| 摘要 |
A dirt deflector overtravel mechanism for a digging boom assembly which permits raising and lowering of the dirt deflector when the deflector is impacted by a rock or the like. The dirt deflector is pivotally attached at one end to a frame. A deflector link is pivotally attached at one end to the boom frame and its opposite end supports the dirt deflector. The opposite end of the deflector link is also pivotally attached to an overtravel link which, in turn, is pivotally attached to the deflector such that it remains in close proximity to the deflector under normal conditions. When a large rock or the like is thrown against the dirt deflector by the digging chain, the deflector link and overtravel link move from a scissors-like position to a colinear position which permits the dirt deflector to be displaced thereby preventing breakage or damage to the deflector. After the impact and displacement of the dirt deflector, the deflector will automatically fall back into place under its own weight.
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