Patent 9969072 was granted and assigned to Hilti on May, 2018 by the United States Patent and Trademark Office.
A production method provides for punching holes in a metal strip, cold-forming the metal strip to form a guide tube, and joining the lengthwise edges of the metal strip to each other by a seam or teeth so as to create a uniform material. Subsequently, a piston-like striker is inserted into the guide tube.