Patent ID: 7360609

Claim:
A drilling apparatus comprising: a) a general apparatus housing, arranged to function as a serial element of a drill string, comprising an upper housing and a lower housing, the upper and lower housings connected by a tilted bearing permitting limited rotation between the upper and lower housings, the upper and lower housings having independent center lines, said upper housing having a tool joint connection for attachment to a drill string; b) a drilling fluid powered motor, in the general housing, connected to an output shaft arranged to attach to, and to drive, a drill bit; c) a drilling fluid by-pass channel, in said general housing, to by-pass said motor; d) a mode selector in the upper housing responsive to manipulation of the drilling fluid flow rate to engage and actuate a drilling fluid by-pass valve; e) said drilling fluid by-pass valve, in the general housing, responsive to said mode selector, to open or close said drilling fluid flow by-pass channel; f) a one-way clutch, driven by the output shaft, that resists dis-engagement, arranged to allow the lower housing to drive the drill bit clockwise but allowing the drill bit to rotate clockwise relative to the lower housing, the resistance arranged to rotate the lower housing clockwise relative to the upper housing before dis-engagement; and g) said tilted bearing that allows the lower end of the housing to rotate a limited amount relative to the upper housing to deflect the lower housing centerline relative to the centerline of said upper housing.