| 摘要 |
A pivotal driving tool includes a socket having a non-circular cavity formed by three or more planer side walls, and having an inner retaining ring. A mandrel includes a driving shank having a non-circular cross section defined by three or more curved side walls, for engaging into the non-circular cavity of the socket, to allow the socket to be rotated by the mandrel. The mandrel includes one or more spring biased projections to engage with and to anchor the driving shank to the socket. The mandrel includes a narrowed neck portion to allow the mandrel to be pivoted relative to the socket, and t one or more flat surfaces to engage with the socket, and to solidly anchor the driving shank of the mandrel to the socket.
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