JP3513431B2 - Desk with shelf - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly used as a learning desk with a bookshelf.
The present invention relates to a desk with a shelf that includes a removable lower shelf that is disposed on the rear side of the top surface of the desk body, and a removable upper shelf that is disposed above the lower shelf.

[0002]

2. Description of the Related Art In this type of desk with shelves, the lower and upper shelves arranged on the top surface of the top of the desk body can be freely attached and detached. Compared with the case where it is integrally formed, not only can it be handled easily during assembly and transportation, but also the learning work form changes with the growth of the user, or the preference and usability of the desktop form. A first usage pattern in which the lower shelf and the upper shelf are arranged on the top surface of the desk body by changing the combination of the desk body and the lower shelf and the upper shelf according to changes, etc. It can be changed to a second usage pattern in which only the lower shelf is provided on the top surface of the table top, and a third usage pattern in which both the lower shelf and the upper shelf are removed from the top surface of the desk body. Can be diversified. In the conventional desk with shelves, the left and right maximum lengths of the upper shelves are configured such that they can be placed in the back side of the knee insertion space of the desk body and arranged, and on the inner surface facing the knee insertion space of the desk body. Was configured by providing a support tool for supporting the upper shelf in a horizontal posture along the left-right direction (for example,
(See Japanese Patent Laid-Open No. 8-66244).

[0003]

In this conventional desk with shelves, the upper shelf removed along with the change from the first usage pattern to the second usage pattern or the third usage pattern is used as it is as the knee of the desk body. By supporting it in the horizontal position on the back side of the storage space,
Since the upper shelf can be reused as a storage shelf,
There is an advantage that it is not necessary to discard the upper shelf that is removed from the desk when the usage pattern is changed, and waste of resources can be suppressed. However, since the upper shelf is installed in the knee rest space of the desk body as it is, the maximum left-right length of the upper shelf is set to be slightly smaller than the distance between the opposite faces of the both side plates of the desk body forming the knee rest space in the left-right direction. It is necessary to make it smaller, and moreover, the same as the same dimension, the left and right maximum length of the lower shelf must be made smaller than the distance between the facing surfaces of the both side plates of the desk body in the left-right direction. As a result, it becomes a big constraint on the form of the desk body and the lower shelf and the upper shelf,
Since the upper shelf is reused only for the storage shelf in the knee rest space of the desk body, there is no choice for the user.

Further, as a method of solving the above-mentioned conventional inconvenience, the present inventor has developed a desk with a shelf as shown in FIGS. 14 to 16. The upper shelf C of this desk with shelf
A pair of left and right shelf side plates 20, a back plate 21 that fixedly connects both shelf side plates 20, and a single book stand that is detachably fixedly connected between both shelf side plates 20 and that can be placed and used independently. 50, and the maximum left-right length W5 of the book stand 50 is set to a size such that it can be placed in the back side of the knee rest space S of the desk body A.

The book stand 50 includes a pair of left and right outer plates 50.
A, a rear plate 50B fixedly connected to the rear end portions of both outer plates 50A, a front plate 50C as front legs fixedly connected to the front end portions of both outer plate 50A, and three of them. A desk plate 50D fixedly connected in a horizontal posture across 50A, 50B and 50C
It is configured such that it can be placed and used alone on the top surface of the top plate 1 or the like.

In the desk body A, the knee rest space S
The plate thicknesses t1 of the side plates 2 that face each other in the left-right direction across the
The plate thickness t2 of both shelf side plates 20 of the upper shelf C is configured to be the same or substantially the same size, and both side plates 2 of the desk body A are configured.
The outer surface spacing W1 in the left-right direction and both side plates 2 of the upper shelf C
The outer surface distance W2 in the left-right direction of 0 is configured to have the same or substantially the same size, and further, the facing surface distance W3 in the left-right direction of both side plates 2 of the desk body A and both shelf side plates 20 of the upper shelf C are set. And the opposing surface spacing W4 in the left-right direction of the book stand 50 disassembled from the upper shelf C by configuring the same or substantially the same size that is slightly larger than the left-right maximum length W5 of the book stand,
It is constructed so that it can be freely inserted and placed between both side plates 2 of the desk body A. On each outer side plate 50A of the book stand 50, a bolt 5 that is screwed and fixed to a nut member embedded in the shelf side plate 20 of the upper shelf C and a nut member 51 embedded in the side plate 2 of the desk body A.
Shelf plate 5 for mounting and supporting book stand 50 at a position on the back side of knee rest space S across both side plates 2 and back plate 3 of desk body A while having mounting holes formed therethrough.
3 is attached. The upper shelf C may include at least a pair of left and right shelf side plates 20 and a single book stand 50 that can be placed and used independently. The configuration of the lower shelf B is substantially the same as that of the lower shelf B of the first embodiment described later, and the same components are denoted by the same reference numerals and the description thereof will be omitted.

In the case of this desk with shelves, the space W2 between the opposite side surfaces of both shelf side plates 20 of the upper shelf C and the desk body A in the left-right direction.
Although the outer surface distance W1 of the both side plates 2 in the left-right direction is integrally configured to have the same or substantially the same size, the first and second usage patterns are removed in accordance with a change from the second usage pattern to the third usage pattern. In the upper shelf C, not only can the book stand 50 separated from both shelf side plates 20 be supported on the back side of the knee rest space S of the desk body A, but also the book stand 50 can be supported by the top plate 1 of the desk body A. It can also be used by placing it alone on the upper surface.

[0008] Therefore, it is possible to solve the conventional large restriction on the form of the desk body and the lower and upper shelves, and increase the degree of freedom in designing the desk body, the lower and upper shelves. However, even when doing so, when the upper shelf that has been removed due to the change from the first usage pattern to the second usage pattern or the third state is reused, it is used as a storage shelf in the knee rest space of the desk body. It is possible to select a form to be placed and used on the top surface of the desk body or the like.

The present invention further improves the above-described desk with a shelf so that the degree of freedom in designing the desk body and the lower and upper shelves can be increased, but the first usage mode is also possible. It is to make it possible to expand the options of the reuse form of the upper shelf that has been removed due to the change from the second use form to the third use form.

[0010]

According to a first aspect of the present invention, there is provided a desk main body, a removable lower shelf arranged on a rear side of a top surface of the desk main body, and a lower shelf. A desk with a shelf provided on an upper part of a side shelf, the upper shelf being detachable, wherein the upper shelf is provided in a pair of left and right shelf side plates and in a substantially one-row state between the both shelf side plates. It is composed of multiple book stands that can be detachably fixed and can be used independently, and both shelf side plates can also be used as a connecting plate for fixedly connecting a plurality of book stands with vertical intervals. It is a point that is configured. According to the above characteristic configuration, by changing the combination of the desk main body and the lower shelf and the upper shelf in accordance with the change of the learning work style with the growth of the user, or the change of the preference and the usability of the desk shape. A first usage pattern in which a lower shelf and an upper shelf are arranged on the top surface of the desk main body, a second usage pattern in which only the lower shelf is arranged on the top surface of the desk main body, and a top plate of the desk main body It is possible to change from the upper surface to the third usage pattern in which both the lower shelf and the upper shelf are removed, and it is possible to diversify the usage pattern. Moreover, when the upper shelf that has been removed due to the change from the first usage pattern to the second usage pattern or the third usage state is reused, the upper shelf itself can be used independently with the pair of left and right shelf side plates. Since it is composed of multiple bookstands, it can be placed on a desk while left and right connected with a plurality of bookstands separated from the left and right shelf side plates, or
The bookshelves separated one by one can be placed and used at any position on the desk in any orientation. Further, by using both of the shelf side plates as a connecting plate, a plurality of book stands can be fixedly connected in a state that they are vertically spaced apart from each other, so that one independent book shelf can be configured. It can also be used by placing it on the floor side of the desk body. Moreover, since the upper shelf is configured by fixedly connecting a plurality of independently usable book stands between the left and right shelf side plates in a substantially one-row state, the left and right dimensions of each book stand can be set arbitrarily, The lateral distance between the left and right side plates of the shelves can be the same as the lateral distance between the left and right side plates of the desk body. Therefore, it is possible to increase the degree of freedom in designing the desk body and the lower and upper shelves by eliminating the large limitation in the form of the desk body and the lower and upper shelves as in the past. Also, it is possible to expand the options of the reuse form of the upper shelf that has been removed due to the change from the first use form to the second use form or the third use form.

According to a second aspect of the present invention, a desk with a shelf is characterized in that an outer plate is connected to each of the left and right ends of each of the bookshelves, and the outer plate is a shelf side plate or a left and right direction. The point is that it is also used as a connecting plate for fixedly connecting with an outer plate of another adjacent book stand. According to the above characteristic configuration, when a plurality of independently usable book stands are detachably fixedly connected between the left and right shelf side plates in a substantially one-row state, the left and right outer side plates provided on each of the book stands are attached to the shelf side plates or Since it can be used as a connecting plate for fixedly connecting to the outer plate of another book stand that is adjacent in the left-right direction, not only can the connection structure be simplified, but the shape retention strength of each book stand itself increases. Therefore, the strength of the upper shelf can be improved.

According to a third aspect of the present invention, there is provided a shelf-equipped desk, wherein the upper shelf is provided with a back plate for removably and fixedly connecting a pair of left and right shelf side plates, and the back plate and the book stand. In the opposite portions, a connecting portion for detachably fixedly connecting the book stand is formed.
According to the above-mentioned characteristic configuration, the upper and lower sides are combined by the fact that the pair of left and right shelf side plates are detachably fixedly connected via the back plate and that the back plate and the book stand are detachably fixedly connected. Not only can the strength of the shelves be improved, but also the assembling work can be facilitated when the plurality of bookshelves are detachably fixedly connected between the left and right shelf side plates in a substantially single row state.

According to a fourth aspect of the present invention, there is provided a characteristic feature of a desk with shelves, wherein among the bookshelves fixedly connected to each other through the shelf side plates at intervals in the vertical direction, the back of the bookshelf located at the lowermost position is It is located on the front side of the back of the book stand on the upper side. According to the above characteristic configuration, by using the both shelf side plates as connecting plates, a plurality of bookstands are fixedly connected in a state in which the bookshelves are vertically spaced from each other, so that one independent bookshelf is economically constructed. However, at this time, since the back of the book stand located at the bottom is located more forward than the back of the book stand at the upper side, a business trip such as a step is made at the lower end of the outer surface of the desk body. Even when there is a portion, the assembled bookshelf can be placed in close contact with the side of the desk body.

According to a fifth aspect of the present invention, there is provided a desk with shelves, characterized in that the left and right maximum lengths of the bookshelf separated from both shelf side plates of the upper shelf and connected in the left and right directions are:
The point is that the desk body is dimensioned so that it can be placed inside the knee insertion space on the back side. According to the above characteristic configuration, the first
Among the upper shelves that have been removed in accordance with the change from the use form to the second use form or the third use state, the book stand in the connected state separated from both shelf side plates is used as it is in the knee rest space of the desk body. Because it can be placed in the back side and arranged,
The options for reusing the removed upper shelf can be further expanded.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIGS. 1 to 12
Shows a desk with a shelf of the present invention used as a learning desk with a bookshelf, which is detachably attached to a desk main body A having a knee rest space S and a rear side of a top plate 1 of the desk main body A. It is composed of a lower shelf B to be attached and an upper shelf C which is detachably attached to the left and right shelf side plates 10 of the lower shelf B in a state of being located above the lower shelf B.
By changing the combination of the desk main body A and the lower shelf B and the upper shelf C according to the change of the learning work style with the growth of the user, or the change of the preference and the usability of the desk shape,
A first usage pattern in which a lower shelf B and an upper shelf B are arranged on the top plate 1 of the desk body A, and a second usage pattern in which only the lower shelf B is arranged on the top plate 1 of the desk body A. The lower shelf B and the upper shelf C are both removed from the upper surface of the top plate 1 of the desk main body A, and the third usage pattern can be freely changed.

As shown in FIG. 1, the desk body A has a pair of left and right side plates 2, a back plate 3 attached to the rear end portions of the both side plates 2, and a top plate mounted on the back plates 3. The bottom plate of the pair of left and right drawers 4 mounted on the lower surface of the top plate 1, both side plates 2 and the back plate 3 can be used to insert the knees of the seated person from the front. A knee rest space S is formed, and a shelf plate 5 located on the back side of the knee rest space S is attached across the both side plates 2 and the back plate 3.

As shown in FIGS. 1 and 2, the lower shelf B has a pair of left and right shelf side plates 10, a rear plate 11 fixedly connected to the rear end portions of both shelf side plates 10, and The back plate 1
A shelf receiving member 14 that detachably mounts and supports a movable shelf plate 13 across a central partition plate 12 that is fixed to the left and right central portions of the front surface of 1, and a fixed shelf plate 16 that includes two partition plates 15.
And the lower surface of the fixed shelf board 16,
A pair of left and right drawers 17 is provided. The lower shelf B is detachably fixedly connected to the top plate 1 of the desk body A via a pair of left and right attachment fittings 18 known in the art.

As shown in FIGS. 1 to 3, the upper shelf C includes a pair of left and right shelf side plates 20, and a back plate 21 which is detachably fixedly connected to the rear end portions of the shelf side plates 20. as well as,
The shelf side plates 20 are composed of a plurality of independently usable (two in the embodiment) book stands 22 that are detachably fixedly connected in a substantially single-row state between the shelf side plates 20. It is configured so that it can also be used as a connecting plate for fixedly connecting a plurality of book stands 22 in a state in which they are vertically spaced from each other.

Each of the main stands 22 has a pair of left and right outer plates 22A, a back plate 22B fixedly connected to the upper half portions of the rear ends of both outer plates 22A, and front end sides of both outer plates 22A. A front plate 22C as a front leg that is fixedly connected across the lower side, a mounting plate 22D that is fixedly connected in a horizontal posture across these three members 22A, 22B, 22C, and the left and right sides of the mounting plate 22D. It is composed of a partition plate 22E fixed to the central position and the right and left central positions of the back plate 22B, and is configured such that it can be placed and used independently on the top plate 1 of the desk body A, the floor surface, or the like. There is.

Each outer plate 22A constituting the book stand 22
2 at the upper and lower sides and at the front and rear two locations in total, a mounting hole 22a for fixedly connecting to the outer side plate 22A of the shelf side plate 20 or another book stand 22 adjacent in the left-right direction via bolts 26 and nuts 27. And a nut 27 that can be screwed into the bolt 26 inserted into the mounting hole 22a of the outer plate 22A is provided at a total of four positions of the upper and lower two positions and the front and rear two positions of each shelf side plate 20. It is embedded and fixed (fixed by driving), and each of the outer plates 22A is
It is also configured as a connecting plate for fixedly connecting to the shelf side plate 20 or an outer plate 22A of another book stand 22 adjacent in the left-right direction.

A connecting portion 24 for removably and fixedly connecting the book stand 22 is provided at a position where the back plate 21 and each book stand 22 face each other in the front-rear direction. This connecting part 2
Reference numeral 4 denotes a mounting hole 21a penetratingly formed at two positions in the longitudinal direction of the rear plate 21, a nut 27 fixedly embedded (fixed) in the rear end surface of the mounting plate 22D of the book stand 22, and the mounting hole 21a. The bolt 26 is screwed into the nut 27.

A connecting tool (connecting means) 30 for removably and fixedly connecting the shelf side plate 20 and the back plate 21 is shown in FIGS.
As shown in FIG. 0, connecting pins 31 having annular locking grooves 31a are provided at upper and lower two positions on both left and right end surfaces of the back plate 21, and the connecting pins 31 are provided on the shelf side plate 20.
Embeds a lock case 32 having a connecting hole 32a that can be inserted and removed from the left and right directions.
When the connecting pin 31 is inserted into the connecting hole 32a, the connecting pin 31 is rotated by a rotating operation of a driver or the like.
The lock member 33 is assembled so that it can be switched between a locked state in which the locking groove 31a is engaged from the outside in the radial direction and a unlocked state in which the locking groove 31a is disengaged from the locking groove 31a in the radial direction.

A connecting tool (connecting means) 35 for detachably and fixedly connecting the shelf side plate 10 of the lower shelf B and the shelf side plate 20 of the upper shelf C is shown in FIGS. 11, 12A and 12B. As shown, the connecting pins 36 having the annular locking grooves 36a are provided at the front and rear two positions on the upper end of the shelf side plate 10 which constitutes the lower shelf B, and at the bottom of the shelf side plate 20 which constitutes the upper shelf C. Is
The connecting pin 36 forms a connecting hole 37 that can be inserted and removed from the vertical direction, and the connecting hole 3 is formed on the inner side of the connecting hole 37.
When the connecting pin 36 is inserted into the connector 7, a rotation operation by a driver or the like switches the lock state to allow the connecting pin 36 to be inserted and removed and the locked state to engage the engaging groove 36a of the connecting pin 36. The lock member 38 is assembled.

When assembling the upper shelf C, as shown in FIGS. 1 to 3, the shelf side plate 20 and one outer plate 22A of the book stand 22 opposite to the shelf side plate 20 are fixedly connected by a bolt 26. At this time, the bolts 26 are inserted into the mounting holes 22a on the upper side of the outer side plate 22A, and the inserted bolts 26 are screwed into the embedded nuts 27 on the upper side of the shelf side plate 20. Further, the other outer plates 22A of the two bookshelves 22 adjacent to each other in the left-right direction are also fixedly connected by the bolts 26 and the nuts 27. At this time, the bolts 2 inserted into the four mounting holes 22a, respectively.
6 and the bag-shaped nut 27 are firmly fixed and connected.

Further, as shown in FIGS. 4 and 5, the upper shelf C removed along with the change from the first usage pattern to the second usage pattern or the third usage pattern is used as an independent bookshelf. In the case of reuse, the fixed fixing connection between the shelf side plate 20, the back plate 21 and the book stand 22 is released, and then the mounting hole 2 on the lower side of the outer plate 22A constituting one book stand 22 is released.
2a is used, the bolt 26 inserted therein is screwed and fixed to the embedded nut 27 on the upper side of both shelf side plates 20, and the upper side mounting hole 22a of the outer side plate 22A constituting the other main stand 22. , The bolts 26 inserted through the bolts are inserted into the embedded nuts 27 on the lower side of both shelf side plates 20.
It is fixed by screwing. At this time, since both of the embedded nuts 27 on the lower side of the shelf side plate 20 are arranged in a state of being displaced more forward than the embedded nuts 27 on the upper side, the state where they are assembled in one independent bookshelf. Then, of the bookshelves 22 which are fixedly connected to each other through the shelf side plates 20 at intervals in the vertical direction, the back surface of the bookshelf 22 located at the lowermost position is arranged in front of the back surface of the bookshelf 22 on the upper side. It is configured to be.

[Second Embodiment] FIG. 13 shows the upper shelf C.
The maximum left-right length W of the book stand 22 separated from both shelf side plates 20 and connected in the left-right direction via the bolts 26 and the nuts 27 is at the back side of the knee rest space S of the desk body A. It is configured to be able to be inserted and arranged, that is, the left and right maximum length W of the book stand 22 is configured to be slightly smaller than the facing surface distance W3 in the left and right direction of the side plates 2 of the desk body A. And both side plates 2 of the desk body A
Is attached to the attachment hole 2 of the outer plate 22A that constitutes the book stand 22.
By using 2a, a nut 27 that is screwed into a bolt 26 that is inserted therein is fixed by embedding (fixing by driving).
Since the other configurations are the same as the configurations described in the first embodiment, the same components will be denoted by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

[Other Embodiments] (1) In each of the above-described embodiments, a pair of left and right shelf side plates 20 is provided.
Two bookshelves 22 were detachably fixed in a row in the left-right direction across the space, but three or more bookshelves 22 were detachably fixed in a row in the left-right direction. You may implement by connecting. (2) A connector (connecting means) 30 for fixing the shelf side plate 20 and the back plate 21 in a detachable manner, and the shelf side plate 10 of the lower shelf B and the shelf side plate 20 of the upper shelf C are detachable. The connector (connecting means) 35 that is fixedly connected to is not limited to the structure of the above-described embodiment,
Any structure may be adopted as long as the both can be detachably fixedly connected. (3) Attachment means for detachably attaching the lower shelf B to the desk body A, and the upper shelf C to the lower shelf B
There are various methods for attaching the device so that it can be detachably attached, and the attaching method can be arbitrarily changed as long as the object of the present invention can be achieved.

[Brief description of drawings]

FIG. 1 is an overall front view showing a first embodiment of a desk with a shelf of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an exploded perspective view of an upper shelf.

FIG. 4 is a perspective view when the upper shelf is disassembled and assembled to the bookshelf.

FIG. 5 is a vertical sectional view when the upper shelf is disassembled and assembled to the bookshelf.

FIG. 6 (a) is an enlarged cross-sectional view immediately before connecting the outer plates of both stands to each other. (B) is an enlarged cross-sectional view of the outer plates of both stands connected to each other.

FIG. 7A is an enlarged cross-sectional view immediately before connecting the outer plate and the shelf side plate of the book stand, and FIG. 7B is an enlarged cross-sectional view when the outer plate and the shelf side plate of the book stand are connected.

FIG. 8 is an enlarged cross-sectional view immediately before connecting the shelf side plate and the back plate of the upper shelf.

FIG. 9 is an enlarged cross-sectional view when the shelf side plate and the back plate of the upper shelf are connected.

FIG. 10 is a side view of a connector for connecting the shelf side plate and the back plate of the upper shelf.

FIG. 11 is an enlarged side view immediately before connecting the shelf side plate of the upper shelf and the shelf side plate of the lower shelf.

FIG. 12 (a) is an enlarged cross-sectional side view when the shelf side plate of the upper shelf and the shelf side plate of the lower shelf are connected, and (b) shows the shelf side plate of the upper shelf and the shelf side plate of the lower shelf are connected. Enlarged sectional front view when

FIG. 13 is an overall front view showing a second embodiment of the desk with shelves of the present invention.

FIG. 14 is an overall front view of a desk with a shelf devised during the development of the present invention.

15 is an enlarged sectional view taken along line XV-XV of FIG.

16 is an enlarged sectional view taken along line XVI-XVI of FIG.

[Explanation of symbols]

A desk body B lower shelf C upper shelf S knee space 1 Top plate 20 shelf side plate 21 Back plate 22 bookshelf 22A outer plate 22B back plate 24 Connection

Continuation of front page (56) Reference JP-A-8-66244 (JP, A) JP-A-11-32846 (JP, A) JP-A-10-262743 (JP, A) JP-A-10-248651 (JP , A) Actually open 6-24533 (JP, U) Actually open 5-15848 (JP, U) Actually open 56-38633 (JP, U) Actually open 49-27613 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) A47B 17/00 A47B 65/00 601

Claims (4)

(57) [Claims] 1. A desk body, a detachable lower shelf arranged on a rear side of a top surface of the desk body, and a detachable upper shelf arranged on an upper portion of the lower shelf. A desk with shelves, comprising: a pair of left and right shelf side plates, and a plurality of independently usable book stands that are detachably fixedly connected between the shelf side plates in a substantially one-row state. is configured, the two shelf side plate is used also configured to be able to connecting plate for fixedly connected in the state spaced multiple Hontate vertically, further, the upper
On the shelf, a pair of left and right shelf side plates are fixedly and detachably connected.
A face plate is provided, and the back plate and the book stand
The stand is detachably fixedly connected to the opposite parts.
A desk with a shelf that has a connecting part for it . 2. A desk body and a rear side of a top surface of the desk body.
On the lower shelf that can be freely attached and detached, and on this lower shelf
A desk with a shelf equipped with a detachable upper shelf that is installed in the
And the upper shelf extends between the pair of left and right shelf side plates and both shelf side plates.
For single use, it is detachably fixedly connected in almost one row
It consists of multiple possible book stands and
Both shelf side plates are in the form of multiple bookshelves spaced vertically.
It can be used as a connecting plate for fixed connection in the state,
Furthermore, disassemble the upper shelf and assemble it into one independent bookshelf.
In the folded state, both shelves are used to separate the gap in the vertical direction.
Of the bookshelves that are fixedly connected with each other at the bottom
All rear faces are located in front of the rear of the upper book stand
Desk with a shelf. 3. An outer plate is connected to each of the left and right end portions of each book stand, and each outer plate is fixedly connected to a shelf side plate or an outer plate of another book stand adjacent in the left-right direction. Or a connecting plate for use as a structure.
Desk with a shelf described in 2 . 4. The dimension in which the left and right maximum lengths of the bookshelf separated from both the shelf side plates of the upper shelf and connected in the left-right direction can be arranged so as to enter the back side of the knee rest space of the desk body. The desk with shelves according to claim 1 or 2, wherein the desk has a shelf.