Improvements in Chimney Pots for Preventing Down Draughts.
Year: 1898

page_text: Improvements in Chimney Pots for Preventing Down Draughts.
We, JOHN HENRY OXLEY, Foreman, and ROBERT WILLIAMSON, Joiner, both of
Commondale, near Grosmont, in the County of York, do hereby declare the nature
of this invention to be as follows:-
Our invention relates to chimney pots in the construction or arrangement of
which we introduce certain novel features with a view of intercepting those down
draughts which cause what is known as a smoky chimney.
In carrying out our invention we recognise the fact that under certain circum-
stances it is not possible to prevent a down draught from entering the top of a
chimney and our invention is confined mainly to suitable means for diverting
this down draught to suitable outlets in such a manner that it does not obstruct
the discharge of the smoke from the chimney flue but diverts it through the same
outlets in the manner hereinafter described. But our invention comprises certain
other novel features as hereinafter described.
A chimney embodying our invention consists of three parts namely: the inner
pot; the casing and hood or baffle which we will designate a wind guard.
The inner pot is encircled near the top with a collar or ring ledge which fits
the casing and the casing is supported on brackets or steps so that an inlet space
exists between the casing and the inner pot which space is terminated upwardly
by the collar or ring ledge but communicates by openings just below the said
collar or ring ledge into the chimney flue. But in order to divert the down
currents entering the chimney pot from above we provide a hood or baffle fixed
above the inner pot so that the currents from the chimney which carry the smoke
out with them can readily effect their escape without obstruction from a down-
ward pressure which has entered the chimney pot at a higher level but which is
diverted by the said hood or baffle to the outlets provided in the casing.
The hood or baffle constituting what we term the wind guard consists of a cap
or hood proper set above an annular space and a sloping or overhanging collar
below which covers another annular space, the object being to furnish a suitable
and sufficient outlet for the smoke from the chimney without admitting the down-
ward currents of the outside air which by our improvements we expect to divert
outwards through the casing.
n
001
1000
G. J. CLARKSON,
Charter Patent Agent, Stockton-on-Tees & Hull,
Agent for the Applicants.

page_text: Improvements in Chimney Pots for Preventing Down Draughts.
We, JOHN HENRY OXLEY, Foreman, and ROBERT WILLIAMSON, Joiner, both of
Commondale, near Grosmont, in the County of York, do hereby declare the nature
of this invention and in what maner the same is to be performed, to be
particularly described and ascertained in and by the following statement:―
Our invention relates to chimney pots in the construction or arrangement of a
which we introduce certain novel features with a view of intercepting those down
draughts which cause what is known as a smoky chimney.
In carrying out our invention we recognise the fact that under certain circum-
stances it is not possible to prevent a down draught from entering the top of a
chimney and our invention is confined mainly to suitable means for diverting
this down draught to suitable outlets in such a manner that it does not obstruct
the discharge of the smoke from the chimney flue but diverts it through the same
outlets in the manner hereinafter described. But our invention comprises certain
other novel features as hereinafter described
A chimney embodying our invention consists of three parts, namely: the inner
pot, the casing; and a hood or baffle which we will designate a wind guard.
The particular arrangement and combination of parts which enable a chimney
pot to effect the object of our invention in the aforesaid manner will be under-
stood from the following description taken with reference to the accompanying
drawing which illustrates such a chimney in elevation in Fig. 1 and in section
in Fig. 2. In these Figs., 1 is the inner pot: 2 the casing: and 3 the hood or
baffle. The inner pot or hood 1 is encircled near the top with a collar or ring
ledge a which fits into the casing 2, and the casing 2 is supported on brackets
or steps b so that an inlet space exists between the casing and the inner pot,
which space is of the kind usually provided where a casing such as 2 is placed
over an inner pot such as 1. But instead of the space continuing upwards until
merged in the chimney outlet it is terminated upwardly by the collar or ring
ledge a, but communicates by openings c just below the said collar or ring ledge
into the chimney flue. In order to divert the down currents entering the chimney
pot from above we provide the hood or baffle 3 fixed above the inner pot, the
special design of which is adapted to enable the currents from the chimney which
carry the smoke out with them to readily effect their escape without obstruction
from a downward pressure which has entered the chimney pot at a higher level
but which is diverted by the hood or baffle to the outlets & provided in the casing.
The hood or baffle 3 constituting what we term the wind guard consists of a cap
or hood proper e set above an annular space f and an overhanging baffle or double
cone g the inverted cone of which covers or forms another annular space f¹ the
object being to furnish a suitable and sufficient outlet for the smoke from the
chimney without admitting the downward currents of outside air which by our
improvements we divert outwards through the openings d in the casing. The
inner pot 1, casing 2 and hood 3 are or may be detachable, the double cone g being
secured by cross webs to the hood or cap e. The several parts being arranged
and combined as shown and described, they are intended to effect these several
purposes, viz: the collar or ring ledge a prevents the down draughts from
entering or occupying the annular space between the inner pot 1
and the casing 2; consequently air is drawn in from below to
pass into the chimney flue through the openings c and SO to promote
the upward currents which carry off the smoke or if the tendency of
the down draughts to choke the chimney is greater than usual the smoke can
effect its escape through the openings e and the annular space below. With the

page_text: ordinary condition of down draughts the smoke which does not escape past the
double cone and out at the chimney top is carried down through the outlets d, and
not back into the chimney flue. The smoke has therefore three outlets one or
other of which will be available according to the conditions affecting the draught
of the chimney and varying mainly with the state of the weather.
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:
1. In a chimney pot consisting of an inner pot, a casing and a hood the provision
as part thereof of a collar or ring ledge such as a, openings into the chimney
such as c, the outlets d and the double cone g all combined and arranged sub-
stantially as and for the purpose as hereinbefore described with reference to the
accompanying drawing.
2. An improved chimney pot provided with a combination of devices and outlets
arranged and operating substantially as hereinbefore described with reference to
the accompanying drawing.
G. J. CLARKSON,
Chartered Patent Agent, Stockton-on-Tees and Hull,
Agent for the Applicants.