Concrete anchor
AssigneeIllinois Tool Works Inc.
InventorSigismund D. Paul
Life of this patent
Estimating the term…
Abstract
An expansion anchor comprises a stud having threads including a root, a land, and a taper extending between the root and the land and a helical member having a leading edge threadingly engageable with the threads, wherein the helical member is movable between an unexpanded position and an expanded position, wherein in the expanded position the leading edge is forced radially outwardly by the land. In one embodiment, the helical member includes a finger extending in a leading direction. A method also is disclosed for anchoring the inventive stud within a hole in a substrate by expanding the helical member until the leading edge is wedged between the land and a wall of the hole.
Claims14
An expansion anchor comprising:
- a stud having threads including a root, a land, and a taper extending between said root and said land;
- and
- a helical member threadingly engageable with said threads, said helical member having a leading edge;
- wherein said helical member is movable between an unexpanded position and an expanded position, wherein in the expanded position said leading edge is forced radially outwardly by said land.
An expansion anchor comprising:
- a helical member and a stud having threads;
- said helical member being threadingly engageable with said threads and having a finger extending in a leading direction;
- wherein said helical member is movable between an unexpanded position and an expanded position.
A method for anchoring a stud within a substrate, comprising the steps of:
- providing a stud having a leading end with threads having a root, a land, and a taper extending between said root and said land;
- providing a helical member having a leading edge;
- threadingly engaging said helical member with said threads;
- inserting said leading end of said stud into a hole in a substrate, said hole having a wall;
- withdrawing said stud from said hole so that said stud moves a predetermined distance relative to said helical member;
- and
- expanding said helical member until said leading edge is wedged between said land and said wall.
Dependencies are inferred from the claim text.