Blades

Details Blades Blades

2006-09-26

2006-09-26

Look, Edward K. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Laminated, embedded member or encased material

C415S009000, C416S232000, C416S24100B

Reexamination Certificate

active

07112044

ABSTRACT:
Percussive impacts due to bird strikes upon the hollow fan blades20are a well known problem. These percussive impacts not only deform previous fan blades but also reduce their stiffness. In accordance with the present invention, hollow fan blades20incorporate a cavity23within which, a matrix24with embedded expandable elements25, is located. Thus, upon a percussive impact these expandable elements25are released in order to create an internal pressure within the cavity25which acts outwardly in order to relieve deformation and also stiffen the blade20as a result of the over pressure within the cavity23.

REFERENCES:
patent: 3396923 (1968-08-01), Windecker
patent: 5042968 (1991-08-01), Fecto
patent: 2002/0090302 (2002-07-01), Norris
patent: 0 561 716 SP (1944-06-01), None
patent: 1 323 883 SP (1973-07-01), None
patent: 2 041 829 (1980-09-01), None
patent: 9 089 709 AB (1997-04-01), None

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