EP0769597B1 - Lock of the disengageable rotor type - Google Patents

Description

The present invention relates to a lock of the type disengageable rotor.

The invention relates more particularly to a lock intended to be used for the control of a lock fitted to a motor vehicle allowing by example the locking of a window of the vehicle such as a door.

Among the various modes of break-in aimed at breaking in in a vehicle by opening a door, the main consist in acting on the lock, in particular by means of a wrong key.

In order to counter such acts, it has already been proposed many designs of rotor type locks disengageable which prevent any positive action on the lock mechanism as long as a compliant key is not inserted in the lock.

These different designs of a rotor lock disengageable are of the type comprising a mounted rotor swiveling in an intermediate stator in the form of a socket itself pivotally mounted in a fixed lock body, locking members such as glitter or couples pistons cooperating with the rotor and the intermediate stator to secure them in rotation in the absence of a key or presence of a non-conforming key, and to release the rotor by rotation relative to the intermediate stator after introduction of a conforming key, and of the type comprising a member angular indexing of the intermediate stator relative to the fixed body which is mounted movable between an indexing position in which it is recalled elastically and in which it is received in a notch of the fixed body, and a position retracted in which it is erased, against an effort elastic return.

According to a known concept, the indexing member is for example made in the form of an arm arranged in a longitudinal housing formed in the peripheral wall of the intermediate stator, the arm having on its radial face external a projection which, in the indexing position, is received radially in a longitudinal groove formed in the inner wall of the fixed lock body so as to make the intermediate stator integral in rotation with the fixed body, in the absence of a key or in the presence of a conforming key.

A disengageable mechanism has also been proposed for controlling a lock, in particular fitted to an opening of a motor vehicle, of the type comprising a rotor lock disengageable as described in document FR-A-2,642,463.

All of these known designs of rotor locks disengageable are not entirely satisfactory, in particular insofar as it is possible to act fraudulently directly on the output device, especially after a thief returned the assembly constituted by the stator intermediate and the idler rotor rotating relative to the body fixed lock, by means of a false key.

In order to solve this problem, document DE-C-4.410.783 which corresponds to the preamble of claim 1, described and shows a rotor type lock disengageable comprising a rotor mounted journalled in a socket-shaped intermediate stator itself mounted pivoting in a lock body, locking members such as flakes or pairs of cooperating pistons with the rotor and the intermediate stator to secure them in rotation in the absence of a conforming key, and to release the rotor rotating relative to the intermediate stator after introduction of a compliant key, of the type comprising a member angular indexing of the intermediate stator relative to the fixed body which is mounted movable between an indexing position in which it is recalled elastically and in which it is received in a notch of the fixed body, and a position retracted in which it is erased at least in part to against an elastic return effort, the indexing device being offset and mounted axially movable between its positions indexing and retracted, the lock comprising a outlet rotatably mounted relative to the fixed latch body and which is linked in rotation to the rotor by disengageable means drive whose declutching is caused by the organ indexing the intermediate stator when in position retracted, of the type in which the angular indexing member immobilizes the output member in rotation relative to the body fixed lock when in the retracted position, and of the type in which the angular indexing member is mounted sliding axially in an axial notch of the fixed body and the intermediate stator has an indexing notch.

The object of the invention is to have a lock of this type of a simple and economical design.

To this end, the invention proposes a lock of the type mentioned above, characterized in that the notch axial is located in the disc-shaped radial flank annular pierced in its center which closes the axial end of the lock, and in that it opens axially at its two ends ends, on the one hand towards the rear opposite a track annular transverse of the intermediate stator comprising the indexing notch in which the indexing member is received partially, in the indexing position, and secondly, towards the front, opposite a disc-shaped transverse part of the outlet member which has an axial slot opening out at its two ends in which the indexing member is partially received, in the retracted position, to immobilize directly the outlet member with respect to the fixed body of bolt, and which opens axially towards the front opposite a axial extension of the front end of the rotor which comprises an axial cavity opening at its rear axial end and in which a key is mounted axially movable between a training position towards which it is requested elastically towards the rear and in which the key is partially received inside the slot of the outlet member and a declutching position in which the key is axially retracted inward into the rotor cavity.

• l'organe d'indexation est un organe de révolution et le cran d'indexation présente un profil de came en forme de V inversé susceptible de provoquer l'escamotage, axialement vers l'avant, de l'organe d'indexation lorsque le stator intermédiaire est entraíné en rotation par rapport au corps fixe ;
• l'organe d'indexation est une bille sphérique ;
• un ressort de rappel est interposé entre la clavette et le fond de la cavité du rotor pour solliciter la clavette axialement vers l'arrière ;
• en position de repos du verrou, la clavette, sous l'action du ressort de rappel, sollicite l'organe d'indexation axialement vers l'arrière vers sa position d'indexation dans laquelle il est reçu dans le cran d'indexation ;
• la clavette est un coulisseau monté coulissant axialement dans la cavité du rotor et une extrémité libre du coulisseau est reçue en partie dans la fente de l'organe de sortie pour l'entraínement en rotation de l'organe de sortie par le rotor ;
• le rotor comporte un embout avant de rotor rapporté sur le corps principal arrière du rotor, l'organe de sortie est une plaque transversale agencée axialement entre le corps et l'embout du rotor, et la cavité axiale qui reçoit la clavette est formée dans la face transversale d'extrémité arrière de l'embout de rotor ;
• le coulisseau comporte une queue d'orientation radiale vers l'intérieur qui est reçue en coulissement dans une rainure axiale complémentaire agencée dans le stator intermédiaire et alignée axialement avec le cran d'indexation ;
• la rainure complémentaire est formée dans un tronçon d'extrémité axiale du stator intermédiaire qui s'étend axialement vers l'avant au-delà de ladite piste transversale annulaire du stator intermédiaire.

According to other characteristics of the invention:

• the indexing member is a member of revolution and the indexing notch has an inverted V-shaped cam profile capable of causing the indexing member to retract, axially forward, when the stator intermediate is rotated relative to the fixed body;
• the indexing device is a spherical ball;
• a return spring is interposed between the key and the bottom of the cavity of the rotor to bias the key axially rearward;
• in the latch rest position, the key, under the action of the return spring, biases the indexing member axially towards the rear towards its indexing position in which it is received in the indexing notch;
• the key is a slider mounted to slide axially in the cavity of the rotor and a free end of the slider is partly received in the slot of the output member for the rotational drive of the output member by the rotor;
• the rotor has a front rotor end piece attached to the rear main body of the rotor, the output member is a transverse plate arranged axially between the body and the end piece of the rotor, and the axial cavity which receives the key is formed in the transverse rear end face of the rotor tip;
• the slide comprises a tail of radial orientation towards the inside which is received in sliding in a complementary axial groove arranged in the intermediate stator and axially aligned with the indexing notch;
• the complementary groove is formed in an axial end section of the intermediate stator which extends axially forwards beyond said annular transverse track of the intermediate stator.

• la figure 1 est une vue en perspective éclatée qui illustre les principaux composants d'un verrou d'ouvrant de véhicule automobile réalisé conformément aux enseignements de l'invention ;
• la figure 2 est une vue en perspective à plus grande échelle du stator intermédiaire du verrou ;
• la figure 3 est une vue en perspective qui illustre certains des composants du verrou en position assemblée et dont une partie est arrachée par section selon un plan parallèle à l'axe du verrou et passant par le plan médian de coulissement axial du coulisseau, correspondant à la ligne de section 7-7 de la figure 6 ;
• la figure 4 est une vue en perspective en section axiale partielle qui illustre le verrou en position assemblée de ses composants et en position de repos du verrou ;
• la figure 5 est une vue similaire à celle de la figure 4 sur laquelle le verrou est illustré en position débrayée du rotor avec une rotation de 180° de ce dernier par rapport à sa position de repos de la figure 4 ;
• la figure 6 est une vue partielle en section par un plan axial du verrou dont les composants sont dans la position illustrée à la figure 3 ;
• la figure 7 est une vue de détail en section selon la ligne 7-7 de la figure 6 ; et
• les figures 8 et 9 sont des vues similaires à celles des figures 6 et 7 qui illustrent les composants du verrou dans la position représentée à la figure 5.

Other characteristics and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which:

• Figure 1 is an exploded perspective view which illustrates the main components of a motor vehicle window lock produced in accordance with the teachings of the invention;
• Figure 2 is a perspective view on a larger scale of the intermediate stator of the lock;
• FIG. 3 is a perspective view which illustrates some of the components of the lock in the assembled position and part of which is cut away in section along a plane parallel to the axis of the lock and passing through the median plane of axial sliding of the slide, corresponding to the section line 7-7 of Figure 6;
• Figure 4 is a perspective view in partial axial section which illustrates the lock in the assembled position of its components and in the rest position of the lock;
• Figure 5 is a view similar to that of Figure 4 in which the lock is illustrated in the disengaged position of the rotor with a rotation of 180 ° of the latter relative to its rest position of Figure 4;
• Figure 6 is a partial sectional view through an axial plane of the latch, the components of which are in the position illustrated in Figure 3;
• Figure 7 is a detail view in section along line 7-7 of Figure 6; and
• FIGS. 8 and 9 are views similar to those of FIGS. 6 and 7 which illustrate the components of the lock in the position shown in FIG. 5.

The lock 10 illustrated in the figures is formed to essentially by a main lock body 12 forming a stator fixed intended for example to be mounted in a housing lock or directly into a door housing vehicle, an intermediate stator 14, a rotor 16 and by a output member 18 intended to be connected to a mechanism for lock control (not shown).

As can be seen in the figures, the body of lock 12 is essentially made up of a jacket external cylindrical annular 20 open at its axial end rear 22, by convention on the right considering the figures, and closed at its front axial end by a radial flank in shape of an annular disc delimiting a bottom 24 pierced in sound center by a circular hole 26. The bottom 24 has a notch 28 which opens axially on either side of the bottom transverse 24 and which is open radially inwards in hole 26.

The notch 28 is a notch with radial edges parallels likely to receive in axial sliding a indexing member constituted by a spherical ball 30.

The intermediate stator 14 is in the form general of a cylindrical sleeve 32 whose surface convex external cylindrical 34 is intended to be received at rotation in the concave internal cylindrical wall 36 of the socket 20 forming fixed lock body 12.

The tubular cylindrical sleeve 32 is delimited axially by an annular rear end face 38 and by a front end annular transverse surface 40 which, in components mounted position, is in axial support against the front transverse bottom 24 of the lock body 12.

The annular transverse surface 40 has a notch indexing 42 produced in the form of a cam profile substantially inverted V-shaped that extends axially backwards and is likely to receive at least partially the indexing ball 30.

The tubular sleeve 34 of the intermediate stator 14 is extends axially forward beyond the runway annular transverse 40 by a front end section 44 whose diameter is such that it rotates through hole 26 of the front transverse bottom 24 of the lock body 12.

An inner radial groove 46 is formed in the peripheral cylindrical surface 48 of the end section 44, substantially mid-length of the latter.

An axial groove 50 is also formed in the cylindrical surface 48 and it extends axially from the face annular end 52 of section 44 to the radial groove 46 into which it leads.

The axial groove 50 is angularly aligned with the indexing notch forming a cam 42.

The sleeve 34 internally delimits a bore of large diameter 54 (Figures 3 and 4) open axially towards the rear to receive the rear main body 56 of the rotor 16 and it extends forward by a bore of reduced diameter 58 formed through the front end section 44 intended for receiving a front end tail 60 of the rotor 16.

According to a known design, the body 56 of the rotor 16 is a barrel in which sequins 59 are mounted which are received radially in housings 62 in which they can be retracted radially inwards, in presence of a compliant key.

The entire body 56 and the glitter 59 is mounted axially and rotationally in the tubular sleeve 34 of the intermediate stator 14 and in the mounted position, the annular face 64 of the rotor 16 is in axial abutment against the annular faces rear end 22 and 38 of the lock body 12 and the stator intermediate 14.

The axial length of the front end tail 60 is substantially equal to the length of the front extension 44 and it protrudes beyond the latter by a section section rectangular 66.

The output member 18 of the lock, which is also called the thresher of the lock mechanism which is associated with the lock, consists of a shaped element plate general comprising a central part 68 in the form of annular disc which extends radially towards the outside by a transverse arm 70.

The disc-shaped central part 68 is drilled in its center by a circular hole 72 of the same diameter as the hole 26 of the transverse bottom 24 of the lock body 12 of so as to allow axial passage and rotation of the section front end 44 of the intermediate stator 14 which extends axially, in the mounted position, through the threshing machine 18 beyond of the front face 74 of the latter while its face rear 76 is in axial abutment against the annular face front end 24 of the lock body 12.

The central part 68 of the thresher has a slot axial through hole 78 which runs right through it and which is open radially inward in the wall of hole 72.

Slot 78 is a slot with parallel edges which are spaced transversely from each other to allow the axial sliding of the indexing ball 30 inside the slot 78.

The axial depth of the indexing notch 42 forming cam and the diameter of the indexing ball 30 are such that, in the indexed position of the ball 30, and as we can see in particular in Figures 6 and 7, it is received in axial support in the bottom of the notch 42 and in the notch 28 but it does not does not extend axially forward, i.e. to the left considering Figures 6 and 7, beyond the annular face front end 25 of the transverse bottom 24 and therefore does not protruding axially in the slot 78.

The rotor 16 is made in two parts, the second of which consists of a front end 80 in the general form of cylindrical pot delimited by a cylindrical annular skirt 82 and by a front transverse bottom 84 pierced by a hole rectangular section 86 complementary to the section of the end 66 of the rear main body 56 of the rotor 16 and used to angularly orient the tip 80 relative to the body 56.

The skirt 82 is delimited axially towards the rear by a rear end annular surface 88 which is in abutment axial against the front face 74 of the central part 68 of the thresher 18.

The skirt 82 defines an internal cylindrical housing 90 in which the front end section 44 is received in rotation of the intermediate stator 14.

The rotor tip 80 is linked in rotation to the part rear 56, 60 of the rotor 16 and it is fixed axially by means (not shown) arranged for example in the form of an elastic ring received in the free end of the square 66 so that all of the components are retained axially with respect to others in the mounted position.

The rotor tip 80 has a cavity 92 axial orientation which opens into the end face rear 88 of the skirt 82 of the end piece 80 and which is delimited axially forward by a bottom 94.

In accordance with the teachings of the invention, a key 100 is received in sliding at least partially inside the axial cavity 92.

The key 100 is here produced in the form of a slide 102 of rectangular section complementary to the cross section of the cavity 92 and which is stressed axially from front to back, i.e. from left to right considering the figures, by a helical spring of compression 96 which bears against the bottom 94 of the cavity 92 and against the axial face opposite the slider forming key 102.

As can be seen in the figures, and in particular on FIG. 6, the radial thickness of the slide 102 separating its lower 104 and upper 106 east orientation faces slightly less than the radial distance between the bottom of the notch 28 and the bottom of the slot 78 (which are aligned) of the peripheral cylindrical surface 45 of the front extension 44 of the intermediate stator 14.

The radial thickness of the slide 102 thus corresponds substantially to the diameter of the indexing ball 30.

In its rest position illustrated in particular in Figures 3 and 6, the slide 102 is biased axially in support against the indexing ball 30 against which it is axial support by its rear transverse face 110 which is located in the same plane as that of the rear face 76 of the thresher 18, the slide 102 being thus received simultaneously in the slot 78 and in the cavity 92 to immobilize in rotation of the thresher 18 relative to the rotor 16, 80.

The slide 102 comprises, on its lower face 104, a tail 114 radially inwardly extending here to the right of the internal radial groove 46 formed in the extension 44 of the intermediate stator 14 in which it is received radially and whose dimension is such that it allows to slide in the groove 46 as well as in the groove axial 50 as will be explained later.

We will now describe the function mode of the lock according to the invention with particular reference to Figures 4 to 9.

In the rest position of the lock illustrated in the figure 4, all the components are angularly indexed in this rest position and, due to the introduction of a key conform (not shown), the flakes 59 are retracted radially.

Thus, the rotor 16, 56 is not linked in rotation to the stator intermediate 14, 44 and it is free to rotate relative to this one.

Due to the axial position of the slide forming key 102, illustrated in FIGS. 4, 6 and 7 in which it extends simultaneously into the cavity 92 and into the slot 78 of the thresher 18, the latter is linked in rotation to the end piece before 80 of rotor 16 and therefore to the latter.

Rotation of rotor 16 using a conforming key therefore causes simultaneous rotation of the nozzle 80 and the threshing machine 18 which slides in rotation between the faces annulars opposite 88 and 25.

The intermediate stator 14, 44 is immobilized in rotation relative to the fixed latch body 12 via the indexing ball 30 which is received axially simultaneously in the indexing groove 42 and in the notch 28 formed in the transverse bottom 24 of the lock body 12.

The rotor 16, 80 therefore drives the slide 102 and the threshing machine 18 in rotation relative to the lock body 12, the tail 114 of slider 102 being slidably received in the groove 46 formed in the front extension 44 of the intermediate stator 14.

It is therefore the key 100.102 constituting means disengageable drive which directly secures the thresher 18 with the rotor 16.

In case of introduction, with a view to an attempt break-in, non-compliant key and as illustrated in FIGS. 5, 8 and 9, the flakes 59, illustrated so schematic in Figures 5 and 8, secure in rotation the body 56 of rotor 16 and therefore the latter with the sleeve cylindrical 34 of the intermediate stator 14.

The start of rotation, using a false key, of the stator intermediate with the rotor 16 causes an axial retraction from back to front, i.e. from right to left in considering the figures, of the indexing ball 30 which, because of the inverted V-shaped cam profile of the indexing notch 42, leaves the latter axially to occupy its position retracted axial illustrated in Figures 5, 8 and 9 in which it is in axial abutment against the annular transverse track 40 and in which it is received simultaneously in the notch 28 of the transverse bottom 24 of the fixed latch body 12 and in the slot 78 of the central part 68 of the thresher 18.

The indexing ball 30 thus immobilizes directly in rotation of the threshing machine 18 relative to the fixed lock body 12.

During its axial retraction movement from rear to before, the ball 30 caused the simultaneous sliding of the slide forming key 102, from right to left in starting from figure 6 so that it is fully retracted, against the restoring effort exerted by the spring 96 in the cavity 92, its transverse face rear end 110 then being in axial abutment against the face front 74 of the central part 68 of the thresher 18.

Due to the alignment of the axial groove 50 with the indexing groove 42, the tail 114 of the slide 102 could penetrate the axial groove 50 to allow the axial retraction movement of the keyway slide 102 inside the cavity 92.

There is no longer any connection in rotation between the threshing machine 18 and the rotor 16, 56, 60, the latter driving in rotation, but without any other functional effect, the stator intermediate 14.

Furthermore, the thresher 18 is itself immobilized in rotation relative to the lock body 12 by through the indexing ball 30.

In the case of a non-compliant key, the means disengageable drive 100,102 are therefore retracted and the only action against the thresher 18 is fulfilled by the indexing unit 30.

If the rotation is continued with the non-conforming key and at each angular passage of the indexing catch 42 and the slide 102 opposite the notch 28 and the ball 30, that is to say in the respective angular position of the components corresponding to the rest position of the lock, the ball 30 comes back to occupy its indexing position in which it is received in notch 42 to reindex all components of the lock in one position of use.

After an attempted break-in using a non-key compliant, and if the components are not in position angularly reindexed, the introduction of the conforming key the user of the vehicle will cause the radial erasure towards inside the flakes 60, the intermediate stator 14, 44 then no longer made integral in rotation with the rotor except by through the tail 114 of the slide 102 received in the axial reindexing groove 50.

Rotation of the rotor using a conforming key will therefore allow to drive the intermediate stator 14, 44, by through the tail 114 of the slide 102 to the reindexing the mechanism in the rest position of the lock illustrated in particular in FIGS. 4 and 6.

In case of ordinary maneuvering difficulty, such as example in case of frost, we see that the design of the bolt allows a great effort to be exerted on the threshing machine 18, using a compliant key, without presenting any risk of inadvertent release of the lock.

In the event of an assault attempt to open fraudulently the door in which a thief attempts act directly or indirectly on the output thresher 18, from the rest position illustrated in FIGS. 4 and 6, it can cause the slight rotation of a few degrees of the threshing machine 18 which then drives the rotor 16 via the slide forming key 102 and therefore it causes a simultaneous rotation of the intermediate stator 14 which is linked to the rotor 16 by the flakes 59 and therefore a disengagement of the mechanism because the indexing ball 30 is pushed back axially forward by the cam profile of the groove indexing 42 and it also immediately blocks in rotation of the thresher 18 relative to the fixed body 12 due to the presence of the ball 30 simultaneously in the notch 28 and in slot 78.

The thief cannot therefore cause the rotation of the threshing machine 18, beyond an initial stroke of a few degrees, and therefore cannot activate the lock connected to the thresher 18.

According to an alternative embodiment not shown on the figures, it is possible to replace the slide 102 by a simple spherical ball of appropriate dimensions resulting in the same operating principle of the lock but without this one offering a reindexing capacity automatic as explained above.

Claims (9)

1. A lock (10) of the type having a releasable rotor (16) comprising a rotor mounted for rotation within an intermediate stator (14) in the form of a sleeve (34), which is itself mounted pivotally within a lock body (12), locking members (59) such as pallets or pairs of pistons cooperating with the rotor (16) and the intermediate stator (14) so as to couple them for rotation together in the absence of a correct key, and so as to release the rotor (16) for rotation with respect to the intermediate stator (14) after introduction of a correct key, of the type comprising a member (30) for the angular indexing of the intermediate stator (14) with respect to the fixed body, the indexing member being mounted for movement between an indexing position in which it is elastically biased and in which it is received in a notch in the fixed body, and a retracted position in which it is at least partly withdrawn against an elastic return force, the indexing member (30) being eccentric and mounted for axial movement between its indexing and retracted positions, the lock (10) including an output member (18) which is rotatable with respect to the fixed lock body and which is coupled in rotation to the rotor (16) by disengageable drive means (100, 102), disengagement of which is caused by the indexing member (30) associated with the intermediate stator (14) when in the retracted position, of the type in which the angular indexing member (30) immobilises the output member (18) against rotation with respect to the fixed lock body (12) when in the retracted position, and of the type in which the angular indexing member (30) is mounted for axial sliding movement in an axial notch (28) of the fixed body (12, 24), and the intermediate stator includes an indexing notch (42), characterised in that the axial notch (28) is situated in the radial flank, in the form of an annular disc having a central through hole, which closes the axial end of the lock, and in that the axial notch is open axially at its two ends, firstly towards the rear, facing an annular transverse portion (40) of the intermediate stator (14, 34, 44) which includes the indexing notch (42) in which the indexing member (30) is partially received when in the indexing position, and secondly forward facing a disc-shaped transverse portion (68) of the output member (18) which includes an axial slot (78) open at its two ends, in which the indexing member (30) is partially received in the retracted position, whereby directly to immobilise the output member with respect to the fixed lock body, and the open front end of the axial slot faces towards a member (80) which constitutes a terminal forward axial extension of the rotor (16) and which has an axial cavity (92) open at its rear axial end, and in which a key-piece (100) is mounted for axial movement between a drive position, towards which it is elastically biased rearwardly and in which the key-piece is partly received within the slot (78) of the output member, and a disengagement position in which the key-piece (100) is retracted axially inwards into the cavity (92) of the rotor (16, 80).
2. A lock according to Claim 1, characterised in that the indexing member (30) is an organ of revolution, and in that the indexing notch (42) has a cam profile in the form of an inverted V adapted to cause the axial forward retraction of the indexing member (30) when the intermediate stator (14) is driven in rotation with respect to the fixed body (12).
3. A lock according to Claim 2, characterised in that the indexing member is a spherical ball (30).
4. A lock according to Claim 3, characterised in that a return spring (96) is interposed between the keypiece (100) and the base (94) of the cavity (92) of the rotor, so as to bias the key piece (100) axially backward.
5. A lock according to any one of Claims 1 to 3, characterised in that, in the rest position of the lock (10), the keypiece (100), under the action of the return spring (96), urges the indexing member (30) axially backward towards its indexing position in which it is received in the indexing notch (42).
6. A lock according to any one of Claims 1 to 5, characterised in that the key piece is a slider (102) which is mounted for axial sliding movement in the cavity (92) of the rotor (16, 80), and in that a free end of the slider is partly received in the slot (78) of the output member (18) whereby the output member is driven in rotation by the rotor.
7. A lock according to any one of Claims 1 to 6, characterised in that the rotor has a front rotor end member attached on the rear main body of the rotor, in that the output member is a transverse plate (68) disposed axially between the body (56) and the end member (80) of the rotor (16), and in that the axial cavity (92) that receives the key-piece (100) is formed in the rear transverse end face (88) of the end member (80) of the rotor (16).
8. A lock according to Claim 6, characterised in that the slider has a radially inwardly oriented tail (114) which is received for sliding movement in a complementary axial groove (50) formed in the intermediate stator (14, 44) and aligned axially with the indexing notch (42).
9. A lock according to Claim 8, characterised in that the complementary groove (50) is formed in an axial end portion (44) of the intermediate stator (14) which extends axially forward from the said annular transverse portion (40) of the intermediate stator (14).

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