Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Axially extending shroud ring or casing
Patent
1989-09-05
1991-09-03
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Rotor having flow confining or deflecting web, shroud or...
Axially extending shroud ring or casing
416247A, 440 67, 440 71, B63H 116
Patent
active
050448846
ABSTRACT:
An inherently safer propeller design is disclosed. A conventional propeller has a substantially cylindrical ring affixed to the distal ends of the blades. Preferably, the leading edge of the ring extends beyond the forward most extending portion of the leading edges of the blades. The leading edge of the ring is constructed to absorb the energy of impact with an object. In this manner, damage to the object is substantially reduced. The propeller of the present invention presents a design which, in certain preferred embodiments, substantially eliminates the possibility of severe injury when a moving propeller collides with a human or animal. Preferably, the energy absorbing leading edge is comprised of a hollow sheet metal section, which may be foam-filled. Alternatively, the leading edge may be comprised of an elastomer or other material which absorbs energy. Several ways of attaching the leading edge to the ring to create a detachable and replaceable structure are disclosed. The structural advantages presented by the ring permit propellers to be designed with thinner blades, O skew and other advantageous features not previously practical.
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Pollini Richard J.
Thibault Laurence E.
Larson James A.
Look Edward K.
Trustees of the University of Pennsylvania
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