Patent US4682660A successfully refreshed from Google Patents.
US4682660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydro-drill with circular impression
Assignee: SOLTANCHE A CORP OF FRANCE
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Filing: 1985-12-12
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Granted: 1987-07-28
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Expires: 2005-12-12
Abstract
Abstract The invention relates to a device for the production of circular boreholes in soil, of the type incorporating a pair of bits driven in rotation in opposite directions, the said bits being equipped with teeth or similar members for breaking up the soil. It comprises a first pair of bits (6) which are equipped with teeth, rotating in opposite directions around two parallel axes, each of these bits having the external shape of a volume of revolution the generatrix of which consists of a circular arc corresponding to the circular cross-section of the borehole which it is intended to dig, and a second pair of bits (7) situated above the first, and the bits (14a,14b) of which have the same structural characteristics as the bits of the first pair but whose axes of rotation are offset relative to the latter.
Inventors
- 👤 Herve Barthelemy
- 👤 Yves Legendre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:06
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/16; E21B4/006
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
187 words
A device for producing generally circular boreholes in the ground comprising a body having an upper and lower pair of bits, a driving means for driving each bit in said pairs of bits in a direction opposite to the direction of rotation of the other bit in said pair said bits having a means for breaking up the soil and wherein said lower pair of bits is capable of rotating in opposite directions by said driving means around two parallel horizontal axes, each of said lower pair of bits having the external shape of a volume of revolution the generatrix of which consists of a circular arc corresponding to the circular cross section of the borehole and wherein said upper pair of bits are above said lower pair of bits and rotate in opposite directions about two parallel horizontal axes which parallel axes are not parallel the axes of said lower pair of bits, each of said upper pair of bits having the external shape of a volume of revolution the generatrix of which consists of a circular arc corresponding to the circular cross-section of the borehole.
Claim 2
Independent Claim
187 words
A device for producing generally circular boreholes in the ground comprising a body having an upper and lower pair of bits, a driving means for driving each bit in said pairs of bits in a direction opposite to the direction of rotation of the other bit in said pair said bits having a means for breaking up the soil and wherein said lower pair of bits is capable of rotating in opposite directions by said driving means around two parallel horizontal axes, each of said lower pair of bits having the external shape of a volume of revolution the generatrix of which consists of a circular arc corresponding to the circular cross section of the borehole and wherein said upper pair of bits are above said lower pair of bits and rotate in opposite directions about two parallel horizontal axes which parallel axes are not parallel the axes of said lower pair of bits, each of said upper pair of bits having the external shape of a volume of revolution the generatrix of which consists of a circular arc corresponding to the circular cross-section of the borehole.
Claim 3
Dependent Claim
30 words
A device according to claim 1 wherein each bit in said pair of bits are disposed on opposite sides of a support member connected to the underpart of the body.
Claim 4
Dependent Claim
24 words
A device according to claim 2 wherein said driving means comprises a motor inside each bit and which is connected to said support member.
Claim 5
Dependent Claim
19 words
A device according to claim 2 wherein said driving means comprises at least one motor located in said body.
Claim 6
Dependent Claim
19 words
A device according to claim 1 wherein said driving means comprises at least one motor located in said body.
Claim 7
Dependent Claim
29 words
A device according to claim 1, 2, 3, 5 or 4 wherein at least one pair of said bits bring the boring debris towards the center of the device.
Claim 8
Independent Claim
28 words
A device according to claims 1, 2, 3, 5 or 4 wherein each bit in at least one pair of bits has the shape of a truncated bullet.
Claim 9
Independent Claim
35 words
A device according to claims 1, 2, 3, 5 or 4 wherein the axes of rotation of said upper pair of bits are perpendicular to the axes of rotation of the lower pair of bits.
Claim 10
Independent Claim
51 words
A device according to claims 1, 2, 3, 5 or 4 wherein said body has a suction orifice connected to at least one pump and located in the region of said lower pair of bits to direct boring debris into a vertical pipe located substantially in the middle of the device.
Claim 11
Dependent Claim
24 words
A device according to claim 9 wherein said body has a second suction orifice located in the region of said upper pair of bits.
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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) | 1990-07-27 | 1991-01-26 | 1991-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-27 | 1995-01-26 | 1995-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-27 | 1999-01-26 | 1999-07-28 | $7700.00 | Window Closed / Lapsed |