Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Reexamination Certificate
2005-01-04
2005-01-04
Snider, Theresa T. (Department: 1744)
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
C015S347000
Reexamination Certificate
active
06836930
ABSTRACT:
An airflow indicator for a vacuum cleaner is provided. The airflow indicator comprises a housing mounted to a casing of the vacuum cleaner. A piston chamber is defined within the housing. A piston is received in the piston chamber and is movable therein between a first position and a second position. A first port is formed in the housing and communicates with the piston chamber. The first port is open to ambient. A second port is formed in the housing and communicates with the piston chamber. The second port is spaced from the first port and is open to the filter chamber of the vacuum cleaner. A valve is mounted to the housing for obstructing air passage into the piston chamber. The valve includes a diaphragm having a slit that opens in response to a predetermined pressure differential between the first port and the second port.
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Barbeck Craig
Cipolla Mark E.
Paliobeis Steven J.
Thur Charles J.
Fay Sharpe Fagan Minnich & McKee LLP
Royal Appliance Mfg. Co.
Snider Theresa T.
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