Method of forming anchors
AssigneeHilti Aktiengesellschaft
InventorsSimon Kind, Simon Oppeneiger, Hideki Shimahara
Life of this patent
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Abstract
The inventive method of forming anchors comprises following steps. A rod-shaped workpiece is roll-formed by penetrating the rod-shaped workpiece with two wedge-shaped tools at two points. The two points are arranged on opposite sides and axially separated of a plane perpendicular to an axis of the rod-shaped workpiece. The two wedge-shaped tools are axially approaching to the plane while the rod-shaped workpiece is revolved around the axis. The roll-formed workpiece is separated along the plane for forming two bolts. A sleeve is applied around the anchor bolts.
Claims22
A method of forming anchors, comprising:
- roll forming a workpiece having a rod shaped body, that comprises a longitudinal axis running between a first end and a second end thereof, by penetrating the workpiece with two wedge-shaped tools at two points, wherein the two points are arranged on opposite sides of and axially separated by a plane perpendicular to the longitudinal axis of the workpiece, and wherein the two wedge-shaped tools are configured to axially approach the plane as the workpiece is revolved around the longitudinal axis to displace material and cause a diameter of the workpiece to increase in a central region between the two wedge-shaped tools as the workpiece is roll formed;
- dividing the roll-formed workpiece along the plane to form a first anchor bolt and a second anchor bolt;
- applying a first sleeve around the first anchor bolt;
- and applying a second sleeve around the second anchor bolt.
A method of forming anchors, comprising:
- roll forming a workpiece having a rod shaped body, that comprises a longitudinal axis running between a first end and a second end thereof by:
- penetrating the workpiece with two wedge-shaped tools at two points, wherein the two points are arranged on opposite sides of and axially separated by a plane perpendicular to the longitudinal axis of the workpiece, and wherein the two wedge-shaped tools are configured to axially approach the plane as the workpiece is revolved around the longitudinal axis to displace material and cause (i) a diameter of the workpiece to decrease in first and second regions and form a first tapered part and second tapered part axially separated by the plane, and (ii) the diameter of the workpiece to increase in a central region between the two wedge-shaped tools and form first and second conical leading ends that respectively slope radially outward from the first and second tapered parts as the workpiece is roll formed;
- and
- dividing the workpiece with a ridge along the plane to form a first anchor bolt comprising the first tapered part and the first conical leading end and a second anchor bolt comprising the second tapered part and the second conical leading end;
- applying a first sleeve around the first tapered part of the first anchor bolt;
- and applying a second sleeve around the second tapered part of the second anchor bolt.
Dependencies are inferred from the claim text.