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:
Dec. 16, 2003
Filed:
Nov. 19, 2002
Yuichi Kato, Tokyo, JP;
Satori-S-Tech Co., Ltd., Tokyo, JP;
Abstract
An AC/DC switch for electric power tools avoids bouncing when turned on, but assures quick cutting-off of heavy current. Operation does not vary with age, as might be caused by wearing of projections of the switching mechanism and/or inconsistency in spring material. A reversal spring quickly switches the mechanism on and off so that the movable contacts are brought close to the stationary contacts before the turning-on, thereby permitting the turning-on subsequent to traverse of the reversal point without bouncing of the movable contacts from the stationary contacts, and preventing movement of the movable contacts before reversal spring has stored increased energy, thus allowing quick release of stored energy to make the movable contacts leave the stationary contacts at a speed sufficient to prevent electric arcs between the movable and stationary contacts, and hence prevent the wearing of the contacts.