FIELD: physics.
SUBSTANCE: presented mainspring (21) comprises a folded metal strip (23) including an outer turn including an increased thickness portion (25) constituting a single piece with a strip (23) between the beginning of the outer turn and in front of the free end of the outer turn that forms the base, extending radially with a substantially constant thickness towards the outer part of the mainspring, and, at least, one second strip (22, 24) forming the coupler (27), which is a single piece with the strip (23), extends from the base and, at least, partially, along the outer portion of the non-thickened outer coil of the mainspring (21).
EFFECT: simplifying the stages of manufacturing mainsprings of small dimensions with a significant reduction in the waste volume.
12 cl, 7 dwg
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