(under the class definition) Apparatus wherein an impeller* is adapted to assume a more compact form by folding, pivoting, collapsing or similar movement of a working member* so as to render the member inoperative or to facilitate storage.
(1) Note. This definition does not include a mere adjustable (e.g., feathering) working member wherein the inoperative position is no more than the terminal position of a plurality or range of operative positions.
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85+, for an impeller selectively moveable to or from an operative position relative to a float support.
87+, for a rotating impeller which is adapted to assume a more compact form by shortening the effective operative
