Improvements in Portable Electric Safety Lamps.
Year: 1891

page_text: Date of Application, 25th Mar., 1891
Complete Specification Left, 28th Dec., 1891-Accepted, 30th Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in Portable Electric Safety Lamps.
I LARS BRISTÖL of Acacia Villa, Park End, Bromley in the County of
Kent, Electrician do hereby declare the nature of this invention to be as
follows:-
:-
My invention has reference to certain improvements in that type of portable
electric safety lamps which is the subject of my Letters Patent No. 8456 of
A.D. 1889, and has for its object to strengthen and simplify the construction, to
facilitate access to the gas escape plugs while effectually protecting same from
injury, and to effect greater convenience in directing the light when required for
certain purposes.
or
According to my present improvements I use for the outer casing steel, brass, or
other suitable metal and I form a flange round the top of same to which I fix by.
screws the top cover which when the lamp is on the side of the casing is also of
steel, brass or other metal. Upon the cover is fixed the bandle, swivelling
rigid, and in the cover I form an opening with a vertical rim through which
opening the vent hole tubes from the battery lid are brought up and fitted with
gas plugs, the whole being enclosed and protected by a swivelling cover plate.
In some cases I fix the lamp on the top of the cover which in that case is of
ebonite or other suitable insulating material similarly secured to the casing, and
the shape of the casing is arranged to admit of the gas tubes, plugs, opening, and
swivelling plate being disposed alongside the lamp.
The circuit arrangements remain substantially the same as set forth in my prior
Letters Patent above recited and any suitable type of secondary battery may
be used.
Internally I have a space between each side of the battery and the outer casing
which I fill with moderately compressed asbestos, cotton wool or other suitable
yielding material or I may use wooden distance pieces to strengthen the structure
and mitigate shocks caused by falls or accident.
Between the battery and the metal casing on the front side I interpose a wood
plate with grooves on its inner side through which the wires from the battery are
led and pass through holes in the casing to the circuit arrangements. The metal
casing itself acts as the negative pole during charging a hole being provided in any
convenient position for the charging connection, and the positive pole with a like
provision is brought out behind the external switch and so arranged that it is
insulated from the metal casing and is only accessible when the lamp is not
burning. The space between the top of the battery and the cover is filled with
any suitable composition for sealing the whole perfectly.
Dated this 25th day of March 1891.
J. C. CHAPMAN,
Agent.

page_text: COMPLETE SPECIFICATION.
Improvements in Portable Electric Safety Lamps.
I LARS BRISTOL of Acacia Villa, Park End, Bromley Kent, Electrician,
do hereby declare the nature of this invention and the manner in which the same
is to be performed to be particularly described and ascertained in and by the
following statement :--
My invention has reference to certain improvements in that type of portable
electric safety lamps which is the subject of my Letters Patent No. 8456 of
A.D. 1889, and has for its object to strengthen and simplify the construction, to
facilitate access to the gas escape plugs while effectually protecting same from
injury, and to effect greater convenience in directing the light when required for
certain purposes.
I will now fully describe my invention in reference to the accompanying
drawings which form part of this Specification and in which
Figure 1 is a vertical section and Figure 2 a plan of a portable electric safety
lamp showing my improvements, the lamp being on one side of the casing.
Figure 3 is a plan illustrating the disposition of the lamp upon the top alongside
of the cover plate.
Similar letters refer to similar parts in all of the figures.
According to my present improvements I use for the outer casing A which
contains the battery B, steel, brass, or other suitable metal and I form a flange a
around the top of same to which I fix by screws, bolts, or the like aº aº; the top
cover A which.when the lamp L is on the side of the casing A as illustrated
Figures 1 and 2, is also of steel, brass, or other metal. Upon the cover A¹ is fixed
rigidly or swivelling the handle H as shown hard, or it may be in the position on
the back if desired as shown dotted in Figure 1.
In the cover A' 1 form an opening O with a vertical rim or wall o forming a
chamber, through which chamber the vent hole tubes 6° from the battery are
brought up and fitted with gas plugs b, the whole being covered and protected by
a cover plate o' which may either be pivotted at one end and slotted at the other
as illustrated in Figure 2 so as to be adapted to swivel, or it may be sprung on by
resilient ends and catches or otherwise equivalently arranged for easy removal and
replacing.
In some cases I fix the lamp L upon the cover A' as illustrated in Figure 3 in
which case said cover A' is preferably of ebonite or other suitable insulating or
insulated material, similarly secured to the casing A, and the shape of the casing
is arranged to admit of the gas tubes and plugs bº, b, chamber o, and its cover
plate o' being disposed alongside the lamp substantially as illustrated.
The circuit arrangements remain substantially the same as set forth in my prior
Patent above recited, and any suitable type of secondary battery may be used.
Internally I may leave a space between each side or three sides of the battery
case and the outer casing A. which I may fill with moderately compressed asbestos,
cotton wool, or other suitable yielding material; or I may use wooden distance
pieces or plates to strengthen the structure and mitigate shocks caused by falls or
accidents. I have not illustrated this as it will be readily understood and forms no
part of my present invention.
Between the battery casing and the outer casing A at the front side I interpose
a wood plate W with grooves w on its inner side through which the wires p from
either pole, say P, of the battery B are led and pass through insulated holes.pl
in the casing to the circuit arrangements. The wires from the other pole of the
battery are led to the casing A which itself forms the other, say the negative pole:
For charging, one of the charging connections (say the -) is connected to a hole
in any convenient part of the casing, as for example at n' Figure 1; and the other

page_text: charging connection (say the +) is brought out behind the external lamp switch S;
it consists of a terminal or plug s screwed into the wood plate W insulated at s¹
from the metal casing A and the switch S as illustrated Figure 1, and the hole pl
is bored so that the two parts are only lineable and the charging connection or pin
can only be inserted when the switch S is "off," and the lamp not incandescent,
when it is readily accessible as illustrated.
The space C intervening between the top of the batteries B and the permanently
fixed lid or cover A', is filled with suitable acid proof and non-conducting cement
or composition for sealing and making the whole perfectly solid and strong.
Having now particularly described and ascertained the nature of this inven-
tion and the manner in which the same is to be performed I declare that what I
claim is :-
1. In a portable electric safety lamp the combination of a metal casing for the
batteries with flanged top, a cover adapted to be secured to said flange and
provided with an enclosed chamber with moveable cover for receiving, protecting,
and providing access to the gas escape openings from the batteries, substantially
as described and illustrated.
2. In a portable electric safety lamp, the combination of metal case A, cover A¹
provided with enclosed gas escape chamber O, space C and its filling between said
cover and batteries, and face plate W, the lamp being disposed either as shown
in Figures 1 and 2 or in Figure 3, all substantially as and for the purposes set
forth.
3. In a portable electric safety lamp the combination with a flanged metal casing
constituting one pole and having one charging connection hole, of a grooved
wooden internal face or front plate for the wires of the other pole and the charging
connection therefor behind and in the external switch, and constructed and arranged
to be used in the manner and the purposes specified.
4. In a portable electric safety lamp such as is hereinabove described having a
permanently fixed cover or lid, the provision of a space intervening between the
batteries and the lid, and filled solidly with acid proof and non-conducting cement
or equivalent for the purpose of solidifying and strengthening the whole structure
as set forth.
Dated this 28th day of December 1891.
J. C. CHAPMAN, C.P.A.,
70, Chancery Lane, London, Agent for Applicant.