| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint structure which is easily attachable/detachable, and excellent in durability. SOLUTION: The joint structure B is set up by connecting two independent joint members 1, 2 together in an axial O1 direction. One of the joint members 1 has a first joint portion 4 protruded from a front end thereof in the axial O1 direction, and the first joint portion 4 has at least two external thread portions 6, 9 formed thereon. Each of the thread portions 6, 9 has threads twisting about an axis O1, and one of the external thread portions 9 formed at a location close to the front end of the first joint portion 4 is designated as a front end external thread portion 9, while the other external thread portion 6 formed on one side of the front external thread portion 9 close to a rear end of the first joint portion 4 is designated as a rear end external thread portion 6. The front end external thread portion 9 is smaller in external diameter than the rear end external thread portion 6. On the other hand, the other joint member 2 connected to the one joint member 1 has a second joint portion 17 formed therein, which has two internal thread portions 14, 15, i. e. a front end internal thread portion 14 and a rear end internal thread portion 15 which are screwed onto the front end external thread portion 9 and the rear end external thread portion 6 of the first joint portion 4, respectively. COPYRIGHT: (C)2006,JPO&NCIPI
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