Adjustable armrest for a seating unit

An armrest assembly provided for a seating unit, the armrest assembly comprising:

• an armrest for supporting an arm of an occupant of the seating unit;
• a support mounted to the seating unit, wherein the support includes tubular column extending from near a seat of the seating unit towards the armrest, the tubular column having an interior surface;
• a mounting plate that is moveably coupled to the armrest;
• and
• a lift mechanism for enabling vertical adjustment of the armrest, wherein the lift mechanism is telescopically mounted within the tubular column, the lift mechanism comprising:
• (a) a support member that is fixedly attached to the mounting plate and that includes a first set of aligned and spaced apart ribs;
• (b) a control bar that transitions between a first position and a second position with respect to the support member and that includes one or more slots;
• and
• (c) a rack having a series of locking teeth, a portion positioned between the support member and the control bar, and one or more ride elements protruding from the portion and positioned in each of the one or more slots of the control bar,
• wherein the rack includes a second set of aligned and spaced apart ribs, and
• wherein transition of the control bar from the first position to the second position slidably traverses the one or more protruding ride elements through the one or more slots and moves the second set of aligned and spaced apart ribs to interdigitate with the first set of aligned and spaced apart ribs.