JP2010099353A - Desk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a desk capable of preventing an article stored within a shelf body from sliding out when the desk is carried, and permitting easy cleaning within the shelf body. <P>SOLUTION: The desk is composed of side leg frames 3 disposed on the left and right sides, a top board 2 disposed above the side leg frames 3, and the shelf body 5 attached to the lower surface of the top board 2, having an opening in the front and capable of storing the article inside. The shelf body 5 has a load receiving board 5a with a mounting surface 5b on which the article is mounted. A protrusion strip 13 projecting upward from the mounting surface 5b and extending in the horizontal direction and dust-outlet parts 14 flush approximately with the mounting surface 5b are formed in the front side of the load receiving board 5a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes a side leg frame disposed on the left and right sides, a top plate disposed above the both side leg frames, and attached to a lower surface of the top plate, and has an opening on the front side to store articles therein. It is related with the desk comprised from the shelf main-body part which can be.

  In the conventional desk, the front side of the shelf main body part is formed with a ridge that extends in the left-right direction and protrudes upward, even if the desk is transported with the article stored in the shelf main body part, The article is locked to the ridges so as not to slide out of the shelf main body (see, for example, Patent Document 1).

Design Registration No. 11123377 (2nd page, BB cross-sectional view)

  However, in the desk described in Patent Document 1, it is convenient because the desk can be transported in a state where articles are stored in the shelf main body, but when cleaning dust etc. accumulated in the shelf main body, There is a problem that it is difficult to sweep out dust and the like by providing the ridges.

  The present invention has been made paying attention to such problems, and provides a desk that can prevent the articles stored in the shelf main body from slipping out during transport of the desk and can easily clean the inside of the shelf main body. The purpose is to do.

In order to solve the above-mentioned problem, the desk according to claim 1 of the present invention includes:
A side leg frame arranged on the left and right sides, a top plate arranged above the both side leg frames, and a shelf main body that is attached to the lower surface of the top plate and has an opening in the front and can store articles therein. A desk composed of parts,
The shelf main body portion has a load receiving plate on which a placement surface on which an article is placed is formed, and the front side portion of the load receiving plate protrudes upward from the placement surface to the left and right. A ridge extending in the direction and a sweeping portion that is substantially flush with the placement surface are formed.
According to this feature, when the desk is transported, the articles placed on the placing surface by the ridges can be locked so as not to slide out of the shelf main body, and when cleaning the shelf main body through the sweeping section. The dust accumulated in the unit can be swept out, and the inside of the shelf main body can be easily cleaned.

The desk according to claim 2 of the present invention is the desk according to claim 1,
The shelf main body has a shelf side plate extending upward from left and right of the load receiving plate, and the sweeping portion is formed between the left and right end portions of the ridge and the shelf side plate. It is characterized by being.
According to this feature, by collecting dust or the like accumulated in the shelf main body in either the left or right sweeping portion, dust or the like can be swept out on either the left or right side, and cleaning becomes easy.

The desk according to claim 3 of the present invention is the desk according to claim 1 or 2,
A rear inclined surface that slopes upward toward the front is formed at the rear of the ridge, and the rear inclined surface extends continuously from the mounting surface.
According to this feature, the article can be easily taken out by sliding the article placed on the placement surface forward so as to be in sliding contact with the rear inclined surface.

The desk according to claim 4 of the present invention is the desk according to any one of claims 1 to 3,
A front inclined surface that is inclined downward toward the front is formed at the front portion of the ridge, and a front end edge of the front inclined surface extends downward from the mounting surface. It is characterized by that.
According to this feature, even when the article contacts with the ridge when the article is stored in the shelf body, the article is slidably moved along the front inclined surface, so that the article is smoothly caught without being caught on the ridge. Can be stored in the shelf body, and the front end edge of the front inclined surface is disposed below the mounting surface, so that the front inclined surface can be formed wider and articles can be stored smoothly. Become.

  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 an overall image of a desk in an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing a desk. FIG. 4A is a side view showing a desk, FIG. 4A is a partially cutaway sectional view showing front end portions of a ground frame and a horizontal frame, and FIG. 4B is a sectional view taken along line AA in FIG. 5 is a perspective view showing the hook member, FIG. 6 is a plan view showing the desk with the top plate removed, and FIG. 7 is a cross-sectional view taken along line BB in FIG. 8 is a cross-sectional view taken along the line CC in FIG. 6, and FIG. 9 is a vertical side view showing the shelf main body. In the following description, the right side in FIG. 3 is the front side (front side) of the desk, and the lower side in FIG. 6 is the front side (front side) of the desk.

  Reference numeral 1 in FIG. 1 is a learning desk used by students mainly in educational institutions such as schools and cram schools. As shown in FIG. 1, this desk 1 supports a rectangular top plate 2 made of wood from below by side leg frames 3 made of metal materials arranged on the left and right.

  As shown in FIGS. 1 and 2, hook members 4 for suspending the baggage of the user of the desk 1 are provided on the left and right outside below the top plate 2. Between the left and right side leg frames 3, a shelf main body 5 is arranged with an opening in the front where a user can store an article such as a textbook used by a school or the like. The top plate 2 is attached to the bottom surface of the top plate 2 with its upper end surface in contact therewith.

  As shown in FIGS. 2 and 3, the left and right side leg frames 3 are configured by connecting upper ends of a rear leg frame 6 and a front leg frame 7 formed in a substantially L shape in a side view by an upper frame 8. Has been. The rear leg frame 6 includes a grounding frame 6a facing in the front-rear direction that is grounded on the floor surface, and a rear frame 6c extending upward from the rear end portion of the grounding frame 6a via a bent portion 6b. It is configured.

  A reinforcing frame 19 is provided between the rear frames 6c of the both side leg frames 3, and the left and right side leg frames 3 are integrally formed. Further, the side leg frame 3 is substantially U-shaped in a side view.

  The front leg frame 7 of the side leg frame 3 is formed with a horizontal frame 7a that is shorter than the grounding frame 6a and faces in the front-rear direction, and upward from a rear end portion of the horizontal frame 7a via a bent portion 7b. And a front frame 7c extending toward the front.

  As shown in FIG. 4 (b), the front leg frame 7 and the rear leg frame 6 are constituted by a pipe material as a tubular member made of a metal material having a hollow interior, and the front leg frame 7 and the rear leg frame are formed. The weight of the frame 6 is reduced.

  Further, the front leg frame 7 and the rear leg frame 6 are made of a tubular pipe material, so that deformation processing by pressing or the like is facilitated, and a recess 9 is formed in the front part of the grounding frame 6a from above. Is formed by being pressed. The recess 9 has inclined surfaces 9a, 9a from the left-right direction toward the center, and the recess 9 is formed in a substantially V shape in a cross-sectional view.

  In this recessed part 9, it arrange | positions in the state which made the lower part of the horizontal frame 7a contact | abut to inclined surface 9a, 9a from the upper direction. The ground frame 6a and the horizontal frame 7a are superposed and fixed in the recess 9 by welding. For example, as shown in the cross-sectional view of FIG. 4B, compared to the case where the ground frame 6a is not formed with the concave portion 9 and is welded by bringing a point on the bottom of the horizontal frame 7a into contact with the top of the ground frame 6a. By forming the recess 9 in the ground frame 6a and bringing the ground frame 6a and the horizontal frame 7a into contact at two points of the inclined surfaces 9a and 9a, the contact points between the ground frame 6a and the horizontal frame 7a are increased, The ground frame 6a and the horizontal frame 7a can be more firmly fixed.

  Further, by forming the recess 9 in the ground frame 6a, the height of the ground frame 6a and the horizontal frame 7a from the floor surface can be reduced, so that the user of the desk 1 can use the chair in front of the desk 1 as a chair. It is possible to prevent the user's foot from being caught by the horizontal frame 7a when sitting or standing.

  In addition, as shown to Fig.4 (a), the front-end part of the grounding frame 6a protrudes ahead from the front-end part of the horizontal frame 7a, and is arrange | positioned. The projecting dimension M at the front end of the ground frame 6a is about 2 to 4 cm.

  As shown in FIGS. 2 and 4A, a cover member 10 made of a resin material having elasticity for preventing the floor surface from being damaged is attached to the bent portion 6b of the ground frame 6a. Further, a cover member 11 made of a resin material having elasticity similar to the cover member 10 is attached to the front end portions of the ground frame 6a and the horizontal frame 7a from the front.

  As shown in FIG. 4B, the cover member 11 is formed in a substantially cylindrical shape that opens upward and rearward on the rear side, and is fitted on the front end portions of the ground frame 6a and the horizontal frame 7a. The front ends of the ground frame 6a and the horizontal frame 7a are covered. The cover member 10 conceals the welded portion 21 between the ground frame 6a and the horizontal frame 7a.

  Further, a screw hole 11a communicating with the top and bottom is formed in the lower part of the cover member 11, and a screwing hole 6d is formed in the lower part of the grounding frame 6a. The screw holes 11a and the screw holes 6d communicate with the cover member 11 attached to the front end portions of the ground frame 6a and the horizontal frame 7a. The screw holes 11a and the screw holes 6d communicate with each other. Thus, the cover member 11 is fixed to the ground frame 6a by screwing the screws 20 together. Although not specifically shown, screw holes and screw holes having the same configuration are also formed in the rear portions of the cover member 10 and the ground frame 6a, and screws are screwed into the screw holes from the screw holes. The cover member 10 is fixed to the ground frame 6a.

  The front portion of the cover member 11 is formed on a tapered surface 11b as an inclined portion in the present invention that is inclined upward and rearward along the front end portions of the ground frame 6a and the horizontal frame 7a. Therefore, even if the user's foot may come into contact with the front portion of the cover member 11, the user's foot slides upward along the tapered surface 11b, so that the foot is not caught by the cover member 11. The taper surface 11b can mitigate the impact when the foot and the cover member 11 come into contact with each other.

  As shown in FIGS. 2 and 3, the upper ends of the rear frame 6 c and the front frame 7 c are attached to the upper frame 8. As shown in FIG. 7, the upper frame 8 is provided with locking pieces 8b and 8b projecting downward from left and right ends of a horizontal plate-like substrate 8a facing in the front-rear direction. The substantially U-shaped concave strip portion 12 is formed. The rear frame 6c and the front frame 7c are inserted into the recess 12 from below and are welded to the lower surface of the substrate 8a. The upper surface of the substrate 8a of the upper frame 8 is formed as a horizontal horizontal plane.

  A plurality of frame side insertion holes 8 c are formed in the substrate 8 a of the upper frame 8. The lower end portions of the locking pieces 8b and 8b are folded upward to form a folded portion 8d, and the lower ends of the locking pieces 8b and 8b are rounded.

  As shown in FIG. 5, the hook member 4 is bent by a single wire made of metal. The hook member 4 is formed by bending a suspension portion 4a for suspending an article such as a user's bag and the upper end portion of the suspension portion 4a in a horizontal direction. And two horizontal portions 4 b engaged with the engagement holes 17.

  The horizontal portion 4b is constituted by both end portions of the above-described wire, and is spaced apart from the upper portion of the hook member 4. Therefore, the hook member 4 can be formed only by bending one wire, and the hook member 4 can be manufactured at low cost. Moreover, as shown in FIG. 8, the shape of the suspension part 4a is formed so that the inclination of the shelf side board 5c mentioned later of the shelf main-body part 5 may be followed. Further, the horizontal portion 4b extends in the left-right direction (outside of the desk 1) from the upper end portion of the suspension portion 4a.

  As shown in FIGS. 2 and 6, the shelf body 5 has a receiving plate 5 a whose upper surface is a placement surface 5 b for placing a user's article. Further, on the left and right sides of the load receiving plate 5a, shelf side plates 5c that are inclined upward and extend upward are provided. Furthermore, a back plate 5d extending upward from the rear portion of the cargo receiving plate 5a is provided. The shelf main body 5 is formed in a substantially box shape whose upper and front sides are opened by the load receiving plate 5a, the shelf side plate 5c, and the back plate 5d.

  A plurality of upper and lower communication holes 5e are formed in the rear part of the load receiving plate 5a, so that the weight of the shelf body 5 is reduced. In addition, a plurality of rib portions 5f facing in the left-right direction are provided on the lower surface of the load receiving plate 5a, and the strength of the shelf main body portion 5 is improved.

  Further, a convex strip 13 facing in the left-right direction is provided on the front side of the cargo receiving plate 5a so as to project upward. Between the left and right end portions of the ridges 13 and the left and right shelf side plates 5c, a sweeping portion 14 for sweeping out dust and the like accumulated in the shelf main body portion 5 to the outside of the shelf main body portion 5 is formed. . The sweeping portion 14 has a predetermined dimension of a left-right width L, and is formed at two left and right positions of the shelf body 5.

  Since the sweeping portion 14 is formed between the ridge 13 and the shelf side plate 5c, the user collects the dust accumulated in the shelf body 5 on one of the shelf side plates 5c, and then sweeps the dust. Dust can be removed to the shelf main body 5 side through the exit portion 14, and the inside of the shelf main body 5 can be easily cleaned. In addition, the left-right width dimension L of the sweep portion 14 is about 3 to 5 cm.

  As shown in FIG. 9, the ridge 13 is formed in a substantially triangular shape in a side view by bending the front side of the load receiving plate 5a upward and bending the tip downward. Has been. Therefore, the ridge 13 is formed with a rear inclined surface 13a inclined upward from the rear to the front at the rear of the ridge 13 with a substantially triangular apex as a boundary. A front inclined surface 13b that is inclined downward from the rear to the front is formed. The strength of the front side portion of the load receiving plate 5a is improved by the ridge 13 having such a shape.

  Furthermore, when the user tries to take out the article from the inside of the shelf main body 5, by sliding the article placed on the placing surface 5b forward so as to be in sliding contact with the rear inclined surface 13a, The article can be easily taken out. When the user tries to store the article in the shelf body 5, the article is pulled on the ridge 13 by moving the lower end of the article against the front inclined surface 13 b and sliding it. Articles can be smoothly stored in the shelf body 5 without being hung.

  As shown in FIG.6 and FIG.7, the rib-shaped shelf side part 15 extended toward the left-right outer side over the full length of the shelf side board 5c is provided in the upper end part of both the shelf side boards 5c. Further, as shown in FIGS. 7 and 9, a rib-shaped shelf rear portion 16 extending in the rear direction over the entire length of the back plate 5d is provided at the upper end portion of the back plate 5d. The shelf side portion 15 and the shelf rear portion 16 are formed so that the upper end portions thereof are flush with each other, and the shelf side portion 15 and the shelf rear portion 16 are in contact with the lower surface of the top plate 2 to support the top plate 2. It is supposed to be.

  The shelf side portion 15 extends from the upper end portion of the shelf side plate 5c toward the left and right outer sides, a contact plate 15a that contacts the lower surface of the top plate 2, and a contact plate from the left and right outer edges of the contact plate 15a. It is comprised from the side end plate 15b extended toward the downward direction over the full length of 15a. The shelf side portion 15 and the shelf side plate 5c form a downward U-shaped groove portion 15c facing in the front-rear direction at the lower portion of the shelf side portion 15.

  Further, as shown in FIGS. 6 and 8, the contact plate 15 a is provided with a plurality of shelf side portion insertion holes 15 d that are directed in the vertical direction in the front-rear direction. A pair of engagement holes 17 for engaging the horizontal portion 4b of the hook member 4 are formed in the left and right shelf side portions 15 at positions different from the shelf side portion insertion holes 15d.

  Further, the upper frame 8 of the side leg frame 3 can be fitted in the groove portion 15 c of the shelf side portion 15. Therefore, the movement of the upper frame 8 in the left-right direction is restricted within the groove 15c. Further, the upper frame 8 is slightly slid back and forth within the groove portion 15c so that the frame side insertion hole 8c and the shelf side portion insertion hole 15d can be easily aligned.

  As shown in FIG. 9, the shelf rear portion 16 includes a convex piece 16a that extends rearward from the upper end portion of the back plate 5d and is gently curved upward in a side view, and the convex piece 16a. And a vertical piece 16b extending upward from the rear end edge over the entire length. The rear shelf portion 16 and the back plate 5d form a substantially U-shaped hollow groove portion 16c that opens in the rearward portion 16 in the left-right direction.

  The shelf rear portion 16 has a sufficient strength for suppressing the bending generated at the rear portion of the shelf main body portion 5 by the vertical piece 16b and the convex piece 16a, and is formed with the lightening groove portion 16c. The shelf rear portion 16 is configured as a lightweight reinforcing portion. Further, the top plate 2 is supported not only from the left and right contact plates 15a but also from the lower side over the entire length of the upper end of the vertical piece 16b. It has become.

  To assemble the desk 1 configured as described above, first, turn over so that the bottom surface of the top plate 2 faces upward, the shelf body 5 on the bottom surface of the top plate 2, the shelf side portion 15 and the shelf rear portion 16 Place so as to abut. Then, after engaging the horizontal portion 4b of the hook member 4 from above with the engaging hole 17 of the shelf main body portion 5, the upper frame 8 is fitted into the groove portion 15c facing upward.

  By doing in this way, the contact plate 15a of the shelf side part 15 is clamped from the top and bottom by the top plate 2 and the upper frame 8, as shown in FIG. At the same time, the hook member 4 is also sandwiched from above and below by the top plate 2 and the upper frame 8 in the engagement hole 17. At this time, since the suspension portion 4a of the hook member 4 is disposed along the inclination of the shelf side plate 5c, the swinging of the suspension portion 4a toward the inner side of the desk 1 comes into contact with the shelf side plate 5c. As a result, it becomes possible to prevent large backlashes of the hanging portion 4a toward the inner side of the desk 1.

  Next, the upper frame 8 is slightly slid back and forth within the groove portion 15c to position the side leg frame 3 with respect to the top plate 2 so that the frame side insertion hole 8c and the shelf side portion insertion hole 15d communicate with each other. Do. After the position of the side leg frame 3 with respect to the top plate 2 is determined, the wood screws 18 are screwed into the top plate 2 through the frame side insertion holes 8c and the shelf side portion insertion holes 15d as shown in FIG. As a result, the side leg frame 3 and the shelf main body 5 are screwed to the top plate 2. In other words, the side leg frame 3 and the shelf main body 5 in the present embodiment need not be individually attached to the top plate 2, so that the assembly process of the desk 1 is simplified.

  At this time, when the side leg frame 3 and the shelf main body 5 are screwed to the top plate 2, the horizontal portion 4 b of the hook member 4 engaged in the engagement hole 17 is pressed from above and below. At the same time, the hook member 4 is firmly attached to the desk 1 by the frictional force generated from the vertical direction.

  In addition, as shown in FIG. 2, a reinforcing frame 19 is provided between the rear frames 6c of the both side leg frames 3 on the both side leg frames 3 to which the upper frame 8 is attached to the top plate 2. The strength in the left-right direction between the leg frames 3 on both sides can be improved, and rattling of the desk 1 in the left-right direction can be suppressed.

  As shown in FIG. 8, the desk 1 assembled as described above is provided with the concave strips 12 on the lower left and right sides of the top plate 2. After inserting a finger into the strip 12, the desk 1 can be lifted stably by placing the finger on the left and right engaging pieces 8b.

  When the user lifts the desk 1, the user hangs his / her finger on the locking piece 8b as described above, and at the same time, the user's finger also comes into contact with the folded portion 8d of the locking piece 8b. Since the folded portion 8d is formed in a rounded shape, the user can lift the desk 1 without feeling pain in the folded portion 8d.

  Further, when the user carries the desk 1 with his / her finger placed on the locking piece 8b, the locking piece 8b is in contact with the side end plate 15b from the inner surface side of the groove portion 15c. Since the load of the desk 1 received from the user's finger is also received by the side end plate 15b, the side end plate 15b is not deformed by the load of the desk 1 received by the locking piece 8b from the user's finger. The strength of the locking piece 8b can be improved.

  As described above, in the desk 1 according to the present embodiment, the shelf main body 5 has the load receiving plate 5a on which the placing surface 5b on which the article is placed is formed, and the load receiving plate 5a is placed on the front side. When the desk 1 is transported, the convex strips 13 projecting above the mounting surface 5b and extending in the left-right direction and the sweeping portion 14 substantially flush with the mounting surface 5b are formed. Articles placed on the placement surface 5b by the stripes 13 can be locked so as not to slide out of the shelf body 5 and dust collected in the shelf body 5 through the sweeping portion 14 during cleaning. Can be swept out, and the inside of the shelf body 5 can be easily cleaned.

  Moreover, the shelf main body 5 has a shelf side plate 5c extending upward from the left and right of the load receiving plate 5a, and the sweeping portion 14 is formed between the left and right ends of the ridge 13 and the shelf side plate 5c. By being formed in the middle, the dust and the like accumulated in the shelf body 5 can be collected on either the left or right sweeping portion 14 so that the dust or the like can be swept out on either the left or right side, making cleaning easier. .

  In addition, a rear inclined surface 13a that is inclined upward toward the front is formed at the rear portion of the ridge 13, and the rear inclined surface 13a is continuously extended from the mounting surface 5b, so that the mounting is performed. By sliding the article placed on the placement surface 5b forward so as to be in sliding contact with the rear inclined surface 13a, the article can be easily taken out.

  Moreover, the front part inclined surface 13b which inclines below toward the front is formed in the front part of the protruding item | line 13, and the front end edge of the front part inclined surface 13b faces below rather than the mounting surface 5b. Since the article is slidably moved along the front inclined surface 13b even if the article comes into contact with the ridge 13 when the article is stored in the shelf main body 5 by being extended, the article is ridged. The front inclined surface 13b can be smoothly accommodated in the shelf body 5 without being hooked on the front surface 13 and the front edge of the front inclined surface 13b is disposed below the mounting surface 5b, thereby widening the front inclined surface 13b. The article can be smoothly formed and stored.

  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 above embodiment, the desk 1 has been described as a desk used by students in educational institutions such as schools and cram schools, but the environment in which the desk is used is not particularly limited, such as an office desk or a learning desk used in the home. .

  Moreover, in the said Example, although the sweep part 14 was formed between the right-and-left end part of the protruding item | line 13 and the left-right shelf side board 5c, the place where the sweeping part 14 is formed is not only the right and left of the protruding item | line 13, For example, two ridges that are linearly spaced apart from each other on the front side of the cargo receiving plate 5a may be formed, and one sweeping portion may be formed between the ridges.

  Moreover, in the said Example, although the engagement hole 17 was formed so that it might make a pair with two strips, you may form as one engagement hole 17 which can accommodate the two horizontal parts 4b of the hook member 4. FIG.

It is a perspective view which shows the whole image of the desk in the Example of this invention. It is a disassembled perspective view which shows a desk. It is a side view which shows a desk. (A) is a partially broken sectional view which shows the front-end part of a grounding frame and a horizontal frame, (b) is AA sectional drawing in FIG. It is a perspective view which shows a hook member. It is a top view which shows the desk of the state which removed the top plate. It is BB sectional drawing in FIG. It is CC sectional drawing in FIG. It is a vertical side view which shows a shelf main-body part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Desk 2 Top plate 3 Side leg frame 4 Hook member 4a Hanging part 4b Horizontal part 5 Shelf main-body part 5a Load receiving plate 5b Mounting surface 5c Shelf side board 5d Back board 6 Rear leg frame 6a Grounding frame 6c Rear frame 7 Front leg frame 7a Horizontal frame 7c Front frame 8 Upper frame 8b Locking piece 8d Folding part 9 Recess 10, 11 Cover member 11b Tapered surface (inclined part)
12 Concave ridge 13 Convex ridge 13a Rear inclined surface 13b Front inclined surface 14 Sweep portion 15 Shelf side portion 15c Groove portion 16 Shelf rear portion 17 Engagement hole

Claims (4)

A side leg frame arranged on the left and right sides, a top plate arranged above the both side leg frames, and a shelf main body that is attached to the lower surface of the top plate and has an opening in the front and can store articles therein. A desk composed of parts,
The shelf main body portion has a load receiving plate on which a placement surface on which an article is placed is formed, and the front side portion of the load receiving plate protrudes upward from the placement surface to the left and right. A desk characterized in that a ridge extending in a direction and a sweeping portion that is substantially flush with the placement surface are formed.   The shelf main body has a shelf side plate extending upward from the left and right of the load receiving plate, and the sweeping portion is formed between the left and right end portions of the ridge and the shelf side plate. The desk according to claim 1, wherein:   The rear portion of the ridge is formed with a rear inclined surface that is inclined upward toward the front, and the rear inclined surface is continuously extended from the mounting surface. The desk according to 1 or 2.   A front inclined surface that is inclined downward toward the front is formed at the front portion of the ridge, and a front end edge of the front inclined surface extends downward from the mounting surface. The desk according to any one of claims 1 to 3, characterized in that:

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