TRANSMISSION OF THE ROTATING MOMENT Russian patent published in 2017 - IPC B25B15/02 B25B17/00 B25B13/06 F16B23/00 

FIELD: machine engineering.

SUBSTANCE: screwdriver for torque transmission, configured to enter the slot of the head of the fastener, with a larger diameter of the slot of the head of the fastener is less than 0.06 or less 0.1 inches, comprises a main body, the first end part of which is configured to receive torque from the torque transmission source and with the possibility of transmitting the torque of the second end portion. The second end portion of the housing opposite the first end portion is formed as a key parallel to the screwdriver axis and having a protruding driving end. The key is formed by a shape enabling it to enter the slot of the head of the fastener and has a larger diameter of less than 0.06 in, and a smaller diameter, the projecting leading end having beveled portions with an angle of 10° up to 30° with respect to a plane perpendicular to the axis of the screwdriver, and is formed in a shape different from the shape of the key, and at least a part of the beginning of its leading end has a size of a larger diameter of the key. The protruding leading end of the second end portion of the main body has a shape consistent with the spline of the head of the fastener for transferring the torque from the second end portion of the main body to the fastener.

EFFECT: improved torque transmission.

14 cl, 1 tbl, 8 dwg