Gear cutting – milling – or planing – Milling – Process
Reexamination Certificate
2006-05-09
2006-05-09
Ashley, Boyer D. (Department: 3722)
Gear cutting, milling, or planing
Milling
Process
C409S131000, C029S889000, C029S889600, C029S889700, C416S23600R, C418S201100
Reexamination Certificate
active
07040845
ABSTRACT:
A screw compressor comprises a casing, and a male and a female rotor formed with axially twisted screw grooves and accommodated in the casing, the both rotors being rotated by timing gears fixed to the respective rotors while a desired minute gap is kept therebetween, and a method of manufacturing rotors therefor. In the screw compressor, the male and female rotors formed with axially twisted screw grooves in the casing comprise concave stripes having a minute depth and provided on the respective screw grooves to extend along directions of twist thereof, and leakage of a compressed air is less to give a high compression efficiency.
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Kameya Hirotaka
Kato Tomu
Matsumoto Kazuhiro
Antonelli, Terry Stout and Kraus, LLP.
Ashley Boyer D.
Gates Eric A.
Hitachi Industries Co., Ltd.
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