US3287766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two plunger injection molding machine
Assignee: Drabert Soehne GmbH and Co
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Filing: 1964-09-16
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Granted: 1966-11-29
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Expires: 1984-09-16
Abstract
No abstract record available.
Inventors
- 👤 Drabert Fred
- 👤 Zwicker Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:39
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/06; B30B15/065; B30B15/067; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/53; B29C45/535; B29C45/26; B29C2045/2683; B29C2045/2687
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
AN INJECTION-MOULDING PRESS TOOL FOR THE INJECTION MOULDING OF ARTICLES OF HARDENABLE MATERIAL, COMPRISING TWO PARTS OF A MOULD, EACH PART BEING FORMED WITH A MOOULD CAVITY, CYLINDER MEANS SECURED TO ONE OF THE SAID MOULD PARTS AND HAVING AT LEAST TWO BORES, AN INJECTION PISTON MEANS SLIDABLE IN EACH BORE, A PISTON ROD FOR ACTUATING THE PISTON MEANS, AND A DEVICE BETWEEN THE SAID PISTON ROD AND THE PISTON MEANS BY WHICH RANDOM DIFFERENCES IN THE PRESSURES WHICH ARISE IN THE BORES OF THE CYLINDER IN THE INTRODUCED MASS OF MATERIAL ARE EQUILIZED BEFORE THE CESSATION OF THE INJECTION PROCESS IN SUCH A MANNER THAT THE SPECIFIC INJECTION PRESSURE IN THE INTERCONNECTED MOULD CAVITIES IS EQUALISED, THE SAID DEVICE COMPRISING A PART-SPHERICAL MEMBER MOUNTED FOR MOVEMENT IN A COMPLEMENTARY RECESS IN THE END OF THE PISTON ROD AND AN ADDITIONAL PART-SPHERICAL MEMBER DISPOSED AT THE END OF EACH PISTON FOR SLIDING ENGAGEMENT IN COMPLEMENTARY RECESSES IN THE SAID PART-SPHERICAL MEMBER, WHEREBY, IN OPERATION, IF ONE OF THE BORES OF THE DOUBLE CYLINDER IS SUPPLIED WITH AN EXCESS QUANTITY OF MOULDING MATERIAL FOR THE MOULD CAVITY AND THE OTHER BORE IS SUPPLIED WITH A RELATIVELY SMALLER QUANTITY OF MOULDING MATERIAL, THE
Claim 2
Dependent Claim
201 words
AN INJECTION-MOULDING PRESS TOOL FOR THE INJECTION MOULDING OF ARTICLES OF HARDENABLE MATERIAL, COMPRISING TWO PARTS OF A MOULD, EACH PART BEING FORMED WITH A MOOULD CAVITY, CYLINDER MEANS SECURED TO ONE OF THE SAID MOULD PARTS AND HAVING AT LEAST TWO BORES, AN INJECTION PISTON MEANS SLIDABLE IN EACH BORE, A PISTON ROD FOR ACTUATING THE PISTON MEANS, AND A DEVICE BETWEEN THE SAID PISTON ROD AND THE PISTON MEANS BY WHICH RANDOM DIFFERENCES IN THE PRESSURES WHICH ARISE IN THE BORES OF THE CYLINDER IN THE INTRODUCED MASS OF MATERIAL ARE EQUILIZED BEFORE THE CESSATION OF THE INJECTION PROCESS IN SUCH A MANNER THAT THE SPECIFIC INJECTION PRESSURE IN THE INTERCONNECTED MOULD CAVITIES IS EQUALISED, THE SAID DEVICE COMPRISING A PART-SPHERICAL MEMBER MOUNTED FOR MOVEMENT IN A COMPLEMENTARY RECESS IN THE END OF THE PISTON ROD AND AN ADDITIONAL PART-SPHERICAL MEMBER DISPOSED AT THE END OF EACH PISTON FOR SLIDING ENGAGEMENT IN COMPLEMENTARY RECESSES IN THE SAID PART-SPHERICAL MEMBER, WHEREBY, IN OPERATION, IF ONE OF THE BORES OF THE DOUBLE CYLINDER IS SUPPLIED WITH AN EXCESS QUANTITY OF MOULDING MATERIAL FOR THE MOULD CAVITY AND THE OTHER BORE IS SUPPLIED WITH A RELATIVELY SMALLER QUANTITY OF MOULDING MATERIAL, THE
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |