Improvements in тепытачыць Аррации
Year: 1894

page_text: Improvements in
тепытачыць Аррации
I, WALTER JOHN THOMAS of 21, Allendale Road Denmark Hill in the County
of Surrey Engineer do hereby declare the nature of this invention to be as
follows:-
The object of this invention is to provide for the top of ventilating shafts, means
whereby not only a down dranght is prevented, but an up draught is ensured.
For this purpose I construct on the upper end of the shaft a chamber of any
Convenient height of circular or other suitable section, and of larger diameter than
the shaft within-which is a second smaller circular chamber-closed at the top
with a solid cone,
which slopes outwards from the bottom to the top-in the
slopeing sides of conical top and round the smaller circular chamber are formed' á
number of openings-to the upper edge of these openings are loosely hung light
aluminium flaps, the slightest rise in the temperature causing the flaps to open and
allow the free escape of combustion gases or vitiated air. On the occurrence of a
down draught or gusts of wind however, the outward pressure of the air upon the
aluminium flaps, on the top or windward side will cause them to close upon the
openings and thus prevent the wind penetrating into the inner chamber while
the flaps on the leeward side will not be affected by the wind and still allow free
egress of the gases.
On the top of the outer shaft or chamber I fix a dome shaped top with a central
opening in which is fixed a conical chamber the top portion equal to the area of the
inner chamber the bottom equal to the area of the outer shaft, thus reducing the
resistance and friction in the outlet which is caused by reducing the area of top of
shaft at a suitable distance from the dome top of shaft I fix-around the shaft a
cone shaped collar and outwards above the outlet I fix a concave cover in a
0. G. shaped top or cap and outwards at a given distance from the O. G. cap and
collar of shaft equal to a third more than the area of the outlet I fix a concave ring
or curtain, which forms a shield to deflect the currents of air upwards or downwards
as the case may be, in this way a vacuum is created in the chamber and an upward
current is caused in the ventilating shaft the alumiinium valves opening for the
purpose.
The bottom of the space between the outer and inner chamber is provided
with outlets at its lowest points through which can escape any water or condensation
that may penetrate into the outer shaft or chamber, to which are fixed small tubes
bent inwards to prevent the wind striking into the chamber.
This invention is applicable to all kinds of ventilating shafts whether for gas,
lamps sun lights, ventilating sewers or for any other purpose.
Dated this Twenty-eighth day of September 1894.
.

page_text: I, WALTER JOHN THOMAS 16 Cuthill Road Denmark Hill S.Elate 21, Allen-
dale Road, Denmark Hill, S.E. Gas 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 :-
The object of this invention is to provide for the top of ventilating shafts means
whereby not only a down.draught is prevented but an up, draught is ensured. For
this purpose 1 construct on the upper end of the shaft a chamber of any convenient
height of circular or other suitable section and of larger diameter than the shaft,
within which is a second smaller circular, chamber closed at the top with, a conė.
In the sloping sides of conical top and round the smaller circular chamber are
formed a number of openings; to the upper edge of these openings are loosely hung.
light aluminium flaps. The slightest rise in the temperature causing the flaps to
open and allow the free escape of combustion gases or vitiated air. On the
occurrence of down draughts or gusts of wind however, the outward pressure of the
air on the aluminium flaps on the top or windward side will cause them to close
upon the openings and thus prevent the wind penetrating into the inner chamber
while the flaps on the leeward side will not be affected by the wind and still allow
free egress of the gases. On the top of the outer shaft or chamber I fix a dome
shaped top with a central opening in which is fixed a copical chamber the top
portion equal to the area of the inner chamber, the bottom equal to the area of the
outer shaft, thus reducing the resistance and friction in the outlet which is caused
by reducing the area of top of shaft. At a, suitable distance from the dome top of
shaft I fix around the shaft a cone shaped collar and outwards above the outlet I
fix a coucave cover in an O G. shaped top or cap and outwards at a given distance
from the OG cap and collar of shaft equal to a third more than the area of the
outlet I fix a coucave ring or curtain which forms a shield to deflect the currents of
air upwards or downwards as the case may be. In this way a partial vacuum is
created in the chamber and an upward current is caused in the ventilating shaft,
the aluminium valves opening 'for the purpose.
The bottom of the space between the outer and inner chamber is provided with
outlets at its lower points through which can escape any water or condensation that
may penetrate into the outer shaft or chamber, to which are fixed small tubes bent
inwards to prevent the wind striking into the chamber.
This invention is applicable to all kinds of ventilating shafts whether for gas
lamps, sun light burner, ventilating sewors or for any other purposes.
In order that my invention may be fully understood I annex drawings to which
I now refer.
Figure 1. is a sectional' elevation of my invention applied to a chimney cowl:
Figure 2. sectional plan.
a is the outer or main cowl to which the conical chamber I is secured at n. This
chamber I carries the inner circular chamber J 'having a conical top; Lare light.
aluminium flaps or shutters hinged or pivoted to the inner chamber and covering
the openings K. C is an interual conical collar attached inside the shaft a which
has the dome, or rounded top b., E is the top of the cowl having the concave
plates d. G is an outer curved ring attached to the conical collar F by means of
the straps or rods H. M are small outlet pipes for the escape of any moisture
which may collect between the outer shaft a aud the inner chamber J. The course
of the smoke vapour or gases is shown by the arrows; the aluminium flaps allow
the passage of same as shown owing to their lightness, but upon a down draught
taking place the flaps affected by the same will be closed for the time during which

page_text: the down draught is acting. By the use of aluminium for the flaps or shutters the
corrosion caused by acide is prevented and the flaps or shutters may be bent to the
desired shape, which in the case of mica is difficult or practically impossible. It
will be seen that the employment of aluminium flaps or shutters is not confined to
chimney cowls but may be used in various ways for ventilation where hinged
flaps are employed, such as in sewers, gas lamps and other similar uses.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
In chimney cowls and such like analogous ventilating apparatus the employment
of an aluminium flap or shutter pivoted or hinged over an aperture or opening
substantially as described and for the purpose set forth.
T
1005
E. EATON,
Agent for Applicant.