Improvements in Chimney Pots, Cowls, and the like for Preventing Down-draughts.
Year: 1899

page_text: Date of Application, 17th May, 1899
Complete Specification Left, 24th June, 1899-Accepted, 29th July, 1899
PROVISIONAL SPECIFICATION.
Improvements in Chimney Pots, Cowls, and the like for Preventing
Down-draughts.
I, JOHN GRINHAFF, of Station Street, Swadlincote, in the County of Derby,
Pottery Manufacturer, do hereby declare the nature of this invention to be
as follows:-
The object of my invention is to provide a simple and effective means of
preventing down draughts in chimneys, air shafts and the like, my invention
being chiefly applicable to house chimneys although as already indicated it
may be applied to air and ventilating shafts.
In carrying out my invention I construct a pot of any usual shape without
side louvres or openings and over this arrange a dome, mushroom or other
suitably shaped cover the diameter of which is considerably larger than that of
the top of the chimney so that any downward current of air is prevented entering
the top of the chimney, the cover is carried by brackets or the like on the top
of the ordinary part of the pot and a suitable space is left vertically between the
top of the ordinary part of the pot and the underside of the said cover to allow for
the exit of smoke or the like.
Although I have herein described the cover as being dome or mushroom shaped
it will be understood that I may vary this shape without departing from the spirit
of my invention for instance I might if found desirable make it of a conical
shape.
thin 10
love of 1800
W. SWINDELL,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Chimney Pots, Cowls, and the like for Preventing
Down-draughts.
I, JOHN GRINHAFF, of Station Street, Swadlincote, in the County of Derby,
Pottery Manufacturer, 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:-
The object of my invention is to provide a simple and effective means of
preventing down draughts in chimneys, air shafts and the like, my invention
being chiefly applicable to house chimneys although as already indicated it
may be applied to air and ventilating shafts.

page_text: In describing my invention reference will be had to the accompanying sheet of
drawings upon which Figure 1 is a vertical section upon line a, a of Figure 2;
and Figure 2 is a plan on line b, b of Figure 1.
In carrying out my invention I construct a pot A of any usual shape without
side louvres or openings and over this arrange a dome, mushroom or other
suitably shaped cover B the diameter of which is considerably larger than that
of the top A¹ of the lower part of the pot A so that any downward current of air
is prevented entering the top of the chimney, the cover is carried by brackets C
or the like on the top of the ordinary part of the pot and a suitable space ])
is left vertically between the top A' of the ordinary part A of the pot and the
underside B of the said cover to allow for the exit of smoke or the like.
Although I have herein described the cover as being dome or mushroom shaped
it will be understood that I may vary this shape without departing from the spirit
of my invention for instance I might if found desirable make it of a conical
shape it will also be evident that the proportion of space D) as well as the
proportion and design of the different parts may be varied to suit individual
requirements.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
The improved chimney pot, cowl or the like for preventing down-draughts
having a mushroom or other suitably shaped cover supported on brackets or
the like above the plain part of the pot and a space or spaces between the two
substantially as described and illustrated:
-
ين
1
P
1200
W. SWINDELL,
Imperial Chambers, Albert Street, Derby,
Agent for the Applicant.
W. SWINDELL,
Imperial Chambers, Albert Street, Derby,
Agent for the Applicant.