JPS6323672Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bellows-like flexible telescopic hose having a thin wall with a constant or almost constant wall thickness and a corrugated cross section.

This kind of bellows-shaped flexible telescopic hose is useful in that it has superior elasticity compared to a simple cylindrical hose, but the wall with a corrugated cross section to achieve this elasticity is difficult to handle when transporting fluids. There are disadvantages such as collision, which impedes fluidity and causes wear of the wall itself.

Conventionally, as a means to suppress such wall abrasion and decrease in fluidity, for example,
As shown in the publication, a membrane body is integrally installed between adjacent troughs of the waveform formed in the hose body,
A technique is known in which the membrane can be inserted into the protruding wall when contracted, but in this case, both ends of the membrane were integrally connected to each of the adjacent valleys, so the hose body It was supposed to reduce the degree of freedom of expansion, contraction and bending.

As a conventional technique for solving the drawbacks of the above-mentioned structure in which a membrane body is integrally joined to a wave-shaped case body, as shown in Japanese Utility Model Publication No. 51-29549, a continuous line with a semicircular arc cross section is used. One side edge of the spiral strip is fixed to the inside of the hose body having a curved waveform by adhering it to the smallest diameter part of the trough of the waveform, and the other side edge of the strip is a free end, and It is also known to have a structure in which a band-shaped body is bonded to another valley and overlapped on the inside.

This configuration is advantageous in that the flexibility of the hose is not significantly hindered because one end of the strip is a free end, but if the strips are not always superimposed on each other, The fluid to be transported enters the inside of the ridges, impeding the elasticity and flexibility of the hose body. Therefore, in order to ensure a sufficient amount of expansion and contraction of the hose body, it is necessary to overlap the strips. The mating allowance must be made sufficiently large.

However, if the overlapping margin is made sufficiently large, even though one side edge is a free end, the flexibility of the hose body will be hindered by the overlapping of the strips, and as a result, It has the disadvantage that it can only be used as a hose that does not require much expansion/contraction or bending.

The present invention attaches the above-mentioned band-like body to a hose body with a corrugated cross-section, so that the hose body can be sufficiently expanded and contracted in order to promote the fluidity of the fluid to be transported or to prevent wear of the hose body. Moreover, the purpose is to provide a flexible telescopic hose that has excellent flexibility and also has excellent strength against crushing in the radial direction of the hose body.

The characteristic structure of the present invention to achieve the above object is that a thin wall with a constant or almost constant wall thickness is shaped into a waveform with a U-shaped cross section, and the peaks and valleys of the waveform are formed. A bellows-shaped hose body is formed in which flat surfaces along the axial direction are connected along the radial direction by opposing wall portions, and this bellows-like hose body is moved in the axial direction by moving the opposing wall portions toward and away from each other. The inner surface of the bellows-shaped hose body has a ridge and a trough, the length between both sides of the hose body in the axial direction being longer than the axial length of one flat surface of the ridge. A U-shaped space consisting of a flat surface of one peak and opposing wall portions on both sides is created by forming a flat band whose length is shorter than the sum of the axial lengths of both flat surfaces. Furthermore, one side edge of this band-like body is positioned so as to close the open side of the band-like body, and one side edge of the band-like body is positioned close to the U-shaped space closed by the band-like body among the flat surfaces of the valley. The point is that each strip is fixed to the side part with the other side edge of the strip as a free end, and in a state where each strip can be polymerized inwardly and outwardly when contracted, and from this structure, the following effects are achieved. play.

That is, a flat surface along the axial direction is formed in the trough of the bellows-shaped hose body, and the length between both side edges of the belt-shaped body is set as described above, and
One side edge of the strip is fixed to one end of the flat surface near the U-shaped space to be closed, and the other side edge is a free end.
Even if adjacent strips do not overlap each other, the flat surfaces of the valleys can prevent the fluid to be transported from entering the U-shaped space. As shown in the figure, it is possible to expand and contract the bellows-like hose body without taking a large amount of overlap between the strips (they do not overlap unless they are contracted), and this large overlap between the strips increases the flexibility of the hose body. will not be hindered.

In addition, since the bellows-shaped hose body is shaped into a waveform with a U-shaped cross section, it is easy to bend at the connection between the flat surfaces of the peaks and valleys and the opposing wall that connects them. It has a structure,
In other words, compared to conventional structures such as curved waveforms with continuous semicircular arcs, the structure has multiple bending points, making the entire waveform easier to bend. Therefore, even when the above-mentioned large amount of expansion and contraction is ensured, there is no large overlap between the strips and the flexibility is not hindered, and this also increases the elasticity and bendability. A flexible telescopic hose with excellent flexibility can be obtained.

Furthermore, in addition to the above-mentioned effects, the fact that the bellows-shaped hose body is shaped to have a U-shaped cross section as described above has the advantage that the cross section has a radial Due to the presence of a long opposing wall section along the wall, the moment of inertia of area is significantly increased despite the thin wall thickness, making it possible to resist radial crushing without sacrificing good elasticity or flexibility. It is also advantageous in that it can provide strong strength.

Embodiments of the present invention will be described below with reference to the drawings.

The flexible telescopic hose of the present invention can be conveniently applied to places where the hose is installed in a bent position, such as highway drainage pipes, and has a thin wall 1 with a constant or almost constant wall thickness. The waveform has a U-shaped cross section, and the peaks and troughs of the waveform both have flat surfaces 1A and 1B along the axial direction, and an opposing wall portion 1a is provided between each of the flat surfaces 1A, 1B. , 1a..., and the bellows-shaped hose main body 2 is configured to be expandable and retractable by moving the opposing wall portions 1a, 1a... toward and away from each other in the axial direction.

On the inner surface side of the bellows-shaped hose body 2, the length between both side edges in the axial direction of the hose is longer than the axial length of one flat surface 1A of the crest of the waveform,
A flat band-shaped body 3 having a length shorter than the sum of the axial lengths of both the flat surfaces 1A and 1B of the peak and valley parts,
The band-shaped body 3 is attached so as to close the open side of the U-shaped space formed by the flat surface 1A of one mountain portion and the opposing wall portions 1a, 1a on both sides thereof. That is, one side edge of the strip 3 is attached to one end of the flat surface 1B of the valley portion on the side closer to the U-shaped space to be covered by the strip 3, and the flat surface of the peak portion is A strip 3 longer than 1A is positioned so as to cover the open side of the U-shaped space, and
The other side edge of the strip 3 is a free end, and is configured so that when the bellows-shaped hose body 2 is contracted, the strips 3 overlap each other inwardly and outwardly. When contracted by applying an external force in the axial direction, the strips 3 will overlap and the flexibility of the hose body will be hindered. etc., so there is no problem.

To describe the preferred structure and means for implementing the above-mentioned flexible telescopic hose, the bellows-shaped hose body 2 and the band-shaped body 3 are both made of synthetic resin, and are also made of the same material (polypropylene is most suitable). In this case, a semi-molten belt is extruded into a U-shape, wound spirally around a core shaft, and adjacent edges are welded together to form a bellows-shaped material with a corrugated wall 1. Efficient means can be taken, such as forming the hose body 2 and welding the latter flat strip to one end of the flat surface 1B of the trough of the bellows-shaped hose body 2.
In addition to this, when the two belt-shaped materials, which are flexible even when cured, are wound twice as described above, they may be fixed together by heat welding or adhesive application.

Moreover, other than forming the bellows-shaped hose body 2 so that a large number of peaks and valleys form a series of spirals,
The peaks and troughs may be formed into independent annular shapes; in this case, each strip 3
The hoses are formed by applying adhesive to one end of the outer periphery of each of the annular strips 3 arranged in parallel, and then butting and joining the halves of the bellows-shaped hose body 2 to form a hose. This is what you get.

The band-like body 3 is preferably made of synthetic resin, resin-impregnated cloth, ultra-thin metal plate, or other material having high abrasion resistance.

[Brief explanation of drawings]

The drawings show an embodiment of the flexible telescoping hose according to the present invention; FIG. 1 is a longitudinal front view, FIG. 2 is a partially longitudinal front view in an expanded state, and FIG. 3 is a partially longitudinal front view in a contracted state. 4 and 5 are partially cutaway front views of application examples, respectively. 1...Corrugated wall, 1A, 1B...Flat surface, 1a...
...Opposite wall portion, 2...Accordion-like hose body, 3...
zonal body.

Claims (1)

[Claims for Utility Model Registration] A thin wall 1 with a constant or almost constant wall thickness is shaped into a U-shaped waveform in cross section, and along the axial direction formed at the peaks and valleys of the waveform. flat surface 1
A and 1B form a bellows-shaped hose main body 2 in a shape in which they are connected by opposing wall portions 1a and 1a along the radial direction, and this bellows-like hose main body 2 is moved near and far between the opposing wall portions 1a and 1a. The bellows-shaped hose main body 2 is configured to be expandable and contractible in the axial direction, and has a ridge portion on the inner surface of the bellows-shaped hose body 2, the length between both sides of the hose body 2 in the axial direction being longer than the axial length of one flat surface 1A of the ridge portion. and a flat strip 3 shorter than the sum of the axial lengths of both flat surfaces 1A and 1B of the valley, by the strip 3,
It is positioned so as to close the open side of the U-shaped space formed by the flat surface 1A of one mountain part and the opposing wall portions 1a, 1a on both sides thereof, and furthermore, one side edge of this band-shaped body 3 is Flat surface 1B of the valley
At one end of the strip 3 on the side closer to the U-shaped space closed by the strip 3, the other side edge of the strip 3 is a free end, and when contracted, each A flexible elastic hose characterized in that a band-shaped body 3 is fixed to the inside and outside in a polymerizable state. The flexible telescopic hose according to claim 1, wherein the band-shaped body 3 is made of a material with excellent abrasion resistance. The bellows-shaped hose main body 2 and the band-shaped body 3 are:
The flexible telescopic hose according to claim 1 or 2, which is made of synthetic resin, respectively.