Patent ID: 11879491
Assignee: DISSING A/S
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A screw (1) comprising a screw-head (2) at a first end (1a) of the screw (1) and a shank (3) extending from the screw-head (2) towards an opposite, second end (1b) of the screw (1) where a thread (5) is provided on the shank (3) for screwing the screw (1) into a material by a fastening-tool; wherein the screw (1) has a longitudinal central axis (6) extending between the first end (1a) and the second end (1b); wherein the screw-head (2) has an upper side (2a) and an underside (2b), wherein the upper side (2a) comprises a tool-receiver (4) for engagement with the fastening-tool; wherein the underside (2b) of the screw-head (2) comprises a tapered surface (7) with a taper-direction (19) towards the shank (3), the taper-direction (19) being in a plane that contains the central axis (6); the tapered surface (7) being provided with a plurality of milling-ribs (8), each milling-rib (8) comprising a front-side (15) that is oriented towards a milling direction and delimited by a milling-edge (17) for milling material during countersinking of the screw-head (2), and each milling-rib (8) comprising a back-side opposite to the front-side; wherein the front-side (15) is inclined relatively to the taper-direction (19), wherein the inclination of the front-side (15) and the milling-edge (17) are oriented for inward-pressing of milled material towards the shank (3) during countersinking of the screw-head (2) in the material; wherein smoothly bending cavities (14) are provided between the milling-ribs (8), the cavities (14) extending into the underside (2b) of the screw-head (2), wherein each of the cavities (14) is smoothly concavely curved from one milling-rib (8) to a neighboring milling-rib (8);
wherein the front-side (15) of the milling rib (8) is straight planar.