US3738545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sliding plunger dispensing closure
Assignee: Kerr Group Inc
•
Filing: 1971-03-12
•
Granted: 1973-06-12
•
Expires: 1991-03-12
Abstract
Abstract To prevent large increases in the force required to pull a sliding plunger of a dispenser closure to its open position and to prevent cold flowing of an enlarged annular sealing surface on the plunger, the annular sealing surface is located within the confines of a smaller diameter aperture when the plunger is in its closed position and blocking fluid flow. Preferably, the plunger is positively retained against popping up to the open position by a sealing ring which is deflected radially outwardly with insertion of the annular sealing surface therein and which, when deflected, exerts a gripping force on the annular sealing surface of the plunger.
Inventors
- 👤 G Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:13
CPC Classifications
B; B65; B65D; B65D47/00; B65D47/04; B65D47/20; B65D47/24; B65D47/245; B65D47/247
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
337 words
A plastic dispenser closure for a container comprising a molded plastic cap body having an elongated internal chamber, a bottom wall for said chamber formed in said cap body, an uninterrupted continuous wall defining an aperture in said bottom chamber wall for permitting to flow into said chamber from said container, a tubular push-pull plunger of plastic material having an internal fluid passageway and slidably mounted in said internal chamber for vertical movement between an upper open position in which fluid may flow through said aperture in said passageway and a lower closed position in which fluid flow is blocked from flowing through said aperture, an upper enlarged end on said plunger projecting outwardly beyond said cap body for easy gripping by said user to enable the user to pull the plunger to said open position and to push said plunger to said closed position, a centrally downwardly extending plunger projection on the lower end of said plunger aligned for movement into and within said aperture, a shank on said plunger projection having a diameter larger than that of said aperture, a freely deflectable ring formed on the lower side of said bottom chamber wall and projecting downwardly therefrom and having said aperture defining wall thereon, said bottom chamber wall having a predetermined cross-sectional thickness and the downwardly projecting ring adding thereto an additional cross-sectional thickness, said bottom chamber wall being rigid as compared to said deflectable ring, an annular sealing surface on said shank of said plunger projection having a diameter larger than said shank diameter for movement into said freely deflectable ring and into sealing engagement therewith, engageable stop surfaces on said plunger and on said cap body stopping said annular sealing surface from moving through said aperture and cold flowing on a lower shoulder of aperture during upward movement of said plunger to said open position, said plunger projection sealing surface deflecting said ring radially outwardly when in said closed position and said deflected ring gripping and positively retaining said plunger against popping open.
Claim 2
Dependent Claim
337 words
A plastic dispenser closure for a container comprising a molded plastic cap body having an elongated internal chamber, a bottom wall for said chamber formed in said cap body, an uninterrupted continuous wall defining an aperture in said bottom chamber wall for permitting to flow into said chamber from said container, a tubular push-pull plunger of plastic material having an internal fluid passageway and slidably mounted in said internal chamber for vertical movement between an upper open position in which fluid may flow through said aperture in said passageway and a lower closed position in which fluid flow is blocked from flowing through said aperture, an upper enlarged end on said plunger projecting outwardly beyond said cap body for easy gripping by said user to enable the user to pull the plunger to said open position and to push said plunger to said closed position, a centrally downwardly extending plunger projection on the lower end of said plunger aligned for movement into and within said aperture, a shank on said plunger projection having a diameter larger than that of said aperture, a freely deflectable ring formed on the lower side of said bottom chamber wall and projecting downwardly therefrom and having said aperture defining wall thereon, said bottom chamber wall having a predetermined cross-sectional thickness and the downwardly projecting ring adding thereto an additional cross-sectional thickness, said bottom chamber wall being rigid as compared to said deflectable ring, an annular sealing surface on said shank of said plunger projection having a diameter larger than said shank diameter for movement into said freely deflectable ring and into sealing engagement therewith, engageable stop surfaces on said plunger and on said cap body stopping said annular sealing surface from moving through said aperture and cold flowing on a lower shoulder of aperture during upward movement of said plunger to said open position, said plunger projection sealing surface deflecting said ring radially outwardly when in said closed position and said deflected ring gripping and positively retaining said plunger against popping open.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |