Seat with mechanical synchronisation of the backrest and legrest

The seat has a backrest structure (3) and a squab structure (2) mounted to pivot with respect to the backrest. The backrest structure is connected to the support structure (5) by a pivot connection (10) and a leg rest (4) is connected by a pivot connection (6) to the front end of the squab structure. The squab structure has a mechanical synchronisation unit to synchronise the movements of the backrest and the leg rest.