JP4865501B2 - Top plate connection structure - Google Patents

Description

  The present invention relates to a connection structure that connects top plates such as tables and desks arranged adjacent to each other.

As a connection structure of the top plates as described above, for example, there are those described in Patent Documents 1 to 4.
JP 2001-120377 A JP-A-7-255550 JP-A-11-46907 JP 2001-128767 A

  In the top plate connection structure described in Patent Document 1, a connection member is attached to the top plate receiving portion at the upper end of the desk legs adjacent to each other, and the two connection members are screwed together from below with a connection bracket. Since the top plates of both desks are indirectly connected to each other, a gap is formed between the opposing surfaces of the top plates when a dimensional error occurs in the top plate, which makes the appearance worse. May be.

On the other hand, since the connection structure of the top plates described in Patent Documents 2 to 4 is connected by the connecting means while pulling the end portions of the top plates together, between the opposing surfaces of both top plates. There is little risk of gaps being formed.
However, in the ones described in Patent Documents 2 and 3, the crosspieces facing in the front-rear direction are fitted to the lower surfaces of the side end portions of the two top plates, and in the one described in Patent Document 4, the opposite surfaces of the two top plates are fitted to each other. Since the plurality of edge members having the concave portions and the convex portions to be joined are fixed to each other, the manufacturing cost of the top plate increases, and there is a problem that it cannot be shared with a general desk top plate.

  In addition, the ones described in Patent Documents 2 and 3 do not connect both top plates while directly pulling them, but screw the crosspieces fixed to the lower surface of the top plate, that is, the lower surface of the top plate, with screws. Alternatively, since the screws are connected by the connecting metal fittings, the screw tightening force does not effectively act on the facing surface of the top plate. Therefore, for example, if the top plate is formed of a sheet metal and the side end surface is inclined outwardly due to manufacturing errors or the like, a gap may be formed between the opposing surfaces of the upper end portion of the top plate.

  Furthermore, since the thing of patent document 2 and 3 is attaching the connection means which connects both top plates, and the height adjustment means for aligning the upper surfaces of top plates mutually, there are many number of parts, In addition to the high cost, there is a problem that both means are exposed and the appearance is poor.

  The present invention has been made in view of the above problems, and it is not necessary to attach any other connecting member to the top plate, and both the top plates can be easily assembled even if the top plate is made of sheet metal. It is an object of the present invention to provide a top plate connection structure in which the upper surfaces are aligned by such means and can be firmly connected without a gap.

According to the present invention, the above problem is solved as follows.
(1) In the connection structure that connects the side ends of the top plates adjacent to each other on the left and right, the opposing end portions of the top plates are placed on a top plate support rod that faces the front-rear direction of the upper end of the pedestal, Upper ends of a pair of left and right connecting members disposed on both sides of the top plate support rod on the outer surface of the hanging portion provided on the lower surface of the opposite end portions of the left and right top plates on the opposite side to the opposing surfaces of the top plates The two top members are attracted to each other and connected to each other by attracting them in a direction approaching each other toward the both side surfaces of the top plate support rod with the attraction means. The connecting position can be adjusted in the left-right direction, and the top plate support rod is also connected.

(2) In the above item (1), the pair of left and right connecting members are formed in a substantially inverted C shape when viewed from the front on the side of the top plate support rod, and the lower ends are in contact with both side surfaces of the top plate support rod. It has a base piece and an attracting piece that is connected to the upper end of the base piece and is bent inward so that the tip abuts against the outer surface of the hanging part. Install the attracting means.

(3) In the above item (2), the tip of the attracting piece is brought into contact with the upper end of the outer surface of each hanging part.

(4) In any one of the above items (1) to (3), the attracting means includes a bolt that penetrates the top plate support rod and a nut that is screwed to the bolt.

(5) In the above item (4), the outer surfaces of both connecting members with which the bolts and nuts abut are arcuate curved surfaces that bulge outward.

(6) In any one of the above items (1) to (5), the engagement hole is formed in one of the opposing surfaces of the lower end portions of the two connecting members and the side surface of the top plate support rod, and the other is engaged. Locking protrusions that are fitted into the holes are respectively provided so that both connecting members can rotate in the left-right direction with the fitting portion between the engagement hole and the locking protrusion as a fulcrum.

(7) In the item (2) or any one of the items (4) to (6) subordinate to the item (2), the leading ends of the attracting pieces of both connecting members are extended obliquely inwardly downward, and the tips are It is made to contact | abut to the corner | angular part of the lower end in the front view outward U-shaped part formed in the opposing edge part of a right-and-left top plate.

(8) In any one of the above items (1) to (7), the top plate support rod is provided with a long hole that faces in the vertical direction and is long in the left and right direction, and the bolt inserted from below the long hole is Both top plates are fixed to the top plate support rods by being screwed into screws to be provided at opposite ends of the top plate.

According to the first aspect of the present invention, the upper end portions of the pair of left and right connecting members are brought into contact with the outer surfaces of the hanging portions provided on the lower surfaces of the opposite end portions of the top plates, and the connecting members are attracted to each other. By simply pulling in the direction approaching each other, the top plates can be connected to the top plate support rod while being firmly connected to each other while pulling each other. Accordingly, there is no need to attach any separate connecting members to the side edges of the left and right top plates or the top plate support rod, and the top plate or the top plate support rod can be manufactured at low cost, and other general ceiling plates can be manufactured. It can be shared with a plate or top plate support rod.
In addition, the left and right top plates are connected to the top plate support rod so that the connection position can be adjusted in the left-right direction, so that, for example, an error occurs in the left-right dimensions of both top plates, and the connection positions are shifted to the left and right. However, it can be connected to the top plate support rod while pulling both top plates.
Further, the opposing end portions of the left and right top plates are supported by the top plate support rods, and are connected to each other in this state, so that the top surfaces of both top plates are aligned and will not be displaced vertically.

According to the second aspect of the present invention, the two connecting members are brought into contact with both side surfaces of the top plate support rod by attracting the base pieces of the two connecting members, each having a reverse C shape when viewed from the front, by the attracting means. Thus, the side ends of the left and right top plates can be effectively pulled inward in the horizontal direction by the left and right inward attracting pieces. Therefore, both top plates can be more firmly connected without a gap.
In addition, since both the connecting members can rotate independently in the left-right direction with the lower ends of the base pieces in contact with both side surfaces of the top-plate support rod as fulcrums, the connecting position of both top-plates is greatly increased in the left-right direction. Even if they are misaligned, they can be connected to the top plate support rod without any trouble while pulling both top plates.
Furthermore, since the base pieces of both connecting members are located on the side of the top plate support rod and the attracting means are attached to the base pieces, the operability of the attracting means is improved.

  According to the invention of claim 3, since the opposing ends of the attracting pieces of both connecting members are brought into contact with the upper ends of the hanging portions of the left and right top plates, the hanging portion of the top plate formed by sheet metal or the like, Even if it is inclined outwardly due to a manufacturing error or the like, there is no fear that a gap is formed on the opposing surfaces of the upper ends of the hanging parts, and the appearance is improved.

According to the invention described in claim 4, both the connecting members can be firmly attracted by the bolts and nuts, and the bolts for fixing both the connecting members penetrate the top plate support rods. There is no fear that the connecting part will be lifted from the upper surface of the top plate support bowl.
In addition, the left and right connecting members are supported by bolts penetrating the top plate support rod, and can be tightened while preventing them from dropping downward, so that workability is improved.

  According to the fifth aspect of the present invention, even if the connecting position of the top plate is shifted in the left-right direction, both connecting members, bolts and nuts are in line contact with each other, so that both connecting members are attracted uniformly in a substantially horizontal direction. be able to.

  According to the sixth aspect of the present invention, the right and left connecting members are stably rotated independently in the left-right direction with the fitting portion between the engagement hole and the locking projection as a fulcrum without being displaced in the vertical direction. Since it can move, even if the connection position of both top boards shifts | deviates to the left-right direction, both top boards can be firmly connected without trouble.

  According to the seventh aspect of the present invention, when the two connecting members are attracted, the left and right top plates are attracted and connected so as to be pressed against the top plate support rods, so that the side ends of both top plates are attached to the top plate. It is fixed to the plate support rod and prevented from floating.

  According to invention of Claim 8, even if the connection position of a top plate shifts | deviates to the left-right direction, the side edge parts of both top plates can be firmly fixed and connected with a top plate support rod with a volt | bolt. it can.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a table formed by applying the first embodiment of the present invention, and FIG. 2 is an enlarged vertical side view taken along line II-II in FIG. The table 1 is attached to a pair of left and right plate-shaped side legs 2 and 2, an intermediate leg 3 disposed in the center between the both side legs 2, and the upper surfaces of the left and right side legs 2 and the intermediate leg 3. There are four top plates 4 arranged in the front-rear and left-right directions (hereinafter described with the diagonally right front in FIG. 1 as the front).

A gap 5 for wiring insertion is formed between the opposing surfaces of the top plates 4, 4 arranged in the front-rear direction so as to be continuous in the left-right direction, and a cover 6 is detachably fitted into the gap 5. Yes.
The intermediate leg 3 is a rectangular tube-shaped leg column 3a having a pair of front and rear adjusters 7 and 7 attached to the lower surface thereof, and a rectangular tube shape having a central lower surface fixed to the upper end of the leg column 3a. And has a T-shape when viewed from the side. Caps 8 are fitted on the front and rear opening ends of the top plate support rod 3b.

  Each top plate 4 is formed between a top plate 9 made of sheet metal and a back plate 10 by spot welding a plurality of front and rear reinforcing members 11 having a reverse hat-shaped cross section facing in the left-right direction. The inner ends of the bent pieces 9a and 9b that are generally inwardly U-shaped in a side view and are connected to the front and rear ends of the upper surface plate 9 are the front and rear ends of the back plate 10, respectively. The upright pieces 10a are sandwiched and spot welded.

  As shown in FIG. 4, between the top plate 9 and the back plate 10 at the side end of each top plate 4, a substantially upward U-shaped reinforcing member 12 is spot welded. The inner end of the hanging piece 9c, which is bent in the downward direction at the side edge of the upper surface plate 9 and has an L shape inward in front view, sandwiches the standing piece 10b at the side edge of the back plate 10, Welded. In addition, the top plate 4 having such a structure is of general versatility.

  Opposing end portions of the top plates 4 arranged on the left and right are connected to each other by the connecting structure of the first embodiment described in detail below and fixed to the intermediate leg 3. In addition, since the connection structure of the left and right top plates 4 in the front part and the rear part and the fixing structure to the intermediate leg 3 are symmetrical and the same structure, the following description will be made only on the front side and on the rear side. Description of is omitted.

  As shown in FIGS. 2 to 4, a pair of left and right connecting members 13, 13 are attached to the left and right side surfaces of the front and rear portions of the top plate support rod 3 b positioned in front of the pillar 3 a in the intermediate leg 3. For this purpose, circular holes 14 and 14 and rectangular engagement holes 15 and 15 are formed so as to face the left and right sides and to be lined up and down.

  Further, as shown in FIG. 5, a pair of left and right sides for attaching spacers 16 is provided on both upper and lower surfaces of the front and rear portions of the top plate support rod 3b slightly outside the front and rear circular holes 14 and the engagement holes 15. Bolt insertion holes 17 and 17 are formed so as to face each other vertically, and rectangular positioning holes 18 and 18 for positioning the spacer 16 are formed on the upper surface sandwiching the left and right bolt insertion holes 17. ing.

The left and right connecting members 13, 13 are each composed of a thick base piece 13 a that faces in the vertical direction, and an attracting piece 13 b that is connected to the upper end of the thick base piece 13 a and has a bull horn-shaped cross section that is substantially inwardly horizontal. However, they are integrally formed symmetrically with each other so as to form a substantially inverted L shape when viewed from the front using a metal or an aluminum alloy. Stepped holes 19, 19 facing in the left-right direction in which a head portion and a shaft portion of a bolt 24 and a nut 25 to be described later are fitted with a margin are provided in the middle portion in the vertical direction of the base piece 13 a in both the connecting members 13. It is formed symmetrically. The step surface 19a at the back of the stepped hole 19 is an arcuate curved surface that bulges outward.
A locking projection 20 that can be fitted into the engagement hole 15 of the top plate support rod 3b is formed on the inner surface of the lower end of both base pieces 13a.

  The spacer 16 is formed of a synthetic resin or the like in a substantially rectangular cross section having a size that can be fitted into the top plate support rod 3b, and has a short dimension that can be fitted into the positioning hole 18 from below at the center of the upper surface. An upward protrusion 21 is provided. When the two spacers 16 are pushed into the top plate support rod 3b until the respective upward projections 21 are fitted in the positioning holes 18, a pair of left and right directions facing the vertical direction provided in each spacer 16 is provided. The long stepped long holes 22 and 22 and the left and right bolt insertion holes 17 and 17 of the top plate support rod 3b are aligned with each other.

  Connection between the opposite ends of the left and right top plates 4 and attachment to the top plate support rod 3b are performed as follows. In addition, since connection and attachment of the front part and the rear part of the top plate 4 are performed in the same manner, only the front side will be described.

  As shown in FIG. 4, after the opposing end portions of the top plates 4 are placed on the top support rod 3 b, the attracting pieces 13 b in the pair of left and right connecting members 13 are connected to the opposing end portions in the left and right top plates 4. The back plate 10 and the bottom surface of the reinforcing member 12 are inserted into the internal space of the side end portions of the top plates 4 through the through holes 23 formed in the bottom plate 10.

  Next, after engaging the locking protrusions 20 of the base pieces 13a of the connecting members 13 with the engaging holes 15 on both side surfaces of the top plate support rod 3b, either one of the base pieces 13a (in the embodiment) From the stepped hole 19 on the right side, a long bolt 24 having a head portion 24a with a hexagonal hole is passed through the left and right circular holes 14 of the top plate support rod 3b, and the male threaded portion 24b at the tip is Insert into the other (left) stepped hole 19.

  Next, in the other stepped hole 19, a nut 25 is screwed into the male threaded portion 24 b, and the tips of the attracting pieces 13 b of both connecting members 13 are both top plates of the hanging pieces 12 a of the left and right reinforcing members 12 facing each other. 4 is temporarily tightened until it comes into contact with the outer surface opposite to the opposite surface. At this time, a clearance S corresponding to the tightening allowance is formed between the opposing surfaces of the base piece 13a of both connecting members 13 and the both side end surfaces of the top plate support rod 3b. The left and right dimensions of the top plate support rod 3b and the fixing position of the reinforcing member 12 are appropriately determined so that the lower end portions have a reverse C shape when viewed from the front.

  When the nut 25 is strongly tightened in the above state, the left and right connecting members 13 are turned inward in the directions approaching each other with the locking projection 20 as a fulcrum, and a large rotational moment is applied to the upper end portion. Thus, the opposing ends of the attracting pieces 13b strongly press the upper end portions of the outer surfaces of the drooping pieces 12a facing each other in the left and right reinforcing members 12.

  Thereby, the opposing end portions of the top plates 4 are directly drawn by the left and right connecting members 13, and the top plates 4 are firmly connected with the side end surfaces facing each other in close contact. In addition, the leading ends of the attracting pieces 13b of the connecting members 13 are in contact with the upper end portions of the drooping pieces 12a so as to attract the portions strongly. Even if they are inclined outwardly due to manufacturing errors during work, no gap is formed between the opposing surfaces at their upper ends.

  After connecting the left and right top plates 4 in this way, as shown in FIG. 5, in the stepped long holes 22 and 22 of the front and rear spacers 16 inserted and positioned in advance in the top plate support rod 3b. The bolts 26 are inserted through the bolt insertion holes 17 on the lower surface of the top plate support rod 3b, and the bolts 26 are pre-welded to the upper surfaces of the left and right reinforcing members 12 before being spot welded to the top plate 4. Tighten to 27. As a result, the opposite end portions of the left and right top plates 4 are fixed to the top surface of the top plate support rod 3b with their top surfaces aligned with each other.

  Since the left and right connecting members 13 are independently rotated in the left-right direction around the locking projection 20 at the lower end of the base piece 13a, as shown in FIG. Even if an error occurs and the butted surfaces C of the top plates 4 are slightly shifted to the left (or right) from the center O of the top plate support rod 3b, they can be drawn and connected without any trouble.

At this time, the stepped surface 19a of the stepped hole 19 formed in both the connecting members 13 is an arcuate curved surface that bulges outward, and even if both the connecting members 13 rotate asymmetrically, the bolts Since the head portion 24a of 24 and the inner end face of the nut 25 are always in line contact with the stepped surface 19a, both connecting members 13 are attracted uniformly and firmly in a substantially horizontal direction.
As described above, even if the butted surfaces C of the top plates 4 are slightly displaced in the left-right direction, the stepped long hole 22 for inserting the bolt 26 formed in the spacer 16 is elongated in the left-right direction. Therefore, both the top plates 4 can be fixed to the top plate support rod 3b without hindrance.

  Further, as shown in FIG. 7, for example, when the top plates 4 having different left and right dimensions are connected to each other, the butting surface C of both the top plates 4 is left (or right) from the center O of the top plate support rod 3 b. Even when the position is greatly displaced, the left and right connecting members 13 are independently rotated in the left-right direction and the stepped surface 19a of the stepped hole 19 has an arcuate curved surface. The top plates 4 can be firmly connected to each other without any trouble.

  FIG. 8 shows the connecting structure of the second embodiment. The left and right connecting members 28, 28 are formed by a base piece 28a having a substantially square cross section when viewed from the front, and an inwardly inverted L-shape continuously provided at the upper end thereof. The bolt 30 inserted through one of the left and right shaft holes 29 formed in the attracting pieces 28b is inserted through the circular hole 14 of the top plate support rod 3b. Then, by inserting the other shaft hole 29 and tightening the nut 31 screwed into the male screw portion 30a of the projecting end portion, both the connecting members 28 are moved in a direction approaching each other in parallel with the top plate 4. It is a thing.

  The front ends of the left and right attracting pieces 28b are in contact with the upper ends of the outer surfaces of the hanging pieces 32a of the reinforcing members 32 and 32 spot-welded between the top plate 9 and the back plate 10 of the left and right top plates 4 in the same manner as described above. I'm allowed. Also in such a connection structure, the nut 31 is tightened and both the connection members 28 are moved in parallel in a direction approaching each other, so that the opposing portions of the left and right top plates 4 are directly drawn to connect firmly and without a gap. can do. Note that the top plate support rod 3b of the intermediate leg 3 can be omitted when the top plates 4 having relatively small left and right dimensions are connected to each other by the connecting structure of the second embodiment.

  FIG. 9 shows the connecting structure of the third embodiment. The left and right connecting members 33, 33 are made of thick metal flat plates, and the upper ends of both connecting members 33 are made of, for example, wood or synthetic resin. The left and right top plates 4 are in contact with the outer surfaces of the inner hanging portions 34a of the recesses 34, 34 provided on the lower surface of the outer side of the top plate support rod 3b. The opposing surfaces are brought into contact with the lower ends of both side surfaces of the top plate support rod 3b, so that both connecting members 33 have a reverse C shape when viewed from the front, and through-holes 35 are formed in the middle portion thereof. , 35 and the male threaded portion 24b of the bolt 24 inserted through the circular hole 14 of the top plate support rod 3b, and the nut 25 is screwed and tightened so that both connecting members 33 are strongly pressed inward from each other with the lower end as a fulcrum. It is a thing.

The outer surface 33a where the head portion 24a of the bolt 24 and the nut 25 abut on each of the connecting members 33 is an arcuate curved surface bulging outward so as to be in line contact with each other.
Also in the connection structure of the third embodiment, the opposing end portions of the left and right top plates 4 such as wooden plates placed on the top plate support rod 3b are pulled firmly to each other without being displaced vertically. And can be connected without a gap. Although not shown, both the top plate 4 and the top plate support rod 3b are screwed in order to provide the upper end of the bolt 26 inserted into the spacer 16 on the lower surface of the top plate 4 as shown in FIG. It is fixed by screwing into the hole.

  As described above, in any of the top plate connection structures of the above embodiment, the top plate 4 is simply drilled in the lower surface of the side end portion of the general-purpose top plate 4 without attaching any other connecting member. The upper ends of the attracting pieces 13b and 28b at the upper end of the pair of left and right connecting members 13 and 28 or the upper end of the connecting member 33 itself are inserted into the through hole 23 and the recessed portion 34, and both the connecting members 13 and 28 are located below the top plate 4. By simply pulling them together with the bolts 24 and the nuts 25, the top plates 4 can be pulled together, and can be firmly connected without any gaps and with the top surfaces aligned.

The present invention is not limited to the above embodiment.
For example, as in the fourth embodiment shown in FIG. 10, the attracting pieces 13 b in the left and right connecting members 13 shown in FIG. 4 are curved in a downwardly arcuate shape when viewed from the front, and their tips are mutually connected to the left and right reinforcing members 12. You may make it contact | abut from the diagonally upper part to the inner corner part of the lower end of the opposing U-shaped part, and may make the opposing edge part of both the top plates 4 press diagonally inward downward. In this way, the left and right top plates 4 are attracted so as to be pressed against the top surface of the top plate support rod 3b and connected to each other, so that the spacers for fixing both the top plates 4 to the top plate support rod 13b. 16, bolt 26, nut 27, etc. can be omitted.

  In the connection structure of the sheet metal top plate 4, the reinforcing members 12 and 32 fixed to the side ends of the left and right top plates 4 are pressed by the attracting pieces 13 b and 28 b of the connection members 13 and 28. However, in the top plate that does not have the reinforcing members 12 and 32, the hanging pieces 9c on the opposing surfaces of the top plates 4 may be directly pressed to draw each other.

It is a perspective view of the table formed by applying the 1st Embodiment of this invention. Similarly, it is the II-II line expansion vertical side view of FIG. Similarly, it is a perspective view of the principal part by the side of the front part of an intermediate leg. It is the IV-IV line enlarged vertical front view of FIG. Similarly, it is a VV line expansion vertical front view. It is an enlarged vertical front view which shows a connection state when the butt | matching surface of a right-and-left top plate has shifted | deviated slightly to the side. It is an enlarged vertical front view which shows a connection state when the left-right dimension of a left-right top plate differs. It is an enlarged vertical front view which shows the connection structure of the 2nd Embodiment of this invention, and the connection state of top plates by it. It is the expansion vertical front view which shows the connection structure of the 3rd Embodiment of this invention, and the connection state of top plates by it. It is an enlarged vertical front view which shows the connection structure of the 4th Embodiment of this invention, and the connection state of top plates by it.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Table 2 Side leg 3 Intermediate leg 3a Leg column 3b Top plate support rod 4 Top plate 5 Gap 6 Cover 7 Adjuster 8 Cap 9 Top plate 9a Bending piece 9b Bending piece 9c
DESCRIPTION OF SYMBOLS 10 Back plate 10a Standing piece 10b Standing piece 11 Reinforcement member 12 Reinforcement member 12a Hanging piece (hanging part)
DESCRIPTION OF SYMBOLS 13 Connecting member 13a Base piece 13b Attracting piece 14 Circular hole 15 Engagement hole 16 Spacer 17 Bolt insertion hole 18 Positioning hole 19 Stepped hole 19a Stepped surface 20 Locking protrusion 21 Upward protruding part 22 Stepped long hole 23 Through hole 24 Bolt 24a Head 24b Male thread part 25 Nut 26 Bolt 27 Nut 28 Connecting member 28a Base piece 28b Attracting piece 29 Shaft hole 30 Bolt 30a Male thread part 31 Nut 32 Reinforcing member 32a Hanging piece (hanging part)
33 connecting member 33a outer side surface 34a hanging part 34 recessed part 35 through hole

Claims (8)

  In the connecting structure for connecting the side edges of the left and right top plates, the opposite ends of the top plates are placed on a top plate support rod facing the front-rear direction of the upper end of the pedestal, and the left and right top plates are mounted. The upper ends of a pair of left and right connecting members arranged on both sides of the top plate support rod are brought into contact with the outer surface of the hanging portion provided on the lower surface of the opposite end portion of the plate on the opposite side of the opposite surfaces of the top plates. And pulling the connecting members together in a direction approaching each other toward the both side surfaces of the top plate support rod by means of attraction, and connecting the top and bottom plates to each other. A top plate connection structure characterized in that it can be adjusted in the left-right direction and is also connected to the top plate support rod.   A base piece in which a pair of left and right connecting members are formed in a substantially inverted H shape when viewed from the side on the side of the top plate support rod, and the lower end portions are in contact with both side surfaces of the top plate support rod, and the base piece 2. An attracting piece that is connected to the upper end of the first and bent inward so that a tip abuts against an outer surface of the hanging portion, and attracting means is attached to both base pieces. Connecting structure of the top board.   The top plate connection structure according to claim 2, wherein the tip of the attracting piece is brought into contact with the upper end of the outer surface of each hanging part.   The top plate connection structure according to any one of claims 1 to 3, wherein the attracting means includes a bolt penetrating the top plate support rod and a nut screwed into the bolt.   The top plate connection structure according to claim 4, wherein the outer side surfaces of both connection members with which the bolt and the nut abut are formed as arcuate curved surfaces bulging outward.   An engaging hole is provided on either one of the opposing surfaces of the lower end portions of the two connecting members and the side surface of the top plate support rod, and a locking protrusion is provided on the other side to fit the engaging hole, The top plate connection structure according to any one of claims 1 to 5, wherein the top plate can be rotated in the left-right direction with a fitting portion between the engagement hole and the locking projection as a fulcrum.   The front ends of the attracting pieces of both connecting members extend obliquely inwardly downward, and the front ends thereof are corners at the lower ends in the outward U-shaped portions formed on the opposite ends of the left and right top plates. The top plate connection structure according to claim 2, wherein the top plate is in contact with the top plate, or claim 4 dependent on claim 2. By providing a long slot in the top and bottom plate that faces in the vertical direction and long in the left and right direction, and bolts inserted from below the long holes are screwed into screws to be provided at the opposite ends of the left and right top boards. The top plate connection structure according to claim 1, wherein the top plates are fixed to a top plate support rod.

Images