Patent Publication Number: US-11039686-B2

Title: Prefabricated shelf assembly

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a prefabricated shelf assembly. More particularly, the invention relates to a prefabricated shelf assembly, which enables a shelf to be conveniently and rapidly assembled, enables the assembled shelf to be firmly maintained, and allows an outer wall and a door to be assembled as a user desires, thus realizing a high-quality product, and allows the length of the shelf to be adjusted via an assembly kit or allows a plurality of shelves to be optionally arranged and then be assembled depending on an installation environment, and adopts a coupling method using a fitting protrusion and a fitting hole, so that the shelf may be re-assembled by separating only a support plate even when the assembly has been completed, and thereby the height of a storage part can be easily changed. 
     Description of the Related Art 
     For a shelf for storing articles, various technologies have been proposed to adjust the height of the shelf according to the size of the articles. 
     As the related art, Korean UM. Registration No. 20-0228609, Korean Patent No. 10-2009-0026588, and Korean Patent Application Publication No. 10-2005-0078911 have been proposed. 
     They suggest an angle coupling structure or means for adjusting the height of the shelf. However, they are problematic in that a bolt should be fastened using a tool to detach or attach the shelf, thus causing a worker inconvenience, and the shelf has difficulty bearing a high load due to the structure of a coupling protrusion for fixing the shelf, and its manufacture is complicated. 
     Particularly, according to the related art, the shelf is merely configured to store articles thereon, so that its utilization is poor. Further, in the case of connecting two or more shelves, the entire shape is fixed, so that many restrictions are imposed on an installation place, and the design of the assembled shelves is monotonous, which makes it impossible to create various designs. 
     Accordingly, the inventor(s) of the present invention have proposed a prefabricated shelf (Patent No. 10-1845802) in order to solve the problems. However, this shelf is problematic in that a coupling groove of a frame is exposed to the outside, so that all sides are open and consequently an appearance is poor. Therefore, there is a need for a prefabricated shelf that overcomes the drawback and achieves a high quality. 
     SUMMARY OF THE INVENTION 
     The present invention has been made in order to solve the above-mentioned problems in the prior art and an object of the present disclosure is to provide a prefabricated shelf assembly, which allows an outer-wall unit and a door unit to be assembled with a main body composed of a vertical frame and a horizontal frame, as a user desires, thus realizing a higher quality compared to the conventional prefabricated shelf. 
     Another object of the present disclosure is to provide a prefabricated shelf assembly, which includes an assembly kit having various brackets, thus allowing a user to arrange two or more main bodies depending on an installation environment, as the user desires, and enabling the shelf assembly to be stably fixed. 
     A further object of the present disclosure is to provide a prefabricated shelf assembly, which can change the vertical length of a vertical frame and allows a main body to be installed even at a corner when main bodies are perpendicularly arranged. 
     In order to achieve the objects of the present invention, the invention provides a prefabricated shelf assembly including: a main body including a vertical frame having a first support part, a second support part, and a plurality of fitting holes formed in the first and second support parts; and a horizontal frame including a connection part and a holding part, with fitting protrusions being provided on both sides of the connection part to be fitted into the fitting holes, wherein the vertical frame and the horizontal frame are coupled to define a plurality of storage parts of the main body; a support plate configured to be held on the holding part of the horizontal frame; an outer-wall unit provided on some or all of the storage parts, and including an outer wall provided on either or both of a side surface and a rear surface of each of the storage parts, and an outer-wall bracket coupled to the vertical frame to support a rear end of the outer wall; and a door unit provided on some or all of the storage parts, and including a rail provided on a front of the storage part, and a door coupled to slide along the rail and opening or closing the storage part. 
     As described above, a prefabricated shelf assembly according to the present invention includes a main body having a vertical frame and a horizontal frame to define a plurality of storage parts, an outer-wall unit assembled to cover either or both of a side surface and a rear surface of the storage part, and a door unit assembled to open or close a front of the storage part, so that the outer-wall unit and the door unit can be assembled with the storage part at a desired position, thus more perfectly satisfying a user&#39;s needs, and achieving a higher quality compared to the conventional shelf assembly. 
     Furthermore, as a fitting hole provided to connect the vertical frame with the horizontal frame is not exposed to the outside, a good appearance is guaranteed. 
     The vertical length of the main body can be changed via an assembly kit including various brackets and connectors. Moreover, in the case of arranging a plurality of main bodies, the main body may be arranged even at a corner and then may be firmly fixed using the assembly kit, thus consequently enhancing stability and versatility. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a perspective view showing a prefabricated shelf assembly according to the present invention; 
         FIGS. 2A and 2B  are detailed views showing a vertical frame according to the present invention; 
         FIG. 2C  is a view showing a process of assembling the vertical frame according to the present invention; 
         FIGS. 3A, 3B, and 3C  are detailed views showing a horizontal frame according to the present invention; 
         FIGS. 4A and 4B  are detailed views showing an upper rail according to the present invention; 
         FIGS. 4C and 4D  are detailed views showing a lower rail according to the present invention; 
         FIGS. 5A and 5B  are detailed views showing a door according to the present invention; 
         FIGS. 6A and 6B  are detailed views showing a bracket for an outer wall according to the present invention; 
         FIG. 6C  is a diagram implementing the bracket for the outer wall according to the present invention; 
         FIG. 7  is a detailed view showing a fixing clip for fixing a pillar frame according to the present invention; 
         FIGS. 8A and 8B  are detailed views showing a main body connection bracket according to the present invention; 
         FIG. 8C  is a diagram implementing the main body connection bracket according to the present invention; 
         FIGS. 9A, 9B, and 9C  are detailed views showing a corner connection bracket according to the present invention; 
         FIG. 9D  is a diagram implementing the corner connection bracket according to the present invention; 
         FIGS. 10A and 10B  are detailed views showing a grid-wall bracket for connecting a grid wall according to the present invention; 
         FIGS. 11A and 11B  are detailed views showing a fixing-rod bracket for connecting a fixing rod according to the present invention; and 
         FIG. 12  is a detailed view showing an extension bracket for extending the vertical frame according to the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 
     Since the present invention may be embodied in many different forms, aspects (or embodiments) of the invention will be described in detail herein. However, the invention should not be construed as limited to the embodiments set forth herein. Rather, all changes that fall within the bounds of the present invention, or the equivalence of the bounds are therefore intended to be embraced by the present invention. 
     The same reference numerals throughout the drawings, that is, the same reference numerals for the second digit or the first digit, or for the second digit, the first digit and a letter of the alphabet, denote elements having the same function. Unless otherwise specified, the elements denoted by the reference numerals are to be assumed to comply with the above-mentioned reference scheme. 
     In the drawings, the thicknesses of lines or the sizes of elements may be exaggerated or simplified to more clearly and conveniently illustrate the present invention, but the bounds of the present invention must not be interpreted as being limited thereto. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms “a”, “an”, and “the” are intended to include plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising”, or “includes” and/or “including” when used in this specification, specify the presence of stated features, numbers, steps, operations, elements, components, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and/or combinations thereof. 
     Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
     As shown in  FIG. 1 , a prefabricated shelf assembly A according to the present invention includes a main body  10  that defines a plurality of storage parts  11  through a plurality of vertical frames  12 , a plurality of horizontal frames  13 , and a support plate  14 , an outer-wall unit  20  that is provided on the storage part  11 , and a door unit  30 . The assembly includes an assembly kit K that has various brackets to be assembled and arranged in various shapes. The assembly kit K can be used as desired to increase the diversity of assembly, and can achieve a high-quality of product through the outer-wall unit  20  and the door unit  30 . 
     In the description of the present invention, the brackets have various shapes according to their intended use, so that the respective brackets will be described with reference to the accompanying drawings. Terms for the different brackets may be interchangeably used, but refer to different components with reference to the accompanying drawings. 
     For the convenience of description,  FIG. 1  shows an assembled state, and  FIGS. 2A to 12  partially show the shape and use of respective components. It is to be noted that respective components may be implemented by a user&#39;s choice. 
     Hereinafter, the respective components will be described in detail with reference to the accompanying drawings. 
     First, as shown in  FIGS. 2A, 2B, 2C, 3A, 3B, and 3C , the main body  10  of the present invention includes the vertical frame  12  that is composed of a first support part  121  and a second support part  122  each having a rectangular shape, and a plurality of fitting holes  16  formed in the first support part  121  and the second support part  122 , and the horizontal frame  13  that is composed of a connection part  131  and a holding part  133  each having a rectangular shape, and fitting protrusions  15  provided on both sides of the connection part  131  to be fitted into the corresponding fitting holes  16 , so that the horizontal frame  13  is coupled to the vertical frame  12  to define the plurality of storage parts  11 . The first support part  121  of the vertical frame  12  includes a 1-1-th support part  121   a  formed on the outside, and a 1-2-th support part  121   b  bent from the 1-1-th support part  121   a  and formed on the inside of the 1-1-th support part  121   a  to be spaced apart therefrom. The second support part  122  of the vertical frame  12  includes a 2-1-th support part  122   a  formed on the outside, and a 2-2-th support part  122   b  bent from the 2-1-th support part  122   a  and formed on the inside of the 2-1-th support part  122   a  to be spaced apart therefrom. The fitting holes  16  are formed only in the 1-2-th support part  121   b  and the 2-2-th support part  122   b.    
     The vertical frame  12  will be described in detail. 
     As shown in  FIGS. 2A and 2B , the vertical frame  12  is a frame that is made to have a predetermined length by bending the first support part  121  and the second support part  122  at right angles. The first support part  121  includes the 1-1-th support part  121   a  exposed to the outer surface, and the 1-2-th support part  121   b  bent from the 1-1-th support part  121   a  at 180 degrees and defining a first spacing groove  124   a  to be spaced apart from the 1-1-th support part  121   a  by a predetermined distance. 
     Similarly to the first support part  121 , the second support part  122  includes the 2-1-th support part  122   a  exposed to the outer surface, and the 2-2-th support part  122   b  bent from the 2-1-th support part  122   a  at 180 degrees and defining a second spacing groove  124   b  to be spaced apart from the 2-1-th support part  122   a  by a predetermined distance (hereinafter, the first spacing groove  124   a  and the second spacing groove  124   b  are collectively referred to as a ‘spacing groove  124 ’). 
     In addition, as the fitting holes  16  are formed in the 1-2-th support part  121   b  and the 2-2-th support part  122   b , and no holes are formed in the 1-1-th support part  121   a  and the 2-1-th support part  122   a , the fitting holes  16  are not exposed to the outer surface after the shelf is installed, thus providing a better appearance. 
     The spacing groove  124  is provided to define a space where parts of the fitting protrusions  15  passing through the fitting holes  16  may remain, when the fitting protrusions  15  that will be described later are fitted into the fitting holes  16 . The plurality of fitting holes  16  is formed at regular intervals to adjust the assembled height of the horizontal frame  13  when the horizontal frame  13  is assembled with the vertical frame  12 . One fitting hole  16  may be arranged in one row, or two or more fitting holes  16  may be arranged in multiple rows in a longitudinal direction. 
     Moreover, a frame cap  126  may be further provided to close the uppermost end or the lowermost end, when the vertical frame  12  is installed. As shown in  FIG. 2C , the frame cap  126  includes an ‘L’-shaped fitting part  126   a  that is fitted into the spacing groove  124  to prevent an end of the vertical frame  12  from being exposed to the outside. The frame cap  126  is preferably made of a soft material such as rubber or silicone rather than a hard material to prevent it from slipping when the frame cap is coupled to a lower portion of the vertical frame  12 , provide a good appearance, and prevent a user from being injured by an edge. 
       FIGS. 3A, 3B, and 3C  show the horizontal frame  13  included in the main body  10 . As mentioned above, the horizontal frame  13  includes the connection part  131  and the holding part  133  that is provided on an upper portion of the connection part  131  to be perpendicular thereto (although a rail forming part  311   c  bent downwards from the holding part  133  may be further provided, this is provided to perform the function of an upper rail  311  that will be described later and is not an essential component, and will be described in greater detail when the upper rail  311  is described below). 
     Furthermore, the fitting protrusions  15  are provided on both sides of the horizontal frame  13 . A plurality of fitting protrusions  15  may be provided in a vertical direction to be spaced apart from each other by a predetermined distance (the distance is equal to the vertical spacing distance between the fitting holes  16 ), or a single fitting protrusion may be provided. However, the plurality of fitting protrusions is provided to ensure stability when assembled. If the fitting holes  16  are arranged in multiple rows, the plurality of fitting protrusions  15  is preferably arranged in multiple rows to correspond to the fitting holes  16 . 
     A sub-fitting hole  135  having the same shape as that of the fitting hole  16  is further formed in a center of the horizontal frame  13 . The sub-fitting hole  135  is used to connect the main body  10  to the corner. This will be described below in greater detail. 
     Such a configuration allows the vertical frame  12  and the horizontal frame  13  to be firmly coupled to each other through the coupling method of the fitting protrusion  15  with the fitting hole  16 . A user places the support plate  14  on the holding part  133  of the horizontal frame  13  connected to each edge, thus defining one storage part  11 . 
     In addition, the fitting hole  16  and the fitting protrusion  15  will be described in greater detail with reference to  FIGS. 2A, 2B, 3A, 3B, and 3C . 
     First, the fitting protrusion  15  is integrally formed on the connection part  131  of the horizontal frame  13  to firmly ensure a support force generated by the fitting protrusion  15 . 
     The fitting protrusion  15  includes a body part  153  protruding from the connection part  131 , and a wing part  155  connected with the body part  153  to protrude therefrom. 
     Preferably, the wing part  155  is bent to protrude further from the body part  153 , but is not an essential component. 
     While the wing part  155  is fitted into the fitting hole  16 , the wing part  155  is in contact with an inner surface (surface in the spacing groove  124 ) of the vertical frame  12  on both sides of the fitting hole  16 , so that the horizontal frame  13  is fixed to the vertical frame  12 . In this case, the body part  153  supports a vertical load of the vertical frame  12 , and the wing part  155  supports a diagonal load inwards of the vertical frame  12 . 
     The fitting hole  16  includes an upper wide part  161  that is formed to be wider than the wing part  155 , a lower narrow part  163  that is narrower (slightly smaller or equal) than the body part  153  to allow the body part  153  to be interference-fitted therein, and an intermediate width part  165  that connects the wide part  161  with the narrow part  163  is narrower than the wide part  161  and is wider than the narrow part  163 . 
     That is, the widths of the fitting hole  16  are formed to have the following relationship: wide part  161 &gt;width part  165 &gt;narrow part  163 . 
     Therefore, if the fitting protrusion  15  is inserted into the wide part  161 , the body part  153  is primarily fitted into the width part  165  by the load of the horizontal frame  13 . In this state, if the horizontal frame  13  is struck using a tool such as a hammer, the fitting protrusion  15  is firmly fitted into the fitting hole  16  while the body part  153  is interference-fitted into the narrow part  163 . 
     After the horizontal frames  13  are assembled in a rectangular shape with the vertical frames  12  that are arranged to be parallel to each other, using the fitting protrusion  15  and the fitting hole  16 , the support plate  14  is seated on the holding part  133  to be supported thereon. Thereby, it is possible to store things on the support plate  14 . 
     In this case, since the support plate  14  is seated on the inner side of the vertical frame  12 , namely, between the first support part  121  and the second support part  122  that are perpendicularly connected to each other, a separate fixing operation is not required. A bolt fastening hole  133   a  may be further formed on the holding part  133 , so that the support plate  14  seated on the holding part  133  may be fastened by a bolt. 
     The main body  10  configured as such is advantageous in that the height of the support plate  14  may be variously changed by coupling the horizontal frame  13  to any one of the fitting holes  16  of the vertical frame  12 , the entire height of the shelf may be changed using an extension bracket  90  that will be described later, and consequently it is unnecessary to use the bolt when the shelf is assembled, thus making it easy and convenient to assemble the shelf. 
       FIGS. 4A, 4B, 4C, 4D, 5A, and 5B  show a configuration wherein a door  33  may be assembled with the prefabricated shelf assembly according to the present invention. The door unit  30  (including the door  33 ) may be provided on any one of the plurality of storage parts  11 . The door unit is provided on the front of the storage part  11  to open or close the storage part  11 . 
     In detail, the door unit  30  includes the upper rail  311  shown in  FIGS. 4A and 4B , and a lower rail  313  shown in  FIGS. 4C and 4D  to allow the door  33  to be slidably moved along the rails (herein, a rail  31  includes the upper rail  311  and the lower rail  313 ). 
     First, the upper rail  311  is described with reference to  FIGS. 4A and 4B . The upper rail  311  includes a front connection part  311   a  that has on both sides thereof fitting protrusions in the shape similar to that of the horizontal frame  13 , an upper holding part  311   b  that is provided on an upper portion of the front connection part  311   a  to be bent therefrom, and the rail forming part  311   c  that is bent downwards from the upper holding part  311   b  to be spaced apart from the front connection part  311   a  as described above, thus defining an upper rail groove  311   d.    
     Thus, if the door  33  is coupled to the shelf assembly, the upper portion of the door  33  is introduced into the rail forming part  311   c  to safely slide leftwards and rightwards. All the horizontal frames  13  may be replaced with the upper rail  311  to allow a user to assemble the door  33  if necessary, and the upper rail  311  and the horizontal frame  13  may be separately configured. The scope of the invention is not limited thereto. 
       FIGS. 4C and 4D  illustrate the lower rail  313 . The lower rail  313  is different in structure from the upper rail  311 , and is configured to be easily fitted into the front of the storage part  11 . 
     First, the lower rail  313  includes a fitting plate  313   a  that has the shape of a plate and is fitted into the front of the support plate  14  placed on the holding part  133 , and a bottom plate  313   b  that is perpendicularly provided on the fitting plate  313   a  to define a lower rail groove  313   c . A plurality of rail protrusions is provided on the bottom plate  313   b  to define the lower rail groove  313   c.    
     That is, in the case of installing the lower rail  313 , the support plate  14  is placed on the holding part  133 , and the fitting plate  313   a  is fixedly fitted into the front of the support plate  14 . Consequently, both sides of the lower rail  313  are located between any one of the support parts of the vertical frame  12  and the support plate  14 . 
     Here, a gap between the support plate  14  and the vertical frame  12  is narrow, so that the lower rail  313  is interference-fitted into the gap. A degree to which the fitting plate  313   a  protrudes downwards is equal to or less than the thickness of the support plate  14  to make the bottom plate  313   b  be in close contact with the upper surface of the support plate  14 . 
       FIGS. 5A and 5B  illustrate the door  33  that is provided to slide along the upper rail  311  and the lower rail  313 . The door has the shape of a plate to slide along a rail  31  (it collectively refers to the upper rail  311  and the lower rail  313 ), a handle hole  331  is formed in the door  33 , and a handle frame  35  is provided in the handle hole  331 . 
     The handle frame  35  is provided to achieve a high quality, close the handle hole  331 , and increase durability. The handle frame is configured such that a first handle  351  and a second handle  352  are coupled to both sides. 
     In detail, the first handle  351  includes a cylindrical body  351   a , and a first outer flange part  351   b  that is provided on a side of the body  351   a  to have a larger diameter. 
     The second handle  352  includes a coupling projection  352   a  that is coupled to a side of the cylindrical body  351   a , and a circular second outer flange part  352   b  that is provided on a side of the coupling projection  352   a.    
     A coupling groove  351   aa  is formed in the body  351   a  so that the coupling projection  352   a  is introduced into the coupling groove. A fastening protrusion  351   ab  is provided on the coupling groove  351   aa , and a fastening hole  352   aa  is formed in the coupling projection  352   a  so that the fastening protrusion  351   ab  is fitted into the fastening hole. Thus, the first handle  351  and the second handle  352  may be fitted into both sides of the handle hole  331  to be firmly coupled to each other. 
     As the first outer flange part  351   b  and the second outer flange part  352   b  are in close contact with the periphery of the handle hole  331 , such a configuration prevents the handle frame  35  from being removed and provides a good appearance. 
       FIGS. 6A, 6B, and 6C  illustrate an outer-wall bracket  23  and an outer wall  21  constituting the outer-wall unit  20  provided on the main body  10 , which will be described in detail with reference to the drawings. 
     First, the outer-wall bracket  23  is configured to support the inner side of the outer wall  21 , thus allowing a user to easily assemble the outer wall  21 . 
     The outer-wall bracket includes a body  231 , a coupling protrusion  233  provided on a side of the body  231  to be coupled to the fitting hole  16 , and a bearing part  235  provided on the body  231  to bear the inner side of the outer wall  21  provided on the storage part  11 . 
     In detail, the outer-wall bracket  23  is secured to the fitting hole  16  of the vertical frame  12 . The coupling protrusion  233  is provided on a side of the body  231 . The coupling protrusion  233  includes a pillar part  233   a , and a head part  233   b  having a diameter larger than that of the pillar part  233   a . Both the pillar part  233   a  and the head part  233   b  have circular shapes. 
     In other words, the pillar part  233   a  has a diameter to be interference-fitted into the narrow part  163  of the fitting hole  16 , and the head part  233   b  is provided to pass through the wide part  161  and then be seated into the spacing groove  124 . 
     Furthermore, the bearing part  235  is provided on the body  231  to protrude therefrom. The bearing part  235  is formed to be narrower than the body  231  to define an outer-wall seat part  235   a . A diagonal cutting part  231   a  is provided on a side opposite to the bearing part  235  and is cut diagonally to prevent two outer-wall brackets  23  adjacent to the corner from interfering with each other. 
     The outer wall  21  has the shape of a plate similarly to the door  33 . The assembling method of the outer wall is as follows: if the outer wall  21  is located at an outer position inside the storage part  11 , the upper and lower portions of the outer wall  21  are supported by the connection part  131  of the horizontal frame  13 . At this time, the outer-wall bracket  23  is fixed. Both left and right sides of the outer wall  21  are located in the bearing part  235  of the outer-wall bracket  23 , more precisely, in the outer-wall seat part  235   a  to be supported by the bearing part  235 , thus preventing the outer wall  21  from falling down. 
     According to the present invention, a plurality of main bodies  10  may be arranged, a plurality of vertical frames  12  may extend, and an assembly kit K may be further provided. The assembly kit includes at least one of various brackets so that not the outer wall  21  but a grid wall or a fixing rod may be installed on a side surface of the shelf assembly. 
     Hereinafter, each of the brackets will be described in detail with reference to the accompanying drawings. 
     First,  FIG. 7  illustrates a connection bracket used when the main bodies  10  are arranged to be parallel to each other, namely, a fixing clip  40 . 
     The fixing clip fixes the neighboring vertical frames  12  to firmly fix the main bodies  10 . 
     In detail, the fixing clip  40  includes a clip body  41  that has an ‘U’ shape to define a receiving part  411  therein, and flanges  43  that are provided on both ends of the clip body  41  to protrude outwards. The clip body  41  further includes an elastic support piece  413  protruding towards the receiving part  411 . 
     In detail, first, the elastic support piece  413  is integrally formed on the clip body  41 , and has a vertical cutting part  413   a  to protrude towards the receiving part  411 . 
     When the fixing clip  40  is adjacent to the vertical frame  12 , the fixing clip is fitted over a pair of support parts to surround the support parts (the first support part  121  or the second support part  122 ) that are in close contact with each other, thus preventing the supports parts from being separated from each other. 
     In other words, the support parts coming into close contact with each other are introduced into the receiving part  411 . In this case, the elastic support piece  413  is fitted into the fitting holes  16  formed in the support parts that are in close contact with each other, thus preventing the fixing clip  40  from being easily removed. 
     Furthermore, the flange  43  may come into close contact with the inner side of the vertical frame  12 , thus obtaining a higher support force. 
     Therefore, even if a user arranges the plurality of main bodies  10  side by side, the vertical frames  12  of the adjacent main bodies  10  that are different from each other are fixed to each other by the fixing clip  40 , thus further enhancing durability. 
       FIGS. 8A, 8B, and 8C  illustrate another bracket. That is, the drawings are related to inside and outside brackets  50  that are provided on both sides of one vertical frame  12  to be used to connect the horizontal frame  13  thereto. 
     This may be applied to a case where two main bodies  10  are connected to each other, for example. Two vertical frames  12  are arranged at edges of the neighboring main bodies  10 . In order to efficiently utilize a space, either of the vertical frames  12  is eliminated, and the bracket is used to couple the horizontal frame  13  to both sides of one vertical frame  12 . 
     This is the bracket that is required because the fitting hole  16  of the vertical frame  12  according to the present invention is formed only on the inner side. 
     This includes an inside bracket  51  that is coupled to the inner side of the vertical frame  12  with respect to any one of the vertical frames  12 , and an outside bracket  53  that is coupled to the inside bracket  51  and is located at the outer side (outer side of the shelf) of the vertical frame  12 . 
     First, since it is apparent that the inside bracket  51  and the outside bracket  53  include connection parts  511  and  531  and holding parts  512  and  533  provided on the upper portions of the connection parts, similarly to the horizontal frame  13 , the detailed description thereof will be omitted herein. 
       FIG. 8A  illustrates the inside bracket  51 , which is different from the general horizontal frame in that inner step parts  513  are formed on both sides of the connection part  511  to be stepped inwards, and a fitting protrusion  513   a  is formed on each of the inner step parts  513 . 
     Further, fitting holes  511   a  are formed in the connection part  511  to be spaced apart from each other. 
     Thus, as shown in  FIG. 8C , if the fitting protrusion  513   a  of the inner step part  513  is coupled to the vertical frame  12 , the connection part  511  is located to be level with the outer surface of the vertical frame  12  due to a height difference between the inner step part  513  and the connection part  511 . At this time, the outside bracket  53  is coupled to the inside bracket  51 . 
     The outside bracket  53  will be described below. A fitting protrusion  531   a  may be provided on the connection part  531  to be fitted into the fitting hole  511   a  formed in the inside bracket  51 . Sidewalls  535  are provided on both sides of the connection part  531  to be bent inwards, and a fitting hole  535   a  is formed in each of the sidewalls  535 . 
     Therefore, if the inside bracket  51  and the outside bracket  53  are connected to each other, they are assembled with each other as shown in  FIG. 8C . At this time, as the fitting protrusion  15  of another horizontal frame is fitted into the fitting hole  535   a  formed in the sidewall  535 , it is possible to couple the horizontal frames  13  to both sides of one vertical frame  12 . 
       FIGS. 9A, 9B, 9C, and 9D  illustrate a corner bracket  60 , which is used when two neighboring main bodies  10  are perpendicularly arranged (see  FIG. 9D ). 
     The corner bracket  60  includes a body  61  that defines a space  611  therein, and a plate  63  that extends from a side of the body  61  and is perpendicular thereto to form an “L” shape similarly to the body  61 . 
     In this regard, a fitting hole  613  is formed in one surface of the body  61  (a side adjacent to the plate  63 ), a fitting hole  631  is also formed in the plate  63 , and a fitting protrusion  615  is provided on the other surface of the body  61  (a surface opposite to the surface having the fitting hole  613 ). 
     First, when the corner bracket  60  is disposed on the corner of the main body  10 , the corner bracket is in close contact with a side surface of the shelf that is perpendicularly adjacent to the front of the shelf. Thus, this bracket fixes two main bodies to each other to ensure stability, and gets rid of one vertical frame  12  to enhance the convenience of use. 
     For the convenience of description, in  FIG. 9D , a left shelf is referred to as a first shelf A 1 , and a right shelf is referred to as a second shelf A 2 . In order to clearly show a coupling relationship, the support plate  14  of the second shelf A 2  is not shown in the drawing. 
     First, if two main bodies  10  are simply arranged as shown in the drawing, one vertical frame  12  should be provided on a portion shown by a one-dot chain line of  FIG. 9D . If the vertical frame  12  is provided, it is difficult to take things out of the corner of the first shelf A 1 , it degrades the appearance, and limits a storage space. 
     Therefore, the corner bracket  60  is intended to solve the above-described problems and firmly fix the two main bodies  10 . 
     First, the fitting protrusion  615  provided on the body  61  is fastened to the sub-fitting hole  135  formed in the horizontal frame  13  of the first shelf A 1 . The fitting protrusion  15  of the left horizontal frame  13  of the second shelf A 2  is fastened to the fitting hole  613  formed in the body  61 . 
     Furthermore, the fitting protrusion  15  of the front horizontal frame  13  of the second shelf A 2  is fastened to the fitting hole  631  formed in the body  63 . In this manner, the first shelf A 1  and the second shelf A 2  may be firmly fixed to each other. 
     As shown in the drawings, the space  611  is formed in the body  61  in consideration of the width of the support part of the vertical frame  12  coming into close contact with the first and second shelves. In addition, the space  611  ensures a space to accommodate the fitting protrusion, when the fitting protrusion is fitted into the fitting hole  613  formed in the body  61 . 
     Moreover, if the space  611  is exposed to the outside, the appearance becomes poor, and foreign matter may enter the shelf. In order to solve these problems, as shown in  FIG. 9C , it is preferable that a corner closure member  65  is further provided to be fitted into the upper portion of the space  611 . 
       FIGS. 10A and 10B  illustrate a grid-wall bracket  70  that is provided to allow a hanger or the like to be hung onto a grid wall that is provided on a side of the shelf where no outer wall  21  is formed. 
     The grid-wall bracket  70  includes a body  71 , and a coupling protrusion  73  provided on a side of the body  71  to be fitted into the fitting hole  16 . A fixing recess  711  is formed in the body  71  to be downwardly inclined in a diagonal direction, and a locking step  713  is provided on an end of the fixing recess  711 , namely, the deepest place to prevent the removal of the grid wall. 
     Since the coupling protrusion  73  has the same shape as the above-described coupling protrusion  233  provided on the outer-wall bracket  23 , the detailed description thereof will be omitted herein. 
     If the grid-wall bracket  70  is coupled to the fitting hole  16  of the vertical frame  12  and then a user fits the grid wall into the fixing recess  711  from an upper position to a lower position in the diagonal direction, a convenient assembly is realized, thus improving the convenience of use and assembly. The grid wall is not easily removed by the locking step  713 , and the plurality of fixing recesses  711  is provided to allow an installation height to be changed as desired. 
       FIGS. 11A and 11B  are similar to  FIGS. 10A and 10B , and illustrate a fixing-rod bracket  80  for installing a fixing rod. 
     As shown in the drawings, the bracket includes a body  81  and a coupling protrusion  83 . Similarly to the grid-wall bracket  70 , a fixing recess  811  is formed in the body  81  to allow the fixing rod to be coupled between a pair of fixing-rod brackets  80 . Since this bracket is similar to the above-described grid-wall bracket  70  in terms of its use and mounting method, the detailed description thereof will be omitted herein. 
       FIG. 12  illustrates an extension bracket  90  that connects two vertical frames  12  to each other to change the height of the shelf. The configuration of the extension bracket will be described with reference to  FIGS. 1 and 12 . 
     First, the entire shape of the extension bracket  90  has an ‘L’ shape which is the same as the vertical frame  12 . The extension bracket may be divided into a lower fitting part  92  and an upper fitting part  91 , and a stopping protrusion  93  is formed between the lower fitting part  92  and the upper fitting part  91  to protrude therefrom. 
     The upper and lower parts of the extension bracket  90  are shaped to be symmetrical with respect to the stopping protrusion  93 . When two vertical frames  12  are arranged in a vertical direction, the lower fitting part  92  is introduced into the lower vertical frame  12 , and the upper fitting part  91  is introduced into the upper vertical frame  12 . 
     More precisely, the upper fitting part  91  and the lower fitting part  92  are fitted into the space of the vertical frames  12 . 
     The stopping protrusion  93  performs two functions, namely, the function of evenly distributing force by introducing the same area into two vertical frames  12 , and the function of preventing the extension bracket  90  from slipping down when the extension bracket  90  is fitted into the lower vertical frame  12 . 
     That is, the stopping protrusion  93  is located between ends of two vertical frames  12 . 
     In addition, in order to enhance stability and durability, a plurality of frictional protrusions  94  is provided on the inner sides of the upper and lower fitting parts  91  and  92  to increase a frictional force and be fitted into the fitting holes  16  of the vertical frames  12 , thus preventing the extension bracket from being removed as long as a predetermined force is not applied thereto. An entry guiding part  96  inclined in a diagonal direction is further provided on each vertex to make it easier to couple the vertical frames, thus enhancing the convenience of assembly. 
     Moreover, a plurality of reinforcing ribs  95  is provided on the corner of the extension bracket to enhance durability. 
     Although the present invention was described with reference to specific embodiments shown in the drawings, it is apparent to those skilled in the art that the present invention may be changed and modified in various ways without departing from the scope of the present invention, which is described in the following claims.