The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 13, 2004
Filed:
Mar. 18, 2002
Florian Serex, Prêles, CH;
Frédéric Leuba, La Chaux-de-Fonds, CH;
Denis Burdet, Neuchâtel, CH;
ETA Sa Fabriques d'Ebauches, Grenchen, CH;
Abstract
The timepiece includes a time base ( ), a generator ( ) formed in particular of a rotor ( ) with permanent magnets and at least one coil ( ), a barrel ( ) with a mainspring coupled to said generator in order to drive it, analogue time indicating means ( ) also driven by said barrel. These time indicating means operate substantially synchronously relative to said time base as long as the torque C provided by said barrel is greater than or equal to a minimum synchronisation torque C . The timepiece also includes means ( ) for braking said generator, magnetised means ( ) having with the rotor, when the generator is stopped, a static positioning torque C allowing said rotor to be kept in a substantially stationary position. The generator braking means are activated as soon as the time indicating means are no longer operating in a substantially synchronised manner with the time base, and the magnetised means are arranged such that the static positioning torque C is greater than or substantially equal to a reference torque C for which the torque C exerted by the barrel on the rotor is equal to said minimum synchronisation torque C .