Device indicating a state due to the pressure modification

Details Device indicating a state due to the pressure modification Device indicating a state due to the pressure modification

1978-03-20

1980-11-11

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

55274, 55DIG34, 200 83R, 340607, G08B 2100

Patent

active

042335973

ABSTRACT:
The invention concerns a device indicating a state due to the pressure modification, in particular an overpressure or a vacuum pressure switch for the indication of the fullness of the dust bags in household or industrial vacuum cleaners with a diaphragm exposed on one side to the variable pressure and with a contacting action between two contact elements as caused by the diaphragm's movement.

REFERENCES:
patent: 2114105 (1938-04-01), Gerber
patent: 2230113 (1941-01-01), Hein
patent: 2468768 (1949-05-01), Malick
patent: 2803816 (1957-08-01), Alden
patent: 2900468 (1959-08-01), Joy
patent: 2927659 (1960-03-01), Pabst et al.
patent: 3018343 (1962-01-01), Grostick
patent: 3505791 (1970-04-01), Breslin
patent: 3516087 (1970-06-01), Rueger

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