Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1987-03-16
1988-08-09
Look, Edward K.
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
60372, 60416, 60418, 60464, 91461, F16D 3102
Patent
active
047619546
ABSTRACT:
A battery-operated electric-motor driven hydraulic-lift mechanism for a fork-lift vehicle employs a hydraulic accumulator which serves an intertia-free counterweight function, designedly to the degree that such counterweight action is a direct offset of a predetermined average-load condition, as seen by the hydraulic-lift actuator of the system. Electric-motor drive is utilized for up/down operation of the fork lift, only to the extend needed to displace hydraulic fluid into or out of the "counterweighted" actuator. In some cases, such displacement will call for expending energy to add to or substract from the counterweight action; in other cases, the necessary fluid displacement results in an energy return to the system, i.e., in restoring energy to the battery.
REFERENCES:
patent: 3747351 (1973-07-01), Wilkerson et al.
patent: 3908515 (1975-09-01), Johnson
patent: 3939656 (1976-02-01), Goldfein
patent: 4188787 (1980-02-01), Bromell et al.
patent: 4546607 (1985-10-01), Kime
patent: 4573319 (1986-03-01), Chichester
patent: 4631918 (1986-12-01), Rosman
Dynamic Hydraulic Systems, Inc.
Look Edward K.
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