GB2119744A - Indicating devices for use with heat-sealable fittings for making connections to heat-sealable tubing or pipes - Google Patents

Indicating devices for use with heat-sealable fittings for making connections to heat-sealable tubing or pipes Download PDF

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Publication number
GB2119744A
GB2119744A GB08213683A GB8213683A GB2119744A GB 2119744 A GB2119744 A GB 2119744A GB 08213683 A GB08213683 A GB 08213683A GB 8213683 A GB8213683 A GB 8213683A GB 2119744 A GB2119744 A GB 2119744A
Authority
GB
United Kingdom
Prior art keywords
coupling device
apertures
fitting
heat
sealable
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Withdrawn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
GB08213683A
Inventor
Albert Keith Bunn
Alan Johnson
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.)
British Gas Corp
Original Assignee
British Gas Corp
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 British Gas Corp filed Critical British Gas Corp
Priority to GB08213683A priority Critical patent/GB2119744A/en
Publication of GB2119744A publication Critical patent/GB2119744A/en
Withdrawn legal-status Critical Current

Links

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
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/02—Welded joints; Adhesive joints
    • F16L47/03—Welded joints with an electrical resistance incorporated in the joint
    • 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
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • 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
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings
    • 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
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/967—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving special data inputs or special data outputs, e.g. for monitoring purposes
    • B29C66/9672—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving special data inputs or special data outputs, e.g. for monitoring purposes involving special data inputs, e.g. involving barcodes, RFID tags
    • 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
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time

Abstract

An indicating device for use with a heat-sealable fitting comprises an annulus 2 of magnetic material arranged to fit over a locating member on the heat-sealable fitting and having at least one upstanding arm 3 also of magnetic material. The or each arm 3 is provided with apertures 7 arranged in a predetermined pattern so that leakage flux produced by the apertures provides an identification of the fitting. The predetermined pattern of apertures 7 may represent a binary code. A further pattern of apertures 10 may produce leakage flux which provides a clocking signal. The device may be secured to a polyethylene sleeve 5 integral with the heat- sealable fitting. <IMAGE>

Description

SPECIFICATION Coupling devices for use with heat-sealable fittings for making connections to heatsealable tubing or pipes Technical Field of the Invention This invention relates to coupling devices for use with heat-sealable fittings to provide an indication of the period of time for which such fittings should be electrically energised to provide a satisfactory connection to heat-sealable tubing or pipes.
Background Art In the installation of service pipes for the supply of fluids it is known to place over the ends of two lengths of pipe of heat-sealable material a tubular jointing fitting of heat-sealable material with an integral electrical heating wire and to energise the heating wire so that the material of the fitting forms a bond with the material of the two pipes.
With such heat-sealable fittings it is important that the energising current is applied for the optimum time necessary to effect a perfect seal since applying the current for too short a time may result in a leakage joint while applying the current for too long a time may overheat and damage the fitting and also result in an unsatisfactory joint.
In practice the heat-sealable fittings for use in quite different conditions and requiring quite different periods of energisation may be similar in appearance and therefore it is important that there is a reliable method of identifying them so that the correct energisation period can be used and so that the energisation can be carried out automatically.
An object of this invention is to provide a coupling device for use with a heat-sealable fitting to provide positive identification thereof.
According to the present invention a coupling device for use with a heat-sealable fitting comprises an annulus of magnetic material arranged to fit over a locating member on the heat-sealable fitting and having at least one upstanding arm also of magnetic material provided with apertures in a predetermined pattern so that leakage flux produced by the apertures provides an identification of the heatsealable fitting.
In the preceding paragraph and throughout the remainder of this specification the term "heatsealable fitting" is used to connote not only fittings of suitable plastics materials but also fittings of low melting point metals and other materials with which a fluid-tight bond can be produced by the application of heat.
The predetermined pattern of apertures may represent a binary code which provides the identification of the heat-sealable fitting.
The arm may have a further pattern of apertures arranged to produce leakage flux which provides a clocking signal.
The coupling device may have two upstanding arms located at diametrically opposite positions on the annulus, each upstanding arm being provided with the predetermined pattern of apertures, with or without the further pattern of apertures.
The coupling device may be arranged to fit over a locating member in the form of an electrical connector through which energising current is supplied to the fitting, and may be used in combination with a plug which cooperates with the electrical connector for the supply of energising current and is provided with means for producing a magnetic field and with means for detecting the leakage flux.
The means for producing a magnetic field may be a permanent magnet and the means for detecting the leakage flux may be a Hall-effect probe.
In one embodiment of the invention the coupling device is arranged so that the connecting together of the plug and the electrical connector when the coupling device is fitted produces an electrical output signal identifying the heatsealable fitting.
The electrical output signal which is produced in this embodiment of the invention may be clocked by a clocking signal produced by leakage flux produced by the further pattern of apertures and is indicative of a binary number identifying the heat sealable fitting.
Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings.
Brief Description of the Drawings Figure 1 is a perspective view of a coupling device in accordance with the invention; Figure 2 is a fragmentary plan view of a heatsealable fitting with the coupling device fitted over an electrical connector which supplies energising current thereto; and Figure 3 is a fragmentary side elevation of the heat-sealable fitting shown in Figure 2 with the coupling device and electrical connector shown in cross-section.
Best modes for carrying out the invention Referring in the first instance to Figure 1, the coupling device 1 comprises an annulus 2 of magnetic material having two arms 3, also of magnetic material, integral therewith and upstanding from its upper surface 4. The arms 3, which are substantially rectangular in configuration, are located at diametrically opposite positions on the annulus 2. The arms 3 and the annulus 2 are secured to a substantially cylindrical sleeve 5 of electrically insulating material, for example a plastics material such as polyethylene. Preferably the sleeve 5 is moulded to the arms 3 and the annulus 2 to secure it thereto.
Each end of the arms 3 is provided with a plurality of apertures 7 which extend through the thickness of the arm and are arranged in a predetermined pattern so that leakage flux produced by the apertures 7 can provide an identification of a heat-sealable fitting to be described later. In Figure 1 the apertures 7 are arranged in a substantially vertical row in which the presence or absence of an aperture 7 in the row represents a binary code. Typically the presence of an aperture 7 represents a binary dig tt "1" and the absence of an aperture, as at the positions 8, represents a binary digit "0".
When the coupling device 1 is placed in a magnetic field the presence of an aperture 7 will cause local perturbations in the magnetic field and some of the lines of magnetic flux will leak into the surrounding space. This leakage flux can be detected by a d.c. type of magnetic field detector, for example a Hall-effect probe or a magnetic diode, arranged to provide an electrical output signal indicative of the binary digits. A d.c. type of magnetic field detector is used in circumstances when a predetermined rate of relative movement between the apertures 7 and the detector cannot be guaranteed.
If a predetermined rate of relative movement between the apertures 7 and the magnetic field detector is possible then each of the arms 3 is provided with a plurality of further apertures 10 arranged so that leakage flux produced by the apertures 10 can provide a clocking signal. In Figure 1 the apertures 10 are arranged in a substantially vertical row each aperture 10 being located in a position corresponding to the position of an aperture 7 or in a position corresponding to a position 8 from which an aperture 7 is absent Relative movement between the apertures 7 and the magnetic field enables the leakage flux produced by the apertures 10 to provide a train of clocking signals indicative of the instants during which the binary digits can be read by the magnetic field detector.
Turning now to Figures 2 and 3, the heatsealable fitting 12 comprises a tubular member 14 of thermoplastic material having an electrical heater winding 1 5 embedded therein. An electrical connector 16, whose peripheral wall is formed by the sleeve 5, is mounted on the tubular member 14 and has an electrical terminal 17 to which the heater winding 1 5 is connected for the supply of energising current thereto. Typically, the sleeve 5 would be moulded integral with the tubular member 14. The electrical connector 16 thus forms the locating member over which the annulus 2 of the coupling device 1 is fitted.
A plug 19, shown in chain line in the Figures, carries a socket 20 which cooperates with the electrical terminal 17 for the supply of energising current to the heater winding 15. The arms 3 act as keyways for the location of the plug 1 9 on the electrical connector. The plug 19 carries a permanent magnet 21 which lies in close proximity with one of the arms 3 when the plug 19 is connected to the electrical connector 16 and which provides a magnetic field. The plug 19 also carries two Hall-effect probes 22 and 23 which lie in close proximity with the other arm 3 so that they cooperate with the apertures 7 and 10 respectively.
When the coupling device 1 is fitted over the electrical connector 16 the connection of a plug 19 thereto will cause the probe 22 to produce an electrical output signal which identifies the particular type of heat-sealable fitting 12. The permanent magnet 21 produces a magnetic field which permeates the annulus 2 and the arms 3.
The leakage flux produced by the apertures 10 is detected by the probe 23 which provides a train of clocking signals indicative of the instants during which the leakage flux produced by the apertures 7 can be detected. Consequently the probe 23 produces an output signal indicative of a binary number identifying the heat-sealable fitting.
It is envisaged that batches of coupling devices would be manufactured each batch of which is unique to a particular type of heat-sealable fitting so that they would only be fitted to a heat-sealable fitting of that particular type. The probes 22 and 23 could then be connected to circuit arrangements providing a visual display of the output signal either in binary or decimal form.
Once the heat-sealable fitting has been identified the energising current could then be applied for the optimum time necessary for the fitting which has been identified, and would preferably be applied automatically under the control of the circuit arrangement.
It will be appreciated that the coupling member 1 is symmetrical so that the plug 19 could be fitted either way round. I However, it is not essential that the coupling member is symmetrical or that it should have two arms. A single arm or more than two arms could be used depending on the geometry of the magnetic field detector and the arrangement for producing the magnetic field.

Claims (12)

1. A coupling device for use with a heatsealable fitting comprises an annulus of magnetic material arranged to fit over a locating member on the heat-sealable fitting and having at least one upstanding arm also of magnetic material provided with apertures in a predetermined pattern so that leakage flux produced by the apertures provides an identification of the heatsealable fitting.
2. A coupling device as claimed in Claim 1, wherein the predetermined pattern of apertures represents a binary code which provides the identification of the heat-sealable fitting.
3. A coupling device as claimed in Claim 1 or Claim 2, wherein the arm has a further pattern of apertures arranged to produce leakage flux which provides a clocking signal.
4. A coupling device as claimed in any preceding claim, having two upstanding arms located at diametrically opposite positions on the annulus, each upstanding arm being provided with the predetermined pattern of apertures, with or without the further pattern of apertures.
5. A coupling device as claimed in any preceding claim, arranged to fit over a locating member in the form of an electrical connector through which energising current is supplied to the fitting, and in combination with a plug which cooperates with the electrical connector for the supply of energising current and is provided with means for producing a magnetic field and with means for detecting the leakage flux.
6. A coupling device as claimed in Claim 5, wherein the means for producing a magnetic field is a permanent magnet.
7. A coupling device as claimed in Claim 5 or Claim 6, wherein the means for detecting the leakage flux is a Hall-effect probe.
8. A coupling device as claimed in any one of Claims 5 to 7, arranged so that the connecting together of the plug and the electrical connector when the coupling device is fitted produces an electrical output signal identifying the heatsealable fitting.
9. A coupling device as claimed in Claim 8, arranged so that the electrical output signal which is produced comprises a train of binary signals.
10. A coupling device as claimed in Claim 8 or Claim 9, arranged so that the electrical output signal which is produced is clocked by a clocking signal produced by leakage flux produced by the further pattern of apertures and is indicative of a binary number identifying the heat-sealable fitting
11. A coupling device substantially as hereinbefore described with reference to Figure 1 of the accompanying drawings.
12. A coupling device substantially as hereinbefore described with reference to Figures 2 and 3 of the accompanying drawings.
GB08213683A 1982-05-11 1982-05-11 Indicating devices for use with heat-sealable fittings for making connections to heat-sealable tubing or pipes Withdrawn GB2119744A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08213683A GB2119744A (en) 1982-05-11 1982-05-11 Indicating devices for use with heat-sealable fittings for making connections to heat-sealable tubing or pipes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08213683A GB2119744A (en) 1982-05-11 1982-05-11 Indicating devices for use with heat-sealable fittings for making connections to heat-sealable tubing or pipes

Publications (1)

Publication Number Publication Date
GB2119744A true GB2119744A (en) 1983-11-23

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2572326A1 (en) * 1984-10-31 1986-05-02 Gaz De France Process and machine for automatically welding plastic components including an integrated winding (coil)
EP0189918A2 (en) * 1985-01-29 1986-08-06 E.I. Du Pont De Nemours And Company Heat-fusion pipe fitting system
EP0272978A1 (en) * 1986-12-23 1988-06-29 Gaz De France Method to control the elevation of the temperature of electrically heated parts
EP0343251A4 (en) * 1987-10-22 1990-02-26 Mitsui Petrochemical Ind Electrofusion joint.
WO1994026502A1 (en) * 1993-05-10 1994-11-24 Wavin B.V. Electric plug connector for thermoplastic electric welding sleeves
WO2005064224A1 (en) * 2003-12-29 2005-07-14 Nam-Hoon Lee Power supplier with multiterminals for electrofusion socket

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2572326A1 (en) * 1984-10-31 1986-05-02 Gaz De France Process and machine for automatically welding plastic components including an integrated winding (coil)
EP0189918A2 (en) * 1985-01-29 1986-08-06 E.I. Du Pont De Nemours And Company Heat-fusion pipe fitting system
EP0189918A3 (en) * 1985-01-29 1987-06-24 E.I. Du Pont De Nemours And Company Heat-fusion pipe fitting system
EP0272978A1 (en) * 1986-12-23 1988-06-29 Gaz De France Method to control the elevation of the temperature of electrically heated parts
FR2609933A1 (en) * 1986-12-23 1988-07-29 Gaz De France METHOD FOR DRIVING AND CONTROLLING THE TEMPERATURE RAISING OF ELECTRICALLY HEATED PARTS
EP0343251A4 (en) * 1987-10-22 1990-02-26 Mitsui Petrochemical Ind Electrofusion joint.
US4994655A (en) * 1987-10-22 1991-02-19 Mitsui Petrochemical Industries, Ltd. Electro-fusion joint
WO1994026502A1 (en) * 1993-05-10 1994-11-24 Wavin B.V. Electric plug connector for thermoplastic electric welding sleeves
WO2005064224A1 (en) * 2003-12-29 2005-07-14 Nam-Hoon Lee Power supplier with multiterminals for electrofusion socket

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