FR2635352A1 - SECURITY CYLINDER FOR LOCK AND CORRESPONDING KEY - Google Patents

Abstract

This safety cylinder is of the type comprising at least one rotor (12) mounted rotatably in a stator (11) and possessing parallel to its axis a conduit (13) suitable for the insertion of a key (15). According to the invention, for interaction with a key (15), of which the end of the active part forms as a whole an oscillating end piece (30B), the conduit (13) of the rotor (12) possesses, at a distance from its entrance (16A), a widened portion (42) capable of allowing a tilting of the oscillating end piece (30B) of the key (15), with at least one piston (44) entering this widened portion (42) and governed by the entire combination to be adhered to and deflection means (50) capable of directing this oscillating end piece (30B) onto this piston (44). The invention is used for locks.

Description

263,535?

  The present invention relates generally to locks, and more particularly relates to the safety member, commonly called a cylinder, block or barrel, suitable for

the operation of their mechanism.

  As is known, whether it is a profiled cylinder or whether it is a cylinder, a lock safety cylinder comprises, generally rotatably mounted in a stator, at least one rotor having, parallel to its axis, a duct suitable for introducing a key, with, in said rotor, at least one piston mounted movable transversely with respect to said duct, so as to be able to project therein and thus to be able to cooperate with such a key, and, in correspondence, in said stator, a counter-piston whose interface with the piston is not identical with that between the rotor and the stator

  only when an adequate key is in place in said conduit.

  It can be a simple cylinder, which comprises only one rotor, and which is annexed, at the end of the conduit thereof, a cam forming bit for the mechanism to be controlled, that a cylinder double, which, for the same stator, then formed in practice two identical half-stators arranged following each other, comprises, in the alignment of one another, two identical rotors, one for the actuation of the lock of a first side of the cylinder, the other for its actuation on the opposite side to the previous one. In all cases, it is provided, in practice, in various combinations, a plurality of pistons, and, together, the associated key present, in correspondence, in what, here, for convenience, will be called its active part, whether its bit and / or its stem, an equal number of notches, holes, notches or other combination elements, which, duly established, are suitable for allowing the proper positioning of these pistons

263,535?

  necessary for the rotational release of the rotor with respect to

to the stator.

  Indeed, duly elastically solicited accordingly, the counterpiston associated with these pistons normally oppose this rotation in the absence of such a key, while coming to interfere with the interface between

the rotor and the stator.

  One of the major problems in the realization of locks is the need to limit at best

  the possibility of reproduction of their key.

  Most often, whether it is a flat or rhombic key or it is a key of another nature, such a key is in one piece, and so it is relatively easy to reproduce from a simple

draft.

  It is enough to machine on his plate or on his

  singing notches, holes or notches necessary.

  However, it has been proposed for a long time, in particular by US Pat. No. 1,735,868, to make it easier to reproduce a key by adding to its active part a movable member which can also intervene in the combination of release to respect between the rotor and the stator. For example, and this is the case in this US Pat. No. 1,735,868, this movable member constitutes a kind of lever, which, arranged in a buttonhole of the active part of the key, is pivotally mounted about an axis.

  transverse to the longitudinal axis thereof.

  Alternatively, and this is the case in the French patent No. 84 03944 and published under No. 2,561,294, it constitutes a kind of slider which, disposed in a housing affecting the thickness of the same

  active part of the key, is mounted mobile transversally-

  relative to its longitudinal axis.

  In all cases, it is, to date, only an auxiliary organ intervening at a distance from the end of the active part of the key and requiring for its housing a

recess of it.

  This results in an inevitably relatively expensive realization for both the key and the corresponding safety cylinder. The present invention generally relates to a provision which, while making it difficult to reproduce a key, is advantageously

  likely to achieve a more economical.

  More specifically, it firstly relates to a lock safety cylinder, of the type comprising, rotatably mounted in a stator, at least one rotor having, parallel to its axis, a conduit adapted to the introduction of a key, with, in said rotor, at least one piston mounted movable transversely with respect to said conduit, so as to be able to protrude into it and thus be able to cooperate with such a key, and, in correspondence, in said stator, a counter-piston whose interface with the piston is identical with that between the rotor and the stator only when a suitable key is in place in said conduit, this safety cylinder being generally characterized in that, for cooperation with a key whose end of the active part as a whole a tip mounted oscillating relative to the current portion of this active part, the rotor duct has, at a distance from its inlet outlet, e t in the opposite direction & s, a flare adapted to allow tilting of said oscillating end, with, on the one hand, opening into said flare, at least one piston which is associated a counter-piston, and secondly , deflection means adapted to cause an effective tilting of said oscillating endpiece to said piston for its

action on this one.

  Another subject of the present invention is a key specific to the implementation of such a safety cylinder, this key being generally characterized in that the end of its active part forms a tip which, as a whole , and in practice, within the limits of an angular deflection determined by stop means, is mounted oscillating relative to the current portion of this

active part.

  Thus, the movable member associated with the. active part of the key is, either, a subsidiary organ to be housed in a recess of this active part, but a real portion of

  this active part, in this case its end portion.

  Although its reproduction is difficult since it can not be done from a simple blank, the realization of such a key, and it is the same for the corresponding safety cylinder, is advantageously economical. Indeed, it is no longer necessary to hollow out in anything the active part of this key for housing

  of the mobile organ that it comprises.

  It suffices to articulate one to the other both

  successive portions that constitute it.

  Admittedly, it has already been proposed, to limit its size, to articulate in two portions a key, or even the only active part thereof, the corresponding articulation allowing a more or less accentuated folding of these two portions one with respect to the other

when storing the key.

  But, when this arrangement affects the active part of the key, the two corresponding portions are in alignment with each other during the deciphering of the combination of the release of the rotor relative to the stator, and therefore it is in practice portions of the same nature,

  having combination elements of the same type.

  This is not the case with the key according to the invention. Indeed, in use, during the deciphering of the combination of the release of the rotor relative to the stator, the oscillating end that includes this key is deflected. This advantageously results in a possibility

additional combination.

  In addition, the two portions of which is thus constituted the active part of the key according to the invention may advantageously be of different natures. For example, the oscillating tip forming its end portion may be completely smooth, the notches, holes or notches constituting its combination elements not affecting

  while the current portion, rigid, of its active part.

  In a variant, and according to a development of the invention, this oscillating endpiece may have,

  longitudinally, at least one groove.

  Together, it is then expected, between the inlet opening of the rotor duct and its flare, a perforated screen which at least a portion of the contour is notched correspondingly. As it is easy to understand, this perforated screen then forms a sort of filter with respect to the introduction of the key, only a key having a mouthpiece

  oscillating suitably grooved that can cross it.

  Together, the current portion of the active portion of the key can either be smooth, in which case only its oscillating tip is grooved, or present itself-grooves. In all cases, by the grooves presented by the oscillating tip, and by the perforated screen forming the corresponding filter, it is advantageously still added a

  possibility of additional combination.

  The characteristics and advantages of the invention

  will emerge from the description which follows,

  As an example, with reference to the accompanying schematic drawings in which: Figure 1 is an axial sectional view of a safety cylinder according to the invention; Figures 2, 3 and 4 are partial views in cross section, respectively along the lines II-II, III-III and IV-IV of Figure 1; Figure 5 is a partial perspective view of a key according to the invention; Figure 6 is a larger scale, a partial plan view of this key, along the arrow VI of Figure 5; 7A, 7B are views in axial section which, similar to that of Figure 1, each respectively illustrate two successive phases of implementation of the safety cylinder according to the invention; FIGS. 8, 9 and 10 are partial views in axial section which, taking again partially that of FIG. 1, relate respectively to a variant of FIG.

  realization of the safety cylinder according to the invention; -

  FIG. 11 is a perspective view which, similar to that of FIG. 5, relates to an alternative embodiment

key according to the invention; -

  FIG. 12 is a cross-sectional view which, similar to that of FIG. 3, relates to another variant

  embodiment of the safety cylinder according to the invention.

  As illustrated in these figures, and in a manner known per se, the safety cylinder 10 according to the invention comprises, rotatably mounted in a stator 11, according to a cylindrical interface 27, at least one rotor 12 having, parallel to its axis , a conduit 13 suitable for

the introduction of a key 15.

  The conduit 13 extends axially from an inlet outlet 16A to an outlet outlet 16B to the right of which is disposed, as partially diagrammed, and in broken lines, in Figure 1, a cam 18, forming a bit, which , intended to be actuated by the key 15, is specific to the control of the mechanism to maneuver, itself not shown. In the embodiments shown, only one

rotor 12 is provided.

  But, as indicated above, there may be, for the same stator 11, two rotors 12, each respectively disposed on either side of the cam 18, in the alignment

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  of each other, with, then associated with the cam 18, a

  coach or clutch, not shown.

  Anyway, the rotor 12 is duly wedged

axially vis-à-vis the stator 11.

  For example, and as shown, it has for this purpose, on either side of it, shoulders 20A, B, the first on the side of the inlet 16A of its conduit 13, the second side the outlet outlet 16B thereof. In a manner also known per se, at least one piston 21 is provided in the rotor 12, which, resiliently biased for this purpose, as will appear below, is mounted transversely movable relative to the duct 13, protruding manner, by a head 22, forming a pin, therein, and thus be able to cooperate with a key 15 when such a key 15 is present in this

leads 13.

  In practice, several pistons 21 are thus provided.

  For the sake of simplicity, only two of them have been shown in the figures, one on one side of the duct

  13, the other on the other side of it.

  In correspondence with each of the pistons 21, it provides in the stator 11, a counter-piston 23, which is itself mounted transversely movable relative to the conduit 13 of the rotor 12, and which, under the solicitation of a spring 24 taking bearing on a plug 25 closing the bore in which it is struggling, bears directly on the piston 21

with which he is associated.

  The arrangements are such that the interface 26 between a piston 21 and its counter-piston 23, formed by their respective bearing surfaces, is not identical with that 27 acting between the rotor 12 and the stator 11 when, as when this is the case in Figure 7B, a suitable key 15

is in place in the duct 13.

  When this is so, the rotor 12 can be

controlled in rotation.

  But, in the absence of a key 15, the interface 26 between a piston 21 and its counter-piston 23 is offset radially with respect to the interface 27 between the rotor 12 and the stator 11, the piston 21 is found in the corresponding position by a shoulder 29. In such a case, Figure 1, the various counter pistons 23 implemented interfere more or less with the interface 27 between the rotor 12 and the stator 11, so that any

  Rotation of this rotor 12 is prohibited.

  The corresponding arrangements are well known in themselves, they will not be described in more detail here. In a manner also known per se, the key 15 comprises an active part 30, through which it is adapted to penetrate into the conduit 13 of the rotor 12, for cooperation with the pistons 21, and more specifically with the head 22 of

these, and a ring 31.

  Only the base of the latter has been represented on

the figures.

  The active part 30 of the key 15 may for example

to be flat.

  This is the case in the embodiments shown in FIGS. 1 to 10, in which, moreover, this active portion 30 has a cross-section

  rectangular uniform throughout its length.

  As a variant, FIG. 11, this active part 30 can be rhombic, that is to say present a section

  cross-shaped hexagon largely flattened.

  Whatever the case may be, the duct 13 of the rotor 12 of the cylinder 10 has a section transversely complementary to that of the active part 30 of such

key 15.

  According to the invention, the end of this active part 30 forms a tip 30B, which, as a whole, and in practice, as will appear hereinafter, within the limits of an angular clearance D determined by stop means, is mounted oscillating relative to the

  current portion 30A of this active portion 30.

  For example, and as shown, this oscillating endpiece 30B forms two knuckles 32, and, by these, it frames a central knuckle 33 belonging to the portion

current 30A associated.

  In the embodiment more particularly shown in FIGS. 5 and 6, the central knuckle 33 of the current portion 30A extends in the median zone of a recess 34 provided at the end of this current portion 30A, so that the lips 35 of this recess 34 form, for the oscillating endpiece 30B, the abutment means adapted to limit the angular deflection D. In the embodiment shown in Figure 11, the central knuckle 33 of the current portion 30A of the active part 30 protrudes on the end edge thereof, and the stop means associated with the oscillating end piece 30B result from the fact that, unlike the previous arrangement, the knuckles 32 of the oscillating end 30B have an enveloping shape relative to the associated portion 30A associated, thereby forming by themselves abutment heels 35 'on either side of the

corresponding part of it.

  Nevertheless, in either case, the tilting axis 36 of the oscillating tip 30B extends transversely, in the direction of greater elongation of the cross section of the active portion 30. Furthermore, in either case, and as shown schematically in dashed lines in FIG. 6, the angular clearance D of this oscillating end piece 30B is

well below 45.

  For example, it is of the order of AO '.

  In the embodiment shown in Figures 5 and 6, it is associated with the oscillating end 30B, resilient return means constantly urging towards an average position for which it is

  aligned with the associated current portion 30A.

  For example, these elastic return means comprise, for each knuckle 32, a leaf spring 37 established between such knuckle 32 and the current portion 30A. But, especially in view of the limited angular movement of the oscillating endpiece 30B,

  this provision is not mandatory.

  Anyway, the active part 30 of the key 15 according to the invention is thus formed successively of two distinct portions, namely a current portion 30A, which, in practice, is rigidly connected to the associated ring 31 , and an oscillating endpiece 30B, linked by a tilting axis 36

  at the previous portion 30A.

  In the embodiments shown, only the current portion 30A of such an active portion 30 has the combination elements adapted to cooperate with the

  pistons 21 of the rotor 12 of the cylinder 10.

  This is, in this case, blind holes 39 profiled

  in the image of the end of the head 22 of these pistons 21.

  In the illustrated embodiments, these blind holes 39 affect one and / or the other of the songs of this current portion 30A as well as one and / or the other

of his dishes.

  Furthermore, in the embodiments shown, and for reasons that will appear later, the oscillating endpiece 30B has,

  longitudinally, meanwhile, at least one groove 40.

  In practice, several such grooves 40 can thus be provided parallel to each other, and in various profiles, on one and / or other of the plates of this oscillating endpiece 30B, or even on one and /or

the other of his songs.

  In the case of a reversible key, they must obviously be provided simultaneously on one and the other of

  these dishes, and / or on both of these songs.

  Nevertheless, in the embodiments shown, only the oscillating endpiece 30B thus has

such grooves 40.

  But, notwithstanding these grooves 40, the oscillating endpiece 30B has, globally, a cross section identical to

  that of the current portion 30A that it extends.

  In the embodiments shown in Figures 5 and 6, its end edge is generally straight, having, however, its edges cut down by

chamfers.

  As a variant, FIG. 11, this end edge is more or less tapered, being generally rounded both

  longitudinally than transversely.

  For cooperation with a key 15, the end of the active portion 30 thus as a whole a tip B mounted oscillating relative to its current portion 30A, the conduit 13 of the rotor 12 of the cylinder 10 has, according to the invention, distance from its inlet outlet 16A, and in the opposite direction thereof, a flare 42 adapted to allow tilting of this oscillating end piece 30B, with, on the one hand, opening into said flare 42, a piston 44 headed 45, to which, according to arrangements of the type of those described above, is associated a counter-piston 46, and secondly, deflection means adapted to cause effective tilting of said oscillating tip 30B

  towards said piston 44, for its action on it.

  In the embodiments shown in Figures 1 to 9, the flare 42 is defined by at least one inclined portion 43 which is generally oblique with respect to the axis of the duct 13, and against which comes to find a support the endpiece oscillating 30B of the active part 30 of the key 15

when he is deflected.

  For example, and as shown, only such inclined pan 43 can thus be provided to define the flare 42. For the rest, the surfaces defining this flare 42 are then in the extension of the surfaces

  corresponding to the current portion of the duct 13.

  In the embodiment more particularly shown in Figures 1 to 7, and for reasons of convenience of embodiment, the rotor 12 consists of two portions 12A, 12B secured to one another by pins 48 suitably taken, by force, with the one and

the other of these.

  Only the portion 12B has the flare 42.

  For the portion 12A, the conduit 13 remains straight and of uniform rectangular cross section on any

its length.

  In practice, and as shown in FIG.

  corresponding surfaces of this duct 13 are smooth.

  Moreover, in the embodiment shown in FIGS. 1 to 7, the deflection means provided for the oscillating endpiece 30B of the active part 30 of the key 15 consist of a projection 50 acting on a part 51 of the flaring 42 of the conduit 13 of the rotor 12 opposite that on which the piston 44 interacts on which it must act. For example, and as shown, this projection 50 is formed by the end of a screw 54 which extends

  generally transversely to the duct 13.

  Finally, when, as in this case, the oscillating end B of the active part 30 of the key 15 has grooves 40, it intervenes, between the inlet opening 16A of the conduit 13 of the rotor 12 of the safety cylinder 10 according to the invention and the flaring 42 of this duct 13, a perforated screen 56 of which at least part of the contour, forming a filter, is crenellated in the image of the resulting contour of said

  grooves 40 for this oscillating tip 30B.

  For example, FIG. 3, the perforated screen 56 thus has, on one and the other of its sides corresponding to the plates of the oscillating endpiece 30B, protrusions 57, which, respectively respectively, have an implantation and a profile. complementary of the implantation and the profile of the grooves

of this oscillating tip 30B.

  Alternatively, Figure 12, it has such projections 57 only on one of its sides; the oscillating end-piece B may then have grooves 40 only on one of its plates, but in the case of a reversible key, it must present them identically to both of them. this. Anyway, and as shown, the perforated screen 56 thus implemented preferably intervenes in the

  root of the flaring 42 of the duct 13 of the rotor 12.

  In the embodiment more particularly shown in FIGS. 1 to 7, it is in one piece

with the portion 12B of this rotor 12.

  Anyway, intervening at a distance from the inlet outlet 16A of the conduit 13, it is advantageously not possible to easily take the imprint. At the introduction of the active part 30 of the key 15 in the conduit 13 of the rotor 12, FIG. 7A, the oscillating endpiece 30B forming its end is channeled through this conduit 13, until it passes through the filter constituted by the perforated screen 56, while, in its path, the current portion 30A of this active portion 30 pushes the pistons

21 of this rotor 12.

  As the engagement of the key 15 is continued, its oscillating endpiece 30B temporarily abuts against the projection 50 present in the flare 42 of the conduit 13 of the

  rotor 12 following the perforated screen 56.

  This forces it to deflect towards the piston 44 present on the opposite inclined face 43 of this flare 42, FIG. 7B, by rotation about its tilting axis 36, and thus, thus, to act on the head 45 of this piston 44, the projection 50 being duly offset longitudinally accordingly with respect to the latter, being located slightly downstream thereof in the direction

  engaging the key 15 in the conduit 13.

  At the end of the stroke, FIG. 7B, the piston 44 is properly depressed, and, together, it is the same

pistons 21.

  Thus released, the rotor 12 can be controlled by

rotation by the key 15.

  At the withdrawal of it, the various pistons 21 and 44

  return elastically to their original position.

  In the variant embodiment shown in FIG. 8, the projection 50 is formed by a stud 54 'which, instead of extending substantially radially with respect to the rotor 12, like the previous screw 54, extends along a rope of it, biting partly in its thickness, and partly overflowing into the flare 42

of its internal conduit 13.

  If desired, this stud 54 'can itself be used as a filter, then for example to present one or

several grooves.

  In addition, in this variant embodiment, the perforated screen 56 forms a separate piece inserted transversely between the two portions 12A, 12B of the rotor 12, extending over the entire interface between these two portions 12A, 12B. This perforated screen 56 can thus be made in one

  different material than rotor 12.

  For example, while the rotor 12 is made of brass, it can be made of treated steel, while forming, locally, a clean shield to oppose more effectively

  break-in attempts.

  The pins 48 which secure the one to the other of the two portions 12A, 12B of the rotor 12 then jointly ensure the attachment thereof thereof.

perforated screen 56.

  In the variant embodiment shown in FIG. 9, the perforated screen 56 also forms a separate part, but, since the rotor 12 is in one piece, it is

  transversely engaged in a groove 60 of this rotor 12.

  As shown, this bleed 60, and therefore the screen

  perforated 56, passes through the conduit 13 of the rotor 12.

  As a variant, the groove 60 can only lead into this duct 13, without passing through it, the perforated screen 56, which then has projections 57 only on its side, as in the variant embodiment shown in FIG. 12, then only tangent this conduit 13. It is by extension that this screen is still here

called "openwork" screen.

  Be that as it may, instead of belonging, as previously, to a single piece of the rotor 12, the shoulder 20B necessary for its axial retention with respect to the stator belongs, for example, in the embodiment variant shown. in FIG. 9, to a counter-plate 61, suitably attached, for example by screws 62, on this

rotor 12.

  This provision can also be

  adapted in the other embodiments already described.

  This is, in practice, the case if the safety cylinder concerned is a double cylinder, and, in most cases, the plate against -61 is then constituted by a split elastic ring engaged in a groove of an extension,

provided for this purpose, the rotor 12.

  In addition, in the variant embodiment shown in FIG. 9, the deflection means provided in the flare 42 of the duct 13 of the rotor 12 for the oscillating endpiece 30B of the active part 30 of the key 15 consist of by a magnet 65 acting on the inclined face

43 of this flare 42.

  In practice, in the embodiment shown, this magnet 65 surrounds the piston 44 present on

this inclined pan 43.

  It is it which causes the deflection of the oscillating end 30B during the introduction of the key 15, and,

thus, its action on the piston 44.

  Of course, this oscillating tip 30B is then in

steel.

  In the variant embodiment shown in FIG. 10, no perforated screen is provided in the rotor 12 of the cylinder 10, and the oscillating endpiece 30B of the active part 30 of the corresponding key 15, which is not

represented, is then smooth.

  Furthermore, in this variant embodiment, the flaring 42 of the duct 13 results from a simple lateral recess thereof, parallel to its axis, the oscillating end piece 30B, once deflected, then finding

  its support beyond the piston 44 on which it must act.

  Of course, the present invention is not limited to the embodiments described and shown, but encompasses any variant embodiment and / or combination of

their various elements.

  In addition, the key according to the invention can

  indifferently to be reversible or not.

  In addition, if, in the above, only its oscillating tip passes the perforated screen, and is the only one to be grooved accordingly, when such a perforated screen is present, it is obvious that the current portion of its active part can at least partly to cross such a perforated screen, and thus be also at least partially grooved. Finally, instead, as described and shown, the tilting axis of this oscillating endpiece extends, transversely, in the direction of greater elongation of the cross section of the active part of the key, in the thickness of the latter, it may, alternatively, extend perpendicularly to this thickness, parallel to the direction of smaller

  extending said cross section.

Claims (18)

  1. Safety cylinder for a lock, of the type comprising, rotatably mounted in a stator (11), at least one rotor (12) having, parallel to its axis, a conduit (13) suitable for the insertion of a key ( 15), with, in said rotor (12), at least one piston (21) mounted transversely movable relative to said duct (13), so as to be able to protrude into it and thus be able to cooperate with such a key ( 15), and, in correspondence, in said stator (11), a counter-piston (23) whose interface (26) with the piston (21) merges with that (27) between the rotor (12) and the stator (11) only when a suitable key (15) is in place in said conduit (13), characterized in that, for cooperation with a key (15) whose end of the active part (30) forms in together an oscillating mounting end (30B) relative to the current portion (30A) of this active portion (30), the duct (13) of the rotor (12) has, at a distance from its inlet outlet ee (16A), and in the opposite direction thereto, a flare (42) adapted to allow tilting of said oscillating tip (30B), with, on the one hand, opening into said flare (42) at least one piston ( 44) which is associated with a counter-piston (46), and secondly, deflection means adapted to cause effective tilting of said oscillating tip (30B) towards said piston (44), for his action on this one.   2. Safety cylinder according to claim 1, characterized in that said deflection means are constituted by a projection (50) acting on a flange (51) of the flare (42) of the duct (13) of the rotor (12) opposite to the one on which the piston (44) on which act on the oscillating tip (30B).   3. Safety cylinder according to claim 1, characterized in that said deflection means are constituted by a magnet (65).   4. Safety cylinder according to claim 3, characterized in that said magnet (65) surrounds the piston   (44) on which the oscillating tip (30B) must act.   5. Safety cylinder according to any one of   claims I to 4, characterized in that between   inlet outlet (16A) of the duct (13) of the rotor (12) and its flare (42) is a perforated screen (56), one of which   at least part of the contour forming a filter is crenellated.   6. Safety cylinder according to claim 5, characterized in that said perforated screen (56) is of a single   holding with at least a portion (12B) of the rotor (12).   7. Safety cylinder according to claim 5, characterized in that said perforated screen (56) forms a separate piece inserted transversely between two portions (12A, 12B) of the rotor (12).   8. Safety cylinder according to claim 5, characterized in that said perforated screen (56) forms a separate part transversely engaged in a groove. (60) of the rotor (12).   9. Safety cylinder according to any one of   Claims 5 to 8, characterized in that said screen   openwork (56) intervenes at the root of the flare (42) of the conduit (13) of the rotor (12).   10. Safety cylinder-following any one of   Claims 1 to 9, characterized in that the flaring (42)   of the duct (13) of the rotor (12) is defined by at least one inclined section (43) generally oblique with respect to the axis of this led (13).   11. Safety cylinder according to any one of   Claims I to 9, characterized in that the flare (42)   of the duct (13) of the rotor (12) results from a simple   lateral recess of this conduit (13).   12. Safety cylinder key according to one   any of claims 1 to 11, characterized in that   the end of its active part (30) forms a tip (30B), which, as a whole, and within the limits of an angular deflection (D) determined by stop means, is mounted oscillating relative to the portion current (30A) of this active part (30).   13. Key according to claim 12, characterized in that its oscillating tip (30B) has,   longitudinally, at least one groove (40).   14. Key according to claim 13, characterized in that only its oscillating tip (30B) has at least one groove (40).   15. Key according to any one of the claims   12 to 14, characterized in that, at its oscillating end (30B), are associated resilient biasing means (37) permanently urging towards a mean position.   16. Key according to any one of the claims   12 to 15, characterized in that, its active part (30) being generally flat or rhombic, the axis of tilting (36) of its oscillating end (30B) extends transversely, following   the direction of greater elongation of its section.   17. Key according to any one of the claims   12 to 15, characterized in that, its active part (30) being generally flat or rhombic, the tilting axis (36) of its oscillating end piece (30B) extends transversely, parallel to the direction of smaller elongation of its section.   18. Key according to any one of the claims   12 to 17, characterized in that the angular deflection (D)   its oscillating tip (30B) is less than 45 '.