Chemical anchor bolt and cap assembly

Details Chemical anchor bolt and cap assembly Chemical anchor bolt and cap assembly

1996-10-07

1998-09-15

Kent, Christopher

Static structures (e.g., buildings)

Assembled in situ-type anchor or tie

Socket type

52705, 4052595, E04B 138

Patent

active

058062750

ABSTRACT:
A chemical anchor bolt and cap assembly installable in a hole drilled in masonry to tightly fasten a fixture thereto and to resist loosening of the fastening should the masonry be subjected to vibratory or other external forces. The assembly includes a bolt having an externally-threaded cylindrical shank coated with a release agent and a thin-walled hollow cap having a non-cylindrical shape coupled to the end of the shank and extending therefrom in axial alignment with the shank. To install the assembly, the shank and the cap coupled thereto are inserted through a mounting hole in the fixture into the masonry hole in which is deposited an uncured epoxy that then surrounds the cap and the shank. When the epoxy hardens, formed therein is a female thread matching the release-coated male thread of the shank so that the bolt is now turnable, the cap being then embedded in the epoxy. As a consequence, formed in the masonry hole below the end of the shank is a hard epoxy column having a non-cylindrical cavity whose epoxy bank is defined and lined by the non-cylindrical cap to create a partial barrier to the unimpeded advance of the shank. To tighten the fastening, the bolt is turned to advance the end of the shank into the cavity, the shank then overcoming the partial barrier by cutting into and tapping the lined epoxy bank. The resultant frictional engagement between the end of the shank and the partial barrier acts to resist loosening of the fastening.

REFERENCES:
patent: 3418781 (1968-12-01), Penote
patent: 4055929 (1977-11-01), Stancati et al.
patent: 4149350 (1979-04-01), Fischer et al.
patent: 4642964 (1987-02-01), Kellison
patent: 4840524 (1989-06-01), Bisping et al.
patent: 5490365 (1996-02-01), Roth

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