GB2245945A - Push-fit pipe couplings - Google Patents

Push-fit pipe couplings Download PDF

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Publication number
GB2245945A
GB2245945A GB9015230A GB9015230A GB2245945A GB 2245945 A GB2245945 A GB 2245945A GB 9015230 A GB9015230 A GB 9015230A GB 9015230 A GB9015230 A GB 9015230A GB 2245945 A GB2245945 A GB 2245945A
Authority
GB
United Kingdom
Prior art keywords
coupling
washer
ring
pipe
sealing ring
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
GB9015230A
Other versions
GB9015230D0 (en
GB2245945B (en
Inventor
Michael Taylor
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.)
Hepworth Building Products Ltd
Original Assignee
Hepworth Building Products 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 Hepworth Building Products Ltd filed Critical Hepworth Building Products Ltd
Priority to GB9015230A priority Critical patent/GB2245945B/en
Publication of GB9015230D0 publication Critical patent/GB9015230D0/en
Publication of GB2245945A publication Critical patent/GB2245945A/en
Application granted granted Critical
Publication of GB2245945B publication Critical patent/GB2245945B/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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • 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
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/322—Providing cavities in the joined article to collect the burr
    • 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
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • 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
    • B29C66/52296—Joining tubular articles involving the use of a socket said socket comprising sealing elements, e.g. gaskets
    • 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
    • B29C66/52297—Joining tubular articles involving the use of a socket said socket comprising slip-off prevention means
    • 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
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/091—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of a ring provided with teeth or fingers
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • B29C66/50—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
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5344—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially annular, i.e. of finite length, e.g. joining flanges to tube ends

Abstract

A push-fit pipe coupling (1) comprises a tubular body (2) with an annular recess (3) extending from one end concentric with and radially spaced from the bore (4) of the body. The recess is provided with a sealing ring (5) establishing a seal between a pipe and the coupling. The coupling is provided with a grab ring (6) for grabbing the pipe to resist withdrawal thereof from the coupling. A washer (7) for supporting the grab ring is positioned between the sealing ring (5) and the grab ring (6). Another washer (10) is disposed between the sealing ring (5) and the retaining ring (8) for acting as a barrier preventing weld flash material (9) from reaching the seal area of the sealing ring (5). <IMAGE>

Description

PUSH-FIT PIPE COUPLINGS This invention relates to push-fit pipe couplings.
A push-fit pipe coupling is described in British Patent Specification 1 486 671. This coupling comprises a tubular body with an annular recess for housing a sealing ring and a grab ring for resisting or preventing withdrawal of the pipe once pushed into the coupling. A retaining cap consists of an annular flange for retaining the sealing member and grab ring within the recess, and a threaded portion for enabling the cap to be removably screwed onto the outside of the tubular body.
Since a fitter is able to remove the cap of the coupling, it is possible for the fitter to reassemble the components of the pipe coupling incorrectly. That is to say, the fitter has the opportunity to replace the components of the fitting in the wrong order. For example, in the case where the coupling comprises a grab ring and a sealing ring, if the sealing ring is inserted into the coupling before the grab ring, the assembled and fitted coupling can leak.
Couplings with non-demountable retaining rings have been proposed. However, difficulties are encountered in the fixing of the retaining ring to the mouth of such couplings.
It is an aim of the present invention to provide a push-fit coupling of the non-demountable type in which the fixing of the retaining ring to the mouth of the coupling is established by relatively simple means and in such a manner as not to interfere with the operation of the components within the mouth of the coupling.
According to the present invention there is provided a push-fit pipe coupling comprising a tubular body with an annular recess extending from one end concentric with and radially spaced from the bore of the tubular body, which bore is for receiving a pipe end, a sealing ring housed in the recess for establishing a seal between the pipe and the annular recess, a retaining means fixed within the mouth of the annular recess by a welded joint for retaining the sealing ring within the coupling, and a washer positioned adjacent the retaining means and between the sealing ring and the retaining means for confining any material exuded from the welded joint to between the washer and the retaining ring.
In a preferred embodiment of the invention, the coupling is provided with a grab ring housed in the recess for grabbing the pipe so that withdrawal of the pipe from the coupling is prevented or at least resisted once the pipe has been pushed into the coupling. In such a coupling, the grab ring is preferably positioned innermost, with the sealing ring being positioned between the washer (hereinafter referred to as the retaining ring washer") and the grab ring.
In this preferred coupling embodying the invention, a second washer is preferably disposed between the grab ring and the sealing ring. This second washer may take the form of the washer described in copending British patent application no. 8926737. 1, the disclosure of which is incorporated herein by reference.
The retaining ring washer may have a cross-section which increases from its outer to its inner diameter in a similar manner as the washer as described in the aforementioned copending British patent application.
The increased cross-section corresponds to a profiled edge of the retaining ring such that the retaining ring washer and retaining ring co-operate to provide an increased space for accommodating any material excluded from the welded joint.
The pipe coupling is preferably formed of polyvinylidenedifluoride (PVDF). The coupling could conceivably be made of other plastics materials such as a polybutylene or a cross-linked polyethylene.
According to the present invention, there is further provided a method of assembling a push-fit pipe coupling such as the one defined above in accordance with the first aspect of the present invention. This method preferably comprises inserting the sealing ring and subsequently inserting the washer followed by the retaining means into the mouth of the annular recess.
The retaining means is than fixed to the mouth of the coupling by welding.
In a preferred method embodying the invention, the welding is established by ultrasonic vibration, the outer diameter of the retaining means being larger than the internal diameter of the mouth of the annular recess whereby an interference fit is established between the retaining means and the mouth.
In the case where the coupling is provided with a grab ring and a second washer, the components are preferably assembled into the coupling in the following order: first the grab ring, secondly the second washer, thirdly the sealing ring, fourthly the first washer and finally the retaining means.
The weld formed by the ultrasonic vibration technique is established by frictional heating of the contact surfaces between the retaining means and the mouth of the tubular body.
In a particular embodiment of the invention, the difference between the outer diameter of the retaining means and the inner diameter of the mouth of the tubular coupling is of the order of 0. 6 to 0. 8 mm.
During the welding operation, the ultrasonic vibration melts the material of the retaining means and the mouth of the tubular body where contact occurs. The ultrasonic vibration is preferably applied by means of a sonotrode to which pressure is applied. This pressure forces the cap into the body. The welding operation tends to cause excess material on both the retaining means and the mouth of the tubular body to exude from the weld region in the form of a weld flash.
This weld flash might appear as a uniform weld bead around the joint for some materials. However, in the case of PVDF, the weld flash emerges as a fibrous ring which is only loosely attached to either or both of the retaining means and mouth of the tubular body. The presence of the washer adjacent to the retaining means prevents the weld flash material from becoming detached or from lodging behind the sealing ring where it would cause a leak path. The advantages of providing the washer adjacent the retaining ring are particularly clear when it is considered that it would be extremely difficult or impossible to remove the weld flash material or to check that the sealing ring was unaffected by the welding operation after fixing of the retaining means had been undertaken.
In embodiments of the invention, the washer is preferably a snug fit within the bore of the tubular body whereby its presence is effective for preventing the weld flash material from entering the space around the sealing ring. As the retaining means is urged into the mouth of the tubular body by the pressure applied to the sonotrode, the weld flash material, while still hot, is confined between the retaining means and the washer.
This reduces the weld flash material to a cohesive flat film which is more firmly anchored to the coupling with less likelihood of movement to the sealing ring area.
The invention will now be further described by way of example, with reference to the accompanying drawings, in which: Figure 1 illustrates a pipe coupling without a washer being disposed between the retaining means and the sealing ring whereby weld flash material obstructs the sealing ring; Figure 2 illustrates a first embodiment of the present invention in which a washer is disposed between the sealing ring and the non-removable retaining means; and Figure 3 is a second embodiment of the invention in which the washer has a part conical profile.
Figure 1 illustrates a pipe coupling 1 comprising a tubular body 2 with an annular recess 3 extending from one end concentric with and radially spaced from the bore 4 of the tubular body. The bore is for receiving a pipe end (not shown) and is provided with a sealing ring 5 for establishing a seal between the pipe and the annular recess. The coupling is provided with a grab ring 6 for grabbing the pipe so that withdrawal of the pipe from the coupling is prevented or at least resisted once the pipe has been pushed into the coupling. A washer 7 is positioned between the sealing ring 5 and the grab ring 6 primarily for supporting the grab ring but also for providing a seat onto which the sealing ring 5 can rest during use of the coupling.
A retaining ring 8 is provided having an outer diameter which is slightly larger than the internal diameter of the annular recess 3. The retaining ring 8 is urged (ie. from the position shown in solid line to the position shown in dotted line detail in Figure 1) into the mouth of the annular recess 3 by pressure applied to a sonotrode which establishes a welding operating between surfaces of the retaining ring 8 and the annular recess 3 which contact one another. The ultrasonic vibration of the welding process causes the material of the retaining ring 8 and the annular recess to melt in the region of the contact areas. This gives rise to a weld flash 9 which emerges from the contact areas as illustrated in Figure 1. This weld flash 9 can interfere with the ability of the sealing ring 5 to effect a secure seal with the annular recess 3.
Figure 2 illustrates a first embodiment of the invention in which the retaining ring is fully seated with the mouth of the annular recess 3. A washer 10 is disposed between the sealing ring 5 and the retaining ring 8 and acts as a barrier preventing the weld flash material 9 from reaching the seal area of the sealing ring 5.
In Figure 3, the washer 10 is provided with a part conical profile, and the retaining means 8 is provided with a corresponding conical profile for providing an increased area for containing the weld flash material 9. This arrangement helps to ensure that excess weld material is directed away from the interior of the pipe coupling.

Claims (10)

1. A push-fit pipe coupling comprising a tubular body with an annular recess extending from one end concentric with and radially spaced from the bore of the tubular body, which bore is for receiving a pipe end, a sealing ring housed in the recess for establishing a seal between the pipe and the annular recess, a retaining means fixed within the mouth of the annular recess by a welded joint for retaining the sealing ring within the coupling, and a washer positioned adjacent the retaining means and between the sealing ring and the retaining means for confining any material exuded from the welded joint to between the washer and the retaining ring.
2. A push-fit pipe coupling according to Claim 1, wherein the coupling is provided with a grab ring housed in the recess for grabbing the pipe so that withdrawal of the pipe and the coupling is prevented or at least resisted once the pipe has been pushed into the coupling.
3. A push-fit pipe coupling according to Claim 2 wherein the grab ring is positioned innermost, the sealing ring being positioned between the washer and the grab ring.
4. A push-fit pipe coupling according to Claim 3, wherein a second washer is disposed between the grab ring and the sealing ring.
5. A push-fit coupling according to any one of the preceeding claims, wherein the washer has a cross-section which increases in thickness from its outer to its inner diameter, the increased cross-section corresponding to a profiled edge of the retaining ring such that the washer and retaining ring co-operate to provide an increased space for accommodating any material exuded from the welded joint.
6. A method of assembling a push-fit pipe coupling comprising a tubular body with an annular recess extending from one end concentric with and radially spaced from the bore of the tubular body, which bore is for receiving a pipe and, a sealing ring for location in the recess for establishing a seal between the pipe and the annular recess, a retaining means for fixing within the mouth of the inner recess, and a washer for positioning adjacent the retaining means and between the sealing ring and the retaining means, the method comprising inserting the sealing ring and subsequently inserting the washer followed by the retaining means into the mouth of the angular recess, and fixing the retaining means to the mouth of the coupling by welding, any material exuded from the welder's joint being confined to between the washer and the retaining ring.
7. A method according to Claim 6, wherein the welding is established by ultra-sonic vibration, the outer diameter of the retaining means being larger than the internal diameter of the mouth of the annular recess whereby an interference fit is established between the retaining means and the mouth.
8. A method according to Claim 6 or Claim 7, wherein the coupling is provided with a grab ring and a second washer, the components being assembled into the coupling in the following order: first the grab ring, secondly the second washer, thirdly the sealing ring, fourthly the first washer and finally the retaining means.
9. A push-fit pipe coupling substantially as hereinbefore described with reference to Figure 2 or Figure 3 of the accompanying drawings.
10. A method of assembling a push-fit pipe coupling according to Claim 6 substantially as hereinbefore described.
GB9015230A 1990-07-11 1990-07-11 Push-fit pipe couplings Expired - Lifetime GB2245945B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9015230A GB2245945B (en) 1990-07-11 1990-07-11 Push-fit pipe couplings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9015230A GB2245945B (en) 1990-07-11 1990-07-11 Push-fit pipe couplings

Publications (3)

Publication Number Publication Date
GB9015230D0 GB9015230D0 (en) 1990-08-29
GB2245945A true GB2245945A (en) 1992-01-15
GB2245945B GB2245945B (en) 1994-04-27

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB9015230A Expired - Lifetime GB2245945B (en) 1990-07-11 1990-07-11 Push-fit pipe couplings

Country Status (1)

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GB (1) GB2245945B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994025786A1 (en) * 1993-04-29 1994-11-10 Wavin B.V. Quick-action coupling for pipes or hoses
GB2294990A (en) * 1994-11-11 1996-05-15 Hepworth Building Prod Push-fit pipe fitting with grab ring
NL9500045A (en) * 1995-01-10 1996-08-01 Wavin Bv Quick-acting coupling for pipes or hoses
EP0838006A1 (en) 1995-07-07 1998-04-29 Marley Extrusions Limited Push-fit tube couplings
FR2777341A1 (en) * 1998-04-08 1999-10-15 Comap Instantaneous quick-fit type connector for pipework e.g. water, central heating
EP1218658A2 (en) * 1999-09-09 2002-07-03 R. Conrader Company Tube fitting
GB2381054A (en) * 2001-10-11 2003-04-23 Polysleeve Products Ltd A pipe fitting
US20120126526A1 (en) * 2009-05-18 2012-05-24 Lequere Philippe Quick-connect fluid coupling

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1569400A (en) * 1976-03-31 1980-06-11 Bristol Prod Coupler for tube
GB2178501A (en) * 1985-07-27 1987-02-11 Victaulic Plc Pipe couplings
GB2211506A (en) * 1987-10-26 1989-07-05 Guest John Ltd Tube coupling bodies

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1569400A (en) * 1976-03-31 1980-06-11 Bristol Prod Coupler for tube
GB2178501A (en) * 1985-07-27 1987-02-11 Victaulic Plc Pipe couplings
GB2211506A (en) * 1987-10-26 1989-07-05 Guest John Ltd Tube coupling bodies

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU673928B2 (en) * 1993-04-29 1996-11-28 Wavin B.V. Quick-action coupling for pipes or hoses
NL9300734A (en) * 1993-04-29 1994-11-16 Wavin Bv Shortcut for pipes or hoses.
WO1994025786A1 (en) * 1993-04-29 1994-11-10 Wavin B.V. Quick-action coupling for pipes or hoses
GB2294990B (en) * 1994-11-11 1997-06-11 Hepworth Building Prod Pipe fitting with grab ring
WO1996015403A1 (en) * 1994-11-11 1996-05-23 Hepworth Building Products Limited Pipe fitting with grab ring
GB2294990A (en) * 1994-11-11 1996-05-15 Hepworth Building Prod Push-fit pipe fitting with grab ring
NL9500045A (en) * 1995-01-10 1996-08-01 Wavin Bv Quick-acting coupling for pipes or hoses
EP0838006A1 (en) 1995-07-07 1998-04-29 Marley Extrusions Limited Push-fit tube couplings
EP0838006B1 (en) * 1995-07-07 2004-09-29 Marley Extrusions Limited Push-fit tube couplings
FR2777341A1 (en) * 1998-04-08 1999-10-15 Comap Instantaneous quick-fit type connector for pipework e.g. water, central heating
EP1218658A2 (en) * 1999-09-09 2002-07-03 R. Conrader Company Tube fitting
EP1218658A4 (en) * 1999-09-09 2004-11-10 Conrader R Co Tube fitting
GB2381054A (en) * 2001-10-11 2003-04-23 Polysleeve Products Ltd A pipe fitting
US20120126526A1 (en) * 2009-05-18 2012-05-24 Lequere Philippe Quick-connect fluid coupling
US8491012B2 (en) * 2009-05-18 2013-07-23 Parker Hannifin Manufacturing France Quick-connect fluid coupling

Also Published As

Publication number Publication date
GB9015230D0 (en) 1990-08-29
GB2245945B (en) 1994-04-27

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Date Code Title Description
PE20 Patent expired after termination of 20 years

Expiry date: 20100710