Method for laying pipe
Abstract
Abstract METHOD FOR LAYING LARGE DIAMETER CONCRETE PIPE IN AN EXCAVATION OF MINIMUM WIDTH WITH MAXIMUM SAFETY PROVIDED FOR THE PERSONNEL LAYING THE PIPE INCLUDES THE STEPS OF DIGGING A PARTIAL TRENCH, INSERTING AN EXCAVATING CAGE THEREIN, COMPLETING THE DITCH AND LOWERING SLIDING INDIVIDUAL CANTILEVERED SHEAR MEMBERS TO REINFORCE THE SIDE WALLS OF THE TRENCH, LAYING THE PIPE AND DIGGING AN ADJACENT PARTIAL TRENCH, RAISING THE SHEAR MEMBERS AND ADVANCING THE CAGE INTO THE ADJACENT PARTIAL TRENCH AND THEN REPEATING THE CYCLE. THE EXCAVATING CAGE IS A RIGID FRAME HAVING A LARGE UNOBSTRCUTED CENTER TO PERMIT COMPLETION OF THE EXCAVATION THEREIN WITH A BACK HOE. THE VERTICALLY SLIDABLE SHEAR MEMBERS ARE RIGIDLY SUPPORTED IN GUIDE SLOTS AND ARE CAPABLE OF WITHSTANDING THE SUBSTANTIAL PRESSURES IN THEIR EXTENDED POSITION WITHOUT BEING CROSS BRACED, AND A REAR SHIELD IS PROVIDED TO PERMIT BACK FILLING OF THE EXCAVATION.
Inventors
- 👤 Lloyd De Weese
- 👤 Marilyn Langston De Weese
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |