Power plants – Pressure fluid source and motor – Cyclically operable reciprocating or oscillating motor or...
Patent
1984-07-23
1987-10-27
Look, Edward K.
Power plants
Pressure fluid source and motor
Cyclically operable reciprocating or oscillating motor or...
60378, 60414, 91189R, 91517, 212250, 294 6823, 414726, F16H 3946
Patent
active
047020768
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.
REFERENCES:
patent: 3238722 (1966-03-01), Berkman et al.
patent: 3479077 (1969-11-01), Martin et al.
patent: 3971215 (1976-07-01), Baron et al.
patent: 4098377 (1978-07-01), Callaghan
patent: 4111783 (1978-09-01), Hastings, Jr.
patent: 4161135 (1979-07-01), Garlinghouse
patent: 4231698 (1980-11-01), Lado
patent: 4546607 (1985-10-01), Kime
Dynamic Hydraulic Systems, Inc.
Look Edward K.
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