CA2411878A1 - Method of producing multiple pipe pieces with spigots from a single length of plastic pipe - Google Patents
Method of producing multiple pipe pieces with spigots from a single length of plastic pipe Download PDFInfo
- Publication number
- CA2411878A1 CA2411878A1 CA002411878A CA2411878A CA2411878A1 CA 2411878 A1 CA2411878 A1 CA 2411878A1 CA 002411878 A CA002411878 A CA 002411878A CA 2411878 A CA2411878 A CA 2411878A CA 2411878 A1 CA2411878 A1 CA 2411878A1
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- corrugations
- piece
- group
- pipe piece
- 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.)
- Abandoned
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
- F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
- F16L25/0036—Joints for corrugated pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
-
- 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
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/14—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics
- F16L11/15—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics corrugated
-
- 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
- F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
- F16L25/0036—Joints for corrugated pipes
- F16L25/0063—Joints for corrugated pipes with two corrugated pipes being directly connected to each other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/303—Extrusion nozzles or dies using dies or die parts movable in a closed circuit, e.g. mounted on movable endless support
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/18—Pleated or corrugated hoses
- B29L2023/183—Pleated or corrugated hoses partially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/18—Pleated or corrugated hoses
- B29L2023/186—Pleated or corrugated hoses having a smooth internal wall
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
A piece of corrugated pipe cut from a longer length of pipe is provided with a pipe coupling part by subjecting one or more of the corrugations on the pipe to heat and pressure collapsing the one or more corrugations to form a spigot on the piece of pipe.
Description
METHOD OF PRODUCING MULTIPLE PIPE PIECES WITH SPIGOTS
FROM A SINGLE LENGTH OF PLASTIC PIPE
FIELD OF THE INVENTION
The present invention relates to a method of providing spigots on a plurality of pipe pieces which are formed from a single length of plastic pipe.
BACKGROUND OF THE INVENTION
Corma Inc. of Toronto, Ontario, Canada has developed a process of extruding a single length of plastic pipe which can then be cut into first and second pipe sections. The first pipe section includes an open ended bell and the second pipe section includes a spigot formed by corrugations on the second pipe section and insertable into the bell of the first pipe section to provide a coupling for the two pipe sections.
It is often the case that the second pipe section may be overly long for its intended use resulting a further severing along the length of the second pipe section to shorten it to its desired length. This results in a further pipe piece which includes neither a coupling spigot nor a coupling bell. As such, this further pipe piece cannot be connected to other pipe pieces and becomes expensive waste material.
SUMMARY OF THE PRESENT INVENTION
The present invention relates to a method in which the previously considered waste pipe section referred to immediately above is converted to a useable piece of pipe provided with a spigot connectable to a piece of pipe having an open ended belled coupling part.
FROM A SINGLE LENGTH OF PLASTIC PIPE
FIELD OF THE INVENTION
The present invention relates to a method of providing spigots on a plurality of pipe pieces which are formed from a single length of plastic pipe.
BACKGROUND OF THE INVENTION
Corma Inc. of Toronto, Ontario, Canada has developed a process of extruding a single length of plastic pipe which can then be cut into first and second pipe sections. The first pipe section includes an open ended bell and the second pipe section includes a spigot formed by corrugations on the second pipe section and insertable into the bell of the first pipe section to provide a coupling for the two pipe sections.
It is often the case that the second pipe section may be overly long for its intended use resulting a further severing along the length of the second pipe section to shorten it to its desired length. This results in a further pipe piece which includes neither a coupling spigot nor a coupling bell. As such, this further pipe piece cannot be connected to other pipe pieces and becomes expensive waste material.
SUMMARY OF THE PRESENT INVENTION
The present invention relates to a method in which the previously considered waste pipe section referred to immediately above is converted to a useable piece of pipe provided with a spigot connectable to a piece of pipe having an open ended belled coupling part.
More particularly, the method of the present invention relates to the producing of first, second and third pipe pieces from a single length of pipe in which the second pipe piece is coupleable with the first pipe piece and the third pipe piece is coupleable with a further pipe piece corresponding to the first pipe piece.
The method comprises extruding a length of pipe with inner and outer pipe walls to form a first pipe region having a plurality of corrugations exteriorly of the first pipe region. Also formed is a second pipe region having first and second groups of corrugations exteriorly of the second pipe region. Further formed is closed bell between the first and second regions of the length of pipe.
The corrugations in the first pipe region, the bell and the corrugations in the second group of corrugations of the second pipe region are all consistent in height with one another and greater than the height of the shorter corrugations in the first group of corrugations in the second pipe region.
The method further includes severing the length of pipe at the bell to produce an open ended coupling part and also severing the length of the pipe between selected ones of the corrugations in the second group of corrugations of the second pipe region. This then provides first, second and third pipe pieces.
The shorter corrugations of the first group of corrugations are disposed or located on the second pipe piece and are insertable into the open ended coupling which is disposed or located on the first pipe piece.
Some of the corrugations of the second group of corrugations are also disposed on the second pipe piece with others of the corrugations of the second group of corrugations being disposed or located on the third pipe piece.
At least one of the corrugations on the third pipe piece is then collapsed to provide a deformed corrugation of a height consistent with that of the shorter corrugations of the first group of corrugations on the second pipe piece to then form a spigot on the third pipe piece. This spigot on the third pipe piece is also insertable into the open ended coupling part of the first pipe piece which means that it will also couple with a further pipe piece having an open ended coupling part corresponding to the coupling part of the first pipe piece. As a result the third pipe piece becomes useable in forming another coupled pipe rather than being waste material.
BRIEF DESCRIPTION OF THE DRAWINGS
The above as well as other advantages and features of the present invention will be described in greater detail according to the preferred embodiments of the present invention in which;
Figure 1 is a sectional view through the wall of a length of double wall pipe extruded according to a preferred embodiment of the present invention;
Figure 2 is an enlarged sectional view showing the pipe wall only part of the length of pipe of Figure 1 and with another part of the length of pipe being severed away according to a preferred method step of present invention;
Figure 3 is a sectional view of a coupled pipe wall made from wall parts shown in Figure 2 of the drawings;
Figure 4 is a sectional view of the pipe wall of the part of the length of pipe which is removed from the length of pipe of Figure 1 and not shown in Figure 2 of the drawings;
Figure 5 is a sectional view of pipe wall of a further pipe section having an opened ended coupling part the same as the open ended coupling part of the coupled pipe of Figure 3 sections shown in Figure 3 of the drawings;
Figure 6 is a sectional view of the pipe wall of the pipe section shown in Figure 4 during deformation of two of the corrugations in the pipe wall; and Figure 7 is a sectional view showing the coupling of the pipe sections of Figures 5 and 6 together with one another.
DETAILED DESCRIPTION ACCORDING TO THE PREFERRED
EMBODIMENTS OF THE PRESENT INVENTION IN WHICH:
Figure 1 shows the wall construction of an extruded length of plastic pipe generally indicated at 1.
This wall construction is formed by inner and outer layers of plastic to produce what is known in the industry as a double wall pipe with corrugations over a majority of the length of the pipe wall and including a belted region in the pipe wall.
More particularly, the length of pipe wall shown in Figure 1 includes a first wall region generally indicated at 3 including corrugations 5 exteriorly of the pipe wall and a second wall region generally indicated at 7 which includes corrugations 9, 11 and 13 along the wall region 7. A closed ended bell region 15 is provided between the first pipe region 3 and second pipe region 7.
All of the corrugations 5, 11 and 13 are identical in size and shape to one another. Furthermore, they have a height consistent with the height of the bell 15 in the pipe wall. The corrugations 9 on the other hand are shorter in height than any one of the corrugations 5, 11 and 13 and also shorter in height than the bell 15.
As noted above, all of the above described components of the pipe wall are extruded in a single extrusion process.
According to the present invention, the pipe wall is then severed into three pipe pieces including a first pipe piece generally indicated at 19 and a second pipe piece generally indicated at 21 shown in Figure 3 of the drawings. A third pipe piece generally indicated at 23 shown in Figure 4 of the drawings is also produced from the single length of pipe 1 shown in Figure 1.
Pipe piece 23 is generally obtained as a result of cutting pipe piece 21 from a length which is overly long for a particular use down to the desired length as such pipe piece 23 has, in the past been discarded as a piece of waste material.
The first and second pipe pieces 19 and 21 respectively are provided by cutting away part 17 of bell 15. This produces an open ended coupling part 23 on pipe piece 19. The first group of corrugations 9 on the second pipe piece 21 are insertable into the open ended coupling part 23 of the first pipe piece 19 as shown in Figure 3 to provide a coupling of the first and second pipe pieces.
In many instances and as earlier described, the second pipe region generally indicated at 7 in Figure 1 of the drawings may be overly long for a desired length of pipe. Accordingly pipe regions 7 is cut between selected ones of the second group of taller corrugations on this pipe region as indicated by the cut 12 in pipe region 7. This produces a separation between the second and third pipe pieces. The corrugations 11 remain on the second pipe piece 21 found in Figure 3 of the drawings while the corrugations 13 are disposed or located on the third pipe piece 24 shown in Figure 4 of the drawings.
In its Figure 4 condition, pipe piece 24 does not include anything in the way of a spigot which could be coupled with either pipe piece 19 or any correspondingly shaped pipe piece such as pipe piece 25 shown in Figure 5 of the drawings. This is because the height of the corrugations 13 on the pipe piece 24 shown in Figure 4 of the drawings is the same as the height of the open ended coupling part 23 of pipe piece 19 and the open ended coupling part 27 of pipe piece 25 shown in Figure 5 of the drawings. Accordingly, the corrugations 13 of the pipe piece 24 in the Figure condition will not insert into either of the open ended coupling parts 23 or 27 of the pipe pieces 19 and 25 respectively. As such, pipe piece 24 in its Figure 4 state becomes a piece of pipe wastage.
In accordance with the present invention pipe piece 24 shown in Figure 4 of the drawings is converted to a usable piece of pipe including a spigot which is insertable within the open ended coupling part 23 of pipe piece 19 or any other similar shaped open ended coupling part as for example, coupling part 27 on pipe piece 25 in Figure 5 of the drawings. This is accomplished by deforming at least one of the corrugations 13 on pipe piece 24 so as to collapse the deformed corrugation to a height consistent with the corrugations 9 on pipe piece 21 shown in Figure 3 of the drawings.
A particular corrugation deformation method is shown in Figure 6 of the drawings in which two of the corrugations on pipe piece 24 are heated in a heating chamber 31 to soften the plastic material in the two corrugations. This occurs after the initial extrusion of the entire length of pipe in which molten plastic is used to form the inner and outer pipe walls and that molten plastic is then cooled to set the shape of the pipe walls and in particular, the shape and size of the corrugations and bell region along the outside of the pipe wall.
In Figure 6, the two corrugations on the pipe piece 24 which are exposed to heat and mechanical pressure by pushers 33 are collapsed to provide deformed corrugations 13a and 13b. Following deformation these two corrugations are then allowed to once again cool to hold their deformed shape. In this deformed shape, each of the corrugations 13a and 13b has a center recess 14a and 14b respectively to receive an 0-ring as shown in Figure 7 of the drawings. As is also shown in Figure 7 of the drawings the deformed corrugations 13a and 13b provided with their O-rings are insertable into the open ended coupling part 27 of pipe piece 25 which as earlier described corresponds to the open ended coupling part of pipe piece 19. This then provides a sealed coupling between pipe pieces 24 and 25 in the same way as pipe piece 21 couples with pipe piece 19.
_ g _ It should be noted that the two deformed corrugations 13a and 13b are formed from corrugations which are overall larger than the spigot forming corrugations 9 on pipe piece 21. Accordingly, each of the deformed corrugations 13a and 13b is longer than each of the spigot forming corrugations 9. As such, fewer of the deformed corrugations may be required to provide the same length of spigot as that provided by the preformed corrugations 9.
As will be apparent from a review of Figures 5 through 7 of the drawings when the two pipe pieces 24 and 25 are coupled with one another there is produced an overall length of pipe having an outside diameter which is consistent over the length of that pipe. This is because the corrugations 13 on the pipe piece 24 are elevated to the same height as the open ended coupling part 27 and the corrugations 29 of the further pipe piece 25. Coupling part 27 and corrugations 29 of pipe piece 25 are also at the same height as the open ended coupling part 23 and the corrugations 5 on the first coupling piece 19 shown in Figure 3 of the drawings.
It will now be seen from the above description how a piece of pipe which was previously nothing but pipe wastage becomes, in accordance with the present invention a useful piece of pipe connectable with other another piece of pipe.
Although various preferred embodiments of the present invention have been described in detail, it will be appreciated by those skilled in the art that variations may be made without departing from the spirit of the invention or the scope of the appended claims.
The method comprises extruding a length of pipe with inner and outer pipe walls to form a first pipe region having a plurality of corrugations exteriorly of the first pipe region. Also formed is a second pipe region having first and second groups of corrugations exteriorly of the second pipe region. Further formed is closed bell between the first and second regions of the length of pipe.
The corrugations in the first pipe region, the bell and the corrugations in the second group of corrugations of the second pipe region are all consistent in height with one another and greater than the height of the shorter corrugations in the first group of corrugations in the second pipe region.
The method further includes severing the length of pipe at the bell to produce an open ended coupling part and also severing the length of the pipe between selected ones of the corrugations in the second group of corrugations of the second pipe region. This then provides first, second and third pipe pieces.
The shorter corrugations of the first group of corrugations are disposed or located on the second pipe piece and are insertable into the open ended coupling which is disposed or located on the first pipe piece.
Some of the corrugations of the second group of corrugations are also disposed on the second pipe piece with others of the corrugations of the second group of corrugations being disposed or located on the third pipe piece.
At least one of the corrugations on the third pipe piece is then collapsed to provide a deformed corrugation of a height consistent with that of the shorter corrugations of the first group of corrugations on the second pipe piece to then form a spigot on the third pipe piece. This spigot on the third pipe piece is also insertable into the open ended coupling part of the first pipe piece which means that it will also couple with a further pipe piece having an open ended coupling part corresponding to the coupling part of the first pipe piece. As a result the third pipe piece becomes useable in forming another coupled pipe rather than being waste material.
BRIEF DESCRIPTION OF THE DRAWINGS
The above as well as other advantages and features of the present invention will be described in greater detail according to the preferred embodiments of the present invention in which;
Figure 1 is a sectional view through the wall of a length of double wall pipe extruded according to a preferred embodiment of the present invention;
Figure 2 is an enlarged sectional view showing the pipe wall only part of the length of pipe of Figure 1 and with another part of the length of pipe being severed away according to a preferred method step of present invention;
Figure 3 is a sectional view of a coupled pipe wall made from wall parts shown in Figure 2 of the drawings;
Figure 4 is a sectional view of the pipe wall of the part of the length of pipe which is removed from the length of pipe of Figure 1 and not shown in Figure 2 of the drawings;
Figure 5 is a sectional view of pipe wall of a further pipe section having an opened ended coupling part the same as the open ended coupling part of the coupled pipe of Figure 3 sections shown in Figure 3 of the drawings;
Figure 6 is a sectional view of the pipe wall of the pipe section shown in Figure 4 during deformation of two of the corrugations in the pipe wall; and Figure 7 is a sectional view showing the coupling of the pipe sections of Figures 5 and 6 together with one another.
DETAILED DESCRIPTION ACCORDING TO THE PREFERRED
EMBODIMENTS OF THE PRESENT INVENTION IN WHICH:
Figure 1 shows the wall construction of an extruded length of plastic pipe generally indicated at 1.
This wall construction is formed by inner and outer layers of plastic to produce what is known in the industry as a double wall pipe with corrugations over a majority of the length of the pipe wall and including a belted region in the pipe wall.
More particularly, the length of pipe wall shown in Figure 1 includes a first wall region generally indicated at 3 including corrugations 5 exteriorly of the pipe wall and a second wall region generally indicated at 7 which includes corrugations 9, 11 and 13 along the wall region 7. A closed ended bell region 15 is provided between the first pipe region 3 and second pipe region 7.
All of the corrugations 5, 11 and 13 are identical in size and shape to one another. Furthermore, they have a height consistent with the height of the bell 15 in the pipe wall. The corrugations 9 on the other hand are shorter in height than any one of the corrugations 5, 11 and 13 and also shorter in height than the bell 15.
As noted above, all of the above described components of the pipe wall are extruded in a single extrusion process.
According to the present invention, the pipe wall is then severed into three pipe pieces including a first pipe piece generally indicated at 19 and a second pipe piece generally indicated at 21 shown in Figure 3 of the drawings. A third pipe piece generally indicated at 23 shown in Figure 4 of the drawings is also produced from the single length of pipe 1 shown in Figure 1.
Pipe piece 23 is generally obtained as a result of cutting pipe piece 21 from a length which is overly long for a particular use down to the desired length as such pipe piece 23 has, in the past been discarded as a piece of waste material.
The first and second pipe pieces 19 and 21 respectively are provided by cutting away part 17 of bell 15. This produces an open ended coupling part 23 on pipe piece 19. The first group of corrugations 9 on the second pipe piece 21 are insertable into the open ended coupling part 23 of the first pipe piece 19 as shown in Figure 3 to provide a coupling of the first and second pipe pieces.
In many instances and as earlier described, the second pipe region generally indicated at 7 in Figure 1 of the drawings may be overly long for a desired length of pipe. Accordingly pipe regions 7 is cut between selected ones of the second group of taller corrugations on this pipe region as indicated by the cut 12 in pipe region 7. This produces a separation between the second and third pipe pieces. The corrugations 11 remain on the second pipe piece 21 found in Figure 3 of the drawings while the corrugations 13 are disposed or located on the third pipe piece 24 shown in Figure 4 of the drawings.
In its Figure 4 condition, pipe piece 24 does not include anything in the way of a spigot which could be coupled with either pipe piece 19 or any correspondingly shaped pipe piece such as pipe piece 25 shown in Figure 5 of the drawings. This is because the height of the corrugations 13 on the pipe piece 24 shown in Figure 4 of the drawings is the same as the height of the open ended coupling part 23 of pipe piece 19 and the open ended coupling part 27 of pipe piece 25 shown in Figure 5 of the drawings. Accordingly, the corrugations 13 of the pipe piece 24 in the Figure condition will not insert into either of the open ended coupling parts 23 or 27 of the pipe pieces 19 and 25 respectively. As such, pipe piece 24 in its Figure 4 state becomes a piece of pipe wastage.
In accordance with the present invention pipe piece 24 shown in Figure 4 of the drawings is converted to a usable piece of pipe including a spigot which is insertable within the open ended coupling part 23 of pipe piece 19 or any other similar shaped open ended coupling part as for example, coupling part 27 on pipe piece 25 in Figure 5 of the drawings. This is accomplished by deforming at least one of the corrugations 13 on pipe piece 24 so as to collapse the deformed corrugation to a height consistent with the corrugations 9 on pipe piece 21 shown in Figure 3 of the drawings.
A particular corrugation deformation method is shown in Figure 6 of the drawings in which two of the corrugations on pipe piece 24 are heated in a heating chamber 31 to soften the plastic material in the two corrugations. This occurs after the initial extrusion of the entire length of pipe in which molten plastic is used to form the inner and outer pipe walls and that molten plastic is then cooled to set the shape of the pipe walls and in particular, the shape and size of the corrugations and bell region along the outside of the pipe wall.
In Figure 6, the two corrugations on the pipe piece 24 which are exposed to heat and mechanical pressure by pushers 33 are collapsed to provide deformed corrugations 13a and 13b. Following deformation these two corrugations are then allowed to once again cool to hold their deformed shape. In this deformed shape, each of the corrugations 13a and 13b has a center recess 14a and 14b respectively to receive an 0-ring as shown in Figure 7 of the drawings. As is also shown in Figure 7 of the drawings the deformed corrugations 13a and 13b provided with their O-rings are insertable into the open ended coupling part 27 of pipe piece 25 which as earlier described corresponds to the open ended coupling part of pipe piece 19. This then provides a sealed coupling between pipe pieces 24 and 25 in the same way as pipe piece 21 couples with pipe piece 19.
_ g _ It should be noted that the two deformed corrugations 13a and 13b are formed from corrugations which are overall larger than the spigot forming corrugations 9 on pipe piece 21. Accordingly, each of the deformed corrugations 13a and 13b is longer than each of the spigot forming corrugations 9. As such, fewer of the deformed corrugations may be required to provide the same length of spigot as that provided by the preformed corrugations 9.
As will be apparent from a review of Figures 5 through 7 of the drawings when the two pipe pieces 24 and 25 are coupled with one another there is produced an overall length of pipe having an outside diameter which is consistent over the length of that pipe. This is because the corrugations 13 on the pipe piece 24 are elevated to the same height as the open ended coupling part 27 and the corrugations 29 of the further pipe piece 25. Coupling part 27 and corrugations 29 of pipe piece 25 are also at the same height as the open ended coupling part 23 and the corrugations 5 on the first coupling piece 19 shown in Figure 3 of the drawings.
It will now be seen from the above description how a piece of pipe which was previously nothing but pipe wastage becomes, in accordance with the present invention a useful piece of pipe connectable with other another piece of pipe.
Although various preferred embodiments of the present invention have been described in detail, it will be appreciated by those skilled in the art that variations may be made without departing from the spirit of the invention or the scope of the appended claims.
Claims (6)
1. A length of double wall plastic pipe which is severed to produce first, second and third pipe pieces, said first pipe piece having corrugations and an open ended bell exteriorly thereof, said second pipe piece having a first group of corrugations and a second group of corrugations exteriorly thereof, the corrugations in the first group being consistent in height with the corrugations and the bell on the first pipe piece and the corrugations in the second group being of a height which is less than that of the corrugations in the first group to form a spigot on the second piece fittable into the bell of the first pipe piece, the third pipe piece having a plurality of corrugations exteriorly thereof, said corrugations on said third pipe piece comprising first corrugations corresponding to the corrugations on the first pipe piece and at least one corrugation which is deformed from a shape corresponding to the first corrugations on the third pipe piece to a shape having a height corresponding to the height of the corrugations in the second group of corrugations on the second pipe piece to form a spigot on the third pipe piece which is fittable into another bell which is provided on another pipe piece and which corresponds to the bell of the first pipe piece.
2. A length of plastic pipe as claimed in Claim 1 wherein the at least deformed corrugation has a length greater than length of the corrugations in the second group of corrugations on the second pipe piece and includes a central O-ring fitting depression.
3. A method of producing first, second and third coupleable pipe pieces from a single length of pipe, said method comprising extruding said length of pipe with inner and outer pipe walls to form a first pipe region having a plurality of corrugations exteriorly thereof, a second pipe region having a first group and a second group of corrugations exteriorly thereof and a closed bell between the first and second regions of the length of the pipe, the corrugations in the first pipe region, the bell and the corrugations in the second group of corrugations of the second pipe region all being of a consistent height greater than height of the corrugations in the first group of corrugations in the second pipe region, and then severing the length of pipe at the bell and between selected ones of the corrugations in the second group of corrugations of the second pipe region to provide the first, second and third pipe pieces with the first pipe piece including an open ended coupling part, the corrugations of the first group of corrugations being disposed on the second pipe piece and being insertable into the open ended coupling part disposed on the first pipe piece and some of the corrugations of the second group of corrugations also being disposed on the second pipe piece, other ones of the corrugations of the second group of corrugations being disposed on the third pipe piece, at least one of the other ones of the corrugations being collapsed to provide a deformed corrugation of a height consistent with that of the corrugations of the first group of corrugations to form a spigot on the third pipe piece which is also insertable into an open ended coupling part of a further pipe piece which corresponds to the coupling part of the first pipe piece.
4. A method as claimed in Claim 3 wherein the single length of pipe is made from molten plastic which is then cooled to harden to shape of the length of pipe, the deformed corrugation on the third pipe piece being reheated often hardening of the length of pipe to soften the deformed corrugation which is then subjected to external pressure for collapsing of the deformed corrugation.
5. A method as claimed in Claim 4 wherein the external pressure is provided by mechanical member which pushes on said deformed corrugation.
6. A method as claimed in Claim 5 wherein the mechanical pusher pushes centrally on the deformed corrugation to both collapse and to produce an O-ring seat in said deformed corrugation.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002411878A CA2411878A1 (en) | 2002-11-15 | 2002-11-15 | Method of producing multiple pipe pieces with spigots from a single length of plastic pipe |
| CNA031037534A CN1500624A (en) | 2002-11-15 | 2003-02-18 | Method of producing multiple pipe pieces with spigots from a single length of plastic pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002411878A CA2411878A1 (en) | 2002-11-15 | 2002-11-15 | Method of producing multiple pipe pieces with spigots from a single length of plastic pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2411878A1 true CA2411878A1 (en) | 2004-05-15 |
Family
ID=32399893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002411878A Abandoned CA2411878A1 (en) | 2002-11-15 | 2002-11-15 | Method of producing multiple pipe pieces with spigots from a single length of plastic pipe |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1500624A (en) |
| CA (1) | CA2411878A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3268650A4 (en) * | 2015-03-11 | 2018-11-21 | Manfred Arno Alfred Lupke | Two stage coupling for corrugated pipe |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2872849A1 (en) * | 2014-11-28 | 2016-05-28 | Manfred A. A. Lupke | Method for forming inline triple wall coupling connector |
-
2002
- 2002-11-15 CA CA002411878A patent/CA2411878A1/en not_active Abandoned
-
2003
- 2003-02-18 CN CNA031037534A patent/CN1500624A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3268650A4 (en) * | 2015-03-11 | 2018-11-21 | Manfred Arno Alfred Lupke | Two stage coupling for corrugated pipe |
| US11156316B2 (en) | 2015-03-11 | 2021-10-26 | Manfred A. A. Lupke | Pipe coupling |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1500624A (en) | 2004-06-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20100032046A1 (en) | Method of forming corrugated pipe with a pipe spigot seal seat | |
| US5833279A (en) | Crosslinked polyethylene tubing ends | |
| US4783303A (en) | Method of processing semifinished products made of cross-linked plastic material | |
| EP1133655A1 (en) | Pipe coupling having same outer diameter as pipe | |
| JP2009063173A (en) | Method and device for manufacturing coated compression pipe component | |
| AU660073B2 (en) | A method and an apparatus for the orientation of a plastic pipe and an oriented ribbed plastic pipe produced by the method | |
| US11034073B2 (en) | Method for forming inline triple wall coupling connector | |
| CA2411878A1 (en) | Method of producing multiple pipe pieces with spigots from a single length of plastic pipe | |
| CA2147481C (en) | Process of manufacturing formed parts made of hot-formable plastics | |
| JP5574141B2 (en) | Bellows made of polytetrafluoroethylene, method for producing the same, device for producing the same, and fluid pumping device using the same | |
| US3923952A (en) | Method for shaping a normally rigid plastic pipe | |
| PT1112170E (en) | METHOD FOR MANUFACTURING PRESSURE COMPOSITIONS AND PRODUCTS MANUFACTURED BY THAT PROCESS | |
| CA1179810A (en) | Method of forming a wraparound closure | |
| EP0081883A2 (en) | A method and apparatus for moulding a socket to a plastic tube | |
| JPS58193122A (en) | Preparation of thermally shrinkable plastic sleeve | |
| CN1114931A (en) | Method and apparatus for producing a plastic pipe and a plastic pipe | |
| EP1419873B1 (en) | Method for manufacturing rotation symmetrical objects made of polymeric material | |
| EP0362919A2 (en) | Extruded radially stretched plastic pipe and procedure for manufacturing such a pipe | |
| SU1764744A1 (en) | Method of making ball joints | |
| KR100385492B1 (en) | Method of manufacturing a pipe connecting socket | |
| JPS62104743A (en) | Manufacture of corrugated pipe equipped with sleeve | |
| JPH01184117A (en) | Preparation of plastic container | |
| JPS6369621A (en) | Blockading of through hole of resin tube, provided with axial through holes in pipe wall in parallel | |
| JPH08207133A (en) | Production of resin bent pipe | |
| JPH03203613A (en) | Preparation of tube-like foamed rubber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |