CA1188717A - Pipe joint for preventing separation - Google Patents
Pipe joint for preventing separationInfo
- Publication number
- CA1188717A CA1188717A CA000423643A CA423643A CA1188717A CA 1188717 A CA1188717 A CA 1188717A CA 000423643 A CA000423643 A CA 000423643A CA 423643 A CA423643 A CA 423643A CA 1188717 A CA1188717 A CA 1188717A
- Authority
- CA
- Canada
- Prior art keywords
- stopper
- socket
- spigot
- pipe joint
- housing
- 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
Links
Abstract
ABSTRACT OF THE DISCLOSURE
A pipe joint for preventing separation comprising a holding member connectable to an annular outer flange formed at the end of a socket and surrounding the outer periphery of a spigot outside the socket, the holding member being annular or being adapted to form an annular shape, the holding member being provided on its inner periphery with a tapered surface increasing in diameter toward the socket; a stopper in the form of a ring divided at one portion and provided with an outer peripheral tapered surface increasing in diameter toward the socket and with engaging edges in circumferential rows on its inner periphery, the stopper being interposed between the tapered surface of the holding member and the spigot outer periphery; and tap bolts extending through the holding member at suitable portions along its circumference for pressing the stopper from outside against the spigot outer periphery. Because the stopper is thus shaped, the joint is easy to assemble and manufacture. When the spigot acts to slip off with the tap bolts tightened up, a diametrically constricting force acts on the spigot uniformly circumfer-entially thereof without eny unevenness to reliably prevent separation of the spigot from the socket.
A pipe joint for preventing separation comprising a holding member connectable to an annular outer flange formed at the end of a socket and surrounding the outer periphery of a spigot outside the socket, the holding member being annular or being adapted to form an annular shape, the holding member being provided on its inner periphery with a tapered surface increasing in diameter toward the socket; a stopper in the form of a ring divided at one portion and provided with an outer peripheral tapered surface increasing in diameter toward the socket and with engaging edges in circumferential rows on its inner periphery, the stopper being interposed between the tapered surface of the holding member and the spigot outer periphery; and tap bolts extending through the holding member at suitable portions along its circumference for pressing the stopper from outside against the spigot outer periphery. Because the stopper is thus shaped, the joint is easy to assemble and manufacture. When the spigot acts to slip off with the tap bolts tightened up, a diametrically constricting force acts on the spigot uniformly circumfer-entially thereof without eny unevenness to reliably prevent separation of the spigot from the socket.
Description
'7~
PIPE JOINT FOR PREVENTING SEPARATION
~ . . . = . . _ The present invention relates to pipe joints chiefly for pipes of relatively small diameters, and more particularly to a separation preventing pipe joint having means provided outside a socket for preventing a spigot from slipping off the socket.
Pipe joints for water supply pipelirles, etc.
include those wherein a pressing ring is pressed against an annular packing provided between a packing seat on the lQ inner periphery of the open end of a socket and the outer periphery of a spigot to seal off the connection be~ween the socket and the spigot. With joints of this type, the spigot is likely to slip off the joint, for example when the pipeline is installed in a soft ground or is subjected to earthquake or when the joint is used for connecting pipes at an angle. Accordingly there is the need to provide some means for preventing the slipping off.
U.S~ patent 4,092,036 issued May 30, 1978 to Toshiyuki Sato, et al discloses a separation preventing pipe joint of the type wherein an annular packing is provided between the outer periphery of a spigot and a packing sea~ formed on the inner periphery of the end of a socket. The joint comprises a pressing ring bolted 7~7 -to a,n ou-ter f]an~e a-t the ~ocket end, ~urroundin~ -the spi~o-t ou-l,er periphery ou-t~i-3e the socke-t and havin~ one end pres~ed a.~,~ains-l. the packin~; a plura.lit;y o-~ wed~es providec] be-tween -I;he pre~in~ r:in~ and the spi~ot outer periphery and slli-ta,bl;y arra~ed c:Lrcumferentiall,y -thereo~, ea.ch o~'-the wed~es havin~ en~a~ing ed~es on i-t~ lnner ~ur:~ace; and tap 'bolt~ extendin.~ -throu~h the pre~in~
rin~ a,t csllitable por-ti.ons along it~ circum:Ference for pressin~ the wed~es Erom ou-tside a~ain~t the spl~o-t oul,er periphery~ Since the means f'or preventin~.the spi~ot from ~lippint~ ofY, namely separa.-tion preventin~ mean~, is di.~posed outsi.cle th.e ~ocket, -the pipe ~joint is easier -to assemble and prevents separa.tion more ef-fec-ti.vel,y 'by -the a.ction of -the wed~es than those in which the separa-tion preventin~ means is provided within the socket. 'However, because the wed~e~ a.re separate and independent of one another, the di~closed aoint i~ s-till c~nbersome -to assemble and manu.fac-ture. ~'urther because the spi~o-t outer periphery remains par-tially ou-t of con-tact wi-th the wed~e~ and also because all the tap bolts are n.o-t uni~orm in ~astening force, the spi~ot ou-ter periphery i5 ~ub~ec-ted to uneven pressure. Especially when the tap bol-ts are ti~htened up stron~ly to prevent separation e-ffectively, more unevsn pressure will resul-t. I~ the pipe i~ lined with cement, crack~ will then develop in
PIPE JOINT FOR PREVENTING SEPARATION
~ . . . = . . _ The present invention relates to pipe joints chiefly for pipes of relatively small diameters, and more particularly to a separation preventing pipe joint having means provided outside a socket for preventing a spigot from slipping off the socket.
Pipe joints for water supply pipelirles, etc.
include those wherein a pressing ring is pressed against an annular packing provided between a packing seat on the lQ inner periphery of the open end of a socket and the outer periphery of a spigot to seal off the connection be~ween the socket and the spigot. With joints of this type, the spigot is likely to slip off the joint, for example when the pipeline is installed in a soft ground or is subjected to earthquake or when the joint is used for connecting pipes at an angle. Accordingly there is the need to provide some means for preventing the slipping off.
U.S~ patent 4,092,036 issued May 30, 1978 to Toshiyuki Sato, et al discloses a separation preventing pipe joint of the type wherein an annular packing is provided between the outer periphery of a spigot and a packing sea~ formed on the inner periphery of the end of a socket. The joint comprises a pressing ring bolted 7~7 -to a,n ou-ter f]an~e a-t the ~ocket end, ~urroundin~ -the spi~o-t ou-l,er periphery ou-t~i-3e the socke-t and havin~ one end pres~ed a.~,~ains-l. the packin~; a plura.lit;y o-~ wed~es providec] be-tween -I;he pre~in~ r:in~ and the spi~ot outer periphery and slli-ta,bl;y arra~ed c:Lrcumferentiall,y -thereo~, ea.ch o~'-the wed~es havin~ en~a~ing ed~es on i-t~ lnner ~ur:~ace; and tap 'bolt~ extendin.~ -throu~h the pre~in~
rin~ a,t csllitable por-ti.ons along it~ circum:Ference for pressin~ the wed~es Erom ou-tside a~ain~t the spl~o-t oul,er periphery~ Since the means f'or preventin~.the spi~ot from ~lippint~ ofY, namely separa.-tion preventin~ mean~, is di.~posed outsi.cle th.e ~ocket, -the pipe ~joint is easier -to assemble and prevents separa.tion more ef-fec-ti.vel,y 'by -the a.ction of -the wed~es than those in which the separa-tion preventin~ means is provided within the socket. 'However, because the wed~e~ a.re separate and independent of one another, the di~closed aoint i~ s-till c~nbersome -to assemble and manu.fac-ture. ~'urther because the spi~o-t outer periphery remains par-tially ou-t of con-tact wi-th the wed~e~ and also because all the tap bolts are n.o-t uni~orm in ~astening force, the spi~ot ou-ter periphery i5 ~ub~ec-ted to uneven pressure. Especially when the tap bol-ts are ti~htened up stron~ly to prevent separation e-ffectively, more unevsn pressure will resul-t. I~ the pipe i~ lined with cement, crack~ will then develop in
-2-7:~
-I;he l.ining. In -the case -where the spi~oti is to slip off, -the wedges exert ~rea,ter ~ressure on the spi~ot ou-ter peripher~. ~hus -l,he inevi.-table uneven distri.bution of nressin~ forces even-tual.ly leEId3 -to -the likellhood tha,t -the linl.n~ w~l.l separate o:F'f' ]oca:l,ly.
In vi.ew of -these problems, -the ob~ject o-f -the p-resen-t inven-t:lon i.s to provide a ~epara,-ti.on preventin~
pipe ~oi.nt wh.ich ha.s mearl.s ~rovi.ded outslde a ~ocke-t :f'or prevent-i.ng a. spi~o-t -~rom sl,ipping, o~-F the socket.and which is ea.s;y to assemble and ca,pab].e of reliabl.y preventing separa.tion without en-tai].in~ ob~ecti.ons such a.e crackin~
or separa-tion of the cement lining on the inner periphery of the spi~ot.
rrO fulfill -this obaect, the present invention provides a pipe aoint *or preventin~ separation wherein an annular packing is provided between a paclrin~ seat formed on -the inner periphery of a. socket and the outer periphery of a spigot. The pipe ~oint comprises a. holdin~
member connectable -to an annular outer flange formed at -the end of the socke-t and surroundin~ the spi~ot outer periphery ou-tside the socket, the holding member bein~
annular or bein~ adapted to form an annular sha.pe, the holdin~ member being provided on its inner periphery with a tapered surface h.avi.ng an increasing diameter toward the 30cket; a ~topper in the form of a rin~ divided at 7~
one ~or-t-lon and provided wi.-th an ou-ter peripheral tapered sur~ace having an increa.sing diameter toward the socket a.nd with en~agin.~ edge mea.ns in a plurality o~ circum~er-en-tia.l rows on its i.nner periphery, the stopper being in-terposed be-tween -the inner periphera]. tapered sur~ace o~ the ho]ding member and the spigo-t outer periphery; and tap 'bol-ts extending throu~h -the holding member at sui.table por-tions a].ong i-ts circum:ference -~or pressing the stopper ~rom outside against -the s~igo-t outer peripher.y7 each o-P
-the tap bolts having a :~orward end face parallel -to -the outer periphera]. tapered sur~ace o-~ the stopper.
According to -the construction described above, the stopper is in the ~orm o~ a ring divided a-t one portion ~i~e. having circum~erentially opposed ends), so -tha.t -the aoint is easy to assemble, while the spigot will not be sub~ec-ted to uneven pressllre even if the tap bol-ts are tigh-tened up strongly u.nl.ike -the conventional ~joint. ',rhis eliminates problems, such as separa-tion of the lining.
~urther the uni~orm engagement o~ the engaging edge means with the spigot outer periphery accomplish.ed by tightenin~
up the tap 'bolts strong],y can be ef~ec-ted more tightly by the stopper which exerts a wedging action when the spi~ot is to slip off. Within the limits o~ the strength o-~ the holding member, therefore, it is almost unlikely tha-t the spi.got wi].l separate -~rom the socket.
Accordin~ -to an embodi.men-t of -the invention, -the packlng sea-t is f'ormed on the inner periphery of' the socket end, and. the holding member is an annular pressing ring connec-ted a-t sui-table portions along it~ circumf'erence -to -the ou-ter Elange a-t 1,he socke-t end by fastening members, whereby the end. of' the p:ressing ring opposed to -the socket is pressed against the packing-According to anoth.er embodiment of`-the invention, -the pacl{ing sea.t :i.s posi-ti.oned at a dis-tance ~rom -the open encl f'ace o.~' th.e socket, and -the ho:Lding member comprises a pl~lrality of circular arc housings connected -together in -the ~'orm of' a.n annular ring by bo]..-ts and each having a hook portion engageable wi-th -the outer flange at -the socket end.
Various f'eatures and advantages of' the present invention will become apparent from the Eollowing d.escrip--tion of embodiments given wi-th ref'erence to -the accompany-i.ng drawings, in whic.h:
Fig. 1 is a side elevation in longitudinal section showing a pipe join-t according to a first embodi-ment o:E the invention;
~ig. 2 i~ a fron-t view showing a stopper;
l'ig. 3 is a view in section taken along -the line III-III in li`ig. 2;
l~'ig, 4 is a front view showing a modiEication f~
Or -the stop-perp 11'i.~. 5 is a view in sec-tion -taken along the line V-V in 1~'ig. 4;
li'ig, 6 i5 a s.ide eleva-tion in longi-tudinal section showing a second. embodi.men-t of the inven-tion;
L'\ig. 7 is a view in section taken along the line VII VII i:n :L;`ig. 6;
~ 'ig. 8 is a view slmi.:l.ar -to -~'ig. 7 and showing a mod.if.'ication of -the second embocliment as used for d.iametrically large pipes9 and Ii'.ig. 9 ls a ~ragmen-tary pla.n view o:E the sa.me~
With reference to :~ig. 1, two pipes 1 are provided with a cement lin.ing la. One of -the pipes has a spigo-t 2, which is inser-ted into the socket 3 of the o-ther pipe for connection. An annular packil~g 4 made of rubber or the like is interposed between -the outer perlphery of the spigot 2 and a tapered -pac~ing seat 5 formed on the inner periphery of the open end of the socket 3. A press-ing ring 6 for pressing the packing 4 surrounds the spigot 2 outside the socket 3. The pressing ring 6 is fastened, at portions (e.g. six por-tions) equidistantly spaced apar-t circumferentially thereof, -to an outer flange 8 at the end of the socket 3 by fastening members 79 such as bolts, nuts, etc. The ring 6 has a pressing end 6a projecting toward the socket 3 ~or pressing the packing 4 into intimate 7~
contact wi.th -the -two pipes l. T.he -pipe jolnt thus cons-truc-ted connec-ts the spigot 2 a.nd the socket 3 toge-t.her water-tightly.
~he presslng ring 6 has on its inner periphery a -tapered surface 9 having an increasing di~meter toward the socket 3 an~ def.ining a circumf'erentially con-tinuous annul.ar recess 10 -to :~`orm a s-tepped portion between the pressing end 6a and -the other end of` the ri.ng 6. .L~`itted l.n t,he recess lO around -the outer periphery o~ the spigot 2 is a stopper 11 whioh is an integral ring divided at one por-tion as shown in ~'igs. 2 and 4. '~he stopper 11 has an outer peripheral su-rface 12 -tapered in conformi-ty with -the tapered surface 9 ancL is provided on its inner periphery wi-th a pl-ura]ity of engaging ed.ges 13 each extending in the form o~ a ridge. The engaging edge 13 extends continuously circumferentially of thestopper as seen in l~ig. 3. Alterna-tively engaging edges may be f`ormed discretly circumferentially of the s-topper ll at a specified.
spacing as shown in Fig. 5. In either case~ it is desirable -to form the engaging edges 13 in two rows at axially opposite ends of -the stopper ll to prevent the spigot from slipping of~ effec-tively. Between -the portions of the pres~ing ring 6 fastened by the fastening members 79 tap bolts 14 are screwed in and extend through the ring 6 approximately perpendicular to the tapered surface 12 of --7~
-the s-topper 11. When tigh-tened up, the -tap bol-ts 14 press -t.he stopper 11 from outside against the spigo-t 2.
rl~he ta-p bol-t 14 has a .f`orward end face parallel to the tapered s-urface 12 of the s-topper 11.
If`-the spigo-t 2 a~ts -to slip off :t'rom -the socl~et
-I;he l.ining. In -the case -where the spi~oti is to slip off, -the wedges exert ~rea,ter ~ressure on the spi~ot ou-ter peripher~. ~hus -l,he inevi.-table uneven distri.bution of nressin~ forces even-tual.ly leEId3 -to -the likellhood tha,t -the linl.n~ w~l.l separate o:F'f' ]oca:l,ly.
In vi.ew of -these problems, -the ob~ject o-f -the p-resen-t inven-t:lon i.s to provide a ~epara,-ti.on preventin~
pipe ~oi.nt wh.ich ha.s mearl.s ~rovi.ded outslde a ~ocke-t :f'or prevent-i.ng a. spi~o-t -~rom sl,ipping, o~-F the socket.and which is ea.s;y to assemble and ca,pab].e of reliabl.y preventing separa.tion without en-tai].in~ ob~ecti.ons such a.e crackin~
or separa-tion of the cement lining on the inner periphery of the spi~ot.
rrO fulfill -this obaect, the present invention provides a pipe aoint *or preventin~ separation wherein an annular packing is provided between a paclrin~ seat formed on -the inner periphery of a. socket and the outer periphery of a spigot. The pipe ~oint comprises a. holdin~
member connectable -to an annular outer flange formed at -the end of the socke-t and surroundin~ the spi~ot outer periphery ou-tside the socket, the holding member bein~
annular or bein~ adapted to form an annular sha.pe, the holdin~ member being provided on its inner periphery with a tapered surface h.avi.ng an increasing diameter toward the 30cket; a ~topper in the form of a rin~ divided at 7~
one ~or-t-lon and provided wi.-th an ou-ter peripheral tapered sur~ace having an increa.sing diameter toward the socket a.nd with en~agin.~ edge mea.ns in a plurality o~ circum~er-en-tia.l rows on its i.nner periphery, the stopper being in-terposed be-tween -the inner periphera]. tapered sur~ace o~ the ho]ding member and the spigo-t outer periphery; and tap 'bol-ts extending throu~h -the holding member at sui.table por-tions a].ong i-ts circum:ference -~or pressing the stopper ~rom outside against -the s~igo-t outer peripher.y7 each o-P
-the tap bolts having a :~orward end face parallel -to -the outer periphera]. tapered sur~ace o-~ the stopper.
According to -the construction described above, the stopper is in the ~orm o~ a ring divided a-t one portion ~i~e. having circum~erentially opposed ends), so -tha.t -the aoint is easy to assemble, while the spigot will not be sub~ec-ted to uneven pressllre even if the tap bol-ts are tigh-tened up strongly u.nl.ike -the conventional ~joint. ',rhis eliminates problems, such as separa-tion of the lining.
~urther the uni~orm engagement o~ the engaging edge means with the spigot outer periphery accomplish.ed by tightenin~
up the tap 'bolts strong],y can be ef~ec-ted more tightly by the stopper which exerts a wedging action when the spi~ot is to slip off. Within the limits o~ the strength o-~ the holding member, therefore, it is almost unlikely tha-t the spi.got wi].l separate -~rom the socket.
Accordin~ -to an embodi.men-t of -the invention, -the packlng sea-t is f'ormed on the inner periphery of' the socket end, and. the holding member is an annular pressing ring connec-ted a-t sui-table portions along it~ circumf'erence -to -the ou-ter Elange a-t 1,he socke-t end by fastening members, whereby the end. of' the p:ressing ring opposed to -the socket is pressed against the packing-According to anoth.er embodiment of`-the invention, -the pacl{ing sea.t :i.s posi-ti.oned at a dis-tance ~rom -the open encl f'ace o.~' th.e socket, and -the ho:Lding member comprises a pl~lrality of circular arc housings connected -together in -the ~'orm of' a.n annular ring by bo]..-ts and each having a hook portion engageable wi-th -the outer flange at -the socket end.
Various f'eatures and advantages of' the present invention will become apparent from the Eollowing d.escrip--tion of embodiments given wi-th ref'erence to -the accompany-i.ng drawings, in whic.h:
Fig. 1 is a side elevation in longitudinal section showing a pipe join-t according to a first embodi-ment o:E the invention;
~ig. 2 i~ a fron-t view showing a stopper;
l'ig. 3 is a view in section taken along -the line III-III in li`ig. 2;
l~'ig, 4 is a front view showing a modiEication f~
Or -the stop-perp 11'i.~. 5 is a view in sec-tion -taken along the line V-V in 1~'ig. 4;
li'ig, 6 i5 a s.ide eleva-tion in longi-tudinal section showing a second. embodi.men-t of the inven-tion;
L'\ig. 7 is a view in section taken along the line VII VII i:n :L;`ig. 6;
~ 'ig. 8 is a view slmi.:l.ar -to -~'ig. 7 and showing a mod.if.'ication of -the second embocliment as used for d.iametrically large pipes9 and Ii'.ig. 9 ls a ~ragmen-tary pla.n view o:E the sa.me~
With reference to :~ig. 1, two pipes 1 are provided with a cement lin.ing la. One of -the pipes has a spigo-t 2, which is inser-ted into the socket 3 of the o-ther pipe for connection. An annular packil~g 4 made of rubber or the like is interposed between -the outer perlphery of the spigot 2 and a tapered -pac~ing seat 5 formed on the inner periphery of the open end of the socket 3. A press-ing ring 6 for pressing the packing 4 surrounds the spigot 2 outside the socket 3. The pressing ring 6 is fastened, at portions (e.g. six por-tions) equidistantly spaced apar-t circumferentially thereof, -to an outer flange 8 at the end of the socket 3 by fastening members 79 such as bolts, nuts, etc. The ring 6 has a pressing end 6a projecting toward the socket 3 ~or pressing the packing 4 into intimate 7~
contact wi.th -the -two pipes l. T.he -pipe jolnt thus cons-truc-ted connec-ts the spigot 2 a.nd the socket 3 toge-t.her water-tightly.
~he presslng ring 6 has on its inner periphery a -tapered surface 9 having an increasing di~meter toward the socket 3 an~ def.ining a circumf'erentially con-tinuous annul.ar recess 10 -to :~`orm a s-tepped portion between the pressing end 6a and -the other end of` the ri.ng 6. .L~`itted l.n t,he recess lO around -the outer periphery o~ the spigot 2 is a stopper 11 whioh is an integral ring divided at one por-tion as shown in ~'igs. 2 and 4. '~he stopper 11 has an outer peripheral su-rface 12 -tapered in conformi-ty with -the tapered surface 9 ancL is provided on its inner periphery wi-th a pl-ura]ity of engaging ed.ges 13 each extending in the form o~ a ridge. The engaging edge 13 extends continuously circumferentially of thestopper as seen in l~ig. 3. Alterna-tively engaging edges may be f`ormed discretly circumferentially of the s-topper ll at a specified.
spacing as shown in Fig. 5. In either case~ it is desirable -to form the engaging edges 13 in two rows at axially opposite ends of -the stopper ll to prevent the spigot from slipping of~ effec-tively. Between -the portions of the pres~ing ring 6 fastened by the fastening members 79 tap bolts 14 are screwed in and extend through the ring 6 approximately perpendicular to the tapered surface 12 of --7~
-the s-topper 11. When tigh-tened up, the -tap bol-ts 14 press -t.he stopper 11 from outside against the spigo-t 2.
rl~he ta-p bol-t 14 has a .f`orward end face parallel to the tapered s-urface 12 of the s-topper 11.
If`-the spigo-t 2 a~ts -to slip off :t'rom -the socl~et
3 to whlch it is connected by -the joint of'-the above cons-truction, -the s-topper 11 pressed against the ou-ter periphery o:~ the spigot 2 i.s moved by -the actlon of the spigo-t 2 away from t.he socket 3 a1ong the forward end f'aces o O:e the -tap bolts 14 and th.e tapered inner peripheral surface o:f' the pressing ring 6. Consequently the .stopper, acting like a wedge, is f'orcibly cons-tricted diametrically, with -the result tha.t the engaging edges 13 on its inner periphery are pressed agains-t the outer periphery of the spigot 2 under increased pressure to bite into the periphery, whereby the spigo-t 2 is prevented from slipping off, It may appear that the tap bolts 14, when tightened up, will separate the tapered surface 12 of` the stopper 11 from the tapered surface 9 of` the pressing ring 6, but an effec-tive pressure can be obtained actually merel~ by causing the ends of` the bolts 14 to project sligh-tly from the tapered surface 9, so -tha-t the taperes surfaces 9 and 12 can be consid.ered to be substantially f'lush with each other.
~'urther at the locations where the tap bolts 14 are not in pressing contact with the stopper 11, contact is assured : 8 7~L~7 between -the taperes surfaces 9 and 12. Thus the stopper 11. produces a wedging effect oveY -the entire periphery thereof'.
~ specially beca-use the s-topper 11 is an lnte-gral ring which is divided at one port.ion, the pressure -to be exerted by the sto~pper 11 when the -tap bolts 14 are tightened up .is subs-tantially uniform over the entire circum~'eren-tial :Length of` the stopper, wh.ile i~ the spi.go-t acts to slip of`f as above, -the s-topper 11 is diame-trically constric-ted in i.-ts entire-ty and pressed against the spigo-t as i.f constrictlng -the spigo-t. Accordingly -the pressure and therefore the engaging action, namely s-topper action, by the biting o~` the edges 13 exer-ted on the spigot are approximately uniform over the en.-tire periphery of -the spigot. This enables the stopper 11 to prevent separa-tion very e~:fectively without the likelihood involved in the convenlional join-t -that the spigot will be subjected -to uneven pressure, ~or example, due to uneven fastening force.
I'hus -the present joint achieves an outstanding separation preventing e~fect. Additionally because the stopper 11 in -the ~orm of a divided bu-t integral ring will not exert a high pressure local.ly on the spigot 2, the cemen-t lining la is free of cracking or separation.
The stopper 11 which is a divided but integral ring has another advantage that it is easy to ins-tall and and make.
~ `igs. 6 and 7 show a second embodiment of the inven-tion~ in which. the same parts as included in the first embodiment are referred to by -the same corresponding reference numerals. Such parts wlll not be described.
As shown in ~`ig. 6, this embodiment has a pack.i.ng seat 5 positioned at a d.istance from the end face of` the socket 3 and an annular projecliion 15 for hold.:ing an annular packing 4 in position. A Ktopper ll is provided with a holding member comprising two semicircular housings 6' each having a connec-ting :f'lange 16 a-t each end and connected together in an annular f'orm by bolts 17 and nuts 18. ~he housing 6' has a hook portion 6a' which is engaged wi-th the outer flange 8 of' the socket 3, whereby the housing can be installed in place. The housing 6' is partly cut out as at 19 where the housing interferes with tap bolts 14.
When the joint is used for pipes 1 of large diame-ter, an increased number of tap bolts 14 are used as seen in ~igS 4 8 and 9. Additional bolts 17l and nuts 18' are employed for f`astening the connecting flanges 16 together tightly to prevent separation of the housings 6' when the spigot 2 acts to slip of'f.
~he second embodiment prevents separation on the same princip:Le as the first embodiment.
--10_
~'urther at the locations where the tap bolts 14 are not in pressing contact with the stopper 11, contact is assured : 8 7~L~7 between -the taperes surfaces 9 and 12. Thus the stopper 11. produces a wedging effect oveY -the entire periphery thereof'.
~ specially beca-use the s-topper 11 is an lnte-gral ring which is divided at one port.ion, the pressure -to be exerted by the sto~pper 11 when the -tap bolts 14 are tightened up .is subs-tantially uniform over the entire circum~'eren-tial :Length of` the stopper, wh.ile i~ the spi.go-t acts to slip of`f as above, -the s-topper 11 is diame-trically constric-ted in i.-ts entire-ty and pressed against the spigo-t as i.f constrictlng -the spigo-t. Accordingly -the pressure and therefore the engaging action, namely s-topper action, by the biting o~` the edges 13 exer-ted on the spigot are approximately uniform over the en.-tire periphery of -the spigot. This enables the stopper 11 to prevent separa-tion very e~:fectively without the likelihood involved in the convenlional join-t -that the spigot will be subjected -to uneven pressure, ~or example, due to uneven fastening force.
I'hus -the present joint achieves an outstanding separation preventing e~fect. Additionally because the stopper 11 in -the ~orm of a divided bu-t integral ring will not exert a high pressure local.ly on the spigot 2, the cemen-t lining la is free of cracking or separation.
The stopper 11 which is a divided but integral ring has another advantage that it is easy to ins-tall and and make.
~ `igs. 6 and 7 show a second embodiment of the inven-tion~ in which. the same parts as included in the first embodiment are referred to by -the same corresponding reference numerals. Such parts wlll not be described.
As shown in ~`ig. 6, this embodiment has a pack.i.ng seat 5 positioned at a d.istance from the end face of` the socket 3 and an annular projecliion 15 for hold.:ing an annular packing 4 in position. A Ktopper ll is provided with a holding member comprising two semicircular housings 6' each having a connec-ting :f'lange 16 a-t each end and connected together in an annular f'orm by bolts 17 and nuts 18. ~he housing 6' has a hook portion 6a' which is engaged wi-th the outer flange 8 of' the socket 3, whereby the housing can be installed in place. The housing 6' is partly cut out as at 19 where the housing interferes with tap bolts 14.
When the joint is used for pipes 1 of large diame-ter, an increased number of tap bolts 14 are used as seen in ~igS 4 8 and 9. Additional bolts 17l and nuts 18' are employed for f`astening the connecting flanges 16 together tightly to prevent separation of the housings 6' when the spigot 2 acts to slip of'f.
~he second embodiment prevents separation on the same princip:Le as the first embodiment.
--10_
Claims (8)
1. A pipe joint for preventing separation wherein an annular packing is provided between a packing seat formed on the inner periphery of a socket and the outer periphery of a spigot, the pipe joint comprising:
a plurality of circular arc housings connected together in the form of an annular ring and surrounding the spigot outer periphery outside the socket, each housing comprising a first portion having a radially inwardly extending lip at one axial end thereof and a radial web at the other axial end thereof remote from the socket end face, and a second portion extending axially from the inner end of said radial web away from the socket end face, said second portion being provided on its inner periphery with a tapered surface increasing in diameter toward the socket end;
an annular outer flange formed on the end of the socket and engageable by said radially inwardly extending lips of the housing first portions;
a stopper in the form of a ring divided at one location and interposed between the inner peripheral tapered surfaces of the housing second portions and the spigot outer periphery immediately inwardly of the radial webs of the housing first portions, said stopper being provided with engaging edge means in a plurality of circumferential rows on its inner periphery and with an outer peripheral tapered surface increasing in diameter toward the socket end and adapted to be in wedging engagement with the inner peripheral tapered surfaces of the housing second portions;
and tap bolts extending through the housing second portions for pressing the stopper from outside against the spigot outer periphery, and radial recesses formed on the surfaces of said radial webs of the housing first portions, said radial recesses being opposed to said tap bolts.
a plurality of circular arc housings connected together in the form of an annular ring and surrounding the spigot outer periphery outside the socket, each housing comprising a first portion having a radially inwardly extending lip at one axial end thereof and a radial web at the other axial end thereof remote from the socket end face, and a second portion extending axially from the inner end of said radial web away from the socket end face, said second portion being provided on its inner periphery with a tapered surface increasing in diameter toward the socket end;
an annular outer flange formed on the end of the socket and engageable by said radially inwardly extending lips of the housing first portions;
a stopper in the form of a ring divided at one location and interposed between the inner peripheral tapered surfaces of the housing second portions and the spigot outer periphery immediately inwardly of the radial webs of the housing first portions, said stopper being provided with engaging edge means in a plurality of circumferential rows on its inner periphery and with an outer peripheral tapered surface increasing in diameter toward the socket end and adapted to be in wedging engagement with the inner peripheral tapered surfaces of the housing second portions;
and tap bolts extending through the housing second portions for pressing the stopper from outside against the spigot outer periphery, and radial recesses formed on the surfaces of said radial webs of the housing first portions, said radial recesses being opposed to said tap bolts.
2. A pipe joint as defined in claim 1 wherein the engaging edge means are provided in two rows at axially opposite ends of the stopper.
3. A pipe joint as defined in claim 2 wherein each of the engaging edge means comprises an engaging edge continuously extending circumferentially of the stopper.
4. A pipe joint as defined in claim 2 wherein each of the engaging edge means comprises engaging edges formed discretely circumferentially of the stopper.
5. A pipe joint as defined in claim 1 wherein the stopper itself exerts a diametrically constricting force on the spigot outer periphery when installed in place.
6. A pipe joint as defined in claim 1 wherein the circum-ferentially opposite ends of each housing second portion are each provided with a connecting flange, and each two adjacent connecting flanges are connected together by one or more sets of bolt and nut.
7. A pipe joint as defined in claim 1 wherein each tap bolt has a forward end face parallel to and in surface-to-surface wedging engagement with the outer peripheral tapered surfaces of the stopper.
8. A pipe joint as defined in claim 1 wherein the circumferentially opposite ends of each housing first portion are cut away so that the housing first portions are circumferentially discontinuous when the housings are connected together.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3850082U JPS58140391U (en) | 1982-03-17 | 1982-03-17 | Disengagement prevention pipe fitting |
| JP57-38500 | 1982-03-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1188717A true CA1188717A (en) | 1985-06-11 |
Family
ID=12526977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000423643A Expired CA1188717A (en) | 1982-03-17 | 1983-03-15 | Pipe joint for preventing separation |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS58140391U (en) |
| CA (1) | CA1188717A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6008899B2 (en) * | 2014-06-23 | 2016-10-19 | 株式会社水道技術開発機構 | Attaching the reinforcing bracket |
| JP6917608B2 (en) * | 2016-11-04 | 2021-08-11 | 株式会社水道技術開発機構 | Pipe joint detachment prevention method and device, and socket metal fittings |
-
1982
- 1982-03-17 JP JP3850082U patent/JPS58140391U/en active Pending
-
1983
- 1983-03-15 CA CA000423643A patent/CA1188717A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58140391U (en) | 1983-09-21 |
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| MKEC | Expiry (correction) | ||
| MKEX | Expiry |