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Патент USA US2118098

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May 24, 1938.
P. v. J. MERENDA
PRESS
Filed‘ Nov. 9, 1956
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54
74
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I 2,118,098
Patented May 24, 1938
2,118,098
UNITED STATES PATENT _OFFICE
2,118,098
` PRESS
_ Paul V. J. Merenda, Fontenay-aux-Roses, France,
assignor to The Turner Tanning Machinery
Company, Portland, Maine, a corporation of
Maine
Application November 9, 1936, Serial No. 109,824
,
In Germany November 29, 1935
' `
(Cl. 121-38)
5 Claims.
4 This invention relates to presses and is illus
cave upper surface for the reception of a con
trated as embodied in a press particularly adapt
ed to smooth-plating and embossing operations
vexly rounded portion of a vplaten member 8 hav
ing formed integrally therewith a platen -III
upon hides, skins and leather. It is to be under- ' adapted to co-operate with an upper stationary
5 stood, however, that the invention and various im
portant features thereof may have other appli
platen I2 carried by a head I4. Below the large
cylinder 4v is a smaller cylinder I6V having a cyl
cations and uses.
inderchamber I8 which communicates with the
r
'
'I'he present invention is an improvement upon
he press disclosed in United States Letters Pat
1 ,ent No. 1,932,556, granted October 31, 1933, upon
chamber 5 of the cylinder >4. Movable in the
cylinder I6 is a smaller piston 20 having extend
ing _completely therethrough a bore 24, the upper
application of P. V. J. Merenda.
It is an object of this invention to facilitate
portion of the bore being restricted in size toV form , 10
and expedite the return of the platen and platen
operating pistons toward their lower or initial
positions in a press of the type disclosed in the
2D has a surface ~portion around the vent 26
which is machined nat and contacts `a similar ilat
surface on the lower end of the large piston 6.
Hence the vent 26 is normally closed while the 15
said patent.
'
'
-
a vent 26. As shown, the upper end of the piston
To these ends, and in accordance with an im
press is at rest and during all of the time that
portant feature of the invention, the movable the pistons 6 and 20 are rising toward pressure
platen of a press is arranged to be operated by a \ applying position and also during all the time
20 large piston and by a smaller piston which not that pressure is being applied to a given piece -.
only'moves the large piston during upward move
of work. In addition, the upper end of the piston 20
ment of both pistons and controls the application 20 has an annular surface 21 against which pres
of pressure by the pressure medium to the larger sure may be exerted in a downward direction by
piston, as in the-patented construction, but will the pressure medium to move this piston down
25 also pr`ovide by its construction for release of wardly when pressure is removed in thechamber
pressure' below the large piston and also the actual I8 to cause opening of the press. Extending lat 25.
discharge of the pressuremedium from the cham
erally from the bore 24 of the small piston 20 are , '
ber below the large piston, thus facilitating and ports 28, these ports serving a purpose which
expediting the return of the large piston and of will later be explained herein.
,
30 the platen carried therebyjto their'initial or lower
Opening into the chamber 5 of the cylinder4
positions. For this purpose the small piston is is a pipe 30 leading to a‘valve box 32` in which is 30
provided with a bore or'other passageway which a valve 34 normally held in closed position by a
extends in line with its axis the full length of the spring 36, the latter being engaged with a disk
small piston, the result being that the pressure member 38 rigidly secured to stem 40 which car
35 medium below the large piston may escape
ries the valve 34. As shown, this stem 40 of the
through. the passageway „thus afforded in the valve 34 extends through the valve box 32 a sub 35
small piston, this operation taking place prompt
stantial distance in an upward direction so that
ly upon release of pressure in the'cylinder back said valve may be controlled by a lever 42 pivoted
of the small piston through the opening of a valve at 44 to the upper end of a link 46 in an arrange
40 under control of the operator.
ment wherein the free end of the lever 42 is piv
These and other features of construction and otally received within a socket 48 carried by a 40
novel combinations of parts will now be pointed bracket 5U secured to the upper end of the large
out- ìn detail in the specification yand then pointed piston 6. It will be readily understood that as
out more particularly in the appended claims.
’
the large piston descends from its uppermost po
sition, shown in Fig. 1, the lever 42 is operated to
Fig. 1 is a front view, partly in section, of the cause depression of the stem 40 and Vits valve 34 .45
whereby the pressure medium (e. g. water or oil)
essential elements of a press illustrating one em
Within the cylinder chamber 5 may readily escape
bodiment of the invention; and
Fig. 2 is a sectional view illustrating another through the pipe 30 and through a second pipe
species of the invention.
i
In the illustrated press, which is` specially de
signed for smooth-plating and embossing opera
tions upon hides, skins and leather, there is pro
` vided a cylinder 4 having a chamber 5 for the re
ception of a relatively large piston 6 having _a con
52 to a reservoir (not shown).
Opening into the chamber I8 of the lower cyl- 2
inder I6 is a pipe 54 `through which the pressure
medium may be introduced into the cylinder I6
. or removed therefrom.
,
In that species of the invention'shown in Fig.
2, a small piston 60 has a chamber 62 somewhat 55
2,118,098
larger than the corresponding chamber 24 of the
piston 28.A However, the chamber 82 lhas a vent
84 at its upper end similar in all respects to the
vent 28 leading from the chamber 24 in the pis
ton 28. Moreover,ïpiston 88 has an annular sur
face 85 _for the same purpose as the correspond'
`ing surface 21 on piston 28~ (Fig. 1). 'I'he lower
end of the piston 88, in Fig. 2, is screw threaded
interiorly to receive a closure inember> 88 which is
provided with a number of `ports 68. 'As shown
the closure member 88 has also _an opening cen
tral therethroughY for- the slidable reception of a
rod 18 having an enlarged head 12 which oper
ates as a stop to limit upward movement of the
15 small piston 88... Conveniently 'the rod 18 is ex
tended through the lower end wall 14 of the
small cylinder I8 and is provided with' a nut 18
-adjustably screwed thereon and operative to hold
chamber 5 which, acting on the surface 21,
forces, the ‘small piston 28'downwardly. /It fol
lows that to the vent 28 is opened upon the
instant that» the piston 28 starts to descend
relatively to the piston 8. Hence the pressure
medium may escape through the vent 28 and
through the bore 24 of the small piston 28. _
In this way and bythe special construction of the
small piston, the return of the large piston to
ward its lower position is substantially expedited.
>Normally the piston 28 _continues to descend'
faster 7than the large piston 8, it being understood
in this connection that, unlike piston i8, there is
no packing about the piston 28, the latter having
a snug running nt in the cylinder I8. However,
piston 8 also descends and soon causes opening
of the valve at 34 through the operation of the
lever 42, thus adding another exit for the pres- »
the rod 18 at a predetermined position within
sure medium in the chamber 5.
and particularly of the controller member and
piston, it follows that the range of thicknesses
'valves vwhich enable the operator to control the
of the pieces of work to be treated must _be known `
'
_
_
Since the~ports 28 in the piston y28\occupy a
the cylinder I8.
'
_ v For a'more detaileddescription of this press, _ predetermined position in the length of the said
press, reference should be hadl to said Patent No.
1,932,5_56.j
_
'
_
'
_
_
and adhered to, it being obvious that apiece o!
work thicker than this said range- of thicknesses,
.In` the operation of .the press shown in Fig.1,
would prevent the ports 28 reaching operative
the pressure medium (usually oil -or water) is
positionand hence the desired heavy pressure
could not be applied within any reasonable time
through the pressure medium ’in the chamber
introduced' into the cylinder I8 through‘thepipe
54 under pressurel by a pump (not shown) upon
proper.v ma'nipulatior'i- of a control member for a
valve, also notl shown. ~While thelpl'ess was at
rest, the lower end ofthe piston l28 was main
tained above the level of the opening of the
rpipe 8_4 _by a spring device indicated ät 88“,- the
'arrangement being such that the large piston 8
rested upon the upper end of the small piston 28.
Hence, when the pressure Ymedium is introduced
under pressure into the chamber I8, the small
piston is forcedupwardly carrying _with it the
20
5. For this reason there has been provided an
30
other construction oi’ the small piston, namely,
that shown in Fig.v 2, wherein the ports 84 and 88,
become eiïective to transmit pressure to the
pressure medium inl the large- chamber 5 when
the small piston 68 is held from moving upward 35
ly beyond a certain predetermined point by the
head-12 of the rod 18. In this case the pressure
medium passes through the ports 88 through the
bore 812 .and vent 84 to the chamber 5 whereby'
heavy pressure is applied to the piston 8, it be-4 40
large piston 8, there'being no escape of the pres
sure mediumthrough the vent 28 which is closed _ ing possible to make very readily any desired
through the contacting surfaces on the pistons 8 `
and 28, as already described. During upward
movement of the pistons 28y and 8, the pressure
medium is drawn into the chamber 8 of the large
adjustment _or the rod 18, by proper manipula
tion of the nut 18, and hence of the position
ofy the small piston at'which pressure will be
applied to the large piston 8. In fact, the de 45
sired adjustment may be made with the press in
cylinder 4 fromaI reservoir (not shown) . through
the pipes 8l and 52, since the valve 34 is open _ operation. It will be understood that vsmallpis
during practically all 'of the upward movement ton 88 is stopped by head 12 ofrod 18 just at the
of the large pistón‘8. Atthe beginning of the ' instant the piece of work on the platen I8 con
pressure applying operation upon a piece oi' work tacts- the platen I2 and before application of pres
between th'e platens- I8 and I2, the ports 28 in the sure to the work piece. Hence the pressure me-`
piston 28 come into place above the floor ci the
chamber .5 so that the pressure, -which up- to this
dium may be forced through the vent 484 whereby _
due to the very much increased area,-that of the
that of chamber I8, since the vent 84 is uncovered 60
when the piston,8 and platen I8 are in their up
pressure is applied in the chamber 8 to large
time has been con?ned to the chamber I8' of the _, piston 8. Otherwise, the press embodying the
small cylinder I8, is now transmitted through the piston 88 operates in a manner similar to the
ports 28 to the pressure medium in the chamber. press containing the piston 28. -Upon releasing
pressure in the chamber I8 (Fig. 2) to terminate
I of the large cylinder 4, thus causing theapplica
applying operation, the pressure vin
tion of heavy. .pressurèupon the lower platen I8 athepressure
chamber 5 instantly. drops substantially to
lower suriaceot the large piston 8, now sub
jected to pressure by the pressure medium. _It
will be understood that the instant that pressure
was applied through the ports 28 to the pres
permost pressure applyingipositions. Hence the
pressure medium in chamber 5 escapes through . i
the passageway in the smalll piston 88 to the
chamber I8. Since some portion of the pressure
closed» Pressure is thus maintained between-the 'medium
flows over ythe topmost surface of the
platens I8 and I_2' for anydesired“ length of time.
piston
88
escapes from lthe chamberv 8U
When the operator decides that the work piece downwardlyand
through vent 84, there is a distinct
has received propentreatment, a controller mem
ber (not shown) is operated to open'a release tendency for the pressure in themedium about
valve in a pipe _leading from the chamber I8. the vent 84 to drop, so that pressure on the upper "
ilat surface of the piston 88 is less than it ‘would
'This results in an instantaneousdrop in the pres
sure medium in the chamber 5. the valve 84 was
sure in the chamber I8 with the result that both be were there no`vent.l Probably there is only
y pistons 8 and 28 descend until ports 28 are closed. small downward pressure on the__topmost surface
The weight _of the piston 8 and superposed platen l of the piston. Hence, there is an advantage in
~ I8 produces, pressure in the medium in the providing this »piston 88 with an annular surface
2,118,098
65, away from the vent 6I, upon which pressure
may be exerted in a downward direction by the
pressure medium in the chamber 5, the pres
sure in the chamber 5 being due to the weight
Ul
of the piston G and superposed ‘platen I l). 'I‘he
piston 60 descends, ahead of the piston 6, by.
reason of its own weight aided bythe pressure on
the surface 65. Hence the passageway in the
piston 60 serves for the discharge of thel pres
lo
sure medium in chamber 5, (Fig. 2,)- to insure that
the piston 6 may descend promptly4 to effect open
ing of a valve, corresponding to valve 34 (Fig. 1),
whereby the medium in chamber 5 may be evacu
ated.
Having described my invention, what I claim
as new and desire to secure by Letters Patent of
the United States is:
1. In a hydraulic press, a movable platen, a
cooperating platen, a large piston supporting the
20 movable platen to operate the latter, a cylinder
in which the piston is movable, a small cylinder
below the large cylinder and communicating
therewith, and a small piston in said small cyl
inder having abore extending therethrough- sub
= stantially parallel to its axis, said small piston
having further a ilat upper end surface to con
tact a similar ñat surface on the lower end of
the large piston whereby theupper end of the
bore in the small piston is closed while both pis
30 tons are in their lowermost position and also dur
ing upward movement of the pistons, caused by
pressure 'behind the small piston to effect closing
of the platens as a preliminary to the application
of heavy pressure to the work piece in the press,
35 and said bore in the small piston serving as a pas
sageway for the escape oi the pressure medium
from the large cylinder upon release of pressure
in the small cylinder.
l
2. In a hydraulic press, a movable platen, a
40 cooperating platen, a large piston supporting the
movable platen to operat-e the latter, a cylinder
in which the piston is movable, a small cylinder
below the large cylinder and communicating
therewith, and a small piston in the small cylin
45 der having a iiat upper end surface to contact
3
from the large cylinder upon release of pressure
in the small cylinder.
3. In a hydraulic press, a movable platen, a
cooperating platen, a large piston supporting the
movable platen to operate the latter, a cylinder
in which the piston is movable, a small cylinder
below the large cylinder and communicating
therewith, a small piston having a ñat upper end
surface to contact the lower end surface of the
large piston and having further a chamber ex
tending throughout the greater part of thelength f
of said small piston with an opening onto the
said iiat upper end surface of the small piston,
said opening being normally closed by said large
piston, a rod extending through the lower end
wall of the small piston into the chamber thereof '
and having an enlarged end to serve _as astop to
limit the upward movement of the small piston,
and the lower end wall of the small piston hav
ing a number. of ports furnishing permanently 20
open passageways between said small cylinder
and the chamber of the small piston whereby the
pressure medium is always free to pass in one
direction or the other between the small cylin
der and the chamber of said small piston, the 25
arrangement being such that the pressure medi
um passes promptly from the large cylinder
through the small piston to the small cylinder
upon .release of pressure in the small cylinder.
4. In a hydraulic press, a movable platen, a 30
cooperating platen, a large piston to operate the
movable platen, a cylinder in which the piston is
movable, asmall cylinder in line with the large
cylinder and communicating therewith, and a
small piston movable in said small cylinder and 35
having a passageway therethrough from one end
to the other, said small piston having further a
flat end surface upon which said passageway
opens and adapted to contact a similar iiat sur
face on the adjacent end of the large piston 40
whereby that end of said passageway in the small
piston is closed while both pistons are moving to
gether, and said small piston having also an an
nular surface at the same end as the said ñat sur
face and at one side of the plane of said fiat 45
' surface.
with the flat lower end surface of the large pls
ton when the latteris in its _lowermost position,
5. In a hydraulic press, a movable platen, a 'b
said small piston having a bore extending cooperating platen, a large piston supporting the
throughout its length and opening flush on the movable platen to operate the latter, a cylinder
50 said upper end surface of the small piston where
in which the piston is movable, a small cylinder
by the upper end of the bore is closed bythe below the large cylinder and communicating' 50
large piston, a pressure medium being applied therewith, and a small piston in said small cylin- .
, under pressure to the lower end of the small pis
ton whereby the latter is caused to rise and to lift
55 also‘the large piston, said small piston having a
port opening- laterally from its- bore and opera
tive at a certain point in the upward movement
of the small piston to transmit pressure from the
pressure medium in the small cylinder to that in
60 the large cylinder whereby the large piston is
der having a passageway therethrough from one
end to the other, said small piston having fur
ther a flat upper end surface to contact a similar 55
flat surface on the lower end of the large piston
whereby the upper end of said passageway'in the
small piston is closed while both pistons are mov
ing'upwardly together and while pressure is being
applied to a work piece, and said small piston 60
moved upwardly under heavy pressure substan
having also an annular beveled-off surface at its
tially at the end of its upward movement, and` upper end below the -plane deñned by said flat
said bore in the small piston serving as a pas
surface at the upper end of the small piston.
sageway for the escape of the pressure medium
PAUL V. J. MERENDA.
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