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:
Feb. 15, 2000
Filed:
Aug. 21, 1998
Shinichi Nakane, Okazaki, JP;
Makita Corporation, , JP;
Abstract
There is provided a structure (17) for preventing electrical leakage for use in an electric power tool, typically a grinder (1), encased in a split aluminum housing (2, 3, 4) and provided with a commutator motor (5), a pair of brush holders (12) each including a brush (13) pressed against the commutator (6a) of the motor, and a fan (8) driven by rotation of the commutator motor for drawing air from the outside of the electric power tool through a plurality of air inlets (9) formed in the housing. The split housing includes a removable rear cover (4) that can be detachably fitted on the grinder. The structure is a shield (17) that is provided between the brush holders and the air inlets, for blocking air drawn by the fan from the air inlets to the brush holders. The shield is a substantially symmetrical element which includes a center portion (18) clamped between the removable part and the fixed part of the housing having two side edges, a pair of arm portions (19) extending outward from the side edges of the center portion, and a pair of cover portions (20) connected to the arm portions such that the cover portions are positioned close to the brush holders to block air drawn by the fan from the air inlets to the brush holders.