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| Number | Title | Issue Date |
| 4551050 | Threaded engagement means According to a depicted embodiment thereof, the novel threaded engagement means comprises a drill rod coupling which is centrally bored and threaded to receive threaded drill rods. A stack of apertured discs, however, engages and lines the threaded bore. ... | 11/05/1985 |
| 4413689 | Plural-part earth bit, and an improved bit head therefor According to a depicted embodiment thereof, the novel earth bit comprises a shank having a threaded end and a bit head centrally bored and threaded to receive a shank. A stack of apertured discs, however, is interposed between the threaded bore or cavity ... | 11/08/1983 |
| 3984192 | Drill mount A rotary spindle of a drill mount has a free end provided with a thread whose angle of rise is so selected that its tangent is at least equal to the coefficient of static friction of steel on steel.... | 10/05/1976 |
