A Portable Secondary Battery Lamp for Use in Mines and other Places.
Year: 1893

page_text: Date of Application, 27th Sept., 1893
Complete Specification Left, 27th June, 1894-Accepted, 27th Sept., 1894
PROVISIONAL SPECIFICATION.
A Portable Secondary Battery Lamp for Use in Mines and other
Places.
I, VILLEROY CORNEY DOUBLEDAY, Accountant, of 37 Walbrook in the City
of London, do hereby declare the nature of this invention (a communication to me
from abroad by Max Sussmann of Neuruppin, Germany, Electrician) to be as
follows:-
The glow lamp is mounted upon the lid of a metallic box or casing containing
the secondary battery. The lid is made of ebonite or other similar or suitable non-
conducting material.
The glow lamp is mounted between an upper and a lower conical reflector, the
bases of the reflectors being respectively upon a circular metallic top disc and upon
the lid. Between the top disc and the lid there is a glass cylinder enclosing the
glow lamp and the cone reflectors and in some cases having about half of its surface
rendered opaque for instance by white paint or enamel or silvering so that the light
is thereby reflected to one side or in some cases I attach a lateral reflector to the
glass cylinder. The top disc, the glass cylinder, the glow lamp and the cone
reflectors are held together and united to the lid by means of thin metal pillars
which are screwed into the lid. The latter is united to the casing by screws, say.
two, passing through two opposite sides of the casing and entering metal lugs
secured to the lower side of the lid. The top disc is furnished with a hook for
suspending the lamp by. The battery plates are of the lightest and most efficient
construction.
In order to prevent possibility of damage to the plates by shocks I surround the
accumulator cells with rubber bands or cords or buffers which take an elastic bearing
against the enclosing metallic case. The electrical connections are made up as follows.
The connections from the filament ends of the glow lamp pass each into a helix-
wound socket-like wire. One of these is below soldered to a brass socket in which
is screwed a terminal screw for wire connection to one pole of the battery. The
other socket like wire is. led to a contact piece which by the end of a switch screw
passing transversely through the box lid and through the other terminal screw
socket can be brought in and out of connection therewith and thus close or open the
circuit.
This screw has a milled head or may be otherwise formed for a special key or
spanner for operating it by, so that a small part of a turn suffices for switching the
lamp current on or off. In order to prevent leakage of fire damp into the interior
by way of the said screw I provide an elastic washer under its head which washer
slightly compressed state to make joint before the screw is turned a little
further for making electrical connection.
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JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.

page_text: COMPLETE SPECIFICATION
A Portable Secondary Battery Lamp for Use in Mines and other
Places.
I, VILLEROY CORNEY DOUBLEDAY, Accountant, of 37 Walbrook, in the City
of London, do hereby declare the nature of this invention (a communication to me
from abroad by Max Sussmann, of Neuruppin, Germany, Electrician) and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement:-
This portable electric lamp for use in mines and other places is supplied with
current from a secondary battery contained in a box or casing. The glow lamp is
mounted upon the lid of the said casing and provided with suitable reflector appliance
and the switch is arranged in the lid.
Figure 1 of the accompanying drawings is a front elevation shewing the whole
apparatus in the form of a miner's lamp, Figure 2 is a vertical section through the
same and
Figure 3 a plan of the lid.
A is the box by preference of sheet steel containing the secondary battery B; the
battery plates are of the lightest and most efficient construction and by preference
made according to the Specifications of my Patents dated 30th March 1893
No. 6780 and 17th November 1893 No. 22053, (both being communications from
M. Sussmann).
C is the lid made of ebonite or other suitable non-conducting material.
The
glow lamp D is mounted between an upper conical reflector E and a lower conical
reflector F, the bases of the reflectors being respectively upon a circular metallic
top disc G and upon the lid C. Between the top disc G and the lid C there is a
strong glass cylinder H enclosing the glow lamp D and the cone reflectors E
and F, and in some cases having about half of its surface rendered opaque for
instance by white paint or enamel or silvering so that the light is thereby reflected
to one side, in the latter case I may do away with one or both cone reflectors; or
in some cases 1 attach a lateral reflector to the glass cylinder. The glass cylinder
or other guard made for instance of strong wire would be required in the case of a
miners' lamp, but such guard may not be needed in some other cases.
The top disc G, the glass cylinder H, the glow lamp D and the cone reflectors E
and F are held together and united to the lid C by means of metal pillars I which
are screwed into the lid. The latter is united to the casing A by screws K say
two passing through two opposite sides of the casing and entering angular metal
lugs secured to the lower side of the lid C. In order to prevent possibility of
damage to the battery plates I surround the battery cell with rubber bands or
cords M which may pass around the same horizontally or vertically or both or
I provide buffers which take an elastic bearing against. the enclosing metallic
case A.
The electrical connections are made up as follows. The connections N and O
from the filament ends of the glow lamp pass each into a helix-wound socket like
wire. Que of these is below soldered to a brass socket P in which is screwed a
terminal screw N¹ for wire connection to one pole N* of the battery. The other
socket like wire is led to an angular contact piece Q which by the end of a switch
screw R passing transversely through the box lid C and through the socket. P
for the other terminal screw N' can be brought into and out of circuit connection
therewith. This screw may have its end protruding beyond the lid and be provided
with a milled head but for a mining lamp it is preferably made so as not to protrude
and to have its end formed to suit a special key or spanner which is not in the
possession of the miner but in that of some superintending official overground and
who thereby switches on or off the current to the lamp by a small part of a turn.

page_text: C¹ is a cover turning on a centre pin and serving to give access to the switch
screw R. In order to prevent leakage of fire damp into the interior by way of
the said screw I may provide an elastic washer R' under its flange or head which
washer is in a slightly compressed state to make joint with a shoulder in the lid
before, the screw is turned a little further for making electrical connection.
The top disc G is provided with an eye G₁ an S-shaped hook S for
suspending it by.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what I
claim is :-
1. A lamp for use in mines and other places consisting essentially of a secondary
battery enclosed in a casing or box, a box lid attached thereto which carries a
glow lamp with suitable reflector appliance and wherein is arranged a switch for
turning on or off the current between battery and lamp, and as required a glass
envelope or other guard over the lamp substantially as described and shewn.
2. The box A for a secondary battery B with elastic bands M or buffers between
them in combination with the lid C, a switch arranged in the lid, a glow lamp D
fixed to the lid, and having suitable electrical connections to the switch and battery
cone reflectors above and below the lamp, a glass envelope for the lamp and
reflectors, and the columns I for holding lid, lamp, reflectors and envelope together
substantially as described and shewn.
3. The lid C in combination with the switch screw R, the terminal screw
socket P, the contact Q and the wire connections to lamp and battery substantially
as described and shewn.
4. The construction of miners' lamp shewn and described.
of June 1894.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.