock with a good key.
• - Figure 20 is an axial sectional view of a seventh embodiment of the invention in the normal open position;
• - Figure 21 is similar to Figure 20 but in the fraudulent attempt to open position;
• - Figures 22 and 23 are cross sections respectively along the lines AA and BB of Figure 21;
• - Figures 24, 25 and 26 illustrate a simplified system prohibiting a false operation with the real opening key;
• - Figure 27 illustrates the protection of the outer cover by an additional cover; and
• - Figures 28 and 29 illustrate two possible positions of an imperforable grain intended to prevent opening by drilling at the junction line of the pins.

Referring to Figure 1, we see a first embodiment of the lock covered by the invention, in which this lock comprises a barrel consisting of a rotor 1 of axis XX and a stator 2 offset from to the rotor 1, the stator 2 being housed in a cover 3 fixed to a catch 6 closing the lock housing, by means of screws such as 7. The rotor 1 has a cylindrical internal housing 16 capable of receiving a key 8, and is provided, at its end opposite to the entry opening of the key 8, with a part 9 made integral with the rotor 1 by means of an axial screw 9a, this part 9 being provided with a longitudinal finger 10, parallel to the XX axis. The finger 10 is intended to drive a bolt 11 in translation by introduction into the notches 11 'of the latter, in a manner known per se, and this in order to open or close the lock according to the direction of rotation of the rotor 1, piece 9 and finger 10.

According to the invention, the lock comprises means for rotating the stator 2 integrally with the rotor 1, under the action of a dummy key or another tool with a view to fraudulently opening the lock, and for triggering therefore a displacement of the axis of rotation of the finger 10, in order to prevent any actuation of the bolt 11 by introduction of the false key or other tool.

In the embodiment illustrated in FIGS. 1 to 4, these safety means are formed as follows: the stator 2 is normally kept fixed in rotation when the rotor 1 is itself rotated by the normal key 8, by means a ball 4 housed in the wall of the cover 3, and held in abutment in a lateral notch 4a of the stator 2 by a spring 5 disposed in a projection tu transverse ball 3a of the cover 3, contiguous to the bolt 6. The spring 5 is supported on a screw 15 screwed into the sleeve 3a in an adjustable manner, so that the ball 4 pushed by the spring 5 normally keeps the stator 2 fixed relative to the rotor 1, by clutching the stator 2 with the ball 4 engaged in the notch 4a. Furthermore, in the absence of the opening key 8, the rotor 1 and the stator 2 are made integral by means of pins 12, 13 capable of sliding in corresponding transverse housings of the stator 2, under the action of springs 'thrust 14 arranged in these housings, in a manner known per se. Finally, the rotor 1 and the stator 2 are not concentric, the axis of rotation YY of the stator 2, parallel to XX, being offset transversely relative to the latter.

• En l'absence de la clé normale 8, le rotor 1 et le stator 2 sont rendus solidaires au moyen des goupilles 12, 13 poussées par les ressorts 14, les goupilles extérieures 12 étant arrêtées par une saillie longitudinale (non représentée), formée intérieurement au logement 16 du rotor 1. Lorsque la bonne clé 8 est introduite dans le rotor 1, elle vient dans la position illustrée à la Figure 1, dans laquelle ses encoches viennent respectivement commander la position des goupilles 12, 13; la jonction entre chaque couple de goupilles 12, 13 se fait exactement au niveau de la surface de jonction du rotor 1 et du stator 2, de sorte que le rotor 1 peut tourner à l'intérieur du stator 2. Au fur et à mesure de la rotation de la clé 8 à partir de cette position, la pièce 9 et son doigt 10 tournent autour de l'axe X-X du rotor 1, et le doigt 10 vient engrener avec le pêne 11 dans l'une des encoches 11' de ce dernier (Figure 2), déclenchant l'ouverture ou la fermeture de la serrure selon le sens de rotation autour de l'axe X-X. Après rotation de la clé 8 sur un tour complet, cette clé peut être retirée et les ressorts 14 repoussent les goupilles 12, 13 qui solidarisent à nouveau en rotation le rotor 1 et le stator 2, comme avant l'introduction de la clé 8.

This lock works as follows:

• In the absence of the normal key 8, the rotor 1 and the stator 2 are made integral by means of the pins 12, 13 pushed by the springs 14, the external pins 12 being stopped by a longitudinal projection (not shown), formed internally to the housing 16 of the rotor 1. When the correct key 8 is introduced into the rotor 1, it comes into the position illustrated in FIG. 1, in which its notches come respectively to control the position of the pins 12, 13; the junction between each pair of pins 12, 13 is made exactly at the junction surface of the rotor 1 and the stator 2, so that the rotor 1 can rotate inside the stator 2. As and the rotation of the key 8 from this position, the part 9 and its finger 10 rotate around the axis XX of the rotor 1, and the finger 10 meshes with the bolt 11 in one of the notches 11 'of the latter (Figure 2), triggering the opening or closing of the lock according to the direction of rotation around the axis XX. After rotation of the key 8 over a full revolution, this key can be removed and the springs 14 push the pins 12, 13 which again in rotation secure the rotor 1 and the stator 2, as before the introduction of the key 8.

In the event of fraudulent operation by the introduction of a wrong key or attempted break-in according to the methods described above, the rotor 1 and the stator 2 are held in rotation by the pins 12, 13 since the absence of the correct key does not allow to obtain the correct positioning of the pins 12, 13 ensuring the free rotation of the rotor 1 inside the stator 2. These two members therefore rotate together in the cover 3 after removal of the ball 4 inside of the sleeve 3a, against the return force of the spring 5. Under these conditions, the finger 10 no longer rotates around the axis XX, but around the axis YY of the stator 2, so that its radius of rotation r around YY is considerably reduced compared to its normal radius of rotation, the axis of rotation YY of the stator 2 being by construction further from the bolt 11 than the axis XX. The axis of the finger 10 could even at the limit be confused with the axis of rotation Y-Y.

Under these conditions, the amplitude of the rotary movement of the finger 10 (FIG. 3) is insufficient to allow it to reach a notch 11 ′, so that the bolt 11 remains out of the reach of the finger 10 and cannot be driven. After cessation of the fraudulent operation, the operation of the safety becomes normal again by using the correct key 8.

As a variant, the positioning of the stator 2 can be obtained by means other than the ball 4 and the spring 5, for example by a safety pin determined to break in the event of forced rotation. In this case, there is a final impossibility of operating the bolt 11, even with the right key, which can in some cases constitute additional security.

However, it can happen without there being any fraudulent operation, that the user does not insert the key sufficiently into the rotor 1. In this case, everything happens as if he had inserted a wrong key, and there n 'y not moving the bolt.

It can also happen that the user, after having pressed the key 8 insufficiently, begins the rotation of the rotor 1-stator 2 assembly, then presses the key 8 during rotation. It thus causes the disjunction of the rotor 1 and the stator 2, which causes the amplitude of the rotation movement of the finger 10 to increase, and the axis of rotation XX to move, so that the finger 10 doesn’t is no longer under the conditions of normal meshing in a notch 11 'of the bolt 11 (Figure 4), and that the mechanism is blocked.

To avoid this drawback, there is added (second embodiment illustrated in Figures 5 to 7), a device which secures the rotor 1 and the stator 2 for the duration of a complete revolution. In this embodiment, the lock is thus provided with a pawl 17 articulated at 16 on the plug 6, on the side of the latter opposite the stator 2 and the rotor 1. The pawl 17 is provided with a boss 19 suitable for come and engage in a complementary notch 21 m swam in a disc 23 and pressing on the top of a plate 22 capable of sliding on the disc 23 fixed to the stator 2 coaxially with the latter, on the side of the shackle 6 facing the bolt 1 ₁ . The plate 22 is guided in its sliding by four feet or pins 24 fixed on the disc 23, under the action of a tension spring 25 attached to the disc 23 at 26, when the boss 19 has come out of the notch 21, in which it tends to be normally held by a spring 27 for returning the pawl 17, attached to one end of the latter opposite its axis of rotation 16: The sliding plate 22 has a central recess 22a making it possible to house a member 28 therein fixed to the rotor 1 by screws 29. The member 28 and the edge opposite the recess 22a are provided with means for securing the member 28 and the plate 22 in rotation in one piece with the rotor 1 , likely to come into action when the plate 22 slides between the pins 24 under the action of the spring 25 from its position in FIG. 6, when the boss 19 comes out of the notch 21. In the example described, these securing means consist of a stud 31 arranged on the edge of the recess 22a, and a mor silent conjugate 32 of the member 28 (or vice versa). Finally, the screws 29 also serve to fix the part 9. supporting the finger 10, to the member 28 and to the rotor 1 (FIG. 5).

• En position d'attente, le cliquet 17 détermine la position du disque 23 par son bossage 19 enfoncé dans l'encoche 21 (Figure 6), et en même temps l'enfoncement de la plaque 22 par son sommet 22b avec lequel ce bossage est en contact, de sorte que le tenon 31 est éloigné de la mortaise 32. L'utilisation de la bonne clé permet dans ces conditions, la rotation du rotor 1 seulement et l'actionnement du pêne.

The operation of the lock of Figures 5 to 7 is as follows:

• In the standby position, the pawl 17 determines the position of the disc 23 by its boss 19 pressed into the notch 21 (Figure 6), and at the same time the depression of the plate 22 by its top 22b with which this boss is in contact, so that the pin 31 is distant from the mortise 32. The use of the correct key allows under these conditions, the rotation of the rotor 1 only and the actuation of the bolt.

On the contrary, the forced rotation of the stator 2 by a false key or by another tool, causes the disc 23 to rotate, and consequently the boss 19 to escape from the notch 21 (Figure 7). The spring 25 therefore recalls the plate 22 which slides between the feet 24 perpendicular to the axis XX, so that the stud 31 engages in the notch 32. As a result, the rotor 1 and the stator 2 are secured for the duration of a complete revolution until the boss 19 meets the notch 21 and enters it, which allows it to push in the plate 22, which releases the pin 31 from the notch 32 by releasing the rotor 1 During the rotation of a single block of the rotor 1, the stator 2 and the parts 22, 23, 28, 9 and 10, the finger 10 rotates around the axis YY of the stator 2, and cannot therefore mesh with the latch notches.

It will be noted that, if the forced rotation of the stator 2 and of the rotor 1 comes from a wrong operation of a user with the right key (partial depression, then rotation of the key), the user can again open the lock normally after a full turn of all of these parts.

In the third embodiment illustrated in FIGS. 8 to 10, and applicable to collateral with pumps or to those whose rotor and stator are concentric, the amplitude of the rotational movement of the finger 10 for controlling the control is reduced or even canceled. bolt.

As in the previous embodiment, a disc 23 carrying a notch 21 is secured to the stator 2 by means of the screws 30, and the pawl 17 recalled by the spring 27 maintains the stator 2 in the normal position, disengageably. At disc 23 is fixed a guide 40 U-shaped rounded and projecting from the disc 23 on the side of the bolt. A circular plate 60 is housed inside the guide 40 coaxially with the rotor 1, which is accessible through a hole 33 of the disc 23. An assembly consisting of a washer 34, a spacer 35, a slide is fixed on the rotor 1 circular 36 sized to be able to slide inside the guide 40, and the plate 60, and this by means of an axial screw 37 passing through the washer 34, the spacer 35, an elongated diametrical lumen 38 of the slide 36, a hole central of the plate 60, the screw 37 being introduced into the hole 33 of the rotor 1. The plate 60 is provided with a lug 39 for guiding which can penetrate into a hole 41 of the rotor 1, to ensure the positioning of the assembly .

The plate 60 is equipped with two feet 42 projecting towards the slide 36 in the elongated lumen 38 from which they are introduced as well as. placed on either side of the feet 42, of stops 43 which engage in corresponding housings 44 formed in the slide 36 parallel to its lumen 38 on each side of the latter.

Two springs 45 are placed in the lateral housings 44 of the slide 36, bearing on the feet 43, and elastically urge the slide 36 towards the position of the latter where it is stopped by one of the stops 42 (FIG. 10), when the pawl 17 is released from the notch 21. The plate 9 for supporting the finger 10 is fixed to the slide 36 by means of spacers 46 making it possible to compensate for the thickness of the washer 34 and that of the head of the screw 37, these spacers 46 receiving screws 47 for fixing the plate 9 to the slide 36.

• En position d'attente (Figure 9); le cliquet 17 dont le bossage 19 est élargi latéralement, immobilise le disque 23 par son encoche 21, et en même temps appuie sur le coulisseau 36 en comprimant les ressorts 45, dont les extrémités opposées aux pieds saillants 43 sollicitent les parties terminales des logements 44 opposés auxdites butées 43, de manière que l'axe du coulisseau 36 soit confondu avec l'axe X-X du rotor 1. On voit que, sous l'action de la bonne clé, le mouvement du rotor 1 est transmis à ·la pièce 9 portant le doigt 10, poar l'intermédiaire du pied 39, des butées 43 et des tétons des guidage 42 entrainant en rotation le coulisseau 36, auquel est fixé le plateau 9.

The operation of this embodiment is the next :

• In the standby position (Figure 9); the pawl 17, the boss 19 of which is laterally widened, immobilizes the disc 23 by its notch 21, and at the same time presses on the slide 36 by compressing the springs 45, the ends of which opposite the projecting feet 43 stress the end portions of the housings 44 opposite to said stops 43, so that the axis of the slide 36 is coincident with the axis XX of the rotor 1. It can be seen that, under the action of the correct key, the movement of the rotor 1 is transmitted to · the part 9 carrying the finger 10, for the intermediary of the foot 39, stops 43 and guide pins 42 causing the slide 36 to rotate, to which the plate 9 is fixed.

In the event of a fraudulent operation, the disc 23 crosses the obstacle opposed by the boss 19 and rotates (Figure 10). The pawl 17 is held in the raised position by rubbing by its boss 19 on the disc 23, which releases the slider 36 which moves laterally under the action of the springs 45 by driving the plate 9, the finger 10 of which approaches this made of the axis of rotation XX and escapes the notches 11 'of the bolt (Figure 10).

In the case where the key is only correctly inserted after having started to rotate the stator 2, the rotor 1 remains integral with the stator 2 which cannot rotate between the lateral branches of the guide 31 (Figure 10).

The fourth embodiment of the lock illustrated in Figures 11 and 12, applicable to all securities to thwart fraudulent operations, allows to cause the longitudinal movement on its axis of the plate 9 supporting the finger 10 so as to move the finger 10 away from the dice plan placement of the bolt. In this embodiment, the disc 48 integral with the stator 2 has a central recess traversed by a guide 49 fixed concentrically with the rotor 1, and in which longitudinal grooves 51 are arranged. The guide 49 internally receives a part 52 provided with lateral lugs 53 engaged inside the grooves 51, so that the part 52 can slide axially in the guide 49. To the part 52 is fixed a plate 54 constituting a pulley of axis XX, and which carries the control finger 10 of the bolt . The part 52 can slide in the guide 49 longitudinally without the possibility of angular offset.

According to one feature, the invention provides means for automatically moving in axial translation the part 52 and consequently the finger 10 in the direction of the rotor 1, when as a result of an irregular attempt to open the lock, the stator 2 and the disc 48 is rotated with the rotor 1, and that the boss 19 of the pawl 17 comes out of its notch of the disc 48. In this example, these means consist of a plate 55 articulated on a support 56 fixed to the pin 6, for example by means of a screw 50 engaged in this support 56 and passing through the plate 55. The latter has in its middle part a recess 57 corresponding to the diameter of the pulley 54 measured at the bottom of the groove, the pulley 54 being inserted in this obviously. For this, it is made in two separate parts, or bie _' , the plate 55 is cut in an appropriate manner, as illustrated in Figure 13, where we see that it has the recess 57 communicating with the outside of the plate by a cutout 58 for passage of the pulley 54. Thus, when the plate 55 is articulated on the screw 50, and the pulley 54 is engaged in the recess central 57, the pulley 54 can be moved in translation by an angular movement of the plate 55. Finally, the latter is provided with a boss 59 capable of coming to bear on an associated lug 61 projecting from the disc 48 (Figure 11) , when the boss 19 of the pawl 17 is engaged in its notch 21.

When the bosses 59 and 61 are in contact, the rotation of the correct key causes, through the guide 49 and the part 52, the rotation of the pulley-plate 54, of which the finger 10 can be inserted in a notch 11 'of the bolt 11 and move the latter laterally (Figure 11). A spring 62 fixed on the one hand to the plug 6 and on the other hand to the end of the plate 55 opposite its articulation tends to resiliently return the plate 55 towards the plug 6. Thus, in normal operation of the lock, the return spring 62 remains tensioned while the bosses 59 and 61 are in contact.

In the event of rotation of the stator 2 with the rotor 1, the disc 48 also rotates, so that its lug 61 is released from the boss 59, and that the plate 55 is returned by the spring 62 towards the bolt 6 by axially driving the pulley 54 whose finger 10 is no longer long enough to reach the notch 11 'of the bolt 11 (Figure 12). At the same time, the boss 19 of the pawl 17 has come out of the notch 21. Thus the fraudulent opening of the lock is automatically prevented by longitudinal withdrawal of the finger 10.

In the case where the key is not correctly inserted until after having started to rotate the stator 2, the rotor can rotate indefinitely without the finger 10 can ever reach the notch of the bolt. Then simply remove the key in part and do turn the rotor-stator assembly until the pawl 17 engages in the notch 21 of the disc 48, then insert the key correctly to return to normal operation.

The fifth embodiment of the lock according to the invention will now be described, with reference to Figures 14 to 16.

The lock is provided with a disk 63 fixed coaxially to the stator .2 on the side of the bolt 6 facing the bolt, and with a hollow cylindrical cam 64 integral with the disk 63, in which several notches 65 are formed, the cam 64 being concentric to the rotor 1. A part 66 is slidably mounted axially in a guide 67 fixed to the end of the rotor 1 by screws such as 68, and is secured to a cam follower 69 carrying as many teeth 71 as the cam 64 comprises of notches 65. The number of teeth 71 and notches 65, as well as their position are such that there is penetration of teeth 71 in the notches 65 only for a single determined angular position corresponding to the waiting position security.

The plate 72 supporting the pin 10 for driving the bolt is integral with the cam follower 69, forming with the latter and the part 66, which can slide in the grooves 51 of the guide 67 by guide pins 53, a set monobloc movable in axial translation along the axis XX, when it rotates relative to the cam 64.

Finally, a plate 73 parallel to the plug 6, is pierced with a central orifice 74 allowing the passage of the support plate 72 of the finger 10. and is returned elastically to the plug 6 by tension springs 75. As in the previous embodiments, a pawl 17 carries a boss 19 which can be interlocked in a notch 21 of the disc 63.

At rest, the cam 64 and the cam follower 71 are nested one inside the other under the action of the plate 73 (FIG. 15), the teeth 71 being driven into the complementary notches 65. The rotation of the rotor 1 under the action of the right key causes the rotation of the cam follower 69 relative to the cam 64 immobilized by the pawl 17. The cam follower 69 can only rotate after having passed the notches 65, which causes its longitudinal displacement at the same time as that of the support plate 72 and therefore of the finger 10, which is thus advanced towards the bolt in which it can mesh. The angular position of the teeth 71 of the cam follower 69 is such that, apart from the initial position where the cam 64 and the cam follower 69 are nested, there are always during rotation at least two teeth 71 in contact with the periphery of the cam 64. In addition, these two teeth 71 must be substantially diametrically opposite, so as to favor the guiding of the part 66 in axial translation without rotation, in the guide 67, the insertion of which is relatively short to reduce the size of the lock.

In the event of fraudulent maneuvering, the rotation of the stator causes that of the cam 64 and the cam follower 69 which remain nested, so that the finger 10 retains its position in withdrawal, retracted with respect to the bolt, which it cannot operate. In the case where the key is not correctly inserted until after having started to rotate the stator, the two cams remain nested one inside the other, being held together by the restoring force of the springs 75, without causing the 'bolt drive. or no blockage of the mechanism.

The sixth embodiment of the lock according to the invention, illustrated in Figures 17 to 19, is applicable to collateral whose spring 1 and the stator 2 are eccentric, the pin 10 for driving the bolt moving longitudinally.

In this lock, the disc 76 in which is formed the notch 21 cooperating with the pawl 17, is fixed to a cylindrical part 77 extending in the cover 3, and secured in rotation with the stator 2 by screws 83. A axis 78 passes through the disc 76 as well as a housing of the part 77, this axis 78 being coaxial with the axis XX of the rotor 1 and comprising an end portion 78a slidably mounted inside the rotor 1. This part 78a therefore constitutes a slide having the profile 78b of the key 8, and therefore can only move longitudinally in the rotor 1, without angular displacement relative thereto. The end of the axis 78 opposite the slide 78a carries the support plate 79 of the control finger 10. The rotor 1 is retained inside the stator 2 by a flange 81 at the inlet end, and by a circlip 82 at its other end. A helical compression spring 84, mounted coaxially with the axis 78, bears on the disc 76 and exerts a thrust on a flange 85 secured to the axis 78. Therefore, under the thrust of the spring 84, the end 78a is slidably engaged in the rotor 1 until the flange 85 abuts against the end of the rotor, the support plate 79 then occupying position 79a, retracted with respect to the bolt, and shown in broken lines. Finally, the plate 79 is provided with a flange 86 coaxial with the axis XX, for example of circular shape, and a screen 87 is kept fixed and parallel to the funnel 6, at a determined spacing from the latter, by support spacers 88. The screen 87 is pierced with a hole 89, circular if the flange 86 is circular, and with a diameter allowing the passage of the latter on either side of the screen 87.

In normal operation, the correct key 8 pushes the assembly formed by the slide 78a, the axis 78, the plate 79 and the finger 10, by compressing the spring 84, and this from the rest position of the plate 79a, to the position in solid lines, in which the finger 10 is placed on the path of the bolt and can actuate it. In the absence of a key, the spring 84 brings the assembly back, and the finger 10 is found out of reach of the bolt.

In the event of forced rotation of the stator 2, the slide 78a is not pushed, so that the finger 10 is kept out of the reach of the bolt. When using a blank key not cut, but the profile of the correct key 8, the slide 78a is pushed, as well as the plate 79 and the finger 10. But the rotor 1 and the stator 2 having remained integral since the false key is not cut, rotate together, so that the plate 79 rotates around the axis YY of the stator (which is off-center with respect to the rotor 1), and not around the axis XX of the rotor. This consequently reduces the amplitude of the rotary movement of the finger 10, which is insufficient to allow the latter to reach a notch 11 'of the bolt, as in the case of FIG. 1.

In the event of stator 2 starting to rotate due to insufficient insertion of the key 8, then insertion during rotation, there would be a risk of blocking the mechanism by faulty engagement of the finger 10 in a notch 11 'of the bolt. This risk is precisely eliminated thanks to the collar 86 and the screen 87. In fact, in normal use with the correct key 8, the collar 86 crosses the screen 87 through the hole 89 during its translational movement (Figure 18 ). On the other hand, in the event of rotation of the stator 2, the flange 86 rotates around the axis YY, and is therefore first off-center, while remaining in its initial retracted position (corresponding to the position 79a of the plate), and this until the key has been fully pressed. The flange 86. is therefore in the position shown in Figure 19, offset from the opening 89, so that when the key is fully depressed, the axis 78 pushes the flange 86 into abutment against the screen 87 , the axis XX of the rotor 1 and of the collar 86 having described an arc of the circle 90. The screen 87 therefore prevents the key from being fully depressed, which makes it possible to complete the turn at the end of which key 8 can be pressed, the safety can then operate normally.

Referring to Figures 20 to 23, the safety block is constituted by the rotor 1 and the stator 2. The end of the rotor 1 is extended to pass through the orifice made to its diameter in the bottom of a sliding sleeve 100 on the stator 2. The sleeve 100 is placed inside a cover 101 which is free to rotate in a base 102 secured to the plug 6. The front face of the sleeve 100 is hollowed out in the form of a cone. The front end of the outer cover 101 has a rim 103 internally hollowed out in the shape of a cone. The outer part of the rotor 1 carries two rods 104. The sleeve 100 carries a notch 105 formed in the thickness of its front face, opposite the two rods 104. Normally, the sleeve 100 is pressed against the front face of the cover 101 at by means of two springs 106 housed in blind holes 107 made in the stator.

Under the action of the opening key 8, the rotor 1 normally turns in the stator 2. With a false key or any tool, the rotor remains integral with the stator as described above. Assuming the cover 101 immobilized and the sleeve 100 also immobilized by wedging between its end and the rim 103 of the cover, the rods 104 penetrate into the notches 105 so that the rotor and the stator, secured, prevent palpation.

The jamming of the sleeve 100 between its end and the flange 103 of the cover is made very difficult because of the flared shape of the available space.

Figure 24 shows a front view of the outer end of the cover 101 which must be fixed on the lock pin and carrying a notch 112 made in the flange facing the key entry slot. The key 8 carries a stud 113. The introduction of the opening key 8 is possible since the stud 113 can pass into the notch 112 (FIG. 25). If the user engages the opening key incompletely in the rotor, then turns the key (Figure 26), he can no longer fully engage it during rotation, the pin 113 abuts against the edge 20 of the cover , which makes impossible the false maneuver described above.

To prevent immobilization of the cover 101 by drilling obliquely through the door, an external sleeve 108 made of imperceptible metal is added (FIG. 27). A front plate 109 is fixed according to known means by balusters 110 and screws 111.

Figure 28 shows the location of an imperforable grain 114 placed longitudinally opposite the junction line of the pins. Figure 29 shows a variant of a similar grain 115 placed transversely. Figure 28 shows, in addition, two possible locations 116 for containing tin solder or a hot-melt adhesive melting under the action of a torch attack to make the rotor and the stator integral.

Claims (18)

1 - Safety lock comprising a rotor (1) mounted in a stator (2) housed in a cover (3) fixed to a catch (6), the rotor (1) having a housing (16) capable of receiving a key ( 8) and being provided, at its end opposite the entry opening of the key, with a part (9, 54, 72, 79) integral with the rotor (1) and provided with a finger (10) intended to drive a bolt (11) when the rotor (1) and said part are rotated by the key, characterized in that it comprises means for rotating the stator (2) integrally with the rotor (1) under the action of a false key or other tool in order to fraudulently open the lock, and to thereby trigger a displacement of the axis of rotation of the finger (10) integral with the rotor (1) or a withdrawal in axial translation of this finger relative to the bolt (11), in order to prevent any actuation of the bolt (11) by introduction of the false key or other tool. 2 - Lock according to claim 1, characterized in that it comprises a device capable of maintaining the stator (2) fixed in rotation when the rotor (1) is driven in rotation by the normal key of the lock, and of releasing the stator (2) in rotation under the action of the false key or other tool, such as a ball (4) housed in the wall of the cover (3), and held in abutment in a notch (4a) of the stator (2 ) by a spring (5) disposed in a transverse tubular projection (3a) of the cover (3). 3 - Lock according to one of claims 1 and 2, characterized in that it is provided with a pawl (17) articulated on the bolt (6) on the side of the latter opposite the stator (2) and the rotor ( 1), provided with a boss (19) capable of coming to engage in a complementary notch (21) formed in a disc (23) fixed to the stator (2) coaxially with the latter, and on which a plate (22) can slide under the action of at least one elastic return member (25) when the boss (19) of the pawl (17) is released from the corresponding notch (21), in which it tends to be normally held by a return spring (27) of the pawl (17), and the sliding plate (22) has a central recess (22a) for housing a member (28) fixed to the rotor (1), this member (28) and the edge facing the recess f22a) being provided with means for securing the member and of the plate (22) rotating in one piece with the rotor (1), the stator (2) and the disc (23) when the boss (19) of the pawl (17) comes out of the notch (21 ) following an attempt to open the lock by an organ other than the normal key. 4 - Lock according to claim 3, characterized in that said means for securing the part (9) carrying the finger (10) with the plate (22) consist of a stud (31) arranged on the edge of the recess (22a ) of the plate (22) and a mortise (32) combined with the aforementioned member (28) or vice versa. 5 - Lock according to claim 1, characterized in that it comprises a disc (23) fixed to the stator (2) on the same side of the lock (6) as the part (9) carrying the finger (10) for actuating the bolt (11), a guide (40) U-shaped and failing the disc (23) to which it is fixed on the side of the bolt, a circular plate (60) housed in this guide (40) coaxially with the rotor (1) and integral with the latter, a slide (36) coaxial with the plate (60) and capable of sliding thereon perpendicular to the general axis of the lock under the action of organs ticks (45), this slide (36) being secured to the support (9) of the finger (10) for actuating the bolt, and the disc (23) has a peripheral notch (21) in which can engage a protruding boss (19) of a pawl (17) articulated on the plug (6) and applied elastically towards the disc (23) by a return spring (27). so that when the boss (19) is in the notch (21), it maintains at the bottom of the guide (40) against the opposing stress of the aforementioned elastic members (45), the assembly formed by the slide (36) and the support (9) of the finger (10) and that when the boss (19) comes out of its notch (21) as a result of the use of a false key, said elastic members (45) move the slide (36 ) and the support (9) of the finger (10) until these parts are stopped by a foot (42) projecting from the plate (60), the assembly constituted by the plate (60), the slide (36) and the support (9) of the finger (10) then being made integral with the disc (23) and the stator (2) in rotation about the axis (XX) of the latter. 6 - Lock according to claim 5, characterized in that the slide (36) has a light (38) perpendicular to the axis (XX) of the lock and in which can slide two stops formed by projecting feet (42) of the plate (60), as well as housings (44) receiving the elastic members (45) for returning the slide (36) and the abutments (43) supporting these, projecting from the plate (60) from which they are united. 7 - Lock according to claim 1, characterized in that: - The stator (2) is integral with a disc (48) placed on the side of the bolt (6) facing the bolt (11) and which has a notch (21) into which a boss (19) can be latched integral with a pawl (17) articulated on the bolt (6) and resiliently urged against the disc (48); - The disc (48) has a central recess crossed by a guide (49) fixed to the rotor (1) and this guide internally receives a part (52) sliding axially and carrying the finger (10) for controlling the bolt; - And means are provided for automatically moving in translation in the guide (49) towards the rotor (1) the part (52) carrying the finger (10) when as a result of an irregular attempt to open the lock, the stator (2) and the disc (48) are rotated with the rotor (1) and the boss (19) comes out of its notch (21). 8 - Lock according to claim 7, characterized in that said means for translational control of the part (52) carrying the finger (10) consist of a plate (55) articulated on the wall (6), in which is arranged a recess (57) for receiving the part (54) for supporting the finger (10), produced so as to secure this part (54) in axial translation with the plate (55), the end of which is elastically urged towards the pin and rests on a lug (61) integral with the disc (48), so that if the disc (48) and the stator (2) are rotated and the boss (19) of the pawl (17) s' escapes from the notch (21), the end of the plate (55) is released from the lug (61) and is folded towards the bolt (6) under the action of an elastic member (62) fixed to the latter, which causes the axial sliding in the guide (49) of the part (52) carrying the finger (10) which is then put out of reach of the bolt (11). 9 - Lock according to claim 1, characterized in that it comprises: - A disc (63) fixed coaxially to the stator on the side of the spindle (6) facing the bolt, and a hollow cylindrical cam (64) integral with the disc (63) in which notches (65) are formed; - A part (66) slidingly mounted axially in a guide (67) fixed to the end of the rotor (1) and secured to a cam follower (69) provided with teeth (71) complementary to the notches (65), the support (72) of the bolt control finger (10) also being integral with this cam follower (69) by forming with the latter and the sliding part (66) a one-piece assembly displaceable in axial translation when it rotates relative to the cam (64); - A plate (73) parallel to the plug (6) pierced with a central orifice (74) for receiving the support (72) of the finger (10) and resiliently biased towards the plug (6) by tension springs (75) ; - a pawl (17) articulated on the side of the bolt (6) facing the bolt (11), carrying a boss (19) capable of snapping into a corresponding notch (21) of the disc (63), and recalled elastically towards the disc (63) by a spring (27) fixed to the housing (6); - the cam (64) and the cam follower (69) being nested one inside the other at rest under the action of the plate (73) and the rotation of the rotor (1) with a normal key causing that of the cam follower (69) which then moves away from the cam (64) and moves the finger (10) axially towards the bolt to its driving position of the latter, while in the event of an irregular attempt d opening of the lock, the rotation of the stator (2) causes that of the disc (63) and of the cam (64) so that the latter and the cam follower (69) remain nested and that the finger (10) remains in the same axial position, in withdrawal from the bolt that it cannot entrain. 10 - Lock according to claim 1, characterized in that it comprises: - a pawl (17) articulated on the side of the bolt (6) turned towards the bolt, carrying a boss (19) capable of snapping into a corresponding notch (21) of a disc (76) fixed to a cylindrical part (77) extending in the cover (3) and secured in rotation with the stator (2): - an axis (78) passing through the disc and the cylindrical part (77) and one end of which (78a) is slidably engaged in the rotor (1) coaxially with the latter, while its opposite end carries the finger (10) bolt drive (11); - Means for elastically biasing towards the rotor (1) the axis (78) and the finger (10) constituted for example by a flange (85) integral with the axis (78) passing through the disc (76) placed at the interior of the cylindrical part (77) integral with the stator (2), and elastically pushed together with the axis (78) towards the rotor (2) by an elastic member (84) coaxial with said axis and bearing on the disc ( 76) so as to normally keep the finger (10) set back relative to the bolt. 11 - Lock according to claim 10, characterized in that it comprises a screen (87) kept fixed and parallel to the lock at a determined distance from the latter, pierced with a central opening (89) dimensioned to be slightly larger a coaxial flange (86) equipping the support (79) with the finger (10) in order to authorize, from the retracted position of the flange (86) and the finger (10), the axial displacement of this flange (86) through the central opening (89) and the finger (10) towards the bolt in the event of normal opening of the lock, and to oppose this displacement in the event of forced rotation of the stator (2) consecutive insufficient insertion of a suitable key followed by full depression during rotation with locking, the screen (87) then forming an axial stop for the flange (86) and the finger (10) which turn in solidarity with the stator (2) around the axis (YY) of the latter, which makes it possible to complete the turn at the end of which the key can be pressed normally and the lock open. 12 - Lock according to one of claims 1 to 11, characterized in that a sleeve (100) sliding elastically is mounted on said stator and carries at least one notch (105) cooperating with a rod (104) integral with the rotor ( 1). 13 - Lock according to claim 12, characterized in that the cover (101) is mounted to rotate freely in a base (102) integral with the bolt (6). 14 - Lock according to claim 13, characterized in that the front end of the cover (101) has a flange (103) hollowed out internally in the shape of a cone. 15 - Lock according to one of claims there 14, characterized in that the cover (101) has a notch (112) facing the key entry channel and the key (8) carries a stud (113) cooperating with said notch (112) at the end of the insertion of the key (8) in the channel. 16 - Lock according to one of claims 1 to 15, characterized in that it comprises an outer sleeve (108) of imperceptible metal, and an imperceptible plate (109) surrounds said cover (3, 101). 17 - Lock according to one of claims 1 to 16, characterized in that it comprises a grain (114) imperforable facing the junction line of the pins. 18 - Lock according to one of claims 1 to 17, characterized in that it comprises at least one housing (116) containing a heat-fusible material to secure the rotor (1) and the stator (2) in the event of blowtorch attack.

Images