Improvements in Tops or Guards of Chimneys and Ventilating Shafts.
Year: 1892

page_text: Date of Application, 12th Dec., 1892
Complete Specification Left, 12th Sept., 1893-Accepted, 14th Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in Tops or Guards of Chimneys and Ventilating
Shafts.
We, JAMES ARTHUR GOODMAN, of No. 11, and FREDRICK ROBERT STONE,
of No. 13, Marco Road, Hammersmith, in the County of Middlesex, Clerks, do
hereby declare the nature of this invention to be as follows:-
Our invention relates to improvements in the construction of tops or guards for
chimneys. Tops or guards made according to it are also applicable for cognate
reasons, to ventilating shafts.
In carrying our invention into effect we fix a double cone, i.e., a pair of hollow
cones set base to base, upon the top of the chimney or of a terminal pipe adapted
to be built on to it, or upon the top of the ventilating shaft by joining it airtight
thereto.
A second double cone of a similar contour is supported at a short distance above
the one last mentioned. The respective diameters of the free edges of the two
double cones increase, that of the top of the first cone being the smallest and that
of the top of the uppermost cone being the longest.
.
An inverted cone is supported above all the cones.
The last and the two double
cones are held together by suitable vertical webs or rods, thereby providing for the
passage between them of cross currents of wind, the force of which is condensed or
concentrated in a plane just above the delivery openings of the double cones.
Dated this 12th day of December 1892.
PHILLIPS & LEIGH,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Tops or Guards of Chimneys and Ventilating
Shafts.
We, JAMES ARTHUR GOODMAN of 11, and FREDRICK ROBERT STONE
of 13, Marco Road, Hammersmith, in the County of Middlesex, Clerks, 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:-
Our invention relates to improvements in the construction of tops or guards for
chimneys. Tops or guards made according to it are also applicable, for cognate
reasons, to ventilating shafts.
In carrying our invention into effect, we fix a double cone, i.e., a pair of hollow
cones set base to base, upon the top of the chimney, or of a terminal pipe adapted
to be built on to it, or upon the top of the ventilating shaft, by joining it air tight
thereto.
A second double cone, of a similar contour, is supported at a short distance above
the one last mentioned. The respective diameters of the free edges of the two
double cones increase, that of the top of the first cone being the smaller and that of
the top of the uppermost cone being the larger.
An inverted cone is supported above all the cones. The latter and the two
double cones are held together by suitable vertical webs or rods, thereby providing.
for the passage between them of cross currents of wind, the strength of which is
condensed or concentrated in a plane just above the delivery openings of the double
cones.

page_text: may be thoroughly understood, we will now describe it and them in detail, referring
in so doing to the accompanying figures which are to be taken as part of this
Specification and read therewith.
Fig. 1 is a sectional elevation of a sheet metal chimney top taken on the line 1-1
of Figure 2.
Fig. 2 is a sectional plan taken on the line 2-2 of Figures 1 and 3.
Fig. 3 is a side elevation.
a is the outwardly projecting flange fast on the bottom of the tapered portion a¹
on the top of which is made fast the parallel portion a² of the top. So far, the
figures follow the well known method of making sheet metal chimney tops and our
invention does not relate to the portions just mentioned. The parallel portion a
may be regarded as standing for the terminal portion of any ventilating shaft.
b is a double hollow cone consisting of two hollow cones joined along their
respective bases b. It is joined to the top of the parallel portion a² along one of
its edges.
c is a second double hollow cone consisting likewise of two hollow cones joined
along their respective bases c¹ which are, preferably, of the same diameter. The
smaller diameters ², c³ of this double cone are of different lengths, the smaller one c³
being longer than that, 63, of the double cone b.
The three diameters ³, c², c³, being those of the top openings of the bottom cone
and both openings of the top one, increase in length away from the parallel
portion a².
The object in increasing the diameters in the way described is to provide for the
passage of an upward current which may strike the top of the lower cone, upwards
through the upper cone instead of being beaten back by the lower side of the upper
cone, which it would be if the mouth of the latter cone were not larger than the top
of the lower cone.
d is a hollow inverted cone. It may have a stopping diaphragm d¹. e is an
ornamental terminal and is not an operative feature of the invention.
The cones c and d are supported axially above each other and the cone 6, and
the three made fast to each other and supported axially over the portion a, by
vertical webs e', e¹ which may be of any convenient construction. It is of importance
that the three cones b, c and d are not fixed too close together. There must be
clear ways, f, g, provided, the former between the two cones and c, and the latter
between the two c and d, to allow of the passage of cross currents of wind. The
effect of the latter upon the open end of a vertical shaft is to create a partial vacuum
and a consequent up current therein. In the case of a top constructed according
to our invention, this well known action of such cross currents is increased by the
converging faces of the double cones which have the effect of concentrating the
energy of the said currents in the said clear ways.
Our invention does not limit us to the use of only two double cones, although we
find this to be a suitable number. No matter how many double cones are used,
their smaller diameters must bear the above specified relationship in respect of
length.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:
1. The combination with a chimney top or with the terminal portion of a venti-
lating shaft, of two or more double hollow cones, the openings of which are of
different diameters increasing in length away from the top or terminal portion, and
webs or their equivalents supporting the said cones over each other and the said
top or terminal portion and holding all together, as set forth.
2. The combination with a chimney top, or with the terminal portion of a venti-
lating shaft, of two or more double hollow cones, the openings of which are of
different diameters increasing in length away from the top or terminal portion,

page_text: webs or their equivalents supporting the said cones over each other and the said
top or terminal portion and holding all together, and an inverted cone over all, as
set forth.
Dated this 12th day of September 1893.
PHILLIPS & LEIGH,
22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicants.
PHILLIPS & LEIGH,
22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicants.