Locking device for a cover assembly

A cap assembly comprising a main wall and a cover, adapted to cooperate with each other, the cap assembly comprising a locking device configured to lock the cover in position on the main wall, the locking device comprising at least:

• - an actuator on the main wall and comprising at least one actuating rib and at least one elastically deformable member translationally linked to each other,
• the actuating rib extending through a through-aperture formed in the main wall, and
• the actuator being movable in translation with respect to the main wall so that the actuating rib moves through the aperture between a closed position of the locking device wherein the elastically deformable member is in a decompressed state, and an open position of the locking device wherein the elastically deformable member is in a compressed state,
• - a locking member projecting from the cover and configured at least to lock said cover in position with respect to the main wall when the actuating rib of the actuator is in the closed position of the locking device.