Height-adjustable armrest unit for a chair

摘要: A height-adjustable armrest unit for a chair includes support, generally upright sleeve, leverage body, and biasing member. The support is fixed on seat of the an plate portion which has guiding slot formed therethrough column engaging notches communicated with slot. sleeve mounted support. body intermediate pivotally first inner wall actuated upper end portion, lower lock pin axially projecting therefrom extending slidably into in portion. member biases to push engage selected one notches. can be against action disengage from so as retract are movable relative by shifting along enable engagement another