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Патент USA US3023949

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March 6, 1962
H. A. GUSTAFSON
3,023,939
DISPENSING CLOSURES
Filed March 16, 1.959
32
E6. 1.
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5'6
50
/2
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4Q
25
35
ATTORNEY
Unite States atent O??ce
3,623,939
Patented Mar. 6, 1962
1
3,023,939
DISPENSING CLOSURES
Henry A. Gustafson, Boston, Mass, assignor to
Clifford R. Jennings, Brockton, Mass.
Filed Mar. 16, 1959, Ser. No. 799,658
6 Ciaims. (Cl. 222-536)
2
FIG. 3, showing the formation of a seal within a dispens
ing closure of this invention;
FIG. 5 is a perspective view of a modi?ed dispensing
closure of this invention;
FIG. 6 is a partial cross-sectional view taken at line
6—6 of FIG. 5 ;
I
FIG. 7 is a partial cross-sectional View, similar to FIG.
6 of a further modi?ed dispensing closure of this inven
This invention relates to new and improved dispensing
closures.
tion;
Two-part or two-piece dispensing closures in which the 10 FIG. 8 is a partial cross-sectional view, similar to FIG.
individual parts or pieces are manufactured out of thermo
6 of a still further modi?ed dispensing closure of this
plastic materials such as polyethylene are commonly be
invention; and
ing used at the present time for a wide variety of pur
FIG. 9 is a partial cross-sectional view taken at line
poses. Such closures diifer from a number of prior related
9——9 of FIG. 8.
devices in that they are formed in such a manner that the 15
It is to be understood that the dispensing closures shown
individual parts used in them can be easily assembled to
in the accompanying drawings are presently preferred em
gether by a simple snapping type of operation. Because
bodiments or forms of this invention. However, a num
of this and because these individual parts or pieces may
ber of differently appearing dispensing closures may be
be easily and cheaply manufactured using high-speed in?
easily manufactured utilizing the basic features or prin
jection molding techniques, the use of these modern dis 20 ciples of this invention.
pensing closures is advantageous commercially.
Unfortunately with modern two~part dispensing closures
In essentially summary form it can be stated that this
invention is built about the use of a ?exible, resilient seal
there is a decided problem with respect to leakage. To
a large extent this problem is related to the fact that it
ing ring in a two-part dispensing closure, the parts of which
may be snapped together. In this type of dispensing clo
is impossible to adequately control modern injection mold 25 sure the ?rst part, usually, but not necessarily, a common
ing techniques so that precise reproduction of part dimen
bottle cap, is formed so as to hold a second part. This
sions is achieved. Because of this latter factor virtually
second part is rotatably mounted on the ?rst part so that
every large group of dispensing closures of the type in
a surface of revolution on it may be brought in contact
dicated in the preceding paragraph contains a commercial
with a ?exible, resilient sealing ring located on the ?rst
ly disadvantageous number of defective units.
30 part. This sealing ring surrounds an opening leading
In order to remedy the problem of leakage in these
through the ?rst part and serves to maintain a seal between
modern closures it has been proposed to use a number of
different types of structures. With the various types of
structures it has previously been considered necessary to
the ?rst and second parts around this opening at all times.
In the accompanying drawing there is shown a dispens
ing closure it) built in the form of a common bottle cap
exert a comparatively large amount of pressure in the area 35 such as may be used with cosmetics or the like. This clo
sure includes a first part 12 which consists of a top 14 and
in which a seal is desired. This type of approach to the
problem of leakage is disadvantageous commercially be
cause of the fact that surfaces produced by injection mold
ing techniques will frequently contain a minute amount of
surface irregularity su?icient to prevent a satisfactory seal
being formed. This type of approach to the problem of
defective closures is also disadvantageous because it re
sults in a comparatively high amount of friction tending
to oppose the opening or closing of these closures. It is
normally desired to have a dispensing closure which may
be easily and conveniently opened or closed with a mini
mum or nominal amount of force.
a dependent internally threaded skirt 16 which is formed
integrally with the top 14. With the invention the ?rst
part 12 is formed of a somewhat resilient, ?exible mate
rial, such as common polyethylene. The part 12 may be
easily formed of this material by common, high speed
injection molding techniques. The ?rst part 12 may, if
desired, be formed as an integral part of a container, or
may be formed in a known manner so that the skirt 16
may be snapped into place or popped into place.
The shape of the top 14 is considered to be important
with this invention. As it is shown it has a slot 18 located
therein having a cylindrical end 20. From the bottom of
new and improved dispensing closures which can be manu
this end 29 there extends an opening 22 leading through
factured on a mass production basis without any substan
the top 14 into the interior of the skirt 16. Around this
50
tial or material danger of creating defective devices. A
opening 22 there is formed an O-ring type of sealing ring
more speci?c object of this invention is to provide dispens
24- which is spaced from the opening 22. This sealing
ing closures in which at least one of the parts is formed
ring 24 has a uniform cross-sectional con?guration and
A broad object of the present invention is to provide
by known injection molding techniques out of a thermo
plastic material such as polyethylene having resilient,
a rounded upper edge which in cross section has the ex
ternal shape of half of a circle. The edge of the ring 24
55
?exible properties and in which this part is formed so as
remote from this end 20 is located in the locus of a cylin
to include a resilient, ?exible sealing ring. A still further
object of the present invention is to provide two-part dis
pensing closures in which the individual parts may be
tion, having an axis of curvature coinciding-with the axis
Further objects and advantages of this invention will be
of the end 20.
At the sides of the end 20 of the slot 18 there are
easily snapped together.
apparent to those skilled in the art to which the invention
pertains from a detailed consideration of the remainder of
this description including the appended claims and the ac
companying drawing in which:
der having the same axis as the axis of the cylindrical
end 20. Thus, the ring 24 extends in ‘a surface of revolu
located within the top 14 aligned cylindrical bearing
openings 26, each of which has a slot 28 extending along
its entire length. This construction is provided so that a
second part 30 employed with the invention may be
FIG. 1 is a perspective view of a dispensing closure 65 snapped into place on the ?rst part 12 so as to be capable
of this invention;
FIG. 2 is an exploded view showing the parts of this
closure;
FIG. 3 is a partial cross-sectional view of a ?rst part of
of rotation with respect to the ?rst part. This second part
33 is preferably formed of a material such as common
polyethylene as indicated above because such a material
70 is capable of deforming slightly in forming a seal; how'
this closure taken at line 3—3 of FIG. 2;
ever, it may be formed of other more rigid materials.
FIG. 4 is a partial cross-sectional view corresponding to
The second part 30 includes aligned axles 32 which can
speasse
3
be located within the bearing ‘openings 26 by being pushed
4
within the end 60 so that aligned bearing openings 70
corresponding in shape to the trunnions 62 ?t over these
through the slots 28. As this is done the portions of
the top 14 de?ning the ‘bearing openings 26 are, of course,
temporarily deformed for a short period.
trunnions in order to rotatably mount the second part 68
Between the axles 32 there is located a center member
center member 74 forming a part of it fits against the
ring 66 in the manner indicated in the preceding dis
forming a part ‘of this second part 30. This center mem
in such a. manner that a cylindrical surface 72 on a
cussion so as to form a multiple seal around the open
ing 64.
against the sealing ring 24 so as to deform this ring as
It is possible to use a number of other di?erent modi?ed
indicated later in this speci?cation, to form a seal around
the opening 22 at all times. A passage 38 is located in 10 types of trunnions with the dispensing closure of this
invention. In FIG. 7 of the drawing there is shown a
the center member 34 so as to extend from the cylindrical
further modi?ed dispensing closure 80 of this invention
surface 36 out through a spout 40 formed as a part of
which is substantially identical with the closure 50 except
the center member 34.
as herein described. For this reason various parts of
With this construction the spout 4i) normally extends
within the slot 18 when the closure 10 is in a closed 15 the closure 80 which are the same as parts of the closure
50 are designated by the primes of the numerals previously
position. When it is desired to open this closure the
employed. The closure 80 contains semi-spherical trun
spout 40 may be easily rotated with a nominal minimum
ions 82 which are located in the same position within the
amount of pressure until a portion of the center member
closure 80 as the trunnions 62 are located within the clo
34- hits against the top 14. At this point the passage 38
and the opening 22 are aligned with one another. The 20 sure 50. These trunnions 82 are adapted to ?t within
ber 34 has a cylindrical surface 36 which normally ?ts
closure 10 is, of course, closed by reversing the rotation
of the spout 40.
When the second part 30 is snapped into position as
indicated in the preceding discussion the cylindrical sur
correspondingly shaped bearing openings 84 in a second
part 68’ in order to hold this second part so that a seal as
previously described is formed between it and the sealing
ring 66’ around the opening 64' at all times.
In FIG. 8 of the drawing there is shown a further
face 36 of the center member 34 is held through the use 25
modi?ed dispensing closure 90 which is substantially iden
of the axles 32 so as to bear against the sealing ring 24 so
tical to the closure 50 except as hereinafter indicated.
as to deform this sealing ring as indicated in FIG. 4 of
the drawing from its initial con?guration indicated in
For convenience various parts of the closure 90 which are
FIG. 3 of the drawing. When va seal is formed in this
identical or substantially identical to the parts of the clo
manner the sealing ring 24 bears against the surface 36 30 sure 50 are identified by the double primes of the numer
with a uniform amount of pressure at all points along its
als previously used. The closure Q0 includes a ring-like
length or circumference. The force exerted against the
trunnion 92 in the form of a circular ridge having the
sealing ring 24 causes the cylindrical end 20 to deform
same cross-sectional con?guration as the trunnion 62"
so as to create other secondary sealing rings 42 (FIG. 4)
located symmetrically about the trunnion 62". It also
which are parallel to the ring 24 and are substantially 35 includes a corresponding ring-like bearing recess 94 lo
equally spaced from it. These other rings 42 also‘bear
cated around the bearing recess 70". This type of con
against the surface 36 so as to form a seal therewith.
struction is advantageous in obtaining a maximum amount
Thus, with this type of construction in essence a triple
of sealing pressure serving to form a seal around the
seal is formed through the use of one sealing ring.
opening 64" in the ?rst part 52".
Since these three sealing rings contact the surface 36 40
With all the dispensing closures herein described a very
with essentially a line contact very little frictional force
e?icient sealing action is obtained with a minimum of
which would impede rotation of the second part 30, is
developed by these sealing means employed with the in
di?iculty. This sealing action is the result of the second
vention. In order to achieve the results of this invention
the axis of the surface 36 should be coincident with the
axis of the end 20 which, in turn, is the same as the axis
mounted in a substantially rigid manner so as to deform
or rotatable part of the closure as herein de?ned being
a sealing ring as herein indicated.
Further, with these
closures the second or rotatable part is held in a balanced
manner so that an equal amount of force is applied to the
of. the space occupied by the ring 24 in its undeformed
con?guration. Further, the radius of the surface 36
mutually contacting portions of closure where a seal is
should be less than the radius of the end 20 but should
formed. This will be realized from a detailed considera
be greater than the radius of the cylinder around which
tion of the parallel surfaces of revolution on the parts as
50 previously described. Because of the nature of this in
the ring 24 is disposed as previously described.
This same type of sealing action may be achieved in
vention, it is to be considered as being limited only by
a number of other ‘different closure structures. As an
the appended claims forming a part of this description.
example of this there is shown in FIG. 5 a dispensing
I claim:
closure 50 built in the form of a common bottle cap. The
1. A two-part dispensing closure which comprises: a
closure 50 includes a ?rst part 52 which consists of a top
54 attached to an internally threaded dependent skirt 56‘.
The part 52 is formed of a material of the type used in
?rst part formed of a ?exible, resilient material so as to
forming the part 12 previously described; if desired, it
a curved cross-sectional con?guration located around said
have a top, an opening leading through said ?rst part
from said top, and a resilient, ?exible sealing ring having
may be formed as an integral part of the container or
opening, said sealing ring being located in a surface of
may be formed in a known manner so as to be capable 60 revolution, the top of said ring lying in a surface of revolu
of being snapped or popped into place on a container.
With the closure 50 the top 54 is formed so as to
tion concentric with the surface in which it is located; a
second part rotatably mounted on said ?rst part, said sec
have a slot 58 ‘located therein. This slot terminates in a
ond part having a surface of revolution formed thereon,
cylindrical end 60 at the sides of which there are located
said second part being mounted so that the axis of said
opposed generally conical shaped trunnions 62 having
last-mentioned surface of revolution is co-incident with
rounded ends or points. These trunnions 62 having
the axis of said surface of revolution within which said
rounded ends are symmetrically located. with respect to
sealing ring is located, said surface of revolution 011 said
the axis of the end 60 and are aligned with this axis.
second part engaging said sealing rings so as to deform
From the bottom of the end 60 an opening 64 extends
through the top 54- into the interior of the skirt 56; around 70 said sealing ring and said top so as to form a seal around
said opening between said top and said second part, said ~
this opening 64 there is formed an O-ring type of sealing
second part including a passage extending therethrough
ring 66 similar to the ring 24 previously described.
from said surface of revolution thereon, said passage
With this structure a second part 68 which may be
being adapted to be aligned with said opening during
formed of similar material to those used in forming the
part 30 previously described may be snapped into place 75 rotation of said second part,
3,023,939
5
2. A two-part dispensing closure as de?ned in claim 1
wherein said ?rst part is formed so as to include means
for rotatably supporting said second part, and wherein
said second part is rotatably held by said means, and
wherein said means are capable of temporary deformation
so as to allow said second part to be snapped into place
on said ?rst part.
3. A two-part dispensing closure as de?ned in claim 2
wherein said means comprises bearing openings located
6
second part also having a passage extending therethrough
from said cylindrical surface, said ?rst part having a cylin
drical surface located adjacent to and spaced from said
cylindrical surface of said second part, said cylindrical
surfaces being co-axial, said ?rst part having an opening
leading therethrough from the cylindrical surface thereof,
said ?rst part also having a sealing ring which, prior to
the location of said second part with respect to said ?rst
part, is of uniform cross-sectional con?guration and cor
on opposite sides of said opening, and wherein said sec 10 responds in cross-sectional con?guration to the shape of
ond part includes axles located within said bearing open
ll'lgS.
4. A two-part dispensing closure as de?ned in claim 2
one-half of a circle, the top of said sealing ring lying in
a surface of revolution concentric with said cylindrical sur
face of said ?rst part, said sealing ring being located on
wherein said means comprises aligned trunnions upon
said cylindrical surface of said ?rst part so as to extend
said ?rst part and wherein said second part includes bear 15 around said opening, said sealing ring being engaged by
ing means receiving said trunnions.
5. A two-part dispensing closure as de?ned in claim 2
wherein said means comprises aligned trunnions and cir
cular ridges concentric with said trunnions upon said ?rst
part, and wherein said second part includes bearing re~ 20
cesses receiving said trunnions and said ridges.
6. A two-part dispensing closure which includes: first
and second parts, at least said ?rst part being formed of
a ?exible, resilient material, said second part being rotat
ably mounted on said ?rst part so as to be capable of 25
being rotated about an axis, said second part having a
cylindrical surface which is co-axial with said axis, said
said cylindrical surface of said second part so as to be
deformed thereby and so as to form a seal therewith.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,717,726
2,793,795
2,828,895
2,883,091
2,950,033
Mart ________________ __ Sept. 13,
Wilson et a1 ___________ __ May 28,
Mart _________________ __ Apr. 1,
Barravecchia _________ __ Apr. 21,
Henchert ____________ __ Aug. 23,
1955
1957
1958
1959
1960
UNITED STATES PATENT OFFICE
CERTIFICATE OF CORRECTION
Patent No. 3,023,939
March 6, 1962
Henry A. Gustafson
It is hereby certified that error appears in the above numbered pat
ent reqliring correction and that the said Letters Patent should read as
corrected below.
Column 4,
line 69, for "rings" read -- ring —-.
Signed and sealed this 18th day of May 1965.
(SEAL)
Attest:
ERNEST W.
SWIDER
AIM-sting Officer
EDWARD J .
BRENNER
Commissioner of Patents
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