Improvements in Boiling Pans.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Boiling Pans.
ROBERT BEST HELLIWELL, Engineer, 73, Wellington Avenue, Smithdown Road,
Liverpool, do hereby declare the nature of this invention to be as follows: -
My invention has for object the increasing of the efficiency of cavity melting
or boiling pans by, firstly employing in the cavity oil, grease, tallow or other
fluid which having a high boiling point can transmit a very high temperature
without itself being decomposed. Secondly, in regulating the intensity of heat
to be transmitted by inserting into the said oil, grease, tallow or other fluid,
mechanism actuating the damper of the furnace, the primary source of heat,
this mechanism is regulated in the following manner, a part of the mechanism
inserted is clogged by a metal alloy which melts at the required heat intensity,
when the alloy melts therefore it ceases to clog the mechanism which by the
action of a spring or weight automatically closes the damper preventing further
heating.
It will therefore be readily perceived that the essence of this invention con-
sists not in any particular construction of mechanism, but in firstly—the
employment of oil, grease, tallow or the like between the outer and
the inner cases of boiling pans which may obviously be of any required
shape and secondly in the controlling of mechanism actuating the
damper by means of surrounding one or more of the moving parts with
a metal or alloy which shall only permit automatic action when the latter is in
a state of fusion.
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CUMPLEIE DIECIFICATION.
Improvements in Boiling Pans.
I, ROBERT BEST HELLIWELL, of 73, Wellington Avenue, Smithdown Road,
Liverpool, Engineer, do hereby declare the nature of this 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 relates to boiling pans, for boiling or melting various substances,
including resin, pitch, soap, sugar, tallow, oils, and the like; and consists in
providing means whereby the substance which is being boiled or melted is
prevented from becoming over-heated or burned.
Means for preventing the overheating of the contents of boiling pans, according

page_text: to this invention, consist firstly, in constructing such pans with a false bottom,
or with inner and outer shells, and in charging the cavity thus formed with oil,
grease, tallow, or their equivalent, whose boiling point is relatively higher than
the boiling point of the contents of the pan, and, secondly, in disposing within
such cavity and immersed in such oil, grease, or tallow having a high boiling
point, a device, which will-when .heated to a certain temperature-automatically
close a damper or otherwise prevent the pan from becoming further heated.
In putting my invention into practice I employ two pans, one within the
other, with a space or cavity between each; or I may employ a single pan having
a double shell. The cavity thus existing between the two pans, or between the
shells of a single pan, is filled or partially filled with oil, grease, or tallow, or
their equivalent, having a higher boiling point than the contents of the pan.
Access to such cavity, for charging or re-charging purposes, is obtained by
removing the inner pan, or by means of a filling aperture or pipe; and an over-
flow or escape pipe is also provided when necessary.
By thus interposing between the fire or heating medium and the contents of
the pan, a jacket filled with oil, grease, tallow, or their equivalent, having a
higher boiling point than the contents of the pan, I am able to melt or boil the
latter without danger of overheating or burning them.
To prevent the oil, grease, or tallow, having the higher boiling point, from
becoming itself overheated, and also to limit or control the temperature of the
substance or liquid being melted or boiled, I insert in such outer jacket a device
wherein a metal or alloy of low melting point is employed to temporarily clog
or retard a moving part thereof, which device controls a damper or other device for
checking the fire by which the pan is heated.
Such a device may take the form shewn in the annexed drawing. Figure 1
being a plan and Figure 2 a cross section on linc A B Figure 1. Immersed in
the oil, grease or tallow of such outer jacket a is a tube b having a closed end,
and into the open end of this tube is inserted the end of a rod or spindle c which
passes out of the jacket and is connected-by a cord d or any suitable arrange-
ment of levers with the axle of a damper e placed in the flue or uptake f of the
fire which heats the pan. Into this tube is run-in a molten condition-a metal
or alloy g having a low melting point, such as tin or an alloy thereof. It will
be seen that when such metal or alloy solidifies, the rod or spindle c will be held
rigidly in the tube. The damper is closed by a weight hand is held open by
such rigidly held spindle. Now, if the temperature of the substance or liquid
in the outer jacket a reaches the melting point of such metal or alloy g, the
latter liquifies and permits the hitherto rigidly held spindle to revolve therein,
thus allowing the weight h to close the damper. The spindle c is then discon-
nected from the damper and is rotated in its tube to its former position, so that
as the temperature of the jacket decreases, and the metal or alloy again solidifies,
the spindle is again held rigidly in its former position. The damper may then
be reopened by hand and reconnected with the spindle c.
It must however be understood that I may employ any other suitable device
for controlling the damper, in which device a metal or alloy is used to temporarily
clog or retard a moving part thereof, such part being released upon the metal or
alloy becoming fused.
Instead of employing the controlling device above described, or a similar con-
trolling device, for controlling the flue of a fire it may control the air supply
thereto; or in the case of pans fired by liquid or gaseous fuel, such device will
control the supply of such liquid or gaseous fuel.
It will be seen that the essentials of my invention are:-1
-the interposition
between a boiling pan and its heating medium, of a chamber or cavity filled with
oil, grease, tallow, or their equivalent, having a higher boiling point than the
boiling point of the contents of the pan, and the disposition in such chamber or
cavity, of a device-released by heat-for controlling the further heating of the
pan.

page_text: 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. The employment in a false bottom, jacket, or cavity of a boiling pan, of oil,
grease, tallow, or their equivalent, having a higher boiling point than that of
the contents of the pan, whereby the latter are prevented from becoming burned
or overheated, substantially as described.
2. The disposition in a false bottom, jacket, or cavity of a boiling pan, con-
taining a substance or liquid having a higher boiling point that that of the
contents of the pan, of a device for preventing or controlling the further heating
of such pan, comprising a moving part which is temporarily clogged or retarded
by a metal or alloy of low melting point, substantially as described.
VITIS
On day of oanuary
J. A. COUBROUGH,
Registered Patent Agent (Qual. by Exam.),
10, St. George's Crescent, Liverpool,
Agent for the Applicant.