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| Number | Title | Issue Date |
| 7128171 | Hydrodynamic pump passages for rolling cone drill bit An earth boring bit has rotating cones with two lubricant passages to increase bearing capacity and cause lubricant circulation. A lubricant reservoir in the body supplies lubricant to passages between the cone and bearing pin. A pressure compensator equalizes lubri... | 10/31/2006 |
| 5407016 | Plough A plough having a landslide and tilling mechanism, illustrated as a rotary disc or soil inversion wheel, which is pivotable in relation to the landslide between alternative positions providing for the left-hand or right-hand formation of a furrow, dependi... | 04/18/1995 |
| 4061376 | Rock bit bearing structure A rock bit has a rotary cutter cone journaled on a fixed journal bearing shaft with the radial load being taken by a cylindrical journal bearing. The friction bearing portion of the fixed shaft has a groove extending around the periphery of the shaft. The... | 12/06/1977 |
