Abstract: A locking system for articulated fittings of car seats with a free-swivelling backrest. In particular, a wobble fitting is used with the articulated fitting and is made up of at least one notch, with which a pawl engages in a locking position, and a first clamping surface as the contact surface for an operating and safety element. The operating and safety element can be rotated around a swivel axis so as to increase the clamping force exerted on the pawl and is spring-loaded to secure the pawl in the locking position by using a second clamping surface, which rests without self-locking against the first clamping surface of the pawl. The operating and safety element includes a catch surface such that, when the pawl rests against the first clamping surface, it prevents the pawl from exerting an opening moment on the operating and safety element.