U.S. patent application number 10/547992 was filed with the patent office on 2007-02-15 for method for producing a cable.
Invention is credited to Roland Verreet.
Application Number | 20070036974 10/547992 |
Document ID | / |
Family ID | 32892098 |
Filed Date | 2007-02-15 |
United States Patent
Application |
20070036974 |
Kind Code |
A1 |
Verreet; Roland |
February 15, 2007 |
Method for producing a cable
Abstract
It is a known practice to hammer cables for specific
applications that require a smooth surface for the cable. Notches
in the cable and breaks that soon arise as a result of said notches
are accepted. To prevent cable damage of this type, an intermediate
layer consisting of a thermoplastic plastic is applied to the core
cable or core strand prior to the stranding process and the outer
strand layer is pressed into the heated plastic during said
stranding process. It has been demonstrated that this type of
support for the outer strands does not impair the hammering process
or the desired deformation. Notches in intersecting cable strands
do not occur. The plastic intermediate layer acts in a similar
manner to a sealed liquid, in which the pressure prevails on all
sides, resisting the hammer blows that impact simultaneously from
different sides and preventing increased forces from being produced
between the intersecting cable strands. A cable comprising a core
consisting of a plastic strand can also be hammered if necessary in
such a manner.
Inventors: |
Verreet; Roland; (Aachen,
DE) |
Correspondence
Address: |
FRIEDRICH KUEFFNER
317 MADISON AVENUE, SUITE 910
NEW YORK
NY
10017
US
|
Family ID: |
32892098 |
Appl. No.: |
10/547992 |
Filed: |
March 11, 2004 |
PCT Filed: |
March 11, 2004 |
PCT NO: |
PCT/EP04/02516 |
371 Date: |
June 13, 2006 |
Current U.S.
Class: |
428/375 |
Current CPC
Class: |
D07B 7/16 20130101; D07B
2201/2074 20130101; D07B 1/068 20130101; Y10T 428/2933 20150115;
D07B 1/0693 20130101; D07B 5/007 20130101; D07B 1/165 20130101;
D07B 5/005 20130101; D07B 1/16 20130101; D07B 7/027 20130101; D07B
2201/1036 20130101 |
Class at
Publication: |
428/375 |
International
Class: |
D02G 3/00 20060101
D02G003/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 11, 2003 |
DE |
10310855.6 |
Claims
1. Method for producing a wire cable with a core cable or core
strand, in which, after the outer strand layer has been stranded,
the wire cable is hammered to smooth its surface and/or to increase
its space factor, wherein an intermediate layer of a plastic
material is applied to the core cable or core strand before the
outer layer of strands is stranded, and the outer layer of strands
is pressed into the plastic during the stranding process.
2. Method for producing a wire cable with a core that consists of a
plastic strand, on which a layer of strands is stranded, wherein
the wire cable is hammered after the stranding of the strand
layer.
3. Method in accordance with claim 1, wherein a thermoplastic is
used for the intermediate layer, which is preferably heated during
the process of stranding the outer strand layer.
4. Method in accordance with claim 1, wherein standard strands with
a core wire and one wire layer or parallel-lay strands are used for
the outer strand layer.
5. Method in accordance with claim 1, wherein strands with readily
deformable core, especially a core of soft iron or plastic, e used
for the outer strand layer.
6. Method in accordance with claim 1, wherein preferably four
hammers are used for the hammering, which are moved towards the
wire cable from different sides and essentially completely surround
it with adapted curvatures at the instant of their simultaneous
impact.
7. Method in accordance with claim 1, wherein hammers are used
which have an axial extent of at least twice the cable diameter and
preferably have an expanded, tapering inlet.
8. Method in accordance with claim 1, wherein after it has en
hammered, the wire cable is subjected to a surface treatment or
ated or provided with a sheath.
9. Wire cable, which is hammered to smooth its surface and/or to
compress it, wherein it has a plastic intermediate layer (4) or a
plastic core beneath the hammered outer strand layer (5).
10. Wire cable in accordance with claim 9, wherein the outer strand
layer (5) consists of standard strands (6) with a core wire and
only one wire layer or parallel-lay strands.
Description
[0001] The invention concerns a method for producing a wire cable
with a core cable or core strand, in which, after the outer strand
layer has been stranded, the wire cable is hammered to smooth its
surface and/or to increase its space factor.
[0002] Wire cables of this type are well known for special
applications in which a smooth surface of the wire cable is of
prime importance, e.g., because they are dragged over the ground.
An example of such applications is the lumber industry.
[0003] Without hammering, individual protruding wires would quickly
break at the surface, which would lead to operational disruptions,
increase the risk of accidents, and make the cable unusable.
Notches in the cable produced by hammering and the internal wire
breaks that soon occur as a result of this notching are accepted as
a tradeoff.
[0004] The objective of the invention is to prevent wire damage
caused by hammering to the greatest possible extent.
[0005] In accordance with the invention, this objective is achieved
by applying an intermediate layer of a plastic material to the core
cable or core strand before the outer layer of strands is stranded
and by pressing the outer layer of strands into the plastic during
the stranding process.
[0006] It was found that the support of the outer strands on the
elastic plastic does not impair the hammering and the desired
deformations. In a hammer works in which hammers adapted to the
curvature of the surface of the cable strike simultaneously from
different sides and essentially completely surround the surface of
the cable at the instant of their simultaneous striking of the
surface of the cable on an axial length of at least twice the cable
diameter, the plastic apparently does not have enough time or space
to escape from under the blow. The cavities between the outer layer
of strands and the core cable or core strand are preferably filled
with the plastic as far as the wedge-shaped spaces between the
wires bounding these cavities.
[0007] Deformation of the outer strands occurs, more or less
excluding those cross-sectional regions of the wire on the
underside that are surrounded by the plastic and receive the
counterpressure of the plastic everywhere perpendicular to their
surface; they are thus not exposed to any deforming forces here.
Directed forces, which deform the wires, occur on the upper side of
these wires, which is not surrounded by plastic. Under these
conditions, very strong deformation of the outer strands is
possible. If the outer strands constitute a large portion of the
cable diameter, reductions of the diameter of the wire cable of
more than 10% can be achieved. A 5% reduction of the diameter can
probably be achieved in most cases.
[0008] Deformation of the core cable or the core strand, the latter
to a lesser extent, continues similarly towards the inside to a
diminished extent but in the opposite way: Here, the outer wires
remain essentially unchanged on the outside and are deformed on the
inside, including the remaining strand cross section, such that the
deformation more or less continues further into the interior of the
cable.
[0009] Essentially no notches occur at intersecting wires of the
core cable or the core strand, on the one hand, and of the outer
strands, on the other hand.
[0010] The plastic intermediate layer does not really act as direct
cushioning between these wires, but rather the conditions are
comparable to a confined liquid, in which the pressure is exerted
towards all sides, so that no significantly increased forces at all
arise between the intersecting wires.
[0011] In accordance with the invention, it is possible to produce
wire cables with an extraordinarily high metal cross section that
have no internal damage and, in addition, have a very smooth
surface.
[0012] It is also possible to produce a wire cable with great
structural stability due to close denticulation of the outer strand
layer with the core cable or the core strand by the elastic
intermediate plastic layer and at the same time greater compression
than is possible by other methods, such as compression of a core
cable by rolling.
[0013] On the other hand, if it is desired that the denticulation
be reduced, it is possible to use a core cable with smoothed outer
strands or a smooth core strand.
[0014] The aforementioned compression of an outer strand layer on
an elastic substrate made of plastic in accordance with the
invention can also be realized in a wire cable with a core that
consists exclusively of a plastic strand: here too, the wire cable
can be hammered after the stranding of the strand layer, and thus
the strand layer can be compressed and smoothed.
[0015] The wire cable receives a higher space factor and becomes
resistant to surface wear, especially when running over
rollers.
[0016] As a rule, standard strands with a core wire and only one
wire layer or parallel-lay strands are used for the outer strand
layer, since they have no wire intersections.
[0017] However, it is also possible to use strands with a readily
deformable core, e.g., a core of soft iron or plastic.
[0018] As has already been hinted, it is advantageous to use
preferably four hammers for the hammering, which are moved towards
the wire cable from different sides and essentially completely
surround it with adapted curvatures at the instant of their
simultaneous impact.
[0019] In addition, the hammers should have an axial extent of at
least twice the cable diameter and preferably should have an
expanded, tapering inlet.
[0020] If there should be a need for it, after it has been
hammered, a wire cable of the invention could additionally be
subjected to a surface treatment or coated or provided with a
sheath.
[0021] The wire cable can also serve as the core cable for the
production of a wire cable, which then has, for example, an
additional counterwound strand layer on the smooth surface.
[0022] The cross-sectional drawing shows an embodiment of a wire
cable produced in accordance with the invention.
[0023] A core cable 1, which consists of a central core strand 2
(1+6) and six strands 3 (1+6), is surrounded by a thermoplastic
4.
[0024] During the stranding process on the core cable 1, an outer
strand layer 5 that consists of six strands 6 (1+6) is pressed into
the plastic 4, which has been softened by heating.
[0025] The wire cable produced in this way was hammered in the
manner described above.
[0026] During this treatment, the outer strands 6 were strongly
deformed. However, on their underside,-the wire cross-sectional
sections 8 that lie in the plastic 4, i.e., that lie below the
dot-dash line 7, are largely preserved in their original form.
[0027] The core cable 1 was also somewhat deformed and compressed,
but this occurred to only a slight extent in this case and is not
shown in the drawing.
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