FR3136803A1 - Locking mechanism by pressing an opening against a frame - Google Patents

Abstract

Title: Locking mechanism by pressing an opening against a frame The invention relates to a mechanism (1) for locking an opening (2) by pressing against a frame (3), comprising: - a frame (4); - a carriage (5);- a hook (6) movable relative to the frame (4);- an actuator (7), - a return element (8) interposed between the actuator (7) and the carriage (5) ), characterized in that the return element (8) is configured to tighten when the carriage (5) moves from a first position to a second position and move the hook (6), then press the opening ( 2) against the frame (3) by cooperation of the actuator (7) with the hook (6). Figure for abstract: Fig. 1

Description

Locking mechanism by pressing an opening against a frame

The field of the invention is that of the design and manufacture of locking mechanisms.

More precisely, the invention relates in particular, but not exclusively, to a locking mechanism by pressing an opening against a frame.

The locking mechanism according to the invention is particularly suitable for a case composed of a body (forming a frame) and a cover (forming an opening) movable relative to the body.

Thus the locking mechanism according to the invention makes it possible to secure the case, and in particular to prevent the cover from opening in relation to the body.

There are different mechanisms for locking an opening against a frame.

In the field of briefcases, there are mainly two types of locking mechanisms.

The first type of locking mechanism has two digital combination locks placed on either side of the briefcase handle. Each lock comprises a coupling member intended to be fixed to the body and a part comprising a lock fixed to the cover and capable of cooperating with the coupling member for locking the cover against the body.

The second type of locking mechanism is similar to the mechanism of a traditional key lock, well known to those skilled in the art.

Classically, the case has two locks placed on either side of the grip handle.

These two types of mechanism have several disadvantages.

On the one hand, the locks are accessible from the outside of the case and generally have insufficient mechanical strength to guarantee the security of the contents of the case.

The locks on the case can, therefore, be forced by malicious individuals wishing to access the contents of the case.

On the other hand, the arrangement of the locking mechanism, accessible from outside the case, harms the aesthetics of the case.

To overcome the aforementioned drawbacks, a mechanism allowing the opening to be pressed against the frame, in order to lock it, has been developed.

• un bâti destiné à être solidarisé au dormant ;
• un charriot destiné à être solidarisé à l’ouvrant et mobile par rapport au bâti, selon un mouvement de translation entre une première position correspondant à une position ouverte de l’ouvrant, et une deuxième position correspondant à une position de blocage de l’ouvrant ;
• un crochet mobile par rapport au bâti et agencé pour coopérer avec une partie de l’ouvrant afin de le plaquer contre le dormant ;
• un actionneur monté à rotation sur le bâti et agencé pour déplacer le crochet,
• un élément de rappel intercalé entre l’actionneur et le charriot.

This locking mechanism includes:

• a frame intended to be secured to the frame;
• a carriage intended to be secured to the opening and movable relative to the frame, in a translational movement between a first position corresponding to an open position of the opening, and a second position corresponding to a blocking position of the opening ;
• a hook movable relative to the frame and arranged to cooperate with a part of the opening in order to press it against the frame;
• an actuator mounted to rotate on the frame and arranged to move the hook,
• a return element inserted between the actuator and the carriage.

The connection between the hook and the actuator is in particular of the pivot type, which allows, through the presence of the return element, to exert a force of pressing the opening against the frame via the hook which is rotated by the actuator.

However, such a mechanism remains perfectible.

In fact, the use of pivot connections can cause the locking mechanism to buckle in the event of too much effort.

Furthermore, the pivot connections generate significant mechanical fatigue requiring recurring preventive maintenance to avoid any problem of malfunction of the locking mechanism.

However, for cases that must be used daily by their users, such maintenance proves detrimental.

The invention aims in particular to overcome the disadvantages of the prior art.

More precisely, the invention aims to propose a locking mechanism whose reliability is increased, in particular with regard to resistance to the significant forces exerted on the cover.

The invention also aims to provide such a locking mechanism requiring little maintenance for its operation.

The invention further aims to provide such a locking mechanism with increased security, particularly with regard to resistance to shocks intended to fraudulently open the locking mechanism.

These objectives, as well as others which will appear subsequently, are achieved thanks to the invention which relates to a mechanism for locking an opening by pressing against a frame, comprising:
- a frame intended to be secured to the frame;
- a carriage intended to be secured to the opening, and movable relative to the frame in a translational movement between a first position corresponding to an open position of the opening, and a second position corresponding to a blocking position of the opening opening;
- a hook movable relative to the frame and arranged to cooperate with a part of the opening in order to press it against the frame;
- an actuator mounted to rotate on the frame and arranged to move the hook,
- a return element inserted between the actuator and the carriage,
characterized in that the hook is movable in rotation on the frame and has a first cam path and a second cam path with which the actuator cooperates, the first cam path extending the second cam path,
and in that the return element is configured to tighten when the carriage moves from its first position to its second position and move the hook resting on the carriage by cooperation of the actuator with the first cam path, then press the opening against the frame by cooperation of the actuator with the second cam path, to cause the pivoting of the hook which then cooperates with said part of the opening to press it against the frame.

Thanks to the first cam path and the second cam path, the movement of the hook is achieved by sliding the actuator on the cam paths.

Therefore, in the event of significant force on the opening, the risk of bracing is eliminated, which ensures the operation of the mechanism once the significant force is released.

Finally, wear of the mechanism is considerably reduced by the use of a slide connection, that is to say by the sliding of the actuator on the cam paths, compared to a pivot connection.

According to an advantageous aspect, the locking mechanism comprises a second return element inserted between the actuator and the hook.

The second return element keeps the actuator in contact against the first cam path and the second cam path.

Thus, in the event of shaking during use, the locking mechanism remains functional.

According to an advantageous aspect, the locking mechanism also comprises a connector inserted between the carriage and the actuator, the return element being connected by a first end to the actuator, and by a second end to the connector.

The connector ensures reversibility of the locking mechanism, that is to say a reset when the carriage moves from its second position to its first position.

In other words, when the opening is moved away from the frame, the locking mechanism is armed to allow future locking.

According to an advantageous aspect, the connector comprises:
- a rocker extending the actuator;
- a first connecting rod mounted to rotate on the rocker, and
- a second connecting rod inserted between the first connecting rod and the carriage,
the second connecting rod being articulated relative to the first connecting rod by a pivot connection, and the second end of the return element being connected to the rocker.

This configuration of the connector makes it possible to create a knee-type connection, that is to say a disengageable connection, to ensure the tension of the return element when the carriage passes from its first position to its second position, or to ensure an absence of tension in the return element when the carriage moves from its second position to its first position.

Indeed, tensioning the return element when the carriage moves from its second position to its first position would prevent the resetting of the locking mechanism by countering the rotation of the hook.

According to an advantageous aspect, the rocker is mounted to rotate relative to the actuator, and is movable between a position spaced from the actuator intended to tension the return element when moving the carriage from its first position to its second position , and an actuator driving position in which it pivots the actuator when moving the carriage from its second position to its first position.

The spread position allows the tension of the return element while the drive position ensures the reset of the locking mechanism.

In other words, when the rocker is without its separated position, the return element can tighten to allow the actuator to move the hook in order to press the opening against the frame, while in its position drive, the rocker prevents tension in the return element and rotates the hook to allow the release of the sash.

According to an advantageous aspect, the locking mechanism comprises a third return element inserted between the carriage and the second connecting rod, the third return element being configured to position the first connecting rod and the second connecting rod in a force transmission position of the carriage to the rocker when moving the carriage from its first position to its second position.

This third return element ensures that the first connecting rod and the second connecting rod are correctly aligned to allow the tension of the return element when the carriage passes from its first position to its second position, which then ensures locking by plating of the opening against the frame.

According to an advantageous aspect, the locking mechanism also comprises a pusher secured to the frame, the pusher being configured to act on the pivot connection and cause a misalignment of the first connecting rod relative to the second connecting rod and cause the passage of the rocker from its separated position to its driving position, prior to moving the carriage from its second position to its first position.

The pusher makes it possible to break the tension of the return element in order to facilitate the removal of the hook by the effect of the second return element. This then ensures the movement of the hook and therefore the spacing of the opening relative to the frame.

In other words, when the pusher acts on the pivot connection, the return element is no longer in tension, which allows the hook to pivot to release the sash.

According to an advantageous aspect, the locking mechanism also comprises a protective weight, pivotally mounted on the frame, the protective weight being configured to exert a retaining force on the pusher in the event of an impact.

The protective weight helps prevent the pusher from coming out in the event of shocks that could cause the pusher to come out undesirably. In addition, this avoids disengagement of the hook which would then make it possible to move the opening relative to the frame.

According to an advantageous aspect, the return element, the second return element and/or the third return element are in the form of a tension spring.

The use of tension springs makes it possible to obtain a purely mechanical locking mechanism, therefore energy efficient and not requiring dedicated control.

According to an advantageous aspect, the locking mechanism also comprises motor means intended to push the carriage from its second position towards its first position.

The motor means ensure automatic raising of the sash using the trolley.

In other words, the motor means allow the carriage to be raised, and therefore the locking mechanism to be reset when the opening is moved away from the frame.

According to an advantageous aspect, the actuator comprises a roller having a central portion and two ears each extending on either side of the central portion, the ears being intended to be located on either side of the hook, and the central portion being intended to cooperate with the first cam path and the second cam path.

The ears help guide the relative movement between the actuator and the hook, and prevent any disengagement of the actuator from the hook.

The reliability of the locking mechanism is thus increased by the design of the roller.

The invention also relates to a case comprising a body defining a frame, and a cover forming an opening, the cover being intended to close the body, characterized in that the case also comprises a locking mechanism as previously described.

Such a case is thus secured by the presence of the locking mechanism.

Additionally, the locking mechanism is built into the case, and therefore inaccessible from outside the case, making it difficult, if not impossible, to force.

According to an advantageous aspect, the case also includes a trigger mechanism configured to cause the carriage to move from its second position to its first position.

By activating the release mechanism, the sash can be moved away from the frame, and the locking mechanism can be reset for future locking.

• la est une vue en perspective avant d’un mécanisme de verrouillage selon l’invention ;
• la est une vue en perspective avant du mécanisme de verrouillage selon l’invention ;
• la est une vue en perspective de dessous d’un actionneur du mécanisme de verrouillage selon l’invention ;
• la est une vue de côté d’un crochet du mécanisme de verrouillage selon l’invention ;
• la est une vue en coupe transversale illustrant le mécanisme de verrouillage selon l’invention dans un premier état d’une procédure de verrouillage ;
• la est une vue en coupe transversale illustrant le mécanisme de verrouillage selon l’invention dans un premier état d’une procédure de verrouillage ;
• la est une vue en coupe transversale illustrant le mécanisme de verrouillage selon l’invention dans un troisième état d’une procédure de verrouillage ;
• la est une vue en coupe transversale illustrant le mécanisme de verrouillage selon l’invention, dans une position de verrouillage ;
• la est une vue en coupe transversale illustrant le mécanisme de verrouillage selon l’invention dans un premier état d’une procédure de déverrouillage ;
• la est une vue en coupe transversale illustrant le mécanisme de verrouillage selon l’invention dans un deuxième état d’une procédure de déverrouillage ;
• la est une vue en coupe transversale illustrant le mécanisme de verrouillage selon l’invention dans un troisième état d’une procédure de déverrouillage,
• la est une représentation schématique en perspective de dessus d’une mallette intégrant un mécanisme de verrouillage selon l’invention pour la fermeture par plaquage d’un couvercle, formant ouvrant, contre un corps de la mallette, formant dormant.

Other characteristics and advantages of the invention will appear more clearly on reading the following description of a preferred embodiment of the invention, given by way of illustrative and non-limiting example, and the appended drawings among which:

• there is a front perspective view of a locking mechanism according to the invention;
• there is a front perspective view of the locking mechanism according to the invention;
• there is a bottom perspective view of an actuator of the locking mechanism according to the invention;
• there is a side view of a hook of the locking mechanism according to the invention;
• there is a cross-sectional view illustrating the locking mechanism according to the invention in a first state of a locking procedure;
• there is a cross-sectional view illustrating the locking mechanism according to the invention in a first state of a locking procedure;
• there is a cross-sectional view illustrating the locking mechanism according to the invention in a third state of a locking procedure;
• there is a cross-sectional view illustrating the locking mechanism according to the invention, in a locking position;
• there is a cross-sectional view illustrating the locking mechanism according to the invention in a first state of an unlocking procedure;
• there is a cross-sectional view illustrating the locking mechanism according to the invention in a second state of an unlocking procedure;
• there is a cross-sectional view illustrating the locking mechanism according to the invention in a third state of an unlocking procedure,
• there is a schematic representation in perspective from above of a case integrating a locking mechanism according to the invention for closing by pressing a cover, forming an opening, against a body of the case, forming a frame.

With reference to Figures 1 and 2, a locking mechanism 1 according to the invention is shown.

This locking mechanism 1 is particularly suitable for an M case as illustrated on the .

Such a case M comprises in particular a body M1 forming a frame 3 and a cover M2 forming an opening 2 movable relative to the frame 3.

The locking mechanism 1 according to the invention makes it possible to lock the opening 2 by pressing it against the frame 3.

• un bâti 4 destiné à être solidarisé au dormant 3 ;
• un charriot 5 destiné à être solidarisé à l’ouvrant 2 ;
• un crochet 6 mobile par rapport au bâti 4, et agencé pour coopérer avec une partie 21 de l’ouvrant 2 afin de le plaquer contre le dormant 3, comme expliqué ci-après ;
• un actionneur 7 monté à rotation sur le bâti 4 et agencé pour déplacer le crochet 6 ;
• un élément de rappel 8 intercalé entre l’actionneur 7 et le charriot 5.

With reference to Figures 1 and 2, the locking mechanism 1 comprises:

• a frame 4 intended to be secured to the frame 3;
• a carriage 5 intended to be secured to the opening 2;
• a hook 6 movable relative to the frame 4, and arranged to cooperate with a part 21 of the opening 2 in order to press it against the frame 3, as explained below;
• an actuator 7 rotatably mounted on the frame 4 and arranged to move the hook 6;
• a return element 8 interposed between the actuator 7 and the carriage 5.

The carriage 5 is movable relative to the frame 4 in a translational movement between a first position corresponding to an open position of the opening 2 and a second position corresponding to a blocking position of the opening 2.

The first position of the carriage 5 is illustrated in particular on the and the second position of the carriage 5 is illustrated on the .

In reference to the , the actuator 7 comprises a roller 71 having a central portion 72 and two ears 73 each extending on either side of the central portion 72.

The two ears 73 thus form a fork inside which the central portion 72 is located.

The ears 73 are thus intended to be located on either side of the hook 6.

In other words, the hook 6 is received between the two lugs 73 of the actuator 7.

In reference to the , hook 6 is now described.

The hook 6 comprises a retaining portion 61 intended to cooperate with part 21 of the opening 2 to allow the pressing of the opening 2 against the frame 3, as explained below.

In addition, the hook 6 has a first cam path 62 and a second cam path 63. The first cam path 62 and the second cam path 63 allow cooperation between the hook 6 and the actuator 7 as described below. -After.

In addition, the hook 6 carries a shoe 64 whose role is explained below.

Like actuator 7, hook 6 is rotatably mounted on frame 3.

The actuator 7 thus cooperates with each of the first cam path 62 and the second cam path 63 to pivot the hook 6 relative to the frame 4.

More particularly, as seen on the , the first cam path 62 and the second cam path 63 are an extension of one another. In other words, the second cam path 63 extends the first cam path 62.

As illustrated in Figures 5 to 11, the return element 8 is inserted between the actuator 7 and the carriage 5.

More particularly, the locking mechanism 1 also includes a connector 9 interposed between the carriage 5 and the actuator 7.

The return element 8 is thus connected by a first end 81 to the actuator 7 and by a second end 82 to the connector 9. The first end 81 of the return element 8 is more precisely connected to a tab 74 curved by the actuator 7.

• une bascule 91, prolongeant l’actionneur 7 ;
• une première bielle 92 montée à rotation sur la bascule 91, et
• une deuxième bielle 93 intercalée entre la première bielle 92 et le charriot 5.

Still with reference to Figures 5 to 11, connector 9 includes:

• a rocker 91, extending the actuator 7;
• a first connecting rod 92 rotatably mounted on the rocker 91, and
• a second connecting rod 93 inserted between the first connecting rod 92 and the carriage 5.

The second connecting rod 93 is articulated relative to the first connecting rod 92 by a pivot connection P.

As illustrated in Figures 5 to 11, the second end 82 of the return element 8 is connected to the rocker 91. More specifically, the second end 82 of the return element 8 is connected to a claw 911 of the rocker 91.

The rocker 91 is also mounted to rotate relative to the frame 4.

In addition, as can be seen in Figures 5 and 6, the rocker 91 is mounted to rotate relative to the actuator 7.

The rocker 91 is thus movable, relative to the actuator 7, between a position separated from the actuator 7, intended to tension the return element 8, and a driving position of the actuator 7 in which the rocker 91 rotates the actuator 7.

In other words, in the separated position, the rocker 91 can pivot relative to the actuator 7, while in the driving position, the rocker 91 carries with it the actuator 7 during its pivoting.

In reference to the , the locking mechanism 1 also comprises a second return element 10 inserted between the actuator 7 and the hook 6.

This second return element 10 tends to bring the actuator 7 closer to the hook 6 to maintain cooperation between the actuator 7 and the hook 6.

As illustrated by the , the locking mechanism 1 also includes a third return element 11 inserted between the carriage 5 and the second connecting rod 93.

As will be described subsequently, the third return element 11 is configured to position the first connecting rod 92 and the second connecting rod 93 in a position for transmitting force from the carriage 5 to the rocker 91 during movement of the carriage.

According to the embodiment illustrated in Figures 1 to 11, the return element 8, the second return element 10 and/or the third return element 11 are in the form of tension springs.

Locking by pressing an opening 2 against a frame 3 using the locking mechanism 1 is done as follows.

The carriage 5, which is integral with the opening 2, is moved according to its translation movement (illustrated by the arrow T on the ) from its first position illustrated by the towards its second position illustrated by the .

During its movement, the carriage 5 causes the rotational movement of the rocker 91 relative to the frame 4 via the first connecting rod 92 and the second connecting rod 93.

In reference to the , when the carriage 5 is translated relative to the frame 4, the movement of the rocker 91 causes the tensioning of the return element 8.

Consequently, the return element 8, which then tends to recover a relaxed configuration, causes the rotation of the actuator 7 relative to the frame 4.

The rotation of the actuator 7 then causes, by cooperation between the central portion 72 of the roller 71 and the first cam path 62, the movement of the hook 6.

In a first part of the translation movement of the carriage 5, the hook 6, via its shoe 64, rests against the carriage 5.

In the first part of the translation movement of the carriage 5, the hook 6 does not pivot relative to the frame 4.

Indeed, during the first part of the translation movement of the carriage 5, the hook 6 rests against the carriage 5, via its shoe 64.

In other words, when the central part 72 of the actuator 7 cooperates with the first cam path 62, the rotation of the hook 6 is low, for example, less than 2°.

When the pad 64 is no longer supported on the carriage 5, the hook 6 pivots relative to the frame 4 so that its retaining portion 61 can cooperate with the part 21 of the opening 2. The cooperation of the portion of retainer 61 with part 21 of the opening causes the opening 2 to be pressed against the frame 3.

The pressing of the opening 2 on the frame 3 is then done according to a movement parallel to the movement of the carriage 5, that is to say according to a translation movement.

When the carriage 5 no longer blocks the rotation of the hook 6 by cooperation with the shoe 64, the hook 6 pivots relative to the frame 4 as illustrated by the difference in position of the hook 6 between Figures 7 and 8.

The rotation of the hook 6 is allowed by the actuator 7, and more particularly by the central portion 72 of the roller 71 which then cooperates with the second cam path 63.

The movement of the hook 6 in rotation relative to the frame 4 then causes the tensioning of the second return element 10 between the hook 6 and the actuator 7.

In reference to the , the hook 6 is in a configuration in which it holds the opening 2 pressed against the frame 3 by cooperation of the retaining portion 61 with the part 21 of the opening 2.

To enable the hook 6 to be disengaged, and therefore the opening 2 to be opened relative to the frame 3, the locking mechanism 1 also includes a pusher 12 secured to the frame 4.

The pusher 12 is configured to act on the pivot connection P between the second connecting rod 93 and the first connecting rod 92 to cause a misalignment of the first connecting rod 92 relative to the second connecting rod 93.

This misalignment causes the rocker 91 to move from its spaced position to its drive position.

The driving position of the rocker 91 is maintained by means of the return element 8, which tends to recover an untensioned configuration.

The second return element 10, which is tensioned when the rocker 91 is in its separated position, then tends to recover an untensioned configuration. This then causes the actuator 7 to move relative to the hook 6, and in particular the central portion 72 of the roller 71 to slide against the second cam path 63, then against the first cam path 61.

This sliding movement of the actuator 7 relative to the hook 6 then causes a rotation of the hook 6 which disengages from part 21 of the opening 2.

The opening 2 is thus released from its pressing against the frame 3.

The carriage 5 can then be raised from its second position to its first position by means of motor means 13.

The motor means 13 are for example integral with the frame 4, and allow the carriage 5 to move relative to the frame 4 from its second position to its first position.

Moving the carriage 5 from its second position to its first position then causes a realignment of the second connecting rod 93 relative to the first connecting rod 92, which has the effect of resetting the locking mechanism 1.

Indeed, the alignment of the first connecting rod 92 with the second connecting rod 93 allows force to be transmitted from the carriage 5 to the rocker 91 when the carriage 5 moves from its first position to its second position, that is to say when closing the opening 2.

In order to prevent any unwanted opening of the opening 2 in relation to the frame 3, the locking mechanism 1 comprises a protective flyweight 14 pivotally mounted on the frame 4.

The protective flyweight 14 is configured to exert a retaining force on the pusher 12 in the event of an impact in an exit direction of the pusher 12 against the pivot connection P.

More precisely, the protective flyweight 14 is mounted in such a way that its center of gravity is offset relative to an axis of rotation of the flyweight 14 relative to the frame 4. Thus, the flyweight 14 is pre-stressed in rotation and has a tail 141 which is pushed back against pusher 12.

The pusher 12 is in particular controlled by ad hoc control means making it possible to generate, for example by an electric current, an output from the pusher 12 to misalign the first connecting rod 92 relative to the second connecting rod 93 at the level of the pivot connection P.

In reference to the , when the locking mechanism 1 is integrated into a case M, the frame 4 is then secured to the body M1 of the case M.

The case M then also includes a trigger mechanism configured to cause the carriage 5 to move from its second position to the first position via the motor means 13.

In addition, the trigger mechanism 1 integrates the ad hoc control means which make it possible to generate the output of the pusher 12 in order to release the opening 2.

Claims (13)

Mechanism (1) for locking an opening (2) by pressing against a frame (3), comprising:
- a frame (4) intended to be secured to the frame (3);
- a carriage (5) intended to be secured to the opening (2), and movable relative to the frame (4) in a translational movement between a first position corresponding to an open position of the opening (2), and a second position corresponding to a blocking position of the opening (2);
- a hook (6) movable relative to the frame (4) and arranged to cooperate with a part (21) of the opening (2) in order to press it against the frame (3);
- an actuator (7) rotatably mounted on the frame (4) and arranged to move the hook (6),
- a return element (8) inserted between the actuator (7) and the carriage (5),
characterized in that the hook (6) is rotatably movable on the frame (4) and has a first cam path (62) and a second cam path (63) with which the actuator (7) cooperates, the first cam path (62) extending the second cam path (63),
and in that the return element (8) is configured to tighten when the carriage (5) moves from its first position to its second position and move the hook (6) resting on the carriage (5) by cooperation of the actuator (7) with the first cam path (62), then press the opening (2) against the frame (3) by cooperation of the actuator (7) with the second cam path (63), to cause the pivoting of the hook (6) which then cooperates with said part (21) of the opening (2) to press it against the frame (3). Locking mechanism (1) according to claim 1, characterized in that it comprises a second return element (10) inserted between the actuator (7) and the hook (6). Locking mechanism (1) according to any one of the preceding claims, characterized in that it also comprises a connector (9) inserted between the carriage (5) and the actuator (7), the return element (8 ) being connected by a first end (81) to the actuator (7), and by a second end (82) to the connector (9). Locking mechanism (1) according to the preceding claim, characterized in that the connector (9) comprises:
- a rocker (91) extending the actuator (7);
- a first connecting rod (92) rotatably mounted on the rocker (91), and
- a second connecting rod (93) inserted between the first connecting rod (92) and the carriage (5),
the second connecting rod (93) being articulated relative to the first connecting rod (92) by a pivot connection (P), and the second end (82) of the return element (8) being connected to the rocker (91). Locking mechanism (1) according to the preceding claim, characterized in that the rocker (91) is mounted to rotate relative to the actuator (7), and is movable between a position spaced from the actuator (7) intended to tensioning the return element (8) when moving the carriage (5) from its first position to its second position, and a driving position of the actuator (7) in which it pivots the actuator (7) when moving the carriage (5) from its second position to its first position. Locking mechanism (1) according to the preceding claim, characterized in that it comprises a third return element (11) inserted between the carriage (5) and the second connecting rod (93), the third return element (11) being configured to position the first connecting rod (92) and the second connecting rod (93) in a position for transmitting force from the carriage (5) to the rocker (91) during movement of the carriage (5) from its first position to its second position. Locking mechanism (1) according to the preceding claim, characterized in that it also comprises a pusher (12) secured to the frame (4), the pusher (12) being configured to act on the pivot connection (P) and cause a misalignment of the first connecting rod (92) relative to the second connecting rod (93) and causing the rocker (91) to move from its spaced position to its driving position, prior to moving the carriage (5) from its second position to its first position. Locking mechanism (1) according to the preceding claim, characterized in that it also comprises a protective flyweight (14), pivotally mounted on the frame (4), the protective flyweight (14) being configured to exert a force retaining the pusher (12) in the event of an impact. Locking mechanism (1) according to any one of the preceding claims, characterized in that the return element (8), the second return element (10) and/or the third return element (11) are in the form of the shape of a tension spring. Locking mechanism (1) according to any one of the preceding claims, characterized in that it also comprises motor means (13) intended to push the carriage (5) from its second position towards its first position. Locking mechanism (1) according to any one of the preceding claims, characterized in that the actuator (7) comprises a roller (71) having a central portion (72) and two ears (73) each extending on either side and on the other side of the central portion (72), the ears (73) being intended to be located on either side of the hook (6), and the central portion (72) being intended to cooperate with the first path of cam (62) and the second cam path (63). Case (M) comprising a body (M1) defining a frame (3), and a cover (M2) forming an opening (2), the cover (M2) being intended to close the body (M1), characterized in that the briefcase (M) also comprises a locking mechanism (1) according to any one of the preceding claims. Case (M) according to the preceding claim, characterized in that it also comprises a trigger mechanism configured to cause the carriage (4) to move from its second position to its first position.