JPS5820686B2 - How to make a lattice - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method for manufacturing a lattice body that can be applied to fences, grids, gates, etc. In particular, the lattice body is formed by fixing a metal center shaft to a metal frame frame. In doing so, it is possible to omit welding, eliminate defects caused by the welding method, and mass-produce highly durable lattice bodies at low cost.

In the past, most of these types of lattice bodies were assembled by welding and finished with paint, so the welded parts were built up irregularly, which not only spoiled the original structure, but also made it widely used in recent years. In the case of galvanized steel pipes, the galvanized layer on the surface disappears due to the heat during welding, and the adhesion of the surface coating film decreases due to thermal embrittlement of the welded portion, causing rust to occur in a short period of time.

On the other hand, in the case of a lattice body in which the frame frame and center shaft are assembled using screws, rivets, etc., it is necessary to use expensive non-corrosive materials such as stainless steel for these fastening fittings, and even in this case, the parts where different materials come into contact are Defects that cause rust due to electrolytic corrosion have been pointed out.

Recently, in order to compensate for such defects, a welding-free method has been developed that uses a jig to widen the pipe end of the center shaft that fits into the through hole of the frame frame, but the manufacturing process is complicated and requires a large amount of equipment cost. Therefore, it cannot be said that the situation is satisfactory.

Based on these circumstances, the inventor of the present invention conducted various tests and made repeated studies, and as a result, a through hole was bored in the pipe-shaped frame crosspiece, and a square pipe-shaped center shaft was inserted into the through hole of the frame crosspiece. When fixing, cut both opposing inner sides of the long side or equivalent side of the square pipe-shaped central shaft at the position where it fits into the through hole into a thin shape,
The desired purpose is achieved by fitting the center shaft into the through hole of the frame crosspiece and pressing it in the axial direction, buckling the thin-walled portion of the center shaft and engaging the resulting outer protrusion with the through hole of the frame crosspiece. This has been achieved.

What should be noted in the method of the present invention is that the long side of the square pipe-shaped center shaft or, in the case of a square cross-section, the opposite inner sides of one side are cut into thin shapes, and this is pressed in the axial direction. Then, the thin-walled portion bulges outward and the outer protrusion can be engaged with the through hole of the frame crosspiece.In this case, by providing the thin-walled portion inside the long side or equal side of the center shaft, This significantly reduces the load required for buckling the center shaft.

In carrying out the method of the present invention, in order to form a thin-walled portion by cutting a predetermined position of the square pipe-shaped center shaft from the inner surface, for example, as shown in FIG. 11, the center shafts 3, 3... This can be done relatively easily by inserting a guide jig 6 inside the hole and cutting with a drill 7 or a press.

In carrying out the present invention, the thin-walled part of the square pipe-shaped center shaft is provided at a position approximately 1 to 3 ig inward from the through hole of the frame crosspiece, so that when the center shaft buckles, the plastically deformed part passes through. In order to contact the inner circumferential surface of the hole, the width to be cut should vary depending on the thickness of the hole, but is usually about 1 to 20 m.
The depth to be cut should vary depending on the wall thickness of the center shaft; for example, if the wall thickness is 1.0 to 1.2 m, the cutting depth should be 0.2 to 1.2 m.
About 0.6 mm is sufficient.

When cutting the inner surface of the center shaft, two thin-walled parts are placed close to the inner surface of the center shaft so that when the center shaft buckles, the plastically deformed portion comes into contact with both the inner and outer surfaces of the hole. You may do so.

Furthermore, in the present invention, the thin-walled cutting portion of the square pipe-shaped center shaft can be provided inside the other sides in addition to the long side of the center shaft. Although it is most suitable for a lattice body in which a through hole is drilled and a center shaft is fitted into the hole, it can also be applied to a lattice body in which a through hole is bored on both sides of the crosspiece and a center shaft is inserted through it. be able to.

The following will be explained in detail with reference to the drawings in Figures 1 to 4.
The lattice body shown in the figure has through holes 2, 2, . When it is inserted and fixed, the solid side of the long side of the part that fits into the through hole position of the square pipe-shaped center shafts 3, 3 is cut to form thin-walled parts 4, 4, and the center shafts are fixed. 3, 3...... through hole 2, 2... of frame crosspiece 1゜1
... and press it in the axial direction, and the thin-walled part 4 of the center shaft,
4 are buckled to form outer protrusions 5, 5, and these outer protrusions 5, 5 are inserted into the through holes 2, 2 of the frame crosspiece 1.1.
The center shafts 3, 3, . . . are integrally fixed to the frame bars 1, 1 by engaging with them.

In the examples shown in FIGS. 5 to 7, the pipe-shaped frame beams 1,
Through-holes 2, 2... are bored on both sides of the square pipe-shaped center shaft 3, 3..., and two strips are formed on the inside of the long sides at the positions that fit into the through-holes of the square pipe-shaped center shafts 3, 3... forming thin-walled portions 4, 4;
The center shafts 3, 3... are pushed in the axial direction while penetrating the frame crosspieces 1, 1, and the thin-walled portions 4 of the center shafts 3, 3...
, 4 are buckled to form outward protrusions 5, 5, . . ., which engage with the through holes 2, 2, . .

FIGS. 9 and 10 show through holes 2, 2, . , 3... are inserted and fixed.

According to the method of the present invention, the frame beams 1, 1 and the square pipe-shaped center shaft 3,
3 Omit welding in the grid body using...
In addition, the frame bars 1, 1 and the center shafts 3, 3, . ．３・・・・・・
・It is possible to assemble the lattice body with the anti-rust coating, plating, etc. on the surface completely protected, and its durability can be significantly increased.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a lattice body made by the method of the present invention, FIG. 2 is an enlarged cross-sectional view of essential parts during temporary assembly showing an example of the method of the present invention, and FIG. 3 is a line A--A in FIG. 4 is an enlarged sectional view of the main part after assembly, FIG. 5 is an enlarged sectional view of the main part during temporary assembly showing another example of the method of the present invention, and FIG. 6 is a cross-sectional view of the main part in FIG. 7 is an enlarged sectional view of the main part after assembly, FIG. 8 is an enlarged sectional view of the main part during temporary assembly showing another example of the method of the present invention, and FIG. 9 is an enlarged sectional view of the main part after assembly.
10 is an enlarged sectional view of the main parts after assembly. In the figure, 1 is a frame crosspiece, 2 is a through hole, 3 is a center shaft, 4 is a thin-walled part, and 5 is an outer part. 6 is a guide jig,
7 represents a drill.

Claims (1)

[Claims] 1. When drilling a through hole in a pipe-shaped frame crosspiece and inserting and fixing a square pipe-shaped central shaft into the through-hole of the frame crosspiece, the long side or Cut the opposite inner sides of the same sides into thin pieces, fit the center shaft into the through hole of the frame crosspiece and press it in the axial direction, and buckle the thin-walled part of the center shaft to form an outer protrusion. A method for manufacturing a lattice body characterized by engaging with holes in a frame crosspiece.