Sealing arrangement for the casings of underground motors
Abstract
Abstract THE SEALING ARRANGEMENT MAY INCLUDE A CONVENTIONAL EXTERNAL SEALING DEVICE HAVING ITS INTERIOR IN CONTACT WITH THE LUBRICANT FILLING THE BEARING CHAMBER OF THE MOTOR OF AN UNDERGROUND DRILLING MACHINE, A SPACE ISOLATED FROM THE OUTER ENVIRONMENT BY A SECOND SEAL AND FILLED WITH A PROTECTIVE PRODUCT UNDER A SLIGHTLY GREATER PRESSURE THAN THAT OF THE OUTER ENVIRONMENT. THE PRESSURE ON THE PROTECTIVE PRODUCT IS EFFECTED BY A CASING FITTED WITH A PISTON, ONE SIDE OF THE SPACE DEFINED BY THE PISTON CONSTITUENTS A PART OF THE SPACE FILLED WITH THE PROCTECTIVE PRODUCT, AND THE SPACE ON THE OTHER SIDE OF THE PISTON BEING IN COMMUNICATION WITH THE BORE HOLE AND CONTAINING A SPRING ACTING ON THE PISTON. INSTEAD ON A CONVENTIONAL SEALING DEVICE, THERE MAY BE USED A SEALING DEVICE CAPABLE OF PRESSURING THE LUBRICANT SO THAT IT IS PLACED UNDER A SLIGHTLY GREATER PRESSURE THAN THE PROTECTIVE PRODUCT, THEREBY PREVENTING POSSIBLE CONTAMINATION OF THE LUBRICANT BY THE PROTECTIVE PRODUCT.
Inventors
- 👤 Leonide Dicky
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |