Adjusting armature for the back rests of vehicle seats, in particular, motor vehicle seats

An adjusting armature for a back rest of a motor vehicle seat, wherein the back rest, which is adjustable about a first axis of rotation in an inclined position and lockable in the inclined position by an adjusting device, is configured to fold forwardly and backwardly relative to a seat part of the motor vehicle seat about a second external axis of rotation, positioned at a distance from the first axis of rotation, and is configured to be secured in a folded-back position;

• the adjusting armature comprising:
• a rotary bracket configured to be connected to the back rest so as to pivot with the back rest;
• a locking bolt receptacle stationarily arranged on the seat part and having a planar support surface;
• a locking bolt axially moveably arranged on the rotary bracket and spring-loaded in a locking direction for engaging releasably the locking bolt receptacle;
• a stop bolt stationarily arranged on the seat part;
• a stop receptacle provided on the rotary bracket configured to interact with the stop bolt;
• wherein the locking bolt has a guide section and a locking section having a radially changing support curve;
• wherein the guide section of the locking bolt is configured to undergo a rotational movement in addition to being axially guided;
• wherein the rotational movement causes the radially changing support curve of the locking section to be supported on the planar support surface of the locking bolt receptacle so as to eliminate play.