Locking device for a seat back of a motor vehicle seat

A seat with a locking device for use in motor vehicle in a vehicle, said seat having a seat part with a seat back frame covered by a seat back cushion, said locking device comprising:

• a locking pin mounted on the seat part;
• at least one locking latch, pivotably mounted on the seat back frame, for engaging said locking pin;
• two unlocking levers pivotably mounted on the seat back frame, a first of said two levers projecting on the left side and a second of said two levers projecting on the right side of the seat back, each of said two levers projecting from an opening made in the seat back cushion for manual operation of said two levers;
• a flexible tensioning element to connect said two unlocking levers with the locking latch;
• wherein the flexible tensioning element is a tension cable guide din two separate flexible sheaths, a first of said two sheaths being fastened near the first and second unlocking levers and the second of said two sheaths being fastened near the second unlocking lever and the locking latch, each endwise on the seat back frame;
• and
• wherein one end of the tension cable is fastened to the first unlocking lever at a distance from its pivot point and the other end of the tension cable is fastened to the locking latch at a distance from its pivot point;
• a rotatably mounted deflecting roller mounted on the second unlocking lever at a distance from its pivot point, said tension cable being guided over the deflecting roller.