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:
Jul. 23, 1996
Filed:
Sep. 29, 1994
Applicant:
Inventor:
Henri-Michel Guignard, Cossonay, CH;
Assignee:
Frederic Piguet S.A., Le Brassus, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G04B / ;
U.S. Cl.
CPC ...
368140 ; 185 37 ;
Abstract
The mainspring (3) is coiled inside a barrel at an angle .alpha.=n2.pi. radians. The spring has a rectangular section of a constant width. At least one first portion of the spring extending from the wall (2) of the barrel towards the core (5) has an increasing thickness e selected so that the coiling angle .alpha. times the cubed value of the thickness e has a constant value, namely .alpha..e.sup.3 =constant. One thus obtains, at least in the effective part, namely conventionally the first twenty four hours of operation, a constant force supplied by the barrel and consequently a constant amplitude of the balance.