IMPROVEMENTS IN VENTILATING APPARATUS, APPLICABLE ALSO FOR PREVENTING DOWNWARD DRAUGHTS IN CHIMNEYS
Year: 1884

page_text: COMPLETE SPECIFICATION.
We, THEOPHILUS THORLEY and AUGUSTUS JOSEPH THORLEY, both of 31, St
Augustine's Parade in the City and County of Bristol, Builders and Contractors,
do hereby declare the nature of our invention for "IMPROVEMENTS IN VENTILATING
APPARATUS, APPLICABLE ALSO FOR PREVENTING DOWNWARD DRAUGHTS IN
CHIMNEYS," and in what manner the same is to bo performed, to be particularly
described and ascertained in and by the following statement thereof and the
drawings therein referred to:-
The apparatus constituting this invention is constructed of two series of vanes
or louvres arranged vertically on a baso plate around the mouth of a pipe or duct
designed to be connected to the top of a ventilating shaft or over a chimney. One
series of vanes is arranged around the mouth of the pipe or duct; the other series
is placed towards the outer edge of the base plate. The vanes of the inner series
are curved towards the pipe mouth. The vanes of the outer series are curved
towards the edge of the base plato.
The apparatus being connected to a ventilating shaft or pipe and being exposed
to the atmosphere, the heated or foul air from below rises and issues into the cage
formed by the vanes through the inner series thereof and it finds its exit with the
atmospheric current between the vanos of the outer series.
The atmospheric current which partially circulates round the space between the
two series of vanes is prevented by the inner series of vanes from entering the
pipe or duct connected to the ventilating shaft. An upward draught is induced
in the ventilating shaft or pipe in proportion to the force of the atmospheric
current.
The vanes are secured at the top to rings which extend around the apparatus
which is surmounted by a conical cover or hood.
At Fig: 1, on the accompanying sheet of illustrative drawings is represented a
side elevation of our improved apparatus. Fig: 2, represents a transverse section,
and Fig: 3 a vertical section.
Around the mouth of the pipe or duct A is arranged a series of vanes or
louvres a curved as shown, inwards. Around the outer edge of the base plate B
is arranged the series of vanes or louvres 6 curved towards the outer edge of the
plate, as shown. Both series of vanos stand upon the base plate B and aro
connected at the top to the ring C and D, Fig 3.

page_text: The channel of the apparatus corresponding to the duct or pipe A is closed at
the top by the cap E, Fig: 3, and the inclined ring F is connected to the vanes b.
The whole is surmounted by the conical cover or hood G.
The heated or noxious air or gas rising from a ventilating shaft connected to tho
pipe or duct A passes out between the vanes a, and, assuming an atmospheric
current to be acting in the direction of X to Y, the said current is deflected and
made to partially circulate the interior of the cage and finds its oxit as indicated
by the arrows shown at Fig: 2. The heated or noxious air or gas is drawn off with
the atmospheric current and an upward draught is thus induced in the duct or
pipe A increasing with the intensity of the atmospheric current.
So much of the current which passes in at X under the hood or cover G impinges
against the interior of the hood on the side opposite and is deflected to find its
exit towards Y, assisting in the creation of the upward draught in the duct or
pipe A,
The atmospheric current being, as aforesaid, excluded from the central channel
of the apparatus, downward draughts are prevented in chimneys to which tho
apparatus is also applicable.
Having now particularly described and ascertained the nature of our said
invention, and the manner in which the same is to be performed, we declare that
what wo claim is :-
The construction of the apparatus consisting of the two rows or series of curved
vanes or louvres a and b disposed around the pipe mouth or duct A, substantially
as hercinbefore described and shown on the accompanying sheet of drawings, and
for the purposes specified.
5711
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2
1001