Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1993-08-18
1995-04-11
Scherbel, David A.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15339, A47L 919
Patent
active
054046122
ABSTRACT:
A vacuum cleaner rotates a propeller fan by its suction force. The propeller fan rotates a rotor of a d.c. electric energy generator so as to generate electrical energy, and a d.c. voltage corresponding to the suction force is obtained by the generation. The vacuum cleaner employs the d.c. voltage as an operating voltage for a dust sensor and the peripheral circuitry thereof. The vacuum cleaner compares the d.c. voltage with a constant voltage output from a constant-voltage circuit by a comparing circuitry. The vacuum cleaner lowers the gain of an amplifying circuitry based upon a signal output from the comparing circuitry in correspondance to an increasing of the d.c. voltage obtained by the d.c. electric energy generator. The amplifying circuitry amplifies output of the dust sensor. The vacuum cleaner automatically determines detection sensitivity to be a proper sensitivity. The detection sensitivity is the sensitivity for detecting dust, based upon an output from the dust sensor.
REFERENCES:
patent: 4601082 (1986-07-01), Kurz
patent: 5033151 (1991-07-01), Kraft
patent: 5144715 (1992-09-01), Matsuyo
patent: 5163202 (1992-11-01), Kawakami
patent: 5182833 (1993-02-01), Yamaguchi
patent: 5233682 (1993-08-01), Abe
Japanese Patent Abstract for Japanese Laid-Open Patent Application No. JP-A-3237955, published Oct. 23, 1991, entitled "Vacuum Cleaner" by Imia Hidetoski et al, Abstract vol. 016025 dated Jan. 22, 1992.
Scherbel David A.
Till Terrence R.
Yashima Electric Co., Ltd.
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