An Automatio Temperature Regulator for Incubators and other Purposes.
Year: 1889

page_text: Date of Application, 12th Apr., 1889
Complete Specification Left, 31st Dec., 1889-Accepted, 1st Feb., 1890
PROVISIONAL SPECIFICATION.
An Automatio Temperature Regulator for Incubators and other
Purposes.
I, JOSEPH DURNFORD of 16 Fleming Street Kingsland Road Hoxton London Smith
and Iron plate worker, do hereby declare the nature of this invention to be as
follows:-
This invention is specially designed to effect the regulation of temperature in
artificial incubators, and is also applicable with modifications in the fittings to regulate
the temperature in any confined space which is heated artificially or otherwise.
It consists of a strip or trough of thin zinc one end of which is fastened to an iron
frame work. This iron frame entirely surrounds the zinc, and is fitted at one end
with a ledge on which is a stop. This ledge is beneath the level of the zinc. An iron
rod with a broadened end turned down at right angles to its length which I will call
a foot is then placed over the zinc in such a way that while the outer extremity of
its foot bears against the stop the inner side of the foot a little higher up receives
the impact of the end of the zinc plate, suitable cross stays or wires are 'provided to
connect the sides of the frame and support the zinc.
The action takes place by the elongation of the zinc plate caused by the increasing
heat of the atmosphere around the regulator, which can be adjusted to act at any
required temperature.
In the case of incubators the desired temperature is about 104 degrees. The
regulator being adjusted by leaving the necessary distance between the end of the
zine and the foot of the rod; when the temperature rises above the required limit
it will press against the foot and thereby elevate the further end of the Iron rod
attached to it.
This end of the rod is connected by a cord or wire to a balanced valve which when
rising it opens automatically, admitting cool air until the temperature falls to the
required point when the zinc plate contracts and lowers the rod which closes the
valve.
The zinc plate or strip can be fluted or corrugated to give it stiffness and
surface.
It must not be made of thick zine or it will not be sufficiently sensitive. I have
found the trough shape with sides turned up about half an inch and the ends open,
very suitable.
The regulator should be suspended on stays or supports over the eggs, so that it
may ensure their being kept at the proper temperature.
Similarly my automatic regulator may be employed to regulate the heat in
greenhouses or bedrooms and in other places where heat is likely to be in excess.
Dated this 12th day of April 1889.

page_text: COMPLETE SPECIFICATION.
70A
An Automatic Temperature Regulator for Incubators and other
Purposes.
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I, JOSEPH DURNFORD of 16 Fleming Street, Kingsland Road, Hoxton, Smith
and Tin-plate Worker, do hereby declare. the natures of this. invention CandAint what
manner the same is to be performed, to beuparticularly described and ascertained
in and by the following statement: 61 to cool.I
1. This invention is specially designed to effect the automatic regulation of
temperature in artificial incubators, and is also applicable with modifications">lin
the fittings, to regulate, the temperature, in any confined space whether heated
artificially, or otherwise...
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It consists of a Plate or trough of thin zinc, one end of, which is fastened to an
iron; frame, work, the other end, being left free to expand. The iron frame. entirely
surrounds and supports the zinc and is fitted at, one, end, with, a ledge on which is;a;
stop.
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This ledge is at the free end of the zinc plate but is beneath, the level of, the zinc.
An iron rod with a broadened end, which I will call a foot, and which foot is turned:
down at right angles to the rod's length is then placed over the, zinc in such a way
that while the outer extremity of the foot rests, on the ledge, and bears, against the
stop fixed thereon, the inner side of the foot a little; higher up receives; the impact of
the end of the zinc plate. Suitable cross stays or wires are provided, to connect the
sides of the frame and support the zinc,
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I will now describe the invention as set forth in the accompanying, drawings, in
which Fig. 1 shews a longitudinal elevation of the regulator with the front of the
frame, left out to shew the action of the zinc plate. This regulator is fitted..with a
vertical rod F and lever G to shew one method of application.
.
Fig. 2. shews, a plan view of the Regulator..
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Fig. 3. shews an elevation of the Regulator with the Iron Rod, C, attached directly:
to the cord of a vertical door.
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A, is the Iron, frame. B, is the zinc plate C, is the iron rod which receives the
pressure of B, at, D. E, is the ledge and stop at the end of A. F, is a vertical rod,
connecting the end of C, to the balanced horizontal lever, G, and having an adjustable,
nut ZH is the, balance weight. I, is a set screw and sleeve, for adjusting the
length of the arm G. K, is the cap which closes or opens the tube L. M. is the
Incubator box with an upper space O for Hot water. N. is the tray for eggs.beneath
the regulator.
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It will be seen that the action takes place by the elongation of the zinc plate, B
caused by the increasing heat of the atmosphere around, the regulator which can
be adjusted at, D, or when, F, is used at, Z, to act at any required temperature.i
In the case of incubators the desired temperature is about 14 degrees. The
regulator,being adjusted by leaving the necessary, distance between the end of the ging
and the foot of the rod at D, when the temperature rises above the required limit, it
will press against, the foot, and thereby elevate the further end of the iron rod, C,
attached to it. This end of the rod may be connected by a cord or wire to a balanced
cap or valve, K, as shown in Fig 3 or by a vertical rod to a balanced horizontal
lever which sustains a similar cap as shewn in Fig 1, which as it rises it opens
automatically admitting cool air or allowing heated air to escape until the temperature
falls to the required point, whereupon the zinc plate contracts and lowers the rod
which closes the valve.
10
The zinc plate or strip can be bent, fluted or corrugated to give it stiffness
and surface.
It must not be made of thick zinc or it will not be sufficiently sensitive. I have
found the trough shape with sides turned up about half an inch and the ends open
very suitable.

page_text: The regulator should be suspended on stays or supports over the eggs so that it
may ensure their being kept at the proper temperature.
Similarly my automatic regulator may be employed to regulate the heat in green-
houses, or bedrooms, and in other places where heat is likely to be in excess by
uncovering apertures which admit external air.
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
An automatic thermo-regulator consisting of a sensitive zinc plate so arranged that
its expansion under the influence of heat raises a lever, and thereby opens a balanced
valve cover, or operates any other suitable mechanical device, as herein described and
set forth.
S. S. BROMHEAD,
97, Newgate Street, London, E.C., Patent Agent.