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:
Jan. 05, 1993
Filed:
Dec. 24, 1991
Tadashi Yasui, Kyoto, JP;
Shinichi Miyamoto, Kyoto, JP;
The Japan Storage Battery Co., Ltd., Kyoto, JP;
Abstract
A speed changing mechanism for use with an electric rotary tool, an electric press-attaching tool, an automatic screw tightening tool or the like, includes planet gears, a planet gear support plate integrally formed with an internal gear and provided with an external gear formed outwardly of the internal gear. The planet gears are rotatably supported by a second planet gear support plate mounted on a driven shaft and formed with a second external gear. The planet gears are engaged with the interanl gear and a sun gear provided on a one-way clutch. A cylindrical member having an internal gear is slidably fitted with at least one of the first and second external gears. The speed changing mechanism can be set to have a ratio of the rapid rotation speed to the slow rotation speed of 2.5/1 or less.