Appeal No. 96-3374
Application No. 08/115,974
Claim 1
We will sustain the rejection of claim 1 under 35 U.S.C.
§ 103.
Independent claim 1 sets forth a low friction cam shaft
comprising, inter alia, a shaft member and a cam secured to
the shaft member. The cam has a base circle portion and a
lobe portion made of one metal material having one density.
The base circle portion has an interior portion made of
another metal material of another density. The interior
portion has a porosity less than the lobe portion and the
remainder of the base circle portion. The base circle portion
and the lobe portion have an outer surface with an open
porosity and a solid film lubricant is impregnated in the open
porosity of that outer surface of the cam.
As shown in Figure 2, Oda discloses a tappet cam assembly
including a metal cam 11 and a ceramic tappet 13. The outer
surface of the metal cam 11 is coated with a solid lubricant
and a binder 12 to provide excellent wear-resisting and
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