Patent US3115681A successfully refreshed from Google Patents.
US3115681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluted ram and fluted extruder
Assignee: Borg Warner Corp
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Filing: 1961-06-28
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Granted: 1963-12-31
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Expires: 1981-06-28
Abstract
No abstract record available.
Inventors
- 👤 James W Hendry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:31
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/1775; B29C45/46; B29C45/47; B29C45/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
IN A PLASTIC INJECTION MOLDING MACHINE, HAVING AN INJECTION CYLINDER AND A RECIPROCABLE INJECTION RAM ARRANGED THEREWITHIN, THE IMPROVEMENT COMPRISING: MEANS EFFECTING RECIPROCATION OF SAID RAM WITHIN SAID INJECTION CYLINDER, SAID RAM BEING OTHERWISE NOT POSITIVELY DRIVEN ROTATIVELY, AND MEANS SUPPORTING SAID RAM FOR FREE ROTATION AROUND ITS LONGITUDINAL AXIS AND WITH RESPECT TO SAID INJECTION CYLINDER; A SPIRAL RIDGE ON THE EXTERNAL SURFACE OF SAID RAM TERMINATING RADIALLY IN CLOSE CONFORMITY WITH THE INTERNAL WALL OF SAID INJECTION CYLINDER; WHEREBY WITH EACH INJECTION STROKE, PLASTIC MATERIAL WITHIN THE INJECTION CYLINDER WILL BE FORCED BACK AGAINST AN ADJACENT PORTION OF SAID SPIRAL RIDGE AND THE REACTION PRESSURE OF SAID PLASTIC MATERIAL AGAINST SAID RIDGE WILL EFFECT A ROTATION OF SAID RAM ABOUT ITS LONGITUDINAL AXIS AND SUCH ROTATION WILL MOVE PLASTIC MATERIAL ENTERING BETWEEN SAID RAM AND THE SURROUNDING CYLINDER WALL ALONG SAID RAM AND DISCHARGE IT AT THE REARWARD END THEREOF.
Claim 2
Dependent Claim
152 words
IN A PLASTIC INJECTION MOLDING MACHINE, HAVING AN INJECTION CYLINDER AND A RECIPROCABLE INJECTION RAM ARRANGED THEREWITHIN, THE IMPROVEMENT COMPRISING: MEANS EFFECTING RECIPROCATION OF SAID RAM WITHIN SAID INJECTION CYLINDER, SAID RAM BEING OTHERWISE NOT POSITIVELY DRIVEN ROTATIVELY, AND MEANS SUPPORTING SAID RAM FOR FREE ROTATION AROUND ITS LONGITUDINAL AXIS AND WITH RESPECT TO SAID INJECTION CYLINDER; A SPIRAL RIDGE ON THE EXTERNAL SURFACE OF SAID RAM TERMINATING RADIALLY IN CLOSE CONFORMITY WITH THE INTERNAL WALL OF SAID INJECTION CYLINDER; WHEREBY WITH EACH INJECTION STROKE, PLASTIC MATERIAL WITHIN THE INJECTION CYLINDER WILL BE FORCED BACK AGAINST AN ADJACENT PORTION OF SAID SPIRAL RIDGE AND THE REACTION PRESSURE OF SAID PLASTIC MATERIAL AGAINST SAID RIDGE WILL EFFECT A ROTATION OF SAID RAM ABOUT ITS LONGITUDINAL AXIS AND SUCH ROTATION WILL MOVE PLASTIC MATERIAL ENTERING BETWEEN SAID RAM AND THE SURROUNDING CYLINDER WALL ALONG SAID RAM AND DISCHARGE IT AT THE REARWARD END THEREOF.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-12-30 | 1967-07-01 | 1967-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-30 | 1971-07-01 | 1971-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-30 | 1975-07-01 | 1975-12-31 | $7700.00 | Window Closed / Lapsed |