Improvements relating to Steam-pumps.
Year: 1890

page_text: Date of Application, 10th Apr., 1890
Complete Specification Left, 10th Jan., 1891-Accepted, 21st Feb., 1891
.
PROVISIONAL SPECIFICATION.
Improvements relating to Steam-pumps.
1, PAUL MÜGEL, of St. Johann, Saarbrück, in the Empire of Germany, do
hereby declare the nature of this invention to be as follows:-
My invention relates to the valve-gear and cocks of direct-acting steam-pumps,
and to mechanism for automatically stopping the pump, when the water pressure
exceeds a given point and for starting it again.
In carrying out my invention I employ a regulating plate mounted loosely on a
shaft and which is at first operated by means of a pin on a lever actuated by cross-
pins on the piston rod, the movement of the plate being completed, so as to
effect a quick movement of the steam inlet cocks, when the piston is near the
end of its stroke, by an arm on the said shaft striking against a shoulder on the
regulating plate.
Each cock has its inlet and outlet passages arranged in different planes, there
being an inlet chamber and an outlet chamber in the casing placed in the respective
corresponding planes, which chambers communicate alternately with the plug of
the cock, the passages from the cylinder being arranged in the same hereinbefore
described planes.
The automatic stopping and starting mechanism consists mainly of a weighted
lever actuated by means of a membrane which is acted upon by the water-pressure
and thereby effects the movement of a pin which causes a pawl to enter a notch in
the regulating plate.
s A1 1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements relating to Steam-pumps.
1, PAUL MÜGEL, of St. Johann, Saarbrück, in the Empire of Germany, 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:
My invention relates to the valve-gear and cocks of direct-acting steam pumps,
and to mechanism for automatically stopping the pump when the water pressure
exceeds a given point and for starting it again.
In carrying out my invention I employ a regulating plate mounted loosely on a
shaft and which is at first operated by means of a pin or lug on a lever
actuated by cross-pins on the piston rod, the movement of the plate being completed,
so as to effect a quick movement of the steam inlet cocks, when the piston is near
the end of its stroke by an arm on the said shaft striking against a shoulder on the
regulating plate.
Each cock has its inlet and outlet passages arranged in different planes there
being an inlet chamber and an outlet chamber in the casing placed in the respective
corresponding planes, which chambers communicate alternately with the plug of
the cock, the passages from the cylinder being arranged in the same hereinbefore
described planes.
The automatic stopping and starting mechanism consists mainly of a weighted
lever actuated by means of a membrane which is acted upon by the water-pressure
and thereby effects the movement of a pin which causes a pawl to enter a notch in
the regulating plate.

page_text: Figures 1 and 2 are views of the pump seen from different sides.
Figure 3 is a cross section.
Figure 4 is a longitudinal section of the working cylinder.
Figure 5 is a section on the line a x of Figure 4.
Figure 6 is a section on the line y y Figure 5.
Figure 7 is a section on line z Figure 5 and
Figure 8 is a view of the conical body of the cock.
According to this invention the valve gear is constructed with steam inlet cocks
in connection with its link motion which effects a quick movement of the steam
inlet cocks at a certain point near the end of the stroke of the piston so as to reverse
the stroke.
A cross-pin Z, on the common piston rod K of the working cylinder and the
pump cylinder, moves a forked lever U, which by means of a lug or projection
strikes against the contact surface C or C' of the loose regulating plate B, and
operates the connecting rod G and the cock or valve D. A second lug or pro-
jection V V on the forked lever U strikes against a weighted lever-arm H fixed
on the shaft W and causes it to tip over. The tipping of the lever H in connection
with the shaft W and lever E which strikes against the surfaces C C' of the
regulating plate causes the movement of the reversing mechanism which has already
been commenced to be quickly completed.
The connecting-rod from-the-regulating plate effects the reversing of the cock D
or other valve.
The pump can be actuated either by steam, water, or compressed air and can be
used for any pumping operation.
In the construction shewn in the drawings the reversing mechanism for the
working cylinder consists of a cock D of peculiar formation ordinary valves being
employed for the pump cylinder F. It is obvious that the pump cylinder could
also be provided with a cock-valve which could be actuated together with that for
the working cylinder from the same regulating plate B.
Referring to Figures 4 to 8 the cock consists of a casing or shell L a body O and
a hollow cone M arranged between the body and the casing.
The body O has two passages or ways p and q passing at right angles to each
other and arranged in different planes, one for the inlet and the other for the outlet
of the steam, compressed air, or water etc.
The hollow cone M is provided with four passages in each plane of the ways P, 7,
the two upper passages communicate with the two steam passages in the cylinders
and the two others with a chamber or inside the casing into which open
both the inlet and outlet pipes a and d respectively. The channels c and c¹ leading
into the cylinders are made wide enough to cover the two passages in the cock so
as to alternately receive or discharge either steam, water or air according to the
position of the cock.
An automatic stop mechanism actuated by water-pressure stops the engine when
the pressure reaches a certain point and just at the moment the tipping movement
of the lever begins.
The two pistons in the cylinders F and F work on a common piston rod K
provided with a square block S having pins Z and Z with friction rollers R
and R. The said friction rollers R and R' work in a slot in the forked lever U
which is loose on the rocking shaft W and the lever U in consequence of the to and
fro movement of the piston rod receives a rocking motion.
The lever U is provided with two bosses by means of which the lever H
which is provided with a weight Q and fixed on the rocking shaft W is operated
and causes the rocking shaft W to turn.
As soon as the fixed lever H has been moved to the vertical position as shewn in
Figures 2 and 3 it quickly falls over and at the same time turns the rocking shaft W
as far as the buffer X will allow the weight Q to fall. The lever E thereby passes

page_text: underneath the lug or projection b of the forked lever U until it bears against the
contact surface C or C¹ and completes the movement; the extent of the movement
can be regulated by adjusting the buffers X X.
As the regulating plate B is moved by the lug on the lever U beyond its vertical
position before the lever H reaches the vertical position the latter will at the
moment of leaving the vertical position at first move freely and then, after it has
attained a certain speed, strike against the contact surfaces C or C₁ of the
regulating plate B and thereby effect the rapid completion of the stroke.
The lug or projection & is intended by starting the movement of the regulating
plate B to lessen the shock produced by the tipping lever H coming against the
contact surfaces C or C of the said reversing plate B. Finally the lug or pro-
jection b serves, when steam pressure is used, to cut off steam at a certain point of
the piston stroke in order that the steam shall work expansively and also serves to
close the steam exhaust shortly before the piston reaches the end of its stroke in
order to form a steam cushion at the back of the piston to prevent shocks.
The construction of the regulating cock is shewn in Figures 4 to 8.
In Figures 4, 6 and 7 the cock is shewn in a position to allow the steam, water
or compressed air to pass from the inlet pipe d of the chamber to the passage or
way p and thence through the passage c into the cylinder behind the left hand side
of the piston which would be caused to move in the direction of the arrow; at the
same time the exhaust steam, water or air escapes from the right hand side of the
piston through the channel c', the passage q, chamber and the exhaust pipe a.
Upon the cock being now turned a quarter of a revolution the steam, water or air
from the chamber is allowed to pass through the passage p into the channel c¹ and
thence into the cylinder behind the right hand side of the piston which latter is
driven in the opposite direction to the arrow while at the same time the exhaust is
opened from the channel c through the passage q, chamber r¹ and the exhaust
pipe a.
The mechanism for stopping the pump when a certain pressure is attained in the
reservoir is actuated by a membrane f, covering a vessel P suitably placed near the
pump. The vessel P is in direct connection with the reservoir by means of a
pipe j. When the pressure in the reservoir exceeds a given degree the membrane
in the vessel P presses the pin t upwards, lifts the weighted lever W and weight N
and prevents by means of the lever W₁ the further movement or rather the tipping
movement of the lever H and thereby the reversing of the engine. The stopping
mechanism can also be so made that the lever W₁ of the lever W, shall cause a
pawl to engage in a recess in the regulating plate and stop the movement of the
latter. In this arrangement however the position of the contact surfaces C C¹ of
the regulating plate B as well as that of the lug or projection must be calculated in
such a way that when stopping the regulating plate B the inlet for the steam shall
have already been closed while there shall exist a small opening for the exhaust.
The latter must therefore have the lead to some extent against the inlet. When
the pressure in the reservoir is lowered in order to remove the stop, the lever H
with its weight Q completes the reversing already commenced and re-starts, the
engine. By adjusting the weight Q the pressure in the reservoir can be regulated
according to requirement.
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. The improved valve gear for direct acting pumps comprising mechanism for
operating the reversing plate which is first moved by a block mounted on cross pins
on the piston rod in conjunction with a lug or projection on a forked lever the
movement being continued by a counterweighted lever coming against contact
surfaces on the forked lever the movement being rapidly completed by an arm
striking against a shoulder or surface on the regulating plate, substantially as
hereinbefore described.

page_text: 2. A cock comprising the following combination of parts
(a) The inlet and outlet channels of different cross sections in the body of the
plug.
(b) A solid valve casing which is provided in each plane of the channel with
four openings corresponding with the two positions of the plug of the
valve.
(c) Two chambers in the valve casing into which lead two corresponding
openings from the valve plug as well as the inlet and outlet pipes.
(d) Two cylinder channels arranged in the same planes as the openings in the
cock plugs.
3. The combination with mechanism such as that referred to in Claim 1 of an
automatic stopping and starting device operated by the pressure in the water
reservoir and comprising an elastic membrane which by the movement of a pin
arranged in connection therewith causes a stop lever to enter or leave a recess in
the regulating plate or to act to retain the counter-weighted lever, substantially as
hereinbefore described.
4. The improvements in the valve gear and cocks of direct-acting steam pumps
as hereinbefore described, and illustrated in the accompanying drawing.
Tinted the 10th love of Januar 1901
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.