FR2842236A1 - Security lock cylinder has auxiliary pin in recess opposite main pin to resist picking - Google Patents

Abstract

The lock cylinder consists of a rotor (5) turning inside a stator (4) and a main pin (25) that frees the rotor when a key bit (18) is inserted in a slot (13). It has at least one additional pin (40) in a recess (42) located diametrically opposite the main pin and designed to move into a rotor release position by fitting into an appropriate cavity (52) in the key bit.

Description

S RETE LOCK CYLINDER; SET CONSISTING OF A

SUCH A CYLINDER AND A KEY

  The present invention relates to a cylinder for a security lock, of the type having a longitudinal axis and comprising: - a longitudinal stator, having a longitudinal inner peripheral face, of revolution about the axis, - a longitudinal rotor mounted inside the stator and having a longitudinal outer peripheral face, of revolution about the axis, matching the inner peripheral face of the stator in a relation of guiding to the relative rotation around the axis, and an inner longitudinal slot for receiving a removable key bit for operating the lock, said slot being arranged along an axial mean plane and having a determined cross section, - at least one removable locking assembly of the rotor relative to the stator in a determined relative orientation around the axis, said assembly itself comprising, along the same transverse mean plane: * a radial main pin m slidable, in a main radial housing of the rotor, arranged approximately along said axial mean plane, between a locking position in which it has a first end projecting into the slot and a second end recessed with respect to the outer peripheral face and an unlocked position in which its first end projects less or is flush with the slot and its second end is flush with the outer peripheral face, * a radial piston mounted for sliding, in a radial housing of the stator, placed in the extension of the main housing of the rotor in said determined relative orientation, between a locking position in which it has a first end projecting from the inner peripheral face and an unlocking position in which its first end is flush with the outer peripheral face, * hubs ns of elastic stressing of the piston, from its unlocking position and towards its locking position, so that, in said determined relative orientation, the piston applies a push towards the axis to the main pin and tends to bring the latter to its locking position by gaining its own locking position by engaging its first end in the main housing of the rotor, while the passage of the main pin from its locking position to its unlocking position causes the passage of the piston from its locking position to its unlocking position by releasing its first end from the main rotor housing, * at least one auxiliary pin mounted for sliding in a transverse auxiliary rotor housing, offset from the main housing, between a position security in which it has a first end projecting into the slot or flush with the cell e-ci and a second end projecting from the outer peripheral face and a release position in which its first end protrudes more pronounced in the slot and its second end is flush with the outer peripheral face, so that the first end of the auxiliary pin in the safety position bears against the first end of the main pin in the locked position and the passage of the main pin from its locked position to its unlocked position authorizes the passage of the auxiliary pin from its safety position to its release position, * at least one cavity arranged in the inner peripheral face of the stator and placed in the extension of the auxiliary housing of the rotor in said determined relative orientation, so that, in the latter, the second end of the auxiliary pin engages in the cavity in. safety position and that a rotation of the rotor with respect to the stator from said determined relative orientation while the main pin and the piston occupy their unlocking position causes the auxiliary pin to pass from its safety position to its position of release by a cam effect applied by the cavity to the second

  end of the auxiliary pin.

  Generally, in cylinders of this type which are currently known, several copies of such a removable locking assembly of the rotor with respect to the stator in their relative orientation determined around the axis are provided, along transverse mean planes distributed longitudinally, and this will also generally be the case in a cylinder according to the invention. In a cylinder according to the invention as in a cylinder according to the prior art, the presence of the auxiliary pin, sometimes called "filter pin" or "filter piston", makes it difficult to pick as far as a tool inserted in the slot of the rotor for the purpose of pushing the or each main pin from its locked position to its unlocked position, while the rotor and the stator occupy their determined relative orientation with which is generally associated a closed state of the lock, has a high probability of retaining the or each auxiliary pin in its safety position, in which it continues to oppose a rotation of the rotor relative to the stator even if the or each pin

  main has been brought to its locked position.

  In theory, therefore, only the introduction, into the slot of the rotor, of a suitably shaped bit of the key intended to cooperate with the lock makes it possible, at the same time, to bring the or each main pin coercively to its position. release and offer the or each auxiliary pin a clearance allowing it to pass from its safety position to its

  rotor release position relative to the stator.

  However, in cylinders of the aforementioned type which are currently known, the or each auxiliary housing and the cavity which corresponds to it are arranged at right angles to the mean axial plane of the slot, namely most often along another mean axial plane. perpendicular to this axial mean plane of the slot, reference being made to the determined relative orientation of the rotor and the stator with regard to the

  positioning of the or each cavity.

  As a result, the use of a relatively thin tool to attempt to bring the or each main pin to its unlocking position may, in certain cases, result in the or each auxiliary pin not being retained in its position. security by this tool, so that picking the lock does not present any major difficulty if we adopt this known positioning of or each housing

  auxiliary and the corresponding cavity.

  The object of the present invention is to remedy this drawback and, to this end, the present invention provides a cylinder of the type indicated in the preamble, characterized in that the auxiliary housing and the cavity are arranged in a respective position approximately diametrically opposite, with reference to the axis, to the position of the main housing of the rotor and to

  the position of the stator housing, respectively.

  Thus, each auxiliary housing, that is to say also the auxiliary pin which it contains, is located in an area in which, when one seeks to use a tool which one introduces into the slot to try to push the or each main pin from its locking position to its unlocking position, it is practically essential to have a support by the tool for this purpose since this zone is located opposite to the or each main pin at the inside the slot. Consequently, this support is then carried out on the first end of the or each auxiliary pin and tends to move the latter away from the axis, that is to say to strengthen the engagement of its second end in the cavity . The or each auxiliary pin thus firmly retained in its safety position, then retains the rotor against rotation relative to the stator even if it has been successfully brought the or each main pin to its unlocking position. A cylinder according to the present invention therefore offers increased security against

hooking.

  However, the key intended to cooperate with such a cylinder in order to rotate the rotor relative to the stator, from their determined relative orientation, can remain simple and economical to manufacture and, in particular, does not require a movable part unlike to many keys to

safety of the prior art.

  This key, comprising a flat bit shaped so as to be able to engage in a removable manner, by relative longitudinal translation, in the slot of the rotor by having a longitudinal axis coincident with the longitudinal axis of the cylinder and a mean axial plane coincident with the axial mean plane of the slot, up to a determined relative limit position, the bit having for this purpose a section capable of integrating into said determined cross section of the slot, in a guide relationship with relative longitudinal sliding, and defined by two main longitudinal faces, arranged respectively on either side of the axial mean plane of the bit, and by two longitudinal edges, mutually connecting the main faces overlapping the mean plane of the bit, a first of said edges having, in a mean plane transverse which coincides with said transverse mean plane in said limit position, an indentation such that, in ladi te limit position and in said relative orientation, it bears on the first end of the main pin to place the main pin and the piston in the unlocked position, is characterized in that the second of said edges has the same transverse mean plane as said indentation of the first edge a first cavity such that, in said limit position and in said determined relative orientation, it offers at the first end of the auxiliary pin a

  sufficient clearance to allow passage of the latter to its release position.

  A person skilled in the art will readily understand that, although simple and economical to manufacture, such a key is difficult to reproduce insofar as the positioning precision, in relation to the positioning of the indentation of the first song, and of dimensioning of the first cavity of the bit is of great importance, so that both the main pin is brought to its unlocking position and the pin released from a passage from its safety position to its release position when the key reaches its determined limit position inside the slot. On the other hand, the production, by the manufacturer of the cylinder, of a key having a geometry rigorously adapted to this

  effect does not present any particular difficulty.

  We can further increase the precision necessary for the realization of the key, that is to say make it even more difficult to reproduce, by providing that the auxiliary housing is arranged laterally relative to the axial axial plane of the slot, approximately parallel to it, that is to say either rigorously parallel to it, or at a small determined angle with respect to it, for example so that the auxiliary housing converges with this axial mean plane towards the common longitudinal axis of the rotor and the stator. In this case, in fact, the first cavity also affects one of the faces

principal of the bit.

  This lateral arrangement of the auxiliary housing relative to the mean plane of the slot is also advantageous in that it makes it possible to provide two copies of this auxiliary housing, arranged respectively on either side of the axial mean plane of the slot, and two corresponding copies of the auxiliary pin and the cavity, in which case the second edge of the key bit presents two copies of said first cavity, respectively affecting one and the other of the main faces of the key. Such a multiplication of auxiliary housings and auxiliary pins further complicates picking, and the multiplication of the first cavities on the key bit makes it even more difficult to

  unauthorized reproduction of the key.

  Naturally, the provision of at least one auxiliary housing, at least one cavity and at least one auxiliary pin in the characteristic manner of the present invention can advantageously be accompanied by the arrangements already known in terms of anti-picking safety. Thus, according to a preferred embodiment of a cylinder according to the invention, said assembly further comprises, according to said transverse mean plane: - at least one additional pin mounted for sliding in an additional transverse housing of the rotor, arranged approximately perpendicular to the axial axial plane of the slot, between a safety position in which it has a first end projecting into or flush with the slot and a second end projecting from the outer peripheral face and a release position in which its first end protrudes more pronounced in the slot and its second end is flush with the outer peripheral face, so that the first end of the additional pin in the safety position bears against the first end of the main pin in the locked position and that the passage of the main pin blade from its locked position to its unlocked position allows the additional pin to pass from its safety position to its release position, at least one additional cavity provided in the inner peripheral face of the stator and placed in the extension of the additional housing of the rotor in said determined relative orientation, so that therein the second end of the additional pin engages in the additional cavity in the safety position and that a rotation of the rotor relative to the stator from said relative orientation determined while the main pin and the piston occupy their unlocking position causes the additional pin to pass from its safety position to its release position by a cam effect applied by the cavity to the second end of the

additional pin.

  In this case, at least one of the main faces of the key bit, has, along the same transverse mean plane as said indentation of the first edge, at least a second cavity such that, in the limit position and in said relative orientation determined, it offers sufficient clearance at the first end of the additional pin to allow it to move to its position of

release.

  In addition or as a replacement, the cylinder may also comprise at least one other removable rotor locking assembly relative to the stator in said determined relative orientation, said other assembly itself comprising, along the same other transverse mean plane, longitudinally offset with respect to said transverse mean plane: - at least one other pin mounted for sliding in another transverse housing of the rotor, arranged approximately perpendicular to the mean plane of the slot, between a safety position in which it has a first end projecting into the slot or flush therewith and a second end projecting from the outer peripheral face and a release position in which its first end projects more pronounced in the slot and its second end is flush with the outer peripheral face, - at least another cavity in the face inner peripheral of the stator and placed in the extension of the other housing of the rotor in said determined relative orientation, so that, in the latter, the second end of the other pin engages in the other cavity in position safety and that a rotation of the rotor relative to the stator from said determined relative orientation while the main pin and the piston occupy their unlocking position causes the other pin to pass from its safety position to its position of release by a cam effect applied by the other cavity to the

  second end of the other pin.

  In this case, at least one of the main faces of the key bit has, along another transverse mean plane which coincides with said other transverse mean plane in said limit position, at least one third cavity such that, in limit position and in said determined relative orientation, it offers at the first end of the other pin a

  sufficient clearance to allow passage of the latter to its release position.

  Naturally, several of such other removable locking assemblies of the rotor with respect to the stator in their determined relative orientation can be provided, for example alternately, longitudinally,

  with the aforementioned removable locking assemblies.

  Other characteristics and advantages of a cylinder according to the invention and of a key intended to cooperate with such a cylinder will emerge from the

  description below, relating to some examples not

  limiting of realization, as well as attached drawings

  which form an integral part of this description.

  Figure 1 shows a perspective view, with partial cutaway, of a cylinder according to the present invention, the rotor is released vis-à-vis a rotation relative to the stator by introduction of a

  key specifically adapted to the operation of this cylinder.

  Figure 2 shows a view, on a larger scale, of a detail marked in II in Figure 1, and more particularly illustrates a main pin, a piston and an auxiliary pin in the respective unlocking or releasing position of the rotor

relative to the stator.

  Figure 3 shows the same cylinder in section through a plane marked III-III in Figure 1, while the main pin, the piston and the auxiliary pin occupy their locking or safety position against rotation of the rotor relative to the stator,

in the absence of a key.

  Figure 4 shows a larger view

  scale, of a detail identified in IV in Figure 3.

  FIG. 5 shows a view similar to that of FIG. 3 except that the main pin, the piston and the auxiliary pin occupy their position for unlocking or releasing the rotor when rotated relative to the stator, like this. is the case in Figures 1 and 2, due to the introduction of the specifically adapted key. Figure 6 shows, on a larger scale, a

  detail identified in VI in Figure 5.

  Figures 7 and 8 show a perspective view of a key specifically adapted to the operation of a cylinder according to the invention, this key being provided for the case in which the auxiliary pins characteristic of the present invention are two in number , associated with pins

main different.

  Figures 9 and 10 show, in sectional views similar to those of Figures 3 and 5 respectively, an alternative positioning of the

auxiliary pin.

  FIGS. 11 to 14 illustrate, in views similar respectively to those of FIGS. 3 to 6, an alternative embodiment according to which two auxiliary pins are grouped in pairs so as to be able to cooperate with the same main pin in the locked position and with a specially adapted key

  to gain the unlocking position.

  FIG. 15 shows a perspective view of a rotor intended to receive, in addition to the main pins and auxiliary pins according to the present invention, additional pins or other pins in themselves known, capable of occupying a safety position at against a rotation of the rotor relative to the stator in the same way as the auxiliary pin characteristic of the present invention and that the main pin and the piston, in the absence of introduction of a suitable key in the lock, and to gain a position of release of the rotor with respect to a rotation relative to the stator during

  the introduction of a specifically adapted key.

  Figures 16 and 17 illustrate, in a sectional view, along a plane marked in XVI-XVI in Figure 15, the rotor illustrated in this figure 15, the corresponding stator, the main pin, the piston, the auxiliary pin characteristic of the present invention and of the additional pins respectively in their locking or safety position against rotation of the rotor relative to the stator and in their unlocking or releasing position

  of the rotor with respect to a rotation relative to the stator.

  Figure 18 shows a detail spotted in XVIII to

Figure 17.

  Figure 19 shows, in a sectional view through a plane marked in XIX-XIX in Figure 15, parallel to the section plane of Figures 16 to 18, other pins occupying their position of release of the rotor relative to the stator of introduces the key

specifically adapted.

  We will first refer to Figures 1 to 8, which correspond to the same embodiment of an assembly according to the invention, consisting of a cylinder 1 according to the invention and a key 2 specifically adapted

when operating this cylinder 1.

  In a manner known per se, in this non-limiting example of implementation of the invention, the cylinder 1 has an elongated shape along a longitudinal axis 3 and comprises a longitudinal stator 4 in which are housed two longitudinal rotors 5, mutually juxtaposed along the axis 3, to allow the operation of the cylinder 1, by means of a key 2 specifically adapted, from one or the other of its transverse ends. The two rotors 5 cooperating in a strictly identical manner with the stator 4, on the one hand, the key 2, on the other hand, only one of these rotors 5 will be described below, it being understood that the

  description will apply to the other

  rotor 5, as a person skilled in the art will readily understand.

  Likewise, a person skilled in the art will readily understand that the applications of the present invention are not limited to the case of a cylinder with two rotors and that the concept of "safety cylinder" should be understood, within the meaning of the present invention. , as encompassing any safety closure means comprising a stator and at least one rotor cooperating in the manner described or in a similar manner, whatever their mode of cooperation with other components and their conformation to the effect of this cooperation. Thus, by way of nonlimiting examples, the present invention may be applied to locks installed permanently such as door, cover or drawer locks, or to locks which are installed if necessary,

  such as padlock or anti-theft locks.

  To receive the rotor 5, the stator 4 is hollowed right through, longitudinally, with a bore 6 delimited towards the axis 3 by an inner peripheral face 7 longitudinal, cylindrical of revolution around this axis, this face 7 opening into one and the other direction of the axis 3 in a respective transverse front face 8 of the stator 4. Between these front faces 8 and at equal longitudinal distance from each other, the inner peripheral face 7 opens out also in a transverse slot 9 of the stator 4, which houses in a manner known in itself a drive mechanism of a bolt not shown, which mechanism 10 itself driven in rotation by one or the other rotors 5 when the latter rotates around the axis 3 inside the stator 4 under the action of a

appropriate key 2.

  Additionally, each rotor 5 is delimited, in the direction of a distance with respect to the axis 3, by an outer peripheral face 11 cylindrical of revolution around the axis 3 with a diameter substantially identical to that of the inner peripheral face 7 so that there is established between the outer peripheral face 11 of each rotor 5, housed in a corresponding part of the stator 4, and the inner peripheral face 7 thereof a mutual contact for guiding the relative rotation around the axis 3. The outer peripheral face 11, thus oriented longitudinally, has a longitudinal dimension approximately equal to the distance longitudinally separating the slot 9 from one or other of the front faces 8, between a front face 12 of the rotor 5, which is transverse and approximately flush with a respective front face 8, and another front face not visible in the figures, housed inside the slot e 9 and shaped so as to cooperate with the drive means 10 so that the latter rotate around the axis 3, relative to the stator 4, accompanying the rotational movement of one of the rotors relative to the stator 4 under the action of an appropriate key 2. The conformation, for this purpose, of this other front face of each rotor 5 and the corresponding conformation of the means 10 for driving a bolt are well known to a person skilled in the art, and are

  indifferent to the present invention.

  In a manner also known in itself, each rotor 5 is hollowed from one to the other of its front faces such as 12 of a longitudinal slot 13 which is arranged along a mean longitudinal plane 14 including the axis 3 and which opens on the one hand longitudinally into each of the front faces such as 12 of the respective rotor 5 and on the other hand into the outer peripheral face 11 thereof, on one side of the axis 3, over the entire dimension longitudinal of the outer peripheral face 11. With regard to this mode of arrangement of the slot 13 in a rotor 5, reference may be made to FIG. 15 certainly relating to another mode

  for implementing the present invention.

  When viewed in section through any transverse plane, the slot 13 has a constant cross section, defined by two main longitudinal faces 15, 16, having a planar base shape, arranged respectively on either side of the plane 14 to which these two faces 15 and 16 are parallel, and by a bottom 17 also longitudinal but oriented perpendicular to the plane 14 that this bottom 17 overlaps. The bottom 17 closes the slot 13 opposite the connection of the latter to the outer peripheral face 11 of the rotor 5, and is located on the other side of the axis 3 relative to this connection but closer to

axis 3 as this connection.

  The main faces 15 and 16 as well as the bottom 17 are connected longitudinally to one and the other of the front faces such as 12 durotor 5, the main faces 15 and 16 are also connected to the outer peripheral face 11 of the rotor 5 , and the bottom 17 mutually connects the main faces 15 and 16 opposite their connection with this face

external device 11.

  In a manner known in itself, the main faces 15 and 16 have at least one longitudinal rib projecting from their basic shape and thus define on at least one of them an alternation of ribs and longitudinal grooves the positioning and sizing of which are such that it is only possible to introduce into the slot 13 a longitudinal bit 18 of a flat key 2 having a current cross section, also defined by ribs and longitudinal grooves, suitable for integrating into the cross section thus defined for the slot 13, as illustrated in FIGS. 5 and 6 and as it is

well known to a person skilled in the art.

  This current cross section of the key bit 18 of the key is defined by two main longitudinal faces 19, 20 thereof, having a flat base shape, arranged respectively on either side and parallel to an average longitudinal plane 21 which is coincides with the plane 14 when the bit 18 of the key 2 is introduced into the slot 13, the two main faces 19 and 20 then sliding longitudinally against the main faces 15 and 16 of the slot 13, and by two longitudinal edges 22 and 23 each of which overlaps the plane 21 and which mutually connect the main faces 19 and 20. In the basic planar shape of the main faces 19 and 20 of the bit 18 are hollowed out the abovementioned longitudinal grooves thereof, which are complementary to the longitudinal ribs of the main faces 15 and 16 of the slot 13 and define complementary longitudinal grooves of the longitudinal ribs of these main faces 15 and 16. The edge 22 has the shape of a part of cylinder of revolution around an axis 24 which is included in the plane 21 and merges with the axis 3 when the bit 18 of the key 2 is introduced into the slot 13, with a diameter substantially identical to that of the inner peripheral face 7 of the stator 4, against which the edge 22 slides longitudinally and rests in the direction of a distance from the axes 3 and 24 then combined during the introduction of the bit 18 of the key 2 in the slot 13. The edge 24, for its part, is defined by generatrices perpendicular to the plane 21 but has a longitudinal development in sawtooth, which is characteristic, as well as the cross section of the bit 18 compared with that of the slot 13, of a key 2 intended to cooperate with a rotor 5 determined to maneuver it in rotation about the axis 3 relative to the stator 4 while a bit 18

  conformed differently does not offer this possibility.

  To this end, the rotor 5 has main pins 25 guided in radial sliding with reference to the axis 3, along the mean plane 14, in respective main housings or bores 26, mutually juxtaposed longitudinally, from the bottom 17 of the slot 13 of the rotor 5. Each of these bores 26 has a cylindrical shape, generally of revolution, around a respective axis 27 located in the plane 14 and perpendicularly cutting the axis 3, and opens opposite the bottom 17 of the slot 13, along the respective axis 27, in the outer peripheral face 11 of the rotor 5. Perpendicular to this axis 27, each

  bore 26 has a constant section.

  Perpendicular to the plane 14, the dimension of each bore 26 is equal to an overall width 1 of the slot 13, measured between two planes 28, 29 mutually parallel and mutually symmetrical with respect to the plane 14, along which are placed flat zones of the basic shape of the main faces 15 and 16 of the slot 13, which flat areas are the areas of these

  sides 15 and 16 furthest from plane 14.

  Each main pin 25 has a substantially constant cross section perpendicular to the respective axis 27, substantially identical to that of the respective bore 26 so as to be guided to slide inside thereof along the axis 27, if it is only that it presents towards the inside of the slot 13 an end 30 in a warhead, intended to cooperate with the edge 23 of the bit 18 of the key 2, and on the opposite end an end 31 slightly convex, for example flat, perpendicular to axis 27 and provided with a peripheral chamfer. When, as is frequent, the bore 26 is cylindrical of revolution around the axis 27, the associated pin 25 has

  also a form of revolution around this axis.

  Between its ends 30 and 31, along the respective axis 27, each pin 25 has an overall dimension or length L which is specific to the edge zone 24 to which its end 30 faces along the axis 27 once l 'The bit 18 is introduced longitudinally into the slot 13, from the face 12 of the rotor 5, to a determined limit position, illustrated in Figure 1, which is the position in which the rotor 5 can be rotated around the axis 3 relative to the stator 4 if the key 2 actually has a bit 18 of required conformation to

this effect.

  More precisely, this length L is such that, when the pin 25 bears by its end 30 against the edge 24 of the bit 18 of the key 2 occupying this predetermined limit position, as shown in FIGS. 5 and 6, its other end 31 is flush with the outer peripheral face 11 of the rotor 5 and the inner peripheral face 7 of the stator 4, which corresponds to an unlocking position of the rotor 5 with respect to a rotation about the axis 3 relative to the stator 4 ,

  as will become apparent from the following description, each

  pin 25 then being able to slide by its end 31 on the inner peripheral face 7 of the stator 4,

  way not illustrated but known to a skilled person.

  As will also emerge from the rest of the

  description, in this unlocked position,

  the end 30 of the pin 25 forms a minimum projection inside the slot 13, relative to the

  bottom 17 thereof, or even outcrop this bottom 17.

  In all the figures, the rotor 5 is illustrated in a determined orientation around the axis 3 relative to the stator 4, which is that in which the rotor 5 can be locked relative to the stator 4 to

  against a relative rotation around axis 3.

  If one refers to this determined orientation, the stator 4 has along axes 32 which then coincide respectively with the axes 27 and, in particular, are arranged along the same plane 33 including the axis 3 and then coinciding with the plane 14, housings or bores 34 which have a constant section perpendicular to the respective axis 32, identical to that of a bore 26 which they thus extend respectively in said determined relative orientation. In particular, like the bores 26, the bores 34 may advantageously be cylindrical of revolution about their axis, with an approximately identical diameter for all the bores 26 and 34. Each of the bores 34 opens into the inner peripheral face 7 of the stator 4, towards axis 3, but it is closed on the opposite by a

respective fixed cap 35.

  In each bore 34 is mounted to slide along the respective axis 32 a respective piston 36 which has perpendicular to the respective axis 32 a constant section, substantially identical to that of the respective bore 34 and for example cylindrical of revolution around the respective axis 32 like this bore 34, between one end 37 facing the axis 3 and one end 38 facing the opposite, that is to say towards the

plug 35 of bore 34.

  A helical spring 39 is interposed in compression along the respective axis 32 between each plug 35 and the end 38 of the corresponding piston 36 respectively, so as to elastically urge it in the direction of a projection towards the axis 3 relative to the inner peripheral face 7 of the stator 4, so that, when the rotor 5 occupies with respect to the stator 4 the predetermined orientation illustrated in the figures, each piston 36 is supported by its end 37 against the end 31 of the main pin 25 corresponding and, in the absence of a key as illustrated in Figures 3 and 4, thus pushes the corresponding pin 25 towards the inside of the slot 13 in

  entering the corresponding bore 26.

  In a manner known to a person skilled in the art, each piston 36 and each bore 34 are dimensioned such that: - in the position illustrated in FIGS. 3 and 4, in which the end 30 of the pin 25 thus pushed back by the piston 36 forms a maximum projection inside the slot 13, with respect to the bottom 17 thereof, in a limited manner for example by abutment of the end 30 against a rib of one of the main faces 15 and 16, and in which the other end 31 of this pin 25 is set back along the respective axis 27 relative to the outer peripheral face 11 of the rotor 5, the piston 36 remains partially engaged in the corresponding bore 34 and thus overlaps the transition between the inner peripheral face 7 of the stator 4 and the outer peripheral face 11 of the rotor, the spring 39 remaining in compression along the axis 34, which defines a locking position of the rotor 5 against a rotation car ur of the axis 3 relative to the stator 4, and that - when, on the other hand, a bit 18 of appropriate conformation is introduced into the slot 13 up to the aforementioned determined limit position and pushes back by its edge 24 the main pin 25 up to its unlocking position illustrated in FIGS. 5 and 6, that is to say when the end 31 of the main pin 25 is flush with the external peripheral face 11 of the rotor 5 and when its end 30 forms a projection less than inside the slot 13 or flush with the bottom 17 thereof, the piston 36 is sufficiently pushed back inside the bore 34 so that its end 37 is flush with the inner peripheral face 7 of the stator 4 without its end 38 reaches the plug 35, from which it remains separated by the spring 39 then undergoing an increase in compression, so that the rotor 5 can rotate around the axis 3 relative to the stator 4 while the piston 36 remains supported by its extrémit é 37 against the peripheral face

outer 11 of rotor 5.

  Preferably, like the end 31 of the main pin 25, the end 37 of the piston 36 has a convex shape, for example a planar shape, perpendicular to the axis 33 and peripherally chamfered, as is known to a man. of the trade, to facilitate the initiation of this relative rotation. These provisions are common to cylinder 1 according to the invention and to cylinders of the prior art and, well known to a person skilled in the art, do not require

more description.

  By cons, we will now describe an arrangement characteristic of the present invention, Figures 1 to 8 illustrate a first example not

limiting of implementation.

  According to the present invention, at least one of the main pins 25 is associated with at least one auxiliary pin 40 mounted for sliding, along an axis 41 at least approximately parallel to the axis 27, in an auxiliary bore 41 arranged in the rotor 5 in a position approximately diametrically opposite, with reference to the axis 3, to that of the bore 26 for receiving the main pin 25,

or main bore 26.

  In the example illustrated in FIGS. 1 to 8 to which reference will be made first, two of these auxiliary pins 40 are provided, each of which is associated with a respective main pin 25, but this number is only a non-limiting example of

auxiliary pins 40.

  These two pins 40 being mounted in a similar manner and cooperating in a similar manner with the corresponding main pin 25, with the bit 18 of the key 2 in its aforementioned limit position for introduction into the slot 13 of the rotor 5, and with the stator 4 , only one of these pins 40 will be described

  structurally and functionally.

  The axis 41, arranged parallel to the axis 14 in this example, is located in the same plane 43, perpendicular to the axis 3, as this axis 14 from which it is distant by a distance d greater than the distance not referenced separating each of the planes 28 and 29 from this plane 14, although remaining very much less than the radius not referenced from the outer peripheral face 11 of the

rotor 5.

  The auxiliary bore 42, arranged along the axis 41 in the outer peripheral face 11 of the rotor 5, is blind and has two zones each having a constant section perpendicular to the axis 41, namely for example a circular section, with reason a zone 43 of mouth in the external peripheral face 11 of the rotor 5 and a bottom zone 44 which has with reference to the axis 41 a radius r less than the distance d, on the one hand, and the radius R of the mouth zone 43, also less than d, on the other hand, so that

  the auxiliary bore 44 interferes with the slot 13.

  The two zones 43 and 44 of the bore 42 are mutually connected by an annular shoulder 45 plane, perpendicular to the axis 41 and of revolution around

  of this axis in the nonlimiting example illustrated.

  The pin 40 is in turn shaped so as to be guided in the coaxial sliding in the bore 42 and, for this purpose, it is delimited in the direction of a distance from the axis 41 by two sections 46, 47 of external peripheral face, having perpendicular to the axis 41 of the respective constant sections, substantially identical to those of the zones 43 and 44 of the bore 42, respectively, so as to establish between the section 46 and the zone 43, of a on the other hand, the section 47 and the zone 44, on the other hand, a mutual contact for guiding the following relative sliding

axis 41.

  The two zones 46 and 47 are mutually connected by an annular, planar shoulder 48, perpendicular to the axis 41 and thus placed opposite the shoulder 45. Towards the bottom of the bore 42, the section 47 of the outer peripheral face is connected to a flat end 48, perpendicular to the axis 41 and peripherally chamfered, while, opposite the bottom of the bore 42, the section 46 of the outer peripheral face is connected to a convex end 49, and more precisely hemispherical centered on axis 41 in

the example illustrated.

  Along the axis 41, the bore 42 and the pin 40 are dimensioned, in a manner easily determinable by a person skilled in the art, such that: when the main pin 25 occupies its unlocking position, illustrated in FIGS. 5 and 6, due to the introduction of the bit 18 of the appropriate key 2 up to the limit position in the slot 13, the end 49 is flush with the outer peripheral face 11 of the rotor, namely more precisely the non-illustrated geometric cylinder defining the envelope of this outer peripheral face 11 while the end 48 is located in the immediate vicinity of the bottom of the bore 42, that is to say form inside the slot 13, in the common direction of the axes 41 and 27, a projection which will subsequently appear to be maximum, and that the shoulder 48 abuts towards this bottom on the shoulder 45, and that - when the main pin 25 occupies its locking position, illustrated in f Figures 3 and 4, under the effect of the piston 36 partially engaged in the main bore 26, the end 30 of the pin 25, bearing on the peripheral chamfer of the end 48 of the auxiliary pin 40, places the pin auxiliary in a position in which its end 48 is comparatively distant from the bottom of the auxiliary bore 42, that is to say forms a lesser projection inside the slot 13 in the common direction of the axes 41 and 27, or even flush with the slot 13 taking into account the ribbed conformation of its main faces, and its end 49 protrudes relative to the face

  outer device 11 of the rotor 5.

  In this latter position, the end 49 of the pin 40 engages in a localized cavity 50 arranged in the inner peripheral face 7 of the stator 4, in a position approximately diametrically opposite that of the bore 34 relative to the axis 3, so that this position of the auxiliary pin 40, corresponding to the locking position of the main pin 25 and the piston 36, constitutes a safety position in which the pin 40 is opposed, in the same way as the piston 36, at a rotation of the rotor 5 around the axis 3 relative to the stator 4. It will be observed that no means other than the main pin 25, then pushed back by the piston 36 itself pushed back by the spring 39, is is provided inside the rotor 5 to bring the auxiliary pin

to this safety position.

  On the other hand, the position of the auxiliary pin illustrated in FIGS. 5 and 6 constitutes a position for releasing the rotor 5 from rotation about the axis 3 relative to the stator 4, in relation to the unlocking position in this respect that then occupy the pin

main 25 and piston 36.

  To facilitate passage of the auxiliary pin 40 from its safety position to its release position when, after the main pin 25 has gained its unlocking position, the rotor 5 is started to rotate around the axis 3 relative to to the stator 4 by acting on the key 2, the cavity 50 preferably has a rounded shape such that it can exert on the end face 49 of the auxiliary pin 40 a cam effect which causes mutual disengagement, in case o this would not occur naturally, when the rotor 5 starts to rotate relative to the stator 4. Then, the pin 40 is retained in its release position by pressing and sliding its end 49 on the peripheral face

inside 7 of the stator.

  However, the passage of the auxiliary pin 40 from its safety position to its release position, or the possibility of such passage, when inserting the bit 18 of the key 2 to its predetermined limit position at the inside the slot 13 of the rotor 5, assumes that the bit 18 of the key 2 is suitably arranged to clear a passage for the pin 40, that is to say in a way to complete the bore 42 towards the plane 14 for the purposes of such a passage. Failing that, that is to say if the key 2 is not the one which is intended to maneuver the cylinder 1 and to suppose that one can introduce its bit into the slot 13 due to a section of this bit adapted to that of this slot 13, or if any tool is inserted into the slot 13, the auxiliary pin 40 must on the other hand, with as great a probability as possible, remain

in its safety position.

  To thus receive the pin 40 in the release position when it occupies its predetermined limit position for longitudinal introduction into the slot 13, the bit 18 has, along a plane 51 which then coincides with the plane 43 and along which the edge 23 of the bit 18 has an indentation suitable for bringing the main pin 25 into the unlocked position, a cavity 52 hollowed out in the edge 22 and in that 20 of the main faces 19, 20 which is then located on the same side of the plane 14 as the auxiliary pin 40 , that is to say which applies to that 16 of the main faces 15, 16 of the slot 13 into which opens

the auxiliary bore 42.

  When several auxiliary pins 40 are provided, along axes 41 arranged in respective planes 43 mutually offset longitudinally, the bit 18 comprises several of these cavities 52, suitably shaped, in respective transverse planes 51 coinciding with the aforementioned planes 43 when the key occupies its limit position of introduction into the

slot 13 by its bit 18.

  Naturally, the bit 18 must also be shaped so that, at least in its safety position, the or each auxiliary pin 40 does not constitute an obstacle to the longitudinal introduction of the bit 18 of the key 2 into the slot 13 up to the aforementioned limit position, then the extraction of the key bit, when the rotor 5 occupies with respect to the stator 4 the determined orientation illustrated in FIGS. 1 to 6, and that the key 2 is actually a

  key with which the rotor 5 is intended to cooperate.

  To this end, in particular, the cavity 52 is delimited towards the mean plane 21 of the bit 18 by a planar face 53 parallel to this mean plane 21 or arranged along the latter and extending on the one hand longitudinally up to the free end 54 of the bit 18, that is to say the end of the latter which is longitudinally opposite the zone 55 for manually gripping the key, and transversely to the edge 22, on the one hand, and , opposite this edge 22, up to an approximately longitudinal shoulder 56 of the bit

18, on the other hand.

  This shoulder 56 is turned opposite to the edge 24, offset towards the latter relative to the edge 22 and can be defined by generators perpendicular to the plane 21 or, as illustrated, by generators oblique to this plane so as to move away from the edge 22 in the direction of a distance with respect to this plane 21. The shoulder 56 is shaped so as to constitute for the end face 48 of the or each auxiliary pin 40 a path of longitudinal cam having at the level of the free end 54 of the bit 18 a slope 57 approaching the edge 22 in the direction of a longitudinal distance from the free end 54, so that the engagement of the bit 18 translate by a passage of the or each pin 40 from its release position to its safety position, under the effect of a thrust applied by the slope 57 to its end face 48, then a flat 58 having a constant spacing through relative to the edge 22 to maintain the or each auxiliary pin 40 in this safety position until the plane 51 and the cavity 52 closest to the free end 54 reach the level of the plane 43 closest to the face frontal 12 of the rotor 5, then a depression 59 forming a bottom for the cavity 52 along the plane 51 in question then, if several auxiliary pins 40 are provided along different planes 51 as illustrated in FIGS. 7 and 8, a new flat 60 similar to the flat 58 to a depression 61 constituting, along the following plane 51, a bottom for the next cavity 52, and so on, if more than two auxiliary pins 40 follow one another along the slot 13, not illustrated but easily

  understandable by a skilled person.

  Each of the depressions 59 and 61 has a development such that it constitutes for the end 48 of the or each pin 40 a cam path allowing the passage of the or each pin 40 to its release position when the corresponding planes 51 coincide with the corresponding plane 43, and causing the extraction of the end face 48 of the pin 40 in question out of the depression 59 or 61, until the passage of this pin to its safety position, when doing again slide the bit 18 of the key 2 longitudinally in the slot 13 either during its introduction to the aforementioned limit position, in which the or each auxiliary pin 40 occupies its release position by engaging its end face 48 in a depression 59 or 61 constituting the bottom of the respective cavity 52, either during the extraction of the bit 18 from the key out of the slot

13.

  The dimensioning, for this purpose, of the different parts of the bit 18 of the key 2, of the different parts of the rotor 5 and of the stator 4, as well as of the or each auxiliary pin 40 is a skill

normal of a skilled person.

  Such a person skilled in the art will easily understand that a rigorous parallelism of the axis 41 of the or each auxiliary bore 42 and of the corresponding auxiliary pin 40 is not strictly essential and provision may be made, as illustrated. in Figures 9 and 10, that the axis 41 is slightly inclined relative to the plane 14, for example so as to approach it in the direction of approximation relative to the axis 3, the bit 18 of the key 2 can meanwhile remain unchanged if this inclination constitutes the only difference compared to the embodiment described with reference to Figures 1 to 6. An angle a of the order of a few degrees between the axis 41 and the plane 14 can thus be admitted without inconvenience, and without it resulting in a difference in the mode of cooperation of the auxiliary pin 40, by its end 48, on the one hand with the main pin 25 in the locked position, as has been illustrated in figure 9 o the pin at xiliary occupies its safety position, by engagement of its end 49 in a cavity 50 suitably arranged, and with a cavity 52 of the bit 18 of the key in the unlocked position, illustrated in FIG. 10, in which the main pin 25 and the piston 36 occupies their unlocking position and the pin

  auxiliary 40 its release position.

  In addition, as shown in FIGS. 11 to 14, at least one auxiliary pin 40 can be provided, arranged and oriented as described with reference to FIGS. 1 to 6, or also arranged and oriented as described with reference to FIGS. 9 to 10, not only on one side of the mean plane 14 of the slot 13 of the rotor, but also on either side of this mean plane 14, in positions that are mutually symmetrical with respect to that here, along the same transverse mean plane 43, by providing suitable cavities 50 in corresponding positions, located respectively on either side of the plane 21 and mutually symmetrical with respect thereto, along the aforementioned transverse mean plane 43 . Naturally, the bit 18 must then present respectively on either side of its mean plane 21 of the corresponding cavities 52, along the same mean plane

transverse 51.

  Under these conditions, two auxiliary pins which correspond by mutual symmetry with respect to the plane 14 simultaneously occupy their safety position, by pressing the end 30 of the same corresponding main pin 25 in the locked position, under the effect of the piston. 36 itself subjected to the action of the spring 39, on the end face 48 of each of these two auxiliary pins 40, as illustrated in FIGS. 11 and 12, while the introduction of the bit 18 of the key 2 suitable for cooperation with the lock 1 in question makes it possible to simultaneously bring the main pin 25 and the piston 36 to their unlocking position and the two auxiliary pins 40 to their release position, as illustrated in FIGS.

Figures 13 and 14.

  Naturally, the more auxiliary pins 40 are provided, either by association of a pair of such auxiliary pins 40 with the same main pin 25, or by multiplication of these auxiliary pins along the slot 13, the greater the probability that the introduction the bit of an inappropriate key or any tool in the slot 13 is accompanied by a retention of at least one of these auxiliary pins 40 and / or at least one of these main pins 25 in the safety or locking position, respectively, is high, and the more the cylinder 1 is able to resist

an attempt at picking.

  In addition, for this purpose, one or more auxiliary pins 40 in accordance with the present invention may be supplemented by one or more filter pins arranged in accordance with the prior art, as illustrated by way of nonlimiting example in the figures 15 to 19 which will now be referred to and to which we find, in addition to an auxiliary pin 40 according to the present invention, which auxiliary pin 40 could be provided in several copies as described above, two types of compliant filter pins in the prior art, namely on the one hand filter pins 62 brought coercively into the safety position in the same way as the auxiliary pin 40 by the action of a main pin 25 in the locking position, as illustrated in FIG. 16, and capable of also gaining this safety position during the insertion of the bit of an inappropriate key or any tool as in the slot 13, when they are likely to gain a release position in the same way as the auxiliary pin 40 when the bit 18 of an appropriate key 2 is inserted in the slot 13 until the limit position of maximum mutual engagement, as illustrated in FIG. 17, and on the other hand filter pins 63 on which no main pin acts but which are capable of gaining a safety position coercively, from a position locking, if the bit 18 of an inappropriate key 2 or any tool is inserted into the slot 13, these pins 63 being illustrated in the release position corresponding to the introduction of the bit 18 of a key suitable for FIG. 19 It is understood, however, that it would not be departing from the scope of the present invention by providing, in the same cylinder 1, exclusively at least one pin 40 according to the invention, in combination with a main pin e 25, or at least one of these auxiliary pins 40 according to the invention, associated with a main pin 25, and either one or more filter pins 62, or one or

several filter pins 63.

  With the exception of the arrangements necessary for receiving pins 62 and 63, the rotor 5 and the stator 4 of the lock cylinder 1 illustrated in FIGS. 15 to 19 as well as the bit 18 of the key are identical to those which have been described with reference to Figures 1 to 8, so that we have kept in Figures 15 to 19 the same reference numerals as in Figures 1 to 8 to designate

  the various components already described.

  The filter pins 62 and 63 as well as their mode of cooperation with the rotor 5, the stator 4 and the bit 18 of the key being already known, they are not known.

will describe only briefly.

  The arrangements linked to the presence of the filter pins 62 will firstly be described, two copies of which are here provided in association with a main pin 25 with which is also associated a single auxiliary pin 40, it being understood that only one pin 62, or even more than two pins 62, and / or two pins 40, arranged as described with reference to FIGS. 11 to 14, could be provided in

  association with a main pin 25.

  To receive each of the pins 62, the rotor is pierced with a respective housing in the form of a bore 64 having a respective transverse axis 65,

  arranged in the same plane 43 as the axes 27 and 41.

  Each axis 65 is perpendicular to the plane 14 and, more precisely, the axes 65 are combined in the example illustrated, but these axes could also have a slight obliquity relative to a direction perpendicular to the plane 14, in a manner not illustrated but

known to a person skilled in the art.

  The two bores 64 are arranged so as to open on the one hand into the slot 13, in the direction of the plane 14, and on the other hand into the external peripheral face 11 of the rotor 5, in the direction of a distance from the plane 14 and may have, in the direction of a distance from the axis 65, a conformation similar to that which the bore 42 has in the direction

  a distance from its axis 41.

  Each bore 64 receives and guides to sliding, along the respective axis 65, the respective pin 62 which also has a conformation at all points similar to that of the pin 40, with a dimensioning such that: - in a safety position, illustrated in FIG. 16, corresponding to the locking position of the main pin 25 and to the safety position of the auxiliary pin 40, each pin 62 has towards the plane 14 a first end 66 bearing against the main pin 25 between the two ends 30 and 31 thereof, that is to say flush with one, respectively, of the main faces 15 and 16 of the slot 13, or protruding minimally inside thereof according to l 'respective axis 65, and another end 67, turned in the direction of a distance from the plane 14, projecting from the outer peripheral face 11 of the rotor 5, and that - in a release position illustrated FIG. 17, corresponding to the unlocking position of the main pin 25 and to the release position of the auxiliary pin 40, further illustrated in FIG. 18, the end 66 of each of the pins 62 is placed in projection, or in more pronounced projection, towards the plane 14 relative to the respectively corresponding main face 15, 16 of the slot 13 and the end 67 is flush with the outer peripheral face 11 of the rotor 5. As are the ends 48 and 49 of the pin auxiliary 40, the ends 66 and 67 of each pin 62 respectively have a flat shape bordered by a peripheral chamfer and a convex hemispherical shape intended respectively to facilitate the passage of each pin 62 from its release position to its safety position under the thrust of the ogival end 30 of the main pin 25 when the latter passes from its unlocking position to its lock position illage then the support against the main pin 25 in the unlocked position and to authorize cooperation with a cavity 68, at any point similar to the cavity 50, arranged in the inner peripheral face 7 of the stator 4, in the extension of each bore 64 respectively, in the determined relative orientation of the rotor 5 and the stator 4 in which they can be mutually locked, under conditions similar to the conditions in which the end 49 of the pin

40 cooperates with the cavity 50.

  Thus, not only the passage of the main pin 25 from its unlocking position to its locking position brings the pin 40 and each pin 62 from its release position to its safety position, but the return of the main pin 25 from its unlocking position to its locking position allows each of the pins and 64 to return to its release position by a cam effect applied by the respective corresponding cavity 50, 68 to the hemispherical end face 49, 67 of the pin respectively corresponding 40, 62. The passage of each of the pins 62, in the same way as the pin 40, from its safety position to its release position assumes, however, that the bit 18 of the key 2, introduced to its limit position in the slot 13, facing the ends 66 of the two pins 62, in its main faces 19 and 20, a respective cavity 69 suitable for receiving n of a respective end 66, in the same way that it has a cavity 52 for receiving the

  pin 40 in the release position.

  If the bit of a key inserted into the slot 13 does not have such a cavity 69 along the plane 51 coinciding with the plane 43 in the limit position of introduction of this bit into the slot 13, or if any tool is inserted in the latter in place of the bit 18 of the appropriate key 2, the pins 62 are retained in their safety position in the same way as the pin 40, it being understood that it is sufficient for only one of these pins 40 and 62 remains in the safety position so that the rotation of the rotor 5 relative to the stator 4 is prohibited, even if it has been successfully brought the main pin 25 into the unlocked position. Unlike pins 62 which, like pin 40, are arranged in the same transverse plane

  43 than a main pin 25 to form therewith

  ci a rotor locking assembly 5 relative to the stator 4, assembly in which the pin 25 in the locking position coercively brings each of the pins 40 and 62 to its safety position while the passage of the main pin 25 to its position unlocking allows passage of each of the pins 40 and 62 to its release position, as soon as the bit 18 of the appropriate key 2 is inserted up to its limit position in the slot 13, the pins 63 form an assembly independent of any pin 25 and, for this purpose, arranged in another transverse plane 70, longitudinally offset from

  in plane 43 and parallel to it.

  The two pins 63, illustrated in FIG. 19 in a position for releasing the rotor 5 from a rotation relative to the stator 4, are arranged, like the pins 62, respectively on either side of the plane 14 but it is understood that one could provide only one of these pins 63, on one side of the

plan 14.

  At all points similar to the pins 62, the pins 63 are slidably mounted in a respective bore or housing 71 transverse of the rotor 5, which bore 71 is in all points similar to a bore 64 and has a transverse axis 72, arranged in the plane 70 and oriented perpendicular to the plane 14, as illustrated in FIG. 19, or alternatively approximately perpendicular to this plane 14, that is to say with a shift of the order of a few degrees relative to this

plan 14.

  In the example illustrated in which the axes 72 are perpendicular to the plane 14, they coincide in the same way as the axes 65, it being understood that, like the axes 65, the axes 72 could also be mutually offset in the respective plane 70 .43 even

  when they are thus perpendicular to the plane 14.

  Each of the bores 71 opens on the one hand into the slot 13, through one of the main faces 15, 16 of the latter, and on the other hand into the outer peripheral face 11 of the rotor 5. In alignment with each bores 71 if one refers to the determined orientation of locking of the rotor 5 with respect to the stator 4, illustrated in FIG. 19, the inner peripheral face 7 of the stator 4 is hollowed out by a respective cavity 73 in

  any point similar to the cavities 68.

  For reasons of space, that is to say to allow to arrange in the same rotor 5 a maximum of bores 71 and a maximum of bores 62, the bores 71 are offset from the bores 62 if one observes them in a longitudinal direction, as is the case in FIGS. 16, 17, 19. For this purpose, as illustrated by way of nonlimiting example, the bores 71 open into the slot 13 closer to the mouth of the latter in the outer peripheral face 11 of the rotor 5 than of the bottom 17 of the slot 13 while the bores 64 open closer to this bottom 17 than of the mouth of the slot 13 in the outer peripheral face 11 of the rotor 5. Other provisions could however be adapted without departing from the scope of the

present invention.

  Each of the pins 63 has, in a manner quite similar to the pins 64, an end 74, planar and bordered by a peripheral chamfer, facing the plane 14 and an end face 75, hemispherical convex, facing in the direction d 'a distance from the plane 14, and can evolve by coaxial sliding in the respective bore 71 between two positions, namely: - a release position, illustrated in Figure 19, in which the end face 74 forms a protrusion inside the slot 13 and in which the end face 75 is flush with the outer peripheral face 11, which allows the rotation of the rotor 5 relative to the stator 4 provided that the pins 25, 40 and 62 occupy also their release position, and - a safety position, not shown, in which the end face 74 is flush with the respectively corresponding main face 15, 16 of the slot 13 or, more generally, forms a less projection in the latter 20, while the end face 75 forms a projection relative to the outer peripheral face 11 of the rotor and engages in the respective cavity 73. Thus, in the absence of any bit 18 of key 2 in the slot 13, in the absence of any tool inserted into this slot 13 to attempt to pick the lock, or in the presence of the bit 18 of the appropriate key 2, introduced longitudinally into the slot 13 until its limit position in which it has, opposite each bore 71, a cavity 76 suitable for receiving a respective pin 63 by the end face 74 thereof, the pins 63 can occupy their release position, towards which they are pushed back by the cam effect of the cavities 73 on the ends 75 when the rotation of the rotor 5 is initiated relative to the stator 4. If, on the other hand, a bit 18 is not introduced into the slot 13 not having the cavities 76 in an appropriate position, or s if any tool inserted into the slot 13 is used to attempt to pick the lock, the pins 63 are brought to their safety position to prevent rotation of the rotor 5 relative to the stator 4 even if one has arrived, moreover, to bring the main pins 25 to their unlocking position and the pins 40 and 62

to their liberation position.

  It will be observed that it suffices for one of the pins 40, 62, 63 to remain in the safety position by the action of an inappropriate key bit or any tool on its end 48, 66, 74 facing inwards. of the slot 13 so that the rotor 5 remains immobilized relative to the stator 4, even if we have managed to bring all the main pins 25 to their unlocking position. The probability that all the pins 40, 62, 63 are authorized to reach their release position and that all the pins 25 are brought to their unlocking position by inserting, in the slot 13, the bit 18 of an inappropriate key or of any tool is extremely weak and it will be observed in particular that, insofar as bringing the main pins 25 from their locked position to their unlocked position involves the application of a thrust in this direction to their end 30, the probability is important that, for the purposes of applying this thrust, one is forced to bear on the end 48 of at least one of the pins 40 characteristic of the present invention in order to have an antagonistic support, which brings this pin 40 into its safety position. Thus, the implementation of the present invention results in increased security against picking, thanks to the characteristic positioning of the pins 40, independently of the fact that it may correspond to a significant increase in the number of filter pins if the 'We also keep the filter pins 62 and / or 63 known in the prior art, the presence of one or more pins 40 in accordance with the present invention being compatible with the conservation of these pins 62 and 63 known in

Prior Art.

Claims (10)

  1. Cylinder for security lock, of the type having a longitudinal axis (3) and comprising: - a longitudinal stator (4), having a longitudinal inner peripheral face (7), of revolution around the axis (3), - a longitudinal rotor (5) mounted inside the stator (4) and having a longitudinal outer peripheral face (11), of revolution about the axis (3), matching the inner peripheral face (7) of the stator (4 ) in a guiding relation to relative rotation about the axis (3), and a longitudinal interior slot (13) for removably receiving a bit (18) of the key (2) for operating the lock, said slot (13) being disposed along an axial mean plane (14) and having a determined cross section, - at least one removable locking assembly of the rotor (5) relative to the stator (4) in a determined relative orientation around the axis (3), said assembly comprising itself, according to the same mean plane transverse (43): a main radial pin (25) mounted to slide, in a main radial housing (26) of the rotor (5), arranged approximately along said axial mean plane (14), between a locking position in which it has a first end (30) projecting into the slot (13) and a second end (31) recessed relative to the outer peripheral face (11) and an unlocked position in which its first end (30) projects less in the slot (13) or is flush with it and its second end (31) is flush with the external peripheral face (11), * a radial piston (36) mounted to slide, in a radial housing (34) of the stator (4) , placed in the extension of the main housing (26) of the rotor (5) in said determined relative orientation, between a locking position in which it has a first end (37) projecting from the peripheral face i ntérieur (7) and an unlocking position in which its first end (37) is flush with the external peripheral face (11), * means (39) for elastic biasing of the piston (36), from its unlocking position to its position locking, so that, in said determined relative orientation, the piston (36) applies a thrust towards the axis to the main pin (25) and tends to bring the latter to its locking position by itself gaining its locked position and by engaging its first end (37) in the main housing (26) of the rotor (5), while the passage of the main pin (25) from its locked position to its unlocked position causes the passage of the piston (36) from its locking position to its unlocking position by releasing its first end (37) from the main housing (26) of the rotor (5), * at least one auxiliary pin (40) mounted for sliding in a transverse auxiliary housing (42) of the rotor (5), offset with respect to the main housing (26), between a safety position in which it has a first end (48) projecting into the slot (13) or flush with the latter and a second end (49) projecting from the outer peripheral face (11) and a release position in which its first end (48) projects more pronounced in the slot (13) and its second end (49) is flush with the outer peripheral face (11), so that the first end (48) of the auxiliary pin (40) in the safety position bears against the first end (30) of the main pin (25) in the position of locking and that the passage of the main pin (25) from its locking position to its unlocking position authorizes the passage of the auxiliary pin (40) from its safety position to its release position, * at least s a cavity (50) arranged in the inner peripheral face (7) of the stator (4) and placed in the extension of the auxiliary housing (42) of the rotor (5) in said determined relative orientation, so that in this- ci, the second end (49) of the auxiliary pin (40) engages in the cavity (50) in the safety position and that a rotation of the rotor (5) relative to the stator (4) from said orientation relative determined while the main pin (25) and the piston (36) occupy their unlocking position causes the auxiliary pin (40) to pass from its safety position to its release position by a cam effect applied by the cavity (50) at the second end (49) of the auxiliary pin (40), characterized in that the auxiliary housing (42) and the cavity (50) are arranged in a respective position approximately diametrically opposite, with reference to the axis (3), at the position the main housing (26) of the rotor (5) and in the position of the housing (34) of the stator (4), respectively.   2. Cylinder according to claim 1, characterized in that the auxiliary housing (42) is arranged laterally relative to the axial mean plane (14) of the   slot (13), approximately parallel to it.   3. Cylinder according to claim 2, characterized in that said assembly comprises two copies of the auxiliary housing (42), disposed respectively on either side of the axial mean plane (14) of the slot (13), and two corresponding copies of the auxiliary pin (40) and the cavity (50).   4. Cylinder according to any one of   claims 1 to 3, characterized in that said   assembly further comprises, along said transverse mean plane (43): at least one additional pin (62) mounted to slide in an additional transverse housing (64) of the rotor (5), arranged approximately perpendicular to the axial plane (14) of the slot (13), between a safety position in which it has a first end (66) projecting into the slot (13) or flush with the latter and a second end (67) projecting relative to the outer peripheral face (11) and a release position in which its first end (66) projects more pronounced into the slot (13) and its second end (67) is flush with the outer peripheral face (11), so that the first end (66) of the additional pin (62) in the safety position bears against the first end (30) of the main pin (25) in the locked position and that the passage of the pin prin cap (25) from its locking position to its unlocking position allows the additional pin (62) to pass from its safety position to its release position, - at least one additional cavity (68) arranged in the inner peripheral face (7) of the stator (4) and placed in the extension of the additional housing (64) of the rotor (5) in said determined relative orientation, so that, in the latter, the second end (67) of the additional pin (62) engages in the additional cavity (68) in the safety position and that a rotation of the rotor (5) relative to the stator (4) from said determined relative orientation while the main pin (25) and the piston (36) occupy their unlocking position causes the additional pin (62) to pass from its safety position to its release position by a cam effect applied by the cavity (68) at the second extr emited (67) from the additional pin (62).   5. Cylinder according to any one of   Claims 1 to 4, characterized in that it comprises at   at least one other removable rotor locking assembly (5) relative to the stator (4) in said determined relative orientation, said other assembly comprising itself, along the same other transverse mean plane (70), offset longitudinally with respect to said transverse mean plane (43): - at least one other pin (63) mounted to slide in another transverse housing (71) of the rotor (5), arranged approximately perpendicular to the mean plane (14) of the slot (13), between a position of safety in which it has a first end (74) projecting into the slot (13) or flush therewith and a second end (75) projecting relative to the outer peripheral face (11) and a release position in which its first end (74) protrudes more pronounced in the slot (13) and its second end (75) is flush with the outer peripheral face (11), - at least one other cavity (73) arranged in the inner peripheral face (7) of the stator (4) and placed in the extension of the other housing (71) of the rotor (5) in said determined relative orientation, so that, in the latter, the second end (75) of the other pin (63) engages in the other cavity (73) in the safety position and that a rotation of the rotor (5) relative to the stator (4) from said determined relative orientation while the main pin (25) and the piston (36) occupy their unlocking position causes the other pin (63) to pass from its safety position to its release position by a cam effect applied by the other cavity (73) at the second end (75) of the other pin (63).   6. Assembly consisting of a cylinder (1) according to   any one of claims 1 to 5 and a key   (2) intended to cooperate with such a cylinder (1) and comprising for this purpose a flat bit (18) shaped so as to be able to engage in a removable manner, by relative longitudinal translation, in the slot (13) of the rotor ( 5) by presenting a longitudinal axis (24) coincident with the longitudinal axis (3) of the cylinder (1) and an axial mean plane (21) coincident with the axial mean plane (14) of the slot (13), up to at a determined relative limit position, the bit (18) having for this purpose a section capable of integrating into said determined cross section of the slot (13), in a guide relation to relative longitudinal sliding, and defined by two faces main longitudinal (19,), respectively disposed on either side of the axial mean plane (21) of the bit (18), and by two longitudinal edges (22, 23), mutually connecting the main faces (19, 20) in overlapping the mean plane (21) of the bit (18), a first (23) of said edges (22, 23) having, along a transverse mean plane (51) which coincides with said transverse mean plane (43) in said limit position, an indentation such that, in said limit position and in said relative orientation, it is supported on the first end (30) of the main pin (25) for placing the main pin (25) and the piston (36) in the unlocked position, characterized in that the second (22) of said edges (22, 23) has the following same transverse mean plane (51) as said indentation of the first edge (23) a first cavity (52) such that, in said limit position and in said determined relative orientation, it offers at the first end (48) of the auxiliary pin ( 40) sufficient clearance to allow   passage of the latter to its release position.   7. An assembly according to claim 6, characterized in that, in the case of a cylinder (1) according to claim 2, said first cavity (52) also affects one (20) of the main faces (19, 20) bit (18) 8. An assembly according to claim 6, characterized in that, in the case of a cylinder according to claim 3, the second edge (22) has two copies of said first cavity (52), affecting respectively one and the other of the main faces (19, 20) of the bit (18).   9. An assembly according to any one of   Claims 6 to 8, characterized in that, in the case   of a cylinder (1) according to claim 4, at least one of the main faces (19, 20) has, along the same transverse mean plane (51) as said indentation of the first edge (23), at least a second cavity (69) such that, in the limit position and in said determined relative orientation, it offers at the first end (66) of the additional pin (62) a   sufficient clearance to allow passage of the latter to its release position.   10. Assembly according to any one of   claims 6 to 9, characterized in that, in the case   of a cylinder (1) according to claim 5, at least one of the main faces (19, 20) has, along another transverse mean plane which coincides with said other transverse mean plane (70) in said limit position, at at least a third cavity (76) such that, in the limit position and in said determined relative orientation, it offers sufficient clearance at the first end (74) of the other pin (63) to allow passage thereof his position of release.