JP3260128B2 - Grating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the grating of a metal grid used for laying above drainage drains or collecting ditches or as a passage plate in factories or the like.

[0002]

2. Description of the Related Art A grating 15 made of a metal lattice is widely used (see FIG. 5), and since it is required to have a strong mechanical strength to withstand a vehicle load or the like passing over the laid upper surface, the load is supported. A main member “bearing bars 2 arranged side by side at a fine pitch with the band width direction of the band material being vertical”; side plates 4 fixed to both side ends of the bearing bars 2;
This is a basic form of a rectangular lattice body including a connection bar 3 disposed orthogonally to the bearing bar 2 at an intermediate portion of the bearing bar 2.

[0003]

The above-mentioned conventional grating 15 has a structure in which the bearing bar 2, side plate 4, and connecting bar 3 of the constituent members are welded and fixed to one another, so that the number of welded portions at the time of molding is extremely large. In addition, a special strength is indispensable for welding and fixing the bearing bar 2 and the side plate 4 of the load bearing main member. Therefore, the welding process requires a lot of man-hours and time, resulting in high cost, and also requires special strength control and process control to secure the above-mentioned special welding strength, thus complicating the molding control. Is inevitable.

[0004] The present invention provides a grating that solves the above-mentioned difficulties of the prior art.

[0005]

According to the present invention, which solves the above technical problem, there is provided a grating in which a bar is juxtaposed in a rectangular frame and a hook is protruded from an end of the bearing bar. An inner side plate which is provided with a hook hole for receiving and locking the hook piece at a juxtaposed pitch of the bearing bars, and which is attached to and combined with an end of the juxtaposed bearing bar; An outer cover for covering and setting the inner side plate in the assembled state,
The inner side plate and the outer cover constitute a side frame portion of the bearing bar group. "

That is, in the grating according to the present invention, the both sides of the bearing bar 2 in the conventional structure and the welding and fixing structure of the side plate 4 are combined by the above-mentioned inner side plate, outer cover and bearing bar. It features a structure that makes it possible to omit the conventional welding process.
The bearing bars are orthogonally combined and connected to the single inner side plate by inserting and locking the hook holes in the slit grooves.

[0007] The outer cover of the above-mentioned constitutional requirements is that "a continuous coupling opening is provided on one surface of a rectangular tube body, and a flange at the edge of the opening is combined with a clearance between an end surface of a bearing bar and an inner side plate in a coupled state. To form a sheath body that is press-fitted to and set in a covering manner ”.

[0008]

According to the grating of the present invention having the above-described structure, the hooks of the bearing bar are locked in the hook holes of the inner side plate so that the bearing bars are aligned and maintained in an aligned state, and the inner side plate is covered with the outer cover. Since the outer cover is attached to the inner side plate at the press-fitting accuracy, the combination of the three members does not cause "chatter / deformation" in the normal use state of grating. It functions as an integral part and can secure sufficient mechanical strength, which is required as a bearing bar supporting frame for grating.

Since the main part of the metal rectangular frame can be constituted by the combination of the three members, the conventional welding process requiring special welding strength and process control is not required.

[0010]

Embodiments of the present invention will be described below. First, referring to FIGS. 1 to 3 showing the grating 1 according to the first embodiment of the present invention, a fine pitch P which supports the load of passing vehicles and pedestrians in a rectangular frame by setting the band width direction of the band material to the vertical direction. The grating 1 of this embodiment is used for the grating of a square lattice body having the bearing bar 2 "arranged side by side as a main part.
The side frame portions 5A and 5B on both sides of the bearing bar 2 are inserted into the "bearing bar 2 having the hook 6" and "the hook 6 is inserted into the hook hole 7 so as to be vertically attached to the side end of the bearing bar 3. And an inner cover 8 that accommodates the inner side plate 8 set at the side end of the bearing bar 2 in a hollow portion. The side frame portions 5A and 5B The welding and fixing of the bearing bar and the second group are unnecessary.

More specifically (see FIGS. 2 and 3), L-shaped hooks 6 are formed on both ends of the bearing bar 2 having a height H by slightly extending the strip and making cuts from the upper edge. It protrudes integrally. And the inner side plate 8 is the bearing bar 2
A strip-shaped ridge 11 continuous in the longitudinal direction of the strip at the center of the strip having a width B substantially equal to the height H of the strip.
At the center portion in the width direction, “a hook hole 7 that forms an ellipse in the width direction” has a shape formed at the same pitch P as the juxtaposed pitch of the bearing bars 2.

When the hook 6 of the bearing bar 2 is inserted into the hook hole 7 of the inner side plate 8 and the inner side plate 8 is attached to the side end of the bearing bar 2 and set (FIG. 3A).
The bearing bars 2 are arranged in parallel along the band-shaped ridges 11 of the inner side plate 8, are prevented from coming off by the engagement of the hook pieces 6 and the hook holes 7, are combined and connected, and the end face of the bearing bar 2 is connected to the inner face. The clearance C corresponding to the height h of the band-shaped ridge 11 is formed between the plate surfaces of the side plates 8.

On the other hand, the outer cover 9 has a sheath shape formed of a hollow tubular body having a rectangular cross section having a long side W corresponding to the height H of the bearing bar 2, and is formed at the center of one side plate on the long side. This structure has a structure in which a portion is continuous in the longitudinal direction of the tubular body, and a connection opening 12 is provided in which opposing edges form a pair of flanges 13.
By inserting the group into the above-mentioned clearance C "generated when the group is combined and set on the inner side plate 8, the inner side plate 8 can be enclosed and held in the hollow portion 14.

Then, an inner side plate 8 and an outer cover 9 having a length corresponding to the length L of the grating 1 are prepared in advance, and the inner side plate 8 and two groups of bearing bars are combined and locked. The flange 13 of the outer cover 9 is pressed into the clearance C between the inner side plate 8 and the end face of the bearing bar 2 in the combined state by "pressing with a hydraulic cylinder" or the like, so that the inner side plate 8 is attached to the outer cover. The inner side plate 8 and the outer cover 9 form the side frame portions 5A and 5B of the bearing bar 2 group "formed without welding" by being housed in the hollow portion 14 and fixed. .

The grating 1 of this embodiment is designed so that the combined "bearing bar 2 group, inner side plate 8 and outer cover 9" sufficiently withstand the vehicle load and the like to prevent "chattering". The clearance C and the flange portion 13 are press-fitted and statically fitted to each other, and a relative dimension for firmly fitting and coupling is adopted.

The grating 1 of this embodiment is provided with a reinforcing connection bar 3 for a bearing bar 2 having a juxtaposed posture similar to the conventional structure, and has front and rear frame plates 10 forming front and rear end frames of the grating 1 facing each other. Outer cover 9
And the front and rear frame plates 10 and the side frame portions 5A and 5B constitute a rectangular frame portion. And
The connection bar 3 and the front and rear frame plates 10 are fixed to each other by "point welding welding means or screw fixing means" or the like.

The inner side plate 8 of this embodiment has a flange-shaped bottom plate 16 on the lower side to improve the fixability when combined with the outer cover 9 and the hook hole 7 is slightly narrowed downward. By making the tapered hole and pressing down the inserted hook piece 6 downward, the fitting connection can be made firmly.

In the above-described grating 1 of the embodiment shown in FIG. 1, the hook 6 of the bearing bar 2 is locked to the hook hole 7 of the inner side plate 8 and combined, and the combined inner side plate 8 is connected to the outer cover 9 of the sheath. The side frame portions 5A and 5B are press-fitted and fixedly set in the side frame portions 5A and 5B.
Is mechanically and firmly fixed at both ends, withstands a vehicle load or the like passing through the upper surface and has no danger of "rattle". In addition, the conventional three-member fixed structure has a complicated structure. Eliminating the welding process improves the forming productivity of the grating and promotes cost reduction.

Next, another embodiment of the present invention will be described with reference to FIG. That is, in the case where the side frame portions 5A and 5B are formed by a combination fixing structure of the above three members, the hook 6 of the bearing bar 2 is formed in a downward L-shape, and the hook 6 The hook hole 7 of the inner side plate 8 for receiving the groove has a slot shape cut out from the upper edge in a groove shape. FIG. 4A shows a hook 6 from above the hook hole 7.
Can be combined, so that it is easy to combine the second group of bearing bars and the inner side plate 8.

On the other hand, in FIG. 4B, the hook 6 is formed in a T-shape composed of an "upper hook 6A and a lower hook 6B", and the hook holes 7 of the inner side plate 8 are formed in the band-like ridges 11. This long hook hole 7 has a T-shaped hook piece 6
The upper and lower hooks 6A and 6B are joined to the flat plate portion of the inner side plate 8 (the portion where the band-shaped ridge 11 does not exist) by slightly tilting and then lowering slightly.
The belt-like ridge 11 is sandwiched and fixed between the end surface of the bearing bar 2 and the upper and lower hooks 6A and 6B. In FIG. 4B, since the combined posture of the inner side plate 8 and the bearing bar 2 group is fixed, the outer case 9 can be easily inserted and covered.

The grating according to the present invention is not limited to the above-described embodiment. For example, the inner side plate 8 may have a shape without the bottom plate 16 or may have a "flat shape without the band-shaped ridge 11". In combination with the bearing bar 2, a separate spacer instead of the band-shaped protruding portion 11 may be inserted between the inner side plate 8 and the end surface of the bearing bar 2 to form the above-described clearance C or the like. In some cases, the outer cover 9 is set so as to be covered from above (or above and below) the inner side plate 8 to which the bearing bar 2 is connected, and to be fixed by "screwing and spot welding as necessary". . As the bearing bar 2, a T-bar, which is a mainstream made of a known grating, is naturally used.

[0022]

As described above, in the grating of the present invention, since the welding process of the bearing bar group and the side frame portion, which require special welding strength and process control, becomes unnecessary, the formability of the grating is particularly low. And has a useful effect of promoting a reduction in molding cost and simplification of the molding process.

[Brief description of the drawings]

FIG. 1 shows a grating according to a first embodiment of the present invention;
(A) is a perspective view thereof, and (B) is an enlarged sectional view of a side frame portion of (A).

FIG. 2 is a perspective view of major components of the grating of FIG. 1 embodiment.

3A and 3B show an assembled state of the grating of the embodiment of FIG. 1, wherein FIG. 3A is a sectional view of a combined state of the bearing bar and the inner side plate, and FIG.

FIG. 4 shows another embodiment of the grating of the present invention;
(A) and (B) are cross-sectional views of the side frame portions.

FIG. 5 is a perspective view of a conventional grating.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grating of this invention 2 Bearing bar 3 Connection bar 4 Side bar 5A / 5B side frame part 6 Hook piece 7 Hook hole 8 Inner side plate 9 Outer cover 10 Front and rear frame plate 11 Band-shaped ridge 12 Connection opening 13 Flange part 14 Hollow part 15 Conventional grating C clearance

Claims (2)

(57) [Claims] In the grating of a lattice body in which bearing bars are juxtaposed in a rectangular frame, hooks are protruded from ends of the bearing bars, and hook holes for inserting the hooks and locking the hooks are provided. An inner side plate that is bored at the pitch of the bearing bars and is attached to and coupled to an end of the bearing bar that is arranged side by side, and an outer cover that is set to cover the inner side plate in the attached combination state. A grating characterized in that the inner side plate and the outer cover constitute a side frame of the bearing bar group. 2. The outer cover is formed as a sheath of a tubular body having a rectangular cross section, and is opened continuously on one surface of the tubular body in the longitudinal direction of the tubular body.
And, it is formed by providing a connection opening having an opening edge as a flange, and press-fits the flange to a clearance between an end surface of a bearing bar group and an inner side plate combined and connected to the bearing bar group, and covers the flange. The grating according to claim 1, wherein the grating has a set structure.