Patent US3856256A successfully refreshed from Google Patents.
US3856256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection mold for making hollow bodies having a mold locking core
Assignee: Milacron Inc
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Filing: 1973-03-14
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Granted: 1974-12-24
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Expires: 1993-03-14
Abstract
Abstract Apparatus for injection molding hollow bodies open at both ends in a two-part mold adapted to separate at the largest section of the body between the two ends thereof. A two-part core divided along a slanted line is supported in the mold at each end and one part of the core is arranged to be locked to one mold part in the closed position of the mold and to be released therefrom only after the core parts have been separated upon opening of the mold. Separation of the core parts is effected by a lost-motion connection between each of these parts and the other mold part which causes the core parts to be forcibly separated when the mold is opened thereby stripping the molded body from the core.
Inventors
- 👤 L Celesti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:03
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/40; B29C45/44; B29C33/00; B29C33/44; B29C33/48; B29C33/485; B29L; B29L2022/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
188 words
Apparatus for injection molding of open-ended hollow bodies comprising a mold having a parting plane perpendicular to the axis of symmetry of the mold and passing through the largest section of the mold between the two ends thereof so as to divide the mold into an upper part and a lower part, a core disposed within the mold and separated along a plane slanted with respect to the axis of symmetry thereof and dividing said core into a first part having a large base portion and a second part having a small base portion, and means adapted to be actuated by the mating of the core parts for locking the core part having the large base portion to the lower mold part, said locking means including a latch pivoted on said first core part, a groove in said second core part having a slanted bottom portion, and a tail on said latch constructed and arranged for engagement with the bottom portion of said groove for moving said latch to its engaged position when the mold is closed thereby locking said first core part to said lower mold part.
Claim 2
Dependent Claim
188 words
Apparatus for injection molding of open-ended hollow bodies comprising a mold having a parting plane perpendicular to the axis of symmetry of the mold and passing through the largest section of the mold between the two ends thereof so as to divide the mold into an upper part and a lower part, a core disposed within the mold and separated along a plane slanted with respect to the axis of symmetry thereof and dividing said core into a first part having a large base portion and a second part having a small base portion, and means adapted to be actuated by the mating of the core parts for locking the core part having the large base portion to the lower mold part, said locking means including a latch pivoted on said first core part, a groove in said second core part having a slanted bottom portion, and a tail on said latch constructed and arranged for engagement with the bottom portion of said groove for moving said latch to its engaged position when the mold is closed thereby locking said first core part to said lower mold part.
Claim 3
Dependent Claim
28 words
The molding apparatus of claim 1 including resilient means for biasing said latch to its disengaged position when said tail is released upon separation of the core parts.
Claim 4
Dependent Claim
54 words
The molding apparatus of claim 1 including a first lost-motion connection between said upper mold part and said second core part to permit said upper mold part to move through a predetermined distance relative to said second core part before engaging said second core part and moving it away from said first core part.
Claim 5
Dependent Claim
58 words
The molding apparatus of claim 3 including a second lost-motion connection between said upper mold part and said first core part which has greater freedom of movement than said first lost-motion connection and permits separation of said core parts and unlocking of said first corE part before moving said first core part away from said lower mold part.
Claim 6
Dependent Claim
40 words
The molding apparatus of claim 3 including an ejecting member, and lost-motion means connecting said member with said upper mold part for moving said member relative to said core parts prior to the separation thereof upon opening of said mold.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |