Drive assembly for a reciprocating screw extruder
Abstract
Abstract EXTRUDER APPARATUS FOR PLASTICIZING AND EXTRUDING ORGANIC PLASTIC MATERIAL WHICH INCLUDES A DRIVE ASSEMBLY FOR RECIPROCATING AND CONTINUOUSLY ROTATING THE SCREW OF THE EXTRUDER. A HYDRAULIC MOTOR IS PROVIDED FOR TURNING THE SCREW AT THE SPEED OF THE MOTOR. MOUNTED BETWEEN THE SCREW AND THE MOTOR IS A SHOT OR HYDRAULIC CYLINDER WHICH IS CONNECTED AT THE CYLINDER END TO THE ROTARY OUTPUT SHAFT OF THE MOTOR AND AT THE PISTON ROD END TO THE SCREW OF THE EXTRUDER. THE PISTON AND ITS ROD ARE COUPLED FOR CO- ROTATION WITH THE CYLINDER BY A BALL SPLINE ASSEMBLY WHICH ALLOWS FREE AXIAL MOVEMENT BETWEEN THE PISTON AND THE CYLINDER. THE BALL SPLINE ASSEMBLY IS LOCATED WITHIN THE PRESSURE CHAMBER OF THE CYLINDER SO THAT IT IS LUBRICATED BY THE HYDRAULIC FLUID SUPPLIED FOR ACTUATING THE HYDRAULIC CYLINDER. THE HYDRAULIC FLUID FOR THE CYLINDER CAN BE SUPPLIED FROM THE SAME SOURCE THAT IS AVAILABLE FOR OPERATING THE HYDRAULIC MOTOR.
Inventors
- 👤 William E Ziegler
Bibliographic Details
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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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |