EP0082761A1 - Vehicle door lock - Google Patents

Abstract

This lock comprises on the one hand a housing (1,2) for the lock mechanism (6) and on the other hand a keeper (5) movable relative to this housing (1, 2). The lock mechanism (6) is provided with a bolt (7) oscillating around an axis (8) perpendicular to the movement of the keeper (5) with which this bolt cooperates by a fork (24). An operating lever (9) of the lock is intended to authorize the rotation of the bolt in the direction of release of the strike by means of a blocking member (12) interposed between the bolt and the lever. The locking member (12) is movably mounted in one of the two parts (7) formed by the bolt and the lever between a projecting position to secure the parts and a retracted position to allow the free movement of rotation of the bolt relative to the lever. For securing, the second of the two parts comprises at least one notch (30, 31) in which the blocking member (12) is intended to penetrate. The two parts are mounted so as to be able to move apart from one another to bring out the blocking member from the notch provided in the second part.

Description

The present invention relates to a lock, in particular for the door of a motor vehicle, of the type comprising on the one hand a housing for the lock mechanism and on the other hand a keeper movable relative to this housing, the lock mechanism being provided a bolt oscillating around an axis which is perpendicular to the direction of movement of the keeper with which this bolt cooperates by a fork-shaped portion as well as a movable lever for operating the lock which is intended to authorize the rotation of the bolt in the direction of release of the striker by means of a locking member interposed between the bolt and the operating lever.

Such a lock is known from French Patent 2,472,651. The operating lever for this lock is formed by an oscillating arm carrying as a locking member a grooved roller which by its edge is engaged against a profiled surface of the latch so that the roller "rolls" on this surface during the operation of the lock, both in the direction of locking and in that of unlocking. To ensure the constant application of the roller on the profiled surface or cam of the bolt, the operating lever is elastically urged in order to press the roller on the cam of the bolt with a certain force. This roller is secured to the swinging arm by a hairpin spring, one branch of which passes through the groove of the roller.

The grooved roller described in this patent is certainly capable of reducing the friction between the bolt and the operating lever and in this sense provides an improvement compared to the conventional technique which generally recommends direct contact between the cam and the operating lever.

However, the fact remains that in this known lock, the roller must be resiliently pressed against the profiled surface or cam of the bolt with a certain force under pain of creating instabilities in the positioning of the bolt. The cam also has ranges high defining stops which abut against the grooved roller for blocking the bolt. These high areas are necessarily with fairly steep slopes and must be crossed by the roller during each opening and closing operation of the lock. Thus, this arrangement despite the reduction of friction by a "rolling" roller is subject to premature wear

Furthermore, the force with which the lock must be closed or opened is a direct function of the elastic force with which the roller is pressed on the cam. However, to obtain a satisfactory blocking, this force must be relatively large. This may cause some discomfort for the user or, if necessary, require automatic control mechanisms of comparatively large power.

The invention aims to provide an improved lock devoid of the aforementioned drawbacks.

It therefore relates to a lock of the type defined above which is characterized in that the blocking member is movably mounted in one of the two parts formed by the bolt and the operating lever between a projecting position to secure the parts and a retracted position to allow the free movement of rotation of the bolt relative to the lever in that, for securing, the second of the two parts comprises at least one notch in which the blocking member is intended to penetrate and into that the two parts are mounted so as to be able to move apart from one another to remove the blocking member from the notch provided in said second part.

It follows from these characteristics that no elastic member is necessary to maintain the locking member in permanent abutment against a cam surface with a force which must ensure the locking of the lock. On the contrary, the locking results from a corner positive cementing of the blocking member between the bolt and the operating lever which is held during the locking of the lock, while in order to unlock the latter, the blocking member is no longer positively blocked between the two parts, because these are then separated from each other by cutting their wedging connection which was provided by the blocking member.

During the movements which occur during the locking and unlocking of the lock, the parts in contact are not in elastic abutment against one another and in particular the blocking member does not undergo any elastic stress of significant value. Consequently, the wear of the surfaces in contact with the parts is extremely reduced.

• - la Fig.l est une vue en élévation et en coupe d'une serrure suivant l'invention;
• - la Fig.lA est une vue partielle à plus grande échelle montrant un détail de la serrure de la Fig.l;
• - les Fig.2 à 8 sont des vues en coupe prises respectivement selon les lignes de coupe correspondantes indiquées sur la Fig.l;
• - les Fig.9A à 9F représentent schématiquement toutes les phases de fonctionnement de la serrure;
• - la Fig.10 est une vue schématique de la serrure montrant les efforts subis par ses pièces essentielles;
• - la Fig.11 est un schéma électrique du circuit de commande du moteur d'actionnement de la serrure;
• - la Fig.12 représente par une vue en coupe et en élévation partielle une variante de la serrure suivant l'invention;
• - la Fig.l2A est une variante de la serrure visant à obtenir d'une autre manière le résultat auquel conduit la variante de la Fig.12;
• - la Fig.13 est une vue en coupe prise suivant la ligne 13-13 de la Fig.12;
• - la Fig.14 représente une autre variante de la serrure;
• - la Fig.15 est une vue en coupe prise suivant la ligne 15-15 de la Fig.14;
• - les Fig.16 et 17 représentent deux autres variantes de la serrure suivant l'invention.

The invention is set out below in more detail using drawings representing only one embodiment, in which:

• - Fig.l is an elevational view in section of a lock according to the invention;
• - Fig.lA is a partial view on a larger scale showing a detail of the lock of Fig.l;
• - Fig.2 to 8 are sectional views taken respectively along the corresponding section lines indicated in Fig.l;
• - Fig.9A to 9F schematically represent all the operating phases of the lock;
• - Fig.10 is a schematic view of the lock showing the forces undergone by its essential parts;
• - Fig.11 is an electrical diagram of the control circuit of the lock actuation motor;
• - Fig.12 shows a sectional view in partial elevation of a variant of the lock according to the invention;
• - Fig.l2A is a variant of the lock aimed at obtaining in another way the result to which the variant of Fig.12 leads;
• - Fig.13 is a sectional view taken along line 13-13 of Fig.12;
• - Fig.14 shows another variant of the lock;
• - Fig.15 is a sectional view taken along line 15-15 of Fig.14;
• - Fig.16 and 17 show two other variants of the lock according to the invention.

We will first refer to Fig.l to 8 to examine the construction of the lock according to the preferred embodiment of the invention.

This lock firstly comprises a box 1 of rectangular shape closed by a cover 2. If the lock is used for a vehicle door, which is a preferred application, this box is pressed by its bottom against the edge of the door or optionally incorporated therein. The housing 1 comprises a transverse blind passage 3 with a flared inlet 4 in which is intended to penetrate a keeper 5 movable in translation relative to the housing. In the application referred to above, this keeper 5 which is a simple piece of metal round is fixed in the amount associated with the door fitted with the housing 1.

• - un ensemble 7 formant pêne monté oscillant dans le boîtier 1 autour d'une broche 8 dont l'axe est perpendiculaire à la direction FI de mouvement de la gâche 5;
• - un levier de manoeuvre 9 monté oscillant dans le boîtier 1 autour d'une broche 10 dont l'axe est parallèle à celui de la broche 8;
• - un ensemble d'actionnement 11 de la serrure destiné à autoriser l'oscillation du levier de manoeuvre autour de son axe d'oscillation;
• - un organe de blocage 12 interposé entre l'ensemble formant pêne 7 et le levier de manoeuvre 9.

The latter serves as a housing for a lock mechanism 6, the essential sub-assemblies of which are:

• - An assembly 7 forming a bolt oscillating in the housing 1 around a spindle 8 whose axis is perpendicular to the direction FI of movement of the keeper 5;
• - An operating lever 9 mounted oscillating in the housing 1 around a spindle 10 whose axis is parallel to that of the spindle 8;
• - An actuation assembly 11 of the lock intended to authorize the oscillation of the operating lever around its axis of oscillation;
• - a locking member 12 interposed between the bolt assembly 7 and the operating lever 9.

Each of the sub-assemblies thus arranged will now be described in detail.

The hinge pin 8 is riveted on the cover 2 as shown at 13 in Fig.2 and positioned axially and transversely relative to the bottom of the housing 1 by positioning lugs 14a and 14b projecting from this housing bottom. The barrel of this spindle constitutes the axis of oscillation of two parallel plates 15 and 16 which are integral in rotation with one another by a spacer 17 by means of pins 18 obtained by deformation in opposite directions of this spacer and engaged in axial holes 19 provided in the respective plate 15 or 16.

The plate 15 has a first notch 20 to be described in detail later, a second notch 21 for hooking one of the branches of a helical return spring 22 and a heel 23 forming a stop. The return spring 22 is engaged on the positioning lug 14a of the housing 1 (coaxial with the spindle 8) and its opposite branch bears against the positioning lug 14b which occupies an eccentric position relative to this spindle like this is shown clearly in FIG. 3. The bolt assembly 7 is biased by the spring 22 to rotate clockwise, considering FIG. 1 (arrow F ₂ ).

The plate 16 has a fork-shaped portion 24 which is intended to overlap the keeper 5 when the lock is locked as shown in FIG. 1.

The operating lever 9 (Fig. 1, 6 and 7) is formed by a slightly arched plate which is rotatably mounted around the spindle 10 by one of these-ex hoppers. This pin 10 is surrounded by a helical spring 25, one of the branches of which is hooked on a stop lug 26 of the cover 2 and the opposite branch of which is engaged in a hole 27 in the lever 9 to urge the latter in the opposite direction. clockwise (seen in Fig. 1).

The operating lever 9 has a concave curved edge 28 opposite the plate 15 which has a curved conjugate edge 29 of convex shape in which the notch 20 is cut. The curved edge 29 of the lever 9 has two adjacent notches 30 and 31 The edges 28 and 29 have an arc shape. On the side opposite to the plate 15, the operating lever 9 has a curved edge 32 forming a cam follower.

The actuation assembly 11 comprises an electric drive motor 33, the output shaft of which is provided with an endless screw 34. The latter meshes with a toothed wheel 35 rotatably mounted around a fixed spindle 36 (Fig. 4 and 6). The toothed wheel 35 carries a cam ring 37, a first cam 38 of which is oriented radially in order to cooperate with the outer curved edge 32 of the operating lever 9. The other cam 39 is oriented axially and cooperates with the pusher 41 of a electrical contact 42.

In the preferred embodiment of the lock, the locking member 12 is a roller of circular section whose radius is equal to that of the notches in a circular arc 30 and 31 provided in the operating lever 9. This is mounted between the lateral flanges of a retaining bracket 43 whose extent is such that the roller 12 is held in place in the notch 20 formed in the wafer 15 whatever the operating phase of the lock. The stirrup 43 is mounted oscillating on the spindle 10 and oscillates in concert with the operating lever 9.

Fig. 1A shows by a view on a larger scale, the shape of the notch 20 formed in the edge 29 of the plate 15. If we consider the pivoting movement of the bolt assembly 7 in the direction of opening of the lock (arrow F ₂ ), the notch 20 is delimited by an upstream rounded 20a forming a thrust spout for the locking member 12 and this rounded is connected to a surface portion 20b roughly in a circular and concave arc, in turn connected to a flat sliding surface 20c which ends on a spout 20d for holding the blocking member 12.

It will be noted that the connection surface 20b in an arc of a circle has a radius which is less than that of the roller or locking member 12. Furthermore, the volume of the notch 20 is chosen in such a way that the roller 12 can completely s 'retract within the limits of the periphery of the plate 15 which is defined, in the region of the notch 20 by the fictitious line connecting the two sections of the curved edge 29 of the plate 15. In other words to retract , the roller 12 can slide on the flat surface 20c to be housed in the part of the notch 20 which is defined by the connection surface 20b.

It will also be noted that a damper 44 is housed at the bottom of the passage 3, this damper being crushed by the keeper 5 when the lock is completely locked.

The operation of the lock just described will now be examined with reference to Figs. 9A and 9F.

In Fig. 9A, the lock is at rest in the open position (door open). The bolt 7 is tilted to its extreme unlocking position in which it is placed under the action of the spring 22, the position being fixed by the heel 23 which, serving as a stop comes to bear against the rear edge of the lever 9. The conjugate edges 28 and 29 are offset with respect to each other, the notch 20 being located opposite the end of the edge 28 which is distant from the articulation pin 10. The blocking member or roller 12 is placed in the "upstream" part of the notch 20 seen in the direction F ₂ of bias towards the opening of the bolt 7. The cam 38 is in contact with the outer convex edge 32 of the lever operation 9. The electric motor is de-energized.

When the door is closed, the keeper 5 comes to meet the forked part of the plate 16 of the bolt 7 by exerting a force f _i on it. This force acts against the spring 22 and if it is sufficient, initiates the rotation movement of the bolt 7 in the opposite direction to that of the needles of a watch, the spring 22 being progressively tensioned (arrow F ₃ -a; Fig. 9B). The roller 12 is first of all simply transported with the bolt 7 by following the edge 28 of the operating lever. The movement of the keeper continuing, there comes a time when the roller 12 is located opposite the notch 31 hereinafter called "first notch". If the user stops the closing movement at this instant, the lock will be locked in a closing position called "first notch" by a slight retraction of the bolt in the opposite direction (arrow F3-b) under the impulse of the spring 22 which can possibly be assisted by the elastic force generated by the damper 44 assumed to be slightly compressed at this time by the keeper.

It will be noted that in general, motor vehicle locks have two locking positions called "first" and "second notches", the "first notch" position corresponding to a temporary closing of the door. In this position, the door is not really locked and this state of affairs is signaled immediately after starting the vehicle by an unpleasant noise prompting the driver to stop. to complete the closing of the door. Fig. 9B therefore shows the lock in this particular "first notch" locking condition.

To move from this position to the next ("second notch"), the roller 12 should be transferred from the position of FIG. 9B to that of FIG. 9C. The keeper again exerting a force on the bolt 7, the latter continues its movement in the direction F ₃ -a which makes the flat surface 20c (Fig. 1A) move away from the concave edge 28 of the operating lever 9. The volume available for the roller 12 increases and the latter can therefore come out of the notch. 31 in which he was previously engaged. The bolt still continuing its movement, it pushes the roller 12 forward so that the latter crosses the ridge between the two notches 30 and 31. The movement continues until the roller 12 has passed in front of the notch 30 , when the door compressed its seals on the frame of the vehicle and when the keeper deformed the shock absorber 44 as much as possible (Fig. 1). There follows again a backward movement of the bolt 7, which causes the roller 12 to engage in the notch 30 of the operating lever 9. The assembly is then blocked (FIG. 9D), the balance of forces being that shown in FIG. 10. It can be seen that the roller 12 projects from the perimeter of the bolt 7 defined by the curved edge 29, whereas previously it was retracted inside this perimeter to allow a free rotational movement of the bolt.

The transfer from the retracted position of the roller 12 to its projecting position is achieved by a slight recoil movement of the bolt during which the planar surface 20c of the notch 20 pushes the roller outwards.

To unlock the lock, it is necessary to excite the motor 33 to cause the rotation of the gear 35 in the direction of arrow F ₄ . In this way, the cam 38 leaves the convex edge 32 of the operating lever 9 which makes it rotate about its axis in the direction of the arrow F ₅ while being driven by the force of the spring 25. This results in an enlargement of the volume available to the roller 12 from which the notch is released. The bolt 7 is immediately brought back on the one hand by the spring 22 and on the other hand (if necessary) by the keeper which is pushed back by the damper 44 and possibly the door seals.

If the lock is placed vertically as shown in Fig. 1, the roller 12 is then caused to fall by gravity into the bottom of the notch 20 to find itself again in its retracted position. If the lock occupies a different position, this movement can be caused by a spring similar to spring 55 (then absent) but acting in the opposite direction. However, in any event and whatever the position of the lock, the roller 12 is returned to its retracted position as soon as the lever 9 has returned to its initial position, which occurs very quickly after a complete revolution of the cam 38 , that is to say before the bolt has found its own (Fig. 9F).

Fig. 11 shows an electrical diagram of an example of a motor control circuit 33. In this FIG., It can be seen that the lock can be controlled by a simple push button 45 which is mounted between one of the poles of a source supply and an assembly 46 for instantaneous stop of the motor 33. The push-button 45 is mounted in parallel on the switch 42 acting as a holding contact. The assembly 46 comprises a short-circuit transistor 47 of the armature of the motor 33. Its collector is connected with one of the motor terminals to the opposite pole of the power source, while by its emitter is connected between the cathode of a diode 48 and The opposite terminal of the motor armature. The base of the transistor is connected by a resistor Rl to the anode le the diode 48 and to the parallel mounting of the push button 45 and the switch 42. A resistor R2 connects the collector of the transistor 47 to the anode of the diio 48.

When the push button 45 is actuated, the notor 33 is energized through the diode 48, the transistor 47 remaining blocked, since its base and its emitter are at the same potential. The push button is immediately taken up by the contact 42 because the cam 39 opposes its high range to the push button 41 due to the rotation of the toothed wheel 35. When the latter has almost completed one revolution, the push button 41 returns to the low range of cam 39 and switch 42 is open. The motor 33 continuing to rotate by the inertia effect becomes a generator thus unlocking the transistor 47 which then becomes a short circuit for this generator. The engine therefore stops in a fraction of a second calculated in such a way by the choice of the values of the components that the cam 38 is exactly in its initial position. According to the force diagram of FIG. 10, it can be seen that the opening of the lock requires a force which is none other than the friction force between the cam 38 and the convex outer surface 32 of the operating lever. The roller 12 does not have to cross any obstacle either during locking or during unlocking. The electric motor 33 can therefore be of very low power allowing it to be inserted into the housing of the lock. In addition, it can be seen that the roller 12 is under stress only in the locking position of the lock which is static. During its movements, it moves without being pressed against any surface which reduces wear to a minimum value. It is the same with profiled surfaces of the bolt on the one hand and the operating lever on the other hand.

Figs. 12 and 13 show a variant of the lock in which the two plates 15 and 16 are integral with one another with the possibility of a slight angular movement. To this end, they are connected to each other by a spacer 49 which by a first deformation 50 is rigidly fixed to the plate 16, while a second deformation 51 is engaged with a slight play in a slot 52 in bean shape provided in the other plate 15. The spacer is mounted to oscillate on the spindle 8.

A helical spring 53 is mounted around the spindle while being hooked by its ends respectively in the plates 15 and 16 in order to urge them around the spindle 8 in the direction of the arrows F ₆ .

When the lock of Figs. 12 and 13 is locked (as shown), the plates 15 and 16 are in a relative angular position such that the deformation 51 is pressed against one of the ends of the slot 52, the spring 53 being tensioned. As soon as the lever 9 is moved away from the plate 15 for unlocking, the keeper 5 is released and the plate 16 is turned relative to the plate 15, while the bolt 7 as a whole rotates around the spindle 8. It As a result, the roller 12 receives an impulse of movement which quickly releases it from its locking position and precipitates it into the bottom of the notch 20.

Fig. 12A shows another variant in which there is provided a roller 12A with circular groove 54 into which a spring 55 of wire 55 can penetrate it urging it towards the bottom of the notch 20. This spring 55 is fixed in the plate 16 by extending roughly perpendicular to the flat surface 20c of the notch 20, and is tensioned when the roller 12A is in its "second notch" locking position. By this variant, we aim to obtain the same result as in the variant of FIGS. 12 and 13, namely to guarantee that the roller 12A is placed at the bottom of the notch 20 as soon as the lever 9 has operated the unlocking.

Figs. 14 and 15 illustrate another variant in which the lock according to the invention comprises a bolt 7A produced in one piece from a single plate with two plates 56 and 57 arranged in parallel and joined together by a joining part 58 perpendicular to these trays. The assembly is mounted oscillating on the spindle 8 which crosses the plate 56. The latter has the forked portion intended to overlap the keeper 5 for locking, while the plate 57 comprises the notch 20.

The variant also includes a blocking member 12B which is here formed by a spherical ball.

The operation of this variant is identical to that of the embodiment shown in FIGS. 1 to 8.

Fig. 16 shows another variant in which the lock comprises a blocking member 12 constituted by a block in the form of a rectangular parallelepiped. In this case, the operating lever 9 has notches 30A and 31A in the form of a V, while the notch 20A is delimited by two mutually perpendicular surfaces 20A-a and 20A-b.

According to the variant of FIG. 17, the blocking member 12D is in the form of a shouldered cylindrical pin which is mounted in a housing 20B provided in the plate 16. This pin is biased towards the outside by a spring 59. In this case, the operating lever 9 has a single notch 60 mounted, preferably movable in translation instead of being pivotable (see arrows F ₇ ).

Claims (20)

1 - Lock, in particular for the door of a motor vehicle, of the type comprising on the one hand a housing (1,2) for the lock mechanism (6) and on the other hand a keeper (5) movable relative to this housing ( 1, 2), the lock mechanism (6) being provided with a bolt (7, 7A) oscillating about an axis (8) which is perpendicular to the direction of movement of the keeper (5) with which this bolt cooperates with a fork-shaped portion (24), as well as a movable operating lever (9) of the lock which is intended to authorize the rotation of the bolt in the direction of release of the keeper by means of '' a locking member (12 to 12D) interposed between the bolt and the operating lever, characterized in that the locking member (12 to 12D) is movably mounted in one of the two parts (7; 7A, 9 ) forced by the bolt and the operating lever between a projecting position to secure the parts and a retracted position to allow the free movement of rotation of the bolt relative to the lever, in that, for securing the second of the two parts comprises at least one notch (30,31; 30A, 31A, 60) in which the locking member (12 to 12D) is intended to penetrate and in that the two parts are mounted so as to be able to move away from one another to bring out the blocking member from the notch provided in said second part. 2 - Lock according to claim 1, characterized in that said blocking member (12 to 12D) is mounted in a housing ( ₂₀ ; 20A; 20B) formed in the first (7; 7A) of said parts being delimited by a profiled edge (29) thereof, housing which in the unlocked position of the lock is closed by a portion of a profiled edge (28) of the second (9) of said parts, located opposite the profiled edge of the first piece and having said notch (30, 31; 30A, 31A; 60). 3 - Lock according to claim 2, characterized in that the profiled edges (28, 29) all play a general shape in an arc. 4 - Lock according to any one of reven-3ications 1 to 3, characterized in that said blocking member (12; 12A) is a roller of cylindrical shape. 5 - Lock according to any one of claims 1 to 3, characterized in that said locking member (12B) is a ball of spherical shape. 6 - Lock according to any one of claims 1 to 3, characterized in that said blocking member (12C) is a block of generally polygonal shape, preferably in the shape of a rectangular parallelepiped. 7 - Lock according to any one of claims 1 to 3, characterized in that said blocking member (12D) is in the form of a cylindrical pin. 8 - Lock according to any one of claims 4 and 5, characterized in that the portion of the profiled edge (29) of said first part (7; 7A) delimiting said housing comprises at the entrance of this housing projections (20a and 20d) intended to retain the blocking member (12, 12A) in this housing, and in that between these projections extend a portion of rectilinear surface (20c) serving as a sliding surface for the blocking member , and a concave portion whose roundness is of radius smaller than that of the blocking member. 9 - Lock according to any one of claims 4, 5 and 8, characterized in that the notch (s) (30, 31) of said second part (9) are in an arc and preferably immediately adjacent. 10 - Lock according to claim 6, characterized in that the portion of the profiled edge of said first part (7) delimiting said housing comprises two flat surfaces (20A-a; 20A-b) making an angle don born between them equal to the angle at the top of the polygon of the locking member and in that at the outer end of one of these surfaces is provided a lug for retaining the latter. 11 - Lock according to any one of claims 1 to 10, characterized in that the first part is the bolt (7) of the lock and the second part is an operating lever (9) mounted oscillating in the housing (1, 2) around an axis parallel to that of the bolt. 12 - Lock according to claim 11, characterized in that said operating lever (9) is equipped with a spring (25) biasing it in a direction which moves it away from said bolt (7) and in that it cooperates with a cam actuating device (11) temporarily authorizing the movement of the lever when unlocking the lock in order to release said blocking member. 13 - Lock according to claim 12, characterized in that the cam actuating device comprises a toothed wheel (37) intended to be driven by an electric motor (33) and equipped with a cam (38) which is arranged for constantly maintain the profiled edge (29) of the operating lever (9) in the vicinity of the conjugate profiled edge (28) of the bolt against the action of said spring (25) except during the unlocking phase of the lock. 14 - Lock according to claim 13, characterized in that said electric motor (11) is supplied through a holding contact (42) mounted in parallel on an unlocking control button (45), this holding contact being closed during rotation of said toothed wheel and open when said cam (38) maintains the operating lever (9) in the vicinity of the bolt (7). 15 - Lock according to claim 14, characterized in that the electric motor (11) is supplied through a control circuit (46) which runs circulates its armature when it is not supplied. 16 - Lock according to any one of claims 11 to 15, characterized in that said bolt (7) is equipped with a spring (22) mounted so as to urge it in its locking position and in that the bolt comprises a spout (23) intended to limit the stroke of the bolt in the direction of opening by pressing against a fixed stop (lever 9). 17 - Lock according to any one of claims 11 to 16, characterized in that the bolt is made from two parallel plates (15, 16) rotatably mounted on the axis (8) of the bolt with the interposition of a spacer piece (17) and in that one of the plates has said forked portion (24) and the other said profiled edge (29). 18 - Lock according to claim 17, characterized in that said plates (15, 16) are angularly movable relative to each other against the action of a spring which urges them in opposite directions, it being understood that the one carrying the forked portion (24) is biased in the direction of unlocking the lock. 19 - Lock according to claim 7, characterized in that said cylindrical pin (12D) is slidably mounted in the housing (20B) of said first part (7) being biased towards the outside thereof by an elastic member ( 59). 20 - Lock according to any one of claims 4 to 6, characterized in that an elastic member (55) is provided in said housing (20) of the first part to urge said locking member in its position in which it is set back in this room (7).

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