| 摘要 |
PROBLEM TO BE SOLVED: To prevent the joining surfaces of two members constituting a lower link 6 from opening. SOLUTION: The lower link 6 is divided into a first member, including a first pin boss part and a second member which includes a second pin boss part along the joining surfaces 24 to form a plane passing the center of a pin hole 23. On the sides of the pin hole 23, a pair of bolts are provided, and the two are fastened rigidly. A rectangular recess 31 is formed at an upper joining surface 24A, and substantial joining surface 24A remains only at the periphery. A bolt hole 32 to admit penetration of a bolt is formed through the center of the recess 31. The lower joining surface 24B is furnished with only a bolt hole 33. Thereby the joining surface 24A at the periphery will have a higher surface contacting pressure, and the two link members will not open.
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