Improvements in Lubricating Pumps.
Year: 1899

page_text: Date of Application, 6th July, 1899-Accepted, 12th Aug., 1899
Improvements in Lubricating Pumps.
I, ALEXANDER FRIEDMANN, of Am Tabor 6, Vienna, in the Empire of Austria,
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 an improved lubricating pump. Oil pumps used for
lubricating high pressure chambers such as engine cylinders have not hitherto
effected an equal and sure lubrication as by the penetration of air or steam
into the piston chamber of the oil pump, the elastic gas is often compressed
without being capable of overcoming the counter-pressure, especially if the
gaseous volume present is not exceptionally small. With regard to the small
quantity of oil which cach stroke of the piston is intended to forward, the
presence of a very small gaseous volume is often sufficient to hinder the effect
of the pump.
In the improved oil pump herein described the piston chamber is very large
in proportion to the piston stroke as the gearing driving the piston and further
a rotary valve are arranged in the piston chamber, the so formed large gaseous
volume is deprived of its disadvantageous effect as an automatic ventilation of
the piston room is effected without a special arrangement being made as the
compressed air being eventually in the piston chamber passes out through the
oil inlet channel into the oil vessel at the commencement of the piston stroke
(suction stroke:)
The annexed drawing illustrates the invention, in which Fig. 1 shews the oil
pump in longitudinal section, Fig. 2 is a cross-section on the line A-B of Fig. 1,
Fig. 3 is a cross section on the line CD of Fig. 1 and Figs. 4 and 5 are details;
a is the oil vessel and b b the piston chamber. The vessel a and chamber b
are connected together by a channel n (see also Fig. 5); c is the plunger-piston
rendered tight by means of a stuffing box k; the plunger-piston extending into
the piston chamber is screwed to a sheet d. Perpendicularly to the piston ca
spindle his arranged also in the piston room which influences by an eccentric e
the plunger piston c and carries the worm wheel f which is driven by the worm
shaft which is rendered tight by means of the stuffing box 7. On the upper
end of the spindle is a valve m, provided with an opening 2 (Fig. 4) and
which fills the upper part of the piston chamber, oo is a channel leading from
the piston chamber to the consumption place. The action of the pump is as
follows:
By the rotation of the pulley (Fig. 3) the parts gf and h are turned and a
reciprocating movement is given to the plunger piston c by means of the
eccentric e and the sheave d. The spindle h carries at its upper end the valve m
which rotating with h at the entering of the plunger into the piston chamber
connects the latter with the oil channel o o', whilst at the outward movement of
the plunger it connects the channel n and consequently the oil vessel a with
the piston chamber.
Suppose that in the piston chamber b there is twice as much air as the piston

page_text: is pushing away, and in o o' there is a strong pressure to overcome (for instance
10 atmospheres). At the entering of the plunger the air is compressed to half
its volume, but the pressure is not sufficient to overcome the counter pressure at
the consumption place and consequently one of the valves arranged in the
conducto o may not be lifted. At the moment the plunger piston commences
its movement out of the piston chamber (suction stroke) the rotary valve connects
the vessel z with and the compressed air collected in the upper part of the
piston chamber escapes first through n into the oil vessel whilst by the further
outward movement of the plunger the oil enters into the piston chamber The
possibility of allowing the presence of a large gaseous volume by this auto-
matical ventilation allows as above described the movement of the worm gearing
driving the piston and the valve; as well as the valve itself in the piston room,
which has the advantage that these parts running in oil do not need any oiling
and moreover the stuffing boxes and k are easily accessible and can constantly
be controlled. The worm gearing could for instance be placed, in the oil vessel
where it would not need a special oiling, but then the stuffing boxes or at least
one of them would also lie in the vil of the oil vessel and if untight, oil would
enter from the piston chamber into the oil vessel without being observed.
As can be seen in Figs. 1 and 2 the plunger piston e the free end of which does
not pass into the piston room can be taken away by unscrewing it from the
sheave, without interfering with any other part of the pump. If the piston be
replaced by a larger or smaller one in order to obtain more or less oil at each
piston stroke, only the stuffing box-collar and the washer i have to be replaced:
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
1 claim is
1. An improved lubricating pump in which the worm gearing for actuating
the plunger piston c and the rotary valve are arranged in the piston chambersb
in such a manner that the said valve occupies the upper part of the piston
chamber.
2. In an improved lubricating pump as described in Claim 1 the arrangement
of a plunger piston whose free end does not pass into the piston chamber whilst
the end entering the piston chamber is detachably connected with the worm
gearing driving it so that the plunger piston can be removed without interfering
with any other part of the oiling pump.
Datod this fith day of July 1899.