Patent ID: 6974190
Filing Date: 2005-12-13
Classification: A47C

Abstract:
1. An armrest adjustment mechanism comprising: a sleeve, at both inner sides of which being lengthwise provided a longitudinal toothed portion; a bracket being moveable in vertical direction and disposed in the sleeve, on a top end of the bracket mounted a moveable assembly and on the bottom of the bracket arranged a first hook portion and a gap located adjacent to the first hook portion; an adjustment rod, a top end of which being folded to form a pulling head, and at a bottom of which formed a second hook portion, the adjustment rod adjustably disposed on the bracket, and a return spring biased between the second hook portion and the first hook portion; a pair of adjustment blocks being assembled to both sides of the adjustment rod by means of positioning pins and located in the gap of the bracket, on each of the adjustment blocks being defined a plurality of slant holes for insertion of the positioning pins, and the slant holes are slanted upward and outward gradually, the adjustment block being provided at its outer side with a toothed portion for engagement with and disengagement from the toothed portion of the sleeve; by pulling the pulling portion of the adjustment rod upward until it slides to the top end of the slant holes of the adjustment blocks, this will cause withdrawal of the adjustment blocks and further lead to disengagement of the toothed portion of the adjustment blocks from the toothed portion of the sleeve, therefore, a height-adjustment of the armrest can be performed, after being adjusted to a desired position, the adjustment rod is released and will be pulled back to its original position by the return spring, so that the positioning pins will slide to the bottom of the slant holes of the adjustment blocks, this will cause outward motion of the adjustment blocks and further lead to an engagement of the toothed portion of the adjustment blocks with the toothed portion of the sleeve, consequently, adjustment of the armrest is accomplished.