Patent US3712787A successfully refreshed from Google Patents.
US3712787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for moulding helmet shells and the like
Assignee: Individual
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Filing: 1971-11-15
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Granted: 1973-01-23
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Expires: 1991-11-15
Abstract
Abstract Injection moulding apparatus for moulding helmet shells forms the shells upon a rigid core from which they are removed by a reciprocable ejector slide provided with a pivotally mounted head for engaging an edge of the shell and fulcruming it upon the opposite edge.
Inventors
- 👤 R Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:14
CPC Classifications
A; A42; A42C; A42C2/00; B; B29; B29C; B29C33/00; B29C33/44; B29C33/442; B29C37/00; B29C37/0003; B29C37/0014; B29C45/00; B29C45/17; B29C45/40; B29C45/44; B29C45/4407; B29L; B29L2031/00; B29L2031/48; B29L2031/4807; B29L2031/4814; B29L2031/4821
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
In injection moulding apparatus for moulding a hollow opensided shell of rounded form; said apparatus comprising a core and separable members defining a mould cavity enclosing said core, the improvement comprising an ejecting mechanism for removing moulded shells from said core following separation of said mould cavity defining members, including an ejector slide mounted for reciprocable movement with respect to said core, an ejector head pivotally mounted on said slide and engageable with an edge of a shell carried on said core, and a shoulder on said core engageable by an opposite edge of a shell carried on said core; whereby, upon reciprocation of said ejector slide, said ejector head will engage a shell carried on said core to fulcrum the same against said shoulder for removal from said core.
Claim 2
Dependent Claim
130 words
In injection moulding apparatus for moulding a hollow opensided shell of rounded form; said apparatus comprising a core and separable members defining a mould cavity enclosing said core, the improvement comprising an ejecting mechanism for removing moulded shells from said core following separation of said mould cavity defining members, including an ejector slide mounted for reciprocable movement with respect to said core, an ejector head pivotally mounted on said slide and engageable with an edge of a shell carried on said core, and a shoulder on said core engageable by an opposite edge of a shell carried on said core; whereby, upon reciprocation of said ejector slide, said ejector head will engage a shell carried on said core to fulcrum the same against said shoulder for removal from said core.
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |