Vacuum cleaner including automatic shutoff device

Details Vacuum cleaner including automatic shutoff device Vacuum cleaner including automatic shutoff device

1980-07-18

1981-10-13

Lacey, David L.

Gas separation

With nonliquid cleaning means for separating media

Solid agent cleaning member movingly contacts apparatus

55214, 55274, 55DIG3, 15339, 15DIG11, B01D 4646, A47L 912

Patent

active

042945950

ABSTRACT:
An automatic shutoff arrangement for a vacuum cleaner of the "clean air" type in which the vacuum fan is downstream of the dirty air passageway and vacuum filter. The automatic shutoff arrangement includes an apparatus for sensing a selected characteristic of the air flow at a first point adjacent the entrance to the dirty air passageway and at a second point along the clean air passageway between the vacuum filter and fan and operates in response to a relative change in the selected characteristic between such points to interrupt power to the vacuum motor and/or indicate to the operator that the dirty air passageway is obstructed or vacuum filter is full.

REFERENCES:
patent: 2737262 (1956-03-01), Ferraris
patent: 2954751 (1960-10-01), Barnes, Jr.
patent: 3073097 (1963-01-01), Hallett et al.
patent: 3172743 (1965-03-01), Kowalewski
patent: 3587514 (1971-06-01), Autrand
patent: 4020525 (1977-05-01), Fromknecht et al.
patent: 4040042 (1977-08-01), Mayer
patent: 4184225 (1980-01-01), Leinfelt

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