Note: Descriptions are shown in the official language in which they were submitted.
13~72~1
This invention relates to end closure structure
providing abuse-resistance in combination with
controlled opening of a full-panel convenience--feature
along with raw-edge metal shielding during and
subsequent to opening; and, is concerned with methods
and apparatus for fabrication of such closure structures
in addition to opening methods.
This invention is concerned with providing a
full-panel, convenience-feature end closure made from
steel which can be readily opened while also providing
shielding for raw edge residual scoreline metal to
provide an improved type of protection not previously
available in such full-panel easy-open art. In
addition, this invention is concerned with providing
increased strength for sheet metal easy-open end
closures for protection against abuse during
transportation, warehouse stacking and market handling.
According to one aspect of the present invention
there is provided a sheet metal end-closure structure
for a container comprising an end wall panel
circumscribed by unitary chime seam metal for forming a
chime seam by which the end-closure structure is
attached to a container body and having a continuous
peripheral scoreline defining a severable portion whose
removal provides an opening in the endwall panel to
facilitate full removal of the contents of the
container. The severable portion is provided with an
elongate integral opener. The endwall panel having
shielding means located outboard of and contiguous to
the peripheral scoreline for shielding residual metal at
the torn peripheral scoreline remaining with the
container. The shield means has a stiffening effect on
the endwall panel. A shock-absorbing bead or
corrugation is disposed between a chuck wall and the
shielding means for protecting the peripheral scoreline
from blows or other impact forces applied to the chime
seam, endwall structure or container body.
.
.
2 13~7~
According to another aspect of the present
invention there is provided a full-open, safety-edge,
disc-removal, convenience-feature sheet metal
end-closure structure. The structure includes an end
wall panel circumscribed by unitary chime seam metal for
attaching the end wall closure structure to a container
having a conEiguration which is symmetrical about a
central longitudinal axis of a container with the
central longitudinal axis intersecting the end closure
panel at its geometric center when the end closure is
attached to the container. The en~ wall panel is
recessed axially in relation to the chime seam metal
toward the interior for such a container. A bead, which
is "U" shaped in cross section in a plane which includes
such central longitudinal axis has its closed end
disposed axially inwardly toward the interior. A chuck
wall is symetrically disposed in relation to the
geometric center or one panel and extends in the axial
direction from the chime seam metal towards the
axially-recessed end wall panel with the outboard leg of
the bead forming an extension of the chuck wall. A
peripheral scoreline is spaced inboard of the chuck wall
and "U" shaped bead toward the geometric center of the
end wall panel defining a removable end wall disc for
providing an opening in the end closure structure to
facilitate full removal of container contents. A
multi-layer sheet metal fold i5 located on the interior
surface in relation to the container and circumscribes
the removable end wall disc contiguous to the peripheral
scoreline in a position to shield raw edge residual
metal of peripheral scoreline upon rupture thereof. An
elongate longitudinally-rigid opener is secured by a
unitary rivet to the removable disc contiguous to and in
substantially parallel relationship to such
generally-planar configuration of the ~nd wall panel
with the longitudinal a~is of the elongate opener being
;: r~
2a ~L~11 72a~
oriented toward the peripheral scoreline with the
working end of the elon~ate opener contiguous to the
peripheral scoreline. A multi-layer sheet metal fold is
located outboard of and contiguous to the peripheral
scoreline on the exterior surface of the end wall panel
in relation to the container providing shielding for
raw-edge residual scoreline metal remaining with the
container and also providing a barrier to
outboard-directed movement of the elon~ate opener, with
such multi-layer sheet metal fold being located inboard
of the shock-absorbing bead so as to direct the working
end of the opener toward the recessed panel and the
peripheral scoreline to initiate rupture of a minor
portion of the peripheral scoreline by Class I lever
action. An arch-shaped back scoreline means has a
central portion partially circumscribing and located
inboard of the rivet toward the geometric center of the
end wall panel with a leg extending from the central
portion on each side of the rivet, each such leg having
a major directional component toward the adjacent
portion of the inner shielding multi-layer sheet metal
fold to form a chord of preselectPd length between
intersections with the multi-la~er sheet metal fold on
the end wall disc. The central portion of the back
scoreline means is ruptured by Class II lever action
upon initial movement, about such unitary rivet as a
fulcrum, of the handle end o~ the opener with the handle
end moving in a direction away from the end wall panel
in an arcuate path extending externally of the container
causing rupture along the bac~ scoreline legs with the
intersections with the fold forming a fulcrum axis for
continued arcuate direction movement of the elongate
opener to bring about contact of the opener with the
chime seam metal which acts as a fulcrum for continued
Class I lever action opening which moves at least a
portion of the removable disc in an axial direction
,.,~,
~3~72~
externally away ~rom the container to continue rupture
of the peripherally located scoreline.
According to yet another aspect of the present
invention there is provided a method for fa~ricating an
abuse-resistant, full-panel, convenience feature end
closure structure for a cylindrical sidewall
configuration container from flat-rolled sheet metal so
as to provide shielding for residual raw edge metal
remaining after severing a circular-configuration
peripheral scoreline defining such full-panel opening
for the container. A method includes the steps of
forming chime seam metal around the periphery of a
substantially-planar flat-rolled sheet metal blank for
attaching the end structure to a cylindrical sidewall
container, and countersinking an end wall panel in the
sheet metal blank radially inward of the chime seam
metal and disposed axially toward the interior of the
container from the chime seam metal with the
countersinking step defining a substantially
cylindrical-configuration chuck wall contiguous to and
extending from the chime seam metal in the axial
direction toward the interior of the container, a
peripheral rim of sheet metal contiguous to the chuck
wall and in substantially parallel relationship with the
countersunk end wall panel, and an intermediate
configuration which is stepped in radial cross section
in extending between the peripheral rim and the
countersunk end wall panel. The stepped configuration
includes a plurality of unitary sheet metal portions in
angled relationship to each other with a compound
curvilinear transition zone located at the peripheral
rim, between each pair of angled sheet metal portions,
and at the end wall panel. A bead is ~ormed which is
~'U" shaped in cross section in the peripheral rim, with
the closed end of the "U" shaped b~ad being disposed
toward the interior of the container~ An orientation is
2c ~3~72~1
established which is substantially perpendicularly
transverse to the container central axis for a sheet
metal portion located intermediate other angled sheet
metal portions of the stepped configuration between the
"U" shaped bead and the countersunk end wall panel. The
intermediate sheet metal portion is established for
locating a circular-configuration scoreline therein on
its exterior surface for defining the periphery of a
disc to be removed from the end closure structure, with
the remaining angled sheet metal portions being located
radially inboard and outboard of the intermediate sheet
metal portion. Angled sheet metal portions located
radially on each side of the intermediate sheet metal
portion are oriented so as to be in acute-angled,
overlaying, pre-folded relationship to each other to
provide for a pair of multi-layer folds of sheet metal
with the pre-folding orientation of such multi-la~er
folds of sheet metal being carried out to locate one
each of the pair on opposite sides radially of the
predetermined location for such circular-configuration
peripheral scoreline to be located on such intermediate
sheet metal portion and to locate one each of s~lch pair
; on opposite surfaces of such end wall panel so as to
allow access for a scoring tool on one surface and
access for a backing-support tool for such scoring on
the remaining surface of the intermediate sheet metal
portion. A rivet butkon is pre-formed for use in
securing an opener to the end wall panel during the
pre-foldin~ orientation of the multi-layer folds of
3Q sheet metal. The circular-configuration peripheral
scoreline is formed to substantially uniform depth in
the intermediate sheet metal portion while providing
access between the multi-layer sheet metal folds as
pre-folded for a scoring tool on such exterior surface
and for backing the support tool on the interior surface
of such end wall panel. An arch-shaped back scoreline
~ 3 ~ 7 ~
means is formed having a central portion at least
partially circumscribing the rivet button radially
inwardly thereof, and a leg extends from the central
portion on each side of the rivet button in the
direction of an adjacent portion of the chime seam with
the effective included angle between the direction of
the legs being an acute angle. The method then includes
the step of completing disposition of the angularly
pre-folded sheet metal portions in relation to the
peripheral scoreline such that one each of the
compound curvilinear transition zones define a circular
configuration in plan view which is contiguous on its
respective surface of the end wall panel to the circular
configuration peripheral scoreline.
The above and other contributions are considered in
more detail in describing embodiments of the present
invention shown in the accompanying drawings.
In such drawings:
FIG. 1 is a plan view of the exterior ~public side)
of an end closure structure embodying the invention;
FIG. 2 is a plan view from the interior (content
side) of the Pnd closure of FIG. 1;
FIGS. 3 and 4 are radial cross sectional views of
the end closure structure of FIG. 1 along lines 3-3 and
4-4, respectively;
FIG. 5 is an enlarged view of a portion of the
radial cross sectional view of FIG. 3 at a location
diametrically opposite to the position of an integral
opener for such end closure;
FIG. 6 is an enlarged cross section schematic view
of a portion of an end wall panel for purposes of
describing interrelated placement of portions of an end
closure structure for operation of the working end
~3~72~
oE an integral opener as taught by the lnvention;
FIGSo 7-12 are cross-sectional views of tooling
and end closure structure for purposes of describing
sequential fabrication steps, in which:
FIG~ 7 shows results of a blank forming stags,
F~G. 8 shows initial configuration ~ormation o~ a
shallow depth rivet button and a peripheral shock-
absorbing bead,
PIG~ 9 shows eurther ~orming o~ the rivet button
and initiation of pre-~olding o~ an inner multi-layer
sheet metal ~old eor shielding residual torn metal
remaining w.ith a removable panel portion,
FIG. 10 shows scoring of the end wall panel and
initiation o pre-folding of an out-r multi-layer
sheet metal old for shielding residual torn metal
remaining witll the container,
FIG. 11 shows~ com~letion of such multi-layer
sheet metal folds and Eorming pro~iling in a panel
portion, and
FIG. 12 shows completing ~ormation of the rivet
securing an opener to the end wall panel; and
-- ~ FIGS. 13 throu~h 17 are perspective views oE the
__ ~
end closure embodiment of FIG. 1 and a portion Oe a
container for descri`~ing the opening procedure taught
by the present invention.
In any of the known prior art "disc pull-out"
~3~72l~,
ends, only a minor portion of the peripheral scoreline
was ruptured by lever action. Such rupturing took
place initially when the opener was lifted. There-
after, the remainder of the peripheral scoreline was
separated by pulling backwardly on the ring-pull oE
the opener. In general, such previously available
disc pull-out ends were Eorced to rely on folding the
removable disc over (onto itself) so that the residual
metal along the remainder of the peripheral scoreline
could be "torn," as the opener was pulled backwardly-
diametrically across the center of the end wall after
the initial rupture.
In general, most such ~ull-pane1 easy-open ends
have used "lanced" openers in which the handle end of
the opener was Eree to be lifted away Erom the panel
while a riveted portion of the opener remained
coplanar with the panel as riveted. However, when a
"vent scoreline" was use~ in certain prior "disc pull-
out" end closures, a lon~itudinally-rigid (Lance-frae)
opener was used to rupture the vent portion of the
back scoreline and provide for movement of the ring-
pull opener from a radially-recessed position which
was required for chuck tooling access for chime seam
formation.
Features of the present invention maintain the
removable disc substantially planar and rigid through-
~L3~72~
out the opening procedure Eor the container. ~lso,
the substantially rigid end wall panel provided
contributes to the continuing lever-action opening
features made available by the invention. And, an
accurate interrelated positioning of parts ~acilitates
ease o~f initial rupture of the high-strength abuse-
resistant ends provided.
In the circular-configuration embodiment o~ FIGS.
1-5, end closure structure 27, shown in plan view o~
its exterior (public side) in FIG. 1, and in plan view
of its interior (content side) in FIG. 2, is ~ormed
with chime seam metal 2~ around its circular periphe-
ry. A longitudinally-rigid (non-lanced) opener 30
(FIG. 1) is secured to removable disc 31 ~y rivet 32.
The working end 33 of the elongated integral opener 30
is positioned in contiguous relationship to a portion
o~ peripheral scoreline 34; the latter, as shown and
generally preEerable, has a circular configuration in
plan view and de~ines the removahle disc 31 portion of
the recessed end wall panel o~ closure structure 27.
The cross section views o~ FrGS. 3 and ~ are
taken along the ull diameter of FIG. l; FIG. 5 is an
enlarged cross sectional view o~ a portion o~ FIG. 3
diametrically opposite to the location o~ the working
25end 33 of opener 30.~ PeripheraL scoreline 3~ is
: spaced radially inwardly from chuck wall 35 toward the
.
.
13~1 ~2~
central longitudinal axis for a container shown in later
figures; such axis passes through the geometric center
of the removable disc 31 and end closure struckure 27.
A curvilinear vent scorelina portion 36 (FIG. 2) of
the back scoreline means partially circumscribes rivet
32. Such back scoreline means continues along legs 37,
38; with one each extending on opposite sides of the
rivet with each having a major component of direction
which is radialO As taught herein, the back scoreline
means is arch-shaped in configuration as shown in the
embodiment of FIG. 2 and later figures; the arch-shape
provides an added safety feature improvement over the
moustache shaped back scoreline configuration previously
provided and described in Canadian Patent Application
Serial No. 578,885, filed September 29, 1988.
In a preferred embodiment of the present invention,
a multi-layer fold of sheet metal i5 positioned on each
cross-sectional side of peripheral scoreline 34 (FIG.
5). Each such multi-layer sheet-metal fold acts to
shield the raw edge residual metal remaining after
severing along a peripheral scoraline. A triple-layer
fold of sheet metal, as described in more detail later
herein, is adequate and is preferred to accomplish such
purposes.
- r ~
~7~
Tripl~-layer metal fold 40 (FIG. ~) remains with
the severable portion 31 ~disc shaped in ~he embodi-
~ment o~ FIGS. 1-5) upon and aeter severing along a
paripheral scoreline 34. Triple-layer fold 4~, wh.ich
is positioned outwardly of the scoreline 34, and in
accordance with a preferred embodiment of the inven-
tion on the extarior sur~ace (public side) o~ the end
closure structure 27, remains with that portion of the
end closure structure remaining wi~ the container
upon and a~ter severing o~ scoreline 3~.
The configuration and pLacement o~ the arch-
shaped back score.~ine means (as seen in ~I~. 2 and
later figures), along wit~ othe~ ~arts o~ the end
closure structure, pla~f important roles in the
interaction of UnitAry and integral portions ~hich
facilitate ease o~ opening. Tearing along leg portions
37, 38 of the back scoreLine means, after rupture o~
the curvilinear vent portion 36 would ordinarily cause
lance-free opener 30 to move out~ardly ~ith a
radially directed component o~ movement in the
circular embodiment o~ FIGS. 1-5). Part oE the
invention teaches positioning a Eormed, unitary
portion of end ~all ~etal to accurately contr~ol (by
stopping~ such movement o~ the opener and to direct
the opening force o~ its working end 33 toward a
location, ~ithin p~escrlbed limits, whlch facilitates
13~72~
initial rupture o the peripheral scoreline 34.
Positioning of the rounded-edge transition zone
44 of multi-layer fold 42 (FIG. 6 enlargement
controls any movement of the opener 30 and directs the
opening Eorce of its working end 33 toward the
peripheral scoreline 34.
The rounded transition zone metal 43 o~ the
~ulti-layer ~old 40 is positioned oppositely but
contiguous to the location of the peripheral scoreline
34. In a circular embo~i~ent, rounded transi~ion zone
metal 43 has a predetermined diameter (~easured in the
plane of the end wall) ~hich approximates, but is le~ss
than, the diameter of the rounded-edge transition zone
: metal 44~ of multi-layer sheet-metal fold ~2. The apex
:l5 of scoreline 34 (at ~which rupture occurs) can also
approximate, but is less than the circumference of
; transition zone metal 14. These teachings avoid
attempting to remove an end wall disc ha~ing a greater
circumference than that of the ~etal at zone 44.
Rounded metal 43 is positioned to shield the raw-
edge residual metal re~aining with disc 31 b~ at least
partially obstructing access of such torn ed~e metal.
The torn portion Oe the peripheral scoreline 34 (at
the apex o~ thë ;'V" snaped radial cross-sectional
~ 25 configuration::of the scoreline) has a diameter which
: can be appro.Yimately equal to that of rounded edge
-
13~72~1
metal 43 of the transition zone Eor multi-layer ~old
40 but, as pointed out immediately above, must be less
than that o~ rounded edge metal 44 Oe the outer
barrler-means multi-layer sheet metal fold 43;
otherwise, edge 44 would block removal of a disc which
presented metal Oe larger diameter.
There is a range ~or application of an Initial
rupturing force which, to facilitate ease of opening,
particularly in opening a steel end closure, is
measured in thousandtlls o~ an inch for typical
consumer-size cans, such as a three-inch liameter can.
This ranqe takes into account an arcuate path movement
for the working end of the opener and, the "v" shaped
conf~iguration, in cros~s section, o~ the peripheral
:
scoreline. Controlling movement o~ the int~egral
opener so as to guide its working end 33 to contact
the end wall panel witllin an acceptable range, as
taught herein, is carried out by positioning the
multi-layer fold 42 so as to act as a barrier in which
edge 44 stops radial movement o~ opener 30 and dir~ct
its working end 33 inwardly (in relation to a con-
~` tainer) toward such peripheral scoreline 3~ in the
recessed end w~all panel.
.
The scoreline ~34 has a diameter (where rup~ture
occurs) which approximates or is sli~htly ~reater than
~ that of the transition zone metal 43 of multi-Iayer
:
,
'13~12~
folds 40. The open end of "V" shaped (in cross
section) scoreline 34 is between about five and about
ten thousandths of an inch in radial dimension. For
example, scorin~ .006" deep with a scoring tool having
a 50 included angle results in the open end of the
"V" having a radial dimension of .0056"; and, scoring
.009" deep with a scoring tool havin~ a 60D included
angle results in an open end having a radial dimension
of .0104". The working end of the opener is turned
inwardly toward the recessed end wall pan~l by
preventing radial movement o~ such working tip of the
opener in the plane o~, or parallel to the plane oE,
the end wall panel. The location o~ the barrier .
means, multi-layer ~old 42 is se.~ected to take into
account the angled move~ent o~ the working end 33
toward scoreline 34.
ay stopping the horizontal ~radial) component o~
movement, the lever-action opening force is thus
directed vertically downwardly toward the scoreline
34. In accordance with present teachings, the radial
distance between rounded edge 43 (approximatelv the
same location as center of scoreline 34) and the
barrier location o.f rounded edge 44 can be in a ran~e
between about eive and about twenty thousandths of an
: 25 inch Eor an end wall closure structure Eor a three
(300) to a three and seven-sixteenths (307) inch
13~72~
11
diameter container in which the end wall comprises
flat rolled steel of about .008" to .010" nominal
thickness gage. By preventing radial movement of the
opener beyond such range, its working end will be
turned, ~oward the end wall pansl into, or sufficient-
ly adjacent to, the open end of the peripheral score-
line to facilitate ease of opening.
Positioning the barrier-means edge metal 44
beyond the earlier designated range (closer to shock-
1~ absorbing bead 45 which i.s contiguous to chuck wall35, FIG. 5) will diminish the ease o~ opening, if not
make opening substantially impossihle eor a consu~er
of average strength.
Along ~tith such interrelated positionln~J of
parts, the new combination of steps tau~ht provides in
combination abuse resistance, controlled ~nove~ent of
the opener and shielding o~ raw edge metal features
while still providing access and timing, during
sequential fabrication stsps, ~or eeeicient and
efEective peripheral scoreljne and rivet button
formation.
In FIG. 7, the sheet metal is blanked and an end
panel 49, inboard of chuck wall 35, lS countersunk in
relation to chime metal ~. A peripheral rim 50 is
for~.ed contiguous to chuck wall 35 ~or subsequent
e~r~ation of sb~c~-abso~ber bea1 45 (as sllown in FIG.
,
IL f3 1. 7 2 ~
5, the outboard leg oE such "U" shaped bead is an
extension of chuclc wall 35). From rim 50 a series of
sheet metal portions, riser 51, step 52 and riser 53,
extand in stepped fashion to recessed panel 49 which
has an extended-planar-surface area.
Such riser and step sheet metal portions are
joined by transition zones 54, 55, 56 which are of
compound-curvature in a circular configuration
embodiment with each being curvilinear in radlal cross
section and also around its respective circumference
in a plane which is perpendicularly transverse to the
central longitudinal axis ~or a container to which the
end closure structure is at~ached. Such steps and
risers, along with the transition zones participate in
formation of the double ~ulti-layer sheet ~etal Eol~s
40, 42 ormed during the sequences of FIGS. ~-12. ~im
50 l~ads through zone 54 to riser Sl, which leads
through zone 55 to step 52. The latter lead.s through
zone 56 to riser 53 which leads through zone 57 ~o
portion 58 of the recessed end wall panel.
In carryin~ out the procedures of FIG5. 8-12, the
timing of the shock-absorbing bead formation, rivet-
button formation, the multi-layer folding action, and
the extent to which multl-layer sheet ~etal pre-Eold-
ing is carried out prior to ~ormation oE the periph-
eral scoreline 34, are important considerations along
, .
~3~72~
~ith the timing o end wall pro~iling ~ormation in
relation to securing an integral opener.
The peripheral scoreline 34 ~or the removable
disc 31 is to be disposed in the end wall panel 49
intermediate the pair o~ multi-layer folds (FIGS. 5,
6) each of which separately shield residual scoreline
~etal on the separated disc and on the container. The
~orming sequence procedure taught enables tooling
access, between the ~ulti-layer pre-folds on each
surface of the end closure, to enable scoring of a
; single thickness o~ sheet ~etal while th~ latter is
supported on the remaining sur~ace opposi~e to tha
scoring tool. The ~orminy o~ the shock absorbing
bead, pre-folding o~ the sheet metal layers and
preforming tl1e rivet hutton prior to scoring, enables
completing the ~o~ding action, around such periphery,
with minimized move~ant oE sheet matal ~olds being
required after such scoring so as to sub.stantially
pr~clude premature damage to residual scoreline met~l.
In the operation o FIG. 8, an initial rivet
button configuration 60, ha-~ing a broad-diameter
shallow-dome shape in cross section, is ormed. ~lso,
the sheet metal o~peripheral rim 50 is pre formed
into shock-absorber bead 45. St.~p portion 52 is
oriented horizontally as shown. Perlpheral scorin~
(34) will subsequent~ly take place on such horizontally
:
'
~3~2~1
14
oriented metal portion 52 of the end wall panel 49.
Such horizontally-orient~d metal portion 52 is to be
- located so as to interconnect the pair of multi-layer
folds 40, 42.
Shock-absorbing bead ~ormation, the stages of
multi-lay.3r ~olding o~ the sheet metal, scoreline
formation, the stages o~ rivet button formation,
pro~iling, riveting an opener to the removable panel
port.ion, and embossing opening instructions are
coordinatsd while optimizing the number of sequential
steps. In addition to the above enumerated advantages
o~ scorin~ a single Layer ol m~tal and avoiding
premature damage to residual scorelinc metal, the
rivet button formation and riveting actions are
lS carried out without inter~ering ~lit!- the metal 'olding
or scoring operations. Embossin~ openin~ instructions
can be carried out simultaneous1~f ~ith ~ormation of
the rivet button and the pro~iling including recessed
einger access, as described later herQill.
2~ The shock-absorbing bead (45) as initially pre-
formed (FIG. 8) is loosely de~ined. ~lso, start o~
the move~ent o~ metal, including transitiQn zone 54
and a portion o~ riser 51, which will comprise a part
o~ the outer multi-layer ~old, is taking place.
In FIG. ~, a smaller-diameter, greater-depth
rivet button 62 is formed an-l the pre-~o1ding Q~ metal
I 31 72~
portions ~or the inner multi-layer ~old (40), that is
riser portion 53 and a portion 58 of the end wall
panel 49 contiguous to transition zone metal 57, are
initiated.
In F~G. 10, the sheet m0tal portion 54 o~ FIG. 9,
along ,with a portion of riser 51 are ~oved so as to
partially ~or~ the outboard multi-layer sheet metal
fold (42) while leaving access for scoring tool 64 to
~orm peripheral scoreline 34 in ~he ex~erior (public)
surface ~o~ the end wall panel ~9 (thus de~ining the
removable portion 31): while on the interior (content)
sur~ace of the end closure baclc-up tool 65 has access
pa~st the inboard multi-layer fold (40) whlch is being
formed.
In FIG. 11, the peripherally-locatad shock-
.
absorbing bead 45 is better dafined in a portion o~
peripheral rim 50 by tool 66; and the outboard multi-
layer fold is bettar shaped by tool 67 which tool
.
helps to deine the location o~ the radially-inwardly
oriented transition zone metal (44 o~ ~IG. 6). Tool
68 also helps to locate such transition zone 44 while
tool 70 helps to position transition zone 43 (of fold
40 in~FIG. G)~ as the~multl-~layer ~olds are being
formed in ~inal orientation. The shape of the rivet
button 62~is~held by the tooling shown; and end wall
panel p~ g is be:ng carrled out.
-,
~3~72~1
16
In FIG. 12, while maintaining the shock-absorbing
bead 45 and protecting sheet metal folds 40, 4~, the
rivet button of FIG. ll, after receiving opener 3n ~ is
~ormed into rivet 32.
The registration and stacking protrusions 70, 72
(FIG.~l) are ~ormed in the initial blantcing stage.
The profile risers 76, 78 and fin~er indentation 80,
to improve finger access beneath handle end 82 of
opener 30, are formed in a subsequen~ sequence, prior
to placement o~ the opener 30 for riveting, along with
embossing o~ opening instructions ~4.
Pro~ile risers 76, 78 serve the uncti.on o
holding the non-lanced opeller 30 substantially
parallel to the generally planar conEi~uration o~ the
end wall pane.l 49 for riveting. Such risers and the
Eingsr indentation ~0 are Eorlned in the centra11y
located recessed pro~iLe 74 o~ the end wall panel ~9.
~ ack scoreline formation pre~rably takcs place
during formation o~ peripheral scoreline 34. The
arcll-shaped baclc scoreline configuration of FIG. ~
which provides a chord o~ about ~.05" len~th h~twcen
legs 37, 38 is preferred. This pre-s~lected chord
length and the arch-shape segment dsfined by the back
: scoreline prevents any raw edge portion Oe the .segment
froln extending over the side o~ the chime seam, thus
preventing a hazard to saE~tyO The pre-selected half-
... . .
~3~7~
17
inch chord length is also the approximate width of
opener 30 at that location.
.~s referred to brie~ly earlier, upon initial
lifting of the handle end o~ opener 30 (FIG. 13) in an
arcuate direction extarnally away from tlle end
closure, the vent portion 36 of tlle back scoreline
ruptures relying on Class II lever action. I~ith
continuing arcuate movement, the back scoreline ~egs
37, 38 rupture toward the adjacent in~ner multi-layer
sheet metal fold 40. The opener 30, with an
endwall portion partially deEined by the back score-
line, pivots about the chord deined by the intersec-
tion's back scoreiine legs 37, 3~ at l3~ and 90 (FIG.
15).
The arcuate direction Inovem-3nt o the handle ~nd
of the opener 30 is continue~ in ths same iirectio~n
with the opener initially contactin~ (FIG. l-~.) chims
92 (formed from chime metal 2i3 and sidewall metal of
container 94) which then acts as the ~ulcrum Eor Class
I lever action opening, as the opener is swung o~er
the 5ide o~ container 94 (FIG. 15).
.~s indicated~ by FIG. lo, this "over the side"
arcuate movement ~continues rupture oE a sl~niElcant
rnajor portion of peripheral scoreline 34 ;7y Class l
lever action a~out chime 92 as Eulcrum. It shoul~ be
note~ in ~relat~on to FIG. 16, that none of the
.
.
131 ~ 2 l~ ~
18
segments of the disc defined by the arch-shaped
scoreline extends over the side of the container, as
occurred with corner portions o~ such segment when
formed from a moustache-shaped scoreline as previously
provided. This arch-shaped scoreline has a prese-
lected chord length as shown (between 88, 90) which is
no greater than the widtll o~ the opener a~ such
location overlying such chord; such preselected chord
leng~h (about 0.50") can be maintained for difEering
sized containers~
After such peripheral scoreline rupture, the
removable disc is Lifted ~rom container 9~ as shown in
~ ~ FIG. 17.
In a typicaL end closure structure ~or a three
15 and 7/16 inch diamet~r ~307) can bod~ side wall ~ade
~rom flat rolled steel (75 '~/66, about .008" nominal
thickness gage) ~etal plated and coatcd with a
standard or~anic coatiny, the followiny data are
representative:
~3~72~
19
Item Diameter
Chime metal 28 (C.L.) 3.50"
; Chuck Wall 35 3.25"
: Bead 45 (~.L.) 3.22"
Transition zone 44 (ref.) 3.078"
Scoreline 34 (C.L.) 3.068"
~: Transition zone 43 (ref.) 3.064"
Rivet 32 (C.L.) 2.443
Other representative dimensions:
Item Dimensions
Bead 45 (depth) .035"
(~idth) .050"
Chime metal 28
: (Cent*r Heigtlt above
bottom of bead ~5) .150"
Rivet 32 ~ -
(head diameter) .250"
(body diameter) .l~6"
Chord length
(between legs 37, 38 at
: : intersections 88, 90) 0.50"
Profiling panel 74
(dia~eter) ~.
Axial dimension between
center of chime seam
metal 2~ and panel ~9
~ (FIG. 7)
: ~ Typical thicknesses for flat rolled aluminum ond
closures would be'.00g" to .012"~with residual metal
thickness For ~scored severin~ .lines of about .004" to
; .005"-
;:
.
, ' ' : , -
1 3 ~
While specific values, materials, and configura-
tions have been shown for purposes Oe speci~ically
; describing an embodiment of the invention, other
values will be available in the light Oe the above
teachings; therefore, for purposes o~ d~termining the
scope of the presen~ invention reference should be
made to the appended claims.
