Improvements in or relating to Incandescent Electric Lamps.
Year: 1895

page_text: Date of Application, 25th Nov., 1895
Complete Specification Left, 25th Aug., 1896-Accepted, 24th Oct., 1896
PROVISIONAL SPECIFICATION.
Improvements in or relating to Incandescent Electric Lamps.
I, EDWARD BURNET of Brynn, near Wigan in the County of Lancaster, do
hereby declare the nature of this invention to be as follows:-
This invention relates to incandescent electric lamps and embodies certain
novel features of improvements hereinafter set forth. The invention is designed
particularly for use as a pocket electric lamp for carrying about and for other
purposes.
In carrying the invention into effect, the plan 1 prefer is to provide a suitable
cylindrical holder and parabolic reflector combined, in which the incandescent
lamp bulb is contained. The reflector may be a white enamelled one, and the
glass lens in front of the bulb is spun into the cylindrical casing or holder
aforesaid. The bulb is looped at the sealing point and secured through the
reflector by a pin into a vulcanite back or soldered etcetera to reflector through the
loop, the projecting shoulder of the other end of the bulb being inserted in a hole
in the reflector so that the latter is clear of the platinum loops or terminals. The
whole lens and carrier are connected with a battery such, for example, as that
described in my Application of even date herewith No. 20925 of 1895 by a
flexible insulated wire and when all is in position the lamp is hooked onto a lug on
the case.
The battery-end of the flexible wire consists of a hook, with the mouth just wide
enough for the screw shank of the terminal to pass through. The stem of the
hook is flattened and then formed into a hollow tube for the insertion of the end of
the flexible wire, which is soldered therein. The upper portion of a nut on the
screw shank has a groove turned round the edge, so as to form a seating for the
hook, and the lower face of another nut which abuts against the first one, is
similarly treated. To use the connection, the nut with the groove in its lower face
is screwed up the shank a little and the hook is then put upon the seating formed
by the other nut. This being effected the nut with groove in its lower face is
screwed down upon the lot. The grooved seating prevents the hook from
"spreading," and secures a perfect contact. The hook cannot possibly become
detached unless the top nut is unscrewed sufficiently to allow the hook to rise quite
free of its seating. At the same time the flexible wire can be detached from the
terminal without the necessity of taking the top nut entirely from the screw shank.
With regard to the contact maker for lens etcetera.-The lens-ends of the flexible
wire are carried respectively to small screws, fixed in the vulcanite back, one being
connected with one loop of the lamp bulb, while the other passes through a metal
plate into the vulcanite back. Through the same plate is screwed the thumbscrew.
The lower end of this thumb screw penetrates a cavity in the vulcanite back,
containing a spring, which is suitably connected with the other loop of the lamp
bulb. When it is required to form the connection, the thumb-screw is screwed
down so as to touch the spring in the cavity. The back can of course be made of
any suitable non-conducting material.
Dated this 21st day of November 1895.

page_text: Improvements in or relating to Incandescent Electric Lamps.
I, EDWARD BURNET of Brynn near Wigan in the County of Lancaster 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:―
This invention is designed more especially for use in portable electric light
apparatus. It is best described by aid of the accompanying drawings, in which,
Figure 1 is a section, and
Figure 2 a plan of a lamp;
Figure 3, section of the back plate and accompanying parts;
Figure 4, two views of the suspension hook;
Figures 5 and 6 enlarged view of the battery terminal;
Figure 7 side hook for fixing flexible wire to the battery terminal;
Figure 8 oblique view of part of a looped rubber tube for attaching the lamp to
a bicycle lamp bracket.
In these, A is a base plate or back plate formed of vulcanite or other suitable
material, preferably a non-conductor. If however it be not a non-conductor the
contact screw and contact spring should be carefully insulated from it.
B para-
bolic reflector, preferably made of tin, copper or other malleable sheet metal
enamelled white. Cincandescent lamp bulb. D cylindrical holder formed of
similar metal to the reflector and attached by screws or other convenient manner
to the base plate A and having the lens E spun into it. F the sealing point of the
lamp bulb.
This is surrounded as shown by a fine wire spring which is secured in
any suitable manner to the reflector. Other modes of attaching this part of the
lamp to the reflector can be used, but I find it very desirable in a lamp subject to
vibration, such as a bicycle lamp, that both ends of the lamp should be thoroughly
secured to the reflector. The other end of the bulb passes through a hole made to
fit in the reflector and in such manner that the platinum loops are clear. One of
these loops is connected with a hook T of contact spring S. The other loop is
connected with one end of one of the two battery-wires. The battery-ends of
these wires are soldered into the hollow shanks of hooks M, (Figures 6 and 7).
The battery terminals have grooves as shown in their contiguous faces (KL) in
which fit the bodies of the hooks, the shanks of the hooks being of less diameter
than the parts which sit in the grooves. When, therefore, the terminal nuts are
tightened, the hooks are held imprisoned, but a very little unscrewing of the
upper nuts enables the hooks to be withdrawn. The double flexible wire is shown
in Figure 1, at N. The contact screw G makes contact with spring S by being
screwed up till it touches it. The grooved seating of the two nuts prevents each
terminal hook from spreading, and secures a perfect contact. The hook cannot
become detached unless the top nut is unscrewed sufficiently to allow the hook to
get clear of the seating.
The contact screw G makes contact with spring S, by being screwed up till it
touches it, one end of the battery wire which is not coupled up directly with the
bulb being suitably connected with the socket of the contact screw G.
In
At the same time the flexible wire can be detached from the terminal without
the necessity of taking the top nut entirely from the shank, a very slight screwing
back being sufficient. II shown in detail in Figure 4, and in place in Figures 2
and 1, is the hook for suspending the lamp to its support or to the battery.
Figure 8 a short rubber tube is shown suitable for being placed on the bicycle
lamp bracket which passes through the larger hole. Hook I is then passed into
the smaller hole and thus the lamp at once attached to the bicycle bracket.

page_text: 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. The improvements in or relating to incandescent lamps, which consists in an
incandescent lamp bulb secured in a reflector at both its ends and the reflector held
in a cylindrical or conical metal holder into which the lens is spun and to which a
suitable backing with contacts is attached.
2. The combined hook and nut device for terminal, substantially as described.
3. The general construction of portable lamp applicable for being attached to a
portable battery or a bicycle, substantially as herein described and illustrated.
Dated this 24th day of August 1896.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham, and London, Patent Agents.