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Патент USA US2113115

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April 5, 1938.
|-|_ F, MacMlLLlN ET AL
2,113,115
. HYDROMECHANICAL PRESS'Filed May 25, 1954
/30.
4 Sheets-Sheet l
April 5, 1938.
H. F. Mac-MILLIN ET Al.
V
2,113,115
HYDROMECHANICAL PRESS
Filed May 25, >19.1.54»
4 Sheets-Sheet 3
36
37
1
/A/l/E/V TORS
ATTORNEYS
April 5, 1938. '
H. F. MacMlLLlN ET Al.
2,113,115
HYDROMECHANICAL PRESS
Filed May 25, 1934
NìI
4 Sheets-Sheet 4
Patented Apr. 5, 1938
y 2,113,115
UNITED STATES
PATENT oFElcE ’
2,113,115
i
HYDRQMECHANICAL PnEss
Howard F. MacMillin and Don C. Youngblood,
Mount Gilead, Ohio, assignors, by mesne assign
ments, to The Hydraulic Press Corporation,
Inc., Wilmington, Del., a corporation ol' Dela
Ware
Application May 25, 1934, serial No. '127,550
(c1. 10o-11)
3 Claims.
'I'his invention relates to presses, and, in par
ticular, to hydraulic presses having mechanical
connections for the application of hydraulic
power.
Figure 3 is a longitudinal section through the
control valve shown in Figures 1 and 2, but with
the parts in a “reverse” position to produce an
upward stroke of the platen; -
One object of our invention is to provide a
hydromechanical press wherein` the power is pro
duced by hydraulic means but applied by me
chanical connections.
Another object is to provide a hydromechani
cal press having a horizontally-disposed hydraulic>
cylinder-and-piston assembly arranged to move
a vertically-disposed platen, as through toggle
Figure 4 is a side elevation of the press shown
in Figure 1, the control valve being- omitted to
conserve space;
Figure 5 is a vertical section along the line
5-5 of Flgure 1;
15 cal press wherein a hydraulic ram moving in
Figure 6 is a wiring diagram of the control
circuit for the press of my invention;
Figure 'l is an enlarged detail view- showing the
crank shaft and solenoid connections.
General construction. of the press
one direction is caused to move a platen in a
Referring to the drawings in detail, Figure 1
or crank connections therebetween.
Another object is to provide a hydromechani
_direction perpendicular thereto.
' shows a press having a base l and a top piece 2
Another object is to provide a hydraulic press
having mechanical means for adjusting the maxi
20 mum position reached by the platen during oper
ation.
'
Another object is to provide a hydromechani
cal press wherein an adjustable wedge is used
to regulate the position reached by the platen
25 in its motion.
Another object is to provide a hydraulic press
having a hydraulic cushion in one of the press
ing surfaces, this cushion embodying means for
stopping or reversing the action of the press
30 when the pressure upon the cushion reaches a
predetermined amount.
Another object is to provide a hydromechani
cal press with a hydraulic cushion in one of the
pressing surfaces thereof, together with an elec
35 trical switch actuated by the pressure undergone
. by the cushion in such a manner that the switch
is operated to energize an electrical circuit which
in turn changes the motion of the press when
the pressure upon the cushion exceeds a pre
40
determined amount.
`
Another object is to provide a hydroinechani-cal press having electromechanical control means
for permitting the press to be manually con
trolled, pressure-controlled, or position-controlled
45 in either a semi-automatic or completely-auto
matic manner.
v11s
agency of the strain rods l, on which are threaded
the nuts 5.- Secured to the side members 3, as 20
by the screws 6, are the retaining members l.
The latter are arranged adjacent to the guide
portions 8, serving to receive the press platen
9 and guide it in its vertical reciprocation. The
platen 9, on its lower surface, is provided with a 25
slot I0 adapted to hold a die, work pieces or
other suitable devices. Journaled in the bear
ings II inthe upper partcf the platen 9 is a
cross shaft I2 (Figures 1 and 5), to which a
link member I3 is pivotally secured.
The opposite end of the link member i3 is
In> the drawings:
Figure 1 is a front elevation, partly in section,
of the hydromechanical press of my invention,
50 -showing the control valve in longitudinal sec
tion, and in a neutral position;
Figure 2 is a longitudinal section through the
control valve shown in Figure 1, but with the
parts arranged in the “forward” position so as
v
30
pivotally mounted upon the cross shaft I4, which
is journaled in the bearings l5 on the yoke por
tion I6 of the hydraulic cylinder Il. The cross
shaft I4 also pivotally supports the link mem 35
bers I8, whose upper ends are pivotally mount
ed upon the cross shaft I9. The ends of the
cross shaft I9 are journaled in the bearings 20,
arranged within a movable anchor block 2|,
which in turn is reclprocable along vertical guide 40
portions 22v on the side members 3 and held in
position by the side plates 23, bolted thereto
by the screws 24 (Figure l). The upper part of
the anchor block 2l is threaded to receive the
vertical rods v 25.
`
55 to produce a down-stroke of the platen;
interconnected by side members 3 through the
The latter pass upwardly 45
through the top member 2 and are provided
with coil springs 26, held in place by the threaded
nuts 21. Accordingly, the anchor block 2| is
yieldably urged upward against. the press top
member 2 by the springs 26. The anchor block 50
2l likewise contains a stud screw 28, which is
received within, the bore 29 of the top member
2. The latter is hollow to provide a tank for
the ñuid‘_used to operate the various hydraulic
mechanisms of the press.
55
v
2,113,115
2
To adjust the position of the anchor block 2|,
a movable wedge 39 is provided (Figure 5), and
interposed between the anchor block 2| and the
lower surface of the press top member 2. When
this Wedge is moved horizontally, as by the hand
wheel 3| upon the threaded stud shaft 32, the
wedge 39 moves in or out and consequently moves
the anchor block 2| up or down. 'This adjust
ment of the position of the anchor block 2| reg
10 ulates the lowest position of the platen 9 during
vided with a spring |32 held in position by a col- _
lar |33. The reciprocation of the control rod
|3| is limited by the collar |34 mounted on the
lower end thereof. An adjustable collar |35 is
also placed upon by the control rod |3I, and is
adapted to be engaged-by the contact sleeve |36
of the arm |31 bolted to the extension |59 0f the
platen 9. (Figure 4.)
'I'he platen 9 is also provided with an arm |38
its working strokes.
'I'he hydraulic cylinder I1 contains a piston 33,
having a contact sleeve |39, adapted to slide up
and down along the switch rod |93 (Figure 4)
whose piston rod 34 is threaded into a swivel
and engage an adjustable collar |49 thereon.
'I‘he switch rod |93 reciprocates vertically in
bored lugs |4| and |42, attached respectively to
the top mëfmber- 2 and the side member 3 of the
press. The switch rod |93 is surrounded by the
coil spring |43 held in place by the threaded cap
|44. The reciprocation of the switch rod |93
is limited by the collar |45, engaging a lug |4| on 20
the top member 2 of the press (Figure 4).
The control rod |3| isprovided with an adjust
block 35, arranged to swivel around the shaft 36.
15 'I'he latter is mounted upon a bracket 31, se
cured to the side members 3 of the press (Figure
5). To prevent leakage between the piston rod
34 and the cylinder |1, through which it passes,
an adjustable gland 38 is provided, and arranged
20 to compress a packing 39, whereby such leakage
is prevented.
The base portion I of the press contains a
cushion block 49 reciprocable in a bore 4| against
the pressure of the coil spring 42. The lower por
25 tion of the cushion block 49 serves as a hydraulic
piston, and the space between it and the bottom
of the bore 4| contains fluid, such asA oil. The
leakage of this fluid is prevented by the adjust
able gland 43 adapted to compress the packing 44
30 around the cushion member 49.
A pipe 45 leads from the bottom of the bore
>4| to the switch-actuating cylinder 96. ‘Within
this cylinder 96 is a piston 95 reciprocable against
theurge of a coil spring 91.
35
control rod | 3| therethrough. The latter is pro
The tension of the
spring 91 is adjusted by the threaded plug 98,
through which passes the piston rod 94. 'I'he lat
ter is adapted to engage the switch knob 93 of an
electrical switch 99, whose connections will be
hereinafter more fully disclosed. Thus when
40 the platen 9 causes pressure to be exerted upon
the cushion 49, the latter will transmit this pres
sure by the fluid within the bore 4| to the switch
cylinder 96. When this pressure becomes suffi
cient to overcome the resistance of the spring 91,
45 the piston rod 94 will engage the knob 93 and
throw the switch 99.
Controlling devices for the press
, 'I'he press is arranged so that it may be oper
50 ated in a variety of ways. First of all, it may be
operated by hand, so that each motion of the
platen 9 downward or upward is controlledby a
hand lever shifted by the operator.
able collar |29 which serves to engage the knob
|2| of a switch I |1 (Figure 4), when the upward
limit of the platen is reached. Similarly, the
switch rod |93 is provided with an adjustable
collar |92 adapted to engage the knob |9| of a
switchl 9| when the lowermost position of the
platen 9 is reached.
The control rod |3| is also provided with a 30
collar |46, engaged by the crank |41, mounted
upon the crankshaft |48. 'I'he latter is supported
in the lugs |49 on the side member 3 of the press,
and is provided with a hand lever |5I, by which
the crankshaft |48 may be turned. (Figures 1
and 4.)
Y
'I'he opposite end of the crankshaft |48 is pro
vided With a lever |52, which is connected by the
link |53 to a yoke |54 on the end of the arma
ture shaft |55 of the solenoid |56. Accordingly, 40
when the solenoid |56 is energized, the crank
shaft |48 is rotated. ` The coil spring |51 is ar
ranged between a vhook |58 on the side member 3
and a lever |59, mounted upon the shaft |48 and
extending in an opposite direction from the lever 45
|52 (Figures 4 and '1).
i
Also secured to the crankshaft |48 is a lever
|69, which engages a link |6| , to the opposite end
of which lis attached the valve connecting rod |62
(Figure 1). 'I'he latter passes through the end 50
walls of valve casing |63, within which recipro
cates the'valve member, generally designated |64.
The valve member |64 is provided with a neck
The press may likewise be controlled for “semi
|65, upon which spaced heads |66, |61 and |68
55 automatic operation”, whereby the plunger per
cornes to rest; or else it may be controlled for
are arranged. 'I'he valve neck |65 also contains
a bored passage |69 so as to nàaintain communi
cation between opposite sides of the valve head
|61. The valve casing |63 is provided on one side
"completely automatic operation”, whereby the
with the spaced ports |19, |1|, and |12, all of.
plunger performs a working stroke, reverses it
self, returns to its starting position, performs an
other working stroke, reverses itself again, and so
on, repeating the working strokes indefinitely
'until stopped by the operator. The reversal of
the platen may be either “pressure controlled” so
leading to the tank |15 of a hydraulic pump |16.„
The pressure line |11 from the _hydraulicpump»A
|_16 enters the valve casing |63 :by the îport |13.,
whereas the suction line |18 proceeds downwardly
forms a working stroke, reverses itself, proceeds
to the top of its return stroke and automatically
as to occur when the pressure exerted by the
platen reaches a predetermined amount; or “po
sition-controlled”, as when the platen reaches a
predetermined position. These results are ob
70 tained by the control devices shown in Figures 1
and 4, and by the electrical circuit shown in
Figure 6.
.
The top member 2 and the base member I of
the press are provided with lugs |39, which are
75 bored to permit the vertical reciprocation of the
these being connected to the discharge pipe |14, y
into the tank |15.
,
The valve casing |63 also contains ports |19
and |89, from which pass the pipes |8| and |82.
These proceed respectively to the opposite ends
of the hydraulic cylinder |1 (Figure 5). Thus
when the valve member |64 is set, as shown in 70
Figure 1, the pump by-passes its fluid and the
press remains in a neutral position. In the Fig
ure 2 arrangement, pressure fluid passes through '
the pipe |8| into the space in front of the pis
ton head 33, causing the cylinder |1 to recipro 75
2,113,115
cate and execute a downward motion of the
platen 9 (Figure 5). Conversely, when the valve
member |64 is arranged as shown in Figure 3,
pressure fluid will enter the space behind the
3
of the pressure cylinder 96 and the piston rod 94,
the latter disconnects the pilot circuit and dc
energizes the holding coil 1| of thc magnetic
switch 50, thereby de-energizing the solenoid |56.
the cylinder I1 to reciprocate rearwardly and
The spring |51 then causes the valve member |64
to move to its Figure 3 position, thus starting an
draw the platen 9 upward. Thus the operation
upward stroke of the platen.
of the valve member |64 may-be controlled man
ually by the hand lever |5|, or else electrically
If, on the other hand, the arms 84 and 85 of
the double-throw switch 83 are closed upon the
piston head 33 by way of the pipe |82, causing
by the action of the solenoid |56.
.
Electrical control circuit
contact pointsl 88 and 89, the platen-operated
lower position switch 9|, which is normally
closed, will be thrown open when the switch rod
The electrical circuit whereby the solenoid |56 - |03 is moved downward by the platen until the
and the electrical accessories of the press are collar |02 engages the switch knob |0| and opens
connected or disconnected is shown in Figure 6. the switch. This again de-energizes the hold
ing coil 1| ofthe magnetic switch 50, and accord
Electrical energy for the operation of the cir
cuit is received from the power lines 55 and 56 ingly de-energizes the solenoid |56, and thus in
and passes to the magnetic switch, generally a similar manner to that previously‘described,
causes the valve member |64 to be'shiited> to its
designated 50. The magnetic switch 50 is a two
reverse position (Figure 3) under the action of
pole normally-open main switch, which is pro
vided with switch arms 59 and 60, adapted to ‘the spring |51. Thus by throwing the double
engage switch points 6| and '62, to which the throw switch 83 in one direction, the press bc
power lines -55 and 56 are respectively connected.
The switch arms 59 and 60 are normally kept
out of contact with the switch points 6| and 62
by being mounted upon the shaft 63, which is
rotated in the direction of the arrow by the
spring 53 attached to the arm 52 and anchored
to the hook 54. The solenoid |56 isenergized
by the lines 51 and 58 coming from the switch
arms 59 and 60.
'
ï
The magnetic switch 50 is rotated in the op
posite direction >to thc arrow and thereby closed
by an electrical vpilot circuit connected across
Ll the lines 55 and 56. This pilot circuit com
prises three branches 65, 66, and 61, having'a
common circuit portion 68, connecting each
branch to the power line 56. The branches 85,
66 and 61 also have a common circuit portion 69
40 connecting them to the power line 55. The cir
cuit 68 includes the holding coil 1I, which, when
energized, serves to close the switch 50, this
comes reversible when a predetermined pressure
is reached, whereas by throwing it in the oppo
site direction the press becomes reversible when
a predetermined position is reached.
When the holding coil 1| has been once cuer
gized, however, and the contactor bar 14 caused
to engage the contact arms 15 and 16, the hold
ing coil 1| will be maintained in an energized _'
condition through the lines 82 and 69, togethm~
with either of the circuits previously described,
until either the emergency reverse switch 88, thc
pressure reverse switch 90, or the lower position
reverse switch 9| is opened.
_
The holding coil 1| is connected by the lines
68 and 19 through the push button starter switch
| |2 and the lines | I3 and 69 to the power line 55,
previously mentioned. Assuming that the mag
neticy switch 50 is open (Figure 6) and the var
rious circuits de-energized, the closing of thc
manually operated push button starter switch
||2 energizes the pilot circuit through the lines
armature 12 attached to the switch shaft 63, as ` 68, 19, H3, and 69. This energizes the holding
action being performed by its attracting the
at 13. The opposite end of the armature 12
carries a normally-open contactor bar 14. When
the holding coil 1| is energized, the contactor
bar 14 engages the contact arms 15 and 16, thus
connecting theline 65 with the line 69, and com
pleting the pilot circuit through the former.
The line 68 contains the manually operated
switch 10 (Figure 6), whereby the holding coil
1| may be permanently de-energized. The line
68 contains a branch line 19, leading to a nor
mally-closed emergency reverse push button
switch 80, from the opposite side of which leads
the line 8| to one arm 84 of the double-pole dou
ble-throw switch 83. To the opposite arm 85
thereof is attached the line 82 leading to the
60 Contact arm 15 of the magnetic switch 50.
The double-pole double-throw switch 83 con
tains a pair of switch points 86 and 81 which,
when engaged by the switch arms 84 and 85,
will close `Jthe circuit through the normally
closed pressure-responsive switch 90. Converse
ly, when the arms 84 and 85 engage the opposite
contact points 88 and 89 of the double-throw
switch 83, the circuit will be closed through the
normally-closed lower position switch 9| oper
ated by the extension |50 of the platen 9. '
Assuming the switch arms 84 and 85 to be
engaging the switch points 86 and 81, when the
pressure -within the chamber 4| beneath the
cushion 40 exceeds Va predetermined amount and
75 throws the pressure reverse switch 90 by means
coil 1| and closes the magnetic switch 50.
The 45
contacter bar 14 then engages the contact arms
15 and 16, maintaining the holding coil 1| in an
energized condition even when the push button
starting switch I|2 is released and opened.
Under the action of the above described cir 50
cuits, the platen will move downward and engage
the dies and Work pieces, reversing itself when
the predetermined pressure or the predetermined
position is reached, according to the setting ol
the double-throw switch 83. The platen then rc 55
turns to its topmost position and comes to rest.
This mode of operation is termed “semi-auto
matic operation”.
When “completely automatic operation” is de
sired, so that the platen immediately starts an 60
other downward stroke after reaching its top
most position, the circuit shown at the bottom of
Figure 6 comes into play. This circuit includes
the manually-operated switch ||5 connected on
one side to the line 68 by the line 61 and on the 65
other side by the line ||6, running to the upper
position switch ||1. The latter is a normally
open switch which is closed when the platen
pushes the control rod | 3| upward and causes `
the collar |20 to engage the switch knob |2| 70
and close the switch ||1. This again energizes
the holding coil .1| of the magnetic switch 50.
thus energizing the solenoid |56, shifting the
valve member |64 to its .“working stroke” posi
tion (Figure 2), and causing a downward stroke 75
4
2,113,115
of the platen to take place.
The platen will then
actuated by said platen, a member adapted to
move downward, release the upper position switch
I il, and will continue its movement until it causes
either the pressure control switch 90 or the posi
reverse the movement of a fluid, electrical means
tion-controlled switch 9i to be thrown, thereby
de-energizing the solenoid |56 and reversing the'
action of the press.
In this manner, the press is
caused to repeat its working strokes indefinitely
until the manual switch H5 is opened.
’I‘he reversal of the platen at the end of a work
ing stroke, either at “position” limit or at "pres
sure” limit, together with an electromechanical
circuit for operating the press in a “semi-auto
matic” or “completely-automatic” manner, has
been disclosed in the present specification.
It will be understood that we desire to compre
hend within our invention such modifications as
may be necessary to adapt it to varying condi
tions and uses.
Having thus fully described our invention, what
we claim as new and desire to secure by Letters
Patent is:
1. In combination in a press, a movable platen,
a hydraulic cylinder-and-piston assembly adapt
25 ed to move said platen, a cushion adapted to be
actuated by said platen, and means for causing
the reversal of motion of said platen responsive
to the attainment-of a predetermined pressure
upon said cushion, said reversing means com
30 prising a member adapted to reverse the move
ment of a fluid, electrical means adapted to
shift said member to reversing position, and a
pressure-responsive switch operatively connected
to said cushion and adapted to be operated to
35 control the actuation of said electrical means
in response to the attainment of said predeter
mined pressure-upon said cushion.
2. In combination in a press, a movable platen,
a hydraulic cylinder-and-piston assembly adapt
40 ed to move said platen. a cushion adapted to be
adapted to shift said member to a reversing po
sition, a switch adapted when operated to ener
gize said electrical means to shift said member
to a reversing position, and a hydraulic plunger
connected to said cushion and adapted to oper
ate said switch to energize said electrical means
and shift said member to reversing position in
response to theÀ attainment of a predetermined
pressure upon said cushion whereby to reverse
the direction of travel of said platen in response
to its causing a predetermined pressure to be
exerted upon said cushion.
3. In combination in a press, a movable platen, A
a source of pressure fluid, a hydraulic cylinder
and-piston assembly adapted to move said platen,
a member adapted to reverse the movement of
the iiuid, a cushion adapted to be actuated by
said platen, between said source and said assem
bly, electrical means adapted to shift said mem
ber to a reversing position, a switch adapted
when operated to energize said electrical means to
shift said member to a reversing position, and a '
hydraulic plunger connected to said cushion and 25
having yielding means associated therewith ar
ranged to oppose the shifting of said plunger
when acted upon by the pressure ñuid trans
mitted thereto from said cushion, said plunger
being adapted to operate said switch to energize 30
said electrical means and shift said member to
reversing position in response to the attainment
of a predetermined pressure in said cushion suf
ñcient to overcome the opposition of said yield
ing means whereby to reverse the direction of 35
travel of said platen in response to its causing
a predetermined pressure to be exerted upon said
cushion.
HOWARD F. MAcMILLIN.
DON C. YOUNGBLOOD.
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