Process of and Apparatus for Covering Metallic Wires with Asbestos, for Insulating and other purposes.
Year: 1898

page_text: Date of Application (in United Kingdom), 14th May, 1898
Complete Specification Left, 14th May, 1898-Accepted, 25th June, 1898
COMPLETE SPECIFICATION.
Process of and Apparatus for Covering Metallic Wires with Asbestos,
for Insulating and other purposes.
1, ETTORE ALBASINI, of Piazza Statuto No. 3, Turin, in the Kingdom of Italy,
do hereby declare the nature of this invention and in what manner the same is
to be performed to be particularly described and ascertained in and by the follow-
ing statement:—
It is known that asbestos would be the best material for covering metallic wires
intended for the electrical transmission, and other applications requiring a good
insulation, such as the winding of bobbins for electrical machines and apparatus,
telephones, telegraphs or the like but it is however also known that the applica-
tion of asbestos to such a use has been, as yet prevented by the excessive cost of
the employment of said insulation in the usual form of threads by plaiting or
twisting which take the place of the cotton, silk or like covering.
The principle of the present invention is to render practicable the application
of asbestos to said uses employing it not in the form of threads but in the natural
state of the sliver which is obtained by working it with a comb.
To attain this result I cause the wire to be covered to pass immediately below
the sliver of asbestos, which is developed from the combing cylinder of the card-
ing machine under the stroke of the comb (or other similar doffing mechanism)
and parallel to said sliver; the sliver of asbestos then attaches itself by wrapping
iteelf around said wire.
This attained it is necessary that the sliver of asbestos wrapped around the wire
should adhere well to this in order to form a perfect covering compact and even.
To this end an apparatus or suitable cylindrical tool serves, represented as an
example in the hereto annexed drawing in which Fig. 1 is a longitudinal section
and Fig. 2 a transverse section of the same tool.
Such an apparatus consists essentially in a cylinder A, A, having a bore in the
form of a cone B along its axis and revolving within a bearing C, C. To this
cylinder is joined solidly a pulley D, D, likewise bored conically with relation to
its axis integral with which is a metal plate E E in like manner conically bored
relatively to its axis and upon which are mounted three or more small conical
rollers as F, F, F.
The disposition of these small rollers, which can be caused to approach one
another more or less by means of screws or otherwise is such that the space enclosed
by them forms a continuation of the conical bores just referred to with which the

page_text: said cylinder, pulley and plate are furnished; these cylinders moreover can each
turn around a longitudinal axis with which it is furnished.
The tool is applied to the carding machine being arranged at one of the
extremities of the comb and put in motion by means of the pulley D above
described; then the metallic wire which will be caused to pass in from the other
side of the comb after being passed beneath said comb being covered by the sliver
of asbestos, will be introduced (as seen in Fig. 1 of the drawing) into the conical
bores above described by which means its covering formed of said sliver will
acquire by degrees evenness and compactness.
This compactness will then lastly be increased up to the desired limit of action
of the compressing cylinders F, F, F, and might contingently even be increased
further by wetting the wire as it passes out (or by the absorption of adhesive sub-
stances.
The longitudinal flow of wire along the sliver and through the apparatus above
described will be determined by one of the usual means which are employed for
obtaining similar results and namely either by drawing by means of revolving
pressure rolls or by means of a winding bobbin or the like.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
1. The process of covering metallic wire with fibrous asbestos as it comes direct
from the carding machine consisting in causing the wire to pass beneath the doff-
ing comb in such manner that the sliver of fibrous asbestos falls upon the wire
and in causing the said fibrous asbestos to adhere around said wire in a compact
and even manner by the application of a gradual and progressive pressure.
2. An apparatus or machine adapted to cause a sliver of fibrous asbestos as it
comes direct from the carding machine to wrap itself or be fed around a metallic
wire and then to adhere firmly to said wire in a uniform and compact manner by
the application of a gradually increasing pressure substantially as set forth.
3. An apparatus consisting of a revolving cylinder provided with a more or
less conical bore means for revolving said cylinder and 3 or more conical rollers
adjustably mounted on said cylinder in such manner that the space enclosed
between said conical rollers forms a prolongation of the conical bore in said
cylinder substantially as described and for the purposes set forth.
גד
T
.
1000
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.