JPH0750488Y2 - Connecting device between supporting rod and horizontal rod in partition panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a connecting device between a supporting rod and a horizontal rod in a partition panel.

[Conventional technology]

Conventionally, various connecting devices for connecting the support rod and the horizontal rod of a partition panel in which a panel plate is mounted in a frame body formed by support rods on both sides and upper and lower horizontal rods have been provided, but most of them are support rods. A structure in which a substantially L-shaped connecting metal fitting is laterally protruded and fixed to the upper and lower end side surfaces by means of screws or the like, and the side end portions of the lateral rods are brought into contact with the connecting metal fittings to be screwed, or the upper and lower ends of the supporting rod. A pipe-shaped connecting pipe is fixed to the structure, and the connecting pipe is inserted into the end of the horizontal rod to fasten it with screws, or a corner metal fitting with a substantially triangular shape in front view is screwed to the corners of the supporting rod and the horizontal rod. It has a structure to connect, there is a problem that the connecting metal fittings are exposed to the outside and the appearance is impaired, and the screw loosens after the connection and rattling occurs. The size and shape of the frame that supports the panel board is determined, such as the height position of the panel is limited. Which it was, but the location for installing the partition panel, or if you want to properly change the dimensions of the frame when moving recombinantly many, the appearance of such a flexible coupling device has been desired.

[Problems to be solved by the device]

In view of the above-mentioned situation, the present invention is to solve the problem that the assembling and disassembling work is extremely easy and can be firmly tightened and connected, and it does not loosen and rattle even when it is used for a long period of time. It is an object of the present invention to provide a connecting device of a supporting rod and a horizontal rod in a partition panel in which the mounting height to the panel can be changed appropriately and the connecting tool is not exposed to the outside.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention is a partition panel in which a panel plate is mounted in a frame body formed by supporting rods on both sides and upper and lower horizontal rods, and is formed into a hollow rod shape and has an opening on the inner length. A groove is formed with the width of the edge narrower than the inside, and a partition wall serving as the bottom surface of the groove is formed inside over the entire length, and an engaging hole is formed in the partition wall at a position closer to the center by a predetermined distance from the upper and lower ends. And at least both ends thereof are formed with substantially square holes that open laterally, and screw holes that penetrate into the holes are formed at a position closer to the center in the longitudinal direction by a predetermined distance from both outer ends. The formed horizontal rod, the vertical portion having a trapezoidal plan view shape that can be inserted into the groove of the support rod from above and below and the horizontal portion that can be inserted into the hole of the horizontal rod are substantially L
In addition to being formed in a V shape, a screw hole that penetrates from the upper bottom to the lower bottom of the vertical portion is screwed with a screw capable of press-engaging the tip into an engagement hole formed in the partition wall, and further the outer surface of the horizontal portion. A support rod and a horizontal rod connecting device in a partition panel, which comprises a connecting member formed on the tip end side of the notch formed on the side surface of the horizontal rod to press and abut the tip of the screw screwed into the screw hole of the horizontal rod. Configured.

Further, the tip of the screw screwed into the screw hole of the connecting tool is tapered, and the inner diameter of the engaging hole of the supporting rod is set smaller than the outer diameter of the screw.

The tip end of the screw shaft screwed into the screw hole of the horizontal rod is formed in a taper shape corresponding to the inclined surface of the connecting tool.

[Action]

According to the above-mentioned contents, the device for connecting the supporting rod and the horizontal rod in the partition panel of the present invention is provided with a vertical groove of the connecting device from above in a recessed groove in which the width of the opening edge is set to be smaller than the inner length of the supporting rod. By inserting the screw into the screw hole that is formed through the vertical portion and pressing the partition wall inside the support rod with the tip of the screw hole, the fitting state is further strengthened and the vertical displacement is regulated. Then, while further inserting the horizontal portion of the connecting tool from the side into substantially square holes that are opened laterally at both ends of the horizontal rod,
By pressing and abutting the tip of the screw screwed into the screw hole formed on the outer surface of the horizontal rod to the inclined surface formed on the tip end side of the cutout portion of the horizontal portion, the horizontal portion can be inserted more in the direction of insertion. It is tightened.

In addition, the positioning and the vertical displacement are surely regulated by pressingly engaging the tip of the screw threaded to the vertical portion of the connecting tool with the engaging hole formed in the partition wall of the supporting rod.

Further, by forming the vertical portion into a substantially trapezoidal shape in a plan view, the partition wall is pressed by the screw screwed into the screw hole formed in the vertical portion, and the slope of the trapezoid is narrower than the inside of the concave groove. It is pressed against the inside of the opening edge to further strengthen the fitting.

Furthermore, by forming the tip of the screw that is screwed into the vertical portion into a taper shape and making the inner diameter of the engaging hole smaller than the outer diameter of the screw, it is possible to realize a pressing engagement state without rattling.

And, by forming the tip of the screw to be screwed into the screw hole of the horizontal rod in a tapered shape according to the inclined surface of the connector,
The rotational force of the screw can be efficiently converted into movement of the horizontal portion of the connector in the insertion direction.

〔Example〕

The present invention will be further described in detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 shows a typical embodiment of the present invention, in which A is a partition panel, 1 is a supporting rod, 2 is a horizontal rod, 3 is a connecting tool for connecting the supporting rod 1 and the horizontal rod 2, and 4 is a connecting rod. A panel plate mounted between the frame bodies formed by the supporting rod 1 and the horizontal rod 2, 5 a cap fitted on the upper and lower ends of the supporting rod 1, 6 an adjuster incorporated in the cap 5,
Reference numeral 7 denotes connecting members for connecting the adjacent supporting rods 1 and 1 '.

The feature of the present invention is that the supporting rods 1 standing upright on both sides and the horizontal rods 2 extending vertically are connected by a connecting tool 3 firmly and without rattling, and the assembling and disassembling work thereof is easy, and the connection is made. The point is that a connecting device is constructed in which the tool 3 is completely housed in the supporting rod 1 and the horizontal rod 2. The present invention will be further described below.

The partition panel A of the present embodiment is provided with support rods 1, 1 which are erected on both sides.
At the same time as connecting the horizontal rods 2, 2 to the upper and lower parts of the support rod 3 by a connecting tool 3 to form a frame body, a panel plate 4 is fitted between the frame bodies, and a cap 5 is attached to the upper and lower ends of the supporting rod 1. The adjuster 6 is fitted and screwed to both the lower and upper and lower caps 5 so that the adjuster 6 can be adjusted vertically and can be supported by butting between the floor and the ceiling. A plurality of supporting rods 1 and 1'are connected by a connecting member 7 in a bent shape at any angle including a straight shape or a right angle so as to be self-supporting.

The supporting rod 1 is formed by extrusion molding a hollow rod into a shape of a synthetic resin, and forms a recessed groove 9 in which the width of the opening edges 8 and 8 is narrower than the inside, and the bottom surface of the recessed groove 9 is formed inside. A partition wall 10 is integrally formed over the entire length, and a connecting groove 11 into which one side of the connecting member 7 is fitted is formed on the outer entire length. Further, the partition wall 10 at a position closer to the center by a predetermined distance from the upper and lower ends. An engagement hole 12 is formed in the central portion. The engagement hole 12 does not have to be a through hole as shown in the drawing, but merely a recess has the same function and effect, and the formation position thereof is not two places in the upper and lower parts, but may be appropriately adjusted in the vertical direction. Forming a plurality of pieces at intervals is also practical when the supporting rod 1 is cut to an appropriate length for use. More specifically, the entire cross-sectional shape is formed into a horseshoe shape, the open end edge is formed as an opening edge 8,8, and a step portion is provided inside the opening edge 8 to form a bulging portion 13, Then, the opening edge is formed inside the opening edge 8 to a predetermined depth.
The partition wall 10 is laid in parallel with a line connecting 8, 8 and the connecting groove 11 is formed by denting an outer edge, that is, a top edge of a curved surface of a horseshoe inward inward in a substantially circular shape.

The horizontal rod 2 is extruded in the shape of a hollow rod having an outer shape of a substantially quadrangular cross section, and a concave groove 15 is formed in the entire length of one side located vertically inward so that the width of the opening edges 14 and 14 is narrower than that of the inside. In addition, the partition wall 16 serving as the bottom surface of the groove 15 is formed inside.
Are integrally formed, and the bulging portion 17 is formed by providing a slope inside the opening edge 14, and is partitioned by the partition wall 16 in the central portion near the center in the longitudinal direction by a predetermined distance from both outer ends. A screw hole 19 penetrating into the hole 18 having a quadrangular cross section is formed, and the tip of the screw 20 screwed into the screw hole 19 from the outside and having a taper of about 45 degrees is projected into the hole 18. I am doing it. Here, the screw holes 19 are formed at two places at both ends, but a plurality of screw holes 19 may be provided at appropriate intervals in the length direction,
It is practical when the horizontal rod 2 is cut to an appropriate length for use. The supporting rod 1 and the horizontal rod 2 are formed by extrusion molding using a synthetic resin, but it is also possible to extrude molding using a metal such as aluminum, and the external shape is the same as that described in this embodiment. It is not limited.

The connecting member 3 has a vertical portion 21 as shown in FIGS.
The horizontal portion 22 and the horizontal portion 22 are formed in a substantially L-shape in a side view, and one vertical portion 21 is formed in a substantially trapezoidal shape in a plan view that can be inserted into the concave groove 9 of the supporting rod 1 from an end thereof. The slope when inserted
As shown in FIG. 3, 23 abuts on the bulging portion 13 to prevent the side portion from coming off, and further forms a screw hole 24 penetrating from the upper bottom to the lower bottom of the trapezoidal portion. The tip of the screw 25, which is screwed from the side, with a taper of about 45 ° is formed on the partition wall of the supporting rod 1.
The other horizontal portion 22 is formed in a substantially square shape so that it can be inserted into the hole 18 of the horizontal rod 2 from the end, and the outer surface is partly formed. A notch is formed with an inclined surface 27 of about 45 degrees on the tip side in the notch 26, and when engaged in the hole 18 of the horizontal rod 2, the screw
The tip of 20 is set in a positional relationship where it abuts on the inclined surface 27, and the screw 20 is tightened in a direction in which the screw 20 is more fitted and inserted.

The panel plate 4 connects the supporting rod 1 and the horizontal rod 2 to the connecting member 3
In the present embodiment, the same shape is retained in the groove 9 formed in the supporting rod 1 and the groove 15 formed in the lateral rod 2 in this embodiment. A member 28 is fitted and supported on its four sides by the holding member 28, and the one shown in FIG. 1 is a plate body in which a large number of square holes are punched. The holes to be punched can be formed in various shapes such as circular holes, elliptical holes, triangular holes, etc., in addition to the square holes. Further, it is of course possible to use a glass plate or a blind plate.

Here, the shape of the holding member 28 is as shown in FIG.
As shown in the figure, it is extruded and molded into a substantially U-shaped cross section with a hard synthetic resin, and the outer sides of the two holding pieces 29, 29 are bulged to form the bulged portion 13 in the groove 9 of the supporting rod 1 or the lateral rod 2. Bulging part 17 in the groove 15
A protruding portion 30 is formed to prevent slipping off of the
Base piece 3 in which the inside of the tip of 9,29 and both holding pieces 29, 29 are continuous
A cushioning material 32 and 33 formed of a soft synthetic resin is adhered to the inside of 1 to be formed. The cushioning material 32 has a crescent-shaped void 34 formed inwardly curved in the center of the cross section and is adhered to the holding piece 29 outside the void 34, that is, by a chain line in FIG. Peel off the indicated part and use both cushioning materials 32, 32
The distance between them is changed from d ₁ to d ₂ .

Further, the cap 5 is provided with an end portion of the support rod 1 on one of the upper and lower sides of a closing plate 35 having a shape in plan view which substantially matches the outer cross-sectional shape of the support rod 1 as shown in FIGS. The projecting portion 37 that is fitted into the opening 36 defined by the partition wall 10 is integrally formed.

The adjuster 6 is a closing plate for the cap 5.
An adjustment screw hole 38 formed vertically through the protrusion 37 from the reference numeral 35 and a disc-shaped ground plate 39 are fixedly or rotatably connected to the lower end of the adjustment screw hole 38 and screwed into the adjustment screw hole 38 so that the adjustment screw hole 38 can be adjusted vertically. The adjusting screw shaft 40 is provided. The adjuster 6 may be attached to the cap 5 fitted to the upper end of the supporting rod 1 by forming the adjusting screw hole 38, instead of being provided on the cap 5 fitted to the lower end of the supporting rod 1. . Further, when the partition panel A is erected on the carpet floor 41, an auxiliary ground plate 44 having a surface fastener 43 as a movement restricting means attached to the lower surface is formed in a recess 42 formed by hollowing out the central portion of the lower surface of the ground plate 39. Located,
A screw shaft 45 erected on the auxiliary ground plate 44 is screwed to the ground plate 39 so as to be vertically adjustable, and the carpet floor 41 and the hook-and-loop fastener.
By contacting 43, the position of the partition panel A is prevented from being easily displaced. The auxiliary grounding plate 44 is set slightly above the lower end of the grounding plate 39 so that the weight of the partition panel A is received by the grounding plate 39 having high strength, and the auxiliary grounding plate 44 regulates lateral movement. Preferably. Although the hook-and-loop fastener 43 is used as the movement restricting means here, a soft rubber or the like having the same function and effect can be appropriately adopted, and the soft rubber or the like is simply protruded downward in the recess 42 of the ground plate 39. It is also possible to decorate it. Furthermore,
Although not shown, in the case of a cushion floor, the ground plate
It is also possible to form a needle-like protrusion as a movement restricting means on the lower surface of 39, and when the ground plate 39 of the adjuster 6 screwed to the upper cap 5 is brought into contact with the ceiling, the contact of the adjuster 6 at the upper side is made. If the ground plate 39 is also equipped with the auxiliary ground plate 44 having a needle-shaped projection, the lateral displacement can be more reliably regulated.

Further, the connecting member 7 has, as shown in FIGS. 1, 3, and 4, at its side ends, projecting edges 45 having a substantially circular cross section, which are fitted into the connecting groove 11 of the supporting rod 1, Plural line grooves 46 between the ridges 45, 45,
It is formed by extrusion into a shape in which curtains 47 having both sides are connected to each other, and is preferably formed of a flexible synthetic resin. In the present embodiment, the curtain plate 47 has a shape in which a cylinder having a diameter smaller than the diameter of the projecting edge 45 is continuously formed so as to be easily bent and curved with a uniform curvature as a whole.
When it is mounted between 1 and 1, it is visually considered by the plurality of grooves 46 so as not to look wide. FIG. 4 (a) is a connecting member 7 for connecting two adjacent partition panels A and A'as described above, and FIGS. 4 (b) and 4 (c) are connecting members for connecting three and four. In another embodiment of No. 7, a curtain plate 47 is formed to have a substantially Y-shaped cross section and a substantially cross-shaped cross section, and the projecting edges 45, ...

However, when assembling the partition panel A,
The vertical portion 21 of the connector 3 is fitted into the lower end concave groove 9 of 1,1 from below, and the partition wall 10 is pressed by the tip of the screw 25 screwed into the screw hole 24 of the vertical portion 21, and the slope 23 is fixed. In a state in which the bulging portion 13 is pressed and engaged to regulate the vertical movement, the horizontal portions 22, 22 of the connecting tools 3, 3 are inserted into the holes 18 at both ends of the horizontal rod 2 in which the holding member 28 is fitted in the concave groove 15. 22 and the screw 20 screwed into the screw hole 19
The tip end of the support is pressed against the inclined surface 27 of the horizontal part 22 to firmly prevent the device from coming off, and the recessed grooves 9 and 9 of the supporting rods 1 and 1 erected on both sides.
The holding members 28, 28 are fitted into the inside from above, and the panel plate 4 is inserted between the holding pieces 29, 29 of the three holding members 28 ,. The horizontal portion 22 of the connecting tool 3 is laterally fitted into the both end holes 18 of the rod 2 and fixed in the same manner as described above, and in this state, the upper end groove 9 of both the supporting rods 1 and 1 is inserted.
The vertical portions 21 of the connecting members 3, 3 attached to both sides of the horizontal rod 2 from above are fitted and inserted in the same manner as described above, and the panel is provided between the holding pieces 29, 29 of the holding member 28 attached to the horizontal rod 2. The upper edge of the plate 4 is inserted, the panel plate 4 is mounted in the frame body, and the projections 37 of the cap 5 are fitted into the openings 36 at the upper and lower ends of the supporting rod 1, and the lower cap 5 is fitted. Formed adjustment screw hole
The screw shaft 40 of the adjuster 6 is screwed onto the screw 38 to complete the process. Further, when the engaging hole 12 is formed in the partition wall 10 of the supporting rod 1, the tapered tip end of the screw 25 screwed into the vertical portion 21 of the connecting tool 3 is press-engaged with the engaging hole 12. By doing so, the vertical movement can be regulated more reliably, and the attachment height of the connecting tool 3 can be positioned. When the supporting rod 1 is erected between the floor 41 and the ceiling 48 as shown in FIG. 8, an adjusting screw hole 38 is also formed in the upper cap 5, and the screw shaft 40 of the adjuster 6 is similarly screwed. In combination, the height adjustment function can be provided vertically, and both adjusters 6, 6 can be installed upright by butting between the floor 41 and the ceiling 48. When a plurality of partition panels A, A'are connected to each other, the upper and lower caps 5 are fitted to the supporting rod 1 before the connecting groove 11 of the supporting rod 1 is fitted.
After slidably engaging the projecting edge 45 of the connecting tool 7 with the
The cap 5 is fitted to prevent the connecting tool 7 from coming off.

Here, in the above-described assembly order, the vertical portion 21 of the upper connecting tool 3 cannot be firmly connected by the screw 25, but in the case of the panel plate 4 made of a normal punching thin plate, sufficient supporting strength is obtained. can get. Further, in the case of a heavy panel plate 4 such as a glass plate, if the order of assembling is changed, that is, the holding member 28 and the upper and lower connecting tools 3,
After the vertical portion 21 of 3 is fitted and the screw 25 is screwed into the screw hole 24 of the vertical portion 21 to firmly fix it, the upper and lower horizontal rods 2 and 2 in which the holding member 28 is fitted in the groove 15 are attached. The horizontal portions 22 of the connecting member 3 are attached to both ends of the horizontal rod 2 while being inserted and attached to the upper and lower edges of the panel plate 4.
By inserting and screwing the screw 20 into the screw hole 19 of the horizontal rod 2 and firmly connecting them, it is possible to increase the support strength by the frame body composed of the support rod 1 and the horizontal rod 2.

[Effect of device]

According to the above-described device for connecting the supporting rod and the horizontal rod in the partition panel according to the present invention, the connecting groove is formed from above in a concave groove in which the width of the opening edge is set to be narrower than the inside of the supporting rod. A vertical part with a trapezoidal shape is inserted, and a screw is screwed into a screw hole penetrating from the upper bottom to the lower bottom of the vertical part, and its tip is located a certain distance from the upper and lower ends of the partition wall inside the supporting rod toward the center. The engaging hole formed at the position is press-engaged, and the horizontal portion of the connecting tool is laterally fitted and inserted into substantially square holes that are opened laterally at both ends of the horizontal rod. By simply pressing the tip of the screw screwed into the screw hole formed on the side surface against the inclined surface formed on the tip end side of the cutout portion of the horizontal portion, the engagement hole and the tip of the screw are engaged, whereby Setting the mounting height position, that is, the mounting position of the horizontal rod with respect to the supporting rod accurately, makes it extremely easy and strong to assemble. Shining can, also it can be easily disassembled by simply loosening the two screws when decomposing.

Then, in the connected state, the partition wall serving as the bottom surface of the groove of the supporting rod is pressed by the tip of the screw screwed to the vertical portion of the connecting tool, and the slope of the trapezoid is narrower than the inside of the groove. Since it is pressed against the inside of the opening edge, the fitting of the vertical portion and the concave groove can be made stronger, and the tip of the screw can be pressed into the engaging hole formed in the partition wall. Vertical movement can be reliably regulated, and by pressing the inclined surface of the horizontal part of the connecting tool by the tip of the screw screwed into the screw hole of the horizontal rod, the horizontal part can be slid in the insertion direction. It is possible to maintain a connected state that does not loosen or rattle even when used for a long period of time. The connector can be attached at a position corresponding to the engaging hole in the groove of the supporting rod, and the engaging hole can be formed according to the vertical width of the panel plate mounted between the upper and lower horizontal rods. Therefore, it can be used for panel boards of any vertical width. Further, since the vertical part of the connector is completely inserted into the supporting rod and the horizontal part is completely inserted into the lateral rod, the connector is not exposed to the outside, and the appearance should be excellent. You can

Furthermore, by forming the tip of the screw screwed into the vertical portion into a taper shape and making the inner diameter of the engaging hole smaller than the outer diameter of the screw, it is possible to realize a pressing engagement state without rattling.

Further, since the tip of the screw screwed into the screw hole of the horizontal rod is formed in a tapered shape in accordance with the inclined surface of the connector, the rotational force of the screw is efficiently transferred in the insertion direction of the horizontal portion of the connector. It can be converted into movement.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a typical embodiment of the present invention, and FIG.
The figure is a vertical cross-sectional front view of the lower part in the state in which the partition panel is assembled, Fig. 3 is a plan view of the connecting part excluding the upper cap, and Fig. 4 (a) is a partial perspective view of the bidirectional connecting tool. (B) is a partial perspective view of the three-way connecting tool, FIG. 4 (c) is a partial perspective view of the four-way connecting tool, FIG. 5 is a cross-sectional plan view of a state where a panel plate is attached to the supporting rod, FIG. 6 Is a vertical cross-sectional side view in which the panel plate is attached to the horizontal rod, FIG. 7 is an enlarged cross-sectional view of the holding member fitted in the groove of the supporting rod and the horizontal rod, and FIG. 8 is a view of connecting two partition panels. It is a simplified front view of a state. A: screen panel, 1: supporting rod, 2: horizontal rod, 3: connecting tool, 4: panel plate, 5: cap, 6: adjuster, 7: connecting tool, 8: opening edge, 9: concave groove, 10: Partition wall, 11: connecting groove, 12: engaging hole, 13: bulging portion, 14: opening edge, 15: concave groove, 16: partition wall, 17: bulging portion, 1
8: Hole, 19: Screw hole, 20: Screw, 21: Vertical part, 22: Horizontal part, 23:
Slope, 24: screw hole, 25: screw, 26: notch, 27: inclined surface, 28:
Holding member, 29: Clamping piece, 30: Projection part, 31: Base piece, 32: Cushioning material, 33: Cushioning material, 34: Void, 35: Closing plate, 36: Opening, 37: Projection, 38: For adjustment Screw hole, 39: Ground plate, 40: Adjustment screw shaft, 41: Carpet floor, 42: Recessed part, 43: Hook-and-loop fastener (movement restriction means), 44: Auxiliary ground plate, 45: Projected edge, 46: Strip groove, 47: curtain plate,
48: Ceiling.

Claims (3)

[Scope of utility model registration request] 1. A partition panel in which a panel plate is mounted in a frame body formed by supporting rods on both sides and upper and lower horizontal rods, which is formed into a hollow rod shape, and the width of the opening edge is narrower than the inside in the entire length of the inside. A support rod formed by forming a set recessed groove, forming a partition wall serving as the bottom surface of the recessed groove over the entire length, and forming an engaging hole in the partition wall at a position closer to the center by a predetermined distance from the upper and lower ends. And a horizontal rod having at least both ends formed with a substantially square hole that opens laterally and a screw hole that penetrates into the hole at a position closer to the center in the longitudinal direction by a predetermined distance from both outer ends. A vertical portion having a trapezoidal shape in a plan view that can be inserted into the groove of the supporting rod from above and below and a horizontal portion that can be inserted into the hole of the horizontal rod are formed into a substantially L-shape, and above the vertical portion. Form a tip on the partition wall with a screw hole that penetrates from the bottom to the bottom. An inclined surface into which a screw that can be press-engaged with the engaging hole is screwed, and the tip of the screw that is screwed into the screw hole of the horizontal rod can be pressed against the tip end side of the notch formed in the outer surface of the horizontal portion. And a connecting device for connecting the supporting rod and the horizontal rod in the partition panel. 2. A utility model registration claim in which the tip of a screw screwed into the screw hole of the connecting tool is tapered and the inner diameter of the engaging hole of the supporting rod is set smaller than the outer diameter of the screw. 5. A connecting device between a supporting rod and a horizontal rod in a partition panel as set forth in claim 1. 3. A support for a partition panel according to claim 1, wherein a tip of a screw screwed into a screw hole of the horizontal rod is formed in a taper shape corresponding to an inclined surface of the connector. A connecting device between the rod and the horizontal rod.