CA1325449C - Pipe coupling - Google Patents
Pipe couplingInfo
- Publication number
- CA1325449C CA1325449C CA 602555 CA602555A CA1325449C CA 1325449 C CA1325449 C CA 1325449C CA 602555 CA602555 CA 602555 CA 602555 A CA602555 A CA 602555A CA 1325449 C CA1325449 C CA 1325449C
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- coupling
- diameter
- sleeve
- flange
- 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 - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/14—Flanged joints
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Flanged Joints, Insulating Joints, And Other Joints (AREA)
Abstract
ABSTRACT
A coupling element for a pipe is disclosed. The coupling element has a proximal pipe-receiving end and a distal coupling end. The coupling has a sleeve portion, the inner diameter of the sleeve corresponding to the outer diameter of the pipe. A first flange portion projects radially inwardly at the distal end of the sleeve by a dimension corresponding to the thickness of the pipe wall.
The inner annular surface of the flange is axial and has a relatively smooth surface. A second flange portion projects radially outwardly from the distal end of the sleeve. The distal ends of the first and second flange portions are integral and constitute a radial abutment surface, for abutting the corresponding abutment surface of an identical coupling element. Means are provided for retaining a pipe inserted in the proximal end of the sleeve within the sleeve abutting the first flange portion. Such means may be, for example, at least a portion of the sleeve portion having internal threads adapted to receive an externally threaded pipe.
A coupling element for a pipe is disclosed. The coupling element has a proximal pipe-receiving end and a distal coupling end. The coupling has a sleeve portion, the inner diameter of the sleeve corresponding to the outer diameter of the pipe. A first flange portion projects radially inwardly at the distal end of the sleeve by a dimension corresponding to the thickness of the pipe wall.
The inner annular surface of the flange is axial and has a relatively smooth surface. A second flange portion projects radially outwardly from the distal end of the sleeve. The distal ends of the first and second flange portions are integral and constitute a radial abutment surface, for abutting the corresponding abutment surface of an identical coupling element. Means are provided for retaining a pipe inserted in the proximal end of the sleeve within the sleeve abutting the first flange portion. Such means may be, for example, at least a portion of the sleeve portion having internal threads adapted to receive an externally threaded pipe.
Description
1 3254~9 This invention relates to couplings for joining abutting ends of pipe.
There are of course many varieties O:e pipe couplings in existence. ~owever, there is a need, not satisfied by any product presently available, for a pipe coupling for plastic drainage pipe and the like which can produce a joint which is secure, simple, and has no inwardly projecting portions to interfere with flow through the pipe. The joint should be secure, but preferably not permanent, i.e. it should preferably be possible to uncouple the joined pipe ends.
Though the invention should not be considered to be limited to such pipe, the plastic pipe of prlmary concern is typically of four or five inches in diameter, having a relatively smooth inner surface/ and an outer surface bearing ribs for rigidity, the ribs typically being spiralled in thread-like fashion.
It is an object of the invention to provide an improved pipe coupling which does not offer any obstruction to or restriction of flow through the pipe.
Thus in accordance with one aspect of the present invention there is provided a coupling element for a pipe, the coupling element having a proximal pipe-receiving end and a distal coupling end. The coupling has a sleeve portion the inner diameter of the sleeve corresponding to the outer diameter of the pipe. A first flange portion projects radially inwardly at the distal end of the sleeve by a dimension corresponding to the thickness of the pipe wall.
The inner annular surface of the flange is axial and has a . .
.: :
, ~ 1 32s44q relatively smooth surface. A second flange portion projects radially outwardly from the distal end of the sleeve. The distal ends of the first and second flange portions are integral and constitute a radial abutment surface~ for abutting the corresponding abutment surface of an identical coupling element. Means are provided for retaining a pipe inserted in the proximal end of the sleeve wit:hin the sleeve abutting the first flange portion.
In accordance with another aspect of the invention, for use with an externally threaded pipe, at least a portion of the sleeve portion has internal threads adapted to receive the external threads of the pipe.
Further features of the invention will be described or will become apparent in the course of the following detailed description.
In order that the invention may be more clearly understood, the preferred embodiment thereof will now be described in detail by way of example, with reference to the accompanying drawings, in which:
Fig. 1 is a perspective showing the coupling; and Fig. 2 is a cross-section of the coupling.
In the invention, as shown in the drawings, the coupling element 1 a has a proximal pipe-receiving end and a distal coupling end. The coupling has a sleeve portion 2, the inner diameter of the sleeve corresponding to the outer diameter of the pipe 4. A first flange portion 6 projects radially inwardly at the distal end of the sleeve by a dimension corresponding to the thickness of the pipe wall.
.
. ;
:, - , ... . . . .
.
~ ~ 32~44~ :
The inner annular surface of the flange is axial and has a relatively smooth surface. A second flange portion 10 projects radially outwardly from the distal end of the sleeve.
The distal ends of the first and second flange portions could be integral and thus could constitu~e a radial abutment surface, for abutting the corresponding abutment surface of an identical coupling element. In the preferred embodiment, however, to assist in aligning the joint, the two coupling elements are not identical, but instead have male and female versions. The male version, as seen in Figs. 1 and 2, has a cylindrical projection 20, which fits into the corresponding recess 22 in the female version, seen only in Fig. 2.
Means are provided for retaining a pipe inserted in the proximal end of the sleeve within the sleev~ abutting the ~5 first flange portion. In the embodiment preferred for use with externally threaded pipel at least a portion of the sleeve portion 2 has internal threads 14 adapted to receive the external threads 16 of the pipe. The threading then acts as the means for retaining the pipe inserted into the sleeve portion.
Any desireable means of fastening the coupling elements to each other to effect the joint could be used. For example, in the preferred embodiment, each outwardly projecting flange 10 is provided with a plurality of evenly spaced axial holes 18, so that the coupling elements ca~ be fastened together by nuts and bolts. Preferably~ the flanges are provided with indicia to assist in aligning the holes, such as the flat portions 19. That, it, once the flat ..
" : ` ' ` ' . ; .' ' ::
,;... :.
- 1 32544~
portions 19 are aligned, the person making the joint knows that the bolt holes are aligned.
Alternatively, any other kind of clamping means could obviously be used, though preferably such clamping means would include means for preventing not only axial but also radial movement of the coupling elements with respect to each other, i.e. the pipe ends should be kept in alignment as well as clamped together.
For more assured s~aling, if desired, an O-ring 24 can be provided on the proximal side of the inwardly directed flange 6. When the pipe i~ inserted, the O-ring is compressed between the end of the pipe and the flange.
It is a particular advantage of the invention that a smooth, continuous inner wall of the pipe is provided, so that there is no obstruction of flow. There is no reduction of diameter, as is common in prior art couplings. The inner wall of the pipe is aligne~ in relatively precise ~a~hion with the inner annular surface of the inwardly directed flange.
The coupling is preferably though not essentially molded from a plastic material. An economy version could conceivably be made from polypropylene, for example. More sophisticated versions for spe¢ial applications such as for toxic materials or to meet food grade requirements, etc., could be made from more advanced materials such as glass fibre reinforced plastics, Nylon 66, VALOX, HYTREL, etc.
(trademarks). The choice of material is not part of the invention per se. ~here is no reason, for example, why the coupling could not be machined from metal for certain . . ' . . . . -~ . .
~-` 1 3254~q applications, though obviously that may not be economical for most applications~
Preferred dimensions are as follow~, based on u~e with ~xternally threaded pipe of 4 inch nominal diameter:
Overall length~ 1/2 inches for the total coupling, i.e. two coupling :
elements each 5-3/4 inches effective length. Total length of the male coupling element is actually 6-1/4, due to the 1/2 cylindrical projection.
Sleeve wall thickness: 1/2 inch Outer flange diameter: 6-1/2 inches Inner flange diameter (corresponding to pipe internal diameter): 4.10 inches It will be appreciated that the above relates to preferred embodiments of the invention only. Variations will be obvious to those skilled in the art, and such variations are considered to be within the scope of the invention, whether or not expressly referred to above.
.
. . ,;
There are of course many varieties O:e pipe couplings in existence. ~owever, there is a need, not satisfied by any product presently available, for a pipe coupling for plastic drainage pipe and the like which can produce a joint which is secure, simple, and has no inwardly projecting portions to interfere with flow through the pipe. The joint should be secure, but preferably not permanent, i.e. it should preferably be possible to uncouple the joined pipe ends.
Though the invention should not be considered to be limited to such pipe, the plastic pipe of prlmary concern is typically of four or five inches in diameter, having a relatively smooth inner surface/ and an outer surface bearing ribs for rigidity, the ribs typically being spiralled in thread-like fashion.
It is an object of the invention to provide an improved pipe coupling which does not offer any obstruction to or restriction of flow through the pipe.
Thus in accordance with one aspect of the present invention there is provided a coupling element for a pipe, the coupling element having a proximal pipe-receiving end and a distal coupling end. The coupling has a sleeve portion the inner diameter of the sleeve corresponding to the outer diameter of the pipe. A first flange portion projects radially inwardly at the distal end of the sleeve by a dimension corresponding to the thickness of the pipe wall.
The inner annular surface of the flange is axial and has a . .
.: :
, ~ 1 32s44q relatively smooth surface. A second flange portion projects radially outwardly from the distal end of the sleeve. The distal ends of the first and second flange portions are integral and constitute a radial abutment surface~ for abutting the corresponding abutment surface of an identical coupling element. Means are provided for retaining a pipe inserted in the proximal end of the sleeve wit:hin the sleeve abutting the first flange portion.
In accordance with another aspect of the invention, for use with an externally threaded pipe, at least a portion of the sleeve portion has internal threads adapted to receive the external threads of the pipe.
Further features of the invention will be described or will become apparent in the course of the following detailed description.
In order that the invention may be more clearly understood, the preferred embodiment thereof will now be described in detail by way of example, with reference to the accompanying drawings, in which:
Fig. 1 is a perspective showing the coupling; and Fig. 2 is a cross-section of the coupling.
In the invention, as shown in the drawings, the coupling element 1 a has a proximal pipe-receiving end and a distal coupling end. The coupling has a sleeve portion 2, the inner diameter of the sleeve corresponding to the outer diameter of the pipe 4. A first flange portion 6 projects radially inwardly at the distal end of the sleeve by a dimension corresponding to the thickness of the pipe wall.
.
. ;
:, - , ... . . . .
.
~ ~ 32~44~ :
The inner annular surface of the flange is axial and has a relatively smooth surface. A second flange portion 10 projects radially outwardly from the distal end of the sleeve.
The distal ends of the first and second flange portions could be integral and thus could constitu~e a radial abutment surface, for abutting the corresponding abutment surface of an identical coupling element. In the preferred embodiment, however, to assist in aligning the joint, the two coupling elements are not identical, but instead have male and female versions. The male version, as seen in Figs. 1 and 2, has a cylindrical projection 20, which fits into the corresponding recess 22 in the female version, seen only in Fig. 2.
Means are provided for retaining a pipe inserted in the proximal end of the sleeve within the sleev~ abutting the ~5 first flange portion. In the embodiment preferred for use with externally threaded pipel at least a portion of the sleeve portion 2 has internal threads 14 adapted to receive the external threads 16 of the pipe. The threading then acts as the means for retaining the pipe inserted into the sleeve portion.
Any desireable means of fastening the coupling elements to each other to effect the joint could be used. For example, in the preferred embodiment, each outwardly projecting flange 10 is provided with a plurality of evenly spaced axial holes 18, so that the coupling elements ca~ be fastened together by nuts and bolts. Preferably~ the flanges are provided with indicia to assist in aligning the holes, such as the flat portions 19. That, it, once the flat ..
" : ` ' ` ' . ; .' ' ::
,;... :.
- 1 32544~
portions 19 are aligned, the person making the joint knows that the bolt holes are aligned.
Alternatively, any other kind of clamping means could obviously be used, though preferably such clamping means would include means for preventing not only axial but also radial movement of the coupling elements with respect to each other, i.e. the pipe ends should be kept in alignment as well as clamped together.
For more assured s~aling, if desired, an O-ring 24 can be provided on the proximal side of the inwardly directed flange 6. When the pipe i~ inserted, the O-ring is compressed between the end of the pipe and the flange.
It is a particular advantage of the invention that a smooth, continuous inner wall of the pipe is provided, so that there is no obstruction of flow. There is no reduction of diameter, as is common in prior art couplings. The inner wall of the pipe is aligne~ in relatively precise ~a~hion with the inner annular surface of the inwardly directed flange.
The coupling is preferably though not essentially molded from a plastic material. An economy version could conceivably be made from polypropylene, for example. More sophisticated versions for spe¢ial applications such as for toxic materials or to meet food grade requirements, etc., could be made from more advanced materials such as glass fibre reinforced plastics, Nylon 66, VALOX, HYTREL, etc.
(trademarks). The choice of material is not part of the invention per se. ~here is no reason, for example, why the coupling could not be machined from metal for certain . . ' . . . . -~ . .
~-` 1 3254~q applications, though obviously that may not be economical for most applications~
Preferred dimensions are as follow~, based on u~e with ~xternally threaded pipe of 4 inch nominal diameter:
Overall length~ 1/2 inches for the total coupling, i.e. two coupling :
elements each 5-3/4 inches effective length. Total length of the male coupling element is actually 6-1/4, due to the 1/2 cylindrical projection.
Sleeve wall thickness: 1/2 inch Outer flange diameter: 6-1/2 inches Inner flange diameter (corresponding to pipe internal diameter): 4.10 inches It will be appreciated that the above relates to preferred embodiments of the invention only. Variations will be obvious to those skilled in the art, and such variations are considered to be within the scope of the invention, whether or not expressly referred to above.
.
. . ,;
Claims (7)
1. A pipe coupling for joining the ends of two plastic pipes which have external threads, an external diameter D, and a constant inner diameter d, said pipe coupling comprising two coupling elements, each said coupling element comprising:
a cylindrical sleeve having a pipe-receiving end and a coupling end, at least a portion of said sleeve having an inner diameter D and internal threads corresponding to the outer diameter D and external threads of the pipe, and the portion adjacent said coupling end and up to said diameter D
portion having an inner diameter equal to said pipe inner diameter d;
a flange projecting radially outwardly at said coupling end, so as to define a radial abutment surface to abut the corresponding surface of the other said coupling element;
one said coupling element having a male cylindrical projection beyond said abutment surface, with the inner diameter of said cylindrical projection being d, and the other said coupling element having a corresponding female cylindrical recess in the abutment surface thereof, to receive said male cylindrical projection in a close-tolerance fit, thereby acting to align said coupling elements.
a cylindrical sleeve having a pipe-receiving end and a coupling end, at least a portion of said sleeve having an inner diameter D and internal threads corresponding to the outer diameter D and external threads of the pipe, and the portion adjacent said coupling end and up to said diameter D
portion having an inner diameter equal to said pipe inner diameter d;
a flange projecting radially outwardly at said coupling end, so as to define a radial abutment surface to abut the corresponding surface of the other said coupling element;
one said coupling element having a male cylindrical projection beyond said abutment surface, with the inner diameter of said cylindrical projection being d, and the other said coupling element having a corresponding female cylindrical recess in the abutment surface thereof, to receive said male cylindrical projection in a close-tolerance fit, thereby acting to align said coupling elements.
2. A pipe coupling as recited in claim 1 where there is an abrupt transition between said diameter D and said diameter d portions inside said sleeve, thereby producing a radial shoulder against which said plastic pipe may be threaded.
3. A pipe coupling as recited in claim 1, where each said flange is provided with a plurality of axial bolt holes, and where said flanges are generally cylindrical, but have indicia at their outer circumferences such that alignment of said indicia produces alignment of said bolt holes.
4. A pipe coupling as recited in claim 1, where substantially all of said diameter D portion is internally threaded.
5. A pipe coupling as recited in claim 1, where there is an abrupt transition between said diameter D and said diameter d portions inside said sleeve, thereby producing a radial shoulder against which said plastic pipe may be threaded, where each said flange is provided with a plurality of axial bolt holes, where said flanges are generally cylindrical, but have indicia at their outer circumferences such that alignment of said indicia produces alignment of said bolt holes, and where substantially all of said diameter D
portion is internally threaded.
portion is internally threaded.
6. A pipe coupling as recited in claim 3, where said indicia comprises a flat axially-oriented surface portion at the circumference of each said flange.
7. A pipe coupling as recited in claim 4, where said indicia comprises a flat axially-oriented surface portion at the circumference of each said flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 602555 CA1325449C (en) | 1989-06-12 | 1989-06-12 | Pipe coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 602555 CA1325449C (en) | 1989-06-12 | 1989-06-12 | Pipe coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1325449C true CA1325449C (en) | 1993-12-21 |
Family
ID=4140196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 602555 Expired - Fee Related CA1325449C (en) | 1989-06-12 | 1989-06-12 | Pipe coupling |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1325449C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014158083A1 (en) * | 2013-03-26 | 2014-10-02 | Push & Win Ab | A guide member and a system for collecting items by means of said guide member |
| CN104963916A (en) * | 2015-06-23 | 2015-10-07 | 苏州柏德纳科技有限公司 | Flange ring connecting piece |
-
1989
- 1989-06-12 CA CA 602555 patent/CA1325449C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014158083A1 (en) * | 2013-03-26 | 2014-10-02 | Push & Win Ab | A guide member and a system for collecting items by means of said guide member |
| CN104963916A (en) * | 2015-06-23 | 2015-10-07 | 苏州柏德纳科技有限公司 | Flange ring connecting piece |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |