An Improvement in Chimney-tops.
Year: 1890

page_text: Date of Application, 13th Sept:, 1890-Accepted, 18th Oct., 1890
COMPLETE SPECIFICATION.
An Improvement in Chimney-tops.
We KENNETH MCKENZIE, of 38 Frederick Street, Edinburgh, in the County of
Midlothian, North Britain, Slater, and GILBERT ROBERT ANDERSON, of 33 Howard
Place, Edinburgh aforesaid, Ironfounder, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
Our invention, which relates to an improvement in chimney tops, has for its object
the constructing of such chimney tops so as to prevent back-smoke, back-draughts or
blow-downs.
Our invention consists of a flue made of metal, fireclay, or other suitable materiai,
which is made narrower at the bottom than at the top. Inside of this flue there is
fixed a small pipe or tube, the lower end of which fits into a hole in the underside of
the flue. Fitting into this pipe or tube at its upper end there is another pipe having
a bell-shaped mouth. This latter pipe is supported by means of three or
arms, resting on flanges which are provided inside the flue. The upper end of
the flue has a tapering cover placed over it. This cover may rest on flanges fixed
inside the flue, and it has a hole or opening in its centre.
more
In order that our invention may be properly understood and readily carried into
effect, we have hereunto appended two explanatory sheets of drawings in the
several figures of which corresponding parts are marked with the same letters of
reference.
Figure 1 is an elevation of our improvements.
Figure 2 is a plan.
Figure 3 is a section of Figure 1.
Figure 4 is also a plan, but with the top or cover off.
A is the flue; B the small inside pipe or tube which fits into the hole C of
the flue; D is the other pipe with the bell-shaped mouth, the lower end of which
fits into the pipe B at E. This pipe 1 is supported by means of the wings e, e, e,
resting on flanges f. F is the tapering cover which is placed on the upper end
of the flue A, and rests on flanges 9; and G is the hole or opening in the centre
of it. From the top of this cover F to the mouth of the pipe D is preferably about
four inches, but it may be a little less or more, and the diameter of the hole G in the
cover F is preferably about three quarters of an inch less than the diameter of the
bell-shaped mouth H of the pipe D.
The whole constituting the chimney top is placed on the top of the chimney, the
narrower end of the flue fitting into the built-in portion of the chimney, or into
a chimney-can. When the smoke reaches the chimney top it passes into the flue A,
and round the outside of the bell-shaped mouth H of the pipe D, and out by the hole
or opening G in the cover F. When, however, there is a strong breeze blowing by
which the smoke cannot escape by the opening H, in place of returning from
whence it came, it is driven down the pipe D into the pipe B and out by the
hole C, the diameter of the bell-shaped mouth H of the pipe D being greater than
the opening G of the cover F.
When it is desired to sweep the chimney, the cover F, which may be provided
with a suitable handle I, and the pipe D are removed, when there is direct
communication with the top and bottom of the chimney.
It is to be understood that although we have described and shown two pipes D
and B, inside the flue, one only may be used.

page_text: 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 :-
The improved chimney top, fitted with pipes B and D, or one pipe equivalent thereto,
and cover F substantially as described and shown on the annexed sheets of
drawings.
.
Dated this 12th day of September 1890.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicants' Agents.