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US 4,124,328 AGranted
Indexable insert drill
AssigneeThe Valeron Corporation
InventorDavid Alan Hopkins
Life of this patent
Estimating the term…
Abstract
An indexable insert drill employing a pair of radially opposed inserts having either positive or negative axial lead cutting edges extending in the same cone of revolution. One of the inserts has a radially inner arcuate corner intersecting and extending across the axial center line. The other insert is located relatively overlapping but outward radially with an outermost corner adapted to finish cut the side wall diameter of the hole. Insert cutting edges provide for chip interruption and breakage.
Claims19
An indexable insert drill comprising:
- a shank;
- a pair of pockets at one end of said shank, each formed for locating an indexable polygonal insert;
- one of said pockets having means for locating a first insert with a cutting edge extending from the center of said drill obliquely to a transverse plane normal to the drill axis, with an inactive radially innermost edge, and with an inactive edge joining a radially outermost inactive bridging corner of said cutting edge;
- said other pocket having means for locating a second insert radially outward relative to said first insert with a cutting edge extending obliquely to a transverse plane normal to the drill axis equally and oppositely to said first insert cutting edge in the same cone of revolution and with its radially outermost corner providing the radially outermost cutting element joining an inactive radially outermost edge.
1 more element
Dependencies are inferred from the claim text.