Improved Process or Method of Renewing Flexible Carbon Filaments in Glow or Incandescent Electric Lamps.
Year: 1890

page_text: Date of Application, 25th Sept., 1890
Complete Specification Left, 23rd June, 1891-Accepted, 8th Aug., 1891
PROVISIONAL SPECIFICATION.
Improved Process or Method of Renewing Flexible Carbon Filaments
in Glow or Incandescent Electric Lamps.
We, CASIMIR PAUTHONIER, Electrician of 143 Rue St. Antoine, Paris,
France, and L'INCANDESCENCE ELECTRIQUE SOCIÉTÉ of same place, do hereby
declare the nature of this invention to be as follows:-
The object of this invention is a process or method of repairing incandescent
electric lamps.
In effecting this purpose, we adopt the following plan for preventing breakage of
the glass through the sudden introduction of air. A line is traced by means of a
diamond or a file on the globe, preferably at that part where the button or knob is
situated, and by applying a piece of hot glass or an iron heated to redness to the
mark, the glass will crack at the mark for the air to enter slowly. The piece is
then removed, the opening being of sufficient size to allow of the easy insertion of
a new filament by pliers which holds and maintains the ends of the filament at a
distance apart about equal to that between the platinum electrodes.
In order to effect the practical union of the new filament to the old, the broken
carbon is cut at about 2 millimetres from the platinum attachments, so as to leave
a small piece of the old carbon to facilitate the soldering and attachment of one to
the other.
The soldering can be effected in any known manner and the globe made perfect
again by re-uniting and the usual vacuo operation.
In this manner all old lamp globes and their platinum contacts may be utilized,
the filaments only being renewed.
Dated this 25th day of Sentember 1890
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Casimir Pauthonier and L'Incandescence
Electrique Société.
COMPLETE SPECIFICATION.
Improved Process or Method of Renewing Flexible Carbon Filaments
in Glow or Incandescent Electric Lamps.
We, CASIMIR PAUTHONIER, Electrician, of 143 Rue St. Antoine, Paris,
France, and L'INCANDESCENCE ELECTRIQUE SOCIÉTÉ, of same place, 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:
Our present invention is an improvement on a former invention, for which one of
us has obtained Letters Patent, No. 15888 of 1886, and it consists in an improved
process or method of repairing incandescent electric lamps.
In effecting this purpose, we adopt the following plan for preventing breakage of
the glass through the sudden introduction of air. A line is traced by means of a
diamond, or a file on the globe, preferably at that part where the button or knob is
situated, and by applying a piece of hot glass, or an iron heated to redness to the
mark, the glass will crack at the mark for the air to enter slowly. The piece is
then removed, leaving an opening of a size to enable the following operations to be
carried out. If it is desired to insert a new filament, the new filament is held by
pliers, so that the ends of the filament are at a distance apart from each other
Price Adl

page_text: about equal to that between the platinum electrodes. The pliers and filament are
then passed through the hole in the glass, and the new filament is so held that its
two ends come into contact with the broken carbon of the old filament which must
have been cut at about 2 millimetres from the platinum attachments, so as to leave
two small pieces of carbon projecting from the platinum electrodes.
The soldering can be effected in any known manner but the most convenient
method is to pass a current of electricity through the lamp, which in passing from
one platinum electrode to the other through the pliers deposits carbon around the
points of contact of the new filament with the broken ends of the old one. This
having been effected, the globe may be made perfect again by sealing and exhausting,
which operations are well understood.
If it be desired merely to repair a break in the leg of a filament we adopt the
method of preparing the glass globe or bulb before described and having fixed the
lamp in the usual way to any suitable source of electric energy and also connected
the pliers externally to the platinum loop of the lamp which corresponds to the
long unbroken leg of the filament, we charge the bulb with a liquid hydro-carbon,
say pure benzine and then by means of the pliers grasp the long leg of the filament
just above the fracture and apply its end to the stump, thus completing the circuit,
but short circuiting the long leg of the filament by the external wire and the pliers..
The result is that an arc is formed.
When the fracture has taken place near the middle of the filament so that the
stump is relatively long it is sometimes advisable to use two pairs of pliers respec-
tively connected to the two poles of any suitable source of electricity. Each leg
of the broken filament is then grasped with one pair of pliers close to the fracture
and on the two ends being made to touch the arc forms and the soldering is
effected.
In this manner all old lamp globes and their platinum contacts may be utilized,
. the filament only being renewed or repaired.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. The method described of introducing a new filament into a lamp and attaching
it to the platinum electrodes.
2. The method described of repairing a fractured filament, whereby the soldering
current is short circuited through the pliers.
The 23rd day of June 1891.
H. GARDNER,
Per R. Core Gardner,
Patent Agent, 166, Fleet Street, London,
Agent for the said C. Pauthonier and L'Incandescence Electrique Société.