GB2038436A - Device for Joining Plastics Pipe Sections - Google Patents

Device for Joining Plastics Pipe Sections Download PDF

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Publication number
GB2038436A
GB2038436A GB7939342A GB7939342A GB2038436A GB 2038436 A GB2038436 A GB 2038436A GB 7939342 A GB7939342 A GB 7939342A GB 7939342 A GB7939342 A GB 7939342A GB 2038436 A GB2038436 A GB 2038436A
Authority
GB
United Kingdom
Prior art keywords
clamp means
fixed clamp
pressure
pipe sections
pipe section
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
Application number
GB7939342A
Other versions
GB2038436B (en
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.)
HAXEY ENG Ltd
Original Assignee
HAXEY ENG Ltd
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 HAXEY ENG Ltd filed Critical HAXEY ENG Ltd
Priority to GB7939342A priority Critical patent/GB2038436B/en
Publication of GB2038436A publication Critical patent/GB2038436A/en
Application granted granted Critical
Publication of GB2038436B publication Critical patent/GB2038436B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • 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
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • 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
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt 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
    • B29C66/50—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
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • 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
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/922—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9221—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force or the mechanical power
    • 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
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9241—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power
    • 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
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/929—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools characterized by specific pressure, force, mechanical power or displacement values or ranges
    • 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
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

Abstract

A device for fusion jointing of thermoplastics pipe sections includes fixed clamp means for holding one of the pipe sections and movable clamp means for holding the other. A pressure responsive device is mounted on the fixed clamp means so that an indication of the pressure being applied to the pipe sections being joined together may be given. This pressure does not include a contribution from the force to move the pipe section held by the movable clamp and is therefore more directly useful to the operator.

Description

SPECIFICATION Device for Joining Plastics Pipe Sections This invention relates to the joining together of plastics pipe sections, the term pipe sections being intended to include pipe fittings as well as lengths of pipe.
Reference will be made hereinafter to the joining together of pipe sections coaxially, but it should be understood that the invention is applicable to the joining together of pipe sections at an angle of from 0 to 900.
Butt fusion devices are known which are operated pneumatically, hydraulically or mechanically by means of a lever. With such devices one pipe section remains stationary and is held by a fixed clamp means and the other pipe section is located in movable clamp means, the clamp means being mounted on a common frame. A heater element is located between the faces of the pipe sections and the device operated so that the movable clamp means and the heater move until the opposite faces of the heating element contact the pipe faces. After the heating stage the heating element is removed and the movable clamp means moved towards the stationary clamp means until the pipe faces are in contact. The device includes pressure measuring means (for instance, a pressure gauge or a device giving a scale indication against spring pressure) which records the pressure exerted on the movable clamp.However, such pressure measuring means records the total of the fusion pressure and the friction drag pressure involved in moving the pipe sections held by the movable clamp. When several lengths of pipe are to be joined the additional load is considerable.
Accordingly the operator needs to add the additional load to the required jointing pressure in order to operate the device at the correct pressure.
According to the present invention there is provided a device for fusion jointing of thermoplastics pipe sections comprising fixed clamp means to hold a first pipe section and movable clamp means to hold a second pipe section, the fixed clamp means being provided with means responsive to and for indicating the pressure applied to the first pipe section by the section during the fusion jointing process.
Accordingly by locating pressure indicating means on the fixed clamp means it is not necessary to take account of the friction or drag pressure and the procedure is considerably simplified.
Preferably the device is a lever operated machine, for instance a lever with a ratchet mechanism so that a constant pressure can be maintained when the correct pressure has been reached. The fixed clamp means (or indeed the frame itself to which the fixed clamp means is attached) is provided with a pressure responsive device providing a visual indication of the pressure being applied to the face of the pipe section being held by the fixed clamp means.
The pressure responsive device may be any suitable device and may, for instance, be a device utilising a piezoelectric effect. The device may include means for translating the applied load electronically into an easily read signal such as pipe diameter or different coloured indications on illuminated diodes. In the latter case a row of diodes may include green illuminating diodes surrounded on each side by red illuminating diodes, the particular diode which is illuminated depending on the pressure applied, the green diodes being illuminated when the pressure is in the correct range. Such a device is adjustable according to the pipe diameter.
A preferred pressure responsive device allows very small movement of the fixed clamp means relative to another member, for instance the frame of the device. For instance, the fixed clamp means may be attached to the frame by means of disc springs which allow a movement of the order of, say, 20 thousandths of an inch where the butt fusion pressure is of the order of 125 kg. Means are provided for detecting this very small movement of the fixed clamp means and for converting the movement to electrical signals calibrated to provide a visual indication of the pressure being applied to the fixed clamp means.
A preferred arrangement for detecting the movement of the fixed clamp means includes a tuned electrical coil connected to one of the frame and the fixed clamp means and a ferro-magnetic member attached to the other of the frame and the fixed clamp means and located sufficiently close to the coil so that relative movements therebetween causes the frequency of the coil to be altered. Appropriate electronic circuitry is provided to convert the frequency signal to a row of coloured light emitting diodes as mentioned above.
Such a device in accordance with the present invention is shown in the accompanying drawing.
The device includes a frame 1 on which is mounted fixed clamp means 3 for holding a first pipe section 5 and movable clamp means 7 for holding a second pipe section 9. Movable clamp means 7 is movable in a direction towards fixed clamp means 5 by means of a ratchet mechanism 11 which, as shown, is attached to both the movable clamp means 7 and the frame 1.
Fixed clamp means 3 is mounted on the frame 1 via two disc springs 13 and 15 which allow a very small amount of movement of fixed clamp means 3 relative to frame 1. Mounted on frame 1 is a tuned coil (not shown) and mounted closely adjacent thereto but on fixed clamp means 3 is a ferrous pad (not shown). The separation of the coil and the pad may be of the order of +" During the fusion together of the pipe sections 5 and 9, the correct fusion pressure for the specific pipe diameter and the material of the pipes is selected by means of a switch mounted on a control boss (not shown). The ratchet mechanism 11 is operated to bring the pipe sections together, first of all with a heater located inbetween so as to heat the faces of pipe sections 5 and 9 to the appropriate temperature. The heater is then removed and the pipe sections are then brought into direct contact. A visual indication of the pressure being applied is given by a row of coloured light emitting diodes (not shown) which are responsive to the change of frequency in the tuned coil.

Claims (8)

Claims
1. A device for fusion jointing of thermoplastics pipe sections comprising fixed clamp means to hold a first pipe section and movable clamp means to hold a second pipe section, the fixed clamp means being provided with means responsive to and for indicating the pressure applied to the first pipe section by the second pipe section during the fusion jointing process.
2. A device according to claim 1 wherein the device is a lever operated machine.
3. A device according to claim 2 wherein the lever is provided with a ratchet mechanism.
4. A device according to any of the preceding claims wherein the fixed clamp means is mounted on a support, the manner of mounting allowing for small relative movement therebetween on application of pressure to the fixed clamp means.
5. A device according to claim 4 wherein the fixed clamp means is mounted on the support via disc springs.
6. A device according to claim 4 or claim 5 wherein an electrical coil is mounted on one of the support and the fixed clamp means and a ferro-magnetic member is mounted on the other of the frame and the fixed clamp means at a position such that the very small relative movement therebetween will alter the frequency of the coil.
7. A device according to claim 1 and substantially as described herein.
8. A device for fusion jointing of thermoplastics pipe sections substantiaily as described herein with reference to the accompanying drawing.
GB7939342A 1978-11-14 1979-11-14 Device for joining plastics pipe sections Expired - Lifetime GB2038436B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7939342A GB2038436B (en) 1978-11-14 1979-11-14 Device for joining plastics pipe sections

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7844329 1978-11-14
GB7939342A GB2038436B (en) 1978-11-14 1979-11-14 Device for joining plastics pipe sections

Publications (2)

Publication Number Publication Date
GB2038436A true GB2038436A (en) 1980-07-23
GB2038436B GB2038436B (en) 1983-01-06

Family

ID=26269561

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7939342A Expired - Lifetime GB2038436B (en) 1978-11-14 1979-11-14 Device for joining plastics pipe sections

Country Status (1)

Country Link
GB (1) GB2038436B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2124316A (en) * 1982-06-29 1984-02-15 Mitsui Petrochemical Ind Fusion jointing apparatus
GB2134204A (en) * 1983-01-21 1984-08-08 British Nuclear Fuels Ltd Apparatus for aligning members
GB2168000A (en) * 1984-11-26 1986-06-11 Household Installations Ltd Improvements in gutters for roofs, method of assembling gutters and apparatus for assembling gutters
EP0595213A1 (en) * 1992-10-28 1994-05-04 WEGENER GmbH Welding apparatus
EP0732191A3 (en) * 1995-03-15 1998-02-04 Georg Fischer Rohrleitungssysteme AG Apparatus for welding tubular thermoplastic elements together

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2124316A (en) * 1982-06-29 1984-02-15 Mitsui Petrochemical Ind Fusion jointing apparatus
GB2134204A (en) * 1983-01-21 1984-08-08 British Nuclear Fuels Ltd Apparatus for aligning members
GB2168000A (en) * 1984-11-26 1986-06-11 Household Installations Ltd Improvements in gutters for roofs, method of assembling gutters and apparatus for assembling gutters
EP0595213A1 (en) * 1992-10-28 1994-05-04 WEGENER GmbH Welding apparatus
US5795431A (en) * 1992-10-28 1998-08-18 Wegener Gmbh Welding equipment
EP0732191A3 (en) * 1995-03-15 1998-02-04 Georg Fischer Rohrleitungssysteme AG Apparatus for welding tubular thermoplastic elements together

Also Published As

Publication number Publication date
GB2038436B (en) 1983-01-06

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee