Patent ID: 6905102

Claim:
A keyboard support bracket structure fastened to a underside of a desktop movable horizontally and vertically relative to the desktop to a desired position for keyboard operation, comprising: a mounting bracket fastening to the desktop; an upper arm pivotally engaged with the mounting bracket through a first axle; a side arm pivotally coupled on two sides of the mounting bracket through a second axle; and a holding bracket pivotally engaged with the upper arm through a third axle and pivotally engaged with the side arm through a fourth axle; wherein the first, second and third axles are pivotally engaged on fixed locations to form a linkage movement, the side arm having an adjusting hole formed on the pivotal connection location for the fourth axle that has a transverse width greater than the outer diameter of the fourth axle, and a brake element which has a brake side facing the holding bracket, the holding bracket having an arched displacement slot corresponding to the adjusting hole that has an adjustment track, the displacement slot having an outer side to form a harness side corresponding to and bucking against the brake side of the brake element such that when holding bracket is moved upwards the fourth axle is moved in the displacement slot along the adjustment track in the adjusting hole towards the direction of the holding bracket and drives the holding bracket to move outwards to separate the harness side from the brake side so that the holding bracket is movable vertically by a force through the first, second and third axles.