Improvements in Portable Electrical Railway Carriage and other Roof Lamps.
Year: 1895

page_text: Date of Application, 17th July, 1895
Complete Specification Left, 17th Apr., 1896-Accepted, 23rd May, 1896
PROVISIONAL SPECIFICATION.
Improvements in Portable Electrical Railway Carriage and other
Roof Lamps.
I, HENRY WILLIAM HEADLAND of The Electric Light Works High Street
Leyton in the County of Essex Electrical Engineer do hereby declare the nature
of this invention to be as follows:
--
According to this invention as more particularly applicable for a railway
carriage roof lamp I place an accumulator battery by preference the one described
in the Specification of my Letters Patent No. 15120 dated 22nd August 1892 in
a round casing suitable for the hole in the roof. This casing is mounted upon a
base of wood or other suitable insulating material to which a glow lamp is
attached the light of which is reflected downward by a concave mirror arranged
below the base and above the lamp. The enclosing globe is attached to a metallic
rim which rests on a flange of a ring which together with the flange on the mirror
are fastened to the base by screws or bayonet joint. A rubber ring or cushion is
provided to carry the weight of the lamp and "battery against the usual flange in
the opening in the roof. The electrical connections are in the base, and a switch
is provided which can be actuated either from the top or from below.
TI
1002
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.
COMPLETE SPECIFICATION.
Improvements in Portable Electrical Railway Carriage and other
Roof Lamps.
I, HENRY WILLIAM HEADLAND, of The Electric Light Works, High Street,
Leyton, in the County of Essex Electrical Engineer, 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:-
According to this invention AS more particularly applicable for a railway
carriage lamp I place an accumulator battery by preference of the character
described in the Specification of my Letters Patent No. 15120 dated 22nd August
1892 in a round casing suitable for the hole in the roof. This casing is detachably
mounted upon a base of wood or other suitable insulating material to which a
glow lamp is attached the light of which is reflected downwards by a concave
mirror arranged below the base and above the lamp. The bottom of the casing
and the top of the base have contacts which form electrical contact when the
casing is mounted on the base and connected thereto by bayouet joint or other
instantaneous locking device and a switch turned on which is provided for making
and breaking the circuit between battery and lamp. This switch is adapted to be
actuated either from the top alone outside the carriage or from the top and also
from below, inside the carriage. The base with the lamp and enclosing glass
shade or globe for the lamp are carried by a metallic ring with flange which rests
with an intervening rubber washer or the like in the usual annular recess formed
LD017

page_text: in the top of the carriage roof said washer carrying the weight of the lamp. The
base and the ring are detachably connected by screws or by bayonet joint.
The accompanying drawing is a vertical section through such a lamp applied to
the roof of a railway carriage.
The round casing A serves to receive the accumulator battery and is provided
with a detachable lid A'. This casing is detachably mounted on a base B to which
a glow lamp C is fixed the light of which is reflected downward by a concave
metal mirror or reflector D the up standing flange of which by means of bayonet
joint D¹ serves to attach the casing A thereto. E is a rubber washer or the like
-for-insuring an even and firm bearing so that the joint does not shake loose. The
bottom of the casing A and the top of the base B have contacts N S and N' S¹
respectively, which form electrical contact when the casing is mounted on the base
and connected thereto by the bayonet joint D¹, and when the switch E for making
and breaking the circuit between the battery and the lamp is turned in between
the spring S and the contact S. This switch is adapted to be worked from below
by means of a key inserted in a square recess or the like in a socket on the
bottom of a rod or handle G formed with upper square head and square recess
therein, or to be worked from above by the rod or handle H, the square bottom
end of which can be depressed into the square recess in the square head of the
handle G or the switch may be adapted to be worked from above only; I is a
spring for normally keeping the rod H in the raised position. The base B with
the lamp C and the globe or shade K are carried by the metallic ring L the upper
flange of which rests in the usual annular recess formed in the top of the carriage
roof M. The intervening flanged rubber washer O carries the weight of the
entire lamp and battery and counteracts the effect of vibration and shocks both
up and down and sideways. The base B and the ring L are detachably connected
by one or more screws L'. When the casing with battery is detached from the
base for recharging the battery the lid A' is put on the base which it is made to
fit say for instance by a rim A³. Or the entire lamp including base and globe
may be taken out and as easily put in in any other carriage roof hole. It will be
noticed that no wires or other parts have to be disconnected when a lamp has to
be removed and that each lamp is independent self contained and carrying its own
supply of power, thus ensuring constant and uninterrupted light whenever
required.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. A carriage roof lamp consisting of an accumulator battery in a casing which
is detachably connected to a base of wood or other insulating material contacts
being provided on each, said base carrying on its underside a glow lamp supplied
from the battery above it and a reflector, which are detachably connected to a
metal ring that also carries the globe for the lamp and rests in an annular recess
in the carriage roof with an intervening rubber washer or cushion, a switch being
provided for turning the current on or off from the top of the battery casing and
if desired also from the bottom substantially as set forth.
2. The construction of lamp described and shown..
Dated this 17th day of Anvil 1806
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.