Arrangement for the form-locking guidance of a load supported by a top rail, especially of an electrically longitudinally adjustable motor vehicle seat, along at least one bottom rail

An installation for the form-locking guidance of a motor vehicle seat supported by a top rail means along at least one bottom rail means, in which the top rail means includes a base and the bottom rail means includes flanks surrounding the base of the top rail means on both sides thereof, the flanks being provided at the inner sides thereof with ball races cooperating with ball races provided at the base of the top rail means, the bottom rail means further including an upwardly pointing bearing surface means between the flanks thereof, the base of the top rail means being slidingly supported on the upwardly pointing bearing surface means of the bottom rail means characterized in that said base is a component of said top rail extending downwardly from a cross leg of said top rail into the proximity of said bearing surface and being supported on said bearing surface by means of its bottom with braking means provided between the undersurface of said bottom and said bearing surface, and wherein the bottom of the base has a larger area than the cross-sectional area at the top of the base by virtue of extending beyond the top of the base on both sides of the base.