JEWELLERY LOCK Russian patent published in 2010 - IPC B21F35/00 

FIELD: personal use articles.

SUBSTANCE: invention relates to the field of jewellery production and relates to jewellery lock. Lock comprises spring arranged in the form of twisted element from alloy of precious metal, is made as clasp from alloy of the same standard as the spring. Spring is made of wire with diametre from 0.36 mm to 0.8 mm by drawing in several stages with intermediate annealing between stages and provides for maximum number of compression cycles of at least 1020. Spring may be made of gold alloy of any colour used in jewellery industry. Spring may be made of gold alloy of 585 standard or 750 standard, or 375 standard. Spring may also be made of silver alloy of 925 standard or 875 standard.

EFFECT: invention makes it possible to develop buckle of high strength with spring made of alloy with content of precious metals and expanded arsenal of jewellery locks.

7 cl