JP6307562B2 - Floor joint device - Google Patents

Description

  The present invention relates to a floor joint device for closing a joint portion.

  Conventionally, as a floor joint device for closing the joint portion of the floor portion between the housings, “a plurality of both end portions attached to the floor housing on the joint portion side of the left and right floor housings provided via the joint portions at predetermined intervals. For a floor comprising a joint cover support mechanism that can be expanded and contracted, and a joint cover device that is attached to the joint cover support mechanisms and that has at least two joint covers that overlap each other. In the joint device, the plurality of joint cover support mechanisms are attached to the one joint portion side floor frame at rear ends thereof at predetermined intervals so that the front end portion can be rotated in the vertical and horizontal directions, and the width of the joint portion. One support arm body with a dimension less than half of the dimension, a locking rail formed in a horizontal direction near the upper part of the inner surface of the one support arm body, and formed in a horizontal direction at a lower position of the locking rail Moth A plurality of support arms each including a dail and a support roller attached to a lower portion of the front end portion of the inner side surface of the one support arm main body, and the front end portion of the other joint-side floor frame is vertically The rear end portion is attached at a predetermined interval so as to be pivotable in the left-right direction, and the other support arm main body having a dimension less than half the width dimension of the joint portion is located near the upper portion of the inner side surface of the other support arm main body. The locking rail formed in the horizontal direction at the part, the guide rail formed in the horizontal direction at the lower position of the locking rail, and attached to the part near the lower part of the tip of the inner side surface of the other support arm body A plurality of other support arms each comprising a support roller; an engagement piece that engages with the locking rails of the one support arm and the other support arm; and the one support arm and the other support arm. A central support arm main body having an engagement portion that engages with a lower end portion of the arm and having a dimension that is not more than half of the width of the joint, and on the guide rail of the one support arm of the central support arm main body; One support arm support roller mounted on the one support arm side that rolls, and is mounted on the other support arm side that rolls on the guide rail of the other support arm of the central support arm body. And a pair of guide rails formed on both side surfaces of the central support arm body on which the support roller of the one support arm and the support roller of the other support arm roll. A plurality of central support arms, and the plurality of central support arms are positioned at the center of the joint, or the one support arm and the other support arm A floor joint device "(Patent Document 1) characterized by comprising a central support arm holding device that prevents it from falling off is known.

  However, since such a floor joint device uses a large number of joint covers, the slope of the mountain-shaped slope with the top of the center of the joint portion ascending, descending or depending on the thickness of the joint cover has occurred. .

  For example, when such a joint device is used in a hospital, such a slope or a level difference corresponding to the thickness of the joint cover is generated, so that it is necessary for a patient to pass by a wheelchair or while holding a drip stand. It was a burden.

JP2015-098759A

  An object of the present invention is to provide a floor joint device that can flatten the upper surface of a joint cover and absorb the shaking motion in the front-rear direction and the left-right direction due to an earthquake.

The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are for explanation only and do not limit the technical scope of the present invention.

  In order to achieve the above object, a floor joint device of the present invention is a floor joint device provided at a joint portion between left and right housings, and a plurality of support members provided on the left and right housings, A plurality of link mechanisms provided on the left and right housings at predetermined intervals in the front-rear direction; a central joint cover that is attached to a central pivot portion of the link mechanism and covers a central portion of the joint portion; and A pair of left and right end joint covers whose end portions are respectively attached to a pair of end pivot portions or left and right housings, and an intermediate pivot portion between the central pivot portion and the end pivot portion of the link mechanism in the vertical direction. A pair of left and right intermediate joints provided between the center joint cover and the pair of left and right end joint covers, and a contact portion of the center joint cover and the pair of left and right intermediate joint covers and left and right Pair of middle eyes A cover and a pair of end joint covers, respectively, and a bottom surface of a protruding end of the pair of end joint covers, a bottom surface of left and right ends of a pair of left and right intermediate joint covers, and a central joint cover The center joint cover, the end joint cover, the intermediate joint cover, and the support plate are each supported by the support member, and are supported by an earthquake. When the left and right housings swing so that the joint portion becomes narrow, the intermediate joint cover rises upward to absorb the swinging motion.

As is clear from the above description, the present invention has the following effects.
(1) In the first aspect of the invention, the upper surface of the central joint cover, the upper surface of the pair of intermediate joint covers, and the upper surface of the pair of end joint covers are substantially horizontal, so that the upper surface is substantially flat, Even if you are traveling in a wheelchair or you are traveling with a drip stand, you can easily pass.
(2) When the left and right housings are swung so that the joint portion becomes narrow due to the earthquake, the pair of left and right intermediate joint covers rise upward, so that the shaking motion can be absorbed without being damaged.
(3) Since a support plate is provided at the contact portion between the center joint cover and the pair of left and right intermediate joint covers, and the contact portion between the pair of left and right intermediate joint covers and the pair of end joint covers, Even if the vehicle passes, the center joint cover and the pair of end joint covers can be prevented from bending.
(4) In the invention described in claim 2, the same effects as in the above (1) to (3) can be obtained, and provided between the left and right housings and the housing-side end portions of the support plate. The end joint cover can be prevented from being bent by the pair of support mechanisms.
(5) In each of the inventions according to claims 3 to 6, the same effects as in the above (1) to (4) can be obtained.

1 to 11 are explanatory views showing a first embodiment of the present invention.
12 to 14 are explanatory views showing a second embodiment of the present invention.
15 and 16 are explanatory views showing a third embodiment of the present invention.
The top view of the joint device for floors of a 1st embodiment. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. Explanatory drawing of a center joint cover. Explanatory drawing of an end joint cover. Explanatory drawing of an intermediate joint cover. Explanatory drawing of a support plate. Explanatory drawing of a support mechanism. The operation explanatory view of the state where the frame was shaken by the earthquake and the joint part became narrow. The operation explanatory view of the state where the frame was shaken by the earthquake and the joint part became wide. Operation | movement explanatory drawing of the state in which the rod was shaken in the front-back direction which changes with earthquakes. The top view of the joint device for floors of a 2nd embodiment. FIG. 13 is a sectional view taken along line 13-13 of FIG. FIG. 14 is a sectional view taken along line 14-14 of FIG. The top view of the joint device for floors of a 3rd embodiment. FIG. 13 is a sectional view taken along line 13-13 of FIG.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. In this specification, it is referred to as a left-right direction, a front (upward in the drawing), and a rear (downward in the drawing) direction with reference to FIG. Further, it is referred to as an upward (upward drawing) and downward (downward drawing) direction with reference to FIG.
Further, in the present invention, the frame means a building on which joint plates such as buildings, roads, slabs, elevator shafts and the like can be installed. It also includes a passage that can be accessed.
In the first embodiment for carrying out the present invention shown in FIGS. 1 to 11, reference numeral 1 denotes a floor installed between left and right housings 3, 4 provided via a joint portion 2 in the present embodiment. This is a joint device.

  The floor joint device 1 includes a plurality of support members 5 provided between the one housing 3 and the other housing 4 and a plurality of support members 5 provided in the front-rear direction between the one housing 3 and the other housing 4. One end portion of the link mechanism 6, the central joint cover 8 that is attached to the central pivot portion 7 of the link mechanism 6 and covers a part of the joint portion 2, and the pair of end pivot portions 9 of the link mechanism 6. The center joint cover 8 and the left and right side joints 10 are attached to the end joint covers 10 attached to each other and the intermediate pivot 30 between the central pivot 7 and the end pivot 9 of the link mechanism. A pair of left and right intermediate joint covers 31 provided between the pair of end joint covers 10, the contact portion between the central joint cover 8 and the pair of left and right intermediate joint covers 31, and the pair of left and right intermediate joint covers 31 and the pair. Of the end joint cover 10 Provided respectively at the contact portion and supporting the bottom surfaces of the protruding end portions of the pair of end joint covers 10, the bottom surfaces of the left and right end portions of the pair of left and right intermediate joint covers 31, and the bottom surfaces of the left and right end portions of the central joint cover 8. A plurality of support plates 11, the left and right housings 3 and 4, and a pair of support mechanisms 12 provided between the housing-side ends of the support plates.

The plurality of support members 5 include a square pipe-shaped support cylinder 13 and a support arm 14 that is slidably inserted in the square pipe-shaped support cylinder 13 in the left-right direction. The plurality of support members 5 are provided in the front-rear direction so that the upper surfaces of the square pipe-like support cylinders 13 have the same height. It is desirable to provide at least four support members 5, and in the present embodiment, four support members 5 are provided in the front-rear direction of the joint portion 2.
The plurality of support members 5 are attached to the left and right housings 3 and 4 so that the adjacent support members 5 are opposite to each other.

  The support cylinder 13 and the support arm 14 are attached to left and right housings so that attachment end portions 13a and 14a thereof are rotatable in the vertical direction and the front-rear direction.

  Slide rollers 15 are respectively provided on the upper portion of the inner wall surface of the support cylinder 13 on the protruding end portion 13b side and the bottom surface of the protruding end portion 14b of the support arm 14 so that the support arm 14 can slide smoothly.

  The protruding end portion 13b of the support cylinder 13 is formed to have a length of about 2/3 of the joint portion 2 in the present embodiment. The length of the support tube 13 is the opposite side when the left and right housings 3 and 4 are swung so that the joint portion 2 is narrowed due to an earthquake. As long as it does not collide with the housing or the like.

  More preferably, even when the left and right housings 3 and 4 are swung so that the joint portion 2 is widened by an earthquake, the protruding end portion 13b is located on the opposite housing side of the center portion of the joint portion 2 of the joint portion 2. When the left and right housings 3 and 4 are swung so that the joint portion 2 is narrowed by an earthquake, the length is set so as not to collide with the opposite housing or the like.

  By forming in such a length, not only the normal time (the state in which there is no shaking movement of the left and right housings 3 and 4 due to the earthquake) but also how the left and right housings 3 and 4 are shaken by the earthquake will be described later. The central bar member 17 can be supported by the support cylinder 13. In order to make such a length, in the present embodiment, the length of the support tube 13 is formed to be about 2/3 of the joint portion 2.

  In this embodiment, the support member 5 is composed of a support cylinder 13 and a support arm 14, but a square pipe in which projecting end portions 13 b and 14 b are inserted between the support cylinder 13 and the support arm 14. An intermediate cylinder may be provided. Even in this case, the length of the support cylinder 13 is such that the left and right housings 3, 4 protrude so as to protrude toward the opposite housing side from the center portion of the joint portion 2, and the joint portion 2 becomes narrow due to the earthquake. It is desirable that the length is such that it does not collide with the opposite housing or the like when swaying.

The link mechanism 6 uses a pantograph-like link mechanism, and has nine pivotal support portions in the present embodiment. Of these pivotal supports, the pivotal part located substantially in the center is the central pivotal support part 7, the pivotal support parts at the left and right ends are the pair of end pivotal support parts 9, and the pivot located between the central pivotal support part 7 and the end pivotal support part 9. The support portion is a pair of intermediate pivot portions 30, and the pivot portion between the central pivot portion 7 and the intermediate pivot portion 30 and between the intermediate pivot portion 30 and the pair of end pivot portions 9 is a support plate pivot portion 16.
That is, from the end, end pivot 9, support plate pivot 16, intermediate pivot 32, support plate pivot 16, central pivot 7, support plate pivot 16, intermediate pivot 32, support plate The pivot portions are formed in the order of the pivot portion 16 and the end portion pivot portion 9.

A plurality of link mechanisms 6 are provided in the front-rear direction, and in the present embodiment, two link mechanisms 6 are provided in the front-rear direction.
The link mechanism 6 is provided on the left and right housings 3 and 4 so as to be rotatable in the vertical direction and the front-rear direction.

Provided below the central pivot 7 is a central bar member 17 that is pivotally supported by the central pivot 7 and supported by the support cylinder 13 of the support member 5 and extends in the front-rear direction.
As described above, the length of the support cylinder 13 is about 2/3 of the joint portion 2 in the present embodiment, and the plurality of support members 5 are arranged so that the adjacent support members 5 are opposite in the horizontal direction. Therefore, the bottom surface of the center bar member 17 is reliably supported by the plurality of support cylinders 13.

A central joint cover 8 is attached to the central bar member 17 so as to be movable in the vertical direction. That is, the central joint cover 8 is attached to the central pivot 7 of the link mechanism 6 via the central bar member 17 so as to be movable in the vertical direction.
As shown in FIG. 4, the center joint cover 8 is a substantially T-shaped metal plate in a front view in the present embodiment, and the center joint cover 8 is attached to the attachment end portion 8 a (T-shaped lower end portion). 8 is fixed.

  The joint portion 2 is formed to have a dimension that covers approximately ¼ in the left-right direction. A push-up inclined surface 21 is formed at the left and right projecting end portions, and the projecting end portion of the intermediate joint cover 31 is formed. It is in contact with the climbing inclined surface 18.

  The central joint cover 8 is formed with a link mechanism passage hole 19 through which the link mechanism 6 can pass.

  A pair of end portions that are pivotally supported by a pair of end portion pivot support portions 9 below the end portion pivot support portions 9 and supported by the support cylinder 13 of the support member 5 and extend in the front-rear direction. A bar member 20 is provided. A pair of end joint covers 10 are attached to the pair of end bar members 20, respectively.

  That is, the pair of end joint covers 10 are respectively attached to the pair of end pivot portions 9 of the link mechanism 6 via the pair of end bar members 20.

As shown in FIG. 5, the pair of end joint covers 10 are substantially U-shaped (reverse U-shaped) metal plates in front view in the present embodiment. A push-up inclined surface 21 is formed at the protruding end portion of the central joint cover 8, and is in contact with the climbing inclined surface 18 formed at the protruding end portion of the intermediate joint cover 31.
The pair of end joint covers 10 is in a state of covering approximately 1/8 of the joint part 2.
The upper surfaces of the central joint cover 8, the pair of end joint covers 10 and the intermediate joint cover 31 are in a substantially flat horizontal state and close the joint portion 2.

A link mechanism passage hole 19 is also formed in the pair of end joint covers 10.
A plurality of support plate pivots 16 of the link mechanism 6 are provided at a contact portion between the central joint cover 8 and the pair of intermediate joint covers 31 and a contact portion between the pair of end joint covers 10 and the pair of intermediate joint covers 31. And a support plate 11 is provided.

  At the lower part of the support plate pivot portion 16 of the link mechanism 6, the support plate pivot portion 16 is pivotally supported via a pivot pin 16a, and the bottom surface is supported by the support cylinder 13 of the support member 5. A support plate bar member 22 extending in the front-rear direction is provided.

  As shown in FIG. 6, the intermediate joint cover 31 is a substantially T-shaped metal plate when viewed from the front in the present embodiment, and has an intermediate bar member 32 at the attachment end 31 a (T-shaped lower end). A mounting pin 29 is provided to be inserted into the insertion hole 28 formed in the. By inserting the attachment pin 29 to be inserted into the insertion hole 28 of the central joint cover 8 and attaching the intermediate joint cover 31 to the intermediate bar member 32, the intermediate joint cover 31 can be moved in the vertical direction. The depth of the insertion hole 28 and the length of the mounting pin 29 are formed such that the insertion state is not released even when the intermediate joint cover 31 rides on the pair of end joint covers 10 and the central joint cover 8. .

  The intermediate bar member 32 is pivotally supported on the lower side of the intermediate pivot portion 30, and the bottom surface thereof is supported by the support cylinder 13 of the support member 5.

  In the present embodiment, as shown in FIG. 7, the support plate 11 is a metal plate that extends in the front-rear direction with a generally U-shape that opens downward, and a substantially central portion thereof is a pair of support plate bar members 22. Each is pivotally supported via a pivot pin 22a.

Further, support bars 23 are fixed to both end portions (both lower end portions) of the support plate 11, and the bottom surfaces of the support bars 23 are supported by the support cylinder 13 of the support member 5.
The support plate 11 supports the center joint cover 8 and the pair of intermediate joint covers 31 and the bottom surfaces of the ends of the pair of end joint covers 10 and the pair of intermediate joint covers 31 on the upper surface thereof, and in the vicinity of these portions. The center joint cover 8, the pair of end joint covers 10, and the pair of intermediate joint covers 31 are prevented from being bent when a person or the like gets on them.

  As shown in FIG. 7, in the present embodiment, the pair of support mechanisms 12 are attached at one end to the one housing 3 and the other end is one of the support plates 11 on the one housing side. One link member 24 attached to the end on the housing 3 side, and one support roller bar member that is pivotally supported by the central pivot portion 24a of the one link member 24 and has a bottom surface supported by the support member 5 25, one support roller 26 fixed to the one support roller bar member 25, the upper end of which supports the bottom surface of the one end joint cover 10, and one end of the other casing 4 having one end thereof. The other link member 24 is attached to the other housing side end of the other housing side support plate 11, and the other pivot member is pivotally supported by the central pivot portion 24a of the other link member. support The other support roller bar member 25 whose bottom surface is supported by the material 5 and the other support which is fixed to the other support roller bar member 25 and whose upper end supports the bottom surface of the other end joint cover. It is comprised with the roller 26. FIG.

  A plurality of left and right link members 24 are provided in the front-rear direction, one end of which passes through the substantially upstanding side surfaces of the pair of end joint covers 10 and is attached to the left and right housings 3 and 4, respectively.

  Therefore, a link member passage hole 27 is formed in a portion where the link member 24 of the pair of end joint covers 10 is located.

A plurality of left and right support rollers 26 are also provided in the front-rear direction except for the portion where the link member 24 and the link mechanism 6 are located.
One end of each of the link members 24 may be attached to the substantially upright side surface of the end joint cover 10. In this case, the link member passage hole 27 may not be formed in the end joint cover 10.

By the link member 24, the pair of support roller bar members 25 and the support roller 26 are always located between the end of the end joint cover on the housing side and the end of the support plate on the housing side, so that the end joint cover 10 is The bottom surface can be supported so as not to bend.
Both ends of the link member 24 are provided so as to be rotatable in the vertical direction and the front-rear direction.
The support mechanism 12 may also be provided between the center joint cover 8 and the support plate 11 near the center joint cover 8.

When the joint portion 2 becomes narrow due to the earthquake, as shown in FIG. 9, the push-up inclined surface 21 of the center joint cover 8 and the push-up inclined surface 21 of the pair of end joint covers 10 are formed on the pair of intermediate joint covers 31. The ride-up inclined surface 18 is pushed up, and the pair of intermediate joint covers 31 moves upward so as to rise, and absorbs the shaking movement.
When the joint portion 2 returns to a normal size, the pair of intermediate joint covers 31 move downward due to their own weight and return to the normal state.

  When the joint portion 2 becomes wide due to the earthquake, as shown in FIG. 10, the center joint cover 8, the pair of end joint covers 10, and the intermediate joint cover 31 are separated from each other to absorb the shaking motion. At this time, since the support plate 11 is positioned between the central joint cover 8 and the pair of intermediate joint covers 31 and between the pair of intermediate joint covers 31 and the pair of end joint covers 10, the central joint cover 8 and the pair of intermediate joint covers It is possible to prevent a gap from occurring between the joint covers 31 and between the pair of intermediate joint covers 31 and the pair of end joint covers 10.

  When the left and right housings 3 and 4 are swung in different front and rear directions due to the earthquake, as shown in FIG. 11, the support member 5, the link mechanism 6 and the link member 24 are rotated in the front and rear directions to absorb the wobbling motion. .

  Although not shown, the support member 5, the link mechanism 6, and the link member 24 are provided so as to be pivotable in the vertical direction, so that even if any of the left and right housings 3, 4 is not settled, it is not damaged. Can follow.

[Different forms for carrying out the invention]
Next, different modes for carrying out the present invention shown in FIGS. 12 to 16 will be described. In the description of the different embodiments for carrying out the present invention, the same components as those in the first embodiment for carrying out the present invention are denoted by the same reference numerals, and redundant description is omitted.
The second embodiment for carrying out the present invention shown in FIGS. 12 to 14 is mainly different from the first embodiment for carrying out the present invention in that the central bar member is located above the link mechanism 6. 17, the end bar member 20, the support plate bar member 22, and the support bar 23 are provided so as to be located, and the central joint cover 8A and the end joint cover 10A having no link mechanism passage hole 19 or link member passage hole 27 are provided. The support plate 11A and the intermediate joint cover 31A are used, and the pair of support mechanisms are not used. Even in such a joint device 1A, the same effects as the first embodiment for carrying out the present invention are provided. Can be obtained.
In the present embodiment, the link member 24 is provided between the inner side surface of the end joint cover 10A and the side surface of the support plate 11A.

  The third embodiment for carrying out the present invention shown in FIGS. 15 and 16 is mainly different from the second embodiment for carrying out the present invention in that a pair of ends are provided on the left and right housings 3 and 4 respectively. Even in such a joint device 1B, the same effect as that of the first embodiment for carrying out the present invention can be obtained in that the joint joint cover 10B is fixed via a substantially hemispherical packing 33. it can.

  The present invention is used in the industry for manufacturing joint devices.

1, 1A, 1B: floor joint device, 2: joint portion,
3: one housing, 4: the other housing,
5: Support member, 6: Link mechanism,
7: Central pivot, 8, 8A: Central joint cover,
9: End pivot
10, 10A, 10B: End joint cover,
11, 11A: support plate, 12: support mechanism,
13: support cylinder, 14: support arm,
15: slide roller, 16: pivot for support plate,
17: Central bar member, 18: Riding slope,
19: Link mechanism passage hole, 20: End bar member,
21: Push-up inclined surface, 22: Bar member for support plate,
23: Support bar, 24: Link member,
25: Bar member for support roller, 26: Support roller,
27: Link member passage hole, 28: Insertion hole,
29: Mounting pin, 30: Intermediate pivot,
31: Intermediate joint cover, 32: Intermediate bar member.

Claims (6)

A floor joint device provided at a joint between the left and right housings, and a plurality of support members provided on the left and right housings and a plurality of support members provided at predetermined intervals in the front-rear direction. A link mechanism, a central joint cover that is attached to the central pivot portion of the link mechanism and covers the central portion of the joint portion, and a pair of end pivot portions of the link mechanism or one end portion of each of the left and right housings. A pair of left and right end joint covers, and a middle pivot support intermediate between the central pivot of the link mechanism and the end pivot support, and the central joint cover and the pair of left and right ends. A pair of left and right intermediate joint covers provided between the joint covers, a contact portion between the central joint cover and the pair of left and right intermediate joint covers, and a contact portion between the pair of left and right intermediate joint covers and the pair of end joint covers. To it A plurality of support plates that support the bottom surfaces of the left and right end portions of the pair of left and right intermediate joint covers and the bottom surfaces of the left and right end portions of the central joint cover. The center joint cover, the end joint cover, the intermediate joint cover, and the support plate are each supported by the support member, and when the left and right housings are swung so that the joint portion is narrowed by an earthquake. The floor joint device is characterized in that the intermediate joint cover rises upward to absorb the shaking motion. The pair of support mechanisms that respectively support the bottom surfaces of the pair of end joint covers are further provided between the left and right housings and the housing-side ends of the support plate. Floor jointing equipment. The pair of support mechanisms includes one link member having one end attached to the one housing or the end joint cover and the other end attached to one housing side end of the support plate; One support roller bar member that is pivotally supported by the central pivot portion of one link member and whose bottom surface is supported by the support member, and fixed to the one support roller bar member. One support roller that supports the bottom surface of one end joint cover of the end joint cover, and one end of the other roller or the end joint cover is attached to the other end, and the other end is the other casing of the support plate. The other link member attached to the end on the side, the other support roller bar member pivotally supported by the central pivot portion of the other link member and supported on the bottom surface by the support member, and the other support member. Is fixed to the bar member roller floor as claimed in claim 2, characterized in that it consists of the other support roller to which the upper end for supporting the other end bottom of the joint cover of the pair of end joint cover Joint equipment. A central bar member that is pivotally supported by the central pivot portion of the link mechanism, and a bottom surface is supported by the support member, and is pivotally supported by the intermediate pivot portion of the link mechanism, and the bottom surface is supported by the support member. A pair of intermediate bar members and a pair of end bar members that are pivotally supported by the end pivotal support portions of the link mechanism and whose bottom surfaces are supported by the support members. The pair of intermediate joint covers are attached to the pair of intermediate bar members so as to be vertically movable, and the pair of end joint covers are respectively attached to the pair of end bar members. The floor joint device according to any one of claims 1 to 3 , wherein A plurality of support plate bar members that are pivotally supported by a support plate pivot between the central pivot and the intermediate pivot and between the intermediate pivot and the end pivot, and the bottom surface is supported by the support member. 2. The plurality of support plates, wherein a center portion of each of the plurality of support plate bar members is pivotally supported, and both end portions thereof are supported by the support member. The floor joint device according to claim 4 . The support member includes a square pipe-shaped support cylinder and a support arm inserted into the square pipe-shaped support cylinder so as to be slidable in the left-right direction. The joint device according to any one of claims 1 to 5, wherein the joint device is attached so as to face.

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