EP1688565A1 - Lock with improved security against tampering - Google Patents

Abstract

The lock has a cylinder (1), housing a lock control mechanism, with a radial extension extending to be assembled in a fixed case of the lock. A U-bolt (9) is engaged around the extension and integrated to the cylinder in a predetermined longitudinal position. Legs (14) fix the bolt in longitudinal support on an intermediate column (18) located between inner and outer columns (16, 17). An independent claim is also included for a door for closing a room equipped with a safety lock.

Description

The present invention relates to the design and manufacture of an improved security lock against burglary. It also relates to a door closing a room that is equipped with such a lock.

The lock according to the invention is of the cylinder type comprising a cylinder in which a locking control key is actuated, in a manner that is in itself conventional, a rotary bit for transmitting the locking control to a bolt by via a linkage, to engage the latch in a keeper fixed to the door jamb, or to disengage, and thereby achieve locking or unlocking the door in the closed position.

In this type of lock, the cylinder conventionally has a receiving portion of the barrel, and a radial extension extending over its length for mounting in a door. According to a current mounting technique, the cylinder is installed in a door, so as to cross the entire thickness, so that it comes flush with its surface on each of its faces. It is fixed to the door by means of a screw which is housed, from the edge of the door, and passing through the latter, inside a hole provided for this purpose in the radial extension of the door. cylinder.

Such locks have an unsatisfactory degree of security. Indeed, when one wishes to enter the room by breaking, without having the key of the lock, especially for a burglary, it is sufficient to overcome the lock to hit the cylinder with a hammer or another similar instrument from the outside of the door. The knuckles have the effect of breaking the screw holding the cylinder in place in the door, so that the cylinder can be easily disengaged from the door. It is then easy to manually unlock the locking mechanism of the door, and to penetrate inside the room. The same result can be obtained by drilling the door at the path of passage of the screw, in order to reach the latter and destroy it.

Document DE 93 09 217 describes a safety lock in which the fixing of the cylinder is carried out not in a direction transverse to the axis of the cylinder, but in a longitudinal direction, by means of a stirrup having an interlocking profile over the radial extension of the cylinder and fixing on the latter in a predetermined longitudinal position. The stirrup is itself fixed, by lateral fastening tabs, in longitudinal support against an external amount of the lock. The security level of such a lock, if it is improved compared to conventional locks, however still remains unsatisfactory.

The present invention aims to overcome the disadvantages of existing locks, including those described above, by providing a high security lock, which is difficult to drill or tear the door.

To this end, the invention proposes a security lock which comprises a housing cylinder of a locking control mechanism having a radial extension extending over its length for its mounting in a lock housing which is intended to be fixed mounted on a door on which the lock will be installed. This housing generally comprises two extreme amounts, including an internal amount intended to be applied against one side of the door. These two uprights each have a window which gives free access to the locking mechanism for a locking control key actuating a rotary blade for transmitting the locking control to a bolt, via a linkage in itself. same classic. The housing can also be replaced by a locking block integrated in the thickness of a door, the constituent elements of the lock then being mounted inside this block.

The lock according to the invention furthermore comprises a clamp for fixing the cylinder longitudinally in the lock, that is to say along the axis of the cylinder, this stirrup having a profile fitting over the radial extension of the cylinder. and fixing itself to the latter in a predetermined longitudinal position, between the two end uprights, which is chosen in particular so as not to hinder the movements of the bit. It also includes a first protective cap and a second protective cap respectively fitting around the end portions of the cylinder, each having an access window at an end face of the cylinder and being fixed to each other in this position nested around the cylinder.

These two caps advantageously conceal the cylinder of sight when the lock is mounted on a door, and they conceal in particular the fact that the cylinder is fixed in the lock in a longitudinal direction and not transverse, so that it is impossible to act on this fixation by means of exerted forces from the outside of the door, in the same longitudinal direction. This makes it more difficult to break the lock.

In addition, these caps also help to protect the lock against break-ins on the one hand by the fact that they fit around the cylinder and the stirrup, thus constituting a protective reinforcement for the latter, and other part by their attachment to each other, on both sides of the lock, longitudinally with respect to the axis of the cylinder. This attachment reinforces the degree of securing of the cylinder and the stirrup, in a direction which this time not transverse but longitudinal with respect to the axis of the cylinder.

The lock according to the invention thus has an improved degree of security against burglary compared to conventional locks.

The caps each have an access window at an end face of the cylinder, so that access to them through the insertion opening of the key actuating the locking mechanism can still be accessed.

They preferably consist of two hollow parts each providing an internal cavity for receiving the cylinder.

According to an advantageous characteristic of the invention, the yoke is fixed to the radial extension of the cylinder by means of a pin which engages in the transverse direction of the latter, in preferably passing through an orifice formed in conventional manner in the cylinders to allow mounting in the door. The pin is advantageously inaccessible from outside the housing of the lock.

According to preferred embodiments in industrial practice, the invention has the following characteristics, implemented separately or in each of their technically operating combinations.

These various features are particularly intended to further enhance the degree of security of the lock according to the invention.

In preferred embodiments of the invention, the stirrup occupies the entire height of the radial extension of the cylinder, and its upper face is hollowed out with notches allowing a rotating bit of transmission of the locking control carried by the cylinder. This feature advantageously ensures that the stirrup engages the radial extension of the cylinder to a height sufficient for the joining of these two elements can be performed in a solid manner, and that at the same time it does not interfere with the movements of rotation of the bit, which are driven by the rotation of the barrel under the control of the key. The presence in the lock of the caliper thus advantageously has no influence on the proper operation of the locking mechanism of the lock.

In preferred embodiments of the invention, the two caps are affixed to each other, preferably without touching each other, framing the cylinder and the stirrup. Their fixing is in particular carried out by means of screws inserted in orifices formed in the first cap and coming to screw in orifices formed in the second cap.

According to an advantageous characteristic of the invention, the second cap is associated with a pellet having free rotation against the access window to an end face of the cylinder, between this window and the cylinder. This pellet has a slot for access of the key to the locking mechanism. It protects the lock against drilling at this point.

The second cap is preferably associated with a reinforcing sheath wrapping the end portion of the upper portion of the cylinder inserted inside the second cap. This sheath advantageously provides additional protection for the cylinder.

In preferred embodiments of the invention, the second cap has, on its edge opposite the access window to the cylinder, a thicker collar making it more difficult pulling when the lock is installed on a door.

According to an advantageous characteristic of the invention, the first cap and the second cap are each associated with a cover covering its face carrying the access window to the cylinder. This cover also has a window allowing access to the locking mechanism, which is superimposed on the window formed in the cap. It is fixed in particular around the corresponding cap by clipping on an annular ring engaging in a groove dug for this purpose on the peripheral surface of the cap.

In preferred embodiments of the invention, the stirrup and the first cap are formed in a single piece, which simplifies the operations of manufacture and assembly of the lock. The immobilization of the stirrup in the lock is then ensured only by fixing the two caps to one another. The caps being arranged on either side of the fixed housing of the lock, respectively bearing against the opposite external faces of the latter, the stirrup and the cylinder which is fitted therein are firmly fixed inside the lock and it is not possible to reach them from the outside. The degree of security of the lock is high.

In this configuration, the yoke preferably attaches to the radial extension of the cylinder through the first cap, by means of a pin engaging in transverse direction through an orifice in the first cap.

In other preferred embodiments of the invention, the stirrup comprises fixing lugs bearing longitudinally on an amount of the lock, in a position where the stirrup is located between this fixing amount and an internal amount of the lock defining the fixed housing and intended to be applied against one side of a door, so that it is inaccessible, except to open the housing delimited by the two uprights.

The brackets of the bracket preferably extend laterally on either side of its profile. They are fixed in particular to the fixing amount by screwing.

According to an advantageous characteristic of the invention, the two protective caps are then fixed to one another by means of a system of screws inserted in orifices formed in the first cap and being screwed into orifices. formed in the second cap, passing through holes provided for this purpose in the inner post and the amount of attachment.

In preferred embodiments of the invention, the attachment post is perforated, so that it is lightweight.

According to an advantageous characteristic of the invention, the fixed housing of the lock is delimited by two extreme uprights, including an internal upright intended to be applied against a face of a door and an external upright concealing the inside of the lock. The fixing screws of the bracket to the mounting post are therefore inaccessible from the outside of the housing, as well as the fixing screws of the two protective caps to one another.

The external amount is preferably delivered in two separate parts, which allows transport and easy passage of the dismounted lock in low places. These two parts are preferably joined to a mounting location of a handle opening and closing the door on which the lock will be installed.

The invention also relates to a closing door of a room equipped with the security lock it proposes, in which the fixed housing of the lock is disposed on one side of the door. interior door to the room, so it is impossible to access the caliper or possibly the mounting post from outside the room. The first cap is then located on the side of the inner door to the room, and the second cap through the thickness of the door to come out of the door outside said room. From outside the room, it is impossible to access the cap fixing screws to each other.

In other embodiments, the fixed housing is replaced by a locking block integrated into the thickness of a security door, preferably metal-shielded. The elements of the lock are then arranged in a groove provided for this purpose in the thickness of the door on one side of the door inside the room.

• la figure 1 représente un cylindre et l'étrier associé d'une serrure de sécurité selon l'invention ;
• la figure 2 est une vue en perspective simplifiée des différents montants d'une serrure selon l'invention ;
• la figure 3 montre une vue en coupe des principaux éléments d'une serrure selon l'invention montée sur une porte ;
• la figure 4 montre le premier capuchon de protection du cylindre et de l'étrier de la figure 1 et les différents éléments qui lui sont associés ;
• la figure 5 représente la face de réception du cylindre du capuchon de la figure 4 ;
• la figure 6 montre le second capuchon de protection du cylindre et de l'étrier de la figure 1 et les différents éléments qui lui sont associés ;
• la figure 7 représente la face de réception du cylindre du capuchon de la figure 6 ;
• la figure 8 représente le cylindre, l'étrier et les capuchons des figures précédentes dans leur relation de montage les uns par rapport aux autres ;
• et la figure 9 représente un étrier et un capuchon selon l'invention formés en une pièce monobloc.

The invention will now be more fully described in the context of preferred features and their advantages, with reference to Figs. 1 to 9 in which:

• Figure 1 shows a cylinder and the associated yoke of a security lock according to the invention;
• Figure 2 is a simplified perspective view of the different amounts of a lock according to the invention;
• Figure 3 shows a sectional view of the main elements of a lock according to the invention mounted on a door;
• Figure 4 shows the first protective cap of the cylinder and the caliper of Figure 1 and the various elements associated therewith;
• Figure 5 shows the receiving face of the cylinder of the cap of Figure 4;
• Figure 6 shows the second protective cap of the cylinder and the stirrup of Figure 1 and the various elements associated therewith;
• Figure 7 shows the receiving face of the cylinder of the cap of Figure 6;
• FIG. 8 represents the cylinder, the stirrup and the caps previous figures in their relationship of assembly relative to each other;
• and Figure 9 shows a stirrup and a cap according to the invention formed in a single piece.

A lock according to the invention is shown, in a preferred embodiment, in Figures 1 to 8. It comprises a cylinder 1 for housing a locking control mechanism, having a radial extension 3 extending over its entire length. length, for its mounting in a fixed housing of the lock comprising two extreme amounts. These uprights have respective windows which allow free access to the locking mechanism for a locking control key actuating a rotating bit 7 carried by the cylinder, which ensures the transmission of the locking control to a bolt via a linkage in itself classic.

According to the invention, the lock comprises a stirrup 9 having a profile fitting over the radial extension 3, and fixedly secured to the cylinder 1 in a predetermined longitudinal position, without however hindering the movements of the blade 7. It comprises also tabs 14 for fixing the stirrup 9 bears longitudinally on an intermediate amount of the lock located between the two end uprights.

The lock is intended to be installed on a door closing a room, the cylinder 1 through the thickness of the door, in a bore provided for this purpose, to open by its two end faces 4 and 5 on the surface of each of the faces of the door.

The cylinder 1, which is shown in FIG. 1, has an elongated shape. It comprises an upper housing portion of a barrel 57, of substantially circular section, which is extended by a lower radial extension 3 for mounting in a fixed housing of the lock. The radial extension 3 has a narrower section, elongated downwards in oval. The different parts of the cylinder are here, and throughout this description, defined by relative to the normal position of use of the lock, that is to say when it is mounted vertically on a door which is in the vertical position, the barrel being located in the upper part of the cylinder. The invention however also applies in the same way regardless of the orientation of the cylinder and / or the lock relative to the door.

The rotary barrel, or rotor, 57 has an insertion opening of a key 6 on each of the end faces 4 and 5 of the cylinder. This key rotates a bit 7 carried by the cylinder in its upper part. The rotation of the bit 7 in turn controls the movements of a transmission linkage to a bolt, which is of current type.

The bit 7 divides the cylinder 1 into two parts, an inner portion ending in an end face 5 intended to be located on the side of the door interior to the room, and an outer portion ending in an end face 4 intended to be located on the side of the door outside the room. The inner portion preferably has a length less than that of the outer portion. Their respective lengths may for example be equal to about 30 mm and 60 mm.

The radial extension 3 is pierced by a transverse orifice 8, which is located just below the blade 7, and which allows the fixing of the cylinder in the lock.

In the cylinder 1 is associated, in accordance with the invention, a rigid stirrup 9 having a U-shaped profile body, which is arranged around the radial extension 3 of the cylinder, substantially centered longitudinally on both sides. Another of the orifice 8. The stirrup has a length less than that of the cylinder, in particular equal to about 30 mm. Its height is slightly less than the height of the lower part of the cylinder located under the bit 7. Its width and shape are such that it follows the wall of the radial extension 3 of the cylinder around which it is disposed.

Each of the uprights 10 of the stirrup 9 is pierced, approximately mid-length, with an orifice 11 for its attachment to the cylinder 1. When the stirrup 9 is correctly engaged around the cylinder 1, the holes 11 of the stirrup and the orifice 8 of the cylinder are located in alignment with each other. The two parts can then be fixed to each other by means of a matted seam 12 inserted successively into each of these orifices, in a direction transverse to the cylinder 1.

In this configuration, the bit 7 is located just above the stirrup 9. On a length at least equal to the thickness of the blade 7, and in the same position as this one along the length of the cylinder 1, a notch 13 is formed on the upper face of each of the uprights 10 of the stirrup. In the particular case of practical application considered here, this notch has a length substantially equal to the length of the bit 7, and a depth of the order of 1 mm, which ensures that the bit will not come hitting, in its rotational movement, the upper end of the uprights 10 of the stirrup 9.

At its end intended to be located on the inside of the door, towards the room, the stirrup 9 has two lugs 14 extending laterally on either side of each of the uprights 10. Each of the legs 14 is pierced with an orifice 15 for fixing the caliper bearing longitudinally on an amount of the lock.

The various amounts of the lock are illustrated in FIG. 2, in a representation which has been simplified for the sake of clarity and which does not reproduce the orifices for fixing the uprights to one another or to the various elements constituting the mechanism. locksmith.

The lock according to the invention comprises three main amounts. The entire locking mechanism is enclosed in a fixed housing of the lock, between the two end uprights 16 and 17. The lock further comprises an intermediate upright 18, which is disposed between the end uprights 16 and 17, which allows the fixing the stirrup 9 in the lock. The assembly formed by these amounts is intended to be fixed against a face 19 of the door 20, preferably the inner face to the room (Figure 3).

The fixing of the lock housing to the door 20 is effected by means of the internal upright 16, which is intended to be pressed against the inner face 19 of the door 20. The elements of the locksmith mechanism are fixed between the inner upright 16 and the intermediate amount 18. The latter is perforated with several windows 21, which has the effect of reducing its weight. The external upright 17 is intended to be fixed to the intermediate upright 18. It is its longitudinal face, in the upper position in Figure 2, which is visible from the inside of the room when the lock is mounted on the door. It allows to hide the internal elements of the lock.

The internal upright 16 is pierced in its thickness with an orifice 22 having a shape similar to that of the cylinder 1. In practice, its dimensions are slightly greater. This orifice 22 allows the passage of the cylinder 1 through the upright 16. On either side of this orifice are also arranged two holes 23 which will allow the passage of screws for fixing protective caps of the cylinder, which will be described later ( Figures 4 to 7).

The intermediate upright 18 is pierced in its thickness with an orifice 24 allowing the insertion of the assembly "cylinder 1 - body of the stirrup 9" when the stirrup is fixed in its normal position of use around the radial extension 3 of the cylinder. The brackets 14 of the bracket can not be inserted through this hole. On the intermediate upright 18, on each side of the orifice 24, are further pierced two orifices 25 for the passage of screws for fixing the tabs 14 of the stirrup 9. These screws are inserted consecutively into the orifices 15 of the tabs 14 and in the orifices 25 of the upright 18. The tabs 14 of the caliper are thus pressed against the intermediate upright 18 of the lock in the longitudinal direction of the cylinder 1 inserted into the caliper, perpendicular to the door 20. The intermediate upright 18 also carries, on both sides of the orifice 24, two holes 26 which will allow the fixing of protective caps of the cylinder.

The outer amount 17 is composed of separate half-sizes 27 and 28 which are connected in the extension of one of the other, especially by screwing, when the lock is mounted on the door. A cover 29 makes it possible to mask the junction between these two half-uprights. This junction is preferably at the location of attachment of a door handle, which is not shown in the figures. The amount 17 can also be composed in one piece.

The half-upright 27, which is intended to be in the lower part of the lock when the latter is mounted on a vertical door, that is to say between the floor and the door handle, is pierced in its thickness. a substantially circular orifice 30, of diameter substantially equal to the height of the cylinder 1. This orifice 30 constitutes an access window to the cylinder 1, and more precisely to the insertion opening 6 of a control key of the bit 7, from the interior volume of the room. The amounts of the lock are constituted so that when they are assembled with each other around the lock mechanism, in their normal position of use, that is to say parallel to each other, the orifices 22, 24 and 30 are in alignment with each other, so that the cylinder can be inserted through the assembly formed by these amounts. It is the same for the holes 23 and 26.

The lock is preferably delivered to the user in a disassembled configuration, in several parts. The two half-uprights 27 and 28 are preferably separated from each other, which allows easy transportation and passage in places with little space, such as elevators or stairs. The locksmithing mechanism is delivered in configuration already pre-installed, that is to say, already set in its operating position between the inner amount 16 and the intermediate amount 18. This facilitates on-site installation operations .

The half-upright 28, which is intended to be located in the upper part of the lock mounted on a vertical door, above the door handle, can be cut on the spot at the appropriate height, depending on the actual height of the door. door.

The lock is mounted on the door 20 in the configuration shown in Figure 3, which shows a sectional view along a plane perpendicular to the door. This figure shows the door 20 in its thickness. This figure illustrates the mounting on a door of a lock according to the invention without the presence of the protective caps, which will be described later.

In this configuration, the three main amounts of the lock are mounted parallel to each other. The inner post 16 is applied against the surface of the face 19 of the door 20 to the room. For the sake of clarity of the figure, these two elements are shown slightly detached from one another, while they are actually pressed against each other. Between the internal upright 16 and the intermediate upright 18 is the entire locksmithing mechanism itself, which is not shown in the figure for the sake of clarity, but which is conventional in itself. Beyond the intermediate amount 18 is the external amount 17.

The cylinder 1 passes through the thickness of the door 20, through a bore provided for this purpose in the latter, as well as all of the respective uprights 16, 18 and 17. Its upper part 2 carrying the insertion opening d a key 6 is thus accessible on the one hand on the surface of the external upright 17 and on the other hand from the outside of the door. The assembly is arranged in such a way that the blade 7 is situated between the inner upright 16 and the intermediate upright 18, just like the locksmith mechanism whose movement of rotation of the blade controls the operation.

The stirrup 9 is disposed in its normal position of use, around the radial extension 3 of the cylinder, under the bit 7, fixed by means of the pin 12 which penetrates into the orifices 11 of the stirrup 9 and in the 8 of the cylinder 1. It is arranged relative to the amounts of the lock so that the lugs 14 are located between the external upright 17 and the intermediate upright 18, while the body of the caliper is arranged meanwhile between the intermediate upright 18 and the internal upright 16. The fastening of the stirrup 9 to the intermediate upright 18 is then effected by means of screws inserted in the orifices 15 of the fastening tabs 14 and in the orifices 25 provided for this purpose on the intermediate upright 18, in the longitudinal direction of the cylinder 1.

It is then impossible, from outside the room, to reach these screws to break them and thus break into the room, disengaging the cylinder from the rest of the lock. Indeed, these screws are located on the one hand on the side of the inner door to the room, and on the other hand in areas that are offset laterally with respect to the bore which is formed in the door for the passage of the cylinder . They are therefore inaccessible from outside the room. In addition, because the stirrup takes the form of the radial extension of the cylinder, it is impossible to reach the pin 12 connecting these two elements to each other to separate them. The degree of security of the lock according to the invention is thereby reinforced compared to conventional locks.

The cylinder 1 is also associated with two protective caps 31 and 32, of substantially circular section, which fit around its respective two opposite end portions. These caps provide added security against break-ins.

A first cap 31, or inner cap, is intended to be inserted, by a rear face 33, around the end portion of the cylinder 1 which is intended to be located on the side of the inner door to the room, that is to say say the part ending in face 5, as shown in Figure 3.

A second cap 32, or outer cap, is for its part intended to be inserted, by a rear face 44, around the end portion of the cylinder 1 which is intended to be located on the side of the door outside the room, c ' that is, the part ending in side 4.

On its front face 34, which will be visible from the inside of the room in the final mounting position of the lock on the door 20, the cap 31 has a window 35 for access to the upper part of the end face 5 of the door. cylinder, as shown in Figure 4. This window is off-center on the front 34 of the cap, so that when the cap is disposed around the cylinder, the insertion opening of the key 6 of the latter is accessible through it. When the cap 31 is applied around the cylinder, only the upper part of the end face 5 of the latter is visible through the window, so that it is impossible for an uninformed observer to guess that the cylinder 1 is associated with the stirrup 9, and that the techniques of drilling or tearing of the usual locks are therefore inoperative.

The front face 34 is pierced with two holes 36 for the passage of screws 37 which are intended for a connection between the inner cap 31 and the outer cap 32 making them integral with one another. When the lock is mounted on the door, the caps do not touch, and they are connected to each other only by these screws 37.

The mounting method of the caps around the cylinder 1 - caliper assembly 9 is shown in Figure 8. The protective caps 31 and 32 frame this assembly by fitting around the cylinder 1 and the stirrup 9 for the cap 31, and the cylinder 1 only for the cap 32. The caps are fixed to each other by the screws 37, longitudinally with respect to the axis of the cylinder, so that all of these four elements is completely solidarized, and forms a single solid block.

The length of the cap 31, in the direction perpendicular to the plane of the door (in height in the figure), is preferably such that when it is fully pressed around the end portion of the cylinder 1, the latter being fixed in the stirrup 9, it comes to cover the legs 14 of the stirrup. Its diameter is substantially equal to the diameter of the orifice 30 formed in the outer upright 17 of the lock.

The cap 31 is associated with a cover 38 which is intended to cover its anterior face 34. The cover also comprises a window 39 for access to the upper part of the end face 5 of the cylinder, which coincides with the window 35 when is arranged in its proper position of use. Its role is to hide the internal constituents of the cap, and in particular the heads of the screws 37 which are inserted through the orifices 36. The cover 38 is preferably fixed on the cap 31 by clipping. The elastic effect is provided by an annular ring 40 engaged in a groove 41 dug for this purpose on the peripheral surface of the cap 31.

The cap 31 is in the form of a hollow part providing an internal cavity 42 for receiving the cylinder 1. This cavity has a shape and dimensions identical to those of the cylinder, as shown in FIG. 5 which represents the cap 31 seen by its rear face 33. It occupies the entire length of the cap 31, so that it can be fully inserted into the lock around the cylinder. In addition, the cavity 42 ends, at the front face 34, by the window 35 providing access to the insertion opening of a key 6.

The cavity 42 is associated, in its lower part, with a cavity 43 for receiving the tabs 14 of the stirrup 9. This latter has a depth less than that of the cavity 42, and preferably substantially equal to the thickness of the legs 14.

The orifices 36 for the passage of the fixing screws 37 to the second cap 32 also pass through the cap 31 throughout its length.

In the mounting position of the lock on a door 20, the inner cap 31 completely covers the end face 5 of the cylinder 1, and it is fitted entirely around the latter and around the legs 14 of the stirrup 9 which are fixed to the intermediate upright 18. The inner cap 31 and crosses, from the interior volume of the room, the outer upright 17, through the orifice 30 to reach the intermediate upright 18, on which it stops without crossing it.

The outer cap 32 has characteristics similar to those of the inner cap 31. Its diameter is substantially the same, while its length is greater. The latter is chosen to be very slightly greater than the thickness of the door on which the lock will be mounted, so that in its normal position of use, when it is fitted around the cylinder 1, the outer cap 32 crosses the entire thickness of the door, from the face of the latter outside the room to the internal upright 16 which is fixed against its inner face 19 to the room.

The cap 32 has a window 45 for access to the upper part 2 of the cylinder, which is in an eccentric position on its front face 46, that is to say the face that will be visible once the lock is mounted on a door .

It is associated with a cover 47 which is similar to the cover 38, that is to say in particular which has a window 48 for access to the upper part 2 of the cylinder, and which is mounted in the same manner on the cap, by clipping on an annular ring 49 disposed in a groove 50 hollowed for this purpose on the peripheral surface of the cap 32.

On its rear edge, over its entire circumference, the outer cap 32 is provided with a collar 51 of larger diameter, which is intended to be wedged in the lock between the face 19 of the door 20 inside the room and the amount 16. This collar prevents tearing of the outer cap 32 from outside the room when the lock is mounted on the door.

A circular pellet 52, with a diameter equal to the diameter of the window 45 of the cap 32, is advantageously designed to be mounted free to rotate against this window 45, between the cap 32 and the cylinder 1. It comprises a slot 53 which is arranged when mounting so as to coincide with the insertion opening of the key 6, so that it can reach this opening through it. This pellet 52, which rotates at the same time as the cylinder 57, has the role of preventing the drilling of the lock.

In addition, the outer cap 32 is associated with a sheath 54, in the form of a cylinder split along a generator, which is intended to envelop the end portion of the upper portion 2 of the cylinder which is inserted inside the cap. 32, so as to strengthen the lock at this location.

The outer cap 32 is just like the hood interior 31, preferably a hollow part, which maintains an internal cavity 55 for receiving the cylinder 1, as shown in Figure 7, which shows the outer cap 32 as seen by its rear face 44. The cavity 55 occupies the entire length of the cap 32 and it ends at the anterior face 46 by the window 45. It preferably has a shape and dimensions identical to those of the cylinder 1.

The outer cap 32 is pierced on its rear face 44, screw threads 56 which are intended to receive the screws 37 for fixing the two caps to one another.

When the lock is mounted on a door 20, the two caps are fixed to each other in a position in which they are both nested around an end portion of the cylinder. Fixing is carried out by means of the screws 37 which extend, from the inside to the room, through the orifices 36 of the inner cap 31, then through the respective holes 26 and 23 of the uprights 18 and 16, up to no screw 56 of the outer cap 32. They engage in the latter, thus ensuring a locking of the assembly around the cylinder. Since the heads of the screws are on the inside of the room, they can not be reached and unscrewed from outside the room. This feature confers an extra degree of security to the whole.

According to another preferred embodiment of the invention, which is illustrated in Figure 9, the stirrup 9 and the cap 31 are formed in a single piece. The stirrup 9 is then devoid of the lateral fixing lugs 14, and in such an advantageous configuration, it is not necessary to integrate in the lock an intermediate upright for fixing such lugs in the longitudinal direction. The structure of the lock according to the invention is thereby simplified. The stirrup 9 is held firmly in the lock, in the longitudinal direction, by means of the screws 37 which secure the two caps 31 and 32 to one another around the cylinder-stirrup assembly. The two caps 31 and 32 being in abutment against the external faces of the opposite amounts delimiting the fixed housing of the lock, this assembly is maintained solidly inside this case, thus making any tampering much more difficult.

The cap 31 is then provided, in its lower part, with one or two opposite transverse orifices 57, of threaded internal surface, for the passage of screws for securing, through it, the stirrup 9 with the radial extension. 3 of the cylinder 1. These orifices are arranged obliquely, from the bottom to the top in the position of use of the lock (that is from bottom to top in FIG. 9). The screws are preferably so-called break screws, whose tip-shaped head breaks when a large clamping force is exerted on it, and falls so that the cylinder is firmly held by the screw. The surface of the cylinder can be hollowed, at the contact points of the rupture screws, small holes with a depth of about 2 mm, to allow better fixing. This embodiment does not exclude that the cylinder is also fixed directly to the stirrup, by means of a pin 12, inserted through the holes 11 of the stirrup and 8 of the cylinder.

Such an embodiment is quite advantageous for an implementation on a metal door with recessed locking block, in which the door is hollow, on its face intended to be inside a room it firm, a receiving cavity of the elements of the security lock, and a sliding pan closing this cavity containing these elements.

The foregoing description clearly explains how the invention achieves the goals it has set for itself. In particular, it provides a lock that has a high degree of security, and that comes in an already pre-installed configuration that makes it easy and quick to mount on a door.

It nevertheless follows from the foregoing that the invention is not limited to the embodiments that have been specifically described and shown in the figures and that it extends on the contrary to any variant passing through means equivalents.

Claims (15)

Security lock comprising a cylinder (1) for housing a lock control mechanism having a radial extension (3) extending along its length for mounting in a fixed housing of said lock, and a stirrup (9) of fixing said cylinder (1) longitudinally in said lock, having a profile fitting over said radial extension (3) of said cylinder (1) and being secured to said cylinder in a predetermined longitudinal position, characterized in that it comprises a first protective cap (31) and a second protective cap (32) respectively fitting around the end portions of said cylinder (1), each having a window (35, 45) for access to an end face of said cylinder ( 1) and attaching to each other in this position. Lock according to claim 1, characterized in that said stirrup (9) is fixed to said radial extension (3) by means of a pin engaging in transverse direction. Lock according to claim 1 or 2, characterized in that said stirrup (9) occupies the entire height of said radial extension (3), and in that its upper face is hollowed with notches (13) allowing a rotating bit to pass ( 7) transmission of the control: locking carried by said cylinder (1). Lock according to any one of claims 1 to 3, characterized in that said two caps (31, 32) are fixed to one another by flanking said cylinder (1) and said stirrup (9) by means of screws (37) inserted into orifices (36) in said first cap (31) and threaded into orifices (56) in said second cap (32). Lock according to any one of claims 1 to 4, characterized in that said second cap (32) is associated with a pellet (52) being freely rotatable against said window (45) for access to an end face of said cylinder (1), between said window (45) and said cylinder (1), and having a slot (53) for access of a key to said locking mechanism, whereby said lock is protected against drilling at that location . Lock according to any one of claims 1 to 5, characterized in that said second cap (32) is associated with a reinforcing sheath (54) enveloping the end portion of an upper portion (2) of said cylinder (1) inserted inside said second cap (32). Lock according to any one of claims 1 to 6, characterized in that said second cap (32) has on its edge opposite said window (45) access to said cylinder (1) a collar (51) thicker making more difficult tearing when said lock is installed on a door (20). Lock according to any one of claims 1 to 7, characterized in that said first cap (31) and said second cap (32) are each associated with a cover (39, 47) covering its face (34, 46) carrying said window (45) for accessing said cylinder (1), with the exception of said window (45), said cover (39, 47) being fixed in particular around said corresponding cap (31, 32) by clipping on an annular ring ( 40, 49) engaging in a groove (41, 50) hollowed for this purpose on the peripheral surface of said cap (31, 32). Lock according to any one of claims 1 to 8, characterized in that said stirrup (9) and said first cap (31) are formed in a single piece, said stirrup (9) preferably fixing to said radial extension (3 ) through said first cap (31), by means of a pin engaging in transverse direction through an orifice (57) in said first cap (31). Lock according to any one of claims 1 to 8, characterized in that said stirrup (9) comprises lugs (14) for fixing in longitudinal support on a post (18) of said lock, in a position where said stirrup (9 ) is located between said fixing post (18) and an internal post (16) delimiting said stationary housing and intended to be applied against a face of a door (20). Lock according to claim 10, characterized in that said tabs (14) extend laterally on either side of the profile of said stirrup (9), and in that they are fixed to said fastening post (18) by screwing . Lock according to claim 10 or 11, characterized in that said two caps (31, 32) are fixed to one another by means of screws (37) inserted in orifices (36) formed in said first cap (31) and being screwed into holes (56) in said second cap (32), through holes (23, 26) provided for this purpose in said inner post (16) and said fixing post (18). Lock according to any one of claims 1 to 12, characterized in that said housing: fixed is delimited by two end uprights (16, 17), including an inner upright (16) intended to be applied against a face of a door (20) and an external upright (17) concealing the inside of said lock, and in that said external upright (17) is delivered in two parts (27, 28), allowing easy transport and passage of said dismounted lock in places of low space, these two parts preferably meeting at a mounting location of a handle opening and closing a door (20). Closing door of a room equipped with a security lock according to any one of claims 1 to 13, wherein said fixed housing is disposed on a face (19) of said door (20) inside said room, and in that said first cap (31) is located on the side of said door (20) inside said room, and said second cap (32) passes through the thickness of said door (20) to come to the side of said door ( 20) outside said room. Closing door of a room equipped with a security lock according to any one of claims 1 to 12, wherein the elements of said lock are arranged in a groove provided for this purpose in the thickness of said door, on a face of said interior door to said room.

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