Armrest-adjusting mechanism

Claim 1

An armrest-adjusting mechanism comprising: a housing having an interior space and a depression on a first side of the housing, each of a first lengthwise slot and a transverse slot formed across said first lengthwise slot located in said depression, a control board slidably engaged in said depression and said first lengthwise slot, an upper end of said control board having a pull portion and a support post located beside said pull portion, said support post having a first compression spring thereon which bears against a wall of said depression, a lower end of said control board having an arcuate tapering section, a lower support having a second lengthwise slot, each lateral side of said second lengthwise slot having arch shaped notches facing each other, a locking block slidably engaged in said transverse slot of the depression, said locking block spring biased by a second compression spring between a fixing board joined to a second side of the housing and said arcuate tapering section, said locking block having sides selectively engaged or disengaged in or from a pair of said arched shaped notches, a cover board having a window fixed over said depression and said control board with said pull portion extending through said window, wherein when said control board is moved upward by said pull portion against said first compression spring and said arcuate tapering section moves said locking board against said second compression spring to disengage from said lower support to permit sliding adjustment of said housing in relation to said lower support and after release of said pull portion, said first compression spring returns said control board to a rest position, and wherein said locking block is spring biased by said second compression spring to engage a pair of said arch shaped notches opposite the sides of the locking block in the selected position of the housing in relation to the lower support.