Improvements in Cowls.
Year: 1894

page_text: Date of Application, 24th Jan., 1894
Complete Specification Left, 29th Jan., 1894-Accepted, 10th Mar., 1894
PROVISIONAL SPECIFICATION.
Improvements in Cowls.
1, CARL WILHELM JOHANN MARTENS, of Lübeckerthor 17, Hamburg,
Germany, Mechanic, do hereby declare the nature of this invention to be as
follows:-
This invention relates to an improved construction of cowl adapted for use as a
cover or top for a chimney, funnel, ventilation or other air outlet pipe. The object
of the invention is to so construct a cowl that the action of wind upon it is
rendered usetul under all circumstances for the abstraction of smoke, air, or the
like from the pipe or passage to which the cowl is applied, it being immaterial at
what angle or from what direction the wind strikes the head of the cowl, and
further that the wind will be conducted through the head in such a manner that
its energy is used in a very effective manner. For this purpose the cowl is con-
structed in-such-a-way that the wind entering the openings in the same is not
allowed to glance off again but is caused to pass through the head of the cowl.
In the accompanying drawings,
Fig. 1 is an elevation of a cowl constructed according to this invention; and
Fig. 2 is a plan thereof.
Figs. 3 and 4 are vertical sections on the lines x and y y respectively of
Fig. 2; and
Fig.
5 is a horizontal section on the line z 2 of Fig. 1.
a is the outlet-pipe around the upper end of which is arranged a double
cone 6 6 which is joined at the bottom to the pipe a, and at the top leaves a gap
between itself and the mouth of the pipe. Four partitions 62 divide the space
between band a into four equal compartments; and for each of these
compartments there is an opening c in the cone 66' the opening being covered by
a cap c¹.
The wind that enters these compartments through the openings c is directed
upward by the caps c and is prevented by the wall of the double coue from
escaping downwards or sideways. The wind thus directed escapes upward through.
the gap and thereby draws or induces air to flow out of the pipe a.
Over the mouth of the outlet pipe a there is a plate e and at a fixed distance
from this plate and over the same there is an annular conical cap d. These parts
serve to prevent rain entering the pipe a; they also serve to lead away through
the head, gusts of wind that enter either from above or sideways in the direction
of the arrows (Fig. 3) in such a manner that these gusts always have a sucking
or inducing action on the air in the pipe a.
Dated this 24th day of Ionuery 1801
COMPLETE SPECIFICATION.
Improvements in Cowls.
I, CARL WILHELM JOHANN MARTENS, of Lübeckerthor 17, Hamburg,
Germany, Mechanic, do hereby declare the nature of this invention and in what
manner the same is to be performed to be particularly described and ascertained
5 in and by the following statement :―
This invention relates to an improved construction of cowl adapted for use as a

page_text: cover or top for a chimney, funnel, ventilation or other air outlet pipe. The
object of the invention is to so construct a cowl that the action of wind upon it is
rendered useful under all circumstances for the abstraction of smoke, air, or the
like from the pipe or passage to which the cowl is applied, it being immaterial at
what angle or from what direction the wind strikes the head of the cowl, and
further that the wind will be conducted through the head in such a manner that
its energy is used in a very effective manner. For this purpose the cowl is con-
structed in such a way that the wind entering the openings in the same is not
allowed to glance off again but is caused to pass through the head of the cowl.
In the drawings filed with my Provisional Specification,
Fig. 1 is an elevation of a cowl constructed according to this invention; and
Fig. 2 is a plan thereof.
Figs. 3 and are vertical sections on the lines x x and y y respectively of
Fig. 2; aud
Fig. 5 is a horizontal section on the line zz of Fig. 1.
a is the outlet-pipe around the upper end of which is arranged a double cone bb'
which is joined at the bottom to the pipe a, and at the top leaves a gap between
itself and the mouth of the pipe. Four partitions 2 divide the space between b¹
and a into four equal compartments; and for each of these compartments there
is an opening in the cone 6 6¹ the opening being covered by a cap c'.
C
The wind that enters these compartments through the openings c is directed
upward by the caps c¹ and is prevented by the wall of the double cone from
escaping downwards or sideways. The wind thus directed escapes upward through
the gap and thereby draws or induces air to flow out of the pipe a.
Over the mouth of the outlet-pipe a there is a plate e and at a fixed distance
from this plate and over the same there is an annular conical cap d. These parts
serve to prevent rain entering the pipe a; they also serve to lead away through
the head, gusts of wind that enter either from above or sideways in the direction
of the arrows (Fig. 3) in such a manner that these gusts always have a sucking or
inducing action on the air in the pipe a.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that
what I claim is :-
The improved cowl comprising the outlet pipe a, the double-cone which at
its lower end fits tightly around the said pipe and at its upper end leaves a gap i
between itself and the said pipe, and which is formed with openings c, having
caps c', a cover-plate e arranged above the mouth of the said outlet-pipe, and a
conical cap d arranged to cover the opening between the upper portion of the said
double-cone and the cover-plate substantially as described and shown, for the
purpose specified.
Dated this 29th day of January 1894.