| 摘要 |
PROBLEM TO BE SOLVED: To connect and separate pipes without using a tool so as to be repeatedly usable by providing a pipe having an external thread part at one end part, and a locking member fitted rotatably around the axis of the pipe, adjacently to the external thread part, and providing the locking member with a thread ridge part of the same diameter and pitch as the external thread part. SOLUTION: A pipe 3 is provided with an external thread part 2 at one end part, and a locking member 1 is fitted rotatably around the axis of the pipe 3, adjacently to the external thread part 2. The locking member 1 is provided with a thread ridge part 1a of the same diameter and pitch as the external thread part 2. When the locking member 1 is turned after thread-fastening the external thread part 2 into an internal thread part 5a of a pipe 5 to be a connected object, the thread ridge part 1a enters like a wedge between the thread ridge 2b of the external thread part 2 and the thread groove of the internal thread part 5a. The thread ridge thickness of the external thread is therefore increased substantially, and the thread ridge of the external thread is strongly pressed to the thread groove of the internal thread part 5a, so that friction is increased to obtain a lock state. Both pipes 3, 5 can be easily separated by turning the locking member 1 in a loosening direction.
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