Shaver head for an electric shaver

A shaver head for an electric shaver, the shaver head comprising:

• a base portion for connection of the shaver head to a main housing of the electric shaver;
• a supporting portion mounted to the base portion;
• a linear guiding structure for enabling the supporting portion to linearly move in a movement direction relative to the base portion between a retracted first position and an extended second position;
• a spring member for biasing the supporting portion away from the base portion in the movement direction from the first position to the second position;
• at least two hair-cutting units supported by the supporting portion, wherein each hair-cutting unit comprises an external cutting member with hair-entry openings and an internal cutting member with a plurality of cutting elements rotatable relative to the external cutting member;
• a respective drive spindle for each hair-cutting unit;
• and
• a locking mechanism for selectively setting the supporting portion in a locked condition or an unlocked condition, wherein the supporting portion is locked in position in the movement direction relative to the base portion in the locked condition, and wherein the supporting portion is enabled to move in the movement direction relative to the base portion in the unlocked condition,
• wherein the locking mechanism comprises a shaft extending parallel to the movement direction and a collar arranged around the shaft for interaction with the shaft,
• wherein one of the shaft and the collar is mounted, in the movement direction, in a fixed position relative to the supporting portion and the other of the shaft and the collar is mounted, in the movement direction, in a fixed position relative to the base portion, and
• wherein the shaft and the collar are rotatable relative to each other about an axis of rotation extending parallel to the movement direction, to set the locked condition or the unlocked condition of the supporting portion.