Fluid reaction surfaces (i.e. – impellers) – With fluid passage in working member communicating with... – Air and watercraft propellers
Reexamination Certificate
2006-04-11
2006-04-11
Look, Edward K. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
With fluid passage in working member communicating with...
Air and watercraft propellers
C416S500000, C029S889720
Reexamination Certificate
active
07025568
ABSTRACT:
A fan blade (26) comprises a leading edge (44), a trailing edge (46), a concave wall portion (50) extending from the leading edge (44) to the trailing edge (46) and a convex wall portion (52) extending from the leading edge (44) to the trailing edge (46). A flexible wall (56) is arranged within the fan blade (26) to partially define a plurality of chambers (60) with an internal surface (54) of the convex wall portion (52). The flexible wall (56) is arranged substantially parallel to the internal surface (54) of the convex wall portion (52) and a plurality of walls (64) connect the internal surface (54) of the concave wall portion (50) and the flexible wall (56). The chambers (60) contain a fluid. The chambers (60) are interconnected by apertures (62) such that in operation deflection of the flexible wall (56) by vibrations of the fan blade (36) produce a flow of fluid between the chambers (60) through apertures (62), which is restricted by the apertures (62) to damp vibrations of the fan blade (26).
REFERENCES:
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patent: 2 371 095 (2002-07-01), None
Edgar Richard A
Look Edward K.
Manelli Denison & Selter PLLC
Rolls-Royce plc
Taltavull W. Warren
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