GB2131911A - Flexible pressure hose - Google Patents
Flexible pressure hose Download PDFInfo
- Publication number
- GB2131911A GB2131911A GB08330892A GB8330892A GB2131911A GB 2131911 A GB2131911 A GB 2131911A GB 08330892 A GB08330892 A GB 08330892A GB 8330892 A GB8330892 A GB 8330892A GB 2131911 A GB2131911 A GB 2131911A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure hose
- sheathing
- ofthe
- hose
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001746 injection moulding Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 8
- 229920003023 plastic Polymers 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 238000007373 indentation Methods 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 abstract description 41
- 238000001816 cooling Methods 0.000 abstract description 2
- 210000003739 neck Anatomy 0.000 abstract 1
- 230000032683 aging Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003313 weakening effect Effects 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear
-
- 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
- F16L11/12—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Thermal Insulation (AREA)
- Buffer Packaging (AREA)
- Joints That Cut Off Fluids, And Hose Joints (AREA)
Abstract
At least one protective ring is injection-moulded onto the surface (6) of a pressure hose (2) which is deformed by an injection moulding die (11). The securing-in-position of the protective ring (1) on the pressure hose (2) is accomplished in that the protective ring (1) solidifies after cooling and necks down the pressure hose. <IMAGE>
Description
SPECIFICATION
Flexible pressure hose
This invention relates to a flexible pressure ofthe
kind having at least one sheathing formed on the
elastic surface of the pressure hose.
In a known pressure hose of this type, (German patent21 51 506),thesheathing isformed byprotec- tive rings which are injection-moulded onto the hose
surface at predetermined intervals. These protective
rings maintain their position on the pressure hose on
account of a shrinkfit which takes place after the
injection-moulding process by cooling ofthe protective rings. However, practical operations have shown that a protective ring which is made by this manufacturing process embraces the pressure hose with
comparatively low preload only. Therefore, a small
displacing force will often besufficienttoshiftthe protective ring from its predetermined position.This
displacing force may be encountered, for instance, if,
in a moving vehicle, the vibrations generated in the
longitudinal direction ofthe pressure hose aretrans- mitted via a protective ring onto a housing edge.
Also the enlargement of the pressure hose ensuing from its pressurisation, as well as ageing ofthe hose
material and of the protective ring are the cause of a continuous weakening oftheshrinkfitandthe displacing force. Hence itfollowsthatthe protective
rings slide from the portion protecting the pressure hose and that the pressure hose is exposed to great frictional engagementwhich may result in leakage at the pressure hose.
It is therefore an object of the present invention to
improve a pressure hose ofthe kind initially referred to
in such a way as to enable a simple and reliable
retaining ofthe protective ring on the pressure hose by as economical a manufacture as possible. In addition, a manufacturing method for such a pressure hose is to be accomplished by which, during the manufacture ofthe protective ring, there will be established a simultaneous frictional and positive engagement between the protective ring and the pressure hose without additidnal design arrangements.
According to the invention in its broadest aspect, a flexible pressure hose of the kind referred to is characterised in thatthe surface ofthe sheathing which touches the surface ofthe pressure hose corresponds to the deformed surface ofthe pressure hose in the area ofthe sheathing, the deformed surface being formed priortothe injection-moulding ofthe sheathing by radial necked-down portions which act on the pressure hose laterally of the sheathing.
In dependence upon the conditions of application of the pressure hose, the indentations atthe sheathing and atthe protective ring, respectively, can be obtained by correspondingly deep necked-down portions atthe pressure hose prior to the injectionmoulding ofthe sheathing. Not even in the event of fatigue of material ofthe elastic components will the expansions which ensue atthe pressure hose under high operating pressures result in a displacement of the protective ring on the pressure hose, provided that the necked-down portion atthe pressure hose is sufficiently deep.According to the elasticity of the pressure hose, the surface ofthe sheathing which touches the surface of the pressure hose may be curved over its entire length (as is the case with particularly soft pressure hoses), or it is merely curved at the edges (as is the case with solid pressure hoses).
The deepest necked-down portion, however, is always disposed atthe height of the lateral surface confining the sheathing.
It will be advantageous ifthe hose comprises end fittings secured to its ends and the sheathing partially encloses the end fitting and the pressure hose. Thus, the sheathing can be utilised also as a protective hose which will then impart abrasion-resistance and direc tional stabilitytothe pressure hose, its one end being secured to the end fitting, while its other end is fastened to the pressure hose.
To the effectthatthe sheathing is not only secured in a non-skid fashion in a longitudinal direction ofthe pressure hose, but is also prevented from torsion in a circumferential direction of the pressure hose, the deformed surface is preferably interrupted by elevations or indentations.
A method for the manufacture of a flexible pressure hose ofthe kind referred to preferably consists in that the pressure hose is inserted into a jet mould which contains at least one chamber adjacent to the surface ofthe pressure hose, in that the jet mould forming the chamber compresses the pressure hose in such a mannerthatthe surface ofthe pressure hose that is enclosed inthechamberwill be likewise radially narrowed down, in that the chamber is subsequently filled up with fusible plastics material, in that afterthe solidification of the plastics material the pressure exerted on the pressure hose bythejet mould is removed and in that the pressure hosetogetherwith the thus manufactured sheathing rigidly connected to it is then taken out ofthe jet mould.This method bears the advantage that, simultaneously with the moulding process, the fastening means will be shaped atthe sheathing and the protective ring or protective hose, respectively, without any additional effort, the fastening means being constituted due to the necked-down portions ofthe pressure hose by corresponding elevations at the sheathing. To this end, the plane of division of the jet mould has to be chosen such that the lateral end ofthe mould will narrow down the hose priorto plastics material being injected into the chamberwhich forms the sheathing. With this method, the end fittings can also be mounted to the pressure hose already priortothe insertion ofthe pressure hose into the jet mould.When injectionmoulding a protective hose which abuts on the end fitting and on the pressure hose, the jet mould must be of such a design that only the portion that is closed to the pressure hose will be narrowed down by the jet mould, while the other end ofthe protective hose conforms to the surfaceofthe end fitting.
The sheathing can advantageously be made of any rubber-elastic plastics material. Such materials are polyurethane or polyvinylchloride,for instance. The properties of elastic gums are required in particular with protective hoses which are meantto prevent buckling ofthe pressure hose, as in contrast to rubber, elastic gums can be injection-moulded onto a pressure hose and therefore provide ease of manufacture.
An embodiment ofthe invention will now be described by way of example with reference to the accompanying drawings, in which:
Figure 1 is a section of a pressure hose in the area of a protective ring,
Figure 2 is a cross-section through the pressure hose taken along line Il-Il of Figure 1, and
Figure 3 is a partial cross-section above the centre line of a pressure hose showing the manufacture of the protective ring.
In Figures 1 and 2 of the drawing, the protective ring 1 is guided on the pressure hose 2. The protective ring 1 is of substantially rectangular cross-section. However, other cross-sections of the protective ring 1 are likewise possible. With its surface4touching the surface 3 of the pressure hose 2, the protective ring 1 narrows down the pressure hose 2 in such a way that the necked-down portion 5 is largestatthe deformed surface 6 in the area ofthe edges7 atthe protective ring 1. As the necked-down portion 5 shown in Figure 1 forms a concave surface in the area of the protective ring 1, it can be taken that the pressure hose 2 is composed of a particularly elastic material.In the event of less elastic pressure hoses, the necked-down portion atthe pressure hose will be only in the area of the end ofthe protective ring 1 and will not extend up to the middle of the protective ring 1 according to
Figure 1.
The deformed surface 6 comprises, evenly distri
buted over its periphery, elevations 8 which com
mence as ribs 9 atthe edge 7 and tapertowards the
middle ofthe protective ring 1 and pass into the surface 3 of the protective hose 2, respectively. The
ribs 9 form corresponding indentations atthe surface 4 of the protective hose 1 so that, as a result, the protective ring 1 is held on the pressure hose 2 in a torsionally-secured fashion. The necked-down portions 5 serve to connect rigidly the protective ring 1 with the pressure hose 2 in a longitudinal direction.
The pressure hose 2 contains a bore 10 in which the pressure fluid is supplied.
Parts in Figure 3 ofthe drawing which correspond to parts in Figures 1 and 2 have been assigned like reference numerals. In Figure 3, a substantially annular jet mould 11 embracesthe pressure hose 2.
The jet mould 11 comprises a chamber 12 adjacentto the surface 3 ofthe pressure hose 2 and serving to shape the protective ring 1 according to Figure 1. The two annular legs 13,14 of the substantially U-shaped cross-section of the jet mould 11 compress attheir radially inner periphery 15, 1 6the surface 3 ofthe pressure hose 2 in such a mannerthatthe area of the pressure hose 2 which lies outside the peripheries 15, 16will also be deformed. The inner peripheries 15, 16 contain longitudinal grooves 17, l8wherebythe surface3 ofthe pressure hose 2 will be necked down less deeply in this area. According to requirement, an optional number of grooves 17,18 can be designed at the peripheries 15, 16. Afterthe injection-moulding of fusible plastics material into the chamber 12 and the subsequent solidification of the protective ring 1 thus produced, the jet mould 11 can be removed from the pressure hose 2. The surface 3 ofthe pressure hose 2 will nowbeunableto re-assume its original form, since the protective ring 1 produces a durable necked-down portion 5. This engagement ensures that the protective ring 1 is retained on the pressure hose 2 in a stationary and torsionally-secured manner.
In the embodiment according to Figures 1 to 3, the pressure hose 2 is necked down at both edges 7 of the protective ring 1. It is, however, also possible to neck down only one side of the pressure hose 2 by suitably adapting the jet mould.
Claims (7)
1. Aflexible pressure hose ofthe kind having at least one sheathing formed on the elastic surface of the pressure hose, characterised in that the surface (4) of the sheathing (1 ) which touches the surface (3) of the pressure hose (2) corresponds to the deformed surface (6) ofthe pressure hose (2) in the area ofthe sheathing (1), the deformed surface (6) being formed priortothe injection moulding of the sheathing (1 ) by radial necked-down portions (5) which act on the pressure hose (2) laterally ofthe sheathing (1).
2. Aflexible pressure hose as claimed in claim 1 comprising end fittings secured to its ends, characterised in that the sheathing (1 ) partially encloses the end fitting and the pressure hose (2).
3. Aflexible pressure hose as claimed in claim 1 or 2. characterised in that the deformed surface (6) is interrupted by elevations or indentations (8).
4. A method for the manufactureofaflexible pressure hose, as claimed in any one of claims 1,2 or 3, characterised in thatthe pressure hose (2) is inserted into a jet mould (11) which contains at least one chamber (12) adjacentto the surface (3) of the pressure hose (2), in that the jet mould forming the chamber(12) compressesthe pressure hose (2) in such a mannerthatthesurface ofthe pressure hose (2) that is enclosed in the chamber (12) will be likewise radially necked down, in thatthe chamber (12) is subsequentlyfilled up with fusible plastics material, in that afterthe solidification of the plastics material the pressure exerted on the pressure hose (2) by the jet mould (11) is removed, and in thatthe pressure hose (2) togetherwith the thus manufactured sheathing (1 ) rigidly connected to it is then taken out ofthe jet mould (11).
5. Aflexible pressure hose as claimed in any one of the preceding claims, characterised in that the sheathing (1 ) is made of a rubber-elastic plastics material.
6. Aflexible pressure hose substantially as described with reference to the accompanying drawings.
7. A method of manufacturing a flexible pressure hose substantially as described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19823246219 DE3246219A1 (en) | 1982-12-14 | 1982-12-14 | FLEXIBLE PRESSURE HOSE |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8330892D0 GB8330892D0 (en) | 1983-12-29 |
| GB2131911A true GB2131911A (en) | 1984-06-27 |
| GB2131911B GB2131911B (en) | 1986-03-19 |
Family
ID=6180615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08330892A Expired GB2131911B (en) | 1982-12-14 | 1983-11-18 | Flexible pressure hose |
Country Status (5)
| Country | Link |
|---|---|
| DE (1) | DE3246219A1 (en) |
| ES (2) | ES276280Y (en) |
| FR (1) | FR2537692B1 (en) |
| GB (1) | GB2131911B (en) |
| IT (1) | IT1169975B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008123979A1 (en) * | 2007-04-06 | 2008-10-16 | The Gates Corporation | Overmolded standoff and method for abrasion routing protection of a hose |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3345203A1 (en) * | 1983-12-14 | 1985-06-27 | Alfred Teves Gmbh, 6000 Frankfurt | FLEXIBLE PRESSURE HOSE |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR374650A (en) * | 1907-02-15 | 1907-06-18 | Max Beyer | Improvements to pipes intended to conduct a pressurized fluid |
| DE825026C (en) * | 1950-07-23 | 1951-12-17 | Rheinische Roehrenwerke A G | On its entire outer surface with a tube provided with a protective layer resistant to aggressive influences |
| DE1751881U (en) * | 1957-07-10 | 1957-09-05 | Weinheimer Gummiwarenfab | REINFORCEMENT ON PRESSURE HOSES WITH COUPLING FITTINGS. |
| GB970290A (en) * | 1961-07-06 | 1964-09-16 | Ass Elect Ind | Improvements relating to flexible hose |
| DE2151506C2 (en) * | 1971-10-15 | 1982-03-11 | The Weatherhead Co., Cleveland, Ohio | Abrasion resistant hose - having longitudinally spaced bumpers |
| DE8007478U1 (en) * | 1980-03-19 | 1980-06-19 | Fag Kugelfischer Georg Schaefer & Co, 8720 Schweinfurt | BRAKE HOSE |
| DE8138301U1 (en) * | 1981-06-09 | 1982-04-29 | Küster & Co GmbH, 6332 Ehringshausen | HOSE OR PIPE WITH A COATING AND AT LEAST ONE PROTECTIVE BUFFER |
-
1982
- 1982-12-14 DE DE19823246219 patent/DE3246219A1/en active Granted
-
1983
- 1983-11-18 GB GB08330892A patent/GB2131911B/en not_active Expired
- 1983-12-13 IT IT24132/83A patent/IT1169975B/en active
- 1983-12-13 ES ES1983276280U patent/ES276280Y/en not_active Expired
- 1983-12-13 FR FR8319933A patent/FR2537692B1/en not_active Expired
- 1983-12-13 ES ES527996A patent/ES8406688A1/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9303797B2 (en) | 2006-07-17 | 2016-04-05 | Gates Corporation | Overmolded standoff and method for abrasion routing protection of a hose |
| WO2008123979A1 (en) * | 2007-04-06 | 2008-10-16 | The Gates Corporation | Overmolded standoff and method for abrasion routing protection of a hose |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2537692A1 (en) | 1984-06-15 |
| DE3246219A1 (en) | 1984-06-14 |
| GB8330892D0 (en) | 1983-12-29 |
| IT8324132A0 (en) | 1983-12-13 |
| ES527996A0 (en) | 1984-08-01 |
| DE3246219C2 (en) | 1989-11-23 |
| IT1169975B (en) | 1987-06-03 |
| ES276280Y (en) | 1984-12-16 |
| FR2537692B1 (en) | 1987-02-27 |
| ES8406688A1 (en) | 1984-08-01 |
| ES276280U (en) | 1984-05-01 |
| GB2131911B (en) | 1986-03-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19961118 |