Sidewardly adjustable seat back

Claim 1

IN A VEHICLE SEAT, A SEAT PART, A BACK PART, FRAME MEANS CONNECTING SAID BACK PART TO SAID SEAT PART, CONNECTING MEANS CONNECTING SAID BACK PART TO SAID FRAME MEANS FOR MOTION IN A GENERALLY HORIZONTAL PLANE BETWEEN A NORMAL BACK-SUPPORTING POSITION AND A PARTIAL SIDE AND BACK SUPPORTING POSITION; AND CONNECTING MEANS BEING COMPRISED OF A FIRST AND A SECOND CONNECTING MEMBER; BOTH OF SAID MEMBERS BEING CONNECTED TO SAID BACK PART BY ANTI-FRICTION MEANS TO PERMIT RELATIVE HORIZONTAL MOVEMENT BETWEEN SAID BACK PART AND SAID MEMBERS; THE FIRST OF SAID MEMBERS BEING PIVOTALLY ATTACHED TO SAID FRAME MEANS TO PERMIT SAID BACK PART TO BE PIVOTED IN RESPECT TO SAID FRAME MEANS AT THE POINT OF ATTACHMENT BETWEEN SAID FIRST MEMBER AND SAID FRAME MEANS; AND THE SECOND OF SAID OF MEMBERS BEING PIVOTALLY ATTACHED TO SAID FRAME MEANS AND INCLUDING A HINGE JOINT INTERMEDIATE ITS POINTS OF ATTACHMENT TO SAID FRAME MEANS AND SAID BACK PART TO THEREBY PERMIT SAID BACK PART TO MOVE TOWARDS AND AWAY FROM SAID FRAME MEANS AS IT IS PIVOTED AT SAID CONNECTION OF SAID FIRST MEMBER AND SAID FRAME MEANS.