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. 20, 1988
Filed:
Jun. 30, 1987
Japan Storage Battery Co., Ltd., Kyoto, JP;
Abstract
A reduction gear mechanism, incorporating a speed changing mechanism, for use with a motor-driven drill. The mechanism includes at least one planetary speed reducer having a sun gear to which rotation of an electric motor is transmitted, a plurality of planet gears arranged around the sun gear and engaged with the sun gear, an internal gear internally engaged with the planet gears, and a planet gear holding plate which pivotally supports the planet gears on one side of it and has an output shaft on the other side of it. The internal gear of at least one planetary speed reducer includes a cylindrical internal gear. The reduction gear includes mechanisms for locking the cylindrical internal gear to prevent rotation of the cylindrical internal gear and for engaging the cylindrical internal gear with the planet gear holding plate so that the cylindrical internal gear and the planet gear holding plate rotate as a single unit.