Ejot Gmbh and Co. Kg

Ejot Se & Co. Kg

Ralph J Hellmig

Ilir Selimi

Ralf Birkelbach

Wilfried Pinzl

Stephan Weitzel

Michael Achenbach

Frank Dratschmidt

Jan Hackler

Volker Dieckmann

Juergen Behle

Rene Gerber

Gerd Weigel

David Korn

René Gerber

The invention relates to a spring head screw assembly () incorporating a spring head screw () having a head () with a conical skirt () that widens towards the free end of a threaded shank which adjoins the head (), wherein the spring head screw assembly () has a washer () which is located between the skirt and the threaded part () of the shank () in an unthreaded part () of the shank that has a bolt diameter (d). The inner surface () of the skirt transitions into the shank at a radius (R), wherein the inner surface () forms a contact angle (α) with a support plane (E). The support plane is defined by the end of the skirt facing the free end of the screw and is orthogonal to the screw axis. The shank has, between the support plane and the radius in the transition to the skirt, a cylindrical region having the bolt diameter.

Spring head screw assembly

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 securing element includes a threaded region, wherein a securing rotational direction and an axial clamping direction are defined by the thread design. The securing element has a head with a head lower face which faces the clamping direction and via which a force-fitting connection with a component can be produced. The head is designed such that the head lower face has an edge region at a radial distance from the head center, and the contour of the head lower face runs opposite the clamping direction in the direction of the head center starting from the edge region, whereby a spring effect can be produced. The edge region has a changing circumferential level in the axial direction. Opposite the securing rotational direction, the circumferential level rises at a rising angle of maximally 15&#xb0; in the clamping direction over a central angle of at least 65&#xb0;.

Securing element

The invention relates to a screw having a screw head (), a screw shank () and a corrugated conical flange () which decreases in thickness toward the outside, which flange () will abut on a component part as the screw is being screwed into the latter. The two lateral surfaces () of the flange () from the screw shank () to the outer edge () of the flange taper continuously toward the outside with the thickness of the flange () decreasing at the same time, with its corrugation () extending substantially over the entire radial width of the flange ().

Screw having a screw head, a screw shank and a corrugated conical flange

Growing community of inventors

Bad Laasphe, Germany

Ralph J Hellmig