US 5,653,563 AGranted

Anchor

AssigneeIllinois Tool Works Inc.

InventorsRichard J. Ernst, Mark S. Timmerman

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Abstract

A construction anchor for mounting an object on a structure of masonry, concrete, wood, metal or the like includes an anchoring portion and a cap. The anchor is adapted to be inserted, anchoring portion first into a pre-drilled adhesive-filled hole. The anchoring portion has a threaded bore, which includes an unthreaded close-fit-counterbore portion outward of a threaded portion. The cap prevents dust, dirt and adhesive from entering the threaded bore, and has an upper surface with a removable central area. When the adhesive has set, holding the construction anchor within the hole, the central area is removed, and a screw or bolt is inserted through the hole left by the removal and engaged with the threaded portion of the threaded bore. The unthreaded close-fit-counterbore portion of the threaded bore provides a stretch zone for the screw or bolt.

Claims18

Dependent claims

A construction anchor for retaining an object against a structure of masonry, concrete, wood or metal said construction anchor, in use, being secured within a hole defined in said structure, said construction anchor comprising:

an anchoring portion having a first end, a second end, a longitudinal axis, a threaded bore extending partially therethrough from said first end, said threaded bore terminating proximal said first end in an unthreaded close-fit-counterbore portion outward of a threaded portion, said unthreaded close-fit-counterbore portion having a uniform diameter extending to said first end providing a stretch zone for a bolt engaged in said threaded portion, and at least one first annular groove around said second end, thereby providing at least one lobe at said second end of said anchoring portion, said lobe having a surface oriented obliquely with respect to said longitudinal axis, said threaded bore terminating within said anchoring portion short of said at least one first annular groove;
and
a cap fixedly attached to said first end to cover said threaded bore.

Dependencies are inferred from the claim text.