F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/27
F16B 13/06 (2006.01) E21D 21/00 (2006.01)
Patent
CA 1039986
ABSTRACT An expansible shell formed of a deformable material and rock bolt assembly incorporating said shell is described. The shell comprises a one-piece casting formed of zinc, zinc alloy, aluminum, iron or plastics by die or gravity casting or by injection moulding. Each shell consists of a plurality of outwardly diverging leaves each with a transversely convex curved outer rock engaging face for defining a substantially cylindrical external surface when the shell is compressed to its operative shape. A planar face is formed on the inner side of each leaf inclined at a small angle of about 8° to the longitudinal centerline of the outer convex face whereby the leaf has a thin inner end and a thick outer end. The shell inner ends each have a thin, resilient arm formed as an inner extension which interconnect to form a central bail-like structure. In a preferred embodiment, the shell is adapted to fit over and engage a nut having a plurality of tapered planar faces corresponding with the planar inner faces of the leaves for expanding the leaves radially upon longitudinal axial movement of the nut relative to the shell. The shell and rock bolt assembly of the invention provide a simple structural combination wherein the shells can be nested for storage and shipment, easily adapted for use, and the rock bolt assembly readily installed to provide improved surface area contact with a drill hole wall and improved resistance to sleeve slippage.
255302
Haslam Donald B.
Reynolds John W.
LandOfFree
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