# US 4,393,948 A · Rock boring bit with novel teeth and geometry

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- Number: US 4,393,948 A
- Document ID: US4393948A
- Status: Granted
- Kind: A
- Application number: 06/249,814
- Filed: 1981-04-01
- Granted: 1983-07-19
- Earliest claimed: 1981-04-01
- Assignees: Boniard I. Brown
- Inventors: Carlos Fernandez
- Web page: https://patentgrep.com/patent/US4393948A

## CPC

- E21B 10/52: with chisel- or button-type inserts
- E21B 10/16: characterised by tooth form or arrangement
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A rock boring bit assembly which includes a body configured for engagement with associated driving mechanism. At least one roller cutter is rotatably mounted on the body. The roller cutter includes a plurality of cutting member disposed about the entire face or surface thereof in generally upstanding relationship. The cutting members are arrayed over the roller cutter surface with no channel between adjacent arrays of cutting members. The cutters have generally rectilinear edges and each of the edges is disposed in substantially oblique relationship to a plurality of other rectilinear edges of other cutting members disposed proximate thereto.

## Claims

### Claim 1

A rock boring bit assembly comprising:
a body adapted for engagement with associated driving components;
at least one cone rotatively mounted on said body, said cone having an axis;
each cone including a plurality of cutting members disposed over substantially all the conical face thereof in generally upstanding relationship to the face, said cutting members having generally rectilinear edges; and
at least some of said cutting members being disposed in a plurality of rings, all of said rings extending around said axis, each of said plurality of rings being axially spaced along said axis and overlapping with at least one other ring and having the cutting members of the respective rings interspersed.

### Claim 2 (depends on 1)

The apparatus according to claim 1, wherein:
said cutting member edges are disposed in oblique relationship to the axis of the cone.

### Claim 3 (depends on 1)

The apparatus as described in claim 1, wherein: said cutting members included in any one cone are welded to that cone.

### Claim 4 (depends on 2)

The apparatus as described in claim 2, wherein: said cutting members included in any one cone are welded to that cone.

### Claim 5 (depends on 1, 2)

The apparatus according to claim 1 or 2, wherein: each of said cutting member edges within any one ring is disposed in oblique relationship to the rectilinear edges of at least a plurality of other cutting members proximate thereto.

### Claim 6 (depends on 2)

The apparatus according to claim 2, and further including:
a first ring of cutting members disposed at the axial extremity of at least one cone and most remote from the apex of that cone, each cutting member in said first ring having its geometric axis in substantially normal relationship to the axis of the cone.

### Claim 7 (depends on 5)

The apparatus according to claim 5, wherein:
the cutting member edges within at least some rings of said plurality of rings alternate in directions of inclination relative to the cone axis.

### Claim 8 (depends on 2)

The apparatus according to claim 2, wherein:
each of said cones is mounted on a bearing pin; and
the apparatus includes bearing means between said cone and said bearing pin, including a plurality of bearings.

### Claim 9 (depends on 1)

The apparatus according to claim 1, wherein:
each of said cones is mounted on a bearing pin; and
the apparatus includes bearing means between said cone and said bearing pin, including a plurality of bearings.

### Claim 10 (depends on 5)

The apparatus according to claim 5, and further including:
a first ring of cutting members disposed at the axial extremity of at least one cone and most remote from the apex of that cone, each cutting member in said first ring having its geometric axis in substantially normal relationship to the axis of the cone.

### Claim 11 (depends on 6)

The apparatus according to claim 6, wherein:
each of said cones further includes a second ring of elongated cutting members disposed with the axis of each at an angle which is intermediate a normal to the axis of the ring of cutting members which are most remote from the apex and a normal to the surface of the cone of the cutting inserts disposed elsewhere on this cone, said second ring being disposed axially intermediate said ring of inserts which is most remote from said apex and the cutting inserts disposed elsewhere on said cone.

### Claim 12 (depends on 10)

The apparatus according to claim 10, wherein:
each of said cones further includes a second ring of elongated cutting members disposed with the axis of each at an angle which is intermediate a normal to the axis of the ring of cutting members which are most remote from the apex and a normal to the surface of the cone of the cutting inserts disposed elsewhere on this cone, said second ring being disposed axially intermediate said ring of inserts which is most remote from said apex and the cutting inserts disposed elsewhere on said cone.