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:
Oct. 26, 2004
Filed:
Jul. 01, 2003
Kazunori Yamada, Tokyo, JP;
SMK Corporation, Tokyo, JP;
Abstract
The double action push switch has a longer life and more design freedom for attaining desired load characteristics for first and second switching actions so that it occupies less area on a printed circuit board. Two plate members are housed side-by-side in a cavity of the push switch. An operating portion of a key top is positioned so that P ≠P , where P and P are the respective operating loads applied to the operating portion when one or the other of two pressing points act as the fulcrum and moments on the key top are balanced. The operating portion is positioned offset from a center vertical axis of the key top if both plate members have the same load characteristics. Thus, a first pressing force inverts one plate member for a first electrical connection, and the next pressing force inverts the other plate member for a second electrical connection.