CA1105520A - Pipe joint - Google Patents
Pipe jointInfo
- Publication number
- CA1105520A CA1105520A CA322,929A CA322929A CA1105520A CA 1105520 A CA1105520 A CA 1105520A CA 322929 A CA322929 A CA 322929A CA 1105520 A CA1105520 A CA 1105520A
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- annular
- end portion
- joint
- clamping 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.)
- Expired
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- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
- Flanged Joints, Insulating Joints, And Other Joints (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
There is disclosed a pipe joint comprising a first pipe having an end portion engaged as a snug fit in a concentric end portion of a second pipe. The pipes have, at positions spaced from their adjacent ends, external annular ribs with corresponding internal annular grooves, an annular seal being accommodated in the annular groove of the outer pipe between the outer pipe and the inner pipe.
A clamping ring which spans the annular ribs of the two pipes comprises two arcuate parts connected end to end by a hinge and having at their ends remote from the hinge outwardly turned edge formations which are received in a wedge-shaped channel member and engage relatively inclined opposing side walls of the channel member. The clamping ring can simply be closed around the pipe joint by relative pivoting of the two arcuate parts and can be retained by sliding the wedging member, in a direction parallel with the axis of the pipe joint, over the edge formations at the ends of the arcuate parts remote from the hinge.
There is disclosed a pipe joint comprising a first pipe having an end portion engaged as a snug fit in a concentric end portion of a second pipe. The pipes have, at positions spaced from their adjacent ends, external annular ribs with corresponding internal annular grooves, an annular seal being accommodated in the annular groove of the outer pipe between the outer pipe and the inner pipe.
A clamping ring which spans the annular ribs of the two pipes comprises two arcuate parts connected end to end by a hinge and having at their ends remote from the hinge outwardly turned edge formations which are received in a wedge-shaped channel member and engage relatively inclined opposing side walls of the channel member. The clamping ring can simply be closed around the pipe joint by relative pivoting of the two arcuate parts and can be retained by sliding the wedging member, in a direction parallel with the axis of the pipe joint, over the edge formations at the ends of the arcuate parts remote from the hinge.
Description
2 ~
TJ~S IN~NTION relates to pipe ~oint6 and is particularly, but not exclusively, applicable to the formation of ~oints between rigid thermo-plastics material.
It i8 known to effect joints between the ends of rigid 5 thermc-plastics pipes in ~arious ~ays, for example by th~
use of solvent cements or by fitting injection moulded end fittings to the pipes, and ~oining the pipe~ by securing the respective end fittings together by appropriate Recur-ing means.
The use of solvent cements to form joints between rigid thermo-plastics pipes prevents subsequent disassembly Or the parts cemented to~ether without dama6re, entails an inevi~able lapse Or time before a joint is ready for ser~ice and is not practicable with some types of thermo-plastics materials. ~urthermore, unless end fittings are employed, it is difficult to provide, by the use of sol~ent cements~
an end-to-end joint between thermo-plastics pipes of the same diameter 1~hich has adequate strength to resist axial forces between the pipes connected or to resist tra~sverse bending forces applied to a ~oint. The use o~ injcction moulded end fittin~s may avoid this disadvantage but of course entalls additional e~pense.
It ~8 ~n object of the present invention to provide an improved pipe ioint by means of which the above noted dis-2~ advantages may be a~oided and which is simple and economicalin construction. According to the invention there is provided a mechanical pipe joint comprising, a first pipe having an end portion affording one end of the first pipe, r~
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a ~econd pipe having an end portion within which said end portion of said first pipe is snugly received, said end portion of said second pipe affording one end of said second pipe, each ~a~d pipe having, on ~ts exter~or, an annular rib extending around the pipe and coaxial therewith, each said rib being at a location spaced from the end of the respective pipe afforded ~y the respective end portion, the joint further including a clamping ring encircling the two pipes and spanning said annular rib~ of the two pipes, a respective flange, extending toward the axis of the pipes being provided at each of the two axial ends of t~e clamping ring, each said flange engaging t~at flank of a respective one of said annular ri~s which is furthest from the other of said annular ri~s, each said pipe ha~ing an internal annular groove at an axial pos~tion corresponding to the external annular rib thereon, said end portion of said first pipe extending at least partly across said annular groove ~n said second pipe to define an annular space ~etween a wall of said annular groove in said sec~nd pipe and the adjacent part of the exterior of said end portion of the first pipe, and an annular seal disposed in said annular space.
The clamping ring is preferably formed of two arcuate parts flexi~ly connected at their one ends~ for example by a hinge arrangement and provided at their other ends with formations which, in the assembled ~oint, are engaged by a channel-shaped wed~ring mcmber slid over said formations in a direction substantially parallel ~Yith the longitudinal axes of the pipes at the Joint.
The flanks of said annular ribs engaged by the ~lan~es of the clamping ring are preferably inclined with resp~ct to the ax~3 of the pipe joint and the flanges of the clamping ri~g correspondingly inclined in such a way that a circumferential clamping forcc applicd to the clamping ring acts to wedge the two pipes towards each other.
An embodiment of the invention is described below with reference to the accompanying drauin~s in which:
~ igure 1 is a vicw in a~ial scction o~ a pipe joint cmbod~ri~r thc i~lvnntion, ~' SZ~
Figure 2 i8 a view in half axial ~ection of a modified pipe ~oint embodying the invention, Figure 3 i~ a cro B ~ - sectional view, as seen along the line III-III in Figure 1, of the clamping ring and wedging member only, forming part of the pipe ~oint of ~igures 1 and 2, and Figure 4 i9 a side elevation view of a wedging member used to secure the clamplng ring.
Referring to Figure 1, a joint between the ends of two cylindrical pipes 10 and 12 of rigid thermoplastics material i~ effected by deforming respective end portions of the pipes 10 and 12, whilst softened under the action of heat~
to the respective forms shown, 80 that the pipe 12 has a cylindrical end portion 14 which i~ of the same diameter as the ma~or portion of the pipe 12 and is separated from the major portion of the pipe 12 by an annular deformation 15 while the pipe 10 ha~ a cylindrical end portion 16 of a diameter greater than that of the ma~or part of the pipe 10 and having an internal dlameter such that the end portion 14 can be fitted snugly within the end portion 16 as shown in ~igure 1. The end portion 16 is separated from the ma~or portion of the pipe 10 by an annular deformation 17.
Each of the annular deformations 15, 17 provides, on the exterior of the respective pipe 12, 10, a respective annular rib having at it~ crest an axially ~hort cylindrical external surface substantially coaxial with the pipe and conically sloping flanks extending re~pectively from the crest to the cylindrical surface of the major part of the pipe and from the crest towards the respective end portion 1~ or 16. Similarly, each annular deformation 15, 17 pro-vides on its interior an annular groove of a form comple-mentary with that of the rib on the exterior of the respective pipe.
Thus each said annular groove comprise~ an axially short ~urface which is cylindrical about the axis of the re~pective pipe 10, 12 and forms the bottom of the groove, and conically inclined walls extending respectively from 1 1C~5S20 the bottom of the groo~e to the major portion of the re~pectl~e pipe and to the end portion of the respective pipe In ~igure 1, the bottom of the groove provided by deformation 17 i8 indicated at 24, the conically inclined wall extending to the major portion of tube 10 is indicated at 26 and the conically inclined wall extending to the end portion 14 i8 indicated at 22.
It will be noted that the annular deformation 15 on the pipe 12 provides, in the region of the transition from the end portion 14 to the annular deformation 15, a radially extending shoulder 20 on the exterior of the pipe and facing towards the free end of the end portion 14. The free end of the end portion 16 of pipe 10 abuts this shoulder 20 to limit movement of the pipes 10 and 12 towards each other as shown in Figure 1.
The relati~e lengths of the end portions 14 and 16 are such that~ in the position shown in Figure 1, the end portion 14, on the lnterior of the pipe 10, 0xtends partially over the annular groove provided by the deformation 17 and, in particular, extend~ over the conically inclined wall 22 of thi~ groove, further extends over the bottom 24 of this grooYe and partly oYer the other conically inclined wall 26 of thi~ groove. There is thus defined between the end part of the end portion 14 and the groove provided by the annular deformations 17 an annular recess in which is accommodated an a~nular elastomeric seal 28 which is generally U-shaped in half axial ~ection with the channel defined between the arms of the U facing toward~ the conically sloping wall 26.
The radially outer arm of the U fit~ snugly against the bottom 24 of the groove provided by deformation 17 whilst the other limb of the U bears snugly again~t the cylindrical external surface of the end portion 14.
The two pipes 10 and 12 are held together in the joint by a clamping ring 30 which extends around the joint and spans both defo~mations 15 and 17. Referring to Figure 3, the clamping ring 30 compri~es two similar arcuate parts 30a and 30b which are formed as pressings in sheet steel 11~55~0 and which are pivotally connected by a hinge arrangement 40. Each said arcuate part includes a ma~or, part cyllndri-cal portion 32, the axls of curvature of the part cylindri-cal portion being parallel wlth the pivotal axis of hinge arrangement 40, the axeR of curvature of portions 32 being coincident in the position shown in Figure 3 and being indicated at 31 in Figure 3.
Over the ma~or part of the angular extent of each portion 32 about its axis of curvature, part conical flanges 34, 36 are provided at axially extreme ends of the portion 32, the axis of curvature of these part conieal flanges corresponding with that of the re~pective portion 32, and the flanges 34, 36 extending from the respective portion 32 towards the axis of curvature of the latter.
Thus each arcuate part 30a, 30b provides on its concave side, a segment of an annular channel about the axis of curvature of the respective portion 32, the channel being open toward~ the last mentioned axis. When the clamping ring i8 in its closed position around the pipes 10, t2~
the axes of curvature of the portions 32 of the part~ 30a, 30b substantially coincide with each other and with the axis of the pipes 10, 12 so that the parts 30a, 30b provid~
respective segment~ of the same annular channel about the axis of the ~oint and which cha~nel receives the ribs provided by annular deformation~ 15 and 17. A~ ~how~ in Figure 1, the major part of the axial length of the clamping ring is provided by the cylindrical portions 32, which ln the assembled joint are sub~ta~tially coaxial with the pipes 10 and 12, extend from the deformation 15 to the deformation 17 and are spaced radially outwardly therefrom, the conically inclined flanges 34 and 36, bearing against the ribs provided by deformations 15 and 17 re~pectively. The flange 36 has the same inclination with respect to the axis of the pipe joint as tne 510ping flank of the deforma'ion 17 which is furthest from the defo~mation 15 and bears against the extsrnal surface provided by the las* mentioned flank.
S~milarly, the flange 34 has the same inclination as that ll(~S5ZO
flank of the annular deformation 15 which i5 furthest from the deformation 17 and the flange 34 beara against the e~ternal surface presented by the lnst mentioned flank. It wlll be appreciated that by virtua of the inclination of the flange~ 34, 36 and the flank~ of the deformations 15, 17 against which they bear, a circumferential tens$on in the clamping ring 30 will give rise to forces urging the end portion 14 further into the pipe 10 and thus urging the end face of the end portion 16 towards engag~ment with the shoulder 60. Thus forces urging the pipes 1~ and 12 axially towards each other are absorbed compressively by abutment of the end face of portion 16 with the shoulder 20 whilst forces tending to separate the pipe~ 10 and 12 ~xially are absorbed by the steel clamping ri.ng 30.
Referring again to ~igure 3, at the circumferential end of each arcuate part 30a, 30b adjacent the hinge arrange-ment 30, the portion 32 i~ extended beyond the adjacent circumferential ends of the flanges 34, 36 and i~ bent at its end to form, with the correspondingly bent end of the portion 32 of the other arcuate part and a hinge pin 42, the hinge arrangement 40. The hinge arrangement 40 allows the clamping ring to be opened to allow it to be slipped over an assembled pipe joint and thereafter closed about the joint. The manner in which the clamping ring ls held clo~ed about the pipe ~oint is illustrated in ~igures 3 and 4. At the circumferential end of each arcuate part 30a, 30b remote from the hinge arrangement 40, the respective portion 32 is extended beyond the adjacent circumferential ends of the respect1ve flanges 34, 36 and the extended portion l~ bent outwardly in a rever~e sen~ to the curva-ture of the respective arcuate part; to provlde a generally channel shaped formati~n 44 running generally parallel with the axis of curvature of the respective portion 32, the wall 46 of each channel formation 44 which is furthest from the hinge arrangement 40 terminating. in a respective free edge 48. The edges 48 of the walls 46 of the two arcuate part~
are so formed that when the clamping ring is in its closed position, with the relative positions of the parts 30a, 30b being as shown in Figure 3, the free edges 48, as viewed in the direction of the arrow 50 in ~igure 3 are inclined equally but in opposite sense3, with respect to the direction of the axe~ of curvature of the respective arcuate part 30a, 30b. Thus, in the closed position of the clamping ring illustrated in Figure 3 the edges 48 slope t~wards each other from one axizl 0nd of the clamp to the other, as viewed in the direction of arrow 50 in Figure 3.
The clamping ring is held clamped circumferentially around the joint by means of a generally channel-section member 52, the member 52 having a flat wall 53 forming the base of the channel and side walls 54 which, as ~iewed in cross section in Figure 3, are curved so a~ t~ extend towards each other at their free ends so that the channel is narrower at its mouth than at the position intermediate its mouth and its base. Each side wall 54 i8 of substantially uniform cross section from one end of the member 52 to the other but the width of the base 53 of the channel tapers fr~m one end of the member 52 to the other and the directions of longitud-inal extension of the two side walls 54 are correspondingly inclined with respect to each other in the longitudinal direction of the channel as shown in Figure 4, the mutual inclination of the directions of longitudinal extension of the side walls corresponding to the mutual inclination of the edges 48 in the closed position of the clamping ring.
When the clamping ring has been closed about a pipe joint, the wedging member 52 is slid over the flanges 46 in a longitudinal direction parallel with the axis of the ~oint, the widest part of the channel provlded by member 52 being engaged over the flanges 46 at the axial end where the free edges 48 of these are closest and the member 5Z thereupon slid in the axial direction, the edges ~8 bearing against the inner surfaces of the side walls 54 and thereby being wedged towards each other as the clamping member is slid along, the clamping member being retained by the inwardly turned SZO
g f`ree edge parts of the side walls 54 engaging in the channels provided by the formations 44.
In the joint of Figure 1, the conically ~loping flanks of the deformations 15, 17 and the corresponding flanges 34, 36 are inclined at 45 with respect to the axis of the pipe joint. A pipe joint of Figure 2 corresponds in ~tructure to that of Figure 1 except that, in the joint of ~igure 2, the flanks of the deformations 15, 17 and ths correspondingly inclined flanges 34, 36 are inclined at 30 with respect to the axis of the pipe joint.
It will be not~d from Figure 1 that any internal fluid pressure within a pipe system incorporating the joint of Figure 1 or Figure 4 will tend to urge apart the lips of the sealing member 28 providing the respective limbs of the U-section, and will also tend to urge the seal into a narrowing part of the annular space accommodating the member 28, said narrowing part being defined between the inclined wall 22 and the exterior of portion 14. The seal i8 thus urged more firmly into contact with the surfaces with which it i~ intended to make sealing engagement, thus ensuring good sealing.
It will be appreciated that, although an internal pressure wlthin a pipe system incorporating the joint shown in Figure 1 or Figure 2 will produce a force tending to ~eparate the pipes 10 and 12 axially~i such a force will be counteracted, as explained previously, by the clamping ring 30.
Furthermore, the axial length of the surface~ of end portions 14 and 16 which are in mutual engagement in the assembled pipe joint is sufficient to afford a high degree of rigidity to the ~oint to withstand transverse bending stresses. The axial length of *he last-mentioned surfaces also affords self alignment of the pipes 10 and 12 in the joint~
In addition~ the joint described ha~ the advantage of being readlly assembled and just as readily disassembled without damage to any of the parts of the joint.
ll~t55ZV
- 1 o -It should be appreciated that the above description, with reference to the drawings, of pipe ~oints embodying the invention ls given by way of non-limitative e~mple only, and that this applies particularly to the clamplng ring construction described wlth reference to Figures 3 a~d 4. The clamping ring may take any of a variety of other possible forms consistent with its function, particularly as regard~ the provision made for opening the ring ~ufficient-ly to position it over the pipe ~oint and the means employed for tensioning the ring circumferentially. However, the general ~ectional shape of the clamping ring illustrated in Figures 1 and 2 iB preferred for pipe ~oints having the form illu9 trated in those figures.
TJ~S IN~NTION relates to pipe ~oint6 and is particularly, but not exclusively, applicable to the formation of ~oints between rigid thermo-plastics material.
It i8 known to effect joints between the ends of rigid 5 thermc-plastics pipes in ~arious ~ays, for example by th~
use of solvent cements or by fitting injection moulded end fittings to the pipes, and ~oining the pipe~ by securing the respective end fittings together by appropriate Recur-ing means.
The use of solvent cements to form joints between rigid thermo-plastics pipes prevents subsequent disassembly Or the parts cemented to~ether without dama6re, entails an inevi~able lapse Or time before a joint is ready for ser~ice and is not practicable with some types of thermo-plastics materials. ~urthermore, unless end fittings are employed, it is difficult to provide, by the use of sol~ent cements~
an end-to-end joint between thermo-plastics pipes of the same diameter 1~hich has adequate strength to resist axial forces between the pipes connected or to resist tra~sverse bending forces applied to a ~oint. The use o~ injcction moulded end fittin~s may avoid this disadvantage but of course entalls additional e~pense.
It ~8 ~n object of the present invention to provide an improved pipe ioint by means of which the above noted dis-2~ advantages may be a~oided and which is simple and economicalin construction. According to the invention there is provided a mechanical pipe joint comprising, a first pipe having an end portion affording one end of the first pipe, r~
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a ~econd pipe having an end portion within which said end portion of said first pipe is snugly received, said end portion of said second pipe affording one end of said second pipe, each ~a~d pipe having, on ~ts exter~or, an annular rib extending around the pipe and coaxial therewith, each said rib being at a location spaced from the end of the respective pipe afforded ~y the respective end portion, the joint further including a clamping ring encircling the two pipes and spanning said annular rib~ of the two pipes, a respective flange, extending toward the axis of the pipes being provided at each of the two axial ends of t~e clamping ring, each said flange engaging t~at flank of a respective one of said annular ri~s which is furthest from the other of said annular ri~s, each said pipe ha~ing an internal annular groove at an axial pos~tion corresponding to the external annular rib thereon, said end portion of said first pipe extending at least partly across said annular groove ~n said second pipe to define an annular space ~etween a wall of said annular groove in said sec~nd pipe and the adjacent part of the exterior of said end portion of the first pipe, and an annular seal disposed in said annular space.
The clamping ring is preferably formed of two arcuate parts flexi~ly connected at their one ends~ for example by a hinge arrangement and provided at their other ends with formations which, in the assembled ~oint, are engaged by a channel-shaped wed~ring mcmber slid over said formations in a direction substantially parallel ~Yith the longitudinal axes of the pipes at the Joint.
The flanks of said annular ribs engaged by the ~lan~es of the clamping ring are preferably inclined with resp~ct to the ax~3 of the pipe joint and the flanges of the clamping ri~g correspondingly inclined in such a way that a circumferential clamping forcc applicd to the clamping ring acts to wedge the two pipes towards each other.
An embodiment of the invention is described below with reference to the accompanying drauin~s in which:
~ igure 1 is a vicw in a~ial scction o~ a pipe joint cmbod~ri~r thc i~lvnntion, ~' SZ~
Figure 2 i8 a view in half axial ~ection of a modified pipe ~oint embodying the invention, Figure 3 i~ a cro B ~ - sectional view, as seen along the line III-III in Figure 1, of the clamping ring and wedging member only, forming part of the pipe ~oint of ~igures 1 and 2, and Figure 4 i9 a side elevation view of a wedging member used to secure the clamplng ring.
Referring to Figure 1, a joint between the ends of two cylindrical pipes 10 and 12 of rigid thermoplastics material i~ effected by deforming respective end portions of the pipes 10 and 12, whilst softened under the action of heat~
to the respective forms shown, 80 that the pipe 12 has a cylindrical end portion 14 which i~ of the same diameter as the ma~or portion of the pipe 12 and is separated from the major portion of the pipe 12 by an annular deformation 15 while the pipe 10 ha~ a cylindrical end portion 16 of a diameter greater than that of the ma~or part of the pipe 10 and having an internal dlameter such that the end portion 14 can be fitted snugly within the end portion 16 as shown in ~igure 1. The end portion 16 is separated from the ma~or portion of the pipe 10 by an annular deformation 17.
Each of the annular deformations 15, 17 provides, on the exterior of the respective pipe 12, 10, a respective annular rib having at it~ crest an axially ~hort cylindrical external surface substantially coaxial with the pipe and conically sloping flanks extending re~pectively from the crest to the cylindrical surface of the major part of the pipe and from the crest towards the respective end portion 1~ or 16. Similarly, each annular deformation 15, 17 pro-vides on its interior an annular groove of a form comple-mentary with that of the rib on the exterior of the respective pipe.
Thus each said annular groove comprise~ an axially short ~urface which is cylindrical about the axis of the re~pective pipe 10, 12 and forms the bottom of the groove, and conically inclined walls extending respectively from 1 1C~5S20 the bottom of the groo~e to the major portion of the re~pectl~e pipe and to the end portion of the respective pipe In ~igure 1, the bottom of the groove provided by deformation 17 i8 indicated at 24, the conically inclined wall extending to the major portion of tube 10 is indicated at 26 and the conically inclined wall extending to the end portion 14 i8 indicated at 22.
It will be noted that the annular deformation 15 on the pipe 12 provides, in the region of the transition from the end portion 14 to the annular deformation 15, a radially extending shoulder 20 on the exterior of the pipe and facing towards the free end of the end portion 14. The free end of the end portion 16 of pipe 10 abuts this shoulder 20 to limit movement of the pipes 10 and 12 towards each other as shown in Figure 1.
The relati~e lengths of the end portions 14 and 16 are such that~ in the position shown in Figure 1, the end portion 14, on the lnterior of the pipe 10, 0xtends partially over the annular groove provided by the deformation 17 and, in particular, extend~ over the conically inclined wall 22 of thi~ groove, further extends over the bottom 24 of this grooYe and partly oYer the other conically inclined wall 26 of thi~ groove. There is thus defined between the end part of the end portion 14 and the groove provided by the annular deformations 17 an annular recess in which is accommodated an a~nular elastomeric seal 28 which is generally U-shaped in half axial ~ection with the channel defined between the arms of the U facing toward~ the conically sloping wall 26.
The radially outer arm of the U fit~ snugly against the bottom 24 of the groove provided by deformation 17 whilst the other limb of the U bears snugly again~t the cylindrical external surface of the end portion 14.
The two pipes 10 and 12 are held together in the joint by a clamping ring 30 which extends around the joint and spans both defo~mations 15 and 17. Referring to Figure 3, the clamping ring 30 compri~es two similar arcuate parts 30a and 30b which are formed as pressings in sheet steel 11~55~0 and which are pivotally connected by a hinge arrangement 40. Each said arcuate part includes a ma~or, part cyllndri-cal portion 32, the axls of curvature of the part cylindri-cal portion being parallel wlth the pivotal axis of hinge arrangement 40, the axeR of curvature of portions 32 being coincident in the position shown in Figure 3 and being indicated at 31 in Figure 3.
Over the ma~or part of the angular extent of each portion 32 about its axis of curvature, part conical flanges 34, 36 are provided at axially extreme ends of the portion 32, the axis of curvature of these part conieal flanges corresponding with that of the re~pective portion 32, and the flanges 34, 36 extending from the respective portion 32 towards the axis of curvature of the latter.
Thus each arcuate part 30a, 30b provides on its concave side, a segment of an annular channel about the axis of curvature of the respective portion 32, the channel being open toward~ the last mentioned axis. When the clamping ring i8 in its closed position around the pipes 10, t2~
the axes of curvature of the portions 32 of the part~ 30a, 30b substantially coincide with each other and with the axis of the pipes 10, 12 so that the parts 30a, 30b provid~
respective segment~ of the same annular channel about the axis of the ~oint and which cha~nel receives the ribs provided by annular deformation~ 15 and 17. A~ ~how~ in Figure 1, the major part of the axial length of the clamping ring is provided by the cylindrical portions 32, which ln the assembled joint are sub~ta~tially coaxial with the pipes 10 and 12, extend from the deformation 15 to the deformation 17 and are spaced radially outwardly therefrom, the conically inclined flanges 34 and 36, bearing against the ribs provided by deformations 15 and 17 re~pectively. The flange 36 has the same inclination with respect to the axis of the pipe joint as tne 510ping flank of the deforma'ion 17 which is furthest from the defo~mation 15 and bears against the extsrnal surface provided by the las* mentioned flank.
S~milarly, the flange 34 has the same inclination as that ll(~S5ZO
flank of the annular deformation 15 which i5 furthest from the deformation 17 and the flange 34 beara against the e~ternal surface presented by the lnst mentioned flank. It wlll be appreciated that by virtua of the inclination of the flange~ 34, 36 and the flank~ of the deformations 15, 17 against which they bear, a circumferential tens$on in the clamping ring 30 will give rise to forces urging the end portion 14 further into the pipe 10 and thus urging the end face of the end portion 16 towards engag~ment with the shoulder 60. Thus forces urging the pipes 1~ and 12 axially towards each other are absorbed compressively by abutment of the end face of portion 16 with the shoulder 20 whilst forces tending to separate the pipe~ 10 and 12 ~xially are absorbed by the steel clamping ri.ng 30.
Referring again to ~igure 3, at the circumferential end of each arcuate part 30a, 30b adjacent the hinge arrange-ment 30, the portion 32 i~ extended beyond the adjacent circumferential ends of the flanges 34, 36 and i~ bent at its end to form, with the correspondingly bent end of the portion 32 of the other arcuate part and a hinge pin 42, the hinge arrangement 40. The hinge arrangement 40 allows the clamping ring to be opened to allow it to be slipped over an assembled pipe joint and thereafter closed about the joint. The manner in which the clamping ring ls held clo~ed about the pipe ~oint is illustrated in ~igures 3 and 4. At the circumferential end of each arcuate part 30a, 30b remote from the hinge arrangement 40, the respective portion 32 is extended beyond the adjacent circumferential ends of the respect1ve flanges 34, 36 and the extended portion l~ bent outwardly in a rever~e sen~ to the curva-ture of the respective arcuate part; to provlde a generally channel shaped formati~n 44 running generally parallel with the axis of curvature of the respective portion 32, the wall 46 of each channel formation 44 which is furthest from the hinge arrangement 40 terminating. in a respective free edge 48. The edges 48 of the walls 46 of the two arcuate part~
are so formed that when the clamping ring is in its closed position, with the relative positions of the parts 30a, 30b being as shown in Figure 3, the free edges 48, as viewed in the direction of the arrow 50 in ~igure 3 are inclined equally but in opposite sense3, with respect to the direction of the axe~ of curvature of the respective arcuate part 30a, 30b. Thus, in the closed position of the clamping ring illustrated in Figure 3 the edges 48 slope t~wards each other from one axizl 0nd of the clamp to the other, as viewed in the direction of arrow 50 in Figure 3.
The clamping ring is held clamped circumferentially around the joint by means of a generally channel-section member 52, the member 52 having a flat wall 53 forming the base of the channel and side walls 54 which, as ~iewed in cross section in Figure 3, are curved so a~ t~ extend towards each other at their free ends so that the channel is narrower at its mouth than at the position intermediate its mouth and its base. Each side wall 54 i8 of substantially uniform cross section from one end of the member 52 to the other but the width of the base 53 of the channel tapers fr~m one end of the member 52 to the other and the directions of longitud-inal extension of the two side walls 54 are correspondingly inclined with respect to each other in the longitudinal direction of the channel as shown in Figure 4, the mutual inclination of the directions of longitudinal extension of the side walls corresponding to the mutual inclination of the edges 48 in the closed position of the clamping ring.
When the clamping ring has been closed about a pipe joint, the wedging member 52 is slid over the flanges 46 in a longitudinal direction parallel with the axis of the ~oint, the widest part of the channel provlded by member 52 being engaged over the flanges 46 at the axial end where the free edges 48 of these are closest and the member 5Z thereupon slid in the axial direction, the edges ~8 bearing against the inner surfaces of the side walls 54 and thereby being wedged towards each other as the clamping member is slid along, the clamping member being retained by the inwardly turned SZO
g f`ree edge parts of the side walls 54 engaging in the channels provided by the formations 44.
In the joint of Figure 1, the conically ~loping flanks of the deformations 15, 17 and the corresponding flanges 34, 36 are inclined at 45 with respect to the axis of the pipe joint. A pipe joint of Figure 2 corresponds in ~tructure to that of Figure 1 except that, in the joint of ~igure 2, the flanks of the deformations 15, 17 and ths correspondingly inclined flanges 34, 36 are inclined at 30 with respect to the axis of the pipe joint.
It will be not~d from Figure 1 that any internal fluid pressure within a pipe system incorporating the joint of Figure 1 or Figure 4 will tend to urge apart the lips of the sealing member 28 providing the respective limbs of the U-section, and will also tend to urge the seal into a narrowing part of the annular space accommodating the member 28, said narrowing part being defined between the inclined wall 22 and the exterior of portion 14. The seal i8 thus urged more firmly into contact with the surfaces with which it i~ intended to make sealing engagement, thus ensuring good sealing.
It will be appreciated that, although an internal pressure wlthin a pipe system incorporating the joint shown in Figure 1 or Figure 2 will produce a force tending to ~eparate the pipes 10 and 12 axially~i such a force will be counteracted, as explained previously, by the clamping ring 30.
Furthermore, the axial length of the surface~ of end portions 14 and 16 which are in mutual engagement in the assembled pipe joint is sufficient to afford a high degree of rigidity to the ~oint to withstand transverse bending stresses. The axial length of *he last-mentioned surfaces also affords self alignment of the pipes 10 and 12 in the joint~
In addition~ the joint described ha~ the advantage of being readlly assembled and just as readily disassembled without damage to any of the parts of the joint.
ll~t55ZV
- 1 o -It should be appreciated that the above description, with reference to the drawings, of pipe ~oints embodying the invention ls given by way of non-limitative e~mple only, and that this applies particularly to the clamplng ring construction described wlth reference to Figures 3 a~d 4. The clamping ring may take any of a variety of other possible forms consistent with its function, particularly as regard~ the provision made for opening the ring ~ufficient-ly to position it over the pipe ~oint and the means employed for tensioning the ring circumferentially. However, the general ~ectional shape of the clamping ring illustrated in Figures 1 and 2 iB preferred for pipe ~oints having the form illu9 trated in those figures.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A mechanical pipe joint comprising, a first pipe having an end portion affording one end of the first pipe, a second pipe having an end portion within which said end portion of said first pipe is snugly received, said end portion of said second pipe affording one end of said second pipe, each said pipe having, on its exterior, an annular rib extending around the pipe and coaxial therewith, each said rib being at a location spaced from the end of the respective pipe afforded by the respective end portion, the joint further including a clamping ring encircling the two pipes and spanning said annular ribs of the two pipes, a respective flange, extending toward the axis of the pipes being provided at each of the two axial ends of the clamping rings, each said flange engaging that flank of a respective one of said annular ribs which is furthest from the other of said annular ribs, each said pipe having an internal annular groove at an axial position corresponding to the external annular rib thereon, said end portion of said first pipe extending at least partly across said annular groove in said second pipe to define an annular space between a wall of said annular groove in said second pipe and the adjacent part of the exterior of said end portion of the first pipe, and an annular seal disposed in said annular space.
2. The joint of claim 1 wherein the clamping ring comprises two arcuate parts, pivotal connection means connecting one end of one said arcuate part to one end of the other said annular part, a respective retaining formation at the other end of each said arcuate part, and a channel-shaped wedging member engaging said retaining formations of the two arcuate parts, co-operating surfaces on said wedging member and said retaining formations extending in directions inclined to the direction of the axis of the joint whereby by thrusting said wedging member in one direction parallel to the axis of the joint the clamping ring can be caused to exert a circumferential clamping effect .
3. A joint according to claim 1 or claim 2 in which the flanks of said annular ribs engaged by the flanges of said clamping ring are inclined with respect to the axis of the pipe joint and the flanges of the clamping ring are correspondingly inclined whereby a circumferential clamping force applied to the clamping ring acts to wedge said two pipes towards each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA322,929A CA1105520A (en) | 1979-03-07 | 1979-03-07 | Pipe joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA322,929A CA1105520A (en) | 1979-03-07 | 1979-03-07 | Pipe joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1105520A true CA1105520A (en) | 1981-07-21 |
Family
ID=4113691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA322,929A Expired CA1105520A (en) | 1979-03-07 | 1979-03-07 | Pipe joint |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1105520A (en) |
-
1979
- 1979-03-07 CA CA322,929A patent/CA1105520A/en not_active Expired
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |