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Dec. 31, 1946.
1__ w, sTURDY
2,413,591
APPARATUS FOR FORMING CAN TOPS AND LID‘S
Filed April 7, 1944
2 Sheets-Sheet l
'j'nve‘nTor
6; L150. .SiurcYy
Dec. 31, 1946.
2,413,591
L. W. STURDY
APPARATUS FOR FORMING CAN TOPS AND LIDS
2 Sheets-Sheet 2
Filed April 7. ‘1944
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2,413,591
lfateated Dec; 31, 1945
[OFFICE
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Application April 1. 1944,
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40lalms.
(cans-.42)
Myinvention aI‘
in particular a‘ the
a ring‘ anda
méinuiacture of a can top having
- The ordinary can oncontainer or the detach
able closure type-hasa-topiormed by airing
whichseats thelidr
g
No. 52am 1 i
.
.
“
"
'
Q Fig. v1 is a central sectionalview of the punch.
2is a central sectional view of the die used
in conjunction with the punch.
' . Fig. 3 is a sectionalview of the inverted ring
and the lid formedby the punch‘ and die.
I Fig. ; is a central section of the punch and
I
first ‘step of cutting the ring
~ _dieH showing the.
Previous to my invention, so turns 1 am aware,
and lid blanks from the stock in the descent of
it was the usual practice‘ to form the ring-like
the punch.
'
h
top bya punch and die in a press and to use
Fig. 5 is a similarviewto Fig. 4, but shows the
a separate punch and die for forming the lid. 10 next step ‘of forming the blanks into the ring and
The central piercing. from the ring was discarded _
as a slug, and a common manner of disposing
of this slug wasrtovpush it upwardly out of 'the
die, or toy force it downwardly therethrough. ,
the lid.
_
,
,
I
V Fig. 6 is a fragmentary perspective view of the
ring. and Fig. 7 is aysimilar view of the lid.
Like numerals of reference‘ indicate similar
. V'The paramountiobject' of, my invention is (to 15 parts throughout the drawings of the invention.
provide a punch anddie for, forming a canring .
In the can industry it is common to make cans
and lid in a single operation, the lid being adapted
for a can voi! a smaller size than that for which
and the like with closures that are secured by
a‘ friction iit between the closure itself and the
top or theacan. Such a top usually has a down
.‘A further object is toprovide a. combination 20 turned flange l0 forming a mouth‘ receptive to
theringismade,
>
4
punch and die which will produce a'ring and lid
of'the nature "specified in a single press operation
in which the central piercing of the ring is con
‘verted into the lid inorder to utilize this slug
and thus ei‘iectasubstantial saving in material
the closure. Before the top is applied to the cyl
indrical body of the can‘ it is common to provide
it with anannular loop or channel H, from which
extends an attachment ?ange ‘l2, as will be well
and cost of manufacture.
ring, and the closure is a‘ lid which commonly has
,
A still further object is to produce a punch and
die which will form thevring and the lid entirely
automatically and in a manner to substantially
understood in the a
. g The top constitutes a
a central depression ll for?tting into the mouth
of the top, and a radial ?ange It. It is not an
30 object of my invention to change the form of the
eliminate all hazard to the punch. and die.
ring and the 11 ,but to provide a combination
A distinctive feature of the invention is that
punch and die,., which in one stroke of a press
my method of manufacture produces the two
will form a top for a can of a certain size and a
parts for cans in one operation on an ordinary
lid tor a can of asmaller size, using the disc that
press in charge of a single operator. The sheet
is cut from the centre of the top. Such a top
metal stock from which the two parts are simul 35 and lid are illustrated in Figs. 3, 6 and 'l, and
taneously madeis of the same size as customarily
shown inverted as this is the‘position in which
‘required for a ring.
they are formed by the punch and die. A stand
A distinctive feature of the punch“ and die is
ard press is vused preferably having its operat
that they have inner and outer cutting edges for
40 ing axis inclined about forty-five degrees to the
and
intervening
forming
sur
blanking the ring
faces which draw the blankinwardly from said
vertical.
\
‘
~
_
The punch, generally denoted at I5, is fitted in
cutting surfaces so that the formed ring may be
the crosshead of the press as by means of the
readily pushedupwardly out of the die for ejection
element II, and the die is mountedupon the bed
from‘ the press. Additionally‘ there is provided 45 by'means of a bolster II. The punch comprises
suitable forming. surfaces centrally of the said
the external cutting edge It and the internal cut
inner cutting edges of the punch and die, which
ting edge It. the outer annular forming ring 10,
form the central piercing into the lid and reduce
-the inner annular forming ring 1!, and the
its diameter withthe result that it likewise can
knock-out member 22.
be readily pushed upwardly out of the die for 50 The die comprises the cutting edges 23 and 24
which correspond respectively to the cutting
election from the‘ press.
_
‘
In actualpractice my invention has been found
edges i8 and ‘I9 aforesaid. The die also includes
to be highly‘ practical andeoonomical in the man
the outer annular forming ring 25, the central
forming plug 20 and the knock-out rings 21
ufacture of rings. andlids of cans.
The selected embodiment of the invention is 55
illustrated in vthe accompanying drawings, in
The knock-out member I! of the punch is
and“.
which:
-
‘
.
--
'
2,418,591
‘backed by a spring 20 and guided by the element
to in its receding movement. The knock-out
members H and it are separately backed by
= springs 3i and 32, and shouldered in well-known
manner to limit their upward movements.
In the working stroke of the press,. the ?rst
' step of the operation. Fig. 4, consists in cutting
vfrom the sheet stock 33. by means ofthe cutting
edges i8, i0, 23 and 24, the blanks from which
movement inwardly of the material, means for
cutting out a disc from said blank; including a
forming ring in the die having an inner annu
lar cutting edge, means for clamping the rim
of said disc. and means for fcrniing'a ?ange on
said disc characterized in that it includes a
central cylindrical forming member in the die,
having a peripheral drawing shoulder of ‘a less
diameter than said cutting edge which provides
the top A and the lid B are to be formed.- The 10 ‘a space receptive to an annular member on the
periphery l2 0! the blank for thetop A is clamped - punch having an inner drawing shoulder for
snugly between the annulus 20 and the knock’
out ring 21 with su?lcient’ pressure to {prevent it
from wrinkling, but not to prevent its being
drawn inwardly in the ensuing forming opera
tion, Fig. 5. As this blank is forced downwardly
onto the forming ring 25 its medial portion is
?rmly gripped between a shoulder portion 34 on
the member 25 and a recess 85 in the face of
co-acting with said drawing shmilder to v?ange
the disc, said space, containing a clamping ring
operative to elect the disc-upwardly from the
die in the return stroke of the press.
>
4
2. A punch and die for forming sheet mate
rial into a can ring and a lid, the punch com
prising an outer annular cutting ring, an inner
annular forming ring-spaced therefrom, and a
member 2b, which shoulder portion 84 and recess 20 central yieldable knock-cutnmemberhaving a
36 co-act to form the loop ii, and in so doing
clamping face, the‘ outer edge-ofssaid outer ring
draw in the external diameter of the blank and .
having a cutting edge-andithe inner edge there
also the internal diameter thereof, which assures
of having a shoulder formed by anadiacent re
of its being free of themcutting- edges of the die
cess- in the-lower surface and spaced from saidv
in its ?nal form. coincidentally with the form
cutting. edge, the outer ‘edge of said inner ring
ing of said loop the ?ange I2 is formed, and the
having a cutting edge and
hav
inner edge portion of the blank is turned up by
ing
a
drawing
edge,
said
die
comprising-mower
its being forced downwardly over a shoulder I6
annular cutting ring,‘ ' an innerannular jiorming
by the inner edge 31 of the forming ring 2. which
spaced therefrom, a-centra'l'mem
is spaced from the forming ring 24 to clear the 30 ring
ber spaced from the innerring; 'andl'yieldable
shoulder . at. The‘ bending of this inner edge
knock-out rings in the spaces provided between
portion forms the ?ange N at the mouth of the
the outer ring and’the
between
top. It will now be understood that the top A
the inner ring and the central member, the
is completely formed in thesecond step by means
inner edge of the outer ring having-a cutting
of the forming surfaces referred to, as the punch 35 edge co-acting with the cutting edge on. the
descends further with respect to the first stepv
outer ring of the punch, the inner edge of the
of cutting the blanks. '
inner ring having a cutting edge co-acting with
During the second step, the periphery of the
the cutting edge‘on the inner ring‘ of the punch
blank for the lid B is clamped between the an
and that ring having a shoulder'at its outer edge
nular forming member 2i and the knock-out 40 formed byan adjacent recess-to co-act with the
ring 28, and forced downwardly over the central
shoulder and recess on the outer ring 'of the
forming member 28 to form the ?ange II. The
punch to provide a loop and a ?ange on the
drawing of this ?ange reduces the diameter of
can
ring cut from the material, the central
this blank with the result that it is clear of the
forming member having an- outer shoulder over
cutting edge 24 of the die and may be ejected 45 which the disc cut from the can ring is drawn
without any tendency to stick in the die and
by the drawing edge of the inner ring on the
damage the same.
_
'
punch to form a lid. ,
‘The top A and the lid B are ejected by the
3. A punch anddieas defined in claim 2.
knock-out devices 27 and 28 in the inverted dis
in which in the drawing of the disc the central
position/in which each is formed. There is no 50 portion thereof is clamped by the knock-out
waste of. material and the formed parts are free
member in the punch, and in ‘which the edge
to drop freely from the press when ejected from
portion of the disc is'clamped by the knock
the die. There is obviously a considerable saving
out member located between the inner ring and
both-in time and labour in producing the two
the central member of the die.
articles in a single operation.
55
4. A punch and die of the class described com
Whereas the invention has been described and
prising means for cutting a blank from suitable
illustrated as applicable for the production of a
stock and for performing forming and cutting
single ring in conjunctionnwith a lid, it will be
operations thereon inside its rim portion while
manifest that?it could be used for the manufac
said rim portion is yieldably clamped to retard
ture of a multiple of rings and a lid at the same
the movement inwardly of the material, said.
time by duplication of the ring-making parts on ~ means
including a forming ring in the die hav
the punch and die.
._ v ‘
.
ing an inner annular cutting edge, the im
Having discios the selected form of the in
provement including a ring in the punch in
vention it will b manifest that such changes
wardly of said ring having any outer annular
and variations may be resorted to as come within 65 cutting edge for co-acti-ng with said cutting edge
the spirit and scope of the appended claims.
thereof to sever a disc from the blank and hav
I claim:
ing an inner drawing shoulder, a central form
1. A punch and die for forming in one op
ing member in the die having a peripheral form
eration a top for a can. and a lid for another can
ing shoulder of a less diameter than said cut
of a di?erent size, comprising means for cut 70 ting edge of the ?rst mentioned forming ring
ting a blank from suitable stock, means for
_ and which co-acts with said inner drawing shoul
clamping the rim of said blank,- means for form
der, and a clamping ring in said space operative
ing an annular loop in said blank inside of said
to upwardly eject said disc.
I
rim and an annular dance on said blank inside
'
LEONARD
W.
STURDY.
oi’ said loop as said clamping means retards the 75
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