US4473995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentric compressed double twist stranded cable
Assignee: Southwire Co LLC
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Filing: 1983-02-01
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Granted: 1984-10-02
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Expires: 2003-02-01
Abstract
Abstract A process for the manufacture of concentric compressed or compacted stranded conductors at high speed on double-twist bunching machinery while eliminating loose strand, strand crossovers, and spiral propensity of the finished product; and the product thereof.
Inventors
- 👤 Bobby C. Gentry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:15
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/02; H01B13/0221; D; D07; D07B; D07B3/00; D07B3/08; D07B3/10; H01B13/0006
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
66 words
A method of producing concentric compressed double twist stranded cable comprising the steps of: (a) reducing the diameters of each wire of a first group of individual wires; (b) guiding said first group of wires onto the outer surface of a core wire; and (c) compressing said first group of wires into a concentric first layer on said core wire to form a seven wire core.
Claim 2
Independent Claim
66 words
A method of producing concentric compressed double twist stranded cable comprising the steps of: (a) reducing the diameters of each wire of a first group of individual wires; (b) guiding said first group of wires onto the outer surface of a core wire; and (c) compressing said first group of wires into a concentric first layer on said core wire to form a seven wire core.
Claim 3
Dependent Claim
62 words
The method of claim 1 further comprising the steps of: (d) reducing the diameters of each wire of a second group of individual wires; (e) guiding said second group of wires onto the outer surface of said seven wire core; and, (f) compressing said second group of wires into a concentric second layer on said first layer to form a 19-wire cable.
Claim 4
Independent Claim
160 words
A method of producing concentric compressed double twist stranded cable comprising the steps of: (a) causing the diameter of each wire of a first group of individual wires to conform to the following equation: ##EQU6## where D 2 is the diameter of each wire of said first group of wires and D c is the maximum diameter of a seven wire core to be formed from said first group of wires; (b) guiding said first group of wires onto the outer surface of a core wire; (c) compressing said first group of wires into a concentric first layer on said core wire to form a seven wire core; (d) altering the diameters of each wire of a second group of individual wires; (e) guiding said second group of wires onto the outer surface of said seven wire core; and (f) compressing said second group of wires into a concentric second layer on said first layer to form a 19-wire cable.
Claim 5
Independent Claim
160 words
A method of producing concentric compressed double twist stranded cable comprising the steps of: (a) causing the diameter of each wire of a first group of individual wires to conform to the following equation: ##EQU6## where D 2 is the diameter of each wire of said first group of wires and D c is the maximum diameter of a seven wire core to be formed from said first group of wires; (b) guiding said first group of wires onto the outer surface of a core wire; (c) compressing said first group of wires into a concentric first layer on said core wire to form a seven wire core; (d) altering the diameters of each wire of a second group of individual wires; (e) guiding said second group of wires onto the outer surface of said seven wire core; and (f) compressing said second group of wires into a concentric second layer on said first layer to form a 19-wire cable.
Claim 6
Dependent Claim
71 words
The method of claim 3 wherein step (d) further comprises the step of: (h) causing the diameter of each wire of said second group of wires to conform to the following equation: ##EQU7## where D 1 is the diameter of each wire of said second group of wires, D f is the minimum diameter of said 19-wire cable, and X equals a specific percentage which varies as the cable diameter varies.
Claim 7
Dependent Claim
38 words
The method of claim 4 wherein X is 3.3% for cable size AWG 6 and is increased by 0.1% for each AWG increase from AWG 6 and is decreased by 0.1% for each AWG decrease from AWG 6.
Claim 8
Dependent Claim
71 words
The method of claim 3 wherein step (c) further comprises the step of: (i) causing said seven wire core to assume a maximum diameter conforming to the following equation: ##EQU8## where D c is the maximum diameter of said seven wire core, D 1 is the minimum diameter of the individual strands of said second group of wires, and N is a specific factor which varies as the cable diameter varies.
Claim 9
Dependent Claim
38 words
The method of claim 6 wherein N equals 12.5 for cable size AWG 6 and is decreased by 0.1 for each AWG increase from AWG 6 and is increased by 0.1 for each AWG decrease from AWG 6.
Claim 10
Dependent Claim
34 words
The method of claim 6 further comprising the step of: (j) forming an insulating covering over said compressed second layer, further provided that the volume of insulating material required is decreased by about 3.5%.
Claim 11
Dependent Claim
26 words
A concentric compressed stranded conductor formed by the method of claim 8 and characterized by substantially tight strand, substantially no strand crossovers and substantially linear propensity.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |