Vertical and angular adjustment device for vehicle seats

The vertical and angular position adjusting device for motor vehicle seats includes a pair of base frames and a pair of seat carriers, each base frame and each set carrier being linked by a support arm and by an elbow joint to form a five-bar linkage, the lower lever of the elbow joint and the support arm being provided respectively with a gear segment and the base frame portion between the two gear segments pivotably supporting a two-arm control member having each arm terminated with locking teeth cooperating with the corresponding gear segment to lock the latter in an adjusted angular position. The control member is spring-biased and guided in an oblong slot so that it is controllable by a handle out and into engagement with the gear segments.