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Патент USA US3057516

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Oct. 9, 1962
F. P. KROENERT
3,057,501
BOTTLE CAP CONSTRUCTION
Filed Nov. 1e, 1960
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'3,057,501
United States Patent ’O ” ice
Patented Oct. 9, 196.22
1
3,057,501
BOTTLE CAP CONSTRUCTION
Fred P. Kroenert, Brookfield, Wis., assigner of one-half to
Lore Kroenert, Brookfield, Wis.
Filed Nov. 18, 1960, Ser. No. 70,264
8 Claims. (Cl. 21S-39)
The drawings illustrate the ybest mode presently con
templated of carrying out the invention.
In the drawings:
FIGURE 1 is a transverse section showing the plastic
insert of the invention;
I
-
FIG. 2 is a bottom elevation of the insert;
FIG. 3 is a transverse section showing the insert dis
posed within the cap prior to sealing;
This invention relates to a 'bottle cap construction and
FIG. 4 is a transverse section Ishowing the cap sealed
more particularly to a plastic insert for a metal bottle cap.
The conventional type of bottle cap structure includes 10 on the bottle;
FIG. 5 is a transverse section showing the plastic insert
an outer metal cap and a cork insert. In the sealing op
disposed within a modified form of metal cap; and
eration, the cork insert is forced against the upper edge
FIG. 6 is a top view of the structure shown in FIG. 5.1'
of the bottle and the skirt or flange on the metal cap is
The drawings illustrate a flexible plastic insert 1 which
then crimped around the bead at the upper end of the
bottle to clamp the cap to the bottle. The cork inserts 15 is disposed within a metal bottle cap 2 and is ad-apted
to close olf or seal the opening in a bottle 3.
which are commonly used have several disadvantages
The insert 1 is 'adapted to- be formed of a non-toxic,
in that the cork, being `a wood product, is subject to de
terioration or decomposition after extended periods of
shelf life. Furthermore, the cork, being porous, is often
relatively ilexible plastic such a polyethylene, polyvinyl
cloride, polypropylene, or the like. However, any type of
contaminated with other `foreign particles. For example, 20 the common thermoplastic resins which are non-toxic
in the registering operation in a bottle sealing process,
and will not react with, or be decomposed by, the con
great quantities of bottle caps are dumped into a con
tainer and the caps are moved through an »aligning ap
tents of the bottle can be used for the insert 1.
_
As best shown in FIG. l, the insert 1 includes a gen
erally flat, central base portion 4 which is adapted to be
paratus which aligns or registers the same for sealing.
In the bulk container the sharp edges of the flanges of 25 disposed against the inner surface 5 of the cap 2. An
annular flange 6 extends axially from the base 4 and the
the caps often scrape olf the laquer on adjacent caps,
llange includes an inner wall 7 and a tapered outer wall
and the lacquer particles penetrate into the porous cork
8 which is connected to the inner wall 7. The outer Wall
inserts and subsequently may contaminate the material
8, being tapered, provides a wedge surface and is adapted
within the bottle. To eliminate these problems, the cork
inserts, in many cases, have been lined with a metal foil, 30 to engage the inner surface of the neck of the bottle to
provide a seal lfor the opening in the bottle. The angle
such as aluminum foil, which provides a smooth, non
toxic surface.
of taper A, as shown in FIG. 1, is in the range of 3° to
10° with about 5° being preferred.
The present invention is directed to a plastic insert for
In addition to the flange 6, the insert 1 is also provided
a bottle cap which is sanitary and nontoxic and provides a
greater sealing action for the bottle. The plastic insert 35 with an annular lip 9 which is disposed radially outward
can be used with either the standard type of metal cap
or other newly developed metal caps which operate on
of the iiange 6. As shown in FIG. 1, Ithe lip has a sturdy
root portion yand has a substantially smaller axial depth
than the flange 6. In the sealing position, the lip 9 is
adapted to be engaged by the upper edge of the bottle 3
the metal cap and includes an annular flange which ex 40 and is thereby deflected inwardly. The flexibility of the
plastic serves to bias the lip outwardly into tight sealing
tends outwardly of the cap. The outer peripheral sur
engagement with the bottle 3 and thereby provide a sec
face of the ñange is tapered and is adapted to be wedged
ondary seal or a corking action. If, for some reason, the
within the opening in the bottle. In addition to the wedge
internal pressure breaks the seal between the wedge
surface, an annular lip is provided on the insert which is
spaced radially outward yfrom the flange. The lip is 45 surface 8 and the bottle 3, the secondary seal between'
the lip 9 and the bottle will prevent leakage.
' I
substantially smaller in axial depth than the flange and
The insert 1 is also provided with a generally ñat rim
is adapted to be engaged by the upper edge of the bottle
10 which extends radially outward from the lip 9, and
and dellected inwardly to provide a secondary seal with
the bottle.
terminates at the flange or skirt 11`of the cap 2. As
With the present insert, the internal pressure within 50 best seen in FIG. 1, the rim 10 is offset from the plane of
the bottle acts to force the annular flange radially out
the base -4. With this construction, when the insert is
brought into contact with >the upper edge of the bottle
ward into sealing engagement with »the inner surface of
during the sealing action, the force applied to the cap
the neck of the bottle and the annular lip provides a sec
the lever arm principle to provide the sealing action.
More specifically, the plastic insert is disposed within
ond seal or corking action which further increases the
sealing characteristics of the insert.
`
The plastic insert which is made out of a flexible plastic,
such as polyethylene, is nontoxic and sanitary and will
will be applied to the base 4, thereby serving to move the
55 flange 6 outwardly into tight engagement with the inner
surface of the neck of the bottle.
-
v
As best shown in lFIG. l, the inner Wall 7 is substan
not deteriorate or absorb foreign matter.
tially thinner than the outer wall 8 and this enables the
As the insert includes the ñange which is to be wedged
wall 7, which is subjected to the internal pressure of the
within the opening Áof the bottle and also includes the 60 bottle in service, to be deflected outwardly by the pres
annular lip which serves to provide »a corking action, the
sure and thereby increases the sealing effect of the outer
sealing effect of the plastic insert is substantially greater
wall 8 with the bottle 3. `
'
than that of presently used inserts. Due to this increased
In the sealing operation, the insert 1 is initially assem
sealing effect, a smaller force can be applied to the bottle
bled within the cap 2 and an adhesive can be employed if
at the time of sealing and therefore the bottles can be 65 desired to bond the 'insert to the inner surface 5 of the
thinner and less costly. Furthermore, as the insert itself
cap. The flange 11 of cap 2 is forced against the upper
provides some holding action due to the wedging surface,
end of the bottle and the skirt 11 is bent inwardly and
a thinner metal cap can be used than in the conventional
crimped to provide a series of lips 12 which engage the
construction in which the cap itself provides the entire
lower edge of the bead 13 of the bottle to securely hold
holding action.
70 the cap to the bottle. As best shown in FIG. 4, the outer
Other objects and advantages will appear in 4the course
edge of the rim 10 is wrapped around the upper end of
of the following description.
~ the bottle land this further increases the sealing effect.
3,057,501
4
3
axially outward from said base section, a flexible annular
outer wall connected to the outer portion of said cylin
drical Wall and diverging radially outward in a direction
axially inward toward the plane of the base section, said
walls adapted to be inserted within the opening of the
bottle and said outer wall adapted to wedgingly engage
‘FIGURES 5 and 6 illustrate the use of the plastic in
sert of the invention with a modified form of a metal
cap. As shown in these figures, the cap »14 is provided
with a series of radial ribs 1S which extend from the
centerA of the upper surface 16 of the cap radially out
ward and axially down along the skirt 17. The radial
the neck of the bottle to seal the opening, a generally flat
ribs serve as lever arms so that when pressure is applied
rim connected to the axially inward portion of said outer
to the center of the upper surface 16, the ribs will tend
wall, and a flexible annular lip connected to said rim at
to move the skirt outwardly to an expanded posit-ion, and
conversely, when the pressure is released, the skirt will 10 a location adjacent said outer wall and having an axial
length substantially less than the axial length of said
move to a contracted position.
outer wall, said lip adapted to be engaged by the upper
The cap 1'4 is applied to the bottle 3 in a manner similar
edge of the bottle bordering the opening therein and to
to that described above, the skirt being crimped inwardly
he deformed radially inwardly, with the resiliency of said
to engage the lower surface of the bead 13 of the bottle.
The use of the tapered surface 8 in the plastic insert of 15 lip urging said lip into tight sealing engagement with the
upper edge of the bottle to provide a secondary seal.
the invention serves to take up or compensate for any
4. The structure of claim 3, in which the outer wall
variance or irregularity in the diameter of the opening
diverges outwardly at an angle of 3° to 10° to the axis
in the bottle and provides a tight wedging seal between
of the -insert and has a substantially greater thickness than
the insert and the bottle. The internal pressure within the
the inner Wall to permit the inner wall to be deformed
bottle acts against the thin inner wall 7 to dcform the
radially outwardly ‘by the internal pressure in the bottle
and thereby increase the sealing effect of the outer wall
same outwardly and thereby increases the sealing effect
with the bottle.
In addition to the sealing effect achieved by the tapered
with the neck of the bottle.
surface 8, a secondary seal is provided by the engagement
5. A flexible plastic insert to be used with a bottle cap
of the deformable lip 9 with the upper edge of the bottle. 25 for sealing the opening in a bottle, comprising a gen
erally flat base section adapted to be disposed generally
The resiliency of the plastic tends to bias or urge the
lip into tight sealing engagement with the bottle to pro
flatwise within the cap, a generally cylindrical inner wall
vide an auxiliary seal or corking action.
extending axially outward from said base section, a flexi
ble annular outer wall connected to the outer portion of
Due to the holding or sealing action of the insert itself,
thinner metal caps can be employed than in the conven 30 said cylindrical wall and diverging radially outward in a
direction axially inward toward the plane of the base
tional bottle caps in which the cork insert does not, in
itself, provide any holding action. This can result in a
section, said walls adapted to be inserted with the open
ing of the bottle and said outer wall adapted to wedgingly
20 to 30% decrease in the weight of steel required for
engage the neck of the bottle to seal the opening, a gen
the cap so that the bottle cap assembly using the plastic
insert of the invention is competitive pricewise with a 35 erally flat rim connected to the axially inward portion
cap construction utilizing foil-covered cork inserts.
of said outer Wall, and an annular lip connected to said
The insert of the invention can be used with all stand
ard caps so that the existing facilities for producing the
caps need not be changed when employing the present
insert. The only change which may be required in exist 40
rim at a location adjacent said outer wall and having an
ing facilities is »in the registering equipment in the seal
tremity thereof, said lip adapted to be engaged by the
ing operation.
upper edge of the bottle bordering the opening therein
and to be deformed radially inwardly, with the resiliency
Similarly, as the force applied to the cap is imparted
at an angle through the wedge surface against the inner
surface of the neck of the bottle and not directly against
the top of the bottle, the bottles can lbe of thinner construc
tion with a resulting saving in cost.
axial length substantially less than the axial length of
said outer Wall, said lip being generally tapered and hav
ing Ia greater thickness at the `root than at the outer ex
of said lip urging said lip into tight sealing engagement
with the upper edge of the bottle to provide a secondary
seal.
6. A bottle cap assembly, comprising a cap having a
templated as being within the scope of the following
central portion and a peripheral skirt extending outwardly
from the central portion and adapted to `be clamped to the
claims particularly pointing out and distinctly claiming
50 outer surface of the neck of a bottle; `and a flexible
Various modes of carrying out the invention are con
plastic insert having a base section disposed generally
the subject matter which is regarded as the invention.
I claim:
1. An insert to be used for sealing an opening in a
vessel, comprising a central base section, an annular
flange extending axially from the base section and adapted
flatwise to the inner surface of the central portion of
the cap and having an annular flange extending axially
from the base section with said flange including an outer
to be received within the opening in the vessel, said flange
peripheral surface adapted to wedgingly engage the inner
surface of the neck of the `bottle bordering the opening
having a peripheral surface progressively decreasing in
therein to seal the same, and said insert having an
55
annular deformable lip disposed radially outward of
external diameter in a direction away from the base sec
tion, said peripheral surface adapted to wedgingly engage
the inner surface of the vessel bordering the opening, and
a generally resilient deformable lip disposed radially out
ward of the flange and having an axial depth substan
tially less than said flange, said lip adapted to be engaged
by the upper edge of the vessel bordering the opening
the flange and adapted to engage the upper edge of the
60 bottle and to be deformed thereby, said lip having an
therein and to be deformed radially inwardly, with the re
65
siliency of said lip urging said lip into tight sealing en
gagement with the upper edge of the vessel to provide a
secondary seal.
2. The structure of ‘claim l, and including a generally
flat rim extending radially outward from the lip and
lying in a plane offset axially from the plane of the base
section.
3. An insert to be used with a bottle cap for sealing
the opening in a bottle, comprising a central ybase sec
axial depth substantially less than said flange and adapted
to Ábe disposed in tight sealing engagement with the upper
edge of the bottle to provide a secondary seal for the
opening.
7. A -bottle cap assembly, comprising a cap having a
central portion and a peripheral skirt extending outwardly
from the central portion and adapted to be clamped to
the outer surface of the neck of a bottle; and a llexible
plastic insert having a base section disposed generally flat
wise to the inner surface of the central portion of the
cap, a flexible generally cylindrical inner wall extending
axially outward from said base section, a flexible an~
nular outer wall connected to the outer portion of said
cylindrical wall and diverging radially outward in a di
tion, a flexible generally cylindrical inner wall extending 75 rection axially inward toward the plane of the base sec
3,057,501
5
tion, said Walls adapted to be inserted Within the open
ing of the bottle and said outer wall adapted to wedg
ingly engage the neck of the bottle to seal the opening,
said base section, said peripheral surface Áadapted to
wedgingly engage the inner surface of the article border
ing the opening therein to seal the same, and an annular
a generally flat rim connected to the axially inward por- -
deformable lip disposed radially outward of the ñange
tion of said outer wall, and a flexible annular lip con
nected to said rim at a location adjacent said outer wall
and adapted to engage the upper edge of the article bor
dering the opening and to be deformed thereby, said lip
and having an axial length substantially less than the axial
extending axially of the base section with the axially out
length of said outer wall, said lip adapted to be engaged
ward extremity of said lip terminating short of the axially
by the upper edge of the bottle bordering the opening
outward extremity of said flange and being separate and
therein and to be deformed radially inwardly, with the 10 spaced from said flange, said lip adapted to be disposed
resiliency of said lip urging said lip into tight sealing
in tight sealing engagement lwith the upper edge of the
engagement with the upper edge of the bottle to provide
article to provide a secondary seal for the opening.
a secondary seal.
8. An insert to be employed for sealing an opening in
an article, comprising a generally ilat base section, an 15
References Cited in the íile of this patent
annular flange extending axially outwardly from the base
section and having a peripheral surface progressively de
creasing in external diameter in a direction away from
FOREIGN PATENTS
498,700
Italy _______________ __ Sept. 30, 1954
:UNITED STATES PATENT OFFICE
CERTIFICATE OF CORRECTION
Patent No. 3,057 , 501
October 9 ,
1962
Fred P. Kroenert
It is hereby certified that error a ppears in the above numbered vpat-
ent requiring correction and that the sa id Letters Patent should read as-
corrected below.
Column 4, line 32, for» "with" read -- within --.
signed and sealed this 26th day of March 1963@ì
( SEAL)
Attest:
ESTON G. JOHNSON
Attesting Officer
, DAVID L. LADD';
Commissioner of Patents
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