Year: 1886

page_text: Date of Application, 9th Sept., 1886.
Complete Left, 9th June, 1887.
Complete Accepted, 12th July, 1887.
I THEODORE DERICHS of Brussels Manufacturer do hereby declare the nature of
my said Invention to be as follows:-
This Invention relates to improvements in the construction of double acting pumps
with oscillating pistons and has for its object facilitating putting the parts of such
pumps together and reducing the wear as far as possible. In a cylindrical case a plate
is fixed which carries the suction valves and to this plate is connected by a jointed or
hinged connection a rectangular plate carrying the delivery valves and parallel to the
axis of the cylinder being so arranged as to be capable of partaking of a rocking or
oscillating motion. With this object the parts are constructed as follows: In the
under part of the cylindrical pump case or body and parallel to the axis a plate is
screwed or otherwise rigidly fixed. At each side of this plate there is a suction valve
preferably having a stem or rod and working in guides and in the form of a segment
of a sphere. At the middle part there is provided on this plate a trough shaped cavity
for the reception of the shaft or axis of the piston which shaft is introduced from the
side. These two parts are fitted closely together so as to cut off all communication
between the right and left hand chambers. The piston is composed of a strong
rectangular plate firmly fixed to the aforesaid shaft. The four sides thereof present
Ushaped recesses or grooves for the reception of packing pieces of suitable material
which are pressed against the surface of the cylinder by means of suitable springs
placed under them in the said recesses or grooves. On each side this piston is provided
with seats for the forcing or delivery valves which with their stems work in suitable
guides attached to the piston. The piston shaft projects on one or both sides beyond
the cylinder cover and on the projecting end or ends of the said shaft are applied the
lever or levers for working the pump. By causing this lever to rock or oscillate to
and fro the piston is also caused to oscillate and as liquid is drawn in through one of
the suction valves it is forced out through the forcing or delivery valve on the opposite
side.
Dated this 9th day of Santambo, 1904
J. HENRY JOHNSON,
Agent for the said Th. Derichs.

page_text: Improvements in Pumps.
1 THEODORE DERICHS of Brussels (31 Rue Pierre van Humbeck Motenbeck)
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 relates to pumps in which an oscillating piston carrying the delivery 5
valves is employed and consists in an improved construction and combination of the
parts as hereinafter described whereby amongst other advantages the work of putting
the parts together is greatly facilitated and the wear and friction are reduced to a
minimum.
And in order that my said Invention may be fully understood I shall now proceed
more particularly to describe the same and for that purpose shall refer to the several
figures on the annexed sheet of drawings, the same letters of reference indicating
corresponding parts in all the figures.
Figure 1 of the accompanying drawings represents a transverse section of a pump
constructed according to this Invention and Figure 2 is a longitudinal section of
the same.
This pump is provided with a cylindrical case A in the lower part of which a
horizontal plate or partition P is secured by bolts 5. This plate is formed with a
groove or recess Q for the reception of suitable packing material for the purpose of
preventing leakage between the edges of the plate and the sides of the case.
Underneath the plate P there are placed arms 2 forming guides for the stems of two
suction valves R R' in the form of a segment or portion of a sphere and at the middle
part of the said plate there is provided a piece of metal or boss M presenting a trough
shaped cavity forming a socket in which a corresponding shaped part N on the
oscillating piston B is fitted being fixed on a rocking shaft or axis D which is
introduced from one side of the case. A jointed but watertight connection is thus
formed between the oscillating piston and the fixed plate, two or more longitudinal
grooves or recesses Q₁ figure 1 being provided in the part M for the reception of
packing material preventing leakage between the piston and the plate or partition at
the centre the spaces beneath the piston B on either side of the axis D being thus
completely separated.
The oscillating piston B is formed by a rectangular plate provided on its underside
with the sleeve or boss N fixed on the shaft D and cast in one with or otherwise
attached to the piston. The four sides or edges of the piston present grooves or recesses
for the reception of packing bars or pieces K of metal leather or other suitable
material which are pressed outwards against the surface of the case by springs as
indicated in Figure 1. A simple and effectual packing is thus provided for the piston
and the friction at the same time reduced to a minimum. The piston is provided on
each side of its axis with delivery valves F F¹ provided with stems working in
guides G and H.

page_text: The shaft D by which motion is imparted to the piston projects through the cover S
of the case passing through a stuffing box in the said cover and being provided
externally with a suitably squared part (Figure 2) for the reception of the lever by
which the pump is worked.
In the case of large pumps the shaft may project through both sides of the case
and be provided with a lever at each end. The pump is operated by imparting a
rocking or reciprocating motion to the lever in the usual manner so that by moving
the lever and piston B figure 1 from left to right for example liquid is drawn up or in
through the left hand suction valve R in the plate P and is forced out through the
right hand delivery valve F¹ in the piston B. When the lever and piston are moved
in the opposite direction or from right to left the liquid is drawn in through the
valve Rand capelled through the valve F.
The case or body of the pump is made of cast iron plated internally with brass or
copper to prevent rusting of the iron. The shaft D preferably made of steel is
entirely encased in bronze or gun metal the piston and valves being preferably made
entirely of this material but of course any other suitable metal or materials can be
employed as may be deemed most expedient.
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 :-
:
:-
First In a double acting pump the combination of a plate or partition fixed in
the case with a piston carrying the delivery valves and connected to a shaft projecting
through one or both sides of the case the said piston being capable of oscillating on
the axis of the cylindrical case by means of a jointed connected uniting it with the
said plate substantially as hereinbefore described with reference to the accompanying
drawing.
Second-The jointed connection between the piston and partition plate referred
to in the preceding claim formed by the socket or trough shaped part M on the said
plate for the reception of the shaft operating the piston the said shaft being introduced
longitudinally by sliding it in the direction of its axis in combination with means for
preventing leakage at the joint substantially as herein before described and illustrated
in the accompanying drawings.
قيم
T
1005