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Патент USA US3051088

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Aug. 28, 1962
J. |_. WEBSTER
3,051,078
ADJUSTABLE-SHUT-HEIGHT PRESS
Filed Aug. 9, 1960
5 Sheets-Sheet 1
INVENTOR
JOHN L . WEBSTER
BY
M 495W
ATTORNEY
Aug. 28, 1962
J. L. WEBSTER
3,051,078
ADJUSTABLE-SHUT-HEIGHT PRESS
Filed Aug; 9, 1960
5 Sheets-Sheet 2
22
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HIV?
INVENTOR
JOHN L. WEBSTER
BY
ATTORNEY
Aug- 28, 1952
-
J. L. WEBSTER
3,051,078
ADJUSTABLE-SHUT-HEIGHT PRESS
INVENTOR
JOHN L. WEBSTER
BY 4W l
ATTORNEY
'
Aug- 28, 1962
J. L. WEBSTER
3,051,078
ADJUSTABLE-SX-HJT-HEIGHT PRESS
Filed Aug. 9, 1960
5 Sheets-Sheet 4
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INVENTOR
JOHN L. WEBSTER
BY JAM", i %@<An/
ATTORNEY
Aug. 28, 1962
J. |_. WEBSTER
3,051,078
ADJUSTABLE-SHUT-HEIGHT PRESS
Filed Aug. 9, 1960
5 Sheets-Sheet 5
rNvENTok
JOHN L. WEBSTER
BY 4w & 9W
ATTORNEY
United States Patent Office
1
3,d5l,078
Patented
23, 1962
2
3,051,078
intermediate location between its ends is another upright
member 18, the space above the base member and be
John L. Webster, Henrico County, Va, assignor to Reyn
olds Metals Company, Richmond, ‘Va, a corporation
tween uprights 16,‘ 17 and upright 18 serving to enclose
ADJUSTABLE-SHUT-HEIGHT PRESS
of Delaware
Filed Aug. 9, 1960, Ser. No. 48,544
14 Claims. ((Il. 190-257)
This invention relates to presses and, in particular, to
presses operated by mechanical linkages.
a stationary lower platen 20‘ and a movable upper platen
21, later to be described. As the uppermost ends of
upright members 16 and 17, a pair of parellel elongated
brace members 22 and 23 spaced from each other and
extending transversely of the platens are rigidly a?ixed to
those uprights, these ‘brace members being attached ‘also
One object of the invention is to provide an improved 10 to corner braces 24 and 25 ‘which in turn are rigidly at
tached to the sides of the upright member 18 at its upper
press having a wide range of shut-heights and in which an
end. Similarly, the base plate 10‘ at the other end of the
adjustment from one shut~height to another may be made
frame is likewise mounted and braced against similar up
rapidly and with a small expenditure of labor.
rights, including upright 18a a similar pair of elongated
Another object is to provide a press capable of exert
brace members 26 and 27‘ spaced from each other, being
ing heavy pressures by means of mechanical leverages.
employed in the combination. Thus, at the two extreme
A further object is to provide a compact, relatively
ends of the press and at the highest part of the press
light-weight and relatively inexpensive press capable of
frame, the pairs of transverse brace members provide a
exerting heavy pressure upon a work piece.
A still further object is to provide a press having a mov
able upper platen actuated by levers ‘and maintaining a
parallel relationship to its companion lower platen during
its movement.
Other objects and advantages of the invention will be
come more apparent as the description proceeds and when
considered in conjunction with the accompanying draw
ings in which:
FIG. 1 is a side elevation view of the press with the
platens in contact with each other and with portions of
the structure broken away.
FIG. 2 is an end elevation of the press of FIG. 1;
FIG. 3 is ‘a top plan View of the press of FIG. 1;
FIG. 4 is a diagrammatic view showing a suitable hy
draulic system for use with the press of FIG. 1 and in
cluding conventional J.I.C. hydraulic symbols;
FIG. 5 is a sectional view of a detail taken on line 5——5
of FIG. 2;
FIG. 6 is a sectional view of a detail taken on line
6--6 of FIG. 2;
FIG. 7 is a sectional view of a detail taken on line 7——7
of FIG. 3;
'
FIG. 8 is a sectional view of a detail taken on line 8——8
of FIG. 2, and
vFIG. 9 is a sectional view of a detail taken on line 9-9
of FIG. 2.
In accordance with the invention a press having an ad
justable shut height is provided with a frame and platens,
the upper platen being movable toward and away from
the lower platen while remaining parallel thereto and
being actuated by power cylinders located to one side of
the frame through the intermediary of a series of levers
extending transversely of the platens. Lifting cylinders
also are provided for raising and holding the upper platen
incident to an adjustment of the press shut height, and
these cylinders further assist in maintaining the upper
platen parallel to the lower platen during the normal op
erations of the power cylinders. The frame is comprised
of an assembly of relatively light-weight structural ele
ments arranged in combination with the respective cylin
convenient mounting for the lifting cylinders, later to be
described.
The centrally located base plates 11, 12 and 13 are
each rigidly attached to and con?ned at their rearward
ends between pairs of upright members 30, 31; 32, 3-3;
and 34, 35, respectively, these uprights not being as long
' as the previously described upright members.
At their
upper ends these shorter uprights ‘are each rigidly attached
to a side brace 36 extending across the entire side of the
frame and affixed also to the earlier described longer up
rights, as best seen in FIG. 3‘. Further bracing of the
frame is secured by means of an elongated tie rod 37 ex‘
tending through apertures in each of the base plates ad
jacent the forward end thereof, suitable tubular spacers
33, 391, 40 and 41 surrounding that tie rod being disposed
between adjacent base plates, and with the rod being se
Other
tie rods, such as seen at 42 and 43, arranged in the same
' cured at its ends by nuts, as best seen in FIG. 1.
manner, may be employed as desired.
As will thus‘ be ap
parent, a compact well braced and relatively light-Weight
press frame is provided for the press operation later ‘to
be described.
As a signi?cant feature, the invention makes possible
a ready adjustment of shut height for the press and in this
respect each of the rear upright members is provided with
_ a plurality of vertically arranged apertures therethrough
as seen at 44 in FIG. 2.
For each pair of rear uprights a
fulcrum member is adjustably mounted therebetween and
includes a forwardly projecting portion 45. As seen in
FIG. 5, the pairs of uprights 34, 3‘5 and 16, 17, for exam
ple, may have fulcrum members 46 and 47, respectively,
the fulcrum member 46 also appearing on FIG. 3. These
fulcrum members are‘securel‘y fastened to the respective
uprights by means of suitable pins 48 and 49‘ extending
through the selected apertures 44, and the forwardly pro
jecting portions 45 of each fulcrum member in turn has
an aperture therethrough for mounting of a pivoted lever
next to be described.
The pins which are removable
from the uprights and fulcrum members during an“ ad
justment of the shut height of the press, may conveniently
ders to provide for a given press tonnage capacity, a more 60 be held against axial movement‘ by means of readily re
compact, less expensive and lighter-weight press than
conventional presses of this type having equal tonnage
capacities.
movable retaining rings 50 at each end thereof. Rather
than employing long pins, it is preferred to use shorter ones
extending through less than all of the fulcrum members.
As will be understood, similar mountings“ are employed
Referring now to FIGS. 1, 2 and 3, the press includes
a framework having a number of elongated, parallel 65 for the fulcrum members associated with the pairsiof rear
spaced, base plate members 10, '11, 12, 13 and 14, mounted
on edge upon any suitable supporting surface 15.
Talr
uprights other than those seen in FIG. 5.
'
“
Referring now to FIGS. 2 and 6, the forward end 45
ing a ‘base plate 14 at one end of the frame as an exam~
of each fulcrum member pivotally supports the rearward
ple, this base plate at its rearward edge, corresponding to
ends of a pair of elongated lever arms,'such as shown at
one side of the press, is con?ned between and rigidly 70 51 and 52, associated with power cylinder 53. By means
secured to two elongated upright members 16 and 17.
of a short pin 54 extending through apertures in the lever
Also attached to a side surface of this base plate at an
arms and fulcrum member, these arms may pivot about
3,051,073
3
4
the pin 54 as a fulcrum. The pin, moreover, is restrained
against axial movement by retaining rings 55 at each end
lever arms 51 and 52 embrace therebetween a piston rod
extension 98 which is connected to the piston of power
thereof. The remaining piars of lever arms 56, 57; 58,
59; 60, 61 and 62, 63, associated respectively with power
cylinders 64, 65, 66 and 67 and with the other fulcrum
members, are similarly mounted for pivotal movement at
their rearward ends.
cylinder 53, the extension being pivotally a?ixed to those
Passing now to FIG. 7, the upper surface of movable
platen 21 has rigidly af?xed thereto, as by bolts 68, a pair
of spaced brackets 69 and 70 between which is pivotally
mounted a link 71 by means of a pin 72 passing through
lever arms as by means of a pin 99 retained against axial
movement by retaining rings 11% at each end. As in the
case of the shiftable fulcrum members, the piston rod
extension 98 is provided with a series of vertically spaced
apertures 101 through one of which the pin 99 is de
tachably arranged. The extreme forward ends of the lever
arms may also be provided with a cap 102 bolted thereto,
as when the aperture for the pin 99 extends to the outer
most end of those levers ‘for simplicity in ‘assembling the
structure during a change in the shut height of the press.
apertures in the brackets and in the link, the pin being held
against axial movement by a retaining ring 73 at each end.
In similar manner, each of the other pairs of lever
The upper end of the same link is pivotally mounted by
means of a pin 74 between the pair of lever arms 56 and 15 arms are pivotally engaged with the piston rod exten
sions from the pistons ‘of the other power cylinders.
S7 and with the 'pin 74 being restrained against axial move
Each of the power cylinders, as seen in FIGS. 1 and 2,
ment by the retaining rings 9, each of the axes of the
may, when employing a pressure ?uid at about 2000 psi.
pins 72 and 74 preferably lying in a common vertical
with a press tonnage capacity of about 2000 tons, be
plane when the platens are in contact with each other and
with that vertical plane being forwardly of the axis of 20 about 10 inches in inner diameter and with a stroke, of
about 15 inches. These cylinders are pivotally secured
pin 54. Thus, as the lever arms are pivoted upwardly or
at their lower ends as by a pin 103 passing through each
downwardly during operation of the press, they serve to
base plate member adjacent the forward end-s of those
move the upper platen with them through the connection
members and through a pair of depending bosses 104
afforded by the described link. ' It will be understood that
and 105 a?ixed :to the lower end of the cylinder. As in
similar links 75 and 76 are provided for the other pairs of
dicated
in FIG.,1, suitable headers 106 and 107 have
centrally disposed lever arms 58, 59; and 60, 61, but that a
?exible conduits .108, and 189 attached thereto leading
di?ferent link, now to be described, is provided for the
to the respective ends of the power cylinders to‘ supply
endmost pairs of lever arms. Also, the location of all
and withdraw the pressure ?uid therefor.
of the brackets connecting these links to the upper platen
As seen in FIG. 2 the lower platen 20 rests upon elon
is generally along the longitudinal center line of that
platen.
Referring now to FIG. 8, the upper surface of platen 21
has rigidly a?ixed thereto, as by bolts 68, a pair of spaced
brackets 79 and 80, similar to the described brackets 69
and 70, and between which is pivotally mounted a link 81
somewhat longer than the described link 71. Link 81
is pivotally mounted to its brackets by means of a pin 82
passing through apertures in the pin and brackets, the pin
being held against axial movement by a retaining ring 83
at each end. The upper end of the link is provided with
a recess into which the lower end of the connection 84
of the lifting cylinder piston rod extends, being pivotally
engaged therewith by means of a bolt 85 having a nut 86
gated stringers ‘M01 and 111 extending across the tops
of the base plate members. ‘from end to end of the frame,
such stringers being attached both to the lower surface
of that platen and to the top of those base plate members.
Preferably, the rear side of the platen rests in contact
with the confronting edges of the rearward uprights and
the rear side of the upper platen also preferably moves
in contact with those edges of the uprights serving as
a guide for the upper platen. Near each end of the
upper platen a pair of recesses are formed in the front
side thereof in confronting relation to the inner edges of
the forward uprights >18 and 18a and within these recesses
a pair of compression springs are disposed acting to pro
for fastening purposes. In addition, the link 81 is piv
ject outwardly a pair of upper~platen~stabi1li2ing pins 112
otally engaged by means of a pin 74a as above described
It will be appreciated that the press thus vfar described
may be employed for many usages upon con?nement of
a work piece between the platens. Such platens may have
smooth confronting surfaces or may support dies, or the
like. In one usage, the press may be employed in the
expansion of a hollow passageway panel 120 as indi
cated diagrammatically in FIG. 4. Such a panel may
and passing through apertures in that link and in the lever
arms 51 and 52, the pin 74a being restrained against axial
movement by the retaining rings 8. A similar linkage is
employed with platen 21, lever arms 62, 63, link 81a, and
the piston rod of lifting cylinder 91, at the opposite end
-of the press.
Each of the lifting cylinders 90 and 91 which, for ex
ample, when employing pressure ?uid at about 2000 psi,
may be about 5 inches in inner diameter with a 24 inch
.stroke, has a parallel outer side portion ?tting closely be
tween the transverse brace members 22, 23 and 26, 27,
‘respectively, and at about the mid point of the length of
'these cylinders they are suitably supported for rocking mo
tion about shafts 92 and 93 fastened in the cylinder walls
-and extending into recesses in the brace members. These
‘cylinders are preferably of the double-rod-end type with
a continuous piston rod extending through both of the
cylinder heads and attached to a piston 94 within the cyl
and 113.
comprise a composite ?at sheet of aluminum having two
originally separate laminations bonded together in cer
taln regions de?ning the boundaries of the passageway
as seen in dot-ted lines.
The passageway has an un
bonded entranceway 121 and an unbonded outlet 122 into
which expansion nozzles 123 and 1124 may be inserted.
Upon application of a high pressure in?ating ?uid to the
unbonded portions of the panel while con?ned between
the platens of the described press, the appropriate portions
of the panel are stretched and ‘form the desired passage
ways. When the present press is to be employed for such
a use it will vbe understood that a separate pressure ?uid
inder and extending through packing glands 9‘5. Fluid
system will normally be employed to effect the panel ex
displacement on both sides of the respective pistons in the 65 pansion and such a system, forming no part of the
respective cylinders is so coordinated that the piston rod
present invention, may conventional-1y comprise a separate
extensions 84 move simultaneously and enable the lifting
reservoir 125 containing ‘a substantially incompressible
cylinders to maintain the parallelism of the two platens
liquid and ‘from which a heavy duty pump 126, driven
at all times. As shown at 149 and 151 for cylinder 90 in
FIG. 1, suitable ?exible supply conduits are attached to
the respective ends of the cylinders to supply and withdraw
the pressure ?uid, similar connections being provided for
the companion cylinder 91, as will later be apparent.
by a motor 127, draws the liquid through conduit 123.
The pump discharges into a conduit 129 equipped with
a control valve 130 and connected at its end to the noz
zle ‘124 adapted to be ?tted in pressure tight relation
to the unbonded passageway inlet to the panel. The
Referring now to FIG. 9, the forward ends of the 75 unbonded outlet passageway of the panel likewise may
3,051,078
5
be connected in ?uid tight relation with nozzle 123 in
a return conduit i131 controlled by valve 132.
6
sions 98 downwardly in unison and to vent the lower
‘For the purpose of operating the piston-and-cylinder
ends of the power cylinders through that valve. As this
occurs, the piston rod extensions 98 pull each of the
assemblies of the press, however, a variable discharge
pump 140 driven ‘by motor 141 draws from a supply res
pairs of lever arms downwardly about their pins 54 as
a fulcrum and with a magni?ed leverage commensurate
ervoir 139 and discharges into header ‘14-2 having a relief
with the respective distances between pins 54 and 99 and
valve 143 and a manually operable three~way selector
between pins 54 and 74 or ‘74a. This leverage in turn
valve 144 connected thereto. From selector valve 144
is transmitted through the links to the upper platen and
?uid under pressure may be directed from header ‘142 into
thence to the work piece con?ned between the platens.
conduit 14-5 leading to a manually operable, open cen 10 In moving downward, moreover, the upper platen remains
ter, four-way selector valve 146. Leading from valve
parallel with the lower platen and with-out partaking of
146 are headers 106 and 107 serving respectively to supply
any transverse movement which might abrade the work
pressure ?uid to, ‘and vent pressure ?uid from the upper
piece.
ends of the power cylinders and ‘the lower ends of the
Downward movement of the platen also moves the
power cylinders depending upon the settings of valves i146
piston rod projections 84 downwardly with a rocking
and 144. From selector valve ‘144 pressure ?uid may
movement of the cylinders 90 and 91 opposite to that
also be ‘directed into conduit v147 leading to another open
previously described. At this time ?uid displaced from
center, ‘four-way manually operable selector valve 148.
beneath the piston in cylinder 90 passes through conduit
Leading from Valve ‘143 are conduits 149 and 156 which
149, the open center of valve 148 and conduit 154)‘ to
connect respectively with the lower end of lifting cylinder 20 the upper end of cylinder 91, while ?uid displaced from
90 and ‘the upper end of lifting cylinder 91. In addi
beneath the piston in cylinder 91 passes through conduit
tion, a transfer conduit 151 connects the lower end of
151 to the upper end of cylinder 96, this ?uid displace
cylinder 91 and the upper end of cylinder 94} and a nor
ment serving to provide synchronous movement of the
rnally closed ‘bypass conduit 1'52. controlled by a man
piston rod projections $4 and thus to maintain parallelism
ually operable valve ‘153 connects conduits 15d and 151. 25 of the platens. it will be further understood that, while
Suitable vents for each of valves 143, ‘146 and 148 and
the power cylinders are applying pressure to the platens
leading into the reservoir 139‘ also are provided, and con
with the lever arms pivoted downwardly, the expansion
ventional valves and pumps are employed.
of the passageway panel by employment of its own pres
Having thus described a suitable combination of struc
sure system will be conducted. As will be noted, the
ture and allied hydraulic system for carrying out the
movement of the upper platen under the action of the
invention, the novel features and capabilities of the in
power cylinders is also re?ected in movement by the
vention will now be apparent to those skilled in the art
pistons in the lifting cylinders and the by-passing of in
upon considering the following operation of the structure.
compressible liquid between those lifting cylinders. Ac
Assuming that a thin work piece, such as the panel 129
cordingly, the lifting cylinders serve to synchronize the
is to be worked upon and with the press platens in con 35 upper platen movement and being attached to the ends
tact with each other, as seen in FIGS. 1 to 3, the opera
of that platen also serve to hold it in parallel relation to
tor adjusts valve 145 to direct pressure ?uid into header
the lower platen at all times.
107 thus raising the extensions 98 associated with the
Having thus described a normal press operation with
rising pistons in each of the power cylinders, the ?uid
a work piece requiring a small shut-height dimension,
above those pistons now venting through valve 145. As 40 the following operation would be conducted if the suc
these extensions rise, the pairs of lever arms pivoted
ceeding work piece were of a size requiring a much
thereto by pins 99 pivot about the rearward pins 54 as
greater shut height. The operator accordingly would
a fulcrum. Moreover, the respective links 81, 71, 75,
first detach each of the pairs of levers from their respec
76 and 81a connected between the upper platen and
tive piston rod extensions 98, as by removing the several
those rising lever arms likewise lift the upper platen and 45 caps 102, pushing each pin 99 endwise su?iciently to
provide a space into which the panel 20‘ may be inserted
clear the aperture 101 of the piston rod extension 98,
between the platens. It will be noted that in this rising
and then pivoting that extension to the left, .as seen in
movement the rear side edge of platen Z1 rides in con
FIG. 2. The operator next moves each of the longer
tact with the edges of the rear uprights and that the
pins 48 and 49 endwise toward the right-hand end of
heavy compression springs behind the stabilizing pins 50 the press as seen in FIG. 3 until the apertures of the
112 and 113 cause such rear edge of the platen to main
fulcrum members 46 and 47 are uncovered by those
pins. Similarly, the companion elongated pins for the
tain that contact. During this rising movement the upper
ends of both links 81 and 81a are displaced slightly
three other fulcrum members are moved endwise toward
the left-hand end of the press until the apertures of
forward, pivoting about their pins 82, and through the
piston rod projections 84 causing each of cylinders 90
those fulcrum members are uncovered thereby. At this
time, the upper platen rests upon the lower platen and
and 91 to rock about their points of suspension in the
the ends of all levers are now detached from the frame.
pairs of brace members 22, 23 and 26, 27. Likewise,
the power cylinders pivot to a slight extent about their
pins’1tl3. Thus, as the platen 21 rises, its lower surface
remains parallel to the upper surface of the lower platen
and, of signi?cance, no transverse shifting of the upper
platen with respect to the lower platen occurs. More~
over, as piston rod projections 84 are actuated by the
rising of the platen, they force their connected pistons
slightly upward in the lifting cylinders, displaced ?uid
above the piston in cylinder 90 passing to cylinder 91
below the piston therein and displaced ?uid above the
piston in cylinder 91 passing to the open center of valve
143 and thence to cylinder 90 below the piston therein,
The above-described lever-disconnecting operation may
be easily and rapidly carried out by the operator stand~
ing on surface 15.
With each of the levers so disconnected, the operator
then shifts valve 1441 to direct pressure ?uid into conduit
147 and then shifts valve 148 to direct. this ?uid from
conduit 147 into conduit 149. As this occurs, ?uid is
first directed under the piston in lifting cylinder 91) and
this piston starts to rise in a controlled manner carrying
with it, through the piston rod projection 84, the upper
platen, each of the fulcrum members, and each of the
pairs of levers. As this lifting movement takes place, the
as seen in FIG. 4. In addition, upward movement of the 70 piston in cylinder 91 likewise is lifting the same described
pistons in each of the power cylinders transfers ?uid
parts. Fluid displaced from above the piston in cylinder
through header 166 into the vent of valve 146.
90 is transferred under pressure through conduit 151 to
With the panel 120 in place, the operator then shifts
below the piston in cylinder 91 and assists in the lifting
valve 146 to pass pressure ?uid from conduit 145 to
action. In the meantime, ?uid displaced from above the
header 1% thus to move each of the piston rod exten
piston in cylinder 91 vents from valve 143 until the
3,051,078
8
7
desired amount of lifting has been accomplished. At that
points of attachment for selective attachment thereto of
time, the operator then shifts valve 148 to cut off further
supply of ?uid to conduit 149 at which time the load
said second end of said lever.
supported by the pistons in the two lifting cylinders
comes to rest. Normally, a skilled operator can bring the
load to rest at an elevation such that the apertures in
the fulcrum members will be in alignment with the desired
apertures 44 in the uprights corresponding to the shut
height desired for the press.
Since an important ‘function
3. Apparatus as de?ned in claim 1 wherein said upright
includes a plurality of vertically arranged points of at
tachment for selective attachment thereto of said fulcrum
member.
4. Apparatus as de?ned in claim 1 wherein said power
piston rod and said upright each includes a plurality of
vertically arranged points of attachment for selective
of the lifting cylinders is to maintain parallelism of the 10 attachment thereto of said second end of said lever and
said fulcrum member respectively.
5. In combination in a press having an adjustable shut
in the hydraulic system, the manually adjustable valve
platens and since a certain amount of leakage may occur
153 serves a signi?cant purpose in this regard.
For exam
ple, with the valve 153 in open position, the upper platen
may be adjusted into parallelism with the lower platen,
?uid meanwhile ?lling the respective ends of the lifting
cylinders 90 and $1 and the conduits connected therewith.
After such adjustment, the valve 153 is closed and there
after the synchronous movement of the pistons in those
cylinders will again be assured.
When the respective apertures are in alignment at the
desired shut-height, the elongated pins are then reinserted
height, a frame having a ?rst vertically arranged up
right at one side thereof, a lower platen, an upper platen
movable toward and from said lower platen, a second
vertically arranged upright of said frame on the side
of said platens opposite said ?rst upright; means guiding
said upper platen along at least one of said uprights
during movement of said upper platen, a fulcrum mem
ber adjustably and removably mounted upon said ?rst
upright, a power piston-and-cylinder assembly pivotally
mounted at the side of said frame opposite said ?rst
upright and having a power piston rod extending out
wardly of said power cylinder, a lever extending across
frame. Thereafter, the piston rod extensions 98 are piv 25 said upper platen and having a ?rst end pivotally attached
to said fulcrum member and a second end pivotally and
oted to engage between the forward ends of the levers,
removably attached to said power piston rod, a link
the pins 99 are moved endwise to engage in the chosen
pivotally attached at its respective ends to said upper
aperture 101 within those extensions and the caps 102 are
platen and to said lever intermediate the ends of said
restored in place. It will be understood that at this time
the upper and lower platens are separated from each other 30 lever, a lifting piston-and-cylinder assembly pivotally
mounted on said frame above said upper platen and
at a shut-height different from the one employed in the
having a lifting cylinder means pivotally connecting said
expansion of the ?at panel 120 previously described, but
into fulcrum members and the uprights and the rear ends
of the pairs of levers once more become attached to the
that the same magni?ed leverage upon the work piece Will
be exerted when the press is operated.
lifting piston rod to said upper platen, means for direct
ing pressure ?uid to and from said power piston-and
After thus changing the shut-height, the operator then 35 cylinder assembly thereby to move said upper platen
selectively toward and away from said lower platen and
means for directing pressure ?uid to and from said lift
and the press is again in operable condition.
ing piston-and-cylinder assembly thereby to support said
Having thus described the invention and having shown
upper platen, said lever arm, and said fulcrum member
a presently preferred embodiment thereof, it will be under
during an adjustment in shut height of said press.
stood that numerous changes may be made in the con
6. Apparatus as de?ned in claim 5 wherein said means
struction and mode of operation without departing from
pivotally
connecting said lifting piston rod to said upper
the spirit of the invention, and it is, therefore, desired
platen includes said link.
that the present embodiment be considered as illustrative
7. Apparatus as de?ned in claim 5 wherein the attach
and not restrictive, reference being made to the appended
ment of said ?rst end of said lever to said fulcrum lies
claims rather than to the foregoing description to indi
between said uprights, and said attachment of said
cate the scope of the invention.
moves valve 144 to direct pressure ?uid into conduit 145
What is claimed is:
l. In combination in a press having an adjustable shut
height, a frame having a vertically arranged upright at
one side thereof, a lower platen, an upper platen movable
toward and from said lower platen, a fulcrum member
adjustably and removably mounted upon said upright, a
power piston-and-cylinder assembly pivotally mounted at
the side of said frame opposite said upright and having
a power piston rod extending outwardly of said power '
cylinder, a lever extending across said upper platen and
having a ?rst end pivotally attached to said fulcrum merm
second end of said lever to said power piston rod lies
outboard of said second upright, the distance between
said fulcrum-lever attachment and lever-piston rod at
tachment being substantially greater than the distance
between said fulcrum-lever attachment and lever-link at
tachment thereby to provide a substantial leverage action.
‘8. Apparatus as de?ned in claim 5 including a pair of
brace members spaced from each other and rigidly
mounted at the respective upper ends of said ?rst and
second uprights, said lifting piston~and-cylinder assembly
being pivotally mounted between said brace members.
9. A press having an adjustable shut-height including a
ber and a second end pivotally and removably attached
frame comprising a plurality of horizontally disposed par
to said power piston rod, a link pivotally attached at its
respective ends to said upper platen and to said lever 60 allel base plates spaced from each other, a ?rst vertically
arranged upright attached to each of said base plates
intermediate the ends of said lever, a lifting piston-and
adjacent the rearward end thereof, a second vertically
cylinder assembly pivotally mounted upon said frame
arranged upright attached to each of the end-most base
above said upper platen and having a lifting piston rod
plates
intermediate the ends of said end~most base plates,
projecting downwardly from said lifting cylinder, means
a lower platen supported upon the tops of said base
pivotally connecting said lifting piston rod to said upper
plates between said ?rst uprights and said second up
platen, means for directing pressure ?uid to and from
rights, an upper platen movable toward and from said
said power piston~and-cylinder assembly thereby to move
lower platen, means guiding said upper platen along at
said upper platen selectively toward and away from said
least one of said uprights during movement of said
lower platen, and means for directing pressure ?uid to
upper platen, a plurality of fulcrum members adjustably
and from said lifting piston-and-cylinder assembly thereby
and removably mounted upon each of said ?rst uprights,
to support said upper platen, said lever arm, and said
a plurality of power piston-and-cylinder assemblies piv
fulcrum member during ‘an adjustment in shut height of
otally mounted upon each of said base plates adjacent
said press.
'
the forward end thereof and having a power piston rod
2. Apparatus as de?ned in claim 1 wherein said power
piston rod includes a plurality of vertically arranged 75 extending outwardly of said power cylinder, a plurality
m
3,051,078
9
10
of levers extending across said upper platen and each
power piston rod extending outwardly of said power
having a ?rst end pivotally attached to one of said ful
cylinder, a lever extending across said upper platen and
having a ?rst end pivotally attached to said fulcrum
member and a second end pivotally and removably
attached to said power piston rod, a link pivotally at
tached at its respective ends to said upper platen and to
said lever intermediate the ends of said lever, a pair of
crum members and a second end pivotally and remov
ably attached to one of said power piston rods, a plu
rality of links each being pivotally attached at its respec
tive ends to said upper platen and to one of said lever
arms intermediate the ends of the lever arm, a pair of
lifting piston-and-cylinder assemblies pivotally supported
double-acting lifting piston-and-cylinder assemblies piv
from the uprights of said frame respectively at the ends
otally mounted upon said frame above said upper platen,
of said frame and each being mounted above said upper 10 each of said lifting assemblies having a piston rod pro
platen, each of said lifting assemblies having a lifting
jecting downwardly, means pivotally connecting each
piston rod projecting downwardly, means pivotally con
of said lifting piston rods to said upper platen, means
necting each of said lifting piston rods to the upper
for directing pressure ?uid to and from said power piston
platen adjacent the ends of said upper platen, means for
and-cylinder assembly thereby to move said upper platen
directing pressure ?uid to and from each of said power 15 selectively toward and away from said lower platen,
piston-and-cylinder assemblies simultaneously thereby to
means for directing pressure ?uid to and from the respec
move said upper platen selectively toward and away
from said lower platen, and means for directing pressure
?uid to and from each of said lifting piston-and-cylinder
assemblies simultaneously thereby to actuate said upper
platen, said lever arms and said fulcrum members dur
ing an adjustment in shut-height of said press.
tive ends of said double-acting lifting cylinders thereby
10. A press as de?ned in claim 9 wherein the attachment
of said second end of said lever to said power piston rod
comprises a pin adapted for removal during adjustment
from one shut height to another shut height of the press.
11. A press as de?ned in claim 9 wherein the attachment
of said ?rst end of said lever to said fulcrum member
comprises a plurality of pins adapted for removal dur
ing adjustment from one shut height to another shut
height of said press.
12. A press as de?ned in claim 9 wherein said means
pivotally connecting the respective said lifting piston
to support said upper platen, said lever arm and said
fulcrum member during an adjustment .in shut-height of
said press, and means for simultaneously displacing ?uid
contained within said double-acting cylinders between
the mutually non-corresponding ends thereof during move
ment of said upper platen by said power piston-and
cylinder assembly thereby to permit said respective means
connecting said lifting piston rods to said upper platen
to move equal distances in unision and to assist in main
taining said upper platen parellel to said lower platen.
14. Apparatus as de?ned in claim 13 wherein said means
for displacing ?uid between the non-corresponding ends
of said double-acting cylinders includes a valve con
trolled by-pass between the upper end of one of said
lifting cylinders and the lower end of the other of said
lifting cylinders, opening of said by-pass being adapted
rods to said upper platen includes the respective links at
to balance the ?uid supply in the corresponding ends
tached to said upper platen and to the end-most lever 35 of said lifting cylinders.
arms of said press.
13. In combination in a press having an adjustable shut
height, a frame having a vertically arranged upright at
one side thereof, a lower platen, an upper platen movable
toward and away from said lower platen while being 4 O
maintained parallel thereto, a fulcrum member adjust
ably and removably mounted upon said upright, a power
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,467,201
Shriver ______________ .. Sept. 4, 1923
1,945,879
2,356,790
Burger ____‘ ___________ __ Feb. 6, 1934
Home ______________ __ Aug. 29, 1944
123,060
Austria ______________ __ May 26, 1931
piston-and-cylinder assembly pivotally mounted at the
side of said frame opposite said upright and having a
FOREIGN PATENTS
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