Abstract: A fixture can include a frame having a central portion that is open and unobstructed. Magnets can be coupled to the frame. An adhesive can be configured to bond the frame to a surface. A decoration can have a metal frame that is configured to detachably couple to the magnets of the frame. The decoration can detachably extend from the frame and the surface, such that it is secured to the frame only by magnetic force.

Abstract: The present utility model discloses a lampshade comprising fasteners, a lampshade body and support frames; the lampshade body comprises a light transmitting sheet and a piece of lampshade cloth; the bottom and/or top of the lampshade body are/is designed with soft band-shaped reinforcing ribs which extend in the length direction of the side wall surface and cover the lampshade body and prop up against at least one fastener; in the present utility model, the bottom and/or top of the lampshade body are/is designed with soft band-shaped reinforcing ribs which extend in the length direction of the side wall surface, the integration of the reinforcing ribs and the matching fasteners with the flexibility of the soft material makes the lampshade easy to be packaged and reduce the volume of its package and finally lower the transportation cost.

Abstract: Embodiments are generally directed to a sound-dampening light fixture. In one embodiment, the sound-dampening light fixture includes the following: a structural center portion that includes a housing for a light source, and at least one interconnecting ring that includes connection points for connecting panels to the interconnecting ring. The sound-dampening light fixture also includes panels arranged circumferentially around the structural center portion. The panels are connected to the interconnecting ring at the connection points. The panels are arranged at angles that are designed to dampen sound waves, and are constructed from material that further dampens sound waves coming into contact therewith.

Abstract: An apparatus and method for protecting an electrical connection from the environment is provided. The apparatus includes a cover and a base attached to the bottom portion of the cover forming an enclosed chamber with the cover. The apparatus can further include a support post configured to elevate the enclosed chamber above a ground surface, wherein the first end of the support post is attached to and extends downward from the base and the second end of the support post is configured to be mounted on or to the ground surface.

Abstract: The invention provides a lampshade, which solves the problem that the prior art lampshade adopts an overall package and has high transportation cost and is easy to be damaged. A lampshade includes at least two ring covers arranged one above the other and a lampshade cloth surrounding an outer circumferential wall of each of the ring covers to form a closed cover body, the lampshade cloth comprising a mounting surface and a decorative surface, which are oppositely disposed. A rib and a groove for connecting and fixing the lampshade cloth and the ring cover are disposed between the outer circumferential wall of the ring cover and the mounting surface of the lampshade respectively; the rib and the groove are elastically snap-fitted; and the lampshade cloth is elongated and both ends of it are detachably connected with each other.

Abstract: A lampshade is provided with a longitudinal slit to receive a lampshade cover. According to one embodiment of the present invention, the lampshade includes an external surface and an internal surface. At least one fastener is affixed to an internal surface of the lampshade. The lampshade also includes at least one longitudinal slit on its outer surface. The longitudinal slit is configured to receive both ends of at least one lampshade cover. The lampshade cover includes decoration on an external surface. At least one fastener is affixed to an internal surface of the cover. A further embodiment of the present invention utilizes a method of applying a lampshade cover to a lampshade.

Abstract: Provided is a soft box having a plurality of poles, an adapter ring having a plurality of holes into which the plurality of poles is correspondingly coupledly inserted, and a reflecting cloth adapted to connect the plurality of poles in such a manner as to reflect light therefrom, the soft box including: a zipper mounted on the reflecting cloth between the neighboring poles; and an auxiliary reflecting cloth disposed on the reflecting cloth adjacent to the inner side of the zipper along the longitudinal direction of the zipper in such a manner as to cover the inner surface of the zipper.

Abstract: A magnetic lampshade frame assembly comprises: a frame device, including upper and lower frames; a hood device, including a hood, a connecting strip separately formed at upper and lower positions of an internal side of the hood, and an external side of the connecting strip being fixed to the hood, and an internal side of the connecting strip being magnetically coupled to the upper frame or the lower frame, and at least one of the connecting strip and the upper frame or at least one of the connecting strip and the lower frame is made of a magnetic material, so as to achieve the effects of saving the material of the lamp, assembling or disassembly a lampshade quickly and conveniently, avoiding damages of a lampshade, providing a secured connection between the hood and the frame, and improving the texture to enhance the added value of the lamp product.

Abstract: A lamp shade cover that fits snugly over a lamp shade or lamp shade liner to provide interchangeable lamp shade decor with a tailored look. In embodiments, a separating closure mechanism attaches sides of the lamp shade cover together to form a lamp shade form that fits snugly over the supporting lamp shade or lamp shade liner. In embodiments, the separating closure mechanism is a separating zipper sewn into either side of the lamp shade cover. Embodiments include an interchangeable lamp shade system that includes a lamp shade liner and one or more lamp shade covers that fit snugly over the lamp shade liner and are removable via the separating closure mechanism of the lamp shade cover.

Abstract: A lampshade includes a top lampshade frame, a bottom lampshade frame, a lampshade covering covering the top lampshade frame and the bottom lampshade frame, hook materials (or loop materials) provided at the top lampshade frame and the bottom lampshade frame, and loop materials (or hook materials) provided at the lampshade covering and detachably fastened to the hook materials (or loop materials) to secure the lampshade covering to the top lampshade frame and the bottom lampshade frame.

Abstract: Apparatus to attach a shade or skirt to a hanging light fixture without the need to detach the fixture from the ceiling and/or to disassemble the body of the fixture, the apparatus having an upper retaining means, a height adjustment means and a plurality of support means having a first end connected to the shade or skirt, said shade or skirt having a covered peripheral frame defining an open interior and another end connected to the upper retaining means.

Abstract: An actuator system for a lighting system includes a shape memory alloy coupled to a component of the lighting system to control an actuation of the component and thereby produce a plurality of light patterns and an electrical control circuit in electrical communication with the shape memory alloy to selectively provide an electrical current to the shape memory alloy for controlling a physical property of the shape memory alloy and thereby the motion of the component of the lighting system.

Abstract: A lampshade system which utilizes a simplified lampshade design that does not require integrally manufactured frame components. The lampshade can be manufactured in a flattened position to optimize shipping, storage and display space and which may be easily assembled into a three-dimensional lampshade position by an end user at the point of use.

Abstract: The invention provides a diffuser for a portable light tower that has an envelope of fire resistant material designed to diffuse light situated on a frame forming a generally spherical structure that can be opened and closed by use of a pulley and cable system.

Abstract: A foldable lamp shade includes a shade body, an upper support ring, a plurality of locking members, a lower support ring, a plurality of hanging hooks, and a plurality of support bars. Thus, the user only needs to hook the hook hole of each of the support bars on the respective hanging hook and to insert the insertion portion of each of the support bars into the locking slot of the respective locking member so as to mount the support bars between the upper support ring and the lower support ring by the respective hanging hook and the respective locking member so that the lamp shade is assembled easily and quickly, thereby facilitating the user assembling the lamp shade.

Abstract: A lamp shade which can be collapsed to reduce its size for shipping, display and storage, having an upper ring, a lower rings, and a cover. The cover of the lampshade is relatively stiff, particularly when formed into a taught cone or cylinder. It is self supporting when assembled, but the cover may still be collapsed when disassembled for shipment or storage. In one embodiment, the rings are placed into corresponding upper and lower edges of the cover and held in place by press-fitting a plurality of fitting nubs protruding from the perimeter of the rings into sockets attached along the insides of the edges. In another embodiment, the rings are held in place by press-fitting the band of the rings between jaws of a plurality of clips placed around the edges. In a third embodiment, the rings are held in place by a combination of the above two methods.

Abstract: A wire frame means for structurally supporting a light shading material is provided, wherein the light shading material is joined onto a least one side of the structural supporting means that is not a top or bottom side thereof. Means, such as mounting tabs, are further provided for removably joining the structural supporting means to the wall mounted light fixture.

Abstract: A detachable lampshade includes an upper ring and a lower ring parallel to each other. Multiple shades are made of a resilient material and are bent outside the upper ring and the lower ring. Each shade has two rods respectively provided at two sides thereof A plurality of tubes is provided between the upper ring and the lower ring. Each tube has a channel longitudinally defined through an outer periphery of the tube. An upper slot and a lower slot are transversally defined at a diametrically opposite side of the channel for respectively locating the upper ring and the lower ring. The adjacent rods are received in the respective tubes through the channels and positioned between the upper ring and the respective upper slots, and between the lower ring and the respective lower slots.

Abstract: A lamp shade which can be folded to reduce its size for shipping, display and storage, having an upper ring, a lower ring, and a number of supports interconnecting, separating and supporting the upper and lower rings. In one embodiment, the supports are separate trapezoid-shaped single piece supports which are disconnected from the rings for collapsing the lampshade. In another embodiment, the supports are separate U-shaped single piece supports which are disconnected from the rings for collapsing the lampshade. In another embodiment, the supports are U-shaped single piece supports loosely attached to the upper ring of the lampshade at the center of each support and which are disconnected from the lower ring for collapsing the lampshade.

Abstract: A lampshade assembly includes a rib retaining unit and a plurality of shade members. The rib retaining unit includes a lower rib retaining member, an upper rib retaining member superimposed on the lower rib retaining member, and a fastening member for securing together the lower and upper rib retaining members. The connecting rib has a distal end retained removably on the rib retaining unit. The shade members are disposed adjacent to each other, and cooperate to form a lamp containing space when the distal ends of the connecting ribs of the shade members are retained on the rib retaining unit.

Abstract: A lampshade adapter for a votive candle holder including a lower band or ring for seating the adapter over the upper rim of the votive candle holder. An upper band or ring located above the lower ring and supported by rods extending between the lower and upper rings allows a lampshade to be suspended over the votive candle holder.

Abstract: A lampshade assembly comprises a lampshade and a connection mechanism. The lampshade has a plurality of lampshade pieces. The connection mechanism has a plurality of connecting rods each of which is respectively attached to the lampshade pieces. The connection mechanism further comprises an upper cap, a first fitting piece, a fitting set and a spring. When the spring is stretched outwardly to separate the upper cap from the first fitting piece and then stack the lampshade pieces. When the lampshade pieces are assembled, the connecting rods radiate around a circle. Since the space occupied by the lampshade assembly is reduced, the packing cost and the transport cost are reduced.

Abstract: A collapsible lampshade structure includes an upper fixing ring provided with a plurality of engaging members, a lower fixing ring provided with a plurality of engaging seats, and a plurality of ribs each having a projection at an upper end thereof and two pins at a lower end thereof, the ribs being detachably connected between the engaging members of the upper fixing ring and the engaging seats of the lower fixing rings, whereby when in disassembly, upper ends of the ribs are detached from the upper fixing ring enable the upper fixing ring and the ribs to collapse on the lower fixing ring thereby facilitating its transporting, and making it easier for packaging purposes.

Abstract: Foldable lampshade frame structure which can be folded to minimize the volume of the lampshade. The lampshade frame structure is covered by a soft lampshade sheet. The frame structure includes a circular upper tray, a circular lower tray and several foldable ribs riveted on circumferences of the upper and lower trays. Each foldable rib is provided with a foldable and movable pivot head near middle portion of the rib, whereby the lampshade frame structure is easily foldable to minimize the volume of the lampshade without affecting the rigidity thereof. Accordingly, the occupied space is greatly reduced so that the transfer and storage of the lampshades are facilitated.

Abstract: A lampshade adapted to be interconvertible between an assembled configuration having a first volume and a knockdown configuration having a second, smaller volume comprises lampshade segments connected to rotational elements. Slotting means on preselected rotational elements position the connecting members to assume predetermined positions with respect to the common axis, where the rotational elements are locked in place. Methods for use of the lampshade in knockdown shipping, and kits containing the lampshade and instructional materials are also taught.

Abstract: A lampshade assembly comprises a lampshade and a connection mechanism. The lampshade has a plurality of lampshade pieces. The connection mechanism has a plurality of connecting rods each of which is respectively attached to the lampshade pieces. The connection mechanism further comprises an upper cap, a first fitting piece, a fitting set and a spring. When the spring is stretched outwardly to separate the upper cap from the first fitting piece and then stack the lampshade pieces. When the lampshade pieces are assembled, the connecting rods radiate around a circle. Since the space occupied by the lampshade assembly is reduced, the packing cost and the transport cost are reduced.

Abstract: A portable outdoor lighting fixture which includes a base with a post extending vertically therefrom with a telescoping tube therein with a compression nut to lock the tube at the desired height, with a flexible arm connecting the tube to a switchable shade assembly, and a low voltage transformer connected to a source of electrical energy and to a supply wire connected to a terminal block on the underside of the base of the fixture, and a wire connecting the terminal block to a switchable shade assembly.

Abstract: A releasable attachment for a support rod of a lightbank assembly includes a rod anchor block that has at least one hole for receiving and retaining a proximal end of a support rod and is pivotally mounted in relation to a frame, such as a typical ring-shaped frame of the light bank assembly. A releasable latch mechanism, such as a pivotal lever or a slidable pin, with a latch surface engages a latch surface on or in the rod anchor block to releasably latch the rod anchor block against pivotal movement in relation to the frame, when the support rod and a reflector hood and diffuser panel mounted on the support rod, are extended to their outstretched, use configuration.

Abstract: An extendible assembly-type lamp shade structure having a top ring and a bottom ring both having appropriately situated open ends, frame members sequentially arrayed for propping between the top ring and the bottom ring, and a lamp shade fabric surfacing. The plurality of frame members each have punch formed at their bottom ends a catch section with a through-hole to provide for sleeving onto the bottom ring and, furthermore, the bottom ring has a fixing ring ensleeved at each of the two sides of the frame members that position the frame members. The top ring has sleeved onto it fixing mounts situated for each frame member that provide for the positioning of the frame members. The lamp shade fabric surfacing is positioned by the insertion of the frame members; through-holes are first made to provide for the insertion of the frame members extending from the upper aspect of the fixing mounts on the top ring and all are extended to the exterior side of the lamp shade fabric surfacing.

Abstract: A folding structure of a two-layer lampshade is disclosed. The folding structure has a top ring at a topmost of the lampshade, a bottom ring having a diameter larger than that of the top ring, and a supporting frame between the top ring and the bottom ring. A plurality of supporting rods extend from a ring edge of the top ring toward a center of the top ring. The supporting frame is formed by a plurality of longitudinal rods and a plurality of transversal rods. Since the supporting frame is engaged to the bottom ring by the buckle, it can rotate to be positioned horizontally by using the buckles as fulcrums and the inner cloth and outer cloth of the lampshade encloses the folding structure. Thereby, the lampshade is assembled to have a smaller volume, As a consequence, the transfer cost is reduced.

Abstract: A lamp shade assembly includes a foldable shade having an upper edge and a lower edge to define an inner cavity therebetween, a top frame mounted at the upper edge of the foldable shade, a bottom frame mounted at the lower edge of the foldable shade, and a supporting frame detachably mounted between the top frame and the bottom frame within the inner cavity of the foldable shade for applying a stretching force on the foldable shade. The stretching force of the supporting frame is greater than a weight of the foldable shade, so that the foldable shade is stretched to provide a tension surface extending between the upper edge and the lower edge thereof, so as to form a collapsible lamp shade which is facilitated to be disassembled into a compact unit for storage and carriage and quickly assembled to tensely support a foldable shade.

Abstract: Lampshade frame structure including an outer shade body, an upper and a lower trays and several support rods. The upper tray is made of metal rod having circular cross-section. The lower tray is made of metal rod having rectangular cross-section. The support rod is made of slightly elastic elongated metal strip. Each of two ends of the support rod is enclosed in a fixing sheath. One end of an upper fixing sheath is formed with a semicircular holding section, while one end of a lower fixing sheath is formed with a hooking section for respectively hooking and connecting with the upper and lower trays.

Abstract: A lampshade includes a collapsible frame to which a flexible cover is attached. The frame includes an upper ring and a lower ring. A plurality of support bars are arranged between the upper and lower rings. Each support bar includes an upper section and a lower section hinged to each other. The upper section of the support bar has an end hinged to the upper ring. The lower section of the support bar has an end hinged to the lower ring. The hinge connections between the upper and lower sections of the support bar and between the support bar and the upper and lower rings allow the frame to collapse without separating the parts from each other. A channel member is partially fixed to the upper section of the support bar for partially receiving the lower section of the support bar. Dimples are defined in the lower section of the support for engaging with bosses formed on the channel member for maintaining the support bar in an extended condition.

Abstract: A collapsible lamp shade is provided, having removable supports to engage an upper ring and lower ring assembly in an interference fit.

Abstract: A lampshade has a frame and a shade. The frame has an upper collar, a lower collar and multiple supporting frames. The upper collar is attached to the stand of the lamp. The supporting frames are detachably mounted between the upper collar and the lower collar. Each supporting frame has an upper section, two side rods and a lower section. The lower section is connected to the side rods at the end far away from the upper section. The lower section abuts against the top of the lower collar. Such a lampshade can be disassembled into multiple parts whereby it is detachable to reduce the lampshade in size. Thus, to store and to transport the lampshade are convenient.

Abstract: A structure of a foldable lampshade is disclosed. The foldable lampshade comprises an upper and a lower securing ring, an outer shade for connecting the upper and the lower securing ring, and one or more supporting frame, characterized in that the supporting frame is detachable and/or mountable with the securing rings such that the outer shade can be folded or stacked to a minimum size. A connection end of the upper securing ring is provided with a snap slot for connection with the snap plate provided on the upper securing ring. One end of the supporting frame is mounted to the lower securing ring.

Abstract: A folding structure of a two-layer lampshade is disclosed. The folding structure has a top ring at a topmost of the lampshade, a bottom ring having a diameter larger than that of the top ring, and a supporting frame between the top ring and the bottom ring. A plurality of supporting rods extend from a ring edge of the top ring toward a center of the top ring. The supporting frame is formed by a plurality of longitudinal rods and a plurality of transversal rods. Since the supporting frame is engaged to the bottom ring by the buckle, it can rotate to be positioned horizontally by using the buckles as fulcrums and the inner cloth and outer cloth of the lampshade encloses the folding structure. Thereby, the lampshade is assembled to have a smaller volume, As a consequence, the transfer cost is reduced.

Abstract: A lampshade has a frame and a shade. The frame has an upper collar, a lower collar and multiple supporting frames. The upper collar is attached to the stand of the lamp. The supporting frames are detachably mounted between the upper collar and the lower collar. Each supporting frame has an upper section, two side rods and a lower section. The lower section is connected to the side rods at the end far away from the upper section. The lower section abuts against the top of the lower collar. Such a lampshade can be disassembled into multiple parts whereby it is detachable to reduce the lampshade in size. Thus, to store and to transport the lampshade are convenient.

Abstract: A foldable lampshade has an upper ring and a lower ring. A plurality of ribs is pivotally mounted between the upper ring and the lower ring. Each rib has an upper arm and a lower arm pivotally mounted together by a pin. A notch is defined at an inner side of the lower arm and near an upper end of the lower arm. A pole is formed near a lower end of the upper arm and located in the notch. A resilient member has a first end secured on the upper arm and a second end secured on the lower arm. A shade covers the upper ring, the lower ring and the ribs.

Abstract: The invention is a collapsible lampshade that helps conserve shipping and storage volume. Current invention consists of a rigid upper structures, a rigid lower structure, a flexible fabric joining the rigid upper structure and rigid lower structure, supported by several trapezoidal frames after the lampshade is assembled. Using trapezoidal frames to prop up the fabric, and hence completing the assembly process is easier and faster than other means of propping up and support the tension created by the fabric joining the rigid structures.

Abstract: Lamp shade structure comprising a shade body and a frame body. The shade body is integrally made of fabric material and has a conic shape. Two ends of the shade body are respectively provided with a fixed fitting section and an extensible fitting section inbuilt with an elastic belt. The fitting sections are respectively snugly fitted around upper and lower edges of the frame body so that the shade body entirely encloses the frame body therein. The frame body is composed of multiple metal rods having predetermined pattern and connected with each other by latch members by way of clamping. A tray body is disposed on upper opening of the frame body to serve as a holder for bulb seat. All the metal rods of the frame body can be freely assembled and disassembled. After disassembled, the total volume of the frame body is greatly reduced to facilitate storage and transfer and lower the cost for transfer.

Abstract: Knockdown lampshade structure including a frame body, a shade body and a circular frame. The frame body is embraced with multiple arch metal frames handed in glove by multiple joints. The lamp stand is attached to the arch metal frame to stabilize lamp base and light bulb. The shade body is in fan-shaded rolled into conic shape which is made of soft fabric outside and hard paper material inside. The hooks are integrally sewn to the shade body across the top and bottom end where embedded with the circular frame and metal frames. The clips are spreading evenly across the shade body edge to embrace the shade body hence from the conic shape. The circular frame is made from metal, embedded with the hooks on the top end to support the shade body. The lampshade can be minimized to facilitate storage and transfer of large amount of products, hence minimize the occupied space and cut down the overheads.

Abstract: An improved structure storable lamp shade comprised of a top ring, a bottom ring, frame members pivotably conjoined between the top ring and the bottom ring, and a fabric surfacing. A beveled bottoming segment at the point of confluence between the upper support rods and the lower support rods provides for the appropriate posturing of the upper and lower support rods and prevents the slipping of the dual-rod frame members, while also facilitating the disengagement of the upper support rods and the lower support rods. A catch section projects from the bottom outer end of the upper support rod and a lock section is disposed at the bottom surface of the lower support rod and, furthermore, the catch sections are held in place by the lock sections, thereby preventing the unintentional disengagement of the dual-rod frame members.

Abstract: There is provided a lampshade frame that shifts between an erect, use configuration and a collapsed configuration for shipping, packaging and/or storage. The frame includes an upper hoop and a lower hoop with segmented ribs extending between the hoops. Each of the segmented ribs includes at least two segments that are interconnected by a sleeve that allows them to shift between an extended position, where the length of the rib is maximized for erecting the lampshade, and a retraced state, where the length of the rib is shortened for collapsing the lampshade. The sleeve also locks the ribs in the extended state against unintentional collapse of the lampshade frame.

Abstract: An improved rapid assembly/disassembly lamp shade including a top ring, a bottom ring of larger circumference than the top ring, and frame members propped between the top ring and the bottom ring. The top horizontally bowed rod section of each frame member has a laterally projecting tenon such that after the frame members are assembled, the tenons maintain the top horizontally bowed rod sections against the bottom edge of the top ring. Fastening sections having insertive holes are punch molded at bottom ends of the frame members. The fastening sections are placed through the open end of the bottom ring and coupled onto the bottom ring. A series of sequentially arrayed locating slots disposed on the bottom ring in alignment with frame member positions restrict the movement of the frame members.

Abstract: An improved structure rapid assembly/disassembly lamp shade comprised of a top ring at the uppermost end of a lamp shade, a bottom ring of larger circumference than the top ring, and frame members propped between the top ring and the bottom ring. The top horizontally bowed rod section of each frame member has a laterally projecting tenon such that after the frame members are assembled, the tenons maintain the top horizontally bowed rod sections against the bottom edge of the top ring. Fastening sections having insertive holes are continuously punch molded at the bottom ends of the frame members and, furthermore, the fastening sections are placed through the open end of the bottom ring and coupled onto the bottom ring. A series of sequentially arrayed locating slots disposed on the bottom ring in alignment with frame member positions restrict the movement of the frame members. The lamp shade fabric is attached to the outermost sides and envelops the top and bottom ring as well as the frame members.

Abstract: A selectively collapsible lamp shade in which the shade is extended between upper and lower rings, the rings being held apart by a series of struts which are transverse to and engage the rings in a series of equidistant supports about the perimeter of the shade. The struts are pre formed to define the shape of the shade and inhibit improper installation of the struts.

Abstract: An improved structure for a separable lamp cover having a top ring on the very top of the lamp cover, a bottom ring equipping an opening on the appropriate location, and support frames connecting the top ring and the bottom ring. Near the support portion of a support frame, there are radially extending support bars with clip hooks. After the assembly of the support frames, the upper transversal arch bars engage the clip hooks. The bottom of the support frame has clip elements with pierced holes through which is inserted on the bottom ring. On both sides of the support frame, the bottom ring has punched convex stoppers to constrain the movement of the support.

Abstract: Assembling buckle structure for knockdown lamp shade, including assembling buckles, shade bodies and a tray body. The assembling buckles include upper buckles and lower buckles for connecting upper and lower sides of two shade body. Each assembling buckle having a main body formed with two symmetrical arched hook sections. The main body of the upper buckle is further formed with a C-shaped socket on rear side. The assembling buckles connect the shade bodies with each other. The tray body has multiple links inserted in the sockets of the assembling buckles to reinforce the entire structure and form a hollow lamp shade for receiving a bulb seat therein. The assemblies buckles are detachably assembled with the shade bodies, whereby the volume of the lamp shade can be minimized without affecting the rigidity thereof and the transferring and storage of the lamp shades can be facilitated.

Abstract: A lamp cover structure for easy assembly having a top ring with radial support bars, a bottom ring, of which the perimeter is greater than that of the top ring, and a support frame connecting the top ring and the bottom ring. Ends of the support bars are folded inward to form clip hooks. Upper transversal arch bars of the support frame have concave clip grooves bent downward to engage the clip hooks. The bottom ring has inwardly inclined support bars engaged by the support frame to constrain movement of the support frame.