US4422998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled ejection method for injection molding
Assignee: SORENSEN RESEARCH AND DEVELOPMENT
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Filing: 1982-04-22
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Granted: 1983-12-27
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Expires: 2002-04-22
Abstract
Abstract A method of controlled ejection of a molded product in relation to orientation, speed of ejection and/or sterility is disclosed. The method is not dependent on auxiliary moving parts or vulnerable pins or blades. The molded product is ejected into a substantially enclosed guide conduit where the contours of the conduit substantially are regions of the parting surface and the cavity/ies. The guide conduit may be fairly holeproof, whereby a very fast ejection may be accomplished when the molded product is transported in an air stream in a manner similar to a pneumatic dispatch, not necessarily in a downward direction. The molded product may be kept sterile while it is transported in a stream of sterile air.
Inventors
- 👤 Jens O. Sorensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:38
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/40; Y; Y10; Y10S; Y10S425/00; Y10S425/102
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
181 words
A method of cyclic injection molding of plastic where the mold comprises two parts which are separated by a parting surface and at least one cavity situated internally to the boundaries of the parting surface, and wherein each production cycle comprises the steps of: (a) Combining the two mold parts by moving, in a predetermined direction, the mold parts in relation to each other; (b) Injecting plastic in a fluid state into a cavity situated within the parting surface; (c) Solidifying the injected plastic in the cavity, thereby creating a plastic product; (d) Separating the two mold parts by moving, in a direction opposite to the predetermined direction, said mold parts in relation to each other to create a substantially enclosed guide conduit having contours defined by the regions of the parting surface and the internally positional cavity/ies that are exposed subsequent to separation and leading in a direction substantially perpendicular to said predetermined direction; (e) Ejecting the plastic product into said guide conduit; and (f) Guiding and transporting the ejected product from between the mold parts through the guide conduit.
Claim 2
Independent Claim
181 words
A method of cyclic injection molding of plastic where the mold comprises two parts which are separated by a parting surface and at least one cavity situated internally to the boundaries of the parting surface, and wherein each production cycle comprises the steps of: (a) Combining the two mold parts by moving, in a predetermined direction, the mold parts in relation to each other; (b) Injecting plastic in a fluid state into a cavity situated within the parting surface; (c) Solidifying the injected plastic in the cavity, thereby creating a plastic product; (d) Separating the two mold parts by moving, in a direction opposite to the predetermined direction, said mold parts in relation to each other to create a substantially enclosed guide conduit having contours defined by the regions of the parting surface and the internally positional cavity/ies that are exposed subsequent to separation and leading in a direction substantially perpendicular to said predetermined direction; (e) Ejecting the plastic product into said guide conduit; and (f) Guiding and transporting the ejected product from between the mold parts through the guide conduit.
Claim 3
Dependent Claim
33 words
A method according to claim 1, wherein step (f) comprises the step of: (g) Transporting the ejected product through the guide conduit at an orientation directed by the contours of the guide conduit.
Claim 4
Dependent Claim
23 words
A method according to claim 1, wherein said (a) comprises the step of: (g) Combining the two mold parts in a horizontal direction.
Claim 5
Dependent Claim
29 words
A method according to claim 1 wherein step (e) comprises the step of: (g) Ejecting the plastic product into a guide conduit which leads in a substantially vertical direction.
Claim 6
Dependent Claim
31 words
A method according to claim 1, 2, 3 or 4 wherein step (f) comprises the step of: (h) Transporting the ejected product through the guide conduit with a stream of air.
Claim 7
Dependent Claim
28 words
A method according to claim 5 wherein step (h) comprises the step of: (i) Transporting the ejected product through the guide conduit with a stream of sterile air.
References Cited (Backward Citations)
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US3128499A
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US3634997A
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US3852011A
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US4118168A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |