US Patent 7140682 Adjusting device for a vehicle seat

A vehicle seating system for adjusting, without rails, the vertical and longitudinal position and the inclination of a vehicle seat relative to a vehicle floor has, in one embodiment, first and second pivot levers, spaced apart from one another in an adjustment direction. The pivot levers are articulated respectively on the vehicle seat and on the vehicle floor by way of pivot pins extending parallel to one another. The pivot pins arranged on the vehicle seat and on the vehicle floor of at least one of the pivot levers are lockable independently of one another.