Abstract: adjustable keyboard bracket mechanism includes fixed seat provided with first axle for use as pivot and rotatable second axle; bracket set including first support with one end thereof fastened to the first axle and the second axle and the other end thereof provided with third axle, second support having one end thereof fastened to the second axle and the other end thereof provided with fourth axle and adjustment device set fastened to the third axle and the fourth axle, the adjustment device set including rotating adjustment block having two opposite sides thereof respectively provided with first friction wheels and two mating friction blocks each having inner side thereof provided with second friction wheel for fitting the first friction wheel to form the positioning or rotating adjustment status of the adjustment device set; and connecting seat assembled on the rotating adjustment block opposite to the third axle and the fourth axle.

Abstract: adjustable keyboard bracket mechanism includes fixed seat provided with first axle for use as pivot and rotatable second axle; bracket set including first support with one end thereof fastened to the first axle and the second axle and the other end thereof provided with third axle, second support having one end thereof fastened to the second axle and the other end thereof provided with fourth axle and adjustment device set fastened to the third axle and the fourth axle, the adjustment device set including rotating adjustment block having two opposite sides thereof respectively provided with first friction wheels and two mating friction blocks each having inner side thereof provided with second friction wheel for fitting the first friction wheel to form the positioning or rotating adjustment status of the adjustment device set; and connecting seat assembled on the rotating adjustment block opposite to the third axle and the fourth axle.

Abstract: A lifting device is disclosed. A base frame of the lifting device includes a first combination member, a sliding frame, a sliding groove on the sliding frame and having sliding holes, and shafts slidably disposed in the sliding holes. A conveyor is mounted on the two shafts and combined with the combination member, and the sliding frame is combined with the first lifting frame, and a sliding rod of the second lifting frame is disposed in the sliding groove, and a locating member is disposed on the sliding rod and combined with the conveyor. When the second lifting frame is vertically moved, the locating member can drive conveyor to move, and the conveyor can simultaneously drive the two shafts to slide in the sliding holes, and the second lifting frame can be slid on the sliding frame, to adjust the height of the second lifting frame individually.