Valve-guide coring tool
Abstract
Abstract THE INVENTION CONTEMPLATES A PORTABLE JIG HAVING MEANS FOR ESTABLISHING A REBORING, REAMING OR CORING AXIS FOR THE VALVE-STEM GUIDE BORE OF A WORE VALVE STRUCTURE, BY PRIME RELIANCE ON SEPARATE CENTERING TECHNIQUES AT BOTH THE SEAT AND ACTUATING ENDS OF THE AXIS OF THE VALVE, TO REESTABLISH THE AXIS OF THE VALVE THROUGH THE CENTER OF THE SEAT, EVEN THOUGH THE WORN-SEAT AXIS AT THE TIME MAY BE SLIGHTLY OFFSET FROM ITS ORIGINAL ORIENTATION. ONCE THE AXIS TO BE CORED HAS BEEN THUS ESTABLISHED, CLAMP MEANS OF THE INVENTION RETAINS THE REFERENCE AND ALSO POSITIONS GUIDE MEANS FOR THE CORING TOOL. AFTER FINISHING THE EXPANDED VALVE-STEM GUIDE BORE, BASED ON THE NEW REFERENCE AXIS, A VALVE-STEM GUIDE INSERT IN INSTALLED, AND THE SEAT IS FINISHMACHINED IN THE CUSTOMARY MANNER, WITH MINIMUM REMOVAL OF SEAT MATERIAL.
Inventors
- 👤 Everett E Reed
- 👤 James S Boynton
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |