Fluid reaction surfaces (i.e. – impellers) – Specific working member mount – Blade received by continuous circumferential channel
Reexamination Certificate
2006-04-18
2006-04-18
Look, Edward K. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Specific working member mount
Blade received by continuous circumferential channel
C416S21900R
Reexamination Certificate
active
07029237
ABSTRACT:
The invention relates to a method of improving the retention capacity of a blade having an asymmetrical hammerhead connection and extending in a conical stream, with the root of the blade being retained in a peripheral groove in a disk, said groove having an upstream lip and a downstream lip presenting respective bearing surfaces that extend in planes that are asymmetrical relative to planes perpendicular to the axis of rotation of said disk, and against which the surfaces of the upstream and downstream flanks of said root come to bear, the bearing surface of said upstream lip being connected to the bottom wall of said groove via a rounded surface, and the upstream flank presenting, in the vicinity of said rounded surface, a heel situated inside a circle of radius R centered on the axis about which said blade tends to pivot when axial stress is applied thereto, said circle outlining, in the upstream lip, a crescent shape of thicknesse, wherein:a) the connection between the bearing surface of the upstream lip and the bottom wall of the groove is modified by removing material from said disk; andb) said disk is fitted with blades in which the upstream flanks present respective heels of greater volume so as to increase the value of the radius R and the value of the thicknesse.
REFERENCES:
patent: 3165294 (1965-01-01), Anderson
patent: 5584658 (1996-12-01), Stenneler
patent: 0 695 856 (1996-02-01), None
patent: 2 504 975 (1982-11-01), None
patent: 2 571 099 (1986-04-01), None
Follonier Christophe
Lejars Claude
Mace Jerome
Pontoizeau Bruce
Reghezza Patrick
Look Edward K.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Snecma Moteurs
White Dwayne J
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