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.
Claims10
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, and said helical member includes a body and a finger thinner than said body, said finger having said leading edge, and
- wherein a root contacting surface of said body has an axial length of less than a corresponding axial length of said root, and said finger having an axial length of less than an axial length of said taper, and an angle with respect to said land substantially complementary with an angle of said taper with respect to said land.
An expansion anchor comprising:
- a helical member and a stud having threads including a root, a land, and a taper extending between said root and said land;
- and
- 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, and said helical member includes a body and a finger thinner than said body, said finger having said leading edge, and
- wherein a root contacting surface of said body has an axial length of less than a corresponding axial length of said root, and said finger having an axial length of less than an axial length of said taper, and an angle with respect to said land substantially complementary with an angle of said taper with respect to said land.
Dependencies are inferred from the claim text.