Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Patent
1997-07-10
1998-12-08
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
411 50, 411 72, 411 77, F16B 1304, F16B 1306
Patent
active
058460411
ABSTRACT:
An expandable anchor assembly is provided for anchoring the threaded end portion of an elongated roof bolt in a borehole. The anchoring assembly includes a hollow outer sleeve in the form of a plurality of symmetrically arranged, longitudinal segmented wall portions with exterior gripping teeth and an inner expander sleeve in the form of a corresponding plurality of longitudinal wall portions symmetrically arranged about a central axis to define an inner threaded cylindrical section. The inner sleeve is captured within and moveable axially relative to the outer sleeve. As the threaded end portion of the elongated bolt is inserted into the inner threaded cylindrical section of the inner sleeve from the trailing end to the leading end thereof, the inner sleeve expands over and clamps around the threaded end portion of the elongated bolt. Thereafter, partial withdrawal of the elongated bolt from the borehole causes the inner sleeve to axially move relative to the outer sleeve from the leading end toward the trailing end of the outer sleeve in a wedging action to cause the outer sleeve to radially expand and force engagement of the gripping teeth against the sidewall of the borehole to thereby secure the expandable anchor assembly and therewith the threaded end portion of the elongated bolt within the borehole.
REFERENCES:
patent: 4602902 (1986-07-01), Herb
patent: 4861198 (1989-08-01), Stankus
patent: 5018908 (1991-05-01), Laphon
patent: 5094577 (1992-03-01), Clark et al.
patent: 5219248 (1993-06-01), Wright
Bevan John E.
King Grant W.
Dvorscak Mark P.
LaMarre Mark
Moser William R.
The United States of America as represented by the United States
Wilson Neill R.
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