Year: 1897

page_text: WILLIAM ROBERT DRUMMOND Harlaxton House Alexandra Park Scarborough
Schoolmaster do hereby declare the nature of this invention to be as follows:-
This chimney pot (or chimney top) is designed to prevent
6
down-draught" in
the flue on which it is placed and may be made of any suitable material.
The smoke escapes through openings in the sides of the pot. The openings are
provided with shutters which are so hung that the windward side is closed whilst
the lee side is correspondingly opened.
Any suitable hinge may be used on which to hang the shutters.
I, WILLIAM ROBERT DRUMMOND of Harlaxton House, Alexandra park, Scar-
borough in the County of York, Schoolmaster, 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 that class of chimney pots, designed
to prevent down-draughts, wherein apertures for the emission of smoke and heated
air are formed at the sides, and are provided with pendent shutters, which open at
one side of the pot, and automatically close at the opposite side, according to the
direction of the wind.
In order to enable this invention to be fully understood, I will proceed to
describe the same with reference to the accompanying drawings, in which:
Figure 1 represents a sectional elevation of a chimney-pot with hanging
shutters, constructed according to my invention.
Figure 2 represents an external elevation of the same.
Figure 3 represents a plan view of the same, the cap H being removed.
Figure 4 represents a sectional plan of the chimney pot at the line xx, the
shutters being omitted.
Similar letters refer to similar parts in each figure.
The arrow indicates the direction of the wind.
In the accompanying drawing, the body or shaft of the chimney pot is repre-
sented as being made in earthenware, but galvanized iron is an equally suitable
material.
The body or shaft above referred to is represented at A A the princinal

page_text: which the shutters are applied being by preference hexagonal in plan, and at
each angle of the hexagon a strengthening bar or vertical flange B B is formed,
which flange may be extended or broadened as shown in the plan Figure 4, to
form a screen or windguard protecting the smoke exits towards the leeward side of
the pot.
The horizontal partition J closes the top of the smoke-shaft, and prevents the
brush employed in sweeping the chimney from coming in contact with the work-
ing parts of the shutters or their extensions.
Between the bars BB are flat panels, in which are formed rectangular_aper-
tures for the outlet of smoke, and each outlet is provided with a hanging shutter
cr valve CU, which is actuated by means of the wind, the shutters on the wind-
ward side of the pot being thereby closed, while those upon the leeward side are
simultaneously opened automatically, and in the manner hereinafter described.
The top of each shutter is extended upward and inward or has riveted thereto
a malleable iron tongue or angular extension DD, which also acts as a hinge
having projecting pins fitting into grooves EE, formed in the upper part of the
bars BB, and at the inner angle of the extension or tongue is rivetted the
stud FF. Each of the six tongues or extensions being supplied with a stud F,
the plain iron ring G is placed over the studs while three of the shutters at one
side of the pot are slightly opened.
The force of the wind closing the shutters on one side of the pot, and thereby
operating upon the ring G, applies tension to the studs of the shutters at the other
side, slightly opening them, for the exit of smoke on the leeward side of the pot.
Instead of the studs FF before referred to, as being connected by means of the
ring G, the studs may be omitted, and a smaller ring be employed, to which the
tongues or extensions DD may be connected by means of links, or wire hooks, in
which modified form, the operation will be similar to that in which the form
shown in the drawing is employed.
In a calm atmosphere every shutter is slightly open.
The cap H covers the working parts from snow, and protects them from the
weather generally.
To prevent noise being caused by the sudden or forcible closing of the shutters,
slightly projecting pads or buffers K are provided, which are inserted in recesses,
formed in the panels of the chimney pot, and are made of asbestos, felt, or other
suitable material.
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:-
1. A chimney pot or top, provided with hanging shutters, which shutters have
tongues or upward extensions with studs, hooks, or wires actuating a ring, which
connects all the shutters, opening those which are upon the opposite side of the
chimney pot, to those which are closed by the pressure of the wind, all the various
parts being formed, arranged, combined, and operating in the manner described
and as represented.,
2. A chimney pot having self closing and opening shutters, in which none of
the operating mechanism is within the shaft of the pot, to interfere with the
passage of a brush in sweeping, all substantially as described and represented.
Dated this 20th day of October 1897.
WILLIAM J. BAKER
Peasholme House Scarborough, Agent for the Applicant.