Patent ID: 7337541

Claim:
Method for manufacturing a clasp, particularly for wristwatch strap, from a metal strip, of the type comprising a main element and at least one pivoting element, which are connected at one of their respective ends by an articulation, a flexion spring fastened with one of these elements being applied, at least in position of closure, on the other element in order to support it elastically in this position of closure, characterized in that it comprises the steps consisting in: using a strip whose stiffness is the one desired for the spring, making, by cut-out, a blank of each of these elements, so as to form on each of them at least two longitudinal arms, and on the main element two recesses inside the two arms forming therebetween a central flexion spring, subjecting these arms to an annealing exclusively at their ends so as to allow rolling thereof, increasing the stiffness of these arms by making at least one rib along the longitudinal axis thereof.