FR2821106A1 - SECURITY LOCK WITH INCREASED SELECTIVITY AND CORRESPONDING KEY - Google Patents

Abstract

The key blank has a manually operable rod (51) oriented along a longitudinal axis (X), and a key-bit (52) carried by an end (510) of the rod to activate a lock. The key-bit has a reduced section (50), in a plane (Pt) transversal to the longitudinal axis, partially made by a hollow groove (53). The reduced section is asymmetric with respect to all planes parallel to the axis (X) and makes the axis (X) as axis of symmetry of rotation.

Description

contained in the tank.

- -

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  The invention relates generally to the field

security locks.

  More specifically, the invention, according to a first of its aspects, relates to a security lock, comprising a substantially cylindrical body, elongated along a longitudinal axis, a barrel having a key opening and mounted in the body to rotate about the longitudinal and translational axis along the longitudinal axis in a direction of insertion of the key, from a rest position towards which it is resiliently biased, at least a first shutter for obscuring the entry of key, mounted movable in the body in a plane transverse to the longitudinal axis, and elastically returned to a rest position by a centripetal elastic force, and an internal groove formed in an internal periphery of the body, the first flight and being selectively moved from its rest position to an authorization position by any suitable key having, along the plane transverse to the longitudinal axis, a thick section ur adapted to the lock and for which the first flap escapes the internal groove, and the first flap being selectively moved from its rest position to a first position offset by any unsuitable key or false key having, according to the plane tranevereal to the longitudinal axis, a section of thickness greater than the thickness adapted to the lock and for which a first external edge element of the first flap falls into the internal groove and prevents translation of the

barrel.

  Security locks of this type have been known for many years, as evidenced for example by patent documents FR - 2,552,146 and FR - 2

552,147.

  Although these locks have so far given the greatest satisfaction, particularly with regard to the level of security they offer, the development of machines - -

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  digital keys reproduction gives rise, at least in the long term, to the need to increase the selectivity of these locks. In this context, the present invention specifically aims, according to a first of its aspects, to

  propose a lock with increased selectivity.

  The lock of the invention, furthermore in accordance with

  the generic definition given in the preamble below

  above, is essentially characterized in that the first flap has a second external edge element by which it is engaged in the internal groove at least when it is placed in a position included in a range of intermediate positions between its position

  rest and its authorization position.

  Preferably, the first flap is engaged in the internal groove by its second external edge element when it occupies its rest position and any intermediate position between its rest position and its authorization position. The first flap is advantageously rotatably mounted on the barrel about a secondary axis parallel to the longitudinal axis and offset relative to it towards a periphery of the barrel, this secondary axis being disposed in an axial plane passing between the first and second external edge elements of the first flap. To do this, the first component comprises for example a pedunculated button forming a pivot, centered on the secondary axis, and required in an additional housing.

of the barrel.

  It is possible to provide that the first flap has a heel carrying the first external edge element and a point carrying the second external edge element, that the heel has an internal edge disposed on the key entry and selectively displaced by a section. of the key, depending on the thickness, shape, and / or position of this section, and that - -

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  the secondary axis is disposed in the tip of the first flap. The internal edge of the first flap can be chamfered to facilitate the insertion and removal of the key. In a preferred embodiment, the lock of the invention comprises a second flap identical to the first flap, the first and second flaps adopting respective rest positions resulting from one of

  the other by rotation around the longitudinal axis.

  This lock can also include a pre-stressed spring bracelet in extension and engaged in respective external peripheral grooves of the first and second flaps to exert the centripetal elastic force.

on these two strands.

  To perfect the kinematics of these components, the heel of each component and the tip of the other component can interpenetrate when these components are in their

rest position.

  The invention also relates to a key or a key blank which not only can be used for actuating a lock according to the invention, as defined above, but which has a structure which makes it intrinsically difficult to reproduce by

any unauthorized person.

  Such a key or key blank, which comprises, in a manner known per se, a rod man_uvrable by hand and oriented along a longitudinal axis, and a bit carried by one end of the rod to actuate the lock, the bit having, in a plane transvereal to the longitudinal axis, a reduced section at least partially drawn by a groove which is dug there, is essentially characterized in that the reduced section is asymmetrical with respect to any plane

parallel to the longitudinal axis.

  For example, the reduced section admits the axis

  longitudinal as axis of rotation symmetry.

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  This reduced section can in particular extend along a medium outline and present, perpendicular to this medium course, a thickness

substantially constant.

  The average route advantageously has a sinuous shape, indifferently made up of curves or

zigzags.

  The key or key blank according to the invention is to

  preferably carried out at least in part by stamping.

  Other features and benefits of

  the invention will become clear from the description which

  is made below, by way of indication and in no way limitative, with reference to the accompanying drawings, in which: - Figure 1 is a partial exploded view in perepective of a lock according to the invention; Figure 2 is a front view of a key blank according to the invention; - Figure 3 is a partial sectional view of the blank illustrated in Figure 2, observoe according to the incidence defined by arrows III-III of Figure 2; - Figure 4 is a partial sectional view of the blank illustrated in Figure 2, observed according to the incidence defined by the arrows IV-IV of Figure 2; - Figure 5 is a perspective view of a key according to the invention, made from the blank illustrated in Figure 2; - Figure 6 is a cross-sectional view of a lock according to the invention, the cut being carried out in the plane of the shutter shutters of the key slot and the lock being observed in the state it adopts by receiving a key or a key blank adapted to this lock; - Figure 7 is an axial sectional view of a lock illustrated in Figure 6 and observed along

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  s the incidence defined by tasks VII-VII of this figure 6; - Figure 8 is a cross-sectional view of a lock according to the invention, the cut tanL rdalise in the plane of the shutters of oboluraLion of key eLLde the lock {LanL observed in the ALaL it adopts during the introduction of a key or a key cover suitable for this lock, this type of lock is the same as that which it adapts by receiving a key or a key blank of thickness greater than that which is ADAPT THIS LOCK; - Figure 9 is an axial sectional view of the lock illusLre Figure 8 eL observes following the incidence defined by the arrows IX-IX of THIS FIGURE 8; - Figure 10 is a transverse sectional view of a lock in accordance with the invention, the ALANL section realizes in the plane of the locking flaps of the key and the lock {LanL observes in the 6L which it fits in her rest ALaL, this LAL ALanL the same as that which she adopts by receiving a key or a key key thicker than that which is suitable for this lock; - Figure 11 is an axial sectional view of 2s lock illustrde Figure 10 eL observes following the incidence defined by the arrows XI-XI of THIS figure; - Figure 12 eL a perGpecLive view of a voleL of obLuraLion of the key lock, used in a lock conforms to the invention; - Figure 13 is a side view of the voluIle illuLrd in figure 12, this flAl ALanL observAl follows the incidence defined by arrow XIII of FIG. 12; - Figure 14 is a front view of the illusLrd voleL Figure 12, this ALANL voleL observanL the incidence defined by the arrows XIV-XIV of Figure 13;

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  - Figure 15 is a side view of the shutter illustrated in Figure 12, this shutter being observed according to the incidence defined by the arrow XV of Figure 12; and - Figure 16 is a front view of the flap illustrated in Figure 12, this flap being observed according to the incidence defined by the arrows XVI-XVI of Figure 15. The security lock of the invention essentially comprises, fac, we know, a cylindrical body 1,

  a barrel 2, and one or more components such as 3 and 4.

  The body 1, of generally cylindrical shape, is elongated along a longitudinal axis X and closed by a face 10 in which is pierced an orifice 12 allowing the introduction of a key, such as the key 5 illustrated

in Figure 5.

  Furthermore, this body 1 carries, in its periphery

internal 100, an internal groove 11.

  The barrel 2 is mounted in translation in the body 1 along the axis X, in a direction D of introduction of the key 5, and against an elastic force which recalls it in a rest position for which it is supported on the face 71 of a lining 7, this lining pressing itself against the face 10 of the

body 1.

  The barrel 2, which has a key entry 20, is also mounted for rotation in the body 1 around the longitudinal axis X. Each of the flaps such as 3 and 4 makes it possible to conceal the key entry 20, is mounted movable in the body 1 in a plane Pt transverse to the longitudinal axis X, and is elastically returned to a rest position by a centripetal elastic force, that is to say a force which urges each flap towards the longitudinal axis X. The lining 7, disposed between the barrel 2 and the face 10 of the body 1, is itself pierced with a passage 70

for key 5.

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  Each of the flaps 3 and 4 can, in known manner, adopt at least three positions, namely the previously mentioned rest position, in which this flap at least partially closes the keyway 20, an authorization position in which this flap escapes from the internal groove 11 and authorizes the translation of the barrel 2 relative to the body 1, and a first offset position, in which this flap falls into the internal groove 11 and prohibits the translation of the barrel 2 relative to the

body 1.

  More specifically, each flap such as 3 and 4 is moved from its rest position to its authorization position by any key adapted to the lock, that is to say by a key having, according to the Pt plan transvereal to the longitudinal axis X (FIG. 2), a section 50 of maximum thickness E suitable for the

lock considered (figure 4).

  Each flap such as 3 and 4 is moved from its rest position to its first position offset by any geometry key unsuitable for the lock and any false key, and in particular by a key or key substitute having, according to the plane Pt transverse to the longitudinal axis X, a section 50 of thickness greater than

  thickness E suitable for the lock in question.

  In the latter case (Figures 8 and 9), each flap such as 3 and 4 falls into the internal groove 11 by a first external edge element, such as 31 and 41, of this flap, and prohibits translation of the barrel 2 by

relation to the body 1.

  According to the invention (Figures 10 and 11), at least one of the flaps, and preferably each flap such as 3 and 4, has a second outer edge element, such as 32 and 42, by which it is engaged in the internal groove 11 at least when it is placed in a position included in a range of intermediate positions between its position

  rest and its authorization position.

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  Preferably, each flap 3, 4 is engaged in the internal groove 11 by its second external edge element 32, 42 when it occupies its rest position (FIGS. 10 and 11) and any intermediate position between its rest position and its authorization position. For example (Figures 1, 6, 8, 10), each flap 3, 4 is rotatably mounted on the barrel 2 around a secondary axis XX parallel to the longitudinal axis X of the body 1. Each secondary axis XX is offset relative to the longitudinal axis X of the body 1 towards the periphery 200 of the barrel 2, and is arranged in an axial plane Pa (FIG. 6) which passes between the first and second external edge elements, such as 31, 32 and 41 , 42, of each flap 3 and 4. To do this, each flap 3, 4 comprises for example a peduncle button, such as 33, 43, forming a pivot, centered on the corresponding secondary axis XX, and required in an additional housing correspondent 23 of

barrel 2.

  As shown in particular in FIGS. 6, 8, and, each flap such as 3 and 4, has a heel such as 34 and 44, and a point such as 35 and 45, the secondary axis XX of each flap 3 and 4 being arranged in

the tip 35, 45 of this component.

  The heel 34, 44 of each flap 3, 4 carries the first external edge element 31, 41 of this flap, while the toe 35, 45 of this same flap carries the

  second corresponding outer edge element 32, 42.

  Each heel 34, 44 also has an internal edge, such as 340 and 440, which is disposed on the key entry 20 and which is moved by the reduced section 50 of the key 5, depending on the thickness, the form

  and / or the position of this section 50.

  As shown in particular in FIG. 7, the internal edge 340, 440 of each flap 3, 4 is advantageously

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  chamfered to facilitate insertion and removal of

the key 5.

  The shutter flaps 3 and 4 are preferably two in number and adopt respective rest positions which are deduced from each other by a rotation of 180 degrees around the longitudinal axis X. The centripetal force which resiliently biases the flaps 3 and 4 towards their rest position is for example exerted by a spring strap 6 (Figures 1 and 7 in particular), pre-stressed in extension, and engaged in respective external peripheral grooves 36 and 46 of these

parts 3 and 4.

  Each flap 3, 4 preferably has (FIGS. 1, 11 and 15) a protrusion such as 341 and 441 formed on its heel 34, 44, and a counterbore such as 351 and 451 formed in its point, so that, in the rest position of these flaps, the heel 34 and 44 of each flap and the tip 45 and 35 of the other flap interpenetrate, by penetration of one of the growths in that of the two

the adjacent laminations.

  A key 5 (FIG. 5) or a key blank 500 (FIGS. 2 and 3) usable for actuating a lock as previously described comprises, in known manner, a rod 51 which can be operated by hand and oriented, in operation , along the longitudinal axis X of the lock, and a bit 52 carried by one end 510 of

  the rod 51 for actuating the lock.

  In a manner also known, the bit 52 has (FIG. 2), in the plane Pt transverse to the longitudinal axis X, a reduced section 50 at least partially drawn out by a groove 53 which is dug there. According to the invention, the reduced section 50 is asymmetrical with respect to any plane parallel to the longitudinal axis X. For example, the reduced section 50 admits the longitudinal axis X as the axis of rotational symmetry, and is

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  in this case invariant by rotation of 180 degrees around the X axis. As shown in FIG. 4, the reduced section 50 can extend along an average path M and can also, without limitation, have , perpendicular to this mean path M, a thickness E substantially constant, regardless of the width

  global L presented in this section 50.

  The average path M can develop along a rounded curve or in zigzags, but preferably has a sinuous shape in all cases. The key or key blank thus defined is advantageously produced by stamping, at least in

part.

  Under these conditions, if the thickness of the section of the key used to cause the movement of the flaps 3 and 4 of the lock, or failing this the thickness of the picking tool, are oversized with respect to the thickness E (Figure 4) that presents the key adapted to the lock, then the first edge elements 31 and 41 of the flaps 3 and 4 fall, as is also the case for the lock described in patent document FR - 2,552,147 , in the internal groove 11 and prohibit the tranelation of the barrel 2 relative to the body 1 of the

  lock, therefore the actuation thereof.

  And if the thickness of the section 50 of the key used to cause the displacement of the flaps 3 and 4, or failing this the thickness of the picking tool, are undersized with respect to the thickness E that the key adapted to the lock, then these are, in accordance with the invention, the second edge elements 32 and 42 of the flaps 3 and 4 which fall into the internal groove 11 and which prevent the translation of the barrel 2 relative to the body 1 of the lock, so

actuation thereof.

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  But the selectivity of the lock of the invention is not only increased by the establishment of a lower thickness limit in addition to the upper limit: it is also increased by a form effect, as allows figure it out figure 4, suppose to represent the reduced section 50 of a key or a

  blank adapted to the lock considered.

  Indeed, if the reduced section of another key of another blank, although having the thickness E adapted to the lock, has an unsuitable shape, the stroke made by the flaps 3 and 4 from their position of rest under the effect of the introduction of this other key or blank will be oversized by contact with the flaps in the zones 501 if the mean path M of the section of this other key or blank is less curved than that of FIG. 4, and will be oversized by contact with the flaps in zones 502 if the average path M of the section of this other key or

  blank is more curved than that of figure 4.

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Claims (14)

  1. Safety lock, comprising an essentially cylindrical body (1), elongated along a longitudinal axis (X), a barrel (2) having a key entry (20) and mounted in the body (1) rotating about the longitudinal axis (X) and translation along the longitudinal axis (X) in a direction (D) of introduction of the key (5), from a rest position towards which it is elastically stressed, at least a first concealment flap (3) of the key entry (20), mounted movably in the body (1) in a plane (Pt) transverse to the longitudinal axis (X), and 1 5 el ast ically returned to a rest position by a centripetal elastic force, and an internal groove (11) formed in an internal periphery (100) of the body (1), the first flap (3) being selectively displaced from its position rest to an authorization position by any suitable key having, along the plane (Pt) transverse to the longitudinal axis (X), a secti on (50) of thickness (E) adapted to the lock and for which the first flap (3) escapes the internal groove (11), and the first flap (3) being selectively displaced from its rest position towards a first position offset by any unsuitable key or dummy key having, along the plane (Pt) transverse to the longitudinal axis (X), a section (50) of thickness greater than the thickness (E) adapted to the lock and for which a first external edge element (31) of the first flap (3) falls into the internal groove (11) and prohibits a tranelation of the barrel (2), characterized in that the first flap (3) has a second external edge element (32) by which it is engaged in the internal groove (11) at least when it is placed in a position included in a range of intermediate positions between its position   rest and its authorization position. l 28211 06   2. Safety lock according to claim 1, characterized in that the first flap (3) is engaged in the internal groove (11) by its second external edge element (32) when it occupies its rest position and any intermediate position between his rest position and its authorization position.   3. Safety lock according to any one of   previous claims, characterized in that the   first flap (3) is rotatably mounted on the barrel (2) about a secondary axis (xX) parallel to the longitudinal axis (X) and offset relative to it towards a periphery (200) of the barrel (2), this secondary axis (XX) being disposed in an axial plane (Pa) passing between the first and second external edge elements (31, 32) of the first part (3).   4. Safety lock according to claim 3, characterized in that the first flap (3) comprises a pedunculated button (33) forming a pivot, centered on the secondary axis (Xx), and rec, u in a complementary housing (23) of the barrel (2).   5. Safety lock according to any one of   previous claims combined with claim 3,   characterized in that the first flap (3) has a heel (34) carrying the first external edge element (31) and a point (35) carrying the second external edge element (32), in that the heel (34 ) has an internal edge (340) disposed on the key entry (20) and selectively moved by a section (50) of the key (5), depending on the thickness, shape and / or position of this section (50), and in that the secondary axis (XX) is disposed in the tip (35) of the first part (3).   6. Safety lock according to claim 5, characterized in that the internal edge (340) of the first flap (3) is chamfered to facilitate the introduction and removing the key (5). 28211 06   7. Safety lock according to any one of   previous claims, characterized in that it   comprises a second flap (4) identical to the first flap (3), the first and second flaps (3, 4) adopting respective rest positions deducing one from   the other by rotation around the longitudinal axis (X).   8. Safety lock according to claim 7, characterized in that it comprises a spring bracelet (6) prestressed in extension and engaged in respective external peripheral grooves (36, 46) of the first and second flaps (3, 4) for exercise elastic force   centripetal on these two flaps (3, 4).   9. Safety lock according to any one of   previous claims combined with claims 5   and 7, characterized in that, for the rest position of the first and second flaps (3, 4), the heel (34, 44) of each flap (3, 4) and the tip (45, 35) of the other flap (4, 3) interpenetrate.   10. Key or key blank, usable for actuating a lock according to any one of the   previous claims, this key (5) or this   blank (500) comprising a rod (51) operable by hand and oriented along a longitudinal axis (X), and a bit (52) carried by one end (510) of the rod (51) for actuating the lock, the bit (52) having, in a plane (Pt) transverse to the longitudinal axis (X), a reduced section (50) at least partially drawn by a groove (53) which is hollowed out there, characterized in that the reduced section ( 50) is asymmetrical with respect to any plane parallel to the longitudinal axis (X).   11. Key or key blank according to claim 10, characterized in that the reduced section (50) admits the longitudinal axis (X) as the axis of rotation symmetry.   12. Key or key outline according to one   any of claims 10 to 11, characterized in that 28211 06   1S that the reduced section (50) '6Lend along a medium paroeurs (M) and pee, perpendicularly this course   medium (M), a thickness (a) appreciably consLanLe.   13. clef on abauche de clef follanL any one of the claims 1Q 11 combines the claim 12, characL4rise in this way the course   medium (M) presence a curvy shape.   14. Key on Key abauche following one of the long claims 10 13, characteristic of this