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Патент USA US2404547

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l July 23, 1946.
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c. J. sTRlD
2,404,547
HYDRAULIC` PUMP
Filed March v6', 1945
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Patented July 23, >1946
2,404,547
UNITED STATES PATENT OFFICE"
HYDRAULIC PUMP
Cari J. sind, La canada, Calif., as'signor tondi-,1
Precision Products Corp., a corporation of Cali
fornia
Application March 6, 1945, Serial No. 581,209 Y
` 8 Claims.
l
(c1. 10s-178)
Z
This invention relates to auxiliary hand pumps
as used in hydraulic systems, particularly in air
craft, for operating such systems in case of failure
As shown in detail inthe accompanying draw
ing, my invention is embodied in a pump which
includes a cylinder 6 having an intake port l,
a discharge port 8and a check valve 9 controlling
the intake port in the usual manner.
Sl-idable through a stuffing box I!! Within the
cylinder is a piston rod II which is reciprocated
of the main pump or when the latter is shut off.
An object. of this invention is to provide a hand
pump of the character described which has a
novel and advantageous. piston-valve construction
by means of which the number of parts is greatly
by means of a lever I2 fulcrumed as at I3` on a
reduced, the construction is appreciably simpli
bracket I4 on the cylinder, there being a link I5
fied, the cost of manufacture reduced and the op
connecting the lever with said rod.
eration of assembling, disassembling and servic
ingr the pump rendered extremely simple and sub
ject to being readily and easily carried out.
Another object of this invention is to provide
a piston-valve arrangement in which a simple do
nut type sealing ring or rubber, synthetic rubber
'
Í
As here shown a piston head I6 is formed in
tegral with the rod II and has a Working nt in f
the cylinder, although this head, as is obvious,
could bel a separate part if desired.
15
or the like serves as a check valve as Well as an
eñicient seal between the piston and cylinder
wall.
In accordance With my invention a sealing ring
Il on the piston I5 made of synthetic rubber or
the like, servesy as a valve, the piston being con
structed and arranged to provide for limited
movement of this ring relative to the piston head
Yet another object is to provide a novel and 20 as well as to provide a fluid passagel through the
eñicient piston-valve through the simple ex
pediency of enlarging the sealing ring groove in
head, which passage is controlled by the check
valve action of the sealing ring responsive to re
ciprocation of the piston assembly. Y This makes
it unnecessary to use the customary separate
the piston and forming ports through the piston
head in an arrangement such that on one stroke,
the sealing ring will move to a position opening 25 check valve assembly in the piston and eliminates
the ports for passing ñuid through the piston and
parts, Weight and production and upkeep costs
on the other stroke will move to a posi'tion'closing
compared to pumps as heretofore made.
In carrying` out my invention the piston head f
liì- is providedwith an enlarged sealing ring groove
said ports to the flow of fluid' through the pis
ton; this piston-sealing ring valve arrangement
making it unnecessary to use the customary sep
arate check valve assembly in the piston and re
30 I8 having ya width (extenty axial-ly of the piston
head) considerably greater than the sectional
width or diameter of the sealing ring I-'l which is
preferably of circular cross. section. This makes
ducing weight, number of parts and production
costs compared to pumps of this class as hereto
fore madey while also maintaining the desired seal
between the piston and cylinder.
'
With the foregoing objects in View, together
it possible for the ring to act as a valve to con
35 trol the now of fluid through the piston head,` in
with such other objects and advantages as may
subsequently appear, the invention resides in the
asmuch as the pressure of the fluid plus the fric
tional resistance of the sealing ring against the
cylinder wall causes the ring to shift bodily re
sponsive to reciprocation of the head.
parts and in the combination, construction and
arrangement of parts hereinafter described and 40
The passage for íiuid through the piston- head
claimed, and illustrated by Way of example in
includes a plurality of diagonal ports IIS extend
the accompanying drawing, in which:
`ing from the outer end of the head into the
Fig. 1 is a side elevation of a pump embodying
groove I8 `so' that in- one position the sealing ring
Il will close the ends of these ports Which ends
Fig. 2 is an enlarged fragmentary longitudinal 45 open through the side wall `I8’ of the groove.
sectional view of the pump showing the piston
Fig. 3 shows how the ring Ill' is forcedk against
and sealing ring valve action during one stroke of
and closes the ports I9, being held> in such posi
the piston assembly;
tion by the pressure of the fluid as the piston as
Fig. 3 is a View similar to Fig. 2 showing the
sembly is moved in the direction of the arrow
valve action on the other stroke of the piston as 50 shown in Fig. 3. The rest of the ñuid passage
my invention;
‘
sembly;
Fig. 4 is a fragmentary sectional View taken
on the line 4_4 of Fig. 2;
Fig. 5 is a fragmentary sectional view taken on
the line 5_5 of Fig. 2.
55
through the piston head is provided for by means
of radial ports 2B extending from the bottom of
the groove 8 into an axial bore 2I in the center
of the head and by a second set of radialy ports
22 leading from the bore 2| to the. periphery of
2,404,547
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having a fluid by-pass passage extending there
through and an elastic sealing ring groove therein
the piston rod H at a point adjacent the rear
face of the piston head. With this arrangement
intersecting and forming ra part of said passage,
and a sealing ring mounted in said groove and
positioned and dimensioned to have a constant
sealing contact both with the head and Withsaid
of the portsV i9, ring groove I8, radial ports 20,
axial bore 2| and radial ports 22, a by-pass pas
sage is provided in a most economical manner
through the piston head, subject to control by
cylinder, said ring and groove being dimensioned
so that the ring wil1 shift into and out `of posi
tions for opening andA closing> said passage upon
the sealing ring l1 while the latter maintains a
most eiîective sealibetween the piston and the
wall of the cylinder 6. A suitable plug 24 closes
reciprocation of said head while maintaining a
seal between the piston head and the cylinder or
rection of the arrow in Fig. 2, that is, toward ‘ bore wall associated with the head.
3. In a piston valve-sealing ring unit, a cyl
the intake port 1, the check valve 9 prevents dis
inder, a reciprocal piston head in said cylinder
charge through said port and the pressure ofv the
fluid against the ring l1 plus the frictional re 15 having a iiuid by-pass passage extending there
through and a sealing ring groove therein inter
sistance of the cylinder against said ring causes
secting and forming a part of said passage, and
the ring to shift to the left so as to abut and lie
a sealing ring mounted in said groove and posi
against the side wall 25 of the ring groove I8,
tioned and dimensioned to'have a constant seal
thereby providing an open by-pass passage
through ports I9, ring groove , I8, radial ports 20, 20 ing contact both with the head and with said
cylinder, said ring and groove being dimensioned
bore 2l and ports 22 so that fluid will flow past
so that the ring will shift into and out of p0
the piston while the ring l'! maintains an effec
sitions for opening and closing said passage upon
tive seal between the piston head and the cyl
reciprocationof said head while maintaining a
inder.
‘
seal between the piston head and the cylinder or
As shown in Fig. 3, when the piston assembly ‘
bore Wall associated with the head, said ring being
is moved in the direction of the arrow, that is,
normally of substantially circular cross section.
toward the discharge port 8, the pressure of the
4. In a piston-valve-sealing ring unit, a piston
fluid against the ring ll Vcauses it to shift against
head having a circumferential sealing ring groove
the side Wall i8’ so yas to close the ports I9 and
prevent iiow of'fluid through the by-pass pas 30 therein, ports extending from one end face of
the head so as to open through one side wall of
sage in the piston head. This causes the check
said groove into the latter, said head having an
valve 9 to open and fluid to be drawn into the
cylinder through port 1 while fluid is discharged
axial bore closed at its ends, ports extending
from the bottom of the groove into said bore and
through port 8. Rearward movement of the pis
ton is limited by means of a stop shoulder 26 on 35 other ports extending from said bore s0 as to
the outer end of theaxial bore 2|.
`
,
When the piston assembly is moved in the di
complete a fluid by-passpassageway through said
\
It is now apparent that in making the ring
head, and a sealing ring in said groove, said
groove of greater Width than usual and in forming
groove and seal being dimensioned so that the
a by-pass passage through the piston head in
ring will shift in the groove into positions for
:40
tersected by the groove so that the sealing ring
opening and closing certain of said ports to open
will shift into and out of positions for opening ` and close said «by-pass passageway through said
and closing the passage, I have provided a most
head upon reciprocation of said piston head.
efficient combined valve and seal which makes
5. In a piston-valve-sealîng ring unit, avcylin
it unnecessary to use the separate sealing ring
der, a piston head in said cylinder having a cir
and the separate check valve heretofore required. .
cumferential sealing ring groove therein, ports
the rear face of the piston head.
This piston-valve-sealing ring-unit, while here.'y
extending from one end face of the head s0 as
shown in a pump, may, however, be used in any
Vto open through one side wall of said groove into
the latter, said head having an axial bore closed
other device or mechanism where a piston or likey
member is employed and it is desired to control
theV flow of fluid through a passage therein in
accordance with this invention.
.
While I have shown and described a specific
embodiment of my invention, I do not limit‘my
self to the exact details of construction set forth,
at its ends, ports extending from the bottom of
the groove into said bore ‘and other ports extend
ing from said bore so as to complete a fluid by
pass passageway through said head, and a seal
mg ring in said groove for effecting a seal be
tween
the head and the wall of said cylinder, said
and the invention embraces such changes, modi 55 groove and seal ybeing dimensioned so that the
ñcations and equivalents of the parts and their f
ring will shift in the groove into positions for
formation and arrangement as come Within the
opening and closing the first named ports where
purview of the appended claims.
rvI claim:
1. In a piston valve-sealing ring unit, a cyl
inder, a reciprocal pistonl head in said cylinder
having a ñuid by-pass passage extending there
through and a sealing ring groove therein inter
by said passageway Vis open and closed to pas- f
00 sage of ñuid therethrough upon reciprocation
of the head.
Y
6. In a pump, a cylinder having an intake port
and a discharge port, a check valve controlling
said intake port, a piston rod in said cylinder,
secting and forming a part of said passage, and a
for reciprocating said rod, a piston head
sealing ring mounted in said groove and positioned 65 means
on said rod reciprocable in said cylinder and hav
and dimensioned to have a constant sealing con
tact both with the head and with said cylinder,
said ring and groove being dimensioned sovthat
the ring will shift into and out of positions for
opening and closing said passage upon recipro
ing a sealing ring groove extending circumfer
entially thereof, and a icy-pass passageway -which
intersects said groove so that a part of the groove
forms a part of the passageway, and a sealing
cation of said head while maintaining a seal be
tween the piston head and the cylinder or `bore
ring mounted in said groove to shift axially of
vthe head responsive to reciprocation of the head
wall associated with the head.
2. In a piston valve-sealing ring unit, a cyl
said passageway to the passage of fluid through
inder, a reciprocal piston head in said, cylinder
and to assume positions for opening and closing
said head, said ring at alltimes beingv in‘sealing
9,404,254?
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éontact with said cylinderfand piston head to
having a head provided with a circumferential
prevent leakage therebetween.
sealing ring groove therein and ports extending
f
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t
7. In a pump, a cylinder having an intake port
and a discharge port, a check valve controlling
said intake port, a piston Vrod in said cylinder,
means for reciprocating said rod, a piston head
on said rod reciprocable in said cylinder and
having a, sealing ring groove extending circum- l
from one end face of the head so as to open
through one -side wall of said groove into the
5
latter, said head having a bore passing axially
therethrough and terminating in the rod portion
of the piston, a plug closing the outer end of said
bore, ports extending from the bottom of the
ferentially thereof, a port extending from the
groove into said bore and other ports extending
outer end of the head and opening through one lÚ from said bore so as to complete a iiuid by-pass
side wall of said groove, and a sealing ring mount
ed in said groove so as to move axially of the
passageway through said head, and a sealing ring
in said groove for effecting a seal between the
head into and out of position closing the first
head and thewall of the cylinder surrounding
named port responsive to reciprocation Vof said
said head, saidgroove and seal being dimensionecl
head, said head having a passage therein lead 15 so that the ring will shift in the groove into po
ing from the bottom of said groove, through said
sitions for opening and closing certain of said
head and rod to a point on the exterior of the
ports to open andclose said by-pass passageway
rod rearwardly of said head.
through said head upon reciprocation of said
8. In a piston-valve-sealing ring unit, a cylin
piston head.
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der, a piston reciprocable in said cylinder and
CARL J. S'VI‘RID.
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