SCREWING TOOL AND CORRESPONDING SCREW Russian patent published in 2020 - IPC B25B15/00 F16B23/00 

FIELD: machine building.

SUBSTANCE: screwing tool with lengthwise axis X comprises a first drive part that can receive torque and a second transmission part designed to interact with the screw. Second part has conical peripheral envelope with three longitudinal concavities with conical generatrices forming three identical radial transmitting portions, each of which has in a section perpendicular to the longitudinal direction, a distal tangential portion, which extends according to the circular arc, and is continued on both sides by two connecting sections, each of which is formed by a curve comprising a substantially radial main part, and having an inflection point before repeated connection of proximal connecting area, which provides connection with adjacent connecting section. Connection areas have cone angle which is less than angle of cone of tangential sections and makes, in fact, less than 5°, preferably, less than 3°.

EFFECT: improved tool direction and torque transfer.

15 cl, 5 dwg