| 摘要 |
PCT No. PCT/US96/04532 Sec. 371 Date Dec. 15, 1997 Sec. 102(e) Date Dec. 15, 1997 PCT Filed Apr. 3, 1996 PCT Pub. No. WO96/31682 PCT Pub. Date Oct. 10, 1996A pick holder (110) is frictionally seated via a round cylindrical barrel (112) in a pick box of a continuous miner. A pick is in operation rotationally located in a bore (114). The bore (114), toward a rear thereof, has an internal, inwardly projecting screw thread (30). When the pick has been removed, the pick holder (110) is extracted from the pick box by screwing a screw threaded shank into the screw thread (30), and applying an extracting force via the shank and the interengaged screw threads to the pick holder (110).
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