Patent US3770067A successfully refreshed from Google Patents.
US3770067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction counterbalanced earth boring
Assignee: Tone Boring Co Ltd
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Filing: 1971-10-26
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Granted: 1973-11-06
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Expires: 1991-10-26
Abstract
Abstract Earth boring using a machine having a plurality of cutters which are disposed at mechanically balanced positions on a casing coaxial with and rotatable about the center axis of the machine, the output of a motor being divided into two, one output being used to rotate the cutters about their own axes in one direction, the other being used to rotate the casing in the opposite direction, the total torque for rotating the cutters being substantially equal to the torque for rotating the casing whereby the reaction moment required for supporting the machine is negligible.
Inventors
- 👤 N Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:20
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/16; E21B10/00; E21B10/02; E21B10/04; E21B10/08; E21B10/22; E21B10/24; E21B21/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
An earth boring machine comprising a power source secured to a central member, a speed change gear means having a first casing rotatable coaxially with the output shaft of said gear means, two tubular shafts disposed rotatably about and coaxially with said central member, a second revolution casing rotatable about said central member and connected to one of said tubular shafts, a drill bit rotatably supported on said revolution casing about its own axis and connected with the other one of said tubUlar shafts, wherein the directions of the rotation torques of said tubular shafts are opposite to each other and the intensities of the rotation torques thereof are substantially the same.
Claim 2
Dependent Claim
112 words
An earth boring machine comprising a power source secured to a central member, a speed change gear means having a first casing rotatable coaxially with the output shaft of said gear means, two tubular shafts disposed rotatably about and coaxially with said central member, a second revolution casing rotatable about said central member and connected to one of said tubular shafts, a drill bit rotatably supported on said revolution casing about its own axis and connected with the other one of said tubUlar shafts, wherein the directions of the rotation torques of said tubular shafts are opposite to each other and the intensities of the rotation torques thereof are substantially the same.
Claim 3
Dependent Claim
23 words
An earth boring machine according to claim 1 in which a core braker is disposed on said revolution casing at lower end thereof.
Claim 4
Dependent Claim
74 words
An earth boring machine according to claim 1 in which said central member is a double pipe structure comprising inner and outer pipes to form a cylindrical gap between them extending to the lower end portion thereof, through which gap water is fed to nozzle means disposed at the lower end portion of said revolution casing to supply water into the bottom of a bored hole and through which inner pipe slime is exhausted.
Claim 5
Dependent Claim
28 words
An earth boring machine according to claim 1 in which said revolution casing is a sealed casing filled with lubricant oil and provided with liquid pressure balancing means.
Claim 6
Dependent Claim
14 words
An earth boring machine according to claim 1 further comprising a thrust adjusting float.
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |