Fluid reaction surfaces (i.e. – impellers) – Specific working member mount – Adjustable
Patent
1977-07-28
1979-04-24
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Specific working member mount
Adjustable
416208, B63H 312
Patent
active
041509218
ABSTRACT:
Marine propellers are constructed with a split-hub design, permitting adjustment of the pitch of the blades, and axial removability of the blade. By virtue of the axial removability of the blades, blades can be removed easily for repair or replacement without increasing the diametral clearance between the blade tips and a tunnel or nozzle of the type in which propellers are frequently disposed. Also, individual blades can be removed without the necessity of dropping the rudder, which is necessary in many vessels utilizing solid propellers. The blades have their spindles or roots clamped in the hub, such that axial adjustment of pitch can be achieved by reducing the clamping force. The hub preferably is formed in two sections, one section being mounted to or forming part of the propeller shaft, and including recesses which partially house the blade spindles or roots. The other section preferably is made up of a plurality of independently removable clamping segments, each of which is formed with a recess which cooperates with a recess in the first section to house a blade spindle, and clamp the spindle in a fixed blade pitch position. By removal of a selected clamping segment, its blade can be removed axially rearwardly without necessitating substantial diametral clearance at the blade tips. Bolted connections are used between the clamping segments and the first section of the hub so as to facilitate both pitch adjustment and blade removal.
REFERENCES:
patent: 2232670 (1941-02-01), Barrett
patent: 2574951 (1951-11-01), Benson
patent: 3073395 (1963-01-01), Duncan
patent: 3130677 (1964-04-01), Liebhart
patent: 3294175 (1966-12-01), Bodner
Eastman Mark E.
Wennberg Peder K.
Powell Jr. Everette A.
Propulsion Systems, Inc.
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