JPH042329B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing a metal cylindrical support fitting used as a straight joint for connecting scaffolding pipes at a construction site, for example.

<Conventional technology> Conventionally, in order to manufacture a metal cylindrical support fitting, a long pipe material was first cut to a predetermined length, and then the pipe was mounted in a press mold to form holes and cutouts. was punched out. Furthermore, when the wall thickness of the pipe material is small, the force required for punching is small, so there was no problem with the strength of the mold.

<Problem to be solved by the invention> In recent years, the number of high-rise buildings has increased, and with this, scaffolds at construction sites are also required to have high strength.
In order to meet this level of strength, it has become necessary to increase the thickness of the supporting metal fittings. However, when attempting to manufacture cylindrical support fittings using thick pipe materials using conventional manufacturing methods, the force required for punching increases significantly, while the press mold for punching the pipe materials has a difficult time due to its structure. It is difficult to increase the upper strength, and the mold may be damaged due to insufficient strength.

<Means for Solving the Problems> The present invention has been proposed in view of the above, and includes a method of providing a method for providing at least one edge portion of a substantially rectangular flat plate made of metal, extending from the edge portion along the length direction of the flat plate. A notch consisting of a vertical cavity and a horizontal cavity extending along the width direction of the flat plate from the end of the vertical cavity, with the horizontal cavity of the notch extending in the same direction along the width direction of the flat plate. The flat plate is formed in two places at an interval of approximately half the width of the flat plate so as to extend to the width of the flat plate, and then the flat plate is bent with the length direction of the flat plate as the axial direction, so that both side edge portions along the length direction are close together. Alternatively, the cylindrical body is in contact with the cylindrical body, and the vertical hollow portions of both the notches are located on a straight line in the radial direction passing through the center of the cylindrical body.

<Function> If the material is punched out in the form of a flat plate, the structural strength of the punching die for flat plates can be easily increased, so even if the thickness of the material is increased, the die will not be damaged. When this flat plate is bent into a circular arc and plastically worked into a cylindrical body, it becomes a cylindrical support fitting with two notches opening on opposing circumferences.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

The support fittings shown in FIGS. 1 to 7 are used as linear joints for connecting scaffolding pipes at construction sites.

To manufacture this support fitting, as shown in Fig. 1, a substantially rectangular flat plate 1 made of metal (for example, made of SS41 with a thickness of 3.2 mm to 3.5 mm) is Flat plate 1 is placed at the end of the left and right side edges along the
Projections 2a and 2b are formed that slightly protrude in the width direction of the flat plate 1, and cutouts 3a, 3b, 3c, and 3d are formed at the upper and lower edge portions along the width direction of the flat plate 1 (left-right direction in FIG. 1).
are formed at two locations at an interval of approximately half the width of the flat plate 1.

The protrusions 2a and 2b described above can be formed by cutting off the left and right side edge portions into narrow widths from one end to the vicinity of the other end.

The one notch 3a described above is located on the flat plate 1.
a vertical cavity 4a that is open at one end at an upper edge portion and extends along the length direction of the flat plate 1;
The flat plate 1 has a substantially hook-shaped shape and includes a horizontal hollow portion 5a extending from the other end along the width direction of the flat plate 1. Further, the other notch 3b is also approximately hook-shaped having a vertical cavity 4b and a horizontal cavity 5b, but the vertical cavity 4b is connected to the other notch 3 described above so as to communicate with the cut-off part described above.
It is cut in the width direction more than the vertical hollow part 4a of a, and this extra cut part (hereinafter, this cut part is referred to as the hollow receiving part 6a) is large enough to accommodate the above-mentioned protrusion 2a. It is set to .

That is, the length and width of the cavity receiving portion 6a are set to be slightly larger than the length and width of the protruding piece 2a. Further, the horizontal hollow portions 5a, 5b of both the notches 3a, 3b extend in the same direction along the width direction of the flat plate 1.

Note that the notches 3c, 3d and the cavity receiving part 6b formed in the lower edge portion also fit into the notches 3a, 3.
b. It has the same structure as the cavity receiving part 6a, except that the direction of the horizontal cavity is different.

The above-mentioned shearing process of punching out each notch 3... and the receiving parts 6a and 6b, and cutting off the left and right side edges to form the protrusions 2a and 2b can be performed in one step using a large press machine. Although ranking may be performed, it is not necessarily necessary to perform the ranking at the same time, and cutting and punching can be performed using a mold adapted to the function and capacity of the press machine. For example, in the case of mass production using a large press machine, a long material or a hoop material can be progressively processed by feeding it to a mold that feeds a predetermined length.

After the above-described cutting and punching processes are completed, the flat plate 1 is then bent into an arc shape to form a cylindrical body.

In this bending process, the length direction of the flat plate 1 is taken as the axial direction, and as shown in FIG.
Bend the left and right parts into opposite arcs that protrude downward. Then, in the subsequent bending process, pressure is applied in the direction of the arrow in FIG. 3 to form a cylindrical body as shown in FIG. 4.

In this way, approximately the central part of the flat plate 1 is bent into an arc shape in the direction opposite to the final arc direction, and the left and right parts, especially the left and right side edge parts, are bent to a curvature close to that of the final cylindrical body. By placing it in place, it is possible to bend it into a cylindrical body with a cross-sectional shape close to a perfect circle. and,
When formed into a cylindrical body, the left and right side edge portions of the flat plate 1 having the projecting pieces 2a and 2b come into contact with each other in a opposed manner, with the projecting piece 2a being in the receiving cavity 6a and the protruding piece 2b being in the receiving cavity 6b. into each.

Therefore, when the flat plate 1 is formed into a cylindrical shape, it is possible to prevent the adjacent or abutting side edge portions from shifting in position, and both opening lines of the cylindrical body are positioned substantially parallel to each other. In addition, the effective width of the vertical cavities 4b, 4d of the notches 3b, 3d is different from that of the other notch 3a by the protruding piece 2a entering the cavity receiving part 6a and the protruding piece 2b entering the cavity receiving part 6b, respectively. , 3c, and the opening ends of the vertical cavities 4a, 4b of both notches 3a, 3b are located on a straight line in the radial direction passing through the center of the cylindrical body.

Vertical hollow parts 4c, 4d of lower notches 3c, 3d
Similarly, it is located on a straight line in the radial direction passing through the center of the cylindrical body.

Next, as shown in FIG. 5, the cylindrical body is inserted into a metal band member 7 having an inner diameter slightly larger than the diameter of the cylindrical body, and positioned approximately at the center of the length of the cylindrical body. Then, in this state, the outer surface of the band member 7 is locally pressed with a punch or the like and caulked. In this case, if the outer surface of the band member 7 is pressed with a punch at a position approximately 90 degrees out of phase from the seam where the side edge portions are close to or in contact with each other, the opening of the seam due to the spring back of the cylindrical body can be suppressed. As shown in FIG. 6, it is possible to manufacture a support fitting 8 having a substantially perfect circular cross section.

To connect a scaffolding pipe using the support fitting 8 manufactured in this way, as shown in FIG. 7, insert the lower half of the support fitting 8 into the upper end opening of the lower pipe 9a. , a pin 10a provided in the upper part of the pipe 9a in the diametrical direction is connected to the support fitting 8.
The support fitting 8 is lowered so that it enters the vertical hollow parts 4c and 4d on the lower side, and the pin 10a is inserted into the notch 3.
c, If it is deep enough in 3d, the support fitting 8
By rotating the pin 10a, the notch 3c,
3d in the horizontal spaces 5c and 5d.

In this way, the support fitting 8 is inserted into the lower pipe 9a.
When the pipe 9a is fitted, the upper end of the pipe 9a comes into contact with the lower surface of the band member 7 of the support fitting 8, and the pin 10a
are engaged with the edges of the horizontal hollow parts 5c, 5d of the notches 3c, 3d, so the support metal fitting 8 cannot move up and down any further and cannot be removed.

Next, the upper half of the support fitting 8 is inserted into the lower opening of the pipe 9b connected to the upper side, and the pin 10b provided at the lower part of the pipe 9b is inserted into the vertical opening of the upper notch 3a, 3b of the support fitting 8. Parts 4a, 4b
The pipe 9b is lowered so that the pin 10b enters the inside, and when it has descended sufficiently, the pipe 9b is rotated to move the pin 10b into the horizontal hollow parts 5a, 5 of the notches 3a, 3b.
position within b. When the pipe 9b is fitted in this way, the lower end of the pipe 9b comes into contact with the upper surface of the band member 7 of the support fitting 8, and the pin 10b touches the edge of the horizontal hollow parts 5a, 5b of the notches 3a, 3b. Since the pipe 9b is locked, the pipe 9b is firmly connected to the lower pipe 9a via the support fitting 8, and will not come off.

In the embodiment described above, the support fitting 8 is a linear joint that connects the pipes 9a and 9b, but the support fitting 8 that can be manufactured by the present invention is not limited to the above.

For example, other embodiments shown in FIGS. 8 to 13 connect and support a base plate 11 installed at the lower end of a scaffold and a pipe 9c.

In order to manufacture this support fitting 8', as shown in FIG. A projecting piece 2c that slightly protrudes in the width direction of the flat plate 1' is formed on the flat plate 1', and notches 3e and 3f are formed at one end edge portion along the width direction of the flat plate 1' (left and right direction in FIG. 8).
are formed at two locations at an interval of approximately half the width of the flat plate 1'.

The two cutout portions 3e and 3f described above are the vertical hollow portions 4e and 4f and the horizontal hollow portion 5, as in the embodiment described above.
It is approximately hook-shaped and consists of horizontal hollow parts 5e and 5f.
extend in the same direction along the width direction of the flat plate 1'. Note that one notch 3f is a vertical cavity 4f.
communicates with the cut-off portion described above, and the protruding piece 2
A cavity receiving portion 6c is formed that is large enough to accommodate the spacer c.

After the above-described cutting and punching processes are completed, the flat plate 1' is then bent into an arc shape to form a cylindrical body. In this bending process, as shown in FIGS. 9 to 11, as in the previous embodiment, the approximately central portion of the flat plate 1 was bent upward into an arc shape, and the left and right portions were bent downward in the opposite direction. It is bent into an arc shape and then formed into a cylindrical body. When formed into a cylindrical body in this way, the side edge portion having the protruding piece 2c approaches or abuts the other side edge portion in an opposing manner, and the protruding piece 2c enters into the receiving cavity 6c to prevent displacement. , and the vertical hollow parts 4e and 4f of both notches 3e and 3f are located on a straight line in the radial direction passing through the center of the cylindrical body.

When the lower end of the cylindrical body thus formed is fixed to the upper surface of the base plate 11 by means such as welding, the support fitting 8' connecting the base plate 11 and the pipe 9c is completed. When using this support fitting 8', as shown in FIG.
After engaging the pins 10c of c into the notches 3e, 3f of the support fitting 8' from above through the vertical hollow parts 4e, 4f,
Rotate the pipe 9c and insert the pin 10c into the notch 3.
e, 3f into the horizontal hollow parts 5e, 5f.

Note that the bending process in the present invention is not limited to the above-mentioned embodiments. For example, in the first step, punching is performed to form the protrusions 2, notches 3, etc. (Fig. 14), and in the second step, the left and right side edges of the flat plate are shaped into an arcuate shape almost to the final curvature. Perform the bending process to bend it (Fig. 15), and
In the process, the center of the flat plate is pressed almost to the final curvature and bent into a U-shape (Figure 16), and in the fourth process, the upper half of the U-shape is bent to form the final cylinder. good. By performing the bending process in such a process, even a thick plate can be processed into a nearly perfectly circular cylindrical body.

<Effects of the Invention> As explained above, according to the present invention, a thick flat plate is used as the material, and notches etc. are cut in the flat plate, so that a press die for punching the flat plate can be used. It can be used and processed. Since the press die for punching a flat plate has high structural strength, it will not be damaged even when processing a thick flat plate. Therefore, a supporting metal fitting with high strength can be efficiently manufactured.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a developed view of a flat plate with cutouts etc. cut out;
Figure 2 is a front view of the flat plate before bending, Figure 3 is a front view of the flat plate in the middle of bending, Figure 4 is a front view of the flat plate after bending has been completed, and Figure 5 is a front view of the flat plate after bending. A partially cutaway perspective view of the band member being fitted, FIG. 6 is a perspective view of the completed support fitting,
FIG. 7 is a front view showing how the support fitting shown in FIG. 6 is used, FIG. 8 is a plan view of another embodiment of the flat plate with cutouts etc. cut out, and FIGS.
The figures are front views showing the states in which the flat plate shown in Fig. 8 is bent, Fig. 12 is a perspective view of another embodiment of the support fitting in the completed state, and Fig. 13 is the use of the support fitting shown in Fig. 12. A front view showing the state, and FIGS. 14 to 17 are front views of each step in another embodiment of the bending process. 1 is a flat plate, 2 is a projecting piece, 3 is a notch, 4 is a vertical cavity, 5 is a horizontal cavity, 6 is a cavity receiving part, 7 is a band member,
8 is a support metal fitting, 9 is a pipe, 10 is a pin, and 11 is a base plate.

Claims (1)

[Claims] 1 At least one end edge of a metal substantially rectangular flat plate has a vertical cavity extending from the edge along the length direction of the flat plate, and a vertical cavity extending from the end of the vertical cavity along the width direction of the flat plate. A notch consisting of a horizontal cavity extending along the
The horizontal hollow parts of the notches are formed in two places at intervals of approximately half the width of the flat plate so that they extend in the same direction along the width direction of the flat plate, and then the flat plate is cut with the longitudinal direction of the flat plate as the axial direction. is bent to form a cylindrical body in which both side edge portions along the length direction are close to or in contact with each other, so that the vertical hollow portions of both the above notches are located on a straight line in the radial direction passing through the center of the cylindrical body. A method of manufacturing a support fitting characterized by: