Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Hollow
Reexamination Certificate
2005-08-15
2008-12-02
Edgar, Richard (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Hollow
C416S22300B
Reexamination Certificate
active
07458780
ABSTRACT:
Hollow fan blades for turbo fan gas turbine engines are formed of two separate detail halves. Each detail half has a plurality of cavities machined out to reduce weight and form ribs. The ribs extend continuously and without intersecting one another in order to facilitate machining. The ribs extend in different directions in different regions of the detail half. In at least one region, the ribs extend in a serpentine pattern, such that concatenated rib segments are substantially perpendicular to one another, thereby providing stiffness in multiple directions.
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Graves William R.
Weisse Michael A.
Carlson & Gaskey & Olds
Edgar Richard
United Technologies Corporation
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