Patent US3695572A successfully refreshed from Google Patents.
US3695572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic mold for parts of plastic material
Assignee: Thales Avionics SAS
•
Filing: 1970-07-22
•
Granted: 1972-10-03
•
Expires: 1990-07-22
Abstract
Abstract A mold for objects of plastic material in which a main injection passage has separate passages extending radially therefrom and which open into the mold cavities, and in which a mechanical element sweeps the space located above the ejectors when the mold is open so that the molded parts which may have remained attached to the ejectors are caused to fall, the said mechanical sweeping element being constituted by the sprue formed by the material which fills the injection and which are formed by the material filling lateral passages located substantially in the joint plane of the mold and provided with radial extensions, while the means for ejecting the sprue are so arranged as to impart a movement of rotation about the axis of the sprue to the assembly which is formed by the sprue and the sprue arms.
Inventors
- 👤 Jean Jullien-Davin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:38
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/40; Y; Y10; Y10S; Y10S425/00; Y10S425/051
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
226 words
In a mold for molding plastic objects, a pair of relatively movable mold portions engageable along a joint plane and when engaged along the joint plane being cooperable to provide molding cavities, a main ejection passage in one of the mold portions, separate lateral passages located in the joint plane extending radially from the main passage and communicating with the molding cavities, the molding cavities being offset from the main injection passage, an ejector provided in the other mold portion cooperable with a molding cavity to eject the molded object therefrom when the mold portions are disengaged along the joint plane, each of said lateral passages having an extension projecting outwardly radially beyond a circle on which the ejectors are located, and a helical cavity coaxial with the main injection passage, the helical cavity bounded by surface means for imparting a rotational movement to hardened molded material in the main injection passage around its own axis upon disengagement of the mold portions, so as to cause the rotation of hardened molded material present in the lateral passages and extensions thereof which material is integral with the hardened molded material in the main injection passage the rotation causing the hardened molded material in the lateral passages and extensions thereof to sweep the space above the joint plane and dislodge any molded parts remaining attached to the ejectors.
Claim 2
Dependent Claim
226 words
In a mold for molding plastic objects, a pair of relatively movable mold portions engageable along a joint plane and when engaged along the joint plane being cooperable to provide molding cavities, a main ejection passage in one of the mold portions, separate lateral passages located in the joint plane extending radially from the main passage and communicating with the molding cavities, the molding cavities being offset from the main injection passage, an ejector provided in the other mold portion cooperable with a molding cavity to eject the molded object therefrom when the mold portions are disengaged along the joint plane, each of said lateral passages having an extension projecting outwardly radially beyond a circle on which the ejectors are located, and a helical cavity coaxial with the main injection passage, the helical cavity bounded by surface means for imparting a rotational movement to hardened molded material in the main injection passage around its own axis upon disengagement of the mold portions, so as to cause the rotation of hardened molded material present in the lateral passages and extensions thereof which material is integral with the hardened molded material in the main injection passage the rotation causing the hardened molded material in the lateral passages and extensions thereof to sweep the space above the joint plane and dislodge any molded parts remaining attached to the ejectors.
Claim 3
Dependent Claim
127 words
The mold for molding plastic objects as claimed in claim 1 in which one of said mold portions is stationary, said rotation imparting surface means including a sprue puller ring slidable to a limited extent within the stationary portion to allow the material in the lateral passages to come to a plane located above the stationary portion, a longitudinal key cooperable with the ring and stationary portion to prevent rotational movement of the ring, and a further ejector for separating the sprue in the main injection passage from the ring, said ring having internally a threaded portion with a reversible helical screw thread so that the ejection of the sprue under the thrust exerted by the further ejector impArts rotational movement to the sprue about its axis.
Claim 4
Dependent Claim
143 words
The mold for molding plastic objects as claimed in claim 2 in which the stationary mold portion is provided with an ejector carrier plate, an ejector push plate cooperable with the carrier plate, the ejectors for the molded objects being carried by the carrier plate, the ejectors each having an end level with the joint plane, the further ejector being slidably mounted in the carrier plate, an annular flange on the further ejector located with axial play within a cavity provided in the push plate, the end of the further ejector projecting beyond the face of the push plate to enable an operating member associated with a press to be applied against the push plate so that the further ejector and hence the sprue are moved a distance equal to the extent of the projection and the axial play of the further ejector.
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |