Patent ID: 8590125

Claim:
A device for burnishing a surface of a work piece, said device comprising: a body defining a cavity along a longitudinal axis with said body rotatable about said longitudinal axis; an actuator disposed in said cavity of said body and rotatable about said longitudinal axis concurrently with said rotation of said body and said actuator movable along said longitudinal axis between a first position and a second position; a modular insert coupled to said actuator and movable radially relative to said longitudinal axis between a retracted position when said actuator is in said first position and an extended position when said actuator is in said second position; a support coupled to said modular insert and having a burnishing member with said support movable with said modular insert radially relative to said longitudinal axis between said retracted position when said actuator is in said first position for preventing engagement of said burnishing member with the surface of the work piece and said extended position when said actuator is in said second position for allowing engagement of said burnishing member with the surface of the work piece; a biasing apparatus coupled to said modular insert and engaging said support to apply a first force to said support and said burnishing member with said support being rotatable relative to said modular insert in response to a reaction force for improving a finish of the surface of the work piece when said burnishing member engages the surface; wherein said biasing apparatus includes a first biasing mechanism coupled to said modular insert along a first axis with said first biasing mechanism engaging said support to apply said first force to said support along said first axis; wherein said biasing apparatus includes a second biasing mechanism coupled to said modular insert along a second axis with said first and second axes being spaced from each other such that said second biasing mechanism engages said support to apply a second force to said support along said second axis; and a pin disposed through said modular insert and said support along a pivot axis for coupling said support to said modular insert with said support rotatable about said pivot axis in response to said reaction force.