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'
Oct. 1,1946.
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|__ L, LAUVE '
‘
2,408,465
CONTAINER CAP » '
Filed May i, 1942
2 Sheets-Sheet 1
0a. 1, 1946.
.L. L. LAUVE ' I
2,408,465 '
‘CONTAINER CAP
Filed May 1, 1942
2 Sheets-Sheet 2
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LguisL.Lauv,e,
.; a
i ,4
2,408,465
Patented Oct. 1, 1946
UNITED STATES PATENT orFicE
.QQNTAINER CAP
Louis L. Lauve, Baltimore, Md., assignor to
‘Crown Cork & Seal Company, Inc., Baltimore,
Md., a corporation of New York
I
I
Application May 1, 1942, Serial No. 441,357
4 Claims.
(Cl. 215—38)
This invention relates to container caps of the
type designed for snap-on and pry-o? 'coaction
with a peripheral locking ring of a container, and
is an improvement on the closure of. Such type
disclosed in Patent N0. 2,109,805, granted, March
1, 1938, to Robert J. Stewart.
The said patent discloses, in particular, a
skirted metal cap having six equi-distantly spaced
iii-pressed lugs in the skirt, the internal diameter
of the skirt being sufficiently greater than the
maximum diameter of the container locking ring
or bead so that upon application or removal of '
the cap the skirt portions intermediate the lugs
2
radial component at the lugs, with the cap ap
plied, may be such that the top of the cap there
above will be distorted upwardly, thereby impair
ing the seal between the cap and the container
lip just .above the lugs._
'
I have discovered that a cap which will afford
an effective seal and willyet have satisfactory
removal characteristics, results when its skirt is
provided with a small number of twin lug forma
tions or dents, the lugs preferably starting in, a
curled edge of the skirt, running at a rather wide
angle into the skirt above the curled edge, and
being shaped for point contact with the locking
ring when applied. The lug-s of each twin lug
can flex temporarily inwardly,
e.., straighten
somewhat, whereby the skirt portions at the lugs 15 formation are preferably spaced as closely as
possible with respect to each other without sub
are enabled to flex outwardly to release the lugs
jecting the skirt to destructive bending stresses in
without ole-formation‘, thereof. A cap which is
manufacture. By the provision of these twin lug
re-usable many times with substantially original
formations, each formation providing; a double
locking efliciency is thus provided.
7
While the eap of the Stewart patent is entirely 2.0 point contact with the locking ring, a'cap having
three such formations will, of course, have the
satisfactory in use so far as sealing efficiency is
concerned, the considerable number of lugs (six)
same number of gripping points as a cap having
renders the cap rather dif?clllt to remove,v par
ticularly when the lugs are formed in the curled
angular extent of the free arcs between two adja
lower edge of the skirt. One, reason for this is
that when the pry-oil tool is applied atany point
six equi-distantly spaced lugs. However, the
cent lug formations is substantially greater than
that between adjacent lugs of- a six lug cap whose
lugs are equidistantly- spaced, and these longer
arcs can more readily flex toward the locking
immediately adjacent the point of leverage appli
ring in cap removal or application. As compared
cation tend to be drawn under the locking ring
of the container and so resist the tilting‘off of the 30 to a cap having three equi-distantly spaced single
under the cap edge and leverage is exerted, lugs
lugs, the lugs of the twin lug formations may be
merged into the skirt at a wider angle for the
facilitation of cap removal.
moval and avoid lug deformation, the outward
In the accompanying drawings, I have shown
component of the force exerted on the cap by the I
pry-on tool results in a stretching effect toward 35 two variants of the invention by way of example
and the description will proceed with reference
the tool which resists outward ?exing of the skirt
Y to these ‘drawings in which:
portion, thus opposing the outward camming of
Figure 1 shows in elevation a cap in accordance
the skirt portion by the lugs which are adjacent
with the invention, the cap being shown as applied
the tool.
'
to the neck portion of a container which appears
It is stated in the patent that as few as three
also in elevation.
lugs may be used, and while this is so in many
Figure 2 is a bottom plan view of the cap of
situations, a three lug cap may fail where high
Figure l,
internal pressures are encountered. Further, as
Figure 3 is an enlarged fragmental section on
to the six lug cap, it might be supposed that case
line‘ 343 of Figure 2, the section including the
of removal would be facilitated by easing the top
adjacent portion of a container.
angle of the lugs somewhat into the skirt there
Figure 4 is an enlarged fragmental section on
above, as compared tothe rather abrupt top angle
line li—ll of Figure 2 and adjacent container
disclosed in the patent. This, however, does not
cap, That is to say, while the skirt portions at
the lugs should ?ex outwardly to facilitate re
overcome the above described tendency for the
portion.
'
lugs adjacent the point of leverage ‘application to 50 Figure 5 shows the parts on the section line of
pull under the locking ring in resistance to the ' Figure 4, but in a different relationship.
outward eammihg action enforced by the move
Figure 6 is an enlarged outside fragment of the
cap of Figure 1 in elevation.
ment of the lugs upwardly‘ across the locking ring.
Figure‘? is an, enlarged ‘inside fragment of the
For another thing, if the tops of the lugs are run.
upwardly into the skirt at too wide an angle, the 55 cap in Figure l in elevation.
2,408,465
3
4
Figure 8 is a view like that of Figure 4 showing
a slightly modi?ed form of lug.
pear in Figure 2, adjacent ends of the curves of
Figure 9 is a bottom plan view of a cap in
accordance with the invention with lug forma
tions of modi?ed design.
Figure 10 is an enlarged fragmental section on
line iii-40 of Figure 9, including a portion of a
container to which the cap is applied.
Figure 11 is an enlarged fragmental section on
line lL-H of Figure 9 and adjacent container
portion.
an outwardly curved portion 23’.
The inclination at 33 of the lugs and the di
ameter of the circle tangential to the lower ex
tremities of the said portions are such that when
the cap is set on the container, as in Figure 5,
pressure applied to the top of the cap will cause
any lug formation above the ring to be cammed
readily radially outwardly as the lugs move
downwardly across the ring, the uninterrupted or
Figure 12 is an enlarged fragmental section on
line i2—i2 of Figure 9 and adjacent container
portion.
unmutilated arc portions 36 of the edge 23, be
tween the lug formations, straightening some
what during this operation so as to avoid or
Figure 13 is an enlarged outside fragment of
the cap of Figure 9 in elevation.
the lugs of each set being immediately joined by
, '
Figure 14 is an enlarged inside fragment 0
minimize the deforming effect on the lugs. With
normal tolerances, the spacing between the lock
ing ring 29 and the arc portions 36 is such that
when the apices 34 are on the maximum circle
of the ring 29 the center portions of the arcs will
ure 13.
20 not quite touch the ring. As the apices pass be
The cap 20 shown in Figures 1 to 7 is formed ‘low the maximum circle of the ring the inclined
portions 35 exert a camming action as the lugs
of the usual resilient sheet metal and comprises
a circular solid top portion 2| and a substantially
and the arc portions 36 resume substantially
cylindrical depending skirt 22 having at its lower
their original relationship, and gasket 24 is drawn
edge a continuous outwardly curled or rolled edge 25 forcibly against lip 28 so that the latter is sub
stantially embedded in the gasket as shown in
23. An annular gasket 24, preferably of mate
Figures 3 and 4.
rial such as semi-vulcanized rubber, is adhered
to the under surface of the cap top and the latter,
Due to the double gripping points provided by
as shown, is provided with a circular top inden
each of the twin lug formations, the cap is held
tation 25. Reference numeral 26 designates a 30 securely on the container, but due to the localiza
container, here shown as being a glass jar, the
tion of the gripping zones, and also to the rela
container having a mouth 21, an angular lip 28
tively easy angle of the upper lug portions 35,
adapted to engage the gasket below the circular
the cap can ‘be readily removed by a prying tool
indentation 25, a continuous external locking
and this without danger of damaging the locking
ring or bead 29, and a pry-off ledge 30 which is 35 ring. In view of the outward spacing of the cap
the cap of Figure 9 in elevation, and
‘
Figure 15 is a section on line i5—l5 of Fig
appropriately spaced below the edge 23 when the
skirt from the locking ring, the portions 35 of
cap is applied to the container as in Figures 1, 3
the lug will always be sufficient to take care of
and 4. With normal tolerances, the internal di
minimum tolerances in the locking ring. The
ameter of the skirt is materially greater than the
apices 34 should be sumciently low to permit the
maximum diameter of the ring 29, as seen in 40 portionsv 35 to accommodate maximum tolerances
Figure 3.
of the locking ring, it, of course, being neces
The skirt 22 is provided with three equi-dis
sary in all cases that the portions 35 engage be
low the ring for locking effect.
tantly spaced twin lug formations, each of the
said formations comprising two lugs 3| and 32
The angle of the upper portion 35 may be var
struck inwardly in the curled edge. As seen in
ied somewhat and in Figure 8 the corresponding
Figure 4, for example, each lug is of generally
portion 35’ has an angle of around 20°. The
?at V-section in a bisecting axial plane and has
angle should not be so slight and run so far up
a lower portion 33 in the curled edge inclined
into the skirt as to give too much of a radial
downwardly and outwardly from the apex 34 and
component, since, as has been mentioned, in such
an upper portion 35 inc1ined upwardly and out— 50 case the cap will tend to lift just above the lugs
wardly and merging into the skirt portion above
so that the seal at these points is apt to be im
- paired.
the curled edge at an angle of about 30°. The
lower and upper portions of the lugs a?ord a
It may be mentioned that Figures 1 and 2 show
shoe horn eifect in the cap applying and remov
a cap in a substantially exact commercial size,
ing operations, respectively, easing the lugs 55 the inside diameter of the skirt being about 21/4
across the locking ring in either direction. The
inches with the circumference thus slightly over
circle tangent to the apices 34 of the lugs has a
seven inches. The engaging points of the lugs of
diameter appropriately smaller than the maxi
each lug formation are substantially one-half
mum diameter of the ring 29. As seen in Fig
inch apart, this spacing enabling the lugs to be
ures 4 and 5, the curled edge is somewhat ?at 60 formed without danger of damaging the skirt
tened at the lugs, but this is merely incidental to
metal. The same spacing of the twin lugs can
the forming operation.
be maintained in caps of larger diameter. The
distance between adjacent sets of lugs is always
It will be noted that the outer extremity of the
edge portion 23' between the lugs 3| and 32 is
at least twice the distance between the contact
tangential to the outer circle of the edge 23 so 65 points of the lugs of each set. In the example
that the lugs are well de?ned. Ordinarily, these
shown in Figures 1 and 2 the distance between
lugs are placed as closely together as is possible
the lugs of each set is about 1/14 of the circum
without; subjecting the skirt to destructive bend
ference.
ing stresses in manufacture. The lugs are sub
If it is desired to space the lugs of the twin lug
stantially arcuate, perhaps approaching a V, in
a sectional plane normal to the cap axis so that
during application to the container the lugs have
line contact with the ring 29 and point contact
when in ?nally applied relation. The inward
curves of the lugs in the curled edge clearly ap
' formations more closely, the design shown in Fig
ures 9 to 15 may be used. According to this mod
i?cation, the twin lugs 31 and 38 are in effect
substantially the same as before, but the portion
35 of the curled edge between the lugs terminates
outwardly substantially within the outer curve of
2,408,465
,
6
5
the full arc portions 40 of the edge. Since there
is less extreme bending of this portion 39 as com
pared to the portion 23' of the ?rst embodiment,
' maximum diameter than the maximum inside
skirt diameter when the cap is applied, said lower
and upper portions affording a shoehorn effect
the adjacent lugs can be substantially closer to- .
in, the cap applying and removing operations re
gether without danger of injury’ to the metal in 5 spectively, the distance between the contact
manufacture. The lugs 25‘! and 38 are somewhat
points of the lugs of each set of lugs being about
sharper, i. e., more nearly of V shape, in cross
one-fourteenth or less of the inside circumfer
section than the lugs of the ?rst embodiment, but
ence of the skirt.
their contours in axial planes are substantiall
3. The combination with a container having a
the same.
. ‘
portion de?ning a mouth terminating in a lip,
The central axial section of the intervening
said portion including a rigid'continuous exter
edge portions 39 is substantially as shown in Fig
nal locking ring, of a snap-on and pry-o? cap
including a top and a resilient substantially
ure 11. As in the ?rst embodiment, there is line
contact at each lug during application and point
cylindrical ski-rt depending from said top and
engagement with the locking ring when the cap, ‘
is fully engaged; The sealing e?‘iciency is the
same as in the ?rst embodiment, the main dif
ference being that the lug formations of the sec~
ond embodiment are less conspicuous and hence
preferable in some situations.
While with three sets of twin lugs added secu
rity of seal’ is afforded as over three equi-dis
tantly spaced single lugs, there is still maintained
having a continuous curled bottom edge, a gas
ket in said cap, said skirt being provided with
three only of substantially equi-distantly spaced
sets of two inwardly projecting lugs of which each ,
lug of each set has an upper portion which in
clines gradually outwardly and upwardly relative
to the inner surface of the skirt above said edge
and merges into, said surface a distance above
said edge and has a lower portion in said edge
the desirable feature of the latter that the prying
inclined gradually downwardly and outwardly
off at one of the lug formations results in the
relative to said inner surface, said lugs being en
gaged under said ring each with point contact
lifting up of more than half of the cap.
.
It will be understood that the invention is sus
ceptible of other variations as to'form and ar
rangement of parts without departure from the
scope of the following claims.
and with a wedging effect so that a continuing
axial tension is exerted on said skirt whereby to
compress said gasket between the cap top and
the container lip, the internal diameter of said
skirt being substantially greater than the maxi
mum diameter of said locking ring, said lower and
and a resilient substantially cylindrical skirt de- /
upper portions affording a shoehorn effect in the
pending from said top and including a continu
cap applying and removing operations respective
ous curled bottom edge, said skirt being provided . ~
ly, each lug having an inward curve in the plane
with three only of substantially equi-distan-tly
of said edge and the adjacent ends of the curves
spaced sets of two inwardly projecting lugs of
of the lugs of each set being immediately joined
which each lug of each set has an upper portion
by an outwardly curved portion of said edge, and
which inclines gradually outwardly and upwardly
the distance between adjacent sets of lugs being
relative to the inner surface of the skirt above Iii) at least twice the distance between the contact
I claim:
1. A snap-on andpry-o?f cap including a top
said edge and merges into said surface a distance
above said edge and has a lower portion in said
edge inclined gradually downwardly and out
wardly relative to said inner surface, said lugs
being each engageable with point contact under
a container locking ring of substantially less
points of the lugs of each set.
>
4. The combination with a container having a
portion de?ning a mouth terminating in a lip,
said portion including a rigid continuous exter
45 nal locking ring, of a snap-on and pry-off cap
including a top and a resilient substantially cylin
maximum diameter than the maximum inside
drical skirt depending from said top and having
skirt diameter when the cap is applied, said lower
a continuous curled bottom edge, agasket in said
and upper portions affording a shoehorn effect
cap, said skirt being provided with three only of
in the cap applying and removing operations re 50 substantially equi-distantly spaced sets of two in
spectively, each lug having an inward curve in
wardly projecting lugs of which each lug of each»
the plane of said edge and the adjacent ends of
set has an upper portion which inclines gradually
the curves of the lugs of each set being immedi—
outwardly and upwardly relative to the inner sur
face of the skirt above said edge and merges into
said edge, and the distance between adjacent sets 55 said surface a distance above said edge and has a
ately joined by an outwardly curved portion of
of lugs being at least twice the distance between
lower portion in’ said edge inclined gradually
the contact points of the lugs of each set.
downwardly and outwardly relative to said inner
2. A snap-on and pry-off cap including a top
surface, said lugs being engaged under said ring
and a resilient substantially cylindrical skirt de
each with point contact and with a wedging e?ect
pending from said-top and including a continu 60 so that a continuing axial tension is exerted on
ous curled bottom edge, said‘ skirt being pro
said skirt whereby to compress said gasket be
vided with three only of substantially equi-dis
tween the cap top and the container lip, the in
tantly spaced sets of two inwardly projecting lugs
of which each lug of each set has an upper por
tion which inclines gradually outwardly and up
wardly relative to the inner surface of the skirt
above said edge and merges into said surface a
distance above said edge and has a lower portion
in said edge inclined gradually downwardly and ’
outwardly relative to said inner surface, said lugs
being each engageable with point contact under
a container locking ring of substantially less
ternal diameter of said skirt being substantially
- greater than the maximum diameter of said lock
ingring, said lower and upper portions affording
a shoehorn effect in the cap applying and remov
ing operations respectively, the distance’ between
the contact points of the lugs of each set of lugs
being about one-fourteenth or less of the inside
circumference of the skirt.
LOUIS, L; LAUVE.
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