Improvements in and Apparatus for Curing Smoky Chimneys and Preventing Down Draught in the Flues of Open and other Fire Places.
Year: 1886

page_text: Improvements in and Apparatus for Curing Smoky Chimneys
and Preventing Down Draught in the Flues of Open and
other Fire Places. ›
I JOHN BENNISON of 36 City Road, Manchester in the County of Lancaster,
Marble Merchant do hereby declare the nature of my said invention to be as
follows:-
This invention refers more particularly to that class of smoky chimneys arising
from down draught induced by syphonic .influence or natural air pumping owing
to the internal construction and arrangement of the building or from other causes
and consists in gathering the products of combustion together immediately over the
fire place and leading the same for a certain distance up the flue through a central
passage surrounded on the outside by a space and which has the effect of effectually
preventing down draught.
In performing my invention I employ a canopy or cover which closes in the flue
at the bottom-this canopy being fitted with one or more doors or flaps for
facilitating the cleaning out of any soot which may gather in the flue above
it. Rising from the narrow mouth of this tapered canopy is by preference a
cylindrical casing or tube arranged in two or more lengths socketted together for
the facility of introduction into the flue and which casing extends up the flue and
terminates at the top in a cone or deflector the smallest diameter of which is about
equal to that of the mouth of such casing. And in order to fix this casing in
position in the flue without brickwork I employ attachments on the outside which
may be either fixed or loose. If the latter I prefer to employ a dovetailed groove
arranged in a curvelinear direction in the side plates and into which fit the sockets
or studs which by extending outwards to the walls or brickwork of the flue so
retain the central casing or tube in position in such flue.
I prefer this casing to be fixed as near as possible in the centre of the flue to
avoid the possibility of the entrance of any currents running down the sides of the
flue and to ensure the smoke getting clear away from all deterrent influences.
Although I prefer to make the canopy and central casing of metal it will be
obvious that fire clay or any other suitable material might be employed and that
instead of being cylindrical or tubular the casing might be of rectangular, oval or
other desired cross section.
Dated this 4th J
T
1000
JOHN G. WILSON,
Agent for the Applicant.

page_text: and Preventing Down Draught in the Flues of Open and
other Fire Places.
I JOHN BENNISON of 36 City Road, Manchester, in the County of Lancaster,
Marble Merchant, do hereby declare the nature of my said invention and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement:—
This invention refers more particularly to that class of smoky chimneys arising
from down draught induced by syphonic influence or natural air pumping owing
to the internal construction and arrangement of the building or from other causes,
and consists in gathering the products of combustion together immediately over the
fireplace and leading the same for a certain distance up the flue through a central
passage surrounded on the outside by a space and which has the effect of effectually
preventing down draught.
In Figs. 1. and 2. of the accompanying drawing I illustrate by a front sectional
view and plan, my improvements as applied to an an existing flue-the apparatus
being shewn as constructed of cast or sheet metal and which may be described as
follows:-
In performing my invention I employ a canopy or cover a. which closes in the
flue at the bottom immediately above the fire place, this canopy being fitted with
one or more doors or flaps b. for facilitating the cleaning out of any soot which may
gather in the cavity above it. Rising from the narrow mouth c. of this tapered
canopy is by preference a cylindrical casing or tube d. arranged in two or more
lengths socketted together as illustrated for facility of introduction into the flue
and which casing extends up the flue and terminates at the top in a cone or
deflector e. the smallest diameter of which is about equal to that of the mouth of
such casing d. And in order to fix this casing in position in the flue without
brickwork I employ studs or attachments f. on the outside or which studs may be
hinged as indicated at f1 to the casing and by extending outwards to the walls or
brickwork of the flue may so retain the central casing or tube in position in
such flue.
I prefer this casing to be fixed as near as possible in the centre of the flue to
avoid the possibility of the entrance of any currents running down the sides of the
flue and to ensure the smoke getting clear away from all deterrent influences.
Although I prefer to make the canopy and central casing of metal as illustrated
in Figs. 1. and 2. it will be obvious that fire clay or any other suitable material
might be employed say as illustrated in Figs. 3. 4. and 5 which represent
respectively a front sectional view, a plan and a side sectional view of my
invention as constructed of fire clay or earthenware in a double socketted form
the inner casing d and outer casing d¹ being formed in one piece and connected
together by the stays g. The section of Fig. 3. is taken upon the line a-b. in
Rio 4

page_text: I prefer to make this double socketted form when to be built in the chimney
stack in course of its construction. . For existing flues I sometimes make the central
casing alone of earthenware and also if desirable use this single casing to be built
up with the chimney or flue.
In this arrangement the same letters of reference are used to denote similar parts
as in Figs. 1. and 2. and in both the action is the same and may be described as
follows:-
-
The products of combustion are carried up through the central casing d. and this
becoming heated through to the outside induces a current to set up in the
surrounding space h. outside such casing in the direction of the arrows the cool
air or other gases keeping to the outside and descending whilst the heated gases
cling to the casing d. and travel upwards as indicated.
It is found in practise that a flue so fitted with my improved internal casing as
aforesaid is an effectual preventive and cure of down draught whether induced
by syphonic influence or by natural air pumping. Instead of being cylindrical,
oval or tubular as illustrated, it will be obvious that the casing d. might be of
rectangular or other desired cross section.
Having thus particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed, I declare that what
I claim is
The use and application to the flues of fire places, of a canopy and central casing
by preference socketted together and arranged substantially as and for the purposes
herein before described and illustrated on the accompanying drawing.