JP4500931B2 - Optional mounting structure - Google Patents

Description

  The present invention relates to an attachment structure for attaching a desired option member to furniture with a top board represented by a desk.

In office desks and the like, it is often the case that various optional members can be attached to the counter-use end side of the top plate. Conventionally, as a structure for attaching an optional member to a top plate, a structure disclosed in Patent Document 1 below is adopted. That is, the mounting bracket (or bracket) for mounting the optional desktop panel is brought into contact with the outer surface side of the side wall of the top plate, the plate nut is disposed on the inner surface side of the side wall of the top plate, and the bolt is mounted on the mounting bracket. And after penetrating the side wall of the top plate and screwing it onto the plate nut and tightening and fixing them, the desktop panel is supported by the mounting bracket.
Japanese Patent Laid-Open No. 06-343517

  However, in the case of the above example, the through hole made in the mounting bracket, the through hole made in the side wall of the top plate, and the bolt hole made in the plate nut must be aligned so that they overlap each other. Must not. Moreover, it is necessary to screw the bolts while holding both the mounting bracket exposed outside the top plate and the plate nut accommodated in the top plate, and there is no denying that the installation work becomes complicated. .

  An object of the present invention made in view of the above is to simplify the work of attaching an optional member to a top plate.

  In order to solve the above-described problems, in the option mounting structure according to the present invention, an optional member is attached to a top plate having a side structure wall via a bracket, A bracket insertion port is provided to communicate the internal space located on the inner surface side of the side structure wall to the outside, and the insertion end of the bracket inserted into the internal space through the bracket insertion port penetrates the side structure wall. It was made to fix | tighten and fix to the inner surface side of the side part structure wall with the made fastener.

  If it is such, compared with the conventional attachment structure which uses a plate nut separately, attachment will become a simpler thing. In addition, since the bracket is in a state where the part other than the insertion end is exposed outside the top plate functionally, it is easier to adjust and hold the position than the plate nut completely accommodated in the top plate, In that sense, the installation work becomes easy. In addition, the bracket insertion end, the bracket insertion opening, and the like are shielded from the line of sight of the user who is seated on the use end side of the top plate, so that the furniture can be kept in good condition.

  If the fastening tool is a bolt and a nut portion into which the bolt is screwed is provided at the insertion end of the bracket, the bracket can be easily attached to and detached from the top plate.

  An openable / closable shutter that mounts a rear end member on the opposite side of the top plate and pierces the rear end member in the front-rear direction to form the bracket insertion port and shields the slot hole. If the bracket is provided on the rear end member, the bracket insertion opening can be shielded when the bracket and the optional member are not used.

  Specific examples of the option member include a wiring box (or a wiring duct) that can accommodate cords such as a power supply cord and a communication cable connected to various devices. When the optional member is a wiring box, the bracket is provided with a wiring box support for supporting the wiring box.

  Another example of the optional member is a desktop panel. When the option member is a desktop panel, the bracket supports the desktop panel.

  Further, when attaching a plurality of optional members to the top plate, a second bracket is disposed on the outer surface side of the side structure wall, and the bracket and the second bracket are fastened and fixed with the fasteners. It is also conceivable that separate option members are supported by the bracket and the second bracket, respectively.

  According to the present invention, the operation of attaching the option member to the top plate can be simplified.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the description, the use end side on which the user who uses the desk D (or furniture with a top plate) is seated is defined as the front, and the counter use end side is defined as the rear.

  The desk D of this embodiment is shown in FIG. This desk D is used in, for example, an office, and is an option that can be detachably attached to the top plate 1, the legs 2 that are supported from below the top plate 1, and the top plate 1 via the bracket 4. And at least the member 3.

  As shown in FIGS. 2 to 5, the top plate 1 mainly includes a top plate body having a substantially rectangular shape in plan view formed by bending a sheet metal material. The top plate body includes a top plate surface 11, a side structural wall 12 and a rear structural wall 13 orthogonal to the top plate surface 11, and the top plate surface 11, the side structural wall 12 and the rear structural wall 13 It has an enclosed internal space. A reinforcing material (not shown) extending in the width direction is joined to the back side of the top plate surface 11 by welding or the like. Thus, the side end member 14 is mounted on the outer surface of the side structural wall 12, and the rear end member 15 and the flexible member 16 are mounted on the rear surface of the rear structural wall 13, respectively.

  The side end member 14 is a long strip-shaped member made of a hard resin. On the inner side surface facing the side structure wall 12, protrusions 141 protruding inward and bent rearward are intermittently formed at a plurality of locations along the front-rear direction. These protrusions 141 are used when the side end member 14 is attached to the side structure wall 12. That is, through-holes 121 are previously drilled at positions corresponding to the protrusions 141 in the side structure wall 12, and the side end member 14 is moved to the side structure wall 12 by inserting the protrusions 141 into the through-holes 121. After that, both are fastened with mounting bolts (not shown).

  In the vicinity of the rear end of the outer side surface of the side end member 14, a recessed portion 142 that is recessed in a substantially square shape in side view is provided. A through hole 143 for penetrating a fastening tool (bolt) 5 described later is formed in the recessed portion 142. The side structural wall 12 also has a through-hole 122 through which the fastener 5 can be inserted. The through hole 143 formed in the recessed portion 142 of the side end member 14 and the through hole 122 formed in the side structure wall 12 overlap in side view when the side end member 14 is mounted on the side structure wall 12.

  The concave portion 142 of the side end member 14 can be covered and concealed by the side cap 144 and the slit cap 145 in a normal state. The side cap 144 is detachable from the side end member 14, and the slit cap 145 is detachable from the side cap 144.

  The rear end member 15 is a small box-shaped member made of a hard resin and having an inner peripheral portion opened rearward. The rear end member 15 is paired on both the left and right sides of the top plate 1. Protrusions 151 protruding forward are formed at a plurality of locations on the front surface facing the rear structural wall 13. In addition, the front end wall of the rear end member 15 has a through hole 152 communicating with the inner peripheral portion. The protrusion 151 and the through hole 152 are used when the rear end member 15 is attached to the rear structural wall 13. That is, in the rear structural wall 13, a through hole 131 is formed in a position corresponding to the protrusion 151, a bolt hole 132 is formed in a position corresponding to the through hole 152, and the protrusion 151 is inserted into the through hole 131. The member 15 is positioned with respect to the rear structural wall 13, and then a mounting bolt 153 is screwed into the bolt hole 132 through the through hole 152 to fasten them together.

  With the side end member 14 mounted on the side structural wall 12 and the rear end member 15 mounted on the rear structural wall 13, the inner surface of the side end member 14 and the outer surface of the rear end member 15 are in close contact or close to each other. At the same time, the rear end of the side end member 14 and the rear end of the rear end member 15 are substantially flush. Incidentally, a protrusion 154 that protrudes outward and bends forward is formed on the outer surface of the rear end member 15. This ridge 154 is inserted into a cut groove 146 cut into the rear end of the side end member 14.

  A slot hole 155 that penetrates in the front-rear direction and communicates with the inner peripheral portion is provided in the front end wall of the rear end member 15. The slot hole 155 is positioned outward so that the outer edge thereof substantially coincides with the inner surface of the side structural wall 12 when viewed from the back. The slot hole 155 is for inserting an insertion end 41 of the bracket 4 to be described later. An opening 133 through which the insertion end 41 can be inserted is also formed in the rear structural wall 13. The slot hole 155 bored in the front end wall of the rear end member 15 and the opening 133 formed in the rear structural wall 13 overlap each other when the rear end member 15 is attached to the rear structural wall 13, It becomes a bracket insertion port that communicates the internal space with the outside.

  The inner peripheral portion of the rear end member 15 can be covered and concealed by the shutter 156 at normal times. The shutter 156 includes the main shutter plate 156a and the sub shutter plate 156b as elements, and is provided so that the inner peripheral portion can be closed in the vicinity of the rear end of the rear end member 15. The main shutter plate 156a closes most of the inner peripheral portion in the rear view, and is supported on the inner peripheral surface of the rear end member 15 so as to be rotatable around the pin 156c disposed inward. The sub shutter plate 156b closes a partial region substantially corresponding to the slot hole 155 in the rear view, and is supported by the main shutter plate 156a so as to be rotatable through a hinge 156d.

  A flexible member 16 which is easily bent and deformed is mounted between the rear end members 15 mounted on the left and right sides of the top plate body. The flexible member 16 is a hollow injection molded product that extends along the width direction of the top plate 1. The rear end of the rear end member 15 and the rear end of the flexible member 16 form a rear edge of the top plate 1 continuously in a substantially straight line in plan view. The rear end member 15 ensures rigidity that can be abutted against other furniture, furniture, a wall surface of a room, or the like. On the other hand, the flexible member 16 can be used to drop cords (power supply cord, communication cable, etc.) connected to various devices placed on the top plate surface 11 below the top plate 1.

  Therefore, in the desk D of the present embodiment, a desired option member 3 can be attached to the rear end side of the top plate 1 via the bracket 4. The bracket 4 is used to support a wiring box 3 (wiring duct) which is one of optional members, and includes at least an insertion end portion 41 inserted into an internal space in the top plate body and the wiring. And a wiring box support portion 42 that supports the box 3. The bracket 4 in the illustrated example is a flat member made of sheet metal, and includes an insertion end 41 that extends horizontally in the front-rear direction and a wiring box support that extends vertically downward from the vicinity of the rear end of the insertion end 41. 42 forms a substantially inverted L-shape in a side view.

  The insertion end portion 41 is provided with a nut portion for screwing the bolt 5 serving as a fastening tool. Specifically, bolt holes 411 for screwing the bolts 5 are formed at positions corresponding to the through holes 122 and 143 formed in the side structure wall 12 and the side end member 14 of the top plate body, The nut part is configured.

  The wiring box support portion 42 is provided with a hook claw 421 and a horizontal support piece 422 which are direct means for supporting the wiring box 3. The hook claws 421 are upward claws protruding from the rear end edge of the wiring box support portion 42 and are provided intermittently at a plurality of locations along the vertical direction. The horizontal support piece 422 is bent inward from the lower end of the wiring box support portion 42 and has a through hole 423 at a predetermined position.

  When fixing the bracket 4 to the top plate 1, first, the shutter 156 that opens and closes the inner peripheral portion of the rear end member 15 is operated to open at least the region closed by the sub shutter plate 156b. Further, the side cap 144 and the slit cap 145 that hide the recessed portion 142 of the side end member 14 are removed. Next, the insertion end 41 of the bracket 4 is inserted from the rear into the bracket insertion opening, that is, the slot hole 155 of the rear end member 15 and the opening 133 of the rear structure wall 13, and the insertion end 41 is inserted into the internal space in the top plate body. To place. Then, while the outer surface of the insertion end 41 is brought into contact with the inner surface of the side structural wall 12, the bolt hole 411 of the insertion end 41 is inserted into the through hole 122 of the side structural wall 12 and the through hole of the recessed portion 142. 143 is positioned so as to overlap in side view. Thereafter, the bolt 5 is passed through the through holes 143 and 122 from the outside and screwed into the bolt holes 411, thereby fastening the insertion end 41 of the bracket 4 to the inner surface side of the side structural wall 12. As a result, the bracket 4 is fixed to the top plate 1. When the tightening of the bolt 5 is completed, the side cap 144 and the slide cover which have been removed previously are attached to the recessed portion 142 again to conceal the bolt 5 and the recessed portion 142. Needless to say, in order to detach the bracket 4 fixed to the top plate 1 from the top plate 1, it is only necessary to execute a procedure opposite to the above.

  The wiring box 3 can be supported on the wiring box support portion 42 of the bracket 4 fixed to the top plate 1. As shown in FIGS. 6 to 9, the wiring box 3 in the present embodiment includes a box body 31 having a wiring space opened upward, side plate bodies 32 closing both the left and right sides of the box body 31, and the wiring space above. And a lid 33 for further closing.

  The box body 31 is formed by bending a sheet metal material, and the front wall 312 and the rear wall 313 rise vertically from both front and rear edges of the bottom wall 311, and the bottom wall 311, the front wall 312, and the rear wall 313 are laterally cross-sectioned. This is a member having a substantially channel shape. The upper end of the front wall 312 is bent backward to form an upward surface, and square holes 314 are intermittently formed along the width direction on the upward surface. The height of the front wall 312 is considerably lower than the height of the rear wall 313. The dimension in the width direction of the box body 31, in other words, the inner dimension in the width direction of the wiring space is approximately equal to the dimension in the width direction of the flexible member 16 at the rear edge of the top plate 1. A reinforcing rail 315 extending along the width direction is joined to the front surface of the rear wall 313 by welding or the like.

  An outlet holder 34 for holding an outlet or the like (a power outlet, a communication connector or a modular jack, etc.) can be installed in the box body 31. The outlet holder 34 includes a holding surface portion 341 that opens an outlet arrangement port 344 that holds an outlet and the like, a front surface portion 342 that hangs down from the front edge of the holding surface portion 341, and a rear surface portion 343 that stands from the rear edge of the holding surface portion 341. With. The lower end of the front portion 342 is bent forward to form a horizontal plane, and a square hole 345 is formed at a predetermined portion of the horizontal plane. The square hole 345 drilled in the horizontal plane is similar to the square hole 314 drilled in the upward surface of the front wall of the box body 31. The outlet holder 34 has the horizontal surface of the front surface portion 342 placed on the upward surface of the front wall 312 of the box body 31, and the rear surface portion 343 and the vicinity of the rear end of the holding surface portion 341 are used as the reinforcing rails 315 of the box body 31. Install by supporting. The outlet holder 34 installed in the box body 31 is slidable in the width direction. In order to prohibit the movement of the outlet holder 34, the square hole 345 formed in the horizontal plane of the front surface portion 342 of the outlet holder 34 and the square hole 314 formed in the upward surface of the front wall 312 of the box body 31 overlap in plan view. After the outlet holder 34 is positioned as described above, a retainer (not shown) having a substantially prismatic shape or a substantially rectangular tube shape may be passed through the square holes 345 and 314.

  The left and right side plate bodies 32 that are paired to the left and right close both sides of the box body 31 and are also members that engage with the bracket 4. The outer method of the left and right side plate bodies 32 is substantially equal to the width dimension of the top plate 1 of the desk D. The upper end of the side plate body 32 is at a higher position than the upper ends of the front wall 312 and the rear wall 313 of the box body 31. Each of the side plate bodies 32 includes a side wall 321 directly joined to the box body 31 by welding or the like, and a side cover 327 covering the outer end of the side wall 321. The side wall 321 is formed in a thin box shape in which a sheet metal material is opened outward. A transparent window 322 is formed in the central portion of the inner surface facing the wiring space. In addition, an engagement piece 323 bent outward is cut and raised at a portion near the lower end of the inner side surface, and a nut 323a is provided on the engagement piece 323. On the front surface, hook holes 324 are intermittently drilled at a plurality of locations along the vertical direction, and a support piece inlet 325 is cut out at a height corresponding to the lower edge of the engagement piece 323. The hook hole 324, the support piece inlet 325, and the engagement piece 323 are engaged with a hook claw 421 and a horizontal support piece 422 provided on the wiring box support portion 42 of the bracket 4. In addition, bolt holes 326 are formed in two front and rear positions on the outward surface formed in the vicinity of the upper end. The bolt hole 326 is used when a support 7 described later is attached.

  The side cover 327 is a hard resin molded product that is attached to and covers the side wall 321 from the outside. The side cover 327 has a cylindrical body having a shape corresponding to the transparent window 322 protruding inward, and the cylindrical body is in close contact with or close to the periphery of the transparent window 322 when mounted on the side wall 321. A wiring path for guiding the cords stored in the wiring space to the outside of the wiring box 3 is configured. The wiring passage also functions as a handle for inserting a finger when the wiring box 3 is attached to or detached from the desk D or the bracket 4. Incidentally, it is preferable that the door plate 328 for opening and closing the wiring passage is rotatably attached to the side cover 327 via a hinge, for example. The vicinity of the upper end of the side cover 327 is partially cut away so as to expose the outward surface of the side wall 321 and the bolt hole 326. This notched portion can be concealed by attaching a corner cap 329.

  The lid 33 has a trapezoidal shape that is flat when viewed from the side, and is movably supported by the side plates 32 on both the left and right sides. In the wiring box 3 in the present embodiment, the lid 33 can be double-opened. That is, not only can the front edge of the lid 33 be lifted to open the wiring space from the front, but the rear edge of the lid 33 can be lifted to open the wiring space from the rear.

  When attaching the wiring box 3 to the bracket 4, as described above, the horizontal support piece 422 is attached to the support piece inlet 325 while the hook claw 421 is engaged with the hook hole 324 formed in the front surface of the side plate 32. insert. At this time, the horizontal support piece 422 that has entered the inside of the side plate body 32 comes into contact with the lower surface of the engagement piece 323. In order to completely fix the wiring box 3 to the bracket 4, fixing bolts 35 are screwed from below to nuts 323 a provided on the engaging pieces 323 through the through holes 423 of the horizontal support pieces 422. The horizontal support piece 422 and the engagement piece 323 may be fastened.

  When the wiring box 3 is attached to the desk D via the bracket 4, the upper end surface of the side plate body 32 is substantially flush with the top plate surface 11. When the lid 33 is closed, the upper surface of the lid 33 is also substantially flush with the top plate surface 11. At this time, the rear edge of the top plate 1 and the front edge of the lid 33 are close to each other without a substantial gap. In order to accommodate the cords connected to various devices placed on the top surface 11 in the wiring box 3, the front edge of the lid 33 is lifted to open the box body 31, and the flexible member 16. The cords may be dropped into the box main body 31 through the part where the box is mounted, and then the front edge of the lid 33 is lowered to close the box main body 31. Since there is a gap between the lid 33 and the front wall 312 and the rear wall 313, the wired cords and the lid 33 can be prevented from interfering with each other.

  As shown in FIG. 10, if another desk D ′ is disposed opposite to the rear end side of the wiring box 3, the wiring box 3 can be preferably used from both desks D and D ′. In order to accommodate the cords connected to the equipment placed on the top surface 11 of the desk D ′ in the wiring box 3, the rear edge of the lid 33 is lifted to open the box body 31, and the cord After dropping the item into the box body 31, the rear edge of the lid 33 is lowered to close the box body 31. In a state where the lid 33 closes the box body 31, the top plate 1 of the desk D, the top plate 1 of the desk D ', and the top surface of the lid 33 are substantially flush with each other to provide a large work area. .

  Furthermore, in this embodiment, as shown in FIG. 11 or FIG. 12, the desktop panel 6 can be attached to the wiring box 3 attached to the desk D. That is, the corner cap 329 attached to the side plate 32 of the wiring box 3 is removed to expose the outward surface of the side wall 321 and the bolt hole 326, and the support 7 that supports the desktop panel 6 (in the example shown in FIG. The desktop panel 6 can be attached by screwing a bolt 71 to the outward surface of the side wall 321 (which is substantially L-shaped in view, and is generally T-shaped in side view in the example shown in FIG. 12). it can.

  According to the present embodiment, the wiring box 3 as an optional member is attached to the top plate 1 having the side structure wall 12 via the bracket 4, and on the rear end (non-use end) side of the top plate 1, A bracket insertion port (opening 133, slot hole 155) for communicating the internal space located on the inner surface side of the side structural wall 12 with the outside is provided, and the bracket 4 inserted into the internal space through the bracket insertion port is inserted. Since the end portion 41 is fastened and fixed to the inner surface side of the side structure wall 12 by the fastener 5 penetrating the side structure wall 12, it is compared with a conventional mounting structure using a separate plate nut. As a result, the mounting operation becomes simpler. Since the portion other than the insertion end 41 of the bracket 4, that is, the wiring box support 42 is exposed to the outside of the top plate 1, it is easy to adjust and maintain the position of the insertion end 41. But installation work becomes easy. In addition, since the insertion end 41, the bracket insertion opening, and the like are shielded from the line of sight of the user who is seated in front of the desk D (the use end side of the top plate 1), it is possible to maintain the appearance of furniture.

  Since the fastener is a bolt 5 and a nut portion (bolt hole 411) into which the bolt 5 is screwed is provided at the insertion end 41 of the bracket 4, the bracket 4 can be easily attached to the top plate 1. Detachable.

  A rear end member 15 is mounted on the rear end side of the top plate 1, and a slot hole 155 that penetrates the rear end member 15 in the front-rear direction constitutes the bracket insertion port and shields the slot hole 155. Since the shutter 156 that can be opened and closed is provided in the rear end member 15, the bracket insertion port can be shielded when the bracket 4 and the option member 3 are not used.

  Since the wiring box support portion 42 for supporting the wiring box 3 is provided on the bracket 4, the wiring box 3 for storing the cords can be easily attached to and detached from the desk D, and the user benefit is improved. .

  The present invention is not limited to the embodiment described in detail above. In particular, the option member that is attached by adopting the attachment structure according to the present invention is not limited to the wiring box 3. For example, as an optional member, a desktop panel or the like may be attached to the top plate 1 of the desk D via a bracket. The bracket in this case has a function of supporting the desktop panel or the like instead of the function of supporting the wiring box 3.

  It is also conceivable to attach a plurality of optional members, for example, the wiring box 3 and the desktop panel 6 to the top plate 1 of the desk D at the same time. When a plurality of option members are attached to the top plate 1 simultaneously, as shown in FIG. 13, the insertion end 41 of the bracket 4 that supports one option member (for example, the wiring box 3) is connected to the side structure wall 12. The second bracket 8 supporting the other optional member (for example, the desktop panel 6) is disposed on the outer surface side of the side structure wall 12 while being disposed on the inner surface side of the bracket 4, and the bracket 4 and the second bracket 8 are disposed. Are fixed to the side structural wall 12 with the bolts 5 which are the same fasteners. The second bracket 8 includes, for example, a base end portion 81 that extends in the front-rear direction and a panel support portion that extends upward from the vicinity of the rear end of the base end portion 81 in the same manner as a mounting bracket used in a conventional desktop panel mounting structure. 82 is a member having a substantially L shape in side view, and a through hole 83 similar to that in the side structure wall 12 is formed in the base end portion 81 thereof. And the base end part 81 of the 2nd bracket 8 is contact | abutted to the outward surface of the recessed part 142 of the side end member 14, and the side end member 14 and the side part structure wall 12 are penetrated from the through-hole 83 of the base end part 81. The bolt 5 is screwed into the bolt hole 411 of the insertion end 41 of the bracket 4 and tightened. When such a second bracket 8 is used, only the side cap 144 is attached to the recessed portion 142 and the slit cap 145 is removed. This is because the panel support portion 81 of the second bracket 8 protrudes upward from the recessed portion 142 via the mounting portion of the slit cap 145.

  In the above-described embodiment, the relationship between the fastener 5 and the insertion end 41 of the bracket 4 is a bolt-to-nut relationship. However, the insertion end 41 of the bracket 4 is not necessarily provided with the function of a nut. There is no need, and this may simply be a screw receiver for the screw as the fastener 5.

  Other specific configurations of the respective parts are not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

The perspective view which shows the desk in one Embodiment of this invention. The principal part plane sectional drawing. The principal part disassembled perspective view which shows a top-plate main body and a side end member. The principal part disassembled perspective view which shows the attachment to the top plate of a bracket. The principal part side sectional drawing. The principal part disassembled perspective view which shows the attachment to the bracket of a wiring box. The principal part perspective view which shows the box main body and side wall of a wiring box. The principal part front sectional view which shows the attachment to the bracket of a wiring box. The principal part side sectional drawing. The perspective view which shows the usage example of the desk of the embodiment. The principal part side view which shows the attachment to the wiring box of a desktop panel. The principal part side view. The principal part plane sectional view which shows one of the modifications of this invention.

Explanation of symbols

D: Desk 1 ... Top plate 12 ... Side structure wall 3 ... Optional member (wiring box)
4 ... Bracket 5 ... Fastener (Bolt)

Claims (6)

An option member can be attached to a top plate having a side structure wall via a bracket,
Provided on the counter-use end side of the top plate is a bracket insertion port for communicating the internal space located on the inner surface side of the side structure wall to the outside,
The insertion end portion of the bracket inserted into the internal space through the bracket insertion port is fastened and fixed to the inner surface side of the side structure wall by a fastening member penetrating the side structure wall. Optional mounting structure. The optional attachment structure according to claim 1, wherein the fastener is a bolt, and a nut portion into which the bolt is screwed is provided at an insertion end portion of the bracket. A rear end member is mounted on the counter-use end side of the top plate, and the bracket insertion port is configured by punching a slot hole penetrating the rear end member in the front-rear direction.
The option mounting structure according to claim 1, wherein an openable / closable shutter for shielding the slot hole is provided on the rear end member. The option mounting structure according to claim 1, 2, or 3, wherein the bracket is provided with a wiring box supporting portion for supporting the wiring box as the optional member. The option mounting structure according to claim 1, wherein the bracket supports a desktop panel which is the optional member. Placing a second bracket on the outer surface side of the side structure wall;
Tighten and fix the bracket and the second bracket with the fastener,
The option mounting structure according to claim 1, 2, or 3, wherein separate option members are supported by the bracket and the second bracket, respectively.

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