US4064208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding method with automatic fluid treatment of mold cavity
Assignee: Hanning Elektro Werke GmbH and Co KG
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Filing: 1976-05-17
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Granted: 1977-12-20
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Expires: 1996-05-17
Abstract
Abstract Two mold halves together form a mold cavity and one of the mold halves is fitted with a plurality of ejector rods that can be reciprocated so as to push a molded article out of that half. At least some of these ejector rods are formed with throughgoing passages terminating adjacent the inner ends thereof at nozzle openings. Air and a treatment fluid, such as a demolding liquid, can be injected into the mold interior through these rods, the nozzle openings in the ends of the rods being covered during the normal molding operation.
Inventors
- 👤 Michael Hanning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:56
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/83; B22; B22D; B22D17/00; B22D17/20; B22D17/22; B22D17/2236; B29C45/40
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
215 words
A method of molding a synthetic-resin article in a mold cavity defined between a pair of separable mold parts one of which is provided with ejector rods and which is connectable to a source of flowable synthetic-resin material, said method comprising the steps of: a. retracting the ejector rods from said mold cavity so that ends of said rods lie flush with a wall of said cavity in said one of said mold parts; b. injecting synthetic resin into said cavity while said mold parts are closed to form a synthetic-resin article having the shape of said mold cavity; c. separating said mold parts to permit discharge of said article therebetween; d. advancing said rods in said one of said mold parts toward the other of said mold parts whereby said ends of said rods eject said article; e. holding said ends of said ejector rods in spaced relation from walls of both of said mold parts adapted to form said cavity in a closed condition of the mold formed by said mold parts; f. spraying a mold-wall-treating release liquid from said ends of said ejector rods onto said walls of said mold parts by forcing said liquid through said ejector rods; and g. repeating steps (a) to (f) for the molding of successive articles.
Claim 2
Independent Claim
215 words
A method of molding a synthetic-resin article in a mold cavity defined between a pair of separable mold parts one of which is provided with ejector rods and which is connectable to a source of flowable synthetic-resin material, said method comprising the steps of: a. retracting the ejector rods from said mold cavity so that ends of said rods lie flush with a wall of said cavity in said one of said mold parts; b. injecting synthetic resin into said cavity while said mold parts are closed to form a synthetic-resin article having the shape of said mold cavity; c. separating said mold parts to permit discharge of said article therebetween; d. advancing said rods in said one of said mold parts toward the other of said mold parts whereby said ends of said rods eject said article; e. holding said ends of said ejector rods in spaced relation from walls of both of said mold parts adapted to form said cavity in a closed condition of the mold formed by said mold parts; f. spraying a mold-wall-treating release liquid from said ends of said ejector rods onto said walls of said mold parts by forcing said liquid through said ejector rods; and g. repeating steps (a) to (f) for the molding of successive articles.
Claim 3
Dependent Claim
32 words
The method defined in claim 1 wherein, upon ejection of each article, the mold parts are moved relatively together into an at least partially closed position prior to spraying in step (f).
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) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |