US 4,974,408 A · Alternate reverse twisting method and apparatus

Abstract

An alternate reverse or so-called SZ-twisting method and apparatus and cable product produced by alternate reverse twisting method and/or apparatus. Elements (2 ) which are to be alternately reversely twisted may be wires, leads, optical fibers, their groups and which can also include quads of wires, leads, optical fibers. Elements (2) to be twisted and a possible core element (9) are drawn from a fixed divider (3), preferably a perforated holeplate, through a twister (6), preferably a perforated holeplate, rotating periodically in opposite directions, to a presser (7), preferably a nipple, in which the elements to be twisted and the possible core element are pressed together, to form an alternately reversely twisted product (8). Between the divider (3) and the twister (6) pipe group (4, 5) is provided for defining the feedpaths of the elements (2) to be twisted and the possible core element (9). The pipe group includes both a centrally located central pipe (5) for defining the feedpath of the possible core element and several peripheral pipes (4) for defining the feedpaths of said elements to be twisted, which peripheral pipes circumferentially surround the central pipe and are periodically twistable in opposite directions around and against the central pipe.

Claims19

Dependent claims

An alternate reverse twisting method to form a cable-type product, comprising at least one inner core element (9) and alternate reversely twisted elongated elements (2) to be treated by twisting as quads of wires, by an alternate reverse twisting apparatus, comprising:

applying the elements (2, 9) to fixed dividing means (3) at the input end of the elements (2, 9) to be treated;
periodically rotating twisting means (6) in opposite directions at the output end of the treated elements (2, 9);
pressing with pressure means (7) the treated elements (2, 9) tightly against each other;
and defining feedpaths for the elements (2, 9) to be treated concentrically between the dividing means (3) and twisting means (6) and supported by first and second means (4, 5);
drawing the elongate elements (2) to be twisted from said dividing means (3) to said pressing means (7) inside said first means composed of torsion-elastic peripheral pipes (4), which are bound side by side in close vicinity to each other to form an essentially uniform pipe mantle around said second means comprising an oscillating rotatable and/or twistable central pipe (5), which is supported by both said dividing means (3) and twisting means (6), so that said elongate elements (2) are adapted to pass through said peripheral pipes (4) which are twisted periodically into one direction at least 10 turns around and against said central pipe (5).

2 more elements

An alternate reverse twisting apparatus to form a cable product comprising at least one inner core element (9) and alternate reversely twisted elongated elements (2) to be treated by twisting as quads of wires, said apparatus comprising:

fixed dividing means (3) at the input end of the elements (2, 9) to be treated;
rotating twisting means (6) at the output end of the treated elements (2, 9) to rotate the treated elements periodically in opposite directions;
pressing means (7) for pressing said treated elements (2, 9) tightly against each other;
first and second means (4, 5) for defining feedpaths for said elements (2, 9) to be treated, and means supporting said first and second means concentrically between said dividing and twisting means (3, 6);
said first and second means for defining the feedpaths being support and guide pipes (4, 5) for said elements (2, 9) to be treated and include:
an oscillating central pipe (5) supported by both said twisting means (6) and said dividing means (3);
torsion-elastic peripheral pipes (4), one end of each of said peripheral pipes being supported by said dividing means (3) and the other end of each of said peripheral pipes being supported by said twisting means (6) for periodically twisting in opposite directions, and said peripheral pipes being elastically joined side by side in close vicinity to each other to form an essentially uniform pipe mantle around said central pipe (5) and during each twisting stage of said peripheral pipes, first into one direction and then into the opposite direction being side by side against the periphery of said central pipe (5);
and
means passing each of said at least one inner core element (9) to be twisted between said dividing means (3) and said twisting means (6) individually through said central pipe (5).

6 more elements

Dependencies are inferred from the claim text.

Alternate reverse twisting method and apparatus

Life of this patent

Alternate reverse twisting method and apparatus

Life of this patent

Abstract

Claims19