JP2007202910A - Desk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a desk capable of raising support strength in an upper horizontal rod having an attachment part for attaching an option member, and performing arrangement with excellent outer appearance. <P>SOLUTION: The desk has a top plate which is disposed at a position lower than the upper end part of a rear surface board 3 in a space enclosed by a pair of right and left side surface boards 2 and the rear surface board 3. The upper horizontal rod 5 having the attachment part 16 for attaching the option member on at least the front surface is arranged at the upper end part of the rear surface board 3 in the right and left direction. A groove line 28 to be fitted to a projection line 27 projecting at the upper end part of the rear surface part 3 is formed on the lower surface of the upper horizontal rod 5. A reception hole 29, to which projection pieces 22 projecting at the upper part of the inner side surface of each side surface board 2 so as to be mutually opposed are inserted, is formed on the right and left side end surfaces of the upper horizontal rod 5. The projection pieces 22 inserted into the reception hole 29 and the upper horizontal rod 5 are fixed by fixing members 31 which are put through from the front surface or rear surface side of the upper horizontal rod 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a desk that can be used as a personal booth used for browsing books in a library, lectures using audiovisual equipment, and the like.

  Conventionally, as this type of desk, for example, the upper portions of the columns that are erected on the left and right on the top plate are connected to each other by a horizontal connecting rod, and the upper and lower ends of the main partition plate facing the left and right direction are connected to the horizontal connecting rod. A side partition plate that fits into a groove formed on the lower surface and a groove formed on the top plate and stands upright on the top plate, and that faces in the front-rear direction at the left and right end portions and the middle portion of the main partition plate While fitting the middle part of the front and rear direction, sandwiching the front and rear ends with a holder fixed on the top plate and standing on the top plate, partitioning the top plate in the left and right direction, There is an arrangement in which locking pieces facing each other are provided on the upper and lower surfaces of the front and rear surfaces of the horizontal connecting rod so that a lighting fixture or the like (device) can be attached using the locking pieces (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-131195 (page 3, FIG. 5)

  However, in the desk described in Patent Document 1, a screw is screwed in from the upper outer side of the column that is erected on the left and right sides on the top plate to connect the lateral connection rod, so that the screw is exposed to the outside after the connection. For this reason, a cover for concealing this is attached, which causes a problem that the structure of the support becomes complicated and the manufacturing cost increases. In addition, the upper end of the main partition plate is fitted to the lower surface of the horizontal connection rod. However, the main partition plate is weak because the lower end is only fitted to the groove formed on the top plate. Since the kite is mainly supported by the left and right columns, for example, when heavy equipment is attached to the horizontal coupling rod, sufficient support strength cannot be obtained with only the left and right columns installed on the top plate. There was a fear.

  The present invention has been made paying attention to such problems, and provides a desk that can improve the support strength of the upper reed provided with an attachment portion for attaching an optional member and can be arranged with a good appearance. The purpose is to do.

In order to solve the above-mentioned problem, the desk according to claim 1 of the present invention includes:
From a pair of left and right side plates, a back plate lower than the side plates connecting the opposing inner sides of the side plates, and an upper end portion of the back plate in a space surrounded by the side plates and the back plate Is a desk composed of a top plate erected in a lower position,
At the upper end of the back plate, an upper reed is provided in the left-right direction with at least a front mounting portion for attaching an optional member. The lower surface of the upper reed protrudes from the upper end of the back plate. Grooves are formed to be fitted to the provided ridges, and projecting pieces are provided on the left and right side end surfaces of the upper lateral ribs so as to face each other on the upper inner side surfaces of the both side plates. A receiving hole is formed, and the projecting piece inserted into the receiving hole and the upper recumbent are fixed by a fixing member inserted from the front side or the back side of the upper recumbent It is characterized by.
According to this feature, the left and right side plates that cover the left and right side surfaces on the top plate and the back plate that covers the back surface are made of a high-strength plate material that lays the top plate at a predetermined height position. By being supported by these left and right side plates and the back plate, for example, even when heavy equipment is attached to the mounting part, the load applied to the upper reed is distributed to the left and right side plates and the back plate. In addition, since the back plate and the left and right side plates are connected by the upper reed, the bonding strength between the left and right side plates and the back plate is effectively increased, so that a desk with high rigidity can be provided. In addition, by fixing the projecting piece inserted in the receiving hole of the upper recumbent with a fastening member inserted from the front side or the back side of the upper recumbent, and connecting the upper recumbent and both side plates, Since the screws and the like are not exposed on the outer surface of the side plate, the appearance of the desk is also improved.

The desk according to claim 2 of the present invention is the desk according to claim 1,
The projecting piece is provided separately from the side plate, and is projected from a side surface of a support plate attached to the inner side surface of the side plate, and the support plate is substantially the same as the shape of the side end surface of the upper reed. It has the same shape and is sandwiched between the side plate and the side end surface of the upper reed.
According to this feature, the projecting piece can be easily provided on the upper part of the inner side surface of the side plate without complicating the structure of the side plate. In addition, the screws or the like for attaching the support plate are concealed by the upper recumbent and do not protrude greatly from the upper recumbent, so that it is less noticeable with respect to the upper recumbent.

The desk according to claim 3 of the present invention is the desk according to claim 1 or 2,
The mounting portion is composed of a mounting groove extending in the left-right direction that is recessed in at least the front surface of the upper reed, and a locking piece that protrudes inward from the upper and lower ends of the mounting groove. And the attachment hole of the fastening member is formed in the attachment groove.
According to this feature, the fastening member attached to the attachment hole is disposed in the attachment groove covered with the upper and lower locking pieces and is difficult to see from the outside, so that the appearance is good.

The desk according to claim 4 of the present invention is the desk according to claim 2 or 3,
The lower end of the support plate is formed with a notch portion into which the protrusion is fitted.
According to this feature, the load applied to the support plate is dispersed by the fitting action of the protrusions and the notches, and therefore, for example, the load applied to the support plate causes the mounting strength of the support plate to the side plate. In addition to preventing the plate from weakening, the support plate can be positioned by fitting the protrusions of the back plate to the notches of the support plate when the support plate is attached to the side plate.

The desk according to claim 5 of the present invention is the desk according to any one of claims 1 to 4,
The groove and the receiving hole communicate with each other in the vertical direction.
According to this feature, in a state where both side plates are joined to the left and right ends of the back plate, the upper reed can be disposed on the upper end portion of the back plate simply by inserting the upper reed between the both side plates from above. Therefore, it is possible to easily assemble the desk.

  The best mode for carrying out a desk according to the present invention will be described below based on an embodiment.

  An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is a perspective view showing a desk in the embodiment, FIG. 2 is a front view showing the desk, and FIG. 3 is a plan view showing the desk. 4 is an AA longitudinal side view showing the desk in FIG. 3, FIG. 5 is an exploded perspective view showing the mounting structure of the upper recumbent, and FIG. 6 is the mounting structure of the upper recumbent. 7 is a BB cross-sectional plan view showing the upper recumbent in FIG. 6, and FIG. 8 is a CC vertical side view showing the upper recumbent in FIG. 9 is a perspective view showing a desk in a modified example. In the following description, the lower side of the paper in FIGS. 3 and 7 is the front side of the desk, and the left side of the paper in FIGS. 4 and 8 is the front side of the desk.

  Reference numeral 1 in FIG. 1 is a desk that can be used as a personal booth used for reading books in a library or in lectures using audiovisual equipment. The desk 1 has a pair of left and right side plates 2 erected on the floor and a back erected on the floor and arranged to connect the rear inner side surfaces of the left and right side plates 2 and 2 together. A top plate 4 installed at a position lower than the upper end portion of the back plate 3 in a space (see FIG. 3) formed in a U-shape in plan view formed by the side plates 2, 2 and the back plate 3; , Is composed of. Both side plates 2, 2, back plate 3, and top plate 4 are made of wooden plywood.

  As shown in FIGS. 2 and 3, the back plate 3 is configured to be lower than the left and right side plates 2 and 2, and a metal upper reed 5 having a longitudinal direction in the left-right direction is arranged at the upper end portion thereof. It is installed. A liquid crystal monitor 6 as an example of an optional member is attached to the front side of the upper reed 5. Note that the optional members include not only the liquid crystal monitor 6 but also electronic equipment such as lighting equipment and furniture such as shelves. Further, a metal reinforcing square tube 7 is attached to the lower surface side of the top plate 4 to prevent bending, and the left and right ends of the reinforcing square tube 7 are screwed to the side plates 2 and 2. And the top plate 4 is supported.

  As shown in FIG. 4, a wiring duct 8 is attached to a position below the top plate 4 in front of the back plate 3, and a wiring groove 9 covered with a cover body 9 a is also formed on the inner surface of the side plate 2. It is formed (see FIG. 1). In addition, a wiring hole 10 is formed in the rear part of the top plate 4 so as to penetrate from the lower surface side to the upper surface side of the top plate 4, and the upper surface opening of the wiring hole 10 is covered with a cover body 10a. Although not particularly illustrated, a wiring tube communicating with the inside of the wiring groove 9 extends in the vertical direction inside the side plate 2, and an opening 11 at the top of the wiring tube is formed above the side plate 2. In the vicinity of the upper reed 5 (see FIG. 1). Using these wiring duct 8, wiring groove 9, wiring hole 10 and wiring pipe (not shown), optional members such as devices arranged on the top plate 4 and the liquid crystal monitor 6 attached to the upper horizontal plane 5 Power cords, communication cables, etc. that extend from can be wired nicely.

  As shown in FIG. 6, a plurality of demon nuts 12 are inserted at the joining positions of the back plate 3 and the top plate 4 on the inner side surfaces of the side plates 2 and 2, and screwed into the demon nuts 12. The bolt 13 is protruded inward from the inner surface of the side plate 2. On the other hand, as shown in FIG. 4, a plurality of dowel holes 14 into which bolts 13 attached to the side plate 2 are inserted are formed on the side edges of the back plate 3 and the top plate 4. A knock-down fitting 15 is arranged at the back of each dowel hole 14, and the knock-down fitting 15 is rotated halfway with a tool such as a screwdriver while the head of the bolt 13 is inserted into the knock-down fitting 15. By doing so, the head of the bolt 13 is locked and the deviation from the dowel hole 14 is prevented (see FIG. 6). That is, the heads of the bolts 13 inserted into the dowel holes 14 are locked by the knock-down fitting 15, so that the side plates 2, 2, the back plate 3 and the top plate 4 are joined.

  The upper reed 5 is formed to have an end dimension slightly longer than the longitudinal width of the back plate 3 and has a rectangular shape in cross-section as shown in FIG. 5. The mounting grooves 16, 16 are recessed along the longitudinal direction. From the upper and lower ends of the opening of each mounting groove 16, as shown in FIG. 8 in particular, locking pieces 17, 17 having a substantially L shape in a side view are provided so as to face each other. By locking the locking claw 19 formed on the rear surface of the monitor support 18 provided on the back side of the liquid crystal monitor 6 to the piece 17, the liquid crystal monitor 6 can be attached to the upper reed 5. Yes.

  In other words, on the front and back surfaces of the upper reed 5, an attachment portion comprising an attachment groove 16 having an engagement piece 17 that can engage an engagement claw 19 that is an attachment member for attaching an optional member such as the liquid crystal monitor 6. In particular, since the locking piece 17 and the mounting groove 16 as the mounting portion are extended in the longitudinal direction, the optional member can be mounted at an arbitrary position in the left-right direction. In particular, the upper reed 5 in this embodiment is formed by extrusion molding, and the locking piece 17 and the mounting groove 16 are integrally formed when the upper reed 5 is formed. Note that, although the mounting portion is provided on the front surface and the back surface of the upper reed 5 of the present embodiment, it may be provided at least on the front surface.

  On the lower surface of the upper horizontal bar 5, a groove 28 is formed in the longitudinal direction in which a protrusion 27 projecting in the longitudinal direction of the back plate 3 is fitted at a substantially central portion in the front-rear direction on the upper end surface of the back plate 3. 8 (see FIG. 8), the protrusions 27 of the back plate 3 erected on the floor surface are fitted into the grooves 28 of the upper reed 5 so that the front reed 5 Shaking is prevented.

  Further, as shown in FIGS. 2 and 3, the upper horizontal bar 5 is attached to the side plates 2, 2 via metal mounting brackets 20, 20 attached to the inner side surfaces of the left and right side plates 2, 2. As shown in FIG. 5, the mounting bracket 20 has a support plate 21 that has substantially the same shape as the side end surface of the upper recumbent rib 5, and protrudes from the substantially central side surface of the support plate 21 toward the upper recumbent 5 side. And a projecting piece 22 welded to the support plate 21 so as to be provided.

  Through holes 24 into which screws 23 are inserted are formed at the four corners of the support plate 21, and the screws 23 inserted through the through holes 24 are fastened to the upper part of the inner side surface of the side plate 2, so that the mounting bracket 20 is fixed to the side plate 2, and the projecting piece 22 is provided in a state of projecting inward from the inner side surface of the side plate 2, and the left and right end surfaces of the back plate 3 are connected to the side plate 2 at the lower end of the support plate 21. 2 is formed with a notch 26 into which the protrusion 27 of the back plate 3 is fitted, thereby preventing rattling of the upper end of the back plate 3 in the front-rear direction. It has become so. Further, a screw hole 25 into which a screw 31 as a fastening member described later is screwed is formed at the top and bottom of the tip of the protrusion piece 22.

  When assembling the desk 1, when attaching the mounting bracket 20 to the side plate 2, the notch 26 of the support plate 21 of the mounting bracket 20 is formed on the protrusion 27 of the back plate 3 already joined to the side plate 2. By fitting, the mounting position of the mounting bracket 20 can be easily determined. Further, the thickness width dimension in the front-rear direction of the projecting piece 22 of the mounting bracket 20 is formed slightly shorter than the front-rear width dimension of the opening 28 of the groove 28 of the upper horizontal rib 5 described above. It can be inserted into the strip 28 from below.

  The upper reed 5 in this embodiment is formed by extrusion molding as described above, and as shown in FIGS. 7 and 8, a pair of upper and lower mounting grooves 16, 16 are provided in the longitudinal direction on the front side and the back side. In addition, a space 29 extending in the vertical width direction is formed between the front and rear mounting grooves 16 and 16 over the longitudinal direction. A pair of upper and lower connecting pieces 32, 32 (see FIG. 5) are formed in the space 29 in the longitudinal direction, and the lower space of the lower connecting piece 32 in the space 29 has the groove 28 described above. Forming.

  6 and 7, the left and right ends in the longitudinal direction of the pair of upper and lower connecting pieces 32, 32 are notched and are located on the inner side of the left and right ends in the longitudinal direction of the upper reed 5. Thus, the receiving holes 33 having a depth into which the protruding pieces 22 of the mounting bracket 20 can be inserted are formed at the left and right end portions of the space portion 29.

  Thus, the groove 28 is formed in the lower part of the space part 29 formed over the up-and-down width direction in the upper horizontal rib 5, and the receiving hole 33 is formed in the left and right end parts of the space part 29, so that the groove line is formed. 28 and the receiving hole 33 communicate with each other in the vertical direction, so that when the desk 1 is assembled as will be described later, the upper reed 5 can be inserted between the left and right side plates 2 and 2 from above. ing.

  In this embodiment, the groove 28 is formed in the lower part of the space 29 and the receiving holes 33 are formed in the left and right ends of the space 29. However, the space 29 is formed. Without this, the upper horizontal bar 5 may be separately provided with a receiving hole having a depth into which the protruding piece 22 can be inserted and a groove into which the protruding line 27 can be fitted.

  Further, the inner wall 16a of the mounting groove 16 formed on the back side of the upper horizontal rib 5, that is, the inner wall 16a disposed so as to partition the space portion 29 and the mounting groove 16 on the back side, penetrates in the front-rear direction. A mounting hole 30 is formed at a position corresponding to the screw hole 25 of the projecting piece 22 inserted into the space 29.

  Therefore, with the openings 22 at the left and right ends of the space portion 29, that is, with the protrusions 22 inserted into the receiving holes 33, screws 31 as fastening members are attached to the attachment holes 30 from the back side of the upper horizontal cage 5, By screwing into the screw hole 25 of the inserted protrusion 22, the upper horizontal bar 5 and the mounting bracket 20, that is, the upper horizontal bar 5 and the side plate 2 are connected. At this time, since the head of the screw 31 inserted through the attachment hole 30 is disposed on the inner wall 16a of the attachment groove 16 on the back side, the screw 31 is not exposed to the front side of the desk 1. Even from the back side, it becomes difficult to see from the back side (outside side) by the locking pieces 17 arranged above and below the mounting groove 16, so that the appearance of the desk 1 is improved.

  In this way, the support plate 21 of the mounting bracket 20 formed separately from the side plate 2 is screwed to the upper part of the inner side surface of the side plate 2 so that the protruding piece 22 can be easily formed on the upper inner side surface of the side plate 2. Since it can be provided, the structure of the side plate 2 is not complicated. In this embodiment, the projecting piece 22 is fixed to the inner wall 16a in the mounting groove 16 on the back side, but may be fixed to the inner wall of the mounting groove 16 on the front side.

  Further, since the shape of the support plate 21 is substantially the same as the shape of the side end face of the upper reed 5, the inner surface of the side plate 2 and the upper reed 5 are connected in the connected state shown in FIGS. 6 and 7. Since the support plate 21 is sandwiched between the side end surfaces, and the screws 23 and the like for attaching the support plate 21 are thereby concealed by the upper recumbent rib 5 and do not protrude significantly from the outer surface of the upper recumbent rib 5. Less prominent against the upper recumbent.

  In addition, the support plate 21 of the mounting bracket 20 is formed with a notch 26 in which the left and right ends of the protrusions 27 formed on the back plate 3 are fitted, so that the screw 23 of the mounting bracket 20 Since this load is dispersed by the fitting action of the protrusion 27 and the notch portion 26, for example, the load 23 applied to the mounting bracket 20 is prevented from loosening the screw 23 to weaken the mounting strength to the side plates 2 and 2. Is done.

  In order to assemble the desk 1 configured as described above, the bolts 13 of the left and right side plates 2 and 2 are first fitted into the dowel holes 14 formed in the back plate 3 and the top plate 4, and the bolts are inserted via the knock-down fitting 15. By locking 13, the side plates 2, 2, the back plate 3 and the top plate 4 are joined. Next, the mounting bracket 20 is attached to the inner surface side of the side plate 2. Specifically, the notch 26 of the support plate 21 of the mounting bracket 20 is fitted to the protrusion 27 of the back plate 3 already joined to the side plate 2, so that the mounting bracket 20 can be positioned with respect to the side plate 2. Therefore, the mounting bracket 20 can be mounted at an accurate position on the inner surface of the side plate 2.

  Since the left and right end portions of the groove 28 and the receiving holes 33, 33 communicate with each other in the vertical direction as described above, the upper reed 5 is inserted between the inner side surfaces of the side plates 2, 2 from above. The protrusions 27 of the back plate 3 are fitted into the grooves 28 of the upper horizontal bar 5, and the protruding pieces 22, 22 are fitted into the left and right receiving holes 33, so that the upper horizontal bar 5 is attached to the rear plate 3. It can be easily arranged at the upper end. Next, screws 31 are inserted into the mounting holes 30 from the back side, and screwed into the screw holes 25 of the projecting pieces 22 inserted into the space 29 to be fastened. 5 is firmly joined.

  As described above, the groove 28 and the receiving hole 33 of the upper horizontal rib 5 are communicated in the vertical direction, and the projecting pieces 22 and 22 are provided on the inner side surfaces of the both side plates 2 and 2. It can be simply arranged between the face plates 2 and 2 simply by inserting from above. Even before the screw 31 is screwed onto the projecting piece 22, the left and right ends and the lower part of the upper horizontal bar 5 are supported by the projecting piece 22 and the projecting ridge 27, so that the assembly work of the desk 1 is extremely easy. become.

  As described above, according to the desk 1 as an embodiment of the present invention, the left and right side plates 2 and 2 covering the left and right side surfaces on the top plate 4 and the back plate 3 covering the back surface are erected from the floor surface. The top plate 4 extends upward from the top plate 4 and is composed of a high-strength plate material that lays the top plate 4 at a predetermined height. The upper horizontal plate 5 is formed by the left and right side plates 2 and 2 and the back plate 3. By being supported, even when heavy equipment or shelves are locked to the locking pieces 17 of the mounting grooves 16, the load applied to the upper horizontal rib 5 is distributed to the left and right side plates 2 and 2 and the back plate 3. Therefore, not only can these optional members be supported stably, but the back plate 3 and the left and right side plates 2 and 2 are connected by the metal upper side plate 5 so that the left and right side plates 2 and 2 are connected to the back. Since the bonding strength with the face plate 3 is also effectively increased, a desk with high rigidity can be provided.

  Further, the left and right end openings of the upper horizontal bar 5, that is, the projecting pieces 22 inserted into the receiving holes 33 are fastened with screws 31 inserted from the back side of the upper horizontal bar 5, and the upper horizontal bar 5 and both side plates 2 are fixed. , 2, there is no need to screw the back plate 3 from the outer surface of the side plates 2, 2, so that the screws are not exposed to the outer surface of the side plates 2, 2, and the desk looks great Is effectively improved.

  Further, the left and right end openings of the projecting piece 22 and the receiving hole 33 into which the projecting piece 22 can be inserted have a width that is more than half of the upper and lower width of the entire upper horizontal gutter 5, and the upper and lower sides of the projecting piece 22 are screwed. Therefore, the supporting force against the load applied in the longitudinal rotation direction of the upper reed 5 is effectively increased.

  In addition, as shown in FIG. 8, the electric cable 34 extended from equipments, such as the liquid crystal monitor 6, is wired in the attachment groove 16 of the upper reed 5 and it is electrically connected by the locking piece 17 of the attachment groove 16. Since it becomes difficult to see the cable 34 from the front side (outside side), it can be wired with good appearance.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the said Example, the desk 1 comprised independently for 1 person was applied as a desk of this invention, but the said desk 1 is changed like the desk 1 'as a modification shown in FIG. The desk 1 'that can be used by a plurality of users by being provided in the left-right direction and the front-rear direction can also be applied.

  This desk 1 'shares the side plate disposed between the top plates 4 and 4 adjacent in the left-right direction with the single side plate 2', and between the top plates 4 and 4 adjacent in the front-rear direction. The back plate arranged on the same side is shared by one back plate 3 ', and the upper side is also shared by one upper side 5', but each booth, that is, each top plate Since the periphery of 4 is configured as a desk surrounded by the back plate 3 ′ and the left and right side plates 2 ′ and 2 ′, it constitutes the desk of the present invention.

  Moreover, in the said Example, although the screw 31 was applied as a fastening member which fastens the protrusion piece 22, if it can prevent the deviation of the protrusion piece 22 from the receiving hole 33, for example, a locking pin etc. It may be.

  Further, if the front and rear width (plate thickness) of the projecting piece 22 is substantially the same as the front and rear width of the receiving hole 33 (front and rear width of the space portion 29), the projecting piece 22 is fitted into the receiving hole 33. The support strength of the upper reed 5 by the projecting piece 22 can be increased more effectively.

It is a perspective view which shows the desk in an Example. It is a front view which shows a desk. It is a top view which shows a desk. It is an AA vertical side view which shows the desk in FIG. It is a disassembled perspective view which shows the attachment structure of an upper recumbent. It is a front view which shows the attachment structure of an upper recumbent. It is a BB cross-sectional top view which shows the upper recumbent in FIG. It is CC longitudinal cross-sectional side view which shows the upper recumbent in FIG. It is a perspective view which shows the desk as a modification.

Explanation of symbols

1, 1 'Desk 2 Side plate 3 Back plate 4 Top plate 5 Upper horizontal plate 6 LCD monitor (optional member)
16 Mounting groove (Mounting part)
17 Locking piece (mounting part)
18 Monitor Support 19 Locking Claw 20 Mounting Bracket 21 Support Plate 22 Projection Piece 23 Screw 24 Through Hole 25 Screw Hole 26 Notch 27 Projection 28 Groove 29 Space (Groove, Receiving Hole)
30 Mounting hole 31 Screw (fastening member)
33 receiving hole

Claims (5)

From a pair of left and right side plates, a back plate lower than the side plates connecting the opposing inner sides of the side plates, and an upper end portion of the back plate in a space surrounded by the side plates and the back plate Is a desk composed of a top plate erected in a lower position,
At the upper end of the back plate, an upper reed is provided in the left-right direction with at least a front mounting portion for attaching an optional member. The lower surface of the upper reed protrudes from the upper end of the back plate. Grooves are formed to be fitted to the provided ridges, and projecting pieces are provided on the left and right side end surfaces of the upper lateral ribs so as to face each other on the upper inner side surfaces of the both side plates. A receiving hole is formed, and the projecting piece inserted into the receiving hole and the upper recumbent are fixed by a fixing member inserted from the front side or the back side of the upper recumbent A desk characterized by.   The projecting piece is provided separately from the side plate, and is projected from a side surface of a support plate attached to the inner side surface of the side plate, and the support plate is substantially the same as the shape of the side end surface of the upper reed. The desk according to claim 1, wherein the desk has the same shape and is sandwiched between the side plate and a side end surface of the upper recumbent.   The mounting portion is composed of a mounting groove extending in the left-right direction that is recessed in at least the front surface of the upper reed, and a locking piece that protrudes inward from the upper and lower ends of the opening of the mounting groove. The desk according to claim 1, wherein a mounting hole for the fastening member is formed in the mounting groove.   The desk according to claim 2 or 3, wherein a notch portion into which the protrusion is fitted is formed at a lower end of the support plate.   The desk according to any one of claims 1 to 4, wherein the groove and the receiving hole communicate with each other in a vertical direction.

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