To improve workability of rotary support and to secure the design accuracy of the rotary support.
The rotary support structure is formed by inserting a pin shaft 12 into a connection hole 20 formed to a joint plate 18 and the connection holes 32,30 formed to the joint plates 26, 28 and by rotatably connecting the joint plate 18 and the joint plates 26 and 28. Here, the hole diameter is made smaller in the order of the connection hole 32, the connection hole 20, and the connection hole 30. Also, steps of a small diameter part 12A, a middle diameter part 12B, and a large diameter part 12C are provided to the pin shaft 12, and the size of each step is made fittable to the connection holes 32, 20 and 30, respectively. Accordingly, since there is a sufficient clearance when the pin shaft is inserted into the larger connection hole 32 from the small diameter part 12A side of the pin shaft 12, the pin shaft 12 can be inserted without biting.
KUBOTA MASAHARU
YOSHINO AKIO
MOTOI NORIO
OTA YOSHIETSU
TOBISHIMA CONSTRUCT CO LTD
JOETSU KOGYO KK
Kato Kazunori
Katsuichi Nishimoto
Hiroshi Fukuda