JPS6140177B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a highly rigid helical tube formed by spirally winding a flexible band material.

2. Description of the Related Art Conventionally, a technique is known in which a long band made of a flexible material such as a synthetic resin is spirally wound to form a spiral tube having a desired diameter, particularly a medium-large diameter. For example, in Japanese Patent Publication No. 42-7112, one side edge of a flexible band is provided with a Y-shaped engaging part, and the other side edge is provided with an I-shaped engaging part, and the flexible band is arranged in a spiral shape. A technique for forming a helical tube by winding and engaging both side edges is described, and Japanese Utility Model Publication No. 45-4776 also describes a band material for a helical tube having a complicated female and male fitting part. There is.

However, in these conventional techniques, the inner surface of the assembled helical tube has a shape in which the fitting portion protrudes in a coil shape, and when used, for example, as a pipe for transporting sewage, liquid earth and sand, or other liquids. This has the disadvantage that the protrusion becomes an obstacle, reducing the transport capacity, and foreign matter gets caught, making perfect transport impossible.

The present invention eliminates the drawbacks of the prior art as described above,
Moreover, it was made to have the advantages of the conventional spiral pipe, and its gist is that both sides are erected on one side, and a concave and convex surface that butts and engages with the end face of the upright part. A flexible band member is provided with a wedge-shaped hook portion on the inside, and has an engaging portion that can form a fitting protrusion when the uneven surfaces butt and engage with each other. The tube is wound into a spiral tube shape, and a fitting convex line is formed on the outside of the tube, and the fitting concave line of the hard synthetic resin clip having the fitting concave line is fitted into the fitting convex line. The present invention relates to a helical tube characterized by being sandwiched together.

Next, one embodiment of the present invention will be described in detail with reference to the drawings.

In the drawing, reference numeral 1 denotes a band made of flexible hard synthetic resin with a thickness of approximately 1 to 1.5 mm, and as a whole is approximately U-shaped as shown in an enlarged view in Figure 3. The engaging portions 2 and 3 are provided with both side edges thereof standing upright on the same side so as to project. As shown in FIG. 2, the engaging parts 2 and 3 are formed with projections and depressions that can be engaged when they come into contact with each other, and in this abutted and engaged state, a fitting protrusion 4 is formed. At the same time, wedge-shaped hook portions 5 are formed on both left and right sides of the fitting protrusion 4.

Therefore, as shown in FIGS. 1 and 2, the strip material 1
While winding the tube into a spiral tube shape to form a spiral tube having a desired diameter D, the engaging portions 2 and 3 are engaged with each other, and a fitting protrusion 4 is formed on the outside of the tube. Reference numeral 6 is a clamping tool which has a substantially U-shape, and the tip portions on both sides are bent inward into a hook shape to form a hook-shaped hook portion 7, and the inside surrounded by the U-shape is a fitting groove. 8, the fitting concave line 8 of the clamping tool 6 is fitted into the fitting convex line 4, and the hook-shaped hook part 7 is latched to the wedge-shaped hook part 5, so that it is firmly clamped.

The flexible band material used in the present invention can be easily and continuously molded into a long piece from hard synthetic resin such as polyvinyl chloride, polypropylene, polyethylene, etc. by profile extrusion molding. In addition, only the surface of the engaging part is pre-coated with various soft synthetic resins to ensure airtightness.
It is also possible to improve watertightness, and in this case, a two-layer extrusion molding method may be employed.

In the present invention, as a means for winding the flexible band material into a spiral tube shape, it is sufficient to use a cylindrical core having a desired diameter and assemble it while winding it around the core, and the axis is perpendicular to the central axis of the tube. The larger the inclination angle of the spiral, the smaller the diameter, and conversely, the smaller the inclination angle, the larger the diameter of the tube.

In addition, in order to form a fitting protrusion on the outside of the pipe, the engaging portions formed on both side edges of the strip must protrude in the same direction at approximately right angles to the center of the strip, and the overall shape is approximately It must be U-shaped, and care should be taken when winding it so that this engaging part is located on the outside of the tube.

The spiral tube of the present invention has a high rigidity even if the tube wall is thin due to the fitting protrusion formed on the outside of the tube and the hard synthetic resin clip fitting fitted thereto, and
Since a fitting protrusion is formed on the outside of the pipe, when this is used as a pipe for transporting liquids, there is no particular protrusion on the inner surface of the transport pipe, and the pipe has excellent transport performance and is free from foreign matter. There is no need to repair or clean the pipes because they do not get stuck.

If the surface of the engaging part is coated in advance with a soft synthetic resin, the airtightness and watertightness of the engaging part will be further improved, and there will be no risk of water leakage.

Furthermore, since the spiral tube of the present invention is made by winding a long strip made of a flexible material in a spiral shape to form a spiral tube having a desired diameter, the strip and the clamping tool can be wound in a coil shape. Equi-helical tubes can be stored and transported in a fixed state, reducing inventory and transportation costs, and can be assembled on-site. Furthermore, when synthetic resin is used, mass production is possible. It also has the advantages of

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the spiral tube of the present invention, Fig. 2 is a partially cutaway sectional view showing an enlarged view of the above, and Fig. 3 is a sectional view showing the above band material taken out. FIG. 4 is a sectional view showing the above clamping tool. 1 is a band material, 2 and 3 are engaging parts, 4 is a fitting protrusion, 6
is a clamping tool, and 8 is a fitting groove.

Claims (1)

[Claims] 1 Both side edges are upright on the same side, each of which has an uneven surface that butts and engages with the end face of the upright portion and a wedge-shaped hook portion on the inner side, and a fitting convex with the uneven surfaces butt and engage with each other. A flexible band material having an engaging portion capable of forming a strip is wound into a spiral tube shape by butting and engaging both side edges to a desired diameter, and a fitting convex strip is formed on the outside of the tube. 1. A helical tube characterized in that the fitting concave line of a hard synthetic resin clamping device has a fitting concave line on a fitting convex line.