Patent ID: 8523494

Claim:
An expansion shell assembly for mine roof bolts, comprising: an expansion member threaded onto an associated mine roof bolt; a support device annularly disposed around the associated mine roof bolt; and an expansion shell annularly disposed around the associated mine roof bolt between the expansion member and the support device, the expansion shell having at a first end a circular base ring having a portion with no slots formed therein configured to engage the support device and fingers formed by longitudinal slots located only at a second end of said shell opposite the first end configured to engage the expansion member, wherein said support device is engaged by said shell and said expansion member is received by the shell wherein the shell is configured to expand to anchor said associated mine roof bolt in an associated bore hole wherein said support device has at least a portion of said support device configured to extend in an axial direction into said shell for tensioning said associated mine roof bolt, without cracking said shell.