Fabricated tube control cam shafts

Claim 1

A hollow shaft entirely of uniform thickness with cam means thereon, especially a cam shaft for internal combustion engines, which comprises in combination a tubular member including cam means forming a single integral piece with and pressed out of said tubular member, integral bearing means pressed out of said tubular member having entirely uniform thickness continuously therewith, said cam means having inclined side flanks gradually merging integrally with adjacent areas of said cam means, said bearing means having lateral flanks gradually Merging integrally with adjacent areas of said bearing means, said cam means having inclined side flanks gradually merging integrally with adjacent circumferential areas of said hollow shaft, said bearing areas having lateral flanks gradually merging integrally with adjacent circumferential areas of said hollow shaft, said cam means being pressed out with entirely uniform thickness as to the hollow shaft subjected to electromagnetic force as internal pressure thereby resulting in external-die-conforming deformation to assure uniform thickness of said cam means compared with the entire hollow shaft to assure strength for force transmittal by said cam means rather than weakening thereof which would occur with thinning in the area of the cam means now precluded from occurring to avoid disadvantages of brittleness and lack of strength.