An Improved Chimney Top.
Year: 1892

page_text: Date of Application, 14th July, 1892
Complete Specification Left, 13th Apr., 1893-Accepted, 13th May, 1893
PROVISIONAL SPECIFICATION.
An Improved Chimney Top.
JAMES BROWN 90 Commercial Road South Shields, Blacksmith, do hereby
declare the nature of this invention to be as follows:-
:-
My invention consists in an improved chimney top or pot; whereby downdraught
and smoke are automatically prevented.
It is carried out as follows:-
The chimney top or pot may be formed of any suitable material, thin metal by
preferance being employed, and may be of round, square or other shape. At a
convenient distance from its base ports or holes are formed in the sides opposite to
each other; each hole being fitted with a hinged cover or flap so connected with
the one immediately opposite to it by a pivoted connecting rod as that when the
one is closed by the force of the wind the other is opened; in this manner the
wind automatically closes and opens the outlets for the smoke thereby preventing
downdraught and smoke. The pot or top may be surmounted with a coned hood
so placed as to permit free escape of smoke and wide enough to prevent down-
draught by the entrance of cold air.
Dated Ll 14th 1000
FRANCIS M. ROGERS,
Agent.
COMPLETE SPECIFICATION.
An Improved Chimney Top.
I JAMES BROWN 99 Commercial Road South Shields Blacksmith, 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 :-
My invention consists in an improved chimney top or pot, whereby downdraught
and smoke are automatically prevented.
It is carried out as follows:-
The chimney top or pot may be formed of any suitable material, thin metal by
preferance being employed, and may be of round, square or other shape. At a
convenient distance from its base, ports or holes are formed in the sides opposite to
each other; each hole being fitted with a hinged cover or flap so connected with
the one immediately opposite to it by a pivoted connecting rod as that when the
one is closed by the force of the wind the other is opened; in this manner the wind
automatically closes and opens the outlets for the smoke thereby preventing down-
draught and smoke. The pot or top may be surmounted with a coned hood so
placed as to permit free escape of smoke, and wide enough to prevent down
draught by the entrance of cold air.
To enable my invention to be better understood I will now more particularly
describe the same by means of the accompanying drawings in which :—
Fig. 1. is a front elevation.
Fig. 2. is a vertical sectional view but having round base.
Fig. 3. is a plan looking up.
Fig. 4. is an elevation of plain coned hood.
In the drawings 1, is the chimney top or pot which may be round square or
other shape and be formed of any suitable material, thin metal such as iron,
galvanized or otherwise or zinc being by preference employed.

page_text: At a convenient distance from its base, ports or holes 2, are formed in the sides
opposite to each other, each pot or hole being fitted with a hinged cover or flap 3,
the opposite flaps are connected to each other by means of a connecting rod 4, in
the manner shewn. The top or pot may be surmounted with a plain or ventilated
coned hood 5, attached to it by strips 6, as shewn, a free space being left between
the hood and the pot for the escape of the smoke, and the hood being made
sufficiently wide to prevent down draft by entrance of cold air. The base of the
pot.may also be made of circular shape as in Fig. 2 or of any other shape suited
for mounting upon varying forms of chimneys.
The operation of my invention is as follows:-In still weather when there is no
wind the flaps or covers 3, are in the position shewn in Fig. 2.
In Fig. 1, the wind is supposed to be blowing in the direction of the long arrow,
which closes the flap to the left hand; but by means of the connecting rod 4, opens
the flap upon the side opposite to it. Down draught arising from sudden puffs is
thus automatically prevented; and free escape of the smoke (see short arrows)
provided for under all conditions.
I sometimes mount a counterbalance 7 upon each or any of the flaps (see
Figs. 2, 3,) as by this means I can the better balance them and secure a greater
degree of sensitiveness in their action.
Where a sharp draught is required I perforate the hood 5, as at 21, the
perforations being covered with curved metallic strips 5', soldered or riveted on.
In some cases the coned hood may be unperforated as shewn in Fig. 4, and formed
of plain sheet metal; or corrugated metal may be employed, the smoke escaping
through the corrugations between the points of attachment.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed; I declare that what I
claim is:-
1. The improved chimney top or pot constructed and operating in the way and
manner and for the purposes substantially as herein described.
2. The combination in or with a chimney top or pot having a plain or ventilated
hood of the opposite ports or holes 2, and the hinged covers or flaps 3, connected
in pairs by the rods 4, and operating so that when one port is automatically. closed
by the wind, that opposite to it is opened in the way and manner described."
Dated 13th April 1893.
FRANCIS M. ROGERS,
Agent.