Heat Regulator for Incubators and other Heat Chambers for Industrial and Scientific Purposes.
Year: 1897

page_text: Date of Application, 8th Feb., 1897-Accepted, 22nd May, 1897
COMPLETE SPECIFICATION.
Heat Regulator for Incubators and other Heat Chambers for
Industrial and Scientific Purposes.
I, PETER JENSEN of 77 Chancery Lane London Chartered Patent Agent do hereby
declare the nature of this invention, a communication. to me from abroad by Erich
Sartorius of Göttingen German Empire Engineering Draughtsman, and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :—
This invention consists in a heat regulator for incubators and other heat chambers
for industrial and scientific purposes whereby the heat chamber may be brought to
any desired temperature and kept at a constant exact and even heat, which
by a direct acting compensating device in combination with the regulator.
attained
Fig. 1 of the drawing is a longitudinal section through an incubator and Fig. 2
a cross section, and Figs. 14 and 2 are enlarged details views.
9,
The incubator consists mainly of the outer shell a with the inner lining a¹ of non-
conducting material, the boiler b, the drawer c for receiving the eggs e which are to
be hatched, the air moistener d, the lamp f, the chimney from the heating flue
the outlet i and the compensating device of special construction which causes the
automatic opening or closing of the chimney h and the outlet i by means of a pivoted
column w acting on a beam k, and as its point of action lies very near the fulcrum of
the beam by a so great leverage, that the least alteration of the elliptical compensating
spring causes a considerable stroke of the beam and a consequent visible raising or
lowering of the covers 3 and 4 by an alteration of only 16° C. in the hatching
space, so that the temperature can be accurately regulated in the interior of the
apparatus or be kept within definite bounds.
The new regulating or compensating device consists of the beam k, the prolonga-
tions and m of which carry the covers k³ and k, of the standard n which at its
lower end is provided with a divided plate o, that engages with a groove in the
brass knob q, and of the compensating double spring in the hatching space, said
spring being fixed to a bearing's on a pipe t which is screwed into the knob 9.
The beam is specially constructed for the purpose; it does not as heretoforo
play on gudgeons but on quite small hard pointed steel screws k', which serve for
vertical adjustment of the beam and have their bearings in carnelion stones that are
let into the standard n. The effect of this arrangement is to increase the sensitiveness
of the beam and to reduce the friction to a minimum. The beam has one of its
pointed screws working in a cone recess and the other in a slit, whereby it is
prevented from being displaced and a certainty of action is ensured. Towards the
lamp side and close by the bearing points of the beam k a recess k² is provided in
the latter for receiving the point of the pivot wr. The recess is so deep that it is
in a line with the points of the bearing screws k' and the fixing points of the two
covers 3 and 4 for the lamp chimney and the outlet i respectively. The counter-
weight on the beam k serves to produce equilibrium and to adjust the centre of
gravity of the beam.
The double compensating spring is fixed to the bearings and consists of steel wire
and sheet brass. The arrangement is as follows: Upon two strips of sheet brass are
soldered steel wires lengthwise at equal distances, the brass strips are then united at
the ends so that they lie towards the outside from each other, while the steel wires lio
opposite or towards the inside.

page_text: Every chango in temperature will thus produce a moving apart or a moving
towards cach other of the springs r and thereby the middle of the spring rises by
increase of heat and falls by decrease of heat.
In the centre of the upper part of the spring is provided a centre point and the
pivot or pivoted column w has a recess for resting thereon so as not to slip off while
its upper pointed end rests in a recess in the beam k.
The pivot w transfers every change in temperature to the beam k, and the long
end of the latter will therefore rise by the expansion of the spring and drop by the
contraction. By the double arrangement of the spring and the great leverage of
the beam the temperature of the hatching space can thus be regulated to a
minimum..
The adjustment of the regulating device is done by the knob q which by its screw
thread can lift or lower the tube t and thereby change the distance between the
compensating spring r and the beam a.
As soon as the proper heat has been reached, by the water heated by the lamp the
knob g is screwed up or down until the cover k³ rests lightly on the chimney hand
the cover comes against the inside of the opening in the cap over the outlet i.
If the regulating device has been set and the heat rises in the hatching space, the
compensating spring will rise whereby the long end of the beam k will be raised
by means of the pivot w. The chimney will then be opened by the lifting of the
cover over the lamp so that warm air escapes directly and the water cools down in
the boiler b as it receives no influx of beat. But the cover or valve k is at the same
time lowered thus leaving a space between it and the cap on the outlet i whereby the
superfluous heat and the bad air in the hatching space will escape. When the
spring has cooled down the two covers k³ and close so that the heat of the lamp
again heats the water for heating the hatching space. Thus a permanent, exact, and
even heating of the hatching space is effected.
The above described regulating device is applicable to all heating chambers
requiring exact regulation, to incubators for eggs, bacilli and bacteria and other
scientific and industrial apparatus.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
:-
1. Heat regulator for incubators and other heat chambers characterized by a
compensating double spring in the interior of the chamber or oven, from which
spring minute variations in the temperature are transferred directly by a pivoted
column to a vertically adjustable balanced swinging beam in such manner that a very
small change in the spring effects a great movement of the beam and greatly
influences the automatic opening and closing of the chimney opening and the outlet
opening from the hot chamber, whereby a permanent, exact and even heating of said
chamber is effected substantially in the manner described with reference to the
accompanying drawing.
2. The construction of heat regulating device shewn in the drawing as applied to
an incubator.
Th 11
1
1007
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.