Societe Nationale D'etude Et De Construction De Moteurs D'aviation

Maurice Jean Cabaret

Gerard E Jourdain

Didier Merville

Christophe Jean Champenois

Gilles Rouge

Bernard Gilbert Roy

Christophe G Gourio

Francedillaois Masson

Gilles A Le Rumeur

Michel Lebrun

Jean Pierre Leboulanger

Jean-Pierre Poitevin

Daniel Marcel Lavocat

Bruno Tournaire

Christian Thierry Daude

The cutting end or head of a helically grooved drill bit is of generally hemispherical shape and has four cutting lips, two of which are disposed in end-to-end relationship at the point S of the bit. The cutting angle of the edge of each lip is evolutive, varying from 0.degree. at the point S to a value, determined experimentally in accordance with the material to be machined, at a position P at the intersection of the cutting edge with the end of the outer diameter d of the bit.

Drill bit having a hemispherical head with an evolutive cut

A gas turbine engine impeller having a plurality of blades attached to a rotor disk and an integral, annular collar defining openings through which the blades extend which acts as a platform extending between the adjacent blades. The annular collar is formed as an integral, annular structure and may be formed from a composite material, or other material which is resistant to high temperatures and high centrifugal forces. The annular collar defines a plurality of openings to accommodate the blade portion of the plurality of blades and to enable the blades to extend radially outwardly from the collar. The openings may be formed in the annular collar when the collar itself is formed, or may be machined therein after the collar has been fabricated.

Gas turbine engine impeller having an annular collar platform

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Ponthierry, France

Maurice Jean Cabaret