GB1582503A – Method and apparatus for manufacturing hose
– Google Patents
GB1582503A – Method and apparatus for manufacturing hose
– Google Patents
Method and apparatus for manufacturing hose
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Publication number
GB1582503A
GB1582503A
GB20405/78A
GB2040578A
GB1582503A
GB 1582503 A
GB1582503 A
GB 1582503A
GB 20405/78 A
GB20405/78 A
GB 20405/78A
GB 2040578 A
GB2040578 A
GB 2040578A
GB 1582503 A
GB1582503 A
GB 1582503A
Authority
GB
United Kingdom
Prior art keywords
tube
bundle
hose
conductor
wire bundle
Prior art date
1977-06-01
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.)
Expired
Application number
GB20405/78A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Goodyear Tire and Rubber Co
Original Assignee
Goodyear Tire and Rubber Co
Priority date (The priority date 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 date listed.)
1977-06-01
Filing date
1978-05-18
Publication date
1981-01-07
1978-05-18
Application filed by Goodyear Tire and Rubber Co
filed
Critical
Goodyear Tire and Rubber Co
1981-01-07
Publication of GB1582503A
publication
Critical
patent/GB1582503A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
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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
F16L11/12—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
F16L11/127—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 electrically conducting
B—PERFORMING OPERATIONS; TRANSPORTING
B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
B29C48/151—Coating hollow articles
B29C48/152—Coating hollow articles the inner surfaces thereof
B29C48/153—Coating both inner and outer surfaces
B—PERFORMING OPERATIONS; TRANSPORTING
B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
B—PERFORMING OPERATIONS; TRANSPORTING
B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
Description
( 21)
( 31) ( 33) Application No 20405/78 ( 22) Filed Convention Application No 802404 18 May 1978 ( 19) ( 32) Filed 1 Jun 1977 in /< United States of America (US) ( 44) Complete Specification Published 7 Jan 1981 ( 51) INT CL 3 F 16 L 11/12 ( 52) Index at Acceptance F 2 P 1 A 13 1 A 23 A 1 A 25 1 A 9 1 B 7 2 A 5 ( 54) METHOD AND APPARATUS FOR MANUFACTURING HOSE ( 71) We, THE GOODYEAR TIRE & RUBBER COMPANY, a corporation organised under the laws of the state of Ohio, United States of America, of 1144 East Market Street, Akron, Ohio, United States of America, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly de-
scribed in and by the following statement:-
This invention generally relates to a method and apparatus for manufacturing a hose having an embedded electrical conductor for preventing accumulated electrostatic charge.
There are various hose applications wherein an electrostatic charge poses a safety hazard in the use of the hose as for example, in the conveyance of inflammable fuels, grain materials, paint, etc In this circumstance, attempts have been made to incorporate an electrical conductor into the body structure of the hose such that any accumulated charge may be dispersed and the hazard eliminated These attempts generally involve helically winding an electrical conductor into the hose structure during the hose building operation and covering it with one or more layers of braided fabric and/or elastomer as exemplified in United States Patents Nos 3,543,803 and 3,780,208 The wire conductir is wound so that it flexes in the normal use of the hose and does not impair the flexibility of the hose.
A disadvantage of this type of construction resides in the fact that the conductor by virtue of its cross-section, develops a ridge in the outer plies of the hose structure The ridge is accentuated if the hose is built via non-mandrel construction techniques and cured without benefit of a lead covering.
The lead press curing method as well known in the industrv and generally involves internally pressurizing lengths of the hose, running it through a lead press to apply an outer sheeth of lead, and curing the resulting structure in an autoclave Upon finishing the cure, the lead sheath is stripped off and recycled The lead press curing method, while providing a hose having an improved surface appearance, increases the manufacturing costs of a highly competitive product.
Attempts at manufacturing hose having an incorporated conductor using non-mandrel techniques and eliminating the lead press curing method have resulted in an increase in elastomeric covering material for the protection of the conductor wire This of course has resulted in an increase in weight and cost of the product while not completely eliminating the unsightly ridge on the surface of the hose.
Other attempts at incorporating an embedded conductor in a hose structure, include various type flat or ribbon conductors as exemplified in United States Patent No 3,555,170 wherein copper threads and elastic yarn are woven into a tape or ribbon that is ultimately laid along the hose length, parallel to the hose axis The ribbon conductor will thus stretch to accommodate hose elongation in the normal use of the hose.
While this type conductor eliminates the ridge appearance and other disadvantages of wound conductors, it has the disadvantage of being difficult to handle in the course of a hose manufacturing process and it is a more expensive conductor to produce, thus again increasing the cost of a highly competitive product.
A solution to the above-mentioned problems may be had by incorporating a multiple wire braided conductor into the body structure of the hose as disclosed in United States Patent No 3 042 737 In this instance, the embedded conductor comprises a bundle of small diameter, braided wire conductors in a flattened configuration such as to exhibit the smallest cross-sectional area as the conductor is laid along the longitudinal axis of the PATENT SPECIFICATION ror LI) XI ( 11) 1 582 503 1 582 503 hose.
According to one aspect of this invention, there is provided a method of manufacturing a hose incorporating a conductor of static electricity comprising the steps of extruding an elastomeric tube; pressurizing the tube to effect a substantially rounded cross-section; shortening a loosely braided wire bundle in its axial direction so that the individual wires of the bundle each become increasingly sinusoidal; compressing the shortened wire bundle in a direction transversely of its axis to flatten and form a conductor; laying the conductor onto the elastomeric tube parallel to the tube axis; wrapping the tube with a textile material to hold the conductor in position on the tube; extruding a cover of elastomeric material over the wrapped tube to form an integral hose structure; and curing the hose structure.
According to another aspect of this invention, there is provided hose manufacturing apparatus comprising a first extruder for extruding an elastomeric tube, means for pressurising the tube to effect a substantially rounded cross-section; means for supplying a loosely braided wire bundle; means for shortening the loosely braided wire bundle in its axial direction so that the individual wires of the bundle each become increasingly sinsoidal and for compressing the shortened wire bundle in a direction transversely of its axis to flatten and form a conductor; the first extruder, the supply means, the means for shortening the wire bundle, and for compressing the shortened wire bundle being positioned so that the conductor is laid onto the elastomeric tube parallel to the axis of the tube; wrapping means for wrapping the tube with a textile material to hold the conductor in position on the tube; and a second extruder for extruding a cover of an elastomeric material over the wrapped tube to form an integral structure.
The present invention provides a method and apparatus for making a flexible hose structure incorporating a braided static conductor that remains invisible on the surface of the hose while maintaining the original flexibility of the hose The invention takes advantage of non-mandrel construction techniques while also eliminating the lead press curing method.
A method and an apparatus according to the invention will now be described, by way of example, with reference to the accompanying drawing wherein:Figure 1 is a side elevational view of a hose partially broken away to illustrate the orientation of the static conductor, the hose being produced by apparatus according to this invention:
Figure 2 is a transverse sectional view of the hose shown in Figure 1; Figure 3 is a top plan view of apparatus according to the invention with the hose tube being shown as coming out of the page; and Figure 4 is an elevational view of the apparatus shown in Figure 3 showing a length of hose core tubing as it would be moved through the apparatus.
Referring to Figures 1 and 2, a hose as may be made by the method and apparatus of this invention is generally indicated by reference numeral 10 Conventionally, the hose 10 is built by extruding an elastomeric core tube 14 which is closed at its ends and is slightly pressurized to round out its cross section The uncured core tube 14 is covered by a textile reinforcement 18 and ultimately by an extruded elastomeric cover 20 Upon application of the extruded cover 20, the hose is cured by conventional lead press during techniques well known to those working in the art Finally, the lead sheath is removed and reused also in the well known and understood manner in the art.
A static electricity conductor 16 is laid on the core tube 14 just prior to the braid point indicated by line 12-12 as the core tube moves in the direction of arrow 22 The conductor 16 comprises in its initial form, a multi-strand bundle of fine conductor wires 16 ' that are compressed in the axial direction such as to approximate a plurality of interweaving sinusoids as shown in Figure 1.
The circular cross section of the original bundle is thus first expanded in the directions transverse to the axis and then flattened so as to exhibit a minimal cross sectional area.
Expanding of the multi-strand conductor 16 is accomplished in apparatus generally indicated by reference numeral 30 in Figures 3 and 4 The apparatus 30 is mounted on a deck plate 24 of a conventional vertical braiding machine as made and marketed by The Textile Machinery Division of Rockwell International Corporation, Norristown, Pennsylvania.
The braider draws an uncured core tube 14 through the machine in a vertical direction by a driven, over-head mounted, large diameter pickup wheel (not shown) A textile material 18 is braided onto the core tube as it moves vertically through the machine whereupon it is picked up by the overhead wheel for transport to an extruder for application of a cover ply of elastomer.
The apparatus 30 is mounted to the braider deck plate 24 in a relative position to the hose core tube as it passes vertically upward through an opening 26 in the deck plate 24 The apparatus 30 comprises a source supply 32 of a loose braid of small diameter flexible wires 16 mounted via a spool 34 in a substantially horizontal feed position to the deck plate 24 The apparatus 1 582 503 also comprises a first roller pair 36 mounted within the deck plate opening 26 in a position to accept the wire bundle 16 therebetween and a second roller pair 38 mounted downstream relative to the first roller pair such as also to receive the wire therebetween The second roller pair is driven via a belt drive 40 off of a pulley 42 and belt 44 being in turn driven by a sprocket 46 mounted on the drive shaft 48 of the braiding machine The first roller pair 36 is driven off of the second roller pair 38 by reason of a belt drive 50 and the arrangement of the driven roller pairs 36, 38 is such that pair 36 rotates at a faster speed than roller pair 38.
In operation of the apparatus 30, the loosely braided wire bundle 16 is picked up between the first roller pair 36 and moved to the second roller pair 38 Because of the difference in rotational speeds of the roller pairs 36, 38 the wire bundle 16 tends to be shortened in its axial direction and thus spread transversely of its axis as it moves between the two roller pairs 36, 38 Upon moving into the second roller pair 38, a vertical compressive force is applied to the spread wire bundle such as to flatten it further and then it is applied to the hose core tube 14, along its length and parallel to the hose axis as it ascends vertically through the braider At the machine braid point, the textile is applied over the shortened and flattened conductor and it is held in place on the hose core tube by the tension of the textile braid Upon being picked up by the over-head pick-up wheel, the hose is transported to the cover extruder and thereafter to an open steam curing chamber.
It is contemplated that various changes may be made to the apparatus without departing from the scope of the appended claims For example, the roller pairs 36, 38 may be mounted vertically with respect to the braider deck plate 24 In this circumstance, other mounting means may be available or applied to the braider without any adverse affects on its operation Further, it is anticipated that a pair of flat plates 52, 54 may be positioned between the roller pairs 36, 38 such as to maintain the axial orientation of the wire bundle between the rollers.
These plates are shown in Figure 3 with the top plate 54 being partially broken away to show the expanded conductor in its position between the rollers 36, 38 The plates, while maintaining the axial position of the wire, facilitate spreading of the conductor in the directions transverse to the axial direction and also initial threading of the conductor through the apparatus 30.
It will be appreciated that the drive arrangements of the rollers and the take-up wheel are such that the expanded and flattened conductor leaves the second pair of rollers 38 at the same speed as the hose core tube is drawn through the braider.
Thus, the static conductor is continuously applied to the core tube in a fast, efficient, economical and automated manner 70
Claims (15)
WHAT WE CLAIM IS:-
1 A method of manufacturing a hose incorporating a conductor of static electricity comprising the steps of extruding an elastomeric tube; pressurizing the tube to 75.
effect a substatially rounded cross-section; shortening a loosely braided wire bundle in its axial direction so that the individual wires of the bundle each become increasingly sinusoidal; compressing the shortened wire 80 bundle in a direction transversely of its axis to flatten and form a conductor; laying the conductor onto the elastomeric tube parallel to the tube axis; wrapping the tube with a textile material to hold the conductor in 85 position on the tube; extruding a cover of elastomeric material over the wrapped tube to form an integral hose structure; and curing the hose structure.
2 A method as claimed in claim 1 90 wherein the textile material is braided,
3 A method as claimed in claim 1 wherein the textile material is helically wound around the tube having the conductor laid parallel to its axis 95
4 A method as claimed in any of claims 1 to 3 wherein the bundle is shortened by two pairs of rollers, the first of the pairs being rotated at a speed faster than the second of the pairs so that the bundle is 100 shortened in its axial direction between the pairs of rollers.
A method as claimed in claim 4 wherein the shortened wire bundle is flattened by compression between the second 105 pair of rollers.
6 A method as set forth in claim 5 wherein the shortened and flattened conductor is laid onto the tube just prior to the braid point of a braiding machine such that a 110 minimum of wire elongation is effected prior to its being overlaid with the textile braid.
7 Hose manufacturing apparatus comprising a first extruder for extruding an 115 elastomeric tube, means for pressurising the tube to effect a substantially rounded crosssection; means for supplying a loosely braided wire bundle; means for shortening the loosely braided wire bundle in its axial 120 direction, so that the individual wires of the bundle each becomes increasingly sinusoidal and for compressing the shortened wire bundle in a direction transversely of its axis to flatten and form a conductor; the first 125 extruder, the supply means, the means for shortening the wire bundle, and for compressing the shortened wire bundle being positioned so that the conductor is laid onto the elastomeric tube parallel to the axis of 130 1 SRI qni 4 4 the tube; wrapping means for wrapping the tube with a textile material to hold the conductor in position on the tube; and a second extruder for extruding a cover of an elastomeric material over the wrapped tube to form an integral structure.
8 Hose manufacturing apparatus as claimed in claim 7 wherein the means for shortening and compressing the wire bundle comprise first driven means positioned to draw the wire bundle from the supply means for supplying the wire bundle; and second driven means mounted adjacent to the first driven means and to the extruded tube so as to receive the wire bundle from the first driven means, the first driven means being driven at a speed faster than that of the second driven means so as to shorten the bundle in the axial direction between the first and second driven means, the second driven means also serving to compress the axially shortened bundle to flatten the bundle transversely of its axis into the conductor.
9 Hose manufacturing apparatus as claimed in claim 8 wherein the first and second driven means each comprise a pair of rollers.
Hose manufacturing apparatus as claimed in claim 9 wherein the wrapping means comprise a vertical braider, the pairs of rollers being mounted on the vertical braider.
11 Hose manufacturing apparatus as claimed in claim 9 wherein the wrapping means comprises a helical wrapper, the pairs of rollers being mounted on the wrapper.
12 Hose manufacturing apparatus as claimed in any of claims 9 to 11 comprising a pair of flat parallel plates mounted between the pairs of rollers so that the wires of the bundle while the bundle is being compressed in its axial direction are forced to move transversely of the bundle axis between the two plates.
13 A method of manufacturing a hose substantially as hercinbefore described with reference to Figures 3 and 4 of the accompanying drawings.
14 Hose manufacturing apparatus substantially as hereinbefore described with reference to Figures 3 and 4 of the accompanying drawings.
15 A hose manufactured by a method as claimed in any of claims 1 to 6 and 13 or by apparatus as claimed in any of claims 7 to 12 and 14.
MARKS & CLERK Printed for Her N Majest Cy Stationer 5 Office, by Croidon Printing Compans I,miced Cromdon Surrey 1980.
Published by The Patent Office, 25 Southampton Buildings, London W C 2 A IAY from which copies may be obtained.
GB20405/78A
1977-06-01
1978-05-18
Method and apparatus for manufacturing hose
Expired
GB1582503A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US05/802,404
US4108701A
(en)
1977-06-01
1977-06-01
Method for making hose incorporating an embedded static ground conductor
Publications (1)
Publication Number
Publication Date
GB1582503A
true
GB1582503A
(en)
1981-01-07
Family
ID=25183608
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Application Number
Title
Priority Date
Filing Date
GB20405/78A
Expired
GB1582503A
(en)
1977-06-01
1978-05-18
Method and apparatus for manufacturing hose
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US
(1)
US4108701A
(en)
JP
(1)
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(en)
AR
(1)
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AT
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AU
(1)
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BR
(1)
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CA
(1)
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DE
(1)
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DK
(1)
DK242178A
(en)
FR
(1)
FR2403505A1
(en)
GB
(1)
GB1582503A
(en)
IT
(1)
IT1095173B
(en)
MX
(1)
MX145577A
(en)
SE
(1)
SE440045B
(en)
ZA
(1)
ZA782479B
(en)
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DE2237561A1
(en)
*
1972-07-31
1974-02-21
Continental Gummi Werke Ag
Electrically conductive tubing for fuels - with conductive strips flexibly embedded in layer structure
FR2309190A1
(en)
*
1975-04-29
1976-11-26
Mauz & Pfeiffer Progress
Suction hose with built-in electric conductors for vacuum cleaners - mfrd. in one step by extrusion has guide ducts for the conductors
1977
1977-06-01
US
US05/802,404
patent/US4108701A/en
not_active
Expired - Lifetime
1978
1978-02-21
CA
CA297,415A
patent/CA1083795A/en
not_active
Expired
1978-04-27
DE
DE2818865A
patent/DE2818865C2/en
not_active
Expired
1978-04-28
AT
AT0311978A
patent/AT368445B/en
not_active
IP Right Cessation
1978-05-01
ZA
ZA00782479A
patent/ZA782479B/en
unknown
1978-05-04
AU
AU35765/78A
patent/AU514880B2/en
not_active
Expired
1978-05-18
GB
GB20405/78A
patent/GB1582503A/en
not_active
Expired
1978-05-26
BR
BR787803350A
patent/BR7803350A/en
unknown
1978-05-30
MX
MX173607A
patent/MX145577A/en
unknown
1978-05-30
SE
SE7806272A
patent/SE440045B/en
not_active
IP Right Cessation
1978-05-30
AR
AR272386A
patent/AR218915A1/en
active
1978-05-30
IT
IT24010/78A
patent/IT1095173B/en
active
1978-05-31
DK
DK242178A
patent/DK242178A/en
not_active
Application Discontinuation
1978-05-31
JP
JP53065583A
patent/JPS5931927B2/en
not_active
Expired
1978-06-01
FR
FR7816384A
patent/FR2403505A1/en
active
Granted
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2258940A
(en)
*
1991-08-17
1993-02-24
Lin Lieh Chao
Electrical cable
Also Published As
Publication number
Publication date
DE2818865C2
(en)
1985-01-31
FR2403505A1
(en)
1979-04-13
AU3576578A
(en)
1979-11-08
DK242178A
(en)
1978-12-02
AR218915A1
(en)
1980-07-15
CA1083795A
(en)
1980-08-19
DE2818865A1
(en)
1978-12-14
US4108701A
(en)
1978-08-22
AT368445B
(en)
1982-10-11
JPS5931927B2
(en)
1984-08-06
FR2403505B1
(en)
1983-04-29
IT7824010D0
(en)
1978-05-30
ZA782479B
(en)
1979-04-25
SE440045B
(en)
1985-07-15
BR7803350A
(en)
1979-01-16
JPS5410382A
(en)
1979-01-25
IT1095173B
(en)
1985-08-10
SE7806272L
(en)
1978-12-02
AU514880B2
(en)
1981-03-05
ATA311978A
(en)
1982-02-15
MX145577A
(en)
1982-03-08
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Legal Events
Date
Code
Title
Description
1981-03-25
PS
Patent sealed [section 19, patents act 1949]
1989-01-11
PCNP
Patent ceased through non-payment of renewal fee
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