Patent ID: 7507058
Filing Date: 2009-03-24
Classification: B23B,B23C,H05K,Y10T

Abstract:
1. A machining element held by a chuck having slits and a lower face, said machining element comprising the combination of a hollow and cylindrical tool positioning device and a tool having an edge that is positioned by said device, said combination comprising: a hole, penetrating through a center part of said device in an axial direction of said device, receiving and holding a shank portion of the tool therein, said hole having a diameter smaller than the diameter of the shank portion of the tool; an upper face on said device located on a plane orthogonal to said axial direction, said upper face abutting the lower face of the chuck; a lower face on said device on a plane orthogonal to said axial direction; an outside face connecting an outer edge of said upper face with an outer edge of said lower face; a plurality of hollow portions extending through said device in the axial direction for allowing air to flow through said device, said hollow portions communicating with said upper face and said lower face, and said hollow portions communicating with said hole in said device along the entire extent of said hollow portions in the axial direction for having air flowing through said hollow portions flow along the tool; and a concave portion opening to said upper face of said device, communicating with said hole, and communicating with one end of said hollow portions such that said hollow portions communicate with said upper face via said concave portion, said concave portion forming a circle that (1) is concentric with said hole and (2) has a diameter such that said concave portion encompasses all of said hollow portions as viewed along the axial direction, wherein said concave portion has an area in a plane perpendicular to the axial direction that is greater than the area of said hollow portions, and whereby air from the slits of the chuck can flow to the hollow portions through said concave portion.