or make individual adapters 90 may be used for connection to the rail 44 without requiring to use different rails 44 for considering the vehicle operator 39 s requirements for seats to be used still further the guide 46 is clarified as a dovetail guide that allows for a rigid and stable mechanical connection between the rail and the guide 46 as presented in fig1 a and 14 b the mechanism 72 comprises a set of levers arranged for moving the locking body 64 upward and downward the knob 62 is connected to a main lever 92 which extends to a first pivoting point 94 about which the main lever 92 is pivotally coupled this means that by pulling the knob 62 in the drawing plane of fig1 a to the right it rotates with an end opposite to the knob 62 around the first pivoting point 94 the first pivoting point 94 is created through a holder 96 which extends from an inner walling surface 98 of the base body 28 into its interior it is also conceivable that the holder 96 is a part of the flange 48 which extends from the outside into the base body 28 three interconnected levers 100 102 and 104 constitute a lever chain extending from a second pivoting point 106 which is situated on the main lever 92 to the respective locking body 64 the center lever 102 is pivotally supported on a third pivoting point 108 which is located on the flange 48.