Trench rig
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United States of America Patent
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-
Mar 12, 2002
Grant Date -
N/A
app pub date -
Jun 29, 1999
filing date -
Jul 3, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A trench rig (1) for excavating continuous monolithic brattices or bases, presenting a self-propelled crawler truck (2), a chain-driven excavating tool (6) provided with a central column (9) which extends along a working axis (A), and a control unit (8) for the column (9) presenting a fixed gripper (15) in relation to the truck (2) and a mobile gripper (16) in relation to the fixed gripper (15) itself; the two grippers (15, 16) are slidingly coupled to the column (9), and can be selectively engaged to the column (9) itself in order to move the tool (6) along the working axis (A), and are connected to each other by a linear step actuator (17).
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