Mine roof expansion anchor and bail member therefor
Patent
·
OSTI ID:6957573
A bail member is described having a medial portion of substantially conical shape for retaining shell and tapered plug portions of a mechanical expansion anchor in mutually assembled relation prior to installation. The medial portion is positioned over the large end of the plug and tapers inwardly in a direction away from the plug to provide a lead-in for insertion of the anchor, carried on the end of a mine roof bolt, into the open end of a blind drill hole. The bolt and medial portion may include an axial bore and a plurality of openings, respectively, for passage of a hardenable grout pumped through the bore to provide an anchoring system of enhance strength and durability. 6 figs.
- Assignee:
- Eastern Co., Naugatuck, CT (United States)
- Patent Number(s):
- US 5275512; A
- Application Number:
- PPN: US 7-913167
- OSTI ID:
- 6957573
- Country of Publication:
- United States
- Language:
- English
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