Clasp for a bracelet or belt

1. A bracelet clasp, comprising:

at least first and second strips, the first strip being hinged to the second strip by a first end, between a closed position, in which the first strip is folded onto the second strip, and an open position, in which a second end of the first strip is distant from the second strip, the first strip carrying, at the second end, a securing member to secure a first bracelet strand of a bracelet, a second bracelet strand of the bracelet being at least indirectly connected to the second strip, and the second strip comprising a first locking mechanism to hold the first strip in the closed position,

the securing member comprising an adjustment mechanism to adjust a useful length of the bracelet,

said adjustment mechanism comprising:

a base plate secured to the second end of the first strip,

a cap pivotally hinged to the base plate, the first bracelet strand passing between the base plate and the cap and being held by a holding mechanism, and

a second locking mechanism to lock the cap in a closed position on the base plate, and

wherein the second locking mechanism comprises a push-piece arranged to be moved in a longitudinal direction of the bracelet along which the length of the bracelet is adjustable with the adjustment mechanism, in response to an action of a user, between a first rest position in which the cap is locked in the closed position on the base plate, and a second pushed-in position in which the cap is unlocked from the base plate.

2. The clasp according to claim 1 , wherein the cap has an L-shaped groove on an inner face of at least one lateral wall thereof, in proximity to one end thereof.

3. The clasp according to claim 1 , wherein the push-piece includes a slug on at least one edge thereof, the slug being configured to cooperate with a corresponding L-shaped groove.

4. The clasp according to claim 1 , wherein the second locking mechanism includes a return mechanism configured to cooperate with the push-piece so as to hold the push-piece in the closed position.

5. The clasp according to claim 4 , wherein said return mechanism includes at least one spring.

6. The clasp according to claim 4 , wherein the base plate comprises a guide to guide the push-piece, and the return mechanism rests in the guide.

7. The clasp according to claim 1 , wherein the base plate comprises a guide to guide the push-piece.

8. The clasp according to claim 1 , wherein the holding mechanism includes a stud, the base plate has the stud on an upper face thereof, and the stud is insertable in a suitable hole of the first bracelet strand to define an anchoring point.

9. The clasp according to claim 1 , wherein the first bracelet strand is inserted through the adjustment mechanism from a side of the adjustment mechanism where the cap is hinged on the base plate.

10. A wristwatch comprising the bracelet provided with the clasp according to claim 1 .

11. A module for securing a strand of a bracelet to a fastener, comprising:

an adjustment mechanism to adjust a length of the strand, the adjustment mechanism comprising:

a base plate,

a cap pivotally hinged to the base plate, the strand passing between the base plate and the cap and being held by a holding mechanism, and

a locking mechanism to lock the cap on the base plate in a closed position is provided in the base plate, and

wherein the locking mechanism includes a push-piece arranged to be moved in a longitudinal direction of the bracelet along which the length of the strand is adjustable with the adjustment mechanism, in response to an action of a user, between a first rest position in which the cap is locked in the closed position on the base plate, and a second pushed-in position in which the cap is unlocked from the base plate.

12. A bracelet clasp, comprising:

at least first and second strips, the first strip being hinged to the second strip by a first end, between a closed position, in which the first strip is folded onto the second strip, and an open position, in which a second end of the first strip is distant from the second strip, the first strip carrying, at the second end, a securing member to secure a first bracelet strand of a bracelet, a second bracelet strand of the bracelet being at least indirectly connected to the second strip, and the second strip comprising a first locking mechanism to hold the first strip in the closed position,

the securing member comprising an adjustment mechanism to adjust a useful length of the bracelet,

said adjustment mechanism comprising:

a base plate secured to the second end of the first strip,

a cap pivotally hinged to the base plate, the first bracelet strand passing between the base plate and the cap and being held by a holding mechanism, and

a second locking mechanism to lock the cap in a closed position on the base plate,

wherein the second locking mechanism comprises a push-piece arranged to be moved in a longitudinal direction of the bracelet, in response to an action of a user, between a first rest position in which the cap is locked in the closed position on the base plate, and a second pushed-in position in which the cap is unlocked from the base plate, and

wherein the base plate comprises a guide to guide the push-piece.

13. The clasp according to claim 12 , wherein the cap has an L-shaped groove on an inner face of at least one lateral wall thereof, in proximity to one end thereof.

14. The clasp according to claim 12 , wherein the push-piece includes a slug on at least one edge thereof, the slug being configured to cooperate with a corresponding L-shaped groove.

15. The clasp according to claim 12 , wherein the second locking mechanism includes a return mechanism configured to cooperate with the push-piece so as to hold the push-piece in the closed position.

16. The clasp according to claim 15 , wherein said return mechanism includes at least one spring.

17. The clasp according to claim 15 , wherein he return mechanism rests in the guide.

18. The clasp according to claim 12 , wherein the holding mechanism includes a stud, the base plate has the stud on an upper face thereof, and the stud is insertable in a suitable hole of the first bracelet strand to define an anchoring point.

19. The clasp according to claim 12 , wherein the first bracelet strand is inserted through the adjustment mechanism from a side of the adjustment mechanism where the cap is hinged on the base plate.

20. A wristwatch comprising the bracelet provided with the clasp according to claim 12 .