AUTOMATICALLY VENTILATING & REGULATING THE TEMPERATURE OF HOT-HOUSES, WORKSHOPS, AND OTHER BUILDINGS
Year: 1885

page_text: nouses and other Bulldings.
JÖRGEN HANSEN, Watchmaker 2 Braemar Villas West Green Road Tottenham
and FREDERIK LARSEN, of 3 Highwick Road, South Tottenham, Gardener, in
the county of Middlesex do hereby declare the nature of my invention for
AUTOMATICALLY VENTILATING & REGULATING THE TEMPERATURE OF HOT-HOUSES,
WORKSHOPS, AND OTHER BUILDINGS to be as follows :—
B
The machine, to be made of brass and steel in the form of a horseshoe or any
other convenient shape, the underside or inside being a flat bar of steel or iron, to
the outside of which is fixed a bar of brass of double the thickness. One end of
the compound bar so formed is firmly, fixed to a convenient place in the hot-
house etc. the free end connected with the ventilating sashes by means of a cord
and pulleys or where necessary by levers. Any increase in the temperature acting
unequally on the two metals of the Compound bar causes the free end to move,
thereby opening the ventilators and as the temperature of the hot house etc, being,
by that means reduced, the bar in resuming its normal condition gradually closes
the ventilators and thus an equal temperature is maintained."

page_text: оператоi alu 1отрогать подшают ior по
Houses and other Buildings.
We JÖRGEN HANSEN of 2 Braemar Villas, West Green Road Tottenham Watch-
maker and FREDERIK LARSEN of 3 Highwick Road South Tottenham gardener
both in the County of Middlesex 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:-
According to this invention we provide automatic regulation of the temperature
in a hot house, green house or other building by the employment of an automatically
acting and conveniently adjustable ventilating appliance, so constructed that the
heat in the building shall not at any time exceed a certain degree on the ther-
mometer and so that the apparatus can be adjusted to act according to any
thermometer degree which may be determined upon. We thus preserve an equable
and suitable temperature in the building which especially in hot houses is of great
importance, prevents injury to costly plants as against the danger from inattention
to the proper ventilation and: temperature required, and saves the attendants much
trouble and anxiety.
The main part of the apparatus consists of a compound bar, composed of two
strips or pieces of suitable metals such as brass and steel or brass and iron which
expand very unequally by beat, the two metal pieces of such compound bar being
soundly brazed or otherwise completely united so as to form as it were one solid
bar, which is bent in the form of a horse shoe (or straight or of any other con-
venient shape) the under or inner side being a flat bar of steel or iron to the
outside of which is fixed and united a bar of brass of considerably greater thick-
ness, say about double or more, so as to have more power than the steel or iron
when the compound bar by the influence of temperature is exposed to bending
moment or flexure.
.
'
1
L
430
In the accompanying drawings Figure 1 is a side view of the apparatus as
applied to operate, windows in a hot house, and Figure 2 is an end view. A is a
compound horse-shoe shaped bar consisting of steel or iron inside and brass outside
both firmly united, one end of the bar is by a bracket B and plate and bolts fixed
firmly to the wall of the hot house (or it might be to a pier in the ground or
floor, or in any other convenient manner or position). To the free end of the bar
which by preference is much longer than the fixed end so as to afford a convenient
length of stroke for the apparatus, is jointed the rod C, which is made in two
parts formed with left and right hand screw thread and uniting length adjusting
socket or regulator. This rod C is jointed to the double armed lever D near its
fulcrum D', while the outer end of the lever D by a rod E is connected to a rod F
which by rods H H is connected to the ventilating windows G G. These latter
are by preference as shown centre pivoted whereby we gain an even balance and
also a good mode of ventilation as these windows when open admit the cold air
at the lower aperture and let the warm air escape at the upper aperture. But
any other form of windows, ventilators or valves may be used. The weighting

page_text: part of the weight of the parts D E F and H is by preference balanced by the
weight I. The working parts must of course be arranged according to local
circumstances and the above is only a suitable example. Sometimes heavy un-
balanced windows may be balanced by counterweights cords and pulleys.
Any increase of temperature above the normal one to which the apparatus is
adjusted by means of the socket C (or any other equivalent device) will tend to
lengthen the bar A, but as the brass part of it expands much more than the steel
or iron part, the brass part being thicker will overcome the thinner and weaker
iron or steel part thus causing the horse shoe bar A to alightly and gradually
collapse so that the two limbs approach each other whereby the lever D is pulled
down, its outer end pulling the rod E down and thus by the rod F and rods H H
tipping the ventilators G G into the dotted open position or any other more or
less open position. As the temperature in the conservatory thus becomes lowered
the horseshoe bar gradually resumes its original or normal form, whereby the
ventilators gradually close again. A practically equal temperature is thus main-
tained. K is a thermometer for adjusting the apparatus to work to any desired
heat degree. The bar A might be straight as stated and might be fixed at one
end while the other or free end would be connected to the windows or ventilators.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that
what we claim is:
First. The application of.
.a horseshoe shaped or other bar composed of two
pieces of intimately united metals of unequal expansion by heat to the automatic
opening and shutting of windows or ventilators of any kind for hot houses and
other buildings substantially as set forth.
Second. The combination with the compound bar firstly claimed of a regulator
or means for adjusting the same to act when the temperature in the building
reaches a pre-determined degree.
Third. The construction and arrangement of parts shown and described.