JPH07217065A - Metal grating - Google Patents

Abstract

PURPOSE:To make a connecting member so as not to meader as letting it have a nonslip function. CONSTITUTION:In a metal grating A made up of installing plural the plate-form main members 1 are parallelly installed as making the width direction up and down, and two bar connecting members 2 are mounted on these main members 1 in orthogonalizing them grid-like, and further pressing and securing the connecting parts 4, a lot of recess grooves 12 ranging from one side 13 to the other side 14 aslant are formed on top flat parts 11 of the main members 1. Straight lines orthogonalized to the main members 1 after passing through an intersection (a) between the recess groove 12 and one side 13 of the main members 1 at plate view are all getting into an area of the flat part 11 at a spot of the other side 14 of the main members 1, while other straight lines orthogonalized to the main members 1 after passing through another intersection (b) between the recess groove 12 and the other side 14 of the main members 1 are all getting into the area of the flat part 11 at a spot of the one side 13 of the main members 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metallic grating which is covered with openings such as drainage grooves.

[0002]

2. Description of the Related Art For rainwater gutters and the like in passages, gratings are used to improve drainage, and particularly metal gratings having excellent mechanical strength are often used. However,
Since it is made of metal, it has a drawback that it is slippery when an automobile or the like runs or a person walks on the grating. For this reason, as a measure for preventing slippage, measures have been taken so far in which the upper surface of the main member 1 for grating has an uneven shape (FIG. 10). For example, it is a method in which an embossed convex portion is provided on the upper surface of the main member, or as in Japanese Utility Model Publication No. 5-19425, protruding portions are formed on the convex line at a predetermined interval.

[0003]

However, it is easy to produce a product having a problem that the connecting member 2 meanders in the metallic grating A provided with the concavo-convex shape as in the prior art. In the manufacturing process of grating, generally, a plurality of strip-shaped main members 1, 1, ... Then, a rod-shaped connecting member 2 (commonly referred to as a "crossbar") is placed on the main member 1 in a cross shape in a lattice pattern. Next, a current is passed from one side to the other side, and a large current is concentrated on the joint portion 4 to heat it. After that, the connecting member 2 is embedded and fixed in the main member 1 by pressure contact. Therefore, if the upper surface 1a of the main member 1 is provided with a concavo-convex shape, the connecting member 2 falls into the concave portion 5 during this pressure contact and is easily bent.

The lower surface of the connecting member 2 is not always supported by the convex portion 6 of the main member 1, and the floating portion of the concave portion 5 has been found at several places. If the position of the convex portion 6 related to the main member 1 is to be adjusted in advance in order to solve this, a lot of time and labor must be spent, which is actually impossible. Furthermore, even if the connecting member 2 is initially supported by the convex portion 6 of the main member 1,
At the time of press contact with which a large force is applied, the connecting member 2 evades the external force and becomes a state of escaping into the recess 5, often forming a bent portion 7 (FIG. 10). Since the bent portion 7 appears on the front side of the product as it is, it does not look good and reduces the commercial value.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a metallic grating in which a connecting material does not meander while having a non-slip function.

[0006]

According to the metal grating of the present invention, a plurality of strip-shaped main members are arranged in parallel with the width direction being up and down, and the rod-shaped connecting members are orthogonal to each other in a lattice pattern. In a metal grating formed by placing a material, and further fixing the joint portion by pressure contact, in the flat portion of the upper surface of the main member,
A large number of concave grooves obliquely formed from one side to the other side are formed, and in a plan view, a straight line that passes through the intersection of the concave groove and one side of the main member and is orthogonal to the main member is the other side point of the main member. It is configured so that it enters all over the area of the flat part and that a straight line orthogonal to the main member through the intersection of the groove and the other side of the main part enters all over the area of the flat part at one side point of the main member. It is characterized by having done. Here, "made by fixing the joint by pressure" means
After heating the abutting portion of the main member and the connecting member, a large force is applied to fix them to each other.

[0007]

According to the metallic grating according to the present invention, since a large number of concave grooves are provided in the flat portion of the upper surface of the main member so as to be inclined from one side to the other side, undulations are formed on the surface of the grating to prevent slippage. become. Then, in a plan view, a straight line that passes through the intersection of the groove and one side (or the other side) of the main member and is orthogonal to the main member is on the other side (or one side) of the main member within the area of the flat portion. Since it is configured so that it will enter all the parts, any orthogonal line to the main member will include the area of the flat surface of the upper surface, and the connecting material will fall into the groove or slip even if a large external force is applied by pressure contact etc. There is no such thing.

[0008]

EXAMPLES The present invention will be described in detail below based on examples. (1) Example 1 FIGS. 1 to 5 show an example of a metallic grating according to the present invention. 1 is an enlarged perspective view of an essential part of the metallic grating, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a perspective view of a main member, and FIG.
Shows a vertical sectional view of FIG. 3, and FIG. 5 shows a plan view of FIG. The metallic grating A has a rectangular parallelepiped shape with a standardized overall shape, and a large number of main members 1, 1, ... And a connecting material 2, 2 ,. It is surrounded by a side plate 3 having a width.

The main member 1 is composed of a strip plate (commonly referred to as "I bar") having an I-shaped cross section as shown in FIG. A plurality of main members 1 are arranged in parallel with the width direction being up and down. A large number of concave grooves 12 are formed in the flat upper surface portion 11 of the main member 1 to exert a slip preventing function. These concave grooves 12, 12, ...
It is manufactured at the same time in the hot rolling process for manufacturing the shape steel of the main member 1. The concave groove 12 is provided in the upper surface flat portion 11 by inclining the inclination angle θ from one side 13 to the other side 14 by about 30 degrees (FIG. 5). The concave grooves 12, 12, ... Are repeated at a constant pitch in a “C” shape so that a trapezoidal flat portion 11 having an upper bottom and a lower bottom alternately appearing. The concave groove 12 is formed in a V shape because a non-slip effect is obtained from each direction.

Here, the main member 1 having a thickness of 4.5 mm is used, the groove width is 3 mm, the trapezoidal upper base length of the flat portion 11 is about 4 mm, and the lower base length is about 18 mm.
Therefore, in a plan view (FIG. 2), any straight line L1 orthogonal to the main member 1 through the intersection a of the groove 12 and the one side 13 of the main member 1 is at the other side 14 point of the main member 1. It enters into the area of the flat portion 11. Further, any straight line L2 orthogonal to the main member 1 passing through the intersection b between the groove 12 and the other side 14 of the main member 1 is located in the region of the flat portion 11 at one side 13 of the main member 1. Get in. More specifically, the trapezoidal flat portion 1
When the orthogonal line L3 is drawn through the lower base corner c of 1, the lower base corner d of the adjoining inverted trapezoidal flat portion 11 is always in a state of getting over the orthogonal line L3 and entering.

In this embodiment, the depth of the concave groove 12 is about 2 mm, but the depth of the concave groove 12 is preferably in the range of 1 to 4 mm. More preferably, it is in the range of 1.5 to 3.0 mm. If the groove 12 is too shallow, the anti-slip effect will not be obtained and it will be 4 mm.
This is because there is not much difference in the anti-slip effect if it exceeds. Further, as described above, an example of using the main member 1 having a thickness of 4.5 mm is shown, but the main member 1 can be appropriately selected within the range of 3 to 7 mm.
The groove width of the concave groove 12 is preferably in the range of 3 to 6 mm, and the inclination angle θ is preferably in the range of 25 to 40 degrees. Groove 1 when the angle is less than 20 degrees
This is because 2 is inclined too much and the anti-slip effect is weakened. Also,
This is because if the angle exceeds 40 degrees, the width of the concave groove 12 must be reduced. In addition to the groove 12, it is preferable to provide a circular recess 15 in the center of the lower bottom of the trapezoidal upper flat portion 11 because slip prevention is further enhanced. (Fig. 6).

The connecting member 2 is a twisted rod formed by twisting a metal rod-shaped member of about 5 mm (FIG. 1). The connecting member 2 is the groove 1
After a plurality of main members 1 are erected with the flat portion 11 having 2 upwards, the main members 1 are placed on the upper surface of the main member orthogonally thereto and at regular intervals W. Then, the main member 1 and the connecting member 2 are fixed by electric pressure welding to assemble the grating-shaped grating A (FIG. 3).

Specifically, it is as follows. Main member 1
The connecting material 2 is placed in a grid pattern on the first side, a current is passed from one side to the other side, a large current is concentrated on the joint portion 4, and the joint portion 4 is heated using the Joule heat generated thereby as a heat source. The heating temperature is equal to or higher than the recrystallization temperature of carbon steel which is the material of the main member 1. Next, pressure is applied from above the connecting member 2 onto the surface of the main member 1. The connecting material 2 is embedded until it becomes substantially flush with the flat portion 11. By applying a large pressure, plastic deformation is caused to secure the pressure contact fixation. At the manufacturing stage,
A large-scale grating with a fixed length is produced, and then cut according to the purpose.

Reference numeral 3 indicates a side plate. The side surface of the grating cut into a predetermined size is reinforced. The main member 1 and the connecting member 2 are joined by welding. In this embodiment,
A side plate 3 made of flat steel is used.

(2) Second Embodiment Instead of the first embodiment, the upper portion of the main member 1 is formed in a taper shape of about 5 degrees (FIGS. 7 and 8). This is because the frontage of the groove 12 is increased to improve the non-slip effect. Other configurations are the same as those in the first embodiment. However, in this embodiment, the orthogonal line L4 to the main member 1 passing through the trapezoidal lower bottom vertex e
Is a configuration that passes through the lower bottom apex f of the adjacent flat portion 11,
It is in a limit state where it enters the region of the flat portion 11.

(3) Third Embodiment FIG. 9 is a plan view of the main member 1 according to this embodiment. Groove 1
2 shows a gentle S curve. By adopting such a configuration, the connecting member 2 does not fall into the concave groove 12 even if the concave groove 12 is made a little larger, which is a more preferable form than the first and second embodiments. Other configurations are the same as those in the first embodiment.

(4) Effects of the Embodiments In any of the metallic gratings having the above-described aspect, since a large number of recessed grooves 12 are formed in the flat upper surface portion 11 of the main member 1, the frictional resistance is increased and the recessed groove 12 portions are formed. It serves to prevent slipping. Also, metal grating A
In the manufacture of the above, the position of the concave groove 12 is inconsistent due to the manufacturing method, but even if it is inconsistent, the connecting member 2
Does not fall into the groove 12. That is, the main member 1
The orthogonal line L (L1 to L4) at any point in the throat includes the flat portion 11. The lower bottom corner c of the trapezoidal flat portion 11
When the connecting member 2 is detached from and is going to fall into the concave groove 12, the lower bottom corner portion d of the adjoining trapezoidal flat portion 11 blocks this, so that it does not fall into the concave groove 12. Therefore, the connecting member 2 is fixed to the main member 1 while maintaining the initial shape without being displaced or bent in the pitch interval during the electric pressure contact. As in the past, the connecting member 2 does not meander or fall into the concave groove 12 to cause undulations, and the finished product has a good appearance and is excellent in quality.

The present invention is not limited to those shown in the above-mentioned embodiment, but can be variously modified within the scope of the present invention depending on the purpose and application. In the above-mentioned embodiment, the concave groove 12 is formed in a V shape, but it may be aligned in the same direction. Further, although the main member 1 and the connecting member 2 are fixed by pressure welding by electric pressure welding, a gas pressure welding method or the like may be adopted. Further, it is not necessary to form the concave grooves 12 on the upper surfaces of all the main members 1, and the concave grooves 12 may be provided at a constant ratio of the main members 1.

[0019]

As described above, the metallic grating of the present invention is a product in which the connecting material is arranged in a linear manner while having the non-slip function by forming the concave groove in the flat portion of the upper surface of the main member. As it is finished, it looks good and has a great effect on quality improvement.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view of a main part of a metal grating used in a first embodiment.

FIG. 2 is a plan view of FIG.

FIG. 3 is a perspective view of a main member of the first embodiment.

FIG. 4 is a vertical sectional view of FIG.

FIG. 5 shows a plan view of FIG.

FIG. 6 is a plan view showing a main member of a different mode from the main member of the first embodiment.

FIG. 7 is a vertical sectional view of a main member according to a second embodiment.

FIG. 8 shows a plan view of FIG.

9 is a plan view showing a main member of Example 3. FIG.

FIG. 10 is a plan view of a conventional metal grating.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main member 11 Flat part 12 Recessed groove 13 One side 14 Other side 2 Connecting material a Intersection b Intersection A Grating

Claims (1)

[Claims] 1. A plurality of strip-plate-shaped main members are arranged in parallel with the width direction being up and down, and rod-shaped connecting members are placed on the main members so as to be orthogonal to each other in a lattice pattern. In a metal grating formed by press-contacting and fixing, a plurality of concave grooves obliquely inclined from one side to the other side are formed in a flat surface of an upper surface of the main member, and the concave groove and the main member are planarly viewed. A straight line that is orthogonal to the main member through the intersection with one side enters the flat portion region at the other side of the main member, and passes through the intersection between the groove and the other side of the main member. A metal grating configured such that a straight line perpendicular to the main member entirely enters the area of the flat portion at one side point of the main member.