Material removing bit

Claim 2

A rotatable material removing bit, comprising: a. a mounting collar having a neck constructed for connection to a rotating drill rod; b. at least two elongated and outwardly bowed cutting blades constructed from metal leaf spring material, having a set of inner cutting blade ends secured in cantilevered relationship to the mounting collar and an outer set of cutting blade ends spaced from one another; c. at least one mounting pad secured to the external or convex face of each cutting blade, carrying an abrading bar constructed from composite rod material; and, d. cutting pressure regulating means including a spacing adjustment aperture formed through an outer end of one cutting blade with a set screw positioned in the aperture for engagement with a striking area of the other cutting blade.

Claim 3

The structure according to claim 1 wherein the composite rod material consists of approximately 65 per cent tungsten carbide and 35 per cent matrix rod or binder.

Claim 4

The structure according to claim 2 wherein the tungsten carbide consists of approximately 81 per cent tungsten, 13 per cent cobalt, 4 per cent titanium and 2 per cent tantalum, and, the matrix rod or binder consists of approximately 43 per cent copper, 40 per cent zinc, 10 per cent nickel and 7 per cent silicon.

Claim 5

The structure according to claim 1 wherein; each cutting blade has at least two mounting pads and the outermost portions of the abrading bars are sharp cutting peaks.

Claim 6

The structure according to claim 1 including: a coolant distribution means in the mounting collar and neck.

Claim 7

The structure according to claim 5 wherein; the coolant distribution means includes a central passageway in the neck and at least a pair of branch line passageways in the mounting collar that terminate in exit ports.

Claim 8

A rotatable material removing bit, comprising: a. a mounting collar having a neck constructed for connection to a rotating drill rod; b. at least two elongated and outwardly bowed cutting blades constructed from metal leaf spring material, having a set of inner cutting blade ends secured in cantilevered relationship to the mounting collar and an outer set of cutting blade ends spaced from one another; c. at least two mounting pads secured to the external or convex face of each cutting blade; d. an abrading bar with a sharp cutting peak secured to the outermost portion of each support pad, the abrading bar being constructed from composite rod material, consisting of approximately 65 per cent tungsten carbide and 35 per cent matrix rod or binder; e. a coolant distribution means in the mounting collar and neck, including a central passageway in the neck and at least a pair of branch line passangeways in the mounting collar that terminate in exit ports; and, f. cutting pressure regulating means including a spacing adjustment aperture formed through an outer end of one cutting blade with a set screw positioned in the aperture for engagement with a striking area of the other cutting blade.

Claim 9

A rotatable material removing bit, comprising: a. a mounting collar having a neck constructed for connection to a rotating drill rod; b. at least two elongated and outwardly bowed cutting blades constructed from metal leaf spring material, having a set of inner cutting blade ends secured in cantilevered relationship to the mounting collar and an outer set of cutting blade ends spaced from one another; c. at least two mounting pads secured to the external or convex face of each cutting blade; d. an abrading bar with a sharp cutting peak secured to the outermost portion of each support pad, the abrading bar being constructed from composite rod material, consisting of approximately 65 per cent tungsten carbide and 35 per cent matrix rod or binder; e. a coolant distribution means in the mounting collar and neck, including a central passageway in the neck and at least a pair of branch line passangeways in the mounting collar that terminate in exit ports; and, f. cutting pressure regulating means including a spacing adjustment aperture formed through an outer end of one cutting blade with a set screw positioned in the aperture for engagement with a striking area of the other cutting blade.

Claim 10

The structure according to claim 7 wherein: the tungsten carbide consists of approximately 81 per cent tungsten, 13 per cent cobalt, 4 per cent titanium and 2 per cent tantalum, and, the matrix rod or binder consists of approximately 43 per cent copper, 40 per cent zin, 10 per cent nickel and 7 per cent silicon.