Improvements in Chimney-pots and the like.
Year: 1894

page_text: Date of Application, 17th Sept., 1894-Accepted, 20th Oct.,
1894
COMPLETE SPECIFICATION.
Improvements in Chimney-pots and the like.
I, FREDERICK JAMES ORWIN of Chudleigh, Sutton, in the County of Surrey,
Gentleman 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:-
This my said invention relates to certain new and useful improvements in
chimney pots and the like, and has for its object the prevention of down draught
in domestic and other chimneys, shafts, and like structures; the said down draught
being generally produced by the action of a high wind, or current of air, or similar
cause, which, striking upon the inner surface of the chimney pot, is deflected
downwards. This, my said invention is able to prevent, and at the same time has the
further object of producing assisting and accelerating an up-draught in chimneys,
shafts, and like structures.
By the use of this my improved chimney pot, fires in grates, stoves and the like
are readily and quickly drawn up, and the "smoking" of same, due to down draught
is entirely obviated.
I now proceed to describe my said invention, reference being had to the
accompanying drawings, and to the letters and figures of reference marked thereon,
similar letters indicating like parts throughout.
Fig. 1 is a section taken from front to back of my improved chimney pot,
constructed of metal throughout.
Fig. 2 is a section of my improved pot, taken from either side.
Fig. 3 is an outside elevation of Fig. 2.
Fig. 4 is a plan thereof
This my improved chimney pot, when constructed consists of two main parts, and
firstly of an inside body or shaft A formed either of metal, or other suitable material
capable of being used in the construction of chimney pots, and having at its base a
flange A' by which it can be readily attached to the brickwork of the chimney or
like structure.
Secondly of an outer casing B, provided at its top with a basin shaped head B',
the sides of which head incline outwards at an angle preferably of about 35° with
the vertical; the effect of this head being to reflect, or strike upwards instead of
down the chimney, any current of air that may strike the chimney at an equally
great angle with the horizontal. The bottom B2 of the casing B is shaped like an
inverted tray so as to more readily induce an up-current of air between the shaft A
and casing B.
The shaft A and casing B are connected to each other by means of three or more
metal strips C and C¹ placed respectively at the top and bottom, and in between the
shaft A and casing B, and rivetted to them, as shewn in drawing, thus uniting them
together, but leaving between them, at the same time, a long annular space all
round, and for the full length, which space is preferably rather larger at the bottom,
& gradually decreases towards the top, as shewn.
If desired, I may construct the entire pot of earthenware, or similar material, and
in that case, the outer casing B is supported by means of suitable lugs, or projections
formed on the shaft A.
By the use of the two parts A and B already described, the casing B coming to
within a few inches-preferably about nine inches-of the base of the shaft A, an
independent curreut is induced up the annular space between the casing B and the
main shaft A, and thence to the upper part of the shaft, or chimney proper.
This my improved chimney pot, when constructed consists of two main parts, and
firstly of an inside body or shaft A formed either of metal, or other suitable material
capable of being used in the construction of chimney pots, and having at its base a
flange A' by which it can be readily attached to the brickwork of the chimney or
like structure.
Secondly of an outer casing B, provided at its top with a basin shaped head B',
the sides of which head incline outwards at an angle preferably of about 35° with
the vertical; the effect of this head being to reflect, or strike upwards instead of
down the chimney, any current of air that may strike the chimney at an equally
great angle with the horizontal. The bottom B2 of the casing B is shaped like an
inverted tray so as to more readily induce an up-current of air between the shaft A
and casing B.
The shaft A and casing B are connected to each other by means of three or more
metal strips C and C¹ placed respectively at the top and bottom, and in between the
shaft A and casing B, and rivetted to them, as shewn in drawing, thus uniting them
together, but leaving between them, at the same time, a long annular space all
round, and for the full length, which space is preferably rather larger at the bottom,
& gradually decreases towards the top, as shewn.
If desired, I may construct the entire pot of earthenware, or similar material, and
in that case, the outer casing B is supported by means of suitable lugs, or projections
formed on the shaft A.
By the use of the two parts A and B already described, the casing B coming to
within a few inches-preferably about nine inches-of the base of the shaft A, an
independent curreut is induced up the annular space between the casing B and the
main shaft A, and thence to the upper part of the shaft, or chimney proper.

page_text: In addition to this, the casing B protects the shaft A from the action of cold
winds and rain, thus stimulating its up current and any rain which may be caught
by the basin shaped top B₁ of the casing B simply passes down the inside of the
casing B, but outside the shaft A.
It will be readily understood that I may construct the outer casing B separately
and apply it in any suitable way to pots shafts, or like structures of ordinary
construction, as at present in use.
It is also obvious that the shaft A, and the outer casing B, with its basin top B¹
may be constructed with a rectangular or polygonal section, as well as circular, the
principle applying equally to any of these forms, but the combination of the
circular with the rectangular sections as shewn in drawing being the most
suitable.
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 :-
:-
(1.) An improved chimney-pot, consisting of the shaft A in combination with an
outer casing B, which casing B has a basin, or inverted cone shaped top, and a
tray-shaped bottom; the said outer casing B being placed outside the shaft A, and
in such a manner that its basin, or inverted cone-shaped top, stands above the top
of the shaft A, and with its tray shaped bottom approaching to within a few inches
of the bottom of the same and before mentioned shaft A; the shaft A and casing B
being suitably connected, as shewn in drawing.
(2.) The combination of the shaft A and the outer casing B, and so arranged
that a long annular space is left all round between the two parts, and producing an
up-current of air, as described.
(3.) The combination of the shaft A, and the outer casing B, and so arranged,
as described that the outer casing B which encircles the shaft A protects it from
cold winds, rain and the like, and further assists in keeping the temperature of the
air, and smoke passing up the shaft A, as high as possible, and higher than if
unprotected.
(4.) The outer casing B herein before described and adapted to be applied to
chimney-pots and the like of ordinary construction, and at present in use, and for
the purposes set forth.
(5.) An improved chimney pot herein before described, consisting of the shaft A,
and outer casing B, with its basin shaped top, and tray shaped bottom, and made
with a circular, rectangular or polygonal section, or a combination of circular,
rectangular and polygonal sections, substantially as, and for the purposes herein
before set forth.
Dated this Seventeenth day of September 1894.