US3845994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plain bearing with high load capacity, particularly for boring tools with cutting wheels
Assignee: Creusot Loire SA
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Filing: 1973-04-09
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Granted: 1974-11-05
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Expires: 1993-04-09
Abstract
Abstract A plain bearing with high load capacity for boring tools with cutting wheels has a spindle attached to the body and a rotary cutting wheel mounted on the spindle. A lubricant reservoir supplies lubricant to the bearing surfaces between the spindle and the cutting wheel. The grease contains fine particles of at least one frictional material which is relatively soft compared to the hard materials of the bearing surfaces. The bearing surfaces of the cutting wheel has grooves around its surface with the rear sides of the grooves in the direction of rotation being substantially perpendicular to the bearing surfaces.
Inventors
- 👤 R Trey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:49
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/24; E21B10/246
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
163 words
Plain bearing with high load capacity, for boring tool with cutting wheels including: a tool body which can be connected to a string of rods, at least one spindle rigidly attached to the body and provided with at least one bearing surface, at least one rotary cutting wheel mounted on a spindle provided internally with at least one rubbing surface, a lubricant reservoir supplying grease to the rubbing surfaces, at least one ball-type bearing for immobilizing a cutting wheel on its spindle, the grease containing fine particles of at least one frictional material which is soft relative to the hard materials of the rubbing organs and has good resistance to seizing by insolubility relative to at least one of the said materials, at least one of the cutting wheels having grooves around the whole of at least one rubbing surface, the rear sides of said grooves considered in the direction of rotation of the said organ being substantially perpendicular to the rubbing surface.
Claim 2
Dependent Claim
163 words
Plain bearing with high load capacity, for boring tool with cutting wheels including: a tool body which can be connected to a string of rods, at least one spindle rigidly attached to the body and provided with at least one bearing surface, at least one rotary cutting wheel mounted on a spindle provided internally with at least one rubbing surface, a lubricant reservoir supplying grease to the rubbing surfaces, at least one ball-type bearing for immobilizing a cutting wheel on its spindle, the grease containing fine particles of at least one frictional material which is soft relative to the hard materials of the rubbing organs and has good resistance to seizing by insolubility relative to at least one of the said materials, at least one of the cutting wheels having grooves around the whole of at least one rubbing surface, the rear sides of said grooves considered in the direction of rotation of the said organ being substantially perpendicular to the rubbing surface.
Claim 3
Dependent Claim
49 words
Plain bearing with high load capacity, as described in claim 1, particularly for boring tools with cutting wheels the grease containing at least 15 percent of at least one of the metals selected from the group consisting of germanium, silver, indium, tin, antimony, thallium, lead, bismuth, cadmium and copper.
Claim 4
Dependent Claim
32 words
Plain bearing with high load capacity as described in claim 1 particularly for boring tools the particles having a lamellar structure, the largest dimensions being a few dozen microns at the most.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |