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Патент USA US2108311

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Feb; 15, 1938.
A. J. HARRIS
2,108,311 '
VARIABLE STROKE MECHANISM
Filed Oct. 26, 1934 V
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5 Sheets-Sheet l
Feb. 15, 1938.
A. J; HARRIS '
2,108,311
VARIABLE STROKE MECHANISM
Filed‘ Oct. 26, 1934
s Shéets-Sheet 2
Patented Feb. 15, 1938.
2,108,311
UNITED STATES PATENT OFFICE
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2,108,311
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VARIABLE STROKE MECHANISM
Albert J. Harris, Chicago, Ill., assignor to Hills
McCanna Company, Chicago, Ill.,- a corpora
tion of Illinois
Application October 26, 1934, Serial No. 750,057
2 Claims.
My invention relates to pumps and particularly
to chemical pumps having capacity adjustment
to permit supplying diiferent proportionate
amounts of liquid chemicals.
The invention. relates in some aspects to liquid
(CI. 74-40)
tudinal adjustment so that its point of pivotal -
connection with-piston I6 ‘may be varied, theme
by changing its stroke and thereby causing a va
riation in the length of the piston stroke to 'ac- '
5
complish the desired variation in the amount of 5
, pumps covered by Patents Numbers 1,858,184 and liquid pumped to secure desired proportions in a
1,858,185, issued May 10, 1932, to C. O. Buenger chemical mixture or the like. This longitudinal
of Chicago, Illinois.
shifting of the yoke 8 and consequent change of
One of the objects of the present invention is point of pivotal connection of said yoke with re
10 to provide a simple,v practical and advantageous ciprocating plunger I 6, has certain de?nite ad- 10
vconstruction of pump of the class speci?ed.
vantages which will be pointed out later on.
'
‘ Another object of the invention is to provide
While the longitudinal shifting ‘of this yoke 8
improved‘ and advantageous means for securing
and consequent variation in the point of pivotal
connection'with the reciprocating plunger could
adjustment of the capacity of the pump.
15
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Another object of the invention is to secure
this adjustment without unfavorably affecting
the stroke of the piston.
'
Fig. 2 is a plan view of the same;
Fig. 3 is a vertical elevation taken on the line
34 in Fig. 1;
I
one. construction which I have found very ad
vantageous and satisfactory.
Other objects of the invention will appear and
be pointed out hereinafter.
In the accompanying drawings:
Fig. 1 is a side elevation of a pump embodying
my present invention;
25
be accomplished in various ways, I show herein
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Fig. 4 is a horizontal section taken on the line
4-4 in Fig. 1;
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In this construction the yoke 8 is preferably
formed of two side members lie-8“, which are
arranged on opposite sides of the pump plunger
l6, and these side members 8a are made in the
shown in Fig. 4, and ?tted between the side mem
bers 8*ik-8a and “provided with longitudinal side 25
slots to receive said side members 8“, as shown in
Fig. 3, whereby the yoke 8 may be shifted along
carriage l8 by sliding on the members 8*. The
Fig. 5 is a vertical-section of the lower end of
the pump cylinder; and‘
sides of the carriage I8 are arranged on opposite
30
Fig. 6 is a transverse section taken on the line‘ sides of piston l 6, as shown in Fig. 4, and provided
6--6 in Fig. 5.
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form of guides to support and guide a carriage
l8 which is preferably made in U form, as
with screws I9 which serve as pivotal pins for
0
In the accompanying drawings, I show a pump I pivotally connecting carriage l8 with piston iii.’
embodying a base | on which may be mounted an For shifting yoke'8, a rotary member 2| is pro
electric motor 2 connected by a rotary shaft '8
35 to a speed reducing device 4.
vided and arranged for rotation in a bearing 22
in carriage l8 but will be held against longitudi
'The speed reducing device 4 is'preferably pro» . nal movement by ring 23 ?tting in a recess in the
vided with a rotary crank arm 5 whose outer end
is pivotally connected at 5?‘to one end of a-link
'40
6, the other end of link 6 being pivotally connect
ed at l to a swinging yoke 8 which is pivotally
connected at its opposite end by pivots 9 to swing
ing arms i8 which are in turn pivotally connect
ed at ii to the upper end of the pump case l2,
which latter is secured by bolts H to a base IE
45 on the main base or platform I.
The yoke 81s pivotally connected with the re
ciprocating piston or plunger i8 which is ar
rangedto reciprocate in‘ the piston cylinder or
‘ barrel I‘! on the case I2, being preferably formed
integrally and as a part of said case l2. The
rotation of crank arm 5, resulting in the actua
tion of link 8 and swinging of yoke 8 about its
fulcrum pivots 9, results in the reciprocation of
plunger l6 and thereby effects the pumping act.
55
This yoke 8 is preferably arranged for longi
end of rod 2| and in a co-operating recess in
carriage l8.
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This rod 2i extends lengthwise of yoke 8 and
out through an end member 24 thereon, being
provided with a handwheel 25 at its outer end.
Said rod 2| is screw-threaded and co-operates
with the threads on cross-member 24, as shown
in Fig. 4, whereby rotation of handwheel 25 will
cause rotation of rod 2i and adjustment of said
rod relatively to ‘yoke 8 by meansof threads on
said rod 2| and member 24, and thereby cause
the shifting of yoke 8 longitudinally along yoke
bars 8' and the consequent change in the‘ point
of pivotal connection of yoke 8 with the piston 50
rod or plunger i8.
I
Thus it will be seen that this longitudinal ad
justment of yoke 8, with its effect of changing
the point of pivotal connection between said yoke
and reciprocating plunger It, has the eifect of 55
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2,108,311
changing the point of application of power of
the lever which is in e?ect formed by yoke- 8,
and shortening or lengthening the length of le
dividing the packing material 28 into two parts.
verarm or part of the lever which acts upon
I1, so that an inlet pipe for the liquid may be
connected to one aperture 3! and an outlet pipe
plunger I6 and thereby varies the length of
stroke of said plunger “5.
As handwheel 25 is
turned to shift yoke ,8 to the right, (Fig. 1) the
distance between pivots l9 and 9 is decreased,
and consequently the effective length of lever
10 formed by yoke 8 is shortened and the plunger
IE will have a shorter stroke.
Likewise, a con
verse shifting of yoke 8 to the left, (Fig. 1) will
have the e?ect of increasing the distance be
tween pi'vot pins 9 and i9, thereby lengthening
15 the effective lever arm operating on the piston
l6 and lengthening the stroke of said piston.
A marked advantage of this arrangement is
that while the stroke of the piston is thus varied
as desired to secure changes in the piston stroke
and consequent changes in the pump output, the
stroke or location of the piston or plunger is not‘
unfavorabiy affected, as has been the case in
other constructions for securing variation in the
plunger stroke. This is due to the fact that shift
ing of yoke 8 to one side or the other retains the
point ofpivotal connection between yoke 8 and
plunger 16 at substantially the same height ~or
elevation and so does not have the effect of
varying the position of the piston, in the cylinder,
3O by bodily raising or lowering it and causing it to
work in a different position in the piston cham
ber, as is the case with certain other construc
tions and arrangements for securing variation
' of piston travel.
This present arrangement on
the other hand has the effect of maintaining the
piston plungerv in a substantially constant posi
tion, changing only the length of stroke, notwith
standing shifting in the point of connection of .
piston with the yoke 8, and hence the piston will
40 Work in the lower portion of the piston cylinder
where it is originally placed by adjustmentv of
the parts, notwithstanding changes in the length
of stroke of the'piston.
Referring to Figs. 5 and 6, there is shown in
those figures an arrangement for packing and
cleansing the piston in the piston cylinder, so
as to prevent the formation of solid material from
~the chemical solutions which would interfere
with the proper operation of the pump.
These ?gures show the piston rod it with its
lower enlarged end) l6“ and the upper end of
the piston cylinder or chamber I1, and a stu?ing
box arrangement for the same. This stuffing box
arrangement involves a packing gland 21 adapt
ed to ?t in the upper end of cylinder I1, and pack
ing material 28-28 arranged in the packing
chamber, and a ring 29 also arranged in said
chamber and surrounding the piston end 16a and
This ring 29 has apertures 30 which are arranged
opposite apertures 3| formed in the cylinder end
for the same to the other aperture 3!, thereby
permitting circulation of water or other liquid,
if desired, through the packing gland to prevent
freezing or coagulation of the ‘chemical mixture
being pumped, and for other purposes if desired.
It wil be understood that changes and modi
?cations may be made without departing from the
spirit of the invention.
What I claim is:
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1. Actuating means for a pump piston, com
prising a power member having a rotarycrank
arm, a link having one end pivotally connected
with said crank arm, a piston-actuating lever
pivotally connected withthe other end of said‘
link, said piston-actuating lever being in the
form of a yoke extending crosswise of the piston
and having members on opposite sides of the
piston, a carriage along which the side members
of ‘said yoke are slidable and provided with pivot
pins forming a pivotal connection with the pis
ton, swinging supporting links pivoted at one
end to the end of said yoke opposite said link
and pivoted at the other end to the piston cas
ing, and means for adjusting said piston con
necting carriage lengthwise of said yoke, said
means comprising a rotary threaded bar or rod
having one end connected with said carriage so
as to permit rotary but prevent longitudinal
movement, said threaded bar engaging a thread
ed member on the yoke, and a rotary handle on
said bar rod to turn the same and thereby cause
said threaded'bar rod to adjust said carriage.
2. Actuating means for a piston. comprising a
power member having a rotary crank arm, a link
having one end pivotally connected to said crank
arm, a piston-actuating lever pivotally connected
with the other end of said link, said piston-actu
ating lever comprising a pair of spaced parallel
bars forming a pair of tracks, aU-shamd car
riage embracing and pivotally connected to the 45
piston and embraced by said bars and engaging
said tracks, means for advancing said lever with
respect to said carriage comprising a screw mem
ber engaging the bight portion of the U-shaped
carriage and rotatable but immovable longitudi
nally with respect thereto, a transverse bar join
ing the two parallelbars, said screw being thread
ed through said transverse bar so that upon turn
ing of the screw the parallel bars are moved with
respect to the‘ carriage, and a swinging fulcrum ,
for the piston-actuating lever.
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ALBERT J. HARRIS.
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