| 摘要 |
An expandable mine bolt assembly having a shell and wedge unit threaded upon the shank of an elongated bolt. The shell contains at least one or more leaf sections. The arms of a U-shaped metal strap are joined to the shell and the strap is arranged to pass over the wedge and the distal end of the bolt. At least one arm of the strap is provided with a wrapped section containing folded legs. The distal end of the bolt applies pressure against the strap as the bolt is threaded through the wedge which, in turn, causes the legs of the wrapped section to unfold into holding contact against the wall of a receiving hole thereby preventing the assembly from spinning in the hole as the shell is being expanded by the wedge.
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