WO1997047907A1 - Flexible hose for supplying a liquid to a manual tool - Google Patents
Flexible hose for supplying a liquid to a manual tool Download PDFInfo
- Publication number
- WO1997047907A1 WO1997047907A1 PCT/IT1997/000126 IT9700126W WO9747907A1 WO 1997047907 A1 WO1997047907 A1 WO 1997047907A1 IT 9700126 W IT9700126 W IT 9700126W WO 9747907 A1 WO9747907 A1 WO 9747907A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tube
- internal tube
- supplying
- flexible hose
- liquid
- Prior art date
Links
- 239000007788 liquid Substances 0.000 title claims description 5
- 239000012815 thermoplastic material Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 229920005992 thermoplastic resin Polymers 0.000 claims description 3
- 239000004753 textile Substances 0.000 abstract description 6
- 239000004033 plastic Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229920000728 polyester Polymers 0.000 description 3
- 229920002994 synthetic fiber Polymers 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L11/11—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall
- F16L11/112—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall having reinforcements embedded in the wall
Definitions
- the present invention relates to a flexible hose for supplying a liquid to a manual tool such as, for example, a delivery nozzle of a hot or cold-water pressure washer.
- a manual tool such as, for example, a delivery nozzle of a hot or cold-water pressure washer.
- pressure washers are machines consisting substantially of a compressor which brings the water, supplied from the water mains, up to a pressure of about 100-200 bar in order to feed a delivery nozzle held by an operator who directs the jet in the desired direction.
- the connection between compressor and delivery nozzle is effected by means of a hose made of plastic material having a length of a few metres or even 10 or more metres.
- the hoses which are currently used are stratified hoses, i.e. composed of: a smooth internal tube made of PVC or polyester or polypropylene or in any case a thermoplastic resin obtained by means of extrusion; a textile covering layer which is formed by interweaving yarns of natural or synthetic fibre such as polyester and which surrounds the aforementioned tube; an external sheathing or covering layer made of PVC or any thermoplastic material.
- hoses briefly mentioned above have proved to be suitable for connecting fixed machine parts or parts where there are constant small movements, but not for connecting the delivery nozzles of pressure washers since continuous manoeuvring of the delivery nozzle by the operator often results in the formation of folds which cause squashing of the hose and hence closing thereof.
- These hoses moreover, have proved to be particularly heavy especially when of considerable length, as well as awkward to manoeuvre since their rigidity makes them difficult to bend and roll up.
- the water is also heated to a high temperature.
- plastic hoses of the known type cannot be used for water temperatures above 70°C since, under these conditions, hydrolysis phenomena resulting in decomposition of the plastic occur; for said temperatures, extremely costly rubber hoses are used.
- plastic hoses for fluid temperatures greater than 70°C have a high degree of rigidity to the point that they become unusable in applications involving the connection of moving parts.
- the object of the present invention is that of providing a stratified plastic hose which is extremely flexible and light and which can achieve minimum radii of curvature without causing squashing of the hose itself.
- the corrugated internal tube is made of polyamide.
- the textile covering layer is further covered by an external sheathing made of PVC or any other thermoplastic material.
- FIG. 1 denotes an internal tube having corrugations la with a substantially square shape, i.e. the longitudinal section of the tube has a square- wave profile.
- the tube 1 is made of polyamide using techniques which are already known.
- 2 denotes a textile covering layer which surrounds entirely the internal tube 1; the textile covering layer surrounds the tube 1 with one or more layers and is made with natural or synthetic fibres or with metal wires.
- 3 denotes an external covering layer or external tube made of PVC or any other thermoplastic material.
- the corrugated internal tube has a longitudinal section with sinusoidal waves lb.
- the corrugations of the internal tube both in the embodiment in Figure 1 and in the embodiment in Figure 2 confer on the finished hose, denoted in its entirety by 4, a notable flexibility and lightness, whereas the pressure tightness is guaranteed by the textile covering layer which surrounds the internal tube in one or more layers depending on the pressures which are to be reached inside the tube.
- the corrugated internal tube 1 may be made with one or more layers of different material in order to be able to reduce the raw material costs or widen the field of use of the materials.
- corrugation profile may be different from that illustrated in the two figures, without thereby departing from the protective scope of the claims indicated below.
- the corrugated tube it is possible to achieve the advantage of being able to convey high-temperature fluids, while maintaining a high degree of flexibility.
- specific reference has been made to the application of the hose for supplying a delivery nozzle of a pressure washer it is obvious that application thereof may be extended to the supplying of any manual tool supplied with a liquid, such as a paint- spraying gun for example.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Cleaning In General (AREA)
- Devices For Medical Bathing And Washing (AREA)
Abstract
The invention falls within the sector of flexible hoses for supplying delivery nozzles of pressure washers and comprises an internal tube (1) having corrugations (1a) or (1b), said tube being surrounded by an interwoven textile covering layer (2). A sheath or external tube (3) made of PVC or other thermoplastic material surrounds the covering layer and completes the tube (4).
Description
FLEXIBLE HOSE FOR SUPPLYING A LIQUID TO A MANUAL TOOL
DESCRIPTION The present invention relates to a flexible hose for supplying a liquid to a manual tool such as, for example, a delivery nozzle of a hot or cold-water pressure washer. As is known, pressure washers are machines consisting substantially of a compressor which brings the water, supplied from the water mains, up to a pressure of about 100-200 bar in order to feed a delivery nozzle held by an operator who directs the jet in the desired direction. The connection between compressor and delivery nozzle is effected by means of a hose made of plastic material having a length of a few metres or even 10 or more metres.
The hoses which are currently used are stratified hoses, i.e. composed of: a smooth internal tube made of PVC or polyester or polypropylene or in any case a thermoplastic resin obtained by means of extrusion; a textile covering layer which is formed by interweaving yarns of natural or synthetic fibre such as polyester and which surrounds the aforementioned tube; an external sheathing or covering layer made of PVC or any thermoplastic material.
The hoses briefly mentioned above have proved to be suitable for connecting fixed machine parts or parts
where there are constant small movements, but not for connecting the delivery nozzles of pressure washers since continuous manoeuvring of the delivery nozzle by the operator often results in the formation of folds which cause squashing of the hose and hence closing thereof. These hoses, moreover, have proved to be particularly heavy especially when of considerable length, as well as awkward to manoeuvre since their rigidity makes them difficult to bend and roll up. According to one type of pressure washer, the water is also heated to a high temperature.
In this case the plastic hoses of the known type cannot be used for water temperatures above 70°C since, under these conditions, hydrolysis phenomena resulting in decomposition of the plastic occur; for said temperatures, extremely costly rubber hoses are used. Moreover, the plastic hoses for fluid temperatures greater than 70°C have a high degree of rigidity to the point that they become unusable in applications involving the connection of moving parts.
The object of the present invention is that of providing a stratified plastic hose which is extremely flexible and light and which can achieve minimum radii of curvature without causing squashing of the hose itself. These objects are all achieved by the flexible hose forming the
subject of the present invention which involves the combined arrangement of a corrugated internal tube made of thermoplastic resin and covered by a layer of interwoven yarns of natural or synthetic fibre, such as polyester for example.
Preferably, but not exclusively the corrugated internal tube is made of polyamide.
The textile covering layer is further covered by an external sheathing made of PVC or any other thermoplastic material.
These and other characteristic features will emerge more clearly from the following description of a preferred embodiment shown purely by way of a non-limiting example in the accompanying illustrative plate in which: - Figure 1 shows a longitudinal section through the hose, revealing the layers which form it;
- Figure 2 shows the same cross-section with the internal tube formed with a differently shaped corrugation. With reference to Figure 1, 1 denotes an internal tube having corrugations la with a substantially square shape, i.e. the longitudinal section of the tube has a square- wave profile.
The tube 1 is made of polyamide using techniques which are already known. 2 denotes a textile covering layer which surrounds
entirely the internal tube 1; the textile covering layer surrounds the tube 1 with one or more layers and is made with natural or synthetic fibres or with metal wires. 3 denotes an external covering layer or external tube made of PVC or any other thermoplastic material.
According to a possible variant illustrated in Figure 2), the corrugated internal tube has a longitudinal section with sinusoidal waves lb. The corrugations of the internal tube both in the embodiment in Figure 1 and in the embodiment in Figure 2 confer on the finished hose, denoted in its entirety by 4, a notable flexibility and lightness, whereas the pressure tightness is guaranteed by the textile covering layer which surrounds the internal tube in one or more layers depending on the pressures which are to be reached inside the tube.
The corrugated internal tube 1 may be made with one or more layers of different material in order to be able to reduce the raw material costs or widen the field of use of the materials.
Obviously the corrugation profile may be different from that illustrated in the two figures, without thereby departing from the protective scope of the claims indicated below. With the corrugated tube it is possible to achieve the
advantage of being able to convey high-temperature fluids, while maintaining a high degree of flexibility. Although, in the description, specific reference has been made to the application of the hose for supplying a delivery nozzle of a pressure washer it is obvious that application thereof may be extended to the supplying of any manual tool supplied with a liquid, such as a paint- spraying gun for example.
Claims
CLAIMS Flexible hose for supplying a liquid to a manual tool, characterized in that it comprises in combination:
- a corrugated internal tube (1) made of thermoplastic resin and covered by one or more layers of interwoven yarns (2) ;
- an external tube or sheathing (4) made of PVC or any other thermoplastic material .
Hose according to Claim 1, characterized in that the corrugated internal tube (1) is made of moulded polyamide.
Hose according to Claim 1, characterized in that the longitudinal profile of the internal tube (1) has a square-wave corrugation (la) .
Hose according to Claim 1, characterized in that the longitudinal profile of the internal tube (1) has a sinusoidal-wave corrugation (lb) .
Flexible hose according to Claim 1, characterized in that the internal tube (1) is formed with one or more layers of different material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU30475/97A AU3047597A (en) | 1996-06-12 | 1997-06-03 | Flexible hose for supplying a liquid to a manual tool |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT96PR000012 IT241421Y1 (en) | 1996-06-12 | 1996-06-12 | FLEXIBLE HOSE FOR THE SUPPLY OF LANCES OF HIGH PRESSURE CLEANERS IN AQUACALDA OR COLD |
| ITPR96U000012 | 1996-06-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1997047907A1 true WO1997047907A1 (en) | 1997-12-18 |
Family
ID=11395992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IT1997/000126 WO1997047907A1 (en) | 1996-06-12 | 1997-06-03 | Flexible hose for supplying a liquid to a manual tool |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU3047597A (en) |
| IT (1) | IT241421Y1 (en) |
| WO (1) | WO1997047907A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1175042A (en) * | 1966-03-11 | 1969-12-23 | Compoflex Co Ltd | Improvements in or relating to Flexible Hose or Tubing |
| GB1283216A (en) * | 1969-08-28 | 1972-07-26 | Compoflex Co Ltd | Improvements in or relating to flexible hose or tubing |
| FR2451533A1 (en) * | 1979-03-16 | 1980-10-10 | Fukushima Kazutaka | Flexible cable conduit - with flexible metallic hose surrounded by filament braiding in soft plastomer sheath |
-
1996
- 1996-06-12 IT IT96PR000012 patent/IT241421Y1/en active
-
1997
- 1997-06-03 AU AU30475/97A patent/AU3047597A/en not_active Abandoned
- 1997-06-03 WO PCT/IT1997/000126 patent/WO1997047907A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1175042A (en) * | 1966-03-11 | 1969-12-23 | Compoflex Co Ltd | Improvements in or relating to Flexible Hose or Tubing |
| GB1283216A (en) * | 1969-08-28 | 1972-07-26 | Compoflex Co Ltd | Improvements in or relating to flexible hose or tubing |
| FR2451533A1 (en) * | 1979-03-16 | 1980-10-10 | Fukushima Kazutaka | Flexible cable conduit - with flexible metallic hose surrounded by filament braiding in soft plastomer sheath |
Also Published As
| Publication number | Publication date |
|---|---|
| IT241421Y1 (en) | 2001-05-09 |
| ITPR960012U1 (en) | 1997-12-12 |
| AU3047597A (en) | 1998-01-07 |
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