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Патент USA US2408313

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7 Sept. 24,1;l946. a
, 2,408,312- .
Filed Nov. 5, 1943
2 Sheets-Sheet 1
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Patented Sept. 24, 1946
mass ooNrnoL‘
‘Leslie S. Hubbert, Mount (iileadyOhio, assignor
to The Hydraulic Development? ‘corporation,
Inc., Wilmington;lDe1., a, corporation of ‘Dela
Application'November 5, 194:3! Serial
whims- (Ci-‘159452?
:This invention relates generallyv to vhydraulic
the Qtherside by the conduit l9 tov the conduit
[1. jfThépu’in'p'iliis adapted to ‘draw fluid from
thetank'2uithrough the conduit ‘21' and to expel
it, art'liincreased ‘pressure; ‘into the conduit‘ 22
which-joins through the check valve 23 with the
presseslandhas for its primary object the pro?
vision ofja manual and, automatic control link
age" whereby it is possible'accurately to control.
the rate of travel and position of the press platen
during ‘its reciprocation to and from the‘work. ~
1 conduit j'l'6, jand‘thr‘ough the check valveTM with
In many classes of work, such‘ asbendingand
v the 'conduiti?.‘ The conduit 22‘further comprises
a‘ relief lvalve ‘25? which isl- adapted, upon the
accomplishment" _'of5 a *'predetermined pressure
straightening and some forging operations,‘ ‘it -is
desirable .that the press platenber'lunderlthe
,within'thé conduit 22, to establish a fluid connec
control of the operator at ‘all times 'both?asto
position and ratepf travel., Particularly in the ‘ i tionetfrom'v-the conduit 22 2through the conduit
26 ‘back to the tank '20. >Valvé‘251is preferably a
straightening of shafts and similar objects" pre
cise ‘positioning’ of the press platen. relative 'to
the work is essential; 1111 an operation of this
type, ity is also, desirableithat the operatoribe
low pressure relief valve and serves to discharge
able to retract the platen’ from the work a short
distance inorder to gage the work piece ‘or insert
a new one as the'case’niay be.
' '
"and tha'jllnction Of- conduits'fl? and IS,’ a
' j
pump; l 57in the operation ofi‘the' press.
The conduit 16- 'nclude'sglbetween the cylinder
valve'fzfllT Thi's’mvalve, which is-"an ‘unloading
By‘ means of the control system of this inven
tion,‘ it is possible to ' accomplish ‘these ‘results
thefexcessfdischarge ofithefpump‘ ‘l5 when. it
isrunotiide's'iredji to ‘utilize the’ full flow from the
oripilot bperat'ed relief ‘valve, is for the". purpose
T- .of discharging the fluid above the ram l3 to‘ the
tankduringthe‘retraction stroke. This'is neces
The foregoing will be more apparent upon ref
erence to the following detailed description taken
‘saérybecause the amount of'i'fluid'discharged
from bove'the ram ‘during the retraction stroke
in connection with the, attached drawings. in
25 is i excess of- the’ amount introduced intoI-the .Figure 1 is a rather diagrammaticiview of a v cavity" beneath thei'ra'm during‘!- the r retraction
stroke]; The valve 21 connects-through"the‘ con
du'it 28 ans the low'pressurefrelief valve 29 with
hydraulic press having a control'system embody
' ing this invention.
Figure '2 is a view of one form of hydraulic
system. adapted to be controlled by. this“ control
1 "
the cOnduiE’Y'I-T-atflone end and into the’ pilot
'cylinder'of thev'alv‘ei? at its opposite end.
‘Figure 3 isa wiring diagram of the electrical
system associated with this'control.‘
the tank 201” A' pilot'lin'e '30, the function of
which isto‘ operate" the valve 21,‘ is connected‘to
Theilowjpressure relief valve 029 in the conduit.
285s ‘for. thepurpose 'of maintaining su?icient
i '
‘ Referring to the drawings more in detail, and
in particular to Figure 1,,the hydraulic "press
shown therein comprises a frame memberigen-i ‘i
erally indicated at I0 "having bed‘ portion .at
and carryin'ga press cylindervat l2;
pressure Within'Tthe conduit 128 to maintain the
hydraulic system completely‘ ?lled at’ all times.
Referring again to Figure’ll, more particular
reference will be made tofthe previously men
tioned control systemf~ " “
VReciproca'bly mounted withinithe ,cylinderjrlz
is a press ram or'platen l3 adapted to move into 40 tThis‘I system-9 comprises a screwv 3| .which
and out of engagement’ with the ‘Work as ‘deter- :5
mined by the operator.‘
Mounted within the press frame ‘I 0‘ are’hydraui- ’
llc pumps I4 and'_l5, the. former being: a vari
able delivery pump and thefla‘tter-being a con 45
stant delivery pump. These pumps‘ are connected
througha suitable networkof conduits ‘with-the
conduits l6 and I1, which; last ‘mentionedvcon
threads‘ ‘through an ‘arm! 32 carriedlby the‘. ram 1 3.
The screw 3! is journalled in the press frame Ill
as1§ati$33*and passes through the gear box 34 of
the "motor 35 'within'which-itis suitably splined
or "slidably .keyed to the low' speed output 'gear
of the gear b0X.'.. Th'e;lower end .of the screw 3|
is splined‘ as at .36 and carries a similarly splined
bevelgear, 31.7 {The screwi3l also has pinned
thereto alpaireof collars 38 which are adapted,
50 vvas indicated in Figure '1, to engagethe end of a
bell crank lever- 39'by means‘ of ‘which the valve
ram 13.
delivery pump. lll'l'is' "shifted; .The. lever 39 is
Referring now to Figure-2, the aforementioned
pivotedcatlll on :the'jpress frame‘ or any other
hydraulic system is more completely illustrated.
In this view the pump I4 is connected‘on one
“ ' ' ' bevel gear 4!,
duits serve'to ‘conduct?uid to-"theinte'rior of
the cylinder'l2 and whereby to reciprocate-the
Sid? RY the conduit '8 to its .eenduit, 'tfaed on
tion of the motor 35 is effective to rotate the
screw 3! through the gear box 34. Rotation of
which latter gear is pinned to the shaft 42. The
shaft 42 extends leitwardly from the gear 4|
towards the front of the press and has pinned
or otherwise suitably affixed to its left end the
clutch member 43.
the screw 3| causes it to thread upwardly
through the arm 32 and, by means of the collars
38 causes the bell crank 39 to shift the pump I4.
The shifting'of the pump I4 causes ?uid to be
In engagement with the clutch-member“ is a
delivered into the conduit. I8 and thence through
mating clutch member 44 splined or keyed in any
the conduit I6 into the chamber within the cyl
inder I2 and above the press ram I3. Fluid is
wardly through the wall of the bed Portion IIW10. also withdrawn from beneath the ram I3 through
of the frame In and has aiiixed to the end there-r“ ~ the conduit I1 and conduit I9. The press ram
I3 moves downwardly due to this ?uid transfer
of and outside of the press bed thehand :wheel
and carries with it the arm 32. Downward
46. A pinned collar or other suitable means such ;
other suitably slidable manner to the right hand
end of a shaft 45. The shaft 45 extends lefts- :1
movement of the arm 32 tends to move the
15 screw 3| downwardly to offset the previously
as indicated at 41 retains the shaft 45in its prop.- . 4
er position in the press bed.
mentioned upward movement of the screw 3|
The previously mentioned clutch members 43 _
and 44 comprise a magnetically operated clutch,“ ‘ irelativelyi to the arm 32. It will be apparent
actuation ofv which is effected through the lever? ‘ that‘ the'rate of movement downwardly of the
press ram I3 and attached arm 32 will be equal
48, the solenoid 49 and the spring 59. The lever
48 is pivoted at 5| and is adapted,v when the sole-7
noid 49 is energized torotate clockwise there
upon and bring the clutch members 44 and 43
20 to the rate at which the screw 3| threads up
ward through the arm;32.' For this reason, the
pitch of the screw 3| and’ the rate at which it‘ is
driven ‘aredependent upon the rate atiwhich
Upon V deenergization
the pumps I4 and I5'can supply ?uid to cylinder
of the solenoid 49 the spring 59 is effective to
rotate the lever 48- counter-clockwise about-the 25 I2.._ The maximum rate atwhich the screw 3|
threads upwardly through the arm 32 ‘must be
pilot 5| and thereby to move the clutch member
equal to the maximum rate at which the'ram I3
44‘ away from the clutch member 43 thus de-,-_
descends due to the aforementioned transfer of
stroying the driving connection therebetween. 1
?uid to and from thecylinder I2 by ‘the pumps
The motor 35 is adapted to drive the. screw 3|
‘ I
through the gear box whereby to cause recipro so I4 and I5.‘
The‘v button 54 is held closed by the operator
cation of the press platen in 'avmanner herein
until the ram I3 approaches the work at which
after described.
time the button 54 is’ permitted to open and ‘the
1 Referring now ‘to Figure 3, there is illustrated‘
press ram halts. During this ‘portion of the for-_
the electric circuit employed to energize the mo
ward stroke, which is‘ conducted at relatively
tor 35 and the clutch solenoid 49. The circuit
high speed, 'the action of .the hydraulic circuit
shown in Figure 3 comprises the electric mains
illustrated in Figure 2is as follows:
52 and 53 connected, between ;which.are the
_ The pump I4 is shifted, by means of the bell
branches including the push buttons, contactors,
crank‘39jto fdeliver fluid into the conduit, I8 and
solenoids and motor which comprise the electric
40 thence, by means of the conduit I6, 'into the
chamber above the press ram I3. The pump I4
"I‘hev ?rst branch-line contains a push button
also vdraws ?uid ‘through the conduit I9 and H
54 and a contactor solenoid A. _ A second ‘line
into‘ ‘driving engagement.
from beneath therp'ress ram I3. , The, weight of
includes clutch solenoid 49v and the normally
the ram I3 and the associated partsis sufficient
to cause-the moving parts of the press to‘ descend
as rapidly as ?uid is’ withdrawn from the cyl
normally open contactor blades _A2. In parallel
inder I2 through the conduits I7 and I9. Dur
with A2-and 'alsoconnected- to the motor is a
ing this part of theforward stroke, the pump I5
branch containing the normally open contactor
:.:; delivers I. fluid through the check valve 23 into
blades B2. A last branch line includes thecom
ta'ctor solenoid B and the push button55. ‘
50 the conduit I6 and thereby makes up the dif
ference between the amount of ?uid withdrawn
The motor 35 is of the well known electrically
from beneath the ram, by the pump I4and the
reversible type and‘ is adapted,- when- energized
amount of ?uid required to ?ll the cavity above
by ‘the means of the mains 52 and 53 through
the blades A2 to rotate in one‘ direction, and
.Also, withdrawal of ?uid from the cylinder I2
when energized through the bladesBZ to rotate
through the conduit I'| will cause the‘pressure
in the opposite direction.
therein to‘bereduced to such as value that the
valve 21, piloted by this pressure, will close. The
closed contactor blades AI ; and BI.
The third
branch line includes a vmotor '35 and apairoi '
’ Assuming that the press ram is in'the position
closing of the valve. 21 seals off the ?uid con
shown in Figure '1, and‘that a work piece,v as
indicated by the dot-dash lines,‘ is resting on
the press bed, a work stroke will 'beinstituted
nection between the conduits- I 6 and '28 and
thereby directs the dischargeof .pumps' I4 and
I5 directly into the cylinder I2 above the ram.
As previously mentioned,‘ when the press ram
by the operator by‘pressing the‘push button 54.
approaches the work the push button 54 is per
Closing of the push button 54 will energize the
contactor solenoid A. Energization of the con 65 mitted to open thereby deenergizing the ‘con
tactor solenoid A and opening the contactor
tactor solenoid A causes the normally closed
blades A2.;to stop the motor 35.- Deenergization
blades‘ Al to open and the normally open blades
of the contactor solenoid A also '7 permits the
A2 to close.‘ The opening of the blades AI de
energizesthe previously energized clutch, solenoid » ~
blades AI toclose thereby energizing theclutch
49 and the'closing of the blades A2 energizes the 70 solenoid 49. The operator may now control the
movement of the press ram I3 by rotation of
motor 35 to rotate in one'dire'ction.
.7 '
' The deenergization of the clutch solenoid 49
permits the spring 59 to open, the clutch thereby
disconnecting the driving connection'between
the hand wheel 46 and the screw 3|.
The rota
the hand wheelv 46 as follows:
Rotation of the hand Wheel 46 is communis
oated, by means of the shaft 45, the now'engaged
75 clutch members 44 and 43 and the shaft 42 into
the bevel Fg'ear -4I. :Rotationi ~ofuthejbevelo.gear
4I' causes Jrotati'onfof ‘the mating b'evelig‘eari31
which, through ' its 'splin'edi connection therewith,
rotates the screw 3|. liInwthe'm'anneridescribed
above, in c‘onnection'with ‘automatic rotati'onuof
the-screw, manual rotation of the s‘crewi3l ‘:will
cause a ‘corresponding reciprocation of Ftheiiranrl
I3. Theram I3>is therebyireciprocatedibyjaima
nipulation ofithe. hand wheel ‘46 ate io'ccupy any
means-of the ‘hand wheel 4:6 when “and >,_onlyv
when,"'thegmdtor 335 ‘is *deenergized.
It‘will be obvious that, due togth'e naturezof
thepump I4,..the e?ectof'the screw'3l is to. give
a micrometer’adjustment of the .rplatentposition.
That ' is, ' the v‘rate of reciprocation :of 113116 platen
is dependent upon the‘amount 'by'whichztherpump
I4'is ‘shifte‘d'on to stroke, and’thatithe'ia'mount
that the pump I'4t-is shifted'isfin turn dependent
upon thespeed' of rotation of a'screw“3l. '
> For "example,
desired by
in the
straightening‘:' ' ‘of Ira fJshaft,
‘It is furtheriapparent that the i?owo‘regulating
it might befdesireii t'o'imove the éplaten.l3ilinto
engagement ‘with ‘they work, "to ‘further force'the
platen under pressure‘ ‘into the work, andith'en
means. need. not necessarily ‘consist .of .ga ;va-ri-'
to retract the platen slightly away from the work
in order to-gage onother'wise measure‘ the effect
produced. Having caused the platen to approach
the work under high speed, this is readilyaccom
plished by means of the manual control at 46.
able»delivery_.pump but could aswellzconsist..-o-f
a iifour v‘way valve.- connectedv ‘with :the :screw' 31
eithergdire‘ctly l‘orifthroiighl linkage. similar to the
It will be understood that I do not
.. . desire my
invention to be limited to the particular structure
shown in the drawings but desire to compre
Retraction of the ram from the work to the 20 hend such modi?cations as may come within the
spirit of the invention and the scope of the ap
position indicated in Figure 1, or any intermedi
ate position, may be accomplished at relatively
pended claims.
high speed by the closing of the push button 55.
The closing of the push button 55 energizes the
Having thus fully described my invention, what
the blades BI deenergizes the clutch solenoid 49
and permits the spring 50 to open the clutch as
previously described. The closing of the blades
source of pressure ?uid, means forming a hy
draulic circuit connecting said source with said
'I claim as new and. desire to secure by Letters
contactor solenoid B and thereby causes the 25 Patent is:
1. In a hydraulic press, a press platen, ?uid
normally open blades B2 to close and the nor
motor means for reciprocating said platen, a
mally closed blades Bl to open. The opening of
B2 energizes the motor 35 to rotate in a direc
tion opposite to that caused ‘by the closing of
the blades A2. The rotation of the motor 35
drives the screw 3| in a direction to thread down- ,
wardly through the arm 32.
Movement of the
screw 3| downwardly through the arm 32 causes
the collars'38 to move the bell crank 39 to shift
the pump I4 on stroke. The pump I4 now draws
?uid in through conduit I8 and discharges ?uid
through conduit I9. The ?uid discharge into
the conduit I9 is conducted by means of the con
duit I'I into cylinder I2 and mneath the press
ram I3.
The passage of ?uid through the conduits I9
motor and including control means for varying
the rate of ?uid ?ow, a rod threadedly engaging
said platen for movement therewith and includ
ing means operatively connected with said con
trol means, a reversible electric motorslidably '
keyed to’ one end of said rod selectively operable
for rotating the said rod in either direction,
manual means slidably keyed to the opposite end
of saidrod extending to the operator’s position
and operable to rotate said rod in either direc
40 tion, normally open switch means selectively op
v erable to energize said motor to operate in either
‘direction, electrically actuated clutch means be
tween said rod and said manual means operable
when energized to disengage said manual means
and I1 into the cylinder I2 causes an increase in 45 from said rod, and contactor means connected
to be energized by said switch means and hav
pressure in the conduit I‘! which is communicated
ing contactor blades in circuit with said motor
and said clutch means for positively deenergiz
ing said clutch means simultaneously with the
the conduits I6 and 28, and the ?uid expelled 50 energization of said motor.
2. In a hydraulic press, a platen, a ?uid motor
from above the press ram I3, in excess of the
for reciprocating said platen, a variable delivery
amount required to ?ll the cavity beneath the
pump connected to supply said motor, ?ow con
press ram I3, is passed through the conduit 28
trol means operable to control the rate and di
and the low pressure relief valve 29 to the tank
20. During this retraction stroke the pump I5 55 rection of the ?uid supply from said pump to
said motor, a threaded rod threadedly engaging
is either discharging through the relief valve 25
said platen in a direction substantially parallel
to the tank or through the check valve 23, valve
to the path thereof, an electric motor slidably
21, conduit 28 and relief valve 29 to the tank.
keyed to the upper end of said rod for selectively
It will be apparent that the retraction area
rotating the same in either direction, manual
of the press ram I3 is of suf?cient size that the
means slidably keyed to the lower end of said
full delivery of the pump I4 is su?icient to cause
rod and extending to the front of the press to
upward movement of the press ram to be equal
the operator’s position for manual actuation of
to the maximum rate of downward movement of
said rod in either direction, means on said rod
the screwv3l as the screw threads downwardly
65 between the ends thereof for engagement with
through the arm 32.
said ?ow control member whereby movement of
It will be noted that the clutch solenoid 49 is
said rod in the axial direction is operable to ad
adapted to be continuously energized so long as
just the rate of ?ow from said source, normally
the contactor blades AI and BI are closed. The
open switch means adapted for selectively en
energization of either of the contactor solenoids
A or B is eifective to render inoperative the hand 70 ergizing said motor to run in opposite directions,
normally open clutch means between said manual
wheel 46. This is a safety feature insuring that
means and said rod, and a solenoidv adapted,
there is never a driving connection between the
when energized, to move the clutch to closed po
screw 3| and the hand wheel 46 when the motor
sition, said solenoid beingconnected to be ener
35 isrenergized to drive the screw 3| at high
speed. It is possible to move the screw 3| by 75 gized when said motor is de-energized and to be
through, the pilot line 39 to the pilot cylinder
of the unloading valve 21. The valve 21 is thus
caused to establish a ?uid connection between
tie-energized when ‘said motor is energizedv
slidable key means interconnecting said motor
whereby said'manual means is always discon
nected when'said motor is operating.
and said rod, a bevel gear slidably keyed to the
lower end of said rod, a second bevel gear in
'3. In a hydraulic press, a press frame, a
plunger reciprocably mounted in ‘said frame, a
reversible variable delivery pump for supplying
mesh with said ?rst mentioned gear, a shaft ex
tending from said second gear through said press
frame to the operator’s position, manual means
?uid to said plunger control means movable to
for turning said shaft, clutch means for con
vary the rate and direction of delivery of said
necting the manual means to the shaft and nor
source for controlling the movement of said
mally urged to disengaged position and having
plunger, an arm carried by said plunger includ 10 electrical means adapted when energized to move
ing a threaded bore, a threaded rod slidably
the clutch to engaged position, and circuit means
mounted in said frameand engaging said bore,
interconnecting said electrical means with said
linkage interconnecting said rod andsaid con
motor‘ and so arranged that when either is en
trol means for moving the latter in unison with
ergized the other is de-energized.
the former, a reversible electric motor mounted 15
in said frame adjacent .the upper end of said rod,
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