Shaving apparatus with detachable cutting unit

A shaving apparatus provided with at least one cutting unit having external cutting member and an internal cutting member, the shaving apparatus comprising:

• a drive mechanism for driving the internal cutting member into rotation;
• and
• a coupling for transferring a driving force from the drive mechanism to the internal cutting member, said coupling comprising a first coupling member having a coupling head and a second coupling member having a coupling cavity for receiving said coupling head to transfer said driving force inducing a driving torque about an axis of rotation of the internal cutting member,
• wherein said coupling head is detachably inserted into said coupling cavity and is detachable from said coupling cavity by a movement of said coupling head in relation to said coupling cavity in an axial direction parallel to the axis of rotation,
• wherein said coupling cavity has a plurality of driven surfaces, arranged to receive the driving force to induce the driving torque about the axis of rotation,
• wherein said coupling member has recesses, each recess of said recesses extending in a radial direction relative to the axis of rotation from said coupling cavity and being delimited by two side wall sections which each extends with a radial direction component with respect to the axis of rotation, wherein each of said two side wall sections of the each recess of said recesses forms an edge with a bottom surface of said coupling member, and
• wherein said edges of the each recess converge on each other in a radially outward direction in relation to said axis of rotation.

An internal cutting member for a shaving apparatus, the internal cutting member having an axis of rotation and comprising:

• a carrier;
• cutter elements located at a circumference of the carrier;
• and
• a coupling member having a coupling cavity configured to detachably receive a coupling head of the shaving apparatus inside the coupling cavity,
• wherein the coupling member has recesses, each recess of the recesses being delimited by two side wall sections and extending in a radial direction relative to the axis of rotation, and
• wherein the two side wall sections that delimit the each recess are non-parallel to each other.