Improvements in Chimney Cowls and Ventilators.
Year: 1897

page_text: Date of Application, 20th Aug., 1997
Complete Specification Left, 19th May, 1898-Accepted, 25th June, 1898
Date of Application, 20th Aug., 1097
Complete Specification Left, 19th May, 1898-Accepted, 25th June,
1898
Improvements in Chimney Cowls and Ventilators.
I, WILLIAM MITCHELL, of Albert Works, Waterfoot, near Manchester, in the
County of Lancaster, Manufacturer, do hereby declare the nature of this inven-
tion to be as follows:-
This invention relates to means for improving the upward draft of chimneys
and ventilators and for preventing the possibility of down draft, and especially
to revolving cowls to be applied to the top of chimneys and ventilating pipes or
tubes.
The invention consists principally in applying to or near the upper end of
the tube to which the cowl is fitted, an annular trough filled with a suitable
liquid which will not freeze or evaporate (say a mixture of water and glycerine)
and in so mounting the revolving cowl on the tube that the lower end thereof
dips into this liquid and a fluid lute or air-tight joint is thus formed between
the cowl and the tube.
The cowl is provided with an annular cover for this joint to prevent the liquid
from being blown out of the trough and to prevent dirt and dust from settling
in the latter.
The top of the cowl is cranked or bent to one side (say in the form of an
elbow) and, extending from the back towards the outlet of this elbow or top
of the cowl, is formed an open ended air passage.
The cowl will be turned by the wind with its open end away from the current,
but air will pass through the air passage and create a vacuum in the cowl and
thus draw up the smoke which will be assisted in its exit from the said cowl.
The cowl may also be contracted in diameter or area before being cranked
or bent as above described.
The cowl is carried by a suitable spindle the lower part of which is supported
in an oil cup or tube, the upper end of which is suitably packed, the lower end
forming a footstep for the spindle.
The oil cup is removably fixed by suitable legs or other parts to the tube on
which the cowl is fitted and the whole apparatus can thus be easily removed
for cleaning the chimney or tube when desired.
101
1 At 1807
Improvements in Chimney Cowls and Ventilators.
I, WILLIAM MITCHELL, of Albert Works, Waterfoot, near Manchester, in the
County of Lancaster, Manufacturer, do hereby declare the nature of this inven-
CD27

page_text: tion and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement:―
This invention relates to means for improving the upward draft of chimneys
and ventilators, and for preventing the possibility of down draught or of rain or
damp entering the chimney pot or ventilator, and is especially applicable to
revolving cowls to be applied to the top of chimneys and ventilating pipes or
tubes.
The invention will be readily understood from the following description on
reference to the accompanying drawings.
Fig. 1 is a longitudinal section, and Fig. 1* a face view of a chimney cowl
made according to this invention.
Fig. 2 is a longitudinal section of the lower part or tube on which the said
cowl fits.
Fig. 3 shews the cowl fitted on the top of the tube, the form of this cowl being
however somewhat modified, and Fig. 3 shows a front view of the outlet of this
form of cowl.
The invention consists principally in applying to or near the upper end of
the tube a (see Fig. 2) to which the cowl 6 (see Fig. 1) is fitted, an annular
trough containing a suitable liquid which will not readily freeze or evaporate
(say a mixture of water and glycerine) and in so mounting the revolving cowl
on the tube a that the lower end 6* thereof dips into this liquid as seen at Fig. 3,
and a fluid lute or air-tight and weather tight joint is thus formed between the
cowl and the tube.
The cowl is provided with an annular cover d for this joint to prevent the
liquid from being blown out of the trough c and to prevent. dirt and dust
from settling in the latter, and to prevent rain or damp from entering the
chimney.
The top of the cowl is cranked or bent to one side say in the form of an
elbow as seen at Figs. and 3*, or is made with an outlet 611 at one side as
seen at Fig. 1 and 1*; and extending from the back or nearly to the outlet of this
elbow or top of the cowl; is formed an open ended air passage e.
The cowl b will be turned by the wind with its open end 6 or away from
the current, and I prefer the construction shews at Fig. 1 as the vane 6 will
present a much smaller surface to the wind and will therefore not be so strongly
acted upon thereby as the cranked end b¹ seen at Fig. 3 which might sometimes
carry the open end round so rapidly as to turn it windwards. Air will however
in either case pass through the air passage e and create a vacuum in the cowl b
and thus draw up the smoke which will be assisted in its exit from the said cowl;
but neither rain hail nor damp can get into the chimney the top of which is thus
completely protected.
The cowl may also if desired be contracted in diameter or area before being
cranked or bent as above described.
The cowl b is carried by a suitable spindle f the lower part of which is sup-
ported in an oil cup or tube g, the upper end of which is suitably packed as seen
at g (Figs. 2 and 3) the lower end forming or supporting a footstep g³ for the
spindle f
The oil cup g may be, removably fixed by suitable legs g³ (see Figs. 1^ and 3)
in the tube a on which the cowl b is fitted, and is preferably held therein by bolts,
and the whole apparatus can thus if desired be easily removed for cleaning the
chimney or tube b when desired. If however it is preferred, the legs or bridge-
pieces can be fixed in the tube, and will not form an objectionable obstruction
to the sweepers brush, especially if they are inclined as shewn at
Figs. 1 and 3.
It will be evident without further illustration that this invention can be
applied to the tops of ventilating shafts as well as to the tops of chimneys.

page_text: 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:
1
1. An improved top for chimneys or ventilator shafts consisting of the com-
bination of a tube at the upper end of which is an annular trough containing
a suitable fluid, with a revolving cowl so formed and supported that the lower
end thereof dips into the said fluid, thus forming an air tight joint between the
cowl or top and the tube, the said joint being protected by an annular cover on the
cowl substantially as herein before described.
2. The improvements in chimney cowls and ventilators combined and arranged
substantially as hereinbefore described and illustrated by the annexed drawings.
Dated this 18th day of May 1898.
GEO. DAVIES & SON,
Agents for the Applicant, 4, St. Ann's Square, Manchester.