Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Patent
1987-04-14
1988-06-28
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
411 72, 405259, F16B 1306
Patent
active
047535598
ABSTRACT:
An expansion shell is formed from a single piece of sheet metal consisting of two spade-shaped leaves connected by a narrow portion which becomes the bail. The leaves are corrugated along their transverse axes so as to form a series of undulations of increasing amplitude and the leaves are formed into semi-cylinders. The corrugated semi-cylindrical leaves are centrally slotted along their longitudinal axes so as to form four leaf segments. The corrugated leaf segments are then compressed along their longitudinal axes so as to cause the undulations to form a tapered pleated metal fold, wherein the crests of the undulations become semi-cylindrical ridges capable of gripping the rock formation.
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Brochure received from the Technology Information Division, Canada Centre for Mineral and Energy Technology, Department of Energy, Mines and Resources, Ottawa, Canada; 1980.
Beerbower, W. B., "Resin Rock Bolting in Coal"; Cox, R. M., A Comparative Evaluation of Rock Bolt Anchors; Scott, J. J.; Friction Rock Stabilizers-A New Rock _Method; all being pre-print proceedings of the 17th U.S. Symposium _on Rock Mechanics held at Snowbird, Utah, Aug. 25-27, 1976; pp. 5E3-1 to 5E3-3, pp. 5E4-1 to 5E4-5, pp. 5E5-1 to 5E5-8, respectively.
Seneca (St. Catherines) Manufacturing Ltd.
Wilson Neill R.
LandOfFree
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