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:
Apr. 18, 1989
Filed:
Feb. 09, 1988
Ryobi Ltd., Hiroshima, JP;
Abstract
A backlash prevention adjustment mechanism for a backlash prevention device includes a first magnet, a second magnet, and a nonmagnetic electroconductive member provided therebetween, being rotatable with a spool shaft, and having an eddy current induced therein by the first and second magnet to provide a braking force for the spool to prevent backlash. A motor is provided to move the first magnet relative to the second magnet to change the level of the eddy current. A lever is also provided to manually move the first magnet with respect to the second magnet. In another aspect, a shielding yoke is provided on the first magnet and is movable therewith to position a slit in the yoke proximate a first magnetism sensor or a second magnetism sensor to detect positions thereof corresponding to maximum and minimum levels of the eddy current.