Pump Page: 3 of 4
[1], 3 p. : ill. ; 23 cm.View a full description of this patent.
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731,892
through the instrumentality of the aforesaid
crank and friction-roller.
The discharge-pipe 32 is bolted or other-
wise secured at its lower end to a flange ex-
5 teriorly surrounding a discharge-opening 36,
formed in the front end of the pump-barrel,
and is provided at its upper end with a down-
wardly-curved discharge-nozzle 37, threaded
thereto, so as to be readily removable there-
1o from for the substitution of a hose-nozzle, if
desired, said nozzle having shoulder 38, on
which the bail of a bucket or like receptacle
may be hung for suspending the bucket into
position to receive water from the spout. A
15 packing-washer 39, of leather or other suit-
able material, forms a water-tight joint be-
tween the nozzle and pump-barrel.
The duplex piston is adapted to be applied
to and removed from the piston-chamber 2
20 through the upper open end of said piston-
chamber closed by the head or cap 5, while
the crank-arm 29 and the friction-roller 26
attached thereto are adapted to be inserted
and withdrawn through the discharge-open-
25 ing 36 when the discharge-pipe 32 is removed.
By this construction it will be seen that ready
access is afforded to the interior parts of the
pump for connecting them up and for re-
moving them for repairs or other purposes.
30 In priming the pump for operation the
cover 7 is swung outward to expose the air-
discharge opening 6, the handle .33 rapidly
operated up and down to reciprocate the du-
plex piston, and a suitable form of imple-
35 ment, such as a rod, inserted down through
the opening 6 to hold the valve 21' off its
- seat, by which the air contained within the
pump-barrel is caused to discharge and wa-
ter to be drawn upwardly through the branch
40 passage 10 to take the place of the expelled
air, this operation being continued until the
barrel is filled with water and all the air has
been discharged, when the cover 7 is again
closed to seal the opening 6. By the use of
45 the opening 6 and its closure 7 I am enabled
to employ a duplex piston and have both pis-
ton members operate to draw in and expel'
water.
Heretofore, so far as I am aware, it has
5o been found impracticable to employ vertical
pumps of this character, for the reason that
a column of air at all times occupies the up-
per portion of the piston-chamber and can-
not be expelled by the upper piston member
55 on account of the resistance by the water
drawn in by the lower piston member to the
discharge of the air through the discharge-
pipe, and, further, because of the fact that
immediately upon the cessation of the down-
6o ward movement of the upper piston member
the air drawn down by it being lighter than
the water below will again rise to the upper:
portion of the piston-chamber and form an
air-cushion or seal therein, thus preventing
65 water from flowing into the upper portion of
the piston-chamber through the passage com-
municating therewith, so that the pump whenoperated will expel no more water than an
ordinary single-acting pump, one of the pis-
ton members (the upper one) being rendered 70
practically dead or useless by the aforemen-
tioned air-cushion. My construction obvi-
ates this difficulty, as the opening 6 affords a
means whereby the air may pass out from the
top of the piston-chamber under the pres- 75
sure of the inflowing water and a means by
which a tool may be inserted to hold the valve
of the upper piston member open, so that
water drawn in by the lower member will
completely fill the piston-chamber and expel 8o
the air, whereupon by closing the cover 7 the
pump may be kept primed for use and both
piston members will operate to draw in and
expel water.
In drawing water the handle 35 is moved 85
lup and down in the manner stated, and on
the downward movement of the piston the
valve 20' opens to allow the water previously
drawn in through the branch passage 10 to
pass through the port 20 and cage 17 into the 90
space surrounding the piston, so as to be dis-
charged through the discharge-pipe upon the
upward movement, of the piston. When the
piston moves down wardly, as above described,
the valve 21' of the upper piston member is 95
held closed by the spring 24 and the valve 13
opens to allow water from the branch pipe
11 to flow upward into the passage 3. Upon
the upward movement of the duplex piston
the valve 21' opens to allow the water drawn ico
into the pipe 3 and into the upper end of the
piston-chamber to pass through the port 21
and the cage 18 in the upper piston member
to flow into the space between said piston
member and wall of the chamber 2 for exit io5
through the discharge-pipe 32. On each up-
and-down movement of the pistons the wa-
ter taken in by one is discharged by the other
through pipe 32 in an obvious manner. It
will thus be seen that as the duplex piston is Ito
reciprocated up and down in its chamber 2
the piston members will alternately act to
draw water into the lower end of the piston-
chamber and into the lower end of the verti-
cal passage 3, the valves alternately opening 115
and closing to provide for the proper flow of
water. Thus, for instance, upon the down-
ward movement of the duplex piston the
check-valve 12 closes to prevent the return
to the branch pipe 10 of the water contained 120
in the lower end of the piston-chamber 2 and
the piston-valve 20' opens to allow said wa-
ter to flow upward for discharge, while the
check-valve 13 opens to allow water from the
branch pipe 11 to flow into the passage 3 and 125
the piston - valve 21' is held closed by the
spring 24 to prevent the water taken into the
passage 3 from flowing down beneath the
valve into-the piston-chamber. The reverse
operation takes place upon the upward move- 130
ment of the duplex piston, so that one pis-
ton acts to take in water while the other pis-
ton is discharging the water drawn in upon
its previous movement.2
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Reference the current page of this Patent.
Hall, Sam N. Pump, patent, June 23, 1903; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth512935/m1/3/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.