Kennametal Inc.

Kennametl Inc.

Kris Edwin Strothmann

Tod Duane Hill

Chad Swope

Douglas Edward Bise

A roof drill bit has an elongate roof drill bit body, which has a forward end and a rearward end. The roof drill bit body contains a slot at the forward end. The roof drill bit body contains a dust port wherein the dust port has a central longitudinal dust axis. The roof drill bit further has a hard insert received within the slot wherein the hard insert has a leading surface. The leading surface of the hard insert is rotationally forward of the central longitudinal dust axis of the dust port.

Roof drill bit, roof drill bit body and hard cutting insert for roof drill bit

A core breaker that includes a support that contains at least one bore wherein the bore is defined in part by an axial forward frusto-conical wall and further defined by an axial rearward cylindrical wall that contains a groove therein. The core breaker has an elongate rotatable cutting tool that has an axial forward end and an axial rearward end, as well as a head adjacent to the axial forward end and a shank adjacent to the axial rearward end wherein the shank contains a reduced diameter portion. There is a frusto-conical shoulder mediate of the head and the shank. The cutting tool further includes a resilient retainer that has at least one radial outward protrusion. When the cutting tool is retained within the bore, the protrusions of the resilient retainer are received within the groove in the bore and the frusto-conical shoulder of the cutting tool is closely adjacent to the frusto-conical wall of the bore.

Growing community of inventors

Mt. Vernon, IL, United States of America

Kris Edwin Strothmann