EP0370893B1 - Protection device for cylinder locks - Google Patents

Protection device for cylinder locks Download PDF

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Publication number
EP0370893B1
EP0370893B1 EP89403204A EP89403204A EP0370893B1 EP 0370893 B1 EP0370893 B1 EP 0370893B1 EP 89403204 A EP89403204 A EP 89403204A EP 89403204 A EP89403204 A EP 89403204A EP 0370893 B1 EP0370893 B1 EP 0370893B1
Authority
EP
European Patent Office
Prior art keywords
door
plate
cylinder
disc
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89403204A
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German (de)
French (fr)
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EP0370893A1 (en
Inventor
Pierre Robert Paul Fredon
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CAVERS Ets
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CAVERS Ets
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Publication date
Application filed by CAVERS Ets filed Critical CAVERS Ets
Priority to AT89403204T priority Critical patent/ATE103030T1/en
Publication of EP0370893A1 publication Critical patent/EP0370893A1/en
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Publication of EP0370893B1 publication Critical patent/EP0370893B1/en
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    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B15/00—Other details of locks; Parts for engagement by bolts of fastening devices
    • E05B15/16—Use of special materials for parts of locks
    • E05B15/1614—Use of special materials for parts of locks of hard materials, to prevent drilling
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B15/00—Other details of locks; Parts for engagement by bolts of fastening devices
    • E05B15/16—Use of special materials for parts of locks
    • E05B15/1614—Use of special materials for parts of locks of hard materials, to prevent drilling
    • E05B2015/1628—Free-rotating protecting covers or discs

Definitions

  • the present invention relates to a protection device for a cylinder lock mechanism and, more particularly, to such a device designed to adapt to such existing mechanisms, without modification thereof.
  • Cylinder lock mechanisms such as locks, in particular those fixed on entry doors to residential premises, are frequently subjected to attack by burglars.
  • These locks ordinarily comprise a cylinder or barrel passing through the door and fixed by screws or other fixing means on a support plate inside the housing of the lock mechanism.
  • burglars commonly use the process which consists in blowing up the cylinder by shearing or tearing off the fixing screws, so as to be able to access the latch mechanism.
  • the necessary shearing or tearing is obtained, for example, by applying a torque to the cylinder using pliers. This process can only be used if the cylinder protrudes sufficiently from the surface of the door.
  • a second method consists in forcibly introducing a member screwing into the hole of the cylinder to wedge this member in this hole and then applying an axial tensile force to the cylinder, by means of this member, to break and / or tear off the screws. fixing the cylinder.
  • a third method consists in tearing off the bolt by applying axial percussion on the cylinder.
  • a fourth method of aggression consists in attacking the bolt by drilling the cylinder or the organs of the lock.
  • a lock has been designed, the projecting cylinder of which is covered with a reinforced fixed ring, a washer closing the end of the ring, facing the free end of the cylinder.
  • the washer is pierced with a slot for the passage of the lock key and it is coupled in rotation to the rotating part of the cylinder by a stud so that a key passed through the slot of the washer and into the hole in the cylinder. can turn. If we now try to force the lock by inserting a screw member into the slot in the washer, the torque applied by the screw member shears the stud at the end of its travel of the rotating part of the cylinder.
  • the washer then turns mad in the fixed ring and it is not possible to engage with the cylinder or to apply axial traction to it, like a corkscrew. However, it is still possible to shear the cylinder fixing screws by axial percussion of the latter.
  • Document US-A-3,083,563 also discloses a lock protection device placed behind a door to be protected and comprising a washer which, under the effect of percussion, is applied against the end of a lock cylinder secured to a plate fixed to the door by bolts. The impact forces are thus transmitted to the door by the heads of these bolts, the surface of which is small, which does not allow effective resistance to these impact forces to be ensured.
  • Document CH-A-667 689 is also known, having served as a basis for the preamble of claim 1, a protective assembly for cylinder lock passing through a door, using a rotating part covering the projecting end. of the cylinder. It is possible to block this piece by axial percussion which allows to attack then the lock by drilling.
  • the present invention therefore aims to provide a protection device for cylinder lock mechanism which is adaptable to any existing mechanism, without modification thereof.
  • the present invention also aims to achieve such a device designed to withstand the attacks to which the cylinder lock mechanisms are subjected, and in particular to the four types of attack mentioned above.
  • a protection device for a cylinder lock mechanism arranged to pass through a door on which the mechanism is mounted comprising a plate designed to be fixed. on the door so as to protect the free end of the cylinder which opens from one face of the door, a disc-shaped part pierced with an opening for the passage of a key and rotatably mounted in a housing formed in the thickness of the plate opposite the free end of the cylinder, this housing opening on the face of the plate which rests on the door, the bottom of the housing being pierced to allow the insertion of the key of the mechanism in the cylinder, through the opening of the part, characterized in that the diameter of the disc-shaped part is greater than that of the cylinder and in that this part is freely flush with the surface of the plate which is turn e towards the door, so as to increase the surface according to which percussive forces applied to the workpiece (2) are transmitted to the door.
  • the device comprises at least one counterplate inserted between the plate and the door to fill the projection of the cylinder on the door.
  • this plate is hollowed out with a recess designed to receive a protective plate, the latter being flush with the surface of the plate which faces the door.
  • the device which essentially comprises a plate 1 of generally rectangular shape in the embodiment shown, and a part 2 which, preferably, follows the shape a disc pierced with an opening 15 in the form of a diametrical slot or any other form allowing the insertion of a key.
  • the device consisting of the plate 1 and the disc 2 is designed to be mounted on one face of a door 3 equipped with a cylinder lock mechanism such as a lock, the housing of which is schematically represented in 4, with its bolt 5 and its control button 5 ′, on the other face of the door.
  • a cylinder 6 projects from the housing 4 to pass through the door.
  • the base 7 of the cylinder is fixed by screws or other fixing means on a support plate (not shown) inside the housing of the lock 4. It is these fixing means that must be protected from attack by burglars which act on the cylinder 6 to break them by applying shearing and / or tearing forces to them.
  • the plate 1 made for example of cast iron or of hardened and / or case-hardened steel so as to have a high surface hardness resistant to burglars' tools, has two square holes 8, 9 which cooperate with two bolts 10, 11 to blocking heads complementary to these holes, for fixing the plate to the door 3. Bores 8 ′, 9 ′ hollowed out in the plate 1 concentrically with the holes 8, 9 and in addition to the heads of the bolts prevent the engagement of a tool between the head and the plate.
  • one or more counterplates 12 can be inserted between the plate 1 and the door 3 to catch up with the projection of the cylinder 6, on the face 13 of the door 3 opposite to that which receives the housing of the lock.
  • the hole drilled in the counterplate for the passage of the cylinder may advantageously be of smaller area than that of the disc 2 placed opposite, to reinforce the resistance to sinking by percussion of the cylinder.
  • a housing 14 is formed in the thickness of the plate 1, to receive the disc 2 in rotation.
  • the plate 1 is mounted on the door 3 in a position such that the axis of the disc 2 is substantially collinear with that of the rotating part of the cylinder 6.
  • the housing 14 is circular, of diameter and thickness conforming to those of the disc, so that the latter can rotate freely in this housing. This free rotation is improved if the disc bears on the counterplate 12, as indicated above.
  • the bottom of the housing 14 is pierced with a flared hole 16 which gives access to the slot 15 of the disc 2, from the external surface of the plate 1.
  • a key can be introduced into the cylinder 6, through the hole 16 and the slot 15 of the disc 2.
  • the diameter of the disc 2 is substantially greater than that of the cylinder. Thanks to this arrangement, the resistance to axial percussion forces applied along the axis of arrow F is improved by the fact that these forces are collected by an area equal to that of the disc 2, much greater than that of the cross section of the cylinder 6.
  • the hole 16, circular, is flared outward to facilitate the insertion of the key into the cylinder, through the slot 15 of the disc 2 which is applied to the end of the cylinder where the key is to be inserted.
  • the increased surface of the disc 2 gives the assembly better resistance to axial percussion, and therefore to tearing and / or shearing forces.
  • the disc 2 which turns crazy, prevents the insertion and blocking in the cylinder of a screwing tool.
  • the tool hangs in the slot 15 of the disc and rotates with it without being able to catch on the cylinder. Any axial traction on the cylinder using such a tool is then prohibited.
  • the device according to the invention successfully opposes the four main attacks mentioned in the preamble.
  • this result is achieved with means (plate 1, disc 2, bolts 10, 11) which can be mounted on any commercially available cylinder lock mechanism already installed without any disassembly, adaptation or other modification of it.
  • This protection device thus has a universal character.
  • the device according to the invention can also be incorporated in a lock mechanism provided with means designed to cooperate with this device, such as for example support plates projecting from the mechanism housing and pierced with holes for the passage of bolts 10, 11. Such support plates strengthen the solidity of the structure.
  • the plate 1 can also be pierced with a hole for the passage of a square for the bolt control handle.
  • the manufacture of the slotted disc 2 can be facilitated by making and mounting in the housing 14 two symmetrical half-discs indented on a diameter and reconstituting the disc 2 together, each half-disc conforming to half of the disc 2 which is on one side or the other of the plane of symmetry of the diametral slot drilled in this disc.
  • the plate 1 can be dimensioned so as to have a sufficient surface to fully protect the latch placed to the right of this plate, on the other face of the door. It can be dressed with a hood or other decorative covering.
  • FIG. 3 a variant of the device according to the invention.
  • the same reference numeral designates identical or similar elements or members.
  • the device of FIG. 3 essentially differs from the device of FIGS. 1 and 2 by the presence of a protective plate 17 housed in a recess 18 formed in the face of the plate 1 which comes opposite the door 3.
  • the protective plate is flush with the surface of the plate 1 and comes to bear on the counterplate 12 possibly inserted to absorb the projection of the cylinder 6 on the face 13 of the door.
  • the protective plate 17 can then cooperate itself with the absorption of this projection, as shown in FIG. 3.
  • the protective plate 17 is substantially coextensive with the plate 1. It is made of a very hard special manganese steel, such as a Z 120 M12 steel, so as to protect the attack latch 4 by drilling. It also strengthens the door 3 by increasing the surface thereof which collects a percussion force possibly applied to the disc 2 during an attack. The resistance of the assembly is thereby improved.
  • the plate 1 of the embodiment of Figure 3 has internally threaded sockets 19, 19 'designed to complement each other in holes drilled in the door.
  • the device is then fixed on this using bolts 20, 20 ′ passing through holes 21, 21 ′ respectively, from the inside of the door to be screwed into the sockets 19, 19 ′ of plate 1.
  • the head of the bolts being accessible only from inside the room closed by the door, the security of the device according to the invention is reinforced.
  • the disc 2 could rotate in the housing 14 with a clearance making it possible to adapt the device to errors in centering the holes to be made in the door for fixing the device.
  • such a play causes vibrations of the disc in the event of attack thereof with the drill, vibrations which make the attack more difficult.
  • the lock can be mounted on a support plate which s then applies against the inside of the door.
  • the straight slot 15 of the disc 2 could also be replaced by a hole of different shape, circular for example, to adapt to non-flat keys.
  • the invention is not limited to the embodiments described and shown which have been given only by way of example. On the contrary, it extends to any cylinder lock mechanism equipped with means designed to cooperate with the device according to the invention, the mechanism / device assembly then constituting a whole.

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  • Securing Of Glass Panes Or The Like (AREA)
  • Lock And Its Accessories (AREA)
  • Fluid-Damping Devices (AREA)
  • Soil Working Implements (AREA)
  • Actuator (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

The device comprises a plate (1) and a disc (2) freely rotatable in a receptacle (14) formed in the thickness of the plate (1) at the rear of a hole (16) opening into the bottom of the receptacle. A key can be inserted into the cylinder (6) of the lock via the hole (16) and a slot (15) made in the disc (2). The plate (1) and the disc (2) protect the cylinder (6) against attempts to break in by means of axial forces or torques exerted on the cylinder. The invention is used for protecting cylinder-lock mechanisms already installed. <IMAGE>

Description

La présente invention est relative à un dispositif de protection pour mécanisme de serrure à cylindre et, plus particulièrement, à un tel dispositif conçu pour s'adapter à de tels mécanismes existants, sans modification de ceux-ci.The present invention relates to a protection device for a cylinder lock mechanism and, more particularly, to such a device designed to adapt to such existing mechanisms, without modification thereof.

Les mécanismes de serrure à cylindre tels que les verrous, notamment ceux fixés sur des portes d'entrée de locaux d'habitation, sont fréquemment soumis aux agressions des cambrioleurs. Ces verrous comportent ordinairement un cylindre ou barillet traversant la porte et fixé par des vis ou autres moyens de fixation sur une plaque de support intérieure au boîtier du mécanisme du verrou. Pour ouvrir la porte, les cambrioleurs utilisent couramment le procédé qui consiste à faire sauter le cylindre par cisaillement ou arrachement des vis de fixation, de manière à pouvoir accéder au mécanisme du verrou. Le cisaillement ou l'arrachement nécessaire est obtenu, par exemple, en appliquant un couple de rotation au cylindre à l'aide d'une pince. Ce procédé n'est utilisable que si le cylindre déborde suffisamment de la surface de la porte. Un deuxième procédé consiste à introduire à force un organe vissant dans le trou du cylindre pour coincer cet organe dans ce trou et ensuite appliquer une force de traction axiale au cylindre, par l'intermédiaire de cet organe, pour casser et/ou arracher les vis de fixation du cylindre. Un troisième procédé consiste à arracher le verrou en appliquant des percussions axiales sur le cylindre. Un quatrième procédé d'agression consiste à attaquer le verrou par perçage du cylindre ou des organes de la serrure.Cylinder lock mechanisms such as locks, in particular those fixed on entry doors to residential premises, are frequently subjected to attack by burglars. These locks ordinarily comprise a cylinder or barrel passing through the door and fixed by screws or other fixing means on a support plate inside the housing of the lock mechanism. To open the door, burglars commonly use the process which consists in blowing up the cylinder by shearing or tearing off the fixing screws, so as to be able to access the latch mechanism. The necessary shearing or tearing is obtained, for example, by applying a torque to the cylinder using pliers. This process can only be used if the cylinder protrudes sufficiently from the surface of the door. A second method consists in forcibly introducing a member screwing into the hole of the cylinder to wedge this member in this hole and then applying an axial tensile force to the cylinder, by means of this member, to break and / or tear off the screws. fixing the cylinder. A third method consists in tearing off the bolt by applying axial percussion on the cylinder. A fourth method of aggression consists in attacking the bolt by drilling the cylinder or the organs of the lock.

Pour résister à ces diverses agressions on a conçu des verrous dont le cylindre, quand celui-ci déborde de la porte, supporte une bague externe montée à rotation sur ce cylindre. Ainsi, on ne peut cisailler les vis de fixation du cylindre en appliquant un couple sur cette bague, qui tourne folle sur le cylindre. On a aussi proposé une plaque de protection qui se fixe sur la porte par-dessus l'extrémité du cylindre et qui présente un renflement tronconique au niveau de ce cylindre pour empêcher que l'on puisse accéder à l'extrémité en saillie du cylindre.To resist these various attacks, locks have been designed, the cylinder of which, when the latter extends beyond the door, supports an external ring rotatably mounted on this cylinder. Thus, one cannot shear the cylinder fixing screws by applying a torque on this ring, which turns mad on the cylinder. We also proposed a protection plate which is fixed on the door over the end of the cylinder and which has a frustoconical bulge at the level of this cylinder to prevent access to the projecting end of the cylinder.

Ces protections sont inefficaces contre les efforts axiaux. Pour résister à ceux-ci, on a conçu un verrou dont le cylindre en saillie est recouvert d'une bague fixe renforcée, une rondelle fermant l'extrémité de la bague, en regard de l'extrémité libre du cylindre. La rondelle est percée d'une fente pour le passage de la clé du verrou et elle est couplée en rotation à la pièce tournante du cylindre par un téton de manière qu'une clé passée dans la fente de la rondelle et dans le trou du cylindre puisse tourner. Si on essaie maintenant de forcer le verrou en introduisant un organe vissant dans la fente de la rondelle, le couple appliqué par l'organe vissant cisaille le téton en bout de course de la pièce tournante du cylindre. La rondelle tourne alors folle dans la bague fixe et il n'est pas possible de venir en prise avec le cylindre ni de lui appliquer une traction axiale, à la manière d'un tire-bouchon. Cependant il est toujours possible de cisailler les vis de fixation du cylindre par des percussions axiales de celui-ci.These protections are ineffective against axial forces. To resist these, a lock has been designed, the projecting cylinder of which is covered with a reinforced fixed ring, a washer closing the end of the ring, facing the free end of the cylinder. The washer is pierced with a slot for the passage of the lock key and it is coupled in rotation to the rotating part of the cylinder by a stud so that a key passed through the slot of the washer and into the hole in the cylinder. can turn. If we now try to force the lock by inserting a screw member into the slot in the washer, the torque applied by the screw member shears the stud at the end of its travel of the rotating part of the cylinder. The washer then turns mad in the fixed ring and it is not possible to engage with the cylinder or to apply axial traction to it, like a corkscrew. However, it is still possible to shear the cylinder fixing screws by axial percussion of the latter.

On connaît aussi du document US-A-3.083.563 un dispositif de protection de serrure placé derrière une porte à protéger et comportant une rondelle qui, sous l'effet de percussions, s'applique contre l'extrémité d'un cylindre de serrure solidaire d'une plaque fixée à la porte par des boulons. Les efforts de percussion sont ainsi transmis à la porte par les têtes de ces boulons dont la surface est faible, ce qui ne permet pas d'assurer une résistance efficace à ces efforts de percussion.Document US-A-3,083,563 also discloses a lock protection device placed behind a door to be protected and comprising a washer which, under the effect of percussion, is applied against the end of a lock cylinder secured to a plate fixed to the door by bolts. The impact forces are thus transmitted to the door by the heads of these bolts, the surface of which is small, which does not allow effective resistance to these impact forces to be ensured.

On connaît encore du document CH-A-667 689, ayant servi de base pour le preambule de la revendication 1, un montage de protection pour serrure à cylindre traversant une porte, à l'aide d'une pièce rotative recouvrant l'extrémité débordante du cylindre. Il est possible de bloquer cette pièce par des percussions axiales ce qui permet d'attaquer ensuite la serrure par perçage.Document CH-A-667 689 is also known, having served as a basis for the preamble of claim 1, a protective assembly for cylinder lock passing through a door, using a rotating part covering the projecting end. of the cylinder. It is possible to block this piece by axial percussion which allows to attack then the lock by drilling.

Outre les insuffisances mentionnées ci-dessus, tous ces moyens de protection connus présentent l'inconvénient de n'être pas adaptables à des mécanismes de serrure à cylindre existants et/ou d'être inefficaces à l'égard d'au moins un des quatre types d'efforts répertoriés ci-dessus (percussion, traction, couple de rotation, perçage).In addition to the shortcomings mentioned above, all of these known protection means have the drawback of not being adaptable to existing cylinder lock mechanisms and / or of being ineffective with regard to at least one of the four types of forces listed above (percussion, traction, torque, drilling).

La présente invention a donc pour but de réaliser un dispositif de protection pour mécanisme de serrure à cylindre qui soit adaptable à tout mécanisme existant, sans modification de celui-ci.The present invention therefore aims to provide a protection device for cylinder lock mechanism which is adaptable to any existing mechanism, without modification thereof.

La présente invention a aussi pour but de réaliser un tel dispositif conçu pour résister aux agressions auxquelles sont soumis les mécanismes de serrure à cylindre, et notamment aux quatre type d'agressions précitées.The present invention also aims to achieve such a device designed to withstand the attacks to which the cylinder lock mechanisms are subjected, and in particular to the four types of attack mentioned above.

On atteint ces buts de l'invention, ainsi que d'autres qui apparaîtront dans la suite, avec un dispositif de protection pour mécanisme de serrure à cylindre agencé pour traverser une porte sur laquelle est monté le mécanisme, comprenant une plaque conçue pour être fixée sur la porte de manière à protéger l'extrémité libre du cylindre qui débouche d'une face de la porte, une pièce en forme de disque et percée d'une ouverture pour le passage d'une clé et montée à rotation dans un logement formé dans l'épaisseur de la plaque en face de l'extrémité libre du cylindre, ce logement s'ouvrant sur la face de la plaque qui s'appuie sur la porte, le fond du logement étant percé pour autoriser l'insertion de la clé du mécanisme dans le cylindre, à travers l'ouverture de la pièce, caractérisé en ce que le diamètre de la pièce en forme de disque est supérieur à celui du cylindre et en ce que cette pièce affleure librement à la surface de la plaque qui est tournée vers la porte, de manière à accroître la surface suivant laquelle des efforts de percussion appliqués à la pièce (2) sont transmis à la porte.These objects of the invention are achieved, as well as others which will appear below, with a protection device for a cylinder lock mechanism arranged to pass through a door on which the mechanism is mounted, comprising a plate designed to be fixed. on the door so as to protect the free end of the cylinder which opens from one face of the door, a disc-shaped part pierced with an opening for the passage of a key and rotatably mounted in a housing formed in the thickness of the plate opposite the free end of the cylinder, this housing opening on the face of the plate which rests on the door, the bottom of the housing being pierced to allow the insertion of the key of the mechanism in the cylinder, through the opening of the part, characterized in that the diameter of the disc-shaped part is greater than that of the cylinder and in that this part is freely flush with the surface of the plate which is turn e towards the door, so as to increase the surface according to which percussive forces applied to the workpiece (2) are transmitted to the door.

Suivant un mode de réalisation préféré de l'invention, le dispositif comprend au moins une contreplaque insérée entre la plaque et la porte pour combler la saillie du cylindre sur la porte.According to a preferred embodiment of the invention, the device comprises at least one counterplate inserted between the plate and the door to fill the projection of the cylinder on the door.

Suivant une caractéristique de la présente invention, cette plaque est creusée d'un évidement conçu pour recevoir une plaque de protection, celle-ci affleurant à la surface de la plaque qui fait face à la porte.According to a characteristic of the present invention, this plate is hollowed out with a recess designed to receive a protective plate, the latter being flush with the surface of the plate which faces the door.

Au dessin annexé, donné seulement à titre d'exemple :

  • - la figure 1 est une vue en perspective éclatée du dispositif suivant l'invention, en position de montage sur un verrou à protéger,
  • - la figure 2 est une vue en coupe d'un verrou protégé par le dispositif de la figure 1, suivant un plan de coupe vertical passant par l'axe du cylindre du verrou, et
  • la figure 3 est une vue en coupe analogue à celle de la figure 2, d'un autre mode de réalisation de l'invention.
In the attached drawing, given only by way of example:
  • FIG. 1 is an exploded perspective view of the device according to the invention, in the mounting position on a lock to be protected,
  • FIG. 2 is a sectional view of a lock protected by the device in FIG. 1, along a vertical section plane passing through the axis of the cylinder of the lock, and
  • Figure 3 is a sectional view similar to that of Figure 2, of another embodiment of the invention.

On se réfère à la figure 1 du dessin où l'on a représenté le dispositif suivant l'invention qui comprend essentiellement une plaque 1 de forme généralement rectangulaire dans le mode de réalisation représenté, et une pièce 2 qui, de préférence, épouse la forme d'un disque percé d'une ouverture 15 en forme de fente diamétrale ou tout autre forme permettant l'insertion d'une clé. Le dispositif constitué de la plaque 1 et du disque 2 est conçu pour être monté sur une face d'une porte 3 équipée d'un mécanisme de serrure à cylindre tel qu'un verrou dont le boîtier est schématiquement représenté en 4, avec son pène 5 et son bouton de commande 5′, sur l'autre face de la porte. Un cylindre 6 déborde du boîtier 4 pour traverser la porte. La base 7 du cylindre est fixée par des vis ou autres moyens de fixation sur une plaque de support (non représentée) intérieure au boîtier du verrou 4. Ce sont ces moyens de fixation qu'il faut protéger des agressions des cambrioleurs qui agissent sur le cylindre 6 pour les briser en leur appliquant des efforts de cisaillement et/ou d'arrachement.Referring to Figure 1 of the drawing where there is shown the device according to the invention which essentially comprises a plate 1 of generally rectangular shape in the embodiment shown, and a part 2 which, preferably, follows the shape a disc pierced with an opening 15 in the form of a diametrical slot or any other form allowing the insertion of a key. The device consisting of the plate 1 and the disc 2 is designed to be mounted on one face of a door 3 equipped with a cylinder lock mechanism such as a lock, the housing of which is schematically represented in 4, with its bolt 5 and its control button 5 ′, on the other face of the door. A cylinder 6 projects from the housing 4 to pass through the door. The base 7 of the cylinder is fixed by screws or other fixing means on a support plate (not shown) inside the housing of the lock 4. It is these fixing means that must be protected from attack by burglars which act on the cylinder 6 to break them by applying shearing and / or tearing forces to them.

La plaque 1, réalisée par exemple en fonte ou en acier trempé et/ou cémenté de manière à présenter une forte dureté superficielle à l'épreuve des outils des cambrioleurs, présente deux trous carrés 8, 9 qui coopèrent avec deux boulons 10, 11 à têtes bloquantes complémentaires de ces trous, pour la fixation de la plaque sur la porte 3. Des alésages 8′, 9′ creusés dans la plaque 1 concentriquement aux trous 8, 9 et complémentairement aux têtes des boulons empêchent l'engagement d'un outil entre la tête et la plaque.The plate 1, made for example of cast iron or of hardened and / or case-hardened steel so as to have a high surface hardness resistant to burglars' tools, has two square holes 8, 9 which cooperate with two bolts 10, 11 to blocking heads complementary to these holes, for fixing the plate to the door 3. Bores 8 ′, 9 ′ hollowed out in the plate 1 concentrically with the holes 8, 9 and in addition to the heads of the bolts prevent the engagement of a tool between the head and the plate.

Suivant la présente invention (voir figure 2), une ou plusieurs contreplaques 12 peuvent être insérées entre la plaque 1 et la porte 3 pour rattraper la saillie du cylindre 6, sur la face 13 de la porte 3 opposée à celle qui reçoit le boîtier du verrou. Le trou percé dans la contreplaque pour le passage du cylindre peut être avantageusement de surface inférieure à celle du disque 2 placé en regard, pour renforcer la résistance à l'enfoncement par percussion du cylindre.According to the present invention (see Figure 2), one or more counterplates 12 can be inserted between the plate 1 and the door 3 to catch up with the projection of the cylinder 6, on the face 13 of the door 3 opposite to that which receives the housing of the lock. The hole drilled in the counterplate for the passage of the cylinder may advantageously be of smaller area than that of the disc 2 placed opposite, to reinforce the resistance to sinking by percussion of the cylinder.

Suivant une caractéristique de la présente invention, un logement 14 est formé dans l'épaisseur de la plaque 1, pour recevoir à rotation le disque 2. La plaque 1 est montée sur la porte 3 dans une position telle que l'axe du disque 2 soit sensiblement colinéaire à celui de la partie tournante du cylindre 6.According to a characteristic of the present invention, a housing 14 is formed in the thickness of the plate 1, to receive the disc 2 in rotation. The plate 1 is mounted on the door 3 in a position such that the axis of the disc 2 is substantially collinear with that of the rotating part of the cylinder 6.

Le logement 14 est de forme circulaire, de diamètre et d'épaisseur conformes à ceux du disque, de manière que celui-ci puisse tourner librement dans ce logement. Cette libre rotation est améliorée si le disque porte sur la contreplaque 12, comme indiqué ci-dessus.The housing 14 is circular, of diameter and thickness conforming to those of the disc, so that the latter can rotate freely in this housing. This free rotation is improved if the disc bears on the counterplate 12, as indicated above.

Le fond du logement 14 est percé d'un trou évasé 16 qui dégage un accès vers la fente 15 du disque 2, à partir de la surface extérieure de la plaque 1. Ainsi, on peut introduire une clé dans le cylindre 6, à travers le trou 16 et la fente 15 du disque 2.The bottom of the housing 14 is pierced with a flared hole 16 which gives access to the slot 15 of the disc 2, from the external surface of the plate 1. Thus, a key can be introduced into the cylinder 6, through the hole 16 and the slot 15 of the disc 2.

Suivant une caractéristique importante du dispositif selon l'invention, le diamètre du disque 2 est sensiblement supérieur à celui du cylindre. Grâce à cette disposition, la résistance à des efforts de percussion axiaux appliqués suivant l'axe de la flèche F est améliorée du fait que ces efforts sont encaissés par une surface égale à celle du disque 2, très supérieure à celle de la section droite du cylindre 6.According to an important characteristic of the device according to the invention, the diameter of the disc 2 is substantially greater than that of the cylinder. Thanks to this arrangement, the resistance to axial percussion forces applied along the axis of arrow F is improved by the fact that these forces are collected by an area equal to that of the disc 2, much greater than that of the cross section of the cylinder 6.

Le trou 16, circulaire, est évasé vers l'extérieur pour faciliter l'insertion de la clé dans le cylindre, à travers la fente 15 du disque 2 qui est appliqué sur l'extrémité du cylindre où doit être introduite la clé.The hole 16, circular, is flared outward to facilitate the insertion of the key into the cylinder, through the slot 15 of the disc 2 which is applied to the end of the cylinder where the key is to be inserted.

On expliquera maintenant en quoi la structure du dispositif suivant l'invention s'oppose efficacement aux agressions mentionnées en préambule.We will now explain how the structure of the device according to the invention effectively opposes the attacks mentioned in the preamble.

Tout d'abord il est clair que la plaque 1, la contreplaque 12 et le disque 2 suppriment tout accès à la paroi latérale du cylindre 6 : on ne peut plus appliquer un couple à celui-ci autour de son axe pour cisailler les vis de fixation du cylindre.First of all, it is clear that the plate 1, the plywood 12 and the disc 2 eliminate all access to the side wall of cylinder 6: a torque can no longer be applied to it around its axis to shear the cylinder fixing screws.

Comme on l'a vu plus haut, la surface accrue du disque 2 donne à l'ensemble une meilleure résistance aux percussions axiales, et donc aux efforts d'arrachement et/ou de cisaillement.As seen above, the increased surface of the disc 2 gives the assembly better resistance to axial percussion, and therefore to tearing and / or shearing forces.

Le disque 2, qui tourne fou, empêche l'insertion et le blocage dans le cylindre d'un outil vissant. L'outil se bloque dans la fente 15 du disque et tourne avec lui sans pouvoir s'accrocher au cylindre. Toute traction axiale sur le cylindre à l'aide d'un tel outil est alors interdite.The disc 2, which turns crazy, prevents the insertion and blocking in the cylinder of a screwing tool. The tool hangs in the slot 15 of the disc and rotates with it without being able to catch on the cylinder. Any axial traction on the cylinder using such a tool is then prohibited.

La présence de la plaque 1, en fonte ou en acier trempé et/ou cémenté, par exemple, et du disque 2 renforce la résistance aux agressions par perçage.The presence of the plate 1, of cast iron or of hardened and / or case-hardened steel, for example, and of the disc 2 reinforces the resistance to attack by drilling.

On constate que le dispositif suivant l'invention s'oppose avec succès aux quatre principales agressions mentionnées en préambule.It can be seen that the device according to the invention successfully opposes the four main attacks mentioned in the preamble.

Suivant une caractéristique avantageuse de ce dispositif, ce résultat est atteint avec des moyens (plaque 1, disque 2, boulons 10, 11) qui peuvent être montés sur tout mécanisme de serrure à cylindre du commerce déjà installé sans aucun démontage, adaptation ou autre modification de celui-ci. Ce dispositif de protection présente ainsi un caractère universel.According to an advantageous characteristic of this device, this result is achieved with means (plate 1, disc 2, bolts 10, 11) which can be mounted on any commercially available cylinder lock mechanism already installed without any disassembly, adaptation or other modification of it. This protection device thus has a universal character.

Bien entendu, on peut incorporer aussi le dispositif suivant l'invention à un mécanisme de serrure muni de moyens conçus pour coopérer avec ce dispositif, tels que par exemple des plaques d'appui débordant du boîtier du mécanisme et percées de trous pour le passage des boulons 10, 11. De telles plaques d'appui renforcent la solidité de la structure.Of course, the device according to the invention can also be incorporated in a lock mechanism provided with means designed to cooperate with this device, such as for example support plates projecting from the mechanism housing and pierced with holes for the passage of bolts 10, 11. Such support plates strengthen the solidity of the structure.

En variante, la plaque 1 peut être percée en outre d'un trou pour le passage d'un carré pour poignée de commande de pène demi-tour.As a variant, the plate 1 can also be pierced with a hole for the passage of a square for the bolt control handle.

La fabrication du disque 2 à fente peut être facilitée en réalisant et en montant dans le logement 14 deux demi-disques symétriques échancrés sur un diamètre et reconstituant ensemble le disque 2, chaque demi-disque étant conforme à la moitié du disque 2 qui se trouve d'un côté ou de l'autre du plan de symétrie de la fente diamétrale percée dans ce disque.The manufacture of the slotted disc 2 can be facilitated by making and mounting in the housing 14 two symmetrical half-discs indented on a diameter and reconstituting the disc 2 together, each half-disc conforming to half of the disc 2 which is on one side or the other of the plane of symmetry of the diametral slot drilled in this disc.

La plaque 1 peut être dimensionnée de manière à présenter une surface suffisante pour protéger entièrement le verrou placé au droit de cette plaque, sur l'autre face de la porte. Elle peut être habillée d'un capot ou autre revêtement décoratif.The plate 1 can be dimensioned so as to have a sufficient surface to fully protect the latch placed to the right of this plate, on the other face of the door. It can be dressed with a hood or other decorative covering.

On a représenté à la figure 3 du dessin annexé, une variante du dispositif suivant l'invention. Sur les figures 1 à 3, une même référence numérique désigne des éléments ou organes identiques ou similaires. Ainsi, il apparaît que le dispositif de la figure 3 se distingue essentiellement du dispositif des figures 1 et 2 par la présence d'une plaque de protection 17 logée dans un évidement 18 formé dans la face de la plaque 1 qui vient en regard de la porte 3. La plaque de protection affleure à la surface de la plaque 1 et vient s'appuyer sur la contreplaque 12 éventuellement insérée pour absorber la saillie du cylindre 6 sur la face 13 de la porte. La plaque de protection 17 peut alors coopérer elle-même à l'absorption de cette saillie, comme représenté à la figure 3.There is shown in Figure 3 of the accompanying drawing, a variant of the device according to the invention. In FIGS. 1 to 3, the same reference numeral designates identical or similar elements or members. Thus, it appears that the device of FIG. 3 essentially differs from the device of FIGS. 1 and 2 by the presence of a protective plate 17 housed in a recess 18 formed in the face of the plate 1 which comes opposite the door 3. The protective plate is flush with the surface of the plate 1 and comes to bear on the counterplate 12 possibly inserted to absorb the projection of the cylinder 6 on the face 13 of the door. The protective plate 17 can then cooperate itself with the absorption of this projection, as shown in FIG. 3.

La plaque de protection 17 est sensiblement coextensive à la plaque 1. Elle est réalisée en un acier spécial très dur au manganèse, tel qu'un acier Z 120 M12, de manière à protéger le verrou 4 d'attaque par perçage. Elle renforce aussi la porte 3 en accroissant la surface de celle-ci qui encaisse un effort de percussion éventuellement appliqué au disque 2 lors d'une agression. La résistance de l'ensemble en est ainsi améliorée.The protective plate 17 is substantially coextensive with the plate 1. It is made of a very hard special manganese steel, such as a Z 120 M12 steel, so as to protect the attack latch 4 by drilling. It also strengthens the door 3 by increasing the surface thereof which collects a percussion force possibly applied to the disc 2 during an attack. The resistance of the assembly is thereby improved.

La plaque 1 du mode de réalisation de la figure 3 comporte des douilles taraudées intérieurement 19, 19′ conçues pour s'adapter complémentairement dans des trous percés dans la porte. Le dispositif est alors fixé sur celle-ci à l'aide de boulons 20, 20′ traversant des perçages 21, 21′ respectivement, à partir de la face intérieure de la porte pour se visser dans les douilles 19, 19′ de la plaque 1. La tête des boulons n'étant accessible que de l'intérieur du local fermé par la porte, la sécurité du dispositif suivant l'invention s'en trouve renforcée. On pourra à cet égard, protéger les boulons 20, 20′ d'une attaque par perçage, à partir du côté extérieur de la porte 3, en plaçant des pièces de renforcement telles que par exemple, des billes en acier dur, au fond des douilles 19, 19′.The plate 1 of the embodiment of Figure 3 has internally threaded sockets 19, 19 'designed to complement each other in holes drilled in the door. The device is then fixed on this using bolts 20, 20 ′ passing through holes 21, 21 ′ respectively, from the inside of the door to be screwed into the sockets 19, 19 ′ of plate 1. The head of the bolts being accessible only from inside the room closed by the door, the security of the device according to the invention is reinforced. In this regard, it will be possible to protect the bolts 20, 20 ′ from attack by drilling, from the outside of the door 3, by placing reinforcing parts such as, for example, hard steel balls, at the bottom of the sockets 19, 19 ′.

Diverses modifications peuvent être apportées aux modes de réalisation décrits ci-dessus, sans que l'on sorte du cadre de la présente invention telle que définie par les revendications. Ainsi, le disque 2 pourrait tourner dans le logement 14 avec un jeu permettant d'adapter le dispositif à des erreurs de centrage des perçages à réaliser dans la porte pour la fixation du dispositif. En outre, un tel jeu provoque des vibrations du disque en cas d'attaque de celui-ci à la perceuse, vibrations qui rendent l'attaque plus difficile.Various modifications can be made to the embodiments described above, without departing from the scope of the present invention as defined by the claims. Thus, the disc 2 could rotate in the housing 14 with a clearance making it possible to adapt the device to errors in centering the holes to be made in the door for fixing the device. In addition, such a play causes vibrations of the disc in the event of attack thereof with the drill, vibrations which make the attack more difficult.

Pour renforcer l'appui des têtes des boulons de fixation du dispositif suivant l'invention, éventuellement associées à des rondelles 22, 22′ comme dans le mode de réalisation de la figure 3, on peut monter le verrou sur une plaque de support qui s'applique alors contre la face intérieure de la porte.To strengthen the support of the heads of the fixing bolts of the device according to the invention, possibly associated with washers 22, 22 ′ as in the embodiment of FIG. 3, the lock can be mounted on a support plate which s then applies against the inside of the door.

La fente 15 rectiligne du disque 2 pourrait aussi être remplacée par un trou de forme différente, circulaire par exemple, pour s'adapter à des clés non plates.The straight slot 15 of the disc 2 could also be replaced by a hole of different shape, circular for example, to adapt to non-flat keys.

Bien entendu l'invention n'est pas limitée aux modes de réalisation décrits et représentés qui n'ont été donnés qu'à titre d'exemple. Elle s'étend au contraire à tout mécanisme de serrure à cylindre équipé de moyens conçus pour coopérer avec le dispositif suivant l'invention, l'ensemble mécanisme/dispositif constituant alors un tout.Of course, the invention is not limited to the embodiments described and shown which have been given only by way of example. On the contrary, it extends to any cylinder lock mechanism equipped with means designed to cooperate with the device according to the invention, the mechanism / device assembly then constituting a whole.

Claims (11)

  1. Protection device for a cylinder lock mechanism arranged so as to pass through a door to which the mechanism is mounted, comprising a plate (1) designed to be fixed to the door so as to protect the free end of the cylinder which opens out on one face of the door, a part (2) in the shape of a disc and having an aperture (15) made in it for a key to pass through and mounted so as to rotate in a housing (14) formed in the thickness of the plate (1) opposite the free end of the cylinder (6), this housing opening out onto the face of the plate (1) which bears on the door, the back of the housing having a hole to enable the key of the mechanism to be inserted into the cylinder through the opening (15) in the part (2), characterised in that the diameter of the part (2) in the shape of a disc is greater than that of the cylinder and in that this part is freely flush with the surface of the plate which is turned towards the door so as to increase the surface area over which percussive forces applied to the part (2) are transmitted to the door.
  2. Device according to Claim 1, characterized in that it comprises at least one backplate (12) inserted between the plate (1) and the door (3) so that the gap produced by the protrusion of the cylinder from the door is filled in.
  3. Device according to Claim 2, characterized in that the backplate (12) has in it a hole with a surface area less than that of the part (2), opposite the latter.
  4. Device according to any one of Claims 1 to 3, characterized in that the back of the housing (14) has in it a hole (16) which widens out towards the external surface of the plate (1).
  5. Device according to any one of Claims 1 to 4, characterized in that it comprises a protective plate (17) located in a recess (18) in the plate (1), this protective plate (17) being flush with the surface of the plate (1) which faces the door.
  6. Device according to any one of the preceding claims, characterized in that coach bolts (10, 11) fix the plate (1) to the door (3).
  7. Device according to any one of Claims 1 to 5, characterized in that the plate (1) is equipped with threaded sockets (19, 19') designed to enter corresponding holes in the door, bolts (20, 20') passing through the door from the inside face in order to be screwed into the sockets so as to fix the device to the door.
  8. Device according to Claim 7, characterized in that reinforcing pieces are placed in the ends of the sockets.
  9. Device according to any one of the preceding claims, characterized in that the part (2) in the form of a disc turns in the housing (14) with a predetermined clearance.
  10. Device according to any one of the preceding claims, characterized in that the aperture (15) in the disc (2) is symmetrical with respect to a diameter and in that this disc consists of two half-discs which are symmetrical with respect to this diameter.
  11. Cylinder lock mechanism comprising a protective device in accordance with any one of the preceding claims.
EP89403204A 1988-11-23 1989-11-21 Protection device for cylinder locks Expired - Lifetime EP0370893B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89403204T ATE103030T1 (en) 1988-11-23 1989-11-21 PROTECTION DEVICE FOR CYLINDER LOCKS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8815248A FR2639394B1 (en) 1988-11-23 1988-11-23 PROTECTIVE DEVICE FOR A CYLINDER LOCK MECHANISM
FR8815248 1988-11-23

Publications (2)

Publication Number Publication Date
EP0370893A1 EP0370893A1 (en) 1990-05-30
EP0370893B1 true EP0370893B1 (en) 1994-03-16

Family

ID=9372143

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89403204A Expired - Lifetime EP0370893B1 (en) 1988-11-23 1989-11-21 Protection device for cylinder locks

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EP (1) EP0370893B1 (en)
AT (1) ATE103030T1 (en)
DE (1) DE68913918T2 (en)
FR (1) FR2639394B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996002719A1 (en) * 1994-07-19 1996-02-01 Norman Axford A locking bracket
GB2462387B (en) * 2005-04-21 2010-03-17 Surelock Mcgill Ltd Lock assembly
WO2010049458A1 (en) * 2008-10-30 2010-05-06 Datakammaren Ab Device for protection against manipulation of a lock
BE1020046A3 (en) * 2011-07-01 2013-04-02 Metal Quartz Sa PROTECTION SYSTEM FOR BLINDEE DOOR.
CN103061607A (en) * 2013-02-17 2013-04-24 李理 Door lock protective panel for household door plate

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3083563A (en) * 1961-12-07 1963-04-02 Greenwald Associaltes Comprisi Theft proof lock assembly for coin operated machines
US3550411A (en) * 1968-06-13 1970-12-29 Schlage Lock Co Lock protecting mechanism
US4316371A (en) * 1980-01-18 1982-02-23 Fichet-Bauche High safety bolt control devices
US4530223A (en) * 1982-11-01 1985-07-23 Medeco Security Locks, Inc. Guard for key cylinder
DE8508267U1 (en) * 1985-03-20 1985-06-13 Peter Metz, Homa-Beschläge GmbH & Co KG, 5620 Velbert Door fitting
DE8712272U1 (en) * 1987-09-10 1987-11-19 Zeiss Ikon Ag, 7000 Stuttgart Lock protection device
CH667689A5 (en) * 1988-02-08 1988-10-31 Abst Anlage Bauten Sicherheits Security device for protecting door lock - is fixed disc fitting round lock cylinder, concealed by cup shaped disc rotated by key
DE8808897U1 (en) * 1988-07-11 1988-08-25 August Börkey Nachf. GmbH, 5820 Gevelsberg Locking cylinder with drilling protection

Also Published As

Publication number Publication date
DE68913918D1 (en) 1994-04-21
FR2639394A1 (en) 1990-05-25
EP0370893A1 (en) 1990-05-30
DE68913918T2 (en) 1994-06-30
ATE103030T1 (en) 1994-04-15
FR2639394B1 (en) 1995-06-23

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