Improvements in or connected with Bunsen Burners for Incandescent Lighting..
Year: 1898

page_text: COMPLETE SPECIFICATION.
Improvements in or connected with Bunsen Burners for
Incandescent Lighting..
I, GOTTLOB HIMMEL, of 5, Pfleghofstrasse, Lübingen, Wurtemberg, in the Empire
of Germany, Manufacturer, 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 :-
One of the greatest drawbacks of the well known incandescent gas lamps is the
great brittleness of the incandescent mantles of such lamps, more particularly when
the latter do not always remain in the same position but as is mostly the case have
another position during the period of illumination than during the period when the
lamps are not in action. The placing of a lamp somewhat brusquely on the table, a
sharp pull on a hanging lamp, or a small sudden side movement of a movable wall
lamp is usually sufficient to destroy the expensive incandescent mantle. This is still
more frequently the case with incandescent gas lamps which are employed in the
open air, for instance for lighting streets, bridges and the like. In such case a
vigorous puff of wind or the rapid passage of a heavy vehicle or the like may be the
cause of destroying the incandescent mantle of the lamp which is set in vibration
thereby. The cause of the destruction is that the incandescent mantle or its
suspension pins are rigidly connected with the lamp.
All experiments made in various directions hitherto to construct an elastic
suspension for incandescent mantles and thereby to diminish the liability to breakage
of the latter have given no satisfactory result.
My invention relates to a means of suspending the upper part of the lamp, by
which the burner, incandescent mantle and the glass cylinder are carried by a
means of suspension having an elastic action in all directions so that any shock,
immaterially of the direction it comes from, is paralysed or counteracted before it
reaches the upper part of the lamp.
This I attain in the simplest manner by providing the burner tube or air tube
of the Bunsen burner of the lamp with such slots or nicks that the burner tube which
is screwed below on to the gas inlet nozzle sits firmly thereon whilst the upper part
carrying the crown, incandescent mantle and cylinder has a spring action in all
directions owing to the slots.
Any shaking of the lamp from any side is therefore conveyed only to the very
smallest degree to the upper part of the lamp wherein the mantle is contained, in
consequence of the spring action of the upper part of the burner tube, that is to say
the shock is compensated for.
In the accompanying drawings three forms of construction showing various kinds
of slots in the burner tube A are shown in Figures 1-9.
The most suitable slot having for its object to give a spring action to all sides to
the upper part a¹ of the burner tube A is a spiral slot C running round the lower
part of the tube A, the pitch of which may be made larger or smaller according to
the weight of the lamp. The interval between the slots is accordingly a larger or
smaller one and in accordance therewith the spring action is smaller or larger. The
spring action is similar to that of a spiral spring and counteracts all joltings of the
lamp so that they have no action on the mantle D.

page_text: The spiral slot C also replaces the ordinary air supply holes a² Figure 5 in the
most advantageous manner, as this spiral slot produces a rotary action of the air
which produces a more thorough and rapid mixture of the air with the gas in the
part a of the burner tube.
.
The spiral slot C may however as shown in Figures 5 and 6 he formed in the upper
part a' of the burner tube and in this case the upper part of the lamp must be
mounted on the burner tube A. This arrangement is however less preferable because
the sleeve of the burner head which is suitably passed over the upper part of the
Bunsen burner tube A prevents or greatly affects the lateral play when shocks are
received by the lamp, and further there is the danger of the mixture of gas escaping
through the slot C¹ unburnt or being ignited therein without action.
A further kind of slot may be made in the burner tube A by cutting therein,
alternately from right and left, oblique or straight slots C¹ one above the other (see
Figures 7 and 8).
-
The burner tube A may of course be provided in any other suitable manner with
slots, nicks or the like without bringing the same outside the scope of the invention
so long as these slots only produce an elastic flexibility of the Bunsen burner tube
in all directions.
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 :-
A device in incandescent gas light lamps having for its object to prevent the
destruction of the incandescent mantle when the lamp it shaken, characterised by
slots of suitable form, but preferably spiral, being formed in the Bunsen burner air
tube A or the upper part of the air tube A carrying the incandescent mantle,
cylinder and the like to produce a spring action in all directions in such a way that
any shock encountering the lamp is paralysed or obviated by the spring action of the
air tube, substantially as herein before described.
· Dated this 31st day of January 1898.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.