Improvements in or relating to Chimney Tops.
Year: 1889

page_text: Date of Application, 20th Feb., 1889
Complete Specification Left. 13th Nov., 1889-Accepted, 14th Dec., 1889
PROVISIONAL SPECIFICATION.
Improvements in or relating to Chimney Tops.
I, JAMES ARMITAGE of 7, St. James Square, Leeds, in the County of York, Estate
Agent, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in chimney tops, and has for its object the
prevention of any down draught that may be caused by cross currents, thus
preventing the smoke from "pouring" or puffing" out at the fire place end of the
chimney.
According to my invention, the chimney top may be made of metal or any other
suitable material, in a circular, square, or polygonal form. In the periphery or outside
portion of the chimney top are formed or cut two or more vertical apertures or
openings (preferably four) arranged opposite to each other. Each opening or aperture
is covered or closed by a suitable door which is hinged or pivoted to the framing or
outer portion or casing of the chimney top so as to open outwards, and the doors
are connected together in pairs by a suitable bar so that when one door is closed
by the air currents the opposite one will be opened for the exit of the smoke or
other gases.
But should the air current change or veer to the opposite side of the
chimney top, the door on that side will by the pressure of the current be instantly
closed which automatically, opens the opposite one.
The above described top may be easily applied to existing chimnies or tops at a
small cost without necessitating structural alterations.
Dated this Nineteenth day of February 1889,
JAMES ARMITAGE.
By W. Fairburn-Hart,
COMPLETE SPECIFICATION.
Improvements in or relating to Chimney Tops.
I, JAMES ARMITAGE of 7, St. James Square Leeds, in the County of York Estate
Agent, 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 chimney tops, and has for its object
the prevention of any down draught that may be caused by cross currents, thus
preventing the smoke from "pouring" or puffing" out at the fire place end of
the chimney.
The invention consists in fixing to the outer portion of the chimney top, or
smoke outlet a covered box or chamber of any suitable diameter or shape provided
with two or more vertical (preferably four) openings or apertures each of which
is covered or closed by a door which is hinged or pivoted to the outside of the
framing or casing. These doors are arranged to work in pairs and are connected
together by a bar or rod so that when one door is closed by the air current the
opposite one will be opened for the exit of the smoke or other products of
combustion.
In the drawings-
Figure 1. is an elevation, Fig. 2 a sectional elevation, and Fig. 3 a sectional plan of
a chimney top constructed according to my invention. Fig. 4 a perspective view of
a top fixed to a chimney stack.
Like parts in all the views are marked with the same letters of reference.
C is a chimney, shaft or pipe which is surmounted by a covered box, cylinder, or

page_text: chamber D of a larger diameter and shape than that of the shaft C. The shaft C
and box D may be made of any suitable material, such as cast metal, copper,
galvanized iron, sheet iron, zinc, terra cotta, earthenware, or the like, and they
(one or both) may be either circular, square, polygonal in form or shape. In the
periphery or outer portion of the chamber D are cut or formed two or more vertical
and rectangular (or other suitable shape) openings or apertures arranged opposite
(or nearly so) to each other, and extending to within, say about an inch or two of the
underside of the cover and above the bottom of box or chamber D. In the
drawings I have shown the shaft C cylindrical surmounted with a square box or
chamber D provided with four openings or apertures d² d³ ³ ³ (one aperture on each
side of the square box) but I would have it distinctly understood that 1 do not limit
myself to the precise arrangement of parts shown either as regards their shape or
configuration, or as to the number of openings or apertures, or to any of the dimensions
herein given as they all may be varied or modified as circumstances may require, but
what I do consider essential is that the number of openings or apertures shall be so
arranged so as to permit any two of the doors E E E E³ (to be hereafter described)
working in pairs opposite (or nearly so) to each other.
To the outer portion or perimeter of the casing box or chamber D and on one side
of each of the apertures da d³ d d is hinged or pivoted one of the doors E, E¹, E', E³,
as shown at Figs. 1 and 4. Each door is so hinged and arranged that it shall open
outwards, and when closed covers one of the apertures or openings. The doors E, E',
E, E are arranged to work in pairs, that is door E is coupled or connected to the
door E opposite (or nearly so) to it by a rod or link F, while doors E and E³ are
connected or coupled together by rod or link F¹, both as shown at Figs. 2 and 4.
The rods F. and F may be preferably coupled to their respective doors a little above
and a little below their centres so that the rods may cross each other without coming
in contact. Each door may be made in one or more portions, but I prefer making
them in one piece as shown in the drawings.
When the direction of the wind or air current is as shown by arrows at Figs. 3
and 4 the doors E and E' which cover apertures d² d³ will be closed to prevent the
air currents from entering the chimney top, while doors E2 E3 by being coupled to
the aforesaid doors as described will be opened whereby a free and unobstructed
opening or openings is or are provided for the exit of the smoke or other products of
combustions. But should the air currents change or suddenly veer round to the
opposite side or portion of the chimney top then the doors E2 E3 will be automatically
and instantly closed by the pressure of the currents, and the doors E E¹, closing
apertures d d simultaneously opened to form an exit for the smoke or other products
of combustion. The above described top may be easily applied or fixed to existing
chimnies or tops G at a small cost as shown at Figs. 1 and 2 by passing the part
within the chimney or pot; or the stem may be prolonged and built into the
brickwork in the same manner as chimney tops or pots of ordinary construction
without necessitating structural alterations, and it may also be used as a ventilar.
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 manufacture and use of a chimney top, applicable also as a ventilator such
as herein described consisting of a chimney shaft such as surmounted by a fixed
larger box or chamber D closed at its upper end and communicating at its lower end
with the shaft C, said chamber having two or more openings or apertures such as
d² d³d d³, and a corresponding number of doors (one for each aperture) such as E, E,
E², E³ hinged or pivoted to the outer side or perimeter of the box or chamber, arranged
and linked together to work in pairs substantially as and for the purposes herein sei
forth.
2. In a chimney top, the combination with a. chimney shaft, such as C, of an
enlarged and covered box or chamber, such as D, communicates at its lower end with
the shaft C, said box or chamber having any desired number of doors linked together

page_text: in pairs and hinged or pivoted to opposite (or nearly so) parts of its outer portion or
perimeter capable of being operated by the air currents for closing an aperture cut or
formed in one portion of the box or chamber and simultaneously opening an
aperture in an opposite (or nearly so) portion thereof as and for the purposes set
forth.
3. In a chimney top, the combination of a box or chamber D having two or
more openings or apertures cut or formed in its outer sides or perimeter opposite (or
nearly so) to each other with any desired number of doors such as E, E¹, E², E³
(hinged or pivoted on the outer portion of the chamber or box and coupled together
in pairs by a link or links such as F F¹) corresponding in number with the openings
or apertures whereby the vertical opening or openings on one side of the part or top
may be closed by the air currents, and the opening or openings on the opposite side
or part thereof simultaneously opened as and for the purposes set forth.
4. The combination of the herein described chimney top with an ordinary chimney
top or stack such as G without structural alterations substantially as illustrated at
Fig. 4.
Dated this Twelfth dex of November 1880
JAMES
ARMITAGE.
By W. Fairburn Hart,
Agent.