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    • 2. 发明专利
    • Both screw body and the female screw body
    • JP4663813B2
    • 2011-04-06
    • JP2009554410
    • 2009-02-20
    • 裕 道脇
    • 裕 道脇
    • F16H25/24F16B35/00F16B39/12F16B39/30F16H19/04
    • F16B39/30F16B33/006F16B33/02F16B35/00F16B37/00F16B39/12F16B39/26F16B39/282F16B39/32F16B39/38F16B2033/025F16H1/16F16H25/24
    • An object of the present invention is to provide a duplex threaded body having a right-handed thread and a left-handed thread on the circumferential surface of a single solid member. In addition, an object of the present invention is to provide a single-nut or double-nut type internally-threaded body that demonstrates a locking effect even at an intermediate position without substantially loosening by using a combination of a duplex externally-threaded body and one or more internally-threaded bodies. Moreover, an object of the present invention is to provide a screw structure in which a pair of internally-threaded bodies can only be removed by destruction once they are mutually coupled when screwed onto a duplex externally-threaded body, thereby making it possible to impart tamper-proof characteristics in addition to a locking effect. The duplex externally-threaded body of the present invention has, on the outer circumferential surface of a rod-like member, an overlapping region in which a clockwise spiral right-handed thread and a counter-clockwise spiral left-handed thread are provided in at least an overlapping manner. Moreover, the present invention makes it possible to use, alone or in combination, a right-handed internally-threaded body in which a right-handed thread is formed, and a left-handed internally-threaded body in which a left-handed thread is formed, that are screwed onto a duplex externally-threaded body.