U.S. patent number 3,841,514 [Application Number 05/332,512] was granted by the patent office on 1974-10-15 for safety closurer.
This patent grant is currently assigned to Sunbeam Plastics Corporation. Invention is credited to Peter P. Gach, Gary B. Montgomery.
United States Patent |
3,841,514 |
Montgomery , et al. |
October 15, 1974 |
SAFETY CLOSURER
Abstract
A safety package consisting of a one piece cap and a container
having co-operating elements which make the closure significantly
difficult of removal by a small child. The cap has a top and an
internally threaded inner wall which mates with threads on the
container neck. The cap also has an outer spaced, concentric
flexible skirt. The shoulder of the container near the threaded
neck has one or more recesses and the outer skirt of the closure
has a corresponding number of depending lugs. Each lug snaps into a
recess when the cap is threaded onto the neck to a sealed position.
Inward deformation of the outer skirt is necessary to flex the
skirt to move each lug radially outwardly beyond its recess in
order for the cap to be removed. Cooperating means on the cap and
container prevent the cap from being threaded onto the neck beyond
the normally sealed position.
Inventors: |
Montgomery; Gary B.
(Evansville, IN), Gach; Peter P. (Evansville, IN) |
Assignee: |
Sunbeam Plastics Corporation
(Evansville, IN)
|
Family
ID: |
23298553 |
Appl.
No.: |
05/332,512 |
Filed: |
February 14, 1973 |
Current U.S.
Class: |
215/216;
215/329 |
Current CPC
Class: |
B65D
50/046 (20130101) |
Current International
Class: |
B65D
50/00 (20060101); B65D 50/04 (20060101); B65d
055/02 () |
Field of
Search: |
;215/9,43R,43A,40,44 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Hall; George T.
Attorney, Agent or Firm: Leonard; Henry K.
Claims
What we claim is:
1. A safety package comprising a container and a cap, said
container having a bottom, a sidewall, a neck and an annular
shoulder extending between said neck and said sidewall, and at
least one lug recess in said shoulder, said cap having a top, an
inner wall depending from said top, cooperating threads on said
container neck and said inner wall for retaining said cap in
sealing position on said container, a liner on the underside of
said cap top, an outer skirt depending from said top in concentric
relationship to said inner wall, and at least one depending lug on
said outer wall having a lower portion extending below the bottom
of said inner wall that is adapted for engagement in said recess
when said cap is turned to sealing position, the trailing side of
said lug engaging the back wall of such recess to prevent said cap
being unscrewed off of said neck, and cooperating means on said cap
and said container for preventing the rotation of said cap onto
said container neck beyond such sealing position.
2. A safety package according to claim 1 in which the container is
a glass bottle having an axial mold parting plane and the back wall
of the recess lies in such plane.
3. A safety package according to claim 1, and camming means
comprisng a container camming surface on said shoulder whereby when
said cap is moved downwardly, said lug engages said camming means
and is urged outwardly.
4. A safety package according to claim 3, wherein said cap includes
two opposed lugs depending from said skirt and said container
shoulder has two opposed recesses.
5. A safety package according to claim 1, wherein said cooperating
means consists of blind end threads on said neck and on said inner
wall so positioned as to be engaged when said lug enters said
recess.
6. A combination safety package comprising a container and a
unitary screw-on cap, said container having a bottom, a cylindrical
sidewall, a threaded neck and a shoulder extending between said
threaded neck and said sidewall, said container shoulder having at
least one lug recess, said screw-on cap having a top, a downwardly
extending threaded inner wall for mating with said threaded neck of
said container, a sealing liner within said inner wall, and an
outer, spaced, concentric, resilient skirt depending from said top,
said skirt extending below said inner wall, said skirt having at
least one downwardly extending locking lug, said lug overlying and
being in an engageable relationship with said container shoulder
and engageable in said lug recess when said cap is screwed onto
said container to sealing position and cooperating means on said
cap and said container for stopping the rotation of said cap onto
said container neck when said lug engages in said lug recess.
7. The safety package of claim 6 wherein said cooperating means
consists of a stop on the threads on said threaded inner wall.
8. The safety package of claim 6 wherein said cooperating means
consists of a lip on said recess engaged by the leading edge of
said lug after said lug engages in said recess.
9. The safety package of claim 6 wherein said container has a pair
of circumferentially spaced lug recesses, and wherein said outer
concentric skirt has a pair of similarly spaced lugs complementary
to said recesses, for releasably locking said cap to said
container.
10. A safety package combination as in claim 9 and oppositely
located arcuate slots in said cap top between the upper ends of
said inner wall and said outer skirt and located above said lugs,
whereby inward displacement of the lower portion of said outer
skirt intermediate said lugs is facilitated and said lugs are
radially outwardly displaced by flexure of the upper edge of said
outer skirt adjacent such slots.
Description
BACKGROUND OF THE INVENTION
Many so-called childproof closures for medicine bottles and the
like have been designed and many combinations of closures and
container neck configurations have been suggested in the past in
order to make it difficult for a small child to remove the cap from
such a package and thus to gain access to harmful or dangerous
contents of the package.
Many of these previously suggested childproof closures have been
complex and expensive, many consisting of at least two cooperating
parts and thus requiring assembly prior to placement on a
container. Others have required special capping equipment in order
to place the caps or closures on the bottles or other containers,
again increasing the cost of manufacture and thus the cost to the
packager.
The principal object of the instant invention to provide a safety
package comprising a one-piece cap and a bottle or other container
having a threaded neck, the cap and the bottle having cooperating
means which function to prevent removal of the cap but which allow
the cap to be put on the bottle by the use of conventional capping
equipment.
A further object of the instant invention is to provide a one-piece
safety closure for a bottle or other container having a threaded
neck which not only has cooperating means to prevent the closure
from being removed from the container by a small child, but also
comprises means to prevent the closure from being screwed onto the
neck of the bottle or container beyond its normal sealing distance
thus to prevent injurious compression of the sealing liner in the
cap so that the package will continue to function adequately for
containing liquid materials.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a fragmentary view partially in elevation and with parts
broken away showing a safety package embodying the invention and
comprising a closure and a glass bottle;
FIG. 2 is a fragmentary view, partly in plan and partly in section
taken along the line 2--2 of FIG. 1;
FIG. 3 is a horizontal sectional view taken along the line 3--3 of
FIG. 1;
FIG. 4 is a vertical sectional view of a cap embodying the
invention as provided with means for preventing the cap to be
screwed too tightly onto the neck of a container;
FIG. 5 is a top plan view of a container neck as provided with a
modified form of means for preventing the cap from being screwed
too tightly onto the container;
FIG. 6 is a top plan view of a cap according to the invention also
embodying an improved construction by which the overall external
diameter of the cap may be minimized, and shown in a smaller scale
than that utilized in FIGS. 1-5, inclusive; and
FIG. 7 is a fragmentary view in elevation, with parts broken away,
of the cap illustrated in FIG. 6 as it is utilized on the neck of a
bottle according to the invention.
DESCRIPTION OF PREFERRED EMBODIMENTS
A safety package embodying the invention as illustrated in FIG. 1
consists of a one piece cap 10 and a container 11 illustrated as a
bottle. The cap 10 has a top 12, an internally threaded inner wall
13 and an outer concentric skirt 14. The threads on the inner side
of the inner wall 13 mate with threads 15 on a neck 16 of the
container 11.
Cooperating locking means in this embodiment of the invention
consists of a pair of diametrically opposed, depending lugs 17 on
the lower margin of the skirt 14 and cooperating lug recesses 18
formed in a bevelled shoulder 19 of the container 11.
In this embodiment of the invention, the back edges of the recesses
18 lie in an axial plane in which a parting line, generally
indicated by the reference number 20, also lies. This arrangement
of co-planar alignment of the back edges of the recesses 18 with
the mold parting line of a container 11 is important in glass
bottles designed according to the invention and is helpful in
blow-molded plastic bottles. Such an alignment of the locking edges
of the recesses 18 and the parting plane of the mold for a glass
bottle 11 is easy to arrange and facilitates manufacture.
Engagement of threads 21 on the inner surface of the inner wall 13
with the threads 15 on the neck 16 of the container 11 provides for
the placement of the cap 10 on the container 11 by automatic
capping machinery having a conventional chuck which has a torsion
clutch so that the cap 10 is rotated downwardly onto the neck 16 of
the container 11 in the usual fashion until the locking lugs 17
engage the bevelled shoulder 19 and rotate sufficiently to drop
into the respective recesses 18. A resilient liner 22 positioned on
the underside of the cap top 12 at this point, also engages tightly
against the upper end of the neck 16 to seal the neck against the
escape of liquid material.
The cap 10 cannot now be removed from the container 11 without
distorting the cap 10 by pressing inwardly on its opposite sides at
midpoints around it circumference between two locking lugs 17,
i.e., in the direction indicated by the arrows labeled "Press" in
FIG. 2, to flex the outer skirt 14 distorting it from circular and
moving the locking lugs 17 radially outwardly to the positions
shown in broken lines in FIG. 2 and indicated by the reference
numbers 17a. After thus squeezing inwardly on opposite sides of the
outer skirt 14 and flexing the locking lugs 17 outwardly, the cap
10 may then be removed by rotating it in a counter-clockwise
direction.
Distortion is also illustrated in FIG. 3 where the locking lugs 17
are shown in solid lines in their normal, locked position and
illustrated in broken lines indicated by the reference numbers 17a
in their outwardly flexed position.
The embodiment of the invention illustrated in FIGS. 1, 2, 3 and 4
also includes cooperating means which function to prevent the cap
10 from being screwed onto the neck 16 beyond its normal sealing
position with the lugs 17 engaged in the recesses 18. In this
embodiment of the invention these cooperating means comprise blind
ends 23 on the threads 21 of the cap 10 and blind ends 24 on the
cooperating threads 15 of the neck 16. It will also be observed in
FIGS. 1, 2, and 4 that the blind end 23 on the cap thread 21 and
the cooperating blind end 24 on the neck thread 15 lie in a radial
plane positioned angularly only a degree or so beyond the radial
plane of the parting line and the walls of the recesses 18.
When the cap 10 is threaded onto the neck 16 the lugs 17 first
engage the bevelled shoulder 19 and are flexed outwardly and then
snap into the recesses 18 when the cap 10 reaches its normal
sealing position. Immediately after the lugs 17 snap inwardly into
their respective recesses 18, the blind ends 23 and 24 of the
respective threads on the cap 10 and neck 16 engage each other,
thereby preventing further clockwise rotation of the cap 10 onto
the neck 16 and preventing excessive damage to the liner 22.
In the embodiment of the invention partially illustrated in FIG. 5,
a container 25 has a threaded neck 26 and a bevelled shoulder 27
which is provided with two opposed lug recesses 28. In this
embodiment of the invention, the recesses 28 have two parallel
sides, i.e., a back wall 29 and a front wall 30. When a cap 10
having lugs 17 is threaded onto the neck 26, the lugs 17 engage the
shoulder 27 and are flexed outwardly and then snap into the
respective recesses 28 with their trailing edges adjacent the back
recess walls 29. Similarly, the front edges of the lugs 17 are
adjacent the front walls 30 of the recesses 28 thereby preventing
the cap 10 from being threaded onto the neck 26 any more than a
degree or so beyond its normal sealing position.
The embodiment of the invention illustrated in FIGS. 6 and 7
illustrates a further modification which is desirable when a large
size cap is to be employed with a large container neck. Of course,
this improvement may also be utilized in a smaller sized cap if
desired.
In the embodiment of the invention illustrated in FIGS. 6 and 7, a
pair of oppositely located arcuate slots 31 are formed in a cap top
32 between the upper ends of an outer flexible skirt 33 and an
inner threaded wall 34. In this embodiment cooperating lugs 35 and
lug recesses 36 prevent opening of the package without distortion
of the flexible skirt 14.
When the outer skirt 33 is distorted in order to open the package,
by squeezing inwardly at the points intermediate the two lugs 35,
the relief provided by the slots 31 allows the skirt 33 to flex to
a greater degree than is possible when the top 32 is uninterrupted
across its entire upper surface. Such excessive flexing is
illustrated in FIG. 7 with the upper edge of the outer skirt 35
being shown as distorted or flexed upwardly, thus providing for a
greater distance of outward movement of the lugs 35 without
requiring as much annular space to exist between the inner surface
of the flexible skirt 33 and the outer surface of the relatively
stiffer, inner threaded wall 34.
This invention consists of an improvement on the disclosure in Gach
et al. co-pending application, Ser. No. 278,101 filed Aug. 4, 1972
to which reference is hereby made for illustration of modifications
to which the invention of the instant application readily may be
applied.
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