US3771934A - Apparatus for extending water-blocked cartwheel cable - Google Patents
Apparatus for extending water-blocked cartwheel cable Download PDFInfo
- Publication number
- US3771934A US3771934A US00105598A US3771934DA US3771934A US 3771934 A US3771934 A US 3771934A US 00105598 A US00105598 A US 00105598A US 3771934D A US3771934D A US 3771934DA US 3771934 A US3771934 A US 3771934A
- Authority
- US
- United States
- Prior art keywords
- vent
- dielectric
- passageway
- extrusion
- center conductor
- 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 - Lifetime
Links
Images
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
- H01B13/06—Insulating conductors or cables
- H01B13/18—Applying discontinuous insulation, e.g. discs, beads
- H01B13/185—Applying discontinuous insulation, e.g. discs, beads by periodically constricting an insulating sleeve
-
- 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
- B29C48/06—Rod-shaped
-
- 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
- B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-shaped
-
- 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
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
-
- 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
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
-
- 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
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
-
- 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
- B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
-
- 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
- B29L2031/00—Other particular articles
- B29L2031/60—Multitubular or multicompartmented articles, e.g. honeycomb
Definitions
- ABSTRACT A submersible coaxial cable has a plurality of longitudinal air spaces symmetrically spaced in the dielectric material around the inner conductor with sections collapsed at regular intervals along each air space to form water blocks in the passageways. Apparatus is provided to extrude the dielectric in the desired form and collapse the walls at selected intervals.
- This invention relates to coaxial cables having an air spaced dielectric.
- Cellular polythene if used for buried installations, absorbs moisture unless a high integrity welded metal outer conductor is used, which adversely affects the transmission characteristics. Likewise the air-spaced configuration is prone to flooding of the intersticial air passageways should a joint fall-or should damage occur to the sheath when using a non-welded outer conductor.
- a coaxial cable having a center conductor, an outer conductor surrounding the center conductor and spaced therefrom by an extruded dielectric, and a plurality of longitudinal passageways in the dielectric each.
- the invention also provides apparatus for manufac-.
- an extrusion tool having a plurality of members each for the formation of alongitudinal passageway in the extruded dielectric, a vent tube in each member which normally communicates at one end with the atmosphere and communicates during extrusion at the other end with the passageway extruded around the member, and means to close or partially evacuate each vent tube during extrusion so that the associated passageway becomes blocked with extrudate overa region adjacent the end of the tool.
- FIG. 1(a) shows a portion of air-spaced coaxial cable
- FIG. 1(b) shows the portion of cable of FIG. 1(a) formed with a water block
- FIG. 1(c) shows a section through the water block of FIG. 1(b);
- FIG. 1(d) is a longitudinal. cross-sectional view through the water block of FIG. 1(b);
- FIG. 2(a) shows an extrusion tool for forming cable having a dielectric cross-section as shown in FIGS. 1(a) to 1(d);
- FIG. 2(b) is a longitudinal cross-section of the extrusion tool of FIG. 2(a);
- FIG. 3 is a cross-sectional view of an alternative type of air-spaced coaxial cable
- FIG. 4 is an extrusion tool for forming the cable of FIG. 3;
- FIG. 5 shows a system of vent valves for forming the water blocks in the cable of FIGS. 1(a) to 1(d);
- FIG. 6 shows in detail the construction of the vent valves shown in FIG. 5.
- the air-spaced coaxial cable includes a center conductor 1, an outer tubular conductor 2, shown as a broken line, and a dielectric 3 of cart wheel cross-section between the conductors.
- the spokes of the cart wheel define air passageways 4 therebetween which extend along the length of the cable.
- FIGS. .l(b), 1(c) and 1(d) show how a passageway can be blockedto restrict the passage of water therealong in the event of such damage.
- a portion 5 of the outer wall of the dielectric is collapsed over a limited region onto the two spokes 6.and 7 forming the other two sides of the passageway. This operation is carried out during extrusion of the dielectric while the latter is still soft, as will be described below.
- Each passageway is blocked at regular intervals along its length; thus longitudinal ingress of water beyond a certain amount in each direction is prevented.
- the extrusion tool for forming the dielectric includes an extended nose 8 having five segments such as 9.
- the slots between each segment serve to form the spokes of the cart wheel dielectric.
- a central bore 10 is provided in the nose 8 along which the center conductor passes durin'gextrusiomThe bore increases in diameter over a region 11 adjacent the end ofthe nose and communicates with the slots over thisregion.
- the inner tubular wall of the cart wheel dielectric is formed in this region by extrusion between the center conductor and the inner surfaces of the segment.
- the outer tubular wall of the dielectric isformed by extrusionbetween the outer surfaces of the segments and the collar 12.
- extrudate flows into the extrusion tool in the direction shown by the arrows in FIG. 2(a).
- the center conductor is passed at a predeterined rate along the bore 10, and the cart wheel shaped dielectric is formed as described above.
- a vent tube, such as 13, communicating with the atmosphere at the rear of the extrusion tool is provided in each segment.
- the corresponding vent tube is closed for a short time.
- the pressure of air in the passageway thus decreases as extrusion continues and the pressure of the external atmosphere collapses a portion of the freshly formed outer tubular wall of the dielectric onto the two spokes forming the outer two sides of the passageway.
- the wall collapses immediately beyond the end of the nose 8, since this is the softest region of the extruded dielectric.
- the length of the collapsed region can be controlled by varying the length of time for which the vent tube is closed. Eventually, as the collapsed region travels away from the tool, the dielectric cools and the outer walls becomes firmly sealed to the spokes.
- the volume of the vent tube and the unblocked air passageway may tend to act as a reservoir of air tending to smooth out fluctuations of pressure when the vent tube is closed, it is preferable to apply a vacuum pump to the vent tube thus obtaining a large pressure difference in a short time.
- FIG. 3(a) shows an alternative to the cartwheel configuration for an air-spaced coaxial cable, in which the dielectric 14 has a plurality of symmetrically spaced circular passageways such as 15 positioned round the center conductor 16.
- FIG. 4 shows the extrusion tool for forming a dielectric of such a cross-section. Extrudate flows into the tool between the collar 17 and the core 18 in the direction of the arrows. At the same time the center conductor l9 emerges at a predetermined rate from a central bore in the core 18. Tubular members as 20 emerge from the conical nose of the core and these give rise during extrusion to the air passageways in the dielectric.
- the members20 which are hollow and thus serve as their own vent tubes, communicate in pairs with respective vent chambers in the core, only one vent chamber 21 being shown as a broken line.
- a given vent chamber is closed at the atmosphere or evacuated, the two air passageways formed by the tubular member associated with that vent chamber become filled with extrudate over a region adjacent the end of the extrusion tool, thus forming the required water blocks.
- Such a pair of blocked passageways are shown symbolically at 30 in FIG. 3(b).
- each vent tube at the rear of the extrusion tool is connected by means of a small bore pipe such as 22 to the inlet of a respective camoperated vent valve 23.
- the vent valves are arranged in turn by a rotating cam 24.
- each valve comprises a housing 25 in which a springloaded position 26 is sliding fit.
- the piston has a portion of reduced diameter 27 provided with a piston valve 28
- the piston When the piston is in the lower position as shown, the small bore piping 22 is in communication with the atmosphere via the outlet 31, but when the piston is actuated by the cam 24 the pipe 22 is cut off from the atmosphere and brought solely into communication with a closed stopcock or with a vacuum pump via the outlet 29. When this occurs a water block is formed in the associated air passageway in the manner described.
- the cam 24 is operated by means of a pulley, rotated by the center conductor which passes round the pulley as it travels towards the extrusion tool, and change gears.
- the rotary speed of the cam is proportional to the speed of the center conductor, and can be preset by means of the change gears and the diameter of the pulley. By this means the length interval between water blocks may be changed.
- Apparatus for manufacturing a coaxial cable having a dielectric formed by extrusion and a moving center conductor comprising an extrusion tool having a plurality of longitudinally disposed members spaced about said center conductor, each member forming a longitudinal passageway in the extruded dielectric, a vent tube in each member which normally communicates at one end with the atmosphere and communicates during extrusion at the other end with the passageway formed in said dielectric extruded around the member, and means for sequentially interrupting the air flow and reducing the pressure in each vent tube at different times fromreachv other vent tube during extrusion to block each associated passageway with extruded dielectric over a region adjacent the end of the tool at longitudinal and circumferential locations along the cable different than each other passageway.
- said means includes a plurality of vent valves, said vent tubes being connected to the inlets of respective valves, each vent valve being a first outlet in communication with the atmosphere and also normally with the inlet, a second outletin which air flow is interrupted and pressure reduced during extrusion, and actuating means which when operated connects the inlet solely with the second outlet.
- vent valve actuating means are cam-operated and the valves are arranged in a circular configuration with their actuating means facing the center of the circle, the apparatus also including a cam mounted for rotation about an axis at the center of the circle to actuate each valve in turn and driven at an angular speed proportional to the speed of the center conductor.
Abstract
A submersible coaxial cable has a plurality of longitudinal air spaces symmetrically spaced in the dielectric material around the inner conductor with sections collapsed at regular intervals along each air space to form water blocks in the passageways. Apparatus is provided to extrude the dielectric in the desired form and collapse the walls at selected intervals.
Description
United States Patent 1191 Delves-Brougliton 1 Nov. 13, 1973 [54] APPARATUS FOR EXTENDING 2,708,176 5/1955 Rhodes 264/209 X WATER-BLOCKED CARTWHEEL CABLE [75] Inventor: Paul N. Delves-Broughton, FOREIGN PATENTS OR APPLICATlONS S h w l l d 16,542 7/191 1 Great Britain 425/1 13 811,703 4/1959 Great Britain 425/1 13 [73] Ass1gnee: International Standard Electric Corporation, New York, N.Y.
Filed: Jan. 11, 1971 Appl. No.: 105,598
Related U.S. Application Data Division of Ser. No. 800,178, Feb. 18, 1969, Pat. No. 3,588,313.
U.S. Cl 425/135, 264/209, 425/155, 425/380, 425/465 Int. Cl B29f 3/03 Field of Search 425/113, 380, 465, 425/135, 155; 264/173, 209
Schanz 264/209 X Primary Examiner-R. Spencer Annear Attorney-C. L. Johnson, Jr.
[57] ABSTRACT A submersible coaxial cable has a plurality of longitudinal air spaces symmetrically spaced in the dielectric material around the inner conductor with sections collapsed at regular intervals along each air space to form water blocks in the passageways. Apparatus is provided to extrude the dielectric in the desired form and collapse the walls at selected intervals.
5 Claims, 10 Drawing Figures SHEET 2 OF 3 PATENTEU NOV 13 I975 PATENTEBNUV 13 ms SHEET 3 OF 3 This application is a division of an earlier pending ap- I plication Ser. No. 800,178, filed Feb. 18, l969and now issued as U.S. Pat. No. 3,588,313.
BACKGROUND OF THE INVENTION.
1. Field of the Invention This invention relates to coaxial cables having an air spaced dielectric.
2. Description of the Prior Art In a coaxial cable of a given characteristic impedance and attenuation, a smaller overall diameter of the dielectric and hence of the outer conductor and sheath can be obtained by using cellular polythene or known air-spaced cart wheel designs instead of a solid extruded polythene construction.
Cellular polythene, if used for buried installations, absorbs moisture unless a high integrity welded metal outer conductor is used, which adversely affects the transmission characteristics. Likewise the air-spaced configuration is prone to flooding of the intersticial air passageways should a joint fall-or should damage occur to the sheath when using a non-welded outer conductor.
SUMMARY OF THE INVENTION According to the present invention there is provided.
a coaxial cable having a center conductor, an outer conductor surrounding the center conductor and spaced therefrom by an extruded dielectric, and a plurality of longitudinal passageways in the dielectric each.
the cable.
The invention also provides apparatus for manufac-.
turing a coaxial cable having a dielectric formed by extrusion around a moving center conductor, including an extrusion tool having a plurality of members each for the formation of alongitudinal passageway in the extruded dielectric, a vent tube in each member which normally communicates at one end with the atmosphere and communicates during extrusion at the other end with the passageway extruded around the member, and means to close or partially evacuate each vent tube during extrusion so that the associated passageway becomes blocked with extrudate overa region adjacent the end of the tool.
Embodiments of'the invention will now be described by way of example, with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1(a) shows a portion of air-spaced coaxial cable;
FIG. 1(b) shows the portion of cable of FIG. 1(a) formed with a water block; 7
FIG. 1(c) shows a section through the water block of FIG. 1(b);
FIG. 1(d) is a longitudinal. cross-sectional view through the water block of FIG. 1(b);
FIG. 2(a) shows an extrusion tool for forming cable having a dielectric cross-section as shown in FIGS. 1(a) to 1(d);
FIG. 2(b) is a longitudinal cross-section of the extrusion tool of FIG. 2(a);
FIG. 3 is a cross-sectional view of an alternative type of air-spaced coaxial cable;
FIG. 4 is an extrusion tool for forming the cable of FIG. 3;
FIG. 5 shows a system of vent valves for forming the water blocks in the cable of FIGS. 1(a) to 1(d); and
FIG. 6 shows in detail the construction of the vent valves shown in FIG. 5.
DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1(a) the air-spaced coaxial cable includes a center conductor 1, an outer tubular conductor 2, shown as a broken line, and a dielectric 3 of cart wheel cross-section between the conductors. The spokes of the cart wheel define air passageways 4 therebetween which extend along the length of the cable. As mentioned above there is a danger of flooding of these passageways should damage occur to the cable.
FIGS. .l(b), 1(c) and 1(d) show how a passageway can be blockedto restrict the passage of water therealong in the event of such damage. A portion 5 of the outer wall of the dielectric is collapsed over a limited region onto the two spokes 6.and 7 forming the other two sides of the passageway. This operation is carried out during extrusion of the dielectric while the latter is still soft, as will be described below. Each passageway is blocked at regular intervals along its length; thus longitudinal ingress of water beyond a certain amount in each direction is prevented.
Referring now to FIGS. 2(a) and 2(b), the extrusion tool for forming the dielectric includes an extended nose 8 having five segments such as 9. The slots between each segment serve to form the spokes of the cart wheel dielectric. A central bore 10 is provided in the nose 8 along which the center conductor passes durin'gextrusiomThe bore increases in diameter over a region 11 adjacent the end ofthe nose and communicates with the slots over thisregion. The inner tubular wall of the cart wheel dielectric is formed in this region by extrusion between the center conductor and the inner surfaces of the segment. The outer tubular wall of the dielectric isformed by extrusionbetween the outer surfaces of the segments and the collar 12.
During operation, extrudate flows into the extrusion tool in the direction shown by the arrows in FIG. 2(a). At the same time the center conductor is passed at a predeterined rate along the bore 10, and the cart wheel shaped dielectric is formed as described above. A vent tube, such as 13, communicating with the atmosphere at the rear of the extrusion tool is provided in each segment. By this means the air pressure in the passageways formed by the segments is equalized to the pressure of the atmosphere.
To form a water block in a passageway, the corresponding vent tube is closed for a short time. The pressure of air in the passageway thus decreases as extrusion continues and the pressure of the external atmosphere collapses a portion of the freshly formed outer tubular wall of the dielectric onto the two spokes forming the outer two sides of the passageway. The wall collapses immediately beyond the end of the nose 8, since this is the softest region of the extruded dielectric. The length of the collapsed region can be controlled by varying the length of time for which the vent tube is closed. Eventually, as the collapsed region travels away from the tool, the dielectric cools and the outer walls becomes firmly sealed to the spokes.
' Since the volume of the vent tube and the unblocked air passageway may tend to act as a reservoir of air tending to smooth out fluctuations of pressure when the vent tube is closed, it is preferable to apply a vacuum pump to the vent tube thus obtaining a large pressure difference in a short time.
During continuous extrusion the passageways are blocked in sequantial order at regular intervals along the length of the cable. Apparatus for carrying this out will be described below with reference to FIGS. 5, 6 and 7.
FIG. 3(a) shows an alternative to the cartwheel configuration for an air-spaced coaxial cable, in which the dielectric 14 has a plurality of symmetrically spaced circular passageways such as 15 positioned round the center conductor 16.
FIG. 4 shows the extrusion tool for forming a dielectric of such a cross-section. Extrudate flows into the tool between the collar 17 and the core 18 in the direction of the arrows. At the same time the center conductor l9 emerges at a predetermined rate from a central bore in the core 18. Tubular members as 20 emerge from the conical nose of the core and these give rise during extrusion to the air passageways in the dielectric.
The members20, which are hollow and thus serve as their own vent tubes, communicate in pairs with respective vent chambers in the core, only one vent chamber 21 being shown as a broken line. When a given vent chamber is closed at the atmosphere or evacuated, the two air passageways formed by the tubular member associated with that vent chamber become filled with extrudate over a region adjacent the end of the extrusion tool, thus forming the required water blocks. Such a pair of blocked passageways are shown symbolically at 30 in FIG. 3(b).
Apparatus will now be described which during extrusion automatically forms the water blocks in the passageways sequentially and at regular length intervals. This apparatus will be described in conjunction with the extrusion tool shown in FIG. 2; however, it is to be understood that such apparatus can be easily modified for use with the tool of FIG. 4 to form the water blocks in pairs.
Referring to FIGS. 5, each vent tube at the rear of the extrusion tool is connected by means of a small bore pipe such as 22 to the inlet of a respective camoperated vent valve 23. The vent valves are arranged in turn by a rotating cam 24.
The construction of each valve is shown in FIG. 6. Each valve comprises a housing 25 in which a springloaded position 26 is sliding fit. The piston has a portion of reduced diameter 27 provided with a piston valve 28 When the piston is in the lower position as shown, the small bore piping 22 is in communication with the atmosphere via the outlet 31, but when the piston is actuated by the cam 24 the pipe 22 is cut off from the atmosphere and brought solely into communication with a closed stopcock or with a vacuum pump via the outlet 29. When this occurs a water block is formed in the associated air passageway in the manner described.
During continuous extrusion the cam 24 is operated by means of a pulley, rotated by the center conductor which passes round the pulley as it travels towards the extrusion tool, and change gears. Thus the rotary speed of the cam is proportional to the speed of the center conductor, and can be preset by means of the change gears and the diameter of the pulley. By this means the length interval between water blocks may be changed.
What is claimed is:
1. Apparatus for manufacturing a coaxial cable having a dielectric formed by extrusion and a moving center conductor, comprising an extrusion tool having a plurality of longitudinally disposed members spaced about said center conductor, each member forming a longitudinal passageway in the extruded dielectric, a vent tube in each member which normally communicates at one end with the atmosphere and communicates during extrusion at the other end with the passageway formed in said dielectric extruded around the member, and means for sequentially interrupting the air flow and reducing the pressure in each vent tube at different times fromreachv other vent tube during extrusion to block each associated passageway with extruded dielectric over a region adjacent the end of the tool at longitudinal and circumferential locations along the cable different than each other passageway.
2. Apparatus as claimed in claim 1 wherein said means includes a plurality of vent valves, said vent tubes being connected to the inlets of respective valves, each vent valve being a first outlet in communication with the atmosphere and also normally with the inlet, a second outletin which air flow is interrupted and pressure reduced during extrusion, and actuating means which when operated connects the inlet solely with the second outlet.
3. Apparatus as claimed in claim 2, wherein the passageway-forming members are arranged symmetrically about the moving center conductor, the apparatus further including means to operate the vent valves in sequential order and at time intervals dependent upon the rate of extrusion.
4. Apparatus as claimed in claim 3, wherein the vent valve actuating means are cam-operated and the valves are arranged in a circular configuration with their actuating means facing the center of the circle, the apparatus also including a cam mounted for rotation about an axis at the center of the circle to actuate each valve in turn and driven at an angular speed proportional to the speed of the center conductor.
5. Apparatus as claimed in claim 4, wherein the cam includes drive means driven by the center conductor.
Claims (5)
1. Apparatus for manufacturing a coaxial cable having a dielectric formed by extrusion and a moving center conductor, comprising an extrusion tool having a plurality of longitudinally disposed members spaced about said center conductor, each member forming a longitudinal passageway in the extruded dielectric, a vent tube in each member which normally communicates at one end with the atmosphere and communicates during extrusion at the other end with the passageway formed in said dielectric extruded around the member, and means for sequentially interrupting the air flow and reducing the pressure in each vent tube at different times from each other vent tube during extrusion to block each associated passageway with extruded dielectric over a region adjacenT the end of the tool at longitudinal and circumferential locations along the cable different than each other passageway.
2. Apparatus as claimed in claim 1 wherein said means includes a plurality of vent valves, said vent tubes being connected to the inlets of respective valves, each vent valve being a first outlet in communication with the atmosphere and also normally with the inlet, a second outlet in which air flow is interrupted and pressure reduced during extrusion, and actuating means which when operated connects the inlet solely with the second outlet.
3. Apparatus as claimed in claim 2, wherein the passageway-forming members are arranged symmetrically about the moving center conductor, the apparatus further including means to operate the vent valves in sequential order and at time intervals dependent upon the rate of extrusion.
4. Apparatus as claimed in claim 3, wherein the vent valve actuating means are cam-operated and the valves are arranged in a circular configuration with their actuating means facing the center of the circle, the apparatus also including a cam mounted for rotation about an axis at the center of the circle to actuate each valve in turn and driven at an angular speed proportional to the speed of the center conductor.
5. Apparatus as claimed in claim 4, wherein the cam includes drive means driven by the center conductor.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US80017869A | 1969-02-18 | 1969-02-18 | |
US10559871A | 1971-01-11 | 1971-01-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3771934A true US3771934A (en) | 1973-11-13 |
Family
ID=26802730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00105598A Expired - Lifetime US3771934A (en) | 1969-02-18 | 1971-01-11 | Apparatus for extending water-blocked cartwheel cable |
Country Status (1)
Country | Link |
---|---|
US (1) | US3771934A (en) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4836968A (en) * | 1987-04-15 | 1989-06-06 | Sterling Engineered Products Inc. | Method of making fiber optic duct insert |
FR2747832A1 (en) * | 1996-04-23 | 1997-10-24 | Filotex Sa | METHOD AND DEVICE FOR MANUFACTURING A VENTILATED SHEATH IN AN INSULATING MATERIAL AROUND A CONDUCTOR, AND COAXIAL CABLE EQUIPPED WITH SUCH SHEATH |
US20040055779A1 (en) * | 2002-09-24 | 2004-03-25 | David Wiekhorst | Communication wire |
US20050139377A1 (en) * | 2003-12-31 | 2005-06-30 | Levy Daniel N. | Paste extruded insulator with air channels |
US20060288568A1 (en) * | 2004-08-27 | 2006-12-28 | Pascal Clouet | Device for fabricating a cellular sheath around a conductor |
US20070098940A1 (en) * | 2005-10-27 | 2007-05-03 | Greg Heffner | Profiled insulation LAN cables |
US20070182054A1 (en) * | 2006-01-12 | 2007-08-09 | Kachmar Wayne M | Method for manufacturing product markers |
US7271344B1 (en) | 2006-03-09 | 2007-09-18 | Adc Telecommunications, Inc. | Multi-pair cable with channeled jackets |
US20080296042A1 (en) * | 2007-05-31 | 2008-12-04 | Greg Heffner | Profiled insulation and method for making the same |
US20090011182A1 (en) * | 2003-12-12 | 2009-01-08 | Cambridge University Technical Services Limited | Extrudate Having Capillary Channels |
US20090025958A1 (en) * | 2002-09-24 | 2009-01-29 | Adc Incorporated | Communication wire |
US20090078439A1 (en) * | 2007-07-12 | 2009-03-26 | David Wiekhorst | Telecommunication wire with low dielectric constant insulator |
US7511225B2 (en) | 2002-09-24 | 2009-03-31 | Adc Incorporated | Communication wire |
US20090101381A1 (en) * | 2007-08-02 | 2009-04-23 | Axon'cable | Coaxial cable of low dielectric constant, and a fabrication method and tool therefor |
US20100000753A1 (en) * | 2008-07-03 | 2010-01-07 | Adc Telecommunications, Inc. | Telecommunications Wire Having a Channeled Dielectric Insulator and Methods for Manufacturing the Same |
US20100108355A1 (en) * | 2008-11-06 | 2010-05-06 | Axon'cable | Electric wire having a ptfe covering that is robust and that has a low dielectric constant, and a method and a tool for manufacturing the same |
US20110020574A1 (en) * | 2006-10-12 | 2011-01-27 | Cambridge Enterprise Limited | Extruded materials having capillary channels |
US8273185B2 (en) | 2009-07-25 | 2012-09-25 | Ceramex Limited | Cleaning a vehicle exhaust filter |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB191116542A (en) * | 1911-07-18 | 1912-07-18 | Willoughby Statham Smith | Improvements in the Covering of Electric Conductors with Plastic Material and in Apparatus therefor. |
US2690592A (en) * | 1951-04-27 | 1954-10-05 | Goodrich Co B F | Method of and apparatus for extruding tubing |
US2708176A (en) * | 1951-06-14 | 1955-05-10 | Us Rubber Co | Coaxial cable and method of making same |
GB811703A (en) * | 1954-07-12 | 1959-04-08 | Shardlow Electrical Wires Ltd | Electric cables and method of and means for manufacturing same |
-
1971
- 1971-01-11 US US00105598A patent/US3771934A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB191116542A (en) * | 1911-07-18 | 1912-07-18 | Willoughby Statham Smith | Improvements in the Covering of Electric Conductors with Plastic Material and in Apparatus therefor. |
US2690592A (en) * | 1951-04-27 | 1954-10-05 | Goodrich Co B F | Method of and apparatus for extruding tubing |
US2708176A (en) * | 1951-06-14 | 1955-05-10 | Us Rubber Co | Coaxial cable and method of making same |
GB811703A (en) * | 1954-07-12 | 1959-04-08 | Shardlow Electrical Wires Ltd | Electric cables and method of and means for manufacturing same |
Cited By (56)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4836968A (en) * | 1987-04-15 | 1989-06-06 | Sterling Engineered Products Inc. | Method of making fiber optic duct insert |
FR2747832A1 (en) * | 1996-04-23 | 1997-10-24 | Filotex Sa | METHOD AND DEVICE FOR MANUFACTURING A VENTILATED SHEATH IN AN INSULATING MATERIAL AROUND A CONDUCTOR, AND COAXIAL CABLE EQUIPPED WITH SUCH SHEATH |
EP0803878A1 (en) * | 1996-04-23 | 1997-10-29 | Filotex | Process and device for manufacturing an aerated casing made of insulating material around a conductor, and cable with such a casing |
US5922155A (en) * | 1996-04-23 | 1999-07-13 | Filotex | Method and device for manufacturing an insulative material cellular insulator around a conductor and coaxial cable provided with an insulator of this kind |
US7214880B2 (en) | 2002-09-24 | 2007-05-08 | Adc Incorporated | Communication wire |
US8624116B2 (en) | 2002-09-24 | 2014-01-07 | Adc Telecommunications, Inc. | Communication wire |
US11355262B2 (en) | 2002-09-24 | 2022-06-07 | Commscope Technologies Llc | Communication wire |
US20050167148A1 (en) * | 2002-09-24 | 2005-08-04 | Adc Incorporated Located | Communication wire |
US20050167146A1 (en) * | 2002-09-24 | 2005-08-04 | Adc Incorporated | Communication wire |
US10242767B2 (en) | 2002-09-24 | 2019-03-26 | Commscope Technologies Llc | Communication wire |
US9336928B2 (en) | 2002-09-24 | 2016-05-10 | Commscope Technologies Llc | Communication wire |
US8664531B2 (en) | 2002-09-24 | 2014-03-04 | Adc Telecommunications, Inc. | Communication wire |
US7560648B2 (en) | 2002-09-24 | 2009-07-14 | Adc Telecommunications, Inc | Communication wire |
US20100078193A1 (en) * | 2002-09-24 | 2010-04-01 | ADC Incorporation | Communication wire |
US7238886B2 (en) | 2002-09-24 | 2007-07-03 | Adc Incorporated | Communication wire |
US20040216913A1 (en) * | 2002-09-24 | 2004-11-04 | David Wiekhorst | Communication wire |
US8525030B2 (en) | 2002-09-24 | 2013-09-03 | Adc Telecommunications, Inc. | Communication wire |
US8237054B2 (en) | 2002-09-24 | 2012-08-07 | Adc Telecommunications, Inc. | Communication wire |
US20080066944A1 (en) * | 2002-09-24 | 2008-03-20 | Adc Incorporated | Communication wire |
US20040055779A1 (en) * | 2002-09-24 | 2004-03-25 | David Wiekhorst | Communication wire |
US20100132977A1 (en) * | 2002-09-24 | 2010-06-03 | Adc Telecommunications, Inc. | Communication wire |
US20090025958A1 (en) * | 2002-09-24 | 2009-01-29 | Adc Incorporated | Communication wire |
US7759578B2 (en) | 2002-09-24 | 2010-07-20 | Adc Telecommunications, Inc. | Communication wire |
US7511221B2 (en) | 2002-09-24 | 2009-03-31 | Adc Incorporated | Communication wire |
US7511225B2 (en) | 2002-09-24 | 2009-03-31 | Adc Incorporated | Communication wire |
US20090011182A1 (en) * | 2003-12-12 | 2009-01-08 | Cambridge University Technical Services Limited | Extrudate Having Capillary Channels |
US8641946B2 (en) * | 2003-12-12 | 2014-02-04 | Cambridge Enterprise Limited | Extrudate having capillary channels |
US20120067616A1 (en) * | 2003-12-31 | 2012-03-22 | E. I. Du Pont De Nemours And Company | Paste extruded insulator with air channels |
CN1902718B (en) * | 2003-12-31 | 2012-05-09 | 纳幕尔杜邦公司 | Paste extruded insulator with air channels, preparation method thereof and coaxial cable incorporating same |
US20050139377A1 (en) * | 2003-12-31 | 2005-06-30 | Levy Daniel N. | Paste extruded insulator with air channels |
US20070012467A1 (en) * | 2003-12-31 | 2007-01-18 | E. I. Du Pont De Nemours And Company | Paste extruded insulator with air channels |
JP2007520859A (en) * | 2003-12-31 | 2007-07-26 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー | Paste insulation with air channel |
US20100218968A1 (en) * | 2003-12-31 | 2010-09-02 | E. I. Du Pont De Nemours And Company | Paste Extruded Insulator with Air Channels |
US7740781B2 (en) | 2003-12-31 | 2010-06-22 | E.I. Du Pont De Nemours And Company | Paste extruded insulator with air channels |
US20060288568A1 (en) * | 2004-08-27 | 2006-12-28 | Pascal Clouet | Device for fabricating a cellular sheath around a conductor |
EP1783787A1 (en) * | 2005-10-27 | 2007-05-09 | Nexans | Profiled insulation LAN cables |
US7993568B2 (en) * | 2005-10-27 | 2011-08-09 | Nexans | Profiled insulation LAN cables |
CN101093740B (en) * | 2005-10-27 | 2013-02-06 | 尼克桑斯公司 | Profiled insulation LAN cables |
US20070098940A1 (en) * | 2005-10-27 | 2007-05-03 | Greg Heffner | Profiled insulation LAN cables |
US20070182054A1 (en) * | 2006-01-12 | 2007-08-09 | Kachmar Wayne M | Method for manufacturing product markers |
US7629536B2 (en) | 2006-03-09 | 2009-12-08 | Adc Telecommunications, Inc. | Multi-pair cable with channeled jackets |
US7271344B1 (en) | 2006-03-09 | 2007-09-18 | Adc Telecommunications, Inc. | Multi-pair cable with channeled jackets |
US20110020574A1 (en) * | 2006-10-12 | 2011-01-27 | Cambridge Enterprise Limited | Extruded materials having capillary channels |
US20080296042A1 (en) * | 2007-05-31 | 2008-12-04 | Greg Heffner | Profiled insulation and method for making the same |
US7560646B2 (en) | 2007-05-31 | 2009-07-14 | Nexans | Profiled insulation and method for making the same |
US20090078439A1 (en) * | 2007-07-12 | 2009-03-26 | David Wiekhorst | Telecommunication wire with low dielectric constant insulator |
US7816606B2 (en) | 2007-07-12 | 2010-10-19 | Adc Telecommunications, Inc. | Telecommunication wire with low dielectric constant insulator |
US8007700B2 (en) * | 2007-08-02 | 2011-08-30 | Axon'cable | Coaxial cable of low dielectric constant, and a fabrication method and tool therefor |
US20090101381A1 (en) * | 2007-08-02 | 2009-04-23 | Axon'cable | Coaxial cable of low dielectric constant, and a fabrication method and tool therefor |
US8641844B2 (en) | 2008-07-03 | 2014-02-04 | Adc Telecommunications, Inc. | Telecommunications wire having a channeled dielectric insulator and methods for manufacturing the same |
US8022302B2 (en) | 2008-07-03 | 2011-09-20 | ADS Telecommunications, Inc. | Telecommunications wire having a channeled dielectric insulator and methods for manufacturing the same |
US9870846B2 (en) | 2008-07-03 | 2018-01-16 | Commscope Technologies Llc | Telecommunications wire having a channeled dielectric insulator and methods for manufacturing the same |
US20100000753A1 (en) * | 2008-07-03 | 2010-01-07 | Adc Telecommunications, Inc. | Telecommunications Wire Having a Channeled Dielectric Insulator and Methods for Manufacturing the Same |
US20100108355A1 (en) * | 2008-11-06 | 2010-05-06 | Axon'cable | Electric wire having a ptfe covering that is robust and that has a low dielectric constant, and a method and a tool for manufacturing the same |
US8618417B2 (en) * | 2008-11-06 | 2013-12-31 | Axon'cable | Electric wire having a PTFE covering that is robust and that has a low dielectric constant, and a method and a tool for manufacturing the same |
US8273185B2 (en) | 2009-07-25 | 2012-09-25 | Ceramex Limited | Cleaning a vehicle exhaust filter |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3771934A (en) | Apparatus for extending water-blocked cartwheel cable | |
US3588313A (en) | Water-blocked cartwheel cable | |
US5922155A (en) | Method and device for manufacturing an insulative material cellular insulator around a conductor and coaxial cable provided with an insulator of this kind | |
FI61367C (en) | FOERFARANDE FOER FRAMSTAELLNING AV EN KOAXIALKABEL | |
US5122044A (en) | Apparatus for making a drip irrigation conduit | |
FI852312A0 (en) | FRAMSTAELLNING AV EN MATPRODUKT. | |
US7740781B2 (en) | Paste extruded insulator with air channels | |
FI58568C (en) | FOERFARANDE OCH ANORDNING FOER ATT PAOFOERA EN TVINNAD KAERNA HOS ETT LAONGSTRAECKT FOEREMAOL EN VATTENBESTAENDIG KOMPOSITION | |
US2708176A (en) | Coaxial cable and method of making same | |
US20230234287A1 (en) | 3d printing device with extrusion port having variable size and control method therefor | |
US3860179A (en) | Drip irrigation | |
US1992678A (en) | Manufacture of flexible tubes of artificial substances | |
EP0182420A1 (en) | Apparatus for and method of making the cable core of a telecommunication cable water-tight in the longitudinal direction | |
US1785037A (en) | Method of and apparatus for coating cores | |
US2284866A (en) | Arrangement for the manufacture of rubber hose | |
KR20060050654A (en) | A device for fabricating a cellular sheath around a conductor | |
GB1482661A (en) | Method of manufacturing an insulated conduit | |
US2897542A (en) | Apparatus for forming coaxial cables | |
JPH11138210A (en) | Extruding tool for indirect extrusion | |
FI71629B (en) | FRAMEWORK FOR THE FRAMEWORK OF FRAMEWORK FOR TELECOMMUNICATIONS | |
KR100484042B1 (en) | Method for manufacturing heat insulating pipes | |
SU87346A1 (en) | A method of manufacturing a coaxial high frequency cable | |
GB1462431A (en) | Apparatus for use in the manufacture of extruded cable covering | |
US3845549A (en) | Apparatus and process for the continuous manufacture of a waveguide formed by a cylindrical helix | |
WO2002103717A1 (en) | Capacitance controlling process |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: STC PLC,ENGLAND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:INTERNATIONAL STANDARD ELECTRIC CORPORATION, A DE CORP.;REEL/FRAME:004761/0721 Effective date: 19870423 Owner name: STC PLC, 10 MALTRAVERS STREET, LONDON, WC2R 3HA, E Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL STANDARD ELECTRIC CORPORATION, A DE CORP.;REEL/FRAME:004761/0721 Effective date: 19870423 |