Improvements in Hoods or Cowls for Ventilating or other Shafts.
Year: 1892

page_text: Date of Application, 20th Jan., 1892
Complete Specification Left, 20th Oct., 1892-Accepted, 26th Nov., 1892
PROVISIONAL SPECIFICATION.
Improvements in Hoods or Cowls for Ventilating or other Shafts.
We, HANS LAURITZ HANSEN, Foreman, JOHN ROBERT HALDENBY
KEYWORTH, Agricultural Engineer, HENRY JOSEPH KEYWORTH, Agricultural
Engineer, and WILLIAM WALKER, Secretary, all of No. 35 Tarleton Street,
Liverpool, in the County of Lancaster, do hereby declare the nature of this
invention to be as follows:-
This invention is designed with the object of preventing the flow or passage of
water into or through the ventilating shaft while at the same time allowing the
egress or ingress of a current of air equal to the full capacity of the shaft and
although primarily designed for use on ship board, may be applied to shafts for
ventilating other structures or buildings.
It consists essentially in constructing a trumpet mouthed cowl with an upward
turn or bend in the shaft above the head of the mouth and with a ball or other
valve and valve seating below, against which the valve is floated at which point the
tube is enlarged should a quantity of water enter at the mouth or be dashed against
the ventilator it prevents the same from entering the vertical shaft or other com-
partments by the said ball or valve closing the tube.
In carrying out the invention we preferably construct the cowl with the tube as
it leads from the mouth bent or curved up round the exterior edge of the trumpet
mouth forming as it were a rim or extension thereof.
Instead however of carrying the tube round the edge of the trumpet mouth it
may be bent in U shape at the back or side.
For the lower bend a chamber is formed larger than the tube it has to serve and
large enough to contain a ball or other valve beside or over which the current of
air can pass and higher up in the bend is formed a valve seating. The valve is
buoyant so that in case the chamber becomes filled with water it is floated up
against its seating and the tube closed thereby preventing any passage of water
therethrough.
41
When applied to buildings or other situations where no great volume or rush of
water comes at a time, the valve may be dispensed with as the upward bend of the
tube will prevent the water accumulating of rising up and flowing down the tube.
In the bottom of the bend or chamber a small port or hole is placed through
which any water or spray cán run off or escape. This hole may be covered by the
ball or other valve or may be sufficiently small not to interfere with the current of
air, there being a full passage for the air to pass.
In order to render the cowl available for an up cast as well as down cast
ventilator, a flap or hole may be placed at the back of the trumpet mouth through
which the air can pass to create a suction or up draught.
.
The cowl is preferably made with a downward projecting tube which fits over
the ventilating tube or shaft and' can be rotated or swivelled thereon a suitable
joint being formed therein.
Dated this 19th day of January 1892.
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.

page_text: .
r
.
COMPLETE SPECIFICATION.
Improvements in Hoods or Cowls for Ventilating or other Shafts.
We, HANS LAURITZ HANSEN, Foreman, JOHN ROBERT. HALDENBY
KEYWORTH, Agricultural Engineer, HENRY JOSEPH KEYWORTH, Agricultural
Engineer, and WILLIAM WALKER, Secretary, all of No. 35 Tarleton Street,
Liverpool, in the County of Lancaster, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
This invention is designed with the object of preventing the flow or passage of
• water into or through the ventilating shaft while at the same time allowing the
egress or ingress of a current of air equal to the full capacity of the shaft and
although primarily designed for use on ship board, may be applied to shafts for
ventilating other structures or buildings.
It consists essentially in constructing a trumpet mouthed cowl with the shaft or
tube bent upwards from a point below the mouth with a cavity to hold a ball or
other buoyant valve and valve seating placed therein so that should a quantity of
water be dashed against and enter the mouth of the cowl the ball is floated against
its seating and prevents the water entering or flowing into the vertical shaft or
tube.
It will be fully described with reference to the accompanying drawings.
Fig. 1. front elevation.
Fig. 2. side elevation.
Fig. 3. perspective view from the back.
Fig. 4. front elevation of modified form.
Fig. 5. side elevation of same.
Fig. 6. front elevation of another modification.
Fig. 7. side elevation of same.
The cowl or hood is constructed with a trumpet or flaring mouth A the tube A¹
from which is bent or turned up round the exterior edge of the trumpet mouth A
forming as it were a rim or extension thereof. (See Figs. 1, 2, 3.)
Instead of carrying the tube A leading from the trumpet mouth round the
outer edge thereof it may be bent into U shape cither to the back or side as shown
in Figs. 4-7.
The tube A is formed with a cavity or chamber C at its lower bend much
larger than the capacity of the air tube to contain a ball valve D or other buoyant
valve. Above the cavity or chamber is formed a valve seating d against which
the valve can act to close the passage of the tube. When the valve D is in the
lower position shown by the dotted lines it does not obstruct the passage of the air
collected by the mouth A but the air passes over the valve and through the upward
bend of the pipe thence to the vertical tube G. Should however the water splash
into the mouth of the cowl it collects in the chamber C and floats the valve Dup
against the seating d and closes the tube A¹ thereby preventing any passage of
water therethrough. The ball valve D is prevented, rising up the tube A¹ in the
wrong direction by guide wires E stretched across.
In the bottom of the chamber C a small port or hole F is placed through which
any water or spray can run off or escape. This hole may be covered by the ball
or other valve or may be sufficiently small not to interfere with the current of air,
there being a full passage for the air to pass.
When applied to buildings or other situations where no great volume or rush of
water comes at a time the valve may be dispensed with as the upward bend of the
tube will prevent the water accumulating or rising up and flowing down the tube.
In order to render the cowl available for an upcast as well as down cast ventilator
a flap or hole B may be placed at the back of the trumpet mouth through which
the air can pass to create a suction or up draught.

page_text: The cowl is preferably made with a downward projecting tube which fits over
the ventilating tube or shaft H and can be rotated or swivelled thereon a suitable
joint being formed therein.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. A trumpet mouthed cowl or hood constructed with the tube or pipe curved
or bent up above the mouth substantially as and for the purposes described.
2. In a cowl or hood the combination with the trumpet mouthed orifice of the
tube or pipe bent or curved upward above the mouth provided with a cavity or
chamber for a valve the valve seating placed therein and the buoyant valve to
close the tube when filled with water substantially as described.
3. A cowl or hood for ventilating shafts constructed substantially as described
and shown with reference either to Figs. 1-3, Figs. 4-5 or Figs. 6-7 of the
accompanying drawings.
Dated this 19th day of October 1892.
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.