CA1094126A - Instant fittings for reinforced multilayer flexible tubings for fluids - Google Patents
Instant fittings for reinforced multilayer flexible tubings for fluidsInfo
- Publication number
- CA1094126A CA1094126A CA298,433A CA298433A CA1094126A CA 1094126 A CA1094126 A CA 1094126A CA 298433 A CA298433 A CA 298433A CA 1094126 A CA1094126 A CA 1094126A
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- CA
- Canada
- Prior art keywords
- fitting
- tubing
- ring
- bush
- conical portion
- 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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Abstract
ABSTRACT OF THE DISCLOSURE
Instant fittings for reinforced multilayer flexible tubings for fluids, comprising a body internally provided with a cylindrical inlet whose diameter is substantially equal to that of the tubing, a bead extending radially inwardly and constituting a gripping ridge followed by a generally conical part, a bore whose diameter is equal to the large diameter of the cone, said conical part being internally provided with a channelled bush on which is engaged the end of the tubing 8. The invention is applied to the connection of multilayer pipes.
Instant fittings for reinforced multilayer flexible tubings for fluids, comprising a body internally provided with a cylindrical inlet whose diameter is substantially equal to that of the tubing, a bead extending radially inwardly and constituting a gripping ridge followed by a generally conical part, a bore whose diameter is equal to the large diameter of the cone, said conical part being internally provided with a channelled bush on which is engaged the end of the tubing 8. The invention is applied to the connection of multilayer pipes.
Description
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BACKGROIJND OF TEIE INVENTION
_ The present invention relates to improvements in instant fittings for reinforced, multilayer flexible tubings for fluids.
SUMM~RY OF THE PRIOR ART
_ The fittings according to the present invention are adapted to be used with flexible pipes of the type reinforced by a braided sheath and comprising at least three layers, viz. an inner tube, a braided sheath and a protective wearing layer.
The purpose of these fittings is to effect the virtually instantaneous connection of this type of tubing, with a view to making considerable savings in manpower and to enable such fittings to be made by personnel having no special qualification therefor.
The connection of a reinforced multilayer flexible tubing is presently complicated and often requires bulky equipment, particularly for crimping and in any case the operation is always long, fairly delicate and expensive, and requires specialised and experienced manpower.
Fixing devices are known using a screw, in which the inner part of the tubing is mounted on a bush and the outer layer is strongly compressed under the effect of a tightening due to one of the following effects:
- Effect of radial compression, by crimping, by collar, shells or compressed split rings;
- Effect of compression obtained by annular rolling of axial type with formation of a retaining bead;
- Effect of radial compression made by the extension by forcing of the inner diameter of the tubing under the effect of screwing the inner bush;
- Effect of axial annular compression on local swell of the tubing due to a reinforcement of the central bush, by screwing or unscrewing a nut.
It is also known to use devices for direct crimping
BACKGROIJND OF TEIE INVENTION
_ The present invention relates to improvements in instant fittings for reinforced, multilayer flexible tubings for fluids.
SUMM~RY OF THE PRIOR ART
_ The fittings according to the present invention are adapted to be used with flexible pipes of the type reinforced by a braided sheath and comprising at least three layers, viz. an inner tube, a braided sheath and a protective wearing layer.
The purpose of these fittings is to effect the virtually instantaneous connection of this type of tubing, with a view to making considerable savings in manpower and to enable such fittings to be made by personnel having no special qualification therefor.
The connection of a reinforced multilayer flexible tubing is presently complicated and often requires bulky equipment, particularly for crimping and in any case the operation is always long, fairly delicate and expensive, and requires specialised and experienced manpower.
Fixing devices are known using a screw, in which the inner part of the tubing is mounted on a bush and the outer layer is strongly compressed under the effect of a tightening due to one of the following effects:
- Effect of radial compression, by crimping, by collar, shells or compressed split rings;
- Effect of compression obtained by annular rolling of axial type with formation of a retaining bead;
- Effect of radial compression made by the extension by forcing of the inner diameter of the tubing under the effect of screwing the inner bush;
- Effect of axial annular compression on local swell of the tubing due to a reinforcement of the central bush, by screwing or unscrewing a nut.
It is also known to use devices for direct crimping
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on the outer wall of the body or indirect crimping of members which are integral with the body.
Devices are also ~nown in which addi-tional members such as annular rings, incorporated with the locking and screwing members enable the screw tightening members to be rotated withou-t the members holding the flexible being able to rotate at the same time.
In certain known devices, the bush supporting the inner wall of the flexible is separated from the body, is detachable, possibly ro-tatable and sometimes comprises an annular seal between said bush and the body of the fitting.
It is also known to use devices allowing the instant fit-ting of a tubing simply by coupling said latter in the fitting.
These are generally fittings with self-locking means in which a cone cooperates with annular parts self-locking on said cone, constituted by clips or split rings and having teeth for catching on the inner diameter, internally -fluted or threaded segments or retaining rings or balls.
Other self-locking devices with radial tightening are also known. However, almost all these self-locking devices with instant fitting are provided for a homogeneous tubing of precise or calibrated dimensions and are not suitable for a multilayer flexible tubing.
In fact, the instant fittings are generally subjected to the pressure at the end of the tubing and their seal is obtained on the outer diameter of the tubing. Therefore, they cannot be suitable for a reinforced multilayer flexible tubing which always requires that the seal be made on the innex diameter and never on the end of the tubing. In fact, if the pressurised fluid arrives at the end of a multilayer flexible tubing, said fluid flows along the wires of the reinforcing braided sheath which is never perfectly embedded and incorporated in the layers o plastomer or elastomer, and causes the outer wearing layer of low resistance to burst at low pressure, rendering the tubing ., : : . . . ..
. . . . .. . .
unaesthetic, dangerous and inaccep-table to the user.
~ mong instant fittings, two devices are known for which the seal is made on the inner diameter of the tubing and which would consequently be suitable for multilayer flexible tubings;
however, in reality, these two devices have been studied to re-place and compete against the instant fittings mentioned above.
They are therefore made for assembly on a semi-rigid, semi-supple or supple tube of fairly good calibration and are not suited for multilayer flexible tubings. In particular, the parts supporting the tightening ef~o~ are~not sufficient to withstand the considerable forces transmitted by the pressurised fluld and the forces of traction.
It is an object of the present invention to remedy the above-mentioned drawbacks by providing an improved fitting intended for reinorced multilayer flexible tubings.
SUMMARY OF THE INVENTION
-In accordance with the present invention, the fitting comprises a body internally provided with a cylindrical inlet whose diameter is substantially equal to that of the tubing, means for ~0 compressing the tubing within the fitting adjacent the cylindrical inlet, said compressing means being followed by a generally conical portion, increasing in diameter from the compressing means into the fitting, said body having a bore adjacent the large diameter end of the conical portion and corresponding in diameter thereto, said conical portion internally receiving a rotatable bush with external gripping teeth on which an end of the tubing can be engaged, said bush having a cylindrical extension engaged in a bore of the body, said bush having an external groove in which an annular seal is disposed, said bush being axially movable to a position locked aga.inst rotation when the tubing is pushed into the fitting,and the tubing being gripped between the rotatable toothed bush and the conical portion of the body when the tubing and fitting are under tension.
The fitting according to the invention enables long, meticulous and expensive assembly operations requiring specialised manpower, to be avoided.
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According to a novel feature of the invention, the fitting allows a virtually instant fi~ting of the multilayer flexible tubings.
Furthermore, the considerable importance of flexibles for fluids under pressure and the increasing part played by servo-controls by means of fluids is realised in industry, this resulting in any improvement in the costs of establishing the fittings of multilayer flexibles rendering the use thereof easier and more current.
The device according to the invention comprises an assembly of members constituting the fitting ready for use and it has an axial cylindrical bore substantially equal to the outer diameter of the flexible tubing.
According to a feature of the invention, a bare flexible tubing is used, without any preparation other than its cut to length, to the exclusion of any other preparation such as removal of the braid, etc Fitting consists simply in forcibly pushing the previously lubricated tubing withrecip ~cating and rotating movements (thrust 20 with alternate sectorial rotations of 90 to 180) to the end of the fitting. Locking in permanent position of functioning is then effected, either by pulling on the tubing (thus enabling its correct holding to be checked) or by placing it under a sufficient pressure for this locking to be effected automatically.
The fitting presents a self-holding of the tublng and a permanent self-seal due to the pressure itself, and preventing any leakage by creeping or loss of tightening of the tubing in time or as a function of the influences of hot or cold thermal cycles.
The fitting made according to the inventlon ensures the rota-tion of the tubing in the fitting, thus avoiding the kinking thereof and enabling the fitting and its tubing to be unscrewed or re-screwed on any apparatus.
The device according to the invention may be made either in the form of independent fittings, or in the form of a complete accessory _ 5 _ , ,;
.
screwing on the majority of standard fittings available on the market, (with cuttlng ring, compression, collet, flat face, etc...) and tranforming said fittings into instant connecting members for multilayer flexible tubing or in the form oE an inexpensive, standardised, cylindrical part forming a cartridge, said part being able to be fitted by crimping or screwed and crimped or simply screwed in a very simple, inexpensive body or directly screwed in an apparatus, either in the form of a fitting terminated by a tubular part of internal dimensions equal to those of the tubing and entering directly in one of the conventional known fittings, or in the form of a fitting terminating in a part having forms complementary of a known instant fitting~
The device according to the invention employs a method o checking the correct assembly of the tubing. Different marks printed on the tubing itself allow said tubing to be cut at the suitable spot and the correct length of fit thereof in the fitting to be checked as well as the locking stroke, in order to check the assembly without any loss of time.
Two symmetrical markings are made on the tubing~ one on one side for the fit at one of the ends of the tubing and the other on the opposite side for the fit at the other end.
The tubing undergoes reversed stresses of tightening and extension, offset axially during the assembly of the tubing, but these stresses are then combined at one spot by axial displacement of the tubing and the bush to the outside of the tubing up to a permanent position of locking. The axial displacement effects at first a proyressive annular radial compression, with wedge effect, of the tubing between the bush and the rotary ring; after a calculated axial stroke, there is then produced a permanent locking due to the limit of compressibility of the tubing and also if need be by means of catching teeth on a ring locking the tubing after a predetermined axial stroke and compression of the tubing. The -compression and locking of the tubing are maintained under con-straint by the pressurised fluid which permanently pushes the bush.
BRIEF DESCF~IPTIt)N OF THE DRAWINGS
Fig. 1 ls a view in longitudinal section of an embodiment of an im~roved fitting according to the invention, in which the upper half view represents the fitting during assembly of the tubing and the lower half view in locked position;
Fig, 2 is a view in longitudinal section of anothex embodi-ment of the fitting shown in Fig~ l;
Fig. 3 is a half-view in longitudinal section of another embodiment of the fitting in position of assembly of the tubing;
Fig. 4 is a half-view in section of another embodiment in locked position of the tubing;
Fig. 5 is a view in longitudinal section of a fitting screwed on a support member;
Fig. 6 is a half-view in longitudinal section of another embodiment of a fitting when the tubing is assembled;
Fig, 7 is a half~view in longitudinal section of another embodiment of a fitting in locked position;
Fig. 8 is a half-view in longitudinal section of another embodiment of a fitting made of sheet metal in fitted position of the tubing;
Fig. 9 is a half-view of another embodiment of the fitting with a body in one piece and in locked position;
Fig, 10 is a view of the marking on one of the faces of the tubing;
Fig. 11 is a view of the presentation of the tubing for assembly in the fitting;
Fig, 12 is a view of the fit of the tubing in the fitting;
Fig, 13 is a view of the tubing locked in the fitting;
Fig, 14 is a half-view in longitudinal section of an embodi-ment of a fitting in assembled position;
Fig. 15 is a half-view in section of the same fitting as Fig. 14 in locked position;
Fig, 16 is a half-view in section of another embodiment of the fitting in assembled position;
Fig. 17 is a view in section of the same fitting as Fig. 16 in locked position.
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DESCRIPTION OF THE PREFERRED EMBODIMENTS
_ Referring now to the d~awings, ~ig. 1 shows a fitting which comprises a body 1 having a threaded part 23 on which is screwed a nut 7 which is in abutment against a shoulder ld of the body in order to constitute a housing having an inlet bore 7c for a multilayer flexible tubing ~ constituted by at least three layers, viz. a plastics tube 8c, a braided sheath 8b and a wearing layer 8a. A~ter the bore 7c there is provided a cylindrical housing 7a in which is mounted, in free rotation, a ring 6 which is axially held prisoner between the shoulder ld of the body and a shoulder 7b of the nut.
The rotary ring 6 presents, near the bore 7c, a gripping ridge 6b extending radially inwardly, followed by a generally conical part 6a. A ter the ring 6, the body has a bore 22 of diameter equal to the large diameter of the cone 6a and a tapped part lc in which is screwed a ring 4 crimped at lh and presenting a housing 4a in the form of a hollow hexagon. ~he ring 4 pre-sents a shoulder against which abuts an O-ring 3 which is held on the opposite side by a ring 2 subjected to the action of a spring r in abutment against the end of a bore lb provided in the body. Inside the fitting thus defined, there is moun-ted to slide and rotate a bush 5 having a tubular ~errule 5c guided in a bore lf of the body, in the rings 2 and 4 and by the O-ring 3 forming seal and cooperating with a shallow groove 5d, said bush comprising in its median part a boss 5b in the form of a hexagon adapted to engage in the hexagonal housing 4a to ensure the locking of the bush 5 in rotatlon.
At the end opposite the tubular ferrule, the bush 5 has a toothed ferrule having at least two teeth 5a on which is engaged the end of the tubing 8. The bush 5 is immobilised in translation by the annular O-ring 3 engaged in the groove 5d of the bush and in rotation by the hexagonal boss 5b adapted to be engaged in the corresponding housing 4a of the ring 4.
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The fitting according to the invention is used as follows:
The user having lubricated the end of ~he tubing 8 on the inside and outside, introduces said tubing into the bore 7c ~top half-view of Fig. l) and pushes it against the gripping ridge 6b of the ring 6 so that the tube is compressed slightly to occupy the position 8d and then it takes its normal diameter again to be engaged on the toothed ferrule of the bush 5 and surmount the gripping teeth 5a where it remains seized until the tubing 8 abuts at the end of the fitting on boss 5b of the bush. The fitting on the bush is obtained by alternately pushing and turning the tubing through 90 and 180. During fitting, the bush 5 is immobilised in rotation and in translation due to the engagement of the hex-agonal boss 5b in the corresponding housing 4a integral with the body.
The fitting is then locked, thls being obtained by pulling on the tubing either manually or by a sufficient pressure of fluid axerted on the socket 5 which acts as a piston with the 0-ring 3.
This results in an axial displac~ment of the bush 5 which comes into the position shown in the bottom half-view of Fig 1.
The swollen part 8e of the tubing progressively bears on the cone 6a of the ring 6 and the tubing undergoes a gradually stronger radial, annular compression with wedge effect, since it is gripped between the bush 5 and the rotary ring 6.
When the limit of compressibility of the tubing is reached, the axial stroke stops in a position shown in the bottom half-view of Fig. 1.
The pressurised fluid acting on the bush 5 and the 0-ring
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on the outer wall of the body or indirect crimping of members which are integral with the body.
Devices are also ~nown in which addi-tional members such as annular rings, incorporated with the locking and screwing members enable the screw tightening members to be rotated withou-t the members holding the flexible being able to rotate at the same time.
In certain known devices, the bush supporting the inner wall of the flexible is separated from the body, is detachable, possibly ro-tatable and sometimes comprises an annular seal between said bush and the body of the fitting.
It is also known to use devices allowing the instant fit-ting of a tubing simply by coupling said latter in the fitting.
These are generally fittings with self-locking means in which a cone cooperates with annular parts self-locking on said cone, constituted by clips or split rings and having teeth for catching on the inner diameter, internally -fluted or threaded segments or retaining rings or balls.
Other self-locking devices with radial tightening are also known. However, almost all these self-locking devices with instant fitting are provided for a homogeneous tubing of precise or calibrated dimensions and are not suitable for a multilayer flexible tubing.
In fact, the instant fittings are generally subjected to the pressure at the end of the tubing and their seal is obtained on the outer diameter of the tubing. Therefore, they cannot be suitable for a reinforced multilayer flexible tubing which always requires that the seal be made on the innex diameter and never on the end of the tubing. In fact, if the pressurised fluid arrives at the end of a multilayer flexible tubing, said fluid flows along the wires of the reinforcing braided sheath which is never perfectly embedded and incorporated in the layers o plastomer or elastomer, and causes the outer wearing layer of low resistance to burst at low pressure, rendering the tubing ., : : . . . ..
. . . . .. . .
unaesthetic, dangerous and inaccep-table to the user.
~ mong instant fittings, two devices are known for which the seal is made on the inner diameter of the tubing and which would consequently be suitable for multilayer flexible tubings;
however, in reality, these two devices have been studied to re-place and compete against the instant fittings mentioned above.
They are therefore made for assembly on a semi-rigid, semi-supple or supple tube of fairly good calibration and are not suited for multilayer flexible tubings. In particular, the parts supporting the tightening ef~o~ are~not sufficient to withstand the considerable forces transmitted by the pressurised fluld and the forces of traction.
It is an object of the present invention to remedy the above-mentioned drawbacks by providing an improved fitting intended for reinorced multilayer flexible tubings.
SUMMARY OF THE INVENTION
-In accordance with the present invention, the fitting comprises a body internally provided with a cylindrical inlet whose diameter is substantially equal to that of the tubing, means for ~0 compressing the tubing within the fitting adjacent the cylindrical inlet, said compressing means being followed by a generally conical portion, increasing in diameter from the compressing means into the fitting, said body having a bore adjacent the large diameter end of the conical portion and corresponding in diameter thereto, said conical portion internally receiving a rotatable bush with external gripping teeth on which an end of the tubing can be engaged, said bush having a cylindrical extension engaged in a bore of the body, said bush having an external groove in which an annular seal is disposed, said bush being axially movable to a position locked aga.inst rotation when the tubing is pushed into the fitting,and the tubing being gripped between the rotatable toothed bush and the conical portion of the body when the tubing and fitting are under tension.
The fitting according to the invention enables long, meticulous and expensive assembly operations requiring specialised manpower, to be avoided.
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According to a novel feature of the invention, the fitting allows a virtually instant fi~ting of the multilayer flexible tubings.
Furthermore, the considerable importance of flexibles for fluids under pressure and the increasing part played by servo-controls by means of fluids is realised in industry, this resulting in any improvement in the costs of establishing the fittings of multilayer flexibles rendering the use thereof easier and more current.
The device according to the invention comprises an assembly of members constituting the fitting ready for use and it has an axial cylindrical bore substantially equal to the outer diameter of the flexible tubing.
According to a feature of the invention, a bare flexible tubing is used, without any preparation other than its cut to length, to the exclusion of any other preparation such as removal of the braid, etc Fitting consists simply in forcibly pushing the previously lubricated tubing withrecip ~cating and rotating movements (thrust 20 with alternate sectorial rotations of 90 to 180) to the end of the fitting. Locking in permanent position of functioning is then effected, either by pulling on the tubing (thus enabling its correct holding to be checked) or by placing it under a sufficient pressure for this locking to be effected automatically.
The fitting presents a self-holding of the tublng and a permanent self-seal due to the pressure itself, and preventing any leakage by creeping or loss of tightening of the tubing in time or as a function of the influences of hot or cold thermal cycles.
The fitting made according to the inventlon ensures the rota-tion of the tubing in the fitting, thus avoiding the kinking thereof and enabling the fitting and its tubing to be unscrewed or re-screwed on any apparatus.
The device according to the invention may be made either in the form of independent fittings, or in the form of a complete accessory _ 5 _ , ,;
.
screwing on the majority of standard fittings available on the market, (with cuttlng ring, compression, collet, flat face, etc...) and tranforming said fittings into instant connecting members for multilayer flexible tubing or in the form oE an inexpensive, standardised, cylindrical part forming a cartridge, said part being able to be fitted by crimping or screwed and crimped or simply screwed in a very simple, inexpensive body or directly screwed in an apparatus, either in the form of a fitting terminated by a tubular part of internal dimensions equal to those of the tubing and entering directly in one of the conventional known fittings, or in the form of a fitting terminating in a part having forms complementary of a known instant fitting~
The device according to the invention employs a method o checking the correct assembly of the tubing. Different marks printed on the tubing itself allow said tubing to be cut at the suitable spot and the correct length of fit thereof in the fitting to be checked as well as the locking stroke, in order to check the assembly without any loss of time.
Two symmetrical markings are made on the tubing~ one on one side for the fit at one of the ends of the tubing and the other on the opposite side for the fit at the other end.
The tubing undergoes reversed stresses of tightening and extension, offset axially during the assembly of the tubing, but these stresses are then combined at one spot by axial displacement of the tubing and the bush to the outside of the tubing up to a permanent position of locking. The axial displacement effects at first a proyressive annular radial compression, with wedge effect, of the tubing between the bush and the rotary ring; after a calculated axial stroke, there is then produced a permanent locking due to the limit of compressibility of the tubing and also if need be by means of catching teeth on a ring locking the tubing after a predetermined axial stroke and compression of the tubing. The -compression and locking of the tubing are maintained under con-straint by the pressurised fluid which permanently pushes the bush.
BRIEF DESCF~IPTIt)N OF THE DRAWINGS
Fig. 1 ls a view in longitudinal section of an embodiment of an im~roved fitting according to the invention, in which the upper half view represents the fitting during assembly of the tubing and the lower half view in locked position;
Fig, 2 is a view in longitudinal section of anothex embodi-ment of the fitting shown in Fig~ l;
Fig. 3 is a half-view in longitudinal section of another embodiment of the fitting in position of assembly of the tubing;
Fig. 4 is a half-view in section of another embodiment in locked position of the tubing;
Fig. 5 is a view in longitudinal section of a fitting screwed on a support member;
Fig. 6 is a half-view in longitudinal section of another embodiment of a fitting when the tubing is assembled;
Fig, 7 is a half~view in longitudinal section of another embodiment of a fitting in locked position;
Fig. 8 is a half-view in longitudinal section of another embodiment of a fitting made of sheet metal in fitted position of the tubing;
Fig. 9 is a half-view of another embodiment of the fitting with a body in one piece and in locked position;
Fig, 10 is a view of the marking on one of the faces of the tubing;
Fig. 11 is a view of the presentation of the tubing for assembly in the fitting;
Fig, 12 is a view of the fit of the tubing in the fitting;
Fig, 13 is a view of the tubing locked in the fitting;
Fig, 14 is a half-view in longitudinal section of an embodi-ment of a fitting in assembled position;
Fig. 15 is a half-view in section of the same fitting as Fig. 14 in locked position;
Fig, 16 is a half-view in section of another embodiment of the fitting in assembled position;
Fig. 17 is a view in section of the same fitting as Fig. 16 in locked position.
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DESCRIPTION OF THE PREFERRED EMBODIMENTS
_ Referring now to the d~awings, ~ig. 1 shows a fitting which comprises a body 1 having a threaded part 23 on which is screwed a nut 7 which is in abutment against a shoulder ld of the body in order to constitute a housing having an inlet bore 7c for a multilayer flexible tubing ~ constituted by at least three layers, viz. a plastics tube 8c, a braided sheath 8b and a wearing layer 8a. A~ter the bore 7c there is provided a cylindrical housing 7a in which is mounted, in free rotation, a ring 6 which is axially held prisoner between the shoulder ld of the body and a shoulder 7b of the nut.
The rotary ring 6 presents, near the bore 7c, a gripping ridge 6b extending radially inwardly, followed by a generally conical part 6a. A ter the ring 6, the body has a bore 22 of diameter equal to the large diameter of the cone 6a and a tapped part lc in which is screwed a ring 4 crimped at lh and presenting a housing 4a in the form of a hollow hexagon. ~he ring 4 pre-sents a shoulder against which abuts an O-ring 3 which is held on the opposite side by a ring 2 subjected to the action of a spring r in abutment against the end of a bore lb provided in the body. Inside the fitting thus defined, there is moun-ted to slide and rotate a bush 5 having a tubular ~errule 5c guided in a bore lf of the body, in the rings 2 and 4 and by the O-ring 3 forming seal and cooperating with a shallow groove 5d, said bush comprising in its median part a boss 5b in the form of a hexagon adapted to engage in the hexagonal housing 4a to ensure the locking of the bush 5 in rotatlon.
At the end opposite the tubular ferrule, the bush 5 has a toothed ferrule having at least two teeth 5a on which is engaged the end of the tubing 8. The bush 5 is immobilised in translation by the annular O-ring 3 engaged in the groove 5d of the bush and in rotation by the hexagonal boss 5b adapted to be engaged in the corresponding housing 4a of the ring 4.
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The fitting according to the invention is used as follows:
The user having lubricated the end of ~he tubing 8 on the inside and outside, introduces said tubing into the bore 7c ~top half-view of Fig. l) and pushes it against the gripping ridge 6b of the ring 6 so that the tube is compressed slightly to occupy the position 8d and then it takes its normal diameter again to be engaged on the toothed ferrule of the bush 5 and surmount the gripping teeth 5a where it remains seized until the tubing 8 abuts at the end of the fitting on boss 5b of the bush. The fitting on the bush is obtained by alternately pushing and turning the tubing through 90 and 180. During fitting, the bush 5 is immobilised in rotation and in translation due to the engagement of the hex-agonal boss 5b in the corresponding housing 4a integral with the body.
The fitting is then locked, thls being obtained by pulling on the tubing either manually or by a sufficient pressure of fluid axerted on the socket 5 which acts as a piston with the 0-ring 3.
This results in an axial displac~ment of the bush 5 which comes into the position shown in the bottom half-view of Fig 1.
The swollen part 8e of the tubing progressively bears on the cone 6a of the ring 6 and the tubing undergoes a gradually stronger radial, annular compression with wedge effect, since it is gripped between the bush 5 and the rotary ring 6.
When the limit of compressibility of the tubing is reached, the axial stroke stops in a position shown in the bottom half-view of Fig. 1.
The pressurised fluid acting on the bush 5 and the 0-ring
3, maintains a permanent axial thrust on the zone of seal of the channels, this allowing a constant tightness in time whatever the thermal cycles ~within the limits authorised by the seal and the tubing). Ageing and hot creeping are therefore not to be feared : ':
.
The assembly constituted by the tubing 8, the bush 5 and -the ring 6, may rotate, when the ~ittiny is locked with or without pressure and this avoids any kinking of the tubing on assembly, and enables the fitting to ~e unscrewed from an apparatus, without dismantling the tubing, and re-assembly. In fact, the bush 5 being disengaged from the hexagonal housing 4a, it is no longer immobilised in rotation and the above-mentioned assembly may be animated by a rotary movement.
As shown in Fig. 1, the spring r, by pushing the ring 2 on the O-ring 3, efEects a permanent compensation of the seal of the O-ring. This arrangement is very useful when the extreme varia-tions in temperature are considerable.
The annular seal 3 may present different forms apart from the O-ring shown and it may be constituted in particular by a lipped seal or anti-extrusion washers which can resist high pressures.
Fig. 2 shows a simplified version of the fitting which does not comprise any elastic compensation by means of a spring on seal 3. The seal 3 is mounted in a groove la machined in the body. The hexagonal housing 4a in which the boss 5b of the bush may engage for immobilising the bush 5, is made directly in the body 1.
The fitting shown in its fitted position in Fia. 3 is con-stituted by an inexpensive, standardised body or cartridge 19, of cylindrical external form, fitted in a bore of a ferrule l whose edge lu is crimped to occupy the position lt in a groove l9b of the body 19. This body or cartridge 19 may also be screwed and crimped or simply screwed on a ferrule l or an apparatus.
A seal 21 may be mounted between the body 19 and the ferrule l constituted by an O-ring or a sealed bonding.
Furthermore the rotary ring 9 is made with a flange 9c which is engaged in a groove l9a of the body l9 and it is provided with a ~lot extending over half of its length, in order to render it elastic and thus to allow it to be forcibly fitted by elasticity in body l9. This assembly of the rotary ring 9 renders it ir-removable and allows it to rotate.
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Fig. 4 shows, in locked position, a fitting which comprises a monobloc body 1 in which is mo~mted a non-split rotary ring 9, which presents a groove 9c located opposite another groove ls of the body 1 so as to form a toric housing in which is engaged an elastic retaining ring 18 ensuring the axial locking of the ring 9 but nonetheless allowing rotation thereof.
Fig. 5 is a variant embodiment of -the fitting of Fig. 2 which constitutes a complete accessory adapted to be screwed on different known types of fittings to transform them into instant fittings for multilayer tubings.
To this end, a sufficiently long nut 7 is used, screwed on a threading 18 of a body 1 of fitting of known type, said nut 7 in-ternally receiving a screwed sleeve 10 which presents a bore lOb and a hexagonal housing lOd identical to the housing 4a of Figs. 1 and 2 and of which the shapes in contact with the fitting 1 are complementary thereof The top half-view of Fig. 5 shows a conical fitting lOa with cutting ring or conical bush. The bottom half-view of Fig. 5 shows a so-called compression fitting with its radius 11 and its guide lk.
The assembly of parts 10 or 11 of the bush 5 of the seal 3 or lla of the rotary ring 6 and the nut 7 -forms a complete accessory which may be used without modification.
This assembly may be mounted on cutting ring, compression, collet or flat face fittings.
The rotary ring 6 comprises a gripping ridge 6b and a conical part as described hereinabove; however, there are provided on~ the cone two catching teeth 6c and 6d on which the tubing catches and is locked after determined axial stro~e and compression.
Of course, it is possible to provide one or more teeth on the ring 6.
., i , , ', . :
Fig~ 6 shows a fitting in which the body 1 comprises a tapping 20 in which is engaged a hollow screw 12 which replaces the nut 7 and the rotary ring 6.
In order that the tubing in locked position may rotate in working position, the cone 12a and the gripping ridge 12b are subjected to an anti-adherent surface treatment which replaces the rotary ring 6.
To avoid the bush 5 escaping with the tubing, by an excess of sliding, a flange 5e is provided on the bush 5, so that said flange 5e comes into abutment on the screw 12.
Fig. 7 shows a variant embodiment of the fi~.ting of Fig. 6, in locked position, in which the flange 5e is replaced by a washer 13 ~buttin~ on the boss 5b oE the bush.
The monobloc body 1 receives a rotary ring 15 held by a washer 14 on which a crimped edge lm of the body 1 is bent.
Fig. 8 shows another embodiment of a fittlng in locked posi-tion which comprises a tubular end ls adapted to be fixed in the majority of the known fittings (with cutting ring, compression, etc..... ......) The body 1 has a tapping 20 in which are screwed a ring 16 having a hexagonal housing 16a adapted to receive the boss 5b of the bush 5 and a piece 17 made from stamped sheet metal. Inside the piece 17 is mounted a rotary piece 17c made of thin sheet metal, guided in the cone 17b and in abutment against the gripping ridge 17a.
Fig. 9 shows another embodiment of a fitting in locked posi-tion whi.ch comprises a monoblock body 1 internally provided with the. diferent bores and housings shown in Fig. 2 which may be made either by turning and boring directly with an outer from l_ and an inner from 1~, or by cutting-off, reserving a thin tubular part ln adapted to be shaped to present the final form lq and lr.
~ t the other end of the body 1, the general shape is cylindri~
cal with a groove lt. This shape is adapted for a direct assembly in instant fittings of the female type.
~: :. .: . :: :
, . .
Fiys 10, 11, 12, 13 show a method of verifying that the tubing has been correctly fitted in the fitting, said method en-abling the depth of fit and the locking to be checked.
Fig. 10 shows a tubing 8 on which are printed several series of marking signs, a first series of arrows 8f indicating the direc-tion of fit of the tubing in the fitting; a second series of transverse lines 8d regularly spaced apart by a distance ~ which corresponds to the length to be fitted, and a third series of square marks 8e spaced by a distance B from the lines 8d and which gives the stroke of locking.
The same marking is made on the opposite side on the tubing but in the reverse direction for assembling the other end.
When the tubing is to be fitted, it is firstly cut along line 8d as shown in Fig. 10 to separate the unwanted part 8g.
The tubing being internally and externally lubricated, it is fitted as described previously until the line 8d (Fig. 12) is flush with the fitting, so that the fitting is correct and checked.
1Ocking is then effected by pulling on the tubing 8 until the square mark 8e is flush with the fitting 7 as shown in Fig. 13.
This method thus makes it possible to check whether the locked position is correct.
If there is a doubt concerning the assembly, the cycle may be started again by pushing the tubing to check the fit and pulling it to verify the locking thereof.
If the pressure of the fluid is sufficient, locking is effec-ted automatically ~der the pressure of the fluid; it is then sufficient to check the appearance of the square mark 8e whose stroke B in minimum.
If the tubings do not or could not comprise any marking, it is posslble to provide on the outside of the fitting a mark 24 , : . ,, . . ~ .
'' :' '' ' . ' '" ' '~
, . , . . ' ` ` , .
';, ~A~
for checking the fit of the tubing and a mark 25 for checking the locking. The user having a non-marked tubing makes the marks on the tubing himself by means of a marking member and using marks 24 and 25 which figure on the fitting to determine the dis-tance A for fit and distance B for lockin~.
The present invention finds its applications for all multilayer flexible tubings having a sufficient possibility of "tightening" and "extension" for their differences in diameter to be fairly large to permit the automatic manual assembly without excessive efforts.
This type of fitting is used for automobile braking tubing, braided PVC tubings, much used on machines or water, lubricating liquids or coolants (oils, soapsuds, emulsion), used also for sprinkling, for dispensing liquid foodstuff, for compressed air, agricultural treatment and hydraulic servo-control.
However, this fitting ~evice is used with multi-layer flexible tubings having a sufficient possibility of tightening and extension for the differences in diameters obtained to allow locking.
However, it has been ascertained that this fitting may be used with tubings of greater rigidity, particularly multi-layer high pressure tubings in which there is little possibility of extension and tightening.
The following embodiment has for its object an improvement in the fitting, enabling tubings of greater rigidity to be used.
The fitting shown in Figs. 14 and 15 comprises, as in the preceding embodiment, a body l on which is screwed a nut 7 having a cylindrical housing 7a in which is mounted , a rotary ring 6 which is axially held prisoner between a shoulder 7b of the body and an elastic ring or clip 27 engaged in a groove 6c in the rotary ring.
The rotary ring 6 has an inlet bore 6e of a flexible multi-layer tubing 8, a bead 6b forming constriction, extending radially to the outside, followed by a generally conical portion 6a, Furthermore, the bod~ 1 presents a housing 30 in the form of a hexagon followed by a tapped hole lc in which i5 screwed a ring 4 against which abuts an anti-extrusion washer 2 and an 0-ring 3 disposed in the housing la of -the body 1.
Inside the fitting thus defined is slidably and rotatably mounted a bush 5 having a tubular ferrule 5c guided over its whole len~th in a bore le of the body, b~ the 0-ring 3, the washer 2 and the ring 4, said bush comprising in its median part a boss 5b in the form of a hexagon adapted to engage in the hexagonal housing 30 to ensure locking o~ the bush 5.
At the end opposite the tubular ferrule, the bush 5 presents a toothed ferrule having teeth 5a and a channel or tooth 5g of larger diameter than teeth 5a on which the end of the pipe 8 is engaged.
Following the tooth or channel 5X there is provided a groove 5e in which is mounted an 0-ring 28 in contact with the inner surface of the tubing 8. A rounded part 29 provided on the bush 5 between the groove 5e and the boss 5b is adapted to receive the end of the tubing 8 when said latter is tightened, as shown in Fig. 15, A split ring 26 is interposed between the conical . ~ . . , , ~. . , . ;, ~ , . : .
:. : :. ~. , -portion 6e of the ring 6 and the outer surface of the tubing 8, said ring being provided externally with a conical portion 26a cooperating with the conical portion 6a and internally with a series of teeth 26b adapted to be engaged in the outer wall of the tubing 8. The ring 26 has at least two longitudinal slots such as 26f which give it suitable elasticity for assembly on the tubing 8.
The ring 26 is adapted to come into abutment against a shoulder 6d of the rotary ring 6.
The split ring 26 which allows the tubing 8 to be assembled is driven during the period of locking of the tubing by the tubing itself, along the conical portion 6a, this tightening the ring 26 on the tubing by its teeth 26b, so that the tubin~ is securely gripped between the teeth 5a and the teeth 26b, This powerful tightening effort is calculated as a function of the tubing, its thickness and its actual capacity of compression. The longitudinal stroke of the bush 5 and of the tubing 8, the angle of the conical portion 6a are provided to obtain the effort and compression necèssary for the tubings used.
The bush 5 presents a large outer diameter preventing ejection thereof, and it may come into positive abutment axially in the ring 9.
The assembly as shown in Figs. 14 and 15 is intended to allow a permanent axial thrust on part 8f of the tubing. Furthermore, this fitting may be used with tubings allowing a slight extension along 8e of the tubing, due to the presence of a tooth Sg of larger diameter than the teeth .
: ,: :, :. , , : :, ;, .. ..
, ::: ;
, . " .. ..
: ~ , or channels 5a.
Figs. 16 and 17 show another embodiment of the fitting in which the rotary ring 6 has been eliminated and the conical,portion 7f is made directly in the nut 7, so that the ring 26 is in contact, by its conical portion 26a, with the conical portion 7f.
As in the preceding embodiment, the split ring 26 tightens the tubing 8 by its teeth 26b and has slots 26f.
The fitting shown in Figs. 16 and 17 is used more particularly for assembling a tubing 8 which has virtually no possibility of extension.
The bush 5 comprises a flange 5f against which abuts the end 26e of the ring ~6, the other end of which is adapted to abut against the shoulder 7e of the nut 7.
As in the preceding embodiment, the tubing 8 is manually mounted by force on the bush 5, whilst the boss , `~
5b is engaged in the housing 30 and locking is effected by pulling on the tubing 8 which drives the bush 5 whose flange Sf comes into abutment against the end 26e of the ring 26 displacing said ring in the direction of the conical portion 7f of the nut 7, so that the end of the tubing 8 is held compressed between the bush 5 and the ring 26. Locking stops when the split ring 26 comes into abutment against the shoulder 7e.
In this case, the conical portion 7f and part 7h comprise an anti-adherent coating allowing easier rotation and locking of the tubing.
As the bush 5 extends by its tubular ferrule 5c in the bore le of the body, it is possible to push the bush axially by said ferrule 5c in order to proceed with , .: , -,.: : - , :, :
-: , ., . : :
, locking, This operation may be effected manually, by means of a jack or a threaded part. In this case, locking is energetic and complete, which may be highly advantageous for the mass manufacture of high pressure flexible tubings.
Verification, checking and locking of manufactured flexible tubings may be effected by drawing on a traction machine.
:... ~ , .. .
: j. . .. . .
.- : : .. :: ; . :: . . ::
.
The assembly constituted by the tubing 8, the bush 5 and -the ring 6, may rotate, when the ~ittiny is locked with or without pressure and this avoids any kinking of the tubing on assembly, and enables the fitting to ~e unscrewed from an apparatus, without dismantling the tubing, and re-assembly. In fact, the bush 5 being disengaged from the hexagonal housing 4a, it is no longer immobilised in rotation and the above-mentioned assembly may be animated by a rotary movement.
As shown in Fig. 1, the spring r, by pushing the ring 2 on the O-ring 3, efEects a permanent compensation of the seal of the O-ring. This arrangement is very useful when the extreme varia-tions in temperature are considerable.
The annular seal 3 may present different forms apart from the O-ring shown and it may be constituted in particular by a lipped seal or anti-extrusion washers which can resist high pressures.
Fig. 2 shows a simplified version of the fitting which does not comprise any elastic compensation by means of a spring on seal 3. The seal 3 is mounted in a groove la machined in the body. The hexagonal housing 4a in which the boss 5b of the bush may engage for immobilising the bush 5, is made directly in the body 1.
The fitting shown in its fitted position in Fia. 3 is con-stituted by an inexpensive, standardised body or cartridge 19, of cylindrical external form, fitted in a bore of a ferrule l whose edge lu is crimped to occupy the position lt in a groove l9b of the body 19. This body or cartridge 19 may also be screwed and crimped or simply screwed on a ferrule l or an apparatus.
A seal 21 may be mounted between the body 19 and the ferrule l constituted by an O-ring or a sealed bonding.
Furthermore the rotary ring 9 is made with a flange 9c which is engaged in a groove l9a of the body l9 and it is provided with a ~lot extending over half of its length, in order to render it elastic and thus to allow it to be forcibly fitted by elasticity in body l9. This assembly of the rotary ring 9 renders it ir-removable and allows it to rotate.
, ~
Fig. 4 shows, in locked position, a fitting which comprises a monobloc body 1 in which is mo~mted a non-split rotary ring 9, which presents a groove 9c located opposite another groove ls of the body 1 so as to form a toric housing in which is engaged an elastic retaining ring 18 ensuring the axial locking of the ring 9 but nonetheless allowing rotation thereof.
Fig. 5 is a variant embodiment of -the fitting of Fig. 2 which constitutes a complete accessory adapted to be screwed on different known types of fittings to transform them into instant fittings for multilayer tubings.
To this end, a sufficiently long nut 7 is used, screwed on a threading 18 of a body 1 of fitting of known type, said nut 7 in-ternally receiving a screwed sleeve 10 which presents a bore lOb and a hexagonal housing lOd identical to the housing 4a of Figs. 1 and 2 and of which the shapes in contact with the fitting 1 are complementary thereof The top half-view of Fig. 5 shows a conical fitting lOa with cutting ring or conical bush. The bottom half-view of Fig. 5 shows a so-called compression fitting with its radius 11 and its guide lk.
The assembly of parts 10 or 11 of the bush 5 of the seal 3 or lla of the rotary ring 6 and the nut 7 -forms a complete accessory which may be used without modification.
This assembly may be mounted on cutting ring, compression, collet or flat face fittings.
The rotary ring 6 comprises a gripping ridge 6b and a conical part as described hereinabove; however, there are provided on~ the cone two catching teeth 6c and 6d on which the tubing catches and is locked after determined axial stro~e and compression.
Of course, it is possible to provide one or more teeth on the ring 6.
., i , , ', . :
Fig~ 6 shows a fitting in which the body 1 comprises a tapping 20 in which is engaged a hollow screw 12 which replaces the nut 7 and the rotary ring 6.
In order that the tubing in locked position may rotate in working position, the cone 12a and the gripping ridge 12b are subjected to an anti-adherent surface treatment which replaces the rotary ring 6.
To avoid the bush 5 escaping with the tubing, by an excess of sliding, a flange 5e is provided on the bush 5, so that said flange 5e comes into abutment on the screw 12.
Fig. 7 shows a variant embodiment of the fi~.ting of Fig. 6, in locked position, in which the flange 5e is replaced by a washer 13 ~buttin~ on the boss 5b oE the bush.
The monobloc body 1 receives a rotary ring 15 held by a washer 14 on which a crimped edge lm of the body 1 is bent.
Fig. 8 shows another embodiment of a fittlng in locked posi-tion which comprises a tubular end ls adapted to be fixed in the majority of the known fittings (with cutting ring, compression, etc..... ......) The body 1 has a tapping 20 in which are screwed a ring 16 having a hexagonal housing 16a adapted to receive the boss 5b of the bush 5 and a piece 17 made from stamped sheet metal. Inside the piece 17 is mounted a rotary piece 17c made of thin sheet metal, guided in the cone 17b and in abutment against the gripping ridge 17a.
Fig. 9 shows another embodiment of a fitting in locked posi-tion whi.ch comprises a monoblock body 1 internally provided with the. diferent bores and housings shown in Fig. 2 which may be made either by turning and boring directly with an outer from l_ and an inner from 1~, or by cutting-off, reserving a thin tubular part ln adapted to be shaped to present the final form lq and lr.
~ t the other end of the body 1, the general shape is cylindri~
cal with a groove lt. This shape is adapted for a direct assembly in instant fittings of the female type.
~: :. .: . :: :
, . .
Fiys 10, 11, 12, 13 show a method of verifying that the tubing has been correctly fitted in the fitting, said method en-abling the depth of fit and the locking to be checked.
Fig. 10 shows a tubing 8 on which are printed several series of marking signs, a first series of arrows 8f indicating the direc-tion of fit of the tubing in the fitting; a second series of transverse lines 8d regularly spaced apart by a distance ~ which corresponds to the length to be fitted, and a third series of square marks 8e spaced by a distance B from the lines 8d and which gives the stroke of locking.
The same marking is made on the opposite side on the tubing but in the reverse direction for assembling the other end.
When the tubing is to be fitted, it is firstly cut along line 8d as shown in Fig. 10 to separate the unwanted part 8g.
The tubing being internally and externally lubricated, it is fitted as described previously until the line 8d (Fig. 12) is flush with the fitting, so that the fitting is correct and checked.
1Ocking is then effected by pulling on the tubing 8 until the square mark 8e is flush with the fitting 7 as shown in Fig. 13.
This method thus makes it possible to check whether the locked position is correct.
If there is a doubt concerning the assembly, the cycle may be started again by pushing the tubing to check the fit and pulling it to verify the locking thereof.
If the pressure of the fluid is sufficient, locking is effec-ted automatically ~der the pressure of the fluid; it is then sufficient to check the appearance of the square mark 8e whose stroke B in minimum.
If the tubings do not or could not comprise any marking, it is posslble to provide on the outside of the fitting a mark 24 , : . ,, . . ~ .
'' :' '' ' . ' '" ' '~
, . , . . ' ` ` , .
';, ~A~
for checking the fit of the tubing and a mark 25 for checking the locking. The user having a non-marked tubing makes the marks on the tubing himself by means of a marking member and using marks 24 and 25 which figure on the fitting to determine the dis-tance A for fit and distance B for lockin~.
The present invention finds its applications for all multilayer flexible tubings having a sufficient possibility of "tightening" and "extension" for their differences in diameter to be fairly large to permit the automatic manual assembly without excessive efforts.
This type of fitting is used for automobile braking tubing, braided PVC tubings, much used on machines or water, lubricating liquids or coolants (oils, soapsuds, emulsion), used also for sprinkling, for dispensing liquid foodstuff, for compressed air, agricultural treatment and hydraulic servo-control.
However, this fitting ~evice is used with multi-layer flexible tubings having a sufficient possibility of tightening and extension for the differences in diameters obtained to allow locking.
However, it has been ascertained that this fitting may be used with tubings of greater rigidity, particularly multi-layer high pressure tubings in which there is little possibility of extension and tightening.
The following embodiment has for its object an improvement in the fitting, enabling tubings of greater rigidity to be used.
The fitting shown in Figs. 14 and 15 comprises, as in the preceding embodiment, a body l on which is screwed a nut 7 having a cylindrical housing 7a in which is mounted , a rotary ring 6 which is axially held prisoner between a shoulder 7b of the body and an elastic ring or clip 27 engaged in a groove 6c in the rotary ring.
The rotary ring 6 has an inlet bore 6e of a flexible multi-layer tubing 8, a bead 6b forming constriction, extending radially to the outside, followed by a generally conical portion 6a, Furthermore, the bod~ 1 presents a housing 30 in the form of a hexagon followed by a tapped hole lc in which i5 screwed a ring 4 against which abuts an anti-extrusion washer 2 and an 0-ring 3 disposed in the housing la of -the body 1.
Inside the fitting thus defined is slidably and rotatably mounted a bush 5 having a tubular ferrule 5c guided over its whole len~th in a bore le of the body, b~ the 0-ring 3, the washer 2 and the ring 4, said bush comprising in its median part a boss 5b in the form of a hexagon adapted to engage in the hexagonal housing 30 to ensure locking o~ the bush 5.
At the end opposite the tubular ferrule, the bush 5 presents a toothed ferrule having teeth 5a and a channel or tooth 5g of larger diameter than teeth 5a on which the end of the pipe 8 is engaged.
Following the tooth or channel 5X there is provided a groove 5e in which is mounted an 0-ring 28 in contact with the inner surface of the tubing 8. A rounded part 29 provided on the bush 5 between the groove 5e and the boss 5b is adapted to receive the end of the tubing 8 when said latter is tightened, as shown in Fig. 15, A split ring 26 is interposed between the conical . ~ . . , , ~. . , . ;, ~ , . : .
:. : :. ~. , -portion 6e of the ring 6 and the outer surface of the tubing 8, said ring being provided externally with a conical portion 26a cooperating with the conical portion 6a and internally with a series of teeth 26b adapted to be engaged in the outer wall of the tubing 8. The ring 26 has at least two longitudinal slots such as 26f which give it suitable elasticity for assembly on the tubing 8.
The ring 26 is adapted to come into abutment against a shoulder 6d of the rotary ring 6.
The split ring 26 which allows the tubing 8 to be assembled is driven during the period of locking of the tubing by the tubing itself, along the conical portion 6a, this tightening the ring 26 on the tubing by its teeth 26b, so that the tubin~ is securely gripped between the teeth 5a and the teeth 26b, This powerful tightening effort is calculated as a function of the tubing, its thickness and its actual capacity of compression. The longitudinal stroke of the bush 5 and of the tubing 8, the angle of the conical portion 6a are provided to obtain the effort and compression necèssary for the tubings used.
The bush 5 presents a large outer diameter preventing ejection thereof, and it may come into positive abutment axially in the ring 9.
The assembly as shown in Figs. 14 and 15 is intended to allow a permanent axial thrust on part 8f of the tubing. Furthermore, this fitting may be used with tubings allowing a slight extension along 8e of the tubing, due to the presence of a tooth Sg of larger diameter than the teeth .
: ,: :, :. , , : :, ;, .. ..
, ::: ;
, . " .. ..
: ~ , or channels 5a.
Figs. 16 and 17 show another embodiment of the fitting in which the rotary ring 6 has been eliminated and the conical,portion 7f is made directly in the nut 7, so that the ring 26 is in contact, by its conical portion 26a, with the conical portion 7f.
As in the preceding embodiment, the split ring 26 tightens the tubing 8 by its teeth 26b and has slots 26f.
The fitting shown in Figs. 16 and 17 is used more particularly for assembling a tubing 8 which has virtually no possibility of extension.
The bush 5 comprises a flange 5f against which abuts the end 26e of the ring ~6, the other end of which is adapted to abut against the shoulder 7e of the nut 7.
As in the preceding embodiment, the tubing 8 is manually mounted by force on the bush 5, whilst the boss , `~
5b is engaged in the housing 30 and locking is effected by pulling on the tubing 8 which drives the bush 5 whose flange Sf comes into abutment against the end 26e of the ring 26 displacing said ring in the direction of the conical portion 7f of the nut 7, so that the end of the tubing 8 is held compressed between the bush 5 and the ring 26. Locking stops when the split ring 26 comes into abutment against the shoulder 7e.
In this case, the conical portion 7f and part 7h comprise an anti-adherent coating allowing easier rotation and locking of the tubing.
As the bush 5 extends by its tubular ferrule 5c in the bore le of the body, it is possible to push the bush axially by said ferrule 5c in order to proceed with , .: , -,.: : - , :, :
-: , ., . : :
, locking, This operation may be effected manually, by means of a jack or a threaded part. In this case, locking is energetic and complete, which may be highly advantageous for the mass manufacture of high pressure flexible tubings.
Verification, checking and locking of manufactured flexible tubings may be effected by drawing on a traction machine.
:... ~ , .. .
: j. . .. . .
.- : : .. :: ; . :: . . ::
Claims (27)
1. A fitting for flexible tubing for fluids, in which the tubing can be engaged by axial thrust into the fitting, said fitting comprising a body internally provided with a cylindrical inlet whose diameter is substantially equal to that of the tubing, means for compressing the tubing within the fitting adjacent the cylindrical inlet, said compressing means being followed by a generally conical portion, increasing in diameter from the compressing means into the fitting, said body having a bore ad-jacent the large diameter end of the conical portion and cor-responding in diameter thereto, said conical portion internally receiving a rotatable bush with external gripping teeth on which an end of the tubing can be engaged, said bush having a cylindrical extension engaged in a bore of the body, said bush having an external groove in which an annular seal is disposed, said bush being axially movable to a position locked against rotation when the tubing is pushed into the fitting, and the tubing being gripped between the rotatable toothed bush and the conical por-tion of the body when the tubing and fitting are under tension.
2. A fitting as defined in Claim 1, wherein, between the bore following the conical portion and the bore receiving the cylindrical part of the bush, there is provided a housing having at least one flat surface which cooperates with at least one corresponding surface provided on the bush, so that the bush is locked in rota-tion when it is engaged at the end of the fitting.
3. A fitting as defined in Claim 1, wherein the cylindrical part of the bush is surrounded by an annular seal.
4. A fitting according to Claim 1, wherein said means for compressing the tubing comprise a bead extending radially inwardly and constituting a gripping ridge.
5. A fitting as defined in Claim 4, wherein said bead is a ring mounted inside the body having said gripping ridge and the conical portion, said ring being axially immobilised and mounted to rotate freely inside the body.
6. A fitting as defined in Claim 5, wherein the ring pre-senting the gripping ridge and the conical portion is mounted to rotate but axially prisoner in a nut screwed on the body of the fitting, said nut having the inlet bore for the tubing.
7. A fitting as defined in Claim 1, wherein said compressing means comprise a ring presenting a gripping ridge, the conical portion and the inlet bore for the tubing is split longitudinally over a part of its length and presents a catching tooth which is engaged in a groove of the body in which it is mounted imprisoned and rotary.
8. A fitting as defined in Claim 1, wherein said compressing means comprise a ring which is mounted to rotate in the body and is axially immobilised by a further ring partially engaged in grooves located opposite and provided in the first mentioned ring and in the body.
9. A fitting as defined in Claim 1, wherein said compressing means comprise a rotary ring which presents in its conical portion at least one tooth for blocking the tubing.
10. A fitting as defined in Claim 1, wherein said compressing means comprise a ring presenting a gripping ridge and the inlet bore for the tubing, the gripping ridge and the conical portion are shaped inside said ring screwed in the body and subjected internally to an anti-adherent surface treatment enabling the tubing and the bush to rotate.
11. A fitting as defined in Claim 1, wherein said compressing means comprise a ring presenting a gripping ridge and the inlet bore, the gripping ridge and the conical portion are made inside a piece made of thin stamped sheet metal, screwed in the body and in abutment against said ring provided with a thin, rotary conical piece, itself screwed in the body, said ring presenting the housing for locking the bush carrying the tubing in rotation.
12. A fitting as defined in Claim 1, wherein said compressing means comprise a ring presenting a gripping ridge and the gripping ridge is axially immobilised by a stop washer crimped in the body.
13. A fitting as defined in Claim 1, wherein said compressing means comprise a ring presenting a gripping ridge and the inlet bore for the tubing, the gripping ridge and the conical part are made directly in the machined body, said conical part comprising a non-stick coating.
14. A fitting as defined in Claim 10, wherein the bush presents, near the part comprising the means for locking in rotation, a flange of larger diameter than the gripping ridge, at least equal to the diameter of the expanded tubing.
15. A fitting as defined in Claim 12, wherein a washer of diameter larger than the gripping ridge and at least equal to the diameter of the expanded tubing is disposed on the bush between the part comprising the means for locking in rotation and the tubing.
16. A fitting as defined in Claim 9, wherein the body com-prising a housing adapted to receive the rotary ring presents a generally cylindrical outer form and an outer groove made at a suitable distance from the annular seal of the bush, so as to constitute a cartridge inserted directly in an apparatus or in a simplified fitting element.
17. A fitting as defined in Claim 9, wherein the body is con-stituted by a nut with long tapping internally receiving the rotary ring and a screwed sleeve carries the annular seal and adapted to receive the end part of the bush, so as to constitute an assembly constituting an accessory for screwed fitting.
18. A fitting as defined in Claim 1, wherein said compressing means comprise a split ring which is interposed between the conical portion of the body and the outer surface of the tubing which is engaged on the bush, said ring externally having a conical portion cooperating with the conical portion of the body and, internally, a series of teeth or channels adapted to be engaged in the outer wall of the tubing.
19. A fitting as defined in Claim 18, wherein the ring is provided with at least two longitudinal slots giving the ring a suitable elasticity.
20. A fitting as defined in Claim 18, wherein the body has a shoulder against which the ring is adapted to abut by one of its ends.
21. A fitting as defined in Claim 18, wherein the bush has a large outer diameter preventing ejection thereof, and it is adapted to come into positive abutment axially in the ring.
22. A fitting as defined in Claim 18, wherein the bush is adapted to abut by a collar against the end of the ring.
23. A fitting as defined in Claim 18, wherein the bush comprises a rounded portion on which is engaged the end of the tubing when said latter is tightened between the bush and the ring.
24. A fitting as defined in Claim 18, wherein the bush is provided with a groove in which is disposed an O-ring in contact with the inner surface of the tubing.
25. A fitting as defined in Claim 24, wherein the O-ring is mounted in the body with an anti-extrusion washer.
26. A fitting as defined in Claim 18, wherein the rotary ring, mounted in the body and having a conical portion, is provided on the outside with a groove in which is disposed a clip or elastic ring adapted to abut against the body.
27. A fitting as defined in Claim 18, wherein the bush with external gripping teeth is extended inside the bore of the body as far as the end thereof.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7706998A FR2383385A1 (en) | 1977-03-09 | 1977-03-09 | IMPROVED QUICK COUPLINGS FOR FLEXIBLE HOSES REINFORCED MULTI-LAYER FOR FLUIDS |
| FR77.06.998 | 1977-03-09 | ||
| FR7723293A FR2398958A2 (en) | 1977-07-28 | 1977-07-28 | IMPROVED QUICK COUPLINGS FOR FLEXIBLE HOSES REINFORCED MULTI-LAYER FOR FLUIDS |
| FR77.23.293 | 1977-07-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1094126A true CA1094126A (en) | 1981-01-20 |
Family
ID=26219887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA298,433A Expired CA1094126A (en) | 1977-03-09 | 1978-03-07 | Instant fittings for reinforced multilayer flexible tubings for fluids |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1094126A (en) |
-
1978
- 1978-03-07 CA CA298,433A patent/CA1094126A/en not_active Expired
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