Patent ID: 7523987
Filing Date: 2009-04-28
Classification: B60N

Abstract:
1. A vehicle seat which includes a seat back having a seat back frame and a head rest having a head rest body provided on the top of the seat back and a stay extending under the head rest body, comprising: a support bracket which supports the stay of the head rest on the seat back frame so that the head rest body is configured to move back and forth; a pressure receiving member which is provided in the seat back and moves rearward when pushed by the body of an occupant; a line member having one end and the other end and located in the seat back; a speed increasing unit which is connected with the one end of the line member and increases the speed corresponding to the motion of the pressure receiving member when the pressure receiving member moves rearward, thereby turning the line member in a direction such that the line member is pulled; and a head rest tilt mechanism which is connected with the other end of the line member and transmits a motion of the line member to the support bracket so that the head rest body moves forward when the line member is pulled, wherein the speed increasing unit comprises a base bracket provided on the seat back frame and connected with the one end of the line member, a dog-legged link mechanism formed of a first arm and a second arm rockably connected to each other, one end of the first arm being rockablv supported by a first shaft on the base bracket, the first and second arms being rockably connected by a second shaft and projecting toward the pressure receiving member, an abutting member provided at a junction between the first and second arms and abuts against the pressure receiving member when the pressure receiving member is moved rearward, a pulley that is mounted on the other end of the second arm and is rotatable around a third shaft on the second arm and around which the line member is passed, and guide means that guides a movement of the pulley so that an angle between the first and second arms increases when the abutting member is pushed rearward by the pressure receiving member.