Improvements in Feed Pumps for Petroleum Engines.
Year: 1891

page_text: Date of Application, 14th Nov., 1891
Complete Specification Left, 6th Aug., 1892-Accepted, 10th Sept., 1892
PROVISIONAL SPECIFICATION.
Improvements in Feed Pumps for Petroleum Engines.
I JAMES YATE JOHNSON of 47 Lincoln's Inn Fields in the County of
Middlesex Gentleman do hereby declare the nature of this invention, which has
been communicated to me from abroad by Carl Pieper, of Berlin, Kingdom of
Prussia, Patent Agent, to be as follows:-
This invention relates to feed-pumps for petroleum-engines, and its object is to
prevent leakage of petroleum through the packing of the plunger of the pump
and through the valves of the latter.
For this purpose glycerine, or any other suitable liquid heavier than petroleum
and incapable of mixing or combining therewith, is introduced into the cylinder
or chamber of the pump, and the plunger and its stuffing-box or packing are
arranged in such manner that the latter will be below the level of the glycerine.
Under these conditions the glycerine coming in contact with the plunger, will
serve to lubricate the same and also to keep the packing soft and in proper state to
produce complete tightness.
Moreover, the ordinary self acting valves are replaced by a slide-valve, and
both, the plunger and the slide-valve are actuated by means of a cam-disk, which
is so constructed that it moves the plunger while the valve is at rest, and shifts the
valve while the plunger is in repose.
Dated the 14th day of Nanambor 1801
J. H. JOHNSON & Co.,
Agents.
COMPLETE SPECIFICATION.
Improvements in Feed Pumps for Petroleum Engines.
I JAMES YATE JOHNSON of 47 Lincoln's Inn Fields in the County of
Middlesex, Gentleman do hereby declare the nature of this invention (which has
been communicated to me from abroad by Carl Pieper of Berlin, Kingdom of
Prussia, Patent Agent) 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 feed-pumps for petroleum-engines, and its object is to
prevent leakage of petroleum through the packing of the plunger of the pump
and through the valves of the latter.
For this purpose glycerine or any other suitable liquid heavier than petroleum
and incapable of mixing or combining therewith, is introduced into the cylinder
or chamber of the pump, and the plunger and its stuffing box or packing are
arranged in such manner that the latter will be below the level of the glycerine.
Under these conditions the glycerine coming in contact with the plunger, will
serve to lubricate the same and also to keep the packing soft and in proper state
to produce complete tightness.
Moreover, the ordinary self-acting valves are replaced by a slide-valve, and both,
the plunger and the slide-valve are actuated by means of a cam-disk, which is so
constructed that it moves the plunger while the valve is at rest, and shifts the
valve while the plunger is inactive.
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-
In the accompanying drawing A is the body of the pump, B the plunger, C the
slide-valve, D the cylinder or chamber for the reception of the glycerine, F the
cam-disk actuating the slide-valve and plunger, G a lever provided with roller
for transmitting the excentric motions of the cam-disk to the plunger, and H.
D

page_text: double-armed lever, pivoted at u, actuating the slide-valve C. The levers G and H
are held against the cam-disk by springs which are not shown in the drawing.
The cam-disk F is so shaped that parts of it, x- and w―r, are concentric, and
parts xw, and -z excentric.
In the position as shown in the drawing, the outlet port a is connected to the
port b, by the small channel m, in the slide-valve C. On the cam-disk F being
rotated in the direction of the arrow-heads, the roller g and consequently the
lever G and plunger B are raised by the excentric portion w-a of the disk causing
a small quantity of petroleum floating on the glycerine in the chamber D to be
forced through the port into the outlet port a. Whilst this takes place the
roller h fixed on lever H actuating the slide-valve C presses against the concentric
portion of the cam-disk, and is therefore at rest. As soon now, as roller g
I comes to the point e on the cam-disk its upward motion is arrested, whilst the
roller and lever H move to the left on the excentric portion - of the disk,
shifting the valve C so that the channel m now connects the inlet port o and port b.
The roller having now arrived at the concentric portion -w of the disk, the
slide-valve C and lever H are at rest, whilst the roller g and consequently lever G
and plunger B sink on the excentric portion -, causing a small quantity of
petroleum to be drawn into the chamber D through the inlet port o, and channel m.
The plunger is then at rest, whilst the slide-valve is being shifted, which in its
turn then remains inactive whilst the plunger is being forced upwards.
From the above it will be seen, that the plunger is always at rest, when the
slide-valve is in motion and vice-versa.
The stroke of the plunger B can be regulated by the screw S attached to
lever G and bearing against the fixed projection T, in such a manner, that the
distance of roller y from the concentric surface v-w of the disk is more or less
according to the extent S is screwed down. The glycerine in the chamber D is
always in contact with the plunger B through the channel i bored in the packing
and serves to lubricate the same.
The leather collars M, which in other constructions have always been subject to
the action of the petroleum and have in consequence even when specially prepared
soon become hard and brittle, and allowed the petroleum to work through, are
here entirely under the glycerine and are kept soft and durable by the same.
Petroleum being lighter than glycerine naturally floats on the same and does not
mix intimately with it.
Having now fully described and ascertained the nature of my invention and in
what manner the same is to be performed, I declare that what I claim is :-
1.) In a feed-pump for petroleum motors, the use of glycerine in the petroleum
chamber for the purpose of preventing leakage of the petroleum through the
packing of the plunger of the pump and through the valves of the latter, substan-
tially as herein described.
2.) The combination in a feed-pump for petroleum motors having a glycerine
chamber containing glycerine for the purpose set forth in Claim 1), of a cam-disk
and a slide-valve lever and plunger lever both actuated alternately by the cam-disk
in such a manner that the one will not be moved until the other is at rest in one
of its end positions and vice-versa, substantially as herein described with reference
to the accompanying drawing.
1
J
1003
J. H. JOHNSON & Co.,
Agents.