Improvements in Ventilators.
Year: 1893

page_text: Date of Application, 28th Mar., 1893
Complete Specification Left, 16th Dec., 1893-Accepted, 20th Jan., 1894
Improvements in Ventilators.
We, HANS LAURITZ HANSEN, of Harroby Street, Liverpool, in the County of
Lancaster, Engineer, and WILLIAM WALKER, of Coltart Road, Liverpool,
aforesaid, Secretary, do hereby declare the nature of this invention to be as
follows:-
:-
This invention relates to that class of ventilators which are known as automatic
or in which the wind striking the outer surface of the baffle plates creates the
suction or the upward current in the shaft.
It consists essentially in constructing the baffle plates in a curved form from the
bottom to the top of the ventilator so as to form the ventilator of spherical or
globular form, or instead of being curved the baffle plates may be bent to
hexagonal or other angular form.
In carrying out the invention we prefer to use two, three, four or more sets of baffle
plates one inside the other each alternate one being set opposite to the space left
between the two preceding ones. Each plate is preferably made with a groove or
bead at the edge to arrest the travelling of water or moisture along it.
The baffle
plates at their lower ends are attached to the outlet shaft and are preferably bent
over in one piece from end to end the several plates being connected together by a
bolt passed through them at the top. These plates pass alternately one over the
other each set being separated from the next and bolted so that one set will not
touch the other and each fixed at about equal distances. In the larger sizes the
baffle plates at their upper ends are bolted rivetted or otherwise attached to a
central plate one for each set through which the connecting bolt passes.
To give
a more uniform appearance and enlarged openings and free outlet for the air the
outer set of baffle plates may be tapered longitudinally from the centre to each
end, in the inner sets however we at present prefer to make the plates of the same
width throughout.
By bolting the different sets of plates together without touching the wind has a
clean sweep round without any obstruction or any plates to impinge against
except the centre rod which holds the plates at their proper distance apart. By
adopting this shape and form of structure an extraordinarily large area of opening
is obtained compared with others and the openings occurring all round the sphere
or globe many of them catch the prevailing winds with equal effect from all
quarters of the globe and thus a largely increased suction power is obtained larger
than the shaft connecting it, and the head or cowl is more compact than other
ventilators. No hood or roof is required because the baffle plates in their curved
form reach up to the top.
We consider that this ventilator will be practically weather and water proof that
it will be most sensitive and efficient and will overcome many of the drawbacks
experienced in other ventilators.
The roof of a ships deck house or stoke hole ladder way could be covered by this
type of ventilator and have a large outlet and proof against water getting in
excepting the head be entirely submerged.
It is also an excellent spark arrester for fixing on engine or boiler funnels.
Dated this 27th day of March 1893.

page_text: By bolting the different sets of plates together without touching, the wind has a
clean sweep round without any obstruction or any plates to impinge against except
the centre stud or bolt G and washers H which hold the plates at their proper
distance apart. By adopting this shape and form of structure an exceptionally
large area of opening is obtained compared with others and the openings occurring
all round the sphere or globe many of them catch the prevailing winds with equal
effect from all points of the compass and thus a largely increased suction power is
obtained with a very compact head or cowl. No hood or roof is required because
the baffle plates in their curved form reach up to the top.
We consider that this ventilator will be practically weather and water proof, that
it will be most sensitive and efficient and will overcome many of the drawbacks
experienced in other ventilators.
This form of ventilator may be applied with advantage to the roof of a ship's
deck house or stoke-hold ladder way as it would provide a large outlet area whilst
being proof against the inlet of water unless it were entirely immersed or
submerged.
It will also be found to be an excellent spark arrester for fixing on engine or
boiler funnels, or cowl for preventing down blow in any chimney flue.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, we declare that what
we claim is:—
1. A ventilator of spherical or globular form constructed of a number of bent
or curved baffle plates in two or more sets, one set being placed inside the next the
plates and spaces alternating one with the other substantially as described.
2. A spherical ventilator or cowl having the several parts constructed and
arranged substantially as herein described and shown.
Dandhi 15th das of December 1902
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.