Quick release device for headrest of office chair

Abstract

A device for connecting a headrest to a back is disclosed. The device includes a headrest assembly and a fixing seat. The headrest assembly includes a headrest, a support and an adjusting seat. The headrest is pivotedly connected to the support. The support is slidably connected to the adjusting seat. An inner base of the adjusting seat has two rails. Each rail is extended with an inserting wing. Tops of the rails are formed with a blocker. A wall is formed between the rails. The fixing seat has a connecting side facing the adjusting seat. The connecting side has a recess with a closed bottom edge. Two opposite edges of the recess is formed with troughs for receiving the inserting wings. A flexible arm is formed between the two troughs. The flexible arm is stopped by the wall.

What is claimed is: 
     
         1 . A quick release device for an office chair, comprising:
 a headrest assembly, comprising a headrest, a support and an adjusting seat, wherein the headrest is pivotedly connected to the support, the support is slidably connected to the adjusting seat, an inner base of the adjusting seat is formed with two parallel vertical rails, each of the two rails is outward extended with an inserting wing, tops of the two rails are formed with a horizontal blocker at a top side of the inner base, a width of the blocker is greater than an overall width of the two rails, a middle of the blocker is formed with a notch, a wall with a trapezoidal cross-section is formed between the two rails; and   a fixing seat, having a connecting side facing the adjusting seat, the connecting side having a recess with a closed bottom edge, each of two opposite edges of the recess being formed with a trough for receiving the inserting wings of the two rails, a flexible arm which aslant protrudes toward the adjusting seat being formed between the two troughs, and the flexible arm being stopped by the wall.   
     
     
         2 . The quick release device of  claim 1 , wherein the fixing seat is formed with two fixing holes for being fixed onto a chairback. 
     
     
         3 . The quick release device of  claim 2 , wherein the fixing holes are located at junctions between the recess and two side bars of the recess. 
     
     
         4 . The quick release device of  claim 1 , wherein a back of the flexible arm is formed with an indent. 
     
     
         5 . The quick release device of  claim 1 , wherein a top side of the wall is a flat surface which is flush with those of the rails, and the flexible arm is pressed by the wall when the wall is being slid to pass the flexible arm. 
     
     
         6 . The quick release device of  claim 1 , wherein a periphery of the flexible arm is formed with a U-shaped slot.