Ejot Gmbh and Co. Kg

Ejot Baubefestigungen Gmbh

Ejot Se & Co. Kg

Michael Achenbach

Ralf Birkelbach

Ralph J Hellmig

Stephan Weitzel

Ilir Selimi

Frank Dratschmidt

Jan Hackler

Volker Dieckmann

Juergen Behle

Rene Gerber

Eberhard Christ

Heinrich Friederich

Uwe Siegemund

René Gerber

Gottfried Dr König

Karl-Georg Keller

The invention relates to a screw (IO) in order to cut a mating thread in a plastic article, comprising a lower threaded part (F) and an upper threaded part (T), the lower threaded part having a larger diameter and its tip covering a larger surface than the upper threaded part.

Screw for screwing into plastic

A self-tapping screw () comprising a drive () and a shank () bearing a thread comprising a main thread (), wherein the main thread () has a maximum main thread external diameter (D) and a cutting area (F) and a supporting area (T) following in the direction of the drive (), wherein the shank () has a threaded end () at an end opposite the drive (), with the screw end () having a diameter (DE) of at least 20% of the maximum main thread external diameter (D), The shank further has, in the region of the screw end (), a tap flute (), wherein the tap flute () comprises at least two tapping thread turns () which attain, in their external diameter (D), no more than 90% of the maximum main thread external diameter (D) and form a tap region in which the tapping thread turns () have the same diameter development, and in addition in that the diameter of the main thread () in the tap flute region (AB) is less than or equal to the diameter (D) of the tapping thread turns ().

Self-tapping screw

A hole-forming and thread-forming screw for screwing into a sheet piece, including a slotted screw head for accommodating a tool, a threaded shank and a tapering hole-forming part having outer sides with a continuous convex-shaped curve along an entire length thereof, ribs running like threads along the hole-forming part being provided. The hole-forming part ends in a rounded, blunt end piece, and the rounded ribs, which chiplessly displace the material of the sheet part, are situated symmetrically opposite one another and have a pitch that is a multiple of the thread pitch.

Hole-forming and thread-forming screw

Growing community of inventors

Breidenbach, Germany

Michael Achenbach