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Патент USA US3027802

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April 3, 1962
3,027,792
F. J. HOHL
PUNCH CLAMPING MECHANISM FOR POWER PRESSES
2 Sheets-Sheet 1
Filed Sept. 16, 1957
Fig.1.
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INVENTOR.
Frank J. h’ohl,
'
BY
V
ATTORNEYS.
I
April 3, 1962
3,027,792
F . J. HOHL
PUNCH CLAMPING MECHANISM FOR POWER PRESSES
Filed Sept. 16, 1957
2 Sheets-Sheet 2
k
1 Wk
FJ'Q3.
INVENTOR.
Fmnfrlhbh],
ATTORNEYS
U ited States Patent 0 7
Patented Apr. 3, 1962
2
1
clamping mechanism of the present invention with the
3,027,792
PUNCH CLAMPING MECHANISM FOR
PGWER PRESSES
3,027,792
'
Frank I. Hohl, Eggertsville, N.Y., assignor to Niagara
Machine & Tool Works, Bu?alo, N.Y.
Filed Sept. 16, 1957, Ser. No. 684,195
slide of a power press shown partly in cross section;
FIG. 2 is a cross-sectional view taken as indicated by the
line II-II of FIG. 1;
FIG. 3 is a fragmentary cross-sectional view taken ap
proximately on the line lIL-III of FIG. 2; and
FIG. 4 is a view similar to FIG. 3 but with the clamping
member in a released position.
Like characters of reference denote like parts through
This invention relates to means for quickly clamping
out
the several ?gures of the drawings and the numeral 10
10
the punch assembly of a conventional die mechanism to
designates the vertically reciprocable slide of a conven
the upper platen or slide of a power press.
§ Claims. (Cl. 83-698)
Stated generally, the present invention comprises means
w
tional power press, the vertical guides thereof being desig
nated by the numeral 11 in FIG. 1. As is conventional
whereby the reciprocable slide of a power press may be
in power press construction, slide 10 is provided with
brought down to the top surface of a die assembly, that
is, to the top of the punch unit or reciprocable portion of 15 forwardly and rearwardly directed horizontal ?ange por
tions 11 and 12 which, together with the bottom surface
a die mechanism, after the die assembly has been properly
of the slide proper, form a downwardly facing platen
secured to the bed of the power press, for quickly and
surface 13 of substantial area against which the reciproca
securely clamping the punch unit to the slide in a readily
ble punch portion of a die assembly is commonly secured.
releasable manner for reciprocation thereby.
Although not limited thereto in use, the present inven 20 This securement is conventionally accomplished by screws
or bolts engaging between the platen of the slide and the
tion is particularly advantageous when employed in con
punch holder of the punch portion of the die assembly,
junction with power presses which are adapted for quick
the bottom surface or platen of the slide being commonly
die changes by means of so-called sliding bolsters. In
T-slotted for this purpose.
such presses the bolster which comprises the die-receiving
In pursuing the principles of the present invention, front
bed of the press is roughly twice as wide as in conventional 25
and rear clamp mechanisms designated generally by the
presses and is mounted for lateral sliding or rolling move
numerals 14 and 15, respectively, are mounted upon the
ment so that, while one half is in working position beneath
the slide of the press, and the press is in actual operation
with a die mounted upon such half of the bolster, the
other half is exposed at the side of the press so that a die
assembly which is to be used subsequently may be posi
tioned thereon and bolted thereto in the usual manner.
Power means are provided for shifting the bolster to
remove one die laterally from beneath the slide of the
?ange formations 11 and 12, respectively, of the slide 10.
The front and rear clamp mechanisms 14 and 15 are
identical and a detailed description of one will su?ice for
both, like characters of reference being applied to corre
sponding parts of each. Referring particularly to FIG. 2,
an elongated mounting block 20 of angular cross section
is secured against the top surface and outer edge of ?ange
press and position the other for subsequent operation. 35 11 by screws 21 and a companion block 22 is secured to
the upper surface of mounting block 20 by screws 23.
However, before the bolster shifting operation it is neces
Each of the clamp mechanisms is provided with a pair
sary to release the punch portion of the die which has
of shaft members 26 which are journalled in bushings 27
been used from the slide or platen of the press, and after
in the mounting block 20 and in roller bearings 28 in the
the bolster shifting operation it is necessary to secure the
punch portion of the new die to the slide or platen. It is 40 companion block 22. Between the bushings 27 and the
roller bearings 28 the shafts are formed with pinions 30
in this portion of die changing that the arrangement of the
for cooperation with rack members 31 in a manner which
present invention enters the picture.
will presently appear. The lower ends of the shaft mem
The present invention provides an arrangement wherein
bers 26 are threaded as at 33 and these threads engage
the release of a punch unit of a die assembly from the
slide, platen or ram of a power press and subsequent 45 internal threads in annular clamp members 34 which
have lateral clamping extensions 35.
securement of a new punch unit in place thereof is purely
Mounting block 20 and companion block 22 are hol
a push-button operation. Speaking generally, it is merely
lowed out as at 36 to receive a hydraulic cylinder 37 which
necessary, after a die assembly is properly positioned, to
in the present instance is provided with a pair of pistons
“inc ” the slide of the press down to the top surface of
38, each of which has a piston rod 39 projecting outward
the punch and operate a push-button controlled ?uid pres 50 ly
therefrom for engagement with one of the rack mem
sure valve which automatically clamps the punch unit
bers 31.
securely to the bottom of the slide. Release of the punch
Hydraulic ?uid pressure is simultaneously applied to
unit after completion of a run merely requires a reverse
ports 41 at opposite ends of hydraulic cylinder 37 for ap
push-button operation.
plying a clamping force in a manner which will presently
The aforesaid push-button operation automatically 55 appear and the pistons 38 are operated in a reverse
brings clamp members into proper clamping position with
direction by hydraulic pressure applied to a port 42 mid
way of the hydraulic cylinder 37 for effecting unclamping
more, while the operation is performed by hydraulic
movement. In the present instance the ends of hydraulic
pressure, clamping force, once applied, is maintained by 60 cylinder 37 comprise rectangular blocks 43 which, as ap
respect to the punch unit and tightens the same. Further
mechanical friction and the hydraulic pressure need not
pears at the right-hand side of FIG. 2, are mounted
be maintained to retain the parts in secure clamping con
against companion block 22 by screws 44.
Referring to FIG. 2, an adapter plate 45 of predeter
dition between clamping and unclamping operations.
mined thickness and horizontal expanse is secured to the
A single speci?c embodiment of the principles of the
present invention is illustrated in the accompanying draw 65 top surface of a punch holder that is to be attached to
slide 10 by screws or the like and in FIG. 2 the punch
ings and described in detail in the following speci?cation.
holder is indicated more or less schematically in dot and
However, it is to be understood that such embodiment
dash lines at 46.
is by way of example only and that the principles of the
FIGS. 1 and 2 of the drawings illustrate the clamping
present invention are not limited thereto or otherwise than
70 mechanisms in clamping position and the operation will
as de?ned in the appended claims.
therefore be described beginning with a position where
In the drawings:
in
adapter plate 45 is clamped between the clamping ex
FIG. 1 is a general top plan view of one form of the
3,027,792
3
4
tensions 35 of the clamping members 34 and the under
side or platen surface 13 of slide 10‘. To unclamp punch
holder 46 and its adapter plate -45, hydraulic pressure is
ally projecting clamp portions, said clam-p members being
rotatable jointly with said threaded members between
clamping and non-clamping positions with respect to said
applied to the passages ‘42 of the cylinders 37 which moves
laterally projecting die member portions, means arresting
the several pistons 3Sv outwardly or apart from each other
and moves the rack members 31 apart from each other.
?uid pressure motor means ‘for rotating the several
rotation of said clamp members in clamping position, and
The threads 33 of the lower left hand and upper right
threaded members for swinging the supported clamp mem
hand shaft members 26, as viewed in FIG. 1, are left
bers to clamping positions and thereafter drawing them
hand threads, and the threads .33 of the upper left hand
against said die member projecting portions to clamp the
and lower right hand shaft members are right hand.
10 same against said platen.
Outward movement of the rack members 31, as de
2. In a power press, a platen and means for securing
scribed in the preceding paragraph, causes the upper left
a die member thereagainst, said die member having por
hand shaft member 26 and the lower right hand shaft
tions projecting laterally from opposite sides thereof, said
member 26, as viewed in FIG. 1, to tend to rotate in a
securing means comprising clamp supporting members
counterclockwise direction and causes the upper right
?xed to opposite sides of said platen, each clamp support
hand shaft member 26 and the lower left hand shaft
ing member having a rotatable threaded member, a corre
member 26' to tend to rotate in a clockwise direction.
spondingly threaded clamp member supported on said
However, since the clamping extensions 35 are in ?rm
threaded member and having a laterally projecting clamp
clamping engagement with the under side of the adapter
plate 45, the ?rst rotative movement of the shafts 26
portion, said clamp member being rotatable jointly with
threads of the clamp members 34, whereby the several
said threaded member between clamping and non-clamp
ing positions with respect to a laterally projecting die
member portion, means arresting rotation of said clamp
members in clamping position, and ?uid pressure motor
clamp members 34 move downward as viewed in FIG. 2
means for rotating the threaded members ‘of said clamp
until the clamping extensions 35 are relieved-from clamp
supporting members for swinging the supported clamp
members to clamping positions and thereafter drawing
them against said die member projecting portions to clamp
produces an unscrewing movement as between the
threaded portions 33 of such shafts and the internal
ing and frictional engagement with adapter plate 45.
After this frictional contact is relieved the several clamp
members 34 rotate with their mounting shaft members 26
the same against said platen.
to swing outwardly to disengaged positions, as illustrated
3. In a power press, a platen and means for clamping
in FIG. 4.
30 a die member thereagainst, said die member having lat
Rotation of the clamp members 34 in opposite direc
erally projecting means adapted to, be clamped to said
tions between the clamping and non-clamping positions
platen, said clamping means comprising clamp support
thereof is limited to approximately 90 degrees in either
direction by stop means best shown in FIGS. 3 and 4.
Referring ?rst to FIG. 2, the lower ends of bushings 27
ing means fixed to said platen, said clamp supporting
means having-a plurality of rotatable threaded members,
correspondingly threaded clamp members supported on
are disposed in bosses 47 which project downwardly from
said threaded members and having laterally projecting
clamp portions, said clamp members being rotatable joint
the mounting block-s 20. The lower faces of the bosses
47 are arcuately notched as at 48, and stop lugs 49 on
the clamp members 34 engage the opposite ends of the
notches 48 to limit rotative movement of the clamp mem
bers.
The axial thrust engendered by clamping is borne by
axial thrust anti-friction bearings 50 which transfer the
ly with said threaded members between clamping and
non-clamping positions with respect to said laterally pro
jecting die member means, means arresting rotation of
said clamp members in clamping position, and ?uid pres
sure motor means for rotating the threaded members for
axial clamping thrust from the lower faces of the’ pinion
swinging the supported clamp members to clamping po
sitions and thereafter drawing them against said die
formations 30 to the upper ends of the bushings 27.
Clamping action, after a die is moved into a desired
member projecting means to clamp the same against said
operative position beneath slide 10, is effected by ap
platen.
4. In a power press, a platen and means for securing
plying hydraulic ?uid pressure to the passages 41 which
a die member thereagainst, said die member having
moves the rack members 31 relatively toward each other.
portions projecting laterally from opposite sides thereof,
During this movement of the rack members .31 the clamp
said securing means comprising clamp supporting mem
members 34 turn with their respective shaft members
bers ?xed to opposite sides of said platen, each clamp
26 from the position of FIG. 4 to the position of FIG. 3.
supporting member having a pair of rotatable threaded
As the stop lug 49 of each clamp member 34 reaches an
members spaced therealong and ?uid pressure piston and
end of notch ‘48 and its turning movement is arrested, the
cylinder means disposed ‘generally between said threaded
threaded portions 33 of the shaft members turn in the 55 members, rack members at opposite ends of said piston
clamp members 34 ‘and draw them up into clamping rela
and cylinder means and adapted to be projected and re
tion, the tightness of such clamping being determined by
tracted thereby, pinions on said threaded members mesh
the magnitude of the hydraulic pressure force.
ing with said rack members to be rotated thereby, cor
After the clamping operation is completed, hydraulic
respondingly threaded clamp members supported on said
pressure need not be maintained, since the clamped con
threaded members and having laterally projecting clamp
dition is frictionally maintained by the screw thread en
portions, said clamp members being rotatable with said
gagement between the shaft members 26 and the clamp
threaded members between clamping and non-clamping
positions with respect to said laterally projecting die mem
members 34. This provides a more certain, safe and
ber portions by actuation of said rack members, means
effective clamp than one which depends on the mainte
nance of pressure during the entire clamping period, and 65 arresting rotation of said clamp members in clamping
position, said ?uid pressure means being thereby oper
is also simpler and more economical.
able to simultaneously rotate the several threaded mem
What is claimed is:
bers to swing the supported clamp members to clamping
positions and thereafter draw them against said die mem
tions‘projecting laterally from opposite sides thereof, said 70 ber projecting portions to clamp the same against said
1. In a power press, a platen and means for securing
a die member thereagainst, said die member having por
securing means comprising clamp supporting members
?xed to opposite sides of said platen, each clamp support
ing member having a pair of rotatable threaded members
spaced ther'ealong, correspondingly threaded clamp mem
bers supported on'said threaded members and having later 75
platen.
5. In a power press, a platen and means for securing
a die member thereagainst, said die member having lat
erally projecting means adapted to be clamped to said
platen, said vsecuring means including a clamp support
3,027,792
5
ing member ?xed to a side of said platen, said clamp
supporting member having a pair of rotatable threaded
members spaced therealong and ?uid pressure piston and
cylinder means disposed generally between said threaded
members, rack members at opposite ends of said piston
and cylinder means and adapted to be projected and re
tracted thereby, pinions on said threaded members mesh
6
said clamp members in clamping position, and motor
means for moving said rack means to simultaneously
rotate the several threaded members to swing the sup
ported clam-p members to clamping positions and there
after draw them against said die member projecting por
tions to clamp the same against said platen.
8. In a power press, a platen and means for securing
a die member thereagainst, said die member having lat
erally
projecting means adapted to be clamped to said
respondingly threaded clamp members supported on said
platen, said securing means including a clamp sup
threaded members and having laterally projecting clamp 10 porting
member ?xed to a side of said platen, said clamp
portions, said clamp members being rotatable with said
supporting
member having a threaded member mounted
threaded members between clamping and non-clamping
for rotation on an axis perpendicular to said platen, rack
positions with respect to said die member projecting
ing with said rack members to be rotated thereby, cor
means by actuation of said rack members, means arrest
means and a pinion on said threaded member meshing
ing rotation of said clamp members in clamping position, 15 with said rack means to be rotated thereby, a corre
spondingly threaded clamp member supported on said
said ?uid pressure means being thereby operable to si
threaded member and having a laterally projecting clamp
multaneously rotate the several threaded members to
portion, said clamp member being rotatable with said
swing the supported clamp members to clamping posi
threaded member between clamping and non-clamping
tions and thereafter draw them against said die member
projecting means to clamp the same against said platen. 20 positions with respect to said laterally projecting die
6. ‘in a power press, a platen and means for securing a
w
member means by actuation of said rack members, means
arresting rotation of said clamp member in clamping
die member thereagainst, said die member having lat
position,
and motor means for moving said rack means
erally projecting means adapted to be clamped to said
to rotate the threaded member to swing the supported
platen, said securing means comprising a clamp support
ing member ?xed to said platen, said clamp supporting 25 clamp member to clamping position and thereafter draw
the same again-st said die member projecting means to
member having a rotatable threaded member and fluid
clamp the same against said platen.
pressure piston and cylinder means 'for rotating the same,
9. ‘In a power press, a reciprocable platen and means
a rack member at an end of said piston and cylinder
for securing a punch holder against the under surface
means and adapted to be projected and retracted there
by, ‘a pinion on said threaded member meshing with said 30 thereof, said punch holder including portions projecting
horizontally from opposite sides thereof, said securing
rack member, a correspondingly threaded clamp mem
means comprising clamp supporting members ?xed to
ber supported on said threaded member and having a
opposite sides of said platen, each clamp member hav
laterally projecting clamp portion, said clamp member
ing a pair of screw members spaced therealong and pro
being rotatable with said threaded members between
clamping and non-clamping positions with respect to said 35 jecting downwardly therefrom, internally threaded clamp
members supported on said screws and having horizon
laterally projecting die member means by actuation of
tally projecting clamp portions, said clamp members being
said rack member, means arresting rotation of said
rotatable jointly with said screw members between clamp
clamp member in clamping position, said fluid pressure
ing and non-clamping positions, means arresting rota
means being thereby operable to rotate the threaded
member to swing the supported clamp member to clamp 40 tion of said clamp members in clamping position, and
?uid pressure motor means for simultaneously rotating
ing position and thereafter draw the same against said
the several screw members selectively in either direction
die ‘member projecting means to clamp the same against
for swinging the supported clamps to their clamping
positions and thereafter drawing them upwardly against
die member thereagainst, said die member having por 45 said punch holder projecting portions to clamp the same
or vice versa.
_ ',
tions projecting laterally from opposite sides thereof,
said platen.
7. 'In a power press, a platen and means for securing a
said securing means comprising clamp supporting mem
bers ?xed to opposite sides of said platen, each clamp
supporting member having a pair of rotatable threaded
members spaced therealong, rack means and pinions on 50
said threaded members meshing with said rack means
to be rotated thereby, correspondingly threaded clamp
members supported on said threaded members and hav
ing laterally projecting clamp portions, said clamp mem
References Cited in the ?le of this patent
UNITED STATES PATENTS
241,617
1,412,170
2,22A,708
Chapman ______ _,...,__, May 17, 1881
Dixon ______________ .. Apr. 11, 1922
Sittert ______________ .._ Dec. 4, 1940
2,695,788
2,755,758
Baier _______________ __ Nov. 30, 1954
Johansen ____________ __ July 24, 1956
605,008
Great Britain ________ __ July 14, 1948
831,602
Germany ,__p_4_ ________ __ Feb. 14, 1952
bers being rotatable with said threaded members be 55
tween clamping and non-clamping positions with respect
to said laterally projecting die member portions by actua
tion of said rack members, mean-s arresting rotation of
FOREIGN PATENTS
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