A New or Improved Construction of Chimney or Ventilator Top.
Year: 1896

page_text: Date of Application, 10th Feb., 1896-Accepted, 21st Mar., 1896
COMPLETE SPECIFICATION.
A New or Improved Construction of Chimney or Ventilator Top.
I MONTAGUE HENRY FOSTER, of Stubbington House, Fareham, in the
County of Hants, Gentleman, 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 a new or improved construction of chimney or ventilator
top wherein air currents are prevented entering said chimney or ventilator top and
yet free passages are afforded for the exit of the smoke or foul air.
The chimney or ventilator top, in accordance with this invention, is as will
hereinafter more particularly appear, provided with apertures for the passage of
smoke and other products of combustion or foul air which apertures are controlled
by suitably arranged hinged flaps or covers acted upon in such manner by the wind
as to automatically close such of the apertures as may face the direction from
whence the air current travels and at same time open the smoke or foul air outlets
upon the other side of chimney or ventilator top, thereby effectually preventing
the entry of air currents to the chimney or ventilator shaft whilst at same time
permitting a free exit of the smoke and foul air.
And in order that this invention may be fully understood I will describe same
with reference to the accompanying drawings wherein
Fig. 1 represents in sectional elevation a chimney-top constructed in accordance
with this my said invention. Fig. 2. is a sectional plan thereof through line A. B
Fig. 1, and
Fig. 3. is a perspective view of the upper portion of the chimney top with the
cover removed.
Similar letters of reference indicate like parts in each of the figures.
a is the chimney top which may be of galvanized iron, zinc, sheet metal, copper,
or other suitable material.
This chimney top a is fixed upon the top of the ordinary chimney or ventilating
stack and is preferably formed with a flange a¹ around its base by means of which
it may be bricked or cemented to said stack.
The chimney top a is closed in by a cover b which is preferably raised at centro
to permit of the easy flow of any rain or wet therefrom.
In the sides and near the top of the chimney a are cut or otherwise formed
suitable apertures c arranged in pairs opposite to each other.
These apertures are covered by the flaps d, d', d, d³. These flaps are hinged at
their bottom edges e to the sides of the chimney top a so that they open outwards
and in such manner that the apertures c may be controlled by same.
The flaps d, d', d, d, are connected together, and work in pairs by means of
connecting bars, rods, or links ff.
The rod, bar or link f connecting flaps d, d and the connection f' coupling the
flaps d' d. These connecting rods, bars, or links may be rigid or jointed as may be
desired and are of such a length that whilst one flap is held in its closed position
against the chimney top the opposite one to which it is connected by means of said
rod, bar, or link will be open sufficiently to allow of the passage of smoke and other
products of combustion. To ensure effectual closing of the aperture and to stiffen
the flaps, they may when desired, be formed slightly heavier around their edges
than in the centre, or a stiffening wire may be run around said edges to effect these
purposes. gg are bars placed across the chimney to serve as a check to the sweep's

page_text: broom when the chimney is swept and thus prevent the flaps and connections being
injured.
The chimney tops constructed as above described, will be found particularly
advantageous for use upon high shafts or in any exposed position where they
will effectually prevent any gusts of wind blowing down the chimney causing them
to smoke.
It will readily be seen from the foregoing description and illustrations that as
the air current strikes the chimney top from one direction the flaps upon that side
of the chimney top are closed thereby opening the flaps coupled thereto upon
the other side of the chimney top preventing the entry of the wind into the
chimney top and yet permitting a free outlet of the smoke.
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 new or improved construction of chimney or ventilator top substantially?
as and for the purposes hereinbefore described and shewn.
2. The chimney or ventilator top a formed with cover b and apertures c in the
sides thereof; in combination with the flaps d, d¹, d, d, hinged at their lower
edge e to the side of the chimney top a and connected in pairs by the connecting
rods, bars, or links, ff; all arranged and operating substantially as and for the
purposes herein before described and shewn.
Dated this 10th day of February 1896.
HUGHES, SON & Co.,
38, Chancery Lane, W.C., Agents for the Applicant.