Unfolding bracelet clasp

Abstract

The invention relates to an unfolding bracelet clasp, in particular a watch bracelet, formed of two strands (A) and (B), comprising a metal plate ( 10 ) whereof one end is coupled with an articulation ( 11 ) at the bracelet strand (A) free end and a lever ( 12 ) whereof the pin ( 13 ) is mounted at the plate ( 10 ) other end. Said lever ( 12 ) comprises a U-shaped part whereof the legs extend on each side of the bracelet forming at their ends hooks ( 18 ) designed to be urged in engagement, when the bracelet is closed, with the ends of a spring box axle ( 20 ) transversely housed in the bracelet strand (A) at some distance from the articulation ( 11 ) substantially equal to the plate ( 10 ) length. The length of the bracelet is adjusted by a dog point ( 19 ) engaged in a suitable hole of the bracelet strand (B).

What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims:  
     
         1 . An unfolding bracelet clasp, in particular for a watch bracelet, comprising 
 a set plate ( 10 ),    wherein the ends of the plate are connected by hinges to the ends of a lower strand (A) and of an upper strand (B); and    a lever  12 , wherein an axle ( 13 ) of the lever ( 12 ) forms one of said hinges, wherein one arm ( 14 ) offers means ( 19 ) allowing to hold the set plate ( 10 ) in a folded up position on the upper strand (B), and    wherein another arm ( 17 ) offers means ( 18 ) allowing to fasten said plate ( 10 ), thus folded up, to the lower strand (A).    
     
     
         2 . The unfolding bracelet clasp according to  claim 1 , wherein the said means allowing to fasten said set plate ( 10 ) include at least one hook cooperating with an element ( 20 ) of the lower strand (A).  
     
     
         3 . The unfolding bracelet clasp according to  claim 2 , wherein the said element ( 20 ) is a spring box axle.  
     
     
         4 . The unfolding bracelet clasp according to  claim 2 , wherein the said lever ( 12 ) is formed by a bent piece of U shape, wherein a base ( 15 ) and a part of legs ( 16 ) form the said one arm ( 14 ), wherein this piece forms a buckle with said axle ( 13 ).  
     
     
         5 . The unfolding bracelet clasp according to  claim 1 , wherein said another arm ( 17 ) is formed at its ends in the shape of hooks ( 18 ) of legs of the piece of U shape.  
     
     
         6 . The unfolding bracelet clasp according to  claim 1 , wherein said means ( 18 ) allowing to fasten said set plate ( 10 ) are arranged in a way to cooperate with a strap of the bracelet.  
     
     
         7 . The unfolding bracelet clasp according to  claim 1 , wherein said means ( 18 ) allowing to fasten said set plate ( 10 ) include at tongue.  
     
     
         8 . The unfolding bracelet clasp according to  claim 1 , wherein the said means ( 19 ) allowing to hold the set plate ( 10 ) are formed by a locking stud which extends from the base ( 15 ) and which is susceptible to engage under pressure in one of several of holes of the bracelet.  
     
     
         9 . The unfolding bracelet clasp according to  claim 1 , wherein the said means ( 30 ) are formed by a locking tongue which can freely rotate around the axle ( 13 ) thus engaging in one of several of the holes of the bracelet.  
     
     
         10 . An unfolding bracelet clasp comprising 
 a rigid or elastic set plate ( 10 ),    wherein the ends of this set plate ( 10 ) are connected by hinges ( 11 ,  13 ) to the ends of a lower strand (A) and of an upper strand (B); and    a lever  12 , wherein an axle ( 13 ) of the lever ( 12 ) forms a hinge ( 13 ),    wherein a first arm ( 14 ) offers first means ( 19 ) allowing to hold the set plate ( 10 ) in a folded up position on the upper strand (B), and    wherein a second arm ( 17 ) offers second means ( 18 ) allowing to fasten said plate ( 10 ), thus folded up, to the lower strand (A).    
     
     
         11 . The unfolding bracelet clasp according to  claim 10 , wherein the said means allowing to fasten said set plate ( 10 ) include at least one hook cooperating with an element ( 20 ) of the lower strand (A).  
     
     
         12 . The unfolding bracelet clasp according to  claim 11 , wherein the said element ( 20 ) is a small bar ( 20 ) mounted transversely in the lower strand (A).  
     
     
         13 . The unfolding bracelet clasp according to  claim 11 , wherein the said lever ( 12 ) is formed by a bent piece of U shape, wherein a base ( 15 ) and a part of legs ( 16 ) form the said first arm ( 14 ), wherein this piece forms a buckle with said axle ( 13 ).  
     
     
         14 . The unfolding bracelet clasp according to  claim 10 , wherein said second arm ( 17 ) is formed at its ends in the shape of hooks ( 18 ) of legs of the piece of U shape.  
     
     
         15 . The unfolding bracelet clasp according to  claim 10 , wherein said second means ( 18 ) allowing to fasten said set plate ( 10 ) are formed by a locking stud ( 19 ), which extends from the base ( 15 ) and which is susceptible to engage under pressure in one of several of holes of the strand (B). arranged in a way to cooperate with a strap of the bracelet.  
     
     
         16 . The unfolding bracelet clasp according to  claim 10 , wherein the said means ( 19 ) allowing to hold the set plate ( 10 ) are formed by a locking stud ( 19 ) which extends from the base ( 15 ) and which is susceptible to engage under pressure in one of several of holes of the upper strand (B) of the bracelet.