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. 19, 2016
Filed:
Oct. 18, 2013
Black & Decker Inc., Newark, DE (US);
John C. Vanko, Timonium, MD (US);
Michael K. Forster, White Hall, MD (US);
Matthew J. Velderman, Baltimore, MD (US);
John Howson, Sparks, MD (US);
BLACK & DECKER INC., New Britain, CT (US);
Abstract
A handheld grinder comprising a housing; a grinding disk; a motor; an output shaft connected to the grinding disk and the motor to impart rotary motion thereto; and a circuit board residing in the housing and having thereon a rectifier that receives an alternating current and converts the alternating current to a direct current, a switching arrangement having a plurality of motor switches connected electrically between the rectifier and the motor and operates to deliver the direct current from the rectifier to the motor, a capacitor connected electrically between the rectifier and the switching arrangement, wherein the capacitor is coupled in parallel across the rectifier, a driver circuit interfaced with the motor switches and operable to control switching operation of the motor switches, and a power switch connected electrically between the rectifier and the driver circuit and operable to selectively energize the driver circuit and power on the grinder disk.