GB2194826A - Pipe coupling - Google Patents

Pipe coupling Download PDF

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Publication number
GB2194826A
GB2194826A GB08621369A GB8621369A GB2194826A GB 2194826 A GB2194826 A GB 2194826A GB 08621369 A GB08621369 A GB 08621369A GB 8621369 A GB8621369 A GB 8621369A GB 2194826 A GB2194826 A GB 2194826A
Authority
GB
United Kingdom
Prior art keywords
pipe
coupling assembly
assembly according
body
pipe coupling
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Withdrawn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
GB08621369A
Other versions
GB8621369D0 (en
Inventor
Vincent George Joseph Lane
Geoffrey Vernon Cooper
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.)
CANBERRA MOULDINGS Ltd
Original Assignee
* CANBERRA MOULDINGS LIMITED
CANBERRA MOULDINGS LIMITED
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 * CANBERRA MOULDINGS LIMITED, CANBERRA MOULDINGS LIMITED filed Critical * CANBERRA MOULDINGS LIMITED
Priority to GB08621369A priority Critical patent/GB2194826A/en
Publication of GB8621369D0 publication Critical patent/GB8621369D0/en
Publication of GB2194826A publication Critical patent/GB2194826A/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/02Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
    • F16L19/0231Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member with specially adapted means for positioning the threaded member behind the collar

Abstract

A pipe coupling assembly comprises a body 1 with an internal bore 9 adapted to receive the free end of a pipe 6 to be coupled. Annular resilient sealing means 14 housed within a counterbore 13 in the body 1 are adapted to seal against the outer periphery of the pipe 6 when the latter is inserted into the body 1. Resiliently expansible castellated spring-washer 17 through which the pipe can be inserted into the bore 9, engages behind a peripheral projection 7 on the pipe to retain the latter. The spring-washer 17 is retained within a union nut 2 which is screwed on to the body 1. <IMAGE>

Description

SPECIFICATION Pipe couplings The invention relates to pipe couplings, and is of application to quick-release pipe couplings for small bore pipes such as used, for example, in the hydraulic brake and clutch actuating systems, and fuel systems of motor vehicles. It is particularly, but by no means exclusively, concerned with push-in pipe couplings for such applications which enable coupling of a pipe without the use of tools.

Pipe couplings as used with motor vehicle brakes, clutches and fuel lines are normally screw-type couplings with a union nut which clamps up either a pre-formed flared pipe end, thus being usable only with metal pipes, or an olive which surrounds the pipe. Such couplings take time to assemble which adds to vehicle assembly costs, and require tightening with a spanner so that they are difficult to assemble in a closely confined position. Quickassembly couplings have been proposed which comprise connectors into which metal or plastics pipes can fit and which incorporate metal collets to retain the pipes.However, such a coupling has the disadvantages that the collet scores the pipe as the latter enters the connector, that the grip of the collet on a plain pipe surface is relied on, that the coupling can easily be released accidentally, and that the coupling can only be used with relatively low pressure fluid.

The object of the invention is to provide a coupling which overcomes the foregoing disadvantages.

According to the invention a pipe coupling assembly comprises a body having an internal bore adapted to receive the free end of a pipe to be coupled, annular resilient sealing means housed within the body and adapted to seal against the outer periphery of the pipe when inserted into the body, and resiliently expansible pipe-retaining means through which the pipe can be inserted into said bore and which thereafter engage behind a peripheral projection on the pipe to retain the latter.

A spring washer with inner castellations is preferably used as said pipe-retaining means, with the castellations flexing to allow pipe insertion and thereafter engaging behind said peripheral pipe projection to retain the pipe.

This spring washer is desirably shaped so that the castellations are inclined relatively to the axis of the coupling and project towards said body bore.

The coupling assembly may be adapted for connection to a component to which the pipe is to be connected, or for connection to another pipe. In the latter case the body may have a tubular projection-for connection of a flexible other pipe, and the pipe which couples to the assembly may be a tubular projecting stub of a component such as a vehicle brake or clutch cylinder, fuel pump or tank, etc..

Preferably the coupling assembly comprises a main body component with said internal bore which is counterbored to house the resilient sealing means, and a union nut which is screwed on to the main body component and which houses the resilient pipe-retaining means. The nut may have an internal groove in which said castellated washer is located, the body having an internal end taper which as the nut is tightened engages the castellations and cams them inwardly to an operative pipe-coupling position. This enables the free condition of the retaining washer, with the nut removed, to be such that the pipe can be withdrawn from the coupling.

The resilient sealing means preferably comprises an O-ring, which may be one of two 0rings housed side by side in the body counterbore with an anti-extrusion ring disposed between them and a radial projection on the pipe. That projection may be the same projection as the one which is engaged by the piperetaining means, and it may take the form of an external radial bulge produced by deformation of the pipe wall.

A coupling in accordance with the invention can be used with either metal or plastics pipes, and the main and nut components of the body assembly may be plastics mouldings.

The invention will now be further described with reference to the accompanying drawings which illustrate, by way of example, a preferred embodiment of the invention. In the drawings: Fig. 1 is an axial cross-sectional view of a coupling assembly in accordance with the invention, shown coupled to a pipe; Figs. 2 and 3 are respectively axial crosssectional and outer end views of a union nut of the coupling; and Fig. 4 is an axial cross-spctional view of an anti-extrusion ring of the coupling.

The coupling assembly illustrated comprises a body assembly comprising a main component or adaptor body 1 and a union nut 2. As shown the coupling is fitted on to one end of a flexible pipe 3, to this end the body 1 having a tubular projection 4 over which the pipe 3 is fitted. This projection 4 has a conventional fir tree profile as shown, and if necessary the the pipe 3 may be secured by a pipe clip. The coupling serves for detachable connection of the pipe 3 to a component 5, which might for example be a carburettor, brake cylinder or clutch cylinder of a motor vehicle. For such connection the component 5 has a tubular projecting stub 6 forming the pipe which fits the coupling.

The wall of the pipe 6 is deformed to provide two spaced annular peripheral bulges 7 and 8, the bulge 7 also being spaced from the free end of the pipe 6. The body 1 has a bore 9 which closely receives the plain end portion 10 of the pipe 6, and a hexagonal portion 11 which provides spanner flats. On the side of the body portion 11 remote from the projection 4 the body 1 has an annular screw-threaded portion 12 on to which the union nut 2 is screwed. The body 1 has a counterbore 13 in which are housed two 0rings 14, providing resilient sealing means and which engage the outer periphery of the end portion 10 of the pipe 6, and an anti-extrusion ring 15. The ring 15 has an internal chamfer on its outer side, as shown in Fig. 4, and the pipe bulge 7 seats against this chamfer 16 when the pipe 6 is pushed fully home into the coupling body 1.A metal spring washer 17 is retained within an annular groove 18 in the nut 2 at the inner end of the screw thread 19 of the nut. This washer 17 provides resiliently expansible pipe-retaining means and has inner castellations which are typically four in number, equi-angularly distributed and in the form of rectangular tongues which are inclined to the coupling- axis and project towards the body bore 13.

The nut 2 is of cylindrical shape with two spanner flats 20 to facilitate tightening relatively to the body 1, or alternatively a hexagon nut may be used. When the nut is fully tightened, as shown in Fig. 1, the washer 17 is clamped against the end of the body projection 12, the latter having an internal end taper 21 which, as the nut 2 is tightened, engages and cams the castellations of the washer 17 inwardly to the pipe-retaining position illustrated in which they are disposed to engage behind the peripheral projection of the pipe 6 provided by the leading-bulge 7.

The embodiment illustrated provides a pushin quick-assembly coupling. With the nut 2 tightened on the body 1 the coupling is made merely by pushing the body assembly, by hand, over the end of the pipe 6. When the pipe bulge 7 reaches the washer catellations 17a the latter flex outwardly to allow passage of the bulge 7, after which they return to the pipe-retaining positions illustrated and engage behind the bulge 7 to retain the pipe 6 within the coupling. When the pipe 6 is pushed fully home within the coupling, with the bulge 7 positively retained by the castellations 17a as illustrated, the bulge 8 is flush with the outer end of the nut. Thus this inner bulge 8 provides a visual indication that the pipe -6 is fully home and the coupling reliably made. To prevent the nut working loose in service, a thread locking agent may be used or a tab washer be fitted.

The various components of the coupling assembly can be made from a variety of suitable materials, for example the body 1 and nut 2 may be of metal or be plastics mouldings.

The material of the O-rings 14 will naturally be chosen to suit the fluid being sealed, for example butadine-styrene being suitable for use with hydraulic brake fluid. The anti-extrusion ring 15 may be moulded from a suitable plastics material, for example nylon, and the coupling may be used with either metal or plastics pipe. As the pipe either Bundy tubing or cold formed steel tubing is particularly suitable. Internal pipe pressures of up to 3000 psi (2.1 kgm/mm2) can safely be handled.

Claims (16)

1. A pipe coupling assembly comprising a body with an internal bore adapted to receive the free end of a pipe to be coupled, annular resilient sealing means housed within the body and adapted to seal against the outer periphery of the pipe when the latter is inserted into the body, and resiliently expansible piperetaining means through which the pipe can be inserted into said bore and which thereafter engage behind a peripheral projection on the pipe to retain the latter.
2. A pipe coupling assembly according to claim 1, wherein said pipe-retaining means comprises a spring washer with inner castellations adapted to flex to allow pipe insertion and thereafter to engage behind said peripheral projection to retain the pipe.
3. A pipe coupling assembly according to claim 2, wherein said spring washer is shaped so that the castellations thereof are inclined relatively to the axis of the coupling and project towards said internal bore# of the body.
4. A pipe coupling assembly according to any one of the- preceding claims, wherein the assembly is adapted for connection to a component to which the pipe is to be connected.
5. A pipe coupling assembly according to any one of claims 1 to 3, wherein the assembly is adapted for connection to another pipe.
6. A pipe coupling assembly according to claim 5, wherein the body has a tubular projection for connection of a flexible pipe providing said another pipe.
7. A pipe coupling assembly according to any one of the preceding claims as fitted to said pipe to be coupled, wherein the pipe to be coupled is a tubular projecting stub of a component such as a vehicle brake or clutch cylinder, fuel pump or tank, etc..
8. A pipe coupling assembly according to any one of the preceding claims, wherein the assembly comprises a main body component with said internal bore and which is counterbored to house the resilient sealing means, and a union nut which is screwed on to the main body component and which houses the resiliently expansible pipe-retaining means.
9. A pipe coupling assembly according to claim 1 or 2 and claim 8, wherein the nut has an internal groove in which said castellated washer is located, the body having an internal end taper which as the nut is tightened engages the castellations and cams them inwardly to an operative pipe-retaining position.
10. A pipe coupling assembly according to claim 9, wherein the free condition of the re taining washer, with the nut slackened is such that the pipe can be withdrawn freely from the coupling.
11. A pipe coupling assembly according to claim 10, wherein the main body component and the union nut are each a plastics moulding.
12. A pipe coupling assembly according to any one of the preceding claims, wherein said resilient sealing means comprises an O-ring.
13. A pipe coupling assembly according to claim 12, wherein said O-ring is one of two O-rings housed side by side in said counterbore of the body with an anti-extrusion ring positioned so that, when the assembly is fitted to the pipe to be coupled, the ring is disposed between the O-rings and a radial projection on the pipe.
14. A pipe coupling assembly according to claim 13, wherein said radial projection is the same projection of the pipe as- that which is engaged by the pipe-retaining means.
15. A pipe coupling assembly according to claim 14, wherein said radial projection is in the form of an external radial bulge produced by deformation of the wall of the pipe
16. A pipe coupling assembly constructed and arranged substantially as herein particularly described with reference to the accompanying drawings.
GB08621369A 1986-09-04 1986-09-04 Pipe coupling Withdrawn GB2194826A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08621369A GB2194826A (en) 1986-09-04 1986-09-04 Pipe coupling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08621369A GB2194826A (en) 1986-09-04 1986-09-04 Pipe coupling

Publications (2)

Publication Number Publication Date
GB8621369D0 GB8621369D0 (en) 1986-10-15
GB2194826A true GB2194826A (en) 1988-03-16

Family

ID=10603686

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08621369A Withdrawn GB2194826A (en) 1986-09-04 1986-09-04 Pipe coupling

Country Status (1)

Country Link
GB (1) GB2194826A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2222218A (en) * 1988-08-26 1990-02-28 Usui Kokusai Sangyo Kk Push fit pipe connector.
GB2236370A (en) * 1989-09-27 1991-04-03 Usui Kokusai Sangyo Kk Small diameter pipe connector
GB2243423A (en) * 1990-04-04 1991-10-30 Usui Kokusai Sangyo Kk Snap fit connector for thin pipes
GB2290591A (en) * 1994-06-24 1996-01-03 Bend All Mfg Inc End fitting for pipe connection
US5979946A (en) * 1996-09-25 1999-11-09 Bend All Manufacturing Inc. Snap-in end fitting for pipes
EP1081297A2 (en) * 1999-09-01 2001-03-07 Friedrich Grohe AG &amp; Co. KG Water armature with connection device
CN102032022A (en) * 2011-01-24 2011-04-27 潍柴动力股份有限公司 Pressure oil pipe and engine comprising same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1024537A (en) * 1963-10-30 1966-03-30 Neue Argus Gmbh Push-in pipeline coupling with displaceable unlocking ring
GB1029123A (en) * 1964-03-17 1966-05-11 Compression Joints Ltd Improvements in pipe unions
US4097074A (en) * 1976-12-08 1978-06-27 Kubota, Ltd. Pipe joint construction
US4226445A (en) * 1978-10-20 1980-10-07 Armaturenfabrik Hermann Voss Gmbh & Co. Hose and pipe coupling
GB2063834A (en) * 1979-09-21 1981-06-10 Boc Ltd Coupling or closure assemblies
US4600223A (en) * 1982-09-21 1986-07-15 Vries Robert De Tube coupling

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1024537A (en) * 1963-10-30 1966-03-30 Neue Argus Gmbh Push-in pipeline coupling with displaceable unlocking ring
GB1029123A (en) * 1964-03-17 1966-05-11 Compression Joints Ltd Improvements in pipe unions
US4097074A (en) * 1976-12-08 1978-06-27 Kubota, Ltd. Pipe joint construction
US4226445A (en) * 1978-10-20 1980-10-07 Armaturenfabrik Hermann Voss Gmbh & Co. Hose and pipe coupling
GB2063834A (en) * 1979-09-21 1981-06-10 Boc Ltd Coupling or closure assemblies
US4600223A (en) * 1982-09-21 1986-07-15 Vries Robert De Tube coupling

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2222218A (en) * 1988-08-26 1990-02-28 Usui Kokusai Sangyo Kk Push fit pipe connector.
GB2222218B (en) * 1988-08-26 1992-11-04 Usui Kokusai Sangyo Kk Connector for tube of small diameter
GB2236370A (en) * 1989-09-27 1991-04-03 Usui Kokusai Sangyo Kk Small diameter pipe connector
GB2236370B (en) * 1989-09-27 1993-06-16 Usui Kokusai Sangyo Kk A pipe connector
GB2243423A (en) * 1990-04-04 1991-10-30 Usui Kokusai Sangyo Kk Snap fit connector for thin pipes
GB2290591A (en) * 1994-06-24 1996-01-03 Bend All Mfg Inc End fitting for pipe connection
GB2290591B (en) * 1994-06-24 1998-02-11 Bend All Mfg Inc End-fitting for pipe connection
US5979946A (en) * 1996-09-25 1999-11-09 Bend All Manufacturing Inc. Snap-in end fitting for pipes
EP1081297A2 (en) * 1999-09-01 2001-03-07 Friedrich Grohe AG &amp; Co. KG Water armature with connection device
EP1081297A3 (en) * 1999-09-01 2001-03-28 Friedrich Grohe AG &amp; Co. KG Water armature with connection device
CN102032022A (en) * 2011-01-24 2011-04-27 潍柴动力股份有限公司 Pressure oil pipe and engine comprising same
CN102032022B (en) 2011-01-24 2012-08-08 潍柴动力股份有限公司 Pressure oil pipe and engine comprising same

Also Published As

Publication number Publication date
GB8621369D0 (en) 1986-10-15

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Legal Events

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