GB2037638A - Applying a metal sheath to an electric cable - Google Patents
Applying a metal sheath to an electric cable Download PDFInfo
- Publication number
- GB2037638A GB2037638A GB7943122A GB7943122A GB2037638A GB 2037638 A GB2037638 A GB 2037638A GB 7943122 A GB7943122 A GB 7943122A GB 7943122 A GB7943122 A GB 7943122A GB 2037638 A GB2037638 A GB 2037638A
- Authority
- GB
- United Kingdom
- Prior art keywords
- core
- shaping
- strip
- die
- sheath
- 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.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 27
- 239000002184 metal Substances 0.000 title claims abstract description 27
- 238000007493 shaping process Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims description 9
- 239000004411 aluminium Substances 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 239000004020 conductor Substances 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 4
- -1 polyethylene Polymers 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 239000013536 elastomeric material Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 235000004035 Cryptotaenia japonica Nutrition 0.000 description 1
- 235000015724 Trifolium pratense Nutrition 0.000 description 1
- 240000002913 Trifolium pratense Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
- H01B13/2613—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping
- H01B13/262—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping of an outer metallic screen
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Of Electric Cables (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Details Of Indoor Wiring (AREA)
- Insulated Conductors (AREA)
Abstract
In the application of a tubular metal sheath to the core of an electric cable by feeding the core and a metal strip continuously through a shaping die which wraps the strip around the core so that the opposite edges of the strip overlap and extend lengthwise of the core, the shaping-die 9 is resiliently deformable et least between a position 14 at which the edges of the strip are divergent or slightly convergent and a position 15 at which the strip is fully wrapped into tubular shape. As a result, the sheath is formed in close contact with the core despite any variations in the diameter of the core along its length. <IMAGE>
Description
SPECIFICATION
Applying a metal sheath to an electric cable
The present invention relates to a method of and an apparatus for applying a metal sheath to the core of an electric cable.
In this description the term "core" refers to the part of the cable bearing the transmission of power or signals, namely the conductors and their insulation, for example a bundle of stranded conductors or in general pairs of quads or trefoils forming telecommuncation cables, and the term "sheath" refers to an outer covering of the core, for example a tape or strip or also in a telephone cable a screen comprising an aluminium strip coated with thermoplastic material on the opposite surfaces or only on the outer surface and longitudinally wrapped around the core into a tubular shape.
One way of applying a metal sheath to a cable core comprises passing the core and a metal strip through a shaping-die, for example a device having inner walls, or equivalent and rigid guiding means, shaped so as to impart to the flat strip a tubular configuration, with overlapped edges, around the core. This method has has some drawbacks deriving from the formation of the cable core and of the shaping-die.
Thus, the core of an electric cable, in particular a core of long length may have a transverse dimension or diameter which differs more or less from the desired nominal value and for various reasons: for example, for lack of precision in the core manufacturing apparatus, or for example for variations in the stranding pitch in the case of a core formed of several stranded conductors. These variations of the core dimensions lead to adverse results during the passage of the core through the rigid shaping-die, which is dimensioned for a predetermined nominal value of the cable diameter.
In the case where the transverse dimension of the core exceeds the nominal value, the metal strip constrained between the inner walls of the shapingdie and the core may be subjected to high traction forces with the risk of possible stretching beyond that tolerable.
In the case where the transverse dimension of the core is less than the nominal value, the metal strip, shaped into a tubular configuration by the shapingdie walls, does not form a close contact with the core.
Consequently, these shaping-dies are not able to guarantee the formation of a metal sheath which is, at the same time, complete and protective for the whole cable length and closely contacting the core.
In accordance with this invention, there is provided a method of applying a tubular metal sheath to a core of an electric cable, comprising the steps of advancing the core longitudinally of itself, advancing a metal strip simultaneously with said core and applying shaping forces to the strip to wrap the strip around the core to form the sheath, the edges of the strip extending longitudinally of the sheath and overlapping, wherein the shaping forces are resiliently applied between two stationary positions relative to the movement of the core and sheathstrip, the first position being that in which the strip has its edges diverging parallel or slightly converging and the core is in contact with the strip over a longitudinal medial region thereof, and the second position being that in which the strip is in a tubular shape with overlapped edges, the core exerting radially outwards forces which are resiliently reacted by said shaping forces so that variations in the transverse dimensions of the core are accommodated and the sheath adheres closely to the core throughout its length.
Subsequently the sheathed core may undergo further steps for completing the cable, depending on the type of the cable and on the material which it is desired to apply over the sheath. For example, a plastics layer may be extruded over the metal sheath art a distance from said second position.
In a preferred embodiment to be described herein, the method is used to sheath a core which comprises a bundle of electric conductors stranded together for a telephone cable, the sheath being formed by an aluminim tape coated on both sides with a thermoplastics materials, for example polyethylene.
Also in accordance with the invention, there is provided an apparatus for applying a sheath to a core of an electric cable, comprising a shaping-die for receiving the cable core passing longitudinally of itself through said shaping die and for receiving a metal strip also passing longitudinally of itself through said shaping die and wrapping said strip around the core so that its edges overlap, said shaping-die having a tapering passage therethrough and being resiliently deformable between a first section in which the strip edges are divergent, parallel, or slightly convergent and a final section where the strip is closed in tubular shape around the core, said resilence of the shaping-die causing resilient deformation thereof as the core and strip pass through the shaping-die in such a way that variations in the transverse dimensions of the core are followed by the shaping-die and the strip adheres to the core in consequence of resilient reaction forces exerted by the shaping-die.
Preferably, the shaping-die of the apparatus comprises a resiliently deformable element having shaping surfaces and formed of stainless steel.
An embodiment of this invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
Figure 1 is a cross-section of a cable after manufacture;
Figure 2 is a plan view of a sheathing apparatus for applying the sheath of the cable shown in Figure 1;
Figure 3 is a perspective view of the apparatus of
Figure 2, showing the sheath being formed around the core;
Figure 4 is a front view of the apparatus showing a final shaping stage;
Figure 5 is a cross-section of the apparatus showing the cable in a first manufacturing stage; and
Figure 6 is a cross-section of the apparatus showing the cable in a manufacturing step subsequent to Figure 5.
The manufactured cable shown in Figure 1 is a telephone cable comprising a core 2 having a bundle of electric conductors 3 stranded together in a known way, a sheath 4 formed from a metal strip wrapped longitudinally around the core with overlapped edges 5 and 6, and an outer layer 7 extruded over the sheath 4. The metal strip is an aluminium tape coated on both sides with thermoplastics material to permit the overlapping edges 5 and 6 to adhere through welding. The sheath 4 has the function of screening the core from any outside electric fields and constitutes a further protective element for the core. The metal strip may be of different material, with or without the coating on both sides, providing it still provides screening and protection and facility for adhering together the edges 5 and 6.The cable may comprise other elements in accordance with known cable making practices, but no such elements are shown herein because they are not necessary for an understanding of the invention.
The apparatus 8 (Figures 2 and 3) for manufacturing the cable 1 of Figure 1 comprises a shaping-die 9 for shaping the flat aluminium tape or strip into a tubular configuration with overlapped edges disposed around the core 2, means 11 and 12 respectively for guiding the tape longitudinally of itself towards the shaping-die 9 and for guiding and centering the core 2, and an extruder (not shown) for covering the sheath 4 with the outer layer 7.
The shaping-die 9 comprises shaping parts made of an elastically or resiliently deformable metal, for example stainless steel.
Upstream of the shaping-die 9, a pre-shaping-die 13 is arranged to receive and to gradually shape the aluminim tape until its edges 5 and 6 are divergent, or slightly convergent, in the upward direction when the sheath enters an inlet section 14 of the shapingdie 9.
The shaping-die 9 comprises, starting from the inlet section 14 towards an outlet section 15, a portion constituted by a first surface 16 having a curved bottom 17 and lateral walls 18 and 19, the cross-sectional area for through-passage of the core 2 and tape gradually decreasing, and a second portion constituted by a second surface 20 substantially obtained by the prolongation of the first; the first and second surfaces 16 and 20 are arranged respectively to give a tubular shape to the sheath 4, and to gauge the sheath 4 to closely adhere around the core 2 for its whole length.
The first surface 16 comprised between the section 14 and a section 21 is constituted by a first length 22 comprised between the section 14 and a section 23 in which the lateral walls 18, 19 change from a divergent, parallel or slightly convergent configuration to a pronounced convergent configuration and by a second length 24, in which the walls 18 and 19 are circumferentially overlapped so as to provide a funnel-shaped tubular duct. The geometry of the second length 24 is intentionally chosen.
The overlapped lateral walls 18 and 19 provide between them a space through which the upper edge 6 of the advancing tape passes while simultaneously the lower edge 5 is guided, through the same length 24, between the wall 18 and the core 2 (see Figure 6).
In other words the overlapping of the lateral walls 18 and 19 is arranged to permit separate guiding of the edges 5 and 6 of the already tubular-shaped tape, and this action prepares and supports an evenness of the subsequent direct overlapping of the edges 5 and 6 and consequently also ensures a sealing of the sheath 4.
The second surface 20 comprises the prolongation of the bottom and of the wall 19 of the first surface 16 and a second wall 19' having a lip overlapping the wall 19. In practice, this second surface is equivalent to that which would be obtained by overlapping the lips of a metal foil wrapped into a tubular shape.
The second surface 20 has a transverse section smaller than that of the first surface 16 and is arranged to receive the sheath 4 already formed into a tubular shape around the core and to advance the edges 5 and 6 directly into contact.
Moreover, further resilient means comprising an associated spring 25 are provided, as clearly shown in Figure 4, in order to withstand the transverse variations of the channel defined by the second surface 20 when the core and the sheath pass through. This portion of the shaping-die could be provided with a plurality of such resilient means arranged to withstand the sizing variations of the core. Generally, the final part of the shaping-die 9 constitutes the gauging of the sheath around the core.
Tape feeding means 11 is shown for sake of simplicity as a single transmission roller 26 and core guiding means 12 is shown as consisting of two cylinders with vertical axis 27, 27' between which the core, passing lengthwise of itself towards the preshaping-die 13, is centred. A pressure roller 28 is provided adjacent the pre-shaping-die 13 in order for its periphery to press on the upper side of the core during its advancement and to press the aluminium tape onto the curved bottom of the pre-shaping-die; in such away, a longitudinal stretching of the tape over a central longitudinal zone is predetermined, compensating for the stretching of the edges which occurs in the shaping-die.
The extruder, provided at the outlet of the shaping-die, may be arranged to extrude polyethylene or otherthermoplastics material over the metal sheath.
In operation, the aluminium tape being fed from the transmission roller 26 is directed onto the bottom of the pre-shaping die 13 and of the shapingdie 9 and is wrapped longitudinally around the cable core 2 which is continuously advanced longitudinally of itself, passing between the centering cylinders of the guiding means 12, and below and in contact with the pressure roller 28 periphery and then through the shaping-die 9 and the extruder.
During the passage of the core 2 through preshaping-die 13, the aluminium tape is gradually shaped from its original flat condition into a final configuration in which the central longitudinal zone 30 of the tape is closely in contact with the lower side of the core, and the edges directed upwards, as clearly shown in Figure 5. Also, during this step, the pressure roller 28 pressing the core 2 against the central zone 30 of the tape gives rise to a longitudinal stretching of said zone 30 compensating, as mentioned above, the stretching to which the edges 5 and 6 are subjected in the subsequent shaping-die 9.
Therefore, the tape length is kept substantially equal across its width to avoid wrinkles, and thus providing favourable conditions for an efficient subsequent over-lapping of the edges 5 and 6.
After leaving the pre-shaping-die 13, the aluminium tape undergoes further shaping around the core 2, in the lengths 22 and 24 of the first surface 16 of the shaping-die 9. During passage through the first length 22, the edges 5 and 6 of the tape, continuously advancing from left to right as seen in
Figures 2 and 3, follow the convergency of the walls 18 and 19. In subsequent passage through the length 24, the edges 5 and 6 still follow the convergency of the two walls 18 and 19 until they are overlapped, without reaching into contact one with the other since they are guided separately and at a distance (see Figure 6). Thus, as already mentioned, the upper edge 6 passes through the length 24 between the shaping-die walls 18 and 19 and the lower edge 5 passes through the same length between the wall 18 and the core 2.
Therefore, the edges 5 and 6, pressed separately on opposite sides respectively between the two shaping-die walls 18, 19 and between the shapingdie wall 18 and the core (see Figure 6), and subjected at the same time to a traction force towards the extruder, are stretched obtaining in such a way a tubular shape devoid of wrinkles and any other irregularities.
Moreover, in the shaping-die length 24, owing to the resilient or elastically deformable characteristic of the lateral walls 18 and 19, variations in transverse dimensions of the core are followed by the surface 16 of the shaping-die and the consequent deformation of this surface gives rise to elastic or resilient reactions with the effect of keeping the edges 5 and 6 of the tape tight around the core.
After the length 24, the core and the sheath 4 pass through the channel defined by the second surface 20 of the shaping-die 9. The passage of the tape from the outlet section 21 of the length 24 to the outlet of the shaping die 9 takes places with the edges 5 and 6 directly in contact, since whilst the shaping-die wall 19 continues up to the outlet section 15, the wall 18 is broken off at the end of the length 24; consequently, the lower surface of the edge 6 is no longer supported and guided by the wall 18 and comes into contact with the lower edge 5 and these edges are pressed together under high pressure by the action of the spring 25 between the core 2 and the inner surface of the shaping die.The edges 5 and 6 of the sheath 4 leaving the shaping-die are maintained in contact around the sheath 4 by the extrusion of polyethylene layer 7.
The sheath-applying apparatus may be used, obtaining the same advantages, for telephone cables of different type, for example fully-filled cables in which the core comprises individually insulated wires stranded together and petroleum-based gels disposed between the sheath and conductors. In this case the shaping-die, having elastically or resiliently deformable walls, gives an adherence between the sheath and the conductors which is notably better than with respect to known apparatus having rigid shaping-dies.
In particular, the apparatus shown in the drawings can be applied to telephone cables having a nominal diameter of 20 mm or more.
It is possible to overlap the lateral walls 18 and 19 of the shaping-die to a greater or lesser extent and thus to realize a funnel shape corresponding to the transverse dimension of the cable which is desired to sheath. The adjustment is carried out by a nut 29 threaded on a bolt which is pivoted, as shown in
Figure 4, to one jaw member and passes through a second jaw member: these two jaw members are pivoted to a base member as shown and the spring 25 acts between the nut 29 and said second jaw member.
The shaping-die can be constructed from a plurality of pieces instead of only the one piece of the apparatus shown. For example, the final section, provided with the resilient clamping means including spring 25, could be separate from the up-stream portion of the shaping-die, which latter portion could then be provided with similar clamping means of its own.
Claims (13)
1. A method of applying a tubular metal sheath to a core of an electric cable, comprising the steps of advancing the core longitudinally of itself, advancing a metal strip simultaneously with said core and applying shaping forces to the strip to wrap the strip around the core to form the sheath, the edges of the strip extending longitudinally of the sheath and overlapping, wherein the shaping forces are resiliently applied between two stationary positions relative to the movement of the core and sheathstrip, the first position being that in which the strip has its edges diverging parallel or slightly converging and the core is in contact with the strip over a longitudinal medial region thereof, and the second position being that in which the strip is in a tubular shape with overlapped edges, the core exerting radially outwards forces which are resiliently reacted by said shaping forces so that variations in the transverse dimensions of the core are accommodated and the sheath adheres closely to the core throughout its length.
2. A method as claimed in claim 1, further comprising extruding a plastics or elastomeric material around the sheathed core.
3. A method as claimed in claim 1 or 2, wherein the core comprises a bundle of electric conductors stranded together for a telephone cable, said sheathstrip comprising an aluminium tape coated on both sides with polyethylene.
4. An apparatus for applying a sheath to a core of an electric cable, comprising a shaping-die for receiving the cable core passing longitudinally of itself through said shaping die and for receiving a metal strip also passing longitudinally of itself through said shaping-die and wrapping said strip around the core so that its edges overlap, said shaping-die having a tapering passage therethrough and being resiliently deformable between a first section in which the strip edges are divergent parallel, or slightly convergent and a final section where the strip is closed in iul,iilni shape around the core, said resilience of the shaping-die causing resilient deformation thereof as the core and strip pass through the shaping-die in such a way that variations in the transverse dimensions of the core are followed by the shaping-die and the strip adheres to the core in consequence of resilient reaction forces exerted by the shaping-die.
5. An apparatus as claimed in claim 4, in which the shaping-die comprises a resiliently deformable metal element having shaping surfaces for the sheath-strip.
6. An apparatus as claimed in claim 5, in which the said metal element comprises stainless steel.
7. An apparatus as claimed in claim 5 or 6, in which said metal element comprises, from an inlet section towards an outlet section, a first surface having a curved bottom and lateral walls at first gradually convergent in the upwards direction and then after a predetermined length circumferentially overlapped to form a tapering tubular duct, a second surface which comprises a prolongation of the bottom and of one lateral wall of the first surface and a further wall overlapped with the prolongation said one lateral wall of the first surface, said second surface defining a tubular channel of smaller transverse dimension than the outlet section of said first surface, said first surface being arranged to gradually approach to each other the sheath edges in a first length, and in a second length to complete the approaching together of the strip edges to form the tubular sheath, said overlapped walls of the first surface being arranged to guide the radially outermost edge of the strip, and said second surface being arranged to receive the already formed sheath and to overlap into close contact the two edges of the strip.
8. An apparatus as claimed in claim 7, comprising further resilient means associated with the second shaping-die surface.
9. An apparatus as claimed in claim 8, in which said further resilient means comprises a spring arranged to withstand variations in transverse dimension of the passage defined by the second surface when the core passes therethrough.
10. An apparatus as claimed in any one of claims 7 to 9, further comprising a pressure roller acting on an upper side of the core to press the underlying strip onto the curved bottom of the shaping-die.
11. An apparatus as claimed in any one of claims 4 to 10, further comprising an extruder disposed downstream of the shaping-die and means for feeding and guiding said core and sheath-strip towards the shaping die.
12. A method of applying a tubular metal sheath to a core of an electric cable, said method being as claimed in claim 1 and substantially as herein described with reference to the accompanying drawings.
13. An apparatus for applying a sheath to a core of an electric cable, said apparatus being substantially as herein described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT31029/78A IT1101069B (en) | 1978-12-20 | 1978-12-20 | METHOD AND RELATED EQUIPMENT FOR COATING THE SOUL OF AN ELECTRIC CABLE WITH A METAL SHEATH |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2037638A true GB2037638A (en) | 1980-07-16 |
| GB2037638B GB2037638B (en) | 1982-10-06 |
Family
ID=11232981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7943122A Expired GB2037638B (en) | 1978-12-20 | 1979-12-14 | Applying a metal sheath to an electric cable |
Country Status (8)
| Country | Link |
|---|---|
| AR (1) | AR223358A1 (en) |
| BR (1) | BR7908334A (en) |
| CA (1) | CA1146421A (en) |
| ES (1) | ES487542A0 (en) |
| FR (1) | FR2445001A1 (en) |
| GB (1) | GB2037638B (en) |
| IT (1) | IT1101069B (en) |
| MX (1) | MX150714A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4377908A (en) * | 1981-05-18 | 1983-03-29 | Northern Telecom Limited | Method and apparatus for bending the overlapping edge portions of a metal shield around a cable core |
| DE3436616A1 (en) * | 1983-11-30 | 1985-06-05 | Fuji Machinery Co., Ltd., Nagoya, Aichi | RAIL SHAPING DEVICE |
| AU574155B2 (en) * | 1984-04-16 | 1988-06-30 | Fuji Machinery Co. Ltd. | Web forming apparatus |
| CN114131948A (en) * | 2021-11-25 | 2022-03-04 | 成都中企动力技术服务有限公司 | Method and system for producing foaming reinforcement winding pipe by two-step method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL94813C (en) * | 1954-05-06 | 1960-07-15 | ||
| US3026924A (en) * | 1957-11-26 | 1962-03-27 | Ansonia Wire & Cable Company | Apparatus for sheathing a cable or the like |
| FR1358033A (en) * | 1963-05-22 | 1964-04-10 | Siemens Ag | Method for the longitudinal coating of a core extending in length by a strip of insulating material and, in particular, of a cable sheath, by an anti-corrosion protective strip |
| FR1484566A (en) * | 1966-06-27 | 1967-06-09 | Gen Cable Corp | Method and machine for the manufacture of electric cables |
| US3504102A (en) * | 1968-05-28 | 1970-03-31 | Gen Cable Corp | Laminated cable jacket with sealed and reinforced seam |
| DE2415932A1 (en) * | 1974-04-02 | 1975-10-09 | Cfs Corp | Long pipe length coating appts. - with concentric mandrel tube and former for injecting thick coating and applying film wrapping |
-
1978
- 1978-12-20 IT IT31029/78A patent/IT1101069B/en active
-
1979
- 1979-11-21 FR FR7928702A patent/FR2445001A1/en active Granted
- 1979-12-10 MX MX180417A patent/MX150714A/en unknown
- 1979-12-14 GB GB7943122A patent/GB2037638B/en not_active Expired
- 1979-12-17 AR AR279317A patent/AR223358A1/en active
- 1979-12-19 ES ES487542A patent/ES487542A0/en active Granted
- 1979-12-19 BR BR7908334A patent/BR7908334A/en unknown
- 1979-12-20 CA CA000342355A patent/CA1146421A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4377908A (en) * | 1981-05-18 | 1983-03-29 | Northern Telecom Limited | Method and apparatus for bending the overlapping edge portions of a metal shield around a cable core |
| DE3436616A1 (en) * | 1983-11-30 | 1985-06-05 | Fuji Machinery Co., Ltd., Nagoya, Aichi | RAIL SHAPING DEVICE |
| US4576588A (en) * | 1983-11-30 | 1986-03-18 | Fuji Machinery Company, Ltd. | Adjustable tube forming apparatus |
| AU574155B2 (en) * | 1984-04-16 | 1988-06-30 | Fuji Machinery Co. Ltd. | Web forming apparatus |
| CN114131948A (en) * | 2021-11-25 | 2022-03-04 | 成都中企动力技术服务有限公司 | Method and system for producing foaming reinforcement winding pipe by two-step method |
| CN114131948B (en) * | 2021-11-25 | 2023-09-22 | 成都中企动力技术服务有限公司 | Method and system for producing foam reinforcement winding pipe by two-step method |
Also Published As
| Publication number | Publication date |
|---|---|
| AR223358A1 (en) | 1981-08-14 |
| ES8101807A1 (en) | 1980-12-16 |
| ES487542A0 (en) | 1980-12-16 |
| IT1101069B (en) | 1985-09-28 |
| BR7908334A (en) | 1980-09-16 |
| FR2445001A1 (en) | 1980-07-18 |
| CA1146421A (en) | 1983-05-17 |
| GB2037638B (en) | 1982-10-06 |
| IT7831029A0 (en) | 1978-12-20 |
| FR2445001B1 (en) | 1982-10-08 |
| MX150714A (en) | 1984-07-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19941214 |