YIELDING ROOF BOLTING Russian patent published in 2007 - IPC E21D21/00 

FIELD: mining, particularly to support mines.

SUBSTANCE: roof bolting comprises bolt fixed in massif and provided with outer threaded end, support member, deformable member and deforming member. The deformable member is made as head connected to bolt and having inner thread and outer projections. Deforming member is formed as spacing member freely put on head and having annular end blade. Outer projections of deformable member extend in longitudinal direction and have blind channels spaced from lower head end so that continuous support belt is formed. The support belt is adapted to bear annular end blade. Projection outline defines circle. Blind channel bottoms are extensions of upper cylindrical head part and made as guiding surfaces for annular end blade.

EFFECT: provision of necessary bolting flexibility with predetermined resistance.

1 dwg