Pump System. Page: 4 of 5
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the piston 18 thereof is making its suction
stroke and is compressed and pumped into
the reservoir 22. By thus drawing the air
through the water in the radiator, it will
6 be washed free of all grit before going to
the pump cylinder, and- it is also cooled.
The pump cylinder 12 obtains its air supply
from the reservoir 22 and discharges into
the reservoir 25..
10 A. device is provided foi' automatically
stopping the operation of the engine 10
when a predetermined pressure has been
pumped into the reservoir 25. This device
comprises a flexible-diaphragm 38 mounted
15 in cashig 39, and exposed on one side to the
pressure in the reservoir 25, the bitter being
connected to the casing, on one side of. the
diaphragm, by a pipe 40.. In the casing, on
the other side of the diaphragm, and en-
20 gaging the latter, is a coiled spring 41. To
the diaphragm is connected a stem 42 which
carries a. switch 43, the latter operating be-
tween two contacts 44 interposed in the ig-.
nition circuit45 of the engine 10, and con-
25 trolling said' circuit. The. spring 41 op-
poses the pressure in the reservoir 25 against
the diaphragm, and flexes the latter in a di-
rection to move theswitch 43 so as to close
the ignition circuit when the reservoir pres-
30 sure drops below the normal. When the
pressure in the reservoir 25 rises above the
normal it becomes sufficiently great to over-
come the tension of the sprmi n;, the dia-
phragnm is-flexed, and it moves tle. sten'42
15 in a direction to break the ignition circuit.
When the pressure ini the reservoir drops
below the normal, the spring flexes the dia-
phragm in the opposite direction, and the1
switch.engages the cont acts 44 to again close
40 the ignition circuit. A starting device for
the engine 10 is also provided. This device
operates autommatically by the compreged
air supply, through the .following mieut:
A valve casing 46 is connected by a pIipe-47
45 to the low pressure reservoir 22, and has
two oppositely extending braiiches to wich
are connected pipes 48 and 49 respectively.
The pipe 48 is connected to the pump cylinm
der 12, and the pipe 49 is commiected to th
50 pump cylinder 13. flhe outlet ends of the
pipes 48 and 49 are. provided with check
valves. 50. The valve 51 operatinggin the
casing 46 has a seat 'in said casing, which
seat is located so that-the valve controls the
55 flow of air into the casing from the reser--
voir 22 through the-pipe 47. When the
valve 51 is open, air flows from the reservoir r
22 through the pipe 47 into the valve casing
40, and thence passes by the way of the
60 pipes 48' and 49 into the pump cylinders
12 and 13. The casing 46 is connected by
a tube 52 to a casing 53 containing a flexible
diaphragm 54. The casing 53 is connected.
by a pipe 55 to the reservoir 25 so that one
65 side of the diaphragm will be exposed to thepressure in said reservoir. On the other
side of the diaphragm, the casing contains
a coiled spring 50 which engages the dia-
phragin and opposes flexion of the dia-
phragnA by the reservoir pressure there: 7G
against. To that side of the diaphragm
which is engaged by the spring,-is connected
the stem'57 of the valve 51, said stem pass-
ing through the tube 52, and extending. into
the casing 40. -- 75
The spring 50 is adjusted so that it bal-
ances the pressure in the reservoir, when
said pressure is normal, and the valve stem
57 is so -arranged that the valve 51 is then
closed, thus shutting off the pressure in the 80
reservoir 22 from the. pump cylinders 12
and 13. Now, if the pressure in the reser-
voir 25 drops' below normal, the spring 5G
is permitted to expand, and thereby flex the
diaphragm 54 in a direction to open the 85
valve 51 whereupon compressed air from the
reservoir .22 flows through the pipe 47, and
passes through the pipes 48 and 49 intothe
pump cylinders 12 and 13, and is exerted
against .the pistons therein to give the crank 90
shaft a. turn, and thus 'start the engine 10.
The operations as follows:-When the
pressure in. the reservoir rises, above the
predetermined point the valve 51 closes, and
at. the. same time the ignition circuit is 15
broken by the device already described, thus
causing the engine 10 to stop. The back
pressure from the reservoir 22 will then fill
the pump cylinder 12 through. the pipe 28,
and force the piston 15 back to the position 100
it occdies at the end of thesuction stroke,
unless it is already 'in this position. This
movement of the piston moves the piston
18 in its cylinder 13 in the'opposite direction
by reason of the fact that the cranks 17 and 105
20 are set 1800 apart, so that said piston 18
is now in the position it occupies at the
end .of its compression stroke. The mo-
nientum of the fly wheel 21 is added to the
back pressure, and assists to move the pis-. 110
tons as stated. The parts are now in a posi-
tion for automatically startino- the engine
10, the operation being as folrows:-WThen
the pressure in the reservoir 25 drops below
the predetermined point, the ignition cir- .115
cuit 45 is closed as already described, and
the valve 51 opens, and lets compressed air
from the reservoir 22 pass into the pump .
cylinders 12. and 13. B1y reason of the
greater area of the piston 18, said piston is 120
forced rearwardly in its cylinder, thereby
rotating the shaft 11 to start the engine 10..
When the reservoir 25 has again been
pumped to: the desired'pressure, the engine
automatically stops, and the pump pistons 125
again come into starting- position as already
described.
In order that the engine -may be. started
manually 'if necessary, or desired,, there is
provided an ordinary starting crank-58 for 1300
S998,717
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Reference the current page of this Patent.
Read, William K. Pump System., patent, July 25, 1911; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth514323/m1/4/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.