Improvements in Air Pumping Machines.
Year: 1899

page_text: Date of Application, 17th Nov., 1899-Accepted, 23rd Dec., 1899
COMPLETE SPECIFICATION.
Improvements in Air Pumping Machines.
-
I, WILLIAM AUGUSTUS GORMAN, trading as Siebe, Gorman & Co., of 187, West-
minster Bridge Road, in the County of London, Engineer, 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:-
My invention relates to improvements in air pumping machinery more parti-
cularly applicable for supplying air to a person submerged in water or in an
irrespirable gas.
In the accompanying drawing:-
Figure 1 is a side view, partly in section of the apparatus,
Figure 2 is a front view of the same.
My apparatus comprises three cylinders A A A open at the bottom and in
which work pistons B Figure 1. These pistons are connected by means of rods C
to a crank-shaft 1) adapted to be actuated by handles E (not shown complete in
the drawing as their design is immaterial) and provided at each end with a fly
wheel F.
The cylinders A A A are encased in a single water cistern W common to them
all, for the purpose of keeping them cool while at work.
The action of the pump is as follows:--As each piston B rises or falls in its
cylinder A, owing to the rotary motion of the crankshaft D, air is alternately
drawn into and expelled from the cylinder A, the inlet valve being shewn at C
These valves are faced with
Figure 1, and the outlet valve at H Figure 1.
leather and are kept up to their seats by spiral springs J J. The air on being
expelled through the passages K Figure 1 finds its way into a reservoir L com-
mon to the three pumps, whence it passes down the air pipe to the diver.
Access to the valves G H is obtained by unscrewing the caps M M fitted over
them without the inconvenience of turning the pump over sideways or back-
wards as has hitherto been necessary.
A pressure gauge P is directly connected to the air reservoir L, the said gauge
having upon its dial a double graduated scale. S s showing at the same time the
pressure of the air being supplied to the diver, and the corresponding depth of
water into which the latter has descended.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
I
1. In air pumping machinery the combination of three open bottom cylin-
ders A A A contained in a common water cistern W and connected at one end
by passages K terminating in a common air reservoir L substantially as herein-
before described and illustrated.
2. The use in combination with apparatus of the kind described in the pre-
ceding claiming clause of an air pressure gauge showing simultaneously upon
its dial, by means of two graduated scales, the pressure of the air which is being

page_text: pumped to the diver, and the depth of water to which the latter has descended,
substantially as set forth.
3. In apparatus of the kind described in Claim 1 the arrangement whereby
access can be readily had to the inlet and outlet valves without the necessity of
turning the pump over backwards or sideways, substantially as herein before
described and illustrated.
4. The combination and arrangement of parts forming the improved pump-
ing machine herein before described and illustrated in the accompanying drawing.
Dated the 17th day of November 1800
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.