	US 11,754,110 B2
	Self-tapping screw
Michael Achenbach, Breidenbach (DE); Juergen Behle, Bad Laasphe (DE); Ralf Birkelbach, Bad Laasphe (DE); Volker Dieckmann, Bad Berleburg (DE); Frank Dratschmidt, Bad Berleburg (DE); Jan Hackler, Bad Berleburg (DE); Rene Gerber, Fronhausen (DE); Ralph J. Hellmig, Bad Laasphe (DE); Ilir Selimi, Biedenkopf (DE); and Stephan Weitzel, Bad Laasphe (DE)
Assigned to EJOT GMBH & CO. KG, Bad Berleburg (DE)
Appl. No. 17/251,793
Filed by EJOT GMBH & CO. KG, Bad Berleburg (DE)
PCT Filed Jun. 21, 2019, PCT No. PCT/EP2019/066533 § 371(c)(1), (2) Date Dec. 12, 2020, PCT Pub. No. WO2019/243608, PCT Pub. Date Dec. 26, 2019.
Claims priority of application No. 10 2018 114 983.2 (DE), filed on Jun. 21, 2018.
Prior Publication US 2021/0115959 A1, Apr. 22, 2021
Int. Cl. F16B 25/10 (2006.01); F16B 25/00 (2006.01)

CPC F16B 25/0047 (2013.01)

15 Claims

1. Self-tapping screw (10, 30), comprising:

a drive (12),

a shank (14) bearing a thread comprising a main thread (16, 32),

said main thread (16, 32) has a maximum main thread outer diameter (D_AF), cutting area (F) and a bearing area (T) following in the direction of said drive (12),

said shank (14) has a screw end (18) at an end thereof opposite said drive (12),

said screw end (18) has a diameter (D_E) of at least 20% of said maximum main thread outer diameter (D_AF),

said shank has, in the region of said screw end (18), a tap flute (20),

said tap flute (20) comprising at least two tapping thread turns (20a, 20b, 20c) which attain, in their outer diameter (D_AA), no more than 90% of said maximum main thread outer diameter (D_AF) and form a tap region,

in said tap region said tapping thread turns (20a, 20b, 20c) have the same diameter,

said diameter of said main thread (16, 32) in said tap flute region (AB) is less than or equal to said diameter (D_AA) of said tapping thread turns (20a, 20b, 20c),

said tap flute (20) has an obtuse flank angle in said tap flute region (AB),

said main thread (16) has an obtuse flank angle outside said tap flute region (AB), and,

said tap flute (20) has a flank angle in said tap region (AB) which is more obtuse than said flank angle of said main thread outside said tap flute region (AB).