Patent ID: 6203410
Filing Date: 2001-03-20
Classification: B24B

Abstract:
A reamer with adjustable expansion/contraction, comprising:a reamer body composed of a hollow shuttle section and a cylindrically shaped grinding section, said shuttle section having a rotation shaft with a built-in threaded cylinder designed so as to be externally operable, said grinding section having a plurality of axially-extending slits provided at equal intervals in its peripheral wall and having a tapered inner peripheral surface extending from the upper section of the slits to an opening end thereof; anda slide shaft provided inside the reamer body, having a threaded shaft at one end and an axial guide hole in the middle section thereof and being connected with a diameter expansion member at the other end,said slide shaft and said rotation shaft being threadedly engaged and connected to each other inside said shuttle section via said threaded shaft, a guide pin being inserted from the shuttle-section side through said guide hole to convert the rotational motion of said rotation shaft into linear motion of said slide shaft so that said diameter expansion member which is moved with said slide shaft in an axial direction is capable of freely adjusting the outer diameter of said grinding section.