Anchor bolt and production method
AssigneeHilti Aktiengesellschaft
InventorsHideki Shimahara, Mark Winkler, Matthias Wissling
Life of this patent
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Abstract
An anchor bolt for an expansion anchor, and a method of producing the anchor bolt, is disclosed. The anchor bolt has an expansion body which is arranged coaxially with respect to an axis, where a circumferential surface of the expansion body has ribs and grooves in an alternating manner in a circumferential direction. Top surfaces of the ribs diverge from the axis in a direction along the axis. Bottom surfaces of the grooves converge in the direction of the axis.
Claims15
An anchor bolt for an expansion anchor, comprising:
- a shaft;
- a neck;
- and
- a conical expansion body arranged coaxially with respect to an axis, wherein a circumferential surface of the expansion body has alternating ribs and grooves in a circumferential direction, wherein respective top surfaces of the ribs diverge from the axis in a direction along the axis, and wherein respective bottom surfaces of the grooves converge toward the axis in the direction along the axis;
- and
- wherein the circumferential surface of the expansion body is inscribed in a first envelope curve that is convex in the circumferential direction and expands radially along the direction along the axis, wherein a second envelope curve that is convex in the circumferential direction and decreases radially along the direction is inscribed in the circumferential surface, and wherein the circumferential surface in the circumferential direction alternatingly touches the first envelope curve with the top surfaces and the second envelope curve with the bottom surfaces.
The anchor bolt according to 2, wherein a content of a cross-sectional surface of the expansion body is the same in each of the sectional planes.
A method of producing an anchor bolt of an expansion anchor, comprising the steps of:
- rolling out a cylindrical blank on a surface with an applied rolling profile for a structured, conical expansion body, which along a rolling direction has alternating elevations and depressions, wherein, in a first sectional plane perpendicular to an axis of the blank, the elevations are raised with respect to the depressions by a first rise that is perpendicular to the surface and, in a second sectional plane that is parallel to the first sectional plane and is displaced in a direction parallel to the axis, the elevations are raised with respect to the depressions by a second rise that is perpendicular to the surface, wherein the first rise is less than the second rise.
Dependencies are inferred from the claim text.