Abstract: A locking device for adjustably locking two mutually movable parts with respect to each other, particularly for preventing an automobile seat from sliding longitudinally along the floor of an automobile. A stationary member is secured to the floor and is provided with teeth for cooperating with a toothed member which is secured to the automobile seat. The two sets of teeth are normally urged into engagement with each other by means of a spring member. For adjustment, the second part can be displaced at right angles to the floor in such manner that the two sets of teeth are disengaged, thereby permitting the seat to slide longitudinally with respect to the floor.

Abstract: A mechanism for adjusting the inclination of the seat backs of seats primarily for motor vehicles. The mechanism comprises two brackets, one connected to the base and the other connected to the seat back of a vehicle seat. Each bracket forms an integral structure and comprises a gear ring of internal teeth, said gear rings having the same diameters, with the number of teeth of the respective gear rings differing in number by a predetermined quantity. One or more gear wheels are movable in a planetary orbit inside the brackets and mesh with the teeth of the latter. Cover plates cover the teeth of said brackets and said gear wheel or wheels and mate with a corresponding recess or a corresponding raised portion, respectively.