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:
Nov. 17, 2015
Filed:
Dec. 05, 2013
Seiko Instruments Inc., Chiba, JP;
SEIKO INSTRUMENTS INC., , JP;
Abstract
A balance includes a balance staff pivotally supported rotatably and a balance wheel arranged around the balance staff. The balance wheel has one end portion fixed to a connection arm radially connected to the balance staff and a free end portion configured to be radially deformed. The balance wheel has a first rim connected to the connection arm and a second rim in overlapping relation with the first rim and formed of a material having a linear expansion coefficient different from the first rim. The first and second rims are arranged in a circumferential direction and are bonded together by melting portions formed of melted materials of the first and second rims. The melting portions are formed on upper and lower surfaces of and in an intermediate position between the first and second rims.