Improvements in Chimney-pots and the like.
Year: 1890

page_text: Date of Application, 22nd Sept., 1890
Complete Specification Left, 18th Dec., 1890-Accepted, 24th Jan., 1891
PROVISIONAL SPECIFICATION.
Improvements in Chimney-pots and the like.
I, FREDERICK JAMES ORWIN, of Chudleigh, Sutton, in the County of Surrey,
formerly a Schoolmaster, but now of no occupation, do hereby declare the nature of
this invention to be as follows:-
Down draught in chimneys being generally caused by the action of a high wind,
which, striking on the inner surface of the chimney or pot, is deflected downwards,
I have designed a pot the upper part of which by its construction causes the wind to
be diverted upwards, instead of allowing it to descend the chimney.
To attain this object I fit the top of the chimney pot with a section of an inverted
cone, the sides of which incline outwards at an angle of not less than 33 degrees with
the vertical. United to the lower circumference of this cone-section, and of about the
same depth, is another cone-section-not inverted-the two together forming a sort
of dice-box (B), and referred to as such hereafter. The diameter of this at its neck
is a little greater than that of the top of the chimney pot proper (A), one effect of
which is to enable any rain caught by the sides of the upper half of the dice-box to
pass away outside the pot.
The dice-box is fixed to the top of the chimney pot by means of four iron straps (C),
three-eighths of an inch wide, riveted at equal distances apart to the inner surface
of the dice-box and the outer surface of the pot, and in such a position that the neck
of the former is above the level of the top of the pot by an inch, thus affording the
pot greater protection from any prevalent high wind.
The pot or shaft itself (A) is square at the base, with a 3 inch flange on each side
to secure it to the brickwork of the chimney. It becomes, however, round in the
course of its length, and its diameter at the top is somewhat less than the length of
any one of its sides at the bottom.
The normal dimensions of all the parts (which may be slightly varied in particular
cases) are as follows:
Diameter of dice-box at top
Ditto
Ditto
ditto
neck
"
"
ditto lowest part
Vertical height of ditto
Ditto
Ditto
of shaft
-
ditto with dice box
14 inches.
11
"
"
11 "
4 feet.
41
دو
The pot is 9 inches square at the bottom, becomes round, and finishes with a
diameter of 7 inches at the top.
The results obtained by the special structure of the "Dice-Box Chimney Pot" are
twofold:
I. The up-current of the smoke, already quickened by the gradual contraction of
the internal dimensions of the pot, is further assisted, as it emerges into the outer air,
by the external draught set up between the lower portion of the dice-box and the
outer surface of the pot.
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11. By the operation of the well-known physical law "that the angle of reflection
is equal to the angle of incidence a current of wind striking the inner surface of
the upper balf of the dice box at any angle between the horizontal and 33 degrees
with it (that is, practically, any wind that blows) is deflected outwards, and so

page_text: COMPLETE SPECIFICATION.
Improvements in Chimney-pots and the like.
I, FREDERICK JAMES ORWIN, of Chudleigh, Sutton, in the County of Surrey,
formerly a School Master, but now of no occupation, do hereby declare the nature of
this invention to be as follows:-
:-
This my said invention relates to certain new and useful improvements in chimney
pots, and the like, and my invention has for its object the prevention of down-draught
in chimneys, shafts, and like structures. The said down-draught being generally pro-
duced by the action of a high wind, or similar cause, which, striking upon the inner
surface of the chimney or pot, is deflected downwards. And also this my said inven-
tion has the further object of assisting and accelerating an up-draught in chimneys,
shafts, and like structures, to which it may be attached.
By the use of this my improved chimney pot, fires in grates, stoves, and the like,
are readily and quickly drawn up, and the "simoking" of same due to down-draught
is entirely obviated.
I now proceed to describe my said invention, reference heing had to the accom-
panying drawings, and to the letters and figures of reference marked thereon, similar
letters indicating like parts throughout.
Fig. 1 is a section of my improved chimney pot, constructed of metal throughout.
Fig. 2 is an outside elevation of the same.
Fig. 3 is a plan thereof.
Fig. 4 shows a section of my improved pot, with the body or shaft of the pot con-
structed of earthenware, or similar material, and also showing an alternative method
of attaching the metal top.
Fig. 5 is an elevation, of the same pot with the metal top shown in section.
Fig. 6 is a sectional plan of same taken on the line X X.
Fig. 7 is a part sectional elevation of my improved pot entirely constructed of
earthenware, or similar material.
Fig. 8 is a sectional plan thereof taken on the line Y Y.
This my improved chimney pot when constructed consists of two main parts, and,
firstly, of a body or shaft A, formed either of metal, as shown by Figs. 1, 2, and 3; or
of earthenware, or like material, as shown by Figs. 4, 5, 6, 7, and 8; and having at
its base a flange A¹, by which it can be readily attached to the brickwork of the
chimney, or like structure. Secondly, to the top part of said body, or shaft A, I
attach, by suitable methods hereinafter fully described, the second main part, and this
is the special feature of my invention. This is a section of a conical tube, B, inverted,
placed upon, and united to another nearly similar section (not inverted) B₁. United
thus at their smaller diameters (B2) the two sections together may be said to approach
the form of a dice box, the part B2 forming the waist. The sides of the upper section
incline outwards and upwards at an angle, preferably, of 33 degrees with the vertical,
while those of the latter incline outwards and downwards, at an angle, preferably, of
27 degrees. This dice-box attachment B B¹ may be constructed either of metal, as
shown in Figs 1 to 6 inclusive, or it may be made of earthenware, or similar material,
as shown by Figs. 7 and 8.
When my improved pot is entirely constructed of metal, as shown by Figs. 1, 2,
and 3, I may secure the dice-box attachment B, B' to the body of the pot by means
of four, or any suitable number, of metal strips C riveted, or otherwise attached, to
the inner surface of the dice-box attachment B, B' and the outer surface of the pot A ;
and in such a position that the waist B2 of the dice-box attachment B, B' is a short
distance above the top of the pot A-in general from one to two inches. Further,
the waist B2 of the dice-box attachment B, B' is a little greater than the top of the
body of the pot A, by which arrangement a clear space is left between the body of
the pot A, and the lower portion of the dice-box attachment B, B', giving rise to an
up-current external to the said pot A, and materially assisting the up-draught within;
moreover provision is thus made that any rain caught by the upper portion of the
dice-box attachment B B' may pass away outside the pot.

page_text: Where I make the body A of earthenware, or similar material, and the dice-box B B¹
of metal, I may secure the latter to the former by means of two or more rings C¹, C¹,
formed of metal or other suitable material.
These said rings are made in halves, and are riveted, or otherwise suitably con-
nected at the joints (2. These rings C¹, C' are attached to the pot A by means of
the rivets or bolts C³ C³, as shown.
Upon the inner side of the rings C₁₁are formed knobs or projections C, C+,
which fit into a groove A² formed in the top of the pot A. The object of this is to
prevent the ring C₁ together with the attachment B B', to which it is riveted, from
slipping over the pot A.
When I make the pot entirely of earthenware, or similar material, as shown in
Figs. 7 and 8, the part B B¹ becomes an integral part of the body A, being
connected to it by four, or a suitable number of webs D D, as clearly shown in
Figs. 7 and 8.
It will readily be understood that the attachment B B', as described with reference
to Figs. 1 to 6, inclusive, may be constructed separately, and applied in any
suitable way to pots, shafts, or like structures of ordinary construction as at present
in use.
It is also obvious that the body of the pot A and the attachment B B' may be
constructed with a square or polygonal transverse section, (as well as circular as
shown in drawings and described herein,) the principle applying equally to any of
these forms.
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. My improved chimney pot consisting of the parts A, B, and B' arranged in
combination substantially as described, with reference to Figs. 1, 2 and 3 of the
drawings hereunto annexed.
2. My improved chimney pot consisting of the parts A, B, and B₁ arranged
in combination substantially as described, with reference to Figs. 4, 5, and 6.
3. My improved chimney pot consisting of the parts A, B, and B' arranged in
combination substantially as described, with reference to Figs. 7 and 8.
4. The attachment B, B₁ for chimney pots hereinbefore described, and adapted to
be applied to chimney pots, shafts, and the like, of ordinary construction, and at present
in use, substantially as, and for the purposes hereinbefore set forth.
5. My improved chimney pots herein before described, and consisting of the
body portion A, and attachment or upper portion B B', made with a square or
polygonal transverse section, substantially as and for the purposes hereinbefore
set forth.
Dated this 18th day of December 1890.