Boots – shoes – and leggings
Patent
1995-08-14
1998-03-10
Trammell, James P.
Boots, shoes, and leggings
364133, 364141, 364174, 364565, 318462, 318801, 361 23, 361 51, G05B 902
Patent
active
057268819
ABSTRACT:
A centrifugal apparatus includes a rotor having a marker for generating an index signal, a motor for rotating the rotor, first and second detectors for detecting the index signal with rotation of the rotor to generate first and second detection signals, an input terminal for receiving supply power, a drive circuit for generating a drive signal from the supply power according to the first detection signal, and first and second switch circuits for controlling the supply of the drive signal to the motor. First and second judging portions are used to detect whether the first and second detection signals are respectfully generated within a given condition. The first judging portion operates the first switch circuit to stop the drive signal from being supplied to the motor when the first detection signal is not generated within the given condition, while said second judging portion operates the second switch circuit to stop the drive signal from being supplied to the motor when the second detection signal is not generated within the given condition. The first and second detectors, judging portions, and switch circuits, respectively, independently operate to provide double feedback loops, so that an overspeed or the like is prevented.
REFERENCES:
patent: 4903191 (1990-02-01), Fries
patent: 5229693 (1993-07-01), Futami et al.
patent: 5280228 (1994-01-01), Kanouda et al.
patent: 5422570 (1995-06-01), Moreira
patent: 5446354 (1995-08-01), Hiruma
patent: 5469032 (1995-11-01), Otake
Inaniwa Masahiro
Kawanobe Osamu
Kido Nobuharu
Matsufuji Noriyasu
Niinai Yoshitaka
Hitachi Koki Co,. Ltd.
Trammell James P.
Wachsman Hal D.
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