Improvements in or connected with Heat Regulators for incubator
Year: 1897

page_text: Date of Application, 16th Oct., 1897
Complete Specification Left, 18th July, 1898-Accepted, 10th Sept.,
1898
Improvements in or connected with Heat Regulators for incubator
I, JOHN BUCKINGHAM EVERALL, of No. 9, Andoe Road, Battersea, in the
County of London, Hydrometer and Thermometer Manufacturer, do hereby
declare the nature of this invention to be as follows:-
This invention relates to improvements in or connected with heat regulators
for incubators.
Incubators are generally heated by means of water contained in a chamber
located above the incubating chamber and heated by the aid of a lamp or the
like and the temperature in the incubating chamber is regulated by means of
a valve which at the times required opens communication between the incubating
chamber and the outer air.
This regulating valve is, in some cases, actuated by means of an expansible
chamber suspended in a frame within the incubating chamber and partially
filled with liquid or expansible fluid and the frame is carried by a tubular way
passing through the hot water chamber.
This expansion chamber by the expansion of the contained fluid, or by the
vapourisation thereof is expanded and through a vertical rod impinging thereon
and passing through the tubular way acts upon a scale beam or lever furnished
with a regulating weight and which lever in turn is connected with the relief
valve.
The device, hereinbefore described, although to some extent answering its
purpose, is liable to fail by reason of the heat from the hot water chamber being
communicated through the tubular way and vertical rod. or through the
tubular way and frame to the expansion chamber with the result that the
relief valve is caused to act when the temperature within the incubating chamber
does not exceed the required standard.
Now, the object of the present invention is to obviate the difficulty above
pointed out by insulating the parts and thereby ensuring the regular and correct
working of the device.
In carrying the invention into effect, the expansion chamber is insulated
from the tubular way and the frame by wood, tale or other suitable heat non-
conducting material.
For this purpose, the expansion chamber is provided on its underside with
a stud of wood or other suitable heat non-conducting material shaped to fit into
the usual step in the frame, thus completely insulating the expansion chamber
from the frame, and on its upper side the expansion chamber is furnished with
a recessed stud or step of wood or other suitable non-conducting material into
which the end of the loose vertical rod is received, thereby insulating the ex-
pansion chamber from possible connection with the tubular way.
Instead of forming the last mentioned stud or step of wood, it may be formed
of metal or other suitable material, in which case the loose vertical rod would be
wholly or partially formed of a suitable non-conducting material.

page_text: Or, the object of the present invention may be wholly or in part effected by
bushing or lining or covering the tubular way with wood or other suitable non-
conducting material.
To render the expansion chamber more susceptible to variations in the
temperature of the incubating chamber, two or more expansion chambers of the
nature herein before referred to are arranged one above the other and are con-
nected together with a small space between them.
By the means herein before described. the transmission of heat from the heating
chamber to the expansion chamber is avoided, and the proper regulation of the
heat is ensured.
Dated
1CAL
1
VAUGHAN & SON,
Agents for the Applicant.
Improvements in or connected with Heat Regulators for Incubators.
I, JOHN BUCKINGHAM EVERALL, of No. 9, Andoe Road, Battersea, in the
County of London, Hydrometer and Thermometer Manufacturer, 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:
My said invention relates to improvements in or connected with heat regulators
for incubators.
Incubators are generally heated by means of water contained in a chamber
located above the incubating chamber and heated by the aid of a lamp or the
like, and the temperature in the incubating chamber is regulated by means of
a valve which at the times required opens communication between the incubating
chamber and the outer air.
This regulating valve is, in some cases, notuated by means of an expansible
chamber suspended in a frame within the incubating chamber, and partially
filled with liquid or expansible fluid, and the frame is carried by a tubular way
passing through the hot water chamber.
This expansion chamber, by the expansion of the contained fluid, or by the
vaporization thereof, is expanded, and, through a vertical rod impinging thereon
and passing through the tubular way, acts upon a scale beam or lever, furnished
with a regulating weight, and which lever in turn is connected with the relief
valve.
The device, hereinbefore described, although to some extent answering its
purpose, is liable to fail by reason of the heat from the hot water chamber being
communicated through the tubular way, and vertical rod, or through the
tubular way and frame, to the expansion chamber, with the result that the
relief valve is caused to act when the temperature within the incubating chamber
does not exceed the required standard.
Now, the object of the present invention is to obviate the difficulty above
pointed out, by insulating the parts, and thereby ensuring the regular and correct
working of the device.
In carrying the invention into effect, the expansion chamber is insulated
from the tubular way and the frame by wood, tale or other suitable heat non-
conducting material.
For this purpose, the expansion chamber is provided on its underside with
a stud of wood or other suitable heat non-conducting material shaped to fit into 5

page_text: the usual step in the frame, thus completely insulating the expansion chamber
from the frame, and on its upper side the expansion chamber is furnislied with
a recessed stud or step of wood or other suitable non-conducting material, into
which the end of the loose vertical rod is received, thereby insulating the ex-
pansion chamber from possible connection with the tubular way.
Instead of forming the last mentioned stud or step of wood, it may be formed
of metal or other suitable material, in which case the loose vertical rod would be
wholly or partially formed of a suitable non-conducting material.
Or, the object of the present invention may be wholly or in part effected by
bushing or lining or covering the tubular way with wood or other suitable non-
conducting material.
To render the expansion chamber more susceptible to variations in the
temperature of the incubating chamber, two or more expansion chambers of the
nature hereinbefore referred to are arranged one upon the other, and are con-
nected together with a small space between them.
And, in order that the said invention may be more clearly understood and
readily carried into effect, I will proceed, aided by the accompanying drawings,
more fully to describe the same.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a sectional view representing part of an incubator having the
present invention applied thereto.
Figure 2 is a similar view of part representing a modification.
Figure 3 is a similar view to Figure 1, representing a further modification.
Figure 4 is a similar view representing a further modification, and,
Figure 5 represents a modified form of expansion chamber.
In the several figures like parts are indicated by similar letters of reference.
Referring to Figure 1, a represents the water chamber of the incubator,
al, represents a passage therethrough, b, represents the frame in which is mounted
the expansion chamber c, as hereinafter described, and d, represents the vertical
rod which actuates the scale beam or lever which, however, is not shown.
The frame b, is furnished with a boss 7, at its upper part which is apertured
and threaded to screw on to the threaded end 63, of a tubular way, which
passes through the passage a¹, and at its upper end is provided with a screw
thread, upon which screws the apertured and threaded boss 66, of a fitting b³,
which carries a standard or standards 67, upon which the scale beam or lever or a
fitting carrying the said lever is centred, as is well understood.
c, represents the expansion chamber, which, on its underside, is provided with
a stud c¹, of wood or other suitable heat non-conducting material such, for
example, as vulcanised fibre shaped to fit into the usual step 6*, in the frame b,
thus completely insulating the expansion chamber c, from the frame b.
The expansion chamber c, on its upper side is furnished with a stud or step
of wood or other suitable non-conducting material which on its upper part is
recessed to receive the lower end of the loose vertical rod d, which by its upper
part actuates the scale beam or lever, which in turn operates the valve controlling
the admission of air to the incubator as is well understood, and the expansion
chamber c, is thereby insulated from possible connection with the tubular way b².
As a further precaution a disc e, of insulating material is placed between the
boss b, of the frame b, and the bottom of the water chamber a, in order to insu-
late the boss b¹, and prevent the radiation of heat from the water chamber to
the frame and possibly to the expansion chamber c.
In the example given at Figure 2, the stud c', of the expansion chamber is
formed of metal or other material and the lower part of the frame b, carries a
step, of non-conducting material, and in this case the stud or step ², may
also be of metal but the loose vertical rod d, is assumed to be formed either
wholly or partly of a suitable non-conducting material such for example as
vulcanised fibre whilst the upper part of the rod d, may, if desired, be fitted with
a cap to take the wear of the scale beam or lever.

page_text: In the example given at Figure 3, the stud c, of 'the expansion chamber 6, is
assumed to be formed of wood or other suitable non-conducting material, or it
might be of metal, and the step, might be of heat non-conducting material
whilst the stud or step e, for the loose rod d, is of metal and the insulation of
the parts is obtained by the employment of a bushing or lining f, of heat non-
conducting material within the tubular way, which effectually insulates the
loose vertical rod, from contact with either the water chamber a, the tubular
way or the frame b.
In the example given at Figure 4, the device is substantially the same as that
represented at Figure 3, with the exception that instead of arranging the non-
conducting material f, within the tubular way it is caused to encase the
tubo whilst in order to effectually insulate the fitting. 5, from the water cham-
ber a, a disc e', of insulating material is interposed between those parts.
In the example given at Figure 5, a method is shown of rendering the
expansion chamber more susceptible to the varying temperature of the incubating
chamber, and, for this purpose, two or it might be more of the the expansion
chambers c, of the nature herein before referred to are superposed one upon the
other and connected together with a small space between them, by which arrange-
ment the action of the expansion chamber will be rendered much more sensitive
than heretofore.
It will be understood that the invention may be still further modified without
departing from the spirit thereof which is essentially the insulation of the ex-
pansion chamber c, and the parts connected therewith.
By the means hereinbefore described, the transmission of heat from the
heating chamber a, to the expansion chamber c. is avoided, and a proper regulation
of the heat within the incubating chamber is ensured.
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:-
An incubator heat regulator having its expansion chamber and connected
paris protected against the transmission of heat thereto from the water chamber
of the incubator by forming parts of said heat regulator of insulating or heat
non-conducting material or interposing said material between such parts, sub-
stantially as herein shown and described.
L
T 1
1000
D
1998.
VAUGHAN & SON,
Agents for the Applicant.