High speed reamer attachment for coaxial drive fastener gun

A construction reamer for reaming holes for torque-shear bolts comprising:

• A dual coaxial drive fastener gun having an inner drive member and an outer drive member in coaxial alignment with one another;
• A cylindrical housing having a coupling sleeve connected to said outer drive member, said cylindrical housing having an inner cavity with a ring gear fixedly attached therein;
• A spider having a projecting end thereon engaged and connected to said inner drive member of said dual coaxial fastener gun, said spider having a plurality of identical planetary gears journaled therearound with a central opening between said planetary gears adapted to receive a central drive gear of diameter smaller than the diameter of said planetary gears and which engages each of said planetary gears, said spider and said planetary gears being positioned in said inner cavity of said cylindrical housing such that each of said planetary gears engage said ring;
• A central drive gear located within said central opening between said planetary gears of said spider and engaging each of said planetary gears, said central drive gear being adapted to be coupled to a reamer;
• A reamer removably connected to said central drive gear;
• and
• A locking mechanism connected to said dual coaxial drive fastener gun for locking the outer drive member from rotating whereby the inner drive member is free to rotate said spider at the speed of rotation of the fastener gun which, in turn, through said planetary gears rotates said central drive gear and said reamer attached thereto at a higher speed of rotation.