Boots – shoes – and leggings
Patent
1981-10-16
1984-05-29
Ruggiero, Joseph F.
Boots, shoes, and leggings
36443102, 417 19, 417 20, G06F 1546
Patent
active
044518935
ABSTRACT:
A control method and a control system for a hydrostatic drive system including a variable displacement hydraulic pump and a hydraulic actuator connected together to form a closed hydraulic fluid circuit. When the flow rate of the hydraulic pump is increased, the rate of change in the tilt of the hydraulic pump is controlled so that the discharge pressure does not exceed a first set of preset values with respect to the flow rate of the pump, meanwhile when the flow rate of the pump is reduced, the rate of change in the tilt of the hydraulic pump is controlled so that the suction pressure does not exceed a second set of preset values with respect to the flow rate of the pump.
REFERENCES:
patent: 3994623 (1976-11-01), Rutshtein et al.
patent: 4108574 (1978-08-01), Bartley et al.
patent: 4164035 (1979-08-01), Glennon et al.
patent: 4218191 (1980-08-01), Stewart
patent: 4227862 (1980-10-01), Andrew et al.
Aoyagi Yukio
Honma Kazuo
Izumi Eiki
Nakajima Kichio
Watanabe Hiroshi
Hitachi Construction Machinery Co. Ltd.
Ruggiero Joseph F.
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