| 摘要 |
A multiple-chain trenching machine comprises a prime mover with a trenching head assembly operably connected thereto, the head comprising: a) a frame operably connected to the prime mover at a proximal end; b) one or more pairs of proximal and distal primary sprockets mounted on the frame; c) a primary endless-chain digging assembly engaged around each pair of primary sprockets; d) one or more pairs of proximal and distal secondary sprockets mounted on the frame; e) a secondary endless-chain digging assembly engaged around each pair of secondary sprockets. The primary chains are substantially wider than the secondary chains, and trenching head is adapted so that each of the secondary chains produces a relief slot in the leading edge of the trench. The primary chains are driven in a forward chain direction, while the secondary chains may be driven in a forward or a reverse chain direction.
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