CA1185207A - Double-seal, molded plastic screw cap - Google Patents
Double-seal, molded plastic screw capInfo
- Publication number
- CA1185207A CA1185207A CA000417496A CA417496A CA1185207A CA 1185207 A CA1185207 A CA 1185207A CA 000417496 A CA000417496 A CA 000417496A CA 417496 A CA417496 A CA 417496A CA 1185207 A CA1185207 A CA 1185207A
- Authority
- CA
- Canada
- Prior art keywords
- cap
- seal
- side wall
- container
- annular
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Closures For Containers (AREA)
Abstract
ABSTRACT
A double-seal, molded plastic screw cap for use with a solid cosmetic product, consisting of a resil-ient, cup-shaped plastic cap body having internal screw threads, the bottom rim of the body being engageable with an external shoulder of the container to effect a seal therewith. Above the screw threads, the side wall of the body has an inwardly raised, annular sealing bead adapted to slidingly and telescopically engage an outer annular surface of the container neck at the top rim thereof, to effect a second seal. A clearance chamber exists above the sealing bead, into which a portion of the cosmetic product can extend. The clearance chamber is characterized by thin walls, to effect a saving of plastic material. The sealing bead is effective indepen-dent of the exact axial positioning of the cap, and the bottom rim seal of the cap requires that the latter be tightly screwed onto the container. The advantage of the present construction over the devices of the prior art is that an improved seal is effected, while at the same time the overall manufacturing cost is reduced by the maximum extent possible.
A double-seal, molded plastic screw cap for use with a solid cosmetic product, consisting of a resil-ient, cup-shaped plastic cap body having internal screw threads, the bottom rim of the body being engageable with an external shoulder of the container to effect a seal therewith. Above the screw threads, the side wall of the body has an inwardly raised, annular sealing bead adapted to slidingly and telescopically engage an outer annular surface of the container neck at the top rim thereof, to effect a second seal. A clearance chamber exists above the sealing bead, into which a portion of the cosmetic product can extend. The clearance chamber is characterized by thin walls, to effect a saving of plastic material. The sealing bead is effective indepen-dent of the exact axial positioning of the cap, and the bottom rim seal of the cap requires that the latter be tightly screwed onto the container. The advantage of the present construction over the devices of the prior art is that an improved seal is effected, while at the same time the overall manufacturing cost is reduced by the maximum extent possible.
Description
52(~
DOUB~JE-SEAL, MOLD~D PLASTIC SCREW CAP
~his invention relates to plastic screw caps Eor use with small hand held containers, such as are provid-ed to hold and dispense cosmetic products. More particu-larly, the invention relates to such caps wherein a pl~
urality of seals is provided to insure the preservation of the cosmetic product during shipping and storage, extended shelf life, etc.
In the past various t~pes of plastic screw caps having multiple seals have been proposed and produced.
Some of these prior screw caps have involved deformable depending skirts or flangesr whereas others have in-volved plug formations insertable in the neck of the cooperable container. The prior caps have in most cases not only involved complicated mold forms which were ex-pensive, but also required the use of a substantial amount of plastic material in order to effect the de-sired double sealing function. Thus, there was entailed a considerable mold cost and in addition the unit cost per cap was not inconsequential, particularly since the cost of the plastic molding material has now become a factor due to increasing petroleum costsO
Moreover, in many instances, the configuration of the cap did not insure the preservation of the seals if the plastic material thereof deformed by reason of shrinkaye, or adverse environmental ~actors.
The above disadvantages and drawbacks of prior molded plastic screw caps are obviated by the present invention which provides a double-seal molded plastic screw cap for use with a threaded-neck container of the type intended to hold a solid cosmetic product having a ~ `32 ~ ~
volatile ingredient, said screw cap comprising, in com-bination a resilient cup-shaped plastic cap body having an annular side wall integral with a transverse top wall, said side wall having internal screw threads adapted for engagement with the external screw threads of the container neck, said side wall oE the cap body having an annular sealing surface disposed above the internal screw threads and between the latter and the top wall, said sealing surface being slidingly and tele-scopically engageable with the outer annular surface ofthe container neck at the top rim thereof, to provide a first seal therewith, said annular side wall of the cap body having a perfectly flat downwardly-directed annular sealing surface on its bottom edge for abutting engage-ment with a cooperable sboulder of the container neck to provide a second seal therewith, said annular sealing surfaces of the cap being spaced apart a distance equal to the spacing of the outer annular surface and cooper-able shoulder of saicl container, thereby to effect si-
DOUB~JE-SEAL, MOLD~D PLASTIC SCREW CAP
~his invention relates to plastic screw caps Eor use with small hand held containers, such as are provid-ed to hold and dispense cosmetic products. More particu-larly, the invention relates to such caps wherein a pl~
urality of seals is provided to insure the preservation of the cosmetic product during shipping and storage, extended shelf life, etc.
In the past various t~pes of plastic screw caps having multiple seals have been proposed and produced.
Some of these prior screw caps have involved deformable depending skirts or flangesr whereas others have in-volved plug formations insertable in the neck of the cooperable container. The prior caps have in most cases not only involved complicated mold forms which were ex-pensive, but also required the use of a substantial amount of plastic material in order to effect the de-sired double sealing function. Thus, there was entailed a considerable mold cost and in addition the unit cost per cap was not inconsequential, particularly since the cost of the plastic molding material has now become a factor due to increasing petroleum costsO
Moreover, in many instances, the configuration of the cap did not insure the preservation of the seals if the plastic material thereof deformed by reason of shrinkaye, or adverse environmental ~actors.
The above disadvantages and drawbacks of prior molded plastic screw caps are obviated by the present invention which provides a double-seal molded plastic screw cap for use with a threaded-neck container of the type intended to hold a solid cosmetic product having a ~ `32 ~ ~
volatile ingredient, said screw cap comprising, in com-bination a resilient cup-shaped plastic cap body having an annular side wall integral with a transverse top wall, said side wall having internal screw threads adapted for engagement with the external screw threads of the container neck, said side wall oE the cap body having an annular sealing surface disposed above the internal screw threads and between the latter and the top wall, said sealing surface being slidingly and tele-scopically engageable with the outer annular surface ofthe container neck at the top rim thereof, to provide a first seal therewith, said annular side wall of the cap body having a perfectly flat downwardly-directed annular sealing surface on its bottom edge for abutting engage-ment with a cooperable sboulder of the container neck to provide a second seal therewith, said annular sealing surfaces of the cap being spaced apart a distance equal to the spacing of the outer annular surface and cooper-able shoulder of saicl container, thereby to effect si-
2~ multaneous seals therewith, the annular side wall of the~ap extending upward ~o said top wall past the annular sealing surface therein; so as to provide a clearance chamber in which a portion of said cosmetic product can extend and be disposed.
Other features and advantages will hereinafter ap-pear.
In the accompanying drawings:
Fig. 1 is an axial view showing the cap in axial section and the cooperable container in side elevation, with the cap in its double-seal position on the con-tainerO
~s~
Fig. 2 is an exploded view showing the cap in axial section, removed from the container which latter is in side elevation.
Fig. 3 is a fragmentary sectional view, enlarged, of the double seal structure adjoining the screw threads.
Fig. 4 is a view like Fig. 3, but showing the single seal of the prior art, and Fig. ~ is a view partly in axial section and partly in side elevation, of a cap and container representing prior art.
As shown, the screw cap is designated by the nu-meral 10, being adapted for use with a container 11 of generally conventional configuration.
The container 11 has a body portion 12 and a neck portion 14, the latter being provided with a usual type of external screw thread 16. Between the neck portion 14 and the body portion 12, the container has an exterior annular shoulder 18 which is accurately formed to lie in a perfectly flat plane. Above the screw threads 16 the neck portion 14 of the container has an annular, exter-ior, smooth sealing surface 20 located at the top rim or edge 22.
The exterior shoulder 18 and the sealing surface 20 of the container 11 are intended to cooperabe with mat-ing surfaces or portions of the screw cap 10 to effect a reliable double seal.
The container 11 can carry a solid cosmetic product such a deodorant stick ~5 which normally protrudes from the neck portion 14 as shown.
The screw cap 10 is formed in a unique manner to ~ ~5~7 provic!e a firstl sliding seal engageable with the sur-face 20 of the neck 14 and which is independent of pre-cise axial positioning of the cap, and a second seal cooperable with the shoulder 18 of the container to pro-vide a second seal which depends on the screw cap 10 being tightly screwed onto the container.
Also, the screw cap 10 has a clearance chamber 24 above the screw threads and under its transverse top wall 26 to accommodate a portion of the cosmetic product 25, such chamber being characterized by especially thin walls to effect a saving in the material that is re-quired in molding.
The screw cap 10 comprises an annular side wall 28 which is integral with the top wall 26 and which has internal screw threads 30 for engagement with the exter-nal threads 16 of the container neck 14~
The side wall 28 of the cap body has an annular sealing surface comprising an inwardly raised annular bead 32 which is located above the internal screw threads 30 and between the latter and the top wall 26.
The sealing surface or bead 32 is slidingly and teles-copically engageable with the outer annular surface 20 of the container neck adjacent the top rim 22 thereof, to provide a first seal which is independent of the pre-cise axial positioning of the cap.
The annular side wall 28 of the cap body has a per-fectly flat, downwardly-directed annular sealing sur~ace 34 on its bottom edge, for abutting engagement with the cooperable shoulder 18 of the container neck to provide a second seal therewith~
~s~
The annular surfaces 32 and 34 of the cap are spaced apart a distance equal to the spacing of the an-nular surface 20 and shoulder 13 of the container, thereby to effect simultaneous seals therewith. The an-nular side wall of the cap, where it is designated 36, extends upward to the top wall 26 from the annular seal-ing surface 32 so as to provide the clearance chamber 24, in which a portion of the cosmetic product 25 is disposed. The walls of the clearance chamber 24 can be especially thin whereby the inside diameter in the cham-ber 24 is greater than the inside diameter of the seal-ing bead 32. That is, the wall ~hickness of the bead 32 is greater than the wall thickness of the chamber 24 whereby an appreciable saving of plastic material is had.
It will be noted that if the plastic material of the screw cap should shrink slightly to reduce the cap diameter, this will cause the sealing bead 32 to more snugly engage the cooperable sealing surface 20 of the container neck. Thus, the seal at such point is not ad-versely affected.
A polypropylene plastic formulation has been found to be satisfactory for use in molding the present cap, since it has the desired resilience and stiffness, and enables the cap to be readily stripped from the mold without requiring an unscrewing movement.
Figure 5 shows a cap and container according to the prior art. The cap is molded of rigid plastic, and has a sealing shoulder 40 which is abuttingly engageable and sealable with the top surface of the rim of the contain~
er neck 44. The seal depends on the cap being screwed - 5 ~
Z~7 down tightly, and is no-t effective for slightly differ-ent axial positions of the cap on the container as with the present constructionO
The applicant's cap construction can be produced in especially simple, economical-to-fabricate molds while still insuring the preservation of the double seal under various conditions of use.
Also, a minimum quantity of plastic material is required, thus reducing the unit cost to the greatest possible extent.
As noted above, the screw cap is especially reli-able for the intended use in spite of the possibility of slight deformation or shrinkage occurring in the plastic substance. Moreover the use of the screw ca does not require alteration or extensive modification of the co-operable container neckn Variations and modifications are possible without departing from the spirit of the invention.
Other features and advantages will hereinafter ap-pear.
In the accompanying drawings:
Fig. 1 is an axial view showing the cap in axial section and the cooperable container in side elevation, with the cap in its double-seal position on the con-tainerO
~s~
Fig. 2 is an exploded view showing the cap in axial section, removed from the container which latter is in side elevation.
Fig. 3 is a fragmentary sectional view, enlarged, of the double seal structure adjoining the screw threads.
Fig. 4 is a view like Fig. 3, but showing the single seal of the prior art, and Fig. ~ is a view partly in axial section and partly in side elevation, of a cap and container representing prior art.
As shown, the screw cap is designated by the nu-meral 10, being adapted for use with a container 11 of generally conventional configuration.
The container 11 has a body portion 12 and a neck portion 14, the latter being provided with a usual type of external screw thread 16. Between the neck portion 14 and the body portion 12, the container has an exterior annular shoulder 18 which is accurately formed to lie in a perfectly flat plane. Above the screw threads 16 the neck portion 14 of the container has an annular, exter-ior, smooth sealing surface 20 located at the top rim or edge 22.
The exterior shoulder 18 and the sealing surface 20 of the container 11 are intended to cooperabe with mat-ing surfaces or portions of the screw cap 10 to effect a reliable double seal.
The container 11 can carry a solid cosmetic product such a deodorant stick ~5 which normally protrudes from the neck portion 14 as shown.
The screw cap 10 is formed in a unique manner to ~ ~5~7 provic!e a firstl sliding seal engageable with the sur-face 20 of the neck 14 and which is independent of pre-cise axial positioning of the cap, and a second seal cooperable with the shoulder 18 of the container to pro-vide a second seal which depends on the screw cap 10 being tightly screwed onto the container.
Also, the screw cap 10 has a clearance chamber 24 above the screw threads and under its transverse top wall 26 to accommodate a portion of the cosmetic product 25, such chamber being characterized by especially thin walls to effect a saving in the material that is re-quired in molding.
The screw cap 10 comprises an annular side wall 28 which is integral with the top wall 26 and which has internal screw threads 30 for engagement with the exter-nal threads 16 of the container neck 14~
The side wall 28 of the cap body has an annular sealing surface comprising an inwardly raised annular bead 32 which is located above the internal screw threads 30 and between the latter and the top wall 26.
The sealing surface or bead 32 is slidingly and teles-copically engageable with the outer annular surface 20 of the container neck adjacent the top rim 22 thereof, to provide a first seal which is independent of the pre-cise axial positioning of the cap.
The annular side wall 28 of the cap body has a per-fectly flat, downwardly-directed annular sealing sur~ace 34 on its bottom edge, for abutting engagement with the cooperable shoulder 18 of the container neck to provide a second seal therewith~
~s~
The annular surfaces 32 and 34 of the cap are spaced apart a distance equal to the spacing of the an-nular surface 20 and shoulder 13 of the container, thereby to effect simultaneous seals therewith. The an-nular side wall of the cap, where it is designated 36, extends upward to the top wall 26 from the annular seal-ing surface 32 so as to provide the clearance chamber 24, in which a portion of the cosmetic product 25 is disposed. The walls of the clearance chamber 24 can be especially thin whereby the inside diameter in the cham-ber 24 is greater than the inside diameter of the seal-ing bead 32. That is, the wall ~hickness of the bead 32 is greater than the wall thickness of the chamber 24 whereby an appreciable saving of plastic material is had.
It will be noted that if the plastic material of the screw cap should shrink slightly to reduce the cap diameter, this will cause the sealing bead 32 to more snugly engage the cooperable sealing surface 20 of the container neck. Thus, the seal at such point is not ad-versely affected.
A polypropylene plastic formulation has been found to be satisfactory for use in molding the present cap, since it has the desired resilience and stiffness, and enables the cap to be readily stripped from the mold without requiring an unscrewing movement.
Figure 5 shows a cap and container according to the prior art. The cap is molded of rigid plastic, and has a sealing shoulder 40 which is abuttingly engageable and sealable with the top surface of the rim of the contain~
er neck 44. The seal depends on the cap being screwed - 5 ~
Z~7 down tightly, and is no-t effective for slightly differ-ent axial positions of the cap on the container as with the present constructionO
The applicant's cap construction can be produced in especially simple, economical-to-fabricate molds while still insuring the preservation of the double seal under various conditions of use.
Also, a minimum quantity of plastic material is required, thus reducing the unit cost to the greatest possible extent.
As noted above, the screw cap is especially reli-able for the intended use in spite of the possibility of slight deformation or shrinkage occurring in the plastic substance. Moreover the use of the screw ca does not require alteration or extensive modification of the co-operable container neckn Variations and modifications are possible without departing from the spirit of the invention.
Claims (3)
1. A double-seal molded plastic screw cap for use with a threaded-neck container of the type intended to hold a solid cosmetic product having a volatile ingre-dient, said screw cap comprising, in combination a re-silient cup-shaped plastic cap body having an annular side wall integral with a transverse top wall, said side wall having internal screw threads adapted for engage-ment with the external screw threads of the container neck, said side wall of the cap body having an annular sealing surface disposed above the internal screw threads and between the latter and the top wall, said sealing surface being slidingly and telescopically en-gageable with the outer annular surface of the container neck at the top rim thereof, to provide a first seal therewith, said annular side wall of the cap body having a perfectly flat downwardly-directed annular sealing surface on its bottom edge for abutting engagement with a cooperable shoulder of the container neck to provide a second seal therewith, said annular sealing surfaces of the cap being spaced apart a distance equal to the spac-ing of the outer annular surface and cooperable shoulder of said container, thereby to effect simultaneous seals therewith, the annular side wall of the cap extending upward to said top wall past the annular sealing surface therein, so as to provide a clearance chamber in which a portion of said cosmetic product can extend and be dis-posed.
2. A double-seal plastic cap as in claim 1, wherein the inside diameter in said clearance chamber is greater than the inside diameter of the annular sealing surface of the side wall, and the thickness of the side wall at the sealing surface is greater than the wall thickness surrounding the clearance chamber.
3. A double-seal plastic as in claim 2, wherein the annular sealing surface above the internal screw threads comprises a bead which is raised with respect to upper and lower bordering inner surfaces of the side wall of the cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000417496A CA1185207A (en) | 1982-12-10 | 1982-12-10 | Double-seal, molded plastic screw cap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000417496A CA1185207A (en) | 1982-12-10 | 1982-12-10 | Double-seal, molded plastic screw cap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1185207A true CA1185207A (en) | 1985-04-09 |
Family
ID=4124132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000417496A Expired CA1185207A (en) | 1982-12-10 | 1982-12-10 | Double-seal, molded plastic screw cap |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1185207A (en) |
-
1982
- 1982-12-10 CA CA000417496A patent/CA1185207A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |