Hydraulically operated clam-shell device
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United States of America Patent
Stats
-
Oct 27, 1987
Issued Date -
N/A
app pub date -
Jul 23, 1984
filing date -
Jan 13, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention contemplates a hydraulically operated twin-cable suspension for a clamshell or the like load-handling device. In a preferred embodiment, a charged accumulator is effectively a counterweight and is the source of all hydraulic fluid needed for the full range of actuation of two traction cylinders, one for each of the respective cables. Both cables automatically share the load, without slack, in any elevational situation, and simple hydraulic control circuitry selectively enables (a) an automated closing dig into loadable material and (b) a quick opening for load discharge. A single power integrator is interposed between the accumulator and the two traction cylinders for directionally controlling hydraulic-fluid displacement between the accumulator and the traction cylinders, as needed for all cable displacements.
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