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:
Feb. 19, 2013
Filed:
Oct. 08, 2008
Olivier Mertenat, Solothurn, CH;
Olivier Mertenat, Solothurn, CH;
Montres Jaquet Droz SA, La Chaux-de-Fonds, CH;
Abstract
A driving member for a timepiece movement comprises two superimposed coaxial barrels () coupled in series, each barrel including a spring provided in a cylindrical housing rotatingly mounted on a common shaft (). The respective housings () of the barrels are positioned opposite each other and do not include a lid, and the springs () are separated only by a separation washer () or a gap. This arrangement can be used for increasing the height (H) of the springs, and thereby the amount of energy and the power reserve of the watch for an identical global volume of the driving member, or for reducing the total height of the driving member. Such a driving member is particularly intended for watches with a high power reserve.