U.S. patent number 3,917,096 [Application Number 04/715,391] was granted by the patent office on 1975-11-04 for safety package.
This patent grant is currently assigned to Reflex Corporation of Canada Limited. Invention is credited to Peter Hedgewick.
United States Patent |
3,917,096 |
Hedgewick |
November 4, 1975 |
Safety package
Abstract
The container disclosed herein comprises a cylindrical plastic
body which is molded in one piece and has circumferentially spaced
radially extending projections on the upper end thereof that have
notches therein. The cap comprises a one-piece plastic body having
a base and a peripheral flange with circumferentially spaced lugs
extending radially inwardly for engagement with the notches. An
annular integral flexible web is provided on the inner surface of
the base and extends downwardly and outwardly. An annular integral
rib on the inner surface of the base overlies the annular flexible
web and serves as a stop to prevent overflexing of the web. The cap
is applied to the container by a rotating movement. The cap can
only be removed from the container by applying an axial force on
the periphery of the cap and thereafter rotating the cap.
Inventors: |
Hedgewick; Peter (Windsor,
CA) |
Assignee: |
Reflex Corporation of Canada
Limited (Windsor, CA)
|
Family
ID: |
24873837 |
Appl.
No.: |
04/715,391 |
Filed: |
March 22, 1968 |
Current U.S.
Class: |
215/211;
215/222 |
Current CPC
Class: |
B65D
41/06 (20130101) |
Current International
Class: |
B65D
41/06 (20060101); B65D 41/04 (20060101); B65d
055/02 () |
Field of
Search: |
;215/9,40,44,DIG.1
;220/4S,40 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
1,213,812 |
|
Nov 1959 |
|
FR |
|
1,378,226 |
|
Oct 1964 |
|
FR |
|
878,606 |
|
Jun 1953 |
|
DT |
|
1,107,541 |
|
May 1961 |
|
DT |
|
Primary Examiner: Norton; Donald F.
Attorney, Agent or Firm: Reising, Ethington, Barnard, Perry
& Brooks
Claims
I claim:
1. A one-piece, molded plastic safety cap of the type adapted to be
applied to and removed from a container by axial motion followed
successively by rotative motion relative to the container, said cap
comprising: a base; a peripheral flange extending axially from said
base for receiving the mouth of a container; a resilient flexible
member surrounded by said flange having an inner annular end molded
integrally to said base and extending axially therefrom and
terminating in an outer annular free end, said free end being
engageable with a container when the cap is mounted thereon; and a
plurality of radially inwardly projecting locking lugs on the inner
surface of said flange for engaging locking means on the mouth of a
container received in the flange, said locking lugs having upwardly
and radially outwardly extending surfaces.
2. A one-piece molded plastic safety cap as claimed in claim 1
wherein said upper surfaces of said locking lugs are curved
concavely upwardly and outwardly from the upper edge of the inner
surface thereof to merge with the inner surface of the flange.
3. A one-piece molded plastic safety cap as claimed in claim 2
wherein the upper surface of each of said locking lugs lies in a
plane inclined upwardly from the upper edge of the inner surface of
the lug to the inner surface of the flange.
4. A one-piece molded plastic safety cap as claimed in claim 1
wherein the diameter of the inner annular end of said resilient
member is less than the diameter of the outer annular free end such
that the resilient flexible member extends axially and radially
outwardly from said base.
5. A one-piece molded plastic safety cap as claimed in claim 1
wherein the diameter of the inner annular end of said resilient
flexible member is greater than the diameter of the outer annular
free end such that the resilient flexible member extends axially
and radially inwardly from said base.
6. A one-piece molded plastic safety cap as claimed in claim 1
wherein the diameter of the inner annular end of said resilient
flexible member is the same as the diameter of the outer annular
free end.
7. A one-piece molded plastic safety cap as claimed in claim 6
wherein said resilient flexible member is cylindrical.
8. A one-piece molded plastic safety cap as claimed in claim 7
wherein the outer annular free end of said resilient flexible
member is tapered downwardly and outwardly from the inner surface
of the resilient flexible member to the outer surface thereof.
9. A one-piece molded plastic safety cap as claimed in claim 7
wherein the outer annular free end of said resilient flexible
member is tapered downwardly and inwardly from the outer surface of
said resilient flexible member to the inner surface thereof.
10. A safety package for medicines and the like comprising: a
container having a mouth portion with an annular rim; a one-piece
molded plastic cap having a base with an integral peripheral flange
projecting axially therefrom for receiving the mouth portion of
said container; interengageable locking elements on the inner wall
of the flange of the cap and the outer wall of the mouth of the
container, the cap locking elements being engageable with and
disengageable from the container locking elements by combined axial
and rotative motion of the cap relative to the container; said cap
locking elements and container locking elements being formed with
complementary upwardly and radially outwardly extending mating
surfaces; and a resilient flexible member on said cap having an
inner annular end joined integrally to said base and extending
axially therefrom and terminating in an outer annular free end;
said outer annular free end being engageable with the container to
bias the cap and container apart when the locking elements are
engaged.
11. A safety package as claimed in claim 10 wherein the cap locking
elements comprise a plurality of radially inwardly projecting
locking lugs on the inner surface of said flange, and the container
locking elements comprise a plurality of notches on the outer wall
of the mouth of the container engageable by the locking lugs.
12. A safety package as claimed in claim 11 wherein said
complementary upwardly and radially outwardly extending mating
surfaces are defined by said locking lugs being curved concavely
upwardly and outwardly to merge with the inner surface of the
flange and the notch being complementarily, convexly curved
upwardly and outwardly from the upper inner edge of the notch.
13. A safety package as claimed in claim 11 wherein said
complementary upwardly and radially outwardly extending mating
surfaces are defined by each of said locking lugs having a surface
lying in a plane inclined upwardly and outwardly to the inner
surface of the flange, and the notch being complementarily inclined
upwardly and outwardly from the upper inner edge of the notch.
14. A safety package as claimed in claim 11 wherein the diameter of
the inner annular end of said resilient flexible member is less
than the diameter of the outer annular free end such that the
resilient flexible member extends axially and radially outwardly
from said base.
15. A safety package as claimed in claim 14 wherein the wall of
said resilient flexible member has a portion of reduced thickness
intermediate the inner annular end and the outer annular free
end.
16. A safety package as claimed in claim 11 wherein the diameter of
the inner annular end of said resilient flexible member is greater
than the diameter of the outer annular free end such that the
resilient flexible member extends axially and radially inwardly
from said base.
17. A safety package as claimed in claim 16 wherein the outer
surface of said resilient flexible member engages the inner edge of
said annular rim when the locking elements are engaged.
18. A safety package as claimed in claim 11 wherein the diameter of
the inner annular end of said resilient flexible member is the same
as the diameter of the outer annular free end.
19. A safety package as claimed in claim 18 wherein said resilient
flexible member has a uniform cross section from the inner annular
end to the outer annular free end.
20. A safety package as claimed in claim 19 wherein the outer
annular free end of said resilient flexible member is tapered
downwardly and inwardly from the outer surface of the resilient
flexible member to the inner surface thereof, and the container rim
has a complementary downwardly and inwardly tapered surface
engageable thereby when the locking elements are engaged.
21. A safety package as claimed in claim 28 wherein the outer
annular free end of said resilient flexible member is tapered
downwardly and outwardly from the inner surface of the resilient
flexible member to the outer surface thereof, and the inner surface
of the mouth of the container is formed with an annular groove,
said groove having a complementary surface tapered downwardly and
outwardly from the inner wall of the mouth of the container
engageable by the tapered surface of said outer annular free
end.
22. A safety package comprising: a container having a mouth portion
with an annular rim; a one-piece cap having a base with a
peripheral flange projecting axially therefrom for receiving said
mouth portion; interengageable locking elements on the outer wall
of the mouth of the container and inner wall of the flange of the
cap, the cap locking elements being spaced peripherally from each
other and engageable with and disengageable from the container
locking elements by combined axial and rotative motion of the cap
relative to the container; a resilient flexible member formed on
the base of the cap having an inner annular end joined integrally
to the base of the cap and extending axially therefrom and
terminating in an outer annular free end, said inner annular end at
the juncture with the base having a diameter at least as large as
that of the outer annular free end, said outer annular free end
being engageable with the container to exert a biasing force in an
axial direction between the cap and container when the locking
elements are engaged; wherein the diameter of said inner annular
end is greater than the diameter of the outer annular free end in
the unstressed condition of the resilient flexible member such that
the resilient flexible member extends axially and radially inwardly
from the base.
23. A safety package as claimed in claim 22 wherein the outer
surface of the resilient flexible member engages the inner edge of
said annular rim.
24. A safety package comprising: a container having a mouth portion
with an annular rim; a one-piece cap having a base with a
peripheral flange projecting axially therefrom for receiving said
mouth portion; interengageable locking elements on the outer wall
of the mouth of the container and inner wall of the flange of the
cap, the cap locking elements being spaced peripherally from each
other and engageable with and disengageable from the container
locking elements by combined axial and rotative motion of the cap
relative to the container; a resilient flexible member formed on
the base of the cap having an inner annular end joined integrally
to the base of the cap and extending axially therefrom and
terminating in an outer annular free end, said inner annular end at
the juncture with the base having a diameter at least as large as
that of the outer annular free end, said outer annular free end
being engageable with the container to exert a biasing force in an
axial direction between the cap and container when the locking
elements are engaged; wherein the diameter of said inner annular
end is the same as the diameter of said outer annular free end and
said resilient flexible member is cylindrical: and wherein the
outer annular free end of said resilient flexible member is tapered
downwardly and outwardly from the inner surface of the resilient
flexible member to the outer surface thereof, and the inner surface
of the mouth of the container is formed with an annular groove,
said groove having a complementary surface tapered downwardly and
outwardly from the inner wall of the mouth of the container
engageable by the tapered surface of said outer annular free
end.
25. A one-piece molded plastic safety cap of the type adapted to be
applied to and removed from a container by axial motion followed
successively by rotative motioin relative to such container, said
cap comprising: a base, a peripheral flange extending axially from
said base for receiving the mouth fo a container; a plurality of
peripherally spaced locking elements projecting from the inner
surface of said flange; a resilient flexible member surrounded by
said flange having an inner annular end molded to one of said
flange and base and extending axially from said base and
terminating in an outer annular free end, the diameter of said
inner annular end being greater than the diameter of the outer
annular free end in the unstressed condition of said resilient
flexible member, said outer annular free end being engageable with
a container when the cap is mounted thereon; and said flexible
member comprising means for exerting an axial biasing force between
the cap and container.
26. A one-piece molded plastic safety cap as claimed in claim 25
further including an integral annular stop member on the base of
the cap projecting axially therefrom for engagement with the
resilient flexible member to limit flexing of said resilient
flexible member.
27. A one-piece molded plastic safety cap as claimed in claim 26
wherein the diameter of said inner annular end is greater than the
diameter of said stop member.
28. A one-piece molded plastic safety cap of the type adapted to be
applied to and removed from a container by axial motion followed
successively by rotative motion relative to such container, said
cap comprising: a base; a peripheral flange extending axially from
said base for receiving the mouth of a container; a plurality of
peripherally spaced locking elements on the inner surface of said
flange; a resilient flexible member surrounded by said flange
having an inner annular end molded to one of said flange and base
and extending axially from said base and terminating in an outer
annular free end, said inner annular end being molded to said base
and the diameter of the inner annular end of said resilient
flexible member being substantially the same as the diameter of the
outer annular free end wherein said resilient flexible member is
cylindrical; the outer annular free end of said resilient flexible
member being tapered downwardly and outwardly from the inner
surface of the resilient flexible member to the outer surface
thereof, and said outer annular free end being engageable with a
container when the cap is mounted thereon, said flexible member
comprising means for exerting an axial biasing force between the
cap and container.
Description
BACKGROUND OF THE INVENTION
This invention relates to safety caps and containers.
In the patent to Hedgewick U.S. Pat. No. 3,344,942, issued Oct. 3,
1967 there is disclosed and claimed a novel cap and container
structure which cannot be readily opened by children, which is
relatively simple and inexpensive and wherein the cap and container
can each be molded in one piece.
The cap of the Hedgewick patent incorporates circumferentially
spaced axial openings that overlie lugs on the cap that are adapted
to engage notches on the container. The axially spaced openings
make it possible to produce the cap in one piece.
Among the objects of the present invention are to provide a cap and
container construction which is similar to that shown in the
Hedgewick U.S. Pat. No. 3,344,942 but can be made in a mold in one
piece without the use of circumferentially spaced openings
overlying the lugs.
Among the objects of the present invention are to provide a cap and
container construction which is similar to that shown in the
Hedgewick U.S. Pat. No. 3,344,942 but in addition produces a
moisture and vapor-tight seal.
In the drawings:
FIG. 1 is a fragmentary vertical sectional view of a cap and
container embodying the invention.
FIG. 2 is a fragmentary vertical sectional view of a modified form
of cap and container.
FIG. 3 is a fragmentary vertical sectional view of a further
modified form of cap and container.
FIG. 4 is a fragmentary vertical sectional view of a further
modified form of cap and container.
FIG. 5 is a vertical sectional view similar to FIG. 4 showing the
relative positions of the cap and container as the cap is being
removed from the container.
FIG. 6 is a plan view of the container.
FIG. 7 is a side elevational view of the container.
FIG. 8 is a fragmentary side elevational view of the upper portion
of the upper end of the container shown in FIG. 4.
Referring to FIG. 1, the invention comprises a cap 10 that is
adapted to be applied to the upper end of a container C, each of
which is molded by injecting plastic into a cavity.
As shown in FIG. 1, the cap 10 includes a base 11 and a peripheral
flange 12 extending axially of the axis of the cap. A plurality of
radially inwardly extending lugs or locking elements 13 are
provided on the inner surface 14 of the flange 12 adjacent the
lower end thereof. An integral flexible resilient annular
projection or web 15 extends generally axially and radially
outwardly from adjacent the periphery of the inner surface 16 of
the base 11 and is formed with an enlarged rib 17 on the free end
thereof that is adapted to engage the upper end or rim of the
container C. The web 15 has a lesser cross section intermediate its
ends so that it will flex intermediate its ends upon application of
an axial force. An integral annular rib 18 extends axially from the
inner surface 16 of the base 11 in generally overlying relation to
the free end of the web 15.
The upper surface 13a of each lug 13 extends upwardly and outwardly
at an angle to the horizontal and as shown is slightly concave.
Such a construction permits the cap 10 to be molded in one piece in
a mold and then stripped or snapped off the mold while the plastic
is still hot. The angle which the surface forms with the horizontal
preferably ranges between 5.degree. and 45.degree..
The container C is generally cylindrical at least at the upper end
or mouth portion and preferably throughout so that it can be made
in a single cavity one-piece mold. The container C is formed at its
upper end with a plurality of outwardly extending radial
projections or locking elements 19. As shown in FIG. 8, each radial
projection 19 is formed with a first portion 20 and a
circumferentially spaced second portion 21 to define a notch 22.
The lower surface 23 of the first portion 20 is tapered gradually
downwardly and circumferentially to blend in a smooth curve with
the side wall 24 of the notch 22. The second portion 21 extends
axially a greater distance from the upper end of the container to
define the side 25 of the notch 22.
The lower surface 22a of each notch 22 is formed with an upwardly
and outwardly extending surface that is complementary to the
surface of the lug 13, that is, forms the same angle with the
horizontal.
In order to assemble the cap 10 on the container C, the cap is
applied to the upper end of the container. The cap is then rotated
to bring the lugs 13 into engagement with the tapered surfaces 23
of the projections 19. Further rotation of the cap causes the lugs
to follow the surfaces 23 producing a flexing of the web 15
intermediate its free edge and its base until the lugs engage the
notches 22. In this position, the cap 10 is locked on the container
C by the spring force of the web 15 and the bead 17 of the web 15
is in sealing engagement with the upper surface of the container C
as shown in FIG. 1. The base 11 of the cap 10 is of such a
thickness that it will flex if a force is applied at the center of
the base 11. The area of juncture of the base of the web 15 and the
base 11 of the cap substantially overlies the upper end of the
container.
The cap cannot be removed by a simple rotation so that children are
deterred, if not prevented, from removing the cap. In order to
remove the cap, an axial force must be provided on the periphery of
the cap in the direction of the arrow as shown in FIG. 1 to cause a
flexing of the web 15 and permit the lugs 13 to move axially and
thereby clear the portion 20 of the projections. After this axial
force is applied, the cap can be turned in the direction of the
arrow shown in FIG. 1 to permit its removal. Because of the
flexible nature of the base 11 of the cap, the axial force must be
provided on the periphery of the cap and not at the center of the
cap. This force is most conveniently applied by pressing the
container against the palm of the hand. In both applying and
removing the cap, the rib 18 prevents overflexing of the web 15
beyond the elastic limit which might cause a loss of resiliency or
spring action of the web. In applying the cap, the greater axial
extent of the portion 21 prevents turning the cap beyond the notch
22. In removing the cap, the greater axial extent of the portion 21
prevents rotating the cap in the wrong direction for removal.
The cap 10 is made of a suitable plastic material which provides
the desired flexibility of the integral web 15. A preferred
material comprises polypropylene although other materials such as
polyethylene can be used. The container C is also preferably made
of a plastic. A preferred plastic material comprises a high impact
styrene.
In the form of the invention shown in FIG. 2, the annular flexible
web 26 is of substantially uniform thickness and extends downwardly
and inwardly from the inner surface of the base of the cap
exteriorly of the stop 18. In this form, the lower edge of the
annular web extends into the open upper end of the container and
the outer surface 27 thereof engages the inner edge 28 of the upper
end of the container. In addition, in this form, the upper surface
13b of each lug 13' is straight and extends upwardly and outwardly
and the notch 22' has a complementary surface 22b.
In the form of the invention shown in FIG. 3, the annular flexible
projection 29 extends substantially axially downwardly from the
inner surface of the base of the cap and has an inwardly tapered
lower surface 30 that engages a complementary tapered lower surface
31 on the upper end of the container. In this form, the surfaces of
each lug' and notch 22' are similar to the form of the invention
shown in FIG. 2.
In the form of the invention shown in FIGS. 4 and 5, the annular
web 32 extends axially downwardly from the inner surface of the
base of the cap and has an outwardly inclined lower edge 33 which
engages an annular V-shaped shoulder or groove 34 on the upper end
of the container. As shown in FIG. 5, when the cap is depressed by
applying force to the outer edge thereof, the web flexes inwardly
intermediate its ends inwardly to permit movement of the cap
sufficiently to cause the lugs 13' to clear the notches 22'.
* * * * *