FR2768454A1 - LOCK CYLINDER AND KEY FOR SUCH A CYLINDER - Google Patents

Abstract

Lock cylinder comprising a stator (1), an outer rotor (2) and an inner rotor (3) mounted in the stator, a bit (13) interposed between the outer rotor (2) and the inner rotor (3) and means for engaging the bit (13) with the outer rotor (2) or the inner rotor (3) when inserting a key into the corresponding rotor, characterized in that said clutch means comprise coded means (18, 20, 24, 25, 28) actuated by the key (1), for rotating the bit (13) with the inner rotor (3) and for rotating the bit with respect to the outer rotor (2) ) in the absence of a key in the outer rotor (2) and of rotation of the bit (13) with the outer rotor (2) and release of the bit from the inner rotor (3), during the introduction key in the outer rotor (2).

Description

i The present invention relates to cylinders of

  locks and relates more particularly to the improvement-

  tion of the safety of such cylinders with respect to the breakers

drilling and probing.

  Unauthorized opening of locks fitted with

  cylinders especially flat key cylinders is general-

  ment carried out after drilling operations on the rotor ex-

  the inside of the cylinder or the probing of the combination of pushers and pins which are normally pushed back and

  aligned when the key is inserted into the rotor

  respondent. Conventional cylinders therefore have two points of weakness which are difficult to remedy unless recourse is had to external security devices, such as rotating metal pellets or a hard alloy protecting the external rotor of the cylinder, which are however

  easily accessible and more expensive.

  When the cylinder combination is neutralized

  by probing, there is rotation of the outer rotor which normal-

ment causes the bit.

  As for drilling, it gives easy access to the

  and thus leads to the same result.

  The invention aims to erect obstacles to drilling and probing a lock cylinder which, without preventing

  their realization slows down their execution

tion.

  It therefore relates to a lock cylinder comprising

  taking a stator, an outer rotor and an inner rotor mounted in the stator, a bit interposed between the outer rotor and the inner rotor and means for engaging the bit with the outer rotor or the inner rotor when

  the introduction of a key into the corresponding rotor,

  characterized in that said clutch means comprise coded means actuable by the key, for securing

  rotating the bit with the inner rotor and

  lidarisation in rotation of the bit with respect to the rotor ex-

  in the absence of a key in the outer rotor and of

  integral in rotation of the bit with the external rotor

  of the bit from the internal rotor

  when inserting the key in the rotor ex-

térieur.

  According to particular characteristics of the

  vention, said clutch means comprise at least one axial pin for securing in rotation of the bit with the inner rotor of the cylinder, said at least one axial pin being mounted movable axially in the inner rotor and its end being engaged under the action of '' an elastic return member in a hole in the bit and at least one axial pusher for securing the bit with the outer rotor and for detaching the bit from the inner rotor, mounted in the outer rotor and actuable by the introduction of the key in

  the outer rotor to push the axial pin out of the

  inner tor against the elastic member out of the bit hole and replace it in it for

  secure the bit to the outer rotor.

  The invention also relates to a key for cy-

  key linder of the type defined above, characterized in that it comprises means intended to cooperate with the coded means for securing in rotation of the bit with the external rotor and for releasing the bit with respect to the internal rotor during introduction of the key in the

outer rotor.

  According to a particular characteristic, the key comprises at least one axial recess formed in the end of its rod, said axial recess being intended to cooperate by its bottom with a corresponding pusher mounted in the external rotor to move said pusher axially during

  the introduction of the key into said outer rotor.

  The invention will be better understood using the

  description which follows, given solely by way of example and made with reference to the appended drawings, in which: - Fig.l is an exploded perspective view in section of a flat key cylinder according to the invention; - Fig.2 is a partial sectional view on a larger scale of the rotors and the bit of the cylinder of Figure 1 in the absence of a key in the outer rotor; - Fig.3 is a partial sectional view similar to that of Figure 2, of the rotors of the cylinder bit

  according to the invention, in the presence of a key in the rotor ex-

  lower; and - Fig.4 is a partial sectional view showing

  a variant of the arrangement of FIGS. 2 and 3.

  The cylinder shown in Figure 1 has a

  body 1, for example made of brass, in which are mounted

  tation a first rotor 2 which will be considered as the rota-

  tor outside of the cylinder and intended to be mounted outside

  laughter of a door fitted with such a cylinder and a second ro-

  tor 3 which will be considered as the inner rotor.

  Opposite the locations for the exterior and interior rotors 2 and 3, the body 1 comprises a series of parallel channels 4 for sets of pins 5, pushers 6,

  springs 7 and plugs 8 which define ma-

  classic way the combination corresponding to the cutout 9 provided on the corresponding edge of the rod 10 of the key

11 for actuating said cylinder.

  Between the two rotors 2 and 3, the stator 1 comprises

  a notch 12 in which is engaged a bit 13.

  Circlips 14 are intended to secure the immobili-

  axial position of the rotors 2 and 3 relative to the stator 1, by engagement in corresponding grooves 15 of said rotors and by abutment against the interior walls of the notch

  12 as shown in particular in FIGS. 2 and 3.

  In the outer rotor 2 are formed axial channels 16, while in the bit 13 are formed the

  corresponding holes 17 whose role will be explained below

  tail with reference to Figures 2 and 3.

  In Figure 2, there is shown in cross section

  dirty, the cylinder of Figure 1 whose various elements occupy the positions determined by the absence of a key

  introduced into the outer rotor 2.

  In the axial channels 16 formed in the rotor ex-

  térieur 2, on either side of the key passage 2a of this ro-

  tor, are arranged axial pushers 18 in each of-

  which is provided with an axial lateral recess 19.

  In each recess 19, a side finger is engaged.

  ral 20 protruding into the key passage 2a for cooperation

  rer with the bottom of a corresponding axial recess 21 mena-

  ge in the corresponding face of the end of the rod 10 of the key 11 to move the corresponding pusher 18 axially. In the inner rotor 3 are provided on either side of the key passage 3a axial passages 23 whose

  axes are aligned with the axes of the axial channels 16 of the ro-

  external tor 2 and in which pins are mounted

  24 having shoulder ends 25 of corresponding diameter

  laying on the diameter of the holes 17 made in the bit 13 in which the corresponding ends of the

  exterior 2 and interior 3 rotors.

  The length of the shouldered ends 25 of the pins 24 is equal to the thickness of the web 26 of the bit 13 in

which are provided the holes 17.

  Between the pins 24 and the bottoms of the axial passages 23 of the inner rotor 3, springs are interposed

  28 applying the pins 24 against the web 26 of the pan

neton 13.

  The shoulder ends 25 of the axial pins 24,

  have a section corresponding to that of the 18 mm pushers

  tees movable in the outer rotor 2.

  It can therefore be seen in FIG. 2 that in the absence of a key

  in the outer rotor 2, the axial pins 24 biased

  tees by the springs 28, are applied against the web 26 of the bit 13 and their shoulder ends 25 are engaged in the holes 17 of this bit and push the pushers 18 of the outer rotor 2 in a position in which their ends close to the bit are flush with the area

  corresponding to the veil 26 thereof, so that the ro-

  outer tor 2 is in the disengaged position with respect to

bit 13.

  The introduction of the key 10 into the outer rotor 2 causes, as shown in FIG. 3, the axial displacement of the pushers 18 in the direction of the bit 13, under the action of the recesses 21 formed at the end of the key, which cooperate with the fingers 20 for actuating the

push buttons 18.

  The ends of the pushers 18 when entering

  the holes 17 made in the web 26 of the bit 13, re-

  push the shouldered ends 25 of the axial pins 24 of the inner rotor 3, against the action of the springs 28 to cause said shouldered ends 25 to be flush

  the corresponding surface of the web 26 of the bit 13 and li-

  so berate the inner rotor 3 relative thereto.

  Simultaneously, this action causes the solidarisa-

  tion in rotation of the outer rotor 2 with the bit 13.

  In the example which has just been described, the rotor ex-

  2 has two pushers 18 associated with two gou-

  axial pins 24 mounted in the inner rotor 3 as well as two holes 17 formed in the bit 13 and intended to receive either the ends 25 of the pins 24, or the

ends of pushers 18.

  Of course, the number of pushers and associated axial pins may be different, in particular depending

  of the rotor and bit section.

  In addition, in the example described, the axial pushers 18 each have a recess 19 in which is

  engaged a finger 20 for actuating the pushers.

  According to a variant not shown, the pushers and the fingers are produced in a single piece by providing on each pushrod a projecting lateral axial shoulder, cooperating with a corresponding axial recess 19 of the key.

  Thanks to the arrangement which has just been described, the cy-

  lindre according to the invention comprises besides the combination

  classic pins and pushers cooperating with the de-

  longitudinal section of the key edge, a combination

  additional formed by the pushers 18 of the outer rotor

  laughing actuated by axial recesses 21 formed in the ex-

  end of the key, the depths of which can vary

  bles to form a coded combination, said pushers 18, when they are pushed back by the axial pins 24 of the inner rotor 3 not being engaged with the bit

  13, so that the outer rotor 2 is disengaged with respect to

port audit bit 13.

  Thus, even if by probing, it is possible to determine the conventional combination of the key, the bit 13 cannot be effectively driven in rotation unless the code formed by the pushers 18 and the axial recesses 21 of the key is also found. corresponding, otherwise, the outer rotor 2 will be separated in rotation

  with respect to bit 13, and cannot drive it.

  Note as shown in Figure 4, that the

  veil 26a of the bit 13 may advantageously have dif-

  different thicknesses opposite the different pins 24a, 24b of the inner cylinder 3, the shoulders shouldered

  a, 25b of these pins then also having long

  different sizes adapted to the corresponding thicknesses

veil.

  Similarly, the depth of the axial recesses 21 of the key and the corresponding axial position of the projection formed by each lateral finger 20 or by the shoulder whose

  is provided with each pusher 18, can be variable. We increase

  thus lies the number of possible coding combinations.

  Furthermore, the axial pushers 18 mounted displaced

  cables in the outer rotor 2, are made of steel

  hard enough to constitute significant obstacles

  damage to the outer rotor, making it even more difficult

  fictitious the breaking of such a cylinder.

  Finally, only a special key with recesses

  elements provided at the end of its rod and cooperating with the pushers of the outer rotor can be used to ensure

  actuation of the cylinder according to the invention.

Claims (10)

  1. Lock cylinder comprising a stator (1), an outer rotor (2) and an inner rotor (3) mounted in the stator, a bit (13) interposed between the outer rotor (2) and the inner rotor (3) and clutch means of the   bit (13) with the outer rotor (2) or the inner rotor   laughing (3) when inserting a key into the rotor   corresponding, characterized in that said means of em-   clutch comprise coded means (18,20,24,25; 18,20,24a,   25a, 24b, 25b), actuable by the key (11), of solidarisa-   tion in rotation of the bit (13) with the inner rotor (3) and of separation in rotation of the bit opposite   of the outer rotor (2) in the absence of a key in the rotor ex-   térieur (2) and securing in rotation of the bit   (13) with the external rotor (2) and for releasing the fault -   tone with respect to the inner rotor (3), when introducing   tion of the key (11) in the outer rotor (2).   2. Lock cylinder according to claim 1, characterized in that said clutch means comprise   at least one axial pin (24,25; 24a, 25a, 24a, 24b) of so-   rotation of the bit (13) with the rotor   inside (3) of the cylinder, said at least one axial pin (24,25; 24a, 25a, 24b, 25b) being mounted axially displaceable in the inner rotor (3) and its end (25,25a, 25b) being engaged under the action of an elastic return member (28) in a hole (17) formed in the bit (13) and at least one axial pusher (18) for securing the bit (13) with the external rotor (2) and for separating the bit from the inner rotor (3), mounted in the outer rotor (2) and actuable by the introduction of the   key (11) in the outer rotor (3) to push back the gou-   axial pile (24,25; 24a, 25a, 24b, 25b) of the inner rotor (3) against the elastic member (28) out of the hole (17) of the bit (13) and replace it in this one for   secure the bit (13) with the outer rotor (2).   3. Lock cylinder according to claim 2, characterized in that each axial pin (24; 24a, 24b) mounted in the inner rotor (3) has a stepped end (25; 25a, 25b) of diameter corresponding to the diameter of the hole   (17) corresponding provided in the bit (13).   4. Lock cylinder according to one of the claims   tions 2 and 3, characterized in that each pusher (18) mounted in the outer rotor (2) has a recess   axial (19) in which a lateral finger (20) is mounted   tiné to cooperate with the bottom of a corresponding axial recess (21) formed in the end of the rod (10) of the key (11)   for axially moving the corresponding pusher (18).   5. Lock cylinder according to claim 4, characterized in that the external rotor (2) comprises at least one pusher disposed on each side of the passage (2a) for the key rod (10), its lateral finger (20) making protrusion in said passage (2a) in order to be able to come into   contact with the bottom of the corresponding recess (21)   ge in the end of the rod (10) of the key (11).   6. Lock cylinder according to any one of   Claims 2 and 3, characterized in that each pusher   (18) mounted in the outer rotor (2) has a shoulder   protruding side finger forming intended to cooperate   with the bottom of a corresponding axial lateral recess (21)   swam in the end of the rod (10) of the key (11) to   move the corresponding pusher (18) axially.   7. Lock cylinder according to any one of   Claims 2 to 6, characterized in that the bit (13)   has different thicknesses opposite the different pins (24a, 24b) whose shoulder ends (25a, 25b) also have different lengths adapted to   corresponding thicknesses of the bit.   8. Key for lock cylinder according to one of   Claims 1 to 7, characterized in that it comprises   means (21) intended to cooperate with the coded means (18,20,24,25; 18,20,24a, 25a, 24b, 25b) for rotationally securing the bit (13) with the external rotor (2) and release of the bit relative to the inner rotor (3)   when the key (11) is inserted into the external rotor   laughing. 9. Key according to claim 8, characterized in that it comprises at least one axial recess (21) formed in the end of its rod (10), said axial recess (21) being intended to cooperate by its bottom with a corresponding pusher (18,20) mounted in the outer rotor (2) for axially displacing said pusher when the key is inserted into said outer rotor (2). 10. Key according to claim 9, characterized in that it comprises at least one axial recess (21) formed in each of the faces of its rod (10) and intended to cooperate   with a corresponding pusher (18,20), arranged in the ro-   outside tor on the corresponding side of the key passage (2a) of said outer rotor.