JP2009191470A - Connection structure of grating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection structure of a grating enabling the complete theft prevention of the grating at low cost and serving for preventing the grating from being lifted up by a vehicle traveling thereon. <P>SOLUTION: This connection structure of a grating comprises a bolt 1 having a flange part 1b on one bottom surface side of a column part 1a and a bolt shaft 1c vertically extending from the column part on the other bottom surface side; a nut base 2a having a female screw part 20 screwed with the bolt shaft 1c formed in a through-hole extending through a truncated conical body from the lower bottom to the upper bottom; and a connection clip 3 having a top end connected to a top plate part 3b with a pair of leg parts 3a opposed thereto and having a through-hole formed therein near the bottom ends of both the leg parts. Both end plates 71 of two gratings 7 are made to abut on each other, both leg parts 3a of the connection clip 3 are inserted between both the end plates. The bolt 1 is inserted into both leg parts 3a projecting downward from both the end plates 71 from a through-hole 30 in one leg part to a through-hole in the other leg part by the insertion. The column part 1a is inserted into the through-hole 30 until the flange part 1b abuts on the outer surface of the leg part 3a, and the nut base 2a is screwed to the bolt shaft 1c projecting from the other through-hole 30 by the insertion for connecting two gratings 7 to each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a connecting structure for a grating disposed in a side groove or the like.

  Grating is used to improve drainage in road side grooves (rainwater grooves) and the like, and metal gratings are generally used frequently from the viewpoint of strength. However, because the grating is made of metal, news of theft is being reported all over the country as the price of metal rises. If the grating is stolen, the vehicle falls into a gutter groove on the upper surface opening, leading to a traffic accident or a fall accident of a child. Therefore, there is an increasing demand for theft prevention from the viewpoint of safety. The general-purpose grating 7 shown in FIG. 2, FIG. 3, FIG. 11, and FIG. 12 has a structure that is simply placed on the top opening of the side groove and is relatively easy to remove. It has been considered difficult. Several proposals have been made for connecting structures for gratings intended to prevent theft (for example, Patent Documents 1 to 3).

JP 2006-336345 A JP-A-9-250165 Utility Model Registration No. 3133644

However, any of the inventions of Patent Documents 1 to 3 enable the removal of the grating as long as time is required. Once the structure was understood, there was a risk of being removed skillfully. Further, Patent Documents 1 and 3 are gratings obtained by improving a general-purpose type, and it is troublesome because a different grating from a general-purpose product must be manufactured. Since it is not versatile, the application range may be limited.
In addition, the grating is often provided along or crosses a road or a sidewalk, and it has been pointed out that when the vehicle travels on the grating, the grating rises. A grating connecting structure useful for preventing such lifting is also being pursued, but the invention of Patent Document 2 was insufficient.

  The present invention solves the above-mentioned problems, and can be applied to existing gratings. In addition, the present invention provides a grating coupling structure that can be completely prevented from theft at a low cost and that is also useful for preventing escaping of the vehicle by traveling. The purpose is to do.

In order to achieve the above object, the gist of the invention described in claim 1 is that the bottom surface side of one of the pillar portions projects outward to form a circular flange portion when viewed from the side, while the bolt shaft is suspended from the other bottom surface side. A bolt (1) to be installed, and a male screw of the bolt shaft in a through-hole penetrating from the lower base to the upper base or a concave hole recessed from the lower base to the upper base in the shape of a truncated cone or column A nut base (2a) formed with a female threaded portion to be screwed to the portion, and a pair of leg portions facing each other, both upper ends are connected by a top plate portion, and a connection hole is provided near the lower ends of both leg portions. A clip (3), and both end plates of the two gratings are brought close to or in contact with each other, and both leg portions of the connecting clip are inserted so as to straddle the both end plates from above, and both end plates are inserted by the insertion. The other leg from the through-hole of one leg related to the both legs protruding downward The bolt is inserted into the through-hole, the column portion is inserted into the through-hole, and the flange is brought into contact with the outer surface of the leg portion, while the bolt shaft protrudes from the other through-hole by the insertion. In the connecting structure of the grating, the nut base is screwed to connect the two gratings.
According to a second aspect of the present invention, there is provided a connecting structure for a grating according to the first aspect, wherein an engaging portion is formed on the nut base portion via a constricted portion, and a tool is engaged with the engaging portion to rotate the bolt. Strengthening the screwing of the shaft and the female threaded portion, dividing by the constricted portion, and screwing the nut base portion stripped of the engaging portion to the bolt shaft protruding from the other through hole. . The connecting structure of the grating according to the invention of claim 3 is the spacer according to claim 2, wherein the bolt shaft is inserted into the cylindrical body, and the cylinder length is shorter than the distance between the pair of leg portions ( 4), wherein the bolt is loosely inserted into the spacer from the through hole of the one leg and the bolt is inserted into the through hole of the other leg. The connecting structure of the grating according to the invention of claim 4 is the connecting structure of claim 2 or 3, wherein the flange portion is made of a disk, the pillar portion is a prismatic portion, and the through hole is a vertically long hole. The width of the vertically long hole is made to coincide with that of the vertically long hole so that the rectangular column part cannot be rotated by being inserted into the vertically long hole.

  The connection structure of the grating according to the present invention provides a thorough anti-theft measure and can be applied to existing gratings because it does not require any improvement on the grating side. It is extremely useful and useful.

Hereinafter, the connecting structure of the grating according to the present invention will be described in detail.
(1) Embodiment 1
1 to 10 show an embodiment of a grating connecting structure according to the present invention. FIG. 1 is an exploded perspective view of each component used for the connection. FIG. 2 is a grating connecting structure using each component shown in FIG. 3 is a cross-sectional view taken along the line VI-VI in FIG. 2, and FIG. 4 is a longitudinal sectional view of the connecting portion in FIG. 2, in which (a) is a stage in which a nut base portion of a fastener is screwed onto a bolt shaft. FIG. 5B is a vertical cross-sectional view after the engaging portion is removed by the constricted portion by rotating the engaging portion with the tool engaged from the state of (B) in (B). 5 is a partial perspective view around the connecting clip of FIG. 4B, FIG. 6 is a view taken along the line VV in FIG. 4, FIG. 7 is a view taken along the line VV in FIG. , FIG. 9 is a longitudinal sectional view using bolts and fasteners of different forms different from the bolts and fasteners of FIGS. 1 to 6, and is a longitudinal sectional view corresponding to FIG. FIG. 1 shows a male screw portion formed on the entire bolt shaft, and FIG. 2 shows a simplified illustration with a reduced number of connecting members.

The connecting structure of the grating includes a bolt 1, a stopper 2, a connecting clip 3, and a spacer 4 (FIG. 1).
The bolt 1 is a metal connecting component including a column portion 1a, a flange portion 1b, and a bolt shaft 1c. The bolt 1 has one bottom surface side 11 projecting outward to form a flange portion 1b having a circular shape in side view, and a bolt shaft 1c suspended from the other bottom surface side 12. Here, the column part 1a is a prismatic part 10 made of a hexagonal cylinder having a small cylinder as shown in FIGS.
The flange portion 1b is a flange that protrudes outward on one bottom surface side 11 of the column portion 1a corresponding to the bolt head. The flange 1b is circular in a side view and is difficult to turn even if it is gripped and rotated with a tool such as a spanner or a wrench. For example, in addition to the disk 13 of FIG. 1, there are a spherical disk shown by a solid line in FIG. 8, a cylinder, a cone, a truncated cone, etc. shown by a chain line in FIG. Here, the flange portion 1 b is a disc 13. When the collar portion 1b is a disc 13 as shown in FIG. 1, even if it is turned with a tool such as a pipe wrench, it is circular and easy to slide, and since it is thin and difficult to grasp, the countermeasures against theft are perfect. Further, the disc 13 is more preferable because it leads to weight reduction and low cost. The bolt shaft 1c is a shaft body that forms a male screw in the shaft portion, and is suspended from the bottom surface side 12 of the column portion 1a opposite to the side 11 on which the flange portion 1b is present. The axis of the bolt shaft 1c is made to coincide with the center of the bottom surface of the column portion 1a, and the shaft diameter of the bolt shaft 1c is made slightly smaller than the bottom surface diameter of the column portion 1a. The base end portion of the bolt shaft 1c can be used as it is as the column portion 1a. Here, the column portion 1a having a larger cross-sectional area than the cross-sectional area of the bolt shaft 1c is used, and the column portion 1a is as shown in FIG. Hexagonal column part. The prism 10 may be a prism such as a quadrangular prism as shown in FIG. If the pillar portion 1a is a prism portion 10, the bolt 1 can be made non-rotatable by inserting the prism portion 10 into the vertically elongated hole 301 of the connecting clip 3 when the bolt 1 and the fastener 2 (nut base portion 2a) are assembled. Assembling workability between the bolt 1 and the stopper 2 is improved.

  The stopper 2 is a metal connecting part including a nut base portion 2a, a constricted portion 2b, and an engaging portion 2c. The nut base portion 2a is formed in a truncated cone shape, and an internal thread portion 20 that is screwed into the bolt shaft 1c is formed in a through hole 21 that passes from the lower base 23 to the upper base 24 thereof. The nut base portion 2a of the present embodiment is a truncated cone as shown in FIGS. 4 and 5, and the internal thread portion 20 is formed over the entire inner surface of the through hole 21 passing through the axis. The size of the lower surface of the nut base 2a is made larger than that of the through hole 30 provided in the connecting clip 3. The constricted portion 2b is a short cylindrical portion having a smaller cross-sectional area than the upper base 24 and the engaging portion 2c of the nut base 2a, and makes it easy to separate the nut base 2a from the engaging portion 2c at the constricted portion 2b. The engaging portion 2c is a portion that forms a square portion that engages with a spanner or wrench tool, and is connected to the nut base portion 2a via the constricted portion 2b. A constricted portion 2b having a small cross section extends from the upper base 24 of the nut base portion 2a, and an engaging portion 2c having a larger cross-sectional area than the end surface extends from the end surface of the constricted portion 2b. The engaging portion 2c of the present embodiment is a hexagonal nut-shaped body as shown in FIGS. The through hole 21 penetrates from the lower surface of the nut base portion 2a to the engaging portion 2c via the constricted portion 2b, and an internal thread portion 20 is provided on the inner surface of the constricted portion 2b and the through hole 21 of the engaging portion 2c. Absent. The diameter of the through hole 21 in the constricted portion 2b and the engaging portion 2c is larger than the screw diameter of the female screw portion 20 of the nut base portion 2a, and these portions are formed as fool holes 26 and 28 with respect to the bolt shaft 1c.

  The fastener 2 is not limited to the shape shown in FIG. 1, and a female screw portion 20 that is screwed into the bolt shaft 1c is formed in a recessed hole 22 that is recessed from the lower base 23 to the upper base 24 of the nut base 2a. The fastener 2 as shown in FIG. The nut base 2a shown in FIG. 9 is obtained by embedding a known nut 25 having the female screw portion 20 in the concave hole 22 and then integrating it as a nut base 2a by welding or the like. The nut base 2a can also be a cylindrical body as shown by the chain line in FIG. However, the nut base 2a of the truncated cone is more preferable because it is difficult to grasp with a pipe wrench or the like.

The connection clip 3 is a connection component in which a pair of leg portions 3a are opposed to each other, both upper ends thereof are connected by a top plate portion 3b, and through holes 30 are provided near the lower ends of both leg portions 3a. The connection clip 3 of the present embodiment is a processed product of a metal strip, and is a plate-shaped body having a substantially U-shape in side view by connecting the upper ends of a pair of plate-like leg portions 3a with the plate surfaces facing each other by a top plate portion 3b And The through hole 30 is a vertically long hole 301 as shown in FIGS. By aligning the horizontal width W ₁ of the vertical hole 301 with the horizontal width W ₂ of the rectangular column part 10 and inserting the rectangular column part 10 into the vertical long hole 301, the rectangular column part 10 (that is, the bolt 1) rotates with respect to the connection clip 3. A vertically long hole 301 that cannot be moved is provided (FIG. 6). The width W ₁ of the longitudinal bore 301 with respect to the width W ₂ of the prism portion 10 slightly larger, both are to fit. The reason why the vertically long hole 301 is made vertically long is that when the prismatic part 10 is inserted into the vertically long hole 301, a space is secured in the vertically long direction to facilitate insertion. Here, the connecting clip 3 is substantially U-shaped in a side view, but is a plate-like connecting clip 3 having a substantially Ω-shape in a side view in which the distance between the lower ends of both legs 3a is narrowed, and both legs are made use of the elasticity of the clip. If the lower end opening of the portion 3a is widened so that both the leg portions 3a can be inserted across the both end plates 71 of the two gratings 7A and 7B, the degree of adhesion between the connecting clip 3 and the grating 7 can be increased, which is more preferable. .

  The spacer 4 is a metal cylindrical body through which the bolt shaft 1c can be inserted through the cylinder 41. The cylinder length of the spacer 4 is shorter than the distance between the two leg portions 3a. However, the spacer 4 is loosely inserted from the vertically long hole 301 (through hole 30) of the one leg portion 3a, and the other leg portion 3a is inserted. The nut base 2a can be screwed onto the bolt shaft 1c inserted into the through hole 30. More specifically, in the state of FIG. 4 in which the nut base portion 2a is screwed to the bolt shaft 1c, the connection clip 3 is substantially maintained in a side view before attachment, and the spacer 4 is clamped by both the leg portions 3a. (Not shown) As shown in FIG. 4, the cylinder length of the cylindrical body 40 is determined so as to be sandwiched between the prism 10 and the leg 3a. Due to the presence of the spacer 4, the connecting clip 3 that is easily deformed in a substantially U shape in a side view can be maintained by screwing the bolt 1 and the stopper 2 together. If the shape of the connecting clip 3 can be maintained, the plate thickness can be reduced.

In FIG. 10, the code | symbol 6 shows a removal tool. It is not a part directly related to the connecting structure of this grating. There may be a case where it is desired to separate the two gratings 7A and 7B connected by the main bolt 1, the stopper 2, etc. for maintenance, etc., but the removal tool 6 is a tool used at that time.
The removal tool 6 includes an adherend portion 6a, a square processed portion 6b, and a set screw 6c. The adherend portion 6a is an umbrella-like body, and when this is put on the nut base portion 2a, the inner surface of the adherend portion 6a comes into contact with the outer surface (conical surface) of the nut base portion 2a. A plurality (three in this case) of female screw holes penetrating from the outer surface to the inner surface are formed in the adherend portion 6a. The rectangular processed portion 6b is a hexagonal nut forming portion extending from the umbrella-shaped upper end of the adherend portion 6a, and is provided with a female screw portion 63 in the nut hole in the same manner as a general-purpose nut. In FIG. 10 (a), the internal thread portion is screwed into the bolt shaft 1c protruding from the nut base portion 2a and rotated in the direction of the rotation arrow as shown in the figure, so that the inner surface of the adherend portion 6a is attached to the nut base portion 2a. It can be brought into close contact with the outer surface (b in FIG. 6). The set screw 6c has a sharpened tip of a male screw portion 65 screwed into the female screw hole, and a hexagonal hole portion 66 provided on the base end side. From the state of FIG. 10 (b), the set screw 6c is screwed into the female screw hole and tightened with a hexagonal shaft-shaped tool using the hexagonal hole 66, whereby the tip of the set screw 6c bites into the nut base 2a. Thereafter, the tool 6 such as a wrench is engaged with the square processing portion 6b and rotated in reverse to remove the removal tool 6 integrated with the nut base portion 2a from the bolt 1 as shown in FIG. The two gratings 7A and 7B which have been connected so far can be separated by disassembling into respective connecting parts such as the bolt 1, the nut base 2a (fastener 2), and the connecting clip 3.
On the other hand, in the nut base 2a in which a truncated cone-like body as shown in FIG. 9 is formed and a female screw part 20 is formed in a recessed hole 22 that is recessed from the lower base 23 toward the upper base 24. However, although the basic configuration is the same as that of the removal tool 6, the internal thread portion 63 is not provided in the square processed portion 6 b. The inner surface of the adherend portion 6a is provided on the outer surface of the nut base portion 2a so as to be in close contact with the outer surface of the nut base portion 2a so as to be dotted with depressions (not shown) at portions facing the female screw holes. When the set screw 6c is screwed into the female screw hole and tightened from the state of FIG. 6 (b) to the recess, the tip of the set screw 6c enters the recess. Thereafter, a tool such as a wrench is engaged with the square machining portion 6b and rotated reversely, whereby the nut base portion 2a can be integrated with the removal tool 6 and easily removed from the bolt 1. Here, by changing the location of the female screw hole, it is very difficult to manufacture the detachable tool 6 that can remove the nut base 2a from the bolt 1, and it is provided with a stone against theft.

Next, a description will be given of a connecting structure of the present grating using the bolt 1, the fastener 2, the connecting clip 3, and the spacer 4.
The grating 7 used here is a general-purpose grating as shown in FIGS. The overall shape is a rectangular disk shape with a standardized shape, and a metal grating including a main member 72, a connecting member 73, a side plate 70, and an end plate 71 is used. A main member 72 made of a large number of metal strips and a connecting member 73 perpendicular to the main members 72 are formed in a lattice shape, and both side surfaces thereof are surrounded by L-shaped side plates 70 in a side view (FIG. 3). Both ends of the main member 72 are used as end plates 71 to form a rectangular board. The connecting member 73 is also called a cross bar, and is composed of a twisted bar in which a metal bar is twisted. The connecting members 73 are placed on the upper surface of the main member 72 while maintaining a state in which a plurality of main members 72 are vertically erected in the band width direction and arranged at a predetermined pitch, and are spaced apart from each other by a predetermined interval. The Thereafter, the main member 72 and the connecting member 73 are assembled into a rectangular board having a grid shape by electric pressure contact fixing. Symbol SL indicates a slit. The main member 72 uses an I-bar as shown in FIGS. 3 and 4, but is simply shown as a flat bar in FIG. The grating 7 is disposed so as to cover the upper surface opening of the side groove. Reference numeral 90 denotes a bottom portion of the side groove, reference numeral 91 denotes a side portion of the side groove, and reference numeral 92 denotes a running water groove.
In a plurality of gratings 7 connected to the side groove, two adjacent gratings are connected as follows to provide a grating connection structure in which anti-theft measures are taken. A plurality of gratings 7 that cover the upper surface openings of the side grooves are arranged in a vertical row, but the two gratings 7A and 7B that are close to or in contact with both end plates 71 are connected by components such as the bolt 1 or the like. Go.

  Specifically, as shown in FIGS. 2 to 4, both leg portions 3 a of the connecting clip 3 are inserted from above so as to straddle both end plates 71 of two adjacent gratings 7 </ b> A and 7 </ b> B. Also, the bolt 1 is inserted from the through hole 30 of one leg 3a related to both legs 3a protruding downward into the through hole 30 of the other leg 3a. The spacer 4 is loosely inserted from the through hole 30 of one leg 3a, and the bolt 1 is inserted into the through hole 30 of the other leg 3a. Then, the column part 1a is inserted into the through hole 30 and the flange part 1b is brought into contact with the outer surface of the leg part 3a, while the nut base part 2a is screwed onto the bolt shaft tip 181 protruding from the other through hole 30 by insertion. The two gratings 7A and 7B are connected (a in FIG. 4). Further, by engaging and rotating a tool such as a wrench or spanner with the engaging portion 2c, the bolt shaft 1c and the nut base portion 2a are strongly screwed and separated by the constricted portion 2b. The nut base 2a from which the engaging portion 2c has been removed is screwed onto the protruding bolt shaft 1c (FIG. 4B). In the present embodiment, two connecting structures of the present grating using the bolts 1, the fasteners 2, and the like are provided on the both end plates 71 with which the two gratings 7 </ b> A and 7 </ b> B abut. Here, only the both end plates 71 and 71 with which the gratings 7A and 7B in FIG. 2 abut (or close to) are illustrated, but the left end plate 71 of the left grating 7A in FIG. The present connecting structure using the bolt 1, the nut base 2 a, etc. is also applied to both end plates of the adjacent end plate 71 of the grating 7 on the left side. A plurality of gratings 7, 7,... Covering the side grooves are integrated one after another by the connecting structure of this grating.

The connecting structure of the grating thus configured is a plurality of gratings 7, 7,... Mounted in a vertical row on the upper surface opening of the side groove, and the two adjacent gratings 7 A and 7 B are connected to the bolt 1 and the nut base 2 a. , Because the connecting clip 3 is connected and integrated, anti-theft measures are taken. By connecting the gratings 7, 7,... One after another with the bolt 1, the nut base 2 a, and the connection clip 3, it is impossible for the thief to take out the grating from the side groove.
One of the leg portions 3a projecting downward from both end plates 71 by inserting both leg portions 3a so that the top plate portion 3b of the connecting clip 3 is facing upward and straddling both end plates 71 of the two gratings 7A, 7B. Since the bolt 1 is inserted from the through hole 30 into the through hole 30 of the other leg 3a and the nut base 2a is screwed onto the bolt shaft 1c protruding from the other through hole 30, the two gratings 7A , 7B once connected, a third party cannot be removed. The gratings 7 cannot be extracted one by one. The basic structure is a screwed connection between the bolt 1 and a stopper 2 corresponding to a nut, but the bolt 1 side can also be turned by sandwiching the flange 1b with a tool such as a pipe wrench. Is slippery because of its circular shape in side view. In particular, in the case where the collar portion 1b is a disc 13 as shown in FIG. 1, it is difficult to pinch with a tool, and the structure is more difficult to be stolen. The other fastener 2 is also a truncated cone or columnar body in which the nut base 2a is screwed into the bolt 1 to form a female threaded portion 20, and a tool such as a wrench is used to sandwich the nut base 2a. Even if you turn it, it will slip. In particular, if it is a truncated cone, it is difficult to pinch with a tool such as a pipe wrench, and the structure is further less likely to be stolen.

  Further, since the fastener 2 forms the engaging portion 2c via the nut base portion 2a and the constricted portion 2b, the tool is engaged with the engaging portion 2c when the bolt 1 and the nut base portion 2a are assembled. It can be done simply by rotating the stopper 2 and tightening it to the bolt 1. By providing the engaging portion 2c, the screwing operation between the bolt 1 and the stopper 2 proceeds smoothly. On the other hand, by turning the tool forward, the screwed connection between the bolt shaft 1c and the nut base 2a is strengthened and divided by the constricted portion 2b, and the engaging portion 2c is scraped off, so that the thief leaves the remaining nut base 2a. Removal becomes difficult.

Further, the pillar portion 1a is vertically long hole 301 through hole 30 as well as the prism portion 10, and the width W ₂ of the angular bar portion 10 made to match the width W ₁ of the vertical long hole 301, the of the angular bar portion 10 Since it becomes impossible to rotate by insertion into the vertically long hole 301, it is not necessary to grip the bolt 1 side with a tool, and the screwing operation of the nut base portion 2a to the bolt 1 becomes easy. If the prism 10 of the bolt 1 is inserted into the vertically long hole 301, the bolt 1 does not rotate. Therefore, it is sufficient to screw only the stopper 2 to the bolt shaft 1c and simply tighten it with a tool. Even if trying to engage the hook 1b with a tool, it is the hook 1b originally designed to escape theft, and it is difficult to engage with the tool. The combination is extremely effective. And since the vertically long hole 301 is formed vertically in the shape of a fool, it is easy to insert the prism 10 into the vertically long hole 301, and the work performed at the side groove site is facilitated.
In addition, after loosely inserting into the spacer 4 from the through hole 30 of one leg 3a, the bolt 1 is inserted into the through hole 30 of the other leg 3a, and the bolt 1 and the nut base 2a are screwed and joined together. Even when tightened at the time of coupling, since the spacer 4 is interposed, the shape can be maintained even with the connecting clip 3 having a U-shape such as a side view that is easily deformed. Further, even if a thief tries to remove the connecting clip 3 and the nut base 2a by loosening the lower end portions of both legs 3a of the connecting clip 3 with force, it is difficult because the spacer 4 is stretched from the inside. Become. The anti-theft measure has an excellent grating connection structure.
In addition, since no processing is required for the grating 7, there is no restriction as in Patent Documents 1 and 3. Even for the existing grating 7, the connecting structure of the present grating can be easily adopted without the need for post-processing or the like, which is a very useful invention.

  On the other hand, when the mounting structure of the grating 7 using the bolt 1, the stopper 2, and the connecting nut is completed, the lifting of the grating 7 that easily occurs on the grating 7 during traveling of the vehicle is eliminated. The two gratings 7A and 7B connected by this connecting structure have the bolts 1 and the spacers 4 intersecting the both end plates 71 below the both end plates 71 even if one of the gratings 7 jumps up due to vehicle running. Since these are arranged as stoppers and locked, the lifting of the grating 7 is completely prevented. This connecting structure of the grating exhibits an extremely excellent effect for preventing the grating 7 from being raised. Demonstrate the power of accident prevention.

(2) Embodiment 2
The connecting structure of the present grating is applied to a grating having different specifications from the first embodiment.
The grating 7 in FIGS. 11 and 12 is a grating 7 with a raising member 8 as shown. Unlike the first embodiment, the side plate 70 of the grating 7 is a flat bar. The side groove is provided with a step in the side groove side portion 91 on which the raising member 8 is placed. The side sectional view of FIG. 12 is a view taken along the line VI-VI in FIG. 11, and unlike the view taken along the line IV-IV in FIG. 2 of the first embodiment, the grating 7B to which the nut base 2a is attached. It is sectional drawing seen from. Although not shown, it is of course possible to apply to the general-purpose grating 7 having no raising member 8 in FIGS. The structure and effect of such a grating connecting structure are the same as those of the first embodiment, and the description thereof is omitted. In the figure, the same reference numerals as those in FIGS. 1 to 10 denote the same or corresponding parts.

  The present invention is not limited to those shown in the above-described embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. The shape, size, number, material and the like of the bolt 1, the stopper 2, the connecting clip 3, the spacer 4, the detaching tool 6, the grating 7, etc. can be appropriately selected according to the application.

FIG. 3 is an exploded perspective view of each component used for coupling the grating according to the first embodiment. It is a top view of the connection structure of the grating using each component of FIG. FIG. 6 is a view taken along line VI-VI in FIG. 2. (A) is a longitudinal cross-sectional view of a stage where a nut base portion of a fastener is screwed onto a bolt shaft, and (b) is a longitudinal cross-sectional view of the engaging portion removed from the state of (a). FIG. 5 is a partial perspective view around the connection clip of FIG. FIG. 5 is a view taken in the direction of arrows V-V in FIG. 4. It is the VV arrow directional view of FIG. 4 of an aspect different from FIG. FIG. 5 is a longitudinal sectional view using bolts and fasteners different from those in FIG. 1, and is a longitudinal sectional view corresponding to FIG. It is a longitudinal cross-sectional view of another aspect different from FIG. It is a partial cross section explanatory view of the removal tool which removes a nut base from a bolt. In Embodiment 2, it is a top view of the connection structure of the grating using each component of FIG. It is a VI-VI arrow directional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bolt 1a Column part 1b Constriction part 1c Bolt shaft 10 Square pillar part 13 Disk 2a Stopper 2b Constriction part 2c Engagement part 20 Female thread part 21 Through-hole 22 Recessed hole 23 Lower bottom 24 Upper bottom 3 Connecting clip 3a Leg part 3b Top Plate part 30 Through hole 301 Vertically long hole 4 Spacer 7, 7A, 7B Grating 71 End plate

Claims (4)

The bottom side of one of the pillars protrudes outward to form a circular flange as viewed from the side, while the bolt (1) that hangs the bolt shaft on the other bottom side, and a truncated cone or cylinder A nut base (2a) in which a female threaded portion that is screwed into a male threaded portion of the bolt shaft is formed in a through-hole penetrating from the lower base to the upper base or a concave hole recessed from the lower base to the upper base; The upper and lower ends of the legs are connected to each other at the top plate portion, and a connecting clip (3) provided with a through hole near the lower ends of the both leg portions, and
The both end plates of the two gratings are brought close to or in contact with each other, and both leg portions of the connecting clip are inserted so as to straddle the both end plates from above, and the both leg portions projecting downward from the both end plates by the insertion While inserting the bolt from the through hole of one leg part into the through hole of the other leg part, inserting the column part into the through hole, the abutment part is brought into contact with the outer surface of the leg part, A connecting structure for a grating, wherein the nut base is screwed onto a bolt shaft protruding from another through hole by the insertion to connect the two gratings. An engaging portion is formed on the nut base via a constricted portion, and a tool is engaged with the engaging portion to rotate, thereby strengthening the screwing between the bolt shaft and the female screw portion. The grating connecting structure according to claim 1, wherein the nut base part, which is divided and protrudes from the other through hole, is screwed onto the nut base part from which the engaging part has been removed. A cylindrical body into which the bolt shaft can be inserted into a cylinder, and the cylinder length further includes a spacer (4) shorter than the distance between the pair of leg parts, from the through hole of the one leg part, 3. The grating connecting structure according to claim 2, wherein the bolt is inserted into a spacer and the bolt is inserted into a through hole of another leg. The flange portion is made of a disk, the column portion is a prismatic portion, the through hole is a vertically long hole, and the horizontal width of the rectangular hole is matched with the horizontal width of the rectangular column portion, so The connecting structure of the grating according to claim 2 or 3, wherein the prismatic part is made unrotatable by being inserted into the grating.

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