Improvements in or connected with Railway-carriage and other Roof-lamps.
Year: 1894

page_text: Date of Application, 29th Nov., 1894-Accepted, 12th Jan., 1895
COMPLETE SPECIFICATION.
Improvements in or connected with Railway-carriage and other
Roof-lamps.
We, WILLIAM MCLAREN of 70 Canfield Gardens, West Hampstead, Manu-
facturer and HARVEY EZRA BROWN of 18 Ballater Road, Brixton, Engineer, both
in the County of London, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to improvements in or connected with railway-carriage
and other roof lamps and has for its object to enable the lamp-body and reflector-
holder of such lamps to be made lighter, stronger and more durable than is possible
when these parts are made of cast-iron as at the present time.
We accomplish this object by stamping or drawing from wrought sheet steel or
other suitable metal both the lamp-body and the reflector-holder whereby we
produce the parts of equal thickness throughout as well as increase their strength
and at the same time greatly reduce their weight.
The stamping or drawing is effected by dies and ensures the maximum of
uniformity with respect to the shape and dimensions of the parts and likewise
enables the ventilating holes to be punched out with extreme uniformity. Moreover
superior joints can be produced at those parts where the smooth and true stampings
come into contact, thereby permitting of a more perfect ventilation of the lamp
than heretofore.
In the accompanying drawings we have shewn an advantageous manner of
constructing a railway carriage lamp in accordance with our invention,
Figure 1 being a sectional elevation and
Figure 2 a plan of the lamp-body and the parts carried thereby.
As will be seen from these figures the lamp-body is composed of two parts,
consisting of a cylindrical portion a and an annular plate a*. The cylindrical portion a
is produced by stamping a metal plate to the shape of a cup or dish, and then cutting
out the bottom thereof in such a manner that, after drawing said cup or dish
through the dies for producing the cylindrical form, a ledge a¹ will be left all
around the inside of the bottom of the cylindrical portion a over which the
inner edge a of the annular plate a* is beaded to firmly secure these parts
together.
b is the reflector which according to our invention constitutes both the
reflector proper and the reflector-holder. It is enamelled on its lower surface
thereby dispensing with the separate enamelled reflector which in lamps as at present
constructed is ordinarily screwed or otherwise connected to the reflector-holder.
Our reflector is formed with a flange b which rests upon the ledge a¹ of the
cylindrical portion a so that although fitting securely within the lamp body it can
be readily detached therefrom when desired. 63 is the chimney which is made as
a separate piece that is capable of being shrunk on to or screwed to the rim or
flange 6 of the reflector. By constructing our reflector as above described the
necessity for an enamelled reflector proper for attachment to a reflector-holder is
dispensed with and consequently, in the event of the enamelled portion of our
reflector becoming chipped or otherwise damaged, we can readily remove the
entire reflector from the lamp body and after disconnecting the chimney discard
the damaged portion.

page_text: We do not confine ourselves to the specific mode described and shewn for
connecting together the lamp-body and its flange, as any other suitable method
may be adopted; and where practicable these parts may be made in one piece.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what we
claim is :-
1. A railway carriage or other roof-lamp in which the body and the reflector
are constructed from sheet steel or other suitable metal by stamping or drawing the
parts to the requisite size and form substantially as described and for the purpose
specified.
2. A railway carriage or other roof-lamp in which the reflector and reflector-
holder are constructed in one piece from sheet steel or other suitable metal by
stamping or drawing substantially as described and for the purpose specified.
3. A railway carriage or other rcof-lamp constructed substantially as herein-
before described with reference to the accompanying drawings and for the purpose
specified.
001 1
T
1.
1004
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants.