Inserts having two components anchored together at a non-perpendicular angle of attachment for use in rotary type drag bits

Claim 1

An insert for a rotary drag bit which is used for material cutting purposes comprising: an engaging element having a central axis, an anchoring end, a contacting surface end with a super abrasive material desposited thereon, and a side portion substantially concentric about said central axis and connecting said anchoring end and said contacting surface end, said central axis passing through said contacting surface end and said anchoring end, and said anchoring end having a back surface and more than one protrusion extending outwardly from said back surface; a shank portion with a shank axis and having a fitting end for inserting in said rotary drag bit and a receiving end for receiving said engaging element, said receiving end having more than one recess; said protrusions of said anchoring end of said engaging element having sloping walls which meet said back surface at a non-perpendicular angle, said protrusions mating in interfitting relation with said recesses of said receiving end of said shank portion and forming a mating profile such that said mating profile is in the form of a convoluted line; and said central axis intersecting said vertical axis at an obtuse angle and said contacting surface end of said engaging element is positioned at a negative rake for material cutting.