US3773121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction minimized earth boring
Assignee: Tone Boring Co Ltd
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Filing: 1971-10-26
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Granted: 1973-11-20
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Expires: 1991-10-26
Abstract
Abstract Earth boring using a machine having a high speed motor and a plurality of cutters disposed at mechanically balanced positions, said cutters being rotated about their own axes while revolving about a common axis so that the reaction moment acting on a support for said the motor can be substantially minimized.
Inventors
- 👤 N Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:25
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
158 words
A reaction minimized earth boring machine comprising a sun gear mounted on a rotary sleeve rotatable about a central member and driven by a power source through said rotary sleeve; planetary gears engaging with said sun gear so as to rotate and revolve in relation to said sun gear; a first internal gear mounted on a revolution casing around said planetary gears to engage therewith, said revolution casing being rotatable about said central member; a second internal gear mounted on a transmission member around said planetary gears to engage therewith, said transmission member being rotatable about said central member, said first and second internal gears having a small difference in their number of teeth and engaging the same planetary gear; a central gear mounted on said transmission member coaxially to said second internal gear; and further gears respectively mounted on rotary shafts drIving cutters borne rotatably by said revolution casing, said further gears engaging with said central gear.
Claim 2
Dependent Claim
158 words
A reaction minimized earth boring machine comprising a sun gear mounted on a rotary sleeve rotatable about a central member and driven by a power source through said rotary sleeve; planetary gears engaging with said sun gear so as to rotate and revolve in relation to said sun gear; a first internal gear mounted on a revolution casing around said planetary gears to engage therewith, said revolution casing being rotatable about said central member; a second internal gear mounted on a transmission member around said planetary gears to engage therewith, said transmission member being rotatable about said central member, said first and second internal gears having a small difference in their number of teeth and engaging the same planetary gear; a central gear mounted on said transmission member coaxially to said second internal gear; and further gears respectively mounted on rotary shafts drIving cutters borne rotatably by said revolution casing, said further gears engaging with said central gear.
Claim 3
Dependent Claim
36 words
An earth boring machine according to claim 1 wherein the central member comprises an inner pipe and an outer pipe, both pipes being disposed coaxially with each other and extending to a position adjacent the cutters.
Claim 4
Dependent Claim
38 words
An earth boring machine according to claim 2 further comprising water-discharge nozzle means provided on a bracket formed on the revolution casing and connected to the space between the inner and outer pipes at the lower end thereof.
Claim 5
Dependent Claim
95 words
An earth boring machine according to claim 1 wherein the rotary axis of each cutter is forwardly inclined with respect to a vertical line at a small angle; said further gears are supported rotatably on the revolution casing, said further gears being provided with a splined inner peripheral surface; and the rotary shaft of the cutters is borne on said revolution casing with its axis being inclined and is provided with a splined outer peripheral surface engaging with said splined inner peripheral surface, a clearance sufficient for inclining said axis of the cutter being provided.
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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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |