CARBIDE DIAMOND DRILL BITS

Brand	Owner	Address	Description
CJT KOOLCARB	CJT KOOLCARB, INC.	494 Mission Street Carol Stream IL 60188	carbide and diamond drill bits for power drills;CJT COOL CARBIDE;Color is not claimed as a feature of the mark.;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

A percussion drill bit for drilling a bore includes a drill body having a connecting section at a rear end thereof for connection to a percussive unit, and a plurality of cemented carbide buttons embedded in a front end of the drill body. Each button comprises a cemented carbide body having a rear mounting portion embedded in the drill body, and a front end protruding from the drill body. The front end of the cemented carbide button is substantially semi-spherically curved and defined by a radius whose origin is disposed axially rearwardly of a plane through the largest diameter of the button. The button projects from the drill bit body a distance which is not less than 50% of the button diameter. A conical intermediate surface forms, in cross-section, an acute angle of about 13-19Â° with an envelope surface of the rear mounting portion.