Robert B Benedict

US Patent:

20180216409, Aug 2, 2018

Filed:

Mar 26, 2018

Appl. No.:

15/935723

Inventors:

- Franklin Park IL, US
Robert J Benedict - Inverness IL, US
Michael J Malget - Sleepy Hollow IL, US

Assignee:

Ajax Tool Works, Inc. - Franklin Park IL

International Classification:

E21B 10/26
E21B 10/40

Abstract:

A piloted rock drill bit includes an integral body having a pilot drill section, a reaming section and a mounting base section extending along a longitudinal axis. The reaming section includes four wings extending from the longitudinal axis in an “X” pattern. A cutting carbide member is secured to each wing. Waste debris ejection slots extend radially into the reaming section between the wings. The pilot drill section includes a post and a leading carbide member. The leading carbide member includes a pair of sloped surfaces extending forwardly towards each other and intersecting at a leading cutting edge. The leading cutting edge and sloped surfaces extend along a crescent shaped arc. Forward air delivery bores extend through the body to forward discharge openings at the pilot drill section. Rear air delivery bores extend through the body to rear discharge opening at the waste debris ejection slots.

US Patent:

20170335632, Nov 23, 2017

Filed:

May 17, 2016

Appl. No.:

15/156447

Inventors:

- Franklin Park IL, US
Robert J. Benedict - Inverness IL, US
Michael J. Malget - Sleepy Hollow IL, US

Assignee:

Ajax Tool Works, Inc. - Franklin Park IL

International Classification:

E21B 10/40
E21B 10/43
E21B 10/26

Abstract:

A piloted rock drill bit includes an integral body having a pilot drill section, a reaming section and a mounting base section extending along a longitudinal axis. The reaming section includes four wings extending from the longitudinal axis in an “X” pattern. A cutting carbide member is secured to each wing. Waste debris ejection slots extend radially into the reaming section between the wings. The pilot drill section includes a post. A leading carbide member is secured to the post. The leading carbide member includes a pair of sloped surfaces extending forwardly towards each other and intersecting at a leading cutting edge which extends perpendicular to the longitudinal axis. The leading cutting edge and sloped surfaces extend along a crescent shaped arc. An air delivery bore extends through the body to discharge openings located between the leading cutting edge and wings which extend radially perpendicular to the leading cutting edge.