Height control apparatus for headrest and chair comprising same

Abstract

A height control apparatus for a headrest, includes: an installation part formed to be recessed forward on a back surface of a headrest main body; support members provided on both left and right end portions of the installation part; a height control guide block inserted between the back surface of the headrest main body, which corresponds to the installation part, and the support member; and a frictional force generator coupled to front surfaces of a pair of guide protrusions, which correspond to both left and right end portions of the height control guide block, and being in contact with the back surface of the headrest main body, which corresponds to the installation part, to generate a frictional force corresponding to a reaction force of an initial operating force provided by a user.

1 . A height control apparatus for a headrest, comprising:
 an installation part formed to be recessed forward on a back surface of a headrest main body;   support members provided on both left and right end portions of the installation part;   a height control guide block inserted between the back surface of the headrest main body, which corresponds to the installation part, and the support member; and   a frictional force generator coupled to front surfaces of a pair of guide protrusions, which correspond to both left and right end portions of the height control guide block, and being in contact with the back surface of the headrest main body, which corresponds to the installation part, to generate a frictional force corresponding to a reaction force of an initial operating force provided by a user.   
     
     
         2 . The height control apparatus of  claim 1 , wherein a plurality of catch grooves are formed to be vertically recessed continuously rearward in the front surface of the support member, and
 a haptic catch part caught by being elastically supported by the plurality of catch grooves is provided on a rear surface of the height control guide block.   
     
     
         3 . The height control apparatus of  claim 1 , wherein the frictional force generator is formed of a flexible material. 
     
     
         4 . The height control apparatus of  claim 1 , wherein the frictional force generator is formed of a frictional material that generates a predetermined frictional force between the frictional force generator and the back surface of the headrest main body, which corresponds to the installation part. 
     
     
         5 . The height control apparatus of  claim 1 , wherein the frictional force generator is formed so that a front end has an amount of protrusion generating the frictional force on the back surface of the headrest main body, which corresponds to the installation part, from the front surface of the height control guide block. 
     
     
         6 . The height control apparatus of  claim 2 , wherein the haptic catch part includes:
 an elastic block installed by being inserted into a support groove formed in the back surface of the height control guide block; and   a haptic roller which is elastically supported by a predetermined elastic force by the elastic block and of which a part of an outer circumferential surface protrudes to the outside of the support groove and is in contact with the catch groove of the support member, and   the frictional force of the frictional force generator is set considering an elastic force provided by the elastic block.   
     
     
         7 . The height control apparatus of  claim 1 , further comprising a rear cover panel which is coupled to a rear portion of the headrest main body and in which a through hole is formed so that a space corresponding to the installation part communicates rearward. 
     
     
         8 . The height control apparatus of  claim 7 , wherein each of left and right inner ends of the through hole is provided to have a separation distance in which the support member is capable of being hidden from the outside. 
     
     
         9 . The height control apparatus of  claim 1 , wherein a separation distance between an upper end of the installation part and an upper end of the support member is formed to be greater than a vertical length of the pair of guide protrusions of the height control guide block. 
     
     
         10 . The height control apparatus of  claim 1 , further comprising a guide panel coupled to the back surface of the headrest main body, which corresponds to the installation part, and formed to guide a vertical movement of the height control guide block. 
     
     
         11 . The height control apparatus of  claim 10 , wherein a length between both left and right ends of the guide panel is provided to correspond to a separation distance of the pair of guide protrusions. 
     
     
         12 . A chair comprising the height control apparatus for a headrest of  claim 1 .