Rock bolt expansion anchor having widened expansion range

Details Rock bolt expansion anchor having widened expansion range Rock bolt expansion anchor having widened expansion range

F - Mech Eng,Light,Heat,Weapons

16

B

85/27

F16B 35/00 (2006.01) E21D 21/00 (2006.01)

Patent

CA 1178461

APPLICATION OF: CARL A. CLARK FOR: ROCK BOLT EXPANSION ANCHOR HAVING WIDENED EXPANSION RANGE ABSTRACT OF THE DISCLOSURE An expansion anchor including an expansible shell and tapered nut for insertion into a drill hole in a rock formation and adapted for outward expansion of the shell into gripping engagement with the drill hole wall to support a rock bolt and bearing plate engaging the rock formation surface around the hole. The invention resides in a novel arrangement of dimensional and structural relationships of the expansion shell and tapered nut which allow the same anchor to be used in drill holes over a range of diameters approximately three times that of con- ventional prior art anchors of the same general type.

395843

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