Drive coupling for high-speed rotating brush

A drive coupling assembly for a high-speed rotating brush, comprising:

• a coupling head having a coupling head rotation axis (Lch) and including three drive surfaces which are arranged to be rotationally symmetrical through 120° with respect to said coupling head rotation axis;
• and
• a coupling member, having a coupling member rotation axis (Lcm) and including three first, helicoidal drive surfaces which are arranged to be rotationally symmetrical through 120° with respect to said coupling member rotation axis,
• characterized in that the coupling member further includes three second drive surfaces, each of which second drive surfaces is mirror symmetric to a respective first drive surface in a respective axial-radial plane of symmetry (P), and in that
• said coupling head and said coupling member are detachably couplable, such that, in a coupled condition, their rotational axes (Lch, Lcm) are aligned and the coupling head is rotatable to drive each of its drive surfaces in contact with a respective first or second drive surface of the coupling member, wherein the drive surfaces of the coupling head and the first and second drive surfaces of the coupling member are configured such that rotatably driving the former in contact with the latter results in the exertion of both a torque and an axially directed force on the coupling member, which axially directed force is independent of whether the coupling member is driven clockwise or counter-clockwise with respect to its rotation axis Lcm).