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Jan. 7, 1947. '
A..BOLDUC
I
2,413,944
DIE REMOVING DEVICE
Filed Jan. 25, 1945
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INVENTOR.
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BY
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57774513059163
4
Patented Jan. 7, 1947
‘2,413,944
UNITED STATES PATENT OFFICE
2,413,944
DIE REMOVING DEVICE
Albert Bolduc, Detroit, Mich.
Application January 25, 1945, Serial No; 574,589
9 Claims.
1
(01. 1644118)
The invention relates generally to dies adapted
to cooperate with punches for perforating sheet
Fig. 5 is a cross-sectional view illustrating a
hand. ‘device for removing ‘dies held in‘holders by
a spring-pressed locking element.
metal or the like, and it has particular relation
to a device for removing the dies from holders
Referring to Fig. 1, the ‘mechanism illustrated
therefor.
comprises an upper platen it] having a punch
In certain respects, the invention is related to
holder or block it secured iby‘screws l2 to the
and constitutes an improvement over the inven
‘platen. The block or holding member H has an
tion in my copending application for patent,
opening 14 ‘adapted ‘to receive ‘a punch (not
Serial No. 544,792, ?led July 13, 1944.
shown) , and for releasably holding the punch in
As stated in the copending application for pat 10 position a spring-pressed ball device is employed.
ent, it is conventional to use a die element and
a punch which are, respectively, anchored on rel
atively movable parts of a machine. The die is
held in an opening in a holding plate or member
and perhaps usually is press ?tted in the opening
This device comprises a ball I5 movable in a bore
it in the block and which normally is urged
‘towards the opening 14 by a spring ii. The ball
normallyengages a‘groove or recess in the punch
and upon upward movement of ‘the latter, the
in order to positively resist displacement during
may be releasably held in the opening by means
ball through a wedging action prevents the punch
from being pulled out of the opening. To enable
pushing the ball upwardly when the punch is to
of a spring-pressed ball in the holder which is
be removed, a small opening I9 is provided at the
use of the machine. In some instances, the die
adapted to seat in a groove or recess in the die. 20 lower end ‘of the bore Hi, and by pushing a pin
The copending application for patent is concerned
with a device for pulling the die out‘of the open~
ing without removing the holder from the ma
chine, and generally includes a shank insertable
into the die opening and provided with expand
, the punch so as to permit withdrawal of the lat
improvements in a device for this purpose which
consequently if the die is to be removed or re
or other suitable instrument, upwardly through.
the opening IS, ‘the ball maybe lifted away from
ter.
The lower part of the mechanism comprises a
able means for engaging the die in order to re
base 20 having a block 2! r'eleasably fastened
move it upon a reverse movement of the shank.
thereto ‘by devices '22. 'On the upper side of this
One object of the present invention is to pro
block,_ a die holder 23 is fastened by screws 24
vide an improved device for removing the die
and this holder has an ‘opening 26 for receiving a
while leaving the holder in place on the machine 30 die '21‘. In “the structure‘ shown, the die *2’! is
wherein an improved expandable means is pro
sufficiently press ‘?tted into the opening 26 that
vided on the shank for engaging the die.
normally it will not be ‘removed by any forces oc
Another object of the invention is to provide
curring during operation of the machine, and
includes means for releasing the springepressed 35 placed, considerable force is required to eiiect
ball or other locking device at the same time that
the shank is inserted into the die opening.
Other objects of the invention will become ap
such removal. It is to be noted that the die ‘has
an opening 28 through which the punch operates
and that ‘below this opening a larger diameter 29
parent from the following speci?cation, from the
is provided. At the junction of the two diam
drawing relating ‘thereto, and from the claims 40 eters, a slightly rounded annular shoulder 36
For a better understanding of the invention,
reference may be had to the drawing wherein:
is present.
The present invention comprises shank means
indicated generally at 3!, which includes an ele
Figure 1 is a vertical View, partly in cross sec
ment 32 having a lower tubular portion 33 and
hereinafter set forth.
'
tion, illustrating an apparatus according to one‘ 45 a solid upper end portion 34 disposed in the open—
form of the invention;
ing 14. ‘The outer peripheral surface of this
Fig. 2 is a cross-sectional view taken substan
solid end ‘portion has‘a groove or recess 35 adapt
tially along the line 2—2 of Fig. 1;
ed to receive the ball F5 in order to hold the
Fig. 3 is a cross-sectional View illustrating a
shank means in‘ the ‘opening 14, and the relation
different form of the invention which particularly
between the‘ shank means, spring-pressed ball,
is adapted to removing a die having a tapered
and holder H is substantially the same as be
opening;
tween the normally used punch, spring-pressed
ball, and holder. In other words, by lifting the
.Fig. 4 is a similar cross-sectional View illustrat
ing another form of the invention adapted ‘also
to remove a die having a tapered opening; and .
55
ball, the shank ‘means 131 can be readily substi
tuted for the ‘punch. A‘second recess or groove
2,413,944
4
in this manner the die can be separated from the
31 is shown which adapts the shank means for
use in connection with another type of punch
shank means.
It might be observed at this
In the construction shown by Fig. 3, a die 60
is shown having a, gradually tapering inner sur
face 61 and in this case the ring 4'! is moved
entirely through the die opening to engage under
its lower surface as indicated at 62. Upon up
time that the upper end of the opening in the
ward movement of the platen, this engagement
tubular portion 33 does not generally extend past
will remove the die substantially in the same
manner as previously mentioned. The shank
means in this case comprises a sleeve 63 on a pin
64 and the pin has a reduced threaded upper
end 65 which is threaded into a holder G5. In
holding means.
A second part of the device comprises a pin 38
which has its upper end threaded into the
threaded upper end of the tubular portion 33
as indicated at 4i].
the groove 35 so that‘ the shank means 32 has a
solid resistance to any crushing forces which
might be applied against the shank by the ball
due to the wedging action mentioned. At its
general, operation of the device shown in Fig. 3
lower end, the pin 33 has a frusto-conical head
43 and the larger diameter of the head is slightly 15 is the same as that shown in Fig. 1.
In the structure shown by Fig. 4, the same
smaller than the diameter of the die opening 28
die is illustrated, but in this vcase instead of en
so that the pin can readily move downwardly
gaging the die by shoulders, a ring 66 is employed
through the die opening. It will be noted that
which has an outer conical surface 61 adapted
the lower end of the tubular portion 33 termi
nates substantially above the frusto-conical head 20 to be forced against the tapered die opening.
The inner surface of the ring is tapered substan
43 so as to provide an annular shoulder 44.
tially to fit the tapered end of the pin 64 and it
The tapered wall of the head 43 and the shoul
aZso will be noted that the lower end of the ring
has a frusto-conical outer surface 19 adapted to
end of the pin 38 and in this space a split ring
41 is provided. This ring has a conical inner 25 act as a piloting surface when the ring is moved
downwardly through the die opening. Hence,
surface 48 which may substantially ?t the head
generally, the ring in this case is diiferent from
43 and this inner surface of the ring joins at its
that shown in Fig. 1 in that the outer surface of
upper end a cylindrical inner surface 49. The
the ring not only has a piloting frusto-conical
outer surface of the ring is also frusto-conical,
surface, but it also has a reversely directed sur
as illustrated at 50, but the slope is opposite to
face 61' adapted to be wedged tightly against the
the surface 48. At its larger and upper end, the
die. The wedging relation between the parts as
surface 50 joins an annular shoulder 5i extend
the shank is pulled upwardly locks the die to the.
ing radially inwardly on the ring and at the inner
shank and in this manner it is removed.
edge of this shoulder, the ring has a cylindrical
In the construction shown by Fig. 5, the die is
wall 52. The split in the ring is indicated at 54
held in a holder ‘H by means of a spring-pressed
in Fig. 2.
ball 12 on the order of that provided in Fig. 1 for
With the parts assembled and the shank mean-s
the punch. The die indicated at 13 has a groove
3i carrying the ring 4‘! disposed above the die
or notch 14 for receiving the ball 12 and the ball
21, the ring is free to move axially between'the
surface 48 and the shoulder 44 and to contract 40 may be pressed downwardly to release the die
by inserting a pin through an access opening 75
in dimensions when moved upwardly towards the
in the holder ‘H. The die otherwise may be the
shoulder. When the platen I0 is moved down
same as that shown in Fig. 1. The shank means
wardly, the head 43 on the pin 38 enters the die
includes a pin 16 and sleeve 71 on the order of
opening 28 and the smaller end of surface 50 on
the ring strikes the edge of the opening and 45 those shown in Fig. 3, but the pin in this case is
threaded into a hand-holding element 18. This
movement of the ring is interrupted. Continued
hand-holding element at one side of the pin 16
movement of the shank meansv downwardly
has a threaded opening ‘E9 in which a plug 8| is
causes the shoulder 44 on the shank means to
threaded and the plug has an opening 82 extend
engage the upper end‘of the ring and to force it
ing vertically in offset or eccentric relation to the
through the die opening and during this move 50 axis of the plug. This opening receives a plunger
ment the ring contracts as the tapered surface
84 having a lower end adapted to enter the open
50 moves through the die opening. It should be
ing 15 and press the ball 12 downwardly and the
understood that the dimensions are such that
upper end of the plunger 84 has a knob 85 by
the ring can pass through the die opening through
means of. which the plunger may be pressed
its resilient contracting and that the size of the 55 downwardly.
split 54 and dimensions of the ring and pin 36
It should be evident that if the hand-holding
are such as to permit sufficient contraction of the
element 18 is pressed downwardly so as to move
ring so as to allow its movement through the die
the pin and ring through the die opening, the pin
der 44 provide a recess or groove at the lower
opening.
60 84 can at the same time be moved into the open—
As soon as the larger end of the surface 50
passes the lower end of the die opening 28, the
inherent resiliency of the ring expands it so as
to move the shoulder 5| under the shoulder 30.
Now, upon reverse movement of the platen, the
65
engagement of the shoulders stops the ring from
moving and the head 43 forcefully expands the
ring against the wall of the die with the shoulder
51 under the shoulder 30. Continued movement
of the platen upwardly, after the ring has ex 70
panded as much as it can, will cause the ring
and die to move with the pin and hence, to be
moved out of the opening 26. After the die is
thus removed, the pin can be removed from the
tubular shank member 33 by unthreading it and
ing 15 so as to press the ball 12. When the pin
84 has been moved to release the die, reverse
upward movement of the hand device locks it to
the die so as to pull it from the opening. It
might be mentioned that in such cases where the
die is held by a springepressed ball, the die will
have a close ?t with the opening of the holder,
but ordinarily this ?t will not be a press ?t and
the hand device can be used to pull the die out
of the opening. The plug 8| may be turned so as
to shift the pin 84 relative to the pin 16 since the
pin 84 is eccentric to the plug BI, and this is de
sirable so as to enable adjusting the location of
the pin 84 in the event the opening 15 in the die
holder varies in location.
5
12,413,944
6
Although more than one form ‘of the invention
face 'on' itlie'elei'ne'nt ‘st “as to create expansion
has been illustrated and described in detail, it
will be apparent to those skilled in the art that
various modifications may be made without de
parting from the scope of the claims.
What is claimed is:
l. A device for pulling a die element or the'
forces on the element.
7
>
5. A device for pulling a die element or the like
out of a holder wherein the element has a die
opening terminating at itsinner end in a sub
stantially radial, ‘outwardly directed shoulder,
comprising a shank adapted to be moved through
the opening, a radially expansible and con
die opening terminating at its inner end in a
tractible ring element on the shank, and abut~
substantially radial, outwardly directed shoulder, 10 ments at each axial-end of the element and spaced.
comprising a shank adapted to be moved through
a distance greater than the axial length of the
the opening, a split resilient ring on the shank,
element to ‘allow the latter to slide between the
and abutments at each axial end of the ring to
abutment‘s, one of the abutments being adapted
to press the element through the die opening
press the ring through the die opening when the
when the shank is moved into the opening and
shank is moved into the opening and to pull the
the other abutment being adapted to pull the
ring when the shank is moved reversely, said ring
element when the shank is moved reversely, said
being substantially shorter in an axial direction
ring element having a frusto-conical outer sur
than the distance between the abutments and
face converging towards said other abutment.
being of such radial dimensions that it will resil
6. A device for pulling a die element or the like
iently contract when pressed into the die open 20
out of a holder wherein the element has a die
ing and being provided with a circumferentially
opening terminating at its inner end in a substan
extending rabbeted portion adapted to expand
like out of a holder wherein the element has a
tially radial, outwardly directed shoulder, com
into engagement with said shoulder after suf?
cient movement of the ring through the open
prising a shank adapted to be moved through the
25 opening, a radially expansible and co-ntractible
mg.
2. A device for pulling a die element or the like
out of a holder wherein the element has a die
opening and is held in a holder by a releasable
lock accessible for release through an aperture 30
in the holder adjacent the die, which comprises
ring element on the shank, and abutments at each
axial end of the element and spaced a distance
greater than the axial length of the element to
allow the latter to slide between the abutments,
one of the abutments being adapted to press the
element through the die opening when the shank
is moved into the opening and the other abutment
being adapted to pull the element when the shank
is moved reversely, said ring element having a
frusto-conical outer surface converging towards
a shank having means on one end adapted to en
gage the die upon insertion of such end of the
shank into the die opening, a plunger adapted
to enter the aperture and release the lock, and
adjustable means mounting the plunger on the
shank so that the plunger may be variably posi~
tioned radially of the shank.
3. A device for pulling a die element or the
said other abutment and a circumferentially ex~
tending rabbeted portion at the larger end of said
surface to receive said shoulder upon expansion
of the ring element.
7. A device for pulling a die element or the like
out of a holder wherein the element has a die
like out of a holder wherein the element has a
die opening terminating at its inner end in a
substantially radial, outwardly directed shoul
opening terminating at its inner end in a substan
der, comprising a shank adapted to be moved
through the opening, a radially expansible and
contractible ring element on the shank, and abut
ments at each axial end of the element and spaced
a distance greater than the axial length of the
element to allow the latter to slide between the
abutments, one of the abutments being adapted
tially radial, outwardly directed shoulder, com
prising a shank adapted to be moved through the
opening, a radially expansible and contractible
ring element on the shank, and abutmenl‘s at
each axial end of the element and spaced a dis
to press the element through the die opening '
when the shank is moved into the opening and
the other abutment being adapted to pull the
element when the shank is moved reversely, said
element having a frusto-conical inner peripheral
surface for engaging said other abutment so as
to create expansion forces on the element.
4. A device for pulling a die element or the
like out of a holder wherein the element has a die
opening terminating at its inner end in a sub
stantially radial, outwardly directed shoulder,
comprising a shank adapted to be moved through
the opening, a radially expansible and contract
ible ring element on the shank, and abutments at
each axial end of the element and spaced a dis
tance greater than the axial length of the ele
ment to allow the latter to slide between the
abutments, one of the abutments being adapted
to press the element through the die opening
when the shank is moved into the opening and
the other abutment being adapted to pull the
element when the shank is moved reversely, said
element having a frusto-conical inner peripheral
surface and said other abutment having a frusto
conical outer surface for engaging the inner sur
tance greater than the axial length of the element
to allow the latter to slide between the abutments,
one of the abutments being adapted to press the
element through the die opening when the shank
is moved into the opening and the other abutment
being adapted to pull the element when the shank
is moved reversely, said ring element having a
frusto-conical outer surface decreasing in di
ameter towards said other abutment and a frusto
conical inner surface increasing in diameter to
wards said other abutment.
8. A device for pulling a die element or the like
out of a holder wherein the element has a die
opening terminating at its inner end in a substan
tially radial, outwardly directed shoulder, com
prising a shank adapted to be moved through the
opening, a radially expansible and contractible
ring element on the shank, and abutments at each
axial end of the element and spaced a distance
greater than the axial length of the element to
allow the latter to slide between the abutments,
one of the abutments being adapted to press the
element through the die opening when the shank
is moved into the opening and the other abut
ment being adapted to pull the element when the
shank is moved reversely, said ring element hav
ing a frusto-conical outer surface decreasing in
75 diameter towards said other abutment and a
2,413,944
7
frusto-conical inner surface increasing in diame
ter towards said other abutment and the latter
having a frusto-conical outer surface adapted to
engage the inner conical surface of the ring ele
ment.
9. A device for pulling a die element or the like
out of a holder wherein the element has a die
opening which terminates inwardly in a surface
of larger diameter to provide an annular shoulder,
which comprises a shank insertable into the open
ingr and having a circumferentially extending re
cess around the insertable end portion thereof,
and a resilient split ring in said recess which is
contractible to enter the opening and expansible
8
after entering the opening to engage behind the
shoulder, said ring having a frusto-conical inner
peripheral surface increasing in diameter towards
the insertable end of the ring and the recess hav
ing its side wall next to the insertable end of the
shank shaped frusto-conically to substantially ?t
the inner surface of the ring, whereby reverse or
Withdrawing movement of the shank tends to ex
pand the ring, the outer peripheral surface of the
ring being tapered axially towards its insertable
end to facilitate insertion and simultaneous con
traction of the ring.
ALBERT BOLDUC.
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