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Патент USA US3074589

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Jan. 22, 1963
Filed March 20, 1962
United States Patent O?Fice
Patented Jan. 22, 19%3
truncated cone for about one quarter of its height.
Erich Golde, Tatteukotenerstr. 4, Geretsri-erl,
Upper Bavaria, Germany
Filed Mar. 20, 1962, Ser. No. 180,998
Claims priority, application Germany May 18, 1961
7 Claims. (Cl. 215-42)
The object of this invention relates to a closure vfor
and hence the removal of the contents of the bottle can
no longer be effected, without destruction of a part of the
skirt, the lower beaded ring or edge of the locking mem
ber is tightly received, whereby the said upper and lower
circular limits of the groove keep the locking member of
the cap, and hence the locked cap itself, from being dis
placed in an axial direction upward or downward. The
said groove also prevents the locking member from sliding
bottles which, after being put'on, cannot be released,
In the
circular groove or recess formed on the inside of the cap
There are known ‘cap closures which are provided with
a'resilient locking means for the purpose of ensuring the 15
closed position.‘ This locking means is locked under a
beaded edge on the container mouth when the cap is
put on, and thus the removal of the cap is prevented.
There are also caps made of a soft elastic plastic such
that it becomes unnecessary to make a special gasket.
As the elasticity or ?exibility of the locking means per
mits easy ‘removal of the closure from the top edge of the
mouth','this cannot serve as a tight ?tting surface or seal.v
The sealing of the bottle contents must rather be effected
inside the top edge of the month by means’ of a collar,
cup or hollow beading which projects from the cap in
ward adjacent under pressure to the inner mouth Wall.
In order to prevent the possibility of the lower edge of
the cap being raised by‘means of a small tool such as a
out of position in the cap while the latter is being locked
in place on the bottle.
The invention is described more fully below with refer
ence to FIGS. 1 to 4.
FIGURES 1, 3 and 4sl1ow cross sectional views of
different typical embodiments of the novel cap closure
emplaced on bottle necks or openings.
FIGURE 2 is a plan view of the locking member shown
in FIGURE 1.
' The bottle neck 1 has at or below its mouth an annular
outer heading 2, which serves as a support or stop for lock
ing member 3qafter mounting of the cap closure on the
bottle ‘mouth. The cap closure consists of two cooperat
ing thermoplastic parts, a unitary cap 4 and a separate
spring or locking member 3, the latter beingsnappedinto
place or otherwise tightly held in the latter._ Cap 4 is
provided with a depending, downwardly open sealing col
lar '5 adapted to form a tight seal with the inner wall of
the bottle mouth. However, instead of the collar being
open at the bottom, it can be in the form of a cup or de
pression 6 as shown in FIGURE 3, or a hollow heading
7 as shownin FIGURE 4‘.
In order to ensure a good seal
penknife, adapted to press outward. the projections of ' a the cap is desirably made of a resilient, ?exible thermo
the locking means and thus release the closure, a'special
plastic_resin, for example, polyethylene or the like. The
ring~shaped intermediate member of'harder material has
outer cover or skirt 8 of cap 4 has near its lower edge a
been. suggested, which rests on a ledge of the bottleneck,
radially inward projecting annular beading 9, which‘ may
and surrounds and accommodates the lower edge of‘the 35 be arranged about 5 to 10 mm. below the outer heading 2
closure cap. This intermediate member, however, makes
the closure cap more expensive and harder to apply.
The construction of the closure cap according to the
present invention avoids these disadvantages and at the
of the bottle neck, and serves to support the lower beaded
edge 15 of the locking member 3‘.
Locking member 3 can be suitably made of a harder or
stiffer thermoplastic resin, such as so-called “low pressure”
same time makes possible the use of the closure cap even 40 polyethylene (prepared for instance, by the method de
for a plastic blown bottle whose mouthpiece is elastic.
According to this invention a soft resilient plastic is
provided as material for the closure cap in order to make
possible the insertion of the inward projecting sealing rim
or heading into the bottle mouth while the locking mem
her which is set in the cap is made of a harder plastic or
similar material. Further, the locking member has the
form of a hollow truncated cone which has a strong cir
cular bottom or beaded edge constituting about 1A of the
height of the cone and a number of slits or slots extend
ing from the top down approximately over the remaining
34 of the height of the cone. As a result of these slits
the locking member can be easily slid over an outer bead
ing provided on the container mouth or neck as the slits
allow the cone segments to spring apart. The outer bead- .
ing must of course have a greater outside diameter than
the upper diameter of the truncated cone so as to permit
a locking action between the two. However, as soon as
scribed in Belgian Patent 533,3 62 of Karl Ziegler) or poly
styrene, and has the form of a hollow truncated cone,
with an angle of inclination of 20° to 35°. From the top
down the truncated cone cover is slotted for about 3A
of its total height, and preferably has a lesser wall thick
ness (about 0.5 to 1 mm.) in its slotted upper portion than
in the solid bottom portion. The slots 14) are shown in
FIGURE 2. They can, of course, have di?erent forms
and widths and be provided in a different number than
that shown. The lower, considerably thicker edge 15 of
the locking member is ?rmly and tightly supported. on the
aforementioned annular heading 9 in the wall or skirt
of the cap. Above annular beading 9 and above the lower
edge of the locking member the outer cover 8 slants in
ward into the cap so that an annular groove or circum
ferential recess having a conical inside wall is formed on
the inside of the cap skirt, which recess thus inter?ts with
the conically shaped outside surface of the beaded ring of
the locking member is locked under the above mentioned
the locking member and prevents the locking member
beading, the locking member and hence the closure cap 60 from sliding up or down within the cap in an axial direc
can no longer be removed upward or lifted off in spite of
the fact that the wall thickness of the cap may be only
Desirably the locking member 3 is pressed into cap 4
about 0.5 to 1 mm. so as to provide for the necessary
before use of the closure until the lower edge of the lock
resilience, as the hardness or stiliness of the material
chosen for the fabrication of the locking member pre
vents the bending or folding in of the cone sections. The
lower edge of the locking member is ?rmly supported
ing member is locked in recess 11 on the inside of cover
8 of the cap. When the bottle closure is then placed
on the bottle mouth the contents of the bottle cannot
be removed until after the closure or a part of it is
on a circular beading of the skirt of the cap projecting
destroyed. Thus, for example, the cover plate 12 of cap 4
radially inward and desirably has a wall thickness about
can be punctured, or the tip of the pouring spout 13
twice or three times that of the slit part of the truncated 70 shown in FIGURE 4 can be cut off. Still other variations
cone. Above the said circular heading the skirt of the
and modi?cations of the invention will occur to those
cap projects inward and abuts close to the wall of the
skilled in the art without departing from the spirit and
scope hereof. The invention is particularly pointed out
inthe appended claims.
I claim:
1. A tamperproof plastic bottle closure composed of a
unitary ?exible plastic cap member and a separate resilient
locking member tightly held therein and adapted to be
locked on a bottle having a beading on the neck thereof,v
said flexible plastic cap- member comprising a cover
portion adapted to ?t over the mouth of a. bottle, a
sealing collar ‘depending, from said cover portion. and. 1
adapted to form a seal with. the inner wall of said
bottle mouth,_. and a skirt depending fromsaid cover
portion» and spaced radially outward: from said. col~
lar, thereby being adapted to skirt over the outer
mouth wall of said bottle,.said skirt having‘ a circum 15
ferential recess in a lower portion of its inner wall;v
said locking member comprising a thin hollow truncated
cular cross-section composed of a unitary cap member
and a separate resilient locking member ?rmly held there
in and adapted to be locked on a bottle,
said cap member comprising a ?exible plastic cover
portion adapted to seal the mouth of a bottle, a
skirt member depending‘ from said cover portion and
adapted to be spaced‘ radially outward over said bot
tle mouth, theinner wall of said skirt member being
provided with a substantially circular groove near the
lower edge thereof; and
said locking member comprising a hollow, truncated
molded plastic cone having a plurality of slots ex
tending from the top down over a major portion of
its height and having a solid closed beaded ring near
the base thereof, said cone decreasing“ in diameter
upwardly so; that its upper slotted- edge is; adapted to
slidedown over and lock under-a beading provided on
the neck of the bottle to be capped and so that saidv
beaded ring on thev cone is. adapted- to; be tightly're
cessed in the: groove of said cap skirt, thereby pre
cone provided with’ a‘ plurality of slots- extending
from thetop down over a major portion: of its 20
venting axial movement; or said- locking: member in
height and having a solid bottom beaded edge. of a
said closure“
dimension such that it is adapted to be tightly: re
6a A bottle closure. according to claim 5 wherein said
ceived in saidrecess- of. the skirt, said truncated cone.
cap. member comprises: a sealing: collar depending from
being dimensioned such‘ that.’ it is- adapted to slide
down over and become locked by its upper edge 25 said cover‘ portion ‘and. adapted: to form a seal’ with the:
inner- Wall of said bottle: mouth;
under said beading of'the bottle.
7. A, closure: according to claim 5 wherein said groove
2'. A bottle closure according to claim: 11 wherein said
is formed by a: bead projecting inwardly- from said skirt
locking member is made of a stiffer plastic than said- cap,
and by an‘ upwardly and‘ inwardly’ slanting’ portion of; said"
portion and has‘ a. two to three; times thinner wall; thick~
ness in its slotted portion than in its unslotted lower por 30 skirt adapted. to abut: said enlarged ring of said locking‘
tion, said’ slotted portion of said locking member having a
wall thickness of about 0.5- to 1 mm.‘
3'. A bottle closure according to claim, 1 wherein an-in
wardly projecting beading is provided adjacent, the lower
References Cited in the ?le of this patent
limit of’ the circumferential recess of, the cap skirt.
4. A bottle closure according to claim 3 wherein,» both’
the side wall of the circular groove of, the cap- skirt and
Morin __________ __r_.___,__ Oct. 27, L936
the outsidesurface of the beaded ring of the locking mem~
France ______________ __ Aug. 8', 19,60
her are conical so as to inter?t with‘ each. other.
5. A molded plastic bottle- closure» of substantially cir 40
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