Screw tap with lubrication and extraction bores
OwnerCarl M. Menainventor
Life of this patent
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Abstract
A tap for forming threads on the inside of a bore which includes a hexagonal central pilot bore and transverse dihedral shafts constituting means for extracting a tap broken within a bore and also constituting means for depositing lubrication or coolant or introducing pressurized air to the cutting dies of the tap. Slots are formed in the distal end of the tap to allow a flat bladed instrument to be inserted for removal of a broken tap part.
Claims10
A tap for forming internal threads on the inner wall of a bore, said tap including a longitudinally extending shank portion and an external threaded portion, said threaded portion being interrupted by at least one but less than six longitudinally extending flutes, said threaded portion terminating in a distal end, and a longitudinal cavity in the tap, said longitudinal cavity having an hexagonal cross-section and constituting means for rotating said tap by a mating tool having an hexagonal cross-section.
A tap for forming internal threads on the inner wall of a bore, said tap including a longitudinally extending shank portion and an external threaded portion, said threaded portion being interrupted by at least one longitudinally extending flute, said threaded portion terminating in a distal end, and a longitudinal cavity in the tap, said longitudinal cavity having a polygonal cross-section and constituting means for rotating said tap with a mating tool, the polygonal cross-section having a number of sides greater than the number of longitudinal flutes.
Dependencies are inferred from the claim text.