CA1068211A - Method and device for manufacturing perforated plastic pipes - Google Patents
Method and device for manufacturing perforated plastic pipesInfo
- Publication number
- CA1068211A CA1068211A CA266,043A CA266043A CA1068211A CA 1068211 A CA1068211 A CA 1068211A CA 266043 A CA266043 A CA 266043A CA 1068211 A CA1068211 A CA 1068211A
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- punch
- punch member
- plastic pipe
- conveyance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/0015—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor specially adapted for perforating tubes
- B26F1/0061—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor specially adapted for perforating tubes whereby the tube moves axially or radially
- B26F1/0069—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor specially adapted for perforating tubes whereby the tube moves axially or radially and the tool travels with the tube
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method for manufacturing perforated plastic pipe, in particular corrugated thermoplastic pipe which are perforated by at least one punching member. A movement is imparted to the punch members in the direction of conveyance of the plastic pipe, which equals the rate of conveyance of the pipe. During the punching operation the punching member or members retain a substantially perpendicular position with respect to the plastic pipe.
A method for manufacturing perforated plastic pipe, in particular corrugated thermoplastic pipe which are perforated by at least one punching member. A movement is imparted to the punch members in the direction of conveyance of the plastic pipe, which equals the rate of conveyance of the pipe. During the punching operation the punching member or members retain a substantially perpendicular position with respect to the plastic pipe.
Description
8'~
The invention relates to an improved method for manufacturing perforated pipes particularly corrugated thermo-plastic pipe with perforated wave valleys by conveying a plastic pipe continuously through a perforation zone and perforating the pipe due to the action of at least one movable punch member.
According to known methods plastic pipes are passed through a hollow guide, punching means being pressed, by means of a cam disc, into or through the wall of the plas~ic pipes at selected times, forming the desired openings.
As long as the perforating operation is carried out at a rather low rate of pipe transportation the suitable elastic prop-erties of the material used for the punches can be selected so that during their engagement with the plastic pipes they are capable of bending or deflecting so that they can be removed from the plastic pipes later on without fracture or breakage.
A disadvantage is, however, that the punches which are mounted only for radial movement contact pipes which are being conveyed in a direction perpendicular thereto.
To increase the conveyance rates of plastic pipes is clearly advantageous as extruders manufacturing plastic pipes can at present operate at considerably faster rates. Hence the problem occurs that on the one hand punches acting upon plastic pipes are caused to bulge or bend, which gives rise to undesired fractures of the punches and to disturbances in the production process, while on the other hand the punches can be easily dam-aged by the forces produced when plastic pipes and punch contact each other.
The invention provides a method which overcomes the aforementioned disadvantages.
The solution is attained according to the invention by the arrangement that at least during the time of engagement with the plastic pipes, a movement in the direction of conveyance is im-parted to a punch member which equals the rate o~ conveyance of --1-- ' 10~i8Zll the plastic pipes and that during their penetrating action the punches retain substantially a perpendicular position with res-pect to the plastic pipes.
It is thus possible to operate at much faster rates since the speed of movement of the punches enables an operating structure which can stand considerable bulging without fracture.
When the punches are moving in the direction of convey-ance of the plastic pipes they can moreover be conveyed very quickly without having to adapt their properties to these much faster rates of conveyance, which may surpass twice or three times the speed which is possible with known devices.
The punch member is conveniently moved reciprocally towards and away from the pipes by means of a punch holder mounted on two eccentrics, the movement of the punch member being related to the rate of conveyance of the pipes.
During the entire length of engagement of the punch with the plastic pipes the punch should be conveyed in the di-rection of conveyance of the pipe at a rate which is identical to the rate of conveyance of the plastic pipes. In this manner deformation of the punches as a result of engagement with the plastic pipes is completely avoided.
Finally it is advisable to convey a punch at a rate in the direction of conveyance of the plastic pipes which equals the rate of conveyance of the plastic pipes in the area in which ~- the punch is retracted from its position of engagement with the plastic pipes. In this way a binding or deformation of the punch is avoided during its removal from the plastic pipes. -The invention also relates to an imposed device for ~ continuously perforating pla~tic pipes, particularly corrugated ;~ 30 pIastic pipe, comprising a guide member for the plastic pipe, a pipe conveying member for the transportation of the plastic pipe, a punching~l~member for punching holes in the plastic pipe and an ~ operating member for causing the punching member to perforate .
10~i8;211 the plastic pipe.
Such devices are generally known and have the afore-mentioned disadvantages.
In order to obviate these difficulties and in particular to provide a device which lends itself well for perforating plas-tic pipe when much faster rates of conveyance of the pipe are used, the device is provided with punch member actuators for causing the punch members to move with the same speed as the pipe conveying members at least when the punch members act upon the pipes to be perforated, and in order to preserve a substan-tially perpendicular position with respect to the conveyed pipes when the punching members are in contact therewith.
Thus, the rate of conveyance of plastic pipes can be considerably increased without the risk of fracture or distortion, of the punching members and without the necessity of adapting the bending properties thereof.
In a particularly convenient fashion the punch member actuators for causing the punch members to move with the same velocity as the pipe conveying members (at least when the punch-ing members are acting upon the pipe to perforate same) consist of a first eccentric member.
The device is efficiently provided with a punching member disposed on a punching member holder being connected with two eccentrics which can be actuated by one driving mechanism, while the first eccentric member acts upon the two eccentrics.
Very good results are obtained by means of this device 1 .
~-~ since it operates very uniformly during the perforation operation, <~ even when the pipes to be perforated are moving at very fast rates.
The invention will now be further described with ref-erence to the accompanying drawings which illustrate apparatus for performing the method according to the invention, and wherein:
Figure 1 shows a front view of a device for continuous-- 1068Zl~
ly perforating plastic pipes; and Figure 2 is a side elevation of the device shown in Figure 1.
The drawings show a device for continuously perforating the wave valleys of plastic pipes, particularly corrugated thermo-plastic pipes such as polyvinylchloride. The device has a frame 1 with a drive motor 2 driving drive gear 3 through an inter- --mediate shaft. This driving gear 3 drives gear wheels 22 and 23 which are connected with the eccentric discs 28 and 27 respect-ively. During rotation of the driving gear wheel 3 and the gear wheels 22 and 23 (the gear wheels rotating all at the same speed) the eccentric shafts 19 and 20 of the eccentric discs 27 and 28 move according to the arrows 24 and 26, whereby a downward move-ment is imparted to the driving rods 15 and 16.
The driving rods 15 and 16 are pivotally connected through pivots 18 and 17 to connecting beam 12 in which is pro-vided an elongate slot 13. In this elongate slot 13 is secured by a screw 14, a supporting beam 8, carrying pairs of punches 9, - 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h, 9i, 9j, and 9k, so that, when the driving rods move downwardly the punches 9, 9a, etc. also move downwardly.
A conveying wheel 10 is mounted for conveying a corru-gated plastic pipe 30, which pipe may be surrounded by an en-velope 11 with an opening 29 through which the punches can act.
~t: The envelope 11 may be channel-shaped or consist of strips be-¦~ -tween which are open areas.
When the eccentrics are caused to act in this way upon the punches, it is necessary to use complicated mechanisms in order to adapt the rate of conveyance of the plastic pipe to the velocity of the punches 9 which vçlocity is defined by the eccen-tric shafts 15 and 16. It is, however, almost impossible in prac-l tice to precisely control the speed of pipe movement.
J- So as to overcome this difficulty applicant provides J
106~2~
a first eccentric mechanism, consisting of a cam 5 having an ecc-entric circumference 31, mounted on a shaft 6, the latter being connected with a cam drive gear wheel 4 which cooperates with drive gear wheel 3.
A cam roller 32, secured to an eccentric disc 28 by rod 33 continuously cooperates with the circumference 31 of the cam 5, due to the action of spring 34 cooperating with a saddle member 25 provided on eccentric disc 28 and with a saddle member 21 provided on eccentric disc 27.
The cam 5 rotates with the same speed as the eccentric discs 27 and 28 owing to an active drive gear wheel 3. When the circumference of the cam disc 5 and the speed of rotation thereof are suitably selected the punches 9, 9a, etc. are moved with the same velocity as the plastic pipes 30 during the perforating action.
During rotation of the cam 5 and due to the eccentric circumference thereof, the eccentric driving rod 15 will not only be subjected to a movement of the eccentric shaft 20 but also be influenced by the cam 5, and as a result of spring 34 driving rod 16 undergoes the same movement as driving rod 15. This means that the supporting beam 8 together with the punches on account of its fixed connection with the connecting rod 12 not only undergoes a downwardly directed movement in order to cause the punches to penetrate the pipe 30, but also a reciprocal backward-forward movement, respectively, to keep the linear velocity of the supporting beam 8 uniform in spite of the usual non-uniform velocity of the supporting beam 8 caused by the eccentrics.
Should it be desired to impart an additional left-ward directed movement to the punches 9 in a device according to ::
the invention, this can be effected by increasing the diameter of the cam 5 at the location of the cam roller 32; when the diameter of the cam 5 is decreased, movement of the punches more to the right is achieved.
` 10~8Zll The motor 2 normally drives both drive gear wheel 3 and conveyor wheel 10 for moving punches 9 and pipes 30 at an identical rate.
In the drawing twelve pairs of opposite punches 9, 9', etc. disposed on a supporting beam 8, are shown.
Although these punches 9, 9a, 9b could all simultan-eously contact plastic pipe 30, it is advisable to perform perforation in sequential manner. For that purpose the lengths of the punches differ, so that first the longest pairs of punches 9d, 9e, 9j and 9k contact the plastic pipe and subsequently pairs of punches 9b, 9c, 9h and 9i, whereafter the remaining pairs of punches follow.
The pairs of punches 9, 9', etc., are disposed in planes which may assume a position perpendicular to the axis of envelope 11, their lateral spacing being selected, of course, such that the punches contact the pipe 30.
When the pipes have a substantially helical profile then the pairs of punches are arranged in such a way that they perforate in two consecutive wave valleys.
; 6 , . . .
The invention relates to an improved method for manufacturing perforated pipes particularly corrugated thermo-plastic pipe with perforated wave valleys by conveying a plastic pipe continuously through a perforation zone and perforating the pipe due to the action of at least one movable punch member.
According to known methods plastic pipes are passed through a hollow guide, punching means being pressed, by means of a cam disc, into or through the wall of the plas~ic pipes at selected times, forming the desired openings.
As long as the perforating operation is carried out at a rather low rate of pipe transportation the suitable elastic prop-erties of the material used for the punches can be selected so that during their engagement with the plastic pipes they are capable of bending or deflecting so that they can be removed from the plastic pipes later on without fracture or breakage.
A disadvantage is, however, that the punches which are mounted only for radial movement contact pipes which are being conveyed in a direction perpendicular thereto.
To increase the conveyance rates of plastic pipes is clearly advantageous as extruders manufacturing plastic pipes can at present operate at considerably faster rates. Hence the problem occurs that on the one hand punches acting upon plastic pipes are caused to bulge or bend, which gives rise to undesired fractures of the punches and to disturbances in the production process, while on the other hand the punches can be easily dam-aged by the forces produced when plastic pipes and punch contact each other.
The invention provides a method which overcomes the aforementioned disadvantages.
The solution is attained according to the invention by the arrangement that at least during the time of engagement with the plastic pipes, a movement in the direction of conveyance is im-parted to a punch member which equals the rate o~ conveyance of --1-- ' 10~i8Zll the plastic pipes and that during their penetrating action the punches retain substantially a perpendicular position with res-pect to the plastic pipes.
It is thus possible to operate at much faster rates since the speed of movement of the punches enables an operating structure which can stand considerable bulging without fracture.
When the punches are moving in the direction of convey-ance of the plastic pipes they can moreover be conveyed very quickly without having to adapt their properties to these much faster rates of conveyance, which may surpass twice or three times the speed which is possible with known devices.
The punch member is conveniently moved reciprocally towards and away from the pipes by means of a punch holder mounted on two eccentrics, the movement of the punch member being related to the rate of conveyance of the pipes.
During the entire length of engagement of the punch with the plastic pipes the punch should be conveyed in the di-rection of conveyance of the pipe at a rate which is identical to the rate of conveyance of the plastic pipes. In this manner deformation of the punches as a result of engagement with the plastic pipes is completely avoided.
Finally it is advisable to convey a punch at a rate in the direction of conveyance of the plastic pipes which equals the rate of conveyance of the plastic pipes in the area in which ~- the punch is retracted from its position of engagement with the plastic pipes. In this way a binding or deformation of the punch is avoided during its removal from the plastic pipes. -The invention also relates to an imposed device for ~ continuously perforating pla~tic pipes, particularly corrugated ;~ 30 pIastic pipe, comprising a guide member for the plastic pipe, a pipe conveying member for the transportation of the plastic pipe, a punching~l~member for punching holes in the plastic pipe and an ~ operating member for causing the punching member to perforate .
10~i8;211 the plastic pipe.
Such devices are generally known and have the afore-mentioned disadvantages.
In order to obviate these difficulties and in particular to provide a device which lends itself well for perforating plas-tic pipe when much faster rates of conveyance of the pipe are used, the device is provided with punch member actuators for causing the punch members to move with the same speed as the pipe conveying members at least when the punch members act upon the pipes to be perforated, and in order to preserve a substan-tially perpendicular position with respect to the conveyed pipes when the punching members are in contact therewith.
Thus, the rate of conveyance of plastic pipes can be considerably increased without the risk of fracture or distortion, of the punching members and without the necessity of adapting the bending properties thereof.
In a particularly convenient fashion the punch member actuators for causing the punch members to move with the same velocity as the pipe conveying members (at least when the punch-ing members are acting upon the pipe to perforate same) consist of a first eccentric member.
The device is efficiently provided with a punching member disposed on a punching member holder being connected with two eccentrics which can be actuated by one driving mechanism, while the first eccentric member acts upon the two eccentrics.
Very good results are obtained by means of this device 1 .
~-~ since it operates very uniformly during the perforation operation, <~ even when the pipes to be perforated are moving at very fast rates.
The invention will now be further described with ref-erence to the accompanying drawings which illustrate apparatus for performing the method according to the invention, and wherein:
Figure 1 shows a front view of a device for continuous-- 1068Zl~
ly perforating plastic pipes; and Figure 2 is a side elevation of the device shown in Figure 1.
The drawings show a device for continuously perforating the wave valleys of plastic pipes, particularly corrugated thermo-plastic pipes such as polyvinylchloride. The device has a frame 1 with a drive motor 2 driving drive gear 3 through an inter- --mediate shaft. This driving gear 3 drives gear wheels 22 and 23 which are connected with the eccentric discs 28 and 27 respect-ively. During rotation of the driving gear wheel 3 and the gear wheels 22 and 23 (the gear wheels rotating all at the same speed) the eccentric shafts 19 and 20 of the eccentric discs 27 and 28 move according to the arrows 24 and 26, whereby a downward move-ment is imparted to the driving rods 15 and 16.
The driving rods 15 and 16 are pivotally connected through pivots 18 and 17 to connecting beam 12 in which is pro-vided an elongate slot 13. In this elongate slot 13 is secured by a screw 14, a supporting beam 8, carrying pairs of punches 9, - 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h, 9i, 9j, and 9k, so that, when the driving rods move downwardly the punches 9, 9a, etc. also move downwardly.
A conveying wheel 10 is mounted for conveying a corru-gated plastic pipe 30, which pipe may be surrounded by an en-velope 11 with an opening 29 through which the punches can act.
~t: The envelope 11 may be channel-shaped or consist of strips be-¦~ -tween which are open areas.
When the eccentrics are caused to act in this way upon the punches, it is necessary to use complicated mechanisms in order to adapt the rate of conveyance of the plastic pipe to the velocity of the punches 9 which vçlocity is defined by the eccen-tric shafts 15 and 16. It is, however, almost impossible in prac-l tice to precisely control the speed of pipe movement.
J- So as to overcome this difficulty applicant provides J
106~2~
a first eccentric mechanism, consisting of a cam 5 having an ecc-entric circumference 31, mounted on a shaft 6, the latter being connected with a cam drive gear wheel 4 which cooperates with drive gear wheel 3.
A cam roller 32, secured to an eccentric disc 28 by rod 33 continuously cooperates with the circumference 31 of the cam 5, due to the action of spring 34 cooperating with a saddle member 25 provided on eccentric disc 28 and with a saddle member 21 provided on eccentric disc 27.
The cam 5 rotates with the same speed as the eccentric discs 27 and 28 owing to an active drive gear wheel 3. When the circumference of the cam disc 5 and the speed of rotation thereof are suitably selected the punches 9, 9a, etc. are moved with the same velocity as the plastic pipes 30 during the perforating action.
During rotation of the cam 5 and due to the eccentric circumference thereof, the eccentric driving rod 15 will not only be subjected to a movement of the eccentric shaft 20 but also be influenced by the cam 5, and as a result of spring 34 driving rod 16 undergoes the same movement as driving rod 15. This means that the supporting beam 8 together with the punches on account of its fixed connection with the connecting rod 12 not only undergoes a downwardly directed movement in order to cause the punches to penetrate the pipe 30, but also a reciprocal backward-forward movement, respectively, to keep the linear velocity of the supporting beam 8 uniform in spite of the usual non-uniform velocity of the supporting beam 8 caused by the eccentrics.
Should it be desired to impart an additional left-ward directed movement to the punches 9 in a device according to ::
the invention, this can be effected by increasing the diameter of the cam 5 at the location of the cam roller 32; when the diameter of the cam 5 is decreased, movement of the punches more to the right is achieved.
` 10~8Zll The motor 2 normally drives both drive gear wheel 3 and conveyor wheel 10 for moving punches 9 and pipes 30 at an identical rate.
In the drawing twelve pairs of opposite punches 9, 9', etc. disposed on a supporting beam 8, are shown.
Although these punches 9, 9a, 9b could all simultan-eously contact plastic pipe 30, it is advisable to perform perforation in sequential manner. For that purpose the lengths of the punches differ, so that first the longest pairs of punches 9d, 9e, 9j and 9k contact the plastic pipe and subsequently pairs of punches 9b, 9c, 9h and 9i, whereafter the remaining pairs of punches follow.
The pairs of punches 9, 9', etc., are disposed in planes which may assume a position perpendicular to the axis of envelope 11, their lateral spacing being selected, of course, such that the punches contact the pipe 30.
When the pipes have a substantially helical profile then the pairs of punches are arranged in such a way that they perforate in two consecutive wave valleys.
; 6 , . . .
Claims (16)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for manufacturing perforated plastic pipe particularly corrugated thermoplastic pipe, the wave valleys of which are perforated by conveying plastic pipe continuously through a perforation zone and perforating the pipe due to the action of at least one movable punch member, wherein at least during the engagement time with a plastic pipe a movement in the direction of conveyance of the plastic pipe is imparted to the punch member, which movement equals the rate of conveyance of the plastic pipe, while during punching action the punch members retain substantially a perpendicular position with respect to the plastic pipe.
2. A method as claimed in claim 1, wherein the speed of movement in the direction of conveyance imparted to the punch member is maintained during the entire time of contact between the plastic pipe and punch member.
3. A method as claimed in claim 1, wherein on leaving the plastic pipe, a movement in the direction of conveyance of the plastic pipe is likewise imparted to the punch member and which is equal to the rate of conveyance of the plastic pipe.
4. A method as claimed in claim 1, wherein the punch member is moved reciprocally towards and away from the pipe by means of a punch holder connected with two eccentrices, the movement of the punch member being adapted to the rate of convey-ance of the pipe.
5. A method as claimed in claim 1, wherein pairs of punch members are caused to cooperate with the plastic pipe, while first punching members act in a zone spaced from the end of the perforation area in processed pipes.
6. A device for continuously perforating plastic pipe, particularly corrugated thermoplastic pipe, comprising a guide member for the plastic pipe, a pipe conveying member for conveying a pipe, at least one punch member for punching holes in the plastic pipe, an operating member for causing the punch member to act upon the pipe to be perforated, punch member actuating means for causing the punch member to move at the same rate as the pipe conveying member at least when the punch member is acting upon the pipe, and to maintain the punch member in a substantially perpendicular position with respect to the conveyed pipe when the punch member is perforating the pipe.
7. A device as claimed in claim 6, wherein the punch member actuator for causing the punch member to move at the same rate as the pipe conveying member, at least when the punch member is acting on the pipe, includes a first eccentric member.
8. A device as claimed in claim 7, wherein the punch member actuator for causing the punch member to move, comprises two eccentrics which cooperate with said first eccentric member to cause a uniform rate of advance of the punch member.
9. A device as claimed in claim 8, wherein the two eccentrics, which are interconnected by a connecting rod carry one or more punch members, and means are provided for driving the first eccentric member at the same speed.
10. A device as claimed in claim 9, wherein each of the two eccentrics has a saddle member, a spring being provided between the two saddle members.
11. A device as claimed in claim 10, wherein one of the eccentrics in the form of a disc is connected by a rod, with a cam roller which cooperates with the first eccentric which is in the form of a disc cam.
12. A device as claimed in claim 11, including a driv-ing member which is coupled to a drive gear wheel cooperating with gear wheels which carry the two eccentric discs and with a gear wheel on the cam.
13. A device as claimed in claim 12, wherein the driv-ing means operatively cooperates with the pipe conveying means.
14. A device as claimed in claim 13, wherein the con-necting beam carries parallel arranged pairs of punching members.
15. A device as claimed in claim 6, wherein the punch-ing members are of different lengths.
16. A device as claimed in claim 14, wherein the long-est punching members are located at the end of the beam, which constitutes the rear end of the beam as seen in the direction of conveyance of the beam.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7513480A NL181413C (en) | 1975-11-18 | 1975-11-18 | DEVICE FOR CONTINUOUSLY PERFORATING OPENINGS IN A PLASTIC TUBE. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1068211A true CA1068211A (en) | 1979-12-18 |
Family
ID=19824877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA266,043A Expired CA1068211A (en) | 1975-11-18 | 1976-11-18 | Method and device for manufacturing perforated plastic pipes |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5918202B2 (en) |
| CA (1) | CA1068211A (en) |
| DE (1) | DE2652169C3 (en) |
| DK (1) | DK152269C (en) |
| EG (1) | EG12174A (en) |
| FR (1) | FR2332114A1 (en) |
| GB (1) | GB1564736A (en) |
| NL (1) | NL181413C (en) |
| SE (1) | SE416385B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1119090A (en) * | 1979-01-11 | 1982-03-02 | Manfred A. A. Lupke | Apparatus and method for perforating tubing |
| DE3435379A1 (en) * | 1984-09-27 | 1986-04-03 | August Bilstein GmbH & Co KG, 5828 Ennepetal | DEVICE AND METHOD FOR PRODUCING HOLES IN PLASTIC HOLLOW PROFILE RODS |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3264920A (en) * | 1964-04-21 | 1966-08-09 | Hallden Machine Company | Flying press |
| BE794586A (en) * | 1972-01-31 | 1973-05-16 | B N G & Cie | DEVICE FOR MAKING TUBES |
| DK142167B (en) * | 1972-04-11 | 1980-09-15 | Oltmanns Heinrich Fa | Apparatus for generating holes in the wave valleys in plastic corrugated tubes, in particular for drainage purposes. |
| DE2318970C3 (en) * | 1973-04-14 | 1984-07-05 | Hinrichs Gmbh, 2054 Geesthacht | Flying scissors or punch for running material |
-
1975
- 1975-11-18 NL NL7513480A patent/NL181413C/en not_active IP Right Cessation
-
1976
- 1976-11-16 SE SE7612798A patent/SE416385B/en not_active IP Right Cessation
- 1976-11-16 DE DE19762652169 patent/DE2652169C3/en not_active Expired
- 1976-11-17 EG EG71576A patent/EG12174A/en active
- 1976-11-17 GB GB4796176A patent/GB1564736A/en not_active Expired
- 1976-11-18 CA CA266,043A patent/CA1068211A/en not_active Expired
- 1976-11-18 FR FR7634814A patent/FR2332114A1/en active Granted
- 1976-11-18 DK DK519376A patent/DK152269C/en not_active IP Right Cessation
- 1976-11-18 JP JP13786576A patent/JPS5918202B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1564736A (en) | 1980-04-10 |
| DE2652169A1 (en) | 1977-06-02 |
| SE7612798L (en) | 1977-05-19 |
| EG12174A (en) | 1979-03-31 |
| DK152269B (en) | 1988-02-15 |
| DK152269C (en) | 1988-07-25 |
| JPS5284259A (en) | 1977-07-13 |
| FR2332114B1 (en) | 1978-10-20 |
| DK519376A (en) | 1977-05-19 |
| FR2332114A1 (en) | 1977-06-17 |
| NL181413B (en) | 1987-03-16 |
| DE2652169C3 (en) | 1980-10-02 |
| NL181413C (en) | 1987-08-17 |
| DE2652169B2 (en) | 1980-02-14 |
| NL7513480A (en) | 1977-05-23 |
| JPS5918202B2 (en) | 1984-04-26 |
| SE416385B (en) | 1980-12-22 |
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