| 摘要 |
A method of manufacturing a percussion drilling assembly, the method including providing a tubular case having a central axis and a lower end with an inner surface and an outer surface, providing a driver sub having a central axis, an outer surface, and an upper end, providing a annular locking member including an annular body, an inner finger extending radially inward from the body, and a first outer finger extending radially outward from the body, positioning the annular locking member about the driver sub, and threading the upper end of the driver sub to the lower end of the case. The inner surface of the lower end includes internal threads and the outer surface of the lower end includes a groove. The outer surface of the upper end includes external threads and the outer surface axially below the outer includes a groove.
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