Control arrangement

Details Control arrangement Control arrangement

1974-11-25

1976-03-16

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Control relative to independently driven oscillator, speed...

60403, 60448, 60905, 60406, F16H 3946, F15B 2000

Patent

active

039437132

ABSTRACT:
A hoist system employing a hydraulic motor, a variable displacement reversible flow hydraulic pump for supplying hydraulic fluid to the hydraulic motor, and an electric motor employed as a prime mover for the pump has a control arrangement effective for sensing various indicia of operation as, for example, rate of speed of lifting of an associated load, failure of the hoist system power train and the lifting of maximum loads. Within the overall control arrangement means are provided for comparing the actual rate of speed of lifting to the desired or requested rate of speed of lifting with the differential thereof being directed back to the associated mechanism for varying the output displacement of said hydraulic pump for thereby modifying such output displacement in order to achieve zero differential output. Means are also provided for automatically braking the hoist drum in order to prevent the load carried thereby from dropping in the event of a failure of the said power train. Means are also provided for varying the maximum speed of the hoist system with variations in load.

REFERENCES:
patent: 2384962 (1945-09-01), Pohl
patent: 2571480 (1951-10-01), Patterson
patent: 3213763 (1965-10-01), Pearson et al.
patent: 3685290 (1972-08-01), Krusche

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