Patent ID: 8061446

Claim:
A coring tool for use in a borehole formed in a subterranean formation, comprising: a tool housing adapted for suspension within the borehole at a selected depth; a coring aperture formed in the tool housing; a core receptacle disposed in the tool housing; a bit housing disposed within the tool housing; a coring bit mounted within a coring bit assembly, the coring bit assembly being movably disposed in the bit housing; a bit motor operably coupled to the coring bit and adapted to rotate the coring bit; a series of pivotably connected extension link arms; a first piston adapted to actuate the coring bit between the retracted and extended positions; a first rotation link arm having a first end pivotably coupled to the tool housing and a second end pivotably coupled to the bit housing to rotate the bit housing between an eject position, in which the coring bit registers with the core receptacle, and a coring position, in which the coring bit registers with the tool housing coring aperture; a second rotation link arm having a first end pivotably coupled to the tool housing and a second end pivotably coupled to the bit housing thereby to further control rotation of the bit housing between the eject and coring positions; and a second piston operably coupled to the bit housing and adapted to actuate the bit housing between the eject and coring positions; wherein the series of extension link arms comprises: a scissor jack; a follower link arm; and a rocker arm pivotably mounted on the bit housing and having a first segment pivotably coupled to the follower link arm and a second segment pivotably coupled to the scissor jack.