Improvements in the Construction of Chimney Pots and Ventilating Cowls.
Year: 1897

page_text: PROVISIONAL SPECIFICATION..
Improvements in the Construction of Chimney Pots and Ventilating
Cowls.
I, JONATHAN DEARDEN ISHERWOOD, 1, Bolton Road West, Ramsbottom, in the
County of Lancaster, Plumber & Glazier, do hereby declare the nature of this
invention to be as follows:-
"
My said invention. relates to improvements in the construction of chimney pots
and ventilating cowls and has for its object to prevent. the occurrence of down
draughts......
In carrying my invention into effect I surround the upper part of a chimney pot
or the like with a concentric outer casing open at. the top and bottom. to the
atmosphere...
The chimney pot may be of any usual or ordinary construction and the outer
casing secured to it by means of lugs .or. distance pieces, leaving an annular space
between the interior of the outer casing and the chimney .pot. Within the outer
casing and a little distance above the top of chimney pot I pivot a disc to..the
casing, of a diameter. less than the interior diameter of the casing. The smoke
and other products of combustion pass out of the chimney pot. around the edges
of the pivotted disc and so out of the top of the casing... In case of down draught
the pivotted dise disposed over the top of the chimney pot acts as a baffle and
prevents the down draught from having access to the chimney pot, and the same
is discharged at the bottom of the casing into the atmosphere.
.......
By means of my invention smoky chimneys are effectually cured. As the disc
is pivotted it offers no obstruction. to.. the, sweeping of the chimney, the brush
turning the disc on its pivots and returning it to its normal position on the with-
drawal of the brush.......
...The improved chimney pot or cowl. might be made, of sheet metal or any other
suitable material...
Instead of pivotting the disc as described I might hinge it so that it could be
raised by the sweeping brush and again. fall into position on the withdrawal of
the same.
Dated this. 8th day of April 1897.
..For the Applicant,
E. K. DUTTON & Co.,
Chartered Patent Agents;
5, John Dalton Street, Manchester..

page_text: Improvements in the Construction of Chimney Pots and Ventilating
Cowls.
I, JONATHAN DEARDEN ISHERWOOD, 1, Bolton Road West, Ramsbottom, in the
County of Lancaster, Plumber & Glazier, 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 and accompanying
drawings:-
My said invention, relates to improvements in the construction of chimney pots
and ventilating cowls and has for its object to prevent the occurrence of down
draughts.
In carrying my invention into effect I surround the upper part of a chimney pot
or the like with a concentric outer casing open at the top and bottom to the
atmosphere.
The chimney pot may be of any usual or ordinary construction and the outer
casing secured to it by means of lugs or distance pieces, leaving an annular space
between the interior of the outer casing and the chimney pot. Within the outer
casing and a little distance above the top of the chimney pot I pivot a disc of a
diameter less than the interior diameter of the casing. The smoke and other
products of combustion pass out of the chimney pot around the edges of the
pivotted disc and so out of the top of the casing. In case of down draught the
pivotted disc disposed over the top of the chimney pot acts as a baffle and prevents
the down draught from having access to the interior of the chimney pot and the
draught is discharged at the bottom of the casing into the atmosphere.
My invention will be more clearly understood by referring to the annexed sheet
of illustrative drawings in which
Fig. 1 is an outside view of a chimney pot constructed in accordance with my
invention.
Fig. 2 is a view at right angles to the same and partly in section so as to show
my invention more clearly.
Fig. 3 is a plan view of Fig. 2.
Fig. 4 shows a modification of my invention and
Fig. 5 is a plan of Fig. 4.
Referring in the first place to Figs. 1 to 3 of the drawings the chimney pot or
cowl a is provided at its upper end with an outer casing 6 of larger diameter, and
which is secured to the chimney pot by means of lugs or distance pieces c.
A baffle plate or disc d about equal in diameter to the chimney pot is pivotted
in the interior of the casing and disposed a little distance above
the top of the chimney pot, as clearly shown in Fig. 2 of the
drawings. The lower side of the disc d is weighted with a suitable weight d¹
shown of a conical shape in the drawings, so as to ensure the pivotted disc maintain-
ing a horizontal position. As will be more clearly seen from an inspection of Fig. 3
the disc d being of less diameter than the interior diameter of the casing b, the
smoke issuing from the chimney pot can freely pass round the edge of the disc into
the atmosphere as shown by the arrows. In case of down-draught however the disc
acts as a baffle and effectually prevents the down draught from having access to
the interior of the chimney, and the draught is discharged at the bottom of the
casing into the atmosphere as indicated by the arrows.
By this means smoky chimneys and down draughts in ventilating cowls are
effectually cured.
The pivotted dise d offers no obstruction to the sweeping of the chimney, the

page_text: brush turning the disc on its pivots as shown in dotted lines in Fig. 1. On the
withdrawal of the brush the disc returns to its normal position being assisted in
this by the weight d' disposed below the disc.
The disc d instead of being pivotted as described might be hinged as shown in
Figs. 4 and 5. In this case the disc d is hinged at ¹ to the interior of the casing b
and is provided with fingers 2 resting upon a lug 61 formed on or secured to the
interior of the casing b as plainly shown in the Figs. In sweeping the chimney
the brush could raise the disc into a nearly vertical position as shown in dotted
lines in Fig. 4. To ensure the disc d returning to its normal position on the
withdrawal of the brush I might provide a spring or stop to prevent the disc from
being raised too high.
Although I have shown my invention applied to a chimney pot constructed of
sheet metal such as copper, zinc or the like it will be understood that the same
may be constructed of earthenware or any other suitable material.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I declare that what I
claim is:-
1) The improved construction of chimney pot and ventilating cowl substantially
as described and shown.
2) As means for preventing the access of downdraught into the interior of
chimney pots and ventilating cowls, a pivotted or hinged disc or baffle plate
disposed above the chimney pot and carried in the interior of a casing or shield
surrounding the upper part of the chimney pot in the manner and substantially
as described and illustrated.