Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Patent
1996-07-15
1997-11-11
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
411 60, F16B 1306
Patent
active
056856784
ABSTRACT:
A fail-safe anchor bolt assembly installable in a pre-drilled hole in masonry to fasten a fixture or other object thereto, the assembly remaining securely anchored even should the hole later be enlarged as a result of a crack developed in the masonry. The assembly includes a bolt having a head engageable by a torque tool to turn the bolt and a shank extending from the head loosely encircled by an expansible shell whose normal outer diameter is close to that of the drilled hole. Threadably received on the end of the shank adjacent the shell is a wedge nut having a generally conical frustrum shape defining a leading end followed by a leading portion which merges with a compressible trailing portion terminating in a trailing end, the leading portion having a maximum diameter close to the diameter of the drilled hole and the compressible trailing portion having a normal maximum diameter greater than the diameter of the drilled hole. When the assembly is installed in a drilled hole, the leading portion of the nut enters into and acts to expand the shell against the wall of the hole to provide an anchoring force. But should a crack later develop in the masonry resulting in an enlargement of the drilled hole, the trailing portion then enters the shell to further expand it to maintain the anchoring force.
REFERENCES:
patent: 4195547 (1980-04-01), Giannuzzi
patent: 4537541 (1985-08-01), Giannuzzi
patent: 4720224 (1988-01-01), Peterken
patent: 4854793 (1989-08-01), Olivier et al.
patent: 5087160 (1992-02-01), Pezzutto
patent: 5219248 (1993-06-01), Wright
patent: 5344268 (1994-09-01), Fischer
Giannuzzi Anthony C.
Giannuzzi Louis N.
Ebert Michael
Wilson Neill R.
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