Memory apparatus for the back of a chair

Abstract

A memory device installed in a backrest of a chair is disclosed. The memory device includes a plurality of support shafts, a plurality of housings receiving the plurality of support shafts, a support block inserted in the respective housings and having a plurality of fixing grooves formed on both sides thereof, a spring for resilient supporting the support block, a setting block having one end rotatably receiving the support shaft, in a state where the setting block is inserted in both sides of the housing, and the other end with a fixing boss inserted in the fixing groove, a setting spring for resiliently supporting the setting block, a rotary lever connected to the setting block via a wire, a support plate connected to the rotary lever by a hinge, and having a setting groove and a release groove formed on an surface thereof, an operation lever resiliently installed on the rotary lever by a support spring, and a setting pin integrally formed with the operation lever and selectively inserted in the setting groove or the release groove. The memory device further includes a housing having a receiving hole which is stacked on an upper portion of the support shaft, with a portion of a lower part of the backrest of the chair being stacked with the support blocks. The housing is installed at a portion corresponding to cervical vertebra, and has a plurality of pocket grooves, a support pocket is inserted in the respective pocket grooves, and a guide shaft protrudes from the respective pocket grooves.

1 . A memory device installed in a backrest of a chair, comprising:
 a plurality of support shafts  300 ;   a plurality of housings  110  receiving the plurality of support shafts  300 ;   a support block  120  inserted in the respective housings  110  and having a plurality of fixing grooves  126  formed on both sides thereof;   a spring  122  for resilient supporting the support block  120 ;   a setting block  320  having one end rotatably receiving the support shaft  300 , in a state where the setting block is inserted in both sides of the housing  110 , and the other end with a fixing boss  321  inserted in the fixing groove  126 ;   a setting spring  324  for resiliently supporting the setting block  320 ;   a rotary lever  340  connected to the setting block  320  via a wire  330 ;   a support plate  370  connected to the rotary lever  340  by a hinge  373 , and having a setting groove  372  and a release groove  371  formed on an surface thereof;   an operation lever  350  resiliently installed on the rotary lever  340  by a support spring  351 ; and   a setting pin  360  integrally formed with the operation lever  350  and selectively inserted in the setting groove  372  or the release groove  371 .   
     
     
         2 . The memory device as claimed in  claim 1 , wherein an arc portion  124  is formed on a front surface of the support block  120  in view of ergonomics, and an extension  123  is respectively formed on both sides of the support block  120 . 
     
     
         3 . The memory device as claimed in  claim 1 , wherein an interval maintaining member  310  is formed on the support shaft  300  to maintain an interval between the housings  110 . 
     
     
         4 . The memory device as claimed in  claim 1 , further comprising a housing  510  having a receiving hole  511  stacked on an upper portion of the support shaft  300 , with a portion of a lower part of the backrest of the chair being stacked with the support blocks  120 , in which the housing  510  is installed at a portion corresponding to cervical vertebra, and has a plurality of pocket grooves  512 ; a support pocket  400  is inserted in the respective pocket grooves  512 ; and a guide shaft  513  protrudes from the respective pocket grooves  512 .