Furniture grounding device and furniture

Abstract

To provide a highly durable grounding device for furniture, which is suitably used for the furniture such as a school desk and which can properly prevent or inhibit a rattle of the furniture without causing an increase in size.SOLUTION: A grounding device 4 for furniture includes: a housing 5 that is provided on the bottom of the furniture; a rotary member 6 that is supported in a vertically rotatable manner in the housing 5 and in which a grounding body 62 brought into contact with a floor surface is provided on an undersurface side; and an elastic member 7 that is arranged within the housing 5 and that is visco-elastic enough to be compressed by rotation of the rotary member 6.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a furniture grounding device suitable for use in furniture such as school desks, and to furniture having such a grounding device attached to its bottom surface. [Background technology]

[0002] Many conventional school desks are equipped with adjusters to prevent wobbling during use, but those that use normal adjusters have the inconvenience that the adjuster must be properly adjusted every time the desk is moved in order to prevent wobbling (see, for example, Patent Document 1).

[0003] In order to eliminate such problems, a device has been developed that has a grounding body at the end of the adjuster that can be raised and lowered by an oil damper, but oil dampers have low durability and are prone to problems such as oil leaks.

[0004] One possible solution to this problem is a grounding device in which an elastic member is compressed by a grounding body that can be raised and lowered. However, the usual approach would involve compressing the elastic member vertically by the grounding body that can be raised and lowered, which could result in an increase in the size of the device (Problem 1).

[0005] In addition, there is a demand for such a grounding device to be able to appropriately follow the unevenness of the floor surface, and specifically, there are various demands such as a sufficient stroke of the grounding body to quickly respond to the unevenness of the floor surface, and a demand to prevent the desk from being too hard and causing a wobble, or too soft and causing the desk to wobbly during use, etc. However, if a solid elastic member is simply used in a conventional manner, the only way to meet these demands is to select the size and characteristics of the elastic member, and if the dimensions of the device are restricted, there is a difficulty in that there is a limit to how well it can be met (Problem 2).

[0006] Such problems exist not only in school desks used by students, but also in other furniture. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 11-206472 Summary of the Invention [Problem to be solved by the invention]

[0008] The invention according to claim 1 aims to solve the above-mentioned problem 1. The invention according to claim 3 aims to solve the above-mentioned problem 2 in addition to the problem 1. [Means for solving the problem]

[0009] The furniture grounding device of the invention described in claim 1 comprises a housing, a rotating member supported by the housing so as to be rotatable up and down and having a grounding body on its underside that grounds to the floor surface, and an elastic member having viscoelasticity that is disposed within the housing and compressed by the rotation of the rotating member.

[0010] The furniture grounding device of the invention described in claim 2 is the one described in claim 1, wherein the housing has an internal space with a curved ceiling surface corresponding to the rotational trajectory of the rotating member, the elastic member is accommodated in the space of the housing in a curved position along the ceiling surface, and one end of the elastic member is abutted against the upper surface of the rotating member and the other end is abutted against the upright surface of the housing that intersects with the terminal end of the ceiling surface.

[0011] In the present invention, "corresponding to the rotation locus" is not limited to being the same as the rotation locus, but is a concept including being approximated to the rotation locus.

[0012] The furniture grounding device of the invention described in claim 3 is the one described in claim 1 or 2, wherein the grounding body is provided with a grounding cam surface whose contact position with the floor surface changes as the rotating member rotates.

[0013] The furniture grounding device of the invention described in claim 4 is the one described in claim 1, 2 or 3, wherein the rotating member has a support shaft protruding from both sides of its base end, and the support shaft is pivotally supported on both side walls of the housing and arranged at the lower opening of the space.

[0014] The furniture grounding device of the invention described in claim 5 is the one described in claim 4, wherein the rotating member is held within the housing by a lid attached to the underside of the housing, and a window is provided in the lid to allow the grounding member of the rotating member to protrude to the outside.

[0015] The furniture grounding device of the invention described in claim 6 is the one described in claim 4 or 5, wherein the housing and the lid are fastened together to the furniture by a common bolt, and a temporary fastening element is provided between the housing and the lid to prevent the lid from falling off before being fastened by the bolt.

[0016] The furniture grounding device according to the invention recited in claim 7 is the one recited in claim 1, 2, 3, 4, 5 or 6, wherein the elastic member is made of urethane gel, low-resilience urethane or elastomer.

[0017] The furniture according to the invention recited in claim 8 has the furniture grounding devices recited in claims 1, 2, 3, 4, 5, 6 or 7 attached to a plurality of locations on the bottom surface, the furniture grounding devices being expandable and contractable independently of one another.

[0018] The furniture according to the invention recited in claim 9 is the furniture recited in claim 8, wherein the furniture grounding devices are attached to four places on the bottom surface. Effect of the Invention

[0019] According to the present invention, it is possible to provide a highly durable furniture grounding device that can appropriately prevent or suppress rattling of furniture without increasing the size of the furniture. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a side view showing a desk equipped with a grounding device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing a desk equipped with the grounding device according to the embodiment. [Diagram 3] FIG. [Figure 4] 4 is a view taken along the X-arrow in FIG. 3. [Diagram 5] Cross-sectional view taken along line YY in FIG. 4. [Figure 6] FIG. 2 is a perspective view showing the grounding device according to the embodiment. [Figure 7] FIG. 2 is an exploded perspective view showing the grounding device according to the embodiment. [Figure 8] 4A to 4C are diagrams illustrating the operation of the grounding device according to the embodiment. [Figure 9] FIG. 4 is an explanatory diagram showing a compression direction of the elastic member according to the embodiment. [Figure 10] FIG. 4 is a side view showing a grounding device according to another embodiment of the present invention. [Figure 11] 11 is a view taken along the arrow α in FIG. [Figure 12] Cross-sectional view of line β-β in Figure 11. [Figure 13] FIG. 2 is an exploded perspective view showing the grounding device according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] An embodiment of the present invention will be described with reference to FIGS.

[0022] In this embodiment, a furniture grounding device 4 according to the present invention is attached to a school desk D, which is a piece of furniture.

[0023] As shown in Figures 1 and 2, desk D is a desk for school children that is placed on the floor F of a classroom. It has a top board 2 supported by left and right legs 1 and a back panel 3 disposed between the left and right legs 1 near their upper ends.

[0024] As shown in Figures 1 and 2, the left and right legs 1 each have a leg support 12 erected from the inside of the rear end of the leg base 11, and furniture grounding devices 4 are provided at the front and rear ends of the leg base 11, respectively.

[0025] As shown in Figures 3 to 7, the furniture grounding device 4 comprises a housing 5 provided on a leg base 11 which is the bottom part of the furniture, a rotating member 6 supported by the housing 5 so as to be rotatable up and down and having a grounding body 62 on its underside which contacts the floor surface F, and an elastic member 7 having viscoelasticity which is disposed within the housing 5 and compressed as the rotating member 6 rotates upward.

[0026] 5 and 7, the housing 5 has a space 5s formed by curving the ceiling surface 5a in accordance with the rotation locus 6k of the rotating member 6, and an elastic member 7 is accommodated in the space 5s of the housing 5 in a curved position along the ceiling surface 5a. One end 7a of the elastic member 7 abuts against the upper surface 6a of the rotating member 6, and the other end 7b abuts against the upright surface 5b of the housing 5 intersecting the end of the ceiling surface 5a. The housing 5 is a box-shaped unit made of, for example, synthetic resin, and has bolt insertion holes 5c that penetrate vertically at both ends, and has the above-mentioned space 5s in the middle region. The space 5s is open downward, and its ceiling surface 5a is formed outside the rotation locus 6k of the rotating member 6 so as to approximate the rotation locus 6k. Specifically, the ceiling surface 5a is composed of an upright one-end flat surface 5a1, a cylindrical surface 5a2 continuing from the one-end flat surface 5a1, and a horizontal other-end flat surface 5a3 continuing from the cylindrical surface 5a2. The end of the other-end flat surface 5a3 is perpendicular to the vertical upright surface 5b. As shown in Figs. 4 to 7, a peripheral protrusion 5d1 is formed on the periphery of the lower surface, i.e., the bottom surface 5d of the housing 5, and a cover 8, which will be described later, is fitted into the area surrounded by the peripheral protrusion 5d1. The rotating member 6 is accommodated in the bottom of the housing 5 so as to be able to rotate up and down.

[0027] As shown in FIG. 7, the rotating member 6 has a support shaft 61a protruding from both sides of the base end, and the support shaft 61a is pivotally supported in a support groove 5f formed in both side walls 51 of the housing 5, and is disposed in the lower end opening of the space 5s. More specifically, as shown in FIG. 5 and FIG. 7, the rotating member 6 is integrally provided with a member body 61 having a support shaft 61a at the base end and a grounding body 62 protruding from the lower surface of the member body 61, and is made of, for example, synthetic resin. On both inner sides 5e forming the space 5s of the housing 5 described above, support grooves 5f are formed to rotatably support both support shafts 61a of the rotating member 6. The lower ends of both support grooves 5f are open to the bottom surface 5d of the housing 5, and the rotating member 6 can be attached to the housing 5 by engaging both support shafts 61a with both support grooves 5f from below. The grounding body 62 is provided so as to hang down from the member body 61, and a grounding cam surface 62a is formed on the lower surface thereof, the grounding position of which changes with respect to the floor surface F as the rotating member 6 rotates. The grounding body 62 in this embodiment is gradually narrowed toward the lower end. The rotating member 6 is held in the housing 5 by a lid body 8 attached to the bottom surface 5d of the housing 5, and the lid body 8 is provided with a window 8a for projecting the grounding body 62 of the rotating member 6 to the outside. As shown in Figures 6 and 7, the housing 5 and the lid body 8 are plate-shaped and fastened together to the leg base 11 of the desk D by a common bolt 9, and a temporary fastening element K is provided between the housing 5 and the lid body 8 to prevent the lid body 8 from falling off the housing 5 before being fixed by the bolt 9. In this embodiment, the temporary fastening element K is formed by inclining the inner circumferential surface 5d2 of the peripheral ridge 5d1 of the housing 5 and the outer circumferential surface 8b of the cover 8 in a dovetail shape, and the cover 8 is engaged with the inside of the peripheral ridge 5d1 by utilizing temporary elastic deformation of the member. As shown in Figs. 4 to 7, the cover 8 is a rectangular flat plate having screw insertion holes 8c at both ends that match the bolt insertion holes 5c of the housing 5 and the aforementioned window 8a in the middle region. 6c is the rotation center of this rotating member 6.

[0028] The elastic member 7 is made of, for example, low-resilience urethane, and is accommodated in the space 5s of the housing 5 by bending and deforming a rectangular block along the ceiling surface 5a of the housing 5 as shown in Figs. 5 and 7. The elastic member 7 may also be manufactured by punching a thick plate material. In that case, the initial shape will be a curved shape as shown in the example. More specifically, the elastic member 7 in the accommodated state is accommodated in the space 5s of the housing 5 with one end 7a abutting against the upper surface 6a of the rotating end side of the rotating member 6 and the other end 7b abutting against the upright surface 5b of the housing 5.

[0029] The above-described grounding devices 4 are attached to the rear and front ends of the left and right legs 1 of the desk D. Specifically, as shown in Fig. 6, the leg base 11 of each leg 1 is formed with recesses 11a into which the housing 5 can be fitted from below, and the housing 5 fitted into these recesses 11a is fastened together with the cover 8 to the leg base 11 by a common bolt 9. In this embodiment, the grounding device 4 attached to the rear end of the leg base 11 is set so that the rotating end of the rotating member 6 faces backward, and the grounding device 4 attached to the front end of the leg base 11 is set so that the rotating end of the rotating member 6 faces forward.

[0030] When the rotating member 6 touches the ground and rotates, one end 7a of the elastic member 7 is pressed against the upper surface 6a on the rotating end side of the rotating member 6, and the other end 7b is compressed between the upright surface 5b with which it abuts. At this time, the elastic member 7 partially expands due to elastic deformation, but since an expansion allowance is provided in the area above the rotation center 6c in Fig. 5 and the distance between the both side walls 51 of the housing 5 is set larger than the thickness dimension of the elastic member 7 in the unloaded state, an expansion allowance is also provided on both sides in the thickness direction of the elastic member 7, the rotating member 6 can rotate widely while receiving an appropriate resistance from the elastic member 7.

[0031] FIG. 1 is a side view of a desk D on which a plurality of such grounding devices 4 are attached at required locations, and FIG. 2 is a perspective view of the desk D observed from below. FIG. 3 is a side view of one of the grounding devices 4, FIG. 4 is a view taken along the X arrow in FIG. 3, FIG. 5 is a cross-sectional view of the YY line in FIG. 4, and FIG. 6 is a perspective view of the grounding device 4 observed from below. FIG. 7 is an exploded perspective view of the grounding device 4. For convenience of explanation, FIG. 3 to FIG. 6 are illustrated in an unloaded state in which the grounding body 62 is not in contact with the floor surface F, and FIG. 8(a) is a schematic diagram of this state. FIG. 8(b) is a schematic diagram of a state in which the grounding body 62 sinks in response to a reaction force from the floor surface F and the elastic member 7 is compressed. FIG. 9 is an explanatory diagram for comparing the compression direction of the elastic member 7 according to this embodiment (the compression direction line connecting the compression directions of each part is indicated by a) with the compression direction of a virtual elastic member 7 (the compression direction line connecting the compression directions of each part is indicated by b).

[0032] With such a configuration, the grounding body 62 is caused to protrude and sink into the floor surface F by the elastic repulsive force of the viscoelastic elastic member 7, so there is no need to worry about oil leakage and higher durability can be ensured compared to a hydraulic damper type grounding device.

[0033] Moreover, since the elastic member 7 is compressed by the grounding body 62 that rotates instead of the grounding body 62 that moves in the vertical direction, it is possible to make the compression direction of the elastic member 7 nonlinear by corresponding to the rotation trajectory 6k of the rotating member 6. Therefore, even if the substantial length dimension of the elastic member 7 in the compression direction is secured to be large, the increase in the height dimension of the entire grounding device can be suppressed, which is convenient when the grounding device is housed in the leg base 11, for example, as in this embodiment. Specifically, the substantial length dimension of the elastic member 7 in the compression direction of this embodiment corresponds to the length dimension of the curved line a in FIG. 9, but if a linear columnar elastic member 7 having the same length dimension in the compression direction (the length dimension of the line segment b in FIG. 9) is used, the height dimension of the entire grounding device must be large. Therefore, according to the grounding device 4 of the present invention, it is possible to naturally promote the compactification of the entire device. That is, according to the configuration of this grounding device 4, it is possible to naturally reduce the vertical dimension of the entire device compared to the case where a linear elastic member is compressed in the vertical direction by a grounding body that rises and falls linearly.

[0034] In addition, since the grounding body 62 is formed with the grounding cam surface 62a, the grounding position with respect to the floor surface F changes with the rotation of the rotating member 6, the relationship between the distance dimension of the housing 5 from the floor surface F and the compression dimension of the elastic member 7 by the rotating member 6 can be set to a relationship other than direct proportionality. Therefore, by changing the shape of the cam surface 62a in various ways, it is possible to change the elastic rebound characteristics of the elastic member 7, and there is an advantage that it is easy to design a grounding device 4 having optimal characteristics. That is, according to the configuration of this grounding device 4, the grounding position of the grounding body 62 changes with the change in the compression dimension of the elastic member 7, so by changing the shape of the cam surface 62a of the grounding body 62, the relationship between the compression dimension of the elastic member 7 and the lift dimension of the housing 5 can be adjusted. Therefore, it is easy to set the elastic rebound characteristics of the elastic member 7 to an optimal one.

[0035] Furthermore, in this embodiment, low-resilience urethane is used as the elastic member 7, so that the elastic member 7 can function as both a spring and a damper. This makes it possible to effectively prevent the entire desk D from continuing to rock, and also makes it possible to quickly respond to unevenness in the floor surface F by pushing and sinking the contact body 62 with a relatively large stroke.

[0036] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit and scope of the present invention.

[0037] For example, a furniture grounding device A4 having the following configuration may be considered with reference to Figs. 10 to 13.

[0038] This differs from the furniture grounding device 4 of the above-mentioned embodiment in the following respects, but has the same configuration as the furniture grounding device 4 of the above-mentioned embodiment in other respects. The same reference numerals are used to designate the same or corresponding parts to those in the furniture grounding device 4 of the above-mentioned embodiment, and the description thereof will be omitted.

[0039] This furniture grounding device A4 comprises a housing A5 provided at the bottom of the furniture, a rotating member 6 supported by the housing A5 so as to be rotatable up and down and having a grounding body 62 on its underside which contacts the floor surface, and an elastic member 7 having viscoelasticity that is disposed within the housing A5 and compressed as the rotating member 6 rotates upward.

[0040] As shown in Figures 12 and 13, the housing A5 has a space A5s in which the ceiling surface A5a is curved in accordance with the rotation locus 6k of the rotating member 6, and the elastic member 7 is accommodated in the space A5s in a curved position along the ceiling surface A5a. The housing A5 is a box-shaped unit made of, for example, synthetic resin, has bolt insertion holes A5c penetrating vertically at both ends, and has the above-mentioned space A5s in the middle region. The space A5s is open downward, and the ceiling surface A5a is formed outside the rotation locus 6k of the rotating member 6 so as to approximate the rotation locus 6k. Specifically, the ceiling surface A5a is composed of an upright one-end flat surface A5a1, a cylindrical surface A5a2 continuous with the one-end flat surface A5a1, and a horizontal other-end flat surface A5a3 continuous with the cylindrical surface A5a2. The end of the flat surface A5a3 on the other end side is perpendicular to the vertical upright surface A5b. As shown in Figs. 12 and 13, a protrusion A5d1 is formed on the lower surface, i.e., the bottom surface A5d of the housing A5 so as to surround the opening edge of the space A5s, and an engagement protrusion A52 that can elastically engage with an engagement recess A8d of the cover A8 described later is protruded from the outer circumferential surface of the protrusion A5d1. The bottom of the housing A5 having such a configuration accommodates the rotating member 6 so as to be vertically rotatable. Specifically, pivot grooves A5f are formed on both inner side surfaces A5e (inner surfaces of both side walls A51) that form the space A5s of the housing A5, and both support shafts 61a of the rotating member 6 are rotatably supported by the pivot grooves A5f. The rotating member 6 is held in the housing A5 by the cover A8 attached to the bottom surface A5d of the housing A5.

[0041] The cover A8 is a plate-like body having a window A8a for projecting the grounding body 62 of the rotating member 6 to the outside. The housing A5 and the cover A8 are fastened together, for example, to the leg base of a desk by a common bolt 9 as shown in FIG. 13. A temporary fastening element K2 is provided between the housing A5 and the cover A8 to prevent the cover A8 from falling off the housing A5 before the fastening by the bolt 9. In this embodiment, the temporary fastening element K2 is formed by elastically engaging an engagement protrusion A52 provided on the outer peripheral surface of the protrusion A5d1 of the housing 5 with an engagement recess A8d provided on the inner peripheral surface of the cover A8. As shown in FIG. 10, FIG. 11 and FIG. 13, the cover A8 is a rectangular flat plate-like body having screw insertion holes A8c at both ends that match the bolt insertion holes A5c of the housing A5, and the aforementioned window A8a in the middle region.

[0042] Here, Fig. 10 is a side view showing one of the grounding devices A4. Fig. 11 is a view seen from the arrow α in Fig. 10, and Fig. 12 is a cross-sectional view taken along the line β-β in Fig. 11. And Fig. 13 is an exploded perspective view of the grounding device A4. For convenience of explanation, Figs. 10 to 12 are shown in an unloaded state in which the grounding body 62 is not in contact with the floor surface F.

[0043] Even with this configuration, it is possible to obtain the same effects as those obtained with the furniture grounding device 4 of the above-described embodiment.

[0044] Furthermore, in this embodiment, the housing A5 has different height dimensions (depth dimension of the bolt insertion hole A5c, dimension of the screw intake portion) at both ends where the bolt insertion hole A5c is provided at one end and the other end, and correspondingly, the depth of the recess on the furniture side into which the housing A5 can be fitted from below is made different at one end and the other end, thereby making it possible to guide the furniture grounding device A4 to be installed only in a pre-specified orientation.

[0045] In addition, the following modifications are also possible.

[0046] For example, in the illustrated embodiment described above, the housing has an internal space with a curved ceiling surface corresponding to the rotation trajectory of the rotating member, and the elastic member is accommodated in the space of the housing in a curved position along the ceiling surface, but the structure for holding the elastic member is not necessarily limited to this. However, with such a configuration, the elastic member can be inserted and held in the housing in a position suitable for compression, which can simplify the structure and minimize the number of assembly steps.

[0047] In addition, in the illustrated embodiment, the rotating member has a support shaft protruding from both sides of the base end, and the support shaft is pivotally supported on both side walls of the housing and disposed at the lower end opening of the space, but the pivot structure of the rotating member is not limited to this. However, if a configuration such as that of the illustrated embodiment is adopted, the rotating member can be easily attached to the housing, and the number of parts can be reduced compared to when a separate support shaft is used.

[0048] Furthermore, the holding structure of the rotating member is not limited to the illustrated embodiment, but if it is as in the illustrated example, the installation of the rotating member is completed at the same time as closing the lower surface of the housing, so that the configuration can be simplified. In particular, if the housing and the lid are fastened together to the furniture, i.e., the desk, by a common bolt, as in the illustrated embodiment, it is possible to prevent the structure from becoming complicated and to reduce the number of parts. Moreover, if a temporary fastening element is provided between the housing and the lid to prevent the lid from falling off before being fixed by the bolt, as in the illustrated embodiment, it becomes easier to manage the parts before assembly, and the work of assembling the grounding device to the desk is also simplified.

[0049] Furthermore, the elastic member is not limited to that in the illustrated embodiment, and may be made of, for example, urethane gel or elastomer.

[0050] The furniture to which the grounding device of the present invention is attached is not limited to school desks, but various types of office desks, tables, shelves, counters, partitions, telephone stands, etc. Student desks are frequently moved and are often used in situations that require concentration, such as for exams and tests, so they are required to quickly and automatically eliminate any wobbling or bouncing whenever they are moved, making them the ideal application for the grounding device of the present invention.

[0051] The furniture such as a desk according to the invention described in claim 8 has the above-mentioned furniture grounding devices that expand and contract independently of one another attached to multiple points on the bottom surface, and therefore can obtain the following effects: That is, even if any of the grounding points is higher or lower than the floor surface, the furniture grounding devices expand and contract independently of one another, so that the furniture as a whole can maintain balance and follow the floor surface.

[0052] In particular, when the furniture is a desk as in the above-described embodiment, by attaching the above-described furniture grounding devices to four points on the bottom surface, the following effects can be obtained. That is, in any of the cases where one grounding point is higher (or three are lower) than a horizontal floor surface, two grounding points are higher or lower, or one grounding point is lower (or three are higher), the furniture grounding devices expand and contract independently, so that the furniture as a whole can maintain balance and follow the floor surface.

[0053] In addition, various modifications may be made without departing from the spirit of the present invention. [Explanation of symbols]

[0054] D…Furniture (desk) 11…Furniture bottom (leg base) 4, A4...Furniture grounding device 5, A5…Housing 51...Side wall 5a…Ceiling surface 5b...Elevating surface 5d…bottom surface 5s…space 6... Rotating member 61a...Spindle 62...Grounding body 62a…Contact cam surface 6a...Upper surface of rotating member 7...Elastic member 7a...One end of elastic member 8…Lid body 8a…Window 9…Bolt K, K2: Temporary fastening element F…Floor surface

Claims

1. A furniture grounding device comprising: a housing; a rotating member supported by the housing so as to be rotatable up and down and having a grounding body on its underside which contacts the floor surface; and an elastic member having viscoelasticity disposed within the housing and compressed by the rotation of the rotating member.

2. the housing has a space therein, the ceiling surface of which is curved in accordance with the rotation trajectory of the rotating member, the elastic member is accommodated in the space of the housing in a curved position along the ceiling surface, 2. The furniture grounding device according to claim 1, wherein one end of the elastic member is in contact with the upper surface of the rotating member, and the other end is in contact with an upright surface of the housing that intersects with an end of the ceiling surface.

3. 3. The furniture grounding device according to claim 1, wherein the grounding body has a grounding cam surface whose grounding position with respect to the floor surface changes with the rotation of the rotating member.

4. 4. The furniture grounding device according to claim 1, 2 or 3, wherein the rotating member has a support shaft protruding from both sides of its base end, the support shaft being pivotally supported on both side walls of the housing and disposed at the lower end opening of the space.

5. 5. The furniture grounding device according to claim 4, wherein the rotating member is held within the housing by a lid attached to the underside of the housing, and the lid is provided with a window for allowing the grounding member of the rotating member to protrude to the outside.

6. The furniture grounding device according to claim 4 or 5, wherein the housing and the lid are fastened together to the furniture by a common bolt, and a temporary fastening element is provided between the housing and the lid to prevent the lid from falling off before being fastened by the bolt.

7. 7. The furniture grounding device according to claim 1, 2, 3, 4, 5 or 6, wherein said elastic member is made of urethane gel, low-resilience urethane or elastomer.

8. A piece of furniture having the furniture grounding device according to any one of claims 1 to 7 attached to a plurality of locations on the bottom surface thereof, the furniture grounding device being extendable and retractable independently of one another.

9. 9. The furniture according to claim 8, wherein the furniture grounding device is attached to four locations on the bottom surface.

Images