| 摘要 |
PURPOSE: A bolt coupling device having locking structure is provided to obtain a coupling force with a high reliability by eliminating clearance between a pitch and the screw thread of a tap. CONSTITUTION: A bolt coupling device comprises a pair of bolt(10) and nut, wherein each of the bolt and nut has a screw thread(2a) which is partially punched and recessed. Thus, the screw thread has a thickness expanded to correspond to the punched portion, and a maximum friction force is obtained by eliminating clearance between the screw thread of the tap and the pitch. Thus-obtained maximum friction force permits the screw thread of the tap to tightly contact the pitch, and interferes rotation in each direction.
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