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Патент USA US2405949

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Aug. 20, 1946.
A. L.‘ GRISE
'
' 2,405,949
1v
FLUID PRESSURE MOTOR
‘Filed [June 11,‘ 1945_
2 Sheets-Sheet 1
INVENTOR
-
T
ORNEYS
'
I
Aug. 20, 1946.
I
'
_
A, L, GRISE "
2,405,949
' v‘FLUID PRESSURE MOTQR
Fil'ed June 11, 1945
2 Sheets-Sheet 2
.
1
A: 5950 .Z. 6km:
_ BY
_
ATTORNEYS
I
'
Patented Aug’. 20, 1946
_ 2,405,949
STATES PATEN
7
2,405,949
FLUID PRESSURE MOTOR
Alfred L. Grisé, Spring?eld, Mass, assignor to
Gilbert & Barker Manufacturing Company,
West Spring?eld, Mass, a corporation of Massa
chusetts
Application June 11, 1945, Serial No. 598,775
7 Claims. (01. 121-—152)
1
2
This invention relates to improvements in mo
I. For moving the piston 6 on its return stroke,
whenever the passage 12 is connected to exhaust,
any suitable yieldable means may be used. Pref
tors of the reciprocating piston type, adapted to
be operated by ?uid under pressure.
The invention is also an improvement on that
erably such means takes the form of a piston
disclosed in my U. S. patent application Serial
l3 which is considerably smaller in diameter
No. 554,406, ?led September 16, 1944, and ma~
than the piston 6 and. which reciprocates in a cyl
tured as Patent No. 2,389,621. In the motor of
inder [4, formed in a tubular upward extension
that application the supply of pressure ?uid to,
45 of the upper head 3 and coaxially of cylinder
and the exhausting of pressure ?uid from, one
l. The piston I3 is rigidly connected to the
end of'the power cylinder of the motor is cone 1, piston 6, ‘as by the rod 53. The pressure ?uid is
trolled by a valve means which is suddenly op
continuously supplied to the upper end of cyl
erated by the pressure ?uid once its action is
inder M by way of a passage ll formed in head
initiated by a suitable transmission from the
3, a passage l8 in a tube l9, which is clamped
power piston of the motor.
between heads 3 and 4 and sealed by the pack
This invention has for its object the provision ‘ ing-s 20; and a passage 26)’ which is formed in the
of an improved valve means and initiating means
lower head 4 and which is adapted for connec
therefor, characterized by a simpli?ed and im
tion to a suitable source of ?uid under pressure.
proved arrangement of parts of the structure,
Thus, whenever the lower end of cylinder l is
‘calculated to enable better operation and satis
connected to exhaust, the pressure ?uid in the
factory operation over a substantially longer pe- ’ ' upper end of cylinder II; will force piston l3
riod of time.
downwardly and thus move piston 6 on its return
The invention will be disclosed with reference
stroke. When, however, pressure ?uid is ad
to the accompanying drawings, in which
mitted to the lower end of cylinder I in a man
Figs. 1 and 2 are small-scale side elevational
ner to be later described, the piston 6 will force
and top plan views, respectively, of a ?uid press-*
piston 53 upwardly forcing out the air above it.
sure motor embodying the invention;
The pistons may be of any suitable construc
Fig. 3 is a full size sectional elevational view
tion. As shown, the piston 5 comprises a piston
thereof taken on the line 3-3 of Fig. 1; and
leather 2i clamped between a body 22 and the
Figs. 4 and 5 are "fragmentary sectional plan
disc-like ?ange of a nut 23, threaded onto a
views taken on the lines 4-4 and 5-5, respec4
central depending part of the body I. The bot
tively, of Fig. 3.
tom of said part seats on a shoulder of rod 1.
Referring to these drawings; the motor in
The upper end of rod 1 is threaded to receive
cludes a power cylinder I formed within a barrel
the lower end of rod H3. A disc 24 is interposed
or tube 2, which is clamped between upper and
between the lower end of rod 56 and the upper
lower cylinder heads 3 and 4, respectively, by“
face of body 22.
a series of long cap screws 5. Reciprocable with
in cylinder I is a power piston 6 to which is suit
to clamp disc 24 against the piston body 22 and
ably ?xed the piston rod 7.
The latter passes
The rod I8 is turned as a nut
the latter against the shoulder on rod 1. The
upper piston l3 includes a piston leather 25
clamped between two discs 26 by a nut 21 on the
reduced and threaded upper end of rod 16. The
through the lower head 4 and through a suitable
stu?‘ing box 3 therein and is adapted vfor con-'
nection to the piston of the grease pump or any
nut forces the discs’ and leather together and
other device that is to be operated by the motor.
against the top wall of an inverted cup-shaped
In the present case, the lower head 4 is adapted
member 28, which wall is interposed between the
to be supported on top of a grease drum, indi
lower disc 25 and a shoulder on rod l5, and
cated in part at d, or as indicated in said appli 45 forces such wall against the shoulder.
cation, and the cylinder 9 of the grease pump is
V The control of the ?ow of pressure ?uid to and
connected to the central hub in depending from
from the lower end of cylinder 1 is effected by
the head or base 4. The outlet of the grease
valve mechanism contained in a casing 29 which
pump is formed in part in the base 4 as indicated 7 has near its upper end a faced-off side ?ange 30,
at H.
50 which is clamped to a boss 3| on the upper head,
The power piston 6 is adapted to be lifted, or
moved on its power stroke, by fluid under pres
sure, such for example, as compressed air, ad
mitted through a passage [2 formed in the lower
with a gasket 32 interposed between them, by
two cap screws 33. Formed in the ?anged upper
end of casing 29 is an inlet passage 34 for the,
pressure ?uid. This passage communicates at
head 4 and opening into the lower end of cylinder 55 one end with the lower end of a passage 35,
2,405,949
4
3
formed in the head 3 and having its upper end
communicating at all times with the upper end
of cylinder Hi at a location which is above the
upper end of piston 13 when the latter is at the
upper end of its stroke. Pressure ?uid ?ows from
will be in their uppermost positions and the spring
55 is su?iciently strong to hold the pistons and
connected parts in such positions against the
force of gravity. The spring is not strong enough
the passage ll across the upperend of cylinder
l4 and through the passages 34 and 35 to the
pistons, The raising and lowering of the valve
to have any material effect in raising the valve
pistons is effected by ?uid pressure as will later
be described in detail.
To initiate the movement of the valve pistons
axially-spaced cylindrical portions 36 and 31, 10 in each direction, a lever 56 is employed. One
end of this lever is forked (Fig. 5) to straddle
united by an integral web 38, which is of U
the small-diameter connecting portion 48 and lie
shaped cross sectional shape and affords a cham
between the adjacent end faces of the valve pis
ber 39 having a side opening 39’ confronting the
tons 46 and 47. Such end of the lever is housed
barrel 2 of cylinder I. In the cylindrical por
tions are eoaxially disposed valve cylinders 40 15 within the chamber 39 and is pivoted on a pin
51 supported at its ends in the side walls of the
and ill, the adjacent and confronting ends of
web 38. The other end of lever 56 extends
which open into the chamber 39. The inlet pas
through a vertical slot 58 in the upper portion
sage 34 opens into the upper end of cylinder 40.
of the barrel 2 and radially into the cylinder I
The lower end of cylinder 4! is closed by a head
42, screw threaded into the same. Such head 20 with its inner end located in the path of the
disc 24 and the cup 28. When the piston 6 nears
has an outlet passage 43 leading from the lower
the upper end of its stroke, the disc 25 will en
end of cylinder 1H and connected by a tube 44
gage the inner end of lever 56 and lift the same
and a compression coupling 45 to the passage l2
slightly, just enough to crack valve 50 off its seat.
in head 5.
Slidable in the valve cylinders 40 and 4| are 25 Immediately this occurs, ?uid under pressure
?ows into cylinder 41 and forces the pistons rap
valve pistons {it and 41 respectively, which are
idly upward, also moving the lever 56 ahead of
interconnected by a cylindrical part 138 of smaller
the disc 24. The valve reversal is practically in
diameter than either piston. The upper valve
stantaneous, The piston 8 then starts down
cylinder and piston are smaller in diameter than
wardly under the force of the fluid pressure on
the lower valve cylinder and piston. 0n the up
piston 13, since the lower end of cylinder I is
per end of the upper piston is a valve 49 adapted
free to exhaust through the uncovered ports 53.
to control communication between the inlet pas
When the piston Shears the end of its down
sage 34 and cylinder 48, permitting such com
stroke, the lower edge of cup.28‘will engage the
munication when the pistons, are in their illus
trated and lower positions and preventing such 35 lever 56 and move it downwardly enough to crack
valve 49 from its seat, whereupon the pressure
communication when the pistons are in their up
?uid rushes into cylinder 40 and forces the piston
permost positions. On the lower part of piston
45 downwardly, causing the exhaust ports to be
d‘! is a valve 59 which controls communication
closed and the valve 50 to close, thereby admit
between the lower cylinder 4! and the outlet 43,
preventing such communication when the pistons 40 ting pressure ?uid to the lower end of cylinder l.
The initiation of the downstroke of the valve
are in their lower and illustrated positions and
upper end of the valve casing.
The casing 2-8 has two coaxially-disposed and
permitting such communication when the pistons
means may not in all cases be necessary.
With
a pressure ?uid supply which is always main
tained at high limits, the valve means will start
extends axially through valveli?, piston ‘ll, mem
ber G8 and partly through piston 46 and termi 45 its downstroke without recourse to the down
stroke-initiating-means described. But the valve
nates at and intersects with a passage 52. The
means must operate reliably under all conditions
latter extends diametrically through a portion of
are in their uppermost positions.
A passage 5|
usually encountered, wherefore the downstroke
the body of piston 46 which portion is located
initiating-means is desirable to guard against low
above the piston packingr and is somewhat smaller
in diameter than the cylinder so as to permit 50 pressure condition of the pressure ?uid supply.
Also, where, as herein shown, the valve means is
vertically-disposed and a spring such as 55 has
to ‘be used, this spring may exert more force on
the closed~valve than does the pressure ?uid so
of cylinder 4|, passes through passages 52, 5|, d3, 55 that is necessary to crack valve 49 o? its seat
to initiateits downward movement. The force
G4 and :2 into the lower end of power cylinder l.
of the spring on the closed valve might be over
When the pistons are raised, valve 49 closes and
come when pressure of the ?uid supply is high
stops the supply of pressure fluid to cylinder I.
and not when the pressure is low. Thus, the
The valve 53 will then be open so that pressure
fluid can enter the cylinder 4!. This cylinder 60 initiation of the downstroke of the valve pistons
continuous communication between the upper
part of cylinder lit and the passage 52. Thus,
with valve 49 open and valve 58 closed, the pres
sure ?uid from passage 3% enters the upper end
has exhaust ports 53 in its side wall and these
ports are uncovered when the pistons rise su?l
ciently.
by the transmission described from piston 6 is
desirable even though it may not in all cases be
necessary.
'
The cons ruction of the valve casing with the
A baffle plate 55 is secured at its ends as indi
cated to the inner side wall of cylinder iii and 65 two axially-spaced cylinders 36 and 3'! and the in
intermediate its ends is spaced slightly away from
such side wall. The battle de?ects the exhaust
air upwardly and downwardly and serves to ma
tervening chamber 39 with the side opening 39’
is thought to be important. It enables connec
tion to be made with the valve pistons at a lo
cation between their outer ends without the use
terially quiet the exhaust.
When the valve casing is arranged vertically 70 of a stu?ing box 01' other sealing means. The in
termediate portion of the valve pistons-fin this
as shown, it is preferable to provide a spring,
case the connecting part 48—-crosses the chamber
such as 55, in the lower cylinder 4| to counter
39 and the member connected to such part—in
act the action of gravity on the valve pistons and
connected par-ts. When the source of ?uid pres
this case the lever 56—can pass out of the cham
sure is shut off or disconnected, the valve pistons 75 ber 39 through the side opening 39' and through
g
2,405,949
the slot ‘58 in the upper part of the barrel 2. The
6
and open the second valve and the exhaust port:
pistons 46 and 41 serve as the only sealing means
and means for moving the power piston on its .
necessary. The use of a stu?ing box requires fre
return stroke, said valve pistons being movable
quent attention-if leakage is to be avoided. If
by ?uid pressure to open the ?rst valve and close
the stuffing box is too tight it interferes with
the second valve and the exhaust port on com
proper operation of the valve pistons. If the
pletion of the exhausting of the ?rst-namedend
stuffing box is too loose, there is leakage and loss
of the power cylinder.
_
of pressure fluid. The present arrangement elim
2. A motor, comprising, a power cylinder, a
inates stui?ng box troubles and is much simpler,
power piston reciprocable therein, avalve casing
better and cheaper to make. In such arrange 10 having two valve cylinders of different areas and
ment, the valve casing has to be made slightly
a chamber connecting the confronting ends of
longer than that shown in the aforesaid pending
said cylinders and having a side opening con
application but there are no parts of the valve
fronting a portion of the periphery of the power
mechanism which project above the casing and
cylinder, an inlet for pressure ?uid into the
the overall height or the complete unit is sub
other end of the smaller cylinder, a conduit con
stantially less than that of said application. The
necting the other end of the larger cylinder and
width of the valve casing is made less by intro~
one end of the power cylinder, the latter having
ducing the pressure ?uid into the upper valve
near its other end an opening in its periphery
cylinder through a passage which leads through
confronting said side opening, valve pistons one
in each valve cylinder with a part rigidly inter
the ?ange of the valve casing and axially into
connecting them and extending through said
the upper valve cylinder. The unit is smaller,
lighter, easier and cheaper to manufacture as
chamber, a ?rst valve on the smaller valve piston
for opening and closing communication between
well as giving better service and longer life. It
may conveniently be supported by bolting its up
said inlet and the smaller valve cylinder, a second
valve on the larger 'valve piston for opening and
per end to head 3. The valve unit is easily re
closing communication between the larger Valve
movable if and when required, simply by remov
cylinder and said conduit, the ?rst valve being
ing the two cap screws 33 and disconnecting the
closed when the second valve is opened and vice
coupling t5. There is only one pipe “connection
versa, the larger valve cylinder having an ex
which needs to be disconnected, the other con
nection to the valve casing being made auto 30 haust port opened and closed by the larger pis
matically when ?ange 3!} is fastened to boss 3! by ’ ton when the second valve is respectively opened
and closed, the second valve and said valve pis
the cap screws 33.
tons having a passage ,therethrough opening into
I claim:
the smaller valve cylinder between its valve pis
1. A motor, comprising, a power cylinder, a
power piston reciprocable therein, a valve casing I‘: ton and the ?rst valve, whereby when the ?rst
valve is open and the second valve is closed pres
having two valve cylinders of different areas and
sure ?uid can ?ow to the power cylinder without
a chamber connecting the confronting ends of
entering the larger valve cylinder and move the
said cylinders and having a side opening con
power piston in one direction; means connected
fronting a portion of the periphery of the power
with said pistons and extending through said
cylinder, an inlet for pressure ?uid into the other
openings into the other end of the power cylinder
end of the smaller cylinder, a conduit connect
and engageable by the power piston near the end
ing the other end or" the larger cylinder and one
of its power stroke to move the valve pistons
end of the power cylinder, the latter having near
su?iciently to initiate the movement of the sec
its other end an opening in its periphery con
fronting said side opening, valve pistons one in " ond valve from its seat, thereby enabling pres
sure ?uid to enter the larger valve cylinder and
each valve cylinder with a part rigidly intercon
acting on the larger valve piston to suddenly move
necting them and extending through said cham
the valve pistons and close the ?rst valve and
ber, a first valve on the smaller valve piston for
open the second valve and the exhaust port; and
opening and closing communication between said
inlet and the smaller valve cylinder, a second ‘ engageable by the power piston near the end of
its return stroke to initiate the movement of the
valve on the larger valve piston for opening and
?rst valve irom its seat, thereby enabling pres
closing communication between the larger valve
sure ?uid to enter the ?rst valve cylinder and
cylinder and said conduit, the first valve being
acting on the smaller valve piston to suddenly
closed when the second valve is opened and vice
versa, the larger valve cylinder having an ex- '
move the valve pistons to open the first valve
and close the second valve and the exhaust port;
and means for moving the power piston on its
haust port opened and closed by the larger pis
ton when the second valve is respectively opened
and closed, the second valve and said valve pic
return stroke.
of the second valve from its seat, thereby enabling
pressure ?uid to enter the larger valve cylinder
and acting on the larger valve piston to suddenly
move the valve pistons and close the ?rst valve
valve cylinder, the ?rst valve being closed when
the second .valve is opened and vice versa, the
larger valve ‘cylinder having an exhaust port
opened and closed by the larger valve piston when
3. A motor, comprising, a power cylinder, a
tons having a passage therethrough opening into
the smaller valve cylinder between its valve pis 60 power piston reciprocable therein a valve casing
having two vertically-disposed valve cylinders of
ton and the ?rst valve, whereby when the first
diirerent areas and a chamber interconnecting
valve is open and the second valve is closed pres
their confronting ends, an inlet for pressure ?uid
sure ?uid can ?ow to the power cylinder with
into the other end of the smaller valve cylinder,
out entering the larger valve cylinder and move
a conduit connecting the other end of the larger
the power piston in one direction; and means
valve cylinder to one end of the power cylinder,
connected with said pistons and extending
interconnected valve pistons in said valve cylin
through said openings into the other end of the
ders, a ?rst valve on the smaller valve piston
power cylinder and engageable by the power pis
to open and close said inlet, a second valve on
ton near the end of its power stroke to move the
the larger valve piston to open and close com
valve pistons su?‘iciently to initiate the movement
munication between said conduit and the larger
2,405,949
8
the ?rst valve is respectively closed and opened,
the second valve and said pistons having a pas
sage therethrough opening into the smaller valve
cylinder between the smaller valve piston and
said inlet, whereby when the ?rst valve is opened
and the second valve closed, pressure ?uid can
enter said end of the power cylinder without
entering the larger valve cylinder and move the
power piston in one direction; means operable
by the power piston when it nears the end of its
stroke in said direction to move the valve pistons
sufficiently to disengage the second valve from
its seat, thereby enabling pressure ?uid to enter
the larger valve cylinder and acting on the larger
valve piston to suddenly move the valve pistons
to close the ?rst valve and open the second valve
and the exhaust port, means for moving the
power piston on its return stroke; said valve pis
tons being movable by pressure ?uid to open the
?rst valve and close the second valve and the
exhaust port on completion of the exhausting of
the power cylinder, said ?rst-named means in
cluding a part connected to said valve pistons in
said chamber, and a spring in the larger valve
the power piston nears the end of its stroke in
the other direction to engage said part and move
the same and the valve pistons suf?ciently to un
seat the ?rst valve, thereby enabling pressure
fluid to enter the smaller valve cylinder and act
ing on the smaller valve piston to suddenly move
the valve ‘pistons to open the ?rst valve and close
the exhaust port and the second valve; means for
moving the power piston on its last-named stroke,
and a spring in the larger valve cylinder acting
on the larger valve piston for supporting and
counteracting the action of gravity on the valve
pistons, their valves and said part.
5. A motor, comprising, a power cylinder in
cluding a pair of heads and a barrel therebetween,
a power piston reciprocable in said cylinder, a
valve casing having two valve cylinders and a
chamber connecting their adjacent ends, said
chamber and said barrel having confronting
openings, an inlet for pressure ?uid into the other
end of one valve cylinder, a conduit connecting
the other end of the other valve cylinder to one
end of the power cylinder through one head
thereof, said conduit including a coupling with
separable parts, the ?rst-named valve cylinder
cylinder acting on the larger valve piston for
supporting and counteracting the action of grav
ity on the valve pistons, their valves and said
being removably secured to the other head, valve
means reciprocable in said valve cylinders and
part.
having an actuating part extending laterally
through said openings and into the path of the
4. A motor, comprising, a power cylinder, a
power piston reoiprocable therein, a valve casing
having two vertically-disposed valve cylinders of
different areas and a chamber interconnecting
their confronting ends, an inlet for pressure ?uid
into the other end of the smaller valve cylinder,
a conduit connecting the other end of the larger ;
valve cylinder to one end of the power cylinder,
interconnected valve pistons in said valve cylin
power piston; said valve casing, valve means and
part being removable laterally as a unit on dis
connection of the casing from the second-named
head and disconnection of said coupling.
6. A motor, comprising, a power cylinder in
cluding a pair of heads and a barrel therebetween,
a power piston reciprocable in said cylinder, a
valve casing having two valve cylinders and a
chamber connecting their adjacent ends, said
ders, a ?rst valve on the smaller valve piston to
chamber and said barrel having confronting
open and close said inlet, a second valve on the
larger valve piston to open and close communica ll) openings, an inlet for pressure ?uid into the other
end of one valve cylinder, a conduit connecting
tion between said conduit and the larger valve
the other end of the other valve cylinder to one
cylinder, the ?rst valve being closed when the
end of the power cylinder through one head
second valve is opened and vice versa, the larger
valve cylinder having an exhaust port opened and
thereof, and valve means reciprocable in said
valve cylinders and having an actuating part
closed by the larger valve piston when the ?rst
extending laterally through said openings and
valve is respectively closed and opened, the sec
into'the' path of the power piston.
ond valve and said pistons having a passage
7. A motor, comprising, a power cylinder in
therethrough opening into the smaller valve cyl
inder between the smaller valve piston and said
cluding a pair of heads and a barrel therebetween,
a power piston reciprocable in said cylinder, a
inlet, whereby when the first valve is opened and
valve casing having two Valve cylinders and a
the second valve closed, pressure ?uid can enter
said end of the power cylinder without entering
chamber connecting their adjacent ends, said
the larger valve cylinder and move the power
chamber and said barrel having confronting
piston in one direction; a part connected to said
openings, an inlet for pressure ?uid into the other
valve pistons in said chamber and extending into
end of one valve cylinder, a conduit connecting
the other end of the power cylinder, means mov
the other end of the other valve cylinder to one
able with the power piston and operable when
end of the power cylinder through one head
thereof, valve means reciprocable in said valve
the latter nears the end of its stroke in said di
cylinders and including a lever pivotally mounted
rection to engage said part and move the same
and the valve pistons su?iciently to unseat the
at one end in said chamber and extending later~
second valve, thereby enabling pressure ?uid to
enter the larger valve cylinder and acting on the
larger valve piston to suddenly move the valve
pistons to close the ?rst valve and open the second
valve and the exhaust port, and operable when
ally through said openings into the path of the
power piston and connected intermediate its ends
to move said valve means.
ALFRED L. omen.
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