| 摘要 |
The coupling apparatus comprises a first tubular par (305) with a male member extending axially therefrom including a first mating interface surface (361) with a passageway extending from an axially open center of the first tubular part and opening onto the mating interface surface. The tool bit (350, 355) has an axial female bore for receiving the first part therewithin including a second mating interface (360) surface formed within the bore and shaped for receptive complemental facing with the first mating interface surface of the first part upon insertion of the first part into the receptacle, with a recess (370) being formed in the second mating interface surface and communicating with the passageway when the tool bit and the tubular part are engaged with the mating interface surfaces complementally facing one another. The tubular member has at least one axially elongated radially flexible tongue (336) to which the tool bit (350, 355) is secured and protruding through the passageway and into the recess to provide detenting attachment of the tool bit to the tubular member via superelastic radial bias of the tongue (336) induced by radially opposite deformation of the tongue upon passage thereof into the tubular part to reach the passageway.
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