Title:
メインばね
Document Type and Number:
Japanese Patent JP6754866
Kind Code:
B2
Abstract:
A timepiece mainspring including, in the manufactured state, an eye and a portion formed of coils with an outer coil of radius R, the eye and the portion formed of coils being connected by a neck portion having substantially zero curvature, the timepiece mainspring wherein the neck portion has a length LC comprised between 1.5 and 10 times, and preferably between 2 and 8 times, the radius R. The mainspring having this specific geometry reduces the risk of premature breakage during use, typically for an application with a k factor lower than 10.
Inventors:
Jonah Vano
Christian Charbon
Christian Charbon
Application Number:
JP2019097324A
Publication Date:
September 16, 2020
Filing Date:
May 24, 2019
Export Citation:
Assignee:
Niva Rocks-Far Society Anonymous
International Classes:
G04B1/14
Domestic Patent References:
| JP2017142215A | ||||
| JP2016528377A |
Foreign References:
| CH707861A3 | ||||
| DE102008041778A1 | ||||
| US4464216 |
Attorney, Agent or Firm:
Shigeki Yamakawa
Masaki Yamakawa
Masaki Yamakawa