JPH0139851B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a hinge made from a metal tube material by embossing.

Conventional hinges are manufactured by bending the flat plate part around one end of the blade member, connecting the shaft tube integrally, and connecting the pair of blade members so that they can swing freely with a shaft fitted to the shaft tube. It had been.

However, this hinge has a seam at the edge that wraps around the shaft tube, where the most external force is applied.For example, in the case of a heavy, luxuriously patterned metal entrance door, the load is concentrated on the shaft tube, causing the shaft tube to leak through the seam. There were times when the door would spread out and become misaligned, causing the door to hit the door frame and not close smoothly.

For this reason, if a thick metal plate material is used to make a strong hinge, the bending process to make the shaft tube is difficult and the cost is high.

In addition, since the shaft tube of this conventional hinge is made by bending a flat plate, it is difficult to obtain the correct axis of the shaft tube and it is difficult to make each part into a perfect circle.

An object of the present invention is to solve the above-mentioned problems.

That is, this invention uses a metal tube of a required thickness as a raw material, transforms this metal tube into a flat cylinder with a substantially elliptical cross section by stamping, and then inserts a circular core material in the center corresponding to the shaft tube to be made. Used as a mold, a shaft tube is formed on one end edge, a double plate-like blade is formed on the other end connected to this, a plurality of screw holes are drilled in this blade to form a blade member, and a pair of This is a method of manufacturing a hinge, in which the wing member is swingably connected to a shaft fitted to a shaft tube.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the method for manufacturing a hinge of the present invention, as shown in FIG. 1, a steel pipe 1 having a required diameter is used as a raw material, and as shown in FIGS. 2 and 3, this steel pipe 1 is subjected to embossing. Thus, while transforming the cylinder 2 into a flat cylinder 2 having a substantially elliptical cross section, a cylindrical core material 3 having an outer diameter corresponding to the shaft tube 4 (see Fig. 5) to be made is used as a medium mold and inside this cylinder 2. As shown in FIG. As shown in FIG. 5, the inner mold is removed and a plurality of countersunk screw holes 6 are bored in the blade portion 5 to manufacture the blade member 7.

As shown in FIG. 6, the hinge uses a pair of blade members 7 manufactured as described above, the upper half is fitted into the shaft tube 4 of one blade member 7, and the upper half is fitted into the shaft tube 4 of the other blade member 7. The lower half of the shaft tube 4 is fitted to connect the two blade members 7 with the flanged shaft 8, and the cap 9 is press-fitted into the open end of the shaft tube 4 to complete the process. In addition, the flanged shaft 8
A flange 10 protrudes from the center, and both blade members 7 come into contact with each other via this flange 10.

In the hinge, the shaft tube 4 is made by stamping a metal tube, and it is easier to process than the conventional product, which is made by winding the shaft tube 4 from a flat plate by bending. The shaft center is easy to protrude, each part can be easily made into a perfect circle, and since there is no seam in the shaft tube 4, it has a large stress in the lateral outward direction during use.

The method for manufacturing a hinge of the present invention can be applied to a flag hinge in which a pair of shaft tubes abut each other vertically as described above;
It can also be applied to interlocking hinges in which a pair of shaft tubes engage from the left and right sides.

The method for manufacturing a hinge according to the present invention has the above-described configuration. According to this manufacturing method, the axial tube with a circular cross section is stamped from a metal tube with a circular cross section, although the curvature is different, so that the axial tube It is easy to achieve roundness, and it is easy to form the shaft tube. Furthermore, since there is no seam in the shaft tube and the blade part is double plate-shaped, the thickness of the material used can be made thinner than in conventional products, making it economical and easy to stamp.

In addition, hinges made using this manufacturing method have no seams in the shaft tube, so they do not open due to external forces during use, unlike conventional products, and have excellent durability. Since each part is perfectly circular, the door always opens and closes smoothly.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the material used in this invention;
Figures 2, 3, 4, and 5 are explanatory diagrams of the processing steps for manufacturing a wing member from the same material as above, and Figure 6 is a perspective view of an embodiment of a hinge manufactured by the present invention. It is a diagram. 1...Material, 3...Core material, 4...Shaft tube, 5...
Blade portion, 7...Blade member, 8...Shaft, 9...Cap.

Claims (1)

[Claims] 1 A metal tube of the required thickness is used as a material, and while this metal tube is transformed into a flat cylinder with a substantially elliptical cross section through embossing, a circular core material corresponding to the shaft tube to be made is used as the middle mold. , forming an axial tube on one end edge and forming a double plate-like blade part on the other end connected to this, and forming a blade member by drilling a plurality of screw holes in this blade part, and forming a pair of said blade members. A method for manufacturing a hinge that is swingably connected by a shaft fitted into a shaft tube.