CA1122624A - Safety pipe coupling - Google Patents
Safety pipe couplingInfo
- Publication number
- CA1122624A CA1122624A CA348,020A CA348020A CA1122624A CA 1122624 A CA1122624 A CA 1122624A CA 348020 A CA348020 A CA 348020A CA 1122624 A CA1122624 A CA 1122624A
- Authority
- CA
- Canada
- Prior art keywords
- sealing ring
- pipe
- conical
- limiting edge
- diameter
- 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
Landscapes
- Gasket Seals (AREA)
- Joints With Pressure Members (AREA)
Abstract
ABSTRACT
This invention relates to a safety pipe coupling with a sealing ring for use in pipe connections. The sealing ring has an outer and inner forwardly converging conical front and two or more cutting edges on the inner surface having different diameters when the connection is completed.
The sealing ring is inserted between a connecting piece which also has an inner conical surface, and a pressure member forming a screw cap. The sealing ring - when the connection is completed - has a limiting edge behind the conical converging front and in a direction behind the cutting edges at the inner surface. The limiting edge has a front surface vertical to the surface of the pipe and the limiting edge is followed by a cylindrical inner surface.
This invention relates to a safety pipe coupling with a sealing ring for use in pipe connections. The sealing ring has an outer and inner forwardly converging conical front and two or more cutting edges on the inner surface having different diameters when the connection is completed.
The sealing ring is inserted between a connecting piece which also has an inner conical surface, and a pressure member forming a screw cap. The sealing ring - when the connection is completed - has a limiting edge behind the conical converging front and in a direction behind the cutting edges at the inner surface. The limiting edge has a front surface vertical to the surface of the pipe and the limiting edge is followed by a cylindrical inner surface.
Description
'~he present invention l~el7ltes to a safety pipe.
It is ~referabLe but not limlted that the present invcntion is appLic~ble to ;~ saf`ety pipe coup-ling in a h~1draulic pi~ing sy~tem. More speci-fically, the present invention relates to a safety pipe coupling wi-th a sealing ring for use in pipe connections, which sealing ring has an outer 73nd an inner forwardly converging conical frontpart and two or more cutting edges at the inner ~urface having differerlt diameters when the connection is complete-~, which sealing ring is inserted between a connecting piece, which has an inner conical surface, and a pressure member being made as a screw C71~. On tightening the pressure member or nut ~xially along the stationa-ry end of' the pipe the sealing ring will be moved in forward direction 73nd therewith ~orced to cllt into the wall of the pipe by its cutting edges and pushing up material of the wall.
A known sealing ring of this kind is provided with two OI` more cutting e(1ges in succession having dif'ferent diameters. 'rhe rearwardly inner surface following t~le cutting edge, which is in relation to the moving direction rearwardly po-sitioned, is provided with a conical inner surface adjoining a cylindrical inner surface of the rear-wardly part Or the se7lLing ring, which lies plasti-cally 73gainst the outer surface of the pipe when the connection is completed~ whereby no exact stop can be ~`elt by the assembler. It is conse-quently extremel~y dit`l`icuLt l`or the assembler to tighten the connection correctly and a dangerous ~?9~
strip of the screw conn~ction may occur.
It is an object of the ~recient invention to overcome these deficiencies and to provide a safety pipe coupling with a sealing rin~ main-taining the necessar,y strength factors and showing a progressive increase of` the cutting resistance when the connec-tion is corrlpleted and furthermore damping any oscillations so that a break or crack in the area Or the sealing connection by mechani-cal oscillations will be prevented.
~he present invention therel'ore provides a safety pipe coupling - as above - which is characterized by a sealing ring - when the connection is com-pleted - havirlg a limiting edge at the area behind the conical converging front~art and in rnoving direction behind the,cutting edges at the inner surfac~f?, which limiting edge having ~ frontsurf'-lce bein~ in vertical direction to the surface of the p; pl? and the limiting edge is foll~wed by a cyLindrical inner sur-f'ace.
According to the invention the limiting edge be comes effective during the last stage of assemb-iing. When the cylindrical inner surface is connected to a convex curved surface which changes its diameter so that it increases as illu.strated in the embodiment, it,- makes sure that the convex curvt?~ surl'ace wi~h its irlcreasinK diameter of the scaling ring is dlrn~)irlg~ the ~ipe surface 50ftly but str~ongly, S(J t,~l:lt, - in case of nhe i24 occurence ol mechAnica~ oscillations - a suffi-ci~n~ dlllnr)irip; o~ oscillatiorls is achieved to prevent a break or crack in tin area of the sealing connection.
The diameter Or the l~ing of the second cutting edge of the se~linr, rill~ is adv~ntageously larger than the corresponding diameter Or the first cut-ting edge. A progress,ive incre~se of the cutting resistance is effected by this feature followed by the operation ot` the limiting edge which results a steep increase of the cutting resistance. m e thickness of the sealing ring immediately behind the frontsurface of the lirniting edge is advantage-ously correspondent to the h~lf of the difference of the diameter betwe~n the largest diameter of the cone of the connecting piece and the outer diameter of the pipe. A maximum effectiveness of the limiting edge is achieved by this rule of proportioning. The inner diameter of the pressure member - being lormed as a screw cap - in the non-~hreaded area of the pressure head being larger than the outer diameter of the pipe surface, whereby the non-t;hreade(l plrt of the pressure head has a cylindrical or a f`unnel-shaped countersinking.
By this featurè according to the invention an in-clination of the pipe is possible - when the con-nection is completed - so l;o Ichicve A superior damping of oscillationci.
'rhe invention will be more readily understood from the following descrir)tiorl of An embodiment thereof given b~ w~y of evl~Mple with r(?ferenc~? to the > _ accom~anyirlg dr,~willl,s, irl ~!hi.Ch:
~`ig. 1 shows a view takerl in longitudin.ll section through an ~Ipprr half Or the pipe connection with senlin~ rin~ ,~ccordin~ ~o the invention in its initial con~ition, Fig. 2 shows a view t,~ken i.n longitudinal cection through the em~odirrlerlt ol` Fi.~r. 1 when the connection is comE,Ieted.
As shown in the drawing, the connecting piece 1 has an inner conical surface 2 to take up the sealing ring ~, which is E)ushed on the pi~e 4. The pipe end which is to be connected fits against an abutment 5 in the connecting piece ~.
~len the connection i5 assfmbled, the pressure member ~- being ma(le ~s n srrew C~p i.S tightened thereb~ abuting its front conical surface 13 against the c~nical bevel 1,~ of the sea].ing ring 3, which bevel hAs a conical angl.e ol 90, and pushing the sealirlg ring 3 in ~3 ~ial d i I`eCtiOn Or the pipe 4 to the l~ll si(3e :in tnl (Ir~w~
q'he s~aling ring ') i.s provided wi.th two ~ifferent and successively arrclnged lirst and secorld cutting edges 7 ~nd 8 ~nd in i~s ini~ l condition, shown in ~iK. 1, the first CUt~illg e(lge 7 being at the front side of the seelillg ri.ng is provided with a sru,lller inside diemetel th~n the followin~
second clltting edge ~3, So l.hat the CUttillg edge 7 is cuttin~ into the surl ace of the pip~ initially.
'l`i1ere is a def`inite rel.atioll ~e~weerl tile depth of 1~22{i24 cutting and the A:istance ~etween the two cutting edges.
The cutting edge ~ is followed by the limiting edge 11 with its front si~e vertically directed to the surface of the pipe 4. The sealing ring 3 is provided from the limi~ing edge with a surface Or cylin~rical shape ch~nging into a convex curved surface 10 at the en(l of` the sealing ring with increasing di~meter reprecenting a trumpet like exit 13.
As illustrateA in Fig. 2, the sealing ring 3 may be slightly ~eflected bec~us~ of the compression force of the pressure member anA form a small space 19, and the convex curved surface 10 does not disturb the tight contact of the sealing ring ~ against the pipe 4.
Due to the axial movement of the sealing ring 3 and the decrease of the Aiameter of the outer conical surface 2 theref`rom resulting, the cutting edge 7 is penetrating into the surface of the pipe 4 displacing some of the ~aterial 15 of the pipe.
The cutting edge '~ is f`ollowed by the cutting eAge ~ within a Ae~`inite proportion.
At his stage of assembling the limiting edge 11 causes a blocking effect between the conical inner surface of the connecting plece 1 and pipe 4, so .... . .
that no lurther axial movement of the sealing ~ing 3 can ~c achi(ve(1. At ~his con(7ition the limiting edge 11 is in the are.l of the largcst diameter 16 of the conical surface 2 causing a strong pressure on the pipe. In other words, the thickness of the sealing ring 3 immediately behind the limiting edge 11 is the half of the difference between the largest diameter and the outer diameter Or the pipe 4.
The limiting edge 11 is efrecting a resistance clearly observable to the assembler at the last stage of asse~bling, so that further tightening of the screw cap 6 is only possible by using ver~ strong power. ~le assembler therefor re-ceives an outstanding indication when the con-nection is completed. The geometrical shaping of the limiting edge 11 makes it reliable that the convex curved surface and the trumpet-like exit at the end 1~ of the sealing ring 3 remains unchanged. ~herefore the pipe 4 is damped sleeve-like softly and strongly under the action of pressure on the 90 conical bevel 12 as well as of the sealing ring 3 and the screw cap 6.
The non-threaded area 20 positioned at rear portion of the pressure member 20 has a funnel-shape (solid linc) or cylindrical (broken line) countersinking which has a larger diameter of that of the pipe 4 as illustrated in Figs. 1 and 2.
The pipe surface 4 can be inclined as shown by the angle 1r~ in Fig. 2. ~y this reason mechanical _ 9 _ ~l;2ZG2~
oscillatic)ns can be (~amped in this way and a brenk of` the eonrlection is avoided in the area o~^ the sealing ring.
1~
, .
It is ~referabLe but not limlted that the present invcntion is appLic~ble to ;~ saf`ety pipe coup-ling in a h~1draulic pi~ing sy~tem. More speci-fically, the present invention relates to a safety pipe coupling wi-th a sealing ring for use in pipe connections, which sealing ring has an outer 73nd an inner forwardly converging conical frontpart and two or more cutting edges at the inner ~urface having differerlt diameters when the connection is complete-~, which sealing ring is inserted between a connecting piece, which has an inner conical surface, and a pressure member being made as a screw C71~. On tightening the pressure member or nut ~xially along the stationa-ry end of' the pipe the sealing ring will be moved in forward direction 73nd therewith ~orced to cllt into the wall of the pipe by its cutting edges and pushing up material of the wall.
A known sealing ring of this kind is provided with two OI` more cutting e(1ges in succession having dif'ferent diameters. 'rhe rearwardly inner surface following t~le cutting edge, which is in relation to the moving direction rearwardly po-sitioned, is provided with a conical inner surface adjoining a cylindrical inner surface of the rear-wardly part Or the se7lLing ring, which lies plasti-cally 73gainst the outer surface of the pipe when the connection is completed~ whereby no exact stop can be ~`elt by the assembler. It is conse-quently extremel~y dit`l`icuLt l`or the assembler to tighten the connection correctly and a dangerous ~?9~
strip of the screw conn~ction may occur.
It is an object of the ~recient invention to overcome these deficiencies and to provide a safety pipe coupling with a sealing rin~ main-taining the necessar,y strength factors and showing a progressive increase of` the cutting resistance when the connec-tion is corrlpleted and furthermore damping any oscillations so that a break or crack in the area Or the sealing connection by mechani-cal oscillations will be prevented.
~he present invention therel'ore provides a safety pipe coupling - as above - which is characterized by a sealing ring - when the connection is com-pleted - havirlg a limiting edge at the area behind the conical converging front~art and in rnoving direction behind the,cutting edges at the inner surfac~f?, which limiting edge having ~ frontsurf'-lce bein~ in vertical direction to the surface of the p; pl? and the limiting edge is foll~wed by a cyLindrical inner sur-f'ace.
According to the invention the limiting edge be comes effective during the last stage of assemb-iing. When the cylindrical inner surface is connected to a convex curved surface which changes its diameter so that it increases as illu.strated in the embodiment, it,- makes sure that the convex curvt?~ surl'ace wi~h its irlcreasinK diameter of the scaling ring is dlrn~)irlg~ the ~ipe surface 50ftly but str~ongly, S(J t,~l:lt, - in case of nhe i24 occurence ol mechAnica~ oscillations - a suffi-ci~n~ dlllnr)irip; o~ oscillatiorls is achieved to prevent a break or crack in tin area of the sealing connection.
The diameter Or the l~ing of the second cutting edge of the se~linr, rill~ is adv~ntageously larger than the corresponding diameter Or the first cut-ting edge. A progress,ive incre~se of the cutting resistance is effected by this feature followed by the operation ot` the limiting edge which results a steep increase of the cutting resistance. m e thickness of the sealing ring immediately behind the frontsurface of the lirniting edge is advantage-ously correspondent to the h~lf of the difference of the diameter betwe~n the largest diameter of the cone of the connecting piece and the outer diameter of the pipe. A maximum effectiveness of the limiting edge is achieved by this rule of proportioning. The inner diameter of the pressure member - being lormed as a screw cap - in the non-~hreaded area of the pressure head being larger than the outer diameter of the pipe surface, whereby the non-t;hreade(l plrt of the pressure head has a cylindrical or a f`unnel-shaped countersinking.
By this featurè according to the invention an in-clination of the pipe is possible - when the con-nection is completed - so l;o Ichicve A superior damping of oscillationci.
'rhe invention will be more readily understood from the following descrir)tiorl of An embodiment thereof given b~ w~y of evl~Mple with r(?ferenc~? to the > _ accom~anyirlg dr,~willl,s, irl ~!hi.Ch:
~`ig. 1 shows a view takerl in longitudin.ll section through an ~Ipprr half Or the pipe connection with senlin~ rin~ ,~ccordin~ ~o the invention in its initial con~ition, Fig. 2 shows a view t,~ken i.n longitudinal cection through the em~odirrlerlt ol` Fi.~r. 1 when the connection is comE,Ieted.
As shown in the drawing, the connecting piece 1 has an inner conical surface 2 to take up the sealing ring ~, which is E)ushed on the pi~e 4. The pipe end which is to be connected fits against an abutment 5 in the connecting piece ~.
~len the connection i5 assfmbled, the pressure member ~- being ma(le ~s n srrew C~p i.S tightened thereb~ abuting its front conical surface 13 against the c~nical bevel 1,~ of the sea].ing ring 3, which bevel hAs a conical angl.e ol 90, and pushing the sealirlg ring 3 in ~3 ~ial d i I`eCtiOn Or the pipe 4 to the l~ll si(3e :in tnl (Ir~w~
q'he s~aling ring ') i.s provided wi.th two ~ifferent and successively arrclnged lirst and secorld cutting edges 7 ~nd 8 ~nd in i~s ini~ l condition, shown in ~iK. 1, the first CUt~illg e(lge 7 being at the front side of the seelillg ri.ng is provided with a sru,lller inside diemetel th~n the followin~
second clltting edge ~3, So l.hat the CUttillg edge 7 is cuttin~ into the surl ace of the pip~ initially.
'l`i1ere is a def`inite rel.atioll ~e~weerl tile depth of 1~22{i24 cutting and the A:istance ~etween the two cutting edges.
The cutting edge ~ is followed by the limiting edge 11 with its front si~e vertically directed to the surface of the pipe 4. The sealing ring 3 is provided from the limi~ing edge with a surface Or cylin~rical shape ch~nging into a convex curved surface 10 at the en(l of` the sealing ring with increasing di~meter reprecenting a trumpet like exit 13.
As illustrateA in Fig. 2, the sealing ring 3 may be slightly ~eflected bec~us~ of the compression force of the pressure member anA form a small space 19, and the convex curved surface 10 does not disturb the tight contact of the sealing ring ~ against the pipe 4.
Due to the axial movement of the sealing ring 3 and the decrease of the Aiameter of the outer conical surface 2 theref`rom resulting, the cutting edge 7 is penetrating into the surface of the pipe 4 displacing some of the ~aterial 15 of the pipe.
The cutting edge '~ is f`ollowed by the cutting eAge ~ within a Ae~`inite proportion.
At his stage of assembling the limiting edge 11 causes a blocking effect between the conical inner surface of the connecting plece 1 and pipe 4, so .... . .
that no lurther axial movement of the sealing ~ing 3 can ~c achi(ve(1. At ~his con(7ition the limiting edge 11 is in the are.l of the largcst diameter 16 of the conical surface 2 causing a strong pressure on the pipe. In other words, the thickness of the sealing ring 3 immediately behind the limiting edge 11 is the half of the difference between the largest diameter and the outer diameter Or the pipe 4.
The limiting edge 11 is efrecting a resistance clearly observable to the assembler at the last stage of asse~bling, so that further tightening of the screw cap 6 is only possible by using ver~ strong power. ~le assembler therefor re-ceives an outstanding indication when the con-nection is completed. The geometrical shaping of the limiting edge 11 makes it reliable that the convex curved surface and the trumpet-like exit at the end 1~ of the sealing ring 3 remains unchanged. ~herefore the pipe 4 is damped sleeve-like softly and strongly under the action of pressure on the 90 conical bevel 12 as well as of the sealing ring 3 and the screw cap 6.
The non-threaded area 20 positioned at rear portion of the pressure member 20 has a funnel-shape (solid linc) or cylindrical (broken line) countersinking which has a larger diameter of that of the pipe 4 as illustrated in Figs. 1 and 2.
The pipe surface 4 can be inclined as shown by the angle 1r~ in Fig. 2. ~y this reason mechanical _ 9 _ ~l;2ZG2~
oscillatic)ns can be (~amped in this way and a brenk of` the eonrlection is avoided in the area o~^ the sealing ring.
1~
, .
Claims (5)
1. Safety pipe coupling with a sealing ring for use in connecting pipe, said sealing ring having a forwardly converging conical front part with an inner and an outer surface, said inner surface having at least two annular cutting edges of different diameters when in use, said sealing ring being inserted between a connecting piece having an inner conical surface followed by a cylindrical surface and an abutment which is contacted by the end of the pipe, and a pressure member, said pressure member forming a screw cap, said sealing ring having a limiting edge on its inner surface, behind the said conical front part, and a cylindrical inner surface behind the said limiting edge, said limiting edge being at a substantially right angle to the said cylindrical inner surface.
2. Safety pipe coupling as claimed in Claim 1, wherein the diameter of the second cutting edge of the sealing ring is larger than the corresponding diameter of the first cutting edge.
3. Safety pipe coupling as claimed in Claim 1 wherein the thickness of the sealing ring immediately behind the limiting edge is substantially half of the difference between the largest diameter of the said conical inner surface of the connecting piece and the outer diameter of the pipe connected by the coupling.
4. Safety pipe coupling with a sealing ring for connecting pipe, said sealing ring having a forwardly converging conical front part with an inner and an outer surface, said inner surface having at least two annular cutting edges of different diameters when in use, said sealing ring being inserted between a connecting piece having an inner conical surface, and a pressure member, said pressure member formed as a screw cap and having an inner diameter in its non-threaded area larger than the outer diameter of the pipe to be connected, said pressure member having in its non-threaded area a cylindrical or funnel-shaped counter sinking, said sealing ring having a limited edge on its inner surface behind the said conical frontpart, and a cylindrical inner surface behind the said limiting edge, said limiting edge being at a substantially right angle to the said cylindrical inner surface.
5. Safety pipe coupling as claimed in Claim 4, wherein the said cylindrical inner surface of the said sealing ring is followed by a convexly curved surface having a diameter which changes increas-ingly at the position opposite to the limiting edge.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54-139978(139978/79 | 1979-10-31 | ||
| JP13997879A JPS5666586A (en) | 1979-10-31 | 1979-10-31 | Safety pipe joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1122624A true CA1122624A (en) | 1982-04-27 |
Family
ID=15258090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA348,020A Expired CA1122624A (en) | 1979-10-31 | 1980-03-20 | Safety pipe coupling |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS5666586A (en) |
| AR (1) | AR219444A1 (en) |
| AU (1) | AU538412B2 (en) |
| CA (1) | CA1122624A (en) |
| DE (1) | DE8001814U1 (en) |
| ES (1) | ES249442Y (en) |
| MX (1) | MX149936A (en) |
| PT (1) | PT70920A (en) |
| YU (1) | YU42327B (en) |
| ZA (1) | ZA801768B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5553900A (en) * | 1991-01-24 | 1996-09-10 | Nippon Pillar Packing Co., Ltd. | Pipe joint structure for fluid device |
| CN103807526A (en) * | 2012-11-13 | 2014-05-21 | 南车青岛四方机车车辆股份有限公司 | Clamping sleeve type metal sealing pipe joint and using method thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4042728B4 (en) * | 1990-08-16 | 2004-09-09 | Voss Automotive Gmbh | Pipe connection with externally threaded basic piece - has clamping nut with flanged ring, and conical clamping ring |
| DE202004000565U1 (en) * | 2004-01-15 | 2005-01-27 | Keller AG für Druckmeßtechnik | Manometer, especially a digital manometer, has a pipe connection piece that is threaded only in an area that extends just beyond the manometer housing and on which a nut is tightened to hold the connection in a sealed manner |
| US10215315B2 (en) | 2008-09-05 | 2019-02-26 | Parker-Hannifin Corporation | Tube compression fitting and flared fitting used with connection body and method of making same |
-
1979
- 1979-10-31 JP JP13997879A patent/JPS5666586A/en active Pending
-
1980
- 1980-01-24 DE DE19808001814U patent/DE8001814U1/en not_active Expired
- 1980-02-26 YU YU520/80A patent/YU42327B/en unknown
- 1980-02-26 AU AU55903/80A patent/AU538412B2/en not_active Expired
- 1980-03-07 PT PT70920A patent/PT70920A/en not_active IP Right Cessation
- 1980-03-18 ES ES1980249442U patent/ES249442Y/en not_active Expired
- 1980-03-20 CA CA348,020A patent/CA1122624A/en not_active Expired
- 1980-03-21 AR AR280394A patent/AR219444A1/en active
- 1980-03-25 ZA ZA00801768A patent/ZA801768B/en unknown
- 1980-04-01 MX MX181822A patent/MX149936A/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5553900A (en) * | 1991-01-24 | 1996-09-10 | Nippon Pillar Packing Co., Ltd. | Pipe joint structure for fluid device |
| CN103807526A (en) * | 2012-11-13 | 2014-05-21 | 南车青岛四方机车车辆股份有限公司 | Clamping sleeve type metal sealing pipe joint and using method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| AR219444A1 (en) | 1980-08-15 |
| JPS5666586A (en) | 1981-06-05 |
| ES249442Y (en) | 1982-06-16 |
| ZA801768B (en) | 1981-07-29 |
| YU52080A (en) | 1983-02-28 |
| AU5590380A (en) | 1981-05-07 |
| YU42327B (en) | 1988-08-31 |
| PT70920A (en) | 1980-04-01 |
| ES249442U (en) | 1980-09-01 |
| MX149936A (en) | 1984-02-09 |
| DE8001814U1 (en) | 1980-05-22 |
| AU538412B2 (en) | 1984-08-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |