Note: Descriptions are shown in the official language in which they were submitted.
CA 02484039 2004-11-19
16950
CHILD RESISTANT PACKAGE
This invention relates to child resistant packages.
Background an_d Summary of the Invention
Child resistant packages for medicine and poison containers have been devised
in
the prior art for the protection of young children. Among the prior art types
of safety closures
are those which involve the ratcheting engagement of teeth on a container
screw cap with a
yielding locking element or tooth on the container neck or body portion, the
container locking
tooth responding to a downward manual pressure to effect release of the
closure of the child
resistant package. Examples of such prior art type of cap are contained in
U.S. Patent Nos.
3,700,133; 3,884,379; 3,892,325 and 3,902,620. Other types of packages have
radially
deflectable lugs as shown in U. S. Patent Nos. 4,427,124; 4,984,002 and
5,413,233.
It is also known in the prior art to provide a child resistant package in
which a
movable release element on the closure responds to lateral or side pressure to
free the cap from
interlocking engagement with teeth or other like projection means on the
container. In U.S.
Patent No. 4;036,385, the child resistant package consists of a container body
having a yielding
resilient manually operable release element positioned on the side wall of the
container near the
end thereof which receives a screw-threaded closure. The release element
carries a single
upstanding locking lug which is capable of ratcheting to interlocking
engagement with a locking
lug on a bottom skirt member of the threaded cap during rotation of the
closure to gradually
tighten it down on the threaded portion of the container. The release element
responds to
2 0 pressure applied by the thumb at one side of the container to shift the
lug of the release element
inwardly on a substantially radial path relative to the axis of the container
and container closure.
This movement separates the lug on the release element from the locking lug of
the threaded
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8 f
closure so that the closure may be removed by simple-rotation. The arrangement
presents a
complex manipulation necessary to efFect release of the cap which achieves the
result of making
it difficult for small children to operate.
United States Patent No. 5,'7I 1,442 discloses a child resistant package
including
a container having an open end and multiple threads on an external surface of
the container
adjacent the upper end. A closure having abase wall and a peripheral skirt has
an inner surface
formed with multiple threads corresponding in number to the multiple threads
on the container
for engaging the threads on the container. A release element is formed
integrally on the exterior
surface of the container below the threads: The- release element includes an
integral axial lug
extending upwardly toward the open end of the container. The closure has a
plurality of
circumferentially spaced stops on the inner surface of the skirt of the
closure below the threads
corresponding in number to the threads on the closure anal the number of
threads on the container.
The lug on the release element normally extends upwardly far engagement with
at least one of the
stop lugs such that when the release element is pressed radially inwardly, the
lug is disengaged
from engagement with a stop and the closure can be removed by unthreading the
closure from the
container.
Among the objectives of the present invention are to provide a child resistant
package which is corisurner fiiendly; wherein the child resistant package is
easy to apply and close;
wherein the child resistant package requires.a lesser force or torque when the
closure is rotated
2 0 to apply the closure to the container that is substantially less than the
torque required to remove
the closure from the container; wherein the child resistant package minimizes
the wear on a
locking lug during application of the closure to the container; wherein the
child resistant package
minimizes the deflection of the release element on the container when the
closure is rotated to
apply the closure to the container; wherein the child resistant package has a
locking lug which
2 5 provides sufficient rigidity to resist removal of the closure without
deflecting when a torque is
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applied in an attempt to remove the closure from the container without
manipulating the release
element; wherein the child resistant package includes provision for
controlling the deflection of
the release element on the container; and wherein the child resistant package
makes it more likely
that an older adult will fully apply the closure.
In accordance with the invention, a child resistant package includes a
container
having an open end with a single thread' or multiple threads on the external
surface of the
container adjacent the upper end: A closure having a base wall and a
peripheral skirt has an inner
surface formed with single or multiple threads corresponding in number to the
multiple threads
on the container for engaging the threads on the container. A deflectable
release element is
formed integrally on the exterior surface of the container below the threads.
The release element
includes an integral axially deflectable lug' extending upwardly toward the
open end of the
container. The closure has at least one locking lug on the inner surface of
the skirt of the closure
below the threads, the number of locking lugs preferably corresponding in
number to the number
of threads on the closure and container. The deflectable lug on the release
element normally
extends upwardly for engagement with the locking lug on the closure such that
when the
deflectable release element is pressed axially downwardly, the deflectable lug
is disengaged from
engagement with a locking lug, and the closure can be removed by unthreading
the closure from
the container. When the-c'losure is reapplied,. minimal torque is required due
to the axial deflection
of the lug and the locking Iug on the closure moves past the deflectable lug.
2 0 In a preferred form of the child resistant package, the deflectable
release element
includes means thereon which, when deflected, engages means on said container
to limit the
deflection on the deflectable release element in an axial direction: Such
interengaging means
comprises a pair of axial projections on the deflectable release element and a
pair of stops on the
container, which are brought into engagement upon excessive deflection of the
release element.
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,
s a
Aeserintion of the Drawings
Fig. 1 is an elevational view on an enlarged scale of child resistant package
embodying the invention.
Fig. 2 is a fragmentary sectional view taken along the line 2-2 in Fig. 1
showing
the closure on the container.
Fig. 3 is a sectional viewtaken along the line 3-3 in Fig. 1.
Fig. 4 is an elevational view of the closure.
Fig. 5 is a bottom plan view of the closure.
Fig. 6 is an enlarged fragmentary sectional view taken along the line 6-6 in
Fig. 5.
Fig. 7 is a fragmentary perspective view of the container.
Fig. 8 is a bottom view of the container.
Fig. 9 is an enlarged part sectional elevational view of the container.
Fig. 10 is a fragmentary view taken along the line 10-10 in Fig. 9.
Fig. 11 is a fragmentary sectional view on an enlarged scale taken along the
line
11-11 in Fig. 10.
Fig. 12 is a fragmentary sectional view on an enlarged scale taken along the
line
12-12 in Fig. 10.
Fig. 13 is vertical sectional view of a modified form of package:
Fig. 14 is a vertical sectional view of the package shown in Fig. 13 with the
closure
2 0 shown in a non-child resistant mode.
Fig. 15 is a fragmentary view on an enlarged scale of a portion at the circle
15 in
Fig. 13.
Fig. 16 is a fragmentary enlarged view of a portion at the circle 16 in Fig.
14.
Fig. 17 is a perspective view of a modified form of container.
2 5 Fig. 18 is a fragmentary top plan view of the container shown in Fig. 17.
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Fig. 19 is a fragmentary elevational view of the upper part of the container
shown
in Fig. 17
Fig. 20 is a fragmentary bottom plan view of a portion of the container shown
in.
Figs. 18 and 19.
_ Fig. 21 is a fragmentary sectional view taken along the line 21-21 in Fig.
18.
Fig. 22 is a fragmentary sectional view taken along the line 22-22 in Fig, 18:
Fig. 23 is a fragmentary sectional view taken along the line 23-23 in Fig. 18.
Fig. 24 is a fragmentary sectional view on an enlarged scale of a upper
portion of
the container at the circle 24 in Fig. 23.
1 o Fig. 25 is a bottom plan view of a closure utilized with the container
shown in Figs.
17-24.
Fig. 26 is a sectional view taken along the line 26-26 in Fig. 25.
Fig. 27 is a fragmentary sectional view taken along the line 27-27 in Fig. 25.
Fig. 28 is a fragmentary sectional view on an enlarged scale taken along the
line
I S 28-28 in Fig. 25.
Fig. 29 is a fragmentary sectional view on an enlarged scale at the circle 29
in Fig.
26.
Fig. 30 is-a sectional view on an enlarged. scale taken,along the circle 30 in
Fig. 25.
Fig. 31 is a bottom plan view of a modified form of closure.
2 0 Fig. 32 is a fragmentary sectional view taken along the line 32-32 in Fig.
31.
Fig. 33 is a fragmentary sectional view taken along the line 33-33 in Fig. 31.
Fig. 34 is a fragmentary sectional view taken along the line 34-34 in Fig. 31.
Fig. 35 is a perspective view of a further modified form of container.
Fig. 36 is an fragmentary elevational view of the container shown in Fig. 35.
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.,
De~,_r~,~ion of the Preferred Embodii ent
Referring to Figs. i-12, the child resistant package comprises a cylindrical
plastic
container or vial 20 which has a single thread 22 adjacent its upper open end
and a radial flange
24 below the single thread 22. The container 20 is adapted to receive a
plastic closure 26. The
closure 26 is preferably of a reversible type which has a cylindrical portion
28 with an external
thread 30 adapted to engage the internal thread. 32 on the container 20 (Fig.
7) to close- the
container 20 when a non-child resistant mode of use is desirable.
The closure 26 also includes an annular radial flange 34 which forms the base
wall
of the portion 28. An annular peripheral skirt 36 extends axially downwardly
from the radial
flange base wall 34, and is concentric with the portion 28. A single internal
thread 38 is formed
on the internal surface of skirt 36 to engage thread 22 on the container 20.
The closure 26 includes 'a second annular skirt 40 extending axially
downwardly
from the lower end of the skirt 36 and connected thereto by a second annular
radial flange 42 such
that the skirt 40 is radially outwardly spaced from the thread 38:' A single
locking lug or stop 44
extends radially inwardly from the inner surface of skirt 40. (The number of
locking lugs 44
preferably corresponds to the number of threads 22.) Lug or stop 44. includes
a flat radial surface
46 lying at a small acute angle to an axial radial plane preferably not
greater than about 20
degrees, most preferablyabout 10 degrees. Each locking lug.44 also includes a
chamfered surface
45 at the leading end to facilitate clockwise application of the closure 26 as
well as wear on the
2 0 locking lug 44.
The closure 26 may include an axial ring or plug portion 48 concentric with
and
spaced inwardly of skirt 36, and adapted to enter the mouth of the container
20 in spaced relation
to the internal thread 32 when the cap is applied to the container as shown in
Fig. 2. This seals
on the interior of the container.
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.,
A
Referring to Figs. 7 and I0; a deflectable tab or release element 50 is
mounted on
the vial 20 at an interruption or space in the flange 24. The release element
50 is connected to
the vial 20 by circumferentially spaced horizontal flexible and resilient arms
52, which are attached
to the vial 20 at one end and to the release element 50 at the other end such
that the release
element is spaced from the vial. The deflectable release element 50 has a
radial width and axial
thickness that are sufficient to make the element convenient for an adult to
remove the closure
from the container by depressing the element 50, yet di~cult for a child to
open the package. A
single integral cantilever lug 54 extends circumferentially and axially
upwardly from the release
element 50. The cantilever lug 54 is axially deflectable upon the application
of the closure and
is mounted in a cantilever manner on the release element 50. Lug 54 includes
an axial stop
surface 56 that is inclined at a small acute angle to an axial radial plane
complementary to the
angle of surface 46 on locking lug 44, preferably not greater than about 20
degrees, most
preferabiy;about 10 degrees. Preferably, the cantilever lug 54 comprises a
cantilever arm hinged
to the release element 50 by an axial hinge 60 at the juncture of a resilient
arm 52 and release
element 50. Cantilever lug 54 extends circumferentially in the same direction
as the direction of
rotation of closure 26 when it is applied, herein shown as,clockwise when
viewed from the top.
End stop surface 56 is intended to engage surface 46 on the locking lug 44 on
the closure 26.
In clockv~rise application of the closure 26 to the container 20, the inclined
surface
45 on lugs 44 deflects the cantilever lug 54 with a minimum amount of wear on
the locking lug
2 0 44. At the same time, the locking lug 44 remains su~ciently rigid to
resist rotational stripping
torque when any effort is made to remove the closure in the counterclockwise
direction without
deflecting the release element 50 such that there is no downward movement of
the cantilever lug
54. The engagement of inclined surfaces 46, 56 functions to increase the
rotational stripping force
which may be applied to defeat the functioning of the package. When an
increased torque is
2 5 applied by a user in an effort to remove the closure without depressing
the release element 50, the
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engagement of the surfaces 46, 56 forces the free end of the ca~atilever lug
54 into the juncture
of the locking lug 44 with the radial flange 42.
When it is desired to remove the closure 26, the release element 50 responds
to
thumb or finger pressure applied axially of the closure 26 and the container
20 such that the
connecting arms 52 bend and the release element 50 swings radially inwardly
and axially
downwardly to separate the single cantilever lug 54 on the release element SO
out of interlocking
engagement with a stop 44 on the closure 26 as the closure is rotated
counterclockwise for
removal. Preferably, arms ~52 are L-shaped in axial cross section as shown in
Figs. 11 and 12 to
provide controlled deflection.
When it is desired to use the package in anon-child resistant mode, the
closure 26
may be inverted and the external thread 30 on the closure is engaged with the
internal thread 32
on the container.
The plastic container 20 is preferably made of homopolymer polypropylene and
the closure 26 is preferably made of high density polyethylene. Other
container materials which
can be used, depending on the nature of the contents, such as copolymer
polypropylene, other
polyethylenes, and PET. Other closure materials may also be used depending on
the nature of the
contents of the containers.
Figs. 13=30 are directed to a modified form of child resistant package. The
package is substantially the same, corresponding parts being marked with a
suffix "a". In.this
2 0 form, the package includes means for preventing the tab from deflecting
excessively such that it
would be overstressed and exceed he yield point of the plastic material and
potentially create
unacceptable plastic deformation. Fig. 13 shows the assembled package in a
child resistant mode
and Fig: 14 shows the package with the closure in a non-child resistant mode.
Referring to Fig. 17, the container 20a includes positive stop means to
control the
2 5 deflection of loading deflectable release element SOa. This means
comprises a pair of
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circumferentially spaced tab feet 70 and tab stops 72. TabVfeet 70 extend
downwardly axially
from resilient arms 52a and are molded integrally therewith. Tab stops 72
extend axially along
the side wall of vial 20a and are molded integrally thereon. When the closure
26a is fully applied
on the container 20a, the lower ends of tab feet 70 are radially aligned and
spaced radially from
the tab stops 72 (Figs. 13, 14). When the release element 50a is deflected,
the locking lug~54a
is moved out of engagement with'the stop 44a on the closure 26a. However, if
excessive force
is used, the tab feet 70 will engage the tab stops 72 and prevent the movement
of the release
element 50a further than necessary to disengage the cantilever-lug 54a.
This form of child resistant package also differs in that it uses multiple
threads;
.10 hereinshown as double threads 78 on the container instead of a single
thread 22 as in Figs. 1-12.
The closure 26a has complementary double threads 80. In addition, a tapered
flexible surface 82
(Fig. 29) is applied to the axial wall 74 with external threads 30a which
facilitates reversal of the
closure 26a so that it will provide a seal against bead 84 used in a non-child
resistant mode as
shown in Fig. 14. The closure 26a is molded using a mold insert such that
there is no parting line
on the tapered flexible surface 82 such that an improved seal is achieved.
The modified form of closure shown in Figs. 30-34 is similar to that shown in
Figs.
25-29 except that it has a single thread 38a, as in Figs. 1-12.
The stop means described above with respect to Figs. Y 7-34 is also applicable
to
the aforementioned U.S. Patents 4,306,385 and 5,711,442. As shown in Figs. 35
and 36, the rigid
2 0 lug 54b is an integral part of the deflectable release element 50b: The
container 20b includes the
positive stop means to control deflection of the deflectable release element
SOb and includes the
tab feet 70b and tab stops 72b. The container and closure have a single
thread. In all other
respects, the child resistant package may be like the package of the
aforementioned U.S: Patents
4,306,385 and 5,711,442.
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Although,the invention has been described in connection with use on a
container
that comprises a vial, it is applicable to containers wherein the
container'has a threaded finish as .
shown, for example, in U.S. Patents 4,427;124, 4;948;002 and 5,413,233.
It can thus be,seen that there has been provided a child resistant package
which
is consumer friendly; wherein the child resistant package i~ easy to apply and
close; wherein the
child resistant package requires a lesser force or torque when the closure is
rotated to apply the
closure to the container that is substantially less than the torque required
to remove the closure
from the container; wherein the child resistant package minimizes the wear on
a locking lug during
application of the closure to the container; wherein the child resistant
package minimizes the
deflection of the release element on the container when the closure is rotated
to apply the closure
to the container; wherein the child resistant package,has a locking lug which
provides sufficient
rigidity to resist removal of the closure without deflecting when a torque is
applied in an attempt
to remove the closure from the container, without manipulating the release
element; wherein the
child resistant package includes provision for,controlling the deflection of
the release element on
the container; and wherein the child resistant package makes it more likely,
that an older adult will '
fully apply the closure.
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