Improvements in Ventilating Apparatus.
Year: 1898

page_text: Date of Application, 14th Apr., 1898
Complete Specification Left, 16th Jan., 1899-Accepted, 25th Feb., 1899
PROVISIONAL SPECIFICATION.
Improvements in Ventilating Apparatus.
We, JAMES MCHARDY, of 83, Talgarth Road, West Kensington, Teacher of
Music, and DAVID STANLEY FROY, of Brunswick Works, Hammersmith, Merchant,
do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in apparatus for the purposes of ventila-
tion, and has for its object to provide an arrangement which will ventilate rooms,
passages, tunnels, and the like in a simple and efficient manner.
In carrying out our invention we propose to employ a suitably constructed
bellows or air-chamber provided if necessary with inlet and outlet valves. We
prefer however to use a bellows-arrangement worked by a hydraulic or other
suitable engine.
The bellows may be of double action or a spring or weighted compensating
bellows may be provided. The air may be drawn in the first place from a suit-
able chamber or strong, bellows or from pipes or conductors of any kind. Pipes
or their equivalents pass to the rooms or other places to be ventilated, and ter-
minating in perforated heads allow of the passage of a given quantity of air in
a given time at a given suction-power.
In order to prevent the waste of power the spring or weighted bellows, or an
additional small spring or weighted bellows may be arranged to stop the supply
of power when the desired suction is established. Whenever the suction force
drops below the proper level the bellows will turn on the power again, thus auto-
matically regulating the ventilation. Suitable throttle valves or stop cocks may
be fitted to the pipes communicating with the chambers or groups of chambers
to be ventilated so that the ventilation through each part of the apparatus may
be cut off or regulated as desired. With this arrangement one apparatus may be
used to ventilate any number of chambers or groups of chambers and as the pipes
may be led to any distance, a single engine will serve for the ventilation of a
large building.
The ventilating pipes are preferably open at the top of the chamber or tunnel
so as to draw out the foul air before it has time to cool and descend, the impure
air then being ejected at any desired distance.
A spring or weighted bellows influenced by the suction-force, actuates a lever
or other suitable appliance, whereby the motive power is turned off or on accord-
ing to the aforesaid suction-force.
When air is withdrawn, the bellows will tend to collapse, and draw up the
lever or other suitable appliance, whereupon the motive power will gradually be
shut off. When the air re-enters the bellows will expand and turn on the motive
power.

page_text: Improvements in ventilating Apparatus.
We, JAMES MCHARDY, of 83, Talgarth Road, West Kensington, Teacher of
Music, and DAVID STANLEY FROY, of Brunswick Works, Hammersmith, Merchant,
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 improvements in ventilating apparatus, and has for
its object to provide an arrangement which will ventilate rooms, passages, tunnels
and the like in a simple and thoroughly efficient manner.
In order that this our said invention may be the more readily understood and
carried into practical effect reference is hereby made to the accompanying sheet
of illustrated drawings, wherein;—
Fig. 1 is a diagrammatic view shewing the manner in which the air is
exhausted, and
Fig. 2 is a similar view of the system of suction pipes.
Referring to the drawings, wherein like letters of reference indicate corre-
sponding parts wherever occurring throughout the drawings.
a and b represent bellows worked by a hydraulic or other suitable engine or
motor (not shewn). Pipes or tubes d communicate with these bellows a and b
and with a main suction pipe or tube e having branches e¹ leading into the com-
partments or the like to be ventilated. These branch pipes or tubes e¹ terminate
in heads e of any suitable form, such heads being perforated as at o³.
Leading from the bellows a and b are exhaust pipes or tubes f which combine
at, and merge into, a main exhaust pipe or tube g leading to any point where is
is desirable that the foul air be discharged.
represents a third bellows having a free communication with the main
suction pipe or tube e, such bellows being suitably weighted as at h¹ in order
that it may be maintained in a normally distended condition. This bellows h
is connected with a stop cock or its equivalent on the water-supply pipe of the
hydraulic engine, or to any other convenient part of what ever motor is employed
to actuate the bellows a and b.
In operation, when the motor makes a stroke to the right, the bellows a draws
the air from the rooms or the like in at the perforations in the heads and
through the main pipe or tube e and the pipes or tubes d, while a stroke of the
piston in the other direction forces the air through the pipes or tubes f and
through the main exhaust pipe or tube g.
If the power generated is greater than the suction exercised by the bellows a,
the bellows will be compressed and the supply of power shut off until the εaid
bellows his again distended and the power consequently again laid on.
It is essential that the area of the pipe or tube e exceeds the combined areas of
all the perforations e³, as thereby the power of suction will be equal, no matter
how far apart are the said perforations or groups of perforations.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:
1. The improvements in ventilating apparatus, consisting in pipes d leading
from independent bellows a and b (or their equivalent) to a main suction pipe e
having branches e terminating in heads provided with perforations e³ whose

page_text: combined areas are less than the area of the pipe e; in combination with exhaust
pipes communicating with said bellows (or their equivalent) and with a main
exhaust pipe g,
said pipes d and e also communicating with a weighted com-
pensating bellows h, all arranged, combined and operating, substantially as
described and as illustrated by the drawings.
2. In ventilating apparatus, the system of suction pipes and exhaust pipes as
herein before describer, in combination with suitable means for establishing
suction and exhaust herein, substantially as specified.
Dated this 14th dox of Tanuoru 1800
HUGHES, SON & Co.,
38, Chancery Lane, London, W.C., For the Applicants.