Background Art [2] Fig. 1 is a perspective view ihstrating a conventional rack for communication equipment.

[3] As shown in the drawing, a conventional rack 1 for comTmnication equipment includes a rectangular base plate 2 and posts 4 that are rrdunted verticaly on the base plate 2. Reinforcing plates 6 are attached to the posts 4 and bus bars 8 are fixed to the reinforcing plates 6.

[4] A phratity of through-hdes 10 is provided at the reinforcing plates 6 in a vertical fine. Two groups of through-hdes 10 provided at the respective reinforcing plates 6 are opposed to each other. Further, a phrafity of cabling bars 12 is mounted to the re- inforcing plates 6 in such a manner that both end portions of each cabling bar 12 are fitted through the two opposite through-hdes 10.

[5] A phratity of shelf units for storing communication equipment are mounted in the rack 1, which wit be described with reference to Figs. 2 and 3. A shelf unit 20 comprises a pair of side panels 22 and 24. It further comprises supporting plates 26 and 28 that are mounted to the top of the front and rear end portions of the side panels 22 and 24 for supporting them.

[6] Front PCBs (printed circuit board) 40, which indide a power unit and a PBA (printed board assembly) unit, are mounted in the front-half portion of the shelf unit 20. A back board 30, to which the front PCBs 40 are connected, is mounted in the central portion of the shelf unit 20. Rear PCBs 50 are mounted in the rear-half portion of the shelf unit 20 and connected to the back board 30. In order to support the front and rear PCBs 40 and 50, PCB guides 32 and 34 are mounted at the bottom of the front and rear end portions of the side panels 22 and 24. Al components described above are coupled to one another by means of screws 36 and 38.

[7] A procedure of dermunting the back board 30 from the conventional shelf unit 20 is explained as fdbws. First, the front PCBs 40 and rear PCBs 50 are removed from the back board 30. Secondly, the screws 38 for fixing the supporting plate 28 and PCB guide 34 to the side panels 22 and 24 are released to separate the supporting plate 28 and PCB guide 34 from the side panels 22 and 24. Finaly, the screws 36 for fixing the back board 30 to the shelf unit 20 are released to separate the back board 30 from the shelf unit 20.

[8] Remounting the back board 30, supporting plate 28 and PCB guide 34 to the shelf unit 20 can be achieved according to the order that is reverse to the above-mentioned demounting procedure.

[9] However, when dermunting and remounting the back board from and to the shelf unit for repairs or maintenances, there is a problem in that a worker must also dermunt and remount other elements (e. g. , the supporting plate, the PCB guide, etc. ) by releasing and fastening a phra) ity of screws by hand. Therefore, it takes nuch time and labor to repair or replace the back board.

[10] Further, it is very troublesome for the worker to align the screw hates of two cor- responding elements when screwing them together.

Disclosure of Invention Technical Problem [11] The object of the present invention is to provide a shelf unit for use in a rack for communication equipment that is designed to facilitate the demounting and remounting of a back board from and to the shelf unit for repairs or maintenances.

Technical Solution [12] To accomplish the above-mentioned object, there is provided a shelf unit for use in a rack for communication equipment, comprising: a front body, which inchdes (1) a pair of side panels having front and rear ends and defining a space for containing PCBs, and (2) connecting members mounted adjacent to the rear ends of the side panels and protruding outward from the side panels; a back board, to which the PCBs are connected, detachably mounted to the rear ends of the side panels of the front body; and a rear body, which indes (1) a pair of side panels having front and rear ends and defining a space for containing PCBs connected to the back board, (2) a pair of connecting plates extending forward from the front ends of the side panels and having a distance therebetween so that the connecting plates are in dose contact with outer surfaces of the side panels of the front body, and (3) slots provided at the connecting plates into which the respective connecting members are fitted.

Advantageous Effects [13] According to the features of the present invention, a front body and a rear body are provided separately and assembled or disassembled simply with or from each other by means of connecting members of the front body and sbts of the rear body. Thus, a worker can easily dermunt and remount a back board which is provided between the front body and the rear body.

Brief Description of the Drawings [14] The above object and features of the present invention wit become rmre apparent from the flowing description of the preferred embodiments given in conjunction with the accompanying drawings.

[15] Fig. 1 is a perspective view showing a conventional rack for communication equipment.

[16] Fig. 2 is a perspective view showing a conventional shelf unit for use in a rack for communication equipment.

[17] Fig. 3 is an expbded perspective view showing the shelf unit depicted in Fig. 2.

[18] Fig. 4 is a perspective view showing a shelf unit for use in a rack for com- munication equipment in accordance with a preferred embodiment of the present invention.

[19] Fig. 5 is an expbded perspective view showing the shelf unit depicted in Fig. 4.

[20] Fig. 6 is an enlarged view showing a connecting member and a connecting plate of the shelf unit.

[21] Fig. 7 is an enlarged view showing a coupling state of the connecting member and the connecting plate of the shelf unit.

Best Mode for Carrying Out the Invention [22] The embodiment of the present invention wit be readily understood as generaly described and itstrated in the Figures provided herein and the accompanying text according to the above-identified technical scope of the present invention.

[23] Fig. 4 is a perspective view showing a shelf unit in accordance with a preferred embodiment of the present invention. Fig. 5 is an expbded perspective view showing the shelf unit depicted in Fig. 4.

[24] As shown in the drawings, a shelf unit 100 according to the present invention comprises (1) a front body 110 in which front PCBs 150 are mounted, (2) a back board 140 which are fixed to the rear end of the front body 110 by means of screws, and (3) a rear body 120 detachably combined with the front body 110, in which the rear PCBs 160 are rmunted. The front and rear PCBs 150 and 160 are connected to the back board 140.

[25] The front body 110 inondes (1) a pair of side panels 112 and 114 defining a space for containing the front PCBs 150, (2) a supporting plate 116 mounted at the top of the front end portion of the side panels 112 and 114 for supporting them, (3) a PCB guide 118 mounted at the bottom of the side panels 112 and 114 for guiding the front PCBs 150, and (4) connecting members 119 mounted adjacent to the rear end portions of the side panels 112 and 114. Each connecting member 119 protrudes outward from the side panels 112 and 114 by a predetermined height. Preferably, the connecting member 119 is implemented as a screw, which is fastened into the side panels 112 and 114 of the front body 110 by a certain depth.

[26] The rear body 120 invades (1) a pair of side panels 122 and 124 defining a space for containing rear PCBs 160, (2) a supporting plate 126 mounted at the top of the rear end portion of the side panels 122 and 124 for supporting them (3) a PCB guide 128 mounted at the bottom of the side panels 122 and 124 for guiding the rear PCBs 160, and (4) a pair of connecting plates 129 extending from the front ends of the respective side panels 122 and 124 toward the front body 110.

[27] The pair of connecting plates 129 has such a distance therebetween that the connecting plates 129 are in dose contact with the outer surfaces of the side panels 112 and 114 of the front body 110. Also, the connecting plates 129 are provided with L-shaped slots 130 into which the connecting members 119 formed at the side panels 112 and 114 of the front body 110 are fitted. This is so that the connecting plates 129 become hung by the connecting members 119.

[28] As shown in Fig. 6, each L-shaped sbt 130 has a horisntal portion 132 extending horix) ntaly from the front end of the connecting plate 129 and a vertical portion 134 extending verticaly upward from the end of the honxmtat portion 132.

[29] When assembling the shelf unit 100 of the present invention, the front and rear bodies 110 and 120, to which the supporting plates 116 and 126 and the PCB guides 118 and 128 are mounted, are provided preferentialy.

[30] Then, as shown in Figs. 5 and 6, the back board 140 is mounted to the rear end portion of the front body 110 in an erected state by means of screws. Then, the rear body 120 is moved toward the front body 110 while the connecting plates 129 closely contact the side panels 112 and 114 of the front body 110 until the connecting members 119 protruding outward from the side panels 112 and 114 of the front body 110 enter into horix) ntat portions 132 of the L-shaped sbts 130. In a state where the respective connecting members 119 of the front body 110 enter the ends of the horix) ntal portions 132 of the respective L-shaped sbts 130 of the rear body 120, if the moving force applied to the rear body 120 is removed, then the rear body 120 becomes subjected to a downward force due to its own weight, in which the connecting members 119 proceed into vertical portions 134 of the L-shaped sbts 130. As a resdt, the rear body 120 is combined with the front body 110 in such a manner that the connecting plates 129 of the rear body 120 are hung by the connecting members 119 of the front body 110, as shown in Fig. 7.

[31] Accordingly, the front and rear bodies 110 and 120 can be easily disassembled simply by piling the connecting plates 129 of the rear body 120 out of the connecting members 119 of the front body 110. This facilitates the procedures of detmunting and remounting the back board 140 from and to the shelf unit 100 when there needs to be a repair or replacement.

[32] White the present invention has been shown and described with respect to a particular embodiment of a shelf unit for use in a rack for communication equipment, it wil be apparent to those skiled in the art that many changes and modifications may be made without departing from the scope of the invention as defined in the appended daims and those equivalent thereto.

Industrial Applicability [33] As described above in detail, there is provided a shelf unit for use in a rack for com- munication equipment that insides a front body and a rear body which are provided separately and assembled or disassembled simply with or from each other by means of connecting members of the front body and L-shaped sbts of the rear body. Thus, a worker can easily dermunt and remount a back board which is provided between the front body and the rear body. Accordingly, the time and labor required to repair or replace the back board can be significantly mitigated.