Deployant bracelet clasp

Abstract

Deployant or folding clasp including, hinged around a support, a first arm being hinged to a first stirrup member, and a second arm to a second stirrup member. This first stirrup member forms part of a first single-piece cap whose bottom surface defines, with one end of this first arm, in any angular position thereof, a space for the passage of a wristband strand having a thickness smaller than or equal to a given thickness, and this second stirrup member forms the bottom part of a second removable cap and includes at least one securing means arranged to cooperate, by clamping around an orifice of a wristband strand, with a complementary securing means of a removable top part of this second cap, to adjust the useful length of this wristband strand.

What is claimed is: 
     
         1 . A deployant or folding clasp including a first and a second arm hinged around a support, said first arm being hinged to a first stirrup member and said second arm to a second stirrup member, wherein said first stirrup member forms part of a first single-piece cap whose bottom surface defines, with one end of said first arm, in any angular position thereof, a space for the passage of a wristband strand having a thickness smaller than or equal to a given thickness, and said second stirrup member forms the bottom part of a second removable cap and includes at least one securing means arranged to cooperate, by clamping around an orifice of a wristband strand, with a complementary securing means of a removable top part of said second cap, to adjust the useful length of said wristband strand. 
     
     
         2 . The deployant or folding clasp according to claim, wherein the clasp is provided for a flexible wristband or bracelet of given thickness, said first arm extending between a first end and a second end, said second arm extending between a first end and a second end, said support extending between a first hinge and a second hinge, said first arm being hinged at said first end to said first hinge and at said second end to said first stirrup member, and said second elastic arm being hinged at said first end to said second hinge and at said second end to said second stirrup member, said first stirrup member including a first hinge pin for said first arm, and a second pin for securing to a fixed wristband strand having a thickness smaller than or equal to said given thickness, said concealed bottom surface of said first cap defining with said second end of said first arm, in any angular position of said second end, said passing space for the passage of a wristband strand having a thickness smaller than or equal to said given thickness, so as to form a guide loop for a said wristband strand. 
     
     
         3 . The clasp according to  claim 1 , wherein said first arm includes a first elastically withdrawable locking means, in that said second arm includes a second elastically withdrawable locking means, and in that said support includes a first complementary locking means and a second complementary locking means arranged to cooperate respectively with said first locking means and with said second locking means in a locking position. 
     
     
         4 . The clasp according to the preceding claim, wherein said first single-piece cap includes, on the opposite side to said bottom surface and to said first stirrup member, a first cabochon whose first edge surface is in abutment on a second opposing edge surface of a second cabochon comprised in said second cap, when said clasp is in a closed and locked position in which said first and said second arms are pressed onto said support in said locking position. 
     
     
         5 . The clasp according to the preceding claim, wherein said first cabochon includes a safety locking means arranged to cooperate, in said closed and locked position, with a complementary safety locking means comprised in said second cabochon 
     
     
         6 . The clasp according to  claim 1 , wherein said second stirrup member includes, in addition to said at least one securing means, either at least one pin cooperating with a bore of said removable top part of said second cap, or a bore cooperating with a pin of said removable top part. 
     
     
         7 . The wristband or bracelet including at least one deployant or folding clasp according to  claim 1  and, around said at least one clasp, a first fixed strand and a second adjustable strand having a thickness smaller than or equal to said given thickness, wherein said first strand is fixed to said first stirrup member by a first hinge pin of said first arm in the prolongation of said first strand and by a second pin traversing said first strand, said first strand defining with said bottom surface said space arranged for the passage of said second strand which is secured to said second cap via the cooperation of said at least one securing means, clamped around an orifice of said second strand, with said complementary securing means of said removable top part of said second cap. 
     
     
         8 . The wristband or bracelet according to the preceding claim, wherein said first fixed strand and/or said second adjustable strand is a flexible strand. 
     
     
         9 . The timepiece or piece of jewellery including at least one wristband or bracelet according to  claim 7 . 
     
     
         10 . The timepiece or piece of jewellery including at least one wristband or bracelet according to  claim 8 .