SELF-DRILLING ANCHOR BOLT AND ANCHOR DEVICE FOR IT Russian patent published in 2012 - IPC E21D21/00 E21B10/42 E21B17/42 

FIELD: mining.

SUBSTANCE: self-drilling anchor bolt contains first and second ends, shaft provided with axis and located between the ends and anchor device being arranged along the first part of shaft close to the first end and provided with female thread interacting with male thread of shaft. At that the first end of anchor bolt is provided with drill bit and limit stop to restrict rotation of anchor device on shaft to support anchor device in free threaded connection on shaft during drilling. Limit stop contains connected support surfaces, one of them is located on drill bit, the other is on shaft, at that each support surface is formed by at least one upward-projecting wall.

EFFECT: improving anchor operating reliability.

16 cl, 17 dwg