Headrest

Abstract

Provided is an adjustable headrest installed at an upper portion of a seatback of a chair which a user's head contacts characterized in that an ergonomic head-shaped recess is provided such that the recess is adjusted to be appropriate to different head sizes, head shapes, and neck shapes of users to conveniently seat the neck and the head, allowing the user to rest and sleep on the chair. The adjustable headrest mounted on the chair includes an upper block having an upper recess concaved in the front thereof to seat the head, and a lower block disposed under the upper block and having a lower recess concaved in the front thereof to seat the neck. Here, the upper block and the lower block are movable relative to each other.

1 . A headrest mounted on a chair, comprising:
 an upper block having an upper recess concaved in the front thereof to seat a head; and   a lower block disposed under the upper block and having a lower recess concaved in the front thereof to seat a neck,   the upper block and the lower block are movable relative to each other.   
     
     
         2 . The headrest according to  claim 1 , further comprising a forward/rearward adjustment means configured to slide the upper block and the lower block to relatively move the upper block and the lower block in a forward/rearward direction. 
     
     
         3 . The headrest according to  claim 1  or  2 , further comprising a main frame on which the upper block and the lower block are mounted. 
     
     
         4 . The headrest according to  claim 3 , wherein the upper block comprises an upper frame and a shock absorbing member received in the upper frame and coupled to the upper frame,
 the lower block comprises a lower frame and a shock absorbing member received in the lower frame and coupled to the lower frame, and   the forward/rearward adjustment means comprises a forward/rearward adjustment pinion gear installed at the main frame, and a forward/rearward adjustment rack gear coupled to the upper frame to be meshed with the forward/rearward adjustment pinion gear.   
     
     
         5 . The headrest according to  claim 4 , wherein the main frame comprises a bottom plate and a rear wall extending upward from a rear side of the bottom plate,
 the upper block and the lower block are disposed in the front of the rear wall and installed over the bottom plate,   a through-hole is formed to pass through the rear wall in a forward/rearward direction, and   the forward/rearward adjustment rack gear passes through the through-hole to be meshed with the forward/rearward adjustment pinion gear.   
     
     
         6 . The headrest according to  claim 5 , comprising a forward/rearward sliding protrusion is formed at any one of a lower portion of the upper block and an upper portion of the lower block, and a forward/rearward sliding groove into which the forward/rearward sliding protrusion is inserted to be guided is lengthily formed in the other one in a forward/rearward direction. 
     
     
         7 . The headrest according to  claim 1 , comprising a leftward/rightward adjustment means configured to adjust widths of the upper block or the lower block. 
     
     
         8 . The headrest according to  claim 7 , further comprising a main frame on which the upper block and the lower block are mounted. 
     
     
         9 . The headrest according to  claim 8 , comprising the lower block includes a right lower block and a left lower block,
 the left lower block includes a left lower frame and a shock-absorbing member coupled to the left lower frame,   the right lower block includes a right lower frame and a shock-absorbing member coupled to the right lower frame, and   the leftward/rightward adjustment means comprise a leftward/rightward adjustment rod installed in the main frame and having two screw gears formed on an outer circumference thereof in opposite directions; and   leftward/rightward adjustment protrusions having screw gears formed on inner circumferences thereof to be meshed with the screw gears of the leftward/rightward adjustment rod, and coupled to the right lower frame and the left lower frame, respectively,   wherein the leftward/rightward adjustment protrusion of the right lower frame and the leftward/rightward adjustment protrusion of the left lower frame are moved in opposite directions by rotation of the leftward/rightward adjustment rod.   
     
     
         10 . The headrest according to  claim 9 , wherein the main frame comprises a bottom plate and a rear wall extending upward from a rear end of the bottom plate,
 the leftward/rightward adjustment rod is installed in the rear wall of the main frame,   a left coupling hole and a right coupling hole are formed in the rear wall of the main frame to correspond to the two screw gears of the leftward/rightward adjustment rod, and   the leftward/rightward adjustment protrusions protrude rearward from the left lower frame and the right lower frame to be inserted into the left coupling hole and the right coupling hole.   
     
     
         11 . The headrest according to  claim 9 , wherein leftward/rightward sliding grooves are lengthily formed in the main frame in a leftward/rightward direction, and
 leftward/rightward sliding protrusions inserted into the leftward/rightward sliding grooves protrude outward from the right lower frame and the left lower frame.   
     
     
         12 . The headrest according to  claim 1 , wherein a height adjustment rack gear is vertically coupled to a lower portion of the main frame, and
 the height adjustment rack gear is meshed with a height adjustment pinion gear to move the main frame upward and downward by rotation of the height adjustment pinion gear.   
     
     
         13 . The headrest according to  claim 1 , wherein the upper block comprises an upper frame and a shock absorbing member coupled to the upper frame,
 the lower block comprises a lower frame and a shock absorbing member coupled to the lower frame,   the lower frame comprises side plates, a rear plate disposed at rear sides of the side plates, a bottom plate disposed at lower ends of the side plates and the rear plate, and a middle plate disposed over the bottom plate and spaced apart from the bottom plate,   the upper frame is disposed over the middle plate of the lower frame, and   a shock absorbing member is disposed between the middle plate and the bottom plate of the lower frame.   
     
     
         14 . The headrest according to  claim 13 , wherein forward/rearward sliding protrusions protrude outward from the side plates of the upper frame, and
 forward/rearward sliding slits into which the forward/rearward sliding protrusions are inserted and guided are formed in the side plates of the lower frame.   
     
     
         15 . The headrest according to  claim 14 , wherein forward/rearward sliding slits are formed in the side plates of the main frame in a shape corresponding to the forward/rearward sliding slits of the lower frame. 
     
     
         16 . The headrest according to  claim 1 , further comprising an angle adjustment means configured to enable angle adjustment between a chair and the headrest. 
     
     
         17 . The headrest according to  claim 1 , wherein at least a portion of the upper block and the lower block is formed of a material comprising at least one of latex foam, memory foam, urethane foam and sponge. 
     
     
         18 . The headrest according to  claim 3 , comprising an upward/downward through-holes are formed in the lower block and the main frame to correspond to each other, and
 the forward/rearward adjustment means includes a forward/rearward adjustment rod coupled to the upper block at its upper end and configured to project downward from the main frame at its lower end through the upward/downward through-holes of the lower block and the main frame, and a forward/rearward adjustment handle threadedly engaged with the forward/rearward adjustment rod at a lower portion of the main frame.   
     
     
         19 . The headrest according to  claim 8 , comprising the lower block includes a left lower block and a right lower block,
 a forward/rearward through-hole is lengthily formed in the main frame in a leftward/rightward direction to pass through the main frame in a forward/rearward direction, and   the leftward/rightward adjustment means includes a leftward/rightward adjustment rod coupled to the left lower block and the right lower block at its front end and configured to project rearward from the main frame at its rear end through the forward/rearward through-hole of the main frame, and a leftward/rightward adjustment handle threadedly engaged with the leftward/rightward adjustment rod at a rear side of the main frame.   
     
     
         20 . A headrest mounted on a chair, comprising:
 an upper block having an upper recess concaved in the front thereof to seat a head; and   a lower block disposed under the upper block and having a lower recess concaved in the front thereof to seat a neck,   wherein a portion of the lower block projects forward from the upper block,   wherein at least a portion of the upper block and the lower block is formed of a material comprising at least one of latex foam, memory foam, urethane foam and sponge.   
     
     
         21 . The headrest according to  claim 20 , wherein a front surface of the upper block and a front surface of the lower block are stepped to form a step surface,
 wherein the step surface is inclined upward from a front side to a rear side.   
     
     
         22 . The headrest according to  claim 21 , comprising
 the upper block and the lower block are formed integrally with each other,   
     
     
         23 . The headrest according to  claim 20 , wherein the upper block comprises an upper frame and a shock absorbing member received in the upper frame and coupled to the upper frame,
 the lower block comprises a lower frame and a shock absorbing member received in the lower frame and coupled to the lower frame, and   wherein the shock absorbing member is formed of a material comprising at least one of latex foam, memory foam, urethane foam and sponge.   
     
     
         24 . The headrest according to  claim 23 , further comprising a tilt adjustment means coupled to the upper frame at its upper portion and coupled to the lower frame at its lower portion,
 wherein the tilt adjustment means enables relative movement of the upper frame and the lower frame in a forward/rearward direction.   
     
     
         25 . The headrest according to  claim 24 , further comprising an angle adjustment means configured to adjust an angle of the headrest. 
     
     
         26 . The headrest according to  claim 24 , wherein the lower block includes a right lower block and a left lower block, and
 the left lower block and the right lower block are movable in a leftward/rightward direction.   
     
     
         27 . The headrest according to  claim 20 , comprising the upper block and the lower block are movable relative to each other. 
     
     
         28 . An adjustable headrest comprising:
 an upper support having an upper recess configured to seat a head and formed in the front thereof; and   a lower support disposed under the upper support and having a lower recess configured to seat a neck and formed in the front thereof,   wherein a cutout portion is formed in the upper support so that the upper support can be expanded and contracted leftward and rightward about the cutout portion.   
     
     
         29 . The adjustable headrest according to  claim 28 , comprising the upper support has a rear recess formed in the rear. 
     
     
         30 . The adjustable headrest according to  claim 28 , wherein left and right sides of the upper recess of a front end of the upper support are disposed behind a front end of the lower support. 
     
     
         31 . The headrest according to  claim 29 , wherein an air bag is coupled to the rear recess so that the cutout portion moves forward and rearward and is widened or narrowed in a leftward/rightward direction as air is filled into the air bag or discharged therefrom. 
     
     
         32 . The adjustable headrest according to  claim 28  or  29 , wherein the upper support and the lower support comprise at least one of latex foam, memory foam, urethane foam, and sponge. 
     
     
         33 . The adjustable headrest according to  claim 30 , wherein the upper support and lower support are stepped to form a step surface between the upper support and lower support,
 the step surface is inclined upward from a front side to a rear side thereof.