Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1990-04-03
1991-07-02
Moore, Chris K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15347, 15412, A47L 912
Patent
active
050274694
ABSTRACT:
A vacuum cleaner comprising a fan motor disposed in a main body case thereof and having a motor with a permanent magnet stator or rotor, and a fan arranged to be rotated by the motor. A dust-collecting chamber collects dust suctioned into the main body case due to the rotation of the fan motor, and a dust-collecting filter causes the dust suctioned into the main body case to be caught in the dust-collecting chamber. A magnetic material adhesion preventing device is provided in a passage through which air flows due to rotation of the fan motor, with the magnetic material adhesion preventing device acting to prevent adhesion of fine dust composed of magnetic materials included in the air flow to a portion in the vicinity of the permanent magnet. As a result, adhesion of fine dust between the rotor and stator can be prevented thereby increasing the service life and the reliability of the vacuum cleaner.
REFERENCES:
patent: 3524211 (1970-08-01), Wolf
patent: 3591888 (1971-07-01), Takeda
patent: 4072483 (1978-02-01), Doyle
Arai Jiro
Ishii Yoshitaro
Jyoraku Fumio
Kawamata Mitsuhisa
Toyoshima Hisanori
Hitachi , Ltd.
Moore Chris K.
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