WO2023020695A1 - Raccord de sécurité pour joint à compression - Google Patents

Raccord de sécurité pour joint à compression Download PDF

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Publication number
WO2023020695A1
WO2023020695A1 PCT/EP2021/073043 EP2021073043W WO2023020695A1 WO 2023020695 A1 WO2023020695 A1 WO 2023020695A1 EP 2021073043 W EP2021073043 W EP 2021073043W WO 2023020695 A1 WO2023020695 A1 WO 2023020695A1
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WO
WIPO (PCT)
Prior art keywords
sub
pipe
safety
parts
fitting
Prior art date
Application number
PCT/EP2021/073043
Other languages
English (en)
Inventor
Christopher BOTHAM
Original Assignee
Botham Christopher
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 Botham Christopher filed Critical Botham Christopher
Priority to PCT/EP2021/073043 priority Critical patent/WO2023020695A1/fr
Publication of WO2023020695A1 publication Critical patent/WO2023020695A1/fr

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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
    • F16L19/00—Joints 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
    • F16L19/06—Joints 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 in which radial clamping is obtained by wedging action on non-deformed pipe ends
    • F16L19/075—Joints 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 in which radial clamping is obtained by wedging action on non-deformed pipe ends specially adapted for spigot-and-socket joints for pipes of the same diameter
    • 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
    • F16L19/00—Joints 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
    • F16L19/08—Joints 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 with metal rings which bite into the wall of the pipe
    • F16L19/10—Joints 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 with metal rings which bite into the wall of the pipe the profile of the ring being altered
    • 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
    • F16L21/00—Joints with sleeve or socket
    • F16L21/06—Joints with sleeve or socket with a divided sleeve or ring clamping around the pipe-ends
    • 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
    • F16L21/00—Joints with sleeve or socket
    • F16L21/06—Joints with sleeve or socket with a divided sleeve or ring clamping around the pipe-ends
    • F16L21/065—Joints with sleeve or socket with a divided sleeve or ring clamping around the pipe-ends tightened by tangentially-arranged threaded pins
    • 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
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F16L57/005—Protection of pipes or objects of similar shape against external or internal damage or wear specially adapted for the ends of pipes
    • 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
    • F16L2201/00—Special arrangements for pipe couplings
    • F16L2201/20—Safety or protective couplings
    • 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

Definitions

  • the present invention relates to a compression joint security fitting, and more specifically to a security or safety device adapted to be applied to a pre-existing, in-use compression joint of conventional construction typically employed in the vast majority of domestic, commercial and industrial premises to connect the free ends of two or more fluid -carrying pipes together in mechanically and hydraulically secure fashion.
  • the present invention is not so much concerned with the type of joint or the physical means by which that joint achieves an ostensibly mechanically and hydraulically sound connection between the pipe free end and the joint itself, but more with aspects of the exterior configuration of joint body and, if present and/or required, the mechanical means which, as part of the connection process between pipe and joint, may be screwed onto or otherwise secured to the joint body.
  • compression joint appears throughout the following description, the skilled reader should understand that this term is to be broadly interpreted and indeed may, where context requires, cover a multitude of different types of joints and their respective jointing means, mechanisms and arrangements, such not necessarily being of a “compression” type in the traditional sense, but which nevertheless act on both the joint and the pipe to, ostensibly at least, secure the latter to, and commonly at least partially within, the former.
  • Compression fittings and associated pipework at the lower end of this range (8, 10, 15, and occasionally 22mm) are most commonly found in domestic environments, whereas larger pipes and joints (22mm and above) are more commonly found in larger commercial and industrial premises, where there are more often requirements to transport much larger volumes of fluid, often at significantly greater static pressures than are employed in domestic environments.
  • compression joints function perfectly well, often for many years, without leaking.
  • the fundamental issue is not that they can function perfectly well for long periods of time, but that when they fail, they fail catastrophically.
  • a most common failure mode for larger compression joints is that the pipe carrying the pressurised fluid, typically water, works entirely and completely free from within the fitting body, resulting in the immediate unrestrained and continuous (until arrested) discharge of fluid from the said pipe.
  • the wrench or spanner required can be substantial, e.g. up from 50-100cm in length. If these guidelines are followed, or even if the compression nut is over- tightened beyond the recommendations, the effect of tightening the compression nut under the mechanical advantage provided by the spanner or wrench is two fold:
  • Grab rings are well known in the industry, and generally comprise a continuous circular peripheral ring part from which project, inwardly of the ring part, a plurality of identical short (compared to the diameter of the ring part) tongues, each tongue being inclined at the same general angle to the cross-sectional plane containing the ring part.
  • the number of individual tongues can vary depending on the diameter of the grab ring and its application, but usually they number between 6-20, and their length may range between 2-15% of the diameter of the ring itself.
  • the grab rings are of unitary construction, so the tongues are integrally formed with the ring part, for example by punching or stamping techniques.
  • any grab ring is to axially retain a pipe of suitable diameter within a fitting in which the grab ring is housed and seated.
  • a pipe having an external surface diameter which is marginally larger than the diameter of the notional aperture defined to the interior of the grab ring by the tongue free ends thereof, is inserted therethrough, the tongues are slightly elastically deflected outwardly by the pipe exterior cylindrical surface.
  • the pipe Once the pipe has been axially inserted through the grab ri ng to a desired extent, it is subsequently prevented from being axially withdrawn in the reverse direction because the relatively sharp tongue ends of the grab ring frictionally engage with the exterior surface of the pipe and in some cases, depending on relative hardness of the materials of grab ring and pipe exterior surface, actually bite into the pipe exterior surface. In essence therefore, the tongues of the grab ring act as barbs on the pipe exterior surface.
  • the grab ring is held in place within the fitting immediately behind the opening of the annular cavity and orientated with its circular array of short tongues directed inwardly of the fitting and away from the annular opening which they surround.
  • a dual-ended fitting of similar construction and also utilising grab rings is illustrated and described in GB2538448 in the name of Pegler Yorkshire Group Limited.
  • the main object of the present invention is to mitigate if not indeed entirely overcome the problem of catastrophic mechanical failure of larger, more conventional compression joints constituted predominantly or exclusively of metal, typically brass, and to provide a ready indicator to the casual observer that the compression joint has been rendered "safe” by means of the device of the present invention being immediately instantly recognisable and clearly distinguished from the compression joint to, over and/or around which is fitted.
  • Use of the term "larger” as it appears in this paragraph and elsewhere in this document, as applied to compression joints, should be understood as being adapted to receive pipework of 22mm diameter and above, i.e. 28mm, 35mm, 42mm, 54mm, and possibly even greater.
  • a safety fitting for pipe jointing means having at least a body portion with at least one opening at one end thereof within which a pipe end is adapted to be at least partially inserted and retained in place by primary pipe engaging means disposed over and around said opening, such either forming an integral part of said pipe jointing means or being initially separate therefrom and subsequently secured to said body portion end, said safety fitting consisting of at least first and second sub-parts adapted, in use, to be connected to one another over and around both of:
  • said first and second sub-parts of said fitting when connected together, defining internally a hollow bore therethrough having at least two discrete regions, a first region generally corresponding in shape and size to said end of said pipe jointing means and any primary pipe engaging means connected thereto and thus being capable of accommodating such, and a second region substantially corresponding in shape and size to the exposed region of the exterior surface of said pipe immediately proximate said pipe jointing means end,
  • At least one of said safety fitting sub-parts is provided with flange means which project inwardly of said hollow bore in the first region thereof and which, in use, are disposed behind one or other of: a laterally outwardly projecting surface of said primary pipe engaging means, and an exterior surface of said pipe jointing means which projects laterally outwardly therefrom so as to effectively secure said safety fitting to said pipe jointing means, and at least one of said safety fitting sub parts is provided with frictional engagement means which project inwardly of said hollow bore in the second region thereof and which, in use, engage said pipe exterior surface, the result of which, in cooperation with said flange means, is to effectively prevent axial displacement of said pipe away from said pipe jointing means.
  • one, and further preferably both sub-parts of said safety fitting is/are provided with both flange means and frictional engagement means.
  • both safety fitting sub-parts are provided with both flange means and frictional engagement means.
  • one or both of the flange means and frictional engagement means provided in one or both sub-parts is one of intermittent, preferably angularly periodically so, and substantially continuous.
  • the flange means provided on one or both sub-parts of the safety fitting are substantially continuous such that, in use when said sub-parts are, in use, disposed in overlying relationship over and around the pipe jointing means end, said flange means together define a substantially continuous restraining collar which is disposed behind the laterally projecting surface of the pipe jointing means end and/or the primary pipe engagement means provided thereon or connected thereto thus effectively preventing the safety device as a whole from sliding axially away from the pipe jointing means body and over and off the end thereof.
  • each of the two sub-parts of the safety device forms one half of the safety device as a whole, and most preferably, except for formations and design aspects thereof which permit the releasable connection of one sub-part to the other, said sub-parts are substantially identical in shape and configuration.
  • each sub-part of said safety device is preferably substantially hemi-cylindrical in cross-section, and the hollow bore defined internally of and through the safety device when the two sub-parts thereof are, in use, brought into overlying relationship with one another, arises as a result of each sub-part being internally provided with a hemi-cylindrical channel having two distinct regions corresponding to the first and second regions of the bore which, in use, said hemi-cylindrical channels together partially define.
  • the hemi-cylindrical channel provided in one or other sub-part in its first region has a larger diameter than that of the second region of said channel, the former diameter being marginally greater than the largest external diameter of the pipe jointing means end and any primary pipe engagement means connected thereto, and the diameter of the second region of the hemi- cylindrical channel being one of: marginally less than, substantially equal to, or marginally greater than the diameter of the exterior surface of the pipe which, in use, passes through the second region of the hollow bore through the safety device.
  • the first region of the hollow bore within the safety device either loosely, comfortably or more preferably, snugly, accommodates the relevant end of the pipe jointing means and any primary pipe engagement means provided thereon or connected thereto, whereas the second region of the bore through the safety device accommodates, and most preferably engages with, the exterior surface of the pipe around which it is disposed.
  • the innermost radial dimension of the flange means is selected so as to be marginally greater than the corresponding diameter or other dimension of the pipe jointing means body so that the latter can be accommodated without hindrance within the terminal aperture ultimately defined by the flange portions of both sub-parts when they are brought together in overlying relationship around said pipe jointing means.
  • the flange means are disposed behind a relevant laterally projecting surface of the relevant end of the pipe jointing means and any primary pipe engagement means provided thereon or connected thereto.
  • the axial length of the cavity defined between and within the two sub-parts and their respective flange portions and intervening shoulders or surfaces is marginally (for which term herein the reader should understand a range of between 0.5-4.5mm, depending on the pipe diameter and overall size of the pipe jointing means) greater than the corresponding axial length dimension of the primary pipe engagement means provided on or connected to the relevant end of the pipe jointing means.
  • the frictional engagement means provided in one or both sub-parts of the safety device possess some degree of resiliency, in that they are capable of being elastically deformed slightly when, in use, they are brought into engagement with the exterior surface the pipe as both said subparts are brought together in overlying relationship on either side of both the end of the pipe jointing means and the pipe inserted therein, and then connected to one another.
  • the frictional engagement means engage with and act upon the relevant region of the exterior surface of the pipe in any one or more of the following ways:
  • the frictional engagement means are constituted by a plurality of resilient teeth, tongues, prongs or the like, most preferably being formed of a material which is relatively harder than the material of the pipe exterior surface with which they come into engagement.
  • said teeth may actually elastically or plastically deform the pipe exterior surface and become embedded therein and, as will become apparent from the specific description below, act as barbs which mechanically resist any subsequent tendency of the pipe to axially separate from the pipe jointing means.
  • the teeth, tongues, prongs or the like of the frictional engagement means are i nclined from the transverse plane containing their roots, the angle of inclination being anywhere within the range 1 -40 degrees, and the direction of the inclination being away from the most axially proximate free end of the sub part, that is towards the first region of the hemi-cylindrical channel provided in the or each subpart, and in the direction of the more axially remote free end thereof.
  • the teeth, tongues, p rongs or the like may exert their barb-like action on the pipe exterior surface, whereas if they were inclined in the opposite axial direction, they would exert little or no mechanical barb-like action or frictional resistance on the pipe exterior surface, which would merely slide and slip past their ends.
  • At least one slot orientated preferably substantially laterally relative to the axis of the hemi-cylindrical channel provided in that sub-part, said slot most preferably being also hemi-cylindrical in cross-section and adapted to receive correspondingly shaped, i.e most preferably semi-annularly shaped, frictional engagement means, at least some portion of which, when said frictional engagement means are seated completely within said slot, stand proud of at least one edge of the slot and thus project inwardly into the second region of the hemi-cylindrical channel provided in that sub-part.
  • lateral slots as described are provided in both of the second regions of the hemi-cylindrical channels provided in said sub-parts, most preferably at approximately the axial mid-point of said second regions of said hemi-cylindrical channels, and semi-annularly shaped frictional engagement means are provided in both said slots.
  • both frictional engagement means so provided have portions which project above and beyond at least one edge of the slots into the respective hemi- cylindrically shaped channel of the respective sub-parts.
  • both sub-parts are provided internally with respective frictional engagement means in their respective slots such that when the two sub-parts of the safety fitting are, in use, brought together in overlying relationship over and around the respective portions of both the ends of the pipe jointing means and the immediately adjacent exposed exterior surface of the pipe inserted therein, the portions of the friction engagement means which stand proud of the slots first come into contact with the exterior surface of the pipe before other interior surfaces of the sub-parts.
  • said proud standing portions of the frictional engagement means engage more firmly with the exterior surface of the pipe, possibly elastically and/or plastically deforming it in the contact regions, thus at least securely frictionally if not also mechanically providing a secure grip thereon on the pipe exterior surface.
  • the frictional engagement means is in the form of inwardly projecting and appropriately inclined tongues which engage with and possibly bite into the exterior surface of the pipe, may actually be improved and/or strengthened in the event that the pipe tries to axially separate from the pipe jointing means, because small displacements of the pipe relative to the jointing means in this direction would only result in the tongues ends becoming further embedded in the pipe exterior surface.
  • the frictional engagement means can resist very significant forces, possibly one or more orders of magnitude greater than that which common fluid static pressures could potentially exert on the pipe and which might tend to axially displace the pipe away from the pipe jointing means.
  • the frictional engagement means are provided by two separate halves (or in some embodiments, slightly less than one exact half) of a known grab ring provided with a plurality of circumferentially spaced apart tongues which project inwardly of the ring (or its semi-annular equivalent when halved), and which, when received in and completely and fully seated in the appropriate slots in each sub-part, project upwardly above at least one of the edges of each of the slots and into the hemi-cylindrical channels of one or each sub-parts in which said slots are provided.
  • the frictional engagement means are provided by such substantially semi-annular grab ring parts, they are constituted of material, for example steel or aluminium, which is relatively harder than the material of which the exterior surface of the pipe is constituted, which may traditionally be copper, or in some cases any one of a number of plastics materials.
  • the one or more slots provided in the or each sub-part and which receive substantially semi-annularly shaped grab ring halves as described above is provided with a substantially continuous chamfer along one edge thereof so as to provide one or both of: a seating surface, and a clearance spacefor the inwardly projecting and usually inclined (relative to the notional cross-sectional plane of the grab ring half) tongues of the semi-annular grab ring halve which said slot is to receive.
  • the alternate edge of the or each of said slots is substantially straight-edged and not so chamfered, and thus the or each slot may be considered to be "handed" in that it is only capable of receiving a grab-ring halve in a particular, correct orientation as regards the action that said grab ring is to provide on the exterior surface of the pipe and with which the tongues of the grab ring come into frictional and possibly also mechanical, for example biting or barb-like engagement.
  • the degree of inclination of the chamfer substantially corresponds to the degree of inclination of the tongues of the particular grab -ring half the slot is adapted to receive and accommodate.
  • the grab ring halves must be orientated correctly before they inserted within the or each slot, and secondly the grab ring halves can be accommodated without any pre-stress or bending, or only minimal pre-stress or bending, being applied to some or all of the tonges thereof.
  • the effective length of those tongues is effectively much reduced and therefore the resistance to bend and flex of those tongues may be correspondingly increased, and in turn , therefore, the frictional and/or mechanical action exerted by the tips of those tongues on the exterior surface of pipe may be considerably increased when each sub-part of the safety device is progressively brought into overlying and ultimately clamping relationship with the other around the pipe.
  • the depth of the slot and the grab ring halves, the length of the tongues provided thereon, and inclination of the chamfer are all appropriately selected and/or designed, it may even be possibly, under normal usage, to prevent the tips of the tongues from experiencing any significant deformation at all, the result of such an arrangement being that the projecting tongue tips are much more likely to bitingly engage and become at least partially embedded within the exterior surface of the pipe, and thus significantly more robustly prevent any subsequent axial displacement of the pipe away from the pipe jointing means to and within which it is secured.
  • one or both sub-parts of the safety device are formed from a readily mouldable, for example by injection, plastics material. More preferably, the sub-parts are formed from a thermosetting or thermoplastic plastics or resin material. In some embodiments, the sub-parts may be substantially or entirely formed from polytetrafluoroethylene (PTFE), nylon, polyethylene, polyvinyl chloride (PVC) or other suitable injection or otherwise mouldable plastics material.
  • PTFE polytetrafluoroethylene
  • PVC polyvinyl chloride
  • each sub-part of the safety device is an entirely separate component from the other
  • the manner in which one sub-part is fixedly secured to the other, preferably in releasable fashion is by means of simple screws, preferably using one or two pairs thereof.
  • one sub-part may be provided with one or preferably two pairs of apertures, one of each pair being provided towards the lateral extremities of the relevant sub-part in a location to one or other side and outwith the hemi-cylindrical channel provided in the interior of that sub part, and each of the two apertures of both pairs (where provided) being axially spaced apart by a suitable distance, e.g.
  • the one or two pairs of apertures are disposed in that axial part of the sub-part which coincides with the second region of the hemi-cylindrical channel, because it is in this particular region that it is desired that the clamping effect provided by the screws is desired to have its greatest effect, i.e. where the frictional engagement means is provided internally of the sub part.
  • the two pairs of apertures are disposed substantially axially symmetrically and to either side, axially speaking, of the slot provided within the second region of the hemi-cylindrical channel of that sub-part.
  • correspondingly shaped, sized and positioned screw-shank receiving recesses may, in some preferred embodiments, be required to be provided in the alternate sub-part, such that appropriate screws can be fed through the apertures provided in one sub-part and into the screw-shank receiving recesses of the other part, and thus the two sub-parts may be screwingly and releasably, not to mention easily and quickly, connected together and in a manner which effectively clamps the sub-parts in position around respective regions of both the end of the pipe jointing means and the pipe inserted therein.
  • the screws, and the respective apertures and recesses provided on or in the sub-parts will preferably ideally be axially separated from one another, most preferably substantially symmetrically or equidistantly on either side of the slot and the frictional engagement means it holds.
  • the clamping force exerted by the screws on each sub-part and in turn on said frictional engagement means, and thus on the pipe exterior surface itself is substantially uniformly distributed and evenly applied, which the skilled reader will immediately appreciate can be most beneficial as regards the ultimate robustness of the frictional and/or mechanical connection between the frictional engagement means and the pipe exterior surface.
  • one or both of the respective pairs of apertures and recesses are provided around their, in use, most closely disposed surrounding surfaces with cooperating ribs and correspondingly sized rebates which cooperate in male-female fashion and ensure that any and preferably all of the apertures are automatically coaxially aligned with their corresponding recesses.
  • the safety device may be of unitary construction in that the sub-parts thereof are integrally formed together and united by a relatively thin (e.g. 1 -2mm thickness, or possibly less), narrow (e.g. 2 -4mm) flexible web of the material from which they are formed, such that the two sub-parts are formed initially in side-by-side relationship, and may be subsequently brought into overlying relationship around a relevant end of the pipe jointing means and the pipe inserted therein simply by manually folding one sub-part over the other about the flexible web.
  • a relatively thin e.g. 1 -2mm thickness, or possibly less
  • narrow (e.g. 2 -4mm) flexible web of the material from which they are formed
  • each sub-part is integrally provided, preferably on, along or proximate their respectively opposite, free substantially axially aligned edges, with cooperating mechanical engagement means, such as, for example, simple well -known cantilever snap-fit type formations.
  • cooperating mechanical engagement means such as, for example, simple well -known cantilever snap-fit type formations.
  • each sub-part of the fitting can still be very securely connected to the other along both axial edges without requiring any screws and the attendant tools required for them, because each adjacent axial edges of each sub - part are automatically firmly connected together, on one hand by means of the flexible web of material, and on the other hand, by means of the cooperating mechanical engagement means.
  • the mechanical engagement means will often be of a type, particularly in the case of snap-fit formations, which provide a positive audible click or "snap" when the mechanical engagement is complete, thus automatically signifying to an installer that the connection of respective sub-parts of the safety fitting is complete and secure.
  • a yet further advantage of such types of mechanical engagement means is that the inherently resiliency of the flexible web of material which joins the two sub-parts naturally always tends to recover elastically to its original, un-bent condition in which each sub-part is disposed essentially adjacent the other in fully open, flat condition. Therefore, it will always be immediately evident, upon inspection, to determine whether any safety device of this particular type has been completely, properly a nd securely connected because if it has not, it will be clearly visible that one sub-part lies some way distant from the other on account of the natural tendency of the flexible web of material to elastically relax and thus move the respective sub-parts joined on either side thereof away from one another.
  • Figure 1 shows a perspective view of a conventional (prior art) compression fitting commonly used for connecting together the free ends of first and second pipes, and to which the present invention is most ideally suited,
  • Figures 2A, 2B show perspective views of various types of known (prior art) grab-rings already in widespread use within various different types of pipe jointing means, and which, when cut in half, may be ideally suited to providing the frictional engagement means utilised within the safety device according to some embodiments of the present invention
  • Figures 3 and 4 show perspective views of the interiors of the first and second sub-parts of the safety device according to some embodiments of the present invention
  • Figures 5 and 6 show perspective views of, respectively one, and then both of the sub -parts of the safety device according to some embodiments of the present invention arranged around compression fitting of Figure 1 after having been assembled to connect two pipes together, with Figure 5A showing an enlarged view of the dotted area in Figure 5,
  • Figures 7A, B, and 7C, D respectively show a plan view of the interior, and an end elevation from the plane indicated in Figures 7A, 7D of each of the two sub -parts of the safety device according to some embodiments of the present invention
  • Figures 8A, 8B respectively show side elevations of the sub-parts depicted in Figures 7A, B, and in Figures 7C, 7D,
  • Figures 9A, 9B respectively show plan views of the top of the sub -parts depicted in Figures 7A, B, and in Figures 7C, 7D, and
  • Figure 10 shows a perspective view of a safety device of unitary construction comprising two integrally formed sub-parts provided with cooperating snap-fit means, according to a modified aspect of the present invention, particularly adapted for entirely manual attachment to a suitable compression fitting or other pipe jointing means.
  • a conventional compression fitting indicated generally at 2 which comprises an essentially completely and continuously hollow compression fitting body 4 at either end of which is provided an exteriorly threaded hollow shank 6, 8 into which the free ends of first and second pipes 10, 12 respectively can be slid before abutting an interior shoulder (not shown) within the interior of the fitting.
  • the dimensions are both generally standardised (e.g.
  • BSP size for example anywhere between 8mm and 54mm as previously mentioned
  • BSP size for example anywhere between 8mm and 54mm as previously mentioned
  • the clearance between the exterior diameter of the pipes 10, 12 and the interior diameters of the hollow shanks 6, 8 must be less than the thickness of essentially annular olives 14, 16 which have interior diameters which are marginally larger than the pipe diameters, and exterior diameters which are marginally larger than the interior diameters of the hollow shanks.
  • the olives can easily slide over the pipes, but a pipe with an olive in place over its free end cannot, at least initially, be received within hollow shank of the compression fitting body.
  • compression nuts 18, 20 with annular end flanges 22, 24 are first slid over the pipes, said compression nuts not only providing the means for connecting the pipes to the compression fitting body and thus together but also providing the means for exerting significant axial compression against the olive within the nut as its interior threads 26 (for nut 20) are brought into engagement with the corresponding threads of a respective hollow shank 8 and tightened thereon.
  • the reason that compressive force on the olive, and thus in turn on the pipe around which the olive is disposed is that the annular end flanges have an internal diameter which, although of course necessarily being greater than the pipe external diameter, is less than at least the diameter of the exteriormost surface of the olive.
  • the olive is forced and possibly also swaged into and forced within the hollow shank of the fitting, andas it is so swaged, it creates both a seal between the outer surface of the pipe it surrounds and the shank 6, 8, and a mechanical connection between the fitting and the exterior surface of the pipe and thus the pipe itself, as is well known in the art.
  • Grab ring 30 is of unitary construction and will usually be formed by simple pressing, stamping or punching operations carried out on sheets of stainless steel or aluminium or other suitable metal or alloy.
  • the ring comprises a continuous exterior annular periphery 32 from which project, inwardly and also slightly vertically upwardly of said periphery, a plurality of tongues 34, each of equal length, width, thickness, inclination and orientation, and which thus together effectively define a notional circular aperture indicated by dotted line 36 about the axial centre of the grab ring, and axially displaced from the plane of the periphery 32 by an amount equal to the axial component of the length "I" of each tongue dimension, i.e.
  • FIG. 2B an alternate type of grab ring 40 is shown having a similar general construction a nd principle of operation to that of grab ring 30, but for grab ring 40, the tongues are slightly more resilient, and the manufacturing method is slightly different.
  • ring 40 is formed from an initially tubular cylindrical metal workpiece at one end of which a rotary cutter removes intermittent portions of material from between the tongue portions 42 which thus remain.
  • the tongue portions are all forcibly bent back on themselves through an angle of ( 180°- 9), where 9 is the required angle of inclination of the tongue with the cylindrical axis of the ring. It has been suggested that this latter type of grab ring can significantly more robustly resist pipe extractions from within the grab ring after partial insertion therethrou gh.
  • first and second sub-parts generally indicated at 50 and 70 respectively, according to one embodiment of the present invention.
  • sub-parts 50, 70 are broadly identical in shape and configuration and form two halves of the safety device as a whole and which, in use, is adapted to be disposed completely over and around at least one end of the compression fitting of Figure 1 as will become apparent from the following description.
  • Both sub -parts 50, 70 are essentially hemi-cylindrical in cross-section so that when brought together in overlying relationship to complete the safety device, which is thus, in this embodiment at least, essentially cylindrical.
  • each sub-part can be notionally divided into two axially distinct regions, a first region 50A, 70A and a second region 50B, 70B.
  • first region 50A, 70A there is provided firstly a relatively deep hemi-cylindrical cavity 50A-1 , 70A-1 defined axially at either end firstly by inwardly projecting flange means in the form of a semi -annular collar 50A-2, 70A-2, and secondly, at the alternate axial end of the hemi -cylindrical cavity, an inwardly projecting shoulder 50A-3, 70A-3.
  • cavities 50A-1, 70A-1 are essentially hemi-cylindrical
  • the first region 70A of sub-part 70 is provided with a pair of axial aligned locating ribs 70A-4, 70A-5, which stand proud above the diametral plane of the generally hemi-cylindrical sub-part 70
  • sub-part 50 is provided with a pair correspondingly sized and shaped rebates on either side of the hemi -cylindrical cavity, one of which 50A-4 can clearly be seen in Figure 3.
  • the ribs are received in the rebates and advantageously provide the safety device as a whole, particularly in the first regions of the respective sub -parts with improved mechanical resistance to hoop stress and any other forces which may tend to circumferentially expand the safety device in use.
  • the cooperating, interlocking nature of the ribs and rebates facilitates easy and assured location of one sub-part on and over the other, and ensures the correct juxtaposition, both axially and laterally, of both sub-parts, and when said features are properly engaged, ensures that the remainder of the sub-parts can be brought together such that their planar axial surfaces can assume their desired mating relationship with one another.
  • any combination of ribs and rebates which cooperate in this manner is within the contemplation of the present invention. For example, only a single rib and rebate combination may be required, or one rib and one corresponding rebate may be provided on each sub-part, and such locating and interlocking features may equally be provided in the second region of each sub part as opposed to the first.
  • each sub-part 50, 70, sub-part 50 is provided with two pairs of screw receiving recesses, 50B-1, 50B-2, whereas sub-part 70 is provided with two pairs of corresponding apertures 70B-1 , 70B-2, to which access from the underside (as illustrated in Figure 4) is facilitate by means of rebates, one pair of which are referenced at 70B -1A, 70B-2A, provided in the exterior cylindrical surface of that sub -part. Similar rebates are of course provided for apertures 70B-1 , 70B-2.
  • the second regions 50B, 70B, of the sub-parts 50, 70 are also essentially hemi-cylindrical in cross-section, and internally include hemi-cylindrical inner surfaces 50B-3, 70B-3 which are essentially identical and shape and size, and discontinuous in that they are both interrupted at the same positions along their axial length by hemi-cylindrical slots 50B-4, 70B-4 adapted to receive frictional engaging means as will be later described.
  • Each slot is defined by axially spaced apart end walls 50B -5, 50B-6, 70B-5, 70B- 6 respectively, and as can be seen from the figures, end walls 50B-6, 70B-6 are radially shorter in length than oppositely disposed end walls 50B-5, 70B-5, and arejoined to the inner hemi-cylindrical surfaces 50B-3, 70B-3 along inwardly chamfered surfaces 50B-7, 70B-7, the reasons for which will become apparent.
  • the direction of the chamfer is also important, and considered to be "inward” because it is directed away from the axially most proximate free end of each sub -part and towards the more axially remote free end, that the chamfered surface is disposed within the second regions of each sub-part but directed towards the first regions thereof.
  • Figures 3 and 4 thus illustrate all the relevant features of the two sub -part halves of the safety device of the present invention, with the exception of the frictional engagement means which are adapted to be received in at least one, and most preferably both slots.
  • the frictional engagement means may be provided in a wide variety of different forms.
  • the frictional engagement means are ideally provided by semi -, or more preferably slightly less (e.g. subtending an angle between the notional radii at their ends of about 160-175 degrees) than semi-annular grab-ring halves.
  • a truly semi-annular grab-ring half would subtend an angle of 180 degrees between its notional end radii.
  • the frictional engagement means adapted to be received by and fully inserted and seated within slots 50B-4, 70B-4 could be provided by either style of grab ring illustrated in Figures 2A, 2B and having a diameter equal to the twice the radial depth of the said slots, and very simply cut in half, or having segments cut therefrom having a radial angle of between 160-175 degrees such that that segment would substantially occupy the majority of the hemi -cylindrical slot into which it was subsequently inserted.
  • the chamfered surfaces 50B-7, 70B-7 may provide their possible functions. Firstly, such surfaces allow for the grab-ring portion to be inserted only, or at least most easily, in the correct orientation, where the tongues are disposed above or, in some embodiments on, the inclined surfaces and in broadly parallel relationship thereto. In the case where there is some small clearance between the tongues and respective adjacent inclined surface, it will be appreciated by the skilled person that allows for some movement of the tongue, for example as the tongue bends about its root, towards the inclined surface, which thus effectively acts to limit such movement, if or when the tongue comes into contact therewith, for example during use. Thus, in one embodiment, the inclined surfaces permit for easy insertion of the grab ring portions with sufficient clearance for the tongues thereof.
  • some length of the inclined tongues of the grab ring may rest upon and thus be supported by said inclined surfaces upon insertion .
  • each grab-ring portion must be inserted into a respective slot of either or both sub -part in the correction orientation.
  • the length and inclination of the tongues of the grab rings must be selected such that some portion of the tongues project beyond the slot in which the grab ring portions are provided, and into the hemi-cylindrical channel defined by the surfaces 50B-3, 70B-3 of the first regions of each sub-part.
  • grab rings such as described provide a ready, simple and inexpensive frictional engagement means
  • an elastically compressible composition or material may be considered, such as a rubber or rubberised polymer composition, possibly having its frictional and/or abrasive quality enhanced by some additive, such as sand or other quartz or silicate-based granules.
  • substantially semi-annular inserts of such a material of appropriate size could be inserted within and fully seated within the slots, and provided that some portion of the insert stood proud of the slot edges, the inserts would engage with and successfully restrain the pipe with which they came into contact when the sub-parts of the fitting were brought together in position to complete the safety fitting.
  • the frictional engaging means could be integrally formed with the sub-parts, and be constituted of a small raised semi-annular rib in place of the or each slot.
  • the raised rib would of course only be required to project inwardly of the hemi -cylindrical channel of the second region of the or each sub part by a very small amount, e.g. 0.2-3mm, and would naturally be elastically compressible on account of being formed of the plastics material of which the remainder of the sub-part would also be formed.
  • such a raised semi -annular rib may additionally be integrally formed, for example by moulding, with its innermost cylindrical contact surface, i.e. that surface adapted to come into contact with the pipe exterior surface, frictionally enhanced, for example with a frictionally enhancing surface pattern or by some form of stippling.
  • frictional engagement means are provided, and in the most preferred embodiment, they are provided by one and most preferably two substantially semi-annular grab ring portions inserted into and fully seated within the slots. 50B-4, 70B-4 as previously described, and whose functionality can more readily be understood with reference to Figure 5.
  • sub-part 50 is shown in position over and around one end of the compression joint of Figure 1 in assembled condition, prior to the alternate sub-part 70 being brought into overlying relationship thereon and clamped thereto, such latter actions effectively completing the safety device of the present invention.
  • the cavity 50A-1 of the sub-part is of a sufficient length and radial depth to be able to receive and accommodate substantially the entire lower half of the compression nut 18 and its annular flange, and critically, this is achieved with the collar 50A-2 being disposed behind at least laterally projecting rear surface of the nut 18.
  • the sub -part may be designed such that the collar 50A-2, or some functionally equivalent aspect of the sub-part, is disposed behind some other similarly laterally projecting surface of the compression fitting.
  • the collar could be designed such that some portion of it engaged with and behind one or more of the laterally projecting surfaces of one or more of the threads 6, or even behind the nut 20, provided of course it was not desired to attach any similar safety fitting to this end of the compression joint.
  • the present invention only really requires that one or both sub-parts of the safety device have some means which can be disposed behind some laterally projecting surface of the compression fitting which thereby effectively anchors the safety device as a whole to the compression fitting, once completely assembled with both sub-parts in overlying relationship and connected to one another, and effectively prevents it from sliding away from and off the relevant end of the compression fitting over which it is provided and within which a pipe 10 is inserted and connected.
  • laterally projecting in this context should be understood to means that whatever surface is being described in this manner extends at least to some extent in the plane which is substantially orthogonal to a relevant longitudinal axis of both the compression fitting and the relevant pipe inserted therein and connected thereto, and outwardly away from those components.
  • the second region 50B of the sub-part 50 in particular the hemi-cylindrical channel thereof, forms a very snug fit around pipe 10, and furthermore that the slot 50B-4 is now illustrated with a substantially semiannular grab ring portion 50B-8 inserted and fully seated therein.
  • the majority of the length of the tongues of said grab-ring portion may either be disposed generally parallel to but separated from the chamfered surface 50B-7 ( Figure 5A in particular), or they may both rest on and be supported by the chamfered surface 50B-7 of the slot.
  • the tips of said tongues project beyond the end of that surface and, as illustrated, directly engage with the exterior surface of the pipe 10.
  • the pipe is relatively securely anchored within the safety fitting as a result of the frictional and/or mechanical biting engagement of the tongue ends with the exterior surface of the pipe. Therefore, should the pipe experience any fluid shock or other force tending to separate it from the compression joint, such motion is substantially prevented if not rendered largely impossible because of the combined action of both the barb-like engagement of the tongue ends with the pipe exterior surface, and the firm anchoring of the sub-part halves of the safety device to the compression fitting itself.
  • the corresponding sub-part 70 is simply disposed, in identical orientation to that of sub-part 50, over and around the end of the compression fitting 4, and the two sub-part halves may then be simply screwed together by means of screws, one of each of the two pairs used being referenced at 80, so that the two sub - parts of the safety device are effectively clamped together over and around the relevant end of the compression fitting and the pipe 10 connected therein and thereto.
  • the majority of compressing fittings are made in brass, and the majority of pipework is of copper, so if the sub-parts of the safety device are manufactured in a white plastics material, it will be advantageously immediately evident to anyone inspecting a compression fitting to see that one or more safety devices has been fitted thereto.
  • the sub-parts could of course be made in any desired colour of plastics or other material.
  • the sub-parts could be colour coded according to fluid or the temperature thereof being carried in the pipes they secure.
  • a red safety fitting could being indicative of pipework carrying hot fluids, blue indicative of cold fluids, and yellow indicative of gas.
  • safety fitting 90 comprises two sub -part halves 92, 94 of broadly identical interior and exterior shape, design and configuration to corresponding aspects of sub-parts 50, 70 described above, except that in this embodiment, both sub-parts 92, 94 are integrally formed with one another and effectively form a one-piece safety device of unitary construction, as each sub-part is joined to the other along a thin narrow flexible resilient web of (ideally) plastics material, 96 (shown hatched in the figure for clarity), and against the resilience of which, one sub part can be folded so as to automatically brought into the correct axial and lateral overlying relationship with the other sub-part.
  • sub part 92 is provided with a snap-fit tongue and hook formation 98
  • opposing sub-part 94 is provided with a corresponding rebate and underlying ledge (not shown) formation at an axial position along that edge of sub-part 94 corresponding to the position of formation 98 provided along the opposite axially parallel edge of sub -part 92.
  • Other types of similar snap -fit formations are of course possible, and the skilled person will immediately recognise that any such type of mutually cooperating, manually connectable and in preferred embodiments, also manually releasable formations allow for the safety device as a whole to be very quickly, simply and manually connected to a compression or other pipe fitting without the need for a screwdriver or other tool.
  • the safety device of Figure 10 can easily be slid behind any compression fitting when in the "lay -flat" condition illustrated in which each sub-part half is disposed laterally adjacent one another, and then when one or other of the sub-parts is appropriately positioned underneath a relevant end of the compression fitting (See for example Figure 5), the other sub-part half can simply be rotated about the flexible resilient web 96 and into position over the first sub-part, and then connected manually thereto by pressing the two sub-parts together such that the formation 98 successfully and in snapfitting manner engages completely and underneath corresponding formation 100.
  • the safety device could equally be used on both ends of such a fitting.
  • the safety device could be enlarged to cover both ends of the fitting.
  • the safety device would again comprise two sub-parts, but each sub-part would then possess one or more first regions which would include one or more cavities to receive and accommodate the compression fitting and its various parts, and a pair of secondary regions, disposed towards the ends of each sub-part and which would be configured almost identically to the second region of the sub-parts of the primary embodiment described above.
  • inwardly projecting flange means would of course be still be required to be provided so that the safety device as a whole would still be firmly anchored to, over and around the compression fitting, or more accurately certain aspects of it which projected laterally outwardly therefrom and thus provided a surface behind which the flange means could be disposed and which could thus act as a reaction surface therefor.
  • many other different shapes and configurations of sub-parts may be possible, particularly for compression or other pipe-receiving fittings which are occasionally and unpredictably prone to fail.
  • the skilled person could easily design suitable cooperating sub-parts of a safety device to accommodate almost any type of pipe fitting, for example the common T-shaped or elbow joints.
  • a safety fitting for commercial, industrial and large scale domestic compression joints comprises first and second parts which are adapted to be brought together around, firstly, one end of any type and shape of compression joint, and secondly around the exterior surface of one pipe retained by within said compression joint.
  • the respective parts of the safety fitting are substantially identical in that both are p rovided internally with hemi-cylindrical cavities of differing diameters so that when the two parts are brought together two adjacent cylindrical cavities of different diameters are defined within the safety device.
  • the first, larger cylindrical cavity is sized according to the compression joint and the retaining nut thereon which retains the pipe in place, whereas the second cylindrical cavity is sized according to the pipe diameter.
  • each half-part of the safety fitting in the region thereof which is diametrically sized to the pipe, there is provided a shallow transverse, relative to the cylindrical axis of the safety fitting, slot which receives therein a semi -annular metallic grab ring portion, orientated such that the plurality of tongues provided thereon and which protrude therefrom are inclined and directed towards the more remote free end of the respective part of the safety fitting in which it is provided, such that, in use, the free ends of the grab ring tongues not only firmly, resiliently engage with the exterior surface of the pipe, but also are directed towards the body of the compression joint such that they act as restraining barbs on the pipe in the event that said pipe tries to work loose, and thus away from the compression joint.
  • the restraining barb action of the tongues of the grab ring portions on the pipe are counteracted by the fact that the safety fitting as a whole is snugly clamped around the pipe retaining nut on the compression fitting.
  • the resulting arrangement is that the safety device provides an incredibly robust mechanical contingency connection between the pipe and compression joint.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

Un raccord de sécurité pour joints à compression commerciaux, industriels et domestiques de grande dimension est divulgué. Le raccord de sécurité comprend des première et seconde parties qui sont conçues pour être rapprochées l'une de l'autre autour, d'une part, d'une extrémité de joint à compression de tout type et forme, et d'autre part autour de la surface extérieure d'un tuyau retenu par ledit joint à compression. Les parties respectives du raccord de sécurité sont sensiblement identiques en ce que les deux sont pourvues à l'intérieur de cavités semi-cylindriques de diamètres différents, de telle sorte que lorsque les deux parties sont amenées ensemble, deux cavités cylindriques adjacentes de diamètres différents sont délimitées à l'intérieur du dispositif de sécurité. La première cavité cylindrique, plus grande, est dimensionnée en fonction du joint à compression et de l'écrou de retenue sur ce dernier qui retient le tuyau en place, tandis que la seconde cavité cylindrique est dimensionnée en fonction du diamètre de tuyau. À l'intérieur de chaque demi-partie du raccord de sécurité, dans sa région qui est diamétralement dimensionnée par rapport au tuyau, il est prévu une section transversale peu profonde, par rapport à l'axe cylindrique du raccord de sécurité, fente qui reçoit à l'intérieur de cette dernière une partie bague de préhension métallique semi-annulaire, orientée de telle sorte que la pluralité de languettes disposées sur ces dernières et qui font saillie à partir de ces dernières sont inclinées et dirigées vers l'extrémité libre plus éloignée de la partie respective du raccord de sécurité dans lequel il est fourni, de telle sorte que, lors de l'utilisation, les extrémités libres des languettes de bague de préhension non seulement fermement, viennent en prise de manière élastique avec la surface extérieure du tuyau, mais sont également dirigées vers le corps du joint à compression de telle sorte qu'elles agissent comme des barbules de retenue sur le tuyau dans le cas où ledit tuyau chercherait à se desserrer, et ainsi à l'opposé du joint à compression. Dans le cas où le tuyau essaie effectivement de se desserrer du joint à compression, l'action des barbelures de retenue des languettes des parties bague de préhension sur le tuyau est compensée par le fait que le raccord de sécurité dans son ensemble est serré de manière ajustée autour de l'écrou de retenue de tuyau sur le raccord de compression. L'agencement qui en résulte est que le dispositif de sécurité fournit une liaison mécanique pour imprévus mécaniques robuste entre le tuyau et le joint à compression.
PCT/EP2021/073043 2021-08-19 2021-08-19 Raccord de sécurité pour joint à compression WO2023020695A1 (fr)

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PCT/EP2021/073043 WO2023020695A1 (fr) 2021-08-19 2021-08-19 Raccord de sécurité pour joint à compression

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2029325A (en) 1930-12-17 1936-02-04 Auto Research Corp Compression tubing coupling
US2225208A (en) * 1939-04-20 1940-12-17 Merla Tod Company Pipe coupling
US4260182A (en) 1979-12-05 1981-04-07 Emerson Electric Co. Compression fitting
US4438995A (en) * 1981-07-27 1984-03-27 Frank A. Cristell Housing with frangible locking elements
EP1821021A2 (fr) 2006-02-21 2007-08-22 John Guest International Limited Améliorations portant sur ou concernant des raccords de tuyaux
US20150069753A1 (en) * 2013-09-10 2015-03-12 Maroko Limited Advancements in mechanical sealing apparatus
US20160069504A1 (en) * 2014-09-08 2016-03-10 Airbus Operations Limited Locking device
GB2538448A (en) 2014-05-07 2016-11-16 Pegler Yorkshire Group Ltd Push-fit pipe coupling

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2029325A (en) 1930-12-17 1936-02-04 Auto Research Corp Compression tubing coupling
US2225208A (en) * 1939-04-20 1940-12-17 Merla Tod Company Pipe coupling
US4260182A (en) 1979-12-05 1981-04-07 Emerson Electric Co. Compression fitting
US4438995A (en) * 1981-07-27 1984-03-27 Frank A. Cristell Housing with frangible locking elements
EP1821021A2 (fr) 2006-02-21 2007-08-22 John Guest International Limited Améliorations portant sur ou concernant des raccords de tuyaux
US20150069753A1 (en) * 2013-09-10 2015-03-12 Maroko Limited Advancements in mechanical sealing apparatus
GB2538448A (en) 2014-05-07 2016-11-16 Pegler Yorkshire Group Ltd Push-fit pipe coupling
US20160069504A1 (en) * 2014-09-08 2016-03-10 Airbus Operations Limited Locking device

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