US3909177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for manufacturing polyolefin-insulated cables
Assignee: Fujikura Ltd
•
Filing: 1974-08-29
•
Granted: 1975-09-30
•
Expires: 1994-08-29
Abstract
Abstract An apparatus for manufacturing hardened polyolefin-insulated cables comprising a hardenable polyolefin-extruding device, a tube partitioned into heating and cooling zones by way of a certain partition area, for example, an area composed of a seal packing, the two zones being filed with circulating silicone oil and constituted of different circulating systems, through which the polyolefin-covered cable core is drawn, and a die provided at the other end of the curing tube and connected to a super-cooling device, where the pressurized oil is super-cooled to increase its density to such extent that the clearance between the outer surface of the cable core and the inner wall surface of the passage in the die is sealed.
Inventors
- 👤 Michio Takaoka
- 👤 Hiroto Oshima
- 👤 Toshiharu Katsuhara
- 👤 Motoyuki Ono
- 👤 Hideo Sano
- 👤 Masaichiro Seki
- 👤 Masakazu Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:26
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/91; B29C48/022; B29C48/03; B29C48/06; B29C48/78; B29C48/86; B29C48/865; B29C48/87; B29K; B29K2101/00; B29K2101/10; B29K2301/00; B29K2301/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
AN APPARATUS FOR MANUFACTURING ELECTRIC CONDUCTING CABLES INSULATED WITH A HARDENED POLYOLEFIN WHICH COMPRISES A TUBE PARTITIONED INTO A HEATING ZONE FILLED WITH A HEAT TRANSFER MEDIUM AND A COOLING ZONE FILLED WITH A COLLING MEDIUM, SEPERATE CIRCULATION SUSTEMS FOR SAID HEAT TRANFER AND COOLING MEDIA, A PRESSURE REGULATING MEANS CONNECTED TO EACH OF SAID CIRCULATION SYSTEM, AND A DIE ARRANGED IN ALIGNMENT JUST AFTER THE OUTLET OF SAID TUBE AND FILLED WITH THE SAME COOLING MEDIUM AS IN SAID COOLING ZONE OF SAID TUBE, AND A SUPER-COOLING MEANS CONNECTED TO SAID DIE TO SUPERCOOL SAID MEDIUM THEREIN SO THAT THE SUPERCOOLED MEDIUM WORKS TO SEAL THE CLEARANCE BETWEEN THE OUTER SURFACE OF A PASSING INSULATED CABLE CORE AND THE INNER WALL SURFACE OF THE PASSAGE IN SAID DIE.
Claim 2
Independent Claim
129 words
AN APPARATUS FOR MANUFACTURING ELECTRIC CONDUCTING CABLES INSULATED WITH A HARDENED POLYOLEFIN WHICH COMPRISES A TUBE PARTITIONED INTO A HEATING ZONE FILLED WITH A HEAT TRANSFER MEDIUM AND A COOLING ZONE FILLED WITH A COLLING MEDIUM, SEPERATE CIRCULATION SUSTEMS FOR SAID HEAT TRANFER AND COOLING MEDIA, A PRESSURE REGULATING MEANS CONNECTED TO EACH OF SAID CIRCULATION SYSTEM, AND A DIE ARRANGED IN ALIGNMENT JUST AFTER THE OUTLET OF SAID TUBE AND FILLED WITH THE SAME COOLING MEDIUM AS IN SAID COOLING ZONE OF SAID TUBE, AND A SUPER-COOLING MEANS CONNECTED TO SAID DIE TO SUPERCOOL SAID MEDIUM THEREIN SO THAT THE SUPERCOOLED MEDIUM WORKS TO SEAL THE CLEARANCE BETWEEN THE OUTER SURFACE OF A PASSING INSULATED CABLE CORE AND THE INNER WALL SURFACE OF THE PASSAGE IN SAID DIE.
Claim 3
Dependent Claim
20 words
The apparatus according to claim 1 wherein said heating and cooling zones are partitioned by means of a seal packing.
Claim 4
Dependent Claim
40 words
The apparatus according to claim 1 wherein said heating and cooling zones are partitioned by a buffer area within which said heat transfer and cooling media are in contact with each other and surrounding which a water jacket is provided.
Claim 5
Dependent Claim
23 words
The apparatus according to claim 1 wherein said cooling medium in said die is super-cooled to a temperature of from -20* to -40*C.
References Cited (Backward Citations)
US2069087A
Cited
US2540497A
Cited
US2581230A
Cited
US2561820A
Cited
US3513228A
Cited
US3659987A
Cited
US3635621A
Cited
US3645656A
Cited
US3859247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |