Brakes – Operators – Spring
Reexamination Certificate
2011-07-05
2011-07-05
Rodriguez, Pam (Department: 3657)
Brakes
Operators
Spring
C267S161000, C267S164000, C192S10900B
Reexamination Certificate
active
07971690
ABSTRACT:
A coned disc spring is arranged between a second component and a third component provided inside a tubular first component and movable in an axial direction. The coned disc spring comprises a body having a circular dish shape, teeth closely fitting into spline grooves formed on an inner peripheral surface of the first component and projecting to a radial outer side on an outer periphery of the body, and a stress relaxation portion formed in a flat shape or a curved shape at an edge portion of a circular arc portion at the base of the tooth in a direction at least one of a circumferential direction and a radial direction of the body.
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Sengupta, “Stress Concentration Caused by Sudden Change in Form, New Jersey Institute of Technology,” 2004, XP002556086.
Lanning et al., “Effect of Notch Geometry and Stress Concentration Factor on the High Cycle Fatigue Behavior of Ti-6A1-4V,” 9thNational Turbine Engine HCF Conference, 2004, XP008080095.
European Search Report issued in European Patent Application No. 06713494.0 on Feb. 12, 2009.
Japanese Office Action for Japanese Application No. 2005-035247, mailed Feb. 23, 2011, with English-language translation.
NHK Spring Co. Ltd.
Oliff & Berridg,e PLC
Rodriguez Pam
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