IMPROVEMENTS IN OR APPLICABLE TO THE CONSTRUCTION OF SMOKE EXTRACTORS OR VENTILATORS
Year: 1884

page_text: We, CHARLES LAWRENCE, Manufacturer, and ELI JAMES SEARLE, Foreman, both
of Insurance Chambers, High Street, Southampton, in the County of Hants, do
hereby declare the nature of our invention for "IMPROVEMENTS IN OR APPLICABLE
TO THE CONSTRUCTION OF SMOKE EXTRACTORS OR VENTILATORS" to be as follows:-
This Invention relates to certain improvements in or applicable to the construction
of smoke extractors or ventilators.
The improved smoke extractor or ventilator is made with a shaft of a rectangular
or other desired form or shape suitable to the position the apparatus is intended to
occupy, and which may be made in one or more parts of metal wood or any
suitable material, the sides of the shaft being made with opposite openings, or the
shaft may be of any equivalent formation made with opposite openings.
The top of the shaft is closed, and may be made with overhanging ridges, and
the angles of the shaft, or the parts thereof between the said openings, are formed'
with extensions wings or guides, between which loosely hanging flaps depend from
hinges or equivalent connections situated at the upper part of the shaft or pot and
immediately under the said ridges. The flaps are suspended immediately outside
the said openings, and the opposite flaps are connected by a cross rod or equivalent
means in such a manner that when in their normal positions all the flaps have a
tendency to hang clear of their respective openings to allow of the free escape of
the smoke from all the openings.
The action of the improved apparatus when used as a smoke extractor, is, that
the wind, from whatever quarter it comes, impinges against one or other of the
said flaps, causing it or them to close the respective openings they cover, and 'by
means of the connecting rods the opposite flap or flaps is or are consequently more
fully removed from the respective openings they cover, and the passing current of
air aids the natural up draft and induces a more speedy extraction and escape of
the smoke.
There is no possibility of down draught with this improved apparatus, because
the impinging of the wind against any of the said flaps immediately closes it or

page_text: them against the windward openings, and it is only the passing current of the air
which induces a suction and up draught within the shaft and the extraction and
escape of the smoke.
When used more especially for ventilating purposes and for removing vitiated
air from rooms, the apparatus is similarly constructed, and the shaft is further
fitted with a finely perforated diaphragm or the said opposite openings, may be
similarly fitted, the object being to prevent any rush of air and to cause a
continual and gentle escape and change of air.
The shaft or pot may be fixed in position in any suitable manner and additional
lugs may be provided for further securing the same in position.
* DAY, DAVIES & HUNT,
Agents for the Applicants.

page_text: We CHARLES LAWRENCE, Manufacturer, and ELI JAMES SEARLE, Foreman, both
of Insurance Chambers, High Street, Southampton, in the County of Hants, do
hereby declare the nature of our Invention for "IMPROVEMENTS IN OR APPLICABLE
TO THE CONSTRUCTION OF SMOKE EXTRACTORS OR VENTILATORS" 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 certain improvements in or applicable to the con-.
struction of smoke extractors' or ventilators.
The improved smoke extractor or ventilator is illustrated on the accompanying
drawings in Figs; 1, and, 2, which respectively represent a sectional elevation, and
a sectional plan. It is made with a shaft, 1, of a rectangular or other desired form
or shape suitable to the position the apparatus is intended to occupy, and in the
sides of which there are formed opposite openings, 2. The shaft may be made in
one or more parts, of metal, wood, or any suitable material, or it may be of any
equivalent formation made with opposite openings.
The top of the shaft is closed at, 3, and is preferably made with overhanging
ridges, 4, and the angles of the shaft or the parts, 5, thereof between the said
openings are formed with extensions, wings, or guides, 6, between which loosely
hanging flaps, 7, depend from hinges, 8, or equivalent connections situated at the
upper part of the shaft or pot and immediately under the ridges, 4. The flaps, 7,
are suspended immediately outside the openings, 2, and the opposits flaps are
connected by a cross rod or equivalent means, 9, in such a manner that when in
their normal positions, vide the flaps shown in full lines in Fig; 1, all the flaps
have a tendency to hang clear of their respective openings, to allow of the free
escape of the smoke from all the openings as indicated by the arrows, 10.
In a smoke extractor, the rods 9, are curved to the shape of the shaft, 1, or
are made of such a form as will allow of free passage to the sweep's brush for
cleaning.
The action of the improved apparatus when used as a smoke extractor, is, that
the wind (from whatever quarter it comes) impinges against one or more of the
flaps, 7. If it strikes full against any one flap, as indicated by the arrow, 11, it
closes it against the opening, 2, it covers, as shown in dotted lines in Fig; 1, and
full lines in Fig; 2; and if it strikes in an angular direction against any two flaps
as indicated by the arrows, 12, it closes them against the respective openings they
cover, and in either case the connecting rod or rods, 9, cause the opposite flap or
flaps to be more fully removed from the respective openings covered thereby, so
that the passing current of air aids the natural up draught and induces a more
speedy extraction and escape of the smoke.
There is no possibility of down draught with this improved apparatus because.
the impinging of the wind against any of the flaps, 7, immediately closes it or
them against the windward openings, and it is only the passing current of the air
which induces a suction and updraught within the shaft and the extraction and
escape of the smoke.
When intended to be used specially for ventilating purposes and for removing
vitiated air from rooms, the apparatus is similarly constructed, and the shaft is
further fitted with one or more finely perforated diaphragms, 13, or the said
opposite openings, 2, may be similarly fitted as shown at, 14, Fig; 2, the object
being to prevent any rush of air, and to cause a continual and gentle escape and
change of air. Or a perforated cover may be fitted to the shaft externally of the
said flaps, 7.
"

page_text: .
The shaft or pot may be fixed in position in any suitable manner, and additional
lugs, 15, may be provided for further securing the same in position.
Having now particularly described the nature of our said Invention and in
what manner the same is to be performed, we declare that what we claim is:—
The herein before described improvements in or applicable to the construction of
smoke extractors, such improvements consisting in the formation thereof with a
shaft of a rectangular or other form made with opposite openings, and with a closed
top, and with extending wings, at the angles, forming parallel guides; and in the
combination therewith of loosely hanging flaps suspended fromabove the openings
so as to cover the same, the opposite flaps being connected by cross rods or
equivalent means and working between the said parallel guides; and in the further:
combination with such a construction of apparatus when used, specially for:
ventilating purposes of finely perforated diaphragms fitted to the said shaft or to
the openings therein, substantially as described with reference to the accompanying
drawings.
1.1
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