Abstract: An improved hidden electric power elevating stand structure includes upper and lower symmetric frame bodies, and upper and lower braking rods crossed with each other for fixing the upper and lower frame bodies on their lateral sides longitudinally, a transversal rod disposed at the bottom of the lower braking rod, a bearing installed separately on both sides of the transversal rod, such that the bearing is connected to a sliding track on both sides of the lower frame body, an electric power screw rod connects one of the transversal rods of the lower braking rod to the intersection of the upper braking rod, so that the extension and withdrawal of the screw rod change the intersecting angle of the braking rods and adjust the elevation of the frame bodies for placing an audio/video equipment such as a projector or a speaker.

Abstract: An adjustable suspended shelf structure includes a fixed disc, a suspending rod, an adjusting mechanism and a base; wherein the suspending rod is connected to the fixed disc and its bottom is coupled with the adjusting mechanism, and the adjusting mechanism includes a sphere and a bowl-shape tray, so that the adjusting mechanism is connected to a base having a plurality of longitudinal and transversal long holes to define a suspended shelf. The fixing disc is mounted onto the ceiling, such that an object such as an overhead projector, a lamp or a speaker can be fixed onto the base to constitute a suspending status, and the angle of the object can be adjusted quickly by rotating the sphere of the adjusting mechanism around the tray.