| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide the easy contact adjustment by holding a slide plate in a support oscillatable about a pin in parallel with a boom central line fixed to an outer boom, movably toward a contact surface of an inner boom, and providing the support with a movement adjustment means for the slide plate. SOLUTION: A slide plate 27 having the surface shape corresponding to an upper angular shape of an inner boom 2 is provided. A support 23 is formed in a state that it surrounds a surface excluding a sliding surface, of the slide plate 27. The adjustment bolts 25 are fitted in threaded holes of the support 23 and mounted at both sides of a pin 10. Further a plate 26 is located at a rear side of the slide plate 27, and the points of the adjustment bolts 25 are contacted therewith. According to this construction, the contact adjustment of the slide plate 27 to the inner boom after the assembling, can be executed only by fastening the adjustment bolts 25, 25.</p> |
