| 摘要 |
<p>PROBLEM TO BE SOLVED: To mount a stopper mechanism for a spindle without forming an overhanging part for outward movement at a bracket whose shaft is connected so as to make free rotation. SOLUTION: Brackets 44R, 44L vertically-formed on a base which constitutes a swing post, are formed with drilled shaft penetrating holes 45R, 45L passing through a spindle 46. A boss part 47 which has bushes 48 extended from lower boom of a boom, is fitted onto the spindle 46 so as to make free rotation. To provide a stopper means for the spindle 46, a pin penetrating hole 46a is drilled near the edge of one end of the spindle 46 so as to penetrate in the orthogonal direction to the axial line. In the bracket 44L on one side, a bottomed pin inserting hole 52 is drilled to a prescribed position beyond the shaft penetrating hole 45R from the top end. The pin inserting hole 52 is inserted from the entrance part 52a side of the pin inserting hole 52 with the pin inserting part 52 disposed in line with the pin penetrating hole 46a, and a plug 53 is screwed in the entrance part 52a.</p> |
