Modified headrest of a chair

Abstract

The present invention has a back supporting module, a front headrest module and an anchor plate. The back supporting module has a positioning base, a moveable base, and a positioning cover. An insertion recess is formed in a top end of the positioning base. The moveable base is mounted in the insertion recess of the positioning base. The moveable base can be moved along the positioning cover. The front headrest module has a linking plate mounted in the moveable base and a headrest board. The anchor plate is mounted on a front surface of the linking plate and is securely connected to the moveable base. The headrest board is connected securely to the linking plate. When moving the headrest board, the level position and height of the moveable base can be adjusted.

What is claimed is: 
     
         1 . A modified headrest of a chair comprising:
 a back supporting module having
 a positioning base having
 an insertion recess formed in a top end of the positioning base; 
 
 a moveable base mounted in the insertion recess; and 
 a positioning cover securely mounted on a back end of the positioning base, the moveable base being moveable along the positioning cover; 
   a front headrest module having
 a headrest board being curved; and 
 a linking plate mounted on and connected to the headrest board, and abutting the moveable base; and 
   an anchor plate mounted on a front surface of the linking plate and securely connected to the moveable base.   
     
     
         2 . The modified headrest of a chair as claimed in  claim 1 , wherein
 the back supporting module has an actuating sheet mounted in the moveable base;   the moveable base is a plate and is mounted in the insertion recess of the positioning base and has
 a positioning groove formed in a front surface of the moveable base; 
   the actuating sheet of the back supporting module is made of soft materials, is mounted in the positioning groove, and has
 a linking arm extending downwardly from an outer edge of the actuating sheet; and 
 a fastening pin formed on a bottom end of the linking arm; 
   the positioning cover is connected to the positioning base and has
 a limit groove formed on a center of the positioning cover and facing the positioning groove of the moveable base; 
 a convex portion formed on and protruding from the limit groove of the positioning cover, and a curved orbit formed between the convex portion and the limit groove; 
 a first arc groove formed in the convex portion; and 
 a second arc groove formed in the convex portion and communicating with the curved orbit. 
   
     
     
         3 . The modified headrest of a chair as claimed in  claim 2 , wherein
 the moveable base has
 multiple positioning pins mounted in the positioning groove; 
   the actuating sheet has
 multiple securing holes formed through the actuating sheet and respectively disposed around the positioning pins. 
   
     
     
         4 . The modified headrest of a chair as claimed in  claim 2 , wherein
 the positioning base has
 an opening formed in a front side of the positioning base; 
 a space formed in the positioning base and communicating with the insertion recess and the opening; and 
 multiple fastening blocks mounted between the opening and an inner wall of the positioning base; and 
   the positioning cover has
 multiple securing holes formed on edges of the positioning cover and corresponding to positions of the fastening blocks. 
   
     
     
         5 . The modified headrest of a chair as claimed in  claim 1 , wherein
 the moveable base has
 two linking rods formed on two opposite sides of the moveable base at a top side of the moveable base; and 
 two protrusions respectively mounted on the linking rods; 
   the linking plate has
 two second grooves formed through the linking plate; and 
 two toothed portions formed on the front surface of the linking plate and located on inner sides of the second grooves; and 
   the modified headrest has an anchor plate mounted on the linking plate and connecting to the moveable base, and the anchor plate has   two engaging teeth formed on two opposite sides of the anchor plate and engaging the toothed portions of the linking plate.   
     
     
         6 . The modified headrest of a chair as claimed in  claim 2 , wherein
 the moveable base has
 two linking rods formed on two opposite sides of the moveable base at a top side of the moveable base; and 
 two protrusions respectively mounted on the linking rods; 
   the linking plate has
 two second grooves formed through the linking plate; and 
 two toothed portions formed on the front surface of the linking plate and located on inner sides of the second grooves; and 
   the modified headrest has an anchor plate mounted on the linking plate and connecting to the moveable base, and the anchor plate has   two engaging teeth formed on two opposite sides of the anchor plate and engaging the toothed portions of the linking plate.   
     
     
         7 . The modified headrest of a chair as claimed in  claim 3 , wherein
 the moveable base has
 two linking rods formed on two opposite sides of the moveable base at a top side of the moveable base; and 
 two protrusions respectively mounted on the linking rods; 
   the linking plate has
 two second grooves formed through the linking plate; and 
 two toothed portions formed on the front surface of the linking plate and located on inner sides of the second grooves; and 
   the modified headrest has an anchor plate mounted on the linking plate and connecting to the moveable base, the anchor plate has   two engaging teeth formed on two opposite sides of the anchor plate and engaging the toothed portions of the linking plate.   
     
     
         8 . The modified headrest of a chair as claimed in  claim 4 , wherein
 the moveable base has
 two linking rods formed on two opposite sides of the moveable base at a top side of the moveable base; and 
 two protrusions respectively mounted on the linking rods; 
   the linking plate has
 two second grooves formed through the linking plate; and 
 two toothed portions formed on the front surface of the linking plate and located on inner sides of the second grooves; and 
   the modified headrest has an anchor plate mounted on the linking plate and connecting to the moveable base, and the anchor plate has   two engaging teeth formed on two opposite sides of the anchor plate and engaging the toothed portions of the linking plate.   
     
     
         9 . The modified headrest of a chair as claimed in  claim 5 , wherein
 the headrest board has
 multiple repositioning rods formed on a back surface of the headrest board; and 
   the linking plate has
 multiple through holes formed through the headrest board and corresponding to the repositioning rods of the headrest board. 
   
     
     
         10 . The modified headrest of a chair as claimed in  claim 6 , wherein
 the headrest board has
 multiple repositioning rods formed on a back surface of the headrest board; and 
   the linking plate has
 multiple through holes formed through the headrest board and corresponding to the repositioning rods of the headrest board. 
   
     
     
         11 . The modified headrest of a chair as claimed in  claim 7 , wherein
 the headrest board has
 multiple repositioning rods formed on a back surface of the headrest board; and 
   the linking plate has
 multiple through holes formed through the headrest board and corresponding to the repositioning rods of the headrest board. 
   
     
     
         12 . The modified headrest of a chair as claimed in  claim 8 , wherein
 the headrest board has
 multiple repositioning rods formed on a back surface of the headrest board; and 
   the linking plate has
 multiple through holes formed through the headrest board and corresponding to the repositioning rods of the headrest board. 
   
     
     
         13 . The modified headrest of a chair as claimed in  claim 1 , wherein
 the headrest board has
 a reposition space formed in a front surface of the headrest board; 
 two first grooves formed through two sides on the repositioning space and being vertical; and 
   the modified headrest has a supporting cushion mounted on a front surface of the headrest board, the supporting cushion has
 two guiding blocks mounted on a back surface of the headrest board and facing the first grooves, wherein lock components are mounted through the fixing holes and the first grooves and are locked in the guiding blocks; and 
 two fixing holes formed through two sides of the supporting cushion. 
   
     
     
         14 . The modified headrest of a chair as claimed in  claim 2 , wherein
 the headrest board has
 a reposition space formed in a front surface of the headrest board; 
 two first grooves formed through two sides on the repositioning space and being vertical; and 
   the modified headrest has a supporting cushion mounted on the front surface of the headrest board, the supporting cushion has
 two guiding blocks mounted on a back surface of the headrest board and facing the first grooves, wherein lock components are mounted through the fixing holes and the first grooves and are locked in the guiding blocks; and 
 two fixing holes formed through two sides of the supporting cushion. 
   
     
     
         15 . The modified headrest of a chair as claimed in  claim 3 , wherein
 the headrest board has
 a reposition space formed in a front surface of the headrest board; 
 two first grooves formed through two sides on the repositioning space and being vertical; and 
   the modified headrest has a supporting cushion mounted on the front surface of the headrest board, the supporting cushion has   two guiding blocks mounted on a back surface of the headrest board and facing the first grooves, wherein lock components are mounted through the fixing holes and the first grooves and are locked in the guiding blocks.   
     
     
         16 . The modified headrest of a chair as claimed in  claim 4 , wherein
 the headrest board has
 a reposition space formed in a front surface of the headrest board; 
 two first grooves formed through two sides on the repositioning space and being vertical; and 
   the modified headrest has a supporting cushion mounted on the front surface of the headrest board, the supporting cushion has
 two guiding blocks mounted on a back surface of the headrest board and facing the first grooves, wherein lock components are mounted through the fixing holes and the first grooves and are locked in the guiding blocks; and 
 two fixing holes formed through two sides of the supporting cushion. 
   
     
     
         17 . The modified headrest of a chair as claimed in  claim 5 , wherein
 the headrest board has
 a reposition space formed in a front surface of the headrest board; 
 two first grooves formed through two sides on the repositioning space and being vertical; and 
   the modified headrest has a supporting cushion mounted on the front surface of the headrest board, the supporting cushion has   two guiding blocks mounted on a back surface of the headrest board and facing the first grooves, wherein lock components are mounted through the fixing holes and the first grooves and are locked in the guiding blocks; and   two fixing holes formed through two sides of the supporting cushion.   
     
     
         18 . The modified headrest of a chair as claimed in  claim 6 , wherein
 the headrest board has
 a reposition space formed in a front surface of the headrest board; 
 two first grooves formed through two sides on the repositioning space and being vertical; and 
   the modified headrest has a supporting cushion mounted on the front surface of the headrest board, the supporting cushion has   two guiding blocks mounted on a back surface of the headrest board and facing the first grooves, wherein lock components are mounted through the fixing holes and the first grooves and are locked in the guiding blocks; and   two fixing holes formed through two sides of the supporting cushion.   
     
     
         19 . The modified headrest of a chair as claimed in  claim 7 , wherein
 the headrest board has
 a reposition space formed in a front surface of the headrest board; 
 two first grooves formed through two sides on the repositioning space and being vertical; and 
   the modified headrest has a supporting cushion mounted on the front surface of the headrest board, the supporting cushion has   two guiding blocks mounted on a back surface of the headrest board and facing the first grooves, wherein lock components are mounted through the fixing holes and the first grooves and are locked in the guiding blocks; and   two fixing holes formed through two sides of the supporting cushion.   
     
     
         20 . The modified headrest of a chair as claimed in  claim 8 , wherein
 the headrest board has
 a reposition space formed in a front surface of the headrest board; 
 two first grooves formed through two sides on the repositioning space and being vertical; and 
   the modified headrest has a supporting cushion mounted on the front surface of the headrest board, the supporting cushion has   two guiding blocks mounted on a back surface of the headrest board and facing the first grooves, wherein lock components are mounted through the fixing holes and the first grooves and are locked in the guiding blocks; and   two fixing holes formed through two sides of the supporting cushion.