Turret with retractable seat

The turret (1) has a seat (6) connected to a basket (5) through a mechanical device (9) that permits the seat to be moved between a service position (10) and a retracted position. The seat is situated and immobilized inside the basket when in the service position, and is situated outside the basket when in the retracted position. The device has a rotation axle (12) permitting to rotate the seat between the positions.