AN IMPROVED CHIMNEY COWL OR VENTILATOR
Year: 1885

page_text: I GEORGE SMITH of 186 Kennington Park Road, Kennington in the County of
Surrey, Gas Meter Manufacturer, do hereby declare the nature of my invention for
AN IMPROVED CHIMNEY COWL OR VENTILATOR, to be as follows:-
My Improvement consists of a hollow cylinder, on the outside of which I attach
leaves of metal somewhat similar in shape to those affixed to an ordinary rotator,
at such an angle that the wind catching on the same causes it to rotate, and by
means of a fan or archimedian screw, which is attached to it exhausts the smoke
if used on a chimney or the foul air if used as a ventilator; above and over the
rotating cylinder I place an ordinary cowl head which acts independently to the
hollow cylinder, fan, and archimedian screw before mentioned and
kept in its
proper position for the ejection of the smoke, or foul air as the case may be, by
means of a vane or arrow placed on the top thereof, thus preventing any possibility
of a down draft no matter under what circumstances. The wind thereby having
no power whatever except to turn the cylinder and keep the cowl above in the
direction of the wind,
An Improved Chimney Cowl or Ventilator.
I GEORGE SMITH of 186 Kennington Park Road Kennington in the County of
Surrey, Gas Meter Manufacturer do hereby declare the nature of my invention for
A COMBINATION CHIMNEY COWL OR VENTILATOR, and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :—

page_text: forming the archimedian screw; m, m the pieces of metal by which the frame is
' attached to the rotator b¹; f is a tube attached to the frame and swivelling on the
pin e, i, is a piece of metal attached to the cylinder c, and carrying the pin e
Fig. 3 is a plan of the archimedian screw shewn in the section Fig. 2.
The above mentioned figures are all drawn to the same scale and the same letters
of reference indicate identical parts.
To perform my Invention, I employ a hollow cylinder 61, Fig. 2, working outside
the chimney-pot c, and on it I attach leaves of metal b, at such an angle that they
readily catch the wind; similar to those of an ordinary rotator, inside this cylinder
and attached thereto by means of the pieces of metal m, m, is the skeleton
frame 1, 1, carrying either an archimedian screw formed by leaves of metal as
shewn d, d, Figs. 2 and 3. or an ordinary screw, which rotating from the effects of
the wind on the outer cylinder b¹ exhausts the smoke if used as a chimney cowl or
the foul air if applied to a ventilating shaft; both the frame 1, 1, and the cylinder b¹
rotate on the pin e, by means of the tube f, and are kept in their position by the
projection on the piece of metal i.
Above and over the cylinder 61 I place an ordinary cowl head, a, lobster back or
any other form that may be deemed convenient, swivelling it in the usual manner
by means of the block k, on the apex of the pin e and kept perpendicular by the
tube f¹, and bars j, being thus pivotted, it is always kept in the proper position for
the egress of the smoke or foul air by the tail piece g, thus making a down draught
impossible, and by reason of there not being any apertures through the rotating
cylinder b¹, the smoke or foul air is drawn through the archimedian screw or fan,
and passes out of the cowl head without a check of any kind whatever.
cowl head being kept in its proper position by the wind, uids in producing an up
draught.
The
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:-
1stly The combination of a rotator without apertures attached to a screw or fan
inside the chimney pot with a separate cowl head over and above, as before described
and shewn on accompanying drawing.
+
2ndly The adaptation of the particular kind of archimedian screw before described
to chimney cowls or ventilators in general not binding myself to any particular
number of threads or leaves.
1
1000