Security device for lock cylinder

Abstract

 Security device for door-related lock cylinders (1), which consist of an internal stator (5) and an external stator, connected at the bottom by a central zone (2), and the set contains blocking systems, which are, respectively, the internal rotor (3) and the external rotor (4) acting together with a mobile clutch (15) in the rotary cam (8), with a security mechanism comprising elements of axial displacement of the rotary cam (8) and radial and axial blocking of the same when the external stator and the external rotor (4), including the mobile clutch (15), have been eliminated.

Description

[0001] The present invention to a security device for lock cylinders designed especially for cylinders used in doors and formed by an internal stator and an external stator connected at the bottom by a central zone, and the set contains blocking systems which are, respectively, the internal rotor and the external rotor acting together with a mobile clutch in the rotary cam.

[0002] This device provides a security against an act of vandalism consisting in gripping the cylinder by its front section with a pliers type tool and applying force from right to left, and once the cylinder is broken along the central zone, the burglar acts on the rotary cam in order to activate the door opening mechanism and penetrate inside the house.

[0003] The present invention relates to a device for providing security against attempts to force the cylinder of a lock using a set of plugs in order to set up the opening key.

[0004] Generally, the methods of violation of lock cylinders attempt to override in a certain manner, destructive or not, the opening key established by means of the plugs, in order to be able to act on the rotary cam which activates the locking mechanism to its opening.

[0005] The present invention is centred on two typical vulnerability modes which have similar operation and have not yet been adequately resolved.

[0006] One of these modes consists in drilling, by applying a drill-bit from the front part of the cylinder lengthwise along the channel for the key, in order to destroy the plugs, which form the opening combination, taking advantage of the fact that the material of the drill-bit is much harder than the material of the cylinder and the plugs.

[0007] The other mode consists in screwing in a high-resistance screw into the channel for the key, and once it is anchored in it, pulling it until succeeding in pulling it out together with the rotor of the cylinder.

PRIOR ART

[0008] There are known lock cylinders, which comprise, as a security means, an internal protector, which is located in the front part of the weak central zone with the rotary cam and the subjection bore, encompassing completely the contour of the cylinder in this zone. With this security element, the professional burglar is prevented from clamping the cylinder or the rotary cam from outside with the help of a pliers-type gripping tool in order to apply a buckling force until it breaks the said central part.

[0009] There are also other devices called "anti-drill" devices for lock cylinders, which use locking bolts with higher hardness in the rotor. These devices are designed to cause a peripheral damage in the blade of the extracting drill-bit and impede the professional burglar from perforating the channel for the key and gripping the rotor of the cylinder, thus preventing its extraction.

[0010] On the other hand, there are lock cylinders which comprise complete mechanisms formed by displaceable elements located in the stator of the cylinder and which, once the professional burglar has succeeded in extracting the rotor of the lock cylinder, block the locking mechanism.

[0011] There are other security mechanisms which are designed for the case when the professional burglar has succeeded in breaking the cylinder in its central zone and subsequently extracting the external half-body of the cylinder. These mechanisms block the clutch of the cylinder thus impeding the opening of the door, but their operation is insufficiently reliable and complex, since the clutch is a part which is usually extracted together with the external half-body of the cylinder by the act of vandalism of the burglar.

[0012] The "New Kitemark Standard" of 18 August 2011 also refers to a series of specifications formulated by following the emergency related to a method of attack centred on the cylinders used in locks. This standard uses tests with human interventions and thus ensures that such tests are very similar to a real attack.

[0013] This standard has been subject to modifications in the direction of toughening the test, because the old standard required dimensions of the opening in the door with oval form with dimensions 40x25 mm, into which the lock is inserted and the attack test is performed. Currently, these dimensions must be of 60x40 mm, because the doors installed in the lodgings are not with excessive strength, for example they are neither reinforced nor armour-plated. This leads to a greater accessibility of the cylinder from the front part of the door, which makes it more vulnerable to vandalistic attacks. In addition, the existing security mechanisms for lock cylinders, which are designed according to the requirements of the old standard, are not sufficiently effective.

[0014] For ensuring the security of the cylinders, The European standard EN 1303 establishes five levels of security based on the compliance with the recommended parameters related to the design and the tests simulating an attack, such as resistance to fire, security against break-ins, number of possible combinations, durability, resistance to corrosion, etc.

[0015] The purpose of this standard is to guarantee a certain level of quality related to a traceability of the results of the tests, which, with the objective to create a comparative base for standardisation, are entrusted to machines with the task of the responsible technician being nothing else than the operation of the machine and ensuring that the conditions established for the test are fulfilled; in other words, tests which can qualify as academic ones.

[0016] On the basis of the results of this type of tests, known solutions have been adopted, which consist in mounting in the rotor locking bolts made of hardened steel, which have a completely cylindrical form.

[0017] However, in reality it happens so that the professional burglar is an expert in the area of the cylinders and can find weak points in them permitting him to attack them successfully; in addition, the retail market constantly offers a wide range of instruments and tools which provide greater effectiveness for his ends; for example, autonomous portable tools, high-resistance widia drill-bits, screwdrivers made of special steels and more diverse and handy traction means.

[0018] Under these circumstances, private certification organisations have appeared that perform tests with participation of a human element, with the tests reproducing conditions that are very similar to those of a real attack by a burglar.

[0019] Although in both kinds of tests it is presumed that the cylinder will be violated, the resulting quality certificates take into account and ensure also a period of time parameter which is different according to the certified level of security and during which the cylinder will resist the attack.

[0020] These private organisations acquire great relevance because the insurance companies provide bonuses when, in addition to the compliance with the requirements of the European standard EN 1303, certificates of such private organisations are submitted.

[0021] As it has already been pointed out above, in reality the adopted protection is based on the use of cylindrical locking bolts with high resistance located in a frontal transversal section of the rotor. This solution is not effective because the cylindrical locking bolt opposes a very small section of hard material in order to disable or impinge the action of an attack with a drill-bit or a screwdriver, so that in the case when the drill-bit suffers a peripheral damage it is not sufficient to stop its destructive effect, and in the case of a screwdriver the thread would not be destroyed completely and could still produce a sufficient grip in order, depending on the case, to support the traction which could succeed in extracting it taking out with it the rotor of the cylinder; including, in the case of a straight frontal penetration, if the separation between the cylindrical locking bolts of the set is not well adjusted, a purely tangential contact or absence of contact could be produced, which would make the work of the burglar very convenient. In the special case of the use of a screwdriver with the said configuration of the cylindrical locking bolts, it is possible for the burglar to attack in oblique form under an angle coinciding with the half of the thread pitch, with the result that the cylindrical locking bolts themselves provide a support for advance in the thread in a way that is similar to the way this is done by a self-tapping screw in strip clamps.

[0022] One way to improve the resistance to this type of attack consists in the positioning of different sets of locking bolts aligned in transversal direction or in oblique form along the rotor in a way to create a series of successive strong points in order to provoke a break in the drill-bit or disablement of the screwdriver. The inconvenience here is that, since the positions occupied by the locking bolts can not be occupied at the same time by the plugs which establish the combination, the number of the possible combinations of the cylinder will be affected, which reduces the security level provided by it; it has to he pointed out that for each combination plug there are from 5 to 7 possible heights available, due to which the combination capacity of the cylinder will be diminished in proportion to each position that has been lost by the combination plugs.

EXPLANATION OF THE INVENTION AND ITS ADVANTAGES

[0023] Under this state of affairs, the present invention proposes a security device for door-related lock cylinders, which consist of an internal stator and an external stator, connected at the bottom by a central zone, and the set contains blocking systems, which are, respectively, the internal rotor and the external rotor acting together with a mobile clutch in the rotary cam, and consists in a security mechanism comprising elements of axial displacement of the rotary cam and radial and axial blocking of the same when the external stator and the external rotor, including the mobile clutch, have been eliminated.

[0024] Thanks to this configuration, it is achieved to incorporate the rearmost device for security or blocking in the most internal part of the cylinder, which is the only part that remains after the external half-body formed by the external rotor and stator has been extracted. This impedes the burglars from having sufficient time for opening the lock, because before to be able to act on this security device they will have to force the protective outer plate, the external rotor, the external stator and including the clutch and its accessories. This increases considerably the time that is necessary for the burglar to open the lock, and this time exceeds the time established by the most rigorous security standards. As a matter of fact, the "New Kitemark Standard", which is considered the most demanding in matters of security, establishes 2.5 minutes as the maximum amount of time available to the burglar for opening the lock before being discovered or before other security devices such as an alarm are activated, which time is less than the time provided by the security device described in the present patent.

[0025] In the same line of thinking, another particularity of the invention is that the security mechanism is formed by a fixing element, which is loaded elastically against a spring located in a pocket of the internal stator or in a pocket of an external security element of the cylinder and serves as an enveloping and protecting shield of the same. In any of these implementations, the security device will act together with an element of axial mentum of the rotary cam and a slot in the form of a ring with existing holes in the rotary cam, with the meeting point of the fixing element coinciding with the slot in the form of a ring of the rotary cam producing the fixation of the same, and when the fixing element confronts one of the holes, this causes blocking of the rotation of the rotary cam. This leads to the automatic and immediate blocking of the rotary cam, the only element that can permit the opening of the lock once the remaining elements of the cylinder have been extracted. This automatic blocking is achieved by the almost immediate actuation of the driving element which, once the external rotor and stator have been extracted, displaces axially the rotary cam until it is left in optimal operating position, so that the fixing element remains aligned with the slot in the form of a ring of the rotary cam, remaining, due to the action of the spring, inserted in the slot in the form of a ring and generating a first axial blocking. Furthermore, when the burglar turns the cam trying to open the lock, he only achieves its stronger blocking, because during the rotation the fixing element meets one of the openings of the slot in the form of a ring of the rotary cam and becomes anchored in it thus generating a double axial and radial blocking. At least two openings must exist in the rotary cam with the purpose that only half a turn of the cam will be necessary to ensure the aforementioned blocking by insertion of the fixing element in the opening. In addition, one blind hole is provided in the internal rotor, which can accommodate the fixing element when one of the openings of the rotary cam and the blind hole meet with each other. In this way, the axial and radial blocking of the cam is reinforced, incrementing it with the penetration of the fixing element into the rotor.

[0026] In an optional implementation, the invention considers that the top section of the fixing element has an axial driving bezel that is capable to slide on the pad of the slot in the form of a ring of the rotary cam, forcing the rotary cam to shift longitudinally once the external rotor and the external stator and the clutch have been extracted, and due to the instability of the support of the pad of the slot in the form of a ring on the axial driving bezel caused by the movement generated by the forcing exercised by the burglar on the rotary cam. In this way, the force of the spring that is loaded against the fixing element in its bottom part is used both for shifting the rotary cam and for inserting it in the slot in the form of a ring of the cam, thus causing the blocking of the same and the impossibility to open the lock.

[0027] In another aspect, the invention considers that the internal flaps of the rotary cam are made of weakened material, which would provoke its rupture if forced by a turning tool, thus preventing the burglar form operating the rotation of the cam because of the absence of flat support surfaces from where to actuate the turning tool, and the cam will remain inoperable for the opening.

[0028] In this new device, a new optional implementation is foreseen, in which the rotary cam consists of two elements; a female bush and a male bush connected to each other by the adjustment of the bulge for fixing the male bush and the corresponding recess made in the female bush, and with the particular feature that, in addition, the male bush contains a weakening slot. In this way, the set of the rotary cam will remain connected and performing its function of opening and closing the lock normally, except in the cases when the cam is attacked by an intruder who attempts its extraction and by using a turning tool applies force that is sufficient for breaking the male bush due to the slot deliberately made in its interior. By means of this slot, the breaking of the male bush is ensured when it is forced, and as a result of the breaking this element of the set of the cam can be extracted by the burglar, which makes absolutely impossible the opening of the lock because the opening element of the cam is the bulge itself which contains the male bush. The female bush of the set of the rotary cam will remain blocked ion the rotation and axially by the insertion of the fixing element both in the slot wit the form of a ring and in the openings of the rotary cam. This invention presents also a security device with anti-drilling protection for lock cylinders, which uses security locking bolts with adequate, increased hardness, designed as locking bolts with a facet, because they have in their periphery at least one flat face with an anti-drilling facet oriented in parallel to the channel of the cylinder for the key; according to the invention, the said flat face with anti-drilling facet has a longitudinal dimension of at least 0.5mm in the direction of the channel for the key; also, according to the invention, the rotor has at least one pair of locking bolts with a facet, which are mounted collaterally in a transversal section of the cylinder in a way that their respective flat faces remain confronted with the channel for keys with a separation not greater than 3.3mm.

[0029] With this device, a high-resistance, wide longitudinal zone is created, where the drill-bit or the screwdriver, no matter whether the attack is perpendicular or tilted with respect to the front section of the cylinder, receives serious damage which cripples their action due to the loss of their aggressive means (blades of the drill-bit or the edges of the thread of the screw) or, including, becoming broken.

[0030] Another very important advantage of the proposed solution is that, although not limited, in general, only one pair of locking bolts located very close to the front part of the cylinder can be sufficient in a way that they can also be compatible with the usual combination plugs of the cylinder; in the limit case, one of the locations of the usual combination plugs of the cylinder can be sacrificed. This means that this solution permits to have a large capacity for combinations, which also incorporates the anti-drilling protection proposed in the invention.

[0031] According to a particular feature of the invention, in the locking bolts with a facet, the flat face with anti-rotation facet has in the limit case at least one radial flap with anti-rotation facet which juts out from a cylindrical core.

[0032] In this respect, another particular feature included in the invention is that the locking bolts with a facet have a transversal polygonal section determining a plurality of flat faces with every one of them capable to be oriented in parallel to the channel for the key. In the limit case, the transversal polygonal section can be rectangular and determine a locking bolt with a facet in the form of a flange. Alternatively, according to the invention, the locking bolts with a facet have a mixed transversal section which has at least one flat face with anti-rotation facet as a slot with a cylindrical or ovoid form.

[0033] Another particular feature of the invention is that, in order to facilitate their assembly, the locking bolts with a facet can have chamfered cylindrical ends with a smaller contour, which are reciprocal to the pockets existing on purpose in the rotor.

[0034] According to the invention, the locking bolts with a facet are obtained by machining in a metal-cutting, stamping or moulding process; they are made of hardened carbon steel or steel with a metal carbides base.

[0035] Another particular feature of the invention is that the locking bolts with a facet are inserted in cylindrical housings made in the rotor with a standard drill-bit. To this purpose, the much greater hardness of the material, generally brass, of the locking bolt with respect to the cylinder is used, so that by insertion under pressure the locking bolt with a facet is located in the housing, with its deformation and with anti-rotation interlocking, by positioning in turn the locking bolt in such a way that the radial flap with the anti-rotation facet of the locking bolt remains oriented along the penetration direction of the forcing screwdriver or drill-bit in order to achieve the maximum opposing effectiveness against this penetrating action.

[0036] Another particular feature of the invention is that the locking bolts with a facet will be always mounted with their axes in parallel to the central plane of the channel for the key and respectively mounted in a vertical or horizontal position depending on whether the channel for the key is vertical, for a sawn key or horizontal for a flat key.

[0037] These and other particular features of the invention will be demonstrated in the following detailed explanation based on the included graphical representation.

DRAWINGS AND REFERENCES

[0038] In order to understand better the nature of the invention, the appended drawings represent only one form of implementation which has the character of a purely illustrative and not limiting example.

[0039] To facilitate the understanding of the appended drawings, the external rotor (4) and the external stator (6) of the cylinder (1) are shown on the right side of the plot layout and, consequently, the internal rotor (3) and the internal stator (5) of the cylinder (1) are shown on the left side.

Figure 1 shows a perspective overview of the internal rotor (3), the internal stator {5} and the central zone (2) of the cylinder (1), so that by means of a section in the said central zone (2) the fixing element (9) and the spring (10) located in the pocket (12) of the internal stator (5) are visualised. Also shown is the mobile clutch (15) outside of the rotary cam (8), as well as a perspective view of the rotary cam (8) in which the slot in the form of a ring (8a) with the openings (8b) can be seen.

Figure 2 shows a perspective view of the internal rotor (3), the internal stator (5) and the central zone (2) of the cylinder (1), in which by means of a section in the central zone (2) it is shown how the rotary cam (8) has turned counterclockwise at a certain angle with respect to Figure 1, until the fixing element (9) has been introduced into a hole of the rotary cam (8) and in the blind hole (11) of the internal rotor (3).

Figure 3 shows a section along the plane represented by the A-A line shown in Figure 4. In this figure, the fixing element (9) loaded elastically by the spring (10) in the pocket (12) of the internal stator (5) can be seen.

Figure 4 shows a perspective view of the cylinder (1) of the lock according to the invention.

Figure 5 represents a frontal view of the cylinder (1) of the lock.

Figure 6 shows a section along the plane represented by the B-B line shown in Figure 5. This figure shows mainly the central zone (2) of the cylinder (1), where the clamping threaded hole (14), the rotary cam (8) and the mobile clutch (15) are located.

Figure 7 shows a section along the plane represented by the B-B line shown in Figure 5, but where the professional burglar has broken the cylinder (1) in its central zone (2), extracting the external rotor (4), the external stator, (6) and the mobile clutch (15).

Figure 8 shows a section along the plane represented by the B-B line shown in Figure 5. This figure shows how the fixing element (9) is located in the slot in the form of a ring (8a) of the rotary cam (8).

Figure 9 shows a frontal view of the lock cylinder (1), where it can be seen how the rotary cam (8) has rotated in counterclockwise direction with respect so figures 5.

Figure 10 shows a section along the plane represented by the D-D line shown in Figure 9. In this figure it is shown how the rotary cam (8) has turned at a certain angle in counterclockwise direction, until the fixing element (9) was introduced into an opening (8b) of the rotary cam (8) and into a blind hole (11) of the internal rotor (3).

Figure 11 shows one implementation possibility for the rotary cam (8), consisting of a female bush (19a) and a male bush (19b), dimensioned in such a form that it is broken along the internal weakening slot zone (19d) of the male bush (19b), when it is acted vandalically with sufficient torque with the intention to open the lock.

Figure 12 shows an optional implementation in which the axial impulse element (10) is a spring located in a pocket (20) of the internal stator (5).

Figure 13 reflects an optional implementation, in which the upper part of the fixing element (9) is an axial driving bezel (9a) which can move on the pad (23) of the slot in the form of a ring (8c) of the rotary cam (8).

Figure 14 shows an optional solution, in which the fixing element (9) is loaded elastically against a spring (10) located in a pocket (22) of an external security element (21) of the cylinder (1), acting as an internal shield.

Figure 15 shows a horizontal section of a cylinder (1), whose perspective view is illustrated in the attached detail in the upper part of Figure 15. This horizontal section of Figure 15 shows the internal structure of our cylinder, showing, in particular, a pair of locking bolts with a facet (31), which is located ion the rotor (34) and is designed according to the invention. To the right of Figure 15, an enlarged detail of the locking bolt section is incorporated in order to facilitate the numerical identification of its details, and it is accompanied by the possible most prominent variations of the facets according to the invention.

Figures 16A to 16F illustrate a larger array of implementations of the locking bolts with a facet (31) according to the invention.

Figure 17 shows the position the locking bolts would take in the case of a flat key, i.e. with a channel for a flat and horizontal key.

Figure 18 is the cross section portion of the rotor (4) of Figure 16 illustrating the action of the pair of locking bolts with a facet (31) over an extracting screwdriver (34) attacking the rotor (4) from the front along its longitudinal axis.

Figure 19 is a representation similar to Figure 18, which illustrates the action on the extracting screw (34) in Figure 18 on the part of the known cylindrical locking bolts (36).

Figures 20 and 21 are similar to figures 18 and 19, but they illustrate the oblique attack of the extracting screw (34).

Figure 22 illustrates the action of a pair of locking bolts with a facet (31), positioned as shown in figures 15, 18 and 20 with respect to a drill-bit (35) attacking the front section.

Figure 23 is a representation similar to Figure 8, which illustrates the action on the drill-bit (35) in Figure 22 on the part of the known cylindrical locking bolts (36).

Figure 24 is like Figure 18, but referring to the drill-bit (35) of Figure 22.

Figures 25, 26 and 27, respectively, are like figures 22, 23 and 24, but referring to the oblique attack of a drill-bit (35).

Figure 28 shows a locking bolt with a facet (31) as in Figure 15, which is provided with chamfered cylindrical tips (31c) as this is shown in a large size in the enlarged detail in this Figure 28.

Figure 29 is a figure similar to Figure 24, which however shows a rotor (4) equipped at its ends with pairs of locking bolts with a facet (31) according to Figure 15, and illustrates their action with respect to a drill-bit (35), as shown in Figure 24.

Figures 30 and 31 illustrate the capacity of a locking bolt with a facet (31), for example, as in Figure 15, to be put under pressure in a pocket (32d) of the rotor (4).

[0040] These figures contain the following cross-reference designations:

1. Cylinder.

2. Central zone of the cylinder (1).

3. Internal rotor.

4. External rotor

5. Internal stator.

6. External stator.

7. Channel for the key

8. Rotary cam.

8a. Slot in the form of a ring in the rotary cam.

8b. Opening in the rotary cam.

8c. Internal flaps of the rotary cam

9. Fixing element.

9a. Axial impulse bezel

10 Spring.

11. Blind hole in the internal rotor.

12. Pocket.

13. Axial impulse element

14. Clamping threaded hole.

15. Mobile clutch.

16. Combination plugs

17. Counter plugs

18. Springs for the counter plugs.

19. Rotary cam set.

19a. Female bush.

19b. Male bush.

19c. Keying.

19d. Internal weakening slot.

20. Pocket of the internal stator

21. External security element.

22. Pocket in the external security element.

23. Pad.

31. Locking bolt with a facet

31a. Flat face with anti-rotation facet of the locking bolt (31)

31b. Radial flap with anti-rotation facet of the locking bolt (31)

31c. Chamfered cylindrical tip of the locking bolt with a facet (31)

31d. Transversal dimension of the flat face with anti-rotation facet (1a)

31e. Separation between the confronted flat faces (31a)

32d. Pocket in the rotor (4) for a locking bolt with a facet (31)

34. Attacking extracting screw

35. Attacking drill-bit

36. Cylindrical locking bolts

d. Residual diameter of the drill-pit (35) across a pair of locking bolts with a facet (31)

D. Residual diameter of the drill-pit (35) across a pair of conventional cylindrical locking bolts (36)

PRESENTATION OF THE IMPLEMENTATION FORMS

[0041] On the basis of the abovementioned drawings and reference designations, a preferred form of implementation of the object of the invention is illustrated in the attached figures, namely a security device for door lock cylinders (1) consisting of internal stator (5) and external stator (6), connected at the bottom by a central zone (2), and the set accommodates blocking systems, which are the respective internal rotor (3) and external rotor (4) acting as a mobile clutch (15) in the rotary cam (8).

[0042] Figure 1 illustrates the object of the invention, which has a security mechanism comprising elements of axial displacement of the rotary cam (8) and radial and axial blocking of the same, when the external stator (6) and the external rotor (4) have been eliminated, including the mobile clutch (15). By means of this configuration we achieve that the burglar would need more time in order to violate the lock, in the first place because he will have to access up to the rotary cam (8), eliminating the remaining elements of the cylinder (1) during its breaking through the bottom central part (2), and then because his own action on the rotary cam (8) will block it definitively, since, as can be seen in Figure 2, the security mechanism is formed by a fixing element (9) loaded elastically against a spring (10) located in a pocket (12) of the internal stator (5), and in conjunction with an axial impulse element (13) of the rotary cam (8) and a slot in the form of a ring (8a) with openings (8b) in the rotary cam (8), with the confrontation of the fixing element (9) coinciding with the slot in the form of a ring (8a) of the rotary cam (8) producing fixing of the same, and when there is a confrontation between the fixing element (9) and some of the openings (8b) penetrating and causing the blocking of the rotation of the rotary cam (8).

[0043] The automatic blocking of the rotary cam (8), which is achieved by the quasi simultaneous but sequential actuation of the axial impulse element (13), once the external rotor and stator have been extracted (Figure 7), displaces axially the rotary cam (8) until leaving it in optimal operating position (Figure 8), so that the fixing element (9) remains aligned with the slot in the form of a ring (8a) of the rotary cam (8), remaining, due to the action of the spring (10), inserted in the slot in the form of a ring (8a) and generating a first axial blocking. Furthermore, when the burglar turns the rotary cam (8) trying to open the lock, he only achieves its stronger blocking, because during the rotation the fixing element meets one of the openings (8b) of the slot in the form of a ring (8a) of the rotary cam (8) and becomes anchored in it thus generating a double axial and radial blocking. As it can be seen in Figure 4, the existence of at least two openings (8b) in the rotary cam (8) has been foreseen, with the purpose that after a half turn of the rotary cam (8) the abovementioned blocking is ensured by the penetration of the fixing element (9) in the opening (8b). In addition, one blind hole (11) is provided in the internal rotor (3), which can accommodate the fixing element (9) when one of the openings (8b) of the rotary cam (8) and the blind hole (11) meet with each other. Figures 2 and 9 show this characteristic, which reinforces the axial and radial blocking of the rotary cam (8) by incrementing it with the penetration of the fixing element (9) in the blind hole (11) of the internal rotor (3).

[0044] As it can be seen in figures 3 and 4, in a preferred implementation the axial impulse element (13) is a spring located between the rotary cam (8) and the internal stator (5) of the cylinder (1). Another possible implementation, such as the one presented in Figure 12, is that the axial impulse element (10) is a spring located in a pocket (20) of the internal stator (5), which protects this security element from any possible impact on its installation.

[0045] Another implementation of the invention, which can be seen in Figure 13, is that the upper part of the fixing element (9) is an axial impulse bezel (9a) that can be displaced by the pad (23) of the slot in the form of a ring (8c) of the rotary cam (8), since the angular component corresponding to the angle of the pad (23) of the rotary cam (8) permits it to slide on this pad (23) displacing longitudinally the rotary cam (8) at the same time when it becomes lodged in the slot in the form of a ring (8a) thus generating the blocking of the rotary cam (8).

[0046] As regards another possible location of the fixing element (9), it can be seen in Figure 14 that in an optional implementation of the present invention the fixing element (9) is loaded elastically against a spring (10) located in a pocket (22) of an external security element (21) of the cylinder (1).

[0047] In another aspect, the invention considers that the internal flaps (8c) of the rotary cam are made of weakened material, which would provoke its rupture if forced by a turning tool, thus preventing the burglar form operating the rotation of the rotary cam (8) because of the absence of flat support surfaces from where to actuate the turning tool, and the rotary cam (8) will remain inoperable for the opening.

[0048] On the basis of the drawings, different variants are illustrated of a preferred form of implementation of the object of the invention related to an anti-drilling device for protection of lock cylinders, which, as illustrated by figures 15 and 16A to 16F, has a specific feature of comprising locking bolts with adequate increased hardness designed as locking bolts with a facet (31), because they have in their periphery at least one flat face with an anti-rotation facet (31a) oriented in parallel to the channel for the key (7) of the cylinder (1). According to the invention, the flat face with an anti-rotation facet (31a) has a longitudinal dimension (31d) of at least 0.5 mm. in the direction of the channel for the key (7); and the rotor (4) has at least one pair of locking bolts with a facet (31), which, as shown in Figure 15, are located collaterally in a transversal section of the cylinder (1) in a way that their respective flat faces (31a) remain confronted with respect to the channel for the key (7) with a separation (31e) that is not greater than 3.3mm.

[0049] According to a preferred form of implementation of the locking bolt with a (31) of the invention, the flat face with an anti-rotation facet (31a) in the locking bolt with a facet (31) is at the end of at least one radial flap with an anti-rotation facet (31b), which juts out from a cylindrical core (31c); this configuration is the one shown in Figure 15 and is then used in the remaining drawings. One variant of it is the one shown in Figure 16A, which, instead of a radial flap with an anti-rotation facet (31b), shows two equal ones confronted to each other for greater practical versatility.

[0050] According to the invention, a variant is considered, in which the locking bolts with a facet (31) have a transversal polygonal section determining a plurality of flat faces (31a) with every one of them capable to be oriented in parallel to the channel for the key (7). In this respect, figures 16B to 16E show the respective transversal sections of the forms: triangular, which offers three flat faces (31a), each one of them with a minimum dimension established in the invention; square, with four flat faces (31a), according to the invention; octagonal, with eight flat faces (31a) with the same condition as the preceding ones; and rectangular, which, due to the relationships between the dimensions, results in a design with one locking bolt with a facet (31) in the form of a flange, where the active flat faces (31a) could be the small faces from Figure 16E, always under the conditions of minimal dimensions established in the invention.

[0051] Another implementation form is one in which the locking bolts with a facet (31) have a mixed transversal section which has at least one flat face with anti-rotation facet (31a) as a slot with a cylindrical or ovoid form. The transversal section from Figure 16F corresponds to this variant.

[0052] In order to facilitate their assembly (Figure 28), the locking bolts with a facet (31) can have cylindrical ends (31c) with a smaller contour which are reciprocal to the pockets existing on purpose in the rotor (4); for example, those shown in figures 30 and 31 for the rotor (4), maintaining their operative position due to the anti-rotation effect of the slot.

[0053] Taking advantage of the much greater hardness of the two locking bolts with a facet (31) with respect to the material of the rotor (4) and, thanks to the exercising of a certain pressure, another specific feature of the invention is that (figures 30 and 31) it is provided that the locking bolts with a facet (31) are inserted in cylindrical accommodations (32d) made with a standard drill-bit in the rotor (4) by maintaining their operative socket position.

[0054] According to the invention, the locking bolts with a facet (31) are obtained by machining in a metal-cutting, stamping or moulding process; they are made of hardened carbon steel or steel with a metal carbides base.

[0055] Also according to the invention, the locking bolts with a facet (31) will be always mounted with their axes in parallel to the central plane of the channel for the key (7) and respectively mounted in a vertical or horizontal position depending on whether the channel for the key (7) is vertical, for a sawn key or horizontal for a flat key.

[0056] With respect to the functionality, the effectiveness of the invention is illustrated clearly in figures 18 to 27 and 29, where, for the sake of representative uniformity, all of them use the configuration of a locking bolt with a facet (31) shown in the final enlarged detail of Figure 15, with the purpose to have the flat face with anti-rotation facet (31a) at the front of the radial flap with anti-rotation (31b); figures 18 to 21 refer to attacks with an extracting screw (34); figures 22 to 27 and 29 refer to attacks with a drill-bit (35).

[0057] In the case of a frontal attack with extracting screw (34), it is observed (Figure 18) that the filleted thread becomes "eaten" due to the great extension of the flat face with anti-rotation facet (31a) in the direction of penetration of the extracting screw (34) and to the fact of opposing at the beginning of a live edge to this penetration; on the other hand, with the traditional cylindrical locking bolts (36) (Figure 19) what impacts the thread of the extracting screw is a peripheral curved section which damages the thread without a guarantee for its total destruction, so that the portion of the thread that has not been destructed can provide sufficient support, so that when the extracting screw (34) is pulled out, it can pull the rotor (4) out of the stator (6). When the attack of the extracting screw (34) is oblique, the locking bolts with a facet (31) produce a result (Figure 20), which is equivalent to the preceding case, with a total destruction of the thread; on the other hand, when traditional cylindrical locking bolts (36) are used (Figure 21), the result is more favourable for the burglar who, in the case of a frontal attack, can give a certain tilt of the extracting screw (34), which coincides with the average thread profile, and the cylindrical locking bolts (36), instead of hindering, improve the thread in the same way as a self-tapping screw threads in its clamp.

[0058] In the case of a frontal attack by means of a drill-bit (35), the comparison of figures 22 and 23 shows the much greater destructive action on the drill-bit (35) on the part (Figure 22) of the locking bolts with a facet (31), compared to the cylindrical locking bolts (36) shown in Figure 23; Figure 24 illustrates the effect of Figure 22 showing the drill-bit (35) penetrating in the rotor (4); an extrapolation of this Figure 24 is the presentation in Figure 29, where the rotor (4) is provided with a second pair of locking bolts with a facet (31) in its rear end. When the attack of the drill-bit (35) is oblique, the comparison of figures 25 and 26 shows that the action of the locking bolts with a facet (31) is "eating" the body of the drill-bit (35) until it reduces it to a diameter (d), which can produce the effective turn of the drill-bit (35), as shown in Figure 27; on the other hand, with the cylindrical locking bolts (36) (Figure 26), the body of the drill-bit (35) conserves a larger diameter (D) that is sufficient for it to continue its destructive action.

Claims

1. Security device for door-related lock cylinders (1), which consist of an internal stator (5) and an external stator (6), connected at the bottom by a central zone (2), and the set contains blocking systems which are, respectively, the internal rotor (3) and the external rotor (4) acting together with a mobile clutch (15) in the rotary cam (8), characterised in that it has a security mechanism comprising elements of axial displacement of the rotary cam (8) and radial and axial blocking of the same when the external stator (6) and the external rotor (4), including the mobile clutch (15), have been eliminated.

2. Security device for door-related lock cylinders (1), according to claim 1, characterised in that the security mechanism is formed by a fixing element (9) loaded elastically against a spring (10) located in a pocket (12) of the internal stator (5), and in conjunction with an axial impulse element (13) of the rotary cam (8) and a slot in the form of a ring (8a) with openings (8b) in the rotary cam (8) with the confrontation of the fixing element (9) coinciding with the slot in the form of a ring (8a) of the rotary cam (8) producing fixing of the same, and when there is a confrontation between the fixing element (9) and some of the openings (8b) penetrating and causing the blocking of the rotation of the rotary cam (8).

3. Security device for door-related lock cylinders, according to claims 1 and 2, characterised in that in a preferred implementation the axial impulse element (13) is a spring located between the rotary cam (8) and the internal stator (5) of the cylinder (1).

4. Security device for door-related lock cylinders, according to the preceding claims, characterised in that one blind hole (11) is provided in the internal (3), which can accommodate the fixing element (9) when one of the openings (8b) of the rotary cam (8) and the blind hole (11) meet with each other.

5. Security device for door-related lock cylinders, according to claims 1 and 2, characterised in that in one optional implementation the internal flaps (8c) of the rotary cam (8) are made of a weakened material.

6. Security device for door-related lock cylinders, according to claims 1 and 2, characterised in that in one optional implementation the rotary cam (8) is constituted by a set of the rotary cam (19) consisting of a female bush (19a) and a male bush (19b) whose fixation bulge (19e) has an adjustment with respect to the keying (19c) of the female bush (19a), and with the male bush (19b) incorporating an internal weakened slot (19d).

7. Security device for door-related lock cylinders, according to claims 1 and 2, characterised in that in a preferred implementation the axial impulse element (10) is a spring located between the pocket (20) and the internal stator (5).

8. Security device for door-related lock cylinders, according to claims 1 and 2, characterised in that in a preferred implementation the upper part of the fixing element (9) is an axial driving bezel (9a) which can move on the pad (23) of the slot in the form of a ring (8c) of the rotary cam (8).

9. Security device for door-related lock cylinders, according to claims 1 and 2, characterised in that in one optional implementation the internal flaps (8c) of the rotary cam (8) are made of a weakened material.

10. Security device for door-related lock cylinders, according to claims 1 and 2, characterised in that in one optional implementation the fixing element (9) is loaded elastically against a spring (10) located in a pocket (22) of an external security clement (21) of the cylinder (1).

11. Security device for lock cylinders which comprise security locking bolts for anti-drilling protection with enhanced hardness, characterised in that the security locking bolts are locking bolts with a facet (31), that in their periphery they have at least one prominent flat face with anti-rotation facet (31a) oriented in parallel and escorting the channel for the key (7) of the cylinder (1), and with the entire transversal dimension of the said flat face with anti-rotation facet (31a) oriented towards the possible attacking screw (34) or drill-bit (35).

12. Security device for lock cylinders for anti-drilling protection, according to claim 11, characterised in that the said flat face with anti-rotation facet (31a) has a longitudinal dimension (31d) of at least 0.5mm in the direction of the channel for the key (7).

13. Security device for lock cylinders for anti-drilling protection, according to claim 11 or 12, characterised in that in the locking bolts with a facet (31) the flat face with anti-rotation facet (31a) is at the end of at least one radial flap with anti-rotation facet (31b), which juts out from a cylindrical core (31c).

14. Security device for lock cylinders for anti-drilling protection, according to claim 11 or 12, characterised in that the locking bolts with a facet (31) have a transversal polygonal section determining a plurality of flat faces (31a) with every one of them capable to be oriented in parallel to the channel for the key (7).

15. Security device for lock cylinders for anti-drilling protection, according to claim 11 or 12, characterised in that the locking bolts with a facet (31) have a mixed transversal section which has at least one flat face with anti-rotation facet (31a) as a slot with a cylindrical or ovoid form.

16. Security device for lock cylinders for anti-drilling protection, according to claim 14, characterised in that the mixed transversal polygonal section can be rectangular and determine a locking bolt with a facet (31) in the form of a flange.

17. Security device for lock cylinders for anti-drilling protection, according to claims 11 to 16, characterised in that the rotor (4) has at least one pair of locking bolts with a facet (31) mounted collaterally in a transversal section of the cylinder (1) in a way that their respective flat faces (31a) remain confronted with the channel for keys (7) with a separation (31e) not greater than 3.3.

18. Security device for lock cylinders for anti-drilling protection, according to claims 11 to 17, characterised in that the locking bolts with a facet (31) can have cylindrical ends (31c) with a smaller contour, which are reciprocal to the pockets existing on purpose in the rotor (4).

19. Security device for lock cylinders for anti-drilling protection, according to claims 11 to 18, characterised in that the locking bolts with a facet (31) are obtained by machining in a metal-cutting, stamping or moulding process.

20. Security device for lock cylinders for anti-drilling protection, according to claims 11 to 19, characterised in that the locking bolts with a facet (31) are made of hardened carbon steel or steel with a metal carbides base.

21. Security device for lock cylinders for anti-drilling protection, according to claims 11 to 20, characterised in that the locking bolts with a facet (31) are inserted in cylindrical housings made in the rotor (4) with a standard drill-bit.

22. Security device for lock cylinders for anti-drilling protection, according to claims 11 to 21, characterised in that the locking with a facet (31) will be always mounted with their axes in parallel to the central plane of the channel for the key (7) and respectively mounted in a vertical or horizontal position depending on whether the channel for the key (7) is vertical, for a sawn key or horizontal for a flat key.

Drawing