JPH0121392B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tube formed by winding an elongated strip.

The use of plastic tubes for conveying water and other fluids is known, but when buried underground, the requirements for soil loading or pressure testing require a particularly large diameter and wall thickness. must be of considerable size, thus making such tubes expensive.

Another problem with tubing is that it is bulky for transportation, and until now such tubing has been formed from strips, i.e., by winding the strip into a spiral and connecting adjacent edges to form the tubing. was proposed. Such a system is disclosed in U.S. Pat. No. 3,938,558;
This deals with longitudinal corrugated metal strips with edges that can be connected adjacently.

It is also known to form flexible hoses from strips, which when the strip is wound into a spiral, one edge engages into the shape of the other edge to seal the hose and hold it upright. and a longitudinally shaped edge positioned to form a flexible member having a helical shape. However, the strip is relatively narrow in width.

It is also known to use somewhat wider strips made of synthetic material, which also have the ability to engage one edge into the socket of the other edge when the edges are placed adjacently. 3,606,670, as disclosed in US Pat. No. 3,606,670. This specification also discloses a machine for rotating the strip into a helical configuration and pressure bonding the edges.

The object of the present invention is to provide a tubular article formed by spirally winding an elongated strip and joining the edges as described above, which includes a rib formed on one edge of the strip and a rib formed on the other edge. The objective is to provide a tubular article whose connection part is reinforced.

According to the invention, at least one side of the strip is provided with a series of upright ribs 22 spaced apart across the width of the strip to form a series of parallel, longitudinally extending open grooves 6; Connecting ribs 22 each positioned along each edge
a and an engaging rib 22b are provided, and the connecting rib 22
a and the engaging ribs 22b engage and connect with each other when the strip is helically wound and one edge portion of the strip is laid over the other edge portion, thereby forming said strip into a helical shape. In the tubular body formed by winding the strip in a helical shape, which is adapted to be held, near the upper end of at least one upright rib 22 adjacent to the joint between the connecting rib 22a and the engaging rib 22b. A protruding portion extending toward the connecting portion is provided, the engaging rib 22b is provided with an extending portion 21a extending beyond the connecting portion, and a fixing member is provided between the protruding portion and the extending portion of the engaging rib 22b. 28,3
8 are fitted together, and the fixing members 28 and 38 include a first part that engages with the protrusion and a second part that engages with the extension 21a, and the movement of the connecting rib with respect to the engaging rib To provide a tubular article formed by winding an elongated strip, which is characterized in that the tube is restrained and the connecting portion is reinforced.

Referring to FIG. 1, the strip 21 includes a continuous upright rib 22, a rib 22a located at one edge of the strip and having a continuous barb thereon, referred to as a connecting rib, and a barbed socket. , and the rib 22a is shaped like the rib 22b.
and a rib 22b near the other edge of the strip, referred to as an engagement rib, aligned for engagement with the socket of the strip. The strip is helically wound and the edges are brought into engagement by pushing rib 22a into the socket of rib 22b to form a tubular object, such as a tube.

When the strip 21 is wound spirally, the engaging rib 2 forms a socket with the connecting rib 22a.
The mating connection with 2b is reinforced by positioning a channel-shaped locking member 28 over the engagement rib 22b, which locking member 28 fits over the connection of the two edges of the strip and connects the rib. 22 and the engaging rib 22b to fix the assembly together.
Preferably, the securing member 28 is made of strong polyvinyl chloride and not only secures the joint;
Provide sufficient reinforcement along the periphery of the strip.

A similar shape is shown in Figure 2, with strip 3
1 has ribs 32 standing upright from the strip, and these ribs 32 include barbed ribs 32a;
It includes an engaging rib 32b having a socket into which the rib 32a fits. In this case, however, the edge of the strip is such that a foam seal or fixing element 38, which serves to ensure its fixation, engages the protrusion of the rib 32 and the extension 31a of the rib 32b. I was twisted and pinned down. As shown, a wire 39 is provided between the inner periphery of the socket of the rib 32b and the upper end of the barbed rib 32a, and has the effect of reinforcing the connecting portion. It is clear that this wire 39 has the effect of reinforcing the connecting portion and also acts as a sealing member.

As described above, according to the present invention, the fixing member engages with the rib and the engaging rib at the fitting connection portion between the connecting rib and the engaging rib, and presses the engaging rib against the connecting rib, so that the fitting is achieved. The bonding strength of the mating joints is strengthened.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a tube with the joint between the two edges of the strip secured together by a securing member. FIG. 2 is a sectional view of a tubular article showing another example. 21, 31... Strip, 22, 32... Rib, 22a, 32a... Connection rib, 22b, 3
2b...Engagement rib, 28, 38...Fixing member.

Claims (1)

Claims: 1. A series of upright ribs 22 spaced apart across the width of the strip on at least one side of the strip.
a series of longitudinally extending parallel open grooves 6;
and a connecting rib 22a and an engaging rib 22b positioned respectively along each edge of the strip, the connecting rib 22a and the engaging rib 22b being arranged so that the strip is wound in a helical manner so that one side of the strip is closed. formed by helically wrapping said strips, said strips being adapted to engage and connect with each other when one edge portion is laid over another edge portion, thereby holding said strip in a helical configuration; In the tubular article, a protrusion extending toward the connecting portion is provided near the upper end of at least one upright rib 22 adjacent to the connecting portion between the connecting rib 22a and the engaging rib 22b, and the protruding portion extends toward the connecting portion. An extension part 21a extending beyond the connecting part is provided, and fixing members 28, 38 are provided between the protrusion part and the extension part of the engagement rib 22b.
The fixing members 28, 38 have a first portion that engages with the protrusion and a second portion that engages with the extension 21a, and prevent movement of the connecting rib with respect to the engaging rib. A tubular article formed by winding an elongated strip, characterized in that it restrains and reinforces the connection. 2. The tubular article according to claim 1, wherein the fixing member 38 has a rectangular cross section. 3 A horizontally protruding portion is formed at the upper end of the rib, and the fixing member 28 is connected to the first portion and the second portion.
2. The tubular article according to claim 1, wherein the tubular article has a W-shaped cross section consisting of a portion, and an end surface of the W-shaped cross section engages with a bottom surface of the corresponding protruding portion. 4 The connecting rib 22a and the engaging rib 22b each consist of a barbed rib and a socket forming rib, and a sealing member 39 is accommodated in the socket of the socket forming rib.
2. The tubular article according to claim 1, wherein the barbed rib is engaged with an end portion of the barbed rib.