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Sept. 24. 19461
'
'w. F. THOMPSON
I
PUMP
Filed Maren >13,- 1945’
G
' 2,408,109
Patented Sept. 24, ‘1946
2,408,109
‘UNITED ,sTATgs’ PATEN T OFFICE
2,408,109 'I r _
PUMP
Willis F. Thompson, vPortland, Maine, assignor to
The Alden Speare’s Sons 00., Cambridge, Mass., 7
a corporation of Massachusetts . '
Application March 13, 1945, Serial No. 582,559, '
3 Claims. (01. 103L478)
1
_ The invention relates to a pump especially
adapted for the delivery of corrosive liquids from
containers, such as carboys.
. 1
Usually in pumps of this type thepumping op
eration is effected by a piston having a piston rod
by which the piston is reciprocated within a
chambered cylinder.
7
The piston, rod,
in order’
that it may be manually controlled,'extends out
side the cylinder through a joint in an end piece,
or head; which forms an end closure to the cham
ber of the cylinder... The joint, through which
the piston rod' slides, is open to the atmosphere,
and customarily the joint is sealed in some way
for preventing the escape of liquid from . the
a chamber of the cylinder when the piston is being
operated, and compression is ‘being developed
within the chamber. The sealing of the joint
may be effected in various ways; as bya packing
to the bottom of the container»(not shown) from
which the vliquid is to be Withdrawn, with up
' ward extension well above the heador mouth of
the container. The bottom . end of the lower
section 3 ofthe cylinder is provided with one or
more cutouts 5 in order that liquid may enter
the cylinder from the chamber of the container
when the cylinder is resting on the bottom‘of the
container.
'
-
Y
‘
The cylinder is provided at the lower end of
its section 3‘ with an inwardly, opening valve
which allows the entry of‘ liquid from the con
tainer upon the upward stroke of the piston,
later to be referred to, but closing upon its down
ward stroke. The valvular structure comprises
a valve seat 6 having a press ?t within the cyl
inder. V1 is the valve adapted to have opening
and closure, with relation to this seat. ' The stem
formed by some suitable more or less elastic ma
8 of the valve extends through the annular seat,
terial unaffected by acid, and which snugly em-_ 20 and is- provided with a cross pin 9 which engages
braces the. piston rod sliding throughit. The
the seat and limits the extent of opening of the
' , dif?culty with such a packing, however, especial
valve as the valve is drawn to an open position.
ly when the pump is being used for pumping‘
In its top end portion the cylinder is provided
corrosive liquids, is that the packing is apt to go‘
exteriorly with a sleeve or jacket I!) which has a
to pieces, or disintegrate.’ ‘In such case the cor 25 press ?t against the adjacent portions of the
rosive liquid within the cylinder of the pump, due
cylinder which it embraces. The jacket extends
* . vto compression, is apt to spurt through the joint,
upwardly beyond the end of the ‘cylinder, thus
thus deprived of its packing, andcause serious 7 providing‘an annularsocket I l .
injury to one operating the pump.
' , I
At its top end the ‘cylinder is provided with a
The object of the present invention is to elimi 30 baffle I2. ,This is seated to bear against the top
nate this dii?culty by providing a pump which
end ofthecylinder, and is held securely in place
needs no packed joint .for its piston rod; the
by an annular Washer l3 contained within the
elimination 'of packing being the objective pur
annular socket llwith press ?t against the ad
jacent top end of the sleeve or jacket l0.
The invention can best be seen and under 35
Located ‘within the cylinder, below and spaced
stood by reference to the drawing in which-—. '
from the ba?le I2, is a de?ecting‘wiper plate M.
Fig. 1 is a vertical section of a pump embodying
A chamber I5 is formed in the cylinder between
pose.
‘
the present invention.
'
'
'
,
'
.
.
p
.
Fig. 2 is a view partly in perspective of a por
the bafflev and the plate. The wiper plate is pref
erably, an inclined plate, inclined at substan
tion of the pump shownvinFig, 1', and which 40 tially an angle of 45°.v In order to insert the wiper
shows essentially the way in which the objective
plate the top end of the cylinder is made section
purpose of the invention‘is‘accomplished.
. _
al, there being provided an angularly cut end
Referring-to the, drawingfl represents the
chambered cylinderéofevthe- pump. 'The top end
. piece ,2'_;wh:ich-is held securely in place for re
tainingjthe de?ecting wiper plate by the sur
of the cylinder is closed in manner later to be 45 rounding sleeve or jacket l0.
described.
'
.
‘
The cylinder, for convenience in packing, is
Extending from the cylinder adjacent the wiper
plate is a pourout nozzle or spout l6 through
preferably made in two sections, of which 2 rep-'
which the liquid ‘exits‘from the chamber of the
resents the top section and 3 the bottom section.
cylinder. The spout is preferably of a relatively
The two sections are united by means of an in 50 large outlet capacity. The inner end of the spout
ternal sleeve 4 having a press ?t into the top end
extends through the cylinder and the jacket and
of the section 3, and threaded ?t, into the ad
makes threaded connection therewith, thereby as
jacent bottom end of section 2.
V
'
sisting in holding the jacket securely in place.
The cylinder as a whole is made of some con
Surmounting thetop'endl of the ’cylinder and _
' slderable length in order that it may extend down 55 having substantially its same tubular form, is a
2,408,109
3
4
is effectively stripped from the piston rod by the
hand grip [8 within which is inset a plug [9 into
ba?ie l2.
which is threaded the top end of a piston rod
In consequence, though some slight
moisture may remain upon the piston rod beyond
20, the hand grip forming the means by which
and above the baffle, yet spurting of the liquid is
entirely eliminated and danger of such avoided.
the piston rod and piston borne by it is recipro~
cated.
The piston rod extends through the baffle l2
Any liquid that may accumulate in the socket I I
above the baflle may escape, into the chamber
I5 below, by way of a small opening 21 at the
and de?ecting wiper plate M with easy sliding
?t.
'
side edge of the baffle. Liquid accumulating with
The piston comprises an internal sleeve 2| slid
able within the cylinder, and with which co-oper .10 in the chamber [5 between the deflecting plate
ates an annular valvular head 22 having a stem " and the ba?le will be drawn out of this chamber
23 which extends into the end of the piston rod '_Q ; through a small opening 28 at the extreme bottom
end of the chamber on the downward stroke of
and to which it is secured by a cross pin 25. The
pin 25 lies above the sleeve 2|; the head 22 below
I claim: ‘
,
,
it. The diameter of the head, as well as the
thepiston.
»
mechanism which includes a reciprocating piston
20
the sleeve. The’ combined head andsleeve will
r
1. In a pump having a cylinder and operating
length of the pin, is less than the diameter of the ‘
cylinder. The head is of such diametrical extent,‘
however, and the pin is of such length, that they
will, respectively, engage the sleeve for moving it
within the cylinder when the piston is reciprocat
ed. The head is spaced from the pin a distance
longer than the length of the sleeve, so that when
thepiston rod is raised the head will be brought
into closed engagement with the bottom end of
'
and piston rod, means forming an end closure
for tlce cylinder through which the piston rod
slidably extends, and comprising a baffle plate and
a de?ecting plate both ?xedly arranged within
the cylinder and spaced from one another to form
with the cylinder a chamber interposed between
said plates, the de?ecting plate forming the bot
25 tom of said chamber having within it a vent open
ing by which liquid‘ accumulating within the
then operate as a piston and induce a partial
chamber may be withdrawn from it during the
vacuum in the chamber of the cylinder below the
downward reciprocation of the piston. I
piston, causing liquid in the container to enter
2. In a‘ pump having a cylinder and operating
the chamber by way of the valve 1, then drawn
mechanism
which includes a reciprocating piston
open, and ?lling the chamber of the cylinder up 30
and piston rod, means forming an end closure
to the point of the ascending piston. During this
for the cylinder through which the piston rod
operation undisplaced liquid contained in the
slidably extends, and comprising a ba?le plate and
chamber of the cylinder above the ascending pis
a de?ecting plate both ?xedly arranged within
ton will be forced to outlet through the spout
l6. Upon the return of the piston, through low 35 the cylinder and spaced from one another to form
with the cylinder a chamber interposed between
ering of the piston rod, all in?ow of liquid from
the container will cease.
said plates and having within it a vent opening
by which liquid accumulating within said cham
ber may be withdrawn from it during the down
The valve 1 will be
closed. The head 22 will separate from the sleeve
thereby forming a communication through the
piston so that liquid in the chamber of the cyl
inder lying below the piston may enter that por
tion of the chamber of the cylinder lying above
the piston. The pin 25 will be ‘brought into en
gagement with the sleeve, moving it downwardly
through the chamber of the cylinder to the limit
ward reciprocation of the piston, the ba?ie plate
forming the top of said chamber'occupying a po
sition substantially normal ‘to the line of move
ment of the piston rod, the de?ecting plate form
ing the bottom of said chamber being arranged
in an angularly inclined position with relation to
the line of movement of the piston rod.
3. In a pump having a cylinder and operating
of the downward stroke of the piston rod, which
is limited by the engagement of its hand grip IS
with the top end of the cylinder, entering through
mechanism which includes, a reciprocating pis
ton and piston rod, means forming an end closure
the socket ll at the top end'of the cylinder.
In. the operation of the pump during the up- -
ward stroke of the piston, especially if the piston
is rapidly reciprocated, considerable liquid pres
sure will be formed in the chamber of the cylin
der although the ample capacity of they spout
:30
will assist in relieving this pressure.
I Liquid clinging to the piston rod as it is. raised
to pass through the de?ecting plate I4 will be
struck by the de?ecting plate and in large meas
ure be wiped off the rod. This e?ect is enhanced
by the angularity of the de?ecting plate which is
preferably angularly arranged, as previously ex
plained. Liquid that is not wiped off by the de
?ecting plate, and remaining upon the piston rod,
will, due to its surface tension, assume in the
chamber [5, droplike or cylindrical shape which
for the cylinder through which the piston rod
slidably extends, and comprising a baii‘le plate and
a de?ecting plate both-?xedly arranged within
the cylinder and spaced from one another to form
with the cylinder a chamber interposed between
said plates, the ba?le plate forming the top of
said chamber occupying a position substantially
normal to the line of movement of the piston rod,
the de?ecting platev forming the bottom of said
chamber being arranged in an angularly inclined
position. with relation to the line of movement of
the piston rod and having within ita vent opening
by which liquid'accumuiating within said cham
ber may be withdrawn from it during the down
ward reciprocation of the piston.
65
.
‘
WILLIS F. THOMPSON.
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