US3884025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making SZ-twisted communications cable
Assignee: Siemens AG
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Filing: 1973-08-10
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Granted: 1975-05-20
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Expires: 1993-08-10
Abstract
Abstract An improved communications cable and a method of making the same so as to minimize cross talk between units within the cable, in which a plurality of SZ stranded units are twisted to form groups which are then formed into layers so that adjoining units in any one layer have a different distribution function of length of lay and/or distance of reversal points of twist directions and with adjacent units in one layer similarly have different distribution function of length of lay and/or distance between reversal points than units in adjacent layers.
Inventors
- 👤 Heinz Oberender
- 👤 Dieter Vogelsberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:36
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/02; H01B13/0235; H01B13/0264
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
220 words
A method for manufacturing communication cable which is made up of at least two layers of twisted cable units comprising the steps of: a. twisting a plurality of stranding elements to form a plurality of cable units, each having an SZ twist in essentially identical separate twisting devices in which the stranding elements are formed into a strand which is held in a stretched condition between a fixed entrance point and a fixed exit point, said twist-device having a twisting head which grasps the strand perpendicular to its axis between said entrance and exit points with said twisting head arranged so that the distance between the exit point and the point of attack of the twisting head is smaller than the distance between the point of attack of the twisting head and the entrance point; b. twisting the units so formed in series therewith to form a twisted group; and c. switching the process parameters affecting the twisting of the strand of every other twisting device forming said units at the same time at intervals which are smaller than three times the time required for a length element of strand to move from the first fixed point to the twisting head at one of a rate and a phase which is different from the switching of the remaining twisting devices.
Claim 2
Independent Claim
220 words
A method for manufacturing communication cable which is made up of at least two layers of twisted cable units comprising the steps of: a. twisting a plurality of stranding elements to form a plurality of cable units, each having an SZ twist in essentially identical separate twisting devices in which the stranding elements are formed into a strand which is held in a stretched condition between a fixed entrance point and a fixed exit point, said twist-device having a twisting head which grasps the strand perpendicular to its axis between said entrance and exit points with said twisting head arranged so that the distance between the exit point and the point of attack of the twisting head is smaller than the distance between the point of attack of the twisting head and the entrance point; b. twisting the units so formed in series therewith to form a twisted group; and c. switching the process parameters affecting the twisting of the strand of every other twisting device forming said units at the same time at intervals which are smaller than three times the time required for a length element of strand to move from the first fixed point to the twisting head at one of a rate and a phase which is different from the switching of the remaining twisting devices.
Claim 3
Dependent Claim
181 words
Apparatus for forming a twisted communication cable comprising: a. a plurality of SZ twisting devices each having a first fixed entrance point wherein a plurality of elements are formed into a strand and held in a stretched manner between said first fixed point and a second fixed exit point with a twisting head between said first and second fixed points with the distance between the point of attack of said twisting device and said exit point smaller than the distance between said point of attack and the entrance point, said twisting head being such as to surround its respective strand gripping said strand in a circumferential direction; b. first means to twist a first plurality of the units formed by said twisting devices into a first group; c. second means having a twisting axis coincident with the first means to twist a second plurality of said units in a second layer over said first group; and d. wherein the twisting devices associated with each of said first and second means for twisting are arranged in planes perpendicular to the axes thereof.
Claim 4
Dependent Claim
181 words
Apparatus for forming a twisted communication cable comprising: a. a plurality of SZ twisting devices each having a first fixed entrance point wherein a plurality of elements are formed into a strand and held in a stretched manner between said first fixed point and a second fixed exit point with a twisting head between said first and second fixed points with the distance between the point of attack of said twisting device and said exit point smaller than the distance between said point of attack and the entrance point, said twisting head being such as to surround its respective strand gripping said strand in a circumferential direction; b. first means to twist a first plurality of the units formed by said twisting devices into a first group; c. second means having a twisting axis coincident with the first means to twist a second plurality of said units in a second layer over said first group; and d. wherein the twisting devices associated with each of said first and second means for twisting are arranged in planes perpendicular to the axes thereof.
Claim 5
Dependent Claim
51 words
The invention according to claim 2, wherein the plurality of twisting devices associated with each of said first and second twisting means are in the same place and further including means to switch every other twisting device at a point in time different from the switching of the remaining twisting devices.
Claim 6
Dependent Claim
50 words
The invention according to claim 2, wherein the twisting devices associated with one of said first and second means for twisting are displaced with respect to each other to the direction of the twisting axis and further including means to switch all of said associated devices at the same time.
Claim 7
Dependent Claim
78 words
The invention according to claim 4, wherein the twisting devices associated with said first means for twisting are displaced from the twisting devices associated with said second means for twisting by more than 5 percent of the length of a section of the stranded units produced in said twisting devices having a constant twist direction and further including means to switch the twisting devices associated with said first and second twisting means at the same point in time.
Claim 8
Dependent Claim
65 words
The invention according to claim 5, wherein at least some of said plurality of twisting devices comprise two twisting heads arranged in tandem, one of which rotates and always grasps the stranding elements with a friction force and the other of which is stationary and includes means to cause it to grasp the stranding elements with a friction force which changes from section to section.
Claim 9
Dependent Claim
38 words
The invention according to clAim 2, wherein the twisting devices associated with said first means for twisting are arranged in a plane which is different than the plane of the twisting devices associated with said second twisting means.
Claim 10
Dependent Claim
36 words
The invention according to claim 2, wherein said second means for twisting is mounted for back and forth motions in the direction of the twisting axis for modulating the length of lay of the twisting layer.
Claim 11
Dependent Claim
35 words
The invention according to claim 2 and further including third means for twisting in tandem with said second means for twisting and adapted to modulate the length of lay of the twisting layer formed thereby.
Claim 12
Dependent Claim
38 words
The invention according to claim 9, wherein said third means for twisting comprises a twisting head which grasps the twisting layer strand with a frictional force and includes means to change its rotary motion from section to section.
Claim 13
Dependent Claim
33 words
The invention according to claim 9, wherein said third means for twisting comprises a second twisting head which includes means to cause it to alternatingly grasp said twisting layer with a friction force.
Claim 14
Dependent Claim
27 words
The invention according to claim 9 wherein said third means for twisting comprises a revolving accumulator with means to change its rotary motion from section to section.
Claim 15
Dependent Claim
24 words
The invention according to claim 12, wherein said twisting devices are arranged in a circle about said twisting axis of said second twisting means.
Claim 16
Dependent Claim
34 words
The invention according to claim 2, wherein the twisting devices associate with said second twisting means are arranged so that they can be rotated together about the twisting axis of said second twisting means.
Claim 17
Dependent Claim
41 words
The invention according to claim 2, wherein the distances between the entrance point of a twisting device and its twisting head and between said twisting head and the exit point of said twisting device is the same for all twisting devices.
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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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |