Seat especially for motor vehicles

Claim 1

A seat having a seat part and a back rest, said back rest comprising a substantially rigid frame having substantially horizontal upper and lower frame members and lateral frame members connecting said upper and lower frame members to each other, a padding support divided into an upper part and a lower part, upper pivot means for pivotably connecting said upper part near its upper end to said upper frame member, and lower pivot means for pivotably connecting said lower part near its lower end to said lower frame member, said upper and lower pivot means having substantially horizontal axes, adjusting means for pivoting said two parts to different positions relative to each other about said upper and lower axes and for maintaining said two parts in each of said positions, and padding means connected to one side of said two parts, said two parts of said padding support consist of two substantially rigid plates, and flexible means connecting said plates to each other at their edges facing each other, said two plates are curved in opposite directions to each other and said flexible means pivotably connect said edges of said plates to each other, said adjusting means being adapted to act upon one of said plates adjacent to said edges to pivot both of said plates simultaneously in opposite directions about said axes, said pivot means on one of said parts also being slidably connected to one of said horizontal frame members so as to be slidable substantially in the direction of said lateral frame members when said plates are being adjusted by said adjusting means from one position to a different position relative to each other.