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Патент USA US3077210

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Feb. 12, 1963
Filed Dec. 5, 1957
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ilniteri States @arent il? ma?
?ï'atented Feb. l2, läd?,
hopper and to the adjacent end of cylinder i6. Pump
unit i4- also has a discharge passage i7. Positioned
within the inlet id is the new and improved one-way check
valve 2t) of this invention. This valve, which will be
Marvin D. Bennett, Glendale, and Richard D. Bennett,
La Canada, Calif., assignors to Thomsen Supply, inc.,
presently described, allows tiow of material into the cyl
Los Angeles, Calif., a corporation of Caiifornia
Filed Dee. 5, 1957, Ser. No. 70%,894
4 Claims. (Cl. 137-525)
inder 16 through the inlet 18 but blocks flow in the re
verse direction.
Movable in the cylinder 16 is a piston 22 having a pis
This invention deals generally with one-way check
ton rod 24. Rod 2li is connected to the lower end of an
valves for controlling the ñow of fluids and more partic 10 arm 25', the upper end of which is pivoted on a cross
ularly with an improved check valve which is ideally
shaft 25ct on frame it). An intermediate point of arm 25
suited to controlling the ilow of granular tluid materials,
is pivotally connected, through a telescopically adjustable
such as plaster and cement slurry.
link 26, to a crank pin 27a on adisc 27. lDisc 27 is jour
lt is now common practice in the building construction
nalled on a terminally threaded, axial stud 23a projecting
ñeld to apply cement and plaster materials to building 15 from the center of a circular ñange 28 rigid on one end of
walls byspraying.
There is disclosed herein a new and
a shaft 29 journalled on frame lid. Disc 27 is retained
on the stud 28a by a nut, as shown. Frictionally received
improved constant delivery, positive displacement pump
which is especially designed for this use.
in aligned holes in the .disc and flange is a shear pin (not
shown) which is sheared under excessive pumping loads to
v The improved one-way check valve of this invention is
intended primarily for use in the improved pump de 20 prevent damage to the equipment.
Shaft 29 is driven from a motor 31 to cause reciproca
scribed and illustrated herein. lt should be understood,
however, that this particular use of the valve is intended
tion of the piston Z2 in the cylinder 16. Disc 27 is re
to be purely illustrative and not limiting in nature.
movable, by removing its securing nut, for replacement by
A broad object of the present invention is to provide a
another disc having a crank pin 27a with a diíîerent eiïec
new and improved check valve of the character described. 25 tive crank arm.
A more specific object of the invention is to provide a
Mounted on the frame l@ is a second piston pump unit
check valve which is ideally suited to controlling the ilow
32. This second pump unit includes an inlet conduit v34
of granular iluid materials.
through which extends the intake passage 34’ for the latter
Another object of the invention is to provide a check
unit. Conduit 34 is connected to the first pump unit >14 in
v valve which is so constructed that granular particles in the 30 such a way that intake passage 34’ communicates with the
, material ñowing through the valve cannot prevent the
discharge passage 17 of the first pump unit. Disposed
valve from closing completely whereby the valve is espe
in the conduit 3ft- is a second one-way check valve 36 iden
cially well suited in spray systems for plaster, cement and
tical to the one-way valve Ztl. Valve 36 permits ñow
like materials.
from the pump unit i4 to the pump unit 32 but blocks iloW
Yet another object of the invention is to provide a check 35 in the reverse direction.
valve which is adjustable to vary the distance of travel of
Second pump unit 32 includes a cylinder 3S in which
its check valve member between open and closed positions
is movable a piston liti. Piston 40 includes a rod 42,
so as to adapt the valve to use in a constant delivery
one end of which is pivotally attached to one end of an
arm 44. The other end of arm 44 is pivoted on cross
plaster and cement spray pump, such as that disclosed
40 shaft 25a. Pump 32 is provided with approximately
A further object of the invention is to provide a check
two-thirds of the displacement of pump 14 either by
valve of the character described which is simple in con
making the diameter of cylinder 38 less than that of
cylinder 16 or by making the stroke of pump 32 less
struction, inexpensive to manufacture, relatively immune
to wear, and otherwise ideally suited to its intended
than that of pump i4.
Arm ‘i4 journals an adjustable cam follower roller 46
The invention may be best understood from the fol
which bears against a cam 4S removably keyed on the
lowing detailed description taken in connection with the
shaft 29. Roller 46 is adjustable along the arm to adjust
annexed drawings, wherein:
the point of contact of the roller with cam 48. Cam 43
is thus rotated in synchronism with crank arm 27a and
FIG. 1 is a top plan View, partly in section, of a con
stant delivery, positive displacement pump embodying a 50 is operative to cause movement of the piston 40 to the
- pair of check valves according to this invention and show
left in its cylinder 38. The left-hand end ot' the cylinder
ing the valves in one position-of operation;
38 has an outlet S0 adapted for connection to a dis
charge hose S2, for example. This hose terminatesin
FIG. 2 is a view of the left-hand end of the pump in
FIG. 1 showing the check valves in another position of
a nozzle (not shown). The discharge passage 50’ of the
second pump unit extends through the outlet 50. Cam
FIG. 3 is an enlarged longitudinal section through one
d3 is removable for reasons to be seen.
of the check valves in FIGS. 1 and 2 showing the ball
Referring now to FIGS. l and 2, as well as FIGS'. 3
check of the valve in one position;
and 4, illustrating valve Ztl of this invention in enlarged
FIG. 4 is a view similar to FIG. 3 showing the ball
detail, the numeral 56 denotes an elastic check valve
checkin another position; and
member in the' form of a rubber ball. Ball 56 is con
FIG. 5 illustrates a modiñed check valve according to
tained in a cylindrical housing 58. Housing 58 has a
passage extending therethrough which is formed with a
the invention.
Referring now to these drawings, the illustrated con
reduced inlet portion bore 6i! opening into an enlarged
passage portion or chamber 62. Extending across the
stant delivery pump will be seen to comprise a trame 16
bore 6d are cross pins 64 which act as stops to limit left
of any suitable design. Mounted on this frame is a hop
hand travel of ball 56 in bore di).
per (not shown) for receiving a charge of material to be
Bore 6i? has a diameter approximately the same as or
pumped. Tl e pump illustrated is especially designed to
just slightly less than the diameter of ball S6, while the
pump plaster and cement materials.
Indicated at la is a iirst, or main, piston pump unit. 70 diameter of chamber 62 is substantially larger than ball
56. Pins 66 act as stops to limit right-hand movement
This unit includes a cylinder le having an inlet i8. This
of ball 56 in chamber 62. From this description, it will
inlet has an intake passage 18’ communicating to the
Thus, sevenal cams may be provided for selective- mount»
ing on the pump, each cam being designed for a par
ticular material or materias whose compression ratios
fall within a particular range.
Compensation for a change in the compression ratio
When flow in the opposite direction occurs through
from one material to another may also be accomplished
the valve, ball 56 is forced into the bore Gti and against
by adjusting the travel of the ball 5'6 in the check valves
the cross pins 64 at the left-han-d end of the bore. Axial
20 and 36 of the invention, as illustrated lin FIG. 5. In
pressure on the ball causes radial expansion of the latter
this figure, the numeral 100 denotes a sleeve formed with
against the wall of bore Gti to form a seal, as Shown
' in FIG. 4. During movement of ball S6 into the bore dil, 10 the inlet «bore 60, which is slideable in the valve housing
5S’. This sleeve mounts the cross pins 64 which limit
the wall of the latter is wiped clean by the ball (FiG. 3)
movement of the ball -56 in the bore 60.
' so as to >permit an eñicient seal to be formed. Valve 36
Sleeve 100 is adjusted in the axial directions indicated
is identical to valve 20 just described.
by a threaded shaft 162 operable exteriorly of the hous
The illustrated valve is highly desirable for the use de'
scribed since it is less prone to wear and accomplishes 15 ing 5S. This `adjustment of -the sleeve has the elîect of
varying the travel of »the ball 56 during closure of the
a liquid tight seal even with granular and abrasive mate«
valve and hence the volume of material necessary to
' rials, such as> plaster and cement. Conventional check
effect closure of the valve.
valves are not suitable for these latter materials inasmuch
In use, when a material to be pumped has less com
as any particles of the material on the seat of the check
valve would prevent the latter from completely closing. 20 pressibility than the particular material Áfor which the cam
43 is designed,rthe sleeve 100 will be shifted to the left,
During the pumping stroke, therefore, water in the mate~
as viewed in FIG. 5, to increase the travel ofthe lball 56.
rial‘will be squeezed out past the slightly unseated check
This has the efïect- of increasing the travel- of thev pump
*va1ve. vThis results in instantaneous setting of the mate
piston necessary to close the valve and hence compensat- "
rial in the valve and jamming of the latter.
Operation ofthe illustrated pump thus far described is 25 ‘ing for :the lesser travel ofl the' piston required »to com
press the ma-terial. Withtmaterials having greater com
as'follows. Assuming the hopper (not shown) to con
pressibility, of course, the sleeve‘llltì is adjusted in the
tain a charge of material to be pumped, such as moist
"be seen ’that ball 56 is movable from bore 6d into charn
ber 62 in response to liow to the right through the valve.
The clearance between the ball and the wall of chamber
62 provides a flow space about the ball.
plasteror‘cement, each right-hand' suction stroke of the,
piston 22 in the primary pump unit 14 draws material
into 'thef cylinder 16 from thehopper.
opposite direction.
Numerous-modifications lin design and'arrangement of
This material is 30 partsof -the invention are possible within the scope of
'pumpedï from the cylinder 16, »through Iconduit 34 vto
the second pump unit 32 during the left-hand, pumping
' stroke of> the 'piston' 22. Al portion of this material tiows
the following claims.
We claim:
l. Acheck valve `comprising a valve housing having
a ñuid passage therethrough defined in part by a smooth
The material entering the cylinder 38 of the second 35 walled cylindrical bore which. opens at one end into an
enlarged chamber, an elastic ball check -in said passage
pump unit 32 exerts a force on the piston 40 tending
movablebetween a closed vposition in-saidbore and-an
`to move the latter to the right and force the roller 46
open position in said chamber, said ball being receivable
on Varml 44 against the cam 48. The shape of the cam
into said bore and being elastically expandable to form a
48 is such as to allow controlled right-hand movement
'ofi piston 40, 'under' the action of- this force, during the 40 sealV therein, `and said ball hav-ing a diameter which is
appreciably less than-the cross-sectional dimensions of
f delivery stroke of the primary pump unit;
chamber, stop means in saidvch‘amber to limit open
`Tlie‘parts are so> proportioned that» during this de
ing movement ofthe ball in the chamber in a direction
livery‘st‘roke ofthe primary pump unit, a portion of the
away from said bore, land at least one cross pin extend
material delivered to the second pump unit is absorbed
by'right~hand movement ofthe piston 40. The remainder 45 ing across theV medial portion of said »borevWith-in the
cylindrical wall portion thereof to form an abutment
vof the'delivered material flows through the discharge 50
therein which prevents extrusion of the ball through
of the second Apump unit-’tothe hose k52.
»the bore and limits closing movement of the ball therein,
During each suction stroke of the primary pump unit,
which, when the ball is forced -thereagainst by. tiuid
vthe piston 40 of the second -pump unit 32 is forced to the
‘left by'the cam 48. This pumping stroke of the second 50 pressure, forms a depression in lthe ball inthe medial
region of thebore anda consequent compression in the
'pump‘unit' displaces the material remaining in the latter
center region of the ball such vas to thrust the ball off said
'unit after the previous' delivery stroke of the primary
pin when said ñuid pressure is relieved.l
pump unit. Thus, during each delivery and suction
2. The subject matter of claim l includingan additional
' strokelof' the primary pump lunit 14, a portion of the ma
terial pumped by the latter pump unit is discharged 55 cross pin extending across said bore at approximately
right angles to and approximately copianarly with the
through -the discharge 50 ofthe second pump unit.
iirst-mentioned cross pin.
' Thesecond'purnp unit 32, therefore, in eüe‘ct, evens
3. A check valve comprising a valve housing having
out the Vsurges in the flow of material from the iirst
a ñuid passage therethrough defined in part by a smooth
pump unit 14 so asto maintain a substantially uniform
delivery of material to the pump discharge 56 and hose 52. 60 walled cylindrical bore which opens at one end into an
enlarged chamber, an elastic ball check in said passage
In use of the illustrated pump for spraying cement,
' into cylinder 38 of the second pump unit.
plaster, and other similar materials, it is desirabrlîîîJ to
movable between a closed position in said bore and an
vvary the output' of the pump for different jobs.
open posi-tion in said chamber, said ball being receivable
>when spraying a finish plaster coat, the rate of delivery
into said bore and being elastically expandable to form
`of 'the pump is preferably less th-an for heavy base coats. 65 a seal therein, and said ball having `a diameter which is
Adjustment of Y'the pump output may be accomplished
appreciably less than the cross-sectional dimensions of
«by replacing the crank plate 27 by o-ne having a different
said chamber, stop means in said chamber to limit open
»effective crank arm for its crank pin 27a, and replacing
ing movement‘of the ball in the chamber in a direction
the cam 48 by a similarly shaped cam which will alter the
awayfrom said bore, and atleast one cross pin extending
total stroke of the second pump unit to fit the new stroke 70
across said lbore within the cylindrical wall portion there
lof the first pump unit.
of to form an abutment therein which prevents extrusion
Moreover, materials of the type under discussion have
of the ball through the bore and limits closing movement
different compression ratios. To this end, the cam 4S
of the ball therein, and which, when the vball is forced
is removable for replacement by a cam which is con
íigured tov suit the particular material to be pumped. 75 -thereagains-t by tluid pressure, forms a depression in the
ball and -a consequent compression of the ball such as
yto thrust the ball off said pin when said íiuid pressure is
4. A valve comprising 4a valve housing having a fluid
passage therethrough defined in part by a smooth Walled
cylindrical bore, an elastic ball check in said passage
movable between a closed position and an open position
in said bore, said ball being receivable into said bore
'References Cited in the tile of this patent
and being elastically expandable to form a liquid tight
seal therein, and at least one cross pin extending across 10
said -hore to -form an aubutrnent therein which prevents
in the ball and a consequent compression of the ball such 15 2,833,306
extrusion of -the lball through the bore and limits closing
movement of the ball therein, and which, when the ball is
forced thereagainst by -fluid pressure, forms a depression
as to thrust the ball otî said pin when said ñuid pressure
is relieved.
Lowrie ______________ -_ June 8,
Simpson _____________ _.. Feb. 15,
Keller _______________ ..._ June 29,
Clark _______________ __ Nov. 18,
Serres _______________ -_ Mar. 16,
Fuchs ________________ _, Mar. 25, 1941
Linstedt ____________ _.. Aug. 10, 1943
Strike _______________ -_ Nov. 25, 1947
Longenecker _________ _- Aug. 31, 1948
Martin _____________ _... Mar. 13, 1951
Longenecker _________ __... Aug. 3, 1954
Cummings ___________ _- May 6, 1958
Germany _____________ __ May 14, 1891
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