EP1308585B1 - Lock with anti-burglary safety block - Google Patents

Abstract

The door lock's security mechanism (6) is surrounded for all or part of its length projecting from its housing (2) by an anti-tamper shield (12) shaped to receive the projecting portion (7a) of the mechanism's body and fixed to it by a grub screw (14) inserted through a hole beneath the lock rotor (9a). The security mechanism and shield assembly are fixed to the door by at least one screw (20) passing through the door and lock housing from the inside and screwed into a blind threaded hole in the shield.

Description

The invention relates to locks comprising at least a safety block and amounting either in a mortise of the door, either applied.

It is aimed more specifically, but not exclusively, locks equipped with a security block called European and composed of two coaxial cylinders arranged in body which, spaced apart to let a paneton or lantern, are connected to each other by a trigger guard inferior. In the current safety blocks, this bridge is crossed by a tapped hole intended to receive the end of a holding screw, arranged in a housing perpendicular to the doorway and coming out of it and into the housing for the block of safety.

It is well known that this tapped hole, which is made in the thinnest zone of the body of the block, weakens this block at the trigger guard.

When the lock is mounted on a door, it either in a mortise or applique, the safety block is either projecting or flush with the face exterior.

When it is protruding, a violent strike on he, exercised transversely to him, may lead to rupture of the connecting bridge and allow to continue burglary.

When the safety block is flush, it remains sensitive an axial strike that can drive it or an effort these two maneuvers with the aim of cause breakage of the trigger guard to continue burglary.

In order to reinforce the resistance of such locks to the break-in, it was proposed in the patent application FR 2 708 025 a lock comprising a safety block provided with a trigger guard crossed by a tapped hole in which a screw is engaged after having crossed one of the three orifices proposed by the two studs of a shield of reinforcement positioned around the safety block. However, such a lock always presents a fragility in the trigger guard due to the presence of the hole tapped.

The present invention aims to provide a lock with block of safety remedies for this and having improved burglar resistance.

For this purpose, in the burglar-proof lock according to the invention, the part outer body of the safety block is surrounded, on all or part of its protruding length of the lock casing, by a ring shield marrying the external profile of this body and linked to it by at least one connecting member, such as pin or grub screw, passing through this ring and penetrating a housing arranged in the body part of the protruding safety block of the lock housing, below the rotor of the cylinder, while the fixing on the door of the safety-shield block assembly is ensured by at least one screw, engaged from inside the door and through the door and the housing by housing cylinders, said screw being screwed into a threaded bore formed in the shield and opening out of the posterior face of it.

With this arrangement, the part of the outer safety block is enveloped by a shield ring that strengthens it and makes it less sensitive to a violent strike. Moreover, the fastening of the assembly by at least one screw Plating the shield ring against a flat surface of the housing, or the door, reduces the risk of sinking the cylinder body. This fixation presents also the advantage of allowing the removal of the tapped hole in the bridge connecting the outer part to the inner part of the safety block and, in Consequently, increases the resistance of this bridge.

In one embodiment, the grub screw, fixing the shield on the body of the safety block is arranged in a tapped bore transversely in the ring and is protected by an insert made of high strength, penetrating transversely into the tapped bore for the screw and disposed in a housing from the back side of the shield to this tapped bore.

This arrangement, which is applied when the shield ring is not not recessed in the door, opposes any access to the screw ensuring its fixation on the cylinder body.

To meet the safety needs of shipyards using specific safety blocks, by a different combination than the blocks subsequently placed, and to allow the temporary fixing of these blocks while said blocks and locks are in accordance with the invention, are not fixable by a screw perpendicular to the field of the opening and can not be fixed by their shield, not necessary for a construction site, in a form embodiment of the invention, the lock housing comprises at least one housing which, arranged parallel to the direction of engagement of the security block in this housing and near the opening provided for the passage of the block, bearing shape for the cylindrical rod of a temporary wedging device, a device whose locking head is at least provided with an eccentric bearing adapted, by rotation, to occupy either a clearance position, in which she is out of the engagement path of the safety block in the housing, a stance position, in which it bears against the body of this safety block and ensures its wedging against the housing.

Thus, when organizing a construction site, fixing each block is provided by the only wedging device, whose head is rotated relative to to the housing and so that its eccentric reach comes into contact with the body safety block and plate this block against the edges of the lights in the housing and in its cover for the passage of this block.

Figure 1 est une vue en perspective éclatée montrant les différents éléments du bloc de sûreté avant son montage sur un boítier de serrure encastrable dans la mortaise d'une porte,

Figure 2 est une vue en perspective par l'arrière montrant les différents éléments participant au montage du bouclier sur le corps d'un cylindre,

Figure 3 est une vue en coupe transversale du bouclier, lorsqu'il est monté sur le corps d'un cylindre,

Figure 4 est une vue en perspective d'une autre forme de réalisation du bouclier,

Figure 5 est une vue en perspective éclatée montrant une serrure à larder dans laquelle le blocage du bloc de sûreté est assuré par dispositif de calage temporaire,

Figures 6 et 7 sont des vues en élévation, respectivement en plan par-dessus et par l'arrière d'une forme d'exécution du dispositif de calage seul,

Figures 8 et 9 sont des vues partielles et en élévation du dispositif quand il est monté sur un boítier de serrure et lorsqu'il est, respectivement, en position de dégagement et en position de blocage,

Other features and advantages will emerge from the description which follows with reference to the attached schematic drawing showing several embodiments of the lock according to the invention.

Figure 1 is an exploded perspective view showing the various elements of the safety block before mounting on a lock housing recessed in the mortise of a door,

Figure 2 is a perspective view from the rear showing the various elements involved in mounting the shield on the body of a cylinder,

Figure 3 is a cross-sectional view of the shield, when mounted on the body of a cylinder,

Figure 4 is a perspective view of another embodiment of the shield,

FIG. 5 is an exploded perspective view showing a mortise lock in which the locking of the safety block is ensured by a temporary setting device,

Figures 6 and 7 are views in elevation, respectively in plan over and behind of an embodiment of the wedging device alone,

Figures 8 and 9 are partial and elevational views of the device when it is mounted on a lock housing and when it is, respectively, in the release position and in the locking position,

In FIG. 1, the reference numeral 2 designates general the housing of a lock embedded in the mortise of an opening and comprising a latch bolt 3 and a dead bolt 4, operable by the 5 of a safety block 6. The safety block shown is of type European Union and is composed of a 7-part body 7a, 7b connected by a 8, each part of the body forming an envelope for a cylinder 9a, 9b actuable by a key.

In known manner, the safety block 6 is put in place in the door after the lock case has been engaged in the mortise of this door. This implementation is carried out by transversal engagement in housings in the door and the housing and shaped like those represented in 10 in FIG.

According to the invention, the part 7a of the safety block, which contains the 9a cylinder accessible from the outside by a key, is surrounded by a ring shield 12 whose inner housing 11 matches its outer profile. The profile outside this ring is oblong, as shown in FIGS. 1 and 2, circular or any other form. This ring-shield 12 is made in a harder material than that constituting the body 7a, 7b and, for example alloy metallic, composite materials. It has a thickness that depends on the type of lock and which may be equal to, or less than, the length of the body part 7a on which it is mounted.

For its connection with this body 7a, the shield ring 12 comprises a tapped bore 13 which, in the embodiment shown in FIG. has a horizontal longitudinal axis arranged perpendicular to the axis longitudinal of the safety block 6 and substantially half thickness of the ring 12. This threaded bore 13 is intended to receive a grub screw 14 which the anterior extremity, shouldered or not, is intended to penetrate into a smooth housing 15 formed in the body part 7a and below the corresponding cylinder 9a.

As shown in Figure 2, the shield 12 is also crossed in its thickness by a blind bore 16, opening from the face posterior 12a of the shield and from this face to the threaded bore 13. This bore 16 is intended to receive a cylindrical burglar-proof pin 17, made of high-strength material. Figure 3 shows that when this pin 17 is placed in this housing 16 and penetrates substantially diametrically in the housing 13 for the grub screw 14, it prevents to access the cavity 14a formed in this screw and makes it difficult to destruction by drilling.

In a variant, not shown, this pin is replaced by an insert, for example by a plate of resistant material, metal, composite or other. This insert is introduced in a housing similar to that 16 and whose cross section is identical to his.

In the embodiment shown, the shield ring 12 is integral with a gutter 18 which projects from its posterior face 12a and is intended to come below and in contact with the bridge 8, connecting the two parts 7a and 7b of the body of the safety block. As shown in Figure 1, at least the cover 2a of the housing 2 comprises a cutout 21 allowing the engagement of the gutter 18 in the housing.

Finally, the shield ring 12 has at least one, and preferably two, tapped holes 19 for cooperating with a fixing screw 20. Each of these tapped holes is one-eyed and opens out from the posterior face 12a of the shield. The two holes are arranged on both sides of the plane vertical median of this shield and, in the shown embodiment, below parts of the body containing the cylinders.

When the lock case 2 is put in place in its mortise, the whole safety block 6 - ring shield 12 is put in place and then is fixed by means of the two screws 20 which are engaged by the interior of the door. Each of them successively crosses a housing provided in the door, a housing 25 formed in the housing 2 and its lid 2a, and finally a housing formed in the door, before screwing into the threaded bore 19.

To avoid that, under the action of the tightening of these two screws 20, the two side walls of the housing 2 are deformed, a spacer 22 is disposed in this housing, as shown in Figure 1. This spacer, metal or plastic, has passages 23 for the screws 20, but also a groove 24 for receiving the gutter 18 for reinforcing the safety block.

The ring shield can, depending on the thickness of the door, take support directly on the housing, to take support on the bottom of a housing realized in the door, and in this case, be flush with the front of the door or to overflow the door.

Figure 4 shows a shield that is longer than the one shown in Figures 1 and 2 and which is intended, by its rear face 12a, to come to bear against the lock case, by its body to be partially embedded in the thickness of the door, and by its front part to form a protrusion by compared to the front of the door.

The safety block equipped with such a shield ring is particularly resistant to violent break-in attempts, which that is the direction of these strikes, and, through its gutter, improves the resistance of the bridge 8, which is already improved by the removal of the tapped hole on weakening in the current safety blocks. At the end of assembly, the shield, the safety block, and the lock case form a more rigid and more resistant to extraction and depressing, which improves resistance to burglary.

In an alternative embodiment, not shown, the grub screw 14 is screwed into a threaded bore 13 which opens out from the rear face 12a of the ring 12 and whose longitudinal axis is oblique with respect to the longitudinal axis from the body. Of course, the axis of the housing 15 receiving the screw 14 in the body is also oblique since coaxial with that of the bore 13.

This arrangement avoids providing a safety insert 17 since the access to the screw 14 is hidden.

In another variant embodiment, not shown, the screw 14 is replaced by a pin which, cylindrical, conical or expandable, is forcibly engaged in the bore 13, then not tapped, and in the bore smooth 15. The longitudinal axes of these two bores are either radial, as shown in Figures 2 and 3, or oblique, as indicated above. In that case and preferably, the bore formed in the shield 12 opens out of the face posterior 12a thereof.

The embodiment shown in FIGS. 5 to 9 relates to a wedging device 26 for temporarily blocking the safety block 6, for example during a construction site whose safety is ensured by blocks of according to the invention, without shield 12 and without the possibility of fixing by the traditional screw crossing perpendicularly the field of the opening. This device of is composed of a cylindrical rod 27, integral with a head 28, also cylindrical but whose longitudinal axis is eccentric with an E value relative to the longitudinal axis of the stem, as shown in Figure 7. This head has a footprint 29 for a tool, and for example, a footprint hexagonal and, in its most eccentric part, a flat part. variant embodiment, not shown, the head 28 is in cam shape of which the part farthest radially from the axis of the rod 27 is disposed at the flat spot 30.

With this arrangement, when the housing is mounted on a frame and that the safety block 6 is engaged in the housing 10 of the lock, the temporary blocking of this safety block is ensured, on the inner part of the opening, by the engagement of the rod 27 in a housing bearing and by rotation of the device. In the embodiment shown, the landing stage of the rod 27 is constituted by one of the housing 25 provided in the housing and the cover for the passage of the shield fixing screws. In variant, not shown, the bearing is formed by a housing different from those 25 of the housing 2.

FIG. 9 shows that the rod 27 is first positioned way that its flat 30 is opposite the housing 10 for the passage of the safety block and in a position called engagement, allowing to adjust the longitudinal position of the safety block 6 in the lock. Then, and as shown in FIG. 8, the head 28 is rotated, for example in the direction of the arrow 31 of Figure 8, so that its flat 30 comes to block body contact 6. In this position, the head 28 plates the block of safety against the edges 10a housing10 and ensures blocking of the block in the lock.

In another embodiment, not shown, which can be used to secure, temporarily or permanently, a lock, to plated or larder, with safety block, the wedging device 26 is arranged completely in the housing of the lock. In this case, the cylindrical rod 27 is mounted freely in rotation in bearings in the trunk and the latter or its lid has an opening for accessing the means 29 rotational drive formed in the head 28. This arrangement imposes to make, in the door, a hole to access the means of training 29 of the head, but this hole can be easily hidden, on one side, by a plate of cleanliness, integral or not with the operating handle of the latch bolt, and, on the other side, by the ring-shield 12.

Whatever its embodiment, the wedging device 26 allows, in a simple and fast way, to ensure the connection of a safety block with the housing of a lock to obtain a temporary fixation or permed.

The lock that has just been described has a safety block with two cylinders, but it is obvious that the invention also applies to a block with an outer cylinder and a button, or other actuating means inside.

Claims (10)

1. Lock having a burglar-proof security unit comprising a casing (2) with its operating mechanism and at least one transverse through-clearance (10) for the body (7, 7a, 7b) of said security unit (6), which is equipped with at least one cylinder (9a) which can be operated from the outside by a key, in which lock the body (7) of the security unit in its mounting position is disposed in a clearance arranged in the door and emerging from the outer face of the latter and wherein the outer part (7a) of the body of the security unit (6) is surrounded, over all or part of its length which projects from the lock casing (3), by a shield-ring (12) which closely follows the outer profile of the said body (7a) and is linked to it by at least one linking component such as a pin or headless screw 14, while the security unit (6)/shield-ring (12) is fixed onto the door in its mounting position by at least one screw (20) which is inserted from the inside of the door and passes through said door and the casing (6) via cylindrical clearances, the said screw being screwed into a tapped bore (19) which is arranged in the shield-ring (12) and emerges from the back face (12a) of the latter, characterised in that the linking component (14) passes through the said shield-ring (12) and penetrates into a clearance (15) arranged in that part of the body of the security unit which projects from the lock casing, below the rotor of the cylinder.
2. Lock having a burglar-proof security unit according to claim 1, characterised in that the headless screw (14) fixing the shield (12) onto the body (7a) of the security unit (6) is disposed in a tapped bore (13) arranged transversely in the shield-ring (12) and is protected by an insert (17) which is made of high-strength material, penetrates transversely into the tapped bore (13) and is disposed in a clearance (16) which extends from the rear face (12a) of the shield (12) to the said tapped bore (13).
3. Lock having a burglar-proof security unit according to claim 1, characterised in that the shield (12) has, projecting from its rear face (12a), a reinforcing gutter (18) which penetrates into the lock casing (3) via a cutout (21) and passes below, and in contact with, the bridge (8).
4. Lock having a burglar-proof security unit according to claim 1, characterised in that each of the screws (20) for fixing the security unit (6)/shield (12) unit onto the door passes through a reinforcing distance-piece (22) disposed in the lock casing (3) in order to prevent deformation of the two lateral walls of the said casing.
5. Lock having a burglar-proof security unit according to claim 1, characterised in that the shield-ring (12) is made of material which is at least as strong as that which constitutes the body (7, 7a) of the security unit (6).
6. Lock having a burglar-proof security unit according to claim 1, characterised in that the tapped bore (13) is arranged in the shield-ring (12) in such a way that it emerges from the rear face (12a) of the said ring and has an oblique longitudinal axis which is coaxial with that of the clearance (15) arranged in the body.
7. Lock having a security unit according to claim 1, characterised in that its casing (6) has at least one clearance (25) which, disposed parallel to the direction of insertion of the security unit (6) in the said casing and close to the opening (10) provided for the passing-through of said unit, forms a bearing for the cylindrical shank (27) of a temporary wedging device (26) whose jamming head (28) is at least provided with an eccentric bearing surface (30) which is capable, as a result of rotation, of occupying either a position of disengagement, in which it is outside the path of insertion of the security unit (6) in the casing, or a wedging position, in which it rests against the body of the said security unit (6) and wedges the latter against the casing.
8. Lock having a security unit according to claim 7, characterised in that the clearance forming a bearing for the temporary wedging device (26) is one of the clearances (25) provided in the casing (6) for the passing-through of the screws (20) for fixing the shield (12).
9. Lock having a security unit according to claim 7, characterised in that the shank (27) and the head (28) are disposed inside the casing (2) which is equipped with bearings which guide the rotation of said shank (27) and with an opening which makes it possible to gain access to the head (28) in order to drive it in rotation.
10. Lock having a security unit according to claim 1, characterised in that the component for linking the shield (12) with the part (7a) of the body (7) is constituted by a pin which is forcibly fitted into the bores arranged in the shield (12) and in the said part (7a).

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