To prevent a male screw member which regulates the relative movement of a cylindrical body and an insertion body from becoming loosed.

A linking structure 23 includes the cylindrical body 24 extending between a pair of rotary shafts 15 and 21; a pair of insertion bodies 25 inserted from both ends of the cylindrical body 24; a pair of linking sections 26 and 26 for linking the insertion bodies 25 and the rotary shafts 15 and 21; and the male screw member 28, which regulates the relative movement of the cylindrical body 24 and the insertion body 25, by being screwed from the outer peripheral side of the cylindrical body 24. The torque of one rotary shaft 21 is transmitted to the other rotary shaft 15, by linking each of the rotary shafts 15 and 21. A receiving member 29, having a hole 29A in the inside, is inserted into the tip side of the male screw member 28. The inside diameter D1 of the hole 29A, prior to the receiving member 29 being inserted into the male screw member 28, is formed smaller than the outside diameter D2 of the male screw member 28.

COPYRIGHT: (C)2010,JPO&INPIT