Improvements in Tops or Guards of Chimneys and Ventilating Shafts.
Year: 1893

page_text: Date of Application, 17th Jan., 1893
Complete Specification Left, 16th Oct., 1893-Accepted, 18th Nov., 1893
PROVISIONAL SPECIFICATION.
Improvements in Tops or Guards of Chimneys and Ventilating
Shafts.
We, JAMES DUDLEY NOWELL SHERSON, of 20, The Avenue, Castle Hill,
Ealing, in the County of Middlesex, Merchant's Clerk, and HENRY CRISP, of
45, Wirtemburg Street, Clapham, London, in the County of Surrey, Foreman
Zineworker, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in the tops or guards of chimneys and
ventilating shafts.
In carrying the invention into effect, the top is circular in plan and preferably
closed; and ports or openings for the escape of the smoke or air-current, as the
case may be, are made in the side. These openings are equidistant from each other.
As to number, there may be four or four groups of them.
An external guard is provided of a sufficient size to cover half of the openings
at a time. This guard is carried outside the top by an arm which is pivotted in or
upon the said top, preferably, by means of a hard metal pin revolving in an oil
cup. The arm is continued past the pivot and is extended into a vane which serves
also as a counterpoise to the external guard. Seeing that this is vertical and
concentric with the chimney top and also that the pivot of the arm is coincident
with the axis of the top, any wind current will hold the guard between it and the
openings in the top on that side of the latter.
Dated this 17th day of January 1893.
PHILLIPS & LEIGTI,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Tops or Guards of Chimneys and Ventilating
Shafts.
We, JAMES DUDLEY NOWELL SHERSON, of 20, The Avenue, Castle Hill,
Ealing, in the County of Middlesex, Merchant's Clerk, and HENRY CRISP, of
45, Wirtemburg Street, Clapham, London, in the County of Surrey, Foreman
Zincworker, 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 :-
This invention relates to improvements in the tops or guards of chimneys and
ventilating shafts.
In carrying it into effect, we make the top circular in plan and preferably closed,
and ports or openings for the escape of the smoke or air-current, as the case may
be, are made in the side. These openings are equidistant from each other.
number, there may be four or four groups of thein.
As to
An external guard is provided of a sufficient size to cover half of the openings
at a time. This guard is carried outside the top by an arm which is pivotted in or
upon the said top, preferably, by means of a hard metal pin revolving in an oil cup.
The arm is continued past the pivot and is extended into a vane which serves also
as a counterpoise to the external guard. Seeing that this latter is vertical and
concentric with the chimney top and also that the pivot of the arm is coincident
with the axis of the top, any wind current will hold the guard between it and the
openings in the top on the windward side of the latter.
In order that our invention and the best means of carrying it into practical

page_text: effect may be thoroughly understood, we will now describe it and them in detail,
referring in so doing to the accompanying drawings which are to be taken as
part of this Specification and read therewith. They illustrate the application of
the invention to a terminal pipe with the well known tapered and flanged rectangular
bottom.
Fig. 1 is a sectional side elevation.
Fig. 2 is a side elevation looking at the top in the direction indicated by the
feathered arrow in Figure 4.
Fig. 3 is a horizontal section through the improved top.
Fig. 4 is a plan.
c is the top.
d, d are four
a is the terminal pipe of the chimney or ventilating shaft, as the case may be.
is the tapered and flanged rectangular bottom referred to above.
It is circular in plan and is fixed concentrically upon the pipe a.
draught ports, and e, e, as many intervening closed portions of top. The width of
a portion e is about one third that of a port. The ports are of equal size, uniform
in shape and disposed symmetrically about the axis of the top. The number and
shape of the ports as well as their grouping (the latter to some extent only) may
be varied, but we find that four equi-distant and equal sized ports symmetrically
arranged with that number of intervening closed portions of the relative width
specified, give the best results, because then the vertical edges of the guard
combine with two of the said closed portions to prevent the entrance of cross
currents into the top c. The latter is closed above by a double cone f, within
which the oil tube g with its step bearing is enclosed, being thereby shut off from
the access of smoke and the accumulation of soot.
is the port guard. It is a vertical plate, wider than the depth of the top c
rather than only as wide, bent concentrically with the sides of the top but on a
longer radius, and in point of arcual length, it embraces as many degrees as are
comprised between the outside edges of two adjacent ports d. This latter relation-
ship, in respect of dimension, is clearly illustrated in Figure 3 which further shews
that when the guard covers the said two ports symmetrically, it, in conjunction
with the two closed portions e, e next to its side edges, holds more than half of the
circumference of the top closed to the wind.
jis an arm to which the guard is fixed. This arm is carried upwards and over
the tube g at a short distance above it, at least far enough to keep clear of it and
to carry a tube guard k, where it and the vane 7 are connected, the vane standing in
the vertical plane and counterpoising both guard and arm upon a cone pointed
centre pin m depending from them. This enters the tube and stands in the step
bearing. The guard i, arm j, vane 1, pin m and tubeguard & may be made fast
together in any suitable way and any finial n be added.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manuer the same is to be performed, we declare that what we
claim is
1. The combination of fixed top having ports symmetrically arranged in its side
and a balanced vane and guard adapted to close the windward ports under the
action of the wind, as set forth.
2. The combination of fixed top having ports symmetrically arranged in its side,
a balanced vane and guard adapted to close the windward ports under the action of
the wind and a double closing cone adapted to receive and support the spindle
and oil tube, as set forth.
1
1000
PHILLIPS & LEIGH,
22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicants.