This clasp comprises at least two branches (1, 2) articulated on one another via one of their respective ends. One of the free ends of these branches (1, 2) comprises a lever (12, 22, 33) articulated about a shaft (10, 20, 32) parallel to the articulation shaft (3) of said branches (1, 2) and fixedl
This clasp comprises at least two branches (1, 2) articulated on one another via one of their respective ends. One of the free ends of these branches (1, 2) comprises a lever (12, 22, 33) articulated about a shaft (10, 20, 32) parallel to the articulation shaft (3) of said branches (1, 2) and fixedly attached to a hook (17, 27, 33c), the other of the free ends of these branches comprising a coupling element (4, 34) shaped to allow the hook (17, 27, 33c) to engage therewith, to keep the branches (1, 2) in the folded position. The lever ( 12, 22, 33) comprises elastic means (15, 25, 37) to exert a torque thereon and abutment means (13, 23) to limit its pivoting, under the effect of the torque, about said shaft (10, 20, 32) in a position corresponding at least to the engagement of said latching hook (17, 27, 33c) with the coupling element (4, 34), in which the elastic means (15, 25, 37) are under tension, such that the lever (12, 22, 33) must pivot against the elastic means (15, 25, 37) to engage and to disengage the latching hook (17, 27, 33c) of the coupling element (4, 34).
대표청구항▼
The invention claimed is: 1. A bracelet clasp comprising; first branch having one free end and one articulation end; a second branch having one free end and one articulation end said second branch being articulated with respect to the first branch at the first and second branch articulation ends;
The invention claimed is: 1. A bracelet clasp comprising; first branch having one free end and one articulation end; a second branch having one free end and one articulation end said second branch being articulated with respect to the first branch at the first and second branch articulation ends; a shaft of articulation upon which the first and second branches articulate at the articulation ends of the first and second branches; a latching device for keeping the free ends of the first and second branches in a folded position relative to one another; and a link between the free ends of the first and second branches and respective ends of a bracelet, wherein the free end of the first branch comprises a lever, articulated about a lever shaft parallel to the shaft of articulation of said first and second branches and operatively, rigidly affixed to a latching hook, the free end of the second branch comprising a coupling element formed to engage said latching hook to keep said branches in the folded position, said lever comprising an elastic member to exert a torque thereon and a first stop to limit a range of pivot of the lever under the effect of said torque, to a position corresponding at least to an engagement of said latching hook with said coupling element wherein said elastic member is under tension, such that said lever must pivot against said elastic member during the engagement and a disengagement of said latching hook with said coupling element. 2. The clasp as claimed in claim 1 wherein, in a coupled position, said latching hook extends in a direction of the first branch, over a portion of said lever situated on a side of the lever shaft, opposite the articulation shaft and is curved in the direction of the articulation shaft, while a torque exerted on said lever by said elastic member tends to cause said latching hook to turn in a direction of the articulation shaft between said first and second branches such that the disengagement and engagement of said latching hook of said coupling element results respectively from a movement away from and toward a portion of said lever supporting said latching hook relative to said branch supporting the coupling element. 3. The clasp as claimed in claim 1, wherein said lever is operatively connected to the free end of said first branch by a second link comprising at least two additional articulation shafts parallel to the articulation shaft of said first and second branches, a first additional shaft for articulating the second link to the free end of said first branch, and a second additional shaft for articulating the second link to said lever. 4. The clasp as claimed in claim 3, wherein the second additional articulation shaft of said second link also serves as an articulation shaft of one end of the bracelet. 5. The clasp as claimed in claim 3, wherein said second link comprises a link shaft for a first cover having two parallel side walls internal faces of the side walls comprise opposite pairs of bar positioning elements for connecting one end of the bracelet to one of said pairs of positioning elements. 6. The clasp as claimed in claim 5, wherein second stop serves to limit the amplitude of pivoting of said first cover relative to said second link. 7. The clasp as claimed in claim 6, wherein a portion of said lever situated, in a coupled position, on a side directed toward the articulation shaft of said branches relative to the lever shaft, extends under said first cover, which serves as the first stop to limit the pivoting of said lever about its articulation shaft under the torque, in a position corresponding to the engagement of said latching hook with said coupling element, the torque transmitted by the lever to the first cover via said link tending to press the first cover in a direction of the bracelet. 8. The clasp as claimed in claim 5, wherein a second cover is operatively, pivotally mounted about a cover shaft, the cover shaft being parallel to the articulation shaft, the second cover comprising a coupling element shaped to allow said latching hook to engage therewith, so that in a position pressed down toward the first cover, the second cover covers said lever and tends to oppose an opening of the lever. 9. The clasp as claimed in claim 8, wherein the lever shaft has two elastically retractable ends which protrude laterally and serve to engage, respectively, with two recesses made on two opposite side faces of said second cover to hold the second cover in position pressed down toward the first cover on said lever. 10. The clasp as claimed in claim 1 wherein an angle with which a first trajectory described by a coupling surface of said latching hook about the lever shaft intersects a second trajectory of said first and second branches about the articulation shaft is at least equal to 60째 and the coupling surface of said latching hook is shaped so that, in a coupled position, a reaction to a force tending to separate said articulated first and second branches passes through an articulation shaft of said latching hook. 11. The clasp as claimed in claim 2, wherein said lever is connected at the free end of the first branch by a second link comprising at least two lever articulation shafts parallel to the articulation shaft of said first and second branches, a first lever articulation shaft for articulating the second link with respect to the free end of said first branch and a second lever articulation shaft for articulating the second link with respect to said lever. 12. The clasp as claimed in claim 6, including a second cover, operatively, pivotally mounted about a shaft parallel to the articulation shaft of said first and second branches at the free end of said first branch comprising a coupling element shaped to allow said latching hook to engage therewith, wherein, when the second cover is pressed down toward the first cover, the second cover covers said lever and tends to oppose the opening of the second cover. 13. The clasp as claimed in claim 7 including a second cover, operatively, pivotally mounted about a shaft parallel to the articulation shaft of said first and second branches at the free end of said first branch comprising a coupling element shaped to allow said latching hook to engage therewith, wherein, when the second cover is pressed down toward the first cover, the second cover covers said lever and tends to oppose the opening of the second cover. 14. The clasp as claimed in claim 2, wherein an angle with which a trajectory, described by a coupling surface of said latching hook about the lever articulation shaft, intersects a trajectory of said first and second branches about the articulation shaft of the first and second branches is greater than or equal to 60째 and the coupling surface of said latching hook is shaped so that, in the coupled position, a reaction to a force tending to separate said first and second branches passes through an articulation shaft of said latching hook. 15. The clasp as claimed in claim 3, wherein an angle with which a trajectory described by a coupling surface of said latching hook about the lever articulation shaft intersects a trajectory of said first and second branches about the articulation shaft of the first and second branches is greater than or equal to 60째 and the coupling surface of said latching hook is shaped so that, in a coupled position, a reaction to a force tending to separate said first and second branches passes through an articulation shaft of said latching hook. 16. The clasp as claimed in claim 4, wherein an angle with which a trajectory described by a coupling surface of said latching hook about the lever articulation shaft intersects a trajectory of said first and second branches about their articulation shaft of the first and second branches is greater than or equal to 60째 and the coupling surface of said latching hook is shaped so that, in a coupled position, a reaction to a force tending to separate said first and second branches passes through an articulation shaft of said latching hook. 17. The clasp as claimed in claim 5, wherein an angle with which a trajectory described by a coupling surface of said latching hook about the lever articulation shaft intersects a trajectory of said first and second branches about the articulation shaft of the first and second branches is greater than or equal to 60째 and the coupling surface of said latching hook is shaped so that, in a coupled position, a reaction to a force tending to separate said first and second branches passes through an articulation shaft of said latching hook. 18. The clasp as claimed in claim 6, wherein an angle with which a trajectory described by a coupling surface of said latching hook about the lever articulation shaft intersects a trajectory of said first and second branches about the articulation shaft of the first and second branches is greater than or equal to 60째 and the coupling surface of said latching hook is shaped so that, in a coupled position, a reaction to a force tending to separate said first and second branches passes through an articulation shaft of said latching hook. 19. The clasp as claimed in claim 7, wherein an angle with which a trajectory described by a coupling surface of said latching hook about the lever articulation shaft intersects a trajectory of said first and second branches about the articulation shaft of the first and second branches is greater than or equal to 60째 and the coupling surface of said latching hook is shaped so that, in a coupled position, a reaction to a force tending to separate said first and second branches passes through an articulation shaft of said latching hook. 20. The clasp as claimed in claim 8, wherein an angle with which a trajectory described by a coupling surface of said latching hook about the lever articulation shaft intersects a trajectory of said first and second branches about the articulation shaft of the first and second branches is greater than or equal to 60째 and the coupling surface of said latching hook is shaped so that, in a coupled position, a reaction to a force tending to separate said first and second branches passes through an articulation shaft of said latching hook.
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