Incandescent Electric Lamps.
Year: 1885

page_text: Incandescent Electric Lamps.
We GEORGE DAVIDSON, ROBERT CATTLEY JACKSON and JOHN BLACK DUNCAN
all of Alexandra Electric Light Works, Gateshead on Tyne Electrical Engineers.
do hereby declare the nature of our said Invention for "IMPROVEMENTS IN THE
MANUFACTURE OF FILAMENTS OR CARBONS FOR INCANDESCENT ELECTRIC LAMPS
to be as follows:-
"
It is well known that in order to have a durable Electric lamp the sectional area
must be uniform throughout the entire length of the filament and our Invention
has for its object the attainment of such a uniform sectional area. The material
which is to be carbonized to form the filaments is according to our Invention cut
into uniforin strips by causing it to revolve against a cutting instrument or by
causing cutting instruments to rotate against it. This may be conveniently effected
by winding the material tightly on a mandril or cylinder which is then placed in
a lathe or other suitable machine and caused to revolve rapidly whilst a sharp
cutting tool or tools is or are caused to act against the surface of the material so as
to cut uniform strips of the material of any length and breadth that may be
required. Or the material may be cut by circular blades fixed upon a spindle
placed parallel to the mandril or cylinder round which the material is wound the
mandril and spindle being caused to revolve in opposite directions and to bear
against each other. Or the material may be spread on a table and the strips be
cut by blades fixed upon a revolving spindle caused to traverse the full length of
the material or the table carrying the material may be traversed' against the revolving
blades. These strips so cut are carbonized in any suitable way but we prefer the
manner described in the Specification of our application for Patent No 14,045 of
23rd October 1884.

page_text: Incandescent Electric Lamps.
We GEORGE DAVIDSON, ROBERT CATTLEY JACKSON and JOHN BLACK DUNCAN
all of Alexandra Electric Light Works Gateshead on Tyne Electrical Engineers.
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
following statement :-
It is well known that in order to have a durable Electric lamp the sectional
area of the filament or carbon must be uniform throughout its entire length and
our Invention has for its object the ready attainment of such a uniform sectional
area. The material which is to be carbonized to form the filaments or the
carbonized material is according to our Invention cut into uniform strips by
causing it to revolve or travel against a cutting instrument or by causing cutting
instruments to rotate or travel against it. This may be conveniently effected by
winding the material tightly on a mandril or cylinder which is then placed in a
lathe or other suitable machine and caused to revolve rapidly whilst a sharp
cutting tool or tools. is or are caused to act against the surface of the material so
as to cut uniform strips of the material of any length and breadth that may be
required Figure 1 of the accompanying drawing illustrates a suitable arrangement
of a lathe and tool the parts which are not necessary to the explanation of our
Invention being omitted. a is a cylinder upon which the material b is tightly
wound and c are the parts of the lathe between which it is placed and by which
it is rotated d is a cutting instrument by which the material is cut The action
in cutting may be effected by a traversing of the operating parts in the same
manner as in a screw cutting lathe. Or the material may be cut by circular
blades e fixed upon a spindle f placed parallel to the mandril or cylinder a as
shewn in Figure 2 the material being wound around the mandril or cylinder as
before described and the mandril and spindle being caused to revolve in opposite
directions may be effected by any suitable arrangement of gearing connected with
the axes of the parts which carry the cylinder and the tool respectively and the
bearing against each other of the cylinder and tool may be applied by hand or by
a weight or spring pressing the tool against the material or the material against
the tool or both. Or the material may be spread on a table and the strips be cut
by blades fixed upon a revolving spindle caused to traverse the full length of the-
material or the table carrying the material may be traversed against the revolving
blades after the manner of a planing machine or the material may be spread on a
table and the strips or filaments may be cut by blades fixed on a revolving spindle
as shewn in Figure 3 the material being wound on the cylinder marked A and
caused to travel over the table B, whilst the cylinder C, in rotating takes the strips
or filaments which have been cut in passing across the table B.-D is the spindle
carrying the cutter or cutters E. F being a weight causing the cutter or cutters
to bear on the travelling material. Or hand pressure or a spring may be used for
this purpose.

page_text: For cutting carbonized material a method similar to that shewn in Figure 3 is
suitable.
Having now particularly described and ascertained the nature of our said
Invention and in what manner, the same is to be performed we declare that what
we claim is
The manufacture of strips or pieces for filaments or carbons for incandescent
electric lamps by cutting the material to be carbonized or the carbonized material
uniformly by means of cutting instruments caused to rotate or travel against the
material or against which the material is caused to rotate or travel or by causing
both the material and the tools to rotate or travel against each other substantially
as hereinbefore described.