Cutting by use of rotating axially moving tool – Tool of specific diverse material
Patent
1992-01-10
1993-02-09
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Tool of specific diverse material
175432, 408231, 408713, E21B 1058, B23B 5100
Patent
active
051849259
ABSTRACT:
A center vacuum rotary drill bit including a drill bit body having a top working surface. Formed within the top working surface is a slot having disposed therein an insert positioned within a shim within the slot. The insert includes a pair of oppositely facing generally parallel side surfaces, a pair of oppositely facing generally parallel end surfaces extending between and interconnecting said side surfaces, a pair of oppositely inclined top surfaces extending between and interconnecting said side and end pairs of surfaces, and a bottom surface having a concave depression formed therein. The bottom surface extends transversely to and interconnects the side and end pairs of surfaces. A support bar including a convex top surface is disposed within the slot between the insert bottom surface and the slot such that the convex top surface supports the concave depression of the insert. In a preferred embodiment, the modulus of elasticity of the support bar is greater than the modulus of elasticity of the shim.
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Shirk Steven D.
Woods Gerald L.
Bishop Steven C.
Kennametal Inc.
Meenan Larry R.
Porcelli James G.
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