Clasp for piece of jewellery or wristwatch

Abstract

Clasp for a piece of jewellery or wristwatch, including a stretcher like structure with a first housing in which a first push-piece and a second push-piece are moveable on a first bearing surface against an elastic return means, and held by at least one closure plate able to occupy a closure position in a second housing. The clasp includes at least one resilient locking element for this closure plate, including a push-button, held in this stretcher like structure and arranged, in a compressed position, to permit the motion of the closure plate and, in a relaxed position, to immobilise this closure plate in the closure position via the cooperation of this push-button with a fourth housing comprised in the closure plate.

What is claimed is: 
     
         1 . A Clasp for a piece of jewellery or wristwatch, including a stretcher like structure with a first housing in which a first push-piece and a second push-piece are moveable against each other on a first bearing surface against an elastic return means, said first push-piece and said second push-piece being held in said first housing by at least one closure plate able to occupy a closure position in a second housing, wherein said clasp includes at least one resilient locking element for said closure plate, said resilient locking element including a push-button and being held in said stretcher like structure and arranged, on one hand, in a compressed position to permit the motion of said at least one closure plate and, on the other hand, in a relaxed position, to immobilise said at least one closure plate in said closure position via the cooperation of said push-button with a fourth housing comprised in said at least one closure plate. 
     
     
         2 . The clasp according to  claim 1 , wherein said resilient locking element is housed in a closed hole comprised in said first push-piece or said second push-piece to prevent the removal thereof, and to limit the travel of said pusher. 
     
     
         3 . The clasp according to  claim 1 , wherein the clasp includes, cooperating with at least one said resilient locking element, a first closure plate for holding said first push-piece and, cooperating with at least one said resilient locking element, a second closure plate for holding said second push-piece. 
     
     
         4 . The clasp according to  claim 3 , wherein said first closure plate includes a single said fourth housing cooperating with a single said resilient locking element, and in that said second closure plate includes two fourth housings each cooperating with one said resilient locking element. 
     
     
         5 . The clasp according to  claim 1 , wherein said first closure plate limits the travel of said first push-piece towards the centre of said stretcher like structure and in that said second closure plate limits the travel of said second push-piece towards the centre of said stretcher like structure. 
     
     
         6 . The clasp according to  claim 1 , wherein said second housing comprised in said stretcher like structure for receiving each closure plate in a closure position, is formed by a bevel housing arranged to cooperate in a complementary manner with an oblique beak comprised in said closure plate in the closure position thereof. 
     
     
         7 . The clasp according to  claim 1 , wherein said resilient locking element is held in a third housing comprised in said stretcher like structure. 
     
     
         8 . The clasp according to  claim 1 , wherein said first push-piece and said second push-piece are joined to each other by a spring exerting a stress on said push-pieces in the direction of mobility thereof. 
     
     
         9 . The clasp according to  claim 1 , wherein the clasp includes at least one folding arm hinged to said stretcher like structure, said at least one folding arm including a complementary locking means arranged to cooperate, in a closed position of said at least one folding arm in superposition on said stretcher like structure, with a locking means comprised in each of said first push-piece and said second push-piece, in a locking position under the effect of an elastic return force exerted by said elastic return means. 
     
     
         10 . The clasp according to  claim 9 , wherein, in the closed position in superposition on said stretcher like structure, said at least one folding arm is on the same side as said at least one closure plate relative to said stretcher like structure. 
     
     
         11 . The clasp according to  claim 9 , wherein, in the closed position in superposition on said stretcher like structure, said at least one folding arm is on the opposite side as said at least one closure plate relative to said stretcher like structure. 
     
     
         12 . The clasp according to  claim 9 , wherein said stretcher like structure includes two said opposing folding arms hinged to said stretcher like structure by a hinge and each including a fork fitting opposite said hinge, said fork fittings of said two folding arms being positioned in immediate proximity to each other in the locking position of each of said folding arms in superposition on said stretcher like structure. 
     
     
         13 . A bracelet including at least one clasp according to  claim 1 . 
     
     
         14 . A wristwatch including a bracelet according to the preceding claim.