Vacuum cleaner with function to adjust sensitivity of dust senso

Details Vacuum cleaner with function to adjust sensitivity of dust senso Vacuum cleaner with function to adjust sensitivity of dust senso

1991-06-11

1992-04-21

Coe, Philip R.

Brushing, scrubbing, and general cleaning

Machines

With air blast or suction

15339, 15377, 250574, 356438, A47L 928

Patent

active

051055023

ABSTRACT:
A vacuum cleaner includes an agitator brush which only becomes operational when a carpeted floor is being cleaned. In order to avoid erroneous activation of a dust indicator lamp when individual strands of carpet pile are pulled onto the cleaner, a surface discrimination device lowers the sensitivity of a dust sensor circuit, which drives the lamp, when shag or high pile carpet is encountered so as to prevent erroneous signaling of the presence of dust.

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patent: 4611365 (1986-09-01), Komatsu et al.
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patent: 4920605 (1990-05-01), Takashima
patent: 4942640 (1990-07-01), Hayashi et al.
patent: 4953253 (1990-09-01), Fukuda et al.
patent: 4977639 (1990-12-01), Takahashi et al.

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