JPH0644891B2 - Desk footboard equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a footboard device preferably used for a learning desk or the like.

[Prior Art] With respect to a learning desk or the like, various measures have been taken to allow a rapidly growing school child to use for a long period of time.

As one of them, a combination of a desk with a height adjustable footboard between inner walls under a top plate and a chair with adjustable seat height has been developed. And this one
When the user is a short child, the footboard of the desk and the seat of the chair are set in a high position, and the position and the seat height of the footboard are adjusted appropriately as they grow. There is. That is, according to such a combination, it becomes possible for a child to an adult to use a desk with a fixed top height without difficulty.

The footboard is arranged on the front side of the desk due to its character. Therefore, if you make this footboard just like a shelf board, this footboard gets in the way,
It becomes impossible to store the chair under the tabletop when the desk is not used.

Therefore, recently, a pair of rail members are attached to the facing inner wall surfaces of the desk main body so that the vertical position can be changed, and a footboard is laid between the horizontal rail surfaces of these rail members. It is proposed that the front end portion of the link member is pivotally attached to the intermediate position of the lower surface of the link member, and the rear end portion of the link member is pivotally supported by a recessed groove continuous to the rear end of the rail surface. In this structure, the link member is biased by a torsion coil spring so as to converge near the position orthogonal to the footboard, and the link member is rotated backward against the biasing force. The footboard is supported by the rail member in a moved state. When the footboard is not loaded, the urging force of the spring holds the rear end of the footboard so that it is slightly floating from the rail surface.

However, with such a structure, when the chair is inserted under the top plate of the desk when the foot is not placed on the footboard when not in use, the front end of the footboard is moved backward by the legs of the chair. Will be pressed. When the front end of the footboard is pushed rearward, the footboard is held in a state where the rear end side is floating and the intermediate position is connected to the rear end of the rail member via the link member. The rear end side rises and stands up while the front end side slides on the rail surface. Therefore, the chair can be stored under the top plate of the desk without being disturbed by the footboard. Moreover, since the footboard does not slide rearward but stands up and retracts, it is possible to use a space deeper than the footboard as a storage space.

[Problems to be Solved by the Invention] However, in such a configuration, the left and right rail members are independent of each other. Then, by threading screw members such as screws on the front end side and the rear end side of each of the rail members, and by screwing those screw members to one of the insert nuts embedded in a plurality of stages on the inner wall surface,
Each of these rail members can be attached to a desired height position. Moreover, the rail member includes a plate-shaped base body that is in contact with the inner wall surface, and a rib that horizontally protrudes from the middle step of the base body and has an upper surface thereof as a rail surface. Also, the screw members are attached to the lower portion.

Therefore, all of the four screw members are hidden under the ribs, which requires time and effort for the attachment / detachment operation.
Therefore, adjusting the height of the footboard imposes an unreasonable posture for a long time.

In addition, when adjusting the height of such a rail member, it is necessary to first remove the footboard from the rail member, and after the height adjustment of the rail member is completed, place the footboard on it. You need to set it,
Conventionally, the rear ends of the left and right link members are free ends and exist only near the rail members. Therefore, it is difficult to touch the link member from the upper surface side of the footboard. Therefore, when attaching or detaching the rear end of each link member to the recessed groove or the like provided in the rear end of the rail member,
It is necessary to rotate the hand to the lower side of the footboard to rotate and hold the link member at a required position, which causes a problem that a very unreasonable posture is forced.

It is rarely necessary to attach and detach the footboard not only when adjusting the height of the rail members, but also when storing large books in the back of the footboard. Absent. Especially when the footboard is set at a high position, the frequency becomes high. Therefore, some measures are strongly desired for such difficulty of attachment and detachment.

The present invention aims to solve such problems.

[Means for Solving the Problems] The present invention adopts the following configuration in order to achieve such an object.

That is, the desk footboard device according to the present invention includes a pair of rail members attached to the opposing inner wall surfaces of the desk body,
A footboard having both ends of the lower surface supported on the rail surfaces of these rail members and erected between the inner wall surfaces, and a front end portion pivotally attached to an intermediate position on the lower surface side of the footboard and a rear end portion of the rail member. A pair of left and right link members pivotally supported at the rear ends of the members, and a connecting rod for connecting the rear ends of the link members so that they are located near the rear ends of the footboards in a state where the footboards are installed. A front end side of the rail member, which is higher than the rail surface, is detachably fixed to the inner wall surface via a front stopper, and the rear end side of the rail member is It is characterized in that it is detachably and rotatably fastened to the inner wall surface via a rear fastening device.

Then, in this case, in order to maintain both the stability of the rail member and the ease of removing the rail member at a high level, a screw member capable of being screwed to the nut provided on the inner wall surface of the front stopper, or Insertion pin that can be fitted into the holding hole provided on the inner wall surface,
It is desirable that the rear stopper is a dowel that can be fitted into a holding hole provided on the inner wall surface.

Further, in the case where importance is attached to the ease of attachment / detachment, it is preferable that the front end side and the rear end side of the rail member are detachably fixed to the inner wall surface of the desk body via the dowels. In this case, the protruding position of the dowel may be above or below the rail surface.

When both the front end side and the rear end side of the rail member are fixed to the inner wall surface by dowels, at least one end portion of the rail member is integrally provided with an upwardly movable elastic arm portion, It is preferable to provide the dowel on the upper end portion of the arm portion.

As another means for facilitating the attachment / detachment of the rail member, a notch groove that opens downward on the front end side and the rear end side of the rail member is provided, and the rail member is detachably fitted into a holding hole on the inner wall surface. An example is one in which the rail member is fixed to the inner wall surface by engaging the notch groove with the insert pin.

When the rail member is fixed by a combination of the cutout groove and the insertion pin, the rail member is a base body having a cutout groove, and a rib protruding inward from the base body and having an upper surface thereof as a rail surface, The rib has a hanging piece that hangs from the lower surface of the rib substantially parallel to the base body, and the head of the insertion pin engaged with the cutout groove is held by the base body and the hanging piece. It can also be configured to be able to do so.

[Operation] The front end side of the rail member, which is higher than the rail surface, is detachably fixed to the inner wall surface via the front stopper, and the rear end side of the rail member is If a portion lower than the rail surface is detachably and rotatably fixed to the inner wall surface via the rear stopper, the front stopper which is present above the rail surface, which is easy to operate from the front side, is firstly attached. If the front end side of the rail member is appropriately rotated after removal, the rear stopper can be removed without being forced to take an unreasonable posture. Then, when the rail member is fixed to the desired height position of the inner wall surface, conversely, the rear stopper is first attached while the rail member is held in the desired rotation posture, and then the rail member is fixed. It suffices to attach a front stopper which is easily rotated and rotated to a normal posture. Moreover, since the front end of the rail member is fixed in a suspended state, the rail member can be stably supported against a load from above.

And, in this case, the front stopper is a screw member, or
If the insertion pin is used and the rear stopper is a dowel, the loading / unloading operation of the rail member can be performed particularly smoothly. That is, by doing this, the front end side screw member or the insertion pin is removed, the rail member is reciprocally rotated up and down to disengage the rear end side dowel from the holding hole, and a new holding Can be installed in the hole.

Further, if the front end side and the rear end side of the rail member are detachably fixed to the inner wall surface of the desk body via the dowels, respectively, it is not necessary to rotate the screw member. In this type of footboard device, since the footboard is interposed between the rail members during use, the rail member does not separate from the inner wall surface unless the footboard is removed from between the rail members. If at least one end of the rail member is integrally provided with an upwardly-movable arm that can be elastically displaced, and the dowel is provided at the upper end of this arm, the dowel on the front end side and the dowel on the rear end side can be provided. It is possible to change the separation distance from and in a relatively wide range by the elastic deviation of the arm portion.

On the other hand, a notch groove that opens downward is provided at the front end side and the rear end side of the rail member, and the notch groove is engaged with a plug pin that is removably fitted in a holding hole on the inner wall surface, and the rail member is provided. In the one that is fixed to the inner wall surface, the rail member is slid upward to release the engagement between the notch groove and the insertion pin,
The height of the footboard can be changed by changing the insertion position of the insertion pin and then pressing the rail member downward to re-engage the cutout groove with the insertion pin.

In this case, the lower surface of the rib forming the rail surface or the hanging piece is hung substantially parallel to the base body, and the head of the insertion pin engaged with the notch groove is held by the base body and the hanging piece. With such a structure, when a load is applied to the footboard and a downward force is applied to the rail surface during use, the hanging piece strongly presses the head of the insertion pin. As a result, the insertion pin is prevented from coming off, and the reaction force suppresses the downward deformation of the rib.

Although the height of the rail member can be adjusted as described above, the operation of attaching and detaching the footboard to and from the rail member before and after the height adjustment is essential. At this time, in the present invention, since the rear end portions of the left and right link members supported on the rear end side of the rail member are connected by the connecting rod, the connection is made when the rear edge of the footboard is touched. It is also possible to grab the rod and thereby fix the link member. Therefore, the operation of attaching / detaching the rear end portions of both link members to / from the rail member becomes easy.

[Embodiment] First, an embodiment shown in FIGS. 1 to 5 will be described.

FIG. 1 shows a desk body 1 and a footboard device 2 mounted on the desk body 1. The footboard device 2 has a bilaterally symmetric form, and the intermediate portion thereof is omitted in FIG. The footboard device 2 includes a pair of rail members 3 attached to the inner wall surfaces 11 and 12 of the desk body 1 facing each other, a footboard 4 installed between the rail members 3, and a front end portion 51 of the footboard device 2. The board 4 is provided with a link member 5 which is pivotally attached to an intermediate position on the lower surface side and whose rear end portion 52 is pivotally supported by the rear end portion 3a of the rail member 3.

The desk body 1 includes a top plate 15 between the upper ends of the left and right side plates 13 and 14.
However, the height of the top plate 15 cannot be adjusted. Then, the seat height is adjusted in a space 17 formed between one inner wall surface 11 formed by the left side plate 13 and the other inner wall surface 12 formed by the sleeve 16 provided inside the right side plate 14. The seat and leg 61 of the possible chair 6 can be accommodated. The footboard device 2 according to the present invention is provided on the front side of the space 17, and a storage shelf 18 for placing documents and the like is provided on the back side.

As shown in FIGS. 2 and 4, the rail member 3 is made of a synthetic resin elongated in the front-rear direction, and is a screw member 3 as a front stopper.
0 and the inner wall surface 11 via the dowel 31 which is a rear stopper,
The base 32 is attached to the base 12, and the rib 33 is provided so as to project inwardly from the base 32. The upper surface of the rib 33 serves as a rail surface 34. A recessed groove 35 continuous with the rail surface 34 is provided at the rear end 3a of the rail member 3. The recessed groove 35 has an inverted keyhole shape including a narrow inlet portion 35a and a bottom portion 35b having a circular shape in a side view. The screw member 30 for fixing a portion of the rail member 3 on the front end side of the base body 32 and above the rail surface 34 is screwed to the insert nut 36 embedded in the inner wall surfaces 11 and 12. . On the other hand, the base 32
The dowel 31 for fixing the rear end side of the
It can be fitted into the holding hole 37 formed in the.
The insert nut 36 and the holding hole 37 are provided in a plurality of sets at intervals in the vertical direction. By selecting the insert nut 36 and the holding hole 37 to be used, the mounting position of the rail member 3 can be changed stepwise in the vertical direction. The rail surfaces 34 of both rail members 3 are set to be held horizontally regardless of which position the rail members 3 are attached.

The footboard 4 has a rectangular shape, and has a depth dimension that is a little less than half the depth dimension of the space 17, and a lower surface 41 thereof.
Both end portions 41a of the above are supported by both rail surfaces 34 and are installed between both inner wall surfaces 11 and 12.

The link member 5 is made of, for example, a metal wire material, and the front end portion 51 bent inward is formed on the lower surface 4 of the footboard 4.
1 is pivotally attached to the bearing 42 attached to the portions near both ends of the rail 1 and the rear end portion 52 protruding outward is engaged and pivotally supported by the recessed groove 35 of the rail member 3. And
The rear ends 52 of the left and right link members 5 are connected to each other via a connecting rod 7. More specifically, the left and right link members 5 and the connecting rod 7 are integrally formed by one wire, and the rear end portion 52 of each of the link members 5 is formed into a flat shape in which the wire has a U-shape. , The rear end 52 and the bottom 35b
Only in the above, the rear end portion 52 is engaged with the above-mentioned inverted keyhole-shaped recessed portion 35 that allows the rotation. A grip portion 71 is provided at an intermediate portion of the connecting rod 7. Gripper 71
Is formed by deforming the member into a U-shape, and the rear end 44 of the footboard 4 can be brought close to each other when the footboard 4 is mounted between the rail members 3. FIG. 3 shows a state in which the footboard 4 is removed from the rail member 3. Then, the link member 5 is converged to a neutral position shown by a solid line in FIG. 3, that is, a position substantially orthogonal to the footboard 4 by the torsion coil spring 53 provided in the bearing 42 portion. , Elastically biased. The urging force of the torsion coil spring 53 is such that the rear end 44 side of the footboard 4 slightly floats up from the rail surface 34 when the footboard 4 is placed on the rail surface 34. Has been selected.

With such a structure, the footboard 4 forms the rail surface 34 at a constant angle θ with respect to the link member 5.
Held on. Therefore, when the chair 6 is stored in the space 17 under the top plate of the desk body 1, if the front end 43 of the footboard 4 is pushed rearward by the leg portion 61 of the chair 6, the rearward pressing force F is generated. , The front end portion 51 of the link member 5
Will work as a force to lift up. As a result, the front end 43 of the footboard 4 moves rearward along the rail surface 34 as shown in FIG. 5, and the intermediate portion thereof is lifted by the projecting tension of the link member 5 and stands up. . Then, when the pressing force F by the chair 6 is released, the footboard 4 returns to the original position shown in FIG. 4 by the spring force and the gravity that urge the link member 5 to the neutral position. It will be.

Moreover, with such a structure, the rail member 3
It is possible to easily assemble and change the height position. For example, in the case of adjusting the height position, first, the screw member 30, which is the front stopper, is removed. This screw member 30 is
Since it exists above the rail surface 34, it is easy to operate from the front side. Thereafter, the front end side of the rail member 3 is turned up and down several times to loosen the dowel 31 which is the rear stopper and is pulled out from the holding hole 37.
It can be disengaged from 1, 12. When the rail member 3 is reattached to the desired height position of the inner wall surfaces 11 and 12, conversely, the front end side of the rail member 3 is lifted and visually observed while the dowel 31 is held in a desired holding hole. 37, and while appropriately rotating the rail member 3, the dowel 3
1 is press-fitted into the holding hole 37. After that, the rail member 3
It suffices that the screw member 30 that is easy to operate is attached by rotating the to a normal posture.

In this case, however, the front end portion 3b of the rail member 3 is fixed in a suspended state, so that the rail member 3 can be stably supported against a load from above.

Further, according to the above configuration, the connecting rod 7 that connects the rear end portions 52 of the link members 5 to each other on the rear edge 44 of the footboard 4 in the state where the footboard 4 is set on the rail member 3. Will be close. Therefore, when the rear end 44 portion of the footboard 4 is gripped from the upper surface 45 side by hand, the connecting rod 7 can be gripped together. If the foot board 4 and the connecting rod 7 are gripped together in this way, the link member 5 is held at the position pivoted rearward, so that the rear end portion 52 of the link member 5 is inserted into the concave groove 35. The work of mounting and detaching from the recessed groove 35 can be performed without turning the hand to the lower surface 41 side of the footboard 4.

In the above embodiments, the case where the front stopper is the screw member 30 has been described. However, instead of the screw member, an insertion pin that can be detachably fitted in the holding hole of the inner wall surface is used. Good.

In the embodiment shown in FIG. 6, the front end side of the rail member 103 is
Inner wall surfaces 111, 11 of the desk body 101 are inserted through dowels 130, which are front stoppers protruding from a portion higher than the rail surface 134.
2 and the rear end side of the rail member 103,
The dowel 131, which is provided as a fastening device, is provided at a position lower than the rail surface 134 so as to be fastened. In FIG. 6, reference numeral 108 is a locking projection for preventing the front end side of the footboard (not shown) placed on the rail surface 134 from being lifted upward by an external force.

In the embodiment shown in FIG. 7, the front end side of the rail member 203 is
Inner wall surfaces 211, 21 of the desk body 201 are inserted through dowels 230, which are front stoppers protruding from a portion higher than the rail surface 234.
2 and the rear end side of the rail member 203,
The dowel 231 as a fastening device is provided so as to project from a portion higher than the rail surface 234, and is then fastened.

In the embodiment shown in FIG. 8, the front end side of the rail member 303 is
Inner wall surfaces 311 and 31 of the desk body 301 are inserted through dowels 330, which are front stoppers protruding from a portion lower than the rail surface 334.
2 and the rear end side of the rail member 303,
The dowel 331, which is a post-fastening tool, is provided so as to project from a portion higher than the rail surface 334, and is then fastened.

In the embodiment shown in FIG. 9, an upward arm portion 438 that can be elastically displaced is integrally provided at an end portion of the rail member 403, and the arm portion 438 is provided with a dowel 431 that is a rear locking tool. That is, the notch portion 439 that opens upward is provided in the vicinity of the rear end of the rail member 403, and the portion behind the notch portion 439 is the arm portion 438. Then, the dowel 431 is projectingly provided on the upper end portion of the arm portion 438. The dowel 430, which is a front stopper, may be provided at a position higher than the rail surface 434 as shown in the drawing, or
It may be provided at a position lower than the rail surface 434. With such a configuration, the distance between the front end side dowel 430 and the rear end side dowel 431 can be changed in a relatively wide range by the elastic displacement of the arm portion 438. Therefore, even if there is some deviation in the distance between the holding hole for fitting the front end side dowel 430 and the holding hole for fitting the rear end side dowel 431, the both dowels 430, 431 may be different. Can be easily attached to the corresponding holding hole. Therefore, high processing accuracy is not required.

In the embodiment shown in FIG. 10, the base 53 of the rail member 503 is used.
2, a notch groove 532a that opens downward to the front end side and the rear end side,
532b are provided respectively, and the notch grooves 532a and 532b are engaged with the insertion pins 530 that are detachably fitted into the holding holes 537 of the inner wall surfaces 511 and 512, and the rail member 503 is stopped on the inner wall surfaces 511 and 512. I'm wearing it. The insertion pin 530 has a tip small diameter portion 530a and a large diameter portion 530b.
And a head portion 530c, the small diameter portion 530
The a is detachably fitted into a holding hole 537 formed in the inner wall surfaces 511 and 512 of the desk body 501. Then, the large diameter portion 530b is made to engage with the cutout grooves 532a and 532b of the rail member 503.
With such a structure, however, the rail member 503 is simply lifted up to disengage the cutout grooves 532a and 532b from the insertion pin 530, and the rail member 503 is moved to the inner wall surface 511. It can be removed from 512. Then, after changing the insertion position of the insertion pin 530, the rail member is pushed down to
As shown, the height of the footboard 504 can be changed by re-engaging the cutout grooves 532a, 532b with the insertion pin 530.

In the embodiment shown in FIG. 12, the rail member 603 is provided with a cutout groove 63.
A base body 632 having 2a and 632b, and this base body 632.
A rib 633 projecting inwardly from the base plate 632 and having an upper surface thereof as a rail surface 634;
And a head 630c of the insertion pin 630 engaged with the cutout grooves 632a and 632b by the base 632 and the hanging piece 639. It is constructed so that it can be held. Thus, according to such a configuration, as shown in FIG. 13, when a load is applied to the footboard 604 during use and a downward force acts on the rail surface 634, the hanging piece 639 is inserted. The head 630c of the pin 630 is strongly pressed. As a result, the insertion pin 630 is prevented from coming off, and the reaction force thereof suppresses the downward deformation of the rib 633. Therefore, it is possible to reliably prevent the insertion pin 630 from falling off, improve the support rigidity of the foot board 604 by the rail member 601, and use the lightweight rail member 603 made of a small amount of material to allow a large load. Can be supported.

The rail surface of the rail member may be inclined so that the rear end side is higher than the front end side. With this configuration, the retracting operation described above can be performed without the rear end side of the footboard being lifted from the rail surface by the spring force.

[Advantages of the Invention] Since the present invention is configured as described above, it has the effects described below.

In the footboard device according to claim 1, a front stopper for fixing the front end side of the rail member is provided at a position higher than the rail surface, and the rail member is rearward with the front stopper removed. Since the fastener can be rotated about the axis, the operation is easier than the case where the fastener existing under the rib is detached to attach and detach the rail member. You can change the height of the footboard without having to force yourself. Moreover, according to such a configuration, since the front end portion of the rail member is fixed in a suspended state, the rail member can be stably supported against a load from above. That is,
Since it is highly likely that a load will be applied to the front end side of the footboard, if the front end side of the rail member supporting the footboard can be supported by the desk body in a suspended state, the support state will be particularly stable. It becomes a thing. Further, in the footboard device of the present invention, since the left and right link members can be fixedly held by gripping the connecting rod from the upper surface side of the footboard, the rear ends of these link members are railed. The operation of attaching / detaching to / from the rear end of the member can be easily performed.

In the footboard device according to claims 2 and 3, since a screw member or an insertion pin is used as the front stop attachment and a dowel is used as the rear stop attachment, as described above, it is particularly easy. The rail member can be attached and detached.

Further, in the footboard device according to claim 4, since the rail member is detachably fixed to the inner wall surface of the desk body using only the dowel, there is no need to rotate the screw member at all, and the rail member It can be easily attached and detached. In this type of footboard device, since the footboard is interposed between the rail members during use, the rail member does not separate from the inner wall surface unless the footboard is removed from between the rail members. Therefore, even if the rail member is fixed by the dowel, the rail member does not fall off during use. In addition, if the rail member is integrally provided with the dowel, not only the number of parts can be reduced and manufacturing can be facilitated, but also small parts that may be lost can be eliminated.

Furthermore, in the footboard device according to the fifth aspect, the distance between the front end side dowel and the rear end side dowel can be changed in a relatively wide range by the elastic deviation of the arm portion. High dimensional accuracy is not required for processing the holding hole for fitting the dowel, which facilitates manufacturing.

Further, in the footboard device according to the sixth aspect, since the notch groove is engaged with the insertion pin to fix the rail member to the inner wall surface, the vertical movement of the rail member and the insertion pin are performed. The height of the footboard can be changed only by the loading / unloading operation. Therefore, also in this case, it is not necessary to attach and detach the screw member existing in the hidden portion, and the height of the footboard can be easily and quickly adjusted.

Further, in the footboard device according to claim 7, when a load is applied to the rail surface and the rib is about to be deformed,
Since the hanging piece is pressed against the head of the insertion pin, it is effective to prevent the insertion pin from falling out during use, despite using the insertion pin that is easy to put on and take off. The effect that the footboard can be reliably supported by the lightweight rail member because the downward deformation of the rib can be suppressed by preventing the hanging piece from contacting the insertion pin. Is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of the entire desk, FIG. 2 is an exploded perspective view, FIG. 3 is a side sectional view of a footboard, FIG. 4 is a side sectional view showing a footboard and rail members, and FIG. 4 corresponding to FIG. 4, FIG. 6, FIG. 7, FIG. 8, FIG. 9, and FIG. 10 are side views showing the rail member respectively, and FIG. 11 is a transverse view showing the footboard of FIG. FIG. 12 is a side view of the rail member, and FIG. 13 is a transverse sectional view showing the rail member of FIG. 1, 101, 201, 301, 501, ... desk body 2 ... footboard device 3, 103, 203, 303, 403, 503, 603
...... Rail member 4,504,604 …… Footboard 5 …… Link member, 7 ・ ・ ・ Coupling rod 30 …… Front stop fastener (screw member) 31 …… Rear stop fastener (dowel) 34,134,234,334 , 434, 634 ... Rail surface 44 ... Rear end 130, 230, 330, 430 ... Front stopper (dowel) 131, 231, 331, 431 ... Rear stopper (dowel) 530, 630. Insertion pins 532a, 532b, 632a, 632b ... Notch groove 530c ... Head, 632 ... Base body 633 ... Rib, 639 ... Hanging piece

Claims (7)

[Claims] 1. A pair of rail members attached to opposing inner wall surfaces of a desk body, and a footboard installed between both inner wall surfaces of the rail members so that both ends of the lower surface are supported on the rail surfaces. , A pair of left and right link members whose front end is pivotally attached to an intermediate position on the lower surface side of the footboard and whose rear end is pivotally supported by the rear end of the rail member, and the footboard being installed. A connecting rod for connecting the rear ends of the link members so as to be located in the vicinity of the rear end of the link member. A desk that is detachably fastened to the inner wall surface via a back end of the rail member and is detachably and rotatably fastened to the inner wall surface via a rear fastening device. Footboard device. 2. The front stopper is a screw member that can be screwed into a nut provided on the inner wall surface, and the rear stopper is a dowel that can be fitted into a holding hole provided on the inner wall surface. The footboard device for a desk according to claim 1. 3. The front stop fitting is an insertion pin that can be fitted into a holding hole provided on the inner wall surface, and the rear stop fitting is a dowel that can be fitted into a holding hole provided on the inner wall surface. The footboard device for a desk according to claim 1, wherein the footboard device is a desk. 4. A pair of rail members attached to opposing inner wall surfaces of a desk body, and a footboard erected between both inner wall surfaces of the rail members with both ends of the lower surface supported on the rail surfaces. , A pair of left and right link members whose front end is pivotally attached to an intermediate position on the lower surface side of the footboard and whose rear end is pivotally supported by the rear end of the rail member, and the footboard being installed. A connecting rod for connecting the rear ends of the link members so as to be located in the vicinity of the rear end, and the front end side and the rear end side of the rail member are respectively connected to the inner wall surface via dowels. A desk footboard device characterized by being detachably fastened. 5. The foot of a desk according to claim 4, wherein an upwardly-moving arm portion capable of being elastically displaced is integrally provided at an end portion of the rail member, and the dowel at an upper end portion of the arm portion is provided. Board equipment. 6. A pair of rail members attached to opposing inner wall surfaces of a desk body, and a footboard installed between the inner wall surfaces of the rail members with both ends of the lower surface supported on the rail surfaces. , A pair of left and right link members whose front end is pivotally attached to an intermediate position on the lower surface side of the footboard and whose rear end is pivotally supported by the rear end of the rail member, and the footboard being installed. A connecting rod for connecting the rear ends of the link members so as to be located in the vicinity of the rear end of the link member, and notch grooves that open downward are provided on the front end side and the rear end side of the rail member. A footboard device for a desk, characterized in that the rail member is fixed to the inner wall surface by engaging the notch groove with an insertion pin detachably fitted in a holding hole of the inner wall surface. 7. A rail member is hung from a base body having a notch groove, a rib projecting inwardly from the base body and having an upper surface thereof as a rail surface, and a lower surface of the rib substantially parallel to the base body. 7. A hanging piece is provided, and the head of the insertion pin engaged with the notch groove is configured to be held by the base body and the hanging piece. The desk footboard device described.