Patent ID: 7455363

Claim:
A device for moving a headrest back and forth, comprising a stay ( 114 ) mounted with a horizontal portion ( 112 ) and a pair of parallel vertical portions ( 110 ); a ratchet member (RM) provided with a gear portion ( 116 ) formed with a plurality of teeth ( 116 a ) and a jaw ( 116 b ) and disposed on a central part of the horizontal portion ( 112 ) of the stay ( 114 ); a tilt adjusting device (TAD) comprising a pair of parallel members, each having a lower portion in pivotal engagement with the horizontal portion ( 112 ) of said stay ( 114 ); a check member (CM) comprising one or a pair of pivotable gears ( 120 ) having teeth ( 120 a ) to travel on and engage with the teeth ( 116 a ) of said ratchet member (RM) installed so that the reverse rotation of said tilt adjusting device (TAD) may be prevented; a back and forth movement device (MD) comprising a pair of parallel members, one end of which is pivotably connected to the horizontal portion ( 112 ) of said stay ( 114 ), adjoining said ratchet member (RM) and arranged to move the headrest back and forth; a first torsion coil spring ( 130 ), two ends of which are respectively hooked on the horizontal portion ( 112 ) of said stay ( 114 ) and one of the parallel members of said tilt adjusting device (TAD) or said back and forth movement device (MD); one or a pair of second torsion coil springs ( 121 ) having one end hooked on said pivotable gear ( 120 ); and a mobile shaft ( 122 ) axially mounted to pass through upper portions of the parallel members of said back and forth movement device (MD).