SCREW FOR SCREWING IN PLASTIC Russian patent published in 2023 - IPC F16B39/30 

FIELD: fasteners.

SUBSTANCE: claimed group of inventions relates to screws for screwing in plastic and their connection. Screw (10) for cutting of mated thread in a plastic product contains lower part (F) of thread and upper part (T) of thread, while the lower part of thread has a greater diameter, and its top has a greater surface than that of the upper part of thread. In particular, area (26) of a forming profile, which is limited with contour (24) of the forming profile, when measured in the area of 10% radius (RF) of a forming part of the maximum orthogonal distance of contour (24) of the forming profile radially inward to the central axis of the screw, is more than area (28) of a bearing profile, which is limited with contour (22) of the bearing profile, when measured in the area of 10% radius (RF) of the forming part of the maximum orthogonal distance of contour (22) of the bearing profile radially inward to the central axis of the screw.

EFFECT: provision of a screw, which, with a low moment of screwing, can create a small mechanical load of a part, while providing high extraction forces.

27 cl, 15 dwg