| 摘要 |
A female part intended for top hammer-drilling equipment includes a thread in the form of a ridge in a wall. The ridge is delimited by a crest and two flanks between which a likewise helical groove having a bottom runs. An end the of the groove is defined by a borderline, which separates the groove bottom from a part surface formed in the inside of the wall, the width of which part surface successively decreases in the peripheral direction, and which has a rotationally symmetrical shape essentially similar to the rotationally symmetrical basic shape of the thread. |
