Twist drill

申请公布号：US5442979(A)

申请号：US19920954141

申请日期：1992.09.30

申请公布日期：1995.08.22

申请人：

GREENFIELD INDUSTRIES, INC.

发明人：HSU, GEORGE

分类号：B23B51/02;(IPC1-7):B23B51/02

主分类号：B23B51/02

摘要：A twist drill having a longitudinal axis, a shank portion sized and shaped to be grasped by a twisting tool, and a barrel portion for cutting a workpiece. The barrel portion has a number of flutes formed therein spiraling about the axis and terminating at a point end of the barrel portion. The point end has a number of point surfaces including an inner flank surface, an outer flank surface, a groove surface positioned between the inner and outer flank surfaces and a split surface. The inner flank surface extends from the center of the point end to the inner extent of the groove surface and the outer flank surface extends from the outer diameter of the point end to the outer extent of the groove surface.

Clutch device

Lead frame clock distribution for integrated circuit memory devices

Computer network having an asynchronous document data management system

Method and apparatus for detecting short circuit point between wiring patterns

Burst transmission semiconductor memory device

Container with rotatable locking lid

Combined sunbather shade and carrying case

Room air conditioner

Casting roll

4-[4'-piperodinyl or 3'-pirrolidinyl] substituted imidazoles as H3-receptor antagonists and therapeutic uses thereof

Portable cushion

Programmable built-in self-test function for an integrated circuit

Methods and systems for detecting and correcting dynamic crosstalk effects appearing in moving display patterns

Milled roadway surface

Precompression pump sprayer

Method and apparatus for the cleansing of oil from refrigerating machines and heat pumps

Substrate cooling method and apparatus

Color image forming apparatus having rotary developing device

Developing device