EP2534970B1 - Triple-opening clasp - Google Patents

Description

Field of the invention

The invention relates to a triple safety clasp deploying for the maintenance of two ends of a bracelet or strap, said clasp having a loop hingedly articulated on both sides of a first strand and a second strand each carrying a pin, respectively an eye, shoulder and shouldered arranged to cooperate in a closed position of said clasp with an eye, respectively a pin, complementary locking that includes said loop, and said loop comprising a first pusher and a second pusher movable in the same direction and each against elastic return means reminding them to a locking position and each arranged to directly or indirectly control the advance or withdrawal of two bolts, which are antagonistic according to said direction to opposite bolts controlled by the other of said pushers, each said bolt being arranged to immobilize in said closed position , at said eye, respectively pion, complementary locking, a clearance that includes said pin, eye respectively, lock, and the individual stroke of each of said pushers being less than a release stroke in which at least two opposing bolts release in an open position, said clearance of at least one of said pins respectively eye, locking, and the cumulative stroke of said pushers being greater than or equal to said release stroke.

The invention also relates to a bracelet comprising such a clasp.

The invention relates to the field of fastening objects, in particular to the person, and more particularly relates to the fields of watchmaking, jewelery, and jewelry.

The invention will be described more specifically for the field of watch-jewelery, for the closure of bracelets or watchbands.

Background of the Invention

Many clasps for bracelets are known, in particular for wristwatches or for jewelery, comprising deploying movable strands.

In many so-called triple clasps, that is to say having two strands articulated on a loop on which they are folded, each strand having a pin cooperating in a locking position with an eye of the loop, the loop is equipped two pushers mounted elastically. Often, the pressure on one of the two pushers can trigger the opening of the clasp, which is not satisfactory from the security point of view. In the same way, it is common that, after the locking of a first strand, the closure of the other strand has the effect, by removing the pushers, to release the strand that was already locked and which provided temporary security. This last defect has been solved by some manufacturers by the imposition of a sequential closure of the strands in an imposed order, which is inconvenient for the user.

Different clasp devices provide solutions to this problem. So the document CH 670 941 In the name of CORNU & CIE SA discloses a clasp with a small number of components, using the elastic deformation of tuning fork-shaped tappets, the ends of which form retaining stops for the strands. The document EP 0 549 846 in the name of GTF SRL describes a bolt comprising bolts, comprising concave tracks on which a V-shaped spring is supported, which project out of a casing to cooperate with hooks that comprise the strands, and for unlocking, a single pusher pushes ramps that include these bolts, against the spring that works buckling. The document JP 9000320 in the name of CITIZEN describes a clasp with four bolts each provided with a cam in the form of ramp, and opposed two by two by springs, and maneuvered against these springs by two pushers each having two opposing ramps.

The document CN201278878Y in the name of HUADONG GUAN presents a clasp with two pushers pushed by a first spring, each carrying two claws pushed outward by a spring perpendicular to the first spring.

In short, the proposed solutions often prove to be complex or fragile, because they are based essentially on the elasticity of certain components.

Summary of the invention

The invention proposes to make a safety clasp, to guard against inadvertent opening, or against reopening, when for example after a clasp strand has already been folded and a first pin locked on the loop, the closing the second strand and the introduction of the pin it carries causes the unlocking of the first piece, the reopening of the clasp, or even the fall of the watch or the object related to the bracelet.

For this purpose, the invention relates to a triple safety clasp deploying for the maintenance of two ends of a bracelet or strap, said clasp having a loop hingedly hinged on both sides of a first strand and a second strand, each carrying a pin, respectively an eye, with a shoulder and a shoulder adapted to cooperate in a closed position of said clasp with an eye, respectively a pin, of complementary locking that comprises said loop, and said loop having a first pusher and a second pusher movable in the same direction and each against resilient biasing means reminding them to a locking position and each arranged to directly or indirectly control the advance or withdrawal of two bolts, which are antagonistic in said direction to opposite bolts controlled by the other of said pushers, each said bolt being arranged to immobilize in said closed position, at said eye, respectively pin, complementary locking, a clearance that includes said pin, eye respectively, lock, and the individual stroke of each of said pushers being less than a release stroke wherein at least two opposing bolts release in an open position said clearance of at least one of said pins respectively eye, locking, and the cumulative stroke of said pushers being greater than or equal to said release stroke, characterized in that said first pusher drives directly, severally and simultaneously a first primary bolt facing a first pawn, eye respectively, locking, and a second primary bolt facing a second pawn, respectively eye, locking, while said second pusher independently drives a first bolt secondary to said first pion, eye respectively, locking, and a second secondary bolt facing said second pawn, eye respectively, locking, so that only the cumulative actuation of said two pushers causes the movement of all the bolts in all of their release stroke for releasing both said first pin and said second pin, respectively oeils, locking, and so that one of said two secondary bolts remains in the locking return position during the insertion of one of said pins, respectively eyelids, locking towards said eye, respectively pawn, complementary locking corresponding thereto, to take a positi we lock.

According to one characteristic of the invention, said second pusher is arranged for, during a pressure exerted by the user, to push in said direction, by a bearing surface that includes said second pusher, a first bearing surface of said first secondary bolt, and a second bearing surface of said second secondary bolt, so as to move said first secondary bolt and said second secondary bolt parallel to each other.

According to another characteristic of the invention, in the absence of action of the user on one of the pushers, said first secondary bolt and said second secondary bolt are movable independently of one another against resilient return means.

According to another characteristic of the invention, a said first eye, respectively pawn, of complementary locking, is delimited by the cooperation of said first primary bolt and said first secondary bolt, and a said second eye, respectively pawn, complementary locking, is delimited by the cooperation of said second primary bolt and said second secondary bolt, and each said eye, respectively pawn, complementary locking, constitutes a variable volume chamber, between an open position in which it is likely to leave the passage to a head that includes said pin, respectively eye, lock, which corresponds to it, and a closed position in which it is likely to grip said clearance of a said pin, respectively eye, lock, which corresponds to it, between jaws constituted by bearing faces that comprise said bolts concerned, while immobilizing said head of opposite side to said strand supporting said pin, respectively eye, locking, concerned, with respect to said jaws.

The invention also relates to a bracelet comprising such a clasp.

Brief description of the drawings

• la figure 1 représente, de façon schématisée, partielle et en perspective, un bracelet muni d'un fermoir selon l'invention, avec deux brins articulés sur une boucle en renfermant le mécanisme commandé par deux poussoirs sensiblement coplanaires;
• la figure 2 représente, de façon schématisée, partielle, et en section en vue de dessus dans un plan commun et sensiblement médian à ces deux poussoirs, la partie centrale du fermoir selon l'invention, dans une position stable de verrouillage de deux pions liés chacun à l'un des deux brins;
• la figure 3 représente, de façon analogue à la figure 2, le même mécanisme dans une position transitoire correspondant à un enfoncement complet des deux poussoirs et à une liberté d'introduction ou d'extraction des deux pions par rapport au fermoir ;
• les figures 4 et 5 représente chacune, en vue de côté, un détail de constitution des deux pions fixés à leurs brins respectifs ;
• la figure 6 représente, de façon schématisée, partielle et en perspective, et en vue de dessus le même fermoir dans la position de la figure 2, équipé avec des ressorts de rappel tendant à éloigner les deux poussoirs l'un de l'autre ;
• la figure 7 représente, de façon schématisée, partielle et en vue de dessus, une variante du fermoir de la figure 2 comportant des faces d'appui particulières équipant des pênes de manoeuvre commandés par les poussoirs ;
• la figure 8 représente la vue de dessous correspondant à la figure 7 ;
• la figure 9, similaire à la figure 7, fait apparaître une garde à l'ouverture du fermoir ;
• la figure 10 représente la vue de dessous correspondant à la figure 9.

The invention will be better understood on reading the detailed description which follows, with reference to the appended drawings, in which:

• the figure 1 represents, schematically, partially and in perspective, a bracelet provided with a clasp according to the invention, with two strands articulated on a loop by enclosing the mechanism controlled by two substantially coplanar pushers;
• the figure 2 represents, schematically, partially, and in section in plan view in a common plane and substantially median to these two pushers, the central part of the clasp according to the invention, in a stable position of locking two pins each connected to the one of the two strands;
• the figure 3 represents, in a similar way to figure 2 the same mechanism in a transient position corresponding to a complete depression of the two pushers and a freedom of introduction or extraction of the two pins relative to the clasp;
• the Figures 4 and 5 each represents, in side view, a detail of constitution of the two pins fixed to their respective strands;
• the figure 6 represents, schematically, partially and in perspective, and in view from above the same clasp in the position of the figure 2 equipped with return springs tending to move the two pushers away from each other;
• the figure 7 represents, schematically, partially and in top view, a variant of the clasp of the figure 2 having particular bearing faces equipping operating bolts controlled by the pushers;
• the figure 8 represents the bottom view corresponding to the figure 7 ;
• the figure 9 , similar to figure 7 , shows a guard at the opening of the clasp;
• the figure 10 represents the bottom view corresponding to the figure 9 .

Detailed Description of the Preferred Embodiments

The invention relates to the field of fastening objects, in particular to the person, and more particularly relates to the fields of watchmaking, jewelery, and jewelry.

The invention will be described more specifically for the field of watch-jewelery, for the closure of bracelets or watchbands.

The invention relates to a clasp 1 triple deploying security for the maintenance of two ends 200, 300 of a bracelet 100 or a strap. This strap is understood in the broad sense, it can be a harness, a belt, a load securing strap, or other.

The present description relates more specifically to a clasp 1 for a wristwatch or bracelet 100, but this preferred application is in no way limiting.

This clasp 1 comprises, as visible on the figure 1 , a loop 10 surrounded on both sides and in an articulated manner, by articulation means 4 and 5, such as hinge or the like, of a first strand 2 and a second strand 3 themselves related to 200, 300 ends of the bracelet 100, each carrying a pin 6, 7 locking. The invention is illustrated with this configuration of projecting pins, but it is applicable similarly to a mirror construction where the pieces are replaced by eyes, and where the eyes are replaced by pins.

Each pin 6, 7, respectively eye, locking, is preferably, as visible on the Figures 4 and 5 shoulder, comprising a head 6B, 7B, and a clearance 6A, 7A, of smaller diameter or size than that of this head 6B, 7B, and is arranged to cooperate in a closed position of the clasp 1 with an eye 8, 9, respectively a pin, complementary locking that includes the loop 10.

This loop 10 comprises a first pusher 11 and a second pusher 12 movable in the same direction D and each against elastic return means 13, 14 reminding them to a locking position, and each arranged to directly or indirectly control advance or withdrawal of two bolts 15, 16 for the first pusher 11, two bolts 17, 18 for the second pusher 12, which are antagonists in the direction D to opposed bolts, respectively 17, 18 and 15, 16 controlled by the other pushers 12, 11. This direction D is shown in the figures in a preferred embodiment where it is, typically, perpendicular to the elongation direction of the bracelet 100.

In a particular version illustrated in the figures, the first pusher 11 and the second pusher 12 are substantially coplanar, and preferably coplanar.

Each of these bolts 15, 16, 17, 18 is arranged to immobilize, in this closed position, at the level of the eye 8, 9, respectively, complementary locking pin, the clearance 6A, 7A, of the pin 6, 7 respectively eye, lock, concerned.

The individual stroke of each of the push-buttons 11, 12 is less than a release stroke during which at least two antagonistic bolts release, in an open position, the clearance 6A, 7A of at least one of the pins 6, 7 respectively, respectively. , lock.

The cumulative stroke of the pushers 11, 12 is greater than or equal to this release stroke.

According to the invention, and as visible in particular on the figure 2 , the first pusher 11 directly, jointly and simultaneously drives a first primary bolt 15 facing a first pin 6, eye respectively locking, and a second primary bolt 16 facing a second pin 7, eye respectively, locking. Preferably, the first pusher, the first primary bolt 15 and the second primary bolt 16 form a one-piece assembly.

While the second pusher 12 independently drives from one another a first secondary bolt 17 facing this first pin 6, eye respectively, locking, and a second secondary bolt 18 facing the second pin 7, respectively eye , locking, so that only the cumulative actuation of these two pushers 11, 12 causes the movement of all bolts 15, 16, 17, 18, in their entire race release means for releasing both the first pin 6 and the second pin 7, respectively eyelids, locking, and so that one of the two secondary bolts 17, 18 remains in the locking return position at the time of the insertion of one of these pins 6, 7, respectively oeils, locking to the eye 8, 9, respectively pawn, complementary locking corresponding thereto, to take a locking position.

Preferably, as visible on the figure 3 , the second pusher 12 is arranged for, during a pressure exerted by the user, to push in the direction D, by a bearing surface 12A that includes this second pusher 12, a first bearing surface 31 B of the first secondary bolt 17 or a first female slide 31 carrying this first secondary bolt 17, and a second bearing face 32B of the second secondary bolt 18 or a second female slide 32 carrying this second secondary bolt 18, so as to move the first secondary bolt 17 and the second secondary bolt 18 parallel to each other.

Preferably, according to the invention, in the absence of action of the user on one of the pushers 11, 12, the first secondary bolt 17 and the second secondary bolt 18 are independently movable one of the other against elastic return means. This arrangement is particularly advantageous because it allows the locking position of one of these two secondary bolts to be maintained in the locking position, for example by maintaining the locking of a pin 6 or 7 already engaged, when the operator manipulates the carrier strand. the other piece which is not yet engaged in the clasp, inserts this piece into the corresponding eye, and, as a result, tends to remove the bolts of this eye to allow the passage of this other piece, without however that the pin already engaged and locked is not released, It also means that when, during the insertion of this other pawn, the first pusher deviates from the locking position, the secondary bolt that held the pawn already engaged n ' is not affected by this maneuver, and remains in lock position hold.

Advantageously, as visible on the Figures 6 to 10 , in the absence of action of the user on one of the pushers 11, 12, the first secondary bolt 17 and the second secondary bolt 18 are movable independently of each other against means of resilient return which are confused with the elastic return means 13, 14 against which are movable the first pusher 11 and the second pusher 12.

It is understood that the eyes 8, 9, or respectively pions, complementary locking are variable geometry chambers, each delimited by a primary bolt actuated by the first pusher 11 and by a secondary bolt actuated by the second pusher, these bolts primary and secondary 12 being arranged to behave as immobilizing jaws pions 6, 7, respectively oeils, locking, corresponding. Thus a first eye 8, respectively pin, of complementary locking, is delimited by the cooperation of the first primary bolt 15 and the first secondary bolt 17 and a second eye 8, respectively pion, complementary locking, is delimited by the cooperation of the second bolt primary 16 and the second secondary bolt 18. And each eye 8, 9, respectively pion, complementary locking, constitutes a variable volume chamber, between an open position in which it is likely to allow passage to a head 6B, 7B that includes the pin 6, 7, eye respectively, lock, which corresponds to it, and a closed position in which it is likely to grip the clearance 6A, 7A of the pin 6, 7, respectively eye, locking, corresponding to it, between jaws constituted by bearing faces that comprise said bolts concerned, while immobilizing the head 6B, 7B, on the opposite side to the strand 2, 3 suppor both the pin 6, 7, eye respectively, locking, concerned, with respect to these jaws.

The first pusher 11, like the second pusher 12, is movable in the direction D between a first stable rest position PSR where its extension relative to the loop 10 is maximum, and in which it does not cooperate with any of the pins 6, 7 , respectively oeils, of locking, another second intermediate stable position PSI locking where it immobilizes at least one of the pins 6, 7, respectively oeils, locking, and a third transient release position PTL under sustained support of the user and in which it tends to release the pins 6, 7, respectively oeils, locking.

In a particular embodiment, the first stable rest position PSR and said second stable intermediate position PSI locking the first pusher 11 are combined. Similarly, the first stable rest position PSR and said second stable intermediate PSI locking position of the second pusher 12 are combined.

The first pusher 11 is movable from its first stable rest position to its third transient release position in a first operating direction D1, and the second pusher 12 is movable from its first stable rest position to its third transient release position. in a second operating direction D2 opposed to the first direction D1.

For the first pusher 11 alone, this third transient PTL release position can also be reached, not by action of the user on the pushbutton (s), but by action of the user on one of the strands 2 or 3.

While the particular kinematics specific to the second pusher 12 which pushes independently of each other the secondary bolts 17 and 18 is not reversible. The complete return of one of the two secondary bolts 17 and 18 in the direction D1 opposite to the direction D2 has the effect of bringing back the second pusher 12 in its first stable rest position PSR if, at the level of the secondary bolt concerned the pin n ' is not engaged with the corresponding eye, and the other secondary bolt then has complete freedom to move without influence on the one who has thus pushed the second push 12 to its stable rest position PSR.

The second intermediate stable rest position PSI is occupied by the second pusher 12 when at the same time each peg 6 and 7, respectively eye, is engaged in the eye, respectively pawn, corresponding.

Preferably, each bolt tends to immobilize the peg, respectively eye, corresponding, in traction. For this purpose, each pusher causes hook-shaped bolts.

As visible on the figure 6 , the first primary bolt 15 and the second primary bolt 16 each comprise a bearing face 15A, 16A which faces the direction opposite to the direction D1 of passage from the first stable rest position PSR to the third transitory position of release PIL , ie turned towards the first stable rest position PSR of the first pusher 11. And, similarly, the first secondary bolt 17 and the second secondary bolt 18 each comprise a bearing face 17A, 18A which is turned towards the direction opposite to the direction D2 of passage from the first stable rest position PSR to the third PIL release transient position, that is to say towards the first stable rest position PSR of the second pusher 12. This arrangement is established so that, in the absence of support by the user on at least the first pusher 11 respectively on the second pusher 12, the first primary bolt 15 and the second primary bolt 16, respectively the first secondary bolt 17 and said second secondary bolt 18, tend to approach the first secondary bolt 17 and the second secondary bolt 18, respectively of the first primary bolt 15 and the second primary bolt 16, in a translation movement in the opposite direction to the first operating direction D, respectively to the second operating direction D2, under the action of resilient return means which are preferably merged with the elastic return means 13, 14 against which are movable the first pusher 11 and the second pusher 12.

The bearing faces 15A, 16A, 17A, 18A may, as visible on the Figures 6, 7 , 9 and 10 , being sloped or / and radiated, advantageously they are constituted in the form of nozzles connected to the corresponding bolts by evolving surfaces arranged to tend to push the heads 6B, 7B, pins 6 and 7.

This hook configuration ensuring a locking tension ensures good retention of the locking pins, and also ensures the maintenance of the components of the clasp 1 inside thereof.

The figure 9 shows a guard, in the form of a functional game J, at the opening of the clasp 1.

The Figures 7 and 8 illustrate a particular embodiment of the invention, in which the first pusher 11 adopts the configuration of a male pusher, comprising, in its median part, an arm 41 connecting with a bearing end portion of the first primary bolt 15 and the second bolt primary 16. The second pusher 12 is designed to maneuver, by pushing, a first female slide 31 carrying the first secondary bolt 17, and a second female slide 32 bearing the second secondary bolt 18.

To ensure both the safety of maintaining the components and the limitation of strokes, the invention comprises a number of stops: thus the first pusher 11 has a mobility relative to the loop 10, which is limited in abutment by the race of a stop 24 in a chamber 23. Similarly, the first secondary bolt 17 and the second secondary bolt 18, or more exactly the drawers 31 and 32 which carry them if it is the case, each have a mobility per compared to the loop 10, which is limited in abutment by the stroke of a stop 27, 28 in a chamber 25, 26, as visible on the figures 2 , 7 and 8 .

Similarly, the second pusher 12 itself has a mobility relative to the loop 10, which is limited in abutment by the stroke of at least one stop 27, 28 in a chamber 38, 39.

In a particular embodiment, as visible on the figure 6 the second pusher 12 has a sliding bearing surface 29 arranged to cooperate with a sliding surface complementary 33, 34 that includes, or each of the secondary bolts 17, 18, or each of the female drawers 31, 32 which carry them.

In the version illustrated by the figures, these drawers 31, 32 are said to be female because they are arranged to constitute guide means for the male pusher 11. Thus, the loop 10 comprises translational guide bearing surfaces 51, 52 in the direction D, which are arranged to cooperate with complementary first guide surfaces 31A; 32A that comprise the secondary bolts 17, 18 or drawers 31, 32 bearing these secondary bolts 17, 18: These secondary bolts 17, 18 or these drawers 31, 32 further comprise second guide surfaces 36B, 37B arranged to cooperate one with the other, or with a guide element in the direction D that includes the loop 10, and / or the second pusher 12, and / or the first pusher 11.

The figure 8 illustrates a version where these second guide surfaces 36B, 37B belong to pins 36, 37, which comprise the secondary bolts 17, 18 or drawers 31, 32 bearing these secondary bolts 17, 18. These tenons comprise other guiding surfaces 36C, 37C, arranged to cooperate with the flanks 35A, 35B of a groove that includes the second pusher 12.

In a particular embodiment illustrated on the figure 8 the first secondary bolt 17 and the second secondary bolt 18, or the female drawers 31, 32 which carry them, have guide surfaces 45, 46 extending in the direction D and arranged to cooperate with complementary guide surfaces. 43, 44 that includes the first pusher 11 in the vicinity of the first primary bolt 15 and the second primary bolt 16.

In a particular embodiment illustrated on the figure 8 , the first secondary bolt 17 and the second secondary bolt 18, or the female drawers 31, 32 which carry them, comprise guide surfaces 47, 48 extending in the direction D and arranged to cooperate with an arm 41 which has in its middle part the first pusher 11.

The particular design of the guide surfaces of the pushers and bolts of the clasp according to the invention ensures a flexible and precise operation, without any bracing.

The clasp according to the invention is, again, particularly robust, and is well suited for securing the wristband of a watch or a jewel of high price.

The invention also relates to a bracelet 100 comprising such a clasp 1.

Claims (14)

1. Triple security unfolding clasp (1) for holding two ends (200; 300) of a bracelet (100) or strap, said clasp (1) comprising a buckle (10) around both sides of which are hinged a first strand (2) and a second strand (3), each carrying a shouldered locking pin (6; 7) or eye respectively, and said pin (6; 7) or eye arranged to cooperate in a closing position of said clasp (1) with a complementary locking eye (8; 9) or pin respectively comprised in said buckle (10), and wherein said buckle (10) includes a first pusher (11) and a second pusher (12) which can move in the same direction (D), each against resilient return means (13; 14) returning said pushers towards a locking position and each arranged to control, directly or indirectly, the forward or backward movement of two bolts (15, 16; 17, 18), which are antagonistic in said direction (D) to opposite bolts (17, 18; 15, 16) controlled by the other of said pushers (12; 11), each said bolt being arranged to immobilise, in said closing position, at said complementary locking eye (8, 9) or pin respectively, a constricted portion (6A, 7A) comprised in said locking pin (6; 7) or eye respectively, and the individual travel of each of said pushers (11; 12) is smaller than a release travel during which at least two antagonistic bolts release, in an opening position, said constricted portion of at least one of said locking pins (6; 7) or eyes respectively, and the cumulated travel of said pushers (11; 12) is greater than or equal to said release travel, characterized in that said first pusher (11) simultaneously, directly and integrally drives a first primary bolt (15) opposite a first locking pin (6) or eye respectively, and a second primary bolt (16) opposite a second locking pin (7) or eye respectively, whereas said second pusher (12) independently drives a first secondary bolt (17) opposite said first locking pin (6) or eye respectively, and a second secondary bolt (18) opposite said second locking pin (7) or eye respectively, so that only the combined actuation of said two pushers (11, 12) causes the movement of all of the bolts through their entire release travel to release both said first locking pin (6) and said second locking pin (7) or eyes respectively, and so that one of said two secondary bolts (17, 18) remains in the locking return position during the insertion of one of said locking pins (6, 7) or eyes respectively towards said complementary locking eye (8, 9) or pin respectively corresponding thereto, to take a locking position.
2. Triple security unfolding clasp (1) according to claim 1, characterized in that, when the user exerts pressure, said second pusher (12) is arranged to push, in said direction (D) and via a bearing surface (12A) comprised in said second pusher (12), a first bearing surface (31 B) of said first secondary bolt (17), or of a first female slide (31) carrying said first secondary bolt (17), and to push a second bearing surface (32B) of said second secondary bolt (18),or a second female slide (32) carrying said second secondary bolt (18), so as to move said first secondary bolt (17) and said second secondary bolt (18) parallel to each other.
3. Triple security unfolding clasp (1) according to claim 1, characterized in that, in the absence of any action by the user on one of the pushers (11, 12), said first secondary bolt (17) and said second secondary bolt (18), or a first female slide (31) carrying said first secondary bolt (17) and a second female slide (32) carrying said second secondary bolt (18), can move independently of each other against resilient return means.
4. Triple security unfolding clasp (1) according to claim 1, characterized in that, in the absence of any action by the user on one of the pushers (11, 12), said first secondary bolt (17) and said second secondary bolt (18) can move independently of each other against resilient return means which are the same as said resilient return means (13, 14) against which said first pusher (11) and said second pusher (12) can move.
5. Triple security unfolding clasp (1) according to any of preceding claims, characterized in that a said first complementary locking eye (8) or pin respectively, is delimited by the cooperation of said first primary bolt (15) and said first secondary bolt (17), and in that a said second complementary locking eye (8) or pin respectively is delimited by the cooperation of said second primary bolt (16) and said second secondary bolt (18), and each said complementary locking eye (8; 9) or pin respectively constitutes a chamber of variable volume, between an opening position in which it is able to let pass a head (6B, 7B) comprised in said locking pin (6; 7) or eye respectively corresponding thereto, and a closing position in which it is able to grip said constricted portion (6A, 7A) of one said locking pin (6; 7) or eye respectively corresponding thereto, between jaws formed by bearing surfaces comprised in said bolts concerned, and immobilising said head (6B; 7B) on the opposite side to said strand (2; 3) carrying said locking pin (6; 7) or eye respectively concerned, relative to said jaws.
6. Triple security unfolding clasp (1) according to any of preceding claims, characterized in that said first pusher (11), like said second pusher (12), is moveable in said direction (D) between a first stable rest position of maximum extension relative to said buckle (10) and in which said pusher does not cooperate with any of said locking pins (6; 7) or eyes respectively, another second stable intermediate locking position in which said pusher immobilises at least one of said locking pins (6; 7) or eyes respectively, and a third transitory release position under maintained pressure by the user and in which said pusher tends to release said locking pins (6, 7) or eyes respectively, said first pusher (11) being moveable from its said first stable rest position to its said third transitory release position in a first actuating direction (D1), and said second pusher (12) being moveable from its said first stable rest position to its said third transitory release position in a second actuating direction (D2) opposite to said first direction (D1), and in that said first primary bolt (15) and said second primary bolt (16) each include a bearing surface (15A; 16A) which is turned towards said first stable rest position of said first pusher (11), and in that said first secondary bolt (17) and said second secondary bolt (18) each include a bearing surface (17A; 18A) which is turned towards said first stable rest position of said second pusher (12), so that, in the absence of any pressure by the user on at least said first pusher (11) or respectively on said second pusher (12), said first primary bolt (15) and said second primary bolt (16), or said first secondary bolt (17) and said second secondary bolt (18) respectively, tend to move closer to said first secondary bolt (17) and said second secondary bolt (18), or to said first primary bolt (15) and said second primary bolt (16) respectively, in a movement of translation in the opposite direction to said first actuating direction (D1) or to said second actuating direction (D2) respectively, under the action of resilient return means.
7. Triple security unfolding clasp (1) according to claim 6, characterized in that said first stable rest position and said second stable intermediate locking position of said first pusher (11) are the same, and in that said first stable rest position and said second stable intermediate locking position of said second pusher (12) are the same.
8. Triple security unfolding clasp (1) according to any of preceding claims, characterized in that the mobility of said first pusher (11) relative to said buckle (10) is limited in abutment by the travel of a stop (24) in a chamber (23), and in that the mobility of said first secondary bolt (17) and said second secondary bolt (18) relative to said buckle (10) is limited in abutment by the travel of a stop (27; 28) in a chamber (25; 26).
9. Triple security unfolding clasp (1) according to any of preceding claims, characterized in that the mobility of said second pusher (12) relative to said buckle (10) is limited in abutment by the travel of at least one stop (27; 28) in a chamber (38, 39).
10. Triple security unfolding clasp (1) according to any of preceding claims, characterized in that said second pusher (12) includes a sliding bearing surface (29) arranged to cooperate with a complementary sliding surface (33; 34) comprised in each of said secondary bolts (17; 18).
11. Triple security unfolding clasp (1) according to any of preceding claims, characterized in that said buckle (10) includes bearing surfaces (51, 52) for guiding in translation in said direction (D), arranged to cooperate with first complementary guide surfaces (31A; 32A) comprised in said secondary bolts (17; 18) or slides (31; 32) carrying said secondary bolts (17; 18), which also include second guide surfaces (36B, 37B) arranged to cooperate with each other or with a guide element in said direction (D) comprised in said buckle (10) or said second pusher (12) or said first pusher (11).
12. Triple security unfolding clasp (1) according to any of preceding claims, characterized in that said first secondary bolt (17) and said second secondary bolt (18) include guide surfaces (45; 46) extending in said direction (D) and arranged to cooperate with complementary guide surfaces (43; 44) comprised in said first pusher (11) in proximity to said first primary bolt (15) and second primary bolt (16).
13. Triple security unfolding clasp (1) according to any of preceding claims, characterized in that said first secondary bolt (17) and said second secondary bolt (18) include guide surfaces (47; 48) extending in said direction (D) and arranged to cooperate with an arm (41) comprised in the median part of said first pusher (11).
14. Bracelet (100) including a clasp (1) according to any of preceding claims.

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