Structure for prevention of electrical leakage for use in electr

Details Structure for prevention of electrical leakage for use in electr Structure for prevention of electrical leakage for use in electr

1998-08-21

2000-02-15

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

239248, H02K 714

Patent

active

060256621

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.

REFERENCES:
patent: 3603824 (1971-09-01), Csaki
patent: 3919574 (1975-11-01), Schmuck
patent: 4069624 (1978-01-01), Henry, Jr.
patent: 4491752 (1985-01-01), O'Hara et al.
patent: 4680495 (1987-07-01), Chiampas et al.
patent: 5443553 (1995-08-01), Shiga et al.
patent: 5753993 (1998-05-01), Steidle et al.

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