Base for securing child seats in cars

This invention is a base for attaching seats and carrycots forming seat and backrest, using preferably "isofix" type anchoring points and which can hold the seat or carrycot parallel to the car seat back in either direction or perpendicular to the car seat back in which the carrycot is used as a seat. A horizontally rotating frame is fitted to the base, onto which the seat or carrycot is secured and there are means to lock it in its different rotating positions. A characteristic is that the frame has a round ring-shaped plate with grooves in its inner periphery that fit into a wedge on the base that can move round, this wedge is activated by a cam mechanism governed from either of the two opposite controls on the base.