Electric Fire Indicator.
Year: 1890

page_text: Date of Application, 4th Oct., 1890
Complete Specification Left, 25th Oct., 1890-Accepted, 29th Nov., 1890
PROVISIONAL SPECIFICATION.
Electric Fire Indicator.
I THOMAS RALPH Douse of 8 Holborn Viaduct, City of London, Engineer, do
hereby declare the nature of my said invention to be as follows:-
This invention has for object a fire indicator or signal capable of, by heat expansion
of air, alcohol, mercury, or other agent hermetically enclosed in a box, causing
electric circuit to be closed between a battery and an alarum.
The box can be adjusted in its frame and be fixed in the adjusted position to suit
the degree of heat at which the sound shall be produced.
The box is composed of two discs connected by a band and a stud projects from one
disc for adjustment towards a plate by which circuit can be completed, the other disc
having a screw adjustable in a hoop or bridge and fixable by a nut. The band has
thermo markings in two circles and a pointer in the loop of the bridge enables the box
to be set for the required degree of heat.
The apparatus is intended for stores, depôts, warehouses, shops, public and private
dwellings and can be fixed to a ceiling and the conducting wires connecting same
can be to or from any convenient place where help or assistance can be readily
obtained.
The apparatus is small and very compact, it can be placed in any out of the way
position and be always ready to sound an alarum shortly after the outbreak of a fire in
the room in which it is fixed.
Dated this 4th day of October 18.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said T. R. Douse,
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said T. R. Douse,
COMPLETE SPECIFICATION.
Electric Fire Indicator.
I. THOMAS RALPH DOUSE of 8 Holborn Viaduct, City of London, Engineer, do
hereby declare the nature of my 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 has for object a fire indicator or signal capable of, by heat expansion
of air, alcohol, mercury, or other agent hermetically enclosed in a box, causing electric
circuit to be closed between a battery and an alarum.
The box can be adjusted in its frame and be fixed in an adjusted position to suit
the degree of heat at which the sound shall be produced.
The apparatus is intended for stores, depôts, warehouses, shops, public and private
dwellings, and can be fixed to a ceiling or a wall close to a ceiling and the conducting
wires connecting same can be to or from any convenient place where help or assistance
can be readily obtained.
The apparatus is small and very compact, it can be placed in any out of the way
position and be always ready to sound an alarum shortly after the outbreak of a fire
in the room in which it is fixed.
Figure
apparatus.
of the accompanying drawings is a part sectional elevation. of the
Figure 2-a perspective exterior elevation thereof, and

page_text: A is a metal base or foundation ring with perforated flange B for enabling it to
be fastened to a ceiling or wall by screws.
C is a collar formed from part of the base A and of a
ready attachment of a tube D of insulating material by screw. pins.
depth suitable for the
E. E are metal posts fixed outside on the insulated tube D by long screws F, F¹
from inside the tube D so that the threaded ends serve also for the pinch buttons G, G¹,
to travel on to fasten the ends of the conducting wires H. H'.
I is a screw pin or pillar passed through the centre of the base A and in which it
is adjustable to suit the height or length of the tube D beyond the outer end of
which the point J of the pillar projects and at such position it is locked by the
lock nut K.
L is a hoop or inverted bridge also fixed to the tube D by its outer flange M but at
the opposite end to that of the base A. This hoop has a flange M¹ for confining a
concentrically grooved metal dise N between it and the edges of the insulated tube D
in such position that the disc N and pillar point J are out of touch with each other.
P is the hermetically closed box composed of two concentrically grooved metal
plates P. P, connected at the edges by a flattish shaped band Q on which a thermo-
meter scale is printed or marked, the divisions or markings between each degree being
scientifically prepared to correspond with the pitch of the screw thread on a pin R to
which the metal plates P, P¹ are fixed, said screw working through and adjustable
in the boss S of the hoop or inverted bridge L and affixable by the lock nut T.
The degrees or markings on the band are in two circles and a pointer U on the
inner portion or bend of the hoop L will enable the adjustment to be easily determined
and the apparatus set.
The other plate P has a stud V projecting centrally from its face axially with the
centre of the disc N and of the point J of the pillar I but out of touch with the disc
in its normal position the closeness or distance being, governed, by the adjustment and
set of the box for its expansion to cause them to touch and then to press the disc into
contact with the point J of the pillar I.
W is a wire connecting the pillar with the screw F and X a wire connecting the
disc N and screw F¹.
The thermometer degrees or markings on the rim or band of the box are in two
circles divided by a line, the degrees from 70 to 140 being on the lower circle and
those from 150 to 184 on the upper circle and as the box is turned in one direction,
say to the right, the screw R turns with it and lifts the box to place the stud V nearer
to the disc N and the numerals of the required degree opposite the pointer U said box
being locked in that position by the nut T.
If the box be turned to the left it with the screw R are lowered for one of the
higher degree numerals to be opposite the pointer U and the stud V at a greater
distance from the disc N. Thus a more intense heat will be required to expand the
box to put the stud V into contact with the disc N.
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. In an electric fire indicator a box composed of two concentrically grooved
plates P, P¹, connected at the edges by the band Q, one of such plates P₁ having
a screw pin R affixed and the other a stud V both of which project from the outer
faces of the plates P. P¹, as and for the purposes specified.
2. In an electric fire indicator the hox P. P, Q, having two rows of thermometer
markings on the periphery and turnable for raising and lowering in a hoop or
inverted bridge L for adjustment to the pointer U and by the out T as set
forth.
•
3. In an electrical fire indicator the concentrically grooved disc N fixed on insulator
tube D by flange M¹ of hoop L and in a normal position out of touch with point J
and stud V as specified.

page_text: 4. In an electrical fire indicator the base A, tube D, hoop L, pointer U therein, in
combination with rotatable and adjustable box having stud V for contact (by heat)
with disc N and also screw R in threaded boss of hoop L with lock nut T as and
for the purposes set forth.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said T. R. Douse.
The 28th day of October 1890.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said T. R. Douse.