Abstract: An anchoring mechanism for preventing the counter-rotation of a motor driven wrench in reaction to the torque produced by the turning of a tool member therein has a multiplicity of members tandemly hinged together, one end member having elements for attaching to a motor driven wrench and the other end member having elements for securing to a fixed reference base whereby the motor driven wrench is prevented from rotating in reaction to the turning of a tool member therein.

Abstract: There is disclosed an attachment for a counter-rotating coaxial drive fastener gun having a cylindrical housing adapted to be threadably attached to the outer drive member of a coaxial drive fastener gun and having an inner cavity with a ring gear fixedly attached therein. A spider has a projecting end thereon adapted to engage the inner drive of the coaxial drive fastener gun and further has a plurality of planetary gears journaled therearound and is inserted into the inner cavity of the cylindrical housing with the planetary gears engaging the ring gear. A central drive gear of smaller diameter than the planetary gears is inserted into a central opening between the planetary gears and engages each of the planetary gears. A reamer is removably coupled to the central drive gear and rotated thereby.

Abstract: There is disclosed a universal or swivel joint having a ball member with an axis of rotation and a projection of substantially spherical shape centered on the axis, the surface of the projection containing a plurality of facets aligned with and uniformly and symmetrically positioned angularly around the axis of rotation, and a socket member having an axis of rotation and a receptacle centered on the axis which receptacle receives and mates with the ball member, the receptacle having an interior surface containing a plurality of facets aligned with and uniformly and symmetrically positioned angularly around the axis of rotation of the socket member, each of the facets of the receptacle mating with and being positioned in sliding engagement with a respective facet of the ball member.