Improvements in Chimney Cowls or Caps.
Year: 1898

page_text: Date of Application, 22nd Sept., 1898-Accepted, 17th Dec., 1398
COMPLETE SPECIFICATION.
Improvements in Chimney Cowls or Caps.
I, ROMAN KOWALSKI, of Nakel on the Netze, Province of Posen, Germany,
Forge Master, 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:---
Chimneys as at present constructed have the drawback that they do not allow
of a free escape for the smoke when the chimney is surrounded by higher
buildings and especially in windy weather, because the smoke is on the contrary
arrested and forced back into the chimney by the action of the wind. It is
obvious that this drawback interferes with the proper operation of the fire and
fills the apartments with smoke which greatly inconveniences for example
workmen in their workshops and hinders them in their work. The protecting
plates or cowls heretofore employed have not given the expected result because
the smoke is caused by the action of the wind to collect under said cowls and thus
prevent the column of smoke which is in the chimney from rising and escaping
into the atmosphere.
The object of the present invention consists in a chimney cowl which does away
with these drawbacks and which allows of effecting a perfect escape of the gases
of combustion. This effect is produced by a cowl the cover of which is provided
with a door in such a manner as to leave between the cover and the door an
interval of space having a downward inclination into which a current of the outer
air can enter from the top. It will be readily perceived that this current in
flowing obliquely into the interior of the cowl will obviate all concentration of
the smoke therein and that this current will rather draw away the smoke and
leave the space free to the following gases which will flow into the cowl in the
place of those gases which have already escaped into the atmosphere.
The accompanying drawings illustrate by way of example one form of con-
struction of my invention in these drawings, Figure 1 is a longitudinal section
of a chimney provided with the improved cowl. Figure 2 is a cross section taken
through the pipe. Figure 3 is a plan view of the top of the cowl.
This chimney cowl consists of a pipe a which is inserted in the shaft of the
chimney and which is attached by means of angle pieces o to a cap in such a
manner that the upper edge of the pipe will project to a certain extent beyond
the bottom of the cap or cowl proper. In the cover of the cowl there is formed
an aperture which is closed by means of a door d. This door d is arranged at a
certain height above the cover in such a manner as to leave an interval of space e
through which the outer air can enter. It will be perceived that the movement
of the air thus produced will take place in the direction of the arrows f (Figure 1),
the air will mix with the smoke which it will carry along with it in a downward
direction whereupon it will escape into the atmosphere. In order to clean the
chimney and to have ready access to the pipe it is merely necessary to open
the door 1

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:-
-
A chimney cowl characterised by a ventilating device the cover of which is
provided with a super-elevated door for the purpose of preventing, by means of
a current of air entering from the top, the concentration of the smoke inside the
cowl, substantially as above described and shown in the accompanying drawing.
Dated this 22nd day of September 1898.
ROBERT E. PHILLIPS, Assoc.M.Inst.C.E., M.I.Mech. E.,
Chartered Patent Agent,
70, Chancery Lane, London, W.C., Associate Agent.