EP1580355A1 - Door lock with a reinforced case - Google Patents

Abstract

The lock has an armor plate (22) and a blocking unit (32) covering an inner part (14) of a turret (12). A fixing screw (37) traversing a case (2) fastens the plate (22) to the blocking unit. The plate (22) contacts with end plates (3) of the case via its rear side equipped with two snugs traversed by an axial boring. The snugs are housed in recesses (17) made in a layer of the end plates situated with respect to the rear side.

Description

The present invention relates to a door lock having a trunk crossed by a barrel provided with a rotating bit provided to push back a suitable groove, under the action of an elastic return means, to come into engagement with teeth presented by a tail of a bolt of conviction.

In order to fight against attempts to drill the chest, which finally allow a burglar to access the inside of the lock by to unlock the locking bolt, it has already been proposed, for example in GB 1 548 298, to report protection plates on both sides of a standard lock. However, in the case of a mortise lock, the mortise must be enlarged so to authorize the introduction of the lock equipped with its armor.

Another solution consists in fixing plates of protection on both sides of the door to be protected, substantially at the level of the lock. The disadvantage is that these plates being immediately accessible to the burglar, the protection conferred by them is relatively minimal.

Other locks, such as those described in the documents DE 1 703 058 and FR 2 711 713, provide to dispose of the parts main lock in a cage housed in the trunk. However, the major disadvantage of this type of lock is that the number of successive steps required to assemble a lock is too high. Indeed, at first, all the parts to protect must be introduced into the cage, then, in a second step, this last must be positioned and secured inside the trunk.

The present invention aims to overcome the disadvantages previously mentioned, and consists of a door lock comprising a trunk crossed by a barrel equipped with a rotary bit provided for push a suitable groove, under the action of an elastic return means, to come into engagement with teeth presented by a tail of a bolt of condemnation, characterized in that the trunk is made using two complementary flasks each comprising at least one hardness zone reinforced located respectively opposite the groove and facing the tail of the bolt.

According to a preferred embodiment of the invention, each flange comprises two separate covers, one of which is made of a material with increased hardness. Preferably, each bonnet with reinforced hardness is made of cast steel, and each associated cover is made using a sheet metal stamped metal. In addition, each reinforced hardness hood has a greater thickness than the associated cover.

Advantageously, each bonnet with reinforced hardness is extended by at least one lug of reduced thickness for fixing the associated hood. In addition, to allow the hood to hardness reinforced and hood associated with being substantially located in the same plane, the thickness of each leg is chosen substantially equal to the difference in thickness measured between hardened bonnet and associated hood.

Advantageously, each bonnet with reinforced hardness has an internal face equipped with at least one protuberance adapted to protect the throat. The inner face of the reinforced hardness hood facing the For example, the groove may have a protruding element overhanging the groove. The latter is preferably surmounted by a nipple on which is the elastic return means, and the projecting element has advantageously a recess serving as a housing for the return means elastic.

In addition, the inner face of the reinforced hardness hood facing the throat can be equipped with two longitudinal ribs framing the throat.

However, a burglar wishing to enter a room often starts with fracturing the barrel to extract it from the chest of the door lock. Once this task has been accomplished, the burglar has access to the internal organs of the lock and can therefore easily proceed to unlocking the bolt previously housed in the striker fixed in the door jamb to protect. For this, the burglar raises the throat whose teeth cooperate with the teeth presented by the tail of the bolt. The The bolt is no longer locked in translation and the burglar can place it in his rest position.

In order to solve this problem, a lock according to the invention can include a breastplate intended to cover a first part of the barrel opening out of the room to be protected, a blocking element suitable for enclose a second part of the barrel opening inside the room to protect, and fastening means provided to cross the trunk and allow the attachment of the armor to the locking element, said armor being intended to come into contact with the flange located outside the room to be protected by via a rear face equipped with at least two lugs located in the extension of the cuirass and each traversed by an axial bore, and each of these pins being adapted to be housed in a recess corresponding dug in the thickness of the flange located opposite the face back of the cuirass.

Thus, the fastening means not being accessible since outside the premises, the burglar can only access the barrel after having fractured the cuirass.

Advantageously, each recess comprises a bottom crossed by an orifice intended to be located opposite the axial bore presented by the corresponding ergot. In addition, in the lower part of the cuirass, the rear face is preferably provided with a nose designed to extend under the chest.

La figure 1 est une vue en perspective d'une serrure de porte selon l'invention, avec enlèvement d'un capot à dureté renforcée.

La figure 2 est une vue en perspective partielle éclatée des capots constitutifs des flasques de la serrure de porte représentée à la figure 1.

La figure 3 est une vue en perspective de la serrure de porte représentée à la figure 1, avant insertion du barillet et de la cuirasse.

La figure 4 est une vue en perspective à échelle agrandie de la cuirasse associée au barillet.

La figure 5 est une vue à échelle agrandie de la face interne de la plaque de protection de la serrure de porte représentée à la figure 1.

La figure 6 est une vue à échelle agrandie de la face interne de la gorge de la serrure de porte représentée à la figure 1.

Les figures 7 et 8 sont des vues avant et arrière d'un ensemble comprenant le pêne de condamnation sur lequel sont rapportées la gorge et la plaque de protection.

La figure 9 est une vue en perspective de l'ensemble représenté aux figures 7 et 8, lorsque seule la plaque de protection est soulevée.

La figure 10 est une vue en perspective de l'ensemble représenté aux figures 7 et 8, lorsque seule la gorge est soulevée.

La figure 11 est une vue en perspective de l'ensemble représenté aux figures 7 et 8, au cours du pivotement de la plaque de protection.

La figure 12 est une vue en perspective de l'ensemble représenté aux figures 7 et 8, après que la plaque de protection a totalement pivoté.

The invention will be better understood with the aid of the detailed description which is set out below with reference to the appended drawing in which:

Figure 1 is a perspective view of a door lock according to the invention, with removal of a reinforced hardness bonnet.

FIG. 2 is an exploded partial perspective view of the constituent covers of the flanges of the door lock shown in FIG.

Figure 3 is a perspective view of the door lock shown in Figure 1, before insertion of the barrel and the armor.

Figure 4 is an enlarged perspective view of the armor associated with the barrel.

FIG. 5 is a view on an enlarged scale of the internal face of the protective plate of the door lock shown in FIG.

FIG. 6 is an enlarged view of the internal face of the groove of the door lock shown in FIG.

Figures 7 and 8 are front and rear views of an assembly comprising the locking bolt on which are reported the groove and the protection plate.

Figure 9 is a perspective view of the assembly shown in Figures 7 and 8, when only the protection plate is raised.

Figure 10 is a perspective view of the assembly shown in Figures 7 and 8, when only the groove is raised.

Figure 11 is a perspective view of the assembly shown in Figures 7 and 8, during the pivoting of the protection plate.

Figure 12 is a perspective view of the assembly shown in Figures 7 and 8, after the guard plate is fully rotated.

A door lock 1 according to the invention, as shown in Figures 1 to 3, comprises a box 2 made with two flanges 3 assembled to each other.

More precisely, each flange 3 is decomposed, on the one hand, into a top cover 3a, and secondly, a lower cover 3b hardness strengthened. Each of the upper covers 3a is made using a sheet metal stamped metal, and each of the lower hardened reinforced bonnet 3b is made of cast steel. In addition, each lower cover 3b with increased hardness has a thickness greater than that of the upper cover 3a associated.

In addition, each of the two lower covers 3b is extended towards the high by a leg 4 of reduced thickness, intended to be covered by the upper cover 3a associated, and used for fixing said upper cover 3a associated. For this, one of the two legs 4 is extended by a pin 5 adapted to come and stay in a mortise 6 presented by the other leg 4. In addition, each of the two legs 4 carries a perforation 7 in which can be inserted a fixing screw 8 to connect the two legs 4 to each other. For allow the lower cover 3b and the associated upper cover 3a to be substantially located in the same plane, the thickness of each leg 4 is chosen substantially equal to the difference in thickness measured between said lower cover 3b and said associated upper cover 3a.

The chest 2 is attached to a headrest 9, and contains the parts well known to those skilled in the art usually used to ensure the locking and unlocking a locking bolt 10.

Each lower cover 3b has, in the lower part, a central opening 11 adapted to the section of a barrel 12, the latter having a first part 13 and a second part 14 separated one from the other by a medial blade 15 rotating in rotation. Each hood lower 3b also has a clearance 16 under the opening Central 11.

In addition, each lower cover 3b has two recesses 17 arranged on either side of the central opening 11, each recess 17 being hollowed out in the thickness of the lower cover 3b and having a bottom 18 traversed by an orifice 19.

Once the barrel 12 is properly engaged in the 2, the bit 15 is housed in said case 2, and the first part 13 and the second portion 14 of the barrel 12 protrude respectively on one side and the other of the said safe 2. We will assume, in the remainder of the statement, that the first part 13 is intended to protrude outside the premises to be protected (not shown), and that the second portion 14 is intended to protrude from inside the premises to be protected.

In a conventional manner, the bit 15 is intended to cooperate with a groove 20 when it is rotated with a key 21 introduced in the barrel 12.

Furthermore, a cuirass 22 is made of a material at the hardness higher than that of the material in which the barrel 12 is shaped, and has a front face 24 intended to be oriented towards the outside, a side wall 25 designed to cover the first portion 13 of the barrel 12, and a rear face 26 intended to come into contact with the lower cover 3b located at outside the premises to be protected.

More precisely, referring in particular to FIG. observes that two axial pins 27 of thin thickness project partially bottom of the rear face 26 of the breastplate 22, and are arranged on the another of a central opening 28 adapted to the first part 13 of the barrel 12. In addition, each of these two lugs 27 is traversed by a bore axial threaded.

Moreover, in the lower part of the cuirass 22, and more precisely under the central opening 28, the rear face 26 is provided with a nose 30 whose length is substantially equal to the thickness of the trunk 2. This nose 30 is also traversed by a tapped axial bore 31.

The cuirass 22 is then reported on the first part 13 of the 12. Specifically, each of the two pins 27 is housed in the recess 17 corresponding to the lower cover 3b located opposite the armor 15, and the nose 30 passes through the clearance 16 provided under the opening central 11 of the trunk 2. In doing so, each lug 27 abuts against the bottom 18 of the recess 17, and the axial bore 29 of each lug 27 is arranged opposite the orifice 19 presented by said corresponding bottom 18.

A blocking element 32 is then reported around the second part 14 of the cylinder 12. This locking element 32 is produced under the form of a washer having a central opening 33 adapted to the section barrel 12, two lateral orifices 34 arranged on either side of the central opening 33, and an orifice 35 located below said opening 33. Each of the two orifices 34 is placed in the alignment of a on the other hand, openings 19 presented by the recesses 17, and on the other hand, axial bores 29 presented by the pins 27. Similarly, the orifice 35 is placed in alignment with the axial bore 31 presented by the nose 30.

A fixing screw 37 provided with a head 38 can then be inserted in each of the orifices 34, 35. As can be deduced from the 3, these fixing screws 37 are respectively screwed into the bores axial 29 of the lugs 27 and in the axial bore 31 of the nose 30, and allow finally to press the locking element 32 against the lower cover 3b which face him.

A protection device according to the invention is therefore particularly advantageous since, in addition to the fact that the pins 27 are located outside the trunk 2 and are therefore not likely to interfere with the deflection of the bit 15, the fixing screws 37 which ensure the attachment of the armor 22 to the locking element 32 are not directly accessible from the outside. Indeed, these fixing screws 37 do not can be damaged only to the extent that the burglar has previously destroyed the pins 27 which are masked by the 17. In addition, even in this case, the armor 22 remains solidary of the locking element 32 via the nose 30 which extends under the chest 2. Finally, the armor 22 is protected against attempts of tearing downwardly and upwardly, respectively, to the lugs 27 held blocked in the recesses 17, and the nose 30 housed in the clearance 16.

In order to further strengthen the protection device according to the invention, and as shown more particularly in FIG. 4, a recess is dug in the lower part of the cuirass 22 in the vicinity of its rear face 26, and this recess is filled by means of a material 39 with higher hardness that of the material used to shape the cuirass 22.

As shown in FIGS. 1 and 6 to 8, this groove 20 is constituted by a plate having an inner face 40 arranged on one side of the tail 41 of the bolt 10. This groove 20 has an oblong slot 42 crossed by a transverse axis 43 integral with the trunk 2. In addition, partly high of its internal face 40, the groove 20 comprises, on the one hand, a shoulder 44 protruding into which is hollowed a recess 45 in order to constitute a housing adapted to cooperate with the teeth 46 of the tail 41 of the 10, and on the other hand, a stop element 47, separated from the shoulder 44, and having a substantially planar contact surface 48. This shoulder 44 is surmounted by a pin 49 on which is centered a first end a compression spring 50.

The compression spring 50 is housed in a recess 51 a first projecting element 52 formed in the lower cover 3b located face at the groove 20, and has a second end bearing against a stop 53 horizontal overhanging the recess 51. A second element in projection 54 is formed above the first, and these two protruding elements 52, 54 allow to sandwich a third element 55 making projection of the other lower cover 3b. It is therefore almost impossible to access to the compression spring 50 during an attempted break-in.

For added security, as shown in Figure 2, the inner face of the lower cover 3b located next to the groove 20 is equipped with two longitudinal ribs 56 preventing any lateral displacement of said throat 20.

As shown more particularly in FIGS. 1, 5, 9, 11 and 12, a protection plate 57 provided with an internal face 58 is reported on the other side of the tail 41 of the bolt 10. This protection plate 57 has an oblong slot 59 traversed by the integral transverse axis 43 2. In addition, in the upper part of its internal face 58, the plate of protection 57 has a protuberance 60 comprising a tooth 61 extended by a lug 62.

In addition, a groove 64 parallel to the tail 41 of the bolt 10 is dug at the top of the protuberance 60 and constitutes a housing apt to accommodate a first branch 65 of a torsion spring 66 placed around a fixed element 67 integral with the door lock 1. As shown in FIG. 1, the second branch 68 of this torsion spring 66 is provided for abut against the return 69 of one of the two lower covers 4. This fixed element 67 overhangs the groove 20 and the protective plate 57, and is offset with respect to these.

As shown in FIGS. 1, 7 and 8, in operation normal, the groove 20 and the protection plate 57 are returned, respectively by the compression spring 50 and the torsion spring 66, towards the tail 41 of the bolt 10. In this position, one of the teeth 46 of the lug 41 of bolt 10 is housed in the recess 45 presented by the shoulder 44 of the groove 20 so as to lock the bolt 10 in translation, the tooth 61 of the protuberance 60 rests on the shank 41 of the bolt 10, and the lug 62 protrusion 60 is inserted between the shoulder 44 and the stop member 47 arranged in the groove 20. More specifically, the lug 62 is intended to come resting against the substantially flat contact surface 48 of the element of stop 47.

As can be seen from Figure 1, when a person key 21 into the barrel 12 in order to lock or unlock the bolt 10, the blade 15 housed in the trunk 2 is rotated, or clockwise, or counterclockwise. In doing so, the bit 15 causes a ring 70 to rotate and comes simultaneously in contact with the groove 20 and the protection plate 57. During the first half of its race, the blade 15 exerts constraints in the lower part of the groove 20 and the protection plate 57, and causes the translational movement upward of the latter against respectively of the compression spring 50 and the torsion spring 66. during this translation upwards, the groove 20 and the protection plate 57 remain motionless relative to each other, and it follows that the ergot 62 rests against the contact surface 48 of the abutment element 47. When the bit 15 reaches the highest point, the teeth 46 of the tail 41 of the bolt 10 are disengaged from the groove 20, and the bolt of condemnation 10 can then be driven in translation by said blade 15 during the second half of his race. During this second half of stroke, the groove 20 and the protective plate 57 are then animated by a translation movement downwards under the effect of the compression spring 50 and the torsion spring 66 which gradually relax. When the bit has reached the lowest point, one of the teeth 46 of the tail 41 of the bolt 10 is housed in the recess 45 of the groove 20, and it follows that the bolt 10 is locked in translation. As before, during this translation down, the groove 20 and the protective plate 57 remain immobile relative to each other, and therefore the lug 62 remains in bearing against the contact surface 48 of the abutment element 47.

On the other hand, during an attempted break-in, the risk that the burglar manages to simultaneously move the throat 20 and the plate of protection 57 is very weak. In fact, given the small size of the contact surface 48 of the abutment element 47, the slightest relative displacement of the protection plate 57 with respect to the groove 20, as shown in FIG. FIG. 9, or of the groove 20 with respect to the protection plate 57, as shown in FIG. 10, causes the disengagement of the spigot 62 from the stop element 47. The protection plate 57 is then driven in rotation by the first branch 65 of the torsion spring 66 which seeks to loosen. As shown in Figure 11, to allow free rotation of the protection plate 57 about the axis 43, a clearance 71 is advantageously arranged at the rear of the tail 41 of the bolt 10. Finally, as shown in Figure 12, when the protection plate 57 has completely rotated around the axis 43, the tooth 61 is found on the trajectory of the tail 41 of the bolt 10 and therefore prohibits any return back of the latter. Such a device protection of the groove 20 of the door lock 1 thus makes it possible to fight effectively against attempted break-ins.

Although the invention has been described in connection with examples particular achievements, it is quite obvious that it is by no means that it includes all the technical equivalents of the means described as well as their combinations if they fall within the scope of the invention.

Claims (13)

Door lock (1) comprising a box (2) traversed by a cylinder (12) provided with a rotating bit (15) designed to push a groove (20) adapted, under the action of an elastic return means ( 50), coming into engagement with teeth (46) presented by a shank (41) of a locking bolt (10), characterized in that the trunk is made with the aid of two complementary flanges (3) comprising each at least one zone with enhanced hardness located respectively opposite the groove and facing the tail of the bolt. Door lock (1) according to claim 1, characterized in that each flange (3) comprises two separate covers (3a, 3b), one of which is made of a material with enhanced hardness. Door lock (1) according to claim 2, characterized in that each cover (3a) is made using a stamped metal sheet, and in that each cover (3b) with reinforced hardness is made of cast steel . Door lock (1) according to any one of claims 2 or 3, characterized in that each bonnet (3b) of reinforced hardness has a thickness greater than that of the cover (3a) associated. Door lock (1) according to claim 4, characterized in that each cover (3b) of reinforced hardness is extended by at least one lug (4) of reduced thickness for fixing the cover (3a) associated. Door lock (1) according to any one of claims 2 to 5, characterized in that each bonnet (3b) of reinforced hardness has an inner face equipped with at least one protrusion (52, 55, 56) capable of protecting the throat (20). Door lock (1) according to claim 6, characterized in that the inner face of the hood (3b) with reinforced hardness located opposite the groove (20) has a projecting element (52) overhanging the groove. Door lock (1) according to claim 7, characterized in that the groove (20) is surmounted by a stud (49) on which the elastic return means (50) is connected. Door lock (1) according to any one of claims 7 or 8, characterized in that the projecting element (52) has a recess (51) serving as a housing for the elastic return means (50). Door lock (1) according to any one of claims 6 to 9, characterized in that the inner face of the cover (3b) with reinforced hardness located opposite the groove (20) is equipped with two longitudinal ribs (56) flanking the throat. Door lock (1) according to any one of claims 1 to 10, characterized in that it comprises a cuirass (22) provided to cover a first portion (13) of the barrel (12) opening out of the room to protect, a locking element (32) adapted to grip a second portion (14) of the barrel opening inside the room to be protected, and fixing means (37) provided to pass through the trunk (2) and allow the attachment of the armor to the locking element, said armor being intended to come into contact with the flange (3) located outside the room to be protected by means of a rear face (26) equipped with at least two lugs (27) located in the extension of the armor and each traversed by an axial bore (29), and each of these lugs being adapted to be housed in a corresponding recess (17) dug in the thickness of the flange located in look at the back side of the cuirass. Door lock (1) according to claim 11, characterized in that each recess (17) comprises a bottom (18) through which a hole (19) is provided which faces the axial bore (29) presented by the corresponding pin (27). Door lock (1) according to claim 12, characterized in that , in the lower part of the armor (22), the rear face (26) is provided with a nose (30) designed to extend under the trunk ( two).

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