Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
EXTENDIBLE PIPE FOR IRRIGATION
Document Type and Number:
WIPO Patent Application WO/2018/178778
Kind Code:
A1
Abstract:
An extendible pipe comprising: an outer pipe (2); an inner elastic pipe (3), inserted into the outer pipe (2) and connected thereto at two opposite end zones. The outer pipe (2) is longitudinally extendible in an elastic way between a minimum length and a maximum length.

Inventors:
RIGHI CESARE MATTIA (IT)
Application Number:
PCT/IB2018/051182
Publication Date:
October 04, 2018
Filing Date:
February 26, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
GF SRL (IT)
International Classes:
F16L11/118; D03D3/02; D04B1/22; F16L11/12
Foreign References:
DE202013101116U12013-03-25
EP3133328A12017-02-22
USD724186S2015-03-10
Attorney, Agent or Firm:
CASADEI, Giovanni (IT)
Download PDF:
Claims:
CLAIMS

1 . Extendible pipe comprising: an outer pipe (2); an elastic inner pipe (3), inserted into the outer pipe (2) and connected thereto at two opposite end zones; characterised in that the outer pipe (2) is extendible longitudinally in an elastic manner between a minimum length and a maximum length.

2. Extendible pipe according to claim 1 , wherein the outer pipe (2) comprises a non-elastic fabric (21 ) woven with elastic filaments (22).

3. Extendible pipe according to claim 2, wherein the non-elastic fabric comprises an equal number of wefts (21 a) and warps (21 b).

4. Extendible pipe according to claim 3, wherein each weft (21 a) weaves into all the warps (21 b).

5. Extendible pipe according to claim 3, wherein wefts and warps (21 a,21 b) comprise a bundle of filaments.

6. Extendible fabric according to claim 3, wherein wefts and warps (21 a,21 b), in a rest configuration of the outer pipe, are substantially perpendicular to one another.

7. Extendible fabric according to claim 6, wherein the fibres or elastic filaments (22) are woven in wefts and warps with a tilt of about 45°.

8. Extendible pipe according to claim 1 , wherein the outer pipe (2) comprises: a fabric wall (21 ) that has a weave that is deformable along a longitudinal direction (Y); a plurality of elastic filaments (22), woven into the fabric wall (21 ) and arranged parallel to the longitudinal direction (Y).

9. Extendible pipe according to claim 8, wherein the fabric wall (21 ) comprises a plurality of wefts and warps (21 a,21 b) arranged at a diagonal tilt with respect to the elastic filaments (22).

10. Extendible pipe according to claim 9, wherein wefts and warps (21 a,21 b) are arranged at a tilt of about 45° with respect to the elastic filaments (22).

Description:
"Extendible pipe for irrigation".

DESCRIPTION

The present invention relates to an extendible pipe, for example for irrigation, in general for supplying water or other liquids.

Pipes for irrigation are currently available on the market, typically intended for gardening, that have the characteristic of being extendible during use. In substance, the extendible pipe has a reduced length in rest conditions, i.e. when it is not being supplied with water, whereas it has a longer length in conditions of use, i.e. when it is being supplied with water.

The extension of the pipe substantially takes place due to the effect of the water pressure. In fact, the pipe is structured so as to be able to deform in length due to the effect of the water pressure.

For that purpose, extendible pipes currently available comprise an inner pipe, made of elastic material, and an outer pipe, made of non-elastic material. The elastic pipe is inserted into the non-elastic pipe. The two pipes are connected to each other at two end portions, while for the rest of the length they are not connected to each other.

In rest conditions the elastic inner pipe has a shorter length. In rest conditions, i.e. in the absence of water, the outer pipe assumes a corrugated or folded configuration, being compressed longitudinally by the inner pipe. In conditions of use, i.e. in the presence of a water supply, the inner pipe extends longitudinally and radially, pulling with it the outer pipe which, likewise, extends longitudinally, in a non-elastic way, until it reaches an extended, maximum length configuration, in which it also withholds the elastic inner pipe, preventing any further extension thereof. The non- elastic outer pipe also prevents any circumferential extension of the inner pipe.

Extendible pipes of the known type have some drawbacks. In particular, the corrugated configuration of the non-extendible outer pipe forms bends projecting from the outer pipe itself. Such bends are particularly exposed to the wear due to the pipe dragging along the ground, and in a short time undergo damage and tears at which the inner pipe can become lodged, also being damaged in turn. Furthermore, although the possibility of assuming the corrugated configuration allows the outer pipe to shorten, the corrugated configuration defines zones in which the outer pipe can get circumferentially flattened, assuming a larger diameter than the nominal diameter, and therefore determining an overall increase in the diameter of the pipe.

The object of the present invention is to offer an extendible pipe that allows the disadvantages of current extendible pipes to be overcome.

An advantage of the extendible pipe according to the present invention is that it always maintains a substantially cylindrical configuration, without forming bends or flattened parts. This leads to greater resistance to wear and smaller circumferential dimensions of the pipe.

Further characteristics and advantages of the present invention will become more apparent in the following detailed description of an embodiment of the present invention, illustrated by way of non-limiting example in the attached figures, in which:

- figure 1 shows a schematic view of the extendible pipe according to the present invention;

- figure 2 shows an enlargement of the extendible pipe of figure 1 .

The extendible pipe according to the present invention comprises an outer pipe (2) and an inner pipe (3), inserted into the outer pipe (2) and connected thereto at two opposite end zones. For example, the connection between the end zones of the outer pipe and of the inner pipe can be performed through connecting elements that allow the hydraulic connection of the inner pipe to a source of liquid or to a dispenser. Such connecting elements are known in the field and will therefore not be described in further detail. The inner pipe (3) is elastic, i.e. it is able to extend due to the effect of the pressure exerted by a fluid that flows into the pipe (3) itself. The inner pipe (3) can assume a rest configuration, in which it is not subject to strain and has a shorter length, and a use configuration, in which it assumes a longer length by effect of strain, e.g. by effect of the pressure exerted inside it by a fluid.

The outer pipe (2) is longitudinally extendible in an elastic way between a minimum length and a maximum length. The minimum length of the outer pipe (2) is substantially equal to the shortest length of the inner pipe (3). The maximum length of the outer pipe (2) is substantially equal to the longest length of the inner pipe (3). When it reaches its maximum length, the outer pipe (2) also withholds the inner pipe (3) in its maximum length, preventing it from extending further.

The elasticity with which it is equipped allows the outer pipe (2) to contract spontaneously towards the minimum length configuration. In this way, the outer pipe (2) maintains an overall cylindrical and regular configuration, i.e. it does not form undulations or corrugations as happens in current extendible pipes. This allows the outer pipe (2) to withstand better the wear due to rubbing on the ground. Furthermore, the cylindrical conformation of the outer pipe (2), maintained both in the minimum length configuration and in the maximum length configuration, limits the total dimensions also in the radial direction.

In a possible embodiment, the outer pipe (2) comprises a non-elastic fabric (21 ) interwoven with elastic filaments (22).

For example, the non-elastic fabric forms a fabric wall (21 ) of the outer pipe (2). Such fabric wall (21 ) has a deformable weave along a longitudinal direction (Y) i.e. in the direction of the length of the outer pipe (2), between the minimum length and the maximum length. A plurality of elastic filaments (22) are woven into the fabric wall (21 ) and arranged parallel to the longitudinal direction (Y). In a possible embodiment, shown schematically in figure 2, the fabric (21 ) is made of a plurality of wefts and warps (21 a,21 b) interwoven with each other to form a relatively slack pattern. In substance, the wefts and warps can rotate together about at least one axis perpendicular to the weaving surface, so as to allow a total elongation of the fabric (21 ) along the longitudinal direction (Y). The elastic filaments (22) are arranged parallel to the longitudinal direction (Y) and are interwoven with the wefts and/or warps. Preferably, the elastic filaments (21 ) have a minimum length, rest configuration, corresponding to the minimum length configuration of the outer pipe (2). In this way, the elastic filaments (21 ) are elastically opposed to the extension of the fabric (21 ) and, in the absence of strain, bring back the fabric (21 ) to the minimum length configuration, without causing significant undulations or ruffles in the fabric (21 ).

In a possible embodiment, the non-elastic fabric (21 ) comprises an equal number of wefts (21 a) and warps (21 b). Preferably, each weft (21 a) weaves into all the warps (21 b), as depicted in figure 2. In this way, the fabric (21 ) can extend uniformly along the longitudinal direction (Y) and along a direction perpendicular to the longitudinal direction (Y).

For example, wefts and warps (21 a,21 b), in a rest configuration of the outer pipe (2), are arranged at a diagonal tilt with respect to the elastic filaments (22). In the embodiment illustrated in figure 2, wefts and warps (21 a,21 b) are substantially perpendicular to one another. The elastic filaments (22) are woven in wefts and warps with a tilt of about 45°, and are parallel to the longitudinal direction (Y). Such configuration allows an easy non-elastic extension of the fabric (21 ) along the longitudinal direction (Y), and confers excellent shape stability to the outer pipe (21 ), which remains substantially cylindrical.

Each weft (21 a) and each warp (21 b) can be defined by a single filament, or may comprise a bundle of filaments arranged parallel to each other. In the embodiment illustrated in figure 2, each weft and each warp comprises a bundle of substantially parallel filaments. This confers excellent shape stability to the outer pipe (2), which is maintained substantially cylindrical for the entire length variation interval of the outer pipe (2).

The extendible pipe according to the present invention achieves important advantages.

The elastic structure of the outer pipe (2) allows all the drawbacks of current extendible pipes to be overcome. In fact, the outer pipe (2) is free to extend and shorten between the maximum and minimum length, without forming corrugations. In particular, in the minimum length configuration, the outer pipe still remains cylindrical. This means that, on the surface of the outer pipe, no zones are defined where the wear is more concentrated with respect to others. In this way, the outer pipe is generally more resistant to wear with respect to current extendible pipes.

Furthermore, since the outer pipe has a certain degree of elasticity, the extendible pipe generally has longer fatigue durability and a greater guarantee of returning to the minimum length in the rest phase, i.e. in the absence of pressure.

Finally, the elasticity of the outer pipe allows the extendible pipe to return to the minimum length configuration more quickly.