Process for Forming a Conducting Connection between Electrical Incandescence Bodies of Second Class Conductors with Conductors of the First Class.
Year: 1899

page_text: Date of Application, 13th Sept., 1899-Accepted, 28th Oct., 1899
COMPLETE SPECIFICATION.
Process for Forming a Conducting Connection between Electrical
Incandescence Bodies of Second Class Conductors with Conductors
of the First Class.
We, SIEMENS BROTHERS & Co. LIMITED, of 12, Queen Anne's Gate, West-
minster, in the County of London, Electrical Engineers, do hereby declare the
nature of this invention (as communicated to us from abroad by Siemens & Halske,
Aktien, Gesellschaft, of Markgrafen Strasse, No. 94, Berlin, Germany, Electrical
Engineers), and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
-
This invention relates to a process for effecting an electrical conducting con-
nection between conductors of the first class and conductors of the second class
for electrical glow lamps consisting of conductors of the second class.
The said process consists essentially in subjecting the ends of the said incan-
descence bodies of the second class to the action, under repeated heating to
incandescence, of a suitable metalloid, or a compound thereof free from oxygen,
or a refractory metal, or an alloy or compound thereof, free from oxygen, so that
the end of the said incandescence body becomes impregnated with the said
substance.
The ends of the incandescence bodies are thereby rendered plastic so that a
metal wire, strip, tube &c., con be simply pressed into it, whereupon on cooling,
it will be firmly secured to the body and form a perfectly conducting connection
For carrying out the above described process, the following materials have been
found suitable. In the first place the metalloids boron and silicon, as also their
oxygen freed compounds in the form of powder, for example the nitrides and
carbides. Furthermore, the refractory metals such as manganese, molybdenum,
chromium titanium, nickel, also the platinum metals and their alloys.
The said metals in their solid combinations with oxygen-freed metalloids may
also be used, such as sulphides, phosphides, nitrides, carbides, and the like, in so
far as the said metalloids and metals will form such compounds.
In carrying out the invention practically the ends of the second class con-
ductors are consecutively heated to a white heat by means of an oxyhydrogen
flame or other suitable source of heat, and then plunged in such heated condition
in to the pulverulent material, which adheres to the said incandescence body.
The end of the body thus coated with the substance is again heated to white heat
and again dipped into the powder, and so on.
This process is repeated four or five times, or till, under the action of the
source of heat, the ends of the second class conductors form a plastic mass with
the absorbed substance, so that the first class conductor can then be pushed into
it by moderate pressure. The process may also be carried out by preparing the
said substance in the form of a paste by mixing with water, neutral oil, or hydro-
carbon, and then applying it to the ends of the incandescence body; this is then
first heated for a time to a moderate heat and then to a strong white heat.
This operation is also repeated until the ends of the body have become
plastic so that the first class conductor can be pressed into it.
After hardening,
D71

page_text: the conducting power of the point of connection with the first class conductor is
so good that when working with the electric current, it no longer becomes plastic.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, we declare that what
we claim is:-
Process for producing a conducting connection between conductors of the first.
class and those of the second class for electrical glow lamps consisting of con-
ductors of the second class, which consists in subjecting the ends of the said
incandescence body, when coated with a suitable substance such as metalloids,
metal or their oxygen freed compound to a white heat in an oxyhydrogen flame
or other source of heat, so as to convert the ends of the incandescence body into a
plastic condition, and then pressing a first class conductor into the same, so that
on cooling a rigid conducting connection is formed between the two, substantially
as described.
Dated this 13th day of September 1899.
ABEL & IMRAY,
Agents for the Applicants.