Handheld power tool

Patent metadata

Field	Value
Publication number	US-9970467-B2
Application number	US-201415105187-A
Country	US
Kind code	B2
Filing date	Dec 16, 2014
Priority date	Dec 19, 2013
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

An expansion anchor including a bolt and an expansion sleeve surrounding the bolt is provided, the bolt having: an expansion cone in the region of the front end of the bolt, which expansion cone radially enlarges the expansion sleeve when moved into same; a threaded section for introducing tensile forces into the bolt; a shoulder that limits a movement of the expansion sleeve away from the expansion cone; and at least one anti-rotation protrusion for inhibiting a rotation of the expansion sleeve in relation to the bolt, the protrusion originating at the shoulder and protruding radially outwards on the bolt. The axial length of the anti-rotation protrusion is smaller than the pitch of the threaded section arranged on the bolt.

First claim

What is claimed is:

1. An expansion anchor comprising:
a bolt having a front end; and
an expansion sleeve surrounding the bolt,
the bolt having an expansion cone in an area of the front end, the expansion cone expanding the expansion sleeve radially, when the expansion cone is drawn into the expansion sleeve,
the bolt having a threaded section for introducing tensile forces into the bolt, the threaded section having a pitch,
the bolt having a shoulder delimiting a displacement of the expansion sleeve away from the expansion cone, and
the bolt having at least one anti-twist protrusion for inhibiting a twisting of the expansion sleeve in relation to the bolt, the anti-twist protrusion originating from the shoulder and the anti-twist protrusion projecting radially outward on the bolt,
an axial length of the anti-twist protrusion being smaller than double the pitch.

2. The expansion anchor as recited in claim 1 wherein:
the axial length of the anti-twist protrusion is smaller than the pitch,
the axial length of the anti-twist protrusion is smaller than 0.1 times a maximum axial extension of the expansion sleeve,
the axial length of the anti-twist protrusion is smaller than a maximum thickness of the expansion sleeve, or
the axial length of the anti-twist protrusion is smaller than 0.1 times a maximum diameter of the bolt.

3. The expansion anchor as recited in claim 2 wherein the anti-twist protrusion acts against an inside of the expansion sleeve facing the bolt.

4. The expansion anchor as recited in claim 2 wherein the bolt has at least one additional anti-twist protrusion.

5. The expansion anchor as recited in claim 2 wherein the threaded section is a male threaded section.

6. The expansion anchor as recited in claim 2 further comprising a nut having a thread corresponding to the threaded section, the nut being situated on the threaded section.

7. The expansion anchor as recited in claim 2 wherein the bolt includes a neck area between the expansion cone and the shoulder, the anti-twist protrusion projecting radially outward from the neck area and projecting axially with respect to the shoulder.

Assignees

• Hilti Ag

Inventors

• Dijkhuis Arjen Detmer
• Scholz Patrick
• Meier Robert
• Rickers Peter

Classifications

• F16B13/065 Primary

  fastened by extracting the screw, nail or the like · CPC title