An Improved Windguard and Extractor for Chimneys, Ventilators, and the like.
Year: 1891

page_text: Date of Application, 19th Feb., 1891
Complete Specification Left, 19th Nov., 1891-Accepted, 19th Dec., 1891
PROVISIONAL SPECIFICATION.
An Improved Windguard and Extractor for Chimneys, Ventilators,
and the like.
We, ALBERT HIGGINS, Tinman and PHILIP WILLIAMS a member of the
firm of Strode & Co., Engineers both of 48 Osnaburgh Street, London in the
County of Middlesex do hereby declare the nature of this invention to be
as follows:-
This invention relates to an improved construction of windguard and extractor
for chimneys ventilators and has for its object to protect the discharge orifice of
any shaft from down draught and to induce an upward current, thus preventing
such disadvantages as the smoking of chimneys etc.
To this end we contract somewhat the area of the top of the shaft by a short
truncated cone or otherwise, and at a convenient distance below this we fix around
the shaft a projecting collar coned or sloped upwards and outwards: above the
orifice of the shaft at a suitable distance we fix an internally concaved cap or cover
of about the same diameter and projection at its base as the said collar so that a
certain space intervenes between it and the collar. The cap is preferably made
moveable or it may be mounted to slide upwards on its supports for cleaning and
the like.
By this arrangement side winds entering the space between the collar and cover
strike the upper coned end of the shaft and are directed by the concavity thus
inducing an upward current extracting the smoke or hot air ascending the shaft,
all escaping at the leeward side. Upward or downward gusts of wind strike the
outer sides of the collar or cap respectively as the case may be, causing a rarification
of the air within the cap extracting the contents of the shaft in a similar
manner.
Dated this 10th day of shrugu 1001
J. C. CHAPMAN,
Agent.
COMPLETE SPECIFICATION.
An Improved Windguard and Extractor for Chimneys, Ventilators,
and the like.
We ALBERT HIGGINS Iron Plate Worker and PHILIP WILLIAMS a member of
the firm of Strode & Co., Engineers, both of 48 Osnaburgh Street, London in the
County of Middlesex, do hereby declare the nature of this invention and the
manner in which the same is to be performed to be particularly described and
ascertained in and by the following statement :-
This invention relates to an improved construction of windguard and extractor
for chimneys, ventilators and the like and has for its object to protect the discharge
orifice of any shaft from down draught and to induce an upward current, thus
preventing such disadvantages as the smoking of chimneys, etc.
We will describe our invention in reference to the accompanying drawing
which is half an elevation and half a vertical section of our improved apparatus.
A may be the top part of a shaft, or it may be a cylinder of metal or suitable
material adapted to fit upon the top of a shaft as illustrated. The area at its
upper end is contracted to about two thirds the whole area of shaft or cylinder A
by means of a short truncated cone such as B, or otherwise in suitable manner; at
a suitable distance (hereinafter indicated) below this we fix around the shaft A a
I Price 6d1

page_text: projecting collar coned or sloped upwards as shown at C; above the open top of the
shaft at a suitable distance we fix a cap or cover D coned at an angle of about 50°,
inside D is fixed a concaved baffle plate E of about the same diameter as the
shaft A. The greatest diameter of C and D is preferred to be about two thirds
in excess of that of the shaft. internally, and the distance X intervening between
their bases may be advantageously about one third the diameter of the shaft A. It
is to be understood that the above stated dimensions are merely given as aids to
manufacture but are not arbitrary. The cap D is supported by bearers d and is
preferably made removable or it may be mounted and arranged to slide upwards
upon its bearers for cleaning and the like. By this arrangement side winds entering
the space X strike the cone B and arè directed by the concave plate E thus
inducing an upward current extracting the smoke or foul products from the shaft A,
all escaping on the leeward side as indicated by the full lined arrows; upward or
downward gusts of wind strike the outsides of the collar C and cap D respectively
as the case may be and are deviated as shown by dotted arrows to the right of the
figure. This causes a rarification of the air or gases within the said cap D, hence
extracting and educting the contents of the shaft A as shown, in a similar manner
to that above described.
Having now particularly described and ascertained the nature of this inven-
tion and the manner in which the saine is to be performed we declare that what
we claim is :-
-
1. The improved windguard and extractor for chimneys, ventilators and the
like substantially as described and illustrated.
2. In a windguard and extractor for the purposes set forth the combination with
the shaft A of truncated cone B, collar C, cap D with concave plate E the whole
constructed and arranged substantially as specified.
Dated this 19th day of November 1891.
J. C. CHAPMAN,
70, Chancery Lane, London, W.C.,
Chartered Patent Agent for the Applicants.