Improvements in and connected with Pumps.
Year: 1895

page_text: COMPLETE SPECIFICATION.
Improvements in and connected with Pumps.
I, WILHELM LEDERLE, of Freiburg, in the Grand Duchy of Baden, German
Empire, Manufacturer, 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 refers to pumps as used for sucking and forcing water, and my
improvements in pumps of said sort relate to certain arrangements and combinations
of parts, as will be more fully described hereinafter.
Referring to Figure 1 of the accompanying drawing, a designates a casing
having at one end an extension a', and containing, or forming, in its lower half a
cylinder a 2 (Fig. 2); the piston 6 of the latter is connected by the connecting-
rod c to a lever d, that is arranged within said extension a¹, and is secured to a
shafte having at its outer end a lever-like handle (Fig. 3). Said shaft e passes
through a stuffing-box g, which is the only one of the whole pump. Stuffing-boxes
cause, as is known, a rather great friction, the latter being, as a matter of course,
the greater the number of stuffing-boxes employed in one engine or machine.
There is thus more power required for a pump having several stuffing-boxes than
for a pump having but one stuffing-box; I have made this arrangement possible by
arranging the lever d within the casing or extension a', which arrangement affords
the further advantage of 'using said casing or extension a¹ as a bearing or bearings.
for the said shaft e. The combination of said three points i.e. arranging the lever d
within the casing a', employing the latter as a bearing or bearings for the shaft e,
and letting this shaft pass through only one stuffing-box, forms a characteristic
feature of my invention.
The cylinder a 2 carries the valve-casing a 3 (Figs. 1 & 2), which is connected
with the suction-pipe (not shown) by the aperture a 4. The pump shown is a
double-acting one, and the casing a 3 is, therefore, provided with two suction-
valves. These valves consist each of a hemispherical body g having a downwardly
extending projection g¹ of comparatively great weight, this weight being such a
one, that the proper horizontal position of the body g is constantly maintained. In
contradistinction to so-called ball-valves there is in my afore described valves-
which I term pendulum-valves-the advantage, that they do not require special
guides preventing them from leaving their seats altogether.
The space above the valve-casing a 3 is divided by means of a rib or partition-
wall a 5 into two chambers, which at their tops are closed by a plate a resting
upon the casing a, and carrying the delivery-valves; the construction of the latter
is exactly the same as that of the suction-valves. The top of the whole pump is
formed by an inverted casing a 7 having ribs a 8, the latter limiting. the strokes of
the delivery valves, whereas these valves limit in their turn the strokes of the
suction-valves.
The packing-rings of the piston bare formed by hemp; this enables me to
exchange said rings with great convenience and facility.
The manner of operation of my afore described improved pump does not differ
from the ordinary double-acting pump known to everyone versed in the art in
question, and I have therefore dispensed with a special explanation thereof.
Referring to Figure 4, there is that difference in the construction, that I have
combined my novel arrangement of valves with two single-acting pumps instead of
with one double-acting one. a2 a 2 are the cylinders of said two pumps; the

page_text: pistons of the same are operated from the lever f¹ by the mediation of the
connecting-rods c', as in an ordinary fire-engine. The parts a 3, a 5, a 6, a 7, as
well as the pendulum-valves g g' are similar to the correspondingly designated
parts of the construction shown in Fig. 1-3. The air-vessel is arranged
between the cylinders a 2 a 2, and secured to the top of the casing a 7. Also the
first described pump may, as a matter of course, be furnished with such a vessel.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
:claim is :-
1. In a pump, the combination with an outer casing containing a cylinder, of an
extension containing a lever connected with the piston of said cylinder; said lever
being secured to a shaft having its bearings forined by said extension; means for
operating said shaft, substantially as described.
2. In a pump, the combination with an outer casing containing a cylinder, of a
valve-casing arranged above said cylinder, and having valves consisting each of a
hemispherical or calotte-like body, and of a weight secured to the lower side of
said body, substantially as described.
3. In a pump, the combination with an outer casing containing a cylinder, of a
suction-valve casing arranged above said cylinder; a delivery valve plate arranged
above said suction valve casing; a partition wall arranged between the latter and
said delivery valve plate, and separating the pump-chambers communicating with
the two cylinder-chambers at the two sides of the piston; a top-casing arranged
above the said delivery valve plate; and valves consisting each of a hemispherical
or calotte-like body, and of a weight secured to the lower side of said body,
substantially as described.
4. In a pump, the combination with an outer casing containing a cylinder, of a
suction-valve casing arranged above said cylinder; a delivery valve plate arranged
above said suction-valve casing; a partition wall arranged between the latter and
said delivery valve plate, and separating the pump-chambers communicating with
the two cylinder-chambers at the two sides of the piston; one of said chambers
having an extension containing a lever connected with the piston of said cylinder;
said piston being furnished with a hemp-packing, substantially as described.
5. In a pump the combination with a cylinder having a double-acting piston, of
a valve-casing forming a suction-chamber and two delivery-chambers, and of an
extension forming a chamber communicating with one of said delivery-chambers,
and with one of the cylinder-chambers; said extension containing a lever connected
with said piston; said lever being secured to a shaft having its bearings formed by
said extension, and projecting outwards at one side thereof; said projecting end
being passed through a stuffing-box, and provided with a lever-like handle, sub
stantially as described.
6. In a pump, the combination with two cylinders having each a single-acting
piston, of a valve-casing arranged between said cylinders, and carrying an air
vessel on its top; said valve-casing having valves consisting each of a hemispherica
or calotte-like body, and of a weight secured to the lower side of said body
substantially as described.
Dated this 6th day of November 1895.
WILHELM LEDERLE,
By Geo. H. Rayner,
37 Chancery Lane, London, Agent for the Applicant.