Invention Grant
- Patent Title: Compact balance spring of variable section
-
Application No.: US15286949Application Date: 2016-10-06
-
Publication No.: US10018964B2Publication Date: 2018-07-10
- Inventor: Jean-Luc Helfer , Yves-Alain Cosandier
- Applicant: ETA SA Manufacture Horlogere Suisse
- Applicant Address: CH Grenchen
- Assignee: ETA SA Manufacture Horlogere Suisse
- Current Assignee: ETA SA Manufacture Horlogere Suisse
- Current Assignee Address: CH Grenchen
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: EP15191115 20151022
- Main IPC: G04B17/06
- IPC: G04B17/06 ; G04B17/32 ; G04B17/34 ; F16F1/32 ; F16F1/04 ; F16F1/10
Abstract:
A one-piece balance spring includes a single strip wound on itself between an inner coil and an outer coil. The strip has a geometry such that when the angle of contraction of the balance spring has a value of 360 degrees, there is a constant distance between each coil from the second coil to the penultimate coil.
Public/Granted literature
- US20170115629A1 COMPACT BALANCE SPRING OF VARIABLE SECTION Public/Granted day:2017-04-27
Information query
