Trench excavating and shoring apparatus
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United States of America Patent
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-
Feb 3, 1981
Grant Date -
N/A
app pub date -
Mar 9, 1979
filing date -
Mar 10, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A ditch-digging or trenching machine has a plurality of wall-engaging spreadable and retractable members which can be received in the trench to be advanced and provided with respective fluid-powered cylinders connectible to a cutting head for advancing the latter and drawing the retracted wall-engaging members thereafter to cut the trench. The cutter head includes a milling-type cutter in the form of a worm conveyor adapted to convey the detritus from the trench.
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