wire 88 continues around a roller 96 mounted on a cross rod 98 of the seat frame 24 and further to anchoring element 100 next to the pivot 18 of the carrier rod 14 in this manner when the seat frame is pushed rearwardly this movement is translate with transmission ratio 1 2 due to the roller 96 to the wire 88 since the outer end 86 of the wire cannot be pulled inwardly the whole cable loop 92 will be pulled against the fixed anchoring block 94 the pull resulting in an attempt to flatten out the loop 92 whereby an axial counter pressure is excerted on the bracket 90 by the end of the bowden mantle this pressure result in the bracket 90 and therewith the entire unit 80 being pushed outwardly so what really happens is that the bowden mantle is brought to shift its position on the wire 88 the degree of extension of the unit 80 will be a function of the rearward displacement of the seat frame and the system is adjusted in such a manner that the footrest in passing through its vertical position is just free to go clear of the floor while thereafter it is prolonged sufficiently to become a real footrest and not only a leg rest whenever the footrest is swung down a spring 102 between the parts 50 and 80 will effect retraction of the part 50 and thus retraction of the bracket 90 from its position near the wire fixture 86 this amounting to a relative pulling out of the wire 88 and therewith reentry into the mantle of the wire from the roller 96 it will be appreciated that the gear means for controlling the pivoting and the extension of the footrest are.