Headrest apparatus for a vehicle seat

Abstract

According to an aspect of the present invention, a headrest apparatus for a vehicle seat includes a support portion mounted on the vehicle seat, a movable portion supported at the support portion for moving forward, a first arm and a second arm being crossed and rotatably connected each other by a rotation axis and supporting the movable portion to the support portion, and a biasing member provided between the support portion and the movable portion for biasing the movable portion forward relative to the support portion.

1 . A headrest apparatus for a vehicle seat comprising: 
 a support portion being adapted to be mounted on the vehicle seat;    a movable portion supported at the support portion for moving forward;    a first arm and a second arm being crossed and rotatably connected each other by a rotation axis and supporting the movable portion to the support portion; and    a biasing means provided between the support portion and the movable portion for biasing the movable portion forward relative to the support portion.    
     
     
         2 . The headrest apparatus according to  claim 1 , wherein 
 the first arm and the second arm rotate to open in an fore-aft direction by biasing force of the biasing means to move the movable portion from an original position to an extended position; and wherein    the first arm and the second arm rotate to close in the fore-aft direction to move the movable portion from the extended position to the original position.    
     
     
         3 . The headrest apparatus according to  claim 2 , wherein 
 a first end of the first arm is rotatably connected to the support portion and a second end of the first arm is rotatably and slidably connected to the movable portion; and wherein    a first end of the second arm is rotatably connected to the movable portion and a second end of the second arm is rotatably and slidably connected to the support portion.    
     
     
         4 . The headrest apparatus according to  claim 3 , further comprising: 
 a stopper member ( 15 ) for restraining a sliding movement of the second end of the first arm relative to the movable portion and a sliding movement of the second end of the second arm relative to the support portion to maintain the movable portion at the extended position.    
     
     
         5 . The headrest apparatus according to  claim 3 , further comprising: 
 a lock member couples either one of the first and second ends of the first arm and either one of the first and second ends of the second arm for stopping the first and the second arms to prevent relative movement thereof in the fore-aft direction to maintain the movable portion at the original position.    
     
     
         6 . The headrest apparatus according to  claim 1 , wherein 
 the biasing means includes a coil spring coiled about the rotation axis of the first arm and the second arm; and wherein    the coil spring couples one end of the first arm and one end of the second arm.