Double-acting Diaphragm-pump.
Year: 1898

page_text: Date of Application, 23rd Sept., 1898-Accepted, 29th Oct., 1898
Double-acting Diaphragm-pump.
We, THEODOR HAMMELRATH, Manufacturer, and GUSTAV SCHWENZER, Engineer,
both of 121, Kronprinzen Strasse, Dusseldorf, 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 or applicable to diaphragm-hand-
pumps which have been much used of late especially for raising water, and
have met with a very favourable reception, particularly in the building trades,
because they possess a relatively high efficiency and yet require but little power
for actuation and can be easily transported.
These pumps are usually constructed with and actuated by hand-levers which
require to be made of sufficient and sometimes inconvenient lengths to permit
of several persons working at them at the same time and particularly when
large quantities of water are required to be raised to any considerable
height.
Now although, as aforesaid, these pumps possess a relatively high efficiency,
the latter cannot be increased beyond a certain extent and their construction,
as hitherto formed, renders them inapplicable when really large quantities of water
have to be raised for a continuous or even short period.
The object of the present invention is to augment the efficiency of these single-
action pumps, and, to this end, we combine in a practical and convenient manner
two such pumps, and use cranks for driving the same instead of hand levers as
hitherto used, and, by so doing, can largely increase their efficiency without
requiring any materially higher driving power. A separate crank is provided
for each pump-cylinder and the two cranks are carried by a common spindle and
are set at an angle of 180° to one another, so that, when the spindle is rotated,
one crank will ascend whilst the other will descend. The spindle carrying the two
cranks, preferably an ordinary cranked shaft, may be driven by hand cranks, or,
by placing a pulley thereon, by mechanical power.
On the accompanying drawings:-
Fig. 1, represents such a twin-pump in side elevation ;
Fig. 2, represents a horizontal section thereof on the line A-B, Fig. 1;
and
Fig. 3, represents a vertical section thereof on the line C-D, Fig. 1.
P, P, represent two pumps, such as above indicated, placed side by side, each
being single-acting. The water enters by a suction pipe, R, common to both pumps
and connecting their lower portions, and issues by a delivery pipe, L, also common
to both pumps. Above the twin or double pump so formed and parallel with the
longitudinal axis thereof, there is provided a double-crank shaft, F, carrying two
cranks, G, G, which are placed exactly over the vertical longitudinal centre lines
of the two pump-cylinders. The cranks are set at an angle of 180° to one another,
and through the connecting-rods, H, H, actuate the two pistons of the double-
diaphragm-pumps alternately, and raise the water in a continuous stream. The
oscillating motion of the hand levers as usually employed in single-cylinder pumps
is here replaced by the advantageous continuous rotary motion of the crank
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page_text: shaft, F. This rotation may be produced by hand cranks, K, applied to the shaft
or by mechanical power by placing a pulley thereon.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is
-
A double acting pump, more particularly applicable for use in the building
trades, consisting of two single-action diaphragm-pumps, P, connected by a suction
pipe, R, common to both and by a delivery pipe, L, also common to both, the
diaphragm pistons of which are actuated by two cranks, G, G, set at an angle of
180° to one another and carried on a common shaft, F, driven by hand cranks, K,
or by mechanical power, as set forth.
Dated thin 92-1 day of Santambo 1908
DAY, DAVIES & HUNT,
Chartered Patent Agents, 321, High Holborn, London, W.C.,
Agents for the Applicants.