| 摘要 |
1,054,382. Shovel excavators. J. C. BAMFORD (EXCAVATORS) Ltd. Aug. 17, 1965 [Aug. 19, 1964], No. 33828/64. Heading E1F. The dipper stick of a shovel excavator is swingably connected about a horizontal axis to a bracket pivotally mounted about a vertically maintained axis on a vertically swingable king pin-supported boom, which is associated with a parallel link pivotally connected between the king post and bracket for forming a parallelogram linkage for maintaining the pivotal axis between the boom and the bracket vertical for all positions that the boom may occupy in use of the excavator. |
