Patent Publication Number: US-7716892-B2

Title: Ceiling panel system

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention is directed to a ceiling panel system and, more specifically, to a ceiling panel system that can give a three-dimensional look to a plurality of ceiling panels arranged in a lattice pattern on an arbitrary horizontal plane. 
   2. Related prior Art 
   In an effort to conceal cables, ducts, pipes and so forth, an access ceiling is installed under the roof of an office building, a subway station building, a factory building or the like. The access ceiling is completed by a wide variety of finishes such as ceiling panels or boards. For firm installation of the ceiling panels, they should be fixedly secured to an upper structural body by tightening screws or bolts or welding. However, the task of installing the ceiling panels by such a tightening or welding operation requires a great deal of manpower and time and therefore is unsuitable for application to an access ceiling of a subway station building in which maintenance or repair for a piping and a wiring has to be performed from time to time. 
   A great number of prior art references, including U.S. pat. Nos. 5,603,193, 6,205,733 and 6,230,463, disclose techniques for installing a plurality of ceiling panels to a ceiling structural body on an arbitrary horizontal plane. As disclosed in these references, a plurality of grids are attached to the ceiling structural body and rectangular ceiling panels are secured to the grids in the form of cross stripes. The prior art ceiling panel systems noted above pose a problem in that they suffer from significant reduction in an ornamental effect, because the rectangular ceiling panels are monotonously arranged in a lattice pattern on the arbitrary horizontal plane. 
   In the meantime, the ceiling panels are made of varying kinds of materials such as wooden plates, veneer boards, gypsum boards, metal plates or the like. In view of the fact that vibration and impulse act continuously on the ceiling panels of a subway station building or a factory building, the ceiling panel materials should exhibit rigidity, wear resistance and anti-corrosion property great enough to resist the vibration and impulse. Thus, metal plates have been mainly used as the ceiling panels for that purpose. Although the ceiling panels made of metal plates are produced by a sheet metal working, the intrinsic features of the sheet metal working make it quite difficult to form the ceiling panels into diversified shapes. 
   SUMMARY OF THE INVENTION 
   Taking into account the above and other problems inherent in the prior art, it is an object of the present invention to provide a ceiling panel system that, while arranging a plurality of ceiling panels in a lattice pattern on an arbitrary horizontal plane, can give a three-dimensional look to the ceiling panels and can improve an ornamental effect thereof. 
   Another object of the present invention is to provide a ceiling panel system capable of giving a variety of three-dimensional looks to individual ceiling panels. 
   A further object of the present invention is to provide a ceiling panel system that has a simplified structure and is easy to install. 
   With these objects in view, the present invention provides a ceiling panel system, comprising: a ceiling panel lying on an arbitrary horizontal plane and including a rectangular face portion with four corner areas and a skirt portion extending rearward from a peripheral edge of the face portion, the face portion having at least one main decoration hole with a peripheral edge from which a main flange portion extends rearward, the corner areas of the face portion having first to fourth subordinate decoration holes with peripheral edges from which first to fourth subordinate flange portions extend rearward; a main decoration object fitted to the main decoration hole in such a manner as to protrude from the face portion of the ceiling panel, the main decoration object including a face portion and a skirt portion extending rearward from a peripheral edge of the face portion of the main decoration object; subordinate decoration objects fitted to the subordinate decoration holes in such a manner as to protrude from the face portion of the ceiling panel, each of the subordinate decoration objects including a face portion and a skirt portion extending rearward from a peripheral edge of the face portion of each of the subordinate decoration objects; and a fixing means for joining together the main flange portion and the skirt portion of the main decoration object and for joining together the first to fourth subordinate flange portions and the skirt portions of the subordinate decoration objects. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The above and other objects, features and advantages of the present invention will become apparent from the following description of preferred embodiments given in conjunction with the accompanying drawings, in which: 
       FIG. 1  is a perspective view showing the overall configuration of a ceiling panel system in accordance with the present invention; 
       FIG. 2  is a partial cross-sectional view illustrating the configuration of ceiling panels and a frame employed in the ceiling panel system of the present invention; 
       FIG. 3  is a partially enlarged cross-sectional view depicting the combined configuration of ceiling panels, main decoration objects, clips and clip bars employed in the ceiling panel system of the present invention; 
       FIG. 4  is a perspective view showing the configuration of ceiling panels, main decoration objects, subordinate decoration objects and clips employed in the ceiling panel system of the present invention; 
       FIG. 5  is a cross-sectional view taken along line V-V in  FIG. 4 ; 
       FIG. 6  is a plan view illustrating one exemplary configuration of four ceiling panels of the inventive ceiling panel system arranged adjacent to one another; 
       FIG. 7  is a bottom view illustrating one exemplary configuration of four ceiling panels of the inventive ceiling panel system arranged adjacent to one another; 
       FIG. 8  is a top perspective view showing the configuration of a ceiling panel employed in the ceiling panel system of the present invention; 
       FIG. 9  is a bottom perspective view showing the configuration of a ceiling panel employed in the ceiling panel system of the present invention; 
       FIG. 10  is a perspective view showing the configuration of an decoration object employed in the ceiling panel system of the present invention; 
       FIG. 11  is a partially enlarged cross-sectional view depicting the configuration of ceiling panels, subordinate decoration objects and clips employed in the ceiling panel system of the present invention; 
       FIG. 12  is a partial cross-sectional view illustrating a main decoration object affixed to ceiling panels by means of a spring plate in the ceiling panel system of the present invention; and 
       FIG. 13  is a partial cross-sectional view illustrating a subordinate decoration object affixed to ceiling panels by means of a spring plate in the ceiling panel system of the present invention 
   

   DETAIL DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   One preferred embodiment of a ceiling panel system according to the present invention will now be described in detail with reference to the accompanying drawings. 
   Referring first to  FIGS. 1 through 9 , a ceiling panel system of the present invention includes a plurality of ceiling panels  10  attached to a roof of an office building, a subway station building, a factory building or the like in a mutually adjoining relationship to provide an access ceiling installation for example, each of the ceiling panels  10  arranged in a lattice pattern on an arbitrary horizontal plane. The ceiling panels  10  are produced by sheet-metal-working metal plates. Each of the ceiling panels  10  is comprised of a rectangular face portion  14  with four corner areas  12  and a skirt portion  16  extending rearward from the peripheral edge of the face portion  14 . 
   As shown in  FIGS. 6 through 9 , one or more main decoration holes  18  are formed in the face portion  14  of each of the ceiling panels  10  and a main flange portion  20  protrudes rearward from the peripheral edge of each of the main decoration holes  18 . Although four main decoration holes  18  are formed in all directions about the center of the face portion  14  in  FIGS. 8 and 9 , the number and position of the main decoration holes  18  may be properly increased or decreased if necessary. Only one main decoration hole may be formed at the center of the face portion  14 . While each of the main decoration holes  18  of the ceiling panels  10  is shown to have an octagonal shape in  FIGS. 8 and 9 , this is for the illustrative purpose only and, therefore, each of the main decoration holes  18  may be changed to many other shapes, e.g., a circle, an ellipse, a triangle, a rectangle, a pentagon and a hexagon. 
   As illustrated in  FIGS. 6 ,  8  and  9 , first to fourth subordinate decoration holes  22   a - 22   d  are formed at the respective corner areas  12  of the face portion  14  of the ceiling panels  10 , and fifth to eighth subordinate decoration holes  22   e - 22   h  are formed at the middle of each of the side edges of the face portion  14 . First to eighth subordinate flange portions  24   a - 24   h  extend rearward respectively from one side edge of the first to eighth subordinate decoration holes  22   a - 22   h . In  FIGS. 8 and 9 , the first to eighth subordinate decoration holes  22   a - 22   h  are shown to have a triangular shape. If four of the ceiling panels  10  are positioned adjacent to one another, each of the first to fourth subordinate decoration holes  22   a - 22   d  of the four ceiling panels  10  forms a rectangle in cooperation with the ones of the neighboring subordinate decoration holes as viewed from the bottom. If two of the ceiling panels  10  are positioned adjacent to each other, each of the fifth to eighth subordinate decoration holes  22   e - 22   h  of the two ceiling panels  10  forms a rectangle in cooperation with the one of the neighboring subordinate decoration holes as viewed from the bottom. The fifth to eighth subordinate decoration holes  22   e - 22   h  may be changed in shape to a semi-circle, a semi-ellipse, a semi-pentagon, a semi-hexagon, a semi-octagon and so forth. 
   Provided at the center of the face portion  14  of the respective ceiling panels  10  is a ninth subordinate decoration hole  22   i , from the peripheral edge of which a ninth subordinate flange portion  24   i  extends rearward. While the ninth subordinate decoration hole  22   i  is shown to have a rectangular shape in  FIGS. 8 and 9 , this is for the illustrative purpose only and, therefore, the ninth subordinate decoration hole  22   i  may be changed to many other shapes, e.g., a circle, an ellipse, a triangle, a rectangle, a pentagon and a hexagon. 
   Referring to  FIGS. 2-6 ,  8  and  9 , a cutout  26  is formed at each of the four corner areas of the skirt portion  16  and a pair of slits  28   a  and  28   b  are formed at the skirt portion  16  in such a manner as to lead to the opposite ends of each of the first to eighth subordinate decoration holes  22   a - 22   h . A plurality of protrusions  30  are formed on the inner surface of the skirt portion  16 , which protrusions  30  may be created by embossing the skirt portion  16 . A plurality of coupling holes  32  are formed on the main flange portion  20  and one or more coupling holes  34  are formed on each of the first to ninth subordinate flange portions  24   a - 24   i.    
   Referring to  FIGS. 1 through 7 , main decoration objects  40  are attached to the main decoration holes  18  of the ceiling panels  10  in such a manner as to protrude forward from the face portion  14 . The main decoration objects  40  are produced by sheet-metal-working metal plates just like the ceiling panels  10  or by injection-molding synthetic resin materials. Each of the main decoration objects  40  is comprised of a face portion  42  having the same shape as that of the main decoration holes  18  of the ceiling panels  10  and a skirt portion  44  extending rearward from the peripheral edge of the face portion  42 . A plurality of protrusions  46  are formed on the inner surface of the skirt portion  44 , which protrusions  46  may be created by embossing the skirt portion  44 . As the protrusions  46  are embossed in this manner, a plurality of coupling grooves  48  are left on the outer surface of the skirt portion  44 . 
   Referring to  FIGS. 1 ,  4 - 7 ,  10  and  11 , subordinate decoration objects  50  are attached to the first to ninth subordinate decoration holes  22   a - 22   i  of the ceiling panels  10 . The subordinate decoration objects  50  are produced by sheet-metal-working metal plates just like the ceiling panels  10  and the main decoration objects  40  or by injection-molding synthetic resin materials. Each of the subordinate decoration objects  50  is comprised of a face portion  52  and a skirt portion  54  extending rearward from the peripheral edge of the face portion  52 . A plurality of protrusions  56  are formed on the inner surface of the skirt portion  54 , which protrusions  56  may be created by embossing the skirt portion  54 . As the protrusions  56  are embossed in this manner, a plurality of coupling grooves  58  are left on the outer surface of the skirt portion  54 . 
   At the top ends of the corner areas of the skirt portion  54 , four cutouts  60  are formed in alignment with the slits  28   a  and  28   b  of the ceiling panels  10 . By aligning two of the four cutouts  60  of the subordinate decoration objects  50  with the slits  28   a  and  28   b  of the ceiling panels  10 , the subordinate decoration objects  50  are fitted to the first to eighth subordinate decoration holes  22   a - 22   h  in such a manner that the skirt portions  54  of the subordinate decoration objects  50  can be overlapped with the first to eighth subordinate flange portions  24   a - 24   h  of the ceiling panels  10 . 
   Referring to  FIGS. 1-6 ,  10  and  11 , the ceiling panel system of the present invention includes a plurality of clips  70  as a means for coupling together the main flange portions  20  of the ceiling panels  10  and the skirt portion  44  of the main decoration objects  40  and for coupling together the first to ninth subordinate flange portions  24   a - 24   i  of the ceiling panels  10  and the skirt portion  54  of the subordinate decoration objects  50 . Each of the clips  70  has a first elastic piece portion  72  and a second elastic piece portion  74  which are spaced apart by a predetermined distance and exhibit elasticity. The top ends of the first elastic piece portion  72  and the second elastic piece portion  74  are connected by means of a connector piece portion  76 . Formed on the inner surface of the first elastic piece portion  72  is an engaging piece portion  78  insertedly fitted to each of the coupling holes  32  of the main flange portions  20  and each of the coupling holes  34  of the first to ninth subordinate flange portions  24   a - 24   i . An engaging groove  80  is formed on the inner surface of the second elastic piece portion  74 . 
   Referring to  FIGS. 1-3 , the ceiling panel system of the present invention includes a frame  100  on which the ceiling panels  10  are installed. The frame  100  is comprised of a plurality of clip bars  110 , a plurality of carrying channels  120 , a plurality of joint clips  130 , a plurality of hangers  140  and a plurality of anchor bolts  150 . 
   The clip bars  110  are arranged above the ceiling panels  10  in a mutually parallel relationship so that the skirt portions  16  of two neighboring ceiling panels  10  can be affixed to the clip bars  110 . Each of the clip bars  110  is comprised of a pair of elastic plate portions  112  and  114  having elasticity and pressed against each other so that the skirt portions  16  of the two ceiling panels  10  can be sandwichedly secured between the elastic plate portions  112  and  114 , and a connector plate portion  116  adapted to interconnect the top ends of the elastic plate portions  112  and  114 . A pair of lugs  118  are formed on the opposite sides of the connector plate portion  116 . 
   The carrying channels  120  are provided on the clip bars  110  in a mutually parallel relationship in such a manner as to intersect the clip bars  110 . The clip bars  110  and the carrying channels  120  are secured to each other by the joint clips  130 . Each of the joint clips  130  is provided at its bottom opposite sides with a pair of hooks  132  and fastened to the carrying channels  120  by means of a screw  134 . The lugs  118  of the clip bars  110  are engaged with the hooks  132  of the joint clips  130 . 
   The hangers  140  are attached to the carrying channels  120  and threadedly coupled to the anchor bolts  150  which in turn are fastened to a ceiling structural body  160 , e.g., a concrete slab. If needed, the anchor bolts  150  may be replaced with an anchor wire fixedly secured to the ceiling structural body  160 . Instead of using the anchor bolt or the anchor wire, the carrying channels  120  may be directly fastened to the ceiling structural body  160  by means of bolting, welding or other means. 
   Description will now be given to the operation of the inventive ceiling panel system having the configuration as set forth above. 
   Referring to  FIGS. 1 through 3 , in order for a worker to install the ceiling panels  10 , the anchor bolts  150  are fastened to the ceiling structural objects  160  and the hangers  140  are secured to the anchor bolts  150 . The carrying channels  120  are hung on the hangers  140  and the joint clips  130  are affixed to the carrying channels  120  by tightening the screw  134 . The clip bars  110  are attached to the carrying channels  120  in a mutually intersecting relationship by bringing the lugs  118  of the clip bars  110  into engagement with the hooks  132  of the joint clips  130 . 
   Referring to  FIGS. 2 through 5 , the main decoration objects  40  are insertedly fitted to the main decoration holes  18  of the ceiling panels  10  in such a manner that the main decoration objects  40  protrude forward from the face portion  14 . The top ends of the skirt portions  44  are aligned with the top ends of the main flange portions  20  and then the clips  70  are affixed to the main flange portions  20  and the skirt portions  44  from above the ceiling panels  10 . Once the main flange portions  20  and the skirt portions  44  are sandwichedly fitted between the first elastic piece portion  72  and the second elastic piece portion  74  of each of the clips  70 , the first elastic piece portion  72  and the second elastic piece portion  74  are resiliently biased toward each other to firmly hold the main flange portions  20  and the skirt portions  44  in place. The engaging piece portion  78  of the first elastic piece portion  72  is inserted into the coupling groove  48  through the coupling hole  32 , and the protrusions  46  are inserted into the engaging grooves  80  of the second elastic piece portion  74 . Thus, the clips  70  firmly hold in place the main decoration objects  40  that are insertedly fitted to the main decoration holes  18  of the ceiling panels  10 . Alternatively, the main decoration objects  40  may be secured to the main decoration holes  18  of the ceiling panels  10  by means of a fastener means such as spot welding, bolting, riveting or the like. 
   Referring to  FIG. 11 , the subordinate decoration object  50  is fitted into the ninth subordinate decoration hole  22   i  of each of the ceiling panels  10  in such a fashion as to protrude forward from the face portion  14 . The top end of the skirt portion  54  is aligned with the top end of the ninth subordinate flange portion  24   i  and then the clips  70  are affixed to the ninth subordinate flange portion  24   i  and the skirt portion  54  from above the ceiling panels  10 . Once the ninth subordinate flange portion  24   i  and the skirt portion  54  are sandwichedly fitted between the first elastic piece portion  72  and the second elastic piece portion  74  of each of the clips  70 , the first elastic piece portion  72  and the second elastic piece portion  74  are resiliently biased toward each other to firmly hold the ninth subordinate flange portion  24   i  and the skirt portion  54  in place. The engaging piece portion  78  of the first elastic piece portion  72  is inserted into the coupling groove  58  through the coupling hole  34 , and the protrusions  56  are inserted into the engaging grooves  80  of the second elastic piece portion  74 . Thus, the clips  70  firmly hold in place the subordinate decoration object  50  that are insertedly fitted to the ninth subordinate decoration hole  22   i  of the ceiling panels  10 . 
   Referring to  FIGS. 2 and 3 , the skirt portions  16  of two ceiling panels  10  are overlapped side by side and inserted into between the elastic plate portions  112  and  114  of each of the clip bars  110 . As the skirt portions  16  of the two ceiling panels  10  are inserted into between the elastic plate portions  112  and  114  of each of the clip bars  110 , the elastic plate portions  112  and  114  are spread apart in the opposite directions to facilitate entry of the overlapped skirt portions  16 . Once the protrusions  30  of the skirt portions  16  are inserted through between the elastic plate portions  112  and  114 , the distal ends of the elastic plate portions  112  and  114  are resiliently pressed toward each other to firmly hold the skirt portions  16  against removal. At this time, the clip bars  110  are placed at the cutouts  26  of the ceiling panels  10 . In this way, the skirt portions  16  of the two ceiling panels  10  are affixed to the clip bars  110  to thereby install the ceiling panels  10  on an arbitrary horizontal plane such that they can be continuously arranged in the front-rear direction and in the left-right direction. 
   As illustrated in  FIGS. 6 and 7 , the subordinate decoration objects  50  are commonly fitted to the first to fourth subordinate decoration holes  22   a - 22   d  of four adjoining ceiling panels  10 . Referring to  FIGS. 4 ,  8  and  10 , in the process of inserting the subordinate decoration objects  50  into the first to fourth subordinate decoration holes  22   a - 22   d , the cutouts  60  of the subordinate decoration objects  50  are aligned with the slits  28   a  and  28   b  of the ceiling panels  10  and the top end of the skirt portion  54  is flush with the top end of the first to fourth subordinate flange portions  24   a - 24   d . Just like the ninth subordinate flange portion  24   i  and the skirt portion  54  set forth earlier, the first to fourth subordinate flange portions  24   a - 24   d  and the skirt portions  54  are insertedly fitted between the first and second elastic piece portions  72  and  74  of the clips  72 . Alternatively, the subordinate decoration objects  50  may be secured to the first to ninth subordinate decoration holes  22   a - 22   i  of the ceiling panels  10  by means of a fastener means such as spot welding, bolting, riveting or the like. 
   As depicted in  FIGS. 1 ,  6  and  7 , the subordinate decoration objects  50  are commonly fitted to the fifth to eighth subordinate decoration holes  22   e - 22   h  of two adjoining ceiling panels  10 . Referring to  FIGS. 4 ,  8  and  10 , in the process of inserting the subordinate decoration objects  50  into the fifth to eighth subordinate decoration holes  22   e - 22   h , the cutouts  60  of the subordinate decoration objects  50  are aligned with the slits  28   a  and  28   b  of the ceiling panels  10  and the top end of the skirt portion  54  is flush with the top end of the fifth to eighth subordinate flange portions  24   e - 24   h . The fifth to eighth subordinate flange portions  24   e - 24   h  and the skirt portions  54  are insertedly fitted between the first and second elastic piece portions  72  and  74  of the clips  72 . 
   According to the forgoing arrangement wherein the ceiling panels  10  are attached to the carrying channels  120  of the frame  100  in such a manner as to lie on and protrude from an arbitrary horizontal plane, the main decoration objects  40  are fitted to the ceiling panels  10  to protrude from the face portion  14  and the subordinate decoration objects  50  are fitted to the boundary of the ceiling panels  10 , the main decoration objects  40  and the subordinate decoration objects  50  protruding from the ceiling panels  10  can give a three-dimensional look to the ceiling panel system and can greatly improve ornamental effect offered by the ceiling panel system, while allowing the ceiling panels  10  to be arranged on an arbitrary horizontal plane in a lattice pattern. Furthermore, the main decoration objects  40  and the subordinate decoration objects  50  can be readily installed on the ceiling panels  10  using the clips  70 , which help to enhance the workability. 
     FIG. 12  illustrates one main decoration object affixed to ceiling panels by means of a spring plate, one of other examples of a fastener means, in the ceiling panel system of the present invention. Referring to  FIG. 12 , a plurality of spring plates  170  are attached to the inner top surfaces of the main flange portions  20  of the ceiling panels  10 . The top end portion of each of the spring plates  170  is fixed to the main flange portions  20  by means of rivets  172 . Alternatively, the top end portion of each of the spring plates  170  may be fixed to the main flange portions  20  by means of spot welding. Each of the spring plates  170  is bent such that a first coupling groove  174  into which the skirt portion  16  of each of the main decoration objects  40  is inserted can be formed between the inner surface of the respective main flange portions  20  and the inner surface of the respective spring plates  170 . Formed at the lower extension of each of the spring plates  170  is a second coupling groove  176  into which the protrusion  46  of each of the main decoration objects  40  is inserted. 
   If the skirt portion  44  of the main decoration object  40  is inserted into the main decoration hole  18  of each of the ceiling panels  10 , the top portion of the skirt portion  44  is fitted to the first coupling groove  174  between the inner surface of the respective main flange portions  20  and the inner surface of the respective spring plates  170 . The lower extensions of the spring plates  170  are elastically deformed and spaced apart from the inner surface of the respective main flange portions  20 , thus facilitating entry of the skirt portion  44 . If the protrusion  46  of the main decoration object  40  is inserted into the second coupling groove  176  of the respective spring plates  170 , each of the spring plates  170  is resiliently restored to ensure that the skirt portion  44  of the main decoration object  40  is pressed against the main flange portion  20  of each of the ceiling panels  10  and firmly held in place. 
   According to the above-noted arrangement wherein the spring plates  170  are attached to the main flange portions  20  of the ceiling panels  10  to thereby affix the main decoration objects  40  inserted into the main decoration holes  18  of the ceiling panels  10 , it is possible to attach the main decoration objects  40  more easily than in the case where the main flange portions  20  of the ceiling panels  10  are combined with the skirt portions  16  of the main decoration objects  40  by means of the clips  70 . 
   As shown in  FIG. 13 , the spring plates  170  are secured to the inner surfaces of the first to ninth subordinate flange portions  24   a - 24   i  of the ceiling panels  10 . The subordinate decoration objects  50  are insertedly fitted to the first to ninth subordinate decoration holes  22   a - 22   i  of the ceiling panels  10 . The skirt portion  54  of each of the subordinate decoration objects  50  is inserted into the first coupling groove  174  between the inner surface of each of the first to ninth subordinate flange portions  24   a - 24   i  and each of the spring plates  170 . The protrusion  56  of each of the subordinate decoration objects  50  is inserted into the second coupling groove  176  of each of the spring plates  170 . 
   While the invention has been shown and described in respect to one preferred embodiment, this is for the illustrative purpose only and is not intended to limit the scope of the invention by no means. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. 
   As described in the foregoing, the ceiling panel system of the present invention can give a three-dimensional look to ceiling panels and can improve an ornamental effect thereof, by attaching main decoration objects and subordinate decoration objects to the ceiling panels in such a manner as to protrude from face portions of the ceiling panels while arranging the ceiling panels in a lattice pattern on an arbitrary horizontal plane. Furthermore, the ceiling panel system is capable of giving a variety of three-dimensional looks to the individual ceiling panels by diversifying the shape of the main decoration objects and the subordinate decoration objects. In addition, the ceiling panel system has a simplified structure and is easy to install, thanks to the fact that the main decoration objects and the subordinate decoration objects are combined together by means of clips.