Patent ID: 7882904

Claim:
An apparatus for controlling the direction of a drill bit within a wellbore, wherein said drill bit has as a drill bit axis and wherein the drill bit is connected to the apparatus, the apparatus comprising: a first housing with a first housing axis therein, said first housing having a first outer cylindrical surface having a cam end surface, said first housing having a first threaded opening having a first threaded opening axis, and wherein said first threaded opening extends from said cam end surface, wherein an axial length of said first outer cylindrical surface varies along a circumference of said cam end surface from a maximum axial length to a minimum axial length, and wherein said cam end surface comprises a cam shoulder interconnecting said maximum axial length and said minimum axial length; a second housing having a second housing axis, said second housing having a second threaded opening having a second threaded opening axis configured to engage with said first threaded opening, and wherein said second housing having an end surface; a collar having a radial collar end and a collar cam end surface, wherein a collar axial length of said collar varies along a circumference of said collar cam end surface from a maximum collar axial length to a minimum collar axial length, wherein said collar cam end surface comprises a collar cam shoulder interconnecting said maximum collar axial length and said minimum collar axial length, and wherein said radial collar end engages said end surface of said second housing and said collar cam end surface engages said cam end surface of said first outer cylindrical surface, and wherein said collar cam end surface is configured reciprocal to the cam end surface, and rotational displacement of said first housing relative to the collar will angularly displace the first housing axis from the second housing axis so that the inclination of said drill bit axis is changed.