Releasable barrier coating for chemical anchor bolt

Details Releasable barrier coating for chemical anchor bolt Releasable barrier coating for chemical anchor bolt

1998-03-30

1999-04-20

Wilson, Neill

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Including settable material

Adhesive encapsulated

411258, 411428, 411903, 411930, F16B 3900, F16B 3902

Patent

active

058951865

ABSTRACT:
A chemical anchor bolt and cap assembly installable in a hole drilled in masonry for fastening an object thereto The threaded shank of the bolt and the hollow cap extending from its end are inserted into the hole, causing an uncured bonding agent deposited in the hole, such as an epoxy, to surround the cap and the shank. When the epoxy hardens the cap is then embedded in the epoxy to create a void below the end of the shank. Cast in the epoxy surrounding the shank is a female thread that complements the shank thread. To permit the bolt to turn and cause the end of the shank to advance into the void and thereby tighten the fastening, the threaded shank has coated thereon a releasable barrier layer that acts to masks surface irregularities in the shank thread and to slightly space the shank thread from the female thread. As a consequence, the female thread cast in the epoxy is functionally free of irregularities and is loosely intermeshed with the shank thread whereby the bolt can then be easily turned.

REFERENCES:
patent: 5221170 (1993-06-01), Duffy et al.
patent: 5490365 (1996-02-01), Roth
patent: 5568711 (1996-10-01), Popp et al.

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