Patent Number: 6,309,159

Title: Self drilling roof bolt

Abstract: An elongate roof bolt includes a bolt body having an axially extendingcentral bore and defining a leading end. The leading end includes a pairof axially extending abutment elements formed by machining. Each abutmentelement includes an abutment face for engagement with a drill tip onopposite sides thereof, to transmit rotary forces during drilling. Thedrill tip extends across the leading end of the bolt body and is bonded tothe abutment elements by welding, soldering or brazing. The bore opens outof said bolt bonded adjacent said leading end.

Inventors: Weaver; Steven Lee (Maryland, AU), McLean; Michael Andrew (Hamilton East, AU), Johnson; Eric Ivan (Warners Bay, AU)


International Classification:

Expiration Date: 10/32013