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Патент USA US3061705

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Oct. 30, 1962
w. A. RAY El'AL
3,061,695
CYLINDER CONSTRUCTION FOR HYDRAULIC APPARATUS
Filed Feb. 27, 1959
2 Sheets-Sheet 1
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Oct. 30, 1962
w. A. RAY ET AL
3,061,695
CYLINDER CONSTRUCTION FOR HYDRAULIC APPARATUS
Filed Feb. 27, 1959
2 Sheets-Sheet 2 '
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Mun/w H. BAY
Iéq/we B. HEDGEE
INVEN TORS
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United States Patent O??ce
1
3,061,695
Patented Oct. 30, 1962
2
operating auxiliary mechanism, such as an indicator or
3,061,695
APPARATUS
CYLINDER CONSTRUCTION FOR HYDRAULIC
William A. Ray, North Hollywood, and Frank R. Hedger,
Glendale, Calif., assignors to General Controls Co.,
Glendale, Calif., a corporation of California
Filed Feb. 27, 1959, Ser. No. 796,145
4 Claims. (Cl. 200—82)
electrical circuit controllers.
The main support for the hydraulic mechanism 1 is
formed by a frame 6 that may be readily fabricated by
a die casting process, utilizing metal such as an aluminum
alloy. Integrally formed as a part of the frame is a de
pending element 7 having two sides, and adapted to be
bolted or otherwise attached to the top of the valve 2.
The frame 6, as shown most clearly in FIG. 3, has
This invention relates to hydraulic apparatus utilizing a 10 walls 8 and 9 forming a space accommodating between
cylinder and a piston movable by ?uid pressure. The
them a generally circular wall 10 integrally cast with the
piston in turn may be caused to operate an actuator con
frame 6. The wall 10 is joined to the opposite walls 8
nected to a load, such as a valve closure.
and 9 by the aid of four lugs, the bottom ones 11 and
The arrangement is usually such that an electric motor
12 of which are shown in FIG. 3. ‘Corresponding upper
driven pump may be actuated in response to a condition, 15 lugs 13 are provided, one of which is indicated in
such as temperature or pressure. Fluid under pressure
FIG. 4.
supplied through the pump outlet then causes the piston
to move in one direction in opposition to a spring. When
An upwardly tapered recess 14 is de?ned by the in
terior surface of the wall 10. This taper is conveniently
formed by a core, the withdrawal of which from the
the piston reaches its end position, it operates a switch
to deenergize the motor. When it is required to return 20 casting is facilitated by the tapered con?guration of the
the piston to its initial position by aid of spring pressure, a
recess 14.
relief valve is opened, and the cylinder discharges into a
The recess 14 has a bottom surface 15 (FIG. 2) which
reservoir through the relief valve.
is apertured to accommodate the piston rod 4.
‘It is one of the objects of this invention to improve
Urged against this surface 15 is the lower edge of a
in general, apparatus of this character.
In some prior forms of hydraulic actuators, a frame is
provided which may be supported on a valve body. The
frame serves to support a cylinder in which the actuating
piston is accommodated. The motor, pump and the body
of oil or other liquid used by the pump is enclosed in a
container mounted on the frame. A housing for electrical
25 cylinder shell 16. This shell is preferably made of steel
tubing, within which moves a piston structure 17.
‘In order to urge this shell 16 downwardly, use is made
of a cap 18. This cap 18 has a ?ange 19v externally
threaded for cooperation with internal threads 20 formed
in an enlarged aperture forming the upper portion of the
recess 14.
Between this threaded aperture and recess
connections, auxiliary switches, etc. is also carried by the
there is an enlarged cylindrical bore portion 21. An
frame. Usually the cylinder is made as a separate piece,
O-ring 22 carried in a groove in the periphery of the cap
as of ‘steel tubing or iron, and held in place in the frame
18 engages this bore, for sealing off the cylinder.
by aid of a clamping device utilizing bolts.
35
The cap may be appropriately provided with means for
It is another object of this invention to make it possible
facilitating the application of a spanner wrench to turn
to simplify the combination of the frame and cylinder.
it down in the threads 20.
It is still another object of this invention to ensure
A cover plate or nameplate 23 of thin metal extends
above the cap 18.
against the egress of oil to the exterior of the frame, in
a simple and effective manner.
The piston structure 17 includes the piston proper 24
This invention possesses many other advantages, and
into which is threaded the upper threaded end 25 of the
has other objects which may be made more clearly appar
piston rod 4. Appropriate provisions are made to seal
ent from a consideration of one embodiment of the in
the piston in the shell 16. For this purpose, an O-ring
vention. For this purpose, there is shown a form in
26 is located in a groove formed in the periphery of the
the drawings accompanying and forming a part of the 45 piston ‘24 and a pair of Te?on rings 27 extend on either
present speci?cation. This form will now be described
side of the O-ring 26. Similarly, an O-ring 28 extends
in detail, illustrating the general principles of the inven
around the threaded portion 25.
tion; but it is to be understood that this detailed descrip
The piston 24 is resiliently urged downwardly ‘against
tion is not to be taken in a limiting sense, since the
the surface 15 by a compression spring 29 which is held
scope of this invention is best de?ned by the appended 50 in compression by the lower surface of the cap 18. The
claims.
piston rod 4 extends through packing material, including
Referring to the drawings:
.
FIGURE 1 is an elevation of an apparatus incorpo
rating the invention;
-
two sections 30 and a third section 31.
Section 31 is
axially spaced apart from sections 30. All three sections
are urged into a bore 32 concentric with the shell 16.
FIG. 2 is an enlarged longitudinal sectional view of 55 In order to maintain the sections 30 axially spaced from
the apparatus;
the section 3-1, use is made of a washer 33 having ridges to
FIG. 3 is a sectional view, taken along a plane corre
provide radial ports from rod 4 to the bore 32.
sponding to line 3-3 of FIG. 2; and
In order to urge the piston 24 upwardly against the
FIG. 4 is a sectional view, taken along a plane corre
force of the spring 29, use is made of a pump structure
sponding to line 4—4 of FIG. 3.
60 located in a sealed casing 34. The casing serves as a
lIn the present instance, a hydraulic actuator mecha
reservoir for the hydraulic ?uid and it also encloses an
electric motor, the pump, and a relief valve for the pump.
nism 1 (FIG. 1) is indicated as mounted on top of a
When the pump is operated by the motor, oil or other
valve 2 for operating the valve. This valve 2 may be a
hydraulic ?uid under pressure is delivered through a port
?uid fuel valve having a closure operated by the mecha
nism 1 in response to pressure or temperature conditions. 65 35 leading to an annular space 36 below the piston 24.
Oil from above the piston structure is urged outwardly
The operating mechanism includes an actuator 3
through a slot 37 formed in the lower side of the cup
(FIGS. 2 and 4) which is connected to a valve control
18, to the space between the shell 16 and the recess 14.
device for valve 2, such as a valve closure. This actuator
Thence the oil can pass into the casing 34 by connections
3 is carried at the end of a piston rod 4 operated in a
to be hereinafter described.
manner to be hereinafter described. A disk-like structure 70
When the rod 4 is moved in this manner to its extreme
5 is interposed between the actuator '3 and the stem 4 for
upper position, provisions are made for deenergizing the
sparesa
4.
3
of its motion, the disk-like structure 5 moves into en~
gagement with the lower end of the rod 59‘ and moves
it upwardly to operate the circuit controllers 52 and 53.
motor in the sealed casing 34, while maintaining the oil
under pressure underneath the piston 24. This stops
the upward motion and maintains the position of the
One of these circuit controllers is utilized for disconnect
piston structure 17. When it is desired to return the actu
ing the electric motor operating the pump in the casing 34.
The inventors claim:
ator 3 to its lowermost position, as shown in FIG. 2, the
relief valve in casing 34 is opened, and oil is forced
through the port 35 back into the casing 34. This mode of
1. In apparatus of the character described: a frame
having an inwardly tapered recess, said recess having an
operation is now well-known; therefore further recital of
apertured bottom surface; a cylinder shell resting on said
details of such hydraulic actuators is unnecessary.
In this process some oil may leak past the packing sec 10 bottom surface; there being an increasing clearance be
tween the shell and the recess toward the top of the
tion 311 and into the annular space between the sections
recess; means urging the shell ‘against said bottom sur
30 land the section 31. This is apt to occur since the
face; said frame having ports, one to the bottom surface,
space beneath piston structure 17 is subjected to ?uid pres
and one ‘adjacent the top of the tapered recess; and a
sure whether the piston is moving upwardly or down
piston in said shell; said frame having provisions for con
necting the bottom port to the interior of the shell below
the piston; said frame also having provisions for
connecting the top port, via the clearance between the
wardly. The oil leakage past the packing section 31 is
returned to the exterior of the shell 16 via a port 38
to a slot 39 formed in the wall of the recess 14 (see also
FIG. 3). By aid of the structure thus far described, it
is apparent that any leakage of liquid from the shell 16
outwardly at either its bottom or top edges will simply
shell and the wall of the recess, to the top of the shell
and to the space above the piston.
2. In apparatus of the character described: \a frame hav
ing an inwardly tapered recess, said recess having an aper
tured bottom surface; a cylinder shell resting on said
bottom surface; there being an increasing clearance be
return the oil or other liquid to the space de?ned by the
tapered recess 14, and thence to the casing 34.
The casing 34 is supported on the right-hand side of
the frame 6. Thus the casing 34 has a sealing metal
covering plate 40 from which extend four projections 41 25 tween the shell ‘and the recess toward the top of the recess;
means urging the shell against said bottom surface; said
having internally threaded apertures. Engaging these
frame having ports, one to the bottom surface, and one
apertures are the cap screws 42 which pass through lugs
adjacent the top of the tapered recess; a piston in said
shell; a piston rod extending through the aperture in
as 43 for the accommodation of the projections 41.
The screws 42 urge the sheet metal covering 40 against 30 the bottom surface; packing in the frame around the rod,
said packing being in two sections; and means forming
the end surfaces of a pair of bosses 44 ‘and 45 (FIGS.
a passage from between the sections to the port near the
2 and 3.) These bosses have enlarged counterbores ac
top of the recess.
commodating the enlarged cylindrical heads 46 of con
3. The combination as set forth in claim 2, in which
duits leading into and out of the casing 34. The lower
boss 45 is in communication with the port 35 and the 35 the passage forming means includes a slot in the side of
the tapered recess.
upper boss 44 is in communication with a similar port 47.
4. In apparatus of the character described: a frame
This port 47 communicates with the space between shell
having an inwardly tapered recess, said recess having
16 and recess 14, whereby upon movement of the piston
an apertured bottom surface; a wall of said frame de?ning
structure 17 in either direction, liquid ?ows from or into
40 a space exterior of said recess; a cylinder shell resting on
shell 16 via port 47 and slot 37.
said bottom surface; the upper portion of said recess being
In order to provide a tight seal between the heads 46
enlarged and internally threaded; a cap threadedly en
and frame 6, O—rings 48 and 49‘ are provided in grooves
gaging said internally threaded portion and having a
in the bosses 44 and 45.
surface urging said shell against said bottom surface; a
Another casing 50 is appropriately supported on the
left-hand side of the frame member 6. This casing 50 45 piston in the shell; a stem for the piston extending through
11, 12 and 13. These lugs may have counterbores such
the aperture in the bottom surface; one or more switches
may be provided with a wall 51 upon which are supported
one or more circuit controllers 52, 53 (see FIG. 3). Each
of the circuit controllers has a plunger, such as 54 (FIG.
2) operated by a lever structure having an arm 55. This
arm 55 has extensions 56 and 56' passing through narrow '
apertures 58 in the wall 51, for operating auxilary switches
in the casing 50 if desired. The lower inner edge of the
‘aperture 58 serves as a focal point for the lever 55. In
order to urge the lever 55 toward this edge, the lever 55
References Cited in the ?le of this patent
UNITED STATES PATENTS
is urged inwardly and downwardly by the aid of a tension
spring 57, anchored to the lever 55 and to wall 51 by
the aid of appropriate apertures formed in the wall 51.
In order to operate the lever 55 and thereby the circuit
controllers 52 and 53, use is made of a push rod 59
which is guided by the ‘aid of a mounting bolt 60 passing 60
through the lower wall of the frame 6.
Appropriate
means such as a pin 61 may be provided for limiting down~
ward movement of the push rod 59.
When the piston rod 4 is moved upwardly to the limit
supported by the frame in said space, each having an
operating plunger; a lever for moving the plunger or
plungers; said lever being mounted by aid of said wall;
and a push rod guided by the frame and operated by move
ment of the stem toward the top of the recess, for urging
the lever to operate the plunger or plungers.
65
1,068,945
Taylor _____________ .__ July 29‘, 1913
1,141,158
Turner ______________ __ June 1, 1915
2,650,275
2,656,820
2,695,009
2,736,778
2,860,203
Doutt ______________ __ Aug. 25,
Becker _____________ __ Oct. 27,
Sloan ______________ __ Nov. 23,
Buchanan ____________ __ Feb. 28,
Haessler _____________ __ Nov. 11,
1953
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