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Патент USA US2134673

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Oct. 25, 1938.
2, 134,673
»Filed March 5, 1930
‘ ,Bai
5 sheets-sheet 1
Oct. 25, 193.8.
Filed March 5, 1950
5 Sheets-Sheet 2
Oct. 25, 19318.
Filed March 5, 1950
5 Sheets-Sheet 5
oct. 25, 193s.
2 1 3 46, 73
Filed »March 5, 193')
5 Sheets-Sheet 4
Oct. 25, 19318.
Filed March s, ‘1930
5 sheets-sheet 5
Patented oca-'25, 193s
George J. Russell, Waltham, Mass., assigner ofl
l l(Tile-half to lEverett S. Emery, Lexington,
Application March 5, 1930, Serial No. 433,491 ‘
3 Claims. (Cl. 60-52)
'I'his invention relates to hydraulic means for
system; and also to improve the construction and
imparting a back and forth, intermittent, or re
arrangement of parts of apparatus, of this char- -
ciprocatery motion to a member and to means for
effecting such movements atldifferent rates of
In the drawings:
speed on the working and return strokes of
Fig. 1 is a top plan view of a breaching ma-
various machines such for example as on the
cutting and return strokes of_ breaching ma-
Fig. 2 is also a plan view of a portion of the
apparatus shown in Fig. 1, but showing the parts
' In many types ef machines itis advantageous"`
to use one or more power cylinders for advancing and returning a tool or other instrumentality.
A reversible or other type of pump may be pro-
in different relative positions;
Fig. 3 is a longitudinal vertical section of the> 10
machine with the pilot withdrawn and the other v
vided for supplying pressure ñuid to the cylinders
parts arranged as lshown in Fig. 2;
Fig. 4 is a section taken substantially along the
and in such cases it is more economical to use-a
line 4-4 of Fig. 1 with the parts arranged as
pump having approximately the capacity re-
shown in Fig. 2;
quired to make the working stroke at the desired
speed. However when this is done the pump,- due
toits limited capacity, can only effect the return
\ stroke at approximately> the same speed as the
20 working stroke. This procedure results in a considerable loss of time and -the desirability of
speeding up the return stroke will be apparent. v
To remedy this condition Without increasing
the capacity of the pump over that vrequired for
the working stroke, itis proposed to equip the,
cylinders with pistons having unequal pressure
` areas on their opposite faces, the greater area
Figs. 5, 6, and 7 are transverse vertical sections
taken on substantially the same horizontal plane
through the body of the control unit to show the
parts in different relative positions, Figs. 5 and 6
showing diiïerent 'sections of the choke valve, 20
While the latter is shown in elevation in Fig. 7;
Fig. 8 is a section taken substantially along
the line 8-8 of Fig. 5;
Fig. 9 is a section taken along the line 9--9 of
Fig. 7 ;,„and
Fig. 10 is an elevational view of apparatus for
reversinga pump.
being effective on the return stroke, and to proThe features of this invention, Fig. 1, are i1
vide for by-passing ñuid around the piston en
lustrated as embodied in a breaching machine of
the general type disclosed in my prior Patent No.
30 the -return stroke. The delivery side of the pump
is connected toboth ends of the cylinder during
1,431,437, issued January 22, 1924. and also in mv
this return stroke and movement of the piston l copending applicationSerial No. 433,490, filed on
is produced due to the difference in effective areas even date herewith (iSSlled November 21. 1933,’
on the opposite faces thereof. The piston then as Pat. No. 1,936,073). This machine COIIIDI‘ÍSeS
acts as a pump to force iluid from one end of the
a bed I0 which is supported on end pedestals Il
cylinder through the by-pass to the other _end and I2 and is provided with transverse end mem
of the cylinder. The volume delivered 'to the bers I3 and I4 and with longitudinal side members
cylinder, by the combined ilow through the byl5 .and |'7- Intermediate the end members the
pass and from the pump',- is so greatly increased bed is provided with transverse members I8', I9
and 2|, the latter being fitted with an external
40 that the return stroke is very' rapid. In cases
where this system has been empmye'd it has been guide 22 which slidably receives and supports
necessary to slow down the return stroke to a ‘ pieces 0f previously breached SÈOCk 23 in Which
speed far below the maximum attainable speed the rear end of the breaching 19001 24 iS Supported
in order to avoid damage to the apparatus or to During the broaching stroke a pilot 26, in the
auxiliaries due to the high pressures and/or member I9, is advanced to the rightas shown in
`velocities resulting from the combined new and Fia-3. dotted lines. tc engage the rear end cf the
greatly increased volume.
Objects of the present invention are to improve
a system of this kind so that the return stroke can
30 `
breach 24 to hold the latter stationary. 'I‘he
DilOt iS COImeCted 130 the I’Od 271 0f a plunger 28 .
Which is slidable in a cylindrical guide 29, this
be made at greater speeds without damaging> or
„otherwise interferingwith the operation “of the
guide being supported on the transverse member 50
I8. The transverse member I9 carries an exter
- apparatus or with auxiliaries associated with the
nal cuide 3| which slidably receives the pilot 26
apparatus; to provide improved apparatus of this ' and red 2T fOr guiding and SUPPOl’ting the letter
character for operating broaching machines; to during advance and withdrawal of lche pilet- A
guide plate 30 is mounted on the guide 3|.slidably 55
55 provide improved broaching apparatus; to provide improved means for controlling apparatus of ‘ to receive the pilot. The external guide and guide
this general class; to provide for reducing the
plate function t0 keep the pilot Dl‘OperlY centered
number of iittings required for a. system of this
Withrespect to the rear end> of the breach. A
kind; to provide hydraulic apparatus for these
pitman 32, Fig. 3, is plvotally connected to the
purposes and having an improved circulatory
plunger -'M3 and _to 'a crank arm 33, the latter be- 00 «
’ 2,134,073
ing fast on a shaft 34 which is supported in bear
able delivery, reversible iiow pump 1|, Fig. 3,
ings 88 (Fig. 1) carried by the frame. The under
which is driven only in one direction by a suitable
motor 12 through a coupling 13, reversal of flow
side of the crank arm 88, as shown in Fig. 3
is in the form of a sector adapted to engage a rack
31 which is slidable longitudinally on the upper
exterior surface of an auxiliary cylinder 88.
Movement is imparted to the rack 81 by actuating
the auxiliary piston 39 in the auxiliary cylinder,
the piston rod 4| being connected to a depending
10 lug 42 formed on the end of the rack so as to oper
ate the latter. The auxiliary cylinder is pro
vided with ports 43 and 44 for admitting and dis
charging pressure fiuid.
The stock to be broached, Fig. 3, may be posi
tioned manually but is vpreferably delivered
through a chute 46 to a stock carrier or cross-head
41 when the latter is in its withdrawn position
as shown in Fig. 1. The stock may be supported
upon the stock carrier by means of brackets or
20 lugs (not shown) in the manner disclosed in my
aforementioned prior patent, No. 1,481,437, or as
disclosed in my application Serial No. 424,557,
being eifected without reversing the _direction of
rotation of the pump.
The port 58, Fig. 4, in the rod end of each of
the main _cylinders 52 is connected through the
pipe 14, the T 15 and the pipe 11 to one of the
ports of the pump 1|. The port 54 at the head
end of each cylinder 52 is connected through 10
pipe 18 to the other port of the pump and it will
be understood that when the pump is operating
' to denver aum through the connections 11, 1s one
14' to the port 58 the piston 5| will be displaced
from right to left as shown in Fig. 4 and the cross 15
head 41 will be moved to advance stock over the
broach, this being the working or cutting stroke
of the machine. During this stroke fluid will be
discharged from the port 54 through the con
nection _18 to the pump 1|. After the completion 20
of this stroke the 110W will be reversed so that
fluid is delivered through the connection ,18 to
filed January 30, 1930 (issued -April 25, 1933, as the head end 54 of the cylinders 52 and fluid will
Pat. No. 1905,505). The cross-head 41, Fig. 1, is be discharged from the rod end 56 of these cyl
mounted for reciprocatory movement in guide
ways 48 disposed longitudinally along the sidey
It will be observed that the eiiective areaÍ of
members I5 and I1 and motion is imparted to the
the rod end of the piston 5| is less than the ef
cross-head, Figs. 1, 2, 4, ‘by the piston rods 48
fective area of the head end of this piston due
to the space occupied by the piston rod 49. For
which are connected to the cross-head and to
pistons 5| operating in power cylinders 52. As
good economy it' is desirable to keep the capacity 36
shown in Figs. 1 to 4 these cylinders are sup'
of the pump as low as is consistent with good
ported in the transverse end member I4 and in
the intermediate transverse member 2|. The
heads of the cylinders, Fig. 4, are connected byy
performance and assuming that this pump has
suñicient capacity only to advance the cross-head
41 at the desired rate of speed during the work
tension rods 53 in a manner more fully illustrated
ing‘stroke, it will be seen that when the same
volume of fluid is delivered to the head end of
the cylinder to return the cross-head this vol
ume will only be capable of returning the cross
head at a slower rate of speed than that at which
it was advanced. For example if the capacity of 40
the pump were required to advance the cross
head at a speed of approximately 29 feet per
minute the pump, due to the larger volume and
eifective area in the head end of the cylinder,
might only be able to return the cross-head at a 45
speed of approximately 25 feet per minute. In
order to conveniently and effectively accelerate
this return stroke, concentrate the-control of the
mechanism at a convenient point for operation
and repair, and also reduce the amount of pip 50
ing, connections and valves therefor. a control
in my aforementioned application, Serial No.
433,490 (Patent No. 1,936,073). 'These cylinders
are provided with ports 54 and 58 for admitting
and discharging- pressure ñuid for operating the
After the stock has been'positioned ~on- the
cross-head 41 and before the latter is advanced,
the pilot 26 is advanced to the rear end of
broach to take the thrust of the cut during move
,45 ment of the stock over the broach. The front
center 51 is advanced to engage the front end of
the broach for properly centering and support
ing the same. - This center, Fig. 3, is carried by a
center-retaining member 58 which is cylindrical
50 in form and carries an exterior rib 58 which en
Sages an interior shoulder in the cross-head 41
when the latter is in its withdrawn position as
shown in Fig. 1. The center-retaining member
58 is supported for longitudinal movement in a
55 sleeve 6I carried by the end member I8 and held
in fixed position therein by a bracket 62 aiflxed
to the end memher. _The outer end of the cen
ter-retaining member 58, Figs. 3, 1, is enlarged
in the form of a plunger 88 which is slidably
received in the counterbore 84 in the sleeve and
this end of the center-retaining member also
.has a longitudinal bore 86 in which a tubular
member 81 is disposed. 'I'he outer end of the
tube 81 is connected to the bracket 52 and to a
65 pipe connection 88 carried by this bracket. As
fluid is admitted through the tube 51 the center
retaining member 58 will be displaced to advance
the center. The detailed construction and ar
rangement of the parts of this front center is
70 further illustrated in my application Serial No.
424,559, flied January 30, 1930 (issued April 25.
1933, as Pat. No. 1,905,508). Pressure-fluid for
-operating the main power cylinders- 52 as well _as
auxiliary cylinder 88, Fles. 3. 4, and the front
75 center 51 is delivered by a constant speed, vari
unit 88, Figs.~5, 6, 7, is interposed between the
pump and the power cylinders 52;
A connection '
82` extends between this control unit and the port
58 at the rod end of the cylinder 52 and a con
nection 88 also extends -between the control unit
and the port 54 at the head end of the cylinder
52. As shown in Figs. 5, 6 and 7, this control
unit has a delivery passage 84 which affords
communication between the connection 83 and
the connection 18 of the pump. The connection
14- of the pump also extends to this control unit.
The control unit 88, Figs..5, 6, comprises a body
formed preferably of an intermediate section 81
and end sections 88 and 89, the passage 84 being
disposed wholly within the end section 88. The
end section 88 has a delivery passage 9| extend
ing therethrough, the ends of the passage being
closed by plugs 82, 88 which are threaded therein.
A valve ring 84 is threaded .into the passage
against an interior shoulder 85 and provides a
seat for the valve disk 81. A cylindrical wall 88
extends upwardly from the valve disk and is
preferably formed integral therewith. A series
of longitudinally disposed circumferentially 75
spaced slots |00 are formed in the wall 98 to per
mit ñuid to flow freely through this wall. A
valve cage 99 has its `cylindrical lower portion
threaded into the upper end of the cylindrical
wall 98 of the disk 91. Ports |0| are formed in
the cylindrical base portion of the valve cage and
a tubular section connects the base with a plunger
|02 which operates in-a dash pot |03 formed in
i the plug 92. The plunger |02 is provided with
ports |04 and with a central bore |06 which slid
ably receives the stem of the valve |01. The seat
for this valve is formed on the upper side of the
tion and afford communication between these
passages and the passage 9| in this end section. `
'I'he end member 88 is also provided with upper
and lower ports |53, |54 which register with the
adjacent ends'of the passages in the intermediate
section and aiïord the communication between
these passages and the passage 84 in the section
88. The adjacent surfaces of the end and inter
mediatesections 81 to 89 have complementary
interfltting projections |55 which assist in hold 10
ing the various passages in alignment. The end
and intermediate sections may be secured to
valve disk 91, the valve being normally held on ' gether in any approved manner, as by means of
its seat by a spring |08 which is disposed about
the valve stem and seats against the base of the
¿valve cage.
bolts (not shown).
A choke valve |56 is mounted upon the section 15
88 and comprises a body portion |51 which may
A hollow cylindrical extension l|09 depends from
be formed integral with this end section as shown.
the lower side of the valve disk 91 and is reduced
at its lower end to flt within a spring | l I, the up
of the choke valve and a ~right angle passage |59
per end of which seats ' against the shoulder
extends ~between the connection 4|58 and a port 20
formed on the cylindrical extension. 4Ports ||2
are formed in the walls of this extension and a
port || 3 extends longitudinally through the end
thereof for affording communication between the
valve |01 and the passage 9|. An abutment
A pipe connection -|58 extends into the body |51
|6| which affords communication between the
passage 84 and the passage |59. 'I'his passage,
Fig. 9, |59 is enlarged to provide a seat |62 for aone way valve comprising a spherical member
|63 which is normally held on its seat by a coil 25
member ||4 serves as a'seat for the lower end of spring |64. This spring is mounted upon a pin
`the spring ||| and has a cylindrical extension ||6 " |66 carried by a plug |61 which is threaded into
disposed within the spring. This abutment mem
the end of the passage |59. Another passage |68
ber is slidably received in a cylindrical recess I|1 extends from the connection |58 Vand has a re
formed in the plug 93 and is supported in adjust
stricted portion |69 for restricting‘the ñow be 30
ed positions in this recess by engagement with an tween the portV |6| and the connection |58. For
adjusting screw ||8 threaded through the end of convenience of rmanufacture the passage |68 may
the plug. A suitable number of gaskets ||9 are be drilled from the side of the body |51 and closed
disposed between the head of the screw and the with a plug |1| as shown, the restricted portion
L1) plug for preventing leakage at this point, and it
being drilled from the passage 84.
will be understood that upon adjustment of the
The pipe connection |34 on the intermediate
screw one or more of these gaskets may be added section extends to the port 43 at the head end
or removed to regulate and control the pressure ' of the auxiliary cylinder 38 (Fig. 3) and the con
of the'fluid which actuates the front center.
nection |58 on the end section 88 extends to the
The intermediate section 81 is provided with port 44 at the rod end of the auxiliary cylinder, 40
upper and lower transverse or-cross passages. |2|
pressure fluid being supplied through these con
and |22. The upper passage has annular recesses nections, for 'operating the auxiliary cylinder.
|23, |24 formed adjacent the ends thereof and Pressure iiuid for operating the front center is
a. shuttle valve |26 is disposed in the upper supplied through the passage 68 which is con
passage for controlling the iìow of fluid there
nected through the T 16 tothe connection 11 of
through. This valve comprises a rod |21 having - the pump.
oppositely disposed valve disks |28, |29 secured
A fluid reservoir or supply tank |8| (Figs. 1
thereon by means of nuts |»3I which are threaded and 3) is supported upon the transverse mem
upon the reduced end portions'of the rod and bers I8 and I9 of the bed plate and a connection
with a plurality of short, radially extended wings |82 extends between the bottom of this supply 50
|3|A positioned thereon substantially 90° apart tank andthe upper passage |2| of the intermedi
circumferentially of the rod to position and guide ate section of the control unit. This passage | 2|
the rod in the passage |2|. Seats |32, |33 are also has a port |83 and a connection |84 extends i
formed in the upper passage and are adapted to between this port and the pump for permitting
receive the valve disks |28, |29 respectively. A iluid to flow by gravity from the supply tank to 55
pipe connection |34 extends into the annular re
the pump, the supply tank being preferably open
to the atmosphere.
cess |23.
The lower passage |22 is -preferably a straight
Means are also provided for automatically re
cylindrical passage having annular recesses dis
versing the flow of the pump as the cross-head or
posed at the ends thereof to receive the annular stock carrier reaches either end of its stroke. As 60
seats |36, |31 for a shuttle valve |38. This shut
shown in Figs. '1 and 2 a rod |9| is mounted to
tle valve has a hollow cylindrical body |39 which slide longitudinally in bearings |92 supported by
is formed integral with a transverse end wall |4|. the frame. Collars |93, |94 are disposed adjacent
This end Wall has a central port |42 and a. seat the ends of the rods and are preferably arranged
|43 for a one way valve |44, this valve being nor
to be adjustable longitudinally of the rod so thatV 65
mally held on its seat by a spring |46. An annu
they may be heldin various positions. If desired
lar member |41 is threaded into the end of'the set screws (not shown) may be provided for hold-cylindricalbody |39 to provide a seat for the ing these collars in selected positions. An abut
spring |46 and this member |41 is also provided ment member |96, Figs. 1, 2, is mounted upon the
with ports |48, |49 to permit ñuid to ñow freely cross-head 41 in aposition alternately to engage 70
through this portion of the valve body when the one of the collars as the cross-head approaches
valve |44 is in open position. The end section the ends of its stroke. This Iengagement causes .
'89 is provided with upper and lower ports |5|, |52, the rod to move longitudinally in its bearings
which register with the adjacent -ends of the up
per and lower passages-in the intermediate sec
with the cross-head, the arrangement being such
that> the rod is moved to the right as shown in
Flgs. 1, 2 and 3 when the cross-head is moved to piston 5| from right to left and causing the cross- v
its withdrawn position and the rod is also moved _head 41 to advance the stock over the broach
to the left as the cross-head ñnishes its working for the working stroke. As the cross-head ap
stroke. A rack |91 (Fig. 10) is formed on the proaches the end of this working stroke the abut
ment |96 (Fig. 1) will engage the collar |94 and
move the rod |9| to reverse the flow through the
mounted onV a shaft |99 which is rotatably sup- , pump. On this reversal of flow the connection 14
ported in the bracket 200 mounted upon the end becomes connected to the suction side of the pump
member I3 of the' frame. An arm _20I, Fig. 3, is and hence will tend to draw ñuid out of the pas
ñxedly connected to the shaft |99 and the outer sage 9I through ports ||2, ||3 lifting valve |01
end of this arm has a slot which iits over the rod and back to the pump through the chamber 9|“
202, the arm being held pivotally thereon by and the connection 14. The connection 18 is now
round faced nuts 203. In a similar manner the connected to the delivery side» of the pump and
fluid passes through this connection into the pas
longer arm of a bell-crank 204 is pivotally con
15 nected to the lower end of the rod 202 While the sage 84 of the control unit and out through the
connection 83 to port 54 at the head end of the
shorter arm of this bell-crank is pivotally con
nected to a rod 206. This bell-crank is mounted cylinder 52. The pressure developed in the pas
to pivot on the pedestal II. The rod 206 is also sage 84 in the control unit is effective to move
pivotally connected to a _bell-crank 201 arranged the shuttle valve |38 from the position shown in
Fig. 5 to the other end of the passage |22 as 20
to operate a control plunger 208. It will be under
stood that when the rod |9| is moved to one of shown in Fig. 6. Fluid also passes from the pas
its extremepositions the linkage just described sage 84 through the upper port I 53 to the an
will be effective to reverse the flow in the pump nular chamber |24 where it is effective to move
1I and that when the rod is moved to the other the valve disk |29 onto its seat |33, thereby clos
’ of its extreme positions by engagement with the ing this end of the upper passage |2I.
When the shuttle valve |38 has moved to the
abutment |96 the sector |98 will be moved in the
underside of thenrod |9I at the end thereof and
is'engaged by a gear sector |98, the latter being
opposite'direction again to reverse the flow.
In the operation of the apparatus with the parts
position shown in Fig. 6, fluid is permitted to ñow
from the delivery side of the pump through the
arranged and shown as in Fig. 1 fluid is delivered
by the pump through the connections 11 to the T
16 and from this T through the connection 68 to
the interior of the center retaining member 58 to
advance this member. The rib 59 on the center
retaining member however is at this time in en
gagement with an interior shoulder formed in the
connection 18 and the passage |22 to the connec
tion 82 which añords communication with the
port 56 at the rod end of the cylinder 52. Pres
sure iluid is thus delivered to ports at both ends
of the main cylinder 52 but as the head end of
the piston has a greater effective area than the
rod end, the diiîerential pressure will be effective
to move the piston from left to right as shown in
cross-head 41 so that the center retaining mem
ber 58 can not advance until the cross-head has
first moved the stock to be breached on to the
end of the broach.
Fluid is also delivered by the pump from the
connection 11 through the T 16 and the connec
tion 14 to the upper end or chamber 9|a of the
passage 9| in the Icontrol unit (Fig. 6). When
fluid ñrst enters this passage 9|a the valve 91 is
held on its seat by the spring III and the ñuid is
diverted through the port I_5I to the annular re
cess or chamber |23 and th'e pressure of the fluid
of this chamber> acting against the valve disk |28
of the shuttle valve |26 forces this disk against
its seat to close this end of the upper passage I 2| .
Fluid then ñows from the chamber |23 through
the connection |34 and port 43 to the head end of
the auxiliary cylinder 38 and moves the piston 39
from right to left as shown in Fig. 3. This move
ment of the piston 39, due' to its connection with
the rack 31, serves to rotate the crank arm 33 in
Fig. 4 to return the cross-head 41 to the position
shown in Fig. 1. As this movement of the piston
is initiated iluid is forced out of the cylinder
through the portl 56 and back through the con 40
nection 82 into the passage |22 and into the pas
sage 84. It'will be seen therefore that during
this stroke the rod side of the piston 5I acts as
an auxiliary pump to force fluid through the con
nections just poined out from one end of the cyl 45
inder to the other. At vthe same time that the
piston is functioning in this manner to by-pass
ñuid from one end of the cylinder to the other,
the pump may be operating at capacity to deliver
fluid into the passage 84 and into the head end
of the cylinder. This arrangement makes avail
.able a very large volume of ñuid for displacing
the piston on its return stroke and it will be ap
parent that the return stroke may be made very
In such cases it has been found that the cross
a clockwise direction to advance the pilot 26 into , head is returned in this manner with greater
engagement with the end of the broach. By ad
justing the tension on the spring III by means
of the screw I`| 8 the pressure in the auxiliary cyl
inder may be maintained at the proper value to
advance the pilot at the desired rate of speed to
engage the broach before the cross-head is moved.
When the pressure in the upper end of the pas
sage 9|*ì attains a predetermined value the valve
disk 91 will be moved oiï its seat against the action
¿of the spring I I I and fluid will then flow from the
connection 14 through the passages 9|“, 9|, and
through the lower port |52 into the lower passage
|22. On entering this passage the iiuid will move
the shuttle valve |38 to the left as shown in Fig. 5
to close this end of the passage |22 and ñuid will
then flow from the passage |22 through connec
tion 82 to the port 56 (Fig. 4) at the rod end of
the power cylinder 52, thereby displacing the
speed than is required and furthermore the high
pressures resulting from this combined flow and
increased volume are always far in excess of 60
those to which the auxiliary cylinder and -piping
should be subjected.
The use of such high pres- „
sures in this auxiliary cylinder subjects the cyl
inder, the piston and piping as well as the pilot
operating mechanism to unnecessary strain and 65
In many cases where it has been at
tempted to use such pressures in the auxiliary
cylinder the piping has been blown out. Occur
rences of this kind'are avoided with the present
apparatus by the arrangement of the choke valve
|58. It will be seen` that when pressure ñuld is
admitted to the choke valve |56 (Fig. 9) through
the port I6I from the passage 84 the spherical
member |63 will be forced on its seat- to close
the passage |59 and iiow to the connection |58 75
leading to the port 44 will be retarded by the
restricted passage |69.
This assures that lluid at
these higher pressures will be delivered through
the connection |58 and the port 44 to the rod end
of the _auxiliary cylinder at a permissible rate
and hence the parts operated by this cylinder
will function in their intended manner.
It will
also be seen that when th-e piston 39 of the aux
iliary cylinder is moving from right to left as
10 shown in Fig. 3 the pressure of this fluid will move
the spherical member |63 from its seat, Fig. 8,
and normal flow will be permitted through the
passage |59 and the port | 6| to the passage 84
and to the suction slide of the pump.
In order further to assure that damage will
not be caused to the auxiliary cylinder or to the
main cylinder 5| or any of the connections or
parts operated by these cylinders, the one way
relief valve |44 is adapted to'open at such pres
necting the delivery passages, a bleed passage
through said shuttle valve; a shuttle valve in the
upper cross passage closing it between the deliv
ery passages when the flow is in the ñrst deliv
ery passage, while opening the cross passage be
tween the reservoir and the second delivery pas
sage; the valve in the lower cross passage clos
ing the same between the delivery passages to
permit ñow from the ñrst delivery passage to the
ñrst cylinder end; and upon flow reversal said 10
Valve in the upper cross passage closes the con
nection between the delivery passages and con
nects the ñrst delivery passage to the reservoir;
and the valve in the lower cross passage opens
connection between the second delivery passage 15
and the first end of the cylinder, which flow is,
as well, to the cylinder end opposite to said first
end; the bleed passage in the lower cross pas
sage opening when the flow in this reverse direc
tion attains predetermined pressure to permit 20'
flow through the bleed passage to the ñrst de
be bled throughv the shuttle valve |38 into the livery passage.
2. The combination with a power cylinder _and
passage 9| and that the pressures therein will be
eifective through the ports, H2, ||3 to raise the ' a reversible flow pump for supplying pressure
25 valve |01 from its seat, _thereby permitting the fluid to the cylinder, of a control unit compris 25
fluid to be returned to the suction side of the ing a body, means providing separate passages
from opposite sides of the pump through said
pump. Should the pressure of the fluid be de
creased below the" value to which the valve |44 body to opposite ends of the cylinder, said body .
is set to open it will be apparent that .this valve having a passage means connecting said separate
passages, a shuttle valve for controlling the ilow 30
30 will again close.
The function‘of the port |83 in the shuttle through said passage means forclosingone of
20 sures as are considered proper.
It will be seen
from Fig. 7 that when this valve opens fluid may
valve |26 is to keep the inlet of the pump sub
merged through connection |84 (Fig. 3) at all
times so that the pump may be supplied with
35 fluid from the supply tank |8|. It will be ap
parent that fluid is permitted to flow by gravity
from the supply tank through the connection |82
into the‘upper passage |2| and out through the
port |83 and through the connection |84 to the
pump to compensate for leakage and for varia
tion in the quantity ofoil required in the system.
'I‘he shuttle valve |26 is so arranged that it is
always open to alford communication with which
said separate pasages between the pump and the
passage means, and pressure-responsive means
carried by the shuttle valve for bleeding iluid
from the passage means to said separate passage. 35
3. A control unit for connection between a re
versible flow pump, a fluid reservoir and a power
cylinder, said unit comprising a body having de
livery passages through it for connection between
opposite sides of the pump and opposite ends of 40
the cylinder, and having a supply passage for
connection between the lluid reservoir and the
pump, an upper cross passage in the body andv
ever of the passages 14 or 18 happens at that
between the delivery passages constituting. said
rparticular time to be connected to the suction
connection, and a shuttle valve in said cross pas
sage operable by the ñuid pressure in one of the
By arranging the various connections and delivery passages to close said passage to the‘res
valves in the control unit 86 it is possible greatly ervoir; and a lower cross passage between said de
to reduce the number of ñttings required in a ' livery passages with a shuttle valve‘ therein op
erable to permit pressure fluid ilow from one of 50
system of this general character and also to cen
said delivery passages to one end of the cylinder
tralize the various instrumentalities which con
trol the system. In one particular instance the and also, on reversal, flow from the other deliv
number of fittings required were reduced by this ery passages to both ends of the cylinder sirnul
arrangement from approximately 45 or 50 to 17. taneously, and subsequently ñow from one cyl
will also be seen that by forming the body of inder end through said cross passage and through 55
side of the pump.
` -
and 89 the various passages may readily be
said delivery passage to the opposite cylinder
end; said body having auxiliary passages leading
formed by relatively simple manufacturing op
from each of the delivery passages for connec
the control unit 86 of separable sections 61, 88
tion to the opposite ends of an auxiliary fluid
cylinder, one of said auxiliary passages compris 60
ing a plurality of ducts of diiïerent sizes, pres
sure responsive means for normally closing the
I claim:
1. The combination with a pressure -cylinder larger duct, thus restricting the flow through the
having a piston, and a constant speed, reversible smaller duct, and to the auxiliary fluid cylinder,
65 flow pump, and a pressure iiuid reservoir, of a . the pressure responsive means being operable to 65
control unit between and connecting the pump provide for normal ñow from the auxiliary ñuid
cylinder; and means for closing one of the de
and cylinder and having a body, separate deliv
ery passages from opposite sides of the pump livery passages until the pressure in the auxil
through the body to opposite cylinder ends; an iary passage associated therewith attains a pre
determined value.
cross passage between the delivery pas
sages connected also with the reservoir; a lower
erations and the various valves and connections
60 may easily be assembled in operative positions and
are readily accessible for adjustment.
cross passage having a shuttle valve and con
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