Apparatus for manufacturing rubber washer elements
Abstract
Abstract A METHOD AND APPARATUS FOR MANUFACTURING ANNULAR SHAPED RUBBER WASHER ELEMENTS WHEREIN AN UNCURED ELONGATED ANNULAR RUBBER BLANG IS PLACED BETWEEN A PAIR OF COAXIAL MANDRELS WHICH DDFINE AN OPEN-ENDED ANNULAR CHAMBER HAVING CROSS-SECTIONAL DIMENSIONS EQUAL TO THOSE DESIRED IN THE FINISHED WASHER ELEMENTS. PISTON MEANS DISPOSED AT EACH END OF THE CHAMBER FOR COAXIAL MOVEMENT INTO AND OUT OF THE CHAMBER APPLY PRESSURE AGAINST THE END PORTIONS OF THE BLANK IN ORDER TO LONGITUDINALLY COMPRESS AND RADIALLY EXPAND THE BLANK INTO THE FINAL DESIRED DIMENSIONAL CONFIGURATION WHILE IT IS BEING CURED. FOLLOWING CURING, THE ELONGATED ELEMENT IS CUT TRANSVERSELY TO ITS LONGITUDINAL AXIS IS DESIRED WIDTHS TO FORM WASHER ELEMENTS. D R A W I N G
Inventors
- 👤 H Hall
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |