An Improvement in or Addition to Electrically Operated Combination Apparatus for Domestic Use.
Year: 1888

page_text: Date of Application, 1st Dec., 1888
Specification Accepted, 22nd Jan., 1889
COMPLETE SPECIFICATION.
An Improvement in or Addition to Electrically Operated Combination
Apparatus for Domestic Use.
I, LIONEL MONTAGU DAVIS, of 2 Great Winchester Street, in the City of London,
Merchant, do hereby declare the nature of this Invention and in what manner the
same is to bo performed, to be particularly described and ascertained in and by the
following statement, reference being had to the accompanying drawings and to
the letters and figures marked thereon, that is to say :-
This invention has for its object the combination with an electrically operated
apparatus for domestic use, consisting of a swing spirit-lamp, an electric glow or
incandescence lamp, a clock, and alarm mechanism, of a fire alarm, which shall, upon
the outbreak of a fire, give a persistent intimation thereof, by means of an electric
bell connected with the said apparatus and fitted thereon, or by means of electric bells,
in connection therewith, placed in various apartments of a building.
This fire alarm is constructed in such a manner that, upon the outbreak of a fire in
the apartment within which the apparatus placed, and the consequent increase of
temperature of such apartment, a fusible pin, or short length of fusible wire, capable
of melting at a given degree of heat (say 40° C), is, by means of such heat, caused to
melt and drop from its position or seat in the apparatus. By this means a metallic
spring connected with one pole of the battery, and which had previously been held
back by the fusible pin, or short length of fusible wire is liberated, and by expanding
comes into contact with the opposite pole of the battery thereby completing the
circuit and causing the bell, or bells, to ring and arouse the inmate, or inmates, of
the apartment in which the fire has broken out; or to announce to the occupants of
another room, or rooms, that a fire has broken out in some part of the building.
And in order that my invention may be readily understood, I proceed to describe
the same with reference to the accompanying drawings which shew an apparatus
fitted with my fire alarm and arranged to intimate the breaking out of a fire in the
same apartment in which the apparatus is placed.
Fig. 1 represents a front elevation of the improved combination apparatus, Fig. 2
a plan, partly in section, and Fig. 3 a vertical section taken on the line y y of fig. 1.

page_text: Fig. 4 is a hack elevation of the said apparatus, the door having been removed in
order to shew the connecting wires and battery for operating the hereinbefore
mentioned devices.
A is the case or box, carrying the various devices, B the swing spirit-lamp, C the
glow or incandescence lamp. D the clock, E the alarm mechanism operated by the
fire alarm, or by the clock, and effecting the ringing of the bell F, and G the fire
alarm.
This fire alarm, which especially constitutes my invention may be described.
as follows:-
To the front of the case or box A I fit two terminals a, a¹, from which conducting
wires a a¹ (see fig. 4) pass to the poles of the battery Z, one of said wires (a¹) being
carried through the clock to the alarm mechanism. Extending between these
terminals is a rod b, of wood, ivory, or other insulating material, provided at its
extremities with metallic collars,c, c', to which are secured hooks, or eyes, d, d², in
electrical connection with the wires a, a', and these hooks, or eyes, engage with, and
are retained in place by, the binding screws e, el which enter the terminals and abut
against the extremities of the wires a, a¹. Through the rod b, and at a suitable point
in its length, is inserted the fusible pin f, or short length of fusible wire, which is
held in place by one end of a coiled spring 9, the other end abutting against the collar c,
and said spring is coiled around the insulating rod b. One end of this spring is always
in connection with one of the poles of the battery through the collar C, terminal
and wire a.
a,
Now, when the temperature of the apartment rises to the degree before mentioned,
the fusible pin, or wire, melts and drops out of the insulating rod; thereby liberating
the spring which, by immediately expanding, comes into contact with the opposite
pole of the battery through the collar c¹, terminal a¹, and wire a', and by thus
completing the circuit causes the ringing of the bell, or bells, as aforesaid.
Having now particularly described and ascertained the nature of my said Inven-
tion, and in what manner the same is to be performed, I declaro that what I
claim is
1. The combination, with an electrically operated apparatus for domestic use,
consisting of a swing spirit-lamp, a glow or incandescence lamp, a clock, and
alarm mechanism, of a fire alarm, substantially as hereinbefore described, and for
the purposes set forth.
2. The fire alarm, for use with electrically operated combination apparatus for
domestic use, constructed and arranged to operate as herein described and as
shewn.
Dated this 30th day of Navamban 1908