Improvements in Pumps with Oscillating Pistons.
Year: 1896

page_text: Date of Application, 20th Jan., 1896
Complete Specification Left, 14th Oct., 1896-Accepted, 12th Dec., 1898
Improvements in Pumps with Oscillating Pistons.
I, AXEL FREDRIK ABRAHAMSON-ROXENDORFF of 73 Avenue du Bois de
Boulogne, Paris in the Republic of France, Engineer, do hereby declare the
nature of this invention to be as follows:-
The present invention relates to pumps with oscillating pistons in which in a
cylinder connected by suitable passages with a suction pipe and a pressure pipe two
pistons are disposed in radial direction of an oscillating shaft. The one of these
pistons is keyed on the shaft and acts as suction and pressure piston, whereas the
other piston serves as distributing device and is adapted to swing around the
shaft.
The two pistons divide the cylinder or pump barrel in two chambers, which
corresponding to the direction of the movement of the oscillating suction and
pressure piston are alternately the suction and pressure chambers. The second
piston which serves as distributing device is according to the direction of the
movement of the suction piston moved by the pressure of the fluid into one or the
other of its end positions where it is arrested by a stop and in these positions it
establishes the communication of the suction chamber with the suction pipe and
of the pressure chamber wtih the pressure pipe.
The invention is shown in the annexed drawings in different modifications.
Fig. 1. is a cross section of the cylinder with suction and pressure pipes arranged
on one side of the same, the distributing piston being guided on the nave of the
shaft.
Fig. 2 is a similar section showing the distributing piston guided on a partition
arranged within the cylinder.
Figs. 3 to 6. are sections representing the pump with suction and pressure pipes
arranged on opposite sides.
Fig. 7 shows in section a hollow distributing piston being provided with valves
establishing a communication of the interual space of the piston with the chamber
of the cylinder.
In all the said figures the movement of the distributing piston a is shown as being
arrested by a stop r arranged in the front lid of the cylinder and which stop enters
into a groover of the piston.
In the arrangement of Figure 1 it is assumed that the shaft w moves the suction
and pressure piston b in the direction of the arrow the chamber m is in this case
the suction chamber and chamber n the pressure chamber. The distributing
piston a is provided with openings c and d it swings on the nave of the piston
and is by the pressure of the fluid in the chamber n pushed to its extreme position
toward the chamber m.. The opening of the distributing piston has in this
position established the communication of the suction pipe o through the port 9
with the chamber m.
In Figure 2 the suction and pressure piston is shown as being moved in the
direction of arrow k, that is in contrary direction as in Fig. 1, whereby the
distributing piston is pushed to the extreme opposite position. The opening d
now establishes the communication between the suction pipe o and chamber n
through the port i, which during the movement of the suction and pressure piston

page_text: is the suction chamber, whilst the fluid in the chamber m is pressed through the
-opening c and port h into the pressure pipes.
Fig. 2 moreover shows a modified arrangement of the interior guide of the
distributing piston which in this ease consists in a curved partition & arranged
between the cylinder cover and bottom.
In Figs. 1 and 2, the suction and pressure pipes are situated on the same side of
the cylinder. They may however be disposed on opposite sides as represented
in Figs. 4 and 5. In this case the suction pipe o ends in channel o' communicating
with the interior of the cylinder by ports e¹ and the distributing piston having
corresponding openings e and which alternately establish and cut off the
communication of the suction pipe with the chambers m and n.
The fluid is pressed as before alternately through openings d and o into the
pressure pipe p.
This arrangement may be reversed that is the suction pipe may be disposed to
open directly into the cylinder and the pressure pipe connected with a channel
leading to the opposite side of the cylinder as shown in Figs. 5 and 6. p¹ is the
channel in which ends the pressure pipe and which communicates by ports f¹ and e¹
with the interior of the cylinder. The distributing piston a in its two end
positions alternately closes and opens these ports. The openings of the
distributing piston are arranged as channels c and d which alternately communicate
with suction pipe o and of which e also communicates with chamber m, and d with
chamber n.
In the arrangement of Fig. 7 the distributing piston a is represented as being
hollow and provided with a single opening a¹ instead of the openings c and d and
with valves x and y which alternately admit the fluid from the suction pipe o into
the chambers n and m. The pressure pipe p is shown in the figure to end in
channels p' conducted around the cylinder wall and communicating by ports e', f
with the interior of the cylinder. It is evident and requires no further
explanation that this arrangement of the channels and ports can also be
applied in the construction described with reference to Figs. 3 4 5 and 6 and
vice versa.
It also wants no special explanation that the machine described as pump may
without any change of the mechanical parts be used as motor. If a fluid under
pressure is introduced by the pressure pipe p through port h into the chamber m
(see Fig. 2) the piston 6 will be driven in the direction of arrow 1 drawn in dotted
lines until it strikes the distributing piston a and will push this into its other
extreme position shown in Fig. 1. In this position the pressure fluid is made to
pass through port into the chamber n and will drive the piston in opposite
direction. The piston a so imparts to the shaft an oscillating movement.
Dated this 20th day of January 1896.
umps with Oscillating Pistons.
I, AXEL FREDRIK ABRAHAMSON-ROXENDORFF, of 73 Avenue du Bois du 45
Boulogne, Paris, in the Republic of France, 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 :-
The present invention relates to pumps with; oscillating pistons in which in a
cylinder connected by suitable passages with a suction pipe andra pressure pipe 50

page_text: these pistons is keyed on the shaft and acts as suction and pressure piston,
whereas the other piston serves as distributing device and is adapted to swing
around the shaft.
The two pistons divide the cylinder or pump barrel in two chambers, which
corresponding to the direction of the movement of the oscillating suction and
pressure piston are alternately the suction and pressure chambers. The second
piston which serves as distributing device is according to the direction of the
movement of the suction piston moved by the pressure of the fluid into one or the
other of its end positions where it is arrested by a stop and in these positions it
establishes the communication of the suction chamber with the suction pipe and of
the pressure chamber with the pressure pipe.
The invention is shown on the drawings in different modifications, filed with my
Provisional Specification.
Fig. 1 is a cross section of the cylinder with suction and pressure pipes arranged
on one side of the same the distributing piston being guided on the nave of the
shaft.
Fig. 2 is a similar section showing the distributing piston guided on a partition
arranged within the cylinder.
Figs. 3 to 6 are sections representing the pump with suction and pressure pipes.
arranged on opposite sides.
Fig. 7 shows in section a hollow distributing piston being provided with valves
establishing a communication of the internal space of the piston with the chambers.
of the cylinder.
In all the said figures the movement of the distributing piston a is shown as
being arrested by a stop r arranged in the front lid of the cylinder and which stop
enters into a groover of the piston.
In the arrangement of Fig. 1 it is assumed that the shaft w moves the suction
and pressure piston 6 in the direction of the arrow 1, the chamber m is in this case
the suction chamber and chamber n the pressure chamber. The distributing
piston a is provided with openings c and d, it swings on the nave of the piston b
and is by the pressure of the fluid in the chamber n pushed to its extreme position
towards the chamber m. The opening of the distributing piston has in this
position established the communication of the suction pipe o through the port g
with the chamber m.
In Fig. 2 the suction and pressure piston is shown as being moved in the-
direction of arrow k, that is in contrary direction as in Fig. 1, whereby the
distributing piston is pushed to the extreme opposite position. The opening d
now establishes the communication between the suction pipe o and chamber n
through the port i, which during this movement of the suction and pressure piston
is the suction chamber, whilst the fluid in the chamber m is pressed through the
opening e and port h into the pressure pipes.
Fig. 2 moreover shows a modified arrangement of the interior guide of the
distributing piston which in this case consists in a curved partitions arranged.
between the cylinder cover and bottom.
In Figs. 1 and 2 the suction and pressure pipes are situated on the same side of
the cylinder. They may however be disposed on opposite sides as represented
in Figs. 4 and 5. In this case the suction pipe o ends in channel o¹ communicating
with the interior of the cylinder by ports e and f the distributing piston baving
corresponding openings e and f which alternately establish and cut off the
communication of the suction pipe with the chambers m and n. The fluid is
pressed as before alternately through openings d and c into the pressure pipe p.
This arrangement may be reversed, that is the suction pipe may be disposed to
open directly into the cylinder and the pressure pipe connected with a channel
leading to the opposite side of the cylinder, as shown in Figs. 5 and 6. p¹ is the
channel in which ends the pressure pipe and which communicates by ports fi
and with the interior of the cylinder. The distributing piston a in its two end

page_text: positions alternately closes and opens these ports. The openings of the dis-
tributing piston are arranged as channels c and d Figs. 5 and 6 which alternately
communicate with suction pipe o, and of which c also communicates with chamber m
and d with chamber n.
In the arrangement of Fig. 7 the distributing piston a is represented as being
hollow, and provided with a single opening a' instead of the openings c and d and
with valves and y which alternately admit the fluid from the suction pipe o
into the chambers n and m. The pressure pipe p is shown in the figure to end in
channels p' conducted around the cylinder wall and communicating by ports el f
with the interior of the cylinder. It is evident and requires no further
explanation that this arrangement of the channels and ports can also be
applied in the construction described with reference to Figs. 3, 4, 5, and 6 and
vice versa.
It also wants no special explanation that the machine described as a pump may
without any change of the mechanical parts be used as motor. If a fluid under
pressure is introduced by the pressure pipe p through port h into the chamber m
(see Fig. 2) the piston 6 will be driven in the direction of arrow until it strikes
the distributing piston a and will push this into its other extreme position shown
in Fig. 1. In this position the pressure fluid is made to pass through port h into
the chamber n and will drive the piston in opposite direction. The piston a so
imparts to the shaft an oscillating movement.
Having now particularly described and ascertained the nature of this said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In a pump with oscillating pistons the combination with the suction and
pressure piston keyed on the oscillating shaft, of a distributing piston free to swing
around the shaft between two end positions, a cylinder divided by the two pistons
in two chambers, suction and pressure pipes and passages arranged to connect one
chamber with the suction pipe and the other chamber with the pressure pipe and
to reverse these connections when the distributing piston is shifted from one end
position to the other, essentially as described.
2. In a pump with oscillating pistons the combination with the suction and
pressure piston 6 keyed on the oscillating shaft, of a distributing piston a free to
swing around the shaft between two end positions, a cylinder divided by the
pistons b and a in two chambers n and m, a suction pipe o and a pressure pipe p
passage a¹ in the piston a opening continuously into the suction pipe o, passages ple
and pf alternately connecting the pressure pipe p with the chambers m and n and
two valves and y alternately connecting the passage a' with the chambers m and n,
essentially as described.
D 19th In- of October 1806
HERBERT HADDAN & Co.,
18 Buckingham Street, Strand, London, W.C.,
Agents for Apд icant.