GB2057084A - Installation of a cable, conduit or the like elongate element in a mounting - Google Patents

Installation of a cable, conduit or the like elongate element in a mounting Download PDF

Info

Publication number
GB2057084A
GB2057084A GB8023753A GB8023753A GB2057084A GB 2057084 A GB2057084 A GB 2057084A GB 8023753 A GB8023753 A GB 8023753A GB 8023753 A GB8023753 A GB 8023753A GB 2057084 A GB2057084 A GB 2057084A
Authority
GB
United Kingdom
Prior art keywords
sheath
mandrel
mounting
cable
conduit
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.)
Withdrawn
Application number
GB8023753A
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.)
Airbus Defence and Space GmbH
Original Assignee
Messerschmitt Bolkow Blohm AG
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.)
Filing date
Publication date
Application filed by Messerschmitt Bolkow Blohm AG filed Critical Messerschmitt Bolkow Blohm AG
Publication of GB2057084A publication Critical patent/GB2057084A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/66—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined
    • B29C65/68—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined using auxiliary shrinkable elements
    • 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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/04—Thermal expansion
    • 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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06—Making preforms having internal stresses, e.g. plastic memory
    • B29C61/08—Making preforms having internal stresses, e.g. plastic memory by stretching tubes
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/526—Joining bars
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • B29C66/5324—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length
    • B29C66/53241—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length said articles being tubular and said substantially annular single elements being of finite length relative to the infinite length of said tubular articles
    • 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
    • F16L5/00—Devices for use where pipes, cables or protective tubing pass through walls or partitions
    • F16L5/02—Sealing
    • F16L5/10—Sealing by using sealing rings or sleeves only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/08—Distribution boxes; Connection or junction boxes
    • H02G3/081—Bases, casings or covers
    • H02G3/083—Inlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7172—Fuel tanks, jerry cans

Abstract

An elongate element (2) such as an electrical or control cable or a conduit can be mounted in an aperture (3) in a flange (4) by means of a sheath (5) of a resilient, thermoplastic heat-recoverable material. The sheath (5) is heated, axially extended and then cooled while on a mandrel (not shown) of similar dimensions to the element (2), after which the extended sheath (5) is located on the element (2) within the aperture (3) and then reheated so that in resuming its former shape the sheath (5) contracts axially and expands radially, filling the gap between the element (2) and the aperture (3) and forming beads on opposite sides of the flange (4). A single sheath, expanded on a mandrel, can be sub-divided to provide sections locatable in respective apertures (3) at intervals spaced along the length of the element (2). On the mandrel the sheath is preferably extended by 50% of its former length while at a temperature in the range 200 DEG C- 250 DEG C. <IMAGE>

Description

SPECIFICATION An improved method for the installation of a cable, conduit or the like elongated element in a mounting therefor Description This invention relates to an improved method for the installation of a cable, such as an electrical or control cable, conduit or the like elongated element in a mounting therefor, such as an apertured flange of a bulkhead or like partition of a vehicle, machine building or other structure or installation in which the element is to be incorporated.
It is known to provide an electric cable, by which is meant an individual wire or bundle of wires, with an outer sheath to protect it from mechanical damage at the mountings which support it at intervals along its length. To avoid displacement of the sheath along the cable away from the mounting points, either as the cable is pulled into position through the mountings or because of the vibration of the machine or vehicle in which the cable is installed, it has been proposed to provide a cable with a sheath which is shrunk in situ so that it tightly grips the cable and resists relative longitudinal displacement.
Shirnkage of the sheath is effected by heating it to between 2000C and 2500C after location around the cable and either before or after installation of the cable in its mountings.
However, the shrunk-on sheath serves purely to protect the cable against mechanical damage and does not in itself facilitate the securement of the cable at intervals along its length to mountings therefor, such as apertures in flanges or bulkheads of a machine or vehicle. Such securement is frequently a difficult operation if, for example, a cable, control rod conduit or the like flexible, elongated element is to follow a sinuous course through, for example, an airframe where the available space and access to it is severely restricted by the presence of obstructions such as an already installed fuel tank.
An object of the present invention is to facilitate the insertion and securement of an elongated element in mounting means therefor even when the available space and access to it is restricted, without detriment to the mounting means or the working life of the assembly.
In accordance with the present invention there is provided a method for the installation of a cable, conduit or the like elongated element in a mounting therefor, the method comprising locating on a mandrel of similar cross-sectional dimensions to the element a sheath of a resilient, thermoplastic material which has the properties of setting when cooled but resuming, when heated, a former shape from which it has been deformed, heating and axially extending and then cooling the sheath while on the mandrel so that the sheath retains its axially extended condition when removed from the mandrel, locating the sheath around the element and within the mounting and radial expansion simultaneously with axial contraction.
A single sheath may be divided, while in the axially extended condition, into a plurality of sections which are located around the element at .intervals along the length of the latter within respective mountings and then subjected to heat so that each section tends to engage the associated mounting.
While on the mandrel the sheath is preferably subjected to heat in the range 200 C~250 C and axial extension of up to 50% of its original length.
When the or each mounting is an aperture in a member which is thinner than the associated sheath or sheath section is long the latter may be located to project from opposite sides of the member before being subjected to heat, the arrangement being such that when the sheath or sheath section undergoes radial expansion and axial contraction it forms beads on opposite sides of the member adjacent the aperture. A grommet or lining equivalent to a grommet may be positioned in the aperture before the insertion therethrough of the sheath or sheath section.
A preferred embodiment of the invention will now be described with reference to the accompanying drawings, in which:~ Figure 1 illustrates a cable or conduit following a sinuous course within a restricted space, Figure 2 shows a straight cable or conduit, Figure 3 is a view taken on the line II I-Ill of Figure 1, and Figure 4 is a sectional elevation on an enlarged scale taken on the line lV-lV of Figure 3.
Figures 1 and 2 each show a cable, conduit or the like flexible, elongated element 2 which is supported within a structure such as an airframe at intervals along the length of the element being passed in succession through holes 3 in spaced-apart bulkheads or partitions, or flanges 4 secured thereto. In the case of Figure lit will be seen that the available space for the sinuous element 2 is restricted by an airframe member 1 which also obstructs access to the mounting flanges 4 of the element 2.
In accordance with the present invention there is located around the element 2 to extend through each hole 3 a sheath 5 of a resilient, thermoplastic material of a kind which, if deformed while heated and cooled in the deformed state will maintain the latter until again subjected to heat, whereupon it will resume its former shape. Examples of suitable resilient thermoplastic materials are those used for the shrunk sheath discussed in the preamble of this Specification. Prior to insertion around the element 2 each sheath 5 has been located on a mandrel (not shown) and while heated to between 2000C and 2500C stretched by a factor of approximately 50% of its original length. While still on the mandrel the sheath is cooled so that on removal from the mandrel and initial insertion on the element 2 the sheath 5 retains its axially extended condition.After location of the cable or conduit 2 in the holes 3 so that a sheath 5 projects through each hole 3 from opposite sides of the flange 4 in which the hole is formed each sheath 5 is heated, in situ, to between 2000C and 2500C so that it tends to resume its former shape, and while axially contracting it expands radially both to grip the element 2 and fill the gap between the latter and the periphery of the hole 3. At the same time, the thickening of the sheath 5 combined with its axial contraction causes it to form annular beads on opposite sides of and closely adjacent to the flange 4, as may be seen in Figure 4.
Thus the sheath 5 adopts the shape of a grommet, but the sharp edge of the hole 3 in a thin metal flange 4 may additionally be protected by another grommet or lining 6.
In a preferred form of the invention the sheaths 5 are not individually made but, when inserted on the element 2 and prior to heating in situ, they are sections of a single sheath which has been subdivided along its length after axial extension and cooling on a mandrel.

Claims (7)

1. A method for the installation of a cable, conduit or the like elongated element in a mounting therefor, the method comprising locating on a mandrel of similar cross-sectional dimensions to the element a sheath of a resilient, thermoplastic material which has the properties of setting when cooled but resuming, when heated, a former shape from which it has been deformed, heating and axially extending and then cooling the sheath while on the mandrel so that the sheath retains its axially extended condition when removed from the mandrel, locating the sheath around the element and within the mounting and then heating the sheath so that it tends to undergo radial expansion simultaneously with axial contraction.
2. The method claimed in claim 1, wherein a single sheath is divided, while in the axially extended condition, into a plurality of sections which are located around the element at intervals along the length of the latter within respective mountings and then subjected to heat so that each section tends to engage the associated mounting.
3. The method claimed in claim 1 or claim 2, wherein while on the mandrel the sheath is subjected to heat in the range 2000C - 2500C and axial extension of up to 50% of its original length.
4. The method claimed in any one of the preceding claims wherein the or each mounting is an aperture in a member which is thinner than the associated sheath or sheath section is long and the latter is located to project from opposite sides of the member before being subjected to heat, the arrangement being such that when the sheath or sheath section undergoes radial expansion and axial contraction it forms beads on opposite sides of the member adjacent the aperture.
5. The method claimed in claim 4, wherein a grommet or lining equivalent to a grommet is positioned in the aperture before the insertion therethrough of the sheath or sheath section.
6. A method as claimed in claim 1 for the installation of a cable, conduit or the like elongated element in a mounting therefor substantially as hereinbefore described.
7. The installation of a cable, conduit or the like elongated element in a mounting therefor substantially as hereinbefore described with reference to the accompanying drawings.
GB8023753A 1979-08-08 1980-07-21 Installation of a cable, conduit or the like elongate element in a mounting Withdrawn GB2057084A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792932088 DE2932088A1 (en) 1979-08-08 1979-08-08 METHOD FOR TREATING A RING OR TUBULAR ELASTIC HOLDING ELEMENT FOR FIXING PIPELINES AND THE LIKE. MACHINE PARTS IN DEVICES, MACHINES OR THE LIKE, IN PARTICULAR AIRPLANES

Publications (1)

Publication Number Publication Date
GB2057084A true GB2057084A (en) 1981-03-25

Family

ID=6077890

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8023753A Withdrawn GB2057084A (en) 1979-08-08 1980-07-21 Installation of a cable, conduit or the like elongate element in a mounting

Country Status (4)

Country Link
DE (1) DE2932088A1 (en)
FR (1) FR2463310A1 (en)
GB (1) GB2057084A (en)
IT (1) IT1132279B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2120788A (en) * 1982-04-15 1983-12-07 Leuven Res & Dev Vzw Shape memory member
US4901395A (en) * 1989-02-27 1990-02-20 General Motors Corporation Self-sealing heat activated grommet
WO2004055333A1 (en) * 2002-12-17 2004-07-01 Pratt & Whitney Canada Corp. Grommeted bypass duct penetration
US7921694B2 (en) 2005-10-12 2011-04-12 Airbus Deutschland Gmbh Leak detector and detection method using radiation transmitted through a fluid line

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB607828A (en) * 1945-04-03 1948-09-06 Us Rubber Co Improvements in plastic rivets and method of making same
GB652054A (en) * 1948-03-25 1951-04-18 British Mechanical Prod Ltd A new or improved method of securing two interfitting parts together and/or of obtaining a seal between two interfitting connected parts
GB785479A (en) * 1954-05-03 1957-10-30 Connecticut Hard Rubber Co Improvements in or relating to teflon hermetic seal
US2994933A (en) * 1956-04-04 1961-08-08 Sheemon A Wolfe Grommet
US3518359A (en) * 1968-03-28 1970-06-30 Amp Inc Heat-shrinkable sealing and strain-relief fittings for electrical cables
GB1588722A (en) * 1976-10-01 1981-04-29 Raychem Ltd Feedthrough device
US4178067A (en) * 1978-01-19 1979-12-11 Amp Incorporated Splicing optic waveguides by shrinkable means

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2120788A (en) * 1982-04-15 1983-12-07 Leuven Res & Dev Vzw Shape memory member
US4901395A (en) * 1989-02-27 1990-02-20 General Motors Corporation Self-sealing heat activated grommet
WO2004055333A1 (en) * 2002-12-17 2004-07-01 Pratt & Whitney Canada Corp. Grommeted bypass duct penetration
US6942452B2 (en) 2002-12-17 2005-09-13 Pratt & Whitney Canada Corp. Grommeted bypass duct penetration
US7921694B2 (en) 2005-10-12 2011-04-12 Airbus Deutschland Gmbh Leak detector and detection method using radiation transmitted through a fluid line
US8365581B2 (en) 2005-10-12 2013-02-05 Airbus Operations Gmbh Valve for a leak detector

Also Published As

Publication number Publication date
IT1132279B (en) 1986-07-02
IT8023866A0 (en) 1980-08-01
FR2463310A1 (en) 1981-02-20
DE2932088A1 (en) 1981-02-26

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)