Extruder crosshead
Abstract
Abstract AN EXTRUDER CROSS HEAD FOR EXTRUDING PLASTIC MATERIAL ONTO A CORE WHICH TRAVELS LONGITUDINALLY THROUGH AN ANNULAR DIE PASSAGE DEFINED BY INNER AND OUTER DIES CHARACTERIZED IN THE PROVISION OF A LEVER ACTUATED MANDREL WHICH IS WEDGED INTO AND RELEASED FROM A TAPERED BORE IN THE CROSSHEAD BODY, AD A LEVER-ACTUATED CORE GUIDE AND INNER DIE SLEEVE WHICH IS LONGITUDINALLY SLIDABLE IN THE MANDREL FOR ADJUSTMENT OF THE INNER DIE WITH RESPECT TO THE OUTER DIE. THE INNER DIE HAS INTERNAL PORTIONS FOR WRENCH ENGAGEMENT TO AVOID MARRING OR DISTORTION OF THE DIE AND CORE GUIDE SURFACES THEREOF DURING ASSEMBLY AND DISASSEMBLY OF THE SLEEVE AND INNER DIE. THE EXTRUDER CROSSHEAD HEREIN ALSO HAS CONTROLLABLE BLEED MEANS OPPOSITE THE LATERAL MATERIAL INLET AND HAS A FLOW EQUALIZER RING AROUND THE TIP OF THE MANDREL WHICH INCLUDES CONCENTRIC AND ECCENTRIC BORE PORTIONS TO EQUALIZE THE FLOW OF MATERIAL THROUGH THE ANNULAR DIE PASSAGE.
Inventors
- 👤 Raymond L Christy
Bibliographic Details
Claims Analysis
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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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |