Improved Method of Repairing Incandescent Electric Lamps.
Year: 1892

page_text: Date of Application, 29th Feb., 1892
Complete Specification Left, 29th Nov., 1892-Accepted, 31st Dec., 1892
PROVISIONAL SPECIFICATION.
Improved Method of Repairing Incandescent Electric Lamps.
We, WILLIAM STEPNEY RAWSON of 88 Queen Victoria Street, London E.C.
Electrician and WOODHOUSE AND RAWSON UNITED LIMITED of 88 Queen
Victoria Street, London E.C. Electrical Engineers and Contractors, do hereby
declare the nature of this invention to be as follows :-
Our invention relates to an improved method of repairing incandescent electric
lamps.
Hitherto the processes have consisted of opening the point or "pip" of the
lamp, cleaning the glass and attaching a new filament to the leading in wires, and
finally exhausting in the usual way.
These methods present certain difficulties both in manipulation and in the
treatment before final exhaustion.
We adopt the following methods to avoid both these disadvantages.
We cut off the neck of the lamp at a suitable point between the shoulder and
the loops or cap. This may be done either before or after air is admitted into the
globe at any other suitable point such as the "pip," and we may use any suitable
method, such as that with an incandescent wire for effecting a clean circular
separation at the neck, so as to facilitate the subsequent operations. When the
separation has been effected, the leading in wires and broken filament are
withdrawn with the upper part of the neck, and a new filament can then be easily
attached to the wires by any of the well known methods.. Subsequently the
original, or if advisable a new, globe is joined to the neck by an ordinary fusion of
the glass, care being taken to make the joint perfectly sound. The lamp is then
ready to be exhausted in the ordinary way.
By the above methods the attachment of the new filament and the subsequent
treatment of the same if necessary, are rendered very simple, and the majority of
parts are used again to make a new lamp.
Dated this 90th day of February 1892
COMPLETE SPECIFICATION.
Improved Method of Repairing Incandescent Electric Lamps.
We, WILLIAM STEPNEY RAWSON of 88 Queen Victoria Street, London, E.C.
Electrician and WOODHOUSE AND RAWSON UNITED LIMITED of 88 Queen
Victoria Street, London E.C. Electrical Engineers and Contractors, 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 invention relates to an improved method of repairing incandescent lamps.
Hitherto the processes have consisted of opening the point or pip of the lamp,
cleaning the glass and attaching a new filament to the leading in wires, and finally
exhausting in the usual way.
These methods present certain difficulties both in manipulation and in the
treatment before final exhaustion. We adopt the following methods to avoid both
го

page_text: of these disadvantages, which by reference to the accompanying drawings will be
easily understood.
Fig. 1 represents a lamp with a broken filament.
Fig. 2 represents the neck and leading in wires, with filament and globe
removed.
Fig. 3 represents the globe as it appears when detached.
Fig. 4 represents Fig. 2 with a fresh filament in position and ready for insertion
and sealing into the globe.
We take a lamp as represented in Fig. 1 having a broken filament C, and admit
air into the globe D at the pip A say, then we make a clean separation of the
globe D from the neck E somewhere about the line B Fig. 1 with a diamond point
or a heated wire or by any of the known methods, after which we withdraw the
filament C and leading in wires F F from the globe, and prepare the leading in
wires FF Fig. 2 for the reception of a new filament. In Fig. 4 is shown a new
and intact filament G, mounted and ready for insertion into the old globe after
cleaning it, or if necessary a new one may be used Fig. 3, which is joined to the
neck by an ordinary fusion of the glass, or by a suitable cement, care being taken
to make a good joint.
The lamp is then ready to be exhausted in the usual way.
By the above methods the attachment of a new filament and the subsequent
treatment of the same if necessary, are rendered very simple, and the majority of
parts are used again to make a new lamp.
The above methods are obviously applicable to either capped or uncapped
lamps.
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
I. The method of repairing incandescent lamps by admitting air to the lamp
making a separation of the globe at or about the neck, attaching a new filament
to the leading in wires and fusing or cementing the separated neck to the
original globe or to a new one, substantially as described and for the
purposes
set forth.
II. An incandescent lamp in which the neck portion with the leading in wires
with or without an attached cap has been separated from the rest of its accom-
panying globe and again attached to it or to a new one, substantially as described
and for the purposes set forth.
Dated this 29th day of November 1802