Abstract: A display shelf device includes a support post, a shelf member, and a coupler having a ring member attached to the support post, a bracket attached to the shelf member, and a fastener adjustably securing the bracket and the ring member together at any selected or suitable angular positions. The bracket and the shelf member may thus be easily and quickly adjusted relative to the ring member and the support post at any selected angular position. The bracket includes one or more projections to selectively engage into a number of depressions of the ring member, and to adjustably retain the bracket to the ring member at selected angular position.

Abstract: A structure device includes a number of couplers each having a vertical barrel to receive ends of vertical ducts, and one or more arms extended from the vertical barrel to engage into horizontal conduits. Each of the horizontal conduits includes one or more ears engaged into lock notches via channels of the arms, when the horizontal conduits are rotated relative to the arms, so as to couple the horizontal conduits and the vertical ducts without additional fasteners or tools. One or more covers may have two angle members attached to two corner portions and rotatably engaged into the arms with axles, to rotatably secure the cover to the couplers.

Abstract: A rack device includes one or more shelves, each having one or more collars for being detachably secured onto one or more posts with one or more sleeves. The sleeve includes an enlarged lower portion. The collar includes a bore for receiving the sleeve, and having a narrower middle portion and two greater end portions, for allowing the collar to be invertibly secured onto the enlarged lower portion of the sleeve, and for allowing either of the upper and the lower sides of the shelf to be arranged on the upper portion for supporting various objects.

Abstract: A multilayered rack is composed of four upright rods and a plurality of shelves. The upright rods are provided in the outer wall thereof with a plurality of circular grooves arranged at spaced interval. The shelves are each provided at four corners thereof with a retaining ring and two arcuate pieces, each piece having a locating rib. The shelves are each provided at four corners thereof with two insertion segments and a cross rod. The retaining ring has a fastening block which is provided with two insertion holes for receiving the insertion segments, a concealing portion, and an inverted hook for engaging the cross rod. The shelves are fastened with the upright rods such that the locating ribs of the arcuate pieces of the retaining ring of the shelves are retained in one of the circular grooves of the upright rods.

Abstract: A rack is formed of a plurality of support rods for supporting a plurality of shelves in conjunction with a plurality of locating sleeves and fastening sleeves. The locating sleeves are located on the support rods, whereas the fastening sleeves are fixedly fastened with the shelves by the locating sleeves. The locating sleeves are formed of a first arcuate body provided with an insertion slot, a tenon and a retaining protrusion, and a second arcuate body provided with an insertion slot, a mortise and a retaining protrusion. The locating sleeves are located on the support rods such that the retaining protrusions of the first arcuate body and the second arcuate body are retained in the retaining slots of the support rods, and that the tenon of the first arcuate body is retained in the mortise of the second arcuate body. The fastening sleeves are provided with a gap and two retaining potions separated from each other by the gap.