Improvements in or relating to Lamp Chimneys.
Year: 1895

page_text: Date of Application, 21st Sept., 1895
Complete Specification Left, 1st June, 1896-Accepted, 4th July, 1896
PROVISIONAL SPECIFICATION.
Improvements in or relating to Lamp Chimneys.
I, JOSEF INWALD, of Wenzelsplatz, Prague, in the Empire of Austria,
Manufacturer, do hereby declare the nature of this invention to be as follows:-
My invention relates to improvements in lamp-chimneys.
In the use of gas-incandescence lamps the defect has made itself felt that,
whenever the chimney bursts the incandescent mantle is damaged by the glass
splinters or fragments and must be replaced by a new one, whereby the advantage
of the incandescence burners is materially diminished in part by the increased cost
of mantles.
For the purpose of providing against this defect, I arrange close against the
glass cylinder on the inner side thereof, a tubular protective metallic wire net,
which is either secured to the gallery of the burner, or is simply slipped inside the
chimney.
It is evident, that, in case of the lamp-cylinder bursting, the fractured
glass-fragments must fall clear of the mantle and cannot therefore damage it, as
the wire-netting acts as a protector surrounding the same, while the illuminating
power of the incandescent mantle is very little if at all affected thereby.
Dated this 21st day of September 1895.
BOULT & WADE,
Agents for the Applicant.
Improvements in or relating to amp
I, JOSEF INWALD of Wenzelsplatz, Prague in the Empire of Austria,
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:-
My invention relates to improvements in lamp-chimneys.
In the use of gas-incandescence lamps the defect has made itself felt that,
whenever the chimney bursts the incandescent mantle is damaged by the glass
splinters or fragments and must be replaced by a new one, whereby the advantage
of the incandescence burners is materially diminished, in part by the increased cost
of mantles.
For the purpose of providing against this defect I construct devices such as are
exemplified in the accompanying drawings, wherein
Figs. 1 and 2 are side elevations of incandescence gas-burners with improve-
ments according to this invention applied thereto,
Fig. 3 being a section on the line xx of Figs. 1 and 2;
Fig. 4 shows the separate wire net hereinafter described.
With reference first to Figs. 1 and 3 I arrange close against the glass cylinder
on the inner side thereof, a tubular protective metallic wire net N which is
simply slipped inside the chimney.

page_text: It is evident, that in case of the lamp-cylinder bursting, the fractured glass-
fragments must fall clear of the mantle K¹ and cannot therefore damage it, as the
wire-netting acts as a protector surrounding the same, while the illuminating power
of the incandescent mantle is very little if at all affected thereby.
But even this arrangement does not quite answer, as, when the glass chimney is
to be cleaned, the metallic net must be also removed with the chimney, as it is not
secured to the burner and during such removal the mantles get easily damaged.
Therefore I make the following arrangement illustrated by Figs. 2, 3 and 4.
The wire net has a cylindrically bent sheet metal strip A soldered or otherwise
secured to it, the overlapping ends of this strip being slightly springy, in order
to make them fit exactly galleries K of different burners.
The metal strip A has besides projecting pieces 11 (Fig. 4) which project
downwards when the wire net N is introduced into the gallery K of the burner.
Then these projections are bent round the lower edge of the gallery, as shown in
Fig. 2, and so hold fast the wire net N. It is clear that in this manner the
wire net forms a secure guide for the chimney, so that the mantles cannot be
damaged either during the operation of putting the chimneys in place or their
removal, as the fixed wire net forms a protecting guard round the incandescent
mantle.
Instead of projecting pieces 1 lugs or other connections which can be easily
disconnected can be used for securing the wire net to the gallery, or the
projections can be made simply continuations of the wires.
It is a fact that by this invention the cylinders are made much more durable as
the heat is more uniformly distributed and thereby the bursting of chimneys,
usually caused by unequal heating is nearly completely avoided.
Glass chimneys of the worst quality which generally burst at once on an
incandescent mantle last very well when wire net is used; the chimney can be
cleaned without the incandescent mantle suffering the slightest damage, so that
even quite inexperienced persons can be entrusted with the cleaning.
As the net is made of the thinnest wire, it does not injuriously influence the
illuminating power of the burner, and its practical value becomes evident even
after the shortest use.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed 'I declare that what I
claim is:―
1. Inside the glass chimney of incandescent lamps the arrangement of a tubular
metallic-wire net (N) for the purpose of protecting the incandescent body (K')
from injury by glass splinters in case of the breakage of the chimney.
2. The arrangement on the protecting wire nets for incandescent mantles of pro-
jections or lugs or other easily-disconnected connecting devices at the lower end
of the wire net for connecting these projections with the gallery K of the burner
and thus producing an easily-disconnected connection between the wire net and the
gallery of the burner.
3. In the wire net according to Claim 2, the arrangement if desired of a springy
metal strip A at the lower end of the net N on which strip are provided the
projections for securing the net.
Dated this 30th day of May 1896.
BOULT & WADE,
Agents for the Applicant..