EP1611306B1 - Lock for an opening on a motor vehicle, with a memory for unlocking/locking - Google Patents

Abstract

The lock includes an opening lever and a locking lever capable of displacing a connecting rod between a first position, in which the opening lever can cooperate with the connecting rod to cause the opening of the lock, and a second position which prevents the opening of the lock, blocking means for preventing a displacement of the rod between the first and second positions when the opening lever is put into an opening position before the locking lever is actuated, and an elastic device capable of memorizing both an unlocking action and a locking action when the locking lever is actuated while the connecting rod is being blocked by storing an unlocking energy or a locking energy in response to the actuation of the locking lever to automatically cause an unlocking or a locking of the lock when the opening lever returns into a position of rest.

Description

The present invention relates generally to locks for a motor vehicle opening, with opening control and / or mechanical or electrical locking / unlocking.

In certain motor vehicle door locks, when the locks of the vehicle are in a locked state and an outside handle or pallet of one of the doors of the vehicle is actuated before a unlocking command is transmitted to the lock of the vehicle. the door whose handle or pallet has been actuated, the external opening lever of the lock connected to the handle or to the pallet which has been actuated may block the unlocking mechanism of the corresponding lock, which prohibits the opening of said lock and, consequently, prohibits the opening of the corresponding door.

For example, for a lock of this type with electric locking / unlocking control, in the case where a user of a vehicle approaches the vehicle and attempts to open a door thereof by actuating the handle or outer pallet of the door before the driver of the vehicle has ordered the unlocking of the locks of the vehicle using a remote control box or with a key, when the unlocking order reaches the various locks of the vehicle the electric motors of the locks cause the unlocking of door locks whose handle or outer pallet is not actuated, while the unlocking of the lock whose handle or outer pallet is kept actuated, remains condemned.

So that the locked lock can be unlocked and opened, the user must first release the handle or outer pallet of the door, then the driver must successively recondamner all the locks using the remote control or the key , then unlock all the locks again using the remote control or the key, after which all the locks can be opened by pressing the handles or the door paddles. All these maneuvers delay the entry of the user (s) and the driver into the vehicle and are therefore felt as an inconvenience, especially in emergency situations, for example when the user (s) and the driver are in a hurry to find shelter. inside the vehicle, for example because of inclement weather.

The document FR 2 789 716 describes a lock that allows the implementation of the unlocking function of the lock, even when a member of the lock comes block the opening kinematic chain of the lock, thus overcoming the disadvantage mentioned above. For this purpose, in the circumstances mentioned above, an elastic device provided in this known lock memorizes the unlocking action and performs it as soon as the pallet or outer handle is released. As a result, the lock which had remained locked can be immediately opened by re-actuating a second time the handle or outer pallet of the door, without it being necessary for the driver to recondamne and decondamp again all the locks at the door. using the remote control or the key.

The problem that arises now is to allow the conviction of a lock, even when a lock member is blocking the kinematic chain of conviction of the lock. Such a situation may arise for example when a person condemns the locks of his vehicle with the key or the remote control, while another person, for example, has forgotten something in the vehicle interior or who wishes to take something in the boot, is operating the handle or pallet opening outside a door or trunk of the vehicle, or while another person remained inside the passenger compartment of the vehicle is actuating the handle or pallet of interior opening of a door of the vehicle. In either of these situations, all locks of the vehicle are locked, except that of the door or the trunk whose handle or pallet was actuated at the time of conviction.

The present invention therefore aims to provide a lock for opening of a motor vehicle, which allows the implementation of the locking function of the lock, even when a member of the lock comes to block the kinematic chain of locking of the lock .

For this purpose, the invention relates to a lock for a motor vehicle door, comprising a movable locking lever between a first position corresponding to a unlocked state of the lock and a second position corresponding to a locked state of the lock, a link rod which, in response to a displacement of the locking lever between its first and second positions, is movable between a first active position and a second inactive position, characterized in that it comprises an elastic device able to store a energy of locking in the event of a locking of the link rod in its first active position in order to automatically cause the link rod to move from its first active position to its second inactive position after release of the link rod.

The lock according to the invention may further comprise the following characteristics:

the elastic device is also able to store a deconding energy in case of locking of the connecting rod to automatically cause the displacement of the link rod from its second inactive position to its first active position after release of the connecting rod,

the elastic device comprises a helical torsion spring with two branches, which directly connects the locking lever to the connecting rod,

one of the branches serves to drive the link rod from its second inactive position to its first active position and the other of the two branches serves to drive the link rod from its first active position to its second position. inactive

the two branches of the helical torsion spring, seen in the axial direction, are crossed,

the locking lever is substantially in the form of a disk comprising a central hub, a light which is formed in the disk and which extends in an arc around a portion of the central hub, and at least a portion of a drive projecting from said face of the disk halfway along at least one longitudinal edge of the arcuate lumen,

the helical torsion spring is arranged around the central hub of the locking lever so that the two branches of said torsion coil spring sandwich said driving portion of the locking lever and pass radially across the arcuate light,

- The link rod comprises, at one of its ends, a first coupling pin which passes into the arcuate light of the locking lever between the two branches of the torsion coil spring, and at its other end a second coupling pin which passes into an oblong slot formed longitudinally in an opening lever, said oblong slot extending in a first direction allowing movement of the connecting link from its first to its second position when the opening lever is in the position resting, and in a second direction preventing said movement of the connecting rod when the opening lever is in the open position,

- The lock comprises a bolt, a pawl adapted to retain the bolt in a position corresponding to a closed state of the lock, and a movable opening lever under the action of an opening control means between a rest position and an open position of the lock, characterized in that the lock further comprises a false pawl and that the pawl, the pawl and the opening lever are mounted in this order on a common axis of pivoting, the false pawl being integral in rotation with the pawl and having a tab on which the second coupling pin of the link rod acts to cause the displacement of the pawl and the pawl to the release position of the bolt when the rod of bond is in its first position and the opening lever is moved from the home position to the open position,

said tab has a stop surface arranged to fulfill the function of said locking member,

the opening lever is an external opening lever intended to be connected by a force transmission member to an external opening control member of a motor vehicle door.

Other features of the lock will become apparent from the following description of an embodiment given by way of example with reference to the appended drawings in which:

- Figure 1 is a perspective view of a lock according to one embodiment of the invention;

- Figure 2 is a perspective view showing, on a larger scale than Figure 1, a locking lever with a spring, which are part of the lock of Figure 1;

- Figure 3 is a perspective view showing the parts of the various mechanisms of the lock in positions corresponding to a closed and locked state of the lock, the outer opening lever of the lock being shown in the rest position;

- Figure 4 is a perspective view similar to that of Figure 3 after the outer opening lever has been brought into the open position, the lock is still in a closed state and condemned;

- Figure 5 is a perspective view similar to Figure 4, after the locking lever of the lock has been brought into a unlocking position;

FIG. 6 is a view showing, on a larger scale, a detail of FIG. 5;

- Figure 7 is a perspective view similar to Figure 5, after the outer opening lever has been released, the lock being in a closed state and uncondensed;

- Figure 8 is a perspective view similar to Figure 7, the lock being in a unlocked state and open, after the outer opening lever has been actuated;

- Figure 9 is a perspective view similar to Figure 8, after the locking lever of the lock has been brought to a locking position;

- Figure 10 shows, on a larger scale, a detail of Figure 9;

- Figure 11 is a perspective view similar to Figure 9, after releasing the outer opening lever, the lock being in an open and condemned state;

- Figure 12 is a perspective view similar to Figure 11, the lock being in a closed state and condemned, after the door with the lock has been slammed.

Referring first to Figure 1, it can be seen that the lock has a plate 1, sheet metal, suitably cut and folded, which forms part of the lock housing, intended to be fixed on the edge of a door, not shown, of a motor vehicle. The plate 1 comprises a base portion 1a and a wing 1b bent at 90 ° with respect to the base portion 1a. An opening 2 is formed partly in the base portion 1a and partly in the wing 1b of the plate 1 for the passage of a striker (not shown) which is usually fixed to the body of the vehicle and which, in use , cooperates with a bolt 3, fork-shaped, the lock for holding in the closed position the door equipped with the lock. The bolt 3 is pivotally mounted on an axis 4 whose end is housed in a hole, not shown, of the base portion 1a of the plate 1, the other end of the axis 4 being housed in another hole of another, not shown, portion of the lock housing.

In the closed state of the lock (Figures 1, 3-5, 7 and 12), the bolt 3 is held in a retention position of the striker by a pawl 5 which is pivotally mounted on an axis 6, one end of which is housed in a hole, not shown, of the base portion of the plate 1, the other end of the axis 6 being housed in another hole of said other part of the lock housing. The pawl 5 is biased by a first spring 7 to the position shown in Figure 1, wherein it holds the bolt 3 in the retention position of the striker. The spring 7 may for example consist of a helical torsion spring, which surrounds the axis 6 and which comprises a branch 7a resting on a tab 5a of the pawl 5 and another branch 7b resting on a stop, not shown, provided on the housing of the lock, for example on the plate 1.

The lock further comprises a false pawl 8 which is also pivotally mounted on the axis 6 and which is integral in rotation with the pawl 5. The false pawl 8 comprises a tab 8a, on which it is possible to act as will be seen further to pivot together the false pawl 8 and the pawl 5 against the return force of the spring 7, to bring the pawl 5 in a position in which it releases the bolt 3. When the pawl 5 is in the release position of the bolt 3, the latter can pivot about the axis 4 under the action of a second spring 9 which brings the bolt 3 into a position in which it releases the strike and thus allows the opening of the door. The spring 9 may for example be constituted by another helical torsion spring, which is arranged around the axis 4 and which comprises a branch 9a engaged in a notch 11 of a protrusion 3a which projects on one side of the bolt 3 and which is an integral part thereof, and another branch 9b bearing on a stop, not shown, provided in the lock housing, for example on the plate 1.

The lock further comprises an external opening lever 12, which is also pivotally mounted on the axis 6. When the lock is in use, the outer opening lever 12 is connected by a force transmission member 13, partially shown in Figures 1,3-5, 7-9, 11 and 12, to an external opening control member, not shown, constituted for example by a handle or outer pallet of the door equipped with the lock. The force transmission member 13 may be constituted for example by a rod or a Bowden cable. Only the end portion of the rod or cable 13 which is attached to the outer opening lever 12 is shown in the above figures.

In use, the outer opening lever 12 can be moved by the force transmission member 13 from a rest position (FIGS. 1, 3, 7, 11 and 12) to an open position (FIG. 5, 8 and 9). When the lock is in a unlocked state, the movement of the outer opening lever 12 from the rest position to the open position causes, in a manner to be described later, the lock from its closed state to its open state.

A third spring 14 may be provided to bias the outer opening lever towards its rest position. The spring 14 may for example consist of a helical torsion spring disposed around the axis 6 and having a branch 14a bearing on a lug 12a of the outer opening lever 12 and another branch 14b resting on a stop, not shown, provided in the lock housing.

The lock further comprises a locking mechanism 15 comprising a locking lever 16 which is coupled to one end of a link rod 17, the other end of which is coupled to the outer opening lever 12.

As is particularly visible in Figure 2, the locking lever 16 has substantially the shape of a disc having a central hub 16a which projects on a face of the disc for mounting the locking lever on an axis of rotation, no shown, carried by the wing 1b of the plate 1. In use, the locking lever 16 can be rotated mechanically or electromechanically on the above-mentioned axis of rotation of a first position or unlocking position, corresponding to a unlocked state of the lock (Figures 1, 7-9), at a second position or locking position, corresponding to a condemned state of the lock (Figures 3-5, 11 and 12). The movement (rotation) of the lever 16 from its unlocking position to its locking position, and vice versa, can be obtained, in a known manner, manually by means of a furrow pull, not shown, connected directly or indirectly to the lever 16, and / or mechanically by means of a cylinder actuated by a key, and / or electromechanically by an actuator, such as an electromagnet or an electric motor and gear unit, controlled by a central control unit. response to receipt by the latter of a valid remote control signal transmitted by a remote control or in response to a valid identification signal issued by an identification member of a hands-free access system.

In the disk of the locking lever 16 is formed a slot 18 which extends in an arc around a portion of the central hub 16a of the disc. Preferably, the light 18 is also formed in a substantially bean-shaped protuberance 19 which protrudes from the same face of the disc as the hub 16a, as shown in FIG.

An elastic device 21 carried by the locking lever 16 directly and elastically connects it to the connecting rod 17. As can be seen better in FIG. 2, the elastic device 21 comprises a torsion coil spring with two branches, which is arranged around the central hub 16a of the locking lever 16 so that the two branches 21a and 21b of the spring 21 pass radially across the arcuate lumen 18. Each of the two branches 21a and 21b of the spring 21 is free to move a limited angle in two slots 22a, 23a and 22b, 23b, respectively, formed in the arcuate walls of the protuberance 19. The aforesaid limited angle corresponds to the angle of rotation of the locking lever 16 between its two extreme positions of conviction and deconviction. Four notches 24a, 25a and 24b, 25b are also provided in the arcuate walls of the protrusion 19 and communicate respectively with the slots 22a, 23a and 22b, 23b to allow the installation of the spring 21 around the central hub 16a of the lever. condemnation 16 and the establishment of branches 21a and 21b of said spring in the aforementioned slots. Once in place, the two branches 21a and 21b of the spring 21 enclose between them the two parts 26 and 27 of the protuberance 19, which are substantially mid-length of the longitudinal edges of the arcuate light 18, respectively between the slots 22a and 22b and slots 23a and 23b. As will be seen below, the two parts 26 and 27 of the protrusion 19 constitute drive portions for one or the other of the two branches 21a and 21b of the spring 21 in the direction of rotation of the locking lever 16 .

Preferably, the branches 21a and 21b of the spring 21 are crossed as shown in Figure 2. More specifically, the branch 21a which comes from the part of the spring 21 located on the left side (looking at Figure 2) of the hub 16a of the locking lever 16 is engaged in the slots 22a and 23a which are on the right side of the protrusion 19, while the branch 21b which comes from the part of the spring 21 located on the right side of the hub 16a is engaged in the slots 22b and 23b located on the left side of the protuberance 19.

Referring again to Figure 1, it can be seen that the connecting rod 17 comprises, at one end, a coupling pin 17a which passes into the arcuate slot 18 of the locking lever 16 between the two branches 21a and 21b of the spring 21. At its other end, the connecting rod 17 comprises a second coupling pin 17b (not visible in Figure 1, but clearly visible in particular in Figures 3 and 4), which passes into an oblong slot 28 formed longitudinally in the outer opening lever 12 and protruding below said opening lever exterior. Advantageously, the two coupling pins 17a and 17b may be quarter-turn pins. More specifically, each of the two pins 17a and 17b has, at its free end, a radial projection which, after having been passed through the arcuate lumen 18 or in the oblong slot 28 and after a relative rotation of about a quarter of a turn. mating pin 17a or 17b with respect to the locking lever 16 or the outer opening lever 12, clings behind said lever 16 or 12 to prevent the coupling pin from being unintentionally released during use corresponding light 18 or 28.

When the outer opening lever 12 is in the rest position (FIG. 1), the oblong slot 28 extends in a direction allowing the link rod 17 to be displaced by the locking lever 16 of a first active position. (Figure 1) corresponding to a unlocked state of the lock to a second inactive position (Figure 3) corresponding to a condemned state of the lock. Note that, in the first position of the connecting rod 17 (Figure 1), the coupling pin 17b of the rod 17 and the tab 8a of the false pawl 8 are located next to each other and to radial distances equal to the axis 6. As a result, when the outer opening lever 12 is moved angularly from the rest position (Figure 7) to the open position (Figure 8) by the organ 13, the coupling pin 17b comes into contact with the tab 8a of the false pawl and pivots it and the pawl 5 about the axis 6, in order to release the bolt 3 from the lock, which releases the latch in turn, thus opening the door of the vehicle.

When the connecting rod 17 is in the second inactive position (FIG. 3) corresponding to the locked state of the lock, the coupling pin 17b of the link 17 is at a greater radial distance from the axis 6 than the tab 8a of the false pawl 8. Under these conditions, when the outer opening lever 12 is moved angularly from the rest position (FIG. 3) to the open position (FIG. 4) by the force transmission member 13, the coupling pin 17b of the rod 17 passes in front of the tab 8a without acting on it, so that the movement of the outer opening lever 12 has no effect on the false pawl 8 and the pawl 5. The bolt 3 remains blocked by the pawl 5 in the retention position of the striker, and the lock remains closed.

We will now describe the operation of the lock in the two critical situations exposed at the beginning of this memo. We will first describe, with reference to FIGS. 3 to 8, the case where a unlocking action takes place while the external opening lever 12 has already been actuated and is still in the open position, then it will be described, with reference to Figures 7 to 12, the case where a locking action occurs while the external opening lever has already been actuated and is maintained in the open position.

Starting from the situation shown in FIG. 3, in which the lock is in a closed and locked state, it is assumed that a user actuates the handle or outer pallet, not shown, which is connected by the force transmission member 13 at the outer opening lever 12 of the lock, in order to open the corresponding door of the vehicle. Under these conditions, the outer opening lever 12 comes in the position shown in Figure 4 and the coupling pin 17b is placed in front of the tab 8a of the false pawl 8 without acting on it so without opening lock. If, at this moment, the locking lever 16 is moved angularly in the clockwise direction, as indicated by the arrow F1 in FIG. 5, to pass from the locking position to the unlocking position, the link rod 17 remains blocked. substantially in the same position as that of Figure 4, because the coupling pin 17b of this rod bears against a stop surface 29 of the tab 8a of the false pawl 8. It follows that, at this time, the lock is not unlocked.

However, during the rotation of the locking lever 16 in the direction of the arrow F1, as the connecting rod 17 is blocked by the stop surface 29 of the tab 8a of the false pawl 8, the coupling pin 17a of the connecting rod 17 retains the branch 21a of the spring 21, while the drive portions 26 and 27 of the locking lever 16 drive the branch 21b of the spring away from the branch 21a, as shown in Figure 6. As a result, the spring 21 stores energy, thereby memorizing the unlocking action.

As soon as the user releases the handle or outer pallet of the door, the outer opening lever 12 of the lock is returned to its rest position (FIG. 7) by the spring 14. During the pivoting movement of the door lever outside opening 12 about the axis 6 to its rest position, the lever 12 slides the coupling pin 17b of the connecting rod 17 tangentially along the stop surface 29 of the tab 8a of the false ratchet 8. As soon as the coupling pin 17b leaves the stop surface 29 and that it no longer constitutes an obstacle to a displacement of the coupling pin 17b radially towards the axis 6, in the oblong slot 28 of the lever 12, the link rod 17 is pushed by the branch 21a of the spring 21 which restores the energy that it had stored during the rotation of the locking lever 16 in the direction of the arrow F1. As a result, the connecting rod 17 comes in the position shown in Figure 7, corresponding to a closed state, but unlocked lock. In this state, the user can again operate the handle or outer pallet of the door to bring the outer opening lever 12 into its open position as shown in Figure 8. As at this time the lock is in a unlocked state, the coupling pin 17b of the connecting rod 17 acts on the tab 8a of the false pawl 8 and rotates it and the pawl 5 in the clockwise direction as indicated by the arrow F2 in Figure 8. It follows that the pawl 5 releases the bolt 3 which pivots in turn around the axis 4 under the action of the branch 9a of the spring 9, to release the strike and allow the opening of the door.

Starting from the situation represented in FIG. 7, which corresponds to the closed and unlocked state of the lock, it is now assumed that a user actuates the door handle or outer pallet of the door in order to open it, just before that the driver of the vehicle performs a locking action for example with his key or his remote control. Under these conditions, the outer opening lever 12 passes into the position shown in Figure 8 and causes the opening of the lock in the manner already explained above.

If while the outer opening lever 12 is held in the open position shown in Figs. 8 and 9, the locking lever 16 is turned counterclockwise, as indicated by the arrow F3 in Fig. 9 , from the unlocking position to the locking position, the connecting rod 17 remains locked in the same position as that of FIG. 8. Indeed, when the external opening lever 12 is in the open position, the oblong light 28 of said lever 12 occupies a strongly oblique position relative to the direction of action of the traction force exerted on the link rod 17 by the locking lever 16 and the spring 21. As a result, one of the two longitudinal edges of the light 28 of the lever 12 retains the coupling pin 17b of said link rod, thus preventing the lock from passing into a condemned state.

However, as the connecting rod 17 remains blocked by the outer opening lever 12 during the rotation of the locking lever 16 in the direction of the arrow F3, the coupling pin 17a of said connecting rod retains the branch 21b of the spring 21 while the drive portions 26 and 27 of the locking lever 16 push the branch 21a of the spring 21 away from the branch 21b, as shown in Figure 10. It follows that, again, the spring 21 stores energy and thus memorizes the action of condemnation.

As soon as the user releases the handle or outer pallet of the door, the outer opening lever 12 is returned to its rest position by the spring 14, as shown in FIG. 11. In this position, the oblong slot 28 of the external opening lever 12 extends substantially in the direction of action of the traction force exerted on the connecting rod 17 by the branch 21b of the spring 21. As a result, the coupling pin 17b of said link rod link is free to move in the oblong slot 28, thus allowing the spring 21 to restore the condemnation energy it had stored during the rotation of the locking lever 16 in the direction of the arrow F3, in order to bring the connecting rod into the position shown in Figure 11. The lock is then in an open state, but potentially doomed. Indeed, if the door had been opened, it is then sufficient to slam the door so that the lock automatically goes into the closed and condemned state shown in Figure 12, that is to say in a situation identical to that shown in Figure 3.

It goes without saying that the embodiment of the invention which has been described above has been given by way of purely indicative and non-limiting example and that many modifications can easily be made by those skilled in the art. without departing from the scope of the invention.

For example, it is not absolutely essential that the branches 21a and 21b of the spring 21 are crossed. To do this, it suffices to use a helical torsion spring whose winding direction around the hub 16a of the locking lever 16 is reversed with respect to the winding direction of the spring 21 shown in FIG.

There is the advantage of using a spring with two branches, one of the branches 21a serves to drive the link rod 17 from its second inactive position to its first active position and the other of the two branches 21b is used to drive connecting rod 17 from its first active position to its second inactive position. Indeed, this arrangement makes it possible to economically and space-saving two functions at a time.

In addition, instead of using a helical torsion spring as an elastic device for storing a locking or locking energy, an elastic member, for example a helical compression spring, can be provided in the arcuate light 18 of each side of the coupling pin 17a, between the latter and each of the ends of said arcuate lumen. In this case, the elastic member may be prestressed in compression.

Although in the preceding description the lever 12 has been described as an external opening lever, it could be an internal opening lever intended to be connected by a force transmission member to a control member. interior opening (handle or inner pallet) of a motor vehicle door.

As a variant, the lever 12 could be an intermediate lever that can be actuated both by an external opening lever and by an opening lever inside a lock.

Claims (11)

1. Lock for motor vehicle doors and openings, comprising a mobile locking lever (16), moving between a first position corresponding to the lock's unlocked state and a second position corresponding to the lock's locked state, a linking rod (17), which, in response to a movement of locking lever (16) between its first and second position, moves between an active first position and an inactive second position, characterised in that it comprises an elastic device (21) for storing locking energy in case link rod (17) jams in its first active position, in order to automatically cause link rod (17) to move from its first active position to its second inactive position after link rod (17) has become unjammed.
2. Lock of claim 1, characterised in that elastic device (21) can also store unlocking energy in case link rod (17) jams, in order to automatically cause link rod (17) to move from its second inactive position to its first active position after link rod (17) has become unjammed.
3. Lock of claim 1 or 2, characterised in that elastic device (21) comprises a dual arm helical torsion spring (21 a, 21 b), connecting locking lever (16) directly to link rod (17).
4. Lock of claims 2 and 3 together, characterised in that one of the arms (21a) is used to move link rod (17) from its second inactive position to its first active position and that the other arm (21 b) is used to move link rod (17) from its first active position to its second inactive position.
5. Lock of any of claims 3 to 4, characterised in that both arms (21 a, 21 b) of the helical torsion spring (21) are crossed, when viewed in the axial direction.
6. Lock of claim 5, characterised in that locking lever (16) is essentially disk-shaped with a central hub (16a), an aperture (18) formed in said disk and which runs in a circular arc around a part of central hub (16a), and at least one drive part (26, 27) which protrudes on said disk face midway along at least one longitudinal edge of the arc-shaped aperture (18).
7. Lock of claim 6, characterised in that helical torsion spring (21) is distributed around the central hub (16a) of locking lever (16) such that the two arms (21a, 21 b) of said helical torsion spring (21) hold between them said drive part (26, 27) of locking lever (16) and pass radially through the arc-shaped aperture (18).
8. Lock of claim 7, characterised in that link rod (17) includes, at one of its ends, a first coupling stud (17a) which is inserted into the arched-shaped aperture (18) of locking lever (16) between the two arms (21 a, 21 b) of helical torsion spring (21), and at its other end, a second coupling stud (17b), which is inserted into an oblong aperture (28) formed lengthwise in an opening lever (12), whereby said oblong aperture (28) runs in a first direction that enables link rod (17) to move from its first to its second position when opening lever (12) is in resting position, and in a second direction, which prevents link rod (17) making said movement when opening lever (12) is in its open position.
9. Lock of any of claims 1 to 8, comprising a bolt (3), a catch (5) for holding the bolt in a position corresponding to the lock's closed states, and a mobile opening lever (12) controlled by an opening command means (13) such as to move between the lock's resting position and its open position of, characterised in that the lock in addition includes a false catch (8) and that catch (5), false catch (8) and opening lever (12) are assembled in this order on a common pivoting pin (6), such false catch (8) rotates jointly with catch (5) and includes a lug (8a) on which the second coupling stud (17b) of the link rod (17) acts in order to cause false catch (8) and catch (5) to move to the bolt's (3) release position when link rod (17) is in its first position and opening lever (12) has moved from the resting position to the open position.
10. Lock of claim 9, characterised in that lug (8a) includes a resting surface (29) designed to act as said locking component (29).
11. Lock of any of claims 9 to 10, characterised in that opening lever (12) is an external opening lever intended to be connected by means of a force transmission component (13) to an external opening control component of a motor vehicle door.

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