Patent US4392534A successfully refreshed from Google Patents.
US4392534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite nozzle for earth boring and bore enlarging bits
Assignee: TSUKAMOTO SEIKI CO Ltd
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Filing: 1981-08-12
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Granted: 1983-07-12
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Expires: 2001-08-12
Abstract
Abstract A composite nozzle for a drill bit and a bore enlarging bit, the body of the nozzle, which is adapted to discharge water toward rotary cutters, being fabricated from a ceramic. The nozzle has a bottom surface which is provided with a high-impact metal plate, and a circumferential wall portion also provided with a reinforcing plate.
Inventors
- 👤 Eishiro Miida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:17
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/60; E21B10/61; B; B05; B05B; B05B15/00; B05B15/14; B05B15/18; E21B10/08; E21B10/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A complex nozzle for a drill bit and bore enlarging bit of the type having a plurality of rotary cutters provided at the lower end of the bit body, which composite nozzle comprises: a ceramic member in the shape of a water discharge nozzle provided above the rotary cutters; said ceramic member having a mouth, a circumferential wall surrounding said mouth and a bottom surface, said mouth opening through said bottom surface; a reinforcing metal ring fitted around the circumferential wall of said ceramic member to prevent damage thereto; and a reinforcing metal plate having a central aperture overlying said mouth, bonded to said bottom surface so as to completely overlay said bottom surface to provide said ceramic member with impact resistance.
Claim 2
Dependent Claim
122 words
A complex nozzle for a drill bit and bore enlarging bit of the type having a plurality of rotary cutters provided at the lower end of the bit body, which composite nozzle comprises: a ceramic member in the shape of a water discharge nozzle provided above the rotary cutters; said ceramic member having a mouth, a circumferential wall surrounding said mouth and a bottom surface, said mouth opening through said bottom surface; a reinforcing metal ring fitted around the circumferential wall of said ceramic member to prevent damage thereto; and a reinforcing metal plate having a central aperture overlying said mouth, bonded to said bottom surface so as to completely overlay said bottom surface to provide said ceramic member with impact resistance.
References Cited (Backward Citations)
GB763676A
Cited
US2950090A
Cited
US3084751A
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US3189107A
Cited
US3129777A
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US3419220A
Cited
US4019593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-11 | 1987-01-10 | 1987-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-11 | 1991-01-10 | 1991-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-11 | 1995-01-10 | 1995-07-12 | $7700.00 | Window Closed / Lapsed |