Fluid reaction surfaces (i.e. – impellers) – Working member foldable – pivotable or collapsible to non-use...
Patent
1977-02-14
1978-04-11
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Working member foldable, pivotable or collapsible to non-use...
416231A, 366329, B01F 718
Patent
active
040836533
ABSTRACT:
A stirring device employs a shaft-mounted hub with five axially nested, radially extendable fins shaped to not only provide compact nesting of five fins to enter a bung opening of a drum, but also to provide ample surface area when extended for stirring.
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patent: 2896926 (1959-07-01), Chapman
patent: 3030083 (1962-04-01), Stiffler
patent: 3455540 (1969-07-01), Marcmann
patent: 3559962 (1971-02-01), Enssle
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