US3591898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding of all-plastic shot shell cases
Assignee: Herter's Inc
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Filing: 1969-09-22
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Granted: 1971-07-13
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Expires: 1989-09-22
Abstract
Abstract The molding of all-plastic shot shell cases wherein the case has a base wall with substantially smooth inside and outside surfaces and the case sidewall which has a smooth interior surface and a smooth or striated or slightly corrugated outer surface is integral therewith; gating the plastic into the mold at the center of the base wall and causing the plastic to flow first to all portions of the periphery of the base wall and then progressively along all portions of the longitudinal case sidewall, the mold ejecting the case by a sleeve bearing against the open end of the case sidewall to loosen the case from the mold core and an ejector pin within the core completing ejection of the case from the cavity.
Inventors
- 👤 Duane S Stenmo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:02
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/40; B29C45/26
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
213 words
A mold assembly for producing all-plastic shot shell cases, a stationary mold assembly including an insert part forming the base wall of the shot shell case and having a nozzle gating plastic centrally of the base wall of the shot shell case being formed, a movable mold assembly to be operated by the ram of the mold press for opening and closing the mold, said movable mold assembly including a core forming the inside of the shot shell case, a cavity mold part encompassing the core and defining the cavity in which the case is formed, the cavity part cooperating with the insert part of the stationary assembly to close the mold, said cavity part including a stripper sleeve encompassing the core in close relation to define the end of the cavity and to form the end edge of the shot shell case sidewall, the cavity part being movable along the core when the mold is open to initiate ejection of the shot shell case from the core as the stripper sleeve slides along the core, the core having a longitudinal central opening through which an ejector pin extends and slides, to remove the case from the cavity part by pushing against the inside of the base wall of the case being formed.
Claim 2
Dependent Claim
213 words
A mold assembly for producing all-plastic shot shell cases, a stationary mold assembly including an insert part forming the base wall of the shot shell case and having a nozzle gating plastic centrally of the base wall of the shot shell case being formed, a movable mold assembly to be operated by the ram of the mold press for opening and closing the mold, said movable mold assembly including a core forming the inside of the shot shell case, a cavity mold part encompassing the core and defining the cavity in which the case is formed, the cavity part cooperating with the insert part of the stationary assembly to close the mold, said cavity part including a stripper sleeve encompassing the core in close relation to define the end of the cavity and to form the end edge of the shot shell case sidewall, the cavity part being movable along the core when the mold is open to initiate ejection of the shot shell case from the core as the stripper sleeve slides along the core, the core having a longitudinal central opening through which an ejector pin extends and slides, to remove the case from the cavity part by pushing against the inside of the base wall of the case being formed.
Claim 3
Dependent Claim
27 words
The invention according to claim 1 and said core and said stripper sleeve having mating tapers engaging each other and retaining the core concentric of the cavity.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |