Improvements in or relating to Lighting Devices for Lamps.
Year: 1897

page_text: Date of Application, 15th May, 1897-Accepted, 19th June, 1897
COMPLETE SPECIFICATION.
Improvements in or relating to Lighting Devices for Lamps.
I, GUSTAV DREYSPRING of Hinter der Kirche 1, Jena, Germany, Merchant, 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:-
The lighting devices used hitherto for street lamps especially those provided with
incandescent mantle burners consisted either of a permanently burning pilot or bye-
pass flame and a two-way cock, so that it was only necessary to turn the tap to light
the main flame or other auxiliary flames have been employed. Such lamps have also
been lighted from underneath by means of well-known lighting devices, in the same
way as ordinary lamps.
All the above devices have been found to be impractical and unreliable.
The disadvantages of these devices are completely avoided in the device according
to the present invention.
The device according to the present invention is shown in Fig. 1 of the accom-
panying drawing, applied to an incandescent gas street lamp, in vertical section in its
lighting position and consists of a lighting tube 4 arranged on an ordinary lighting
device 3 and having a perforated preferably pear-shaped end, which is passed through
a flap-cover 2 on the top 1 of the lamp-casing. The lighting of the gas is thus effected
from the top, after the gas-cock has been previously turned on by introducing the
perforated end of the lighting tube 4, into the interior of the lamp through the
opening 5 of the lamp top 1, covered by the flap-cover 2.
A groove or guide 6 leading to the opening 5, when the tube 4 of the lighting
device 3 is pushed into said opening enables the flap-cover 2 to be easily raised, said
cover being provided with a conical raised part 7, through which the perforated end
of the lighting tube 4 can easily enter raising the cover 2. When the lighting device 3
is withdrawn, the cover 2 closes owing to its weight.
Owing to the passage 5 in the top 1 of the lamp being downwardly inclined, the
lamp can never be blown out, but on the contrary this opening in combination with
the flap valve 2 acts as a ventilator and assists in producing an efficient circulation
of air.
Figs. 2 and 3 are details of different positions of the lighting tube 4 as it is
introduced into the lamp.
Fig. 4 is a cross section on the line a-b Fig. 3.
Fig. 5 is a detail plan of the flap-valve 2 with the guiding groove 6.
The new lighting device affords the following advantages
(1) Cheap installation, alterations to existing lamps being very slight.
(2) The incandescent bodies are less injured as the lighting takes place without
explosion.
(3) Saving the expense of a permanently burning bye-pass flame.
(4) Avoidance of shadow projecting parts on the underside of the lamp.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1
1. 11tion

page_text: pass beneath a flap-cover 2 on the lamp top an inclined guide 6 adjoining said flap-
cover 2 along which the end of the lighting tube 4 is passed and thence under a
raised portion of the flap 2, raising the latter and thus entering the interior of the
lamp, where it effects the ignition of the gas, the flap cover 2 closing in consequence
of its weight when the lighting tube 4 is withdrawn substantially as described.
D: 15th day of Ma- 1807
BOULT & WADE,
Agents for the Applicant.