JP3397633B2 - Seismic isolation stand - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolated self-supporting shelf that can easily return an seismic isolated self-supporting shelf that has been moved from its original position due to an earthquake or the like to its original position.

[0002]

2. Description of the Related Art In order to provide a self-supporting shelf with a seismic isolation function, a seismic-isolating self-supporting shelf that can freely move relative to an installation floor has been considered. FIG. 11 shows an example of a conventional so-called single pillar type free shelf to which a seismic isolation function is added. 11A and 11B, the free shelves on which articles and the like are placed are mainly the base 72, the columns 73, and the shelf receiver 7.
4, the shelf plate 75 and other members. this house,
As shown in FIG. 11 (b), the base 72 is a member having a shape protruding toward the front side and the rear side.
The height dimension is gently lowered and becomes an oblique shape. A plurality of such bases 72 are arranged side by side at regular intervals in the front surface direction. Although not shown, a protrusion protruding upward is provided at the center of the front and rear portions of each base 72, and a column 73 is attached to the protrusion. The pillar 73 is in the shape of a rectangular tube, and has a hole that is slightly larger than the protruding portion of the base 72 inside. Therefore, the columns 73 are attached to the respective bases 72 by inserting the holes of the columns 73 into the outer surfaces of the projections of the bases 72 and fixing them with fastening members (not shown). The base 72 and the pillars 73 form the legs of the shelving device. A plurality of legs of the shelving device are arranged side by side. In addition, casters 72a, 72a are attached to the lower side of the portion of the base 72 projecting to the front side and the rear side.

The legs of the plurality of shelving devices arranged side by side are connected to each other by a connecting upper member 70 and a connecting lower member 7.
Adjacent feet are connected by 9. Among them, the connecting upper member 70 is used to fix the upper ends of the columns 73 to each other. Also, the connecting lower member 7
9 is used to fix adjacent bases 72. In this way, the skeleton of the shelving device is configured by connecting and fixing mutually adjacent foot portions with the connecting upper member 70 and the connecting lower member 79 interposed therebetween.

On both sides in the width direction of each column 73 of the shelf device, that is, on the front side and the back side of the paper surface in FIG.
Although not shown, a plurality of holes are provided in a dotted line at equal intervals in the vertical direction. A shelf is attached to a specific hole of the plurality of holes provided in the support column 73. The shelf is composed of a pair of shelf receivers 74, 74 and a shelf board 75 whose both ends are supported by the shelf receivers 74, 74. The shelf is formed by hooking a hook-shaped protrusion provided on the back surface of the shelf receiver 74, 74 into a hole provided in the pillar 73, 73,
It is attached to 3, 73. Further, the shelves can be easily detached from the columns 73 and assembled, and the number of shelves to be assembled can be changed according to the application. As described above, a complete shelf body is configured by attaching a plurality of shelves including the shelves 74, 74 and the shelves 75 to the skeleton of the shelving device.

Casters 72a, 72a are attached to the front and rear portions of the bases 72, and the casters 72a, 72a make the shelves self-supporting. Therefore, when the installation floor shakes due to an earthquake, etc. The shelves move relative to the installation floor by the casters 72a, 72a, and seismic energy is not transmitted to the self-supporting shelves, so that the stored items can be protected from the earthquake. In addition,
Other appropriate seismic isolation means may be used instead of the casters 72a, 72a.

[0006]

However, the seismic isolation stand-alone shelf as described above moves relatively to the floor due to the seismic isolation effect of the casters 72a when floor vibration occurs due to an earthquake, etc. Even if there is a seismic isolation effect, it is not easy to return to the original position because it is displaced from the predetermined position. Also, if the movement of the self-supporting shelf due to the earthquake is not restricted, the self-supporting shelf will move greatly from the original position, and it will be even more difficult to return it to the original position.

The present invention has been made in order to solve the above problems of the prior art, and it is possible to easily return the seismic isolated stand-alone shelf moved by an earthquake to its original position. The purpose is to provide. Moreover, it aims at providing the seismic isolation stand-alone shelf which can restrict the movement of the seismic isolation stand-alone shelf by an earthquake.

[0008]

The invention according to claim 1 is
In a seismically isolated stand-alone shelf that can move freely relative to the installation floor, the above-mentioned installation due to an earthquake
Seismic isolation due to floor vibration
A movement restriction device that restricts the lower part of the standing shelf by contacting it
Is installed under the seismic isolation stand.
It extends in the longitudinal direction of the seismic self-supporting shelf and the longitudinal center part is installed.
It is attached to the floor and both ends in the longitudinal direction are straight in the longitudinal direction.
It extends in the intersecting direction and becomes a contact part with the bottom of the seismic isolation stand-alone shelf.
And is horizontal centered on the longitudinal center position
It is characterized in that it can rotate in a plane .

[0009]

[0010]

[0011] According to a second aspect of the invention of claim 1 Symbol placement, the movement restriction device, and being movable parallel to the depth direction of the seismic isolation freestanding shelves within a certain range .

The invention according to claim 3 is the invention according to claim 1 or 2.
In the invention described above, the seismic isolation freestanding shelf and the movement restricting device are provided with a connecting portion of a return tool for returning the seismic isolation freestanding shelf to the original position.

According to a fourth aspect of the present invention, in the first, second or third aspect of the invention, the movement restricting device is characterized in that both arm portions extending in the longitudinal direction of the seismic isolation stand-alone shelf are elastic bodies. And

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a seismic isolation freestanding shelf according to the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 is a bottom portion 2 of the seismic isolation freestanding shelf.
The frame body provided around is shown. This frame 1
Has a rectangular frame shape whose length dimension is extremely long with respect to the depth dimension, and the cross-section of each of the four sides is formed in a U shape, and its lower inner edge is bent upward to form a hook. It is a bent portion 1a. FIG. 2 shows a side view seen from the direction of the arrow α shown in FIG.

As shown in FIG. 10, the bottom surface 2 of the frame 1 is
A hole 1b is formed at a predetermined position of a portion contacting with
The caster 3 is attached to the bottom surface 2 of the seismically isolated stand-alone shelf by penetrating the support shaft 3a of the caster 3 through the hole 1b. This caster 3 is for moving the seismic isolation freestanding shelf in a horizontal plane. In FIG. 2, the caster 3
Shows an example of being attached to both ends of the seismic isolation stand-alone shelf in the depth direction.

The casters 3 are provided at appropriate positions at both ends in the lengthwise direction of the seismic isolation self-supporting shelf and further at the intermediate portion in the lengthwise direction.
As is well known, in the caster 3, the roller is rotatably supported by a horizontal shaft provided at a position laterally displaced from the axis of the support shaft 3a, and the support shaft 3a is freely rotatable. The roller can be rolled in any direction.

A base plate 51 is mounted on the installation floor 50 immediately below the seismic isolation freestanding shelf.
A movement restriction device 4 is provided below the bottom surface 2 of the seismic isolation self-supporting shelf. In the example shown in FIG. 1, two movement restriction devices 4 are provided on both sides in the longitudinal direction of the seismic isolation self-supporting shelf.

As shown in FIGS. 1 and 2, the movement restricting device 4 extends in the longitudinal direction of the seismic isolation freestanding shelf, and the central portion 40 in the longitudinal direction is fixed by the anchor bolt 41 to the base plate 51 and the installation floor 50. Is rotatably mounted in the horizontal plane. Plate members 43, 43 made of two elastic plates extend from the central portion 40 in mutually opposite directions and in the longitudinal direction of the seismic isolation freestanding shelf. This plate material 43, 4
3 is reinforced by a support member 44 which is applied to both sides at the center of the plate members 43, 43 in the lengthwise direction and is fastened to each other by bolts or the like.

At both ends of the plate members 43, 43, elastic members 42, 42 extending in a direction perpendicular to the longitudinal direction of the seismic isolation self-supporting shelf.
3 are fixed, and both ends of the plate members 43, 43 are formed in a T shape together with the elastic bodies 42, 42 as shown in FIGS. The elastic members 42, 42 at both ends of the plate members 43, 43, more specifically at both ends of the plate members 43, 43,
As will be described later, it is a contact portion with the frame body 1. The elastic bodies 42, 42 are made of rubber, sponge, elastic resin, or the like, and function as a cushioning agent at the time of contact with the frame body 1.

FIG. 5 shows the frame body 1 of the seismic isolation freestanding shelf in a predetermined position (original position) before being moved by an earthquake. In this state, the second connecting portion 22 of the return tool 20 is attached to the central portion 40 of the movement restricting device 4. On the other hand, the first connecting portion 21 of the restoring tool 20 for returning the seismic isolated stand-alone shelf described later to the original position is attached to the position of the shortest distance from the second connecting portion 22 of the frame 1 of the seismic isolated stand-alone shelf. Has been. As the first connecting portion 21 and the second connecting portion 22, for example, a screw member having a ring-shaped head can be used.

A so-called turnbuckle can be used as the return tool 20. The turnbuckle includes a screw 20b and a screw 20b at both ends of an elliptical ring-shaped nut 20a.
c is screwed in, and when one is a right screw 20b, the other is a left screw 20c. Therefore, by rotating the nut 20a clockwise or counterclockwise,
The tension can be adjusted by changing the mutual distance between the right screw 20b and the left screw 20c.

By engaging the hooks at the ends of the right screw 20b and the left screw 20c with the first connecting portion 21 and the second connecting portion 22, one side of the frame 1 of the seismic isolation freestanding shelf and the movement restricting device 4 Are connected, and by rotating the nut 20a, one side of the frame 1 of the seismic isolation freestanding shelf and the movement restricting device 4 can be attracted to a predetermined distance.

As will be described later, the return tool 20 is used to return the seismic isolated stand-alone shelf moved by the vibration of the earthquake to the original position before the vibration, and the right screw 20
By rotating the nut 20a with respect to b and the left screw 20c, one side of the frame 1 of the seismic isolation freestanding shelf and the movement restricting device 4
The seismic isolation freestanding shelf can be accurately and easily returned to its original position before the earthquake.

Next, the operation of the embodiment of the present invention will be described. When the installation floor 50 vibrates due to an earthquake or the like, the seismic isolation effect of the casters 3 causes the seismic isolation freestanding shelf to move relative to the installation floor 50. Therefore, the seismic isolation stand-alone shelf after the earthquake is displaced from the predetermined position before the earthquake. As shown in FIG. 4, if the seismic isolation freestanding shelf at a predetermined position before the earthquake indicated by the broken line slides while rotating in the direction of arrow β due to vibration, the frame 1 of the seismic isolation freestanding shelf is shown.
The bent portion 1a shown in FIG. 2 on one side is in contact with the elastic bodies 42, 42 on one end side in the length direction of the movement restricting devices 4, 4.

When the seismically isolated self-supporting shelf slides in the direction of arrow β while rotating further from such a state, the elastic body 42 on the one end side of the movement restricting device 4 is pushed by the bent portion 1a of the frame body 1. , The central portion 40 of the movement restricting device 4 is rotated by an angle at which the frame body 1 of the seismic isolation self-supporting shelf comes into contact with the elastic bodies 42, 42 at both ends of the seismic isolation self-supporting shelf. The bent portion 1a on one side of the frame 1 has a movement restricting device 4,
4 is brought into contact with the elastic bodies 42, 42 at both ends. When the seismic isolation freestanding shelf slides further from this state in the direction of the arrow β, the frame body 1 of the seismic isolation freestanding shelf moves on both sides of the plate members 43, 43 of the movement restricting devices 4, 4 as shown by the solid line in FIG. Press the arms in a bent state.

As described above, since both arms of the plate member 43 have elasticity, the frame body 1 of the seismic isolation self-supporting shelf is in a state where the plate members 43 and 43 of the movement restricting devices 4 and 4 are bent. When pressed, a resistance force that pushes the frame body 1 of the seismic isolation freestanding shelf in the direction opposite to the arrow β direction by the elastic force of both arm portions of the plate members 43, 43, and the seismic isolation freestanding shelf itself causes an earthquake. Slide halfway toward the front predetermined position.

When the earthquake subsides, the seismic isolation freestanding shelf is displaced from the predetermined position before the earthquake, so that the hooks of the right screw 20b and the left screw 20c of the turnbuckle are connected to the first connecting portion 21 as described above. By engaging the second connecting portion 22 to connect the frame body 1 of the seismic isolated self-supporting shelf and the movement restricting device 4 and rotating the nut 20a of the turnbuckle, the seismic isolated self-supporting shelf is returned to the original state before vibration. Return to position. As a matter of course, the two sides of the frame body 1 located on both sides of the movement restricting device 4 are different from each other in the distance from the movement restricting device 4. Therefore, the turnbuckle is set to the wider one to set the distance. Move in the direction of narrowing.

As described above, the plate member 43 of the movement restricting device 4
Since the seismic isolation stand-alone shelf is returned to a predetermined position before the earthquake along with the frame body 1 by the elastic force of both arms of, the movement of the seismic isolation stand-alone shelf due to the earthquake can be limited to a limited range. Therefore, the returning work to the original position using the returning tool 20 such as a turnbuckle becomes easy.

Although the central portion 40 in the longitudinal direction of the movement restricting device 4 rotates in the horizontal plane in the above-mentioned embodiment, the central portion 40 may not rotate. In this case, for example, as shown in FIG. 4, if the seismic isolation self-supporting shelf slides while rotating in the direction of arrow β, the seismic isolation self-sustaining is achieved by the elastic force of the outer arm of the movement restricting device 4, 4. The shelf itself is slid halfway toward a predetermined position before vibration.

Further, a plurality of first connecting portions 21 or second connecting portions 22 as shown in FIG. 5 are provided, and each of the first connecting portions 21 or the second connecting portions 22 has a right screw 20b and a left screw of the restoring tool 20. 20c may be engaged. When only one of the above-mentioned restoration tools 20 is used, as shown in FIG.
The second connecting portion 22 is attached near 0, and the first connecting portion 21 is located at the shortest distance from the second connecting portion 22 of the frame 1 of the seismic isolation self-standing shelf.
To attach the first connecting portion 21 and the second connecting portion 2
It is desirable to engage the return tool 20 with the 2.

Further, as shown in FIG. 6, the seismic isolation self-supporting shelves may be coupled by connecting the ceiling portions of a plurality of seismic isolation self-supporting shelves arranged in parallel with each other by the connecting member 60. This makes it possible to reliably prevent the self-standing shelf from falling. In this case, the movement restriction device 4 may be provided under each seismic isolation freestanding shelf. The displacement of the seismic isolation freestanding shelf due to the earthquake occurs not only in the depth direction of the seismic isolation freestanding shelf but also in the longitudinal direction of the seismic isolation freestanding shelf. Therefore, in order to correct the displacement in the longitudinal direction of the seismic isolation self-standing shelf and return it to the original position, as shown in FIG. 3, a bolt 60 with a ring as a connecting portion is provided at the end of the movement restricting device 4 in the longitudinal direction. Screw it in.
Hang the return tool between the ring part of the and the frame of the seismic isolation freestanding shelf,
It is advisable to move the seismically isolated stand-alone shelf in the longitudinal direction by operating the return tool.

Here, assuming a large-scale earthquake with an amplitude of ± 20 cm or more, for example,
The seismically isolated stand-alone shelf has a large depth of 50 cm at most.
Therefore, if the movement limiting device 4 as described above is arranged within this depth dimension, it is possible that the seismic isolation stand-alone shelf collides with the movement limiting device 4 in the event of a large-scale earthquake. Therefore, as shown in FIG. 9, the movement restricting device 4 is moved in parallel within a certain range so that the seismic isolation standing shelf does not collide with the movement restricting device 4 even if the amplitude of the earthquake is large relative to the depth dimension of the seismic isolation standing shelf. It is good to enable it. Hereinafter, the embodiment thus configured will be described.

In FIG. 7, a holder 30 is provided at the center of the movement restricting device 4 in the longitudinal direction. From this holder 30, plate members 43, 43 made of two elastic plates are provided in opposite directions, and seismic isolation is provided. It extends in the longitudinal direction of the self-standing shelf. A recess 31 is formed on the lower surface of the holder 30 in a direction perpendicular to the longitudinal direction. A plate 33 having a long hole 32 formed in a direction perpendicular to the longitudinal direction is integrally attached to the lower surface of the holder 30 by welding or the like so that the recess 31 and the long hole 32 overlap.

An anchor bolt 41 is embedded in the installation floor 50 through the washer 34, the long hole 32 of the plate 33 and the base plate 51 on the installation floor 50. The head of the anchor bolt 41 is housed in the recess 31 formed in the holder 30. The plate 33 has its long hole 32
It is possible to move relative to the anchor bolt 41 within the range. Therefore, the movement restricting device 4 can move in parallel with the plate 33 in a direction perpendicular to the longitudinal direction of the seismic isolation self-supporting shelf, that is, in the depth direction of the seismic isolation self-supporting shelf, and also with the anchor bolt 41 as a fulcrum. It can also rotate inside.

When a large vibration occurs due to an earthquake, the seismic isolation freestanding shelf slides greatly. If the movement limiting devices 4 and 4 cannot move in parallel, for example, as shown in FIG.
As shown by the solid line, even if the frame body 1 of the seismic isolation freestanding shelf is pressed against the plate members 43, 43 of the movement restricting devices 4, 4 in a pressed state, the seismic isolation freestanding shelf is further moved in the direction of the arrow β. Try to slide. Therefore, the seismic isolation freestanding shelf collides with the movement restricting device 4, the seismic energy is transmitted to the seismic isolation freestanding shelf, and the stored articles may be overturned or destroyed. However, in the embodiment shown in FIG. 7, since the movement restricting device 4 can move in parallel in the depth direction of the seismic isolation freestanding shelf, it is possible to prevent the seismic isolation freestanding shelf from colliding with the movement restricting device 4. it can. Further, after the movement restricting device 4 has moved in parallel within a predetermined range, both arm portions of the plate members 43, 43 are pushed and bent by the frame body of the seismic isolation freestanding shelf, and the seismic isolation freestanding shelf moves unintentionally. Restrict the.

The structure for moving the movement limiting device 4 in parallel may be as follows. As shown in FIG. 8, plate members 43, 43 made of two elastic plates extend from the holder 30 at the center of the movement restricting device 4 in mutually opposite directions and in the longitudinal direction of the seismic isolation freestanding shelf. On the lower surface of the holder 30, a sliding member 36 having a stepped long hole 37 having a T-shaped cross section in a direction perpendicular to the longitudinal direction is integrally attached by welding or the like.

A recess is formed on the installation floor 50 in a direction perpendicular to the longitudinal direction, and a plate 38 having a U-shaped cross section is fixed to the recess. The sliding member 36 is fitted into the plate 38. The anchor bolt 41 is
The head portion is housed in the sliding member 36, passes through the washer 39 and the long hole 37 of the sliding member 36, and the installation floor 50
Is mounted on.

Therefore, the movement restricting device 4 can move in parallel with the sliding member 36 in a direction perpendicular to the longitudinal direction of the seismic isolation freestanding shelf, that is, in the depth direction of the seismic isolation freestanding shelf.
It is also possible to rotate in the horizontal plane using the anchor bolt 41 as a fulcrum. By being configured in this way, FIG.
It is possible to obtain the same effect as that of the embodiment shown in FIG.

In the above-described embodiment, the frame body provided at the lower portion of the seismic isolation freestanding shelf contacts the movement restricting device, but not limited to the frame body, the lower portion of the seismic isolation freestanding shelf itself. Alternatively, it is also possible to allow a member provided on the lower portion to abut on the movement restricting device.

[0040]

Effects of the Invention According to the present invention Symbol mounting, in seismic isolation freestanding shelf can be freely moved relative to the mounting bed, the said installation floor, moving under the seismic isolation freestanding ledge A seismically isolated self-supporting shelf due to an earthquake is provided with a restricting device to limit the relative movement of the seismic isolated self-supporting shelf caused by the vibration of the installation floor due to an earthquake by the lower part of the seismic isolated self-supporting shelf contacting the movement restricting device. Can be restricted to a minimum. Further, since the movement limiting device is rotatable in the horizontal plane about the center position in the longitudinal direction, when the seismic isolation freestanding shelf rotates in the horizontal plane instead of in parallel due to an earthquake, both ends of the movement limiting device are contact the bottom of the seismic isolation freestanding shelves, it can be limited more reliably moved.

[0041]

According to the second aspect of the present invention, since the movement restricting device can move in parallel within the predetermined range in the depth direction of the seismic isolation self-supporting shelf, the seismic isolation self-sustaining can be achieved when a large vibration occurs due to an earthquake. It is possible to prevent the shelves from colliding with the movement restriction device, and the seismic energy is transmitted to the seismic isolation freestanding shelves.
It is possible to prevent the stored articles from falling over or being destroyed. Also, after the movement restricting device has moved in parallel within a predetermined range, both arm portions of the plate material of the movement restricting device and the lower part of the seismic isolation self-supporting shelf come into contact with each other, while flexing the both arm portions, the seismic isolation self-supporting shelf. You can limit the amount of time you move.

According to the third aspect of the present invention, the seismic isolation freestanding shelf and the movement restricting device are provided with the connecting portion of the return tool for returning the seismic isolation freestanding shelf to the original position. You can easily restore the seismic isolated stand-alone shelf to its original position before the earthquake by using a tool.

According to the invention as set forth in claim 4 , in the movement restricting device, both arms extending in the longitudinal direction of the seismic isolation self-supporting shelf are elastic members, so that the seismic isolation device moves toward the original position. Since the self-supporting shelf is returned, the seismic isolated stand-alone shelf can be returned to its original position.

[Brief description of drawings]

FIG. 1 is a bottom view showing an embodiment of a seismic isolation freestanding shelf according to the present invention.

FIG. 2 is an enlarged side view showing the above embodiment.

FIG. 3A is a plan view and FIG. 3B is a front view showing an end portion of a movement limiting device applicable to the above-described embodiment.

FIG. 4 is a bottom view showing the operation of the above embodiment.

FIG. 5 is a plan view showing a return tool applicable to the above embodiment.

FIG. 6 is a front view showing another example of the seismic isolation freestanding shelves, which are another embodiment of the present invention and are connected to each other.

7A is a plan view and FIG. 7B is a sectional view showing an example of a central portion of a movement restricting device applicable to the above-described embodiment.

8A is a plan view and FIG. 8B is a cross-sectional view showing another example of the central portion of the movement restricting device applicable to the above embodiment.

FIG. 9 is a bottom view showing a state in which the movement restricting device applicable to the above-described embodiment moves in parallel in the depth direction of the seismic isolation stand-alone shelf.

FIG. 10 is a front view showing a caster applicable to the above embodiment.

FIG. 11 is a front view showing a conventional shelving device, and FIG.
Is a side view.

[Explanation of symbols]

1 frame 3 casters 4 movement restriction device 20 Restoration tool 33 plates 40 center 41 anchor bolt 43 plate material 50 fixed floor 51 base plate

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takuya Nakamura 3-8-1, Kamiakumamoto, Kumamoto-shi, Kumamoto Within Kongo Corporation (56) References JP-A-9-98854 (JP, A) JP-A 10-117872 (JP, A) Actual development Sho 60-65051 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) A47B 97/00 A47B 53/02 501 A47B 55/00

Claims (4)

(57) [Claims] 1. A seismically isolated stand-alone shelf that can freely move relative to the installation floor, wherein the installation floor is exposed to the vibration of the installation floor due to an earthquake.
The above-mentioned seismic isolation stand-alone shelf relative movement
Movement limiting device above seismic isolation to but limits by contacting
Installed under the self-supporting shelf, the movement restriction device extends in the longitudinal direction of the seismic isolation self-supporting shelf.
And the central part in the longitudinal direction is attached to the fixed floor,
Both ends in the longitudinal direction extend in the direction orthogonal to the longitudinal direction.
It is a contact part with the lower part of the seismic isolation stand-alone shelf and is long
A seismic isolation freestanding shelf characterized by being rotatable in a horizontal plane about a center position in the direction . <br /> 2. The movement restricting device is controlled within a certain range.
The seismic isolated stand-alone shelf according to claim 1, wherein the seismic isolated stand- alone shelf can be moved in parallel in a depth direction . Wherein the above seismic isolation freestanding rack and the movement restriction device
Is a return to restore the seismic isolation stand-alone shelf to its original position.
Claim, characterized in that the connecting part of the sushi is provided 1
Or the seismic isolation freestanding shelf described in 2 . 4. The movement restriction device is provided on the seismic isolation freestanding shelf.
The seismically isolated self-supporting shelf according to claim 1, 2, or 3, wherein both arms extending in the longitudinal direction are elastic bodies .