| 摘要 |
A trencher has an adjustable depth arbor support mechanism. The depth control mechanism includes a linkage which normally controls the depth of the trench being dug, but which also will allow the arbor to retract from the ground if it hits an obstacle. Preferably, the arbor support mechanism is at least partially counterbalanced by a spring, to allow the arbor to retract without undo force. The trencher has two wheels equidistant on either side of the arbor, and a third steerable wheel at the front of the trencher in line with the arbor. The cutting teeth are mounted to the arbor using a variety of chucks and mounting brackets, so the width of the trench is adjusted by adjusting the chucks and mounting brackets used.
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